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1. 发明专利

JPH06182872A PREVENTING METHOD FOR PARTIAL CORROSION OF STEEL TUBE 失效
公开(公告)号：JPH06182872A
公开(公告)日：1994-07-05
申请号：JP34248192
申请日：1992-12-22
申请人： NIPPON STEEL CORP , TOKYO GAS CO LTD
发明人： MIYAMOTO YUKINOBU , YAMAGUCHI KENICHI , CHIKADA KYOJI , SASAKI NOBUHIRO , SUZUKI SHOJI
IPC分类号： B29C63/06 , F16L58/02
摘要： PURPOSE:To provide a method for heating a hat shrinkable coating material to form an excellent corrosion preventing coating having no burning deterioration and no unadhering part to an outer surface of the tube at a joint or a damaged part of the coating of a steel tube. CONSTITUTION:A heat shrinkable coating material 4 is wound on an outer surface 1 of a tube and a factory coating part 3, and its periphery is coated with a heat generator 5 made of a heat shrinkable sheet in which an electric heating wire 6 is sealed. The wire of the generator is energized to the coating material thereby to adhere the coating material to the outer surface of the tube.

2. 发明专利

JPH1142692A MANUFACTURE OF HEAT INSULATION TUBE 失效
公开(公告)号：JPH1142692A
公开(公告)日：1999-02-16
申请号：JP20268097
申请日：1997-07-29
申请人： NITTETSU BOSHOKU KK , NIPPON STEEL CORP
发明人： ISHIDA MASAMI , CHIKADA KYOJI , YOSHIDA KOTARO , KUMASHIRO TOSHIO , ENDO MASAHIRO , ANZAI TAKASHI , KUBO ICHIRO
IPC分类号： F16L59/14 , B29C47/02 , B29C48/90 , B29C63/18 , B29L9/00 , B29L23/00 , B32B5/18 , B29C47/90
摘要： PROBLEM TO BE SOLVED: To upgrade adhesive properties between a plastic film and a heat insulation layer and external appearance property by covering an outer periphery of a cylinder having a heat insulation layer of foam plastic on its outer surface with a cylindrical plastic film extruded in a melted state from a crosshead die, and then press bonding while cooling from the outer periphery. SOLUTION: A plastic film 4 is formed on an outer periphery of a cylinder 3 having a heat insulation layer 2 of foam plastic on its outer surface of a tube 1. In the case of forming the film 4, the cylinder 3 is covered with cylindrical film 4 extruded in a melted state from a crosshead die 5. And, the covered cylinder is passed with a former 6. The former 6 is formed at its inner shape in a cylindrical shape of substantially the same diameter as an outer diameter of the cylinder 3. And, cooling water supply holes 7 are uniformed provided on its inner surface in a circumferential direction. It is cooled from an outer periphery of the film 4, simultaneously pressurized by cooling water and brought into close contact with a surface of the cylinder 3. Thus, ununiformity of wrinkle, thickness of the film 4 is prevented, and adhesive properties with the layer 2 is upgraded.

3. 发明专利

JPH10114912A SOCKET MOUTH COVERING STRUCTURE OF COLORED SHIELDED CABLE AND EXECUTING METHOD THEREFOR 失效
公开(公告)号：JPH10114912A
公开(公告)日：1998-05-06
申请号：JP28726696
申请日：1996-10-11
申请人： NIPPON STEEL CORP
发明人： CHIKADA KYOJI , SEISHIYOU MORIO , KONO KENSUKE
IPC分类号： E01D11/00 , B29C63/42 , B29L9/00 , B29L23/00 , D07B9/00 , E01D11/02 , E01D11/04 , E01D19/16 , E01D101/40
摘要： PROBLEM TO BE SOLVED: To ensure a good appearance of a cable and to improve weather resistance by a method wherein a colored fluororesin heat shrinkable tube in the same color as that of colored fluororesin of a colored cable general part or in an arbitrary selected color is used for a socket mouth part. SOLUTION: A general part cable 1 is formed such that a number of galvanized metallic wires 1a are bundled and corrosion prevention covering of colored fluororesin 1c is applied on a polyethylene resin covering 1b applied on the outer periphery thereof. At the terminal part of a colored covering cable, the galvanized metallic wire 1a is exposed in a position wherein the end part of a corrosion prevention covering material is inserted in a socket 2, and fixed to the socket 2 by casting of a zinc copper alloy 2a and filling of epoxy resin 2b. Caulking material 3 is applied on the front end of a mouth part 2d of the socket 2 so that a difference in a level with the surface of a colored covering cable corrosion prevention covering material is smoothed. The outer periphery thereof is covered with a polyethylene heat shrinkage material 4 throughout a range between the socket mouth and a cable covering material, and further the outer periphery thereof is covered with a mouth covering material formed of a colored fluororesin tubular heat shrinkage material 5.

