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WO2003033370A1 - Sac - Google Patents

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Publication number
WO2003033370A1
WO2003033370A1 PCT/NZ2002/000218 NZ0200218W WO03033370A1 WO 2003033370 A1 WO2003033370 A1 WO 2003033370A1 NZ 0200218 W NZ0200218 W NZ 0200218W WO 03033370 A1 WO03033370 A1 WO 03033370A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
layer
paper
film
kraft paper
Prior art date
Application number
PCT/NZ2002/000218
Other languages
English (en)
Inventor
Abdul Munem Mohammad Daoud Al-Shakarchi
Original Assignee
Carter Holt Harvey Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carter Holt Harvey Limited filed Critical Carter Holt Harvey Limited
Publication of WO2003033370A1 publication Critical patent/WO2003033370A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2150/00—Flexible containers made from sheets or blanks, e.g. from flattened tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0012—Flexible containers made from webs by folding webs longitudinally having their openings facing in the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B31B2160/106—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents obtained from sheets cut from larger sheets or webs before finishing the bag forming operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • This invention relates to packaging and in particular bags used for the packing of powders or granules.
  • Such bags may have an inner plastic pouch, which can be heat sealed once filled with product, surrounded and supported, by an outer bag.
  • the outer bag is formed from multiple layers of paper.
  • the bag may not have a distinct inner pouch and a distinct outer bag.
  • Such bags may be used to pack and transport resins, plastics granules, and in particular food grade materials such as milk powders, casein, powdered cheese, protein products, and a variety of food ingredients.
  • Bags for transporting particulate materials can, whether of a bag within bag form or not may accommodate with different sizes a range of product quantities, eg; 5 to 50 kg.
  • Bags used for the packaging of powders and granules, e.g. resins, casein, milk powder may contain within an inner plastics pouch about 25 kg of product.
  • the transport of these bags involves the stacking of a number of bags on pallets.
  • the bags need to provide protection from atmospheric moisture during storage and need also to provide sufficient tear or burst resistance during transportation and handling.
  • Such bags have an internal pouch made of a plastics material, attached to at least one side of the outer covering, and are manufactured with an open top end, so the pouch can be filled with powder by the insertion of an appropriate nozzle into the pouch.
  • the outer covering is two or more layers of Kraft paper.
  • the plastics pouch can be heat sealed, and the outer covering sealed (typically by adhesives) to enclose the inner pouch and protect it and its contents from leakage or from contamination by dirt, insects, or the like.
  • the present invention consists in a bag formed from a laminate of at least one ply of paper and at least one ply of a polymer film the bag having a factory sealed ("bottom") end (eg; a block bottom, pinch bottom, etc.) and a customer closable mouthed end or a customer useable valved end-
  • a factory sealed (“bottom") end eg; a block bottom, pinch bottom, etc.
  • a customer closable mouthed end or a customer useable valved end Preferably the inside layer is of the or a ply of the polymer film
  • said polymer film is a heat sealable polymer film.
  • the bag is a lie flat bag.
  • the laminated materials of the bag are biodegradable and/or repulpable.
  • the thickness of the polymer layer(s) is from 12 to 75 microns and the paper layer(s) is or collectively is from 90 gsm to 200 gsm.
  • the invention provides a bag having an inner plastics pouch capable of being heat sealed after insertion of powder or granules, and a removable outer protective covering, wherein the removable outer protective covering consists of a single layer of composite material laminate consisting of at least one layer of paper, and at least one layer of at least one polymer film bonded to the paper layer(s). Preferably it is one layer only of the polymer film.
  • the at least one polymeric film layer of the outer protective covering may be or have a plastics material or plastics materials similar, identical or different to that or those of the plastics pouch.
  • the composite material may have more than one layer of paper and more than one layer of polymer, our preferred examples make use of one layer of paper and one layer of polymer film.
  • the paper layer is the outer most layer of the outer protective covering.
  • the polymer film may be the outer most layer with the paper being printed prior to application of the polymer film. In other applications the paper is sandwiched between two polymer film layers.
  • the paper layer can be any suitable paper and of a suitable thickness and strength depending upon the size and intended weight of the bag and the thickness and strength of the polymer film. It is preferred that the paper layer is linerboard or Kraft paper, and optionally may included recycled fibre.
  • this outer paper layer is Kraft paper, and is preferably Kraft paper in the range of 90 gsm - 150 gsm. This layer can be printed. It may also be provided with an anti- slip coating.
  • the polymer layer is in the range of from 12 to 75 microns.
  • the polymer film layer forms the inner surface of the outer protective covering.
  • this polymer layer is an extruded film which is bonded to the Kraft paper during production of the outer most layer prior to assembly of the bag.
  • the polymer film is chosen from the polymer films capable of being bonded to Kraft paper. More preferably the bonding process and the polymer films are chosen so that the composite material can be recycled by separating the paper pulp from the polymer film .
  • the polymer film is biaxially oriented.
  • the polymer film may be chosen from: (a) polyester, (b) nylon, (c) polyethylene, (d) polypropylene, and (e) mixtures of polyethylene and polypropylene.
  • the film is either (a) polyester film or (b) is made up of low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, and different grades of polypropylene, or mixtures of any of the above polyethylene and polypropylene.
  • the film is a mixture of polyethylene and polypropylene.
  • the film has a thickness of between 15 microns and 70 microns.
  • the thickness or weight of the film layer and/or the Kraft paper layer will be modified depending upon the users requirements. However it is preferable that these two layers are bonded together, in such a way that it satisfies the minimum burst strength capable of surviving appropriate drop tests.
  • an industry standard "vertical drop test" for milk powder bags is to drop the filled and sealed bag at ambient temperature and relative humidity conditions from a height of 1.2 metres onto its butt. Such a sealed bag must survive at least two drops of such a butt test without failure of the outer layer or the manufactured sealed end. In addition the product must remain within its pouch intact.
