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61.发明专利
公开(公告)号：JP2001341187A
公开(公告)日：2001-12-11
申请号：JP2000167817
申请日：2000-06-05
Applicant: TORAY INDUSTRIES
Inventor： ENDO YOSHIKAZU , TOYODA KATSUYA , KOTOURA MASAAKI
IPC: B29C47/88
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a thermoplastic resin sheet using a static electricity applying casting method, drastically increasing the upper limit of a sheet molding speed caused by the applying irregularity defect generated in the thermoplastic resin sheet, and a static electricity applying casting method used therein. SOLUTION: In the method for manufacturing the thermoplastic resin sheet using the static electricity applying casting method when a thermoplastic resin is melted and extruded from a cap in a sheetlike state and the extrudate is cooled and solidified by a cooling drum, electrostatic charge is applied to the thermoplastic resin extruded into a sheetlike shape in a molten state so that the generation quantity of electrostatic charge in the vicinity of the end edge part of the sheet is made less than that of the central part of the sheet and a position where the generation quantity of electrostatic charge becomes little is made adjustable in the width direction of the sheet.
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公开(公告)号：JPH1120004A
公开(公告)日：1999-01-26
申请号：JP18744997
申请日：1997-06-27
Applicant: TORAY INDUSTRIES
Inventor： OKASHIRO HIDETOSHI , TOYODA KATSUYA , OKUBO KENICHI
IPC: B29C47/88 , B29K101/12 , B29L7/00
Abstract: PROBLEM TO BE SOLVED: To efficiently obtain a sheet at high speed without impairing quality by a method wherein the position of a blade-like electrostatic applying electrode to a cooling rotator is adjusted biaxially and, at the same time, the angle between the normal direction of the cooling rotator and the blade-like electrostatic applying electrode is adjusted. SOLUTION: A blade-like electrostatic applying electrode 4 is provided in the neighborhood of the landing point 8 of a thermoplastic resin sheet to a cooling rotator 2 so as to bring the thermoplastic resin sheet 3 into close contact with the cooling rotator 2. Both the end parts of the blade-like electrostatic applying electrode 4 are covered with insulating members 5, the end part of each of which is supported with a holding part 6. The holding part 6 is made slidable on a fixed stand 13 and horizontally adjusted with a bolt 10 under the condition that a stay 11 cats as a fulcrum and vertically adjusted with the hold 12. Further, with the rotating devices 14 at both the end parts of the electrostatic applying electrode 4, the angle between the normal direction of the cooling rotator 2 and the blade-like electrostatic applying electrode 4 is preperly adjusted. As a result, the applying electrode can be easily and accurately adjusted to an optimum position.
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公开(公告)号：JPH10323881A
公开(公告)日：1998-12-08
申请号：JP15449097
申请日：1997-05-27
Applicant: TORAY INDUSTRIES
Inventor： TOYODA KATSUYA , OKUBO KENICHI , OKASHIRO HIDETOSHI
Abstract: PROBLEM TO BE SOLVED: To form a thermoplastic resin sheet of superior thickness uniformity, and scarcely having surface defects at high speed. SOLUTION: In a method for forming a sheet by extruding molten thermoplastic resin in the sheet shape from a mouthpiece and bonding and solidifying the resin on a cooling drum by the electrostatic applying method, a conductive tape having a rectangular section and the uniform shape in the longitudinal direction and the relation of thickness (X) and width (Y) satisfies the formula of 50
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公开(公告)号：JPH10272678A
公开(公告)日：1998-10-13
申请号：JP9661697
申请日：1997-03-31
Applicant: TORAY INDUSTRIES
Inventor： OKUBO KENICHI , TOYODA KATSUYA , OKASHIRO HIDETOSHI
IPC: C08J5/18 , B29C47/88 , B29C55/12 , B29K67/00 , B29L7/00 , B32B1/02 , B32B15/08 , B32B15/09 , B32B27/36 , C08L67/02 , H01G4/18
Abstract: PROBLEM TO BE SOLVED: To satisfy an electrical insulating properties as an electrical material, suppress the elution of metal as the inner lining material of a packaging material and of a filling vessel for drinking water, and suppress the occurrence of defect such as pining holes by a method wherein the unevenness of a longitudinal thickness is set to be a specified value, the surface haze of a film is set to be a specified value, and its melt specific resistance is set to be within a specified range. SOLUTION: The unevenness of a longitudinal thickness must be below 20%. If its unevenness exceeds 20%, the unevenness of an insulating properties and poor slitting at working are caused when employed as an electrical material and poor slitting at working is caused as a packaging material and the inner lining material of a filling vessel and poor bonding and separation are caused at the lamination to a metal can as the inner lining material of the filling vessel. The surface haze of a film should be lower than 1.5%. If it is 1.5% or above, the lowering of the adhesion between the metal can as the filling vessel and the film develops and, in addition, the lowering of its shook resistance and its insulating properties develops also. The melt specific resistance of the film must be within the range of 5×10 -2×10 ω.cm. If its melt specific resistance is outside of the above-mentioned range, elution of metal and poor bonding to a cooling rotary body occur.
