Forming deep articles having relatively balanced molecular orientation
Abstract
Abstract A method of forming articles having relatively balanced molecular orientation from substantially amorphous thermoplastic sheet material. The sheet material is forced by means of a plug in an axial direction while at a temperature within a range at which rubbery flow of the thermoplastic occurs to partially form the article while developing a limited amount of orientation in the axial direction. The thus forced material is held in contact with a temperature conditioned surface to reduce its temperature to one which is above the glass transition temperature of the material and is within a range whereat the ratio of modulus to temperature is greater than 1 in a plot of modulus of the material versus temperature. Then the material is expanded outwardly against the walls of a mold cavity while within said latter temperature range to develop radial orientation and finish form the article.
Inventors
- 👤 W Wolf
Bibliographic Details
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