发明名称 |
Method for injection molding thick-walled articles |
摘要 |
Molten synthetic resin material containing foaming agent in an amount of 0.05 to 5 percent by weight is injected into a pre-pressurized mold cavity in a mold which is closed by a relatively low clamping force having a coefficient in the range of 10 to 40, said coefficient being represented as a ratio of clamping force to maximum injection shot volume. The above injection step is carried out for at least 3 seconds. After the injection step has been initiated, the pre-pressurized mold is released to atmosphere during the injection step at the soonest. At least two molds may be used to be alternately charged with said material.
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申请公布号 |
US4229395(A) |
申请公布日期 |
1980.10.21 |
申请号 |
US19780918694 |
申请日期 |
1978.06.23 |
申请人 |
ASAHI-DOW LIMITED |
发明人 |
NAGUMO, TADASHI;YASUIKE, AKIO;KATAOKA, HIROSHI |
分类号 |
B29C44/10;B29C45/04;(IPC1-7):B29D27/00;B29F1/06 |
主分类号 |
B29C44/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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