4. 发明专利

JPH09327826A METHOD AND DEVICE FOR COVERING STEEL MATERIAL TO BE COVERED WITH COVERING MATERIAL 失效
公开(公告)号：JPH09327826A
公开(公告)日：1997-12-22
申请号：JP14894796
申请日：1996-06-11
申请人： NIPPON STEEL CORP , NITTETSU BOSHOKU KK
发明人： ISHIDA MASAMI , CHIKADA KYOJI , YOSHIDA KOTARO , KUSANO YOSHITAKA , ANDO TOYOO , WADA MORIHIRO
IPC分类号： B05D7/14 , B29C33/02 , B29L9/00 , B32B15/08
摘要： PROBLEM TO BE SOLVED: To prevent the oxidation of a steel pipe due to the residual air at the covering part of materials to be covered from developing by a method wherein covering material made of a particulate thermoplastic resin is supplied and filled in a gap, which is formed between the outer peripheral surface of steel pipes to be covered and the inner surfaces of employed split molds, and heated to be fusingly bonded and solidified onto the outer peripheral surface of the steel pipes to be covered. SOLUTION: By installing an annular burner so as to cover the butt-weld WP of steel pipes to be covered Pa and Pb and its peripheral part, the above-mentioned parts are heated with the annular burner for a predetermined period of time. Next, the annular burner is removed from the steel pipes Pa and Pb to be covered and then a split mold 8 is installed so as to cove the heated weld WP and its peripheral part. Next, a particulate thermoplastic resin CP is supplied from a covering material supplying hole 6 of a split mold 8 and filled in a gap A formed between the inner surface of the split mold and the outer surface of the steel pipes to be covered Pa and Pb. Then, the resin CP is bonded with the weld WP and its peripheral part by fusing the proper amount of the filled resin CP. Further, by allowing to gradually cool the split mold 8, the split mold 8 is removed so as to form the covering with the resin CP.

5. 发明专利

JPH11125391A MANUFACTURE OF HEAT INSULATING PIPE 失效
公开(公告)号：JPH11125391A
公开(公告)日：1999-05-11
申请号：JP29193297
申请日：1997-10-24
申请人： NITTETSU BOSHOKU KK , NIPPON STEEL CORP
发明人： ISHIDA MASAMI , CHIKADA KYOJI , YOSHIDA KOTARO , KUMASHIRO TOSHIO , ENDO MASAHIRO , ANDO TOYOO , KAWASE YOSHIYUKI
IPC分类号： F16L59/14
摘要： PROBLEM TO BE SOLVED: To continuously and efficiently form a heat insulating pipe with the same process by foaming a stock solution between the outer surface of an inner pipe and the inner surface of an outer pipe to form a heat insulating layer of cellular plastic. SOLUTION: An application nozzle 16 is positioned outside an inner pipe 2, and continuously moved from the end part of the inner pipe 2 on the mandrel side to the other end in the direction of an arrow B. A stock solution of cellular plastic is supplied from the application nozzle 16 at a specified flow rate to the outer peripheral surface of the inner pipe 2. The application nozzle 16 is advanced in the direction of the arrow B and the inner pipe 2 is rotated, so that the supply point of the stock solution draws a spiral locus on the outer peripheral surface of the inner pipe 2. The stock solution has fluidity, so that it is diffused to a certain width and applied to the substantially whole outer peripheral surface of the inner pipe 2. The stock solution of the applied cellular plastic is gradually foamed on the outer peripheral surface of the inner pipe 2 and increased in volume to form a heat insulation layer 17 of cellular plastic in a gap between the inner surface of the subsequently advancing outer pipe 1 and the outer surface of the inner pipe 2.