  • an industry standard "side drop test” requires the sealed bags to be dropped, at ambient temperature and relative humidity conditions, such that the bag must survive a total of two drops - one drop test on each side, and preferably survive at least a total of four side drops (with two drops per side), from a height of 1.2 metres without failure of the outer ply or the sealed ends, and with the product remaining in its pouch intact at all times.
  • the invention also encompasses a method of manufacturing such bags together with the appropriate inner pouch attached to at least one side of the outer covering, as will be discussed in more detail below and/or with reference to any one or more of the accompanying drawings of the accompanying drawings.
  • the invention provides a method of filling and sealing such bags.
  • Figure 1 illustrates apparatus for the determination of resistance to water penetration, a solution to be contained by the specimen bag laminate material placed over a filter paper capable of revealing water penetration,
  • Figure 2 is a schematic view of a preferred bag having an inner pouch (not shown) and a single layers of composite covering material,
  • Figure 3 illustrates the outer bag material where the plastics film is on the outside of the bag
  • Figure 4 illustrates the outer bag material, where the plastics film is on the inside of the bag
  • Figure 5 illustrates a gusset tear strip, showing the inside face
  • Figure 6 illustrates a gusset tear strip, showing the outside face
  • Figure 7 shows a gusset handle of the rip type
  • Figure 8 shows a gusset finger tear type
  • Figure 9 shows a gusset double perforation type
  • Figure 10 shows a complete bag showing a block bottom base with its inserted gusset and a valve fillable customer end (eg; suitable for cement),
  • Figure 11 shows in section a structure of a composite material useful in the present invention, there being a polymeric film on the right had side, a Kraft paper layer on the left hand side and an adhesive layer interposed therebetween,
  • Figure 12 shows a still additional variant where there is a Kraft paper layer on each of the outer sides and affixed to each such paper layer by an adhesive layer a single polymeric film, the overall structure providing a composite material sandwich,
  • Figure 13 is an example of a bag useful for dairy powders, there being a polymer on the inside and, by way of example, 125 gsm Kraft paper on the outside,
  • Figure 14 shows a further dairy type bag again with a polymer on the inside but this time with a 98 gsm Kraft paper outer layer
  • Figure 15 is a composite material dairy bag again as an example with a polymer on the outside layer and 125 gsm Kraft paper inner layer,
  • Figure 16 shows an example of a composite material sandwich
  • Figure 17 is a possible configuration for a laminating process for manufacturing a sandwich structure
  • Figure 18 is an alternative laminating process
  • Figure 19 shows a flow diagram of a filling method for bag assemblies of the present invention
  • Figure 20 is a flow diagram schematic of the tubing and bottoming process
  • Figure 21 shows details of a bottoming station.
  • the polymer film may be chosen from (a) polyester [such a polyethylene terephthalate, polytetramethylene terephthalate, polyethylene 2,6-naphthalate, and polyethylene- 1,4-cyclohexylene dimethylene terephthalate, etc.], (b) polyamide [such as nylon 6, nylon 66, etc.], (c) polyethylene, (d) polypropylene, (e) polyvinyl chloride and (e) mixtures of polyethylene and polypropylene, or polyethylene terephthalate/polyethylene, or a blend of polyester and polyamide, such as polyethylene terephthalate and nylon may be employed.
  • polyester such a polyethylene terephthalate, polytetramethylene terephthalate, polyethylene 2,6-naphthalate, and polyethylene- 1,4-cyclohexylene dimethylene terephthalate, etc.
  • polyamide such as nylon 6, nylon 66, etc.
  • polyethylene such as nylon 6, nylon 66, etc.
  • polyethylene
  • Polyester films are preferred for the polymeric film layer/layers of the invention when hot adhesive is required to bond the polymer film to Kraft paper layer, and also because of its physical properties including smoothness, strength, tear resistance and moisture barrier characteristics.
  • polyethylene terephthalate is a preferred polymer film, particular oriented polyethylene terephthalate which has been stretched biaxially.
  • the present invention also encompasses compositions derived from other blends of polymers. These compositions tend to provide compatible or semicompatible blends having good thermomechanical integrity, mechanical properties, and/or melt processability.
  • the film is a mixture of polyethylene and polypropylene [in different percentage ratio from 5 :95 to 95 :5]. When the polyethylene percentage ratio is about 60% the hot adhesive either reduced, or not required due to its bonding ability to Kraft paper (self- bonding).
  • the film has a thickness of from about 12 microns (12 ) to about 75 microns (75 micrometers).
  • Figures 17 and 18 show a couple of process configurations.
  • the inner pouch can be of any suitable plastics material and can be from one or more of the materials mentioned earlier and including the following materials, low density polyethylene, linear low density polyethylene, medium density polyethylene, and resins with gas barrier properties, such as ethylene vinyl alcohol, polyamide (nylon), etc.
  • the process for barrier film production is preferably multilayer blown film extrusion.
  • the forming of a bag of the present invention can be by a procedure shown by way of Figure 19 in which 33 is a de-aireator, 34 is a vibrating conveyor/weighing/fine filling station, 35 is a neck strength stretch station, 36 is a heat sealing zone to seal the inner pouch, 37 (optional) involves scoring wheels to score the inner pouch, 38 is the hot melt adhesive system reactivation, 39 involves folding skis, 35 involves pressure rollers and 36 involves a weight station, metal detection station and warehousing.
  • Figure 20 provides a schematic of tubing station with 37 depicting a roll shaping station, 38 depicts perforating knives, 39 depicts a glue station for cross pasting, 40 is a seam glue station, 41 is a forming station, 42 is a seam hot melt station, 43 is a breaker station, 44 is a pouch heat sealer and 45 is a take off area.
  • the bottoming station is shown as a flow diagram by reference to a feeder 46, an alignment table phase 47, an opening station 48, a hot melt application 49, a tape applicator station 50 (which if desired can be swapped in sequence with 51), 51 is a bottom seeking pasting station, 52 is a bottom patch unit, 53 is a pressing/slat conveyor and 54 is a take off area.
  • stations are not to be taken as meaning that the process to be performed at any such a stage must necessarily involve a stationery web or stationery apparatus. Reference to “station” therefore should be interpreted as meaning a stage of the sequence in the scheme of things irrespective of whether or not it is continuous or continual in its operation.
