# US 9,750,649 B2 · Nonwoven/film laminates

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- Number: US 9,750,649 B2
- Document ID: US9750649B2
- Status: Granted
- Kind: B2
- Application number: 13/013,469
- Filed: 2011-01-25
- Published: 2012-02-09
- Granted: 2017-09-05
- Earliest claimed: 2004-09-02
- Assignees: Rkw SE
- Applicants: Ludwig Börmann; Günter Schreiner
- Inventors: Ludwig Börmann; Günter Schreiner
- Web page: https://patentgrep.com/patent/US9750649B2

## CPC

- A61F 13/514: Backsheet, i.e. the impermeable cover or layer furthest from the skin {(A61F13/15211, A61F13/15252 take precedence)}
- B32B 5/022: {Non-woven fabric}
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 37/04: characterised by the partial melting of at least one layer
- B29C 66/7294: {Non woven mats, e.g. felt}
- B32B 37/08: characterised by the cooling method
- B32B 37/203: {One or more of the layers being plastic}
- B32B 38/0012: {Mechanical treatment, e.g. roughening, deforming, stretching}
- B32B 2250/02: 2 layers
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2305/20: in the form of a non-woven mat
- B32B 2307/51: Elastic
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/7265: Non-permeable
- B32B 2309/02: Temperature
- B32B 2555/00: Personal care
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/31504: Composite [nonstructural laminate]
- Y10T 442/674: Nonwoven fabric with a preformed polymeric film or sheet
- Y10T 442/678: Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]
- 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 (dental prosthetics A61C)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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 (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a method for producing nonwoven/film laminates for personal hygiene articles, from an initial film web consisting of a thermoplastic polymer and an initial nonwoven web. According to said method, the initial film web and the initial nonwoven web, whose melting point lies above the crystallite melting point of the polymer, are heated to a temperature that exceeds the crystallite melting point of the polymer and lies below the melting point of the initial nonwoven web. The laminate is then guided through a cooled nip and is cooled to a temperature that lies below the crystallite melting point of the initial film web. The invention also relates to laminates that can be produced by said method.

## Claims

### Claim 1

A method for the production of nonwoven-film laminates useful as a backsheet for personal hygiene articles, the method comprising:
a) providing a film web made of at least one thermoplastic polymer;
b) providing a nonwoven web, wherein the nonwoven web has a melting point in excess of the crystallite melting point of the thermoplastic polymer;
c) jointly heating the film web and the nonwoven web to a temperature above the crystallite melting point of the thermoplastic polymer and below the melting point of the nonwoven web, in order to heat the entire film web to at least a molten state of the thermoplastic polymer and form the nonwoven-film laminate; and
d) guiding the nonwoven-film laminate through a cooled nip in order to cool the nonwoven-film laminate below the crystallite melting point of the film web,
wherein the heating comprises heating the film web and the nonwoven web with a heating cylinder and further heating the film web and the nonwoven web with another heating method so that the film web is heated to the molten state.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the other heating method comprises heating with radiant heat.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the other heating method comprises heating with an infrared radiator.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the cooled nip is formed by a stamping roller and a rubber roller, wherein the embossed texture of the stamping roller reduces the degree of gloss of the laminate.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the cooled laminate is subjected to a stretching step in machine direction or crossways direction or in machine direction and crossways direction.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the film web is blow-extruded.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the film web is printed following extrusion but prior to lamination.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the film web is stretched in machine direction or crossways direction or in machine direction and crossways direction.

### Claim 9 (depends on 1)

The method of claim 1, wherein the nonwoven web is in direct contact with the heating cylinder.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the film web further comprises a filler material.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the filler material is chalk.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the film web comprises a second thermoplastic polymer, wherein the second thermoplastic polymer has a melting point in excess of the crystalline melting point of the thermoplastic polymer.