6. 发明专利

JPH09327850A METHOD AND DEVICE FOR COVERING STEEL MATERIAL TO BE COVERED WITH COVERING MATERIAL 失效
公开(公告)号：JPH09327850A
公开(公告)日：1997-12-22
申请号：JP14894996
申请日：1996-06-11
申请人： NIPPON STEEL CORP , NITTETSU BOSHOKU KK
发明人： ISHIDA MASAMI , CHIKADA KYOJI , YOSHIDA KOTARO , KUSANO YOSHITAKA , ANDO TOYOO , KAWASE YOSHIYUKI
IPC分类号： B05D7/14 , B29C33/02 , B29C47/02 , B29C63/18 , B29K101/12 , B29K705/12 , B29L9/00 , B32B15/08 , F16L25/00
摘要： PROBLEM TO BE SOLVED: To remove the apprehension of the oxidation and lowering of adhesion of a steel pipe due to residual air by a method wherein the covering material made of a thermoplastic resin under solid state is forced in a space formed between the steel material to be covered and the inner surface of a split mold under the condition that the region aiming at covering with covering material of the steel material to be covered in heated and the split mold is installed on the outer surface of the steel material to be covered. SOLUTION: After steel pipes to be covered Pa and Pb to be welded together at side joined together by butt welding, a butt-weld WP and its periphery are heated with flame for a predetermine period of time. After that, split molds 7a and 7b are installed on the butt-weld WP of the heated steel pipes to be covered Pa and Pb and its periphery. Solid thermoplastic resin CP, which is brought into molten state be being extruded under heat with an extruder, is forced from the forcing port 5 of covering material in a gap A, which is formed between the inner surface of the split molds and the outer surface of the steel pieces to be covered Pa and Pb, and molded simultaneously. By holding the fully charged thermoplastic resin under molten state for a predetermined period of time, the forced and molded thermoplastic resin is bonded to the steel pipe. After the covering material is cooled down and solidified, the split molds 7a and 7b are removed.

7. 发明专利

JPH1144394A MANUFACTURE OF HEAT INSULATING PIPE 失效
公开(公告)号：JPH1144394A
公开(公告)日：1999-02-16
申请号：JP20268197
申请日：1997-07-29
申请人： NITTETSU BOSHOKU KK , NIPPON STEEL CORP
发明人： ISHIDA MASAMI , CHIKADA KYOJI , YOSHIDA KOTARO , ANDO TOYOO , KAWASE YOSHIYUKI , KUSANO YOSHITAKA
IPC分类号： F16L59/147 , B29C63/06
摘要： PROBLEM TO BE SOLVED: To provide a method to efficiently form a plastic coating film excellent in an appearance property and watertightness on a surface of a heat insulating layer of foaming plastic in the case of manufacturing a heat insulating pipe having the heat insulating layer of foaming plastic on an outer periphery of a pipe and a plastic protective coating film on its surface. SOLUTION: A beltlike plastic film 5 pushed out in a melting condition from a slit nozzle by a T die method, is cooled on a cooling roller 6, and after its temperature is set to a prescribed temperature higher than a softening point temperature of a plastic material, it is wound in a spiral shape while applying pressing force to an outer periphery of a heat insulating layer 2 of foaming plastic. A surface temperature of the plastic film 5 before winding is set higher by 60 to 120 deg.C than a softening point temperature of the plastic material. This temperature is also controlled by adjusting a temperature of the cooling roller 6.

