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WO1996020664A1 - Procede et appareil de perforation d'une bande de matiere - Google Patents

Procede et appareil de perforation d'une bande de matiere Download PDF

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Publication number
WO1996020664A1
WO1996020664A1 PCT/SE1995/001518 SE9501518W WO9620664A1 WO 1996020664 A1 WO1996020664 A1 WO 1996020664A1 SE 9501518 W SE9501518 W SE 9501518W WO 9620664 A1 WO9620664 A1 WO 9620664A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
anvil roller
roller
anvil
projections
Prior art date
Application number
PCT/SE1995/001518
Other languages
English (en)
Inventor
Bengt Lindquist
Original Assignee
Mölnlycke AB
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 Mölnlycke AB filed Critical Mölnlycke AB
Priority to AU44032/96A priority Critical patent/AU4403296A/en
Publication of WO1996020664A1 publication Critical patent/WO1996020664A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
    • B26F1/22—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material to form non-rectilinear cuts, e.g. for tabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/26—Perforating by non-mechanical means, e.g. by fluid jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7433—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9516—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools by controlling their vibration amplitude

Definitions

  • the present invention relates to a method and to apparatus for producing a material web which has a generally flat upper surface and a pattern of perforated recesses which project downwardly from the flat upper surface.
  • Such webs are often used as the top sheets of disposable absorbent articles, such as diapers, sanitary napkins, or incontinence guards, and include a plurality of holes which impart good liquid-permeability to the sheet.
  • the top sheets are also often made of a plastic material, partly to be able to provide a dry surface in contact with the wearer's skin, and partly for reasons of cost.
  • the holes are normally formed in the plastic materials by vacuum-forming, wherein recesses or hollows are formed in the material in conjunction with forming the holes. These recesses reduce the skin contact area of an article provided with such a top sheet, causing the article to be less plastic-like to the touch and to be more airy than when the holes are placed in the same plane as the upper surface of the top sheet.
  • SE-B-449 298 describes a top sheet of the aforedefined kind, which includes a pattern of recesses in which there are formed holes which are orientated in a plane extending generally perpendicular to the upper side of the sheet.
  • a top sheet has the additional advantage that underlying absorbent material and therewith material absorbed therein will be less visible than if the holes had lain in a plane which extends parallel with the upper side of said sheet, particularly when the article is seen from above.
  • the primary object of the present invention is to simplify and improve the aforesaid method.
  • This object is achieved with a method of the kind defined in the introduction which is characterized by providing a flat web of elastic material with a pattern of discrete cuts with the aid of an ultrasonic welding device, and thereafter producing a recess on one side of each cut in the web.
  • the positions of the cuts are determined solely by the positions of the anvils on the anvil holder of the welding device as distinct to the aforesaid method in which the cuts made by the cutting device must be aligned very accurately in relation to the anvils, meaning that the method according to the present invention is much simpler than the aforesaid known method.
  • the known cutting or clipping roller constitutes a component which must be changed often due to wear whereas an ultrasonic welding device has a long useful life span, and consequently the inventive method reduces the standstill or idling time of the process line in comparison with the aforesaid known method.
  • the edges of the cuts produced with the aid of an ultrasonic welding device are softer and more rounded than the edges of conventionally made cuts, meaning that the cut top sheet will be less coarse, i.e. smoother.
  • the web subsequent to being cut the web is supported by flat top surfaces on a member which projects out from an anvil roller and the recesses are formed by virtue of a projection on a press roller pressing those regions of the web which lie outside the flat top surfaces of the projection on the anvil roller into the spaces between adjacent projections on the anvil roller.
