US3868436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of electrical conductors covered with crosslinked material
Assignee: Mitsubishi Chemical Corp
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Filing: 1972-12-15
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Granted: 1975-02-25
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Expires: 1992-12-15
Abstract
Abstract In the production of cables covered with a cross-linked material by feeding a conductor and a cross-linkable material covering the conductor through a long land portion of an extruding die unit, the length and the operational temperature in the land portion being selected so that the cross-linking reaction is substantially completed within the land portion, and cooling the cross-linked material within a cooling device housing a pressurized cooling fluid therein, an improved process within the aforementioned feeding of the conductor is carried out under a braking force counteracting a pull generated along the cable by the pressurized cooling fluid.
Inventors
- 👤 Masaaki Ootsuji
- 👤 Masatake Matsui
- 👤 Masaru Fuwa
- 👤 Kiyoshi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:09
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B13/145; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/06; B29C48/15; B29C48/25; B29C48/88; B29C48/91; B29C48/911; B29C48/9135; B29C48/915; B29C48/916; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92704; B29C2948/92819; B29C2948/92923; B29C48/05; B29K; B29K2101/00; B29K2101/10; B29K2105/00; B29K2105/24; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
IN A PROCESS FOR PRODUCING A CABLE COVERED WITH A CROSSLINKED MATERIAL, COMPRISING EXTRUDING A CROSS-LINKABLE MATERIAL ONTO A CONDUCTOR WHICH IS CONTINUOUSLY PASSED THROUGH A LONG-LAND PORTION OF AN EXTRUDING DIE UNIT AND SUBSEQUENTLY THROUGH A COOLING DEVICE DIRECTLY CONNECTED TO THE EXIT OF SAID EXTRUDING DIE UNIT, FORMING AND VULCANIZING SAID CROSS-LINKABLE MATERIAL THROUGH SAID LONG-LAND PORTION, AND COOLING SAID VULCANIZED MATERIAL ON SAID CONDUCTOR BY PRESSURIZED COOLING FLUID UNDER A PRESSURE P OF 1-30 KG/CM2 IN SAID COOLING DEVICE, WHICH PRESSURE EXERTS AN IRREGULAR PULLING FORCE ALONG THE LENGTH OF SAID CABLE THE IMPROVEMENT COMPRISING APPLYING A BRAKING FORCE T(KG) TO A PORTION OF SAID CONDUCTOR AND IN THE DIRECTION OPPOSITE TO THE MOVING DIRECTION OF SAID CONDUCTOR PRIOR TO SAID CONDUCTOR ENTERING THE EXTRUDER-CROSSHEAD; SAID BRAKING FORCE T BEING DETERMINED FROM THE FOLLOWING RELATIONSHIP:
Claim 2
Dependent Claim
138 words
IN A PROCESS FOR PRODUCING A CABLE COVERED WITH A CROSSLINKED MATERIAL, COMPRISING EXTRUDING A CROSS-LINKABLE MATERIAL ONTO A CONDUCTOR WHICH IS CONTINUOUSLY PASSED THROUGH A LONG-LAND PORTION OF AN EXTRUDING DIE UNIT AND SUBSEQUENTLY THROUGH A COOLING DEVICE DIRECTLY CONNECTED TO THE EXIT OF SAID EXTRUDING DIE UNIT, FORMING AND VULCANIZING SAID CROSS-LINKABLE MATERIAL THROUGH SAID LONG-LAND PORTION, AND COOLING SAID VULCANIZED MATERIAL ON SAID CONDUCTOR BY PRESSURIZED COOLING FLUID UNDER A PRESSURE P OF 1-30 KG/CM2 IN SAID COOLING DEVICE, WHICH PRESSURE EXERTS AN IRREGULAR PULLING FORCE ALONG THE LENGTH OF SAID CABLE THE IMPROVEMENT COMPRISING APPLYING A BRAKING FORCE T(KG) TO A PORTION OF SAID CONDUCTOR AND IN THE DIRECTION OPPOSITE TO THE MOVING DIRECTION OF SAID CONDUCTOR PRIOR TO SAID CONDUCTOR ENTERING THE EXTRUDER-CROSSHEAD; SAID BRAKING FORCE T BEING DETERMINED FROM THE FOLLOWING RELATIONSHIP:
Claim 3
Dependent Claim
113 words
A process for producing cables as set forth in claim 1 wherein said braking force T (kg) is determined from the relationship: pi (Do2-d2)/4 . P + Tmin < T < pi (Do2-d2)/4 . P + Tmax wherein: Do (cm) is the inner diameter of the delivery end of the land portion; D (cm) is the maximum delivered outer diameter of the material covering the conductor; d (cm) is the outer diameter of the conductor; P (kg/cm2) is the pressure of said cooling fluid; Tmin (kg) is the braking force in the case where D Do; and Tmax (ng) is the braking force in the case where D 1, 2D0 - - 0.2d.
Claim 4
Dependent Claim
56 words
A process for producing cables as set forth in claim 1 wherein the length of the land is from 5 to 50 (m) and the Tmin (kg) is the braking force in the case where D 0.97 Do + 0.03d and Tmax (kg) is the braking force in the case where D 1.15 Do - 0.15d.
Claim 5
Dependent Claim
20 words
A process for producing cables as set forth in claim 1 wherein the P is from 3 to 20 (kg/cm2).
Claim 6
Dependent Claim
42 words
The process of claim 1 wherein the braking force T is first determined to have a value in the range Tmin < T < Tmax when there is no pressurized cooling and subsequently determined with pressurized cooling by increasing the pressure P.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |