WO1998052505A1 - An absorbent multilayer material and a method and arrangement for its manufacture - Google Patents
An absorbent multilayer material and a method and arrangement for its manufacture Download PDFInfo
- Publication number
- WO1998052505A1 WO1998052505A1 PCT/SE1998/000898 SE9800898W WO9852505A1 WO 1998052505 A1 WO1998052505 A1 WO 1998052505A1 SE 9800898 W SE9800898 W SE 9800898W WO 9852505 A1 WO9852505 A1 WO 9852505A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- absorbent
- hydrophobic
- rows
- layers
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 71
- 239000002250 absorbent Substances 0.000 title claims abstract description 55
- 230000002745 absorbent Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title description 5
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 19
- 238000002604 ultrasonography Methods 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 claims description 10
- 229920006255 plastic film Polymers 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 46
- 239000012530 fluid Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 4
- -1 polyethylene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
-
- 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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01021—Non-adhesive bandages or dressings characterised by the structure of the dressing
- A61F13/01029—Non-adhesive bandages or dressings characterised by the structure of the dressing made of multiple layers
-
- 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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01034—Non-adhesive bandages or dressings characterised by a property
-
- 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
- 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
-
- 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
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
- A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
-
- 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
- A61F13/53—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 absorbing medium
- A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53704—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having an inhibiting function on liquid propagation
-
- 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
- A61F2013/00089—Wound bandages
- A61F2013/00217—Wound bandages not adhering to the wound
-
- 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
- A61F2013/00089—Wound bandages
- A61F2013/00314—Wound bandages with surface treatments
- A61F2013/00327—Wound bandages with surface treatments to create projections or depressions in surface
-
- 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
- A61F2013/00361—Plasters
- A61F2013/00544—Plasters form or structure
- A61F2013/00604—Multilayer
-
- 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
- A61F13/53—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 absorbing medium
- A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F2013/53765—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
- A61F2013/53782—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with holes
-
- 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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/0045—Perforating
-
- 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
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- 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
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
-
- 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
- B29C66/45—Joining of substantially the whole surface of the 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
- B29C66/81—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
- B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
-
- 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
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
Definitions
- the present invention relates to an absorbent multilayer material and also to a method and to an arrangement for its manufacture .
- the dressings are normally constructed of a layer of material that can only adhere lightly to the wound, or sore, and an overlying layer of absorbent material.
- the layer of the dressing that lies against the wound is often comprised of a perforated plastic film.
- the surface sheet of absorbent articles, such as sanitary napkins or diapers, will also often include a perforated plastic layer which is intended to lie proximal to the wearer's body in use. In order for such articles to function effectively, it is essential that the dressing and such surface layers are constructed to achieve effective transportation of discharged fluid or liq- uid into the absorbent layer, through the openings in the plastic film.
- the object of the present invention is to provide an absorbent multilayer material which is composed of one or more absorbent layers, or sheets, fastened to a layer of hydrophobic material that has good fluid or liquid transportation and absorption properties and with which there is little danger of any part of the absorbent layer coming into contact with the wound or with the wearer's skin.
- an absorbent multilayer material that includes a perforated layer, or sheet, of hydrophobic material and at least one layer, or sheet, of absorbent material.
- the inventive material is characterised in that mutually sequential rows of depressions are disposed over that side of the material which lies above that side of said material which includes said hydrophobic layer, wherein said depressions have the form of hammock-like parts of the hydrophobic layer that penetrate down into the absorbent layer so as to form openings at right angles to the plane of the hydrophobic layer, and wherein the hammock-like parts are fastened to the absorbent layer over the major part of their surfaces; and in that the absorbent layer is compressed in the region of each depression.
- the openings in the multilayer material are perpendicular when the articles in which the multilayer materials included are placed in position, there is little danger of fibre ends or the like in the absorbent layer and present in said openings coming into contact with the surface of the wound or with the skin, while the compressed parts of the absorbent layer assist in transporting fluid quickly away from the openings.
