Method for forming convex non-extractable formed pieces made of

Details Method for forming convex non-extractable formed pieces made of Method for forming convex non-extractable formed pieces made of

1990-11-30

1992-09-29

Heitbrink, Tim

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264315, B29C 4318

Patent

active

051512360

ABSTRACT:
In order to form shaped convex non-extractable pieces made of a composite material, a partially polymerized (stage B) preform strip (10) is placed in a forming tool (16) along a cylindrical surface having one rectilinear generator and one convex directrix curve whose shape coincides with the shape of the piece to be embodied. The particular section of the piece is obtained with the aid of an inflatable bladder (22) pressing the preform strip against a forming die (24). In this way, the area contractions are kept to a minimum, which avoids may undulations of the fibers and any falling off of the mechanical characteristics of the pieces which may accordingly arise.

REFERENCES:
patent: 4126659 (1978-11-01), Blad
patent: 4657717 (1987-04-01), Cattanach
patent: 4808362 (1989-02-01), Freeman
patent: 4816203 (1989-03-01), Son-Kung

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