  • the examples are of composite materials/bags which have proven and/or are believed to provide useful options to users and to satisfy performance requirements.
  • a milk powder bag is formed with an internal polyethylene pouch and an outer protective covering (bag) of a composite material.
  • the outer bag has a pair of broad faces, i.e.; front and back faces, joined by side faces which are joined at top and bottom ends, which bag as a composite material made up from Kraft paper outer layer and a plastic inner layer.
  • the outer layer has a Kraft paper weight in the range from 90 - 150 gm per m 2 , and more preferably 100 to 130 gm per m 2 .
  • the Kraft paper layer provides a soft, shock-absorbing layer.
  • the paper is resistant to tear, and heat.
  • the inner layer is conveniently provided as a polymer film, for instance a polyethylene/polypropylene film, on this Kraft paper.
  • the inner surface of the Kraft paper layer is coated with the adhesive and laminated to the polyethylene/polypropylene film layer.
  • the adhesive may be coated on the polyethylene/polypropylene layer and laminated to the inner surface of the Kraft paper layer.
  • the polyethylene/polypropylene layer provides resistance to tear, and puncture, a gas barrier, and an odour barrier (to protect the product packaged from picking up off-odours). It is also the layer and material used to form hermetic seals through thermal welding (or otherwise) since it forms the inner surface for the bag.
  • the film, or coating plastic "polyethylene/polypropylene" are used herein to describe a number of sealant materials, such as low density polyethylene, linear low density polyethylene, medium density polyethylene and high density polyethylene, and different grades of polypropylene.
  • the paper web (17) forms the outer wall of the bags while the plastic web (18) forms the inner wall.
  • the web (17) consists of Kraft paper only which provides the outer layer of the bags with a weight of 125 gm/m 2 covered on one surface (which becomes the interior of the outer layer) with 15 to 50 gm m 2 of polyethylene/polypropylene mixture film providing a vapour barrier, and tear resistance.
  • the two webs are formed in known manner into a continuous flattened tube.
  • the forming of webs into a continuous multi-layer tube which is then cut to length and the subsequent cutting, creasing and gluing of the end portions of each of the cut lengths so as to form bags are well known operations in paper bag manufacture and can be carried out on automatic machinery.
  • the adhesive (gluing) layer provides secure bonding of the film layer to the Kraft paper layer.
  • the adhesive selection of choice is polyester-urethane, due to its heat and chemical resistance. This adhesive is applied to the film in solution, or to Kraft paper layer. The liquid carrier is driven off using hot air leaving a thin layer of the adhesive. The adhesive is then thermally bonded to the second layer.
  • molten polymer instead of adhesive is used to bond two layers together, may be used to form the milk bag of this example.
  • a web of paper and a web of plastic film are passed into and through the nip of a pair of nip rolls, and layer of molten polymer- impregnating and bonding agent is extruded into the nip between the webs on the entry side of the nip.
  • One or more of the speed of the webs, the temperature of the molten polymer, the pressure or spacing of the rolls at the nip, and the rate of extrusion is or are controlled relative to the porosity and surface characteristics of the paper web such that a substantial portion of the molten polymer impregnates partially into and becomes part of the paper web, and a substantial portion lies outwardly of the surface of the paper web and solidifies to form an enhanced surface.
  • This surface is essentially a new surface, to which the film is bonded and on which it is supported clear of the paper surface.
  • the outer composite bag material made in accordance with Example 1 can be tested as follows:
  • portion A Evaporate the diethyl ether from the extract until the volume is reduced to approximately 10 cm 3 then add 20 cm 3 of the methylated spirit. Boil the mixture under a reflux condenser for (10 ⁇ 1) minutes, cool, add a few drops of phenolphthalein indicator solution, and titrate with 0.1 mol/1 sodium hydroxide solution and record the volume (VI) cm 3. Carry out a blank titration on the reagents and record the volume (V2) cm 3.
  • ml mass of sample, in volume of extract taken, i.e; approx. 10 g.
  • Resin acidity (portion B) Evaporate the diethyl ether from the extract and then add 30 cm 3 of petroleum spirit to the residue. Boil the mixture under a reflux condenser for 30 minutes. After cooling, filter the extract into a separating funnel through a No. 41 Whatman filter paper. Wash the flask and filter paper with petroleum spirit then add the washings to the separating funnel. Wash the petroleum spirit in the separating funnel with three successive quantities of 20 cm 3 of water, then run off the petroleum spirit into a flask.
  • m2 mass of sample in volume of extract taken, i.e; approx. 20 g.
  • the Specimen and filter paper shall be securely clamped between the rubber washers by any suitable method. (Dimensions in millimetres).
  • test pieces 150 ⁇ 5) mm by (25 ⁇ 0.5) mm.
  • test pieces 150 ⁇ 5) mm by (25 ⁇ 0.5) mm.
  • test pieces 150 ⁇ 5) mm by (25 ⁇ 0.5) mm.
  • two of the test pieces with the polyethylene coated surfaces in contact and two pieces with one polyethylene coated surface in contact with an uncoated surface.
  • test pieces heat-sealed with the polyethylene coated surfaces in contact, attach a (150 ⁇ 2) g weight to one unsealed end of the joined strips. Suspend the assembly by the other unsealed end at (60 ⁇ 1)°C for (24 ⁇ 0.25) hours. Report the mean separation of the heat-sealed joints to the nearest millimetre.
  • test pieces heat-sealed with the polyethylene coated surface in contact with the uncoated surface for at least 24 hours.
  • the Joints shall then be broken using a tensile tester. Report the mode of failure of the joints.
  • the paper web (19) forms the outer wall of the bags while the plastic web (20) forms the inner wall.
  • the web 19 consists of Kraft paper only which provides the outer layer of the bags with a weight of 125 gm m 2 coated on one surface (which becomes the interior of the outer layer) with 15 to 50 gm/m 2 of polyethylene/polypropylene mixture providing a vapour barrier, and tear resistance.
  • the two webs are formed in a known manner into a continuous flattened tube.
  • the adhesive (gluing) layer provides secure bonding of the film layer to the Kraft paper layer.
  • the adhesive selection of choice is polyester-urethane, due to its heat and chemical resistance. This adhesive is applied to the film in solution or to the Kraft paper layer. The liquid carrier is driven off using hot air leaving a thin layer of the adhesive. The adhesive is then thermally bonded to the second layer.
  • Other adhesives and other laminating processes are well known in the converting industry and may be useful for the production of the laminated material of the package of this invention. For example a "polymounting-process", where molten polymer instead of adhesive is used to bond two layers together, may be used to form the milk bag of this project.
  • Two webs are used to form a laminate material for use in the manufacture of the bag outer.
  • a paper web (17) is used as the inner substrate layer while a plastic web (18) is secured to the substrate and forms the outermost layer of the laminate. This outermost layer will become the outside surface of the formed bag.
  • the finished bag as shown in Figure 14 has a single wall outer bag surrounding and attached to an inner food grade plastics pouch.
  • the inner plastics pouch is formed as an open topped pouch with a closed heat sealed base, and the pouch is releasable attached to the bag outer by adhesives or the like.
  • adhesives or the like Preferably this is achieved by lightly tacking one side of the pouch to parts of the inner surface of the bag outer by used of a hot melt EVA or similar adhesive, or a Henkel Z 9835TM or Mercaptor Technology EM 186TM or similar adhesive.
  • This adhesive is preferably strong enough to locate and hold the pouch in place during manufacture, transport and filling but allow the pouch to readily detached from bag outer, at the bags destination when the bag outer is removed.
  • the web 17 consists of Kraft paper only, which provides the innermost layer of the bag outer.
  • the Kraft paper is 125 gm/m 2 .
  • This Kraft paper layer can be printed prior to attachment to the plastics web.
  • a transparent layer of a plastics material such as a polyethylene/polypropylene layer the printed surface can be protected against moisture and the plastics layer can protect against ink bleeding or abrading as the bags are handled.
  • the plastics layer is a biaxially oriented transparent or translucent layer of 15 to 50 gm/m 2 of a polyethylene/polypropylene mixture which provides both a vapour barrier, and tear resistance. (This gives a film thickness of 15 microns to 79 microns).
  • the adhesive (gluing) layer provides secure bonding of the film layer to the Kraft paper layer.
  • the adhesive selection of choice is a polyester-urethane, due to its heat and chemical resistance. This adhesive is applied to the film in solution or to the Kraft paper layer. The liquid carrier is driven off using hot air leaving a think layer of the adhesive. The adhesive is then thermally bonded to the second layer as they pass through a nip roller.
  • Other adhesives and other laminating processes are well known in the converting industry and may be useful for the production of the laminated material of the package of this invention. For example a "polymounting-process", where molten polymer instead of adhesive is used to bond two layers together, may be used to form the outer bag material as in Figure 17.
  • the nip roller has a contoured surface (e.g. it may be etched or pitted by a laser or other means) to create a textured surface to the plastic layer to increase the friction between adjacent stacked bags.
  • a contoured surface e.g. it may be etched or pitted by a laser or other means
  • the degree of texture and hence surface roughness may be varied depending upon the thickness and material of the film and the shape and size of the resultant bags.
  • a web of paper and web of polymer plastic film are passed into and through the nip of a pair of nip rolls, and a layer of molten polymer (preferably molten polyethylene) is extruded into the nip between the webs on the entry side of the nip.
  • molten polymer preferably molten polyethylene
  • One or more of the speed of the webs, the temperature of the molten polymer, the pressure or spacing of the rolls at the nip, and the rate of extrusion is or are controlled relative to the porosity and surface characteristics of the paper web such that a substantial portion of the molten polymer impregnates partially into and becomes part of the paper web.
  • a substantial portion lies outwardly of the surface of the paper web and solidifies to form an enhanced surface.
  • This surface is essentially a new surface to which the film is bonded and on which it is supported clear of the paper surface.
  • the resulting laminates of the previous examples can be formed into a continuous flattened tube about an inner plastics pouch.
  • the bag outer is a formed from a single layer of the composite plastics/Kraft laminate.
  • a longitudinal seal is made between the overlapping layers down the length of the seam of the bag (as the seal is made between the Kraft surface contacting the opposite plastics surface.
  • this seal is effected by two lines of adhesive. More preferably one line is a hot melt adhesive (e.g. a blend of EVA) and the second line is formed from a solvent based adhesive where both types of adhesive are adapted to seal the plastics to the Kraft layer.
  • the base of the bag is a block base.
  • the outer bag has a specially designed easy open portion to facilitate the manual opening and removal of the outer bag at its destination.
  • the outer covering of the bag can be folded and cut to length. The steps of cutting, creasing and gluing of the base portions of each of the cut lengths, can all be carried out on automatic machinery.
  • Figure 2 shows a typical bag produced from the material of the examples. It is shown schematically to comprise a bag having a base (21), a main face (22) and a flap (23).
  • the front face (22) of the bag stops at line (25), with the flap (23) of the rear face protruding above the tope of the main face (22).
  • the top of the main face (22) and the inside of the flap (23) may be provided with appropriate fastening means, preferably a heat resealable adhesive (preferably a heat resealable hot melt adhesive) which can be allowed to cure on the bag during manufacture, but which can during the filling of the bag allow the top of the bag to be folded over, and sealed through the application of heat.
  • a heat resealable adhesive preferably a heat resealable hot melt adhesive
  • the top of the bag includes some form of tear stip (28) formed at or close to the fold line of the flap (23) to facilitate opening of the outer bag (20), and separation of the outer bag from the inner pouch (not shown) when the product reaches its destination.
  • tear stip formed at or close to the fold line of the flap (23) to facilitate opening of the outer bag (20), and separation of the outer bag from the inner pouch (not shown) when the product reaches its destination.
  • the outer composite covering material is folded over the pouch, resulting in a longitudinal seam (29) from the folding over of the outer covering material.
  • This seam can be closed by appropriate adhesives and is discussed above.
  • the easy opening feature may involve a tear strip or removable portion situated elsewhere on the bag.
  • a tear strip may be provided along or in associated with the longitudinal seam (29), or may form part of the base of the bag.
