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公开(公告)号：JPH09185819A
公开(公告)日：1997-07-15
申请号：JP35667096
申请日：1996-12-27
Applicant: TORAY INDUSTRIES
Inventor： ABE KOICHI , TOYODA KATSUYA , NAGATA RYUICHI
Abstract: PROBLEM TO BE SOLVED: To provide a base film for a magnetic recording medium which is improved in dubbing resistance and is suppressed in the deposition of a low mol.wt. material on the film surface by forming projections of a high density and uniform height on the film surface. SOLUTION: This base film consists of a biaxially oriented polyester film formed by laminating a film consisting essentially of polyester A and particles on at least one surface of a film consisting essentially of polyester B. In such a case, the thickness of the laminated film of the polyester A is 0.005 to 3μm, the average grain size of the particles incorporated into the laminated film is 0.1 to 10 times the thickness of the laminated film and the content of the particles in the laminated film is below 2wt.%. In addition, the content of the low mol. wt. material in the entire part of the biaxially oriented polyester film is
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公开(公告)号：JPH09141736A
公开(公告)日：1997-06-03
申请号：JP32658795
申请日：1995-11-21
Applicant: TORAY INDUSTRIES
Inventor： ANZAI TOUCHI , TOYODA KATSUYA , OKUYAMA YUTAKA
Abstract: PROBLEM TO BE SOLVED: To provide a biaxially stretched polyester film improved in productivity by reducing the rupture of a film at the time of lateral stretching and the loss of edge parts not becoming a product and further in quality such as thickness uniformity or irregularity of physical properties in the lateral direction of the film and to provide a method for producing this film at a high speed. SOLUTION: The producing method is constituted so that molten polyester is injected to a rotary cooling body from a cap and quenched to mold a non- stretched sheet which is, in turn, successively stretched longitudinally and laterally to be thermally fixed. In this case, the film after stretched in the longitudinal direction is laterally stretched by grasping the lateral end parts where the refractive index in the lateral direction of the film is more than that of -0.04 or more of the flat central part in the lateral direction of the film, that is, 1.54-1.6. The biaxially stretched film thus obtained is reduced in thickness fluctuations in the longitudinal direction and has specific characteristics by FFT analysis.
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公开(公告)号：JPH08281794A
公开(公告)日：1996-10-29
申请号：JP5094996
申请日：1996-02-14
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TOYODA KATSUYA , TSUNASHIMA KENJI
Abstract: PURPOSE: To obtain a thermoplastic resin film not having thickness irregularity having a peculiar cycle and extremely high in thickness uniformity by separating the thickness irregularity of the film by the generation cause thereof to eliminate the same. CONSTITUTION: A thermoplastic resin film excellent in thickness uniformity is characterized by that the thickness irregularity in the longitudinal direction of the film is 5% or less and the ratio Pw1/PwT of the spectrum intensity sum Pw1 in a wavenumber of 0.015-0.45 (1/m) when the waveform of the thickness irregularity is subjected to Fourier analysis to the spectrum intensity sum Pw T in a total wavenumber and is 0.2 or less.
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公开(公告)号：JPH08276493A
公开(公告)日：1996-10-22
申请号：JP1802096
申请日：1996-01-09
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MINAMIZAWA HIDEHITO , TOYODA KATSUYA
IPC: B41M5/382 , B29C55/14 , B29K67/00 , B29L7/00 , B41M5/40 , B41M5/41 , C08J5/18 , G11B5/73 , H01G4/18 , G11B5/704
Abstract: PURPOSE: To stably supply a polyester film drastically enhanced in mechanical strength incapable of being achieved by conventional technique especially in its lateral direction. CONSTITUTION: A substantially amorphous polyester film is longitudinally stretched so that the double refraction (Δn) of the film becomes 0.002-0.02 and the degree of crystallization thereof becomes 10% or less and subsequently stretched laterally at temp. lower than longitudinal stretching temp.
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公开(公告)号：JPH08244112A
公开(公告)日：1996-09-24
申请号：JP7827695
申请日：1995-03-08
Applicant: TORAY INDUSTRIES
Inventor： TOYODA KATSUYA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PURPOSE: To obtain a biaxially oriented polyester film fully satisfying both of mechanical characteristics and thermal dimensional stability and excellent in thickness uniformity. CONSTITUTION: A biaxially oriented polyester film is produced by longitudinally stretching a cast film characterized by that a value (nM-nTD) calculated by subtracting the refractive index (nTD) in the lateral direction of the film from the refractive index (nMD) in the longitudinal direction thereof is 0.1×10 -10×10 at least over two or more stages before laterally stretching the same.