- the hydrophobic layer or sheet is comprised of plastic film and the absorbent layer, or sheet, is comprised of nonwoven material that includes absorbent fibres .
- the absorbent multilayer material includes several layers of nonwoven material, of which at least those layers that are not in contact with the hydrophobic layer include melt fibres.
- the absorbent layer is comprised of absorbent foam.
- the invention also relates to a method of producing an ab ⁇ sorbent multilayer material. The method is characterised by the steps of combining a layer of weldable hydrophobic material with at least one layer of absorbent material; passing the combined layers through the nip defined between an ultra- sound horn and an anvil roll with the layer of weldable mate- rial in abutment with the anvil roller, said roller having disposed in mutually sequential rows about its circumference discrete projections that have curved outwardly facing surfaces and vertical side surfaces and said rows extending essentially in an axial direction; and setting the distance between the ultrasound horn and the anvil roller so that the weldable material will be cut along the curved edges located between the outside and the vertical sides of each projection whilst simultaneously deforming the combined layers in the region of each projection so as to form rows of depressions and so as to fasten the weldable layer to the layer of absorbent material within the major part of the region of each pro
- several layers that include absorbent fibres are combined with the layer of weldable material, wherein at least those layers that do not lie against the layer of weldable material also include melt fibres .
- the invention also relates to arrangement for producing an absorbent multilayer material that has a perforated side.
- the arrangement is characterised by means for combining at least two webs of material, means for passing the combined webs through the nip defined between an ultrasound horn and an anvil roll that includes around its circumference mutually sequential rows of discrete projections that have curved outwardly facing surfaces and vertical side surfaces, said rows extending essentially in an axial direction, and means for cutting individual pieces of material from said combined web subsequent to its passage past the ultrasound horn.
- the vertical sides of said projections have a segmental shape.
- Fig. 1 is a schematic illustration of an arrangement for producing wound dressings, or pads, in accordance with one preferred embodiment of the invention
- Fig. 2 illustrates part of an anvil roll included in the arrangement shown in Fig. 1;
- FIG. 3 is a schematic illustration of a wound dressing or pad manufactured by means of the arrangement shown in Fig. 1;
- Fig. 4 is a sectioned view taken on the line IV-IV in Fig. 3;
- Fig. 5 is a sectioned view taken on the line V-V in Fig. 3.
- Fig. 1 illustrates schematically an inventive arrangement for manufacturing wound dressings or pads.
- the arrangement includes an anvil roll 1 and an ultrasound horn 2 included in a typical ultrasound welding unit positioned above the periphery of the anvil roll and movable in a radial direction so as to enable a mean distance to be set between the periphery of the anvil roll and said horn 2.
- the arrangement also includes means for drawing a web of material 3 through the nip defined between the roll 1 and the horn 2.
- the web 3 is comprised of two webs of material, i.e. a web 4 of plastic film and a web 5 of absorbent material, said webs being taken from respective storage reels 6 and 7.
- the plastic film 4 may consist of polyethylene and the web 5 may consist of nonwoven material that includes absorbent fibres, such as viscose or cellulose fibres.
- An appropriate material in this regard is a spun laced polypropylene-viscose nonwoven material.
- Fig. 2 shows part of the anvil roll 1 in larger scale.
- the periphery of the roll 1 includes rows of projections 10 that have curved outwardly facing surfaces 11 and vertical sides 12.
- outwardly facing surfaces is meant the outer peripheral sides 11 of the projections 10, and by “vertical sides” is meant that the mutually opposing circle-segment shaped sides 12 of each projection are plane parallel with the plane of the paper in Fig. 1.
