Patent US5258160A successfully refreshed from Google Patents.
US5258160A
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Process and apparatus for producing elongated body of elastic modulus changing type
Assignee: Mitsubishi Cable Industries Ltd
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Filing: 1992-08-11
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Granted: 1993-11-02
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Expires: 2012-08-11
Abstract
Abstract A process and apparatus for producing an elongated body changing in elastic modulus longitudinally thereof with use of polymers without resulting in variations in the outside and inside diameters of the body even when the polymers are different in extrusion characteristics or swelling characteristics. The apparatus may include a feeder 1 for extruding a first polymer in a molten state and a feeder 2 for extruding a second polymer, which is different from the first polymer in elastic modulus and similarly in a molten state. The feeders alternately discharge the respective polymers, which are continuously fed to a long-land die 5 along with a lubricant supplied from a lubricant applicator 4. The polymers are formed into the desired shape and cooled in the die 5, and thereafter extruded.
Inventors
- 👤 Atsushi Utsumi
- 👤 Masaaki Ohtsuji
- 👤 Motohiko Yamasaki
- 👤 Tamotsu Kaide
- 👤 Kazuo Onishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:02
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0043; A61M25/0054; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/11; B29C48/12; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/36; B29C48/49; B29C48/94; A61M25/0009
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
178 words
A process for producing an elongated polymeric body of an elastic modulus changing type said process comprising: a first step of continuously feeding an amount of a first polymer to a long-land die having a forming zone in an inlet portion and a cooling zone in an outlet portion, the die having an inner surface supplied with a lubricant, a second step of continuously feeding an amount of the first polymer at a first feeding rate and an amount of a second polymer which has an elastic modulus different from the elastic modulus of the first polymer at a second feeding rate to the long-land die, under conditions where the second feeding rate of the second polymer gradually increases and the first feeding rate of the first polymer gradually decreases while the sum of the amount of the first polymer and the amount of the second polymer is constant, so as to form mixtures of the first polymer and the second polymer, a third step of continuously feeding an amount of the second polymer to the long-land die.
Claim 2
Dependent Claim
178 words
A process for producing an elongated polymeric body of an elastic modulus changing type said process comprising: a first step of continuously feeding an amount of a first polymer to a long-land die having a forming zone in an inlet portion and a cooling zone in an outlet portion, the die having an inner surface supplied with a lubricant, a second step of continuously feeding an amount of the first polymer at a first feeding rate and an amount of a second polymer which has an elastic modulus different from the elastic modulus of the first polymer at a second feeding rate to the long-land die, under conditions where the second feeding rate of the second polymer gradually increases and the first feeding rate of the first polymer gradually decreases while the sum of the amount of the first polymer and the amount of the second polymer is constant, so as to form mixtures of the first polymer and the second polymer, a third step of continuously feeding an amount of the second polymer to the long-land die.
Claim 3
Dependent Claim
33 words
A process as defined in claim 1 wherein in addition to said first and second polymers, a skin layer polymer is continuously fed to the outermost layer of the polymers within the die.
Claim 4
Dependent Claim
29 words
A process as defined in claim 2 wherein the skin layer polymer is the same as one of said first and second polymers which are different in elastic modulus.
Claim 5
Dependent Claim
25 words
A process as defined in claim 1 wherein the polymers of different elastic moduli have a melt viscosity ratio therebetween of 1: up to 2.
Claim 6
Dependent Claim
28 words
A process as defined in claim 1 wherein the combined rate of feed of said first and second polymers to the long-land die is constant at all times.
Claim 7
Dependent Claim
50 words
A process as defined in claim 1 wherein means is used for adjusting the rate of change-over from one of the polymers to the other polymer for feeding to the long-land die to thereby form an elastic modulus changing portion of controlled length in the elongated body to be extruded.
Claim 8
Dependent Claim
33 words
A process as defined in claim 1 wherein the outside diameter of the elongated body to be extruded is adjusted by controlling the rate of supply of the lubricant to the long-land die.
