Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1994-09-30
1996-08-20
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 22, 264 405, 2643287, 425150, 425593, B29C 4580
Patent
active
055476198
ABSTRACT:
An injection compression molding method in which molten resin of a predetermined amount is injected into a mold cavity during or after a mold closing process. The molten resin is compressed by advancing a crosshead in a first direction to a predetermined stroke position to form a molded piece. Strain of the molded piece is relieved by moving the crosshead in a second direction, which is opposite the first direction, to a predetermined retracted position. The compressing step includes setting and storing a moving distance for each of stroke zones through which a movable portion of a mold clamping cylinder moves and a period required for the movable portion to move through the stroke zone, measuring a moving period of the movable portion for each of the stroke zones in a molding cycle, comparing the moving period of the movable portion with the corresponding preset period to obtain a difference between the periods for each stroke zone, and adjusting the flow rate of fluid supplied to the mold clamping cylinder to set the difference in period for each stroke zone to zero in the next molding cycle.
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patent: 4907960 (1990-03-01), Hertzer
patent: 5002706 (1991-03-01), Yamashita
patent: 5149471 (1992-09-01), Catanzaro et al.
patent: 5190714 (1993-03-01), Reinhart
patent: 5399303 (1995-03-01), Yamaguchi et al.
patent: 5417899 (1995-05-01), Kitamura
Heitbrink Jill L.
The Japan Steel Works Ltd.
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