Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Reexamination Certificate
2005-09-20
2005-09-20
Ortiz, Angela (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
C264S045200, C264S051000
Reexamination Certificate
active
06946089
ABSTRACT:
The invention relates to a process and apparatus for producing a foamed body that allows simple control of the dimensions and gives foamed body with the desired dimensions in a stable manner. According to the invention, P2is pressure at the point where pressure in the die begins to fall after casting a molding material containing no blowing agent into the die, ΔP2is the amount of reduction in pressure in the die from P2, P3is the minimum pressure between the time of casting a molding material containing a blowing agent into the die completely cast and the time of beginning to increase the pressure in the die, ΔP3is the amount of increase in pressure in the die from P3, and ΔP4is the sum of ΔP2and ΔP3. A blowing agent and a molding material are cast into a pressure sensor-equipped die having a guide pin exposed on the inner wall of the die and in direct contact with the molding material and a pressure sensor which detects pressure inside the die via the guide pin, and ΔP4is controlled based on the correlation between the dimensional change and ΔP4for a previously obtained foamed body, in order to obtain foamed body with the desired dimensions.
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Koujina Junji
Mizouchi Hiroyuki
Morino Katsuaki
JSR Corporation
Ortiz Angela
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