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1. 发明专利

JPH05166420A RUBBER-PLASTIC POWER CABLE 失效
公开(公告)号：JPH05166420A
公开(公告)日：1993-07-02
申请号：JP35215491
申请日：1991-12-13
申请人： FUJIKURA LTD
发明人： OSHIMA HIROHITO , TAKESHITA MASACHIKA , MOTAI TSUNEAKI , SAKAGUCHI HISAO , ISHIKAWA TORAICHI
IPC分类号： H01B7/282 , H01B7/28 , H01B9/02
摘要： PURPOSE:To prevent the lowering of an impulse breakdown voltage and an alternating current long-running breakdown voltage by preventing a moisture from moving into an internal semiconductive layer from an insulating paper for dividing use and the like at the time of extrusion continuous-bridging with a moisture isolating layer being provided inside the internal semiconductive layer. CONSTITUTION:A moisture isolating layer 40 is provided on a semiconductive tape winding layer 18 inside an internal semiconductive layer 20. A moisture isolating tape used to form the layer 40, for instance, is longitudinally wrapped on a tape 18 wound on a cable conductor 10, and then the layer 20, a cable insulator 22 and an external semiconductive layer 24 are simultaneously extruded thereon at the cross-head of an extruding machine and after that, bridged and cooled at a bridging cylinder and then the wrapped part of the moisture isolating tape is bonded by conductor preheat and heat generated at the time of bridging. Thereby, a moisture is not moved into the layer 20 from the insulating paper 12 for dividing use, an intervening paper 14, 16 and the tape 18 at the time of extrusion continuous-bridging. Accordingly, the lowering of an impulse breakdown voltage and an alternating current long-running breakdown voltage may be prevented.

2. 发明专利

JPH0418229B2 失效
公开(公告)号：JPH0418229B2
公开(公告)日：1992-03-27
申请号：JP27363986
申请日：1986-11-17
申请人： FUJIKURA LTD
发明人： SUGIHARA SHINICHI , MOTAI TSUNEAKI , MOCHIZUKI MASATAKA
IPC分类号： F28D15/02

3. 发明专利

JPH0324034B2 失效
公开(公告)号：JPH0324034B2
公开(公告)日：1991-04-02
申请号：JP16628383
申请日：1983-09-09
申请人： FUJIKURA LTD
发明人： MASUKO KOICHI , TAKAOKA MICHIO , MOTAI TSUNEAKI , MOCHIZUKI MASATAKA , ITO MASAHIKO
IPC分类号： F28D15/02 , F28D15/06 , H01R13/53

4. 发明专利

JPH01314142A MANUFACTURE OF HEAT-SHRINKABLE TUBE 失效
公开(公告)号：JPH01314142A
公开(公告)日：1989-12-19
申请号：JP14613688
申请日：1988-06-14
申请人： FUJIKURA LTD
发明人： ONISHI AKISHI , MOTAI TSUNEAKI , YOSHIDA SHOTARO , HASEGAWA SHOICHI
IPC分类号： B29C47/94 , B29C48/90 , B29C61/08 , B29K105/02 , B29L23/00
摘要： PURPOSE:To reduce the viscosity coefficient of a friction relaxing solution by continuously injecting an appropriate solvent in the flow of the friction relaxing solution at the beginning of a hollow columnar resin cooling process. CONSTITUTION:An appropriate solvent is injected in the flow of a friction relaxing solution at the beginning of a cooling zone. For the sake of this, for example, the injection pipe 17 communicating with the flow of the friction relaxing solution is provided at the position directly above the mount part of the jacket of a cooling apparatus 11 and an injection pressure feed pump P is interposed between the injection pipe 17 and a separately provided solvent tank 18. As the solvent, water can be used when the friction relaxing solution is, for example, ethylene glycol.