  • the invention also relates to apparatus for producing a material web having a generally flat upper side and a pattern of perforated recesses which project downwardly from said flat upper side, said apparatus being characterized by an ultrasonic welding device which includes an anvil roller having a pattern of anvils that stand out from projections on the peripheral surface of the roller, and one or more ultrasonic horns which extend radially outside the anvil roller in its axial direction across the width of the anvil pattern, a press roller which coacts with the anvil roller and which is provided with projections which are intended to penetrate into the spaces between the projections on the anvil roller in the nip between said rollers, and means for moving a material web through the device.
  • an ultrasonic welding device which includes an anvil roller having a pattern of anvils that stand out from projections on the peripheral surface of the roller, and one or more ultrasonic horns which extend radially outside the anvil roller in its axial direction across the width of the anvil pattern, a press roller which coacts with
  • the anvil roller is comprised of a peg roller having a plurality of peg rows extending peripherally around the roller, wherein each of the pegs has a flat top surface, and wherein the anvil surfaces are comprised of outwardly projecting ridges which extend along a peripheral edge of the flat top surface of each peg.
  • An outwardly projecting ridge preferably extends along each peripheral edge of the flat top surfaces of the pegs.
  • the anvil roller includes a plurality of axially separated rows of outwardly projecting ribs which extend peripherally around the anvil roller and have flat top surfaces, and rows of outwardly projecting ridges which extend along a peripheral edge of the top surface of each rib.
  • rows of outwardly projecting ridges extend along each peripheral edge of the outwardly projecting ribs.
  • Fig. 1 illustrates schematically a perforating arrangement according to a first embodiment of the invention
  • Fig. 2 is a sectioned view of the lower part of the ultrason ⁇ ic horn and a part of the anvil roller of the arrangement shown in Figure 1;
  • Fig. 3 is a sectional view taken on the line III-III in Figure 2;
  • Fig. 4 is a view similar to the view of Figure 2 and illus- trates a preferred embodiment of the anvil roller;
  • Fig. 5 is a sectioned view illustrating the coaction between an anvil roller and a press roller of the arrangement shown in Figure 1;
  • FIGs. 6 and 7 are cut-away perspective views of a web of material produced by the arrangement shown in Figure 1 and with the aid of an anvil roller constructed in accordance with Figure 2 and Figure 4 respectively.
  • the apparatus illustrated in Figure 1 includes an ultrasonic welding device 1 having a welding unit 2 and an anvil roller 3.
  • a press roller 4 is mounted adjacent to and coacts with the anvil roller 3.
  • the welding unit 2 includes conventional- ly an electric high-frequency generator, a transducer for converting electric energy to vibratory movement of an ultrasonic horn 5 at an ultrasonic frequency, and an amplifi ⁇ er for increasing the amplitude of the vibratory movement generated.
  • a first web 6 of elastic and weldable material, preferably plastic material, is passed through the device l and runs first between the ultrasonic horn 5 and the anvil roller 3, and then through the nip defined between the press roller 4 and the anvil roller.
  • the web 6 is preferably taken from a storage reel (not shown) and moved to the welding device on a conveyor, for instance a suction conveyor.
  • the welding unit 2 may be of any suitable kind, for instance of the kind marketed by Branson or Dukane. Although only one welding unit is shown in the Figures, it will be understood that several such units may be arranged transversely adjacent to one another, when the web 6 is to be cut over a width which requires the use of several units.
  • Figures 2 and 3 are respectively a partial longitudinal section view and a cross-section view of the anvil roller 3 and the ultrasonic horn 5.
  • longitudinal direction is meant here the direction A in which the web 6 moves.
  • the anvil roller is a peg roller having radially projecting pegs 7 which are disposed in a plurality of peg rows which are each separated in the axial direction of the roller. Each row of pegs includes a succession of pegs which extend around the full circumference of the roller. Each peg 7 has a flat top surface 8.
  • the anvils on the anvil roller 3 coacting with the ultrasonic horn are comprised of ridges 9, 10 which project out from each peripheral edge of the top surface 8 and which extend along the major part of these edges.
  • the web 6 is indicated in broken lines in the Figure and rests on the top surfaces 8 of the pegs 7 when passing the horn 5.
  • Figure 4 is a view similar to Figure 2 and shows an anvil roller 3' in which the ridges 10' project out from the peripheral edges of axially separated rows of ribs 7' which extend sequentially in the circumferential direction of the roller 3'.
