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WO2003031281A1 - Sac - Google Patents

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Publication number
WO2003031281A1
WO2003031281A1 PCT/NZ2002/000206 NZ0200206W WO03031281A1 WO 2003031281 A1 WO2003031281 A1 WO 2003031281A1 NZ 0200206 W NZ0200206 W NZ 0200206W WO 03031281 A1 WO03031281 A1 WO 03031281A1
Authority
WO
WIPO (PCT)
Prior art keywords
bag
protective
protective bag
tear strip
assembly
Prior art date
Application number
PCT/NZ2002/000206
Other languages
English (en)
Inventor
Stephen Charles Fraser
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 WO2003031281A1 publication Critical patent/WO2003031281A1/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
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms

Definitions

  • This invention relates to packaging and in particular bags used for the packing of powders or granules.
  • bags typically have an inner plastic pouch, which can be heat sealed once filled with product, and is surrounded and supported, by an outer bag.
  • the outer bag is formed from multiple layers of paper.
  • Such bags are used to pack and transport resins, plastics, granules and in particular food grade materials such as milk powders, casein, powdered choose, protein products, and a variety of food ingredients.
  • Such bags require the outer bag to be removed prior to dispensing the contents from the inner sealed pouch.
  • the present invention consists in a lie flat bag assembly of a kind having a plastics pouch within a block bottom factory finished end (the "bottom end") protective bag, the pouch and the protective bag having their mouths opening in the same direction at the top the bag being characterised in that
  • the protective bag has at the customer fill end (the "top end") a closure flap from one of its panels capable of being folded across the mouth of the protective bag to lap part of another panel thereby, when adhered thereto, to effect at least a substantial closure of the mouth of the protective bag, (ii) at least one of the lapping surfaces (ie; of at least part of the closure flap and part of said another panel) is of and/or is coated with a heat activatable adhesive, (iii) a tear strip is provided on a surface of or in the closure flap and/or its panel to allow, by its use as a tear strip, the tear opening of the closure flap enclosed mouth of the protective bag by enabling a separation of part or all of the closure flap from its other part or the panel from which it was folded.
  • the tear strip is on a surface of the closure flap that is concealed when the protection bag is closed.
  • the tear strip is of a plastics material.
  • the protective bag is of one or more plies of paper.
  • said plastics pouch is of a thermoplastic material capable of being heat sealed at or adjacent its mouth whilst within the protective bag.
  • the tear strip may have been provided by an extrusion process directly on to a surface of the protective bag in which case, preferably, the thermoplastic material of the tear strip has a higher tack initiation temperature than does the adhesive to be heat activated to enable the effecting of the closure.
  • the tear strip may have been provided by a self adhesive tape applied to a surface of the protective bag.
  • the tear strip has a tack temperature at least 20 °C greater than that of the heat activated adhesive.
  • the invention provides a factory produced block bottom lie flat bag having an inner plastics pouch capable of being heat sealed after insertion of a product such as a powder or granule, and an outer protective covering, wherein the outer protective covering having the block bottom has a closeable top portion extending transversely across the top of the bag, and a tearing means has been factory provided on the outer protective layer prior to closure of the outer protective covering.
  • the bag has a folded flap closure, and will preferably make use of adhesive to secure the flap across the top of the bag.
  • a tear strip (ie; is not a string) formed on or adj acent to the top flap.
  • the adhesive used for sealing the top flap of the bag is a heat re-sealable hot melt adhesive. This is preferably applied to both the flap, and the adjoining portion of the bag to be covered by the flap.
  • the tear strip is formed by application to the protective covering material a tensile material, which can be applied as a continuous strip or stripe to the top of the bag.
  • This tensile material can be applied as (i) a molten plastics material which adheres to a portion of the bag during manufacturing, but which sets to a solid strip having sufficient tensile strength to enable it to be pulled to cause the top of the bag to be opened, (ii) as a preformed (preferably self adhesive) tape.
  • the top of the bag has either perforations or notches, in association with the tensile material, so that a portion of top of the bag (or the flap or both) is weakened to facilitate tearing of the top of the bag by the use of pulling on the tensile material.
  • the tensile material is applied a form of hot melt adhesive which is applied to the inside of the flap of the bag and allowed to cure in situ, before other layers of hot melt adhesive are applied to the flap and the exterior of the bag.
  • Such a material is preferably applied after perforating or notching of the bag, so that the tensile material covers, and plugs up any perforations in that portion of the bag.
  • the present invention consists in a filled and fully closed bag assembly in accordance with the present invention, the filling being with a particulate material, the plastics pouch having been heat sealed by application of heat through the protective bag and the protective bag having been closed with the lapping surfaces mating after heat activation of the heat activatable adhesive.
  • Figure 1 is a front elevation of a bag prior to closure of the top
  • Figure 2 is a similar view to that of Figure 1 but concentrating on the top or customer end of an unfilled bag assembly in accordance with the present invention
  • FIG 3 is a diagrammatic section of the bag of Figure 2 at "AA"