Claim 9
Dependent Claim
35 words
A process as defined in claim 1 wherein a fluid for forming a hollow portion is supplied to the long-land die together with the polymer to be fed with the fluid enclosed in the polymer.
Claim 10
Dependent Claim
16 words
A process as defined in claim 8 wherein the fluid is water or a water-soluble liquid.
Claim 11
Dependent Claim
25 words
A process as defined in claim 8 wherein the diameter of the hollow portion is adjusted by controlling the rate of supply of the fluid.
Claim 12
Independent Claim
144 words
An apparatus for producing an elongated polymeric body of an elastic modulus changing type, the apparatus comprising a first extruder for feeding a first polymer having an elastic modulus, a second extruder for feeding a second polymer having an elastic modulus different from the elastic modulus of the first polymer, a long-land die connected to the first extruder and the second extruder, said long-land die having forming zone for forming polymers fed thereto into an outer body and a cooling zone for solidifying polymers formed in the forming zone, said cooling zone having a function for cooling the polymers until the cooling substantially becomes unnecessary after the polymer are extruded out of the long-land die, means for alternately feeding polymers from the first and second polymer extruders to the long-land die, and means for supplying a lubricant to inner surface of the long-land die.
Claim 13
Independent Claim
144 words
An apparatus for producing an elongated polymeric body of an elastic modulus changing type, the apparatus comprising a first extruder for feeding a first polymer having an elastic modulus, a second extruder for feeding a second polymer having an elastic modulus different from the elastic modulus of the first polymer, a long-land die connected to the first extruder and the second extruder, said long-land die having forming zone for forming polymers fed thereto into an outer body and a cooling zone for solidifying polymers formed in the forming zone, said cooling zone having a function for cooling the polymers until the cooling substantially becomes unnecessary after the polymer are extruded out of the long-land die, means for alternately feeding polymers from the first and second polymer extruders to the long-land die, and means for supplying a lubricant to inner surface of the long-land die.
Claim 14
Dependent Claim
37 words
An apparatus as defined in claim 11 wherein confluent means is provided for joining together the polymers discharged from the respective polymer feeding means, and the polymers are fed to the long-land die through the confluent means.
Claim 15
Dependent Claim
22 words
An apparatus as defined in claim 12 wherein the lubricant supplying means is disposed between the confluent means and the long-land die.
Claim 16
Dependent Claim
42 words
An apparatus as defined in claim 12 wherein the confluent means has a confluent channel, one of the polymers is supplied to the confluent channel in alignment therewith, and the other polymer or polymers are supplied to the confluent channel from therearound.
Claim 17
Dependent Claim
42 words
An apparatus as defined in claim 12 wherein the long-land die is provided at an inlet portion thereof with an outside diameter adjusting portion having a tapered inner peripheral wall for adjusting the outside diameter of the elongated body to be produced.
Claim 18
Dependent Claim
32 words
An apparatus as defined in claim 12 wherein fluid supply means for enclosing a fluid in the polymers is provided in a polymer channel between the confluent means and the long-land die.
Claim 19
Dependent Claim
17 words
An apparatus as defined in claim 16 wherein the fluid supply means has a plurality of nozzles.
References Cited (Backward Citations)
DE32869C
Cited
US2620515A
Cited
US3752617A
Cited
US4056344A
Cited
US3928525A
Cited
US3724985A
Cited
US4091064A
Cited
US4198363A
Cited
US4211741A
Cited
JPS548036A
Cited
JPS54151614A
Cited
US4276250A
Cited
US4394338A
Cited
WO1988003421A1
Cited
US4753765A
Cited
US4636346A
Cited
EP0294337A1
Cited
US4888146A
Cited
JPH0230265A
Cited
US4904431A
Cited
JPH0393523A
Cited
US5059375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-01 | 1997-05-03 | 1997-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-01 | 2001-05-03 | 2001-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-01 | 2005-05-03 | 2005-11-02 | $7700.00 | Window Closed / Lapsed |