The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2005
Filed:
Jun. 13, 2001
Hiroyuki Mizouchi, Tokyo, JP;
Katsuaki Morino, Tokyo, JP;
Junji Koujina, Tokyo, JP;
JSR Corporation, Tokyo, JP;
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, Pis pressure at the point where pressure in the die begins to fall after casting a molding material containing no blowing agent into the die, ΔPis the amount of reduction in pressure in the die from P, Pis 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, ΔPis the amount of increase in pressure in the die from P, and ΔPis the sum of ΔPand ΔP. 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 ΔPis controlled based on the correlation between the dimensional change and ΔPfor a previously obtained foamed body, in order to obtain foamed body with the desired dimensions.