[특허]Compressing and shaping thermoformable mats using superheated steam

Compressing and shaping thermoformable mats using superheated steam 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B29C-051/00
출원번호	US-0274573 (1988-11-23)
발명자 / 주소	Elliott George M. (Alpharetta GA)
출원인 / 주소	Astechnologies, Inc. (Roswell GA 02)
인용정보	피인용 횟수 : 24 인용 특허 : 0

초록 ▼

A thermoformable mat, e.g., a mat of resinated fiberglass, is compressed and shaped into a contoured object, e.g., a shell for an automobile headliner, by this process. The mat is compressed between two dies that have been preheated. At least one of the dies is perforated. Superheated steam (e.g., at 80 psig and 600°F.) is ejected from the perforations into the mat, thereby quickly raising the mat temperature to its thermoforming point. After the mat is set into the contoured shape, the dies are reopened and the formed mat is removed. If the mat that is used contains a thermoplastic adhesive, the mat is cooled to below the adhesive\s melt print before the dies are opened. This can be done by applying a vacuum to the perforated die and pulling ambient air through the mat.

대표청구항 ▼

A process of forming a porous, thermoformable mat into a desired shape and making the mat less flexible and resilient comprising the following steps: a) placing a porous thermoformable mat which can be formed and made less flexible and resilient by being heated under pressure to its thermoforming temperature between a pair of complementary, contoured dies, which, when brought fully together, define in a space between them a desired shape of the formed mat, each of said dies having a perforated contact surface and an enclosed chamber behind said contact surface, both said dies being preheated to an elevated temperature; b) introducing superheated steam under pressure through a supply valve into the chamber of said first die while said mat is between said dies, so that the steam passes through the perforations in the first die\s contact surface and penetrates the mat, the pressure of the steam on the upstream side of the supply valve being at least about 30 psig, the temperature of the steam being high enough to heat the mat to its thermoforming temperature, and applying a vacuum to the chamber in the second die while the superheated steam is introduced to the chamber in the first die, so as to help pull the steam through the mat, the volume of said vacuum not substantially exceeding the volume of the steam introduced to the chamber in the first die; c) bringing the dies fully together, thereby compressing the mat between the dies, said compressing occurring while the mat is at its thermoforming temperature; d) halting the steam introduction; e) maintaining the die compression on said mat until the mat is substantially completely thermoformed into the desired shape; f) separating said dies after the mat is substantially completely thermoformed; and g) removing the mat from between said dies.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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Compressing and shaping thermoformable mats using superheated steam 원문보기

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Compressing and shaping thermoformable mats using superheated steam 원문보기

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