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公开(公告)号：JPH08230032A
公开(公告)日：1996-09-10
申请号：JP6213695
申请日：1995-02-24
Applicant: TORAY INDUSTRIES
Inventor： TOYODA KATSUYA , YAMAMOTO AKIKO , TSUNASHIMA KENJI
Abstract: PURPOSE: To efficiently obtain a biaxially stretched film high in mechanical strength by setting the main axis of molecular orientation to the longitudinal direction of a film and setting the specific resistance of the film at a time of melting to a specific value. CONSTITUTION: In a case film, the main axis of molecular orientation is set to the longitudinal direction of the film and the specific resistance of the film at a time of melting is set to below 5×10 Ω.cm. As polyester, polyethylene terephthalate or polyethylene-2,6-naphthalate is especially pref. from a viewpoint of mechanical strength, heat resistance, chemical resistance, durability or general-purpose properties. The melt specific resistance of polyester is determined based on the kind, present state and quantity of the metal contained in polyester and becomes lower as the quantity of a non-deactivated molten metal is larger and the amt. of precipitated internal particles is smaller. Polyester is pref. cast while draft is applied to a film within a temp. range wherein the temp. of polyester at the time of the emission from a flat die is below the completion temp of the endothermic peak at the time of melting and equal to or higher than temp. falling crystallization start temp.
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Patent Agency Ranking
公开(公告)号：JPH08216248A
公开(公告)日：1996-08-27
申请号：JP5664195
申请日：1995-02-20
Applicant: TORAY INDUSTRIES
Inventor： YAMAMOTO AKIKO , TOYODA KATSUYA , MIYAGAWA KATSUTOSHI
Abstract: PURPOSE: To obtain a polyester film excellent in mechanical strength by the improvement in the casting process before a stretching process by specifying the double refraction of a cast polyester film. CONSTITUTION: The double refraction Δn of a cast polyester film is set to 0.2×10 . A biaxially oriented polyester film is obtained by longitudinally and laterally stretching the cast polyester film. The cast polyester film is a sheet like film obtained by extruding a molten polymer from a flat die and quenching the extrudate on a cooling roll to solidify the same. This polyester film is characterized by that the main axis of the molecular chain of the cast film is longitudinally oriented. The F-5 value in at least one of the longitudinal and lateral directions of the oriented film as mechanical strength is pref. 14kg/mm or more. The F-5 value is obtained by measuring the stress of a sample film having predetermined length at the time of 5% elongation according to a tensile test using a tensile tester.
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公开(公告)号：JPH08197618A
公开(公告)日：1996-08-06
申请号：JP3162395
申请日：1995-01-26
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , TSUNASHIMA KENJI , TOYODA KATSUYA
Abstract: PURPOSE: To stably provide a polyester film whose mechanical strength particularly in the lateral direction is remarkably improved which has not been achieved in a prior art. CONSTITUTION: A polyester film which is substantially in an amorphous state is stretched in the lateral direction in such a manner that a double refraction (Δn) of the film becomes 0.002-0.020 and a crystallizability becomes 10% or lower. It is further stretched in the lateral direction at a temperature lower than the temperature in the precedent lateral stretch.
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公开(公告)号：JPH08197612A
公开(公告)日：1996-08-06
申请号：JP3454695
申请日：1995-01-30
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TOYODA KATSUYA , MIYAGAWA KATSUTOSHI
IPC: B29C47/80 , B29C47/88 , B29C48/305 , B29L7/00 , B29C47/14
Abstract: PURPOSE: To manufacture a thermoplastic resin film having small surface roughness by a method wherein a thermoplastic resin is melted with heat and sent to a flat die, expanded in the cross direction, cooled to a specified temperature, and an extruded melting sheet is stuck to a cooling drum having water liquid film so as to cool and solidify. CONSTITUTION: A thermoplastic resin such as a polyolefin resin and a polyamide resin is melted by heating to a melting completion temperature or higher and sent to a flat die. The resin is expanded in the cross direction at a manifold in the die. Thereafter, the thermoplastic resin is cooled to the melting completion temperature or lower and a down temperature crystallization start temperature or higher at a land of the die and extruded so as to form a melting sheet. The melting sheet is stuck to a cooling drum having water liquid film, cooled, and solidified so as to obtain a desired film. At this time, electrostatic charge is preferably applied to the melting sheet, and the thickness of the water liquid film is set to 0.01-1μm. A surface roughness Ra of a thermoplastic resin film obtained in this way is made to be 1μm or below.
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公开(公告)号：JPH08176317A
公开(公告)日：1996-07-09
申请号：JP32296694
申请日：1994-12-26
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TOYODA KATSUYA , SUZUKI MASARU
Abstract: PURPOSE: To obtain a polyester film having fish eyes in a specific number, having a high mol.wt. and a high intrinsic viscosity, little in foreign matters, excellent in stiffness, toughness and heat resistance, and useful as an electric insulating material, etc. CONSTITUTION: This film has an intrinsic viscosity of >=0.8 and has >=30μm fish eyes (referred to as FE) in the number of , preferably . The film is a monoaxially or diaxially oriented film, and the polyester comprises preferably (A) a non-liquid crystalline polyester (e.g. polyethylene terephthalate), and (B) 0.1-40wt.% of a liquid crystalline polyarylate [e.g. having structural units of the formula (X, Y are H, halogen,
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公开(公告)号：JPH07323464A
公开(公告)日：1995-12-12
申请号：JP109495
申请日：1995-01-09
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , YASHIRO TOSHIYA , TOYODA KATSUYA , TSUNASHIMA KENJI
IPC: B29C47/86 , B29C48/305 , B29K101/12 , B29L7/00 , B29C47/14
Abstract: PURPOSE:To restrain the unevenness of a film in its thickness by heat-melting thermoplastic resin at a melt-completion temperature or higher to be forwarded Into a die, and cooling it at the low temperature crystallization Initiating temperature or higher in the land part of the die to be extruded thereafter. CONSTITUTION:In the case where a sheet cast film is obtained by melt-extruding thermoplastic resin In use of a flat die, thermoplastic resin is heat-melted at a fusion completion temperature Tme or higher to be melted and then forwarded into the die. After it is subsequently expanded in its width direction in the die, so that thermoplastic resin is subjected to a process to be extruded after being cooled at Tmc or lower and high temperature crystallization initiating temperature Tcb or higher. The cast film is preferred to be substantially an unstretched film with a birefringence rate lower than 0.01, and the relation of the temperature Tout of thermoplastic resin at the outlet of the die land part is preferably set to be Tin>Tout+20 deg.C. By making resin Into a low temperature and high rigidity in this manner, the film vibration and unevenness of the thickness can be restrained.
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