  • the polymer film (either polyethylene/polypropylene or polyester) is used as the inside of the bag as shown in Figure 2.
  • the Kraft paper is generally resistant to tearing, and to heat.
  • the inner polymer film layer (polyethylene/polypropylene or polyester) provides additional strength for the Kraft paper, as it is securely bonded thereto, and provides resistance to tearing, to puncturing, provides a gas barrier, and an odour barrier to protect the product packaged in the inner pouch from picking up off odours.
  • the inner polymer film layer is also the layer which can be used to form hermetic seals through heat sealing (or otherwise) since if forms the inner surface of the bag.
  • the material of example 3 can be used to form a bag with a plastics outer layer.
  • the inner pouch is formed of a plastics material such as HDPE (with or without special barrier layers) having a lower melting point or sealing point than the inner most film of the outer Kraft paper bag as it is desirable that heat sealing of the inner pouch, once the pouch has been filled, is effected through the use of heat sealing bars applied to the outer Kraft paper bag so the heat is transmitted through to the inner pouch.
  • a plastics material such as HDPE (with or without special barrier layers) having a lower melting point or sealing point than the inner most film of the outer Kraft paper bag as it is desirable that heat sealing of the inner pouch, once the pouch has been filled, is effected through the use of heat sealing bars applied to the outer Kraft paper bag so the heat is transmitted through to the inner pouch.
  • a anti-sealing coating, or layer of material which will prevent adhesion between the inner pouch and the inner-most film of the outer Kraft paper at the point where heat sealing will take place.
  • a milk powder bag (Figure 13) is formed with an internal polyethylene pouch and an outer protective covering (bag) of a composite material.
  • the outer bag has a pair of broad faces, i.e. front and back faces, joined by side faces which are joined at top and bottom ends, which bag has a composite material made up from Kraft paper outer layer and a plastic inner layer.
  • the outer layer has a Kraft paper weight in the range from 90 - 200 gm per m 2 .
  • the outer layer has a Kraft paper weight of 125 gm per m 2 .
  • the Kraft paper layer provides a soft, shock-absorbing layer.
  • the paper is resistant to tear, and heat.
  • the inner layer is conveniently provided as a polymer film, for instance a polyethylene/polypropylene film, on this Kraft paper.
  • the inner surface of the Kraft paper layer is coated with the adhesive and laminated to the polyethylene/polypropylene film layer.
  • the adhesive may be coated on the polyethylene/polypropylene layer and laminated to the inner surface of the Kraft paper layer.
  • the polyethylene/polypropylene layer provides tear and puncture resistance, a gas barrier, and an odour barrier (to protect the product packaged from picking up off-odours). It is also the layer and material used to form hermetic seals through thermal welding (or otherwise) since if forms the inner surface for the bag.
  • the film, or coating plastic "polyethylene/polypropylene" are used herein to describe a number of sealant materials, such as low density polyethylene, linear low density polyethylene, medium density polyethylene and high density polyethylene, and different grades of polypropylene.
  • paper web (55) forms the outer wall of the bags while the plastic web (56) forms the inner wall ( Figure 11).
  • the web (55) consists of Kraft paper only which provides the outer layer of the bags with a weight of 125 gm/m 2 covered on one surface (which becomes the interior of the outer layer) with 15 to 50 gm/m 2 of polyethylene/polypropylene mixture film providing a vapour barrier, and tear resistance.
  • the two webs are formed in known manner into a continuous flattened tube.
  • the forming of webs into a continuous multi-layer tube which is then cut to length and the subsequent cutting, creasing and gluing of the end portions of each of the cut lengths so as to form bags are well known operations in paper bag manufacture and can be carried out on automatic machinery.
  • the adhesive (gluing) layer (57) provides secure bonding of the film layer to the Kraft paper layer ( Figure 11).
  • the adhesive selection of choice is polyester-urethane, due to its heat and chemical resistance. This adhesive is applied to the film in solution, or to Kraft paper layer. The liquid carrier is driven off using hot air leaving a thin layer of the adhesive. The adhesive is then thermally bonded to the second layer.
  • a "polymounting-process” where molten polymer instead of adhesive is used to bond two layers together, may be used to form the milk bag of this project.
  • a web of paper and a web of plastic film are passed into and through the nip of a pair of nip rolls, and a layer of molten polymer-impregnating and bonding agent is extruded into the nip between the webs on the entry side of the nip.
  • One or more of the speed of the webs, the temperature of the molten polymer, the pressure or spacing of the rolls at the nip, and the rate of extrusion is or are controlled relative to the porosity and surface characteristics of the paper web such that a substantial portion of the molten polymer impregnates partially into and becomes part of the paper web, and a substantial portion lies outwardly of the surface of the paper web and solidifies to form an enhanced surface.
  • This surface is essentially a new surface, to which the film is bonded and on which it is supported clear of the paper surface.
  • the inner pouch will be tacked to perhaps one side of the inside of the outer laminated plastics/Kraft paper bag (by a suitable adhesive such as "spots" of a hot-melt adhesive), the outer laminated plastics/Kraft paper bag can be readily removable from the inner pouch at the products destination, so that the outer covering and any dirt associated therewith can be removed before the product in its sealed inner pouch is opened in an appropriate hopper to release is contents.
  • Figures 5 and 6 show the inside and outside faces of a gusset type tear strip formed on the base of the bag.
  • Figure 7 shows a gusset with a handle-rip type on the base of the bag.
  • Figure 8 shows a gusset with a finger tear type on the base of the bag.
  • Figure 9 shows a gusset with a double perforation for the base of the bag.
  • Figure 10 illustrates a schematic view of a completed bag showing its block bottom base with its inserted gusset and a valved customer end (eg; that which self seals when filling with, for example, cement is complete.
  • a milk powder bag is formed with an internal polyolefin polymer pouch and an outer protective covering (bag) of a composite material (Figure 14).
  • the outer bag has a pair of broad faces, ie; front and back faces, joined by side faces which are joined at top and bottom ends, which bag has a composite materials made up from Kraft paper outer layer and a biodegradable plastic inner layer.
