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 Title: |
US4248579:
Film extrusion die
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Maejima, Mokichi; Tokyo, Japan
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| Assignee: |
Jyohoku Seiko Co., Ltd., Tokyo, Japan
other patents from JYOHOKU SEIKO CO., LTD. (299570) (approx. 4)
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| Published / Filed: |
1981-02-03
/ 1979-10-10
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| Application Number: |
US1979000083444
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| IPC Code: |
Advanced:
B29C 47/08;
B29C 47/16;
IPC-7:
B08B 1/00;
B29D 7/04;
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| ECLA Code: |
B29C47/08X; B29C47/16;
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| U.S. Class: |
Current:
425/227;
015/248.1;
030/169;
264/039;
264/169;
264/176.1;
425/381;
425/466;
Original:
425/227;
015/236.R;
015/248.R;
030/169;
264/039;
264/169;
264/176.R;
425/381;
425/466;
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| Field of Search: |
425/466,381,151,458,87,225,227,229
264/169,176 R,39
015/236 R,248 R
030/169
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| Priority Number: |
| 1979-10-10 |
US1979000083444 |
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| Abstract: |
A T-shaped extrusion die for forming transparent, uniformly thick and edge beads-free synthetic resins with a high efficiency, comprising a die body having a manifold for containing a supply of the synthetic resin in molten state and a slot-like passage for the molten resin, adjustable lips for forming a slot-like discharge orifice, inner deckles useful mainly for varying the edge thickness of the resulting extruded film, support rods for supporting the inner deckles, and inner deckle rods for regulating the width of the resulting extruded film, the inner deckles being moved by moving the support rods in the manifold in sliding contact with the surface thereof to vary the edge thickness of the resulting film, the inner deckle and inner deckle rod being kept somewhat away from each other thereby to permit free movement of the latter even under a high molten resin pressure. In one embodiment, a remover for an oxidized or scorched resin is disclosed.
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| Attorney, Agent or Firm: |
Jordan and Hamburg ;
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| Primary / Asst. Examiners: |
Thurlow, Jeffery R.;
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| Family: |
None
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First Claim:
Show all 6 claims |
What is claimed is:
1. In a T-shaped extrusion die for extruding films of thermally flowable synthetic resin at a high pressure, comprising (1) a die body having a manifold for containing a supply of the synthetic resin in molten state and a slot-like passage for passing the molten synthetic resin towards a slot-like discharge orifice, (2) adjustable lips for forming the slot-like discharge orifice of any desired size between their lower ends, (3) inner deckles for varying the edge thickness of the resulting extruded film, movable perpendicularly to the resin flow and within the slot-like passage at the end portion of the die body, respectively, and (4) inner deckle rods for regulating the width of the resulting extruded film, movable below the inner deckles in conjunction therewith, parallel to the moving directions of the inner deckles and within the slot-like passage at the end portions of the die body, respectively,
- said extrustion die characterized in that one of the inner deckles being securely connected to, and supported by, a support rod extending through the manifold beyond one end of the die body and provided at the outer end with a support rod-power driving device for moving the support rod in sliding contact with the surface of the manifold, the other being securely connected to, and supported by, a similar support rod extending through the manifold beyond the other end of the die body and provided at the outer end with a support rod-operating device for moving the other support rod in sliding contact with the surface of the manifold, the support rod-power driving device being manually operable or remote-operable at the side of the support rod-operating device, and the inner deckle and the mating inner deckle rod being kept a predetermined distance away from each other thereby to permit the latter to move easily without being closely contacted with the former during the high-pressure extruding operation.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
Show drawing descriptions
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| Description: |
Show description
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| Forward References: |
Show 18 U.S. patent(s) that reference this one
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