# US 11,077,642 B2 · Hot press cushioning material

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- Number: US 11,077,642 B2
- Document ID: US11077642B2
- Status: Granted
- Kind: B2
- Application number: 15/714,535
- Filed: 2017-09-25
- Published: 2018-01-18
- Granted: 2021-08-03
- Earliest claimed: 2012-08-17
- Assignees: Yamauchi Corporation
- Applicants: Yamauchi Corporation
- Inventors: Takamitsu Ozeki; Akira Yoshida
- Web page: https://patentgrep.com/patent/US11077642B2

## CPC

- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B30B 15/061: {Cushion plates}
- B32B 5/022: {Non-woven fabric}
- B32B 5/06: characterised by a fibrous {or filamentary} layer {mechanically connected, e.g. by needling} to another layer, e.g. of fibres, of paper
- D04H 1/4342: Aromatic polyamides
- D04H 1/4374: using different kinds of webs, e.g. by layering webs
- D04H 1/498: entanglement of layered webs
- B29C 43/20: Making multilayered or multicoloured articles {(B29C43/14 takes precedence)}
- B29C 2043/3657: {additional materials, e.g. permeable bleeder or breather sheets, cloths, blankets}
- B32B 2250/03: 3 layers
- B32B 2250/20: All layers being fibrous or filamentary
- B32B 2262/0269: Aromatic polyamide fibres
- B32B 2307/306: Resistant to heat
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2457/08: PCBs, i.e. printed circuit boards
- B32B 2457/202: LCD, i.e. liquid crystal displays
- Y10T 428/24942: including components having same physical characteristic in differing degree
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)}
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- 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

A hot press cushioning material includes: a first nonwoven fabric forming an inner layer; and second nonwoven fabrics placed on both surfaces of the first nonwoven fabric and forming outer layers. Copolymerized para-aramid fibers having a basis weight of 80 to 400 g/m2 are used as a material of the second nonwoven fabrics. Fibers that are more rigid than the copolymerized para-aramid fibers are used as a material of the first nonwoven fabric. Each of the first nonwoven fabric and the second nonwoven fabrics has a heat resistant temperature of 270° C. or more.

## Claims

### Claim 1

A hot press cushioning material for a hot press, comprising:
a first nonwoven fabric forming an inner layer; and
second nonwoven fabrics needle punched to both surfaces of said first nonwoven fabric and forming surface layers, wherein:
each second nonwoven fabric having an inner surface facing the first nonwoven fabric and an outer surface, and the outer surfaces of the second nonwoven fabrics are substantially planar,
said first nonwoven fabric including poly-(p-phenylene terephthalamide) fiber as a material of said first nonwoven fabric,
said second nonwoven fabrics including co-poly-(paraphenylene/3,4′-oxydiphenylene terephthalamide) fiber as a material of said second nonwoven fabrics, having a basis weight of 80 to 400 g/m2,
said first nonwoven fabric and said second nonwoven fabric have a heat resistant temperature of 270° C. or more,
a rigidity of the first nonwoven fabric is greater than a rigidity of said second nonwoven fabric, and
a basis weight of the first nonwoven fabric is larger than the basis weight of the second nonwoven fabrics.