  • the outer layer has a Kraft paper weight in the range from 90 - 200 gm per m 2 .
  • the outer layer has a Kraft paper weight of 98 gm per m 2 .
  • the Kraft paper layer provides a soft, shock-absorbing layer.
  • the paper is resistant to tear, and heat.
  • the inner layer is conveniently provided as a polymer film, for instance a Cargill Dow EcoPLA® a polylactic acid polymer, or DuPont Biomax® hydro/biodegradable polyester (proprietary aliphatic polyesters).
  • the inner surface of the Kraft paper layer is coated with the adhesive and laminated to the biodegradable polyester film layer.
  • the adhesive may be coated on the biodegradable polyester film layer and laminated to the inner surface of the Kraft paper layer ( Figure 11).
  • the biodegradable polyester layer provides puncture and tear resistance, a gas barrier, and an odour barrier (to protect the product packaged from picking up off-odours). It is also the layer and material used to form hermetic seals through thermal welding (or otherwise) since it forms the inner surface for the bag.
  • the film, or coating plastic "biodegradable polymers” are used herein to describe a number of sealant materials, such as:
  • BASF Ecoflex® is an aliphatic-aromatic copolyester.
  • DuPont Biomax® hydro/biodegradable polyester (proprietary aliphatic polyesters). New family or highly versatile polymers based on polyethylene terephthalate (PET) technology.
  • Cargill Dow's NatureWorks® PLA (PLA Polymer 4041D] is made from the lactic acid fermented from corn starch.
  • Eastman Eastar Bio® is a copolyester based on terephthalic acid and ethylene glycol.
  • the paper web (55) forms the outer wall of the bags while the plastic web (56) forms the inner wall.
  • the web (55) consists of Kraft paper only which provides the outer layer of the bags with a weight of 98 gm/m 2 covered on one surface (which becomes the interior of the outer layer) with 15 to 50 gm/m 2 of biodegradable polyester, or polyesters mixture film providing a vapour barrier, and tear resistance.
  • the two webs are formed in known manner into a continuous flattened tube.
  • the forming of webs into a continuous multi-layer tube which is then cut to length and the subsequent cutting, creasing and gluing of the end portions of each of the cut lengths so as to form bags are well known operations in paper bag manufacture and can be carried out on automatic machinery.
  • Example 9
  • a milk powder bag is formed with an internal polyethylene pouch and an outer protective covering (bag) of a composite material of sandwich construction (Figure 6).
  • the outer bag has a pair of broad faces, ie; front and back faces, joined by side faces which are joined at top and bottom ends, which bag as a composite material made up from Kraft paper inner and outer layers and a polymeric internal layer.
  • the outer and inner layer has a Kraft paper weight in the range from 20 - 90 gm per m 2 .
  • the outer Kraft paper weight is 40 gm per m 2
  • the inner Kraft paper weight is 90 gm per m 2 ( Figure 12).
  • the Kraft paper provides shock-absorbing attributes.
  • the paper is resistant to tear, and heat.
  • the internal layer is conveniently provided as a polymer film, for instance a polyethylene/polypropylene film, between the layers of Kraft paper.
  • the inner surface of the Kraft paper layers are coated with the adhesive and laminated to the polyethylene/polypropylene film layer.
  • the adhesive may be coated on both sides of the polyethylene/polypropylene layer and laminated to the inner surface of the Kraft paper layers.
  • the polyethylene/polypropylene layer provides tear and puncture resistance, a gas barrier, and an odour barrier (to protect the product packaged from picking up off-odours).
  • polyethylene/polypropylene are used herein to describe a number of sealant materials, such as low density polyethylene, linear low density polyethylene, medium density polyethylene and high density polyethylene, and different grades of polypropylene.
  • Paper webs (60 and 59) form the inner and outer wall of the composite bag material while the plastic web (61) forms the internal layer ( Figure 12).
  • the webs (60 and 59) consist of Kraft paper only which provides the inner and outer layer of the bags with a weight of 40 and 90 gm/m 2 respectively.
  • the internal layer (61) is 15 to 50 gm/m 2 of biodegradable polyester, or polyesters mixture film providing a vapour barrier, and tear resistance.
  • the three webs are formed in know manner into a continuous flattened tube.
  • the forming of webs into a continuous multi-layer tube which is then cut to length and the subsequent cutting, creasing and gluing of the end portions of each of the cut lengths so as to form bags are well know operations in paper bag manufacture and can be carried out on automatic machinery.
  • the adhesive (gluing) layer (62) and layer (63) provides secure bonding of the film layer to the Kraft paper layer.
  • the adhesive selection of choice is polyester-urethane, due to its heat and chemical resistance. This adhesive is applied to the film in solution, or to Kraft paper layer.
  • the liquid carrier is driven off using hot air leaving a thin layer of the adhesive.
  • the adhesive is then thermally bonded to the second layer.
  • a milk powder bag is formed with an internal polyolefin polymer pouch and an outer protective covering (bag) of a composite material of sandwich construction (Figure 16).
  • the outer bag has a pair of broad faces, ie; front and back faces, joined by the side faces which are joined at top and bottom ends, which bag as a composite materials made up from Kraft paper inner and outer layers and a biodegradable plastic internal layer.
  • the outer and inner layer has a Kraft paper weight in the range from 20 - 90 gm per m 2 .
  • the outer Kraft paper weight is 40 gm per m 2
  • the inner Kraft paper weight is 90 gm per m 2 .
  • the Kraft paper provides shock-absorbing attributes.
  • the paper is resistant to tear, and heat.
  • the internal layer is conveniently provided as a polymer film, for instance a Cargill Dow ExoPLA® a polylactic acid film, or DuPont Biomax® hydro/biodegradable polyester (proprietary aliphatic polyesters) between the layers of Kraft paper.
  • the inner surface of the Kraft paper layer is coated with the adhesive and laminated to the biodegradable polyester film layer.
  • the adhesive may be coated on the biodegradable polyester film layer and laminated to the inner surfaces of the Kraft paper layers ( Figure 12).
  • the biodegradable polyester layer provides puncture and tear resistance, a gas barrier, and an odour barrier (to protect the product packaged from picking up off-odours). It is also the layer and material used to form hermetic seals through thermal welding (or otherwise) since it forms the inner surface for the bag.
  • the film, or coating plastic "biodegradable polymers” are used herein to describe a number of sealant materials, as in Example 8.
  • Paper webs (60 and 59) form the inner and outer wall of the composite bag material while the plastic web (61) forms the internal layer.
