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Vacuum Forming of Plastics or Metals by using a Microporous Mold

IP.com Disclosure Number: IPCOM000092958D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Wood, RN: AUTHOR

Abstract

In vacuum thermoforming materials, such as thermoplastics, the thermoforming molds are fashioned by machining, assembling, or the casting of metal or plastics. For exhausting air when the mold is put under vacuum, numerous holes are drilled in the mold.

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Vacuum Forming of Plastics or Metals by using a Microporous Mold

In vacuum thermoforming materials, such as thermoplastics, the thermoforming molds are fashioned by machining, assembling, or the casting of metal or plastics. For exhausting air when the mold is put under vacuum, numerous holes are drilled in the mold.

If the mold is formed of a microporous, ceramic material or of a rigid, open cell foam, the open cells, or microporosity, serve as the exhaust holes. Thus it is no longer necessary to drill holes in the mold. In addition, there are an infinite number of exhaust holes formed by the open cells, or microporosity. This results in better conformity of the thermoplastic material to the mold shape than with a mold having substantially less drilled exhaust holes.

This type of mold can be quickly made by casting a microporous ceramic, or by foaming the molds over a master having a shape which is desired for the material to be vacuum thermoformed.

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