# US 2019/0168465 A1 · Liquid-impermeable stitching method for seam of vapor-permeable virus-barrier fabric

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- Number: US 2019/0168465 A1
- Document ID: US20190168465A1
- Status: Published application
- Kind: A1
- Application number: 16/321,388
- Filed: 2016-08-08
- Published: 2019-06-06
- Earliest claimed: 2016-07-27
- Assignees: Foshan King Wonder Hi-Tech Co., Ltd.
- Applicants: Foshan King Wonder Hi-Tech Co., Ltd.
- Inventors: Yuwei LIN; Yaogen WU
- Web page: https://patentgrep.com/patent/US20190168465A1

## CPC

- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- A41D 13/1209: {Surgeons' gowns or dresses}
- A41D 27/245: {made by welding or gluing (joining of plastics by welding or gluing B29C65/00; sewing machines for concurrently making thread and welded seams D05B17/00; thermal or chemical fixing of seams and hems D06M)}
- B29C 65/02: by heating, with or without pressure
- B29C 66/112: {Single lapped joints}
- B29C 66/135: {Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area}
- B29C 66/1352: {Single hem to hem joints}
- B29C 66/43: {Joining a relatively small portion of the surface of said articles (B29C66/45 takes precedence)}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/723: {being multi-layered (B29C66/7292, B29C66/72941 take precedence)}
- B29C 66/7234: {comprising a barrier layer}
- B29C 66/729: {Textile or other fibrous material made from plastics}
- B29C 66/73182: {to gases}
- B29C 66/73187: {to liquids}
- B29C 66/73921: {characterised by the materials of both parts being thermoplastics}
- B29C 66/8322: {Joining or pressing tools reciprocating along one axis}
- B32B 5/022: {Non-woven fabric}
- B32B 5/08: the fibres or filaments of a layer being of different substances {, e.g. conjugate fibres, mixture of different fibres}
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 7/14: applied in spaced arrangements, e.g. in stripes
- B32B 27/02: in the form of fibres or filaments {(not used)}
- B32B 27/12: next to a fibrous or filamentary layer
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 33/00: Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
- B32B 37/04: characterised by the partial melting of at least one layer
- B32B 37/06: characterised by the heating method
- B32B 37/10: characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B 37/12: characterised by using adhesives
- B32B 37/15: with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- A41D 2300/52: made by welding or gluing
- A61B 46/40: {Drape material, e.g. laminates; Manufacture thereof}
- B29C 65/08: using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)}
- B29C 65/18: using heated tools
- B29C 65/38: Impulse heating
- B29C 65/8207: {by mechanical methods}
- B29C 65/8223: {Peel tests}
- B29C 66/73115: {Melting point}
- B29C 66/919: {characterised by specific temperature, heat or thermal flux values or ranges (specific electrical resistance values B29C66/81262)}
- B29C 66/91921: {in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature}
- B29C 66/91933: {higher than said fusion temperature}
- B29C 66/929: {characterized by specific pressure, force, mechanical power or displacement values or ranges}
- B29C 66/949: {characterised by specific time values or ranges}
- B29L 2031/48: Wearing apparel
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2255/02: on fibrous or filamentary layer
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2262/0253: Polyolefin fibres
- B32B 2262/0276: Polyester fibres
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/31: Heat sealable
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/724: Permeability to gases, adsorption
- B32B 2307/7265: Non-permeable
- B32B 2437/00: Clothing
- 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)
- A41D: OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A fluid impervious stitching method for a seam of a vapor-permeable virus-barrier laminate. The laminate comprises: at least one thermoplastic resin fiber layer; at least one vapor-permeable virus-barrier thermoplastic elastomer film layer; and a bonding layer located between the two layers and formed of an adhesive capable of being fused with the two layers. In the stitching method, overlapping or stacking is performed to form a seam, and heat sealing is performed on the laminate at the seam. The temperature of heat sealing is higher than the melting point of a material layer having the highest melting point in the laminate, but lower than the temperature at which perforation or decomposition occurs in any material layer in the laminate. The heat-stitched seam has excellent windproof, vapor-permeable, virus barrier and liquid-barrier performance, has a smooth appearance without wrinkles, and feels soft. Also provided is a protective textile product prepared by means of the stitching method.