- the horn will press the webs 4, 5 against the periphery of the anvil roll as the horn moves up and down. It has been found that the plastic film that lies closest to the anvil roll 1 is cut by the opposing edges of the projections and that those web parts that lie outside these edges are then pressed down between said projections. At the same time, the side of the plastic layer that faces towards the web 5 will melt over the major part of the sides 12 of the projections 10. This re ⁇ sults in compression of the nonwoven material 5 in those parts of the material that lie between the outer sides of the projections and the horn. This compression remains when the individual dressings or pads are cut from the combined web 3.
- FIGs. 3-5 illustrate a wound pad or dressing produced in accordance with the described method.
- the Figures show the dressing with that side of the dressing that lies against a wound when the pad is applied facing upwards.
- the dressing is comprised of a layer 4' of plastic film and a nonwoven layer 5' and includes mutually parallel rows of depressions 13 in the plastic layer and the underlying nonwoven layer.
- the depressions 13 have a hammock-like configuration in the plas- tic layer, as will best be seen from Fig.
- openings 14 perpendicular to the plane of the dressing are formed by the mutually separated cut surfaces of the plastic layer.
- the nonwoven material is compressed in the region of each depressions, as evident from Figs. 4 and 5.
- the layers 4' and 5' are also welded together within a greater part of the region of each depression.
- Fluid, or liquid, absorbed in the absorbent material around the openings 14 will be quickly transported away therefrom, as a result of the smaller capillaries in the compressed parts of the absorbent layer 5'.
- the dressing may conveniently be provided with a backing sheet of hydrophobic nonwoven material, such as polypropylene, for instance.
- the wound dressing 9 can be sterilised by beta, steam or gas sterilising processes.
- the described method can be used advantageously for the manu- facture of liquid-permeable outer sheets for absorbent arti- cles such as sanitary napkins or diapers.
- outer sheets it is important that discharged liquid can be transported quickly away from the skin in order for the napkin or diaper to give the impression of being dry and also in order to reduce the risk of discharged liquid flowing along the surface of the plastic film.
- the wound dressing may include more than one layer of absorbent material, although the outer layers must contain melt fibres, such as polypropylene or polyester fibres. Materials other than nonwoven material can be used, such as absorbent foam material, for instance.
- the rows of projections may conveniently extend obliquely to the axial direction of the anvil roll.
- the statement in Claim 5 to the effect that the rows of projections extend "essentially in an axial direction" will be understood to include rows that define an angle of up to 45° with said axial direction.
- the projections may have a curved shape different to that shown in the Figures. It will there ⁇ fore be understood that the invention is restricted solely by the contents of the following Claims.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Epidemiology (AREA)
- Laminated Bodies (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The present invention relates to an absorbent multilayer material (9) that includes a perforated layer (4') of hydrophobic material and at least one layer (5') of absorbent material. According to the invention, mutually sequential rows of depressions (13) are disposed over that side of the multilayer material (9) which includes the hydrophobic layer (4'), wherein the depressions have the form of hammock-like parts of the hydrophobic layer that penetrate down into the layer of absorbent material (5') so as to form openings (14) perpendicular to the plane of the hydrophobic layer, wherein the hammock-like parts are fastened to the absorbent layer over the major part of their respective surfaces, and the absorbent layer is compressed within the region of each depression. The invention also relates to a method and to an arrangement for producing such material.
Description
AN ABSORBENT MULTILAYER MATERIAL AND A METHOD AND ARRANGEMENT
FOR ITS MANUFACTURE
The present invention relates to an absorbent multilayer material and also to a method and to an arrangement for its manufacture .
With the intention of preventing wound dressings from adhering to a wound, the dressings are normally constructed of a layer of material that can only adhere lightly to the wound, or sore, and an overlying layer of absorbent material. The layer of the dressing that lies against the wound is often comprised of a perforated plastic film. The surface sheet of absorbent articles, such as sanitary napkins or diapers, will also often include a perforated plastic layer which is intended to lie proximal to the wearer's body in use. In order for such articles to function effectively, it is essential that the dressing and such surface layers are constructed to achieve effective transportation of discharged fluid or liq- uid into the absorbent layer, through the openings in the plastic film.