  • the webs (60 and 59) consists of Kraft paper only which provides the inner and outer layer of the bags with a weight of 40 and 70 gm/m 2 respectively.
  • the internal layer (61) is 15 to 50 gm/m 2 of biodegradable polyester, or polyesters mixture film providing a vapour barrier, and tear resistance.
  • the three webs are formed in known manner into a continuous flattened tube.
  • the forming of webs into a continuous multi-layer tube which is then cut to length and the subsequent cutting, creasing and gluing of the end portions of each of the cut lengths so as to form bags are well known operations in paper bag manufacture and can be carried out on automatic machinery.
  • a milk powder bag is formed with an internal polyolefin polymer pouch and an outer protective covering (bag) of a composite material (Figure 11).
  • the outer bag has a pair of broad faces, ie. front and back faces, joined by side faces which are joined at top and bottom ends, which bag has a composite materials made up from Kraft paper inner and a compostable plastic internal layer.
  • the outer Kraft paper weight is in the range from 90 - 200 gm per m 2 . In our example the outer Kraft paper weight is 125 gm per m 2.
  • the Kraft paper provides shock-absorbing attributes. In addition, the paper is resistant to tear, and heat.
  • the internal layer is conveniently provided as a polymer film, for instance polyester that has been treated with an additive. In our example the additive is TDP AO manufactured by EPI Environmental Products Inc, USA.
  • the inner surface of the Kraft paper layer is coated with the adhesive and laminated to the degradable polyester film layer.
  • the adhesive may be coated on the degradable polyester film layer and laminated to the inner surfaces of the Kraft paper layers.
  • the degradable polyester layer provides puncture and tear resistance, a gas barrier, and an odour barrier (to protect the product packaged from picking up off-odours).
  • Paper web (1) (Figure 17) forms the outer wall of the composite bag material while the degradable polymer, web (2) forms the internal layer
  • the internal layer is 15 to 50 gm/m 2 of degradable polyester, or polyesters mixture film providing a vapour barrier, and tear resistance.
  • the three webs are formed in known manner into a continuous flattened tube.
  • the forming of webs into a continuous multi-layer tube which is then cut to length and the subsequent cutting, creasing and gluing of the end portions of each of the cut lengths so as to form bags are well known operations in paper bag manufacture and can be carried out on automatic machinery.
  • tests on sample bags having a single layer outer formed from a laminate having a substrate if 125 gsm Kraft paper and an outer layer of 15 gsm polymer film (comprising a mixture of polyethylene and polypropylene) and an inner 65 micron HDPE polyethylene pouch confirm that the bags exhibit toughness and tear resistance when both wet and dry and have good vapour barrier properties.
  • sample bags satisfy the drop tests mentioned above even thought they have only a single outer laminate layer.
  • the sample bags were tested and survived : (a) the industry standard "vertical drop test” for milk powder bags were the filled and sealed bag (at ambient temperature and relative humidity conditions) was repeatedly dropped from a height of 1.2 metres onto its butt without damage; and (b) the "side drop test” which requires the sealed bags to be dropped, at ambient temperature and relative humidity conditions, such that the bag must survive a total of two drops - one drop test on each side, and preferably survive at least a total of four side drops (with two drops per side), from a height of 1.2 metres without failure of the outer ply or the sealed ends, and with the product remaining in its pouch intact at all times.
  • the composite material By making the composite material from a combination of paper and polymer film layer so that the two are bonded together, the composite material can provide a heat sealable surface, increased tear and scuff resistance, a laminating medium, and an excellent barrier against grease, oil, gases, moisture and other environment.
  • the composite material can also be recycled by separating the polymer from the paper layer.
  • the preferred polyester film layer (example 4) and the preferred polyethylene/polypropylene film layer (Examples 2 and 3) offer a wide range of desirable features including:
  • the polymer film may provide too much of a barrier against gasses, particularly where the material contained within the pouch requires some gas interchange with the atmosphere. In which case it is preferably that the polymer film is provided with minute gas permeable apertures prior to or after laminating to the payer layer.
  • the material of the examples described above is particularly suited to an outer covering for the packaging of full fat milk powder, but preferably should be modified before use in the construction of an outer covering for a skim milk powder bag.
  • the easy opening feature may involve a tear strip or the like at or adjacent to the top of the bag, or may involve one along the longitudinal seam, or elsewhere on the bag, or may be formed as part of the base of the bag.
  • the top of the bag is formed with a fold over flap, which can be sealed by an appropriate adhesive after packing and sealing of the inner pouch.
  • any convenient form of top can be provided, and in some cases it may be preferable to seal the outer bag with a separate outer top or covering (particularly as the outer bag is formed from a single layer of composite material, and hence the flap if it is included needs to be part of the bag which is longer than the pouch associated with the bag, and this may involve some relative displacement of the pouch material from the outer covering material during manufacture of the bag).
  • Any convenient means of sealing the top of the bag can be used after the bag has been filled.
  • the bag is so designed that the inner pouch can be heat sealed, by the application of heat bars to the outside of the bag, and it is thus preferable that the polymer film material bonded to the paper of the outer covering has a higher melting point or higher sealing point than the material of the pouch.
  • heat sealing of the pouch should be effected, in such a way that the pouch is not in any way bonded to the outer covering of the bag as a result of the heat sealing process.
  • the inner pouch will be tacked to the outer covering of the bag in one or two places using spots of hot melt adhesive or the like, to facilitate location of the pouch during the various following operations, and to assist the pouch in being held in a stable position during filling of the bag. These spots of adhesive are designed to enable the outer covering to be readily pulled away from the inner pouch without damage to the inner pouch, when the product has reached its destination.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Laminated Bodies (AREA)
  • Packages (AREA)
  • Wrappers (AREA)