8. 发明专利

JPH10113991A RESIN COATING METHOD FOR CABLE UNIT AND HEAT SEAL DEVICE THEREFOR 失效
公开(公告)号：JPH10113991A
公开(公告)日：1998-05-06
申请号：JP28939096
申请日：1996-10-11
申请人： NIPPON STEEL CORP , DAI ICHI HIGH FREQUENCY CO LTD
发明人： CHIKADA KYOJI , KUROKI RYOICHI
IPC分类号： B29C63/42 , B29L9/00 , B29L23/00
摘要： PROBLEM TO BE SOLVED: To provide a method for easily applying a resin coat on a short section with respect to the longitudinal direction of a cable unit having a large diameter socket at both ends of the cable main body. SOLUTION: A resin sheet 11 having a thermally contracting property considerably longer than the outer periphery length of a cable main body is rolled so as to surround the cable main body 1. By superimposing both ends thereof, a superimposed part 12 is formed. By detaching the superimposed part 12 from the surface of the cable main body 1, placing a first force piston 15 inside thereof, placing a second force piston 16 outside thereof, and pressing and heating the superimposed part 12 by both force pistons, a cylindrical member 11A can be formed out of the resin sheet. The cylindrical member 11A is moved to a position for the resin coat. By the thermal contraction at the position, a cable unit is coated. Accordingly, an optional position with respect to the longitudinal direction of the cable unit can be resin coated preferably.

9. 发明专利

JPH09327834A METHOD AND DEVICE FOR COVERING STEEL MATERIAL TO BE COVERED WITH COVERING AGENT 失效
公开(公告)号：JPH09327834A
公开(公告)日：1997-12-22
申请号：JP14894896
申请日：1996-06-11
申请人： NIPPON STEEL CORP , NITTETSU BOSHOKU KK
发明人： ISHIDA MASAMI , CHIKADA KYOJI , YOSHIDA KOTARO , KUSANO YOSHITAKA , ANDO TOYOO , ENDO MASAHIRO
IPC分类号： B29C33/10 , B29C39/10 , B29C39/42 , B29K101/10 , B29L9/00
摘要： PROBLEM TO BE SOLVED: To prevent the oxidation of a steel pipe die to the residual air at the covering part of materials to be covered from developing by a method wherein a thermosetting covering agent is charged in an enclosed gap made between the outer peripheral surface of steel pipes to be covered and the inner surfaces of split molds, which are installed on the region aiming at covering with the covering material of the steel pipes to be covered and then cured. SOLUTION: A split mold 13 having a vent hole 12 is installed so as to cover the butt-weld of steel pipes to be covered Pa and Pb and its peripheral part. Next, a thermosetting covering agent PU is prepared by mixing a urethane resin solution and a hardener with a mixing device so as to be supplied through the covering agent supplying hole of the splid mold 13 into an enclosed gap A, which is formed between the inner surface of the split mold and the outer surface of the steel pipes to be covered Pa and Pb. Next, after the covering agent PU is confirmed to be fully filled in the enclosed gap A by means of a vent hole 12, the covering agent PU is cured and hardened for a predetermined period of time, the covering agent PU covers the weld WP and its peripheral part. Then, after the elapse of the predetermined curing time, the split mold 13 is removed.

10. 发明专利

JPH07293749A JOINT STRUCTURE FOR DIRECT PUSH PROPULSION PIPE 失效
公开(公告)号：JPH07293749A
公开(公告)日：1995-11-10
申请号：JP10437394
申请日：1994-04-20
申请人： NIPPON STEEL CORP
发明人： CHIKADA KYOJI
IPC分类号： F16L13/02 , F16L1/024 , F16L21/02 , F16L58/10
摘要： PURPOSE:To perform work in a short time by a simple means and moreover restrain the occurrence of the stripping of a coating material in propulsion work by covering a fiber reinforced synthetic resin pipe, divided plurality and formed into specific thickness and length respectively, on the outer periphery of heat contracting coating material covered on a corrosionproof coating layer to be stuck. CONSTITUTION:In right and left butt welded propulsion pipes and pipe end parts, the exposure parts 2a of a corrosionproof coating layer 2 shop-coated are overlapped to be covered by heat contracting coating material to be contracted and collosionproofly coated. Then the inner surface and end part of a halved fiber reinforced synthetic resin pipe 6 are stuck by adhesive 7. At that time, the total thickness of a joint part is made thinner than the that of the shop-coated corrosionproof coating layer 2 and a protective layer 3, and the fiber reinforced synthetic resin pipe 6, plurally devided and formed into L1 shorter than the end part interval L of the protective layer 3, is used to perform sticking.

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