The object of the present invention is to provide an absorbent multilayer material which is composed of one or more absorbent layers, or sheets, fastened to a layer of hydrophobic material that has good fluid or liquid transportation and absorption properties and with which there is little danger of any part of the absorbent layer coming into contact with the wound or with the wearer's skin.
This object is achieved by means of an absorbent multilayer material that includes a perforated layer, or sheet, of hydrophobic material and at least one layer, or sheet, of absorbent material. The inventive material is characterised in that mutually sequential rows of depressions are disposed
over that side of the material which lies above that side of said material which includes said hydrophobic layer, wherein said depressions have the form of hammock-like parts of the hydrophobic layer that penetrate down into the absorbent layer so as to form openings at right angles to the plane of the hydrophobic layer, and wherein the hammock-like parts are fastened to the absorbent layer over the major part of their surfaces; and in that the absorbent layer is compressed in the region of each depression. Because the openings in the multilayer material are perpendicular when the articles in which the multilayer materials included are placed in position, there is little danger of fibre ends or the like in the absorbent layer and present in said openings coming into contact with the surface of the wound or with the skin, while the compressed parts of the absorbent layer assist in transporting fluid quickly away from the openings.
In a preferred embodiment, the hydrophobic layer or sheet is comprised of plastic film and the absorbent layer, or sheet, is comprised of nonwoven material that includes absorbent fibres .
According to one variant, the absorbent multilayer material includes several layers of nonwoven material, of which at least those layers that are not in contact with the hydrophobic layer include melt fibres.
In another embodiment, the absorbent layer is comprised of absorbent foam. The invention also relates to a method of producing an ab¬ sorbent multilayer material. The method is characterised by the steps of combining a layer of weldable hydrophobic material with at least one layer of absorbent material; passing the combined layers through the nip defined between an ultra- sound horn and an anvil roll with the layer of weldable mate-
rial in abutment with the anvil roller, said roller having disposed in mutually sequential rows about its circumference discrete projections that have curved outwardly facing surfaces and vertical side surfaces and said rows extending essentially in an axial direction; and setting the distance between the ultrasound horn and the anvil roller so that the weldable material will be cut along the curved edges located between the outside and the vertical sides of each projection whilst simultaneously deforming the combined layers in the region of each projection so as to form rows of depressions and so as to fasten the weldable layer to the layer of absorbent material within the major part of the region of each proj ection.
In one preferred embodiment, several layers that include absorbent fibres are combined with the layer of weldable material, wherein at least those layers that do not lie against the layer of weldable material also include melt fibres .
The invention also relates to arrangement for producing an absorbent multilayer material that has a perforated side. The arrangement is characterised by means for combining at least two webs of material, means for passing the combined webs through the nip defined between an ultrasound horn and an anvil roll that includes around its circumference mutually sequential rows of discrete projections that have curved outwardly facing surfaces and vertical side surfaces, said rows extending essentially in an axial direction, and means for cutting individual pieces of material from said combined web subsequent to its passage past the ultrasound horn.
In one preferred embodiment of the invention, the vertical sides of said projections have a segmental shape.
The invention will now be described in more detail with reference to the accompanying Figures, in which
Fig. 1 is a schematic illustration of an arrangement for producing wound dressings, or pads, in accordance with one preferred embodiment of the invention;
Fig. 2 illustrates part of an anvil roll included in the arrangement shown in Fig. 1;
Fig. 3 is a schematic illustration of a wound dressing or pad manufactured by means of the arrangement shown in Fig. 1;
Fig. 4 is a sectioned view taken on the line IV-IV in Fig. 3; and
Fig. 5 is a sectioned view taken on the line V-V in Fig. 3.