  • a cross-sectional view similar to Figure 3 of the section of the anvil roller 3' and the ultrasonic horn shown in Figure 4 would have the same appearance as that shown in Figure 3 and is therefore not shown in the drawings.
  • the ultrasonic horn 5 is positioned at such a mean distance from the anvil ridges 9, 10 and 10' respectively and is driven with such power as to achieve complete through-melting of the plastic material in the web 6 at the anvil locations as the anvils pass the horn.
  • the web 6 will exhibit a pattern of longitu ⁇ dinally extending cuts where each cut has an extension which corresponds to the extension of the ridges.
  • the edges of the cuts When cutting with the aid of an ultrasonic welding device, the edges of the cuts will be softer and more rounded than when cutting with conventional knives or like devices, therewith imparting to the material 6 a smoother surface than that obtained when using conventional cutting tools. Further- more, the material can be cut without physical contact between horn and anvil, therewith resulting in only slight wear on the equipment in comparison with conventional cutting or clipping tools, whose cutting edges need to be sharpened at regular intervals. Since the exchange of knives requires the anvil roller and the knife carrier to be accurately realigned, which is a time-consuming task, the use of an ultrasonic welding device will result in far less standstill time occasioned by maintenance requirements.
  • the press roller 4 has around its periphery a number of projections in the form of ribs 11 which fit into the spaces between the rows of pegs 7 on the anvil roller (see Figure 3).
  • Figure 5 illustrates schematically and in longitudinal section view the manner in which recesses are produced in the nip between the press roller 4 and the anvil roller 3.
  • the flat web 6 is deformed by the ribs 11 on the press roller as the web passes through the nip between press roller and anvil roller, so that those parts of the web 6 that are located between adjacent rows of pegs 7 on the anvil roller will be pressed by the ribs 11 down into the spaces between adjacent rows of pegs.
  • Those parts of the web 6 that are located between adjacent pegs 7 in the peg rows will accompany the movement of the trans ⁇ versely outwardly-lying parts, this accompanying movement of said parts being facilitated by the cuts made in the web, .
  • Figure 6 is a schematic perspective view of part of the web shown in Figure 5 after leaving the press roller 4.
  • the web 6 produced by the apparatus shown in Figure 1 thus includes a pattern of recesses 13 in which two opposing openings 12 in the web 6 extend generally perpendicular to the upper side of said web.
  • Figure 7 is a view analogous with the view of Figure 6 and shows part of the web 6 produced when using the anvil roller 3' illustrated schematically in Figure 4.
  • the ribs on the press roller penetrate into the space between the ribs 7' as the web passes the nip between the press roller 4 and the anvil roller 3', therewith producing U-shaped recess channels 14, the walls of which extending perpendicular to the upper surface of the web 6 include a row of pair-wise opposing openings 12' in the web 6.
  • the web 6 is deformed plastically so as to obtain the configuration illustrated in Figures 6 and 7 respectively.
  • the cuts enable the parts located between two opposing cuts in the web to move more easily than remaining parts, and consequently the plastic deformation and therewith the thickness of the material will be different in different parts of the web.
  • This phenomenon can be utilized to control the elasticity of the web, for instance by displacing all the pegs in the rows of pegs or the ribs in the rows of ribs on the anvil roller in relation to one another.
  • the longitudinally extending ridges on the top surfaces of the pegs or the ribs may extend solely along one peripheral edge.
  • the projections on the anvil roller and the press roller may also have forms other than those shown. Neither need the projections on the rollers complement one another hand in a glove.
  • the cross-section of the press roller may be such as to fill only a part of the space between the rows of pegs or ribs on the anvil roller, particularly when only the anvils extend along a peripheral edge of the top surfaces of the pegs or ribs.
  • the welding unit or units may be movable vertically from an active position, so as to enable the web to be cut intermittently in a simple manner.
  • the web may be comprised of other elastic materials than plastic material or may be comprised of a composite sheet, such as a plastic nonwoven laminate. The invention is therefore restricted solely by the content of the following Claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

