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
Patent
1993-11-01
1997-09-16
Oritz, Angela
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
264259, 2643287, B29C 4504, B29C 4510, B29C 4514
Patent
active
056677456
ABSTRACT:
A method for the integral molding of a thermoplastics top on the edge of a cardboard tube, the plasticized synthetic plastics material being injected into the mold cavity formed by inner and outer mold parts, the mold parts being pressed against each other with force. To produce relatively thin plastics parts with a high degree of dimensional accuracy in the very shortest time and by using simpler tools, the mold cavity in a first stage is maintained at a large volume during which the plasticized synthetic plastics material at least partially fills the mold cavity under a relatively low pressure, the mold cavity being in a second stage conveyed to a smaller volume than that of the first stage, the clamping force for pressing together the inner and outer mold parts being increased in the second stage in relation to that in the first stage.
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Oritz Angela
Tetra Laval Holdings & Finance S.A.
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