Fig. 1 illustrates schematically an inventive arrangement for manufacturing wound dressings or pads. The arrangement includes an anvil roll 1 and an ultrasound horn 2 included in a typical ultrasound welding unit positioned above the periphery of the anvil roll and movable in a radial direction so as to enable a mean distance to be set between the periphery of the anvil roll and said horn 2. Although not shown, the arrangement also includes means for drawing a web of material 3 through the nip defined between the roll 1 and the horn 2. The web 3 is comprised of two webs of material, i.e. a web 4 of plastic film and a web 5 of absorbent material, said webs being taken from respective storage reels 6 and 7. The plastic film 4 may consist of polyethylene and the web 5 may consist of nonwoven material that includes absorbent fibres, such as viscose or cellulose fibres. An appropriate material in this regard is a spun laced polypropylene-viscose nonwoven material.
The two webs 4 and 5 are fastened to one another as they pass the horn 2 and the resultant combined web 3 is passed to a cutter 8 which cuts or punches-out individual pads 9 from the web 3.
Fig. 2 shows part of the anvil roll 1 in larger scale. As will be seen from Fig. 2, the periphery of the roll 1 includes rows of projections 10 that have curved outwardly facing surfaces 11 and vertical sides 12. By "outwardly facing surfaces" is meant the outer peripheral sides 11 of the projections 10, and by "vertical sides" is meant that the mutually opposing circle-segment shaped sides 12 of each projection are plane parallel with the plane of the paper in Fig. 1.
As the combined webs 4 and 5 pass the horn 2, the horn will press the webs 4, 5 against the periphery of the anvil roll as the horn moves up and down. It has been found that the plastic film that lies closest to the anvil roll 1 is cut by the opposing edges of the projections and that those web parts that lie outside these edges are then pressed down between said projections. At the same time, the side of the plastic layer that faces towards the web 5 will melt over the major part of the sides 12 of the projections 10. This re¬ sults in compression of the nonwoven material 5 in those parts of the material that lie between the outer sides of the projections and the horn. This compression remains when the individual dressings or pads are cut from the combined web 3. It has been found that an anvil roll that includes projections which have curved outer sides produces a larger fastening area between those parts of the plastic film that have been depressed by the projections and the underlying absorbent material than an anvil roll where the outwardly facing surface of respective projections is straight.
Figs. 3-5 illustrate a wound pad or dressing produced in accordance with the described method. The Figures show the dressing with that side of the dressing that lies against a wound when the pad is applied facing upwards. The dressing is comprised of a layer 4' of plastic film and a nonwoven layer 5' and includes mutually parallel rows of depressions 13 in the plastic layer and the underlying nonwoven layer. The depressions 13 have a hammock-like configuration in the plas- tic layer, as will best be seen from Fig. 5, and openings 14 perpendicular to the plane of the dressing are formed by the mutually separated cut surfaces of the plastic layer. The nonwoven material is compressed in the region of each depressions, as evident from Figs. 4 and 5. The layers 4' and 5' are also welded together within a greater part of the region of each depression.
Fluid, or liquid, absorbed in the absorbent material around the openings 14 will be quickly transported away therefrom, as a result of the smaller capillaries in the compressed parts of the absorbent layer 5'. In addition to favourable fluid transportation in the pad 9, there is also less risk of the openings 14 becoming blocked with solidified wound fluid than in the case of a dressing that lacks such compressed parts.
The dressing may conveniently be provided with a backing sheet of hydrophobic nonwoven material, such as polypropylene, for instance.
The wound dressing 9 can be sterilised by beta, steam or gas sterilising processes.
The described method can be used advantageously for the manu- facture of liquid-permeable outer sheets for absorbent arti-
cles such as sanitary napkins or diapers. In respect of such outer sheets, it is important that discharged liquid can be transported quickly away from the skin in order for the napkin or diaper to give the impression of being dry and also in order to reduce the risk of discharged liquid flowing along the surface of the plastic film.