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Patent Agency Ranking
公开(公告)号：JPH08197607A
公开(公告)日：1996-08-06
申请号：JP3162695
申请日：1995-01-26
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TOYODA KATSUYA , MIYAGAWA KATSUTOSHI
IPC: B29C47/86 , B29C48/305 , B29L7/00 , B29C47/14
Abstract: PURPOSE: To prevent generation of surface defect of a film, particularly striping defect by specifying a product of a draft ratio for film extrusion and a film thickness when a sheet-like cast film is to be obtained by melting and extruding a thermoplastic resin by using a flat die. CONSTITUTION: In a method wherein a sheet-like cast film is manufactured by melting and extruding a thermoplastic resin by using a flat die, when a film thickness d is 100μm or less, a product Rd of a draft ratio R for film extrusion and the film thickness d is set to 1000 or above. When the film thickness d exceeds 100μm, the draft ratio R of the extrusion is set to 10 or aboves. In manufacturing, the thermoplastic resin is melted by heating to a melting completion temperature or higher and sent to the die. After the thermoplastic resin is expanded in the die in the cross direction, it is cooled, at a land of the die, to the melting completion temperature or lower and a down temperature crystallization start temperature or higher, and then extrusion molding is performed. Thus, a film having a little ferrule stripe is obtained.
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公开(公告)号：JPH08134231A
公开(公告)日：1996-05-28
申请号：JP27487194
申请日：1994-11-09
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MINAMIZAWA HIDEHITO , TOYODA KATSUYA
Abstract: PURPOSE: To obtain a polyethylene naphthalate film having high rigidity and satisfactory thermal stability. CONSTITUTION: The film has a value of B of 0.07-0.31, provided that B=Eβ /Eα , wherein Eα is the maximum mechanical loss tangent, tanδ, of the main dispersion at around 175 deg.C and Eβ is that of the subdispersion at around 100 deg.C.
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公开(公告)号：JPH08103950A
公开(公告)日：1996-04-23
申请号：JP23901094
申请日：1994-10-03
Applicant: TORAY INDUSTRIES
Inventor： MINAMIZAWA HIDEHITO , TSUNASHIMA KENJI , TOYODA KATSUYA
Abstract: PURPOSE: To facilitate the longitudinal cutting while obtaining the lateral strength and to improve the characteristics of a final product of digital video tape by specifying the thickness of a film, the Young's modulus of the lateral direction of the film and the tear propagating velocity of the longitudinal direction of the film. CONSTITUTION: Regarding biaxially oriented polyester film, the thickness of the film is specified to 8μm or less, the Young's modulus of the lateral direction (TD) of the film is specified to 800kg/mm or more, and the tear propagating velocity of the longitudinal direction (MD) of the film is specified to 50-300g/mm. Two or more layers of the films are laminated, inactive particles are contained in the outermost layer of one side, the mean particle size of the particles is specified to 0.2μm or less, and the thickness of the outermost layer is specified to 0.1μm or less. Further, the quantity of germanium contained in the film is specified to the range of 0.005-0.03wt.% of the polymer. When pancake manufactured in this manner is observed from the direction (1), slitting properties can be improved like a sample 3 as compared with a sample 2.
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公开(公告)号：JPH07186565A
公开(公告)日：1995-07-25
申请号：JP25697594
申请日：1994-10-21
Applicant: TORAY INDUSTRIES
Inventor： KAWAZU YUKIO , TSUNASHIMA KENJI , TOYODA KATSUYA , ANDO KATSUTOSHI
Abstract: PURPOSE:To realize high image characteristics and printing clarity by forming a netlike material having a fusion bonding point in which fibers of a porous support are fusion-bonded, and forming a film in which the fusion bonding point of parts of the material crosses between the fibers and its thickness is smaller than a mean fiber size. CONSTITUTION:A porous support made of polyester fiber is laminated on one side surface of a polyester film. The support is formed with a film in which a netlike material having a fusion bonding point in which fibers are fusion- bonded is formed and the fusion bonding point of parts of the material crosses between the fibers and its thickness is smaller than a mean fiber size. Such a support is thermally press-bonded, and biaxially co-oriented thereby to manufacture thermal stencil paper. Thus, high image characteristics and printing clarity are provided, and offset is eliminated.
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公开(公告)号：JPH07125063A
公开(公告)日：1995-05-16
申请号：JP27696993
申请日：1993-11-05
Applicant: TORAY INDUSTRIES
Inventor： YAMAKAWA TAKAMICHI , YASHIRO TOSHIYA , TOYODA KATSUYA
Abstract: PURPOSE:To obtain a film keeping excellent cracking resistance and excellent in ply separation resistance by specifying the surface orientation collapse index of the film and the F5 value in all directions within the plane of the film. CONSTITUTION:In a biaxially stretched polyester film, the surface orientation collapse index of the film is set to 5 or more, pref. to 10 or more and the min. value of the F5 value in all directions within the plane of the film is set to 7kg/mm or more, pref., to 10kg/mm or more. In order to obtain the biaxially stretched polyester film having these characteristics, the degree of crystallization of the film before biaxial stretching is set to 15-50%, pref., to 25-40%. The non-stretched film of which the degree of crystallization is set to 15-50% is heated by a heating roll at 100-160 deg.C and stretched longitudinally by 2-5 times over one stage or many stages to be cooled by a roll group held to 20-70 deg.C.
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