L'invention concerne un procédé de production d'une bande de matière (6) présentant une surface supérieure de forme générale plane ainsi qu'une configuration d'évidements perforés (13; 14) saillants vers le bas à partir de la surface supérieure plane. Selon l'invention, une bande plane (6) en matière déformable plastiquement est dotée d'une configuration de découpes séparées mutuellement à l'aide d'un dispositif de soudage (1) à ultrasons, après quoi on forme un évidement (13; 14) sur une face de chaque découpe dans la bande. L'invention concerne également un appareil de mise en ÷uvre du procédé.
PCT/SE1995/001518 1994-12-30 1995-12-19 Procede et appareil de perforation d'une bande de matiere WO1996020664A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU44032/96A AU4403296A (en) 1994-12-30 1995-12-19 A method and apparatus for perforating a web of material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9404565A SE508245C2 (sv) 1994-12-30 1994-12-30 Förfarande och anordning för att perforera en materialbana
SE9404565-5 1994-12-30

Publications (1)

Publication Number Publication Date
WO1996020664A1 true WO1996020664A1 (fr) 1996-07-11

Family

ID=20396518

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/001518 WO1996020664A1 (fr) 1994-12-30 1995-12-19 Procede et appareil de perforation d'une bande de matiere

Country Status (7)

Country Link
AU (1) AU4403296A (fr)
CO (1) CO4440640A1 (fr)
GB (1) GB2296464A (fr)
SE (1) SE508245C2 (fr)
TN (1) TNSN95141A1 (fr)
WO (1) WO1996020664A1 (fr)
ZA (1) ZA9510719B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7005558B1 (en) 1996-05-02 2006-02-28 Sca Hygiene Products Ab Apertured covering sheet for an absorbent article and a method of producing the covering sheet
US8603053B2 (en) 2006-04-12 2013-12-10 Birgit Riesinger Primary dressing
CN108883624A (zh) * 2016-03-24 2018-11-23 大王制纸株式会社 弹性膜伸缩结构的形成方法和吸收性物品
CN111971164A (zh) * 2018-04-20 2020-11-20 花王株式会社 复合片的制造装置和制造方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6277224B1 (en) * 1999-12-23 2001-08-21 Edward Muesch Ultrasonic perforator and a method for performing an ultrasonic perforation
US9861533B2 (en) 2013-05-08 2018-01-09 The Procter & Gamble Company Apertured nonwoven materials and methods for forming the same
WO2016073694A1 (fr) 2014-11-06 2016-05-12 The Procter & Gamble Company Article absorbant ayant des effets de couleur
CN107106355B (zh) 2014-11-06 2020-11-03 宝洁公司 卷曲纤维纺粘非织造网/层压体
WO2016073727A1 (fr) 2014-11-06 2016-05-12 The Procter & Gamble Company Articles absorbants comprenant des stratifiés face au vêtement
EP3582733B1 (fr) 2017-02-16 2022-08-17 The Procter & Gamble Company Articles absorbants avec des substrats ayant des motifs répétitifs d'ouvertures comprenant une pluralité d'unités récurrentes
JP6934405B2 (ja) * 2017-11-21 2021-09-15 花王株式会社 複合シートの製造方法及び製造装置
US12127925B2 (en) 2018-04-17 2024-10-29 The Procter & Gamble Company Webs for absorbent articles and methods of making the same
EP3958809A1 (fr) 2019-04-24 2022-03-02 The Procter & Gamble Company Bandes non tissées hautement extensibles et articles absorbants présentant de telles bandes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073021A (en) * 1980-04-02 1981-10-14 Hirschman S Feminine hygienic pads
US4626254A (en) * 1984-05-15 1986-12-02 Molnycke Ab Absorbent article

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195113A2 (fr) * 1985-02-14 1986-09-24 Kargunis, Ltd. Bande thermoplastique texturée et dispositif pour la fabrication de cette bande
US4842794A (en) * 1987-07-30 1989-06-27 Applied Extrusion Technologies, Inc. Method of making apertured films and net like fabrics
JPH07178697A (ja) * 1993-12-21 1995-07-18 Sanyo Yakuhin Kogyo Kk 有孔シートの製造方法および製造装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073021A (en) * 1980-04-02 1981-10-14 Hirschman S Feminine hygienic pads
US4626254A (en) * 1984-05-15 1986-12-02 Molnycke Ab Absorbent article

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7005558B1 (en) 1996-05-02 2006-02-28 Sca Hygiene Products Ab Apertured covering sheet for an absorbent article and a method of producing the covering sheet
EP0959842B2 (fr) † 1996-05-02 2006-06-21 SCA Hygiene Products AB Feuille de couverture ajouree pour article absorbant et procede de production de cette feuille
US8603053B2 (en) 2006-04-12 2013-12-10 Birgit Riesinger Primary dressing
CN108883624A (zh) * 2016-03-24 2018-11-23 大王制纸株式会社 弹性膜伸缩结构的形成方法和吸收性物品
CN111971164A (zh) * 2018-04-20 2020-11-20 花王株式会社 复合片的制造装置和制造方法

Also Published As

Publication number Publication date
ZA9510719B (en) 1996-06-20
CO4440640A1 (es) 1997-05-07
GB9525255D0 (en) 1996-02-07
GB2296464A (en) 1996-07-03
SE9404565L (sv) 1996-07-01
SE508245C2 (sv) 1998-09-21
AU4403296A (en) 1996-07-24
TNSN95141A1 (fr) 1996-02-06
SE9404565D0 (sv) 1994-12-30

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