It will be understood that the described and illustrated embodiment can be modified within the scope of the present invention. For instance, the wound dressing may include more than one layer of absorbent material, although the outer layers must contain melt fibres, such as polypropylene or polyester fibres. Materials other than nonwoven material can be used, such as absorbent foam material, for instance. Fur- ther ore, the rows of projections may conveniently extend obliquely to the axial direction of the anvil roll. The statement in Claim 5 to the effect that the rows of projections extend "essentially in an axial direction" will be understood to include rows that define an angle of up to 45° with said axial direction. The projections may have a curved shape different to that shown in the Figures. It will there¬ fore be understood that the invention is restricted solely by the contents of the following Claims.
Claims
1. An absorbent multilayer material (9) comprising a perforated layer (4') of hydrophobic material and at least one layer (5') of absorbent material, characterised by mutually sequential rows of depressions (13) disposed over one side of the material (9) that includes the hydrophobic layer (4'), wherein said depressions have the form of hammock-like parts of said hydrophobic layer that penetrate down into the layer of absorbent material (5') such as to form openings (14) which are perpendicular to the plane of said hydrophobic layer, and wherein said hammock-like parts are fastened to the absorbent layer over the major part of their respective surfaces; and is further characterised in that the absorbent layer is compressed in the region of each depression.
2. An absorbent multilayer material according to Claim 1, characterised in that the hydrophobic layer (4') is com¬ prised of plastic film and the absorbent layer (5') is com- prised of a nonwoven material that includes absorbent fibres.
3. An absorbent multilayer material according to Claim 2 or Claim 3, characterised in that the material includes several layers of nonwoven material, of which at least those layers which are not in contact with the hydrophobic layer include melt fibres.
4. An absorbent multilayer material according to Claim 1, characterised in that the absorbent layer is comprised of absorbent foam.
5. A method of producing an absorbent multilayer material, characterised by combining a layer (4) of weldable material with at least one layer (5) of absorbent material and passing the combined layers through the nip between an ultrasound horn (2) and an anvil roll (1) with the layer of weldable material (4) lying against said anvil roll, wherein said anvil roll is provided around its circumference with mutually sequential rows of discrete projections (10) having
5 curved outwardly facing surfaces (11) and vertical side surfaces (12), and wherein said rows extend essentially in an axial direction, and wherein said method is further characterised by setting the distance between the ultrasound horn and the anvil roll so that the weldable material will be cut w along the curved edges between the outwardly facing side surface (11) and the vertical side surfaces (12) of each projection while, at the same time, the combined layers (4, 5) are deformed within the region of each projection such as to form rows of depressions and such as to fasten the weld-
15 able layer (4) to the layer of absorbent material (5) within the major part of the region of each projection (10) .
6. A method according to Claim 5, characterised by combining several layers that include absorbent fibres to-
20 gether with said layer of weldable material, of which layers at least those layers that have no contact with the layer of weldable material also include melt fibres.
7. An arrangement for producing an absorbent multilayer 25 material that has one perforated side, characterised by means for combining at least two webs of material (4, 5) , means for passing the combined webs through the nip between an ultrasound horn (2) of an ultrasound welding unit and an anvil roll (1) that has circumferentially disposed sequential rows 30 of discrete projections (10) that have curved outwardly facing surfaces (11) and vertical side surfaces (12), said rows extending essentially in an axial direction, and by means (8) for cutting individual pieces from the web (3) subsequent to said web passing the ultrasound horn.
35
8. An arrangement according to Claim 7, characterised in that the vertical side surfaces (12) of the projections (10) have a circle-segmental shape.
9. An arrangement according to Claim 8, characterised in that the vertical side surfaces (12) of the projections (10) have a semi-circular shape.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9701869-1 | 1997-05-20 | ||
SE9701869A SE510799C2 (en) | 1997-05-20 | 1997-05-20 | Absorbent multilayer material and method and apparatus for making such |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998052505A1 true WO1998052505A1 (en) | 1998-11-26 |
Family
ID=20407003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/000898 WO1998052505A1 (en) | 1997-05-20 | 1998-05-14 | An absorbent multilayer material and a method and arrangement for its manufacture |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE510799C2 (en) |
WO (1) | WO1998052505A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1132071A2 (en) * | 2000-03-07 | 2001-09-12 | Uni-Charm Corporation | Absorbent article having multi-layered absorbent member |
WO2011040860A1 (en) * | 2009-09-30 | 2011-04-07 | Mölnlycke Health Care Ab | A method of attaching grip tabs to the carrier layer of a film dressing |
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US3934588A (en) * | 1974-08-20 | 1976-01-27 | Johnson & Johnson | Disposable diaper having facing layer with patterned preferential flow areas |
US3939033A (en) * | 1974-12-16 | 1976-02-17 | Branson Ultrasonics Corporation | Ultrasonic welding and cutting apparatus |
US4430148A (en) * | 1982-04-27 | 1984-02-07 | The Procter & Gamble Company | Ultrasonic bonding apparatus |
US4846813A (en) * | 1985-09-25 | 1989-07-11 | Kimberly-Clark Corporation | Self-sealing fluid absorbent article |
EP0489205A1 (en) * | 1990-12-04 | 1992-06-10 | Kang Na Hsiung Enterprise Co. Ltd. | An absorbent padding material |
EP0545423A1 (en) * | 1991-12-04 | 1993-06-09 | Uni-Charm Corporation | Body fluid absorbent article |
-
1997
- 1997-05-20 SE SE9701869A patent/SE510799C2/en not_active IP Right Cessation
-
1998
- 1998-05-14 WO PCT/SE1998/000898 patent/WO1998052505A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US3934588A (en) * | 1974-08-20 | 1976-01-27 | Johnson & Johnson | Disposable diaper having facing layer with patterned preferential flow areas |
US3939033A (en) * | 1974-12-16 | 1976-02-17 | Branson Ultrasonics Corporation | Ultrasonic welding and cutting apparatus |
US4430148A (en) * | 1982-04-27 | 1984-02-07 | The Procter & Gamble Company | Ultrasonic bonding apparatus |
US4846813A (en) * | 1985-09-25 | 1989-07-11 | Kimberly-Clark Corporation | Self-sealing fluid absorbent article |
EP0489205A1 (en) * | 1990-12-04 | 1992-06-10 | Kang Na Hsiung Enterprise Co. Ltd. | An absorbent padding material |
EP0545423A1 (en) * | 1991-12-04 | 1993-06-09 | Uni-Charm Corporation | Body fluid absorbent article |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1132071A2 (en) * | 2000-03-07 | 2001-09-12 | Uni-Charm Corporation | Absorbent article having multi-layered absorbent member |
EP1132071A3 (en) * | 2000-03-07 | 2004-08-18 | Uni-Charm Corporation | Absorbent article having multi-layered absorbent member |
AU779234B2 (en) * | 2000-03-07 | 2005-01-13 | Uni-Charm Corporation | Sanitary article having multi-layered absorbent member |
KR100740517B1 (en) * | 2000-03-07 | 2007-07-20 | 유니챰 가부시키가이샤 | Multi-structural absorption member of sanitary articles |
WO2011040860A1 (en) * | 2009-09-30 | 2011-04-07 | Mölnlycke Health Care Ab | A method of attaching grip tabs to the carrier layer of a film dressing |
US9486366B2 (en) | 2009-09-30 | 2016-11-08 | Mölnlycke Health Care Ab | Method of attaching grip tabs to the carrier layer of a film dressing |
Also Published As
Publication number | Publication date |
---|---|
SE510799C2 (en) | 1999-06-21 |
SE9701869D0 (en) | 1997-05-20 |
SE9701869L (en) | 1998-11-21 |
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