  • Figure 4 shows a flow diagram of a filling method for bag assemblies of the prior art kind discussed hereinafter, the bag assemblies of the present invention involving a similar filling methodology but without requiring scoring wheels to score the inner pouch and hence not requiring a station for such a purpose,
  • Figure 5 is a flow diagram schematic of the tubing and bottoming process
  • Figure 6 shows details of the bottoming station.
  • a breakaway adhesive is preferably used to attache the pouch onto the outer layer/s of the bag for manufacturing and filling purposes. On removing the filled pouch from the outer coverings, the adhesive is designed to "release the pouch", with minimal fibre tear from the outer layer.
  • Adhesives used in this application could be a Henkel Grippit Z 9834TM or Mercator Technology's EM 186TM.
  • a bag 10 is formed to include a plastic pouch (eg; polyethylene), a base portion 11 , and a top flap 12.
  • a plastic pouch eg; polyethylene
  • the flap is designed to be folded over the edge 19 after filling and sealing of the pouch, so that the outer covering 13 completely covers and surrounds the inner pouch.
  • the bag may have a longitudinal seam 15.
  • the bag is preferably formed with an outer covering made up of two ply of paper, preferably Kraft paper.
  • an outer covering made up of two ply of paper, preferably Kraft paper.
  • the inner and outer layers of paper can be offset from one another to allow for the formation of the flap 12.
  • the outer covering of the bag formed from a single layer of material, in which case the flap may need to be specially formed.
  • the pouch is surrounded by the paper outer, and this is then sealed by appropriate adhesive layers along seam 15.
  • the base of the bag 11 is formed, and the inner pouch is tacked to one side of the paper outer bag by holt melt adhesives or the like, so that the plastic pouch is held in situ during both the formation of the bag, and during filling.
  • the base of the bag may be a block base, although any type of base can be formed depending on the end use of the bag. In the packaging of milk powder, a block base bottom is preferred.
  • the manufacturing procedure, base, formation of the inner plastics pouch and the formation of the outer protective pouch can be any appropriate variant including for example, those disclosed in our New Zealand Patent No. 242034 the full content of which is here included by way of reference.
  • the top flap is designed to be adhered to the top of the bag by means of a suitable adhesive.
  • the adhesive is a heat re-sealable hot melt so that once the bag is supplied to an end user, and the plastic pouch is filled with a product, the plastic pouch is then being heat sealed, by the application of heat sealing bars applying heat and pressure through the outer paper layer(s) and into contact with the plastic pouch. Once the pouch has been sealed the top flap is folded over, and adhered by the adhesive layer. If the adhesive layer is a resealable hot melt, then the application of heat and pressure in the packing plant will enable the top flap to be suitable folded and sealed.
  • a tear strip is provided at the top of the bag as shown in Figure 1.
  • This tear strip can be formed during manufacture of the bag by the application of a meltable plastics layer, applied as a bead, stripe or the like across the top of the bag at about the position of the fold line of the top flap.
  • a material which can be melted, and applied as a thick bead or stripe, and allowed to solidify in situ it is possible to extrude this, during manufacture of the bag leaving a small portion protruding from one or both sides of the bag.
  • a layer of hot melt (heat re-sealable) adhesive can be applied over the top of this tensile strip, and then allowed to cool to a "non-tacky" state.
  • a similar layer of re-sealable hot melt adhesive can be applied to the outside of the top of the bag adj acent to the top flap.
  • the tensile material is applied first as strip 20, it is then covered by a layer of hot melt adhesive covering the inside of the top of the flap as layer 21, and the outside of the top of the bag (the inner ply of a two ply bag) is provided with layer 22 of re- sealable hot melt material.
  • the tensile material is preferably a holt melt adhesive, or similar meltable material (eg; if applied as a tape or extruded) but which is not capable of being re- melted during sealing of the flap. This means that it would preferably have a much higher melting point than the heat re-sealable hot melt applied to the top flap.
  • the hot melt adhesive used at the customer end is a low temperature LDPE or EVA (Ethyl Vinyl Acetate) based adhesive, typically known as 'hot melt' adhesives.
  • the hot melt adhesive is applied to the outer layer material using a common application method, for example using a Nordson Hot melt applicator.
  • the hot melt is generally applied to the bag at temperatures in the range of 140 to 180 degrees C.
  • the hot melt adhesive has a reactivating temperature typically in the range of 110 to 130 degrees C.
  • the tear tape is mono axially oriented polymer tape coated with a pressure sensitive adhesive on one side.
  • Typical tear tape physical properties are stable up until 180 degrees C.
  • Certain types of tear tape are stable up to 250 degrees C and beyond.
  • a differential of at least 20 degrees C should desirably be maintained between the reactivating temperature of the hot melt adhesive and the temperature at which the tear tape's physical properties are affected by the temperature.
  • the tear feature may be extruded onto the outer material using an extrusion method where the polymeric material is heated under pressure to around its melting point and extruded through a die to form a shape similar to the tear tape. Hot melt can then be applied into the nip point between the tape and the outer layer, bonding the polymeric material to the outer layer.
  • the tear strip if provided as an applied tape is mono axially oriented polymer coated with a pressure sensitive adhesive that when attached to the outer layer material under pressure bonds to the outer layer material.
  • An example of the tear tape is RIPPATAPETM supplied by PP Payne, UK capable of being applied with a Standard Budget Applicator supplied by PP Payne, UK.
  • the outer layer of the bag maybe of a material which is designed to tear readily, and it may not be necessary to provide perforations, nicks, or slits in the top of the bag during manufacture.
  • the outer material of the bag is sufficiently strong that its tear resistance is great enough to resist damage to the outside layer of the bag during manufacture, packaging and transport.
  • one or more weaknesses are provided in the top of the bag, and this may take the form of a nick at either or both ends of the bag, or needle perforations, or partial perforations or slits in an outermost layer of the bag (if two ply paper material is used then it may be possible to perforate one layer but not the inner most layer).
  • nicks or notches be provided on either side of the bag, and that these nicks or notches be covered completely by the plastics material which is allowed to solidify, so that there is no aperture for the ingress of dirt, insects or other material.
  • the tear strip, and any associated perforations will be situated above the heat sealed portion of the plastics pouch. Nevertheless it is preferable that the extruded plastics material used to form the tensile strip is of sufficient size to completely cover any weakened portions of the bag. This has the advantage that on pulling the tensile strip, it is possible to cause the bag to tear neatly along the line of weakness.
  • the weakening or perforating desired yet optional can be effected anywhere between the last tubing process and the collating point prior to the compression station in the bag making process.
  • a number of different mechanisms maybe employed to get the desired effect.
  • the outer ply or plies of material may be perforated using a laser method, like a variant of the Linx XymarkTM laser coding system, or a more typical pin-and-wheel device for mechanically perforating and weakening the outer layers.
  • the invention has been described with reference to a two ply bag embodiment in which the outer bag is formed of two ply of Kraft paper or the like. It is applicable to any outer covering for example a three ply or four-ply paper covering, a plastics covering, or a single layer outer bag (and is preferably a single layer composite material as described in our co-pending patent application).
  • the tear strip is formed transversely across the top of the bag it could be formed at any location in the outer covering, e.g; it could be formed as part of the longitudinal seam, or it could (less preferably) be formed in or adjacent the base of the bag.
  • the base of the bag can be formed more securely, and be designed to resist impacts, such as the industry standard "vertical drop test".
  • the assembly comprises a protective bag (gusseted or non gusseted, preferably not gusseted) which includes a front panel defined by Kraft paper sheets 23 and 24. It follows therefore that the same plies provides the rear panel 23 A and 24A.
  • the tear strip 25 is preferably of tape as aforesaid and hot melt regions 26 and 27 respectively are provided on the paper plies 24 and 23 A respectively over the top flap region 28 of the ply 23 A such that it will lap over fold and mate with its heat activatable holt melt adhesive.
  • the greater depth of the region 27 (as far as in the plane of the bag assembly is concerned) means that some of the heat activatable hot melt 27 is available to lap over not only the exposed heat activatable adhesive 26 of the ply 24 but also a top part of the panel or ply 23. It can be seen that the tear strip therefor has the capability of being uplifted at an edge to effect a tear across the ply 23 A thus allowing access to the by then sealed plastic pouch with its plies 29.
  • the bag is formed with an internal plastic pouch (inner) and an outer protective covering (outer) made up of multiple plies of Kraft paper.
  • the outer ply material have basis weight in the range from 90 - 150 gm per m2.
  • the Kraft paper plies provide a soft, shock-absorbing covering.
  • the internal plastic pouch can be produced with permeable film, or gas and moisture barrier film.
  • the permeable film tube is made from low density polyethylene preferably by means of monolayer blown film extrusion.
  • the barrier film tube is made from combinations of low density polyethylene, linear low density polyethylene, medium density polyethylene, and resins with gas barrier properties, such are ethylene vinyl alcohol, polyamide (Nylon), etc.
  • the process for the barrier film production is multilayer blown film extrusion preferably.
  • FIG. 4 The forming of a bag as shown in Figures 2 and 3 is by a procedure shown by way of diagram 4 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 involves scoring wheels to score the inner pouch, 38 is the hot melt adhesive system reactivation, 39 involves folding ski's, 35 involves pressure rollers and 36 involves a weight station, metal detection station and warehousing.
  • 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 involves scoring wheels to score the inner pouch
  • 38 is the hot melt adhesive system reactivation
  • 39 involves folding ski's
  • 35 involves pressure rollers
  • 36 involves a weight station, metal detection station and warehousing.
  • the procedure 33 through 36 are those used with bags not incorporating the feature of the present invention. Bag assemblies of the present invention do not require step 37.
  • Figure 5 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 of f 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 tear top feature of the present invention allows for easy opening from the top or "customer" end (ie; the filling end) of the bag.
  • the design of the block bottom preferably used is to make it easy to hold on to and therefore allows for easier tipping out of the plastic pouch.
  • this invention will facilitate the manufacture of bags, and provide advantages both in the manufacture of the bags, and in the filling and transport of such bags.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)

