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US 4,626,183 AGranted
Apparatus for producing thermoplastic resin foam
AssigneeSekisui Kaseihin Kogyo Kabushiki Kaisha
InventorsHideharu Shirai, Yoshifumi Nakahara
Life of this patent
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Abstract
Apparatus including an extruder, a die member and a vacuum device connected in series. The vacuum device includes a chamber and a device at at least the outlet thereof to air-tightly seal the chamber around the extruded mass of foamed thermoplastic resin. The air-shielding or sealing device is an annular tube which is inflatable radially inwardly having a flexible inner face which seals around the extruded mass. A durable, abrasion-resistant, flexible protective sheet can be interposed between the mass and the tube.
Claims6
An apparatus for producing a thermoplastic resin foam comprising
- (a) an extruder;
- (b) a die member on said extruder;
- (c) a vacuum chamber airtightly connected to said die, said vacuum chamber member having a discharge end;
- and
- (d) an inflatable air-shielding means attached to at least the discharge end of said vacuum chamber, said air-shielding means comprising an annular, U-shaped cross-section frame attached to at least the discharge end of said vacuum chamber, said U-shaped cross-section frame having a base portion and two inwardly-directed portions defining an annular opening, a flexible sheet covering said opening and being air-tightly attached to said frame, a flexible protective means provided on and along a radial inner surface of said flexible sheet, and means for introducing pressurized fluid into said frame.
2 more elements
Dependencies are inferred from the claim text.