5. 发明专利

JPH01128821A METHOD FOR CONTROLLING WALL THICKNESS OF PLASTIC TUBE 失效
公开(公告)号：JPH01128821A
公开(公告)日：1989-05-22
申请号：JP28899087
申请日：1987-11-16
申请人： FUJIKURA LTD
发明人： ONISHI AKISHI , MOTAI TSUNEAKI , YOSHIDA SHOTARO , HASEGAWA SHOICHI
IPC分类号： B29C48/325 , B29C48/92
摘要： PURPOSE:To make it possible to cope with even complicated abnormal wall thickness by a method wherein controlling members are actuated in response to the outputs of thickness sensors so as to control the gas between a thin cylinder and a mandrel. CONSTITUTION:A part of a main body, which surrounds a mandrel 16, is made of a deformable elastic metal thin cylinder 40. Controlling members 42, each of which is shiftable in the radial direction of the thin cylinder 40, are arranged at a plurality of sites outside the thin cylinder 40. Sensors, each of which measures the wall thickness of an extruded tube, are respectively mounted at positions corresponding to the controlling members 42 so as to actuate the controlling members 42 in response to the outputs of the thickness sensors 50 so as to control the gap between the thin cylinder 40 and the mandrel 16. For example, if the wall thickness measured with the thickness sensor 50a is thicker than the normal wall thickness, a motor 46a is rotated by the action of a control device 48 so as to slightly advance the controlling member 42a. As a result, the gap between the thin cylinder 40 and the mandrel 16 at the site, at which the controlling member 42a is mounted, becomes narrower, resulting in bringing the wall thickness back to a normal size.

6. 发明专利

JPS6457508A DC CABLE 失效
公开(公告)号：JPS6457508A
公开(公告)日：1989-03-03
申请号：JP21129487
申请日：1987-08-27
申请人： FUJIKURA LTD
发明人： YOKOYAMA SHIGEKAZU , TAKAOKA MICHIO , MOTAI TSUNEAKI , YOSHIDA SHOTARO , HASEGAWA SHOICHI , TAN MASAYUKI , YAMANOUCHI HIROSHI
IPC分类号： H01B3/44
摘要： PURPOSE:To improve the thermal characteristic of polyethylene and enhanced its dielectric strength by fluoridizing the polyethylene with a specified molality. CONSTITUTION:Powder or a pellet of polyethylene is fluoridized by heating in a fluorine gas ambient. Then, formed on a conductor is an insulating layer containing the 0.005-1mol fluoridized polyethylene. Thereby, a vast equipment is not required in a bridging line after an extruding process although it is required in the prior art, since a chemical bridging is not required. Further, a DC cable with a good impulse breakdown characteristic and a good DC breakdown characteristic can be obtained in the same thickness of insulating layer with that of the prior art.

7. 发明专利

JPS6424307A DC POWER CABLE 失效
公开(公告)号：JPS6424307A
公开(公告)日：1989-01-26
申请号：JP18141187
申请日：1987-07-21
申请人： FUJIKURA LTD
发明人： YAMANOUCHI HIROSHI , OKIAYU RYUICHI , YOSHIDA SHOTARO , MOTAI TSUNEAKI
IPC分类号： H01B3/44 , H01B9/02
摘要： PURPOSE:To increase the DC breakdown voltage by providing space charge mitigating layers at least between an inside semiconductive layer and an insulator or between an outside semiconductive layer and the insulator. CONSTITUTION:Space charge mitigating layers 4-7 preventing the accumulation of space charges are provided at least between an inside semiconductive layer 1 located around a conductor N and an insulator 2 or between an outside semiconductive layer 3 and the insulator 2. The space charge mitigating layer 4 is provided between the inside semiconductive layer 1 and the insulator 2, and the space charge mitigating layer 5 is provided between the outside semiconductive layer 3 and the insulator 2, and space charge mitigating layers 6, 7 are provided both between the inside semiconductive layer 1 and the insulator 2 and between the outside semiconductive layer 3 and the insulator 2. The accumulation of space charges giving an adverse effect to the insulator 2 is thereby reduced, and a DC power cable with the high dielectric strength is obtained.