## Claims

### Claim 1

A stitching method for making a fluid impervious seam at a vapor-permeable and virus-barrier laminate, wherein the laminate comprises a plurality of material layers:
at least one thermoplastic resin fiber layer with a gram weight of 1-500 g/m2;
at least one thermoplastic elastomer film layer with a thickness of 3-200 μm which is vapor-permeable and virus-barrier; and
a bonding layer formed between the thermoplastic resin fiber layer and the thermoplastic elastomer film layer by a glue which is capable of being fused with the thermoplastic resin fiber layer and the thermoplastic elastomer film layer with a gram weight of 0.1 g/m2 or more;
wherein, in said stitching method for forming a seam of a laminate, the part of the laminate to form a seam is overlapped or stacked to, and then is heat-sealed; wherein, the temperature of heat sealing is higher than or equal to the highest melting point of the material layers in the laminate, but lower than the temperature at which perforation or decomposition occurs in any material layer in the laminate.

### Claim 2 (depends on 1)

The stitching method according to claim 1, wherein the heat sealing causes all material layers to experience a certain extent of melting.

### Claim 3 (depends on 1)

The stitching method according to claim 1, wherein the heat sealing is conducted by performing thermal press at the overlapped or stacked portion of the laminate by means of a heat-stitching device to form a suture.

### Claim 4 (depends on 3)

The stitching method according to claim 3, wherein the heat sealing is conducted at a pressure of 0.001 to 1 MPa with a time of 0.01 to 600 s.

### Claim 5 (depends on 3)

The stitching method according to claim 3, wherein the thermal press device used for the heat sealing is a high frequency and pulse heat-sealing machine, a high temperature heat-sealing machine, or a roller sealing machine.

### Claim 6 (depends on 1)

A protective textile product in which a vapor-permeable and virus-barrier laminate is used and the stitching method of claim 1 is used to form a fluid impervious seam at the stitched portion of the laminate, wherein the laminate comprises:
at least one thermoplastic resin fiber layer with a gram weight of 1-500 g/m2, preferably of 5-200 g/m2, more preferably of 10-150 g/m2;
at least one thermoplastic elastomer film layer with a thickness of 3-200 μm which is vapor-permeable and virus-barrier; and
a bonding layer formed between the thermoplastic resin fiber layer and the thermoplastic elastomer film layer by a glue which is capable of being fused with the thermoplastic resin fiber layer and the thermoplastic elastomer film layer with a gram weight of 0.1 g/m2 or more.

### Claim 7 (depends on 6)

The protective textile product according to claim 6, wherein the thermoplastic resin fiber layer is selected from a group consisting of: fibers of polyester and its derivatives, fibers of polyamide and its derivatives, fibers of polyimide and its derivatives, fibers of polyurethane and its derivatives, fibers of polypropylene and its derivatives, fibers of polyethylene and its derivatives, fibers of polyvinyl alcohol and its derivatives, fibers of polyacrylonitrile and its derivatives, bio-based fibers, degradable fibers and their derivatives, or a textile product made of mixtures thereof.

### Claim 8 (depends on 6)

The protective textile product according to claim 6, wherein the thermoplastic elastomer film layer is selected from a group of a thermoplastic elastomer plastic and its derivatives and mixtures consisting of: polyvinyl acetate and its derivatives and mixtures, polyvinyl chloride and its derivatives and mixtures, polyvinyl alcohol and its derivatives and mixtures, polyethylene terephthalate and its derivatives and mixtures, and polybutylene terephthalate and its derivatives and mixtures, polyamide and its derivatives, amino resin and its derivatives and mixtures, unsaturated polyester resin and its derivatives and mixtures, epoxy resin and its derivatives and mixtures, organic silicone resin and its derivatives and mixtures.

### Claim 9 (depends on 6)

The protective textile product according to claim 6, wherein the gram weight of the bonding layer is from 0.8 to 50 g/m2, and the bonding layer is a non-continuous layer; preferably, the bonding layer is a non-continuous layer selected from a non-continuous dot layer, strip layer, or grid layer.

### Claim 10 (depends on 6)

The protective textile product according to claim 6, wherein the protective textile product is a garment or a consumable.