Patent US4025274A successfully refreshed from Google Patents.
US4025274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for preparing thermoplastic resin composition
Assignee: Tosoh Corp
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Filing: 1976-05-21
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Granted: 1977-05-24
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Expires: 1996-05-21
Abstract
Abstract The present invention is concerned with a method and apparatus which blend components of a thermoplastic resin composition in an extruder having a cylindrical body, a screw, and a heating means, wherein the cylindrical body has a large bore part, a tapered part, and a small bore part, and the screw has a large diameter flight, a tapered flight, and a small diameter flight which is fitted within the cylindrical body. The tapered flight has free pass recesses, if desirable, and the roughness of the inner surface of the cylindrical body and/or roughness of the outer surface of the flight of screw are decreased as one proceeds in the direction from the small bore part to the outlet.
Inventors
- 👤 Masaru Uemura
- 👤 Tadashi Kasamatsu
- 👤 Toshimitsu Akiyama
- 👤 Hitoshi Kuroki
- 👤 Yujiro Kosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:31
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/50; B29C48/505; B29C48/59; B29C48/60; B29C48/03
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
81 words
An extruder for extruding a thermoplastic resin composition, including a cylindrical body, a screw disposed within said body and heating means disposed about said body, the improvement which comprises: the cylindrical body has a large bore part, a tapered part, and a small bore part, the screw has a large diameter flight, a tapered flight, and a small diameter flight which is rotatably disposed within said cylindrical body, and a plurality of free pass recesses are formed upon said tapered flight.
Claim 2
Dependent Claim
81 words
An extruder for extruding a thermoplastic resin composition, including a cylindrical body, a screw disposed within said body and heating means disposed about said body, the improvement which comprises: the cylindrical body has a large bore part, a tapered part, and a small bore part, the screw has a large diameter flight, a tapered flight, and a small diameter flight which is rotatably disposed within said cylindrical body, and a plurality of free pass recesses are formed upon said tapered flight.
Claim 3
Dependent Claim
31 words
The extruder according to claim 1, wherein: the ratio of the depth of the free pass recesses to the height of the tapered flight is in a range of 0.2- 0.9.
Claim 4
Dependent Claim
31 words
The extruder according to claim 1, wherein: the ratio of the area of the free pass recesses to the area of the tapered flight is in a range of 1- 20%.
Claim 5
Dependent Claim
32 words
The extruder according to claim 1, wherein: the ratio of the diameter of the large bore part to the diameter of the small bore part is in a range of 1:1.1- 3.0.
Claim 6
Dependent Claim
26 words
The extruder according to claim 1, wherein: the vertical angle of the tapered part of the cylindrical body is in a range of 2- 12 degrees.
Claim 7
Dependent Claim
28 words
The extruder according to claim 1, wherein: at least one longitudinal free pass groove is formed upon the inner surface of said tapered part of said cylindrical body.
Claim 8
Dependent Claim
28 words
The extruder according to claim 1, wherein: the screw pitches of the screw in the tapered flight are larger than the screw pitches in the small diameter flight.
Claim 9
Dependent Claim
42 words
The extruder according to claim 1 further comprising: means disposed at the outlet of said device for suppressing a flow of a molten mixture so as to impart compression in the small bore part, the tapered part, and the large bore part.
Claim 10
Dependent Claim
28 words
The extruder according to claim 1, wherein: the roughness of the inner surface of the cylindrical body is different from the roughness of the surface of the screw.
Claim 11
Dependent Claim
29 words
The extruder according to claim 1, wherein: the roughness of the inner surface of the cylindrical body is decreased from the large bore part to the small bore part.
Claim 12
Dependent Claim
53 words
The extruder according to claim 1, wherein: plural screw type grooves, whose screw direction is opposite that of the large diameter flight, are formed upon the inner surface of said cylindrical body; and a rough surface is formed by knurling on the inner surface of the large bore part of the cylindrical body.
Claim 13
Dependent Claim
76 words
The extruder according to claim 1, wherein: the roughness of the inner surface of the tapered part adjacent to the small bore part is in a range of 100- 32 Z of R z ; and the roughness of the inner surface of the small bore part at the outlet is in a range of 16- 6.3 Z of R z , the roughness of the small bore part also being decreased in the flow direction.
Claim 14
Dependent Claim
98 words
A process for preparing a thermoplastic resin composition comprising a thermoplastic resin and additives, comprising: uniformly blending the composition within an extruder having a cylindrical body, a screw disposed in said body and heating means disposed about said body, the cylindrical body having a large bore part, a tapered part, and a small bore part, and the screw has a large diameter flight, a tapered flight, and a small diameter flight which is disposed within the cylindrical body, the tapered flight having free pass recesses; and feeding back a part of the mixture through the free pass recesses.
Claim 15
Dependent Claim
98 words
A process for preparing a thermoplastic resin composition comprising a thermoplastic resin and additives, comprising: uniformly blending the composition within an extruder having a cylindrical body, a screw disposed in said body and heating means disposed about said body, the cylindrical body having a large bore part, a tapered part, and a small bore part, and the screw has a large diameter flight, a tapered flight, and a small diameter flight which is disposed within the cylindrical body, the tapered flight having free pass recesses; and feeding back a part of the mixture through the free pass recesses.
Claim 16
Dependent Claim
46 words
The process for preparing a thermoplastic resin composition according to claim 13, wherein: a mixture of components of a hot melt thermoplastic resin composition is blended by feeding back a part of the mixture through the free opening recess of the tapered flight of the screw.
Claim 17
Dependent Claim
75 words
The process for preparing a thermoplastic resin composition according to claim 13, wherein: a mixture of components of a hot melt thermoplastic resin composition is forced from the large diameter flight through the tapered flight, and to the small diameter flight as a result of a variation in the roughness of the outer surface of the screw and/or the inner surface of the cylindrical body in the direction proceeding from the inlet to the outlet.
Claim 18
Dependent Claim
55 words
The process for preparing a thermoplastic resin composition according to claim 13, wherein: a mixture of components of a hot melt thermoplastic resin composition is blended by feeding back a part of the mixture through the free opening recesses formed on the tapered flight and grooves formed on the tapered part of said cylindrical body.
References Cited (Backward Citations)
US2632203A
Cited
US3745200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |