发明名称 |
Process and apparatus for extruding plastic foams through a fluorocarbon lined die shaping means having extended wear characteristics |
摘要 |
In a method for producing a plastic foam of a desired expanded dimension which is constituted by extruding a melt of a thermoplastic synthetic resin containing a blowing agent through a die of an extruder and passing the extrudate through a shaping device located outwardly of the extruder and secured to the discharge end of the extruder while expanding and solidifying the molten mass so that it fills the shaping device; the improvement wherein at least a part of that area of the inside surface of the shaping device with which the expanded resin makes contact is formed of a plate of a fluorocarbon resin, said plate being secured to the inside surface of the shaping device by fitting portions, said fitting portions having a sufficient space for absorbing an increase in the volume of the fluorocarbon resin plate at the temperature of extrusion molding; and an apparatus for use in the above described process.
|
申请公布号 |
US4324748(A) |
申请公布日期 |
1982.04.13 |
申请号 |
US19800189944 |
申请日期 |
1980.09.22 |
申请人 |
JAPAN STYRENE PAPER CORPORATION |
发明人 |
HATAKEYAMA, HIDEO;YAMAMOTO, TORU |
分类号 |
B29C33/40;B29C44/50;B29C47/12;B29C47/90;(IPC1-7):B29D27/00;B29C1/04 |
主分类号 |
B29C33/40 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|