Abstract

L'invention concerne un sac (28) formé à partir d'au moins un stratifié de papier (17, 19) et un matériau polymère (18, 20) possédant une extrémité fermée d'usine (21) et une extrémité utilisable par un client (ouverte ou valvée). Un mode de réalisation d'intérêt consiste en un ensemble de sac ouvert (28) et un sac de protection extérieur (22) (de préférence à fond croisé) placé sur un sac intérieur d'usine en matière plastique (56, 61) ou en stratifié.
PCT/NZ2002/000218 2001-10-16 2002-10-16 Sac WO2003033370A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ514808 2001-10-16
NZ514808A NZ514808A (en) 2001-10-16 2001-10-16 Bag with inner sealable pouch and outer covering of composite layer of paper and polymer bonded together

Publications (1)

Publication Number Publication Date
WO2003033370A1 true WO2003033370A1 (fr) 2003-04-24

Family

ID=19928788

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2002/000218 WO2003033370A1 (fr) 2001-10-16 2002-10-16 Sac

Country Status (4)

Country Link
AR (1) AR036889A1 (fr)
NZ (1) NZ514808A (fr)
UY (1) UY27496A1 (fr)
WO (1) WO2003033370A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864948A1 (fr) * 2004-01-13 2005-07-15 Hugues Tomeo Sac en papier jetable pouvant etre utilise comme poubelle ou comme sac contenant. il est etanche - accrochable - et a fermeture.
US9181014B2 (en) 2009-01-12 2015-11-10 Besatori Llc Ecologically safe storage bag and transporting system and method of making same
EP3792055A1 (fr) * 2019-09-16 2021-03-17 Albéa Services Matériau stratifié comprenant une pluralité de feuilles de papier

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DE2550942A1 (de) * 1975-11-13 1977-05-18 Wilhelmstal Werke Gmbh Mehrlagiger sack
BE858368A (fr) * 1976-09-02 1978-03-02 Rayborn Jerry Boue de forage et procede d'emploi de celle-ci
DE2811219A1 (de) * 1978-03-15 1979-09-20 Herkules Verpackung Sack, beutel o.dgl.
EP0103650A1 (fr) * 1982-09-17 1984-03-28 Walter Dürbeck Papiersackfabriken GmbH & Co. KG Sac à valve
JPH0365333A (ja) * 1989-08-04 1991-03-20 Chugoku Pearl Hanbai Kk 裏貼包装袋の成形法とその裏貼フィルム
WO1992022474A1 (fr) * 1991-06-11 1992-12-23 Premier Brands U.K. Limited Perfectionnements apportes a l'emballage du the
US5281027A (en) * 1990-06-06 1994-01-25 Bemis Company, Inc. Multiple ply bag with detachable inner seal pouch for packaging products
WO1998018691A1 (fr) * 1996-10-31 1998-05-07 Amcor Packaging (Australia) Pty Ltd Sac a parois multiples
JPH1120822A (ja) * 1997-07-03 1999-01-26 Hosokawa Yoko Co Ltd 自立形牛乳及び乳製飲料用容器
US6033114A (en) * 1998-01-20 2000-03-07 Bagcraft Packaging, L.L.C. Window bag with polyester lining and method of forming same
WO2001025102A1 (fr) * 1999-10-04 2001-04-12 International Paper Company Sac multiparois a ouverture et fermeture faciles
EP0869073B1 (fr) * 1997-03-25 2001-05-30 Franpack Bates B.V. Sac à fond croisé comportant un sac interne en matière plastique et procédé pour sa fabrication.

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Publication number Priority date Publication date Assignee Title
DE2550942A1 (de) * 1975-11-13 1977-05-18 Wilhelmstal Werke Gmbh Mehrlagiger sack
BE858368A (fr) * 1976-09-02 1978-03-02 Rayborn Jerry Boue de forage et procede d'emploi de celle-ci
DE2811219A1 (de) * 1978-03-15 1979-09-20 Herkules Verpackung Sack, beutel o.dgl.
EP0103650A1 (fr) * 1982-09-17 1984-03-28 Walter Dürbeck Papiersackfabriken GmbH & Co. KG Sac à valve
JPH0365333A (ja) * 1989-08-04 1991-03-20 Chugoku Pearl Hanbai Kk 裏貼包装袋の成形法とその裏貼フィルム
US5281027A (en) * 1990-06-06 1994-01-25 Bemis Company, Inc. Multiple ply bag with detachable inner seal pouch for packaging products
WO1992022474A1 (fr) * 1991-06-11 1992-12-23 Premier Brands U.K. Limited Perfectionnements apportes a l'emballage du the
WO1998018691A1 (fr) * 1996-10-31 1998-05-07 Amcor Packaging (Australia) Pty Ltd Sac a parois multiples
EP0869073B1 (fr) * 1997-03-25 2001-05-30 Franpack Bates B.V. Sac à fond croisé comportant un sac interne en matière plastique et procédé pour sa fabrication.
JPH1120822A (ja) * 1997-07-03 1999-01-26 Hosokawa Yoko Co Ltd 自立形牛乳及び乳製飲料用容器
US6033114A (en) * 1998-01-20 2000-03-07 Bagcraft Packaging, L.L.C. Window bag with polyester lining and method of forming same
WO2001025102A1 (fr) * 1999-10-04 2001-04-12 International Paper Company Sac multiparois a ouverture et fermeture faciles

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DATABASE WPI Derwent World Patents Index; Class A92, AN 1999-162811/14 *
DATABASE WPI Derwent World Patents Index; Class P22, AN 1991-127936/18 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2864948A1 (fr) * 2004-01-13 2005-07-15 Hugues Tomeo Sac en papier jetable pouvant etre utilise comme poubelle ou comme sac contenant. il est etanche - accrochable - et a fermeture.
US9181014B2 (en) 2009-01-12 2015-11-10 Besatori Llc Ecologically safe storage bag and transporting system and method of making same
EP3792055A1 (fr) * 2019-09-16 2021-03-17 Albéa Services Matériau stratifié comprenant une pluralité de feuilles de papier
WO2021053043A1 (fr) * 2019-09-16 2021-03-25 Albea Services Tube comprenant une tête de tube et une jupe de tube constituée d'un matériau stratifié comprenant une pluralité de couches de papier
CN114423606A (zh) * 2019-09-16 2022-04-29 阿贝尔服务 包括管头和由包括多个纸层的层压材料制成的管裙状部的管
US11964454B2 (en) 2019-09-16 2024-04-23 Albea Services Tube comprising a tube head and a tube skirt made of a laminated material comprising a plurality of paper layers

Also Published As

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UY27496A1 (es) 2003-05-30
AR036889A1 (es) 2004-10-13

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