8. 发明专利

JPS644335A CONNECTING METHOD OF CROSSLINKED POLYOLEFIN POWER CABLE 失效
公开(公告)号：JPS644335A
公开(公告)日：1989-01-09
申请号：JP15929487
申请日：1987-06-26
申请人： FUJIKURA LTD
发明人： KAJI ISAO , TAKAOKA MICHIO , MOTAI TSUNEAKI , ONO MIKIYUKI , HASEGAWA SHOICHI , KURATA MASARU
IPC分类号： B29C65/70 , B29C39/10 , B29K105/24 , B29L31/34 , H01R43/00 , H02G1/14
摘要： PURPOSE:To crush an air gap by detecting existence of the air gap in a mold, by a method wherein after bleeding of resin through the mold, a small quantity of the resin is cast additionally at higher pressure than casting pressure up to that time without deciding immediately that casting is completed. CONSTITUTION:The inside of a mold 14 is filled with resin 20 containing a crosslinking agent by casting through the center by an extruding resin 20 and bleeding is begun through a bleeding hole 16, a small quantity of the resin is cast into the mold additionally at higher pressure than casting pressure up to that time by closing the bleeding hole without deciding immediately that casting is completed. Then resin pressure within the mold 14 is raised suddenly, when there is no air gap within the mold 14, the resin pressure hardly varies and when there is the air gap within the mold 14, pressure is lowered. Therefore, the existence of the air gap is detected through a pattern of the pressure; in the case where it is revealed that there is the air gap, one or more number of times of readdition of the resin are performed.

9. 发明专利

JPS63319125A CONTINUOUS PRODUCTION EQUIPMENT OF CROSSLINKING TYPE HEAT-SHRINKABLE TUBING 失效
公开(公告)号：JPS63319125A
公开(公告)日：1988-12-27
申请号：JP15615687
申请日：1987-06-23
申请人： FUJIKURA LTD
发明人： ONISHI AKISHI , MOTAI TSUNEAKI , YOSHIDA SHOTARO , HASEGAWA SHOICHI
IPC分类号： B29C69/00 , B29C61/08 , B29K105/24 , B29L23/00
摘要： PURPOSE:To surely and stably manufacture a heat-shrinkable tubing having enough heat shrinkability by a method wherein a resin tubing is held in the temperature range, which is lower than the crosslinking temperature of the resin tubing and higher than its softening temperature, in the neighborhood of the inlet of a divergent die in order to prevent crosslinking from proceeding during or after the expansion of the diameter of the resin tubing. CONSTITUTION:An un-crosslinked resin tubing 5 descends in a crosslinking tube 7 and is thermally crosslinked during descent and brought into contact by pressure with the inner surface of the crosslinking tube 7 by the pressurizing force of pressure fluid fed through a fluid feeding line 6. The crosslinked resin tubing 5 is controlled to be held at the temperature, which is lower than the crosslinking temperature and at the same time higher than the softening temperature of the resin tubing by the temperature controlling means 24 of a divergent die 10 and expanded along the inner surface 10A of the divergent die 10 so as to be diametrically expanded. The diametrically expanded resin tubing 5 is cooled in a cooling expanded. The diametrically expanded resin tubing 5 is cooled in a cooling tube 11 down to room temperature so as to be turned into a heat-shrinkable tubing and passed through a mouth piece 12 and finally deformed into a flat shape and further taken up with a take-up 13.

10. 发明专利

JPS63284446A DEFECT DETECTING METHOD FOR PLASTIC OPTICAL FIBER BEING EXTRUDED 失效
公开(公告)号：JPS63284446A
公开(公告)日：1988-11-21
申请号：JP11876087
申请日：1987-05-18
申请人： FUJIKURA LTD
发明人： HASEGAWA SHOICHI , MOTAI TSUNEAKI , YOSHIDA SHOTARO , TAN MASAYUKI , NATORI NOZOMI
IPC分类号： G01M11/00 , G02B6/00
摘要： PURPOSE:To detect the defect of an optical fiber by inserting an optical transmitting element into a flow of resin for a core in the core extruding cylinder of an extruder, arranging a light receiving element between the head of the extruder and a take-up unit, and making coherent light incident on the rear end of the optical transmitting element during resin extrusion and detecting leak light by the light receiving element. CONSTITUTION:An Si fiber rod as the optical transmitting element 11 is inserted into the center part of the resin 9 for the core of the optical fiber, resin 10 for the clad of the optical fiber, and resin for the core. The core resin 9 becomes the optical fiber core 12 by passing through a nipple 4 and the resin 10 is formed with a die 5 to become the clad 13 covering the outside of the core 12. The light which is incident on the optical transmitting element 11 is transmitted into the core 12 from the tip and scattered if the core 12 has void or contains foreign matter to leak out of the clad 13. When this defect part passes the light receiving element part, the light receiving element 15 detects leak light from the part to find the defect part.

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