Abstract

L'invention concerne un ensemble de sac porté à plat du genre à comporter une poche en plastique (29) à l'intérieur d'un sac de protection à extrémité inférieure finie (11) à l'usine (« l'extrémité inférieure ») en bloc. La poche (29) et le sac de protection (13) ont des ouvertures donnant dans la même direction. Le sac (10) est caractérisé en ce que (i) le sac de protection (13) présente au niveau de l'extrémité de remplissage du consommateur (« l'extrémité supérieure ») un volet de fermeture (12) partant d'un des panneaux capables de se plier sur l'ouverture dudit sac de protection (13) pour recouvrir partiellement l'autre panneau, lorsqu'ils y adhèrent afin de fermer au moins partiellement l'ouverture du sac de protection (13), (ii) en ce qu'au moins une des surfaces de recouvrement (23A) (par exemple, d'au moins une partie du volet de fermeture (12) et une partie de l'autre panneau 24) est constituée et/ou recouverte d'un adhésif thermo-activable (21), et (iii) en ce qu'une bande déchirable (25) se trouve sur une surface dudit volet de fermeture (12) ou dans ledit volet et/ou dans son panneau (24), afin de permettre, au moyen de ladite bande (25), l'ouverture par déchirure de l'ouverture fermée du volet de fermeture (12) du sac de protection. Ceci est réalisé par une séparation d'une partie ou de l'ensemble du volet de fermeture (12) de son autre partie ou du panneau (28), à partir duquel il a été plié.
PCT/NZ2002/000206 2001-10-10 2002-10-07 Sac WO2003031281A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ514701 2001-10-10
NZ51470101A NZ514701A (en) 2001-10-10 2001-10-10 Bag with inner pouch and outer bag having tear strip with sufficiently high tack temperature

Publications (1)

Publication Number Publication Date
WO2003031281A1 true WO2003031281A1 (fr) 2003-04-17

Family

ID=19928779

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2002/000206 WO2003031281A1 (fr) 2001-10-10 2002-10-07 Sac

Country Status (4)

Country Link
AR (1) AR036792A1 (fr)
NZ (1) NZ514701A (fr)
UY (1) UY27482A1 (fr)
WO (1) WO2003031281A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005000696A1 (fr) * 2003-06-26 2005-01-06 Flexipol Packaging Ltd Sac a double paroi
US7581371B2 (en) 2006-04-25 2009-09-01 Cryovac, Inc. Retail package for flowable products
WO2019040977A1 (fr) * 2017-08-28 2019-03-07 Orora Packaging Australia Pty Ltd Sac et procédé
WO2020046146A1 (fr) * 2018-08-31 2020-03-05 Powder Projects Limited Appareil et procédé de traitement de sacs collés à sommet étagé
US12226993B2 (en) 2021-09-17 2025-02-18 Proampac Holdings Inc. Recyclable packaging film and article with mechanically pre-slit controlled tear line

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE858369A (fr) * 1976-09-03 1978-01-02 St Regis Paper Co Sacs a parois multiples, a poches detechee, pour l'emballage d'articles
EP0103650A1 (fr) * 1982-09-17 1984-03-28 Walter Dürbeck Papiersackfabriken GmbH & Co. KG Sac à valve
EP0264606B1 (fr) * 1986-10-22 1990-01-17 Wilhelmstal-Werke GmbH. Papiersackfabriken Sac composé d'un sac extérieur et d'un sac intérieur
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
CA2304261A1 (fr) * 1999-08-12 2001-02-12 International Paper Company Sac multicouches a bande d'ouverture dechirable
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.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE858369A (fr) * 1976-09-03 1978-01-02 St Regis Paper Co Sacs a parois multiples, a poches detechee, pour l'emballage d'articles
EP0103650A1 (fr) * 1982-09-17 1984-03-28 Walter Dürbeck Papiersackfabriken GmbH & Co. KG Sac à valve
EP0264606B1 (fr) * 1986-10-22 1990-01-17 Wilhelmstal-Werke GmbH. Papiersackfabriken Sac composé d'un sac extérieur et d'un sac intérieur
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.
CA2304261A1 (fr) * 1999-08-12 2001-02-12 International Paper Company Sac multicouches a bande d'ouverture dechirable
WO2001025102A1 (fr) * 1999-10-04 2001-04-12 International Paper Company Sac multiparois a ouverture et fermeture faciles

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005000696A1 (fr) * 2003-06-26 2005-01-06 Flexipol Packaging Ltd Sac a double paroi
GB2404368A (en) * 2003-06-26 2005-02-02 Flexipol Packaging Ltd Bag removably held in outer bag
GB2404368B (en) * 2003-06-26 2007-01-03 Flexipol Packaging Ltd Improvements in bags and sacks
US7581371B2 (en) 2006-04-25 2009-09-01 Cryovac, Inc. Retail package for flowable products
WO2019040977A1 (fr) * 2017-08-28 2019-03-07 Orora Packaging Australia Pty Ltd Sac et procédé
WO2020046146A1 (fr) * 2018-08-31 2020-03-05 Powder Projects Limited Appareil et procédé de traitement de sacs collés à sommet étagé
EP3844080A4 (fr) * 2018-08-31 2022-09-28 Powder Projects Limited Appareil et procédé de traitement de sacs collés à sommet étagé
AU2019329035B2 (en) * 2018-08-31 2025-07-10 Powder Projects Limited Apparatus and method for processing of step top glued bags
US12226993B2 (en) 2021-09-17 2025-02-18 Proampac Holdings Inc. Recyclable packaging film and article with mechanically pre-slit controlled tear line

Also Published As

Publication number Publication date
AR036792A1 (es) 2004-10-06
NZ514701A (en) 2004-07-30
UY27482A1 (es) 2003-05-30

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