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公开(公告)号：JPH11227025A
公开(公告)日：1999-08-24
申请号：JP3306198
申请日：1998-02-16
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI , KUMAGAI TAKUYA
IPC: B29C48/305 , B29C48/92 , B29L7/00 , B29C47/14 , B29C47/92
Abstract: PROBLEM TO BE SOLVED: To provide a melt extrusion method capable of producing a sheet, a film, fibers, a molded product of a clean molten thermoplastic resin not containing thermally decomposed matter, gelled matter or foreign matter. SOLUTION: In a melt extrusion method supplying a thermoplastic resin to a melt extruder to melt and filter the same and extruding the filtered molten resin from a molding cap, the thermoplastic resin is molded while vibration is applied to the resin in the process from the melting process to the filtering process. The pressure of the molten resin in a vibration applying process is pref. set to a high pressure of 5 MPa or more. The thermoplastic resin is selected from a polyester, a polyolefin, polyphenylene sulfide and a polyamide.
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公开(公告)号：JPH11156922A
公开(公告)日：1999-06-15
申请号：JP32754797
申请日：1997-11-28
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI , OSADA SHUNICHI
IPC: B29C47/88 , B29K101/12 , B29L7/00
Abstract: PROBLEM TO BE SOLVED: To prevent induction of a sheet surface defect, a thickness irregularity, and a width fluctuation even when a thickness of the sheet is thick by a method wherein when a thermoplastic resin molten sheet is stuck close to a transfer cooling medium by impressing an electrostatic charge thereto, costing is executed by making a water liquid film lie only at both end parts of the thermoplastic resin sheet. SOLUTION: In a cast method wherein a thermoplastic resin molten sheet is cooled by sticking that close to a transfer cooling medium by impressing electrostatic charge thereto, intensive adhesion to the transfer cooling medium is obtained over the whole of a sheet width by improving adhesion at an end part by making a water liquid film lie practically only at both end parts of the thermoplastic resin sheet. A thickness of the water liquid film formed at the sheet end part is further preferably 0.03 to 0.2 μm. Formation of the water liquid film can be executed by applying a water film and a water drop. As a method wherein such the water film and the water drop are applied, a comparatively simple roller coating method is preferable. It is important that a surface roughness of the transfer cooling medium is 0.2 μm or under and smooth.
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公开(公告)号：JPH11115043A
公开(公告)日：1999-04-27
申请号：JP27867897
申请日：1997-10-13
Applicant: TORAY INDUSTRIES
Inventor： AEBA MIKA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To improve mechanical properties, heat-dimensional stability, ease of handling and shape in roll by specifying the proportion of thickness irregularities in the longitudinal direction and the width direction and further, perform an aging treatment under specific temperature conditions. SOLUTION: A biaxially stretched film with thickness irregularities of 0.3% or more and 5% or less in the longitudinal direction over a length of 10 m and 0.5% or more and 5% or less in the thickness direction, is subjected to an aging treatment at Tg -30 deg.C or less and Tg or less. In addition, in case the Fourier analysis of the wave-form of the thickness irregularities in the longitudinal direction over the length of 10 m is performed, the ratio Pw/PwT to the spectrum intensity sum PwT in the total wavenumber zone of a spectrum intensity sum Pw when the wavenumber is 1 (1/m) or more and 2 (1/m) or less, is preferably 0.15 or less, and more preferably the ratio Pw/Pwt is 0.1 or less.
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公开(公告)号：JPH1158498A
公开(公告)日：1999-03-02
申请号：JP22811097
申请日：1997-08-25
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI , OSADA SHUNICHI
IPC: B29C47/88 , B29K101/12 , B29L7/00
Abstract: PROBLEM TO BE SOLVED: To make it possible to realize adhesive properties across the entire width of a thermoplastic resin sheet and a high-speed casting process and further, stabilize stretching properties and coat formation by applying a static charge across a width which is larger than the entire width of the thermoplastic resin sheet to bring the resin sheet into contact tightly with a mobile cooling medium so that the melt sheet is cooled. SOLUTION: In a casting method by which a static charge is applied to a thermoplastic resin melt sheet to bring the melt sheet into contact tightly with a mobile cooling medium so that the melt sheet is cooled, the static charge is applied across a width which is larger than the entire width of the thermoplastic sheet. For this purpose, an electrode for bringing the center part of the sheet into contact tightly with the mobile cooling medium and an electrode for bringing the end part of the sheet into contact tightly with the medium are used. In addition, the applied voltage which is applied to the end part of the sheet is as low as about 5-15 kV so that discharge to the cooling medium is prevented from occurring, while the voltage to be applied to the center part of the sheet is as high as about 8-35 kV. Besides, the applied voltage which is applied to the end part of the sheet is lower than the voltage to be applied to the center part of the sheet.
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公开(公告)号：JPH1110727A
公开(公告)日：1999-01-19
申请号：JP16437897
申请日：1997-06-20
Applicant: TORAY INDUSTRIES
Inventor： YAMAGATA TETSUYA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To simplify a longitudinally orienting step and to suppress damage of a film surface and contamination of a roll by cooling to solidify melted polyester in a sheet-like state, then uniaxially orienting by a specific draw rate at a first stage and then orienting it in a direction perpendicular to the orienting direction. SOLUTION: After melted polyester is cooled to be solidified in a sheet-like state, it is oriented 4.5 times or more in one direction in an orienting zone of a first stage, and then oriented in a lateral direction. After biaxially orienting, it is heat treated. In this case, the polyester sheet is preferably initially oriented at a temperature of glass transition temperature (Tg1) of the film immediately before the orienting to 30 deg.C higher than the Tg1. And, it is preferable to use plasticizing material to upgrade its stretchability. As the material, gas at the ambient temperature and ordinary pressure or water vaporized at 100C or higher in a heat treating step and evaporating out of the film is used.
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Patent Agency Ranking
公开(公告)号：JPH10109353A
公开(公告)日：1998-04-28
申请号：JP19688797
申请日：1997-07-23
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , TSUNEKAWA TETSUYA , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To form a film excellent in gas barrier properties and high in the Young's modulus at a high speed by stretching an extruded molten polyamide by using a cooling drum held to a specific surface temp. range and having surface max. roughness of a specific value or less. SOLUTION: Extruded polyamide molten matter is brought into close contact with a cast drum held to surface temp. of 60-140 deg.C to be cooled and solidified. The surface material quality of a cooling drum is formed by amorphous chromium plating from an aspect of cracklessness, high hardness or ultra-smoothness and the surface max. roughness thereof is set to 2μm or less and an oligomer and/or monomer at a time of casting is hard to adhere and a crater is hard to generate on a surface even at a time of high speed casting, post-ductility is enhanced and a film can be produced at 300m/min or higher. As a polyamide raw material, there are a single polyamide raw material with relative viscosity of 2.5-5.5, and the raw material blended with other compd., for example, a liquid crystal polymer or other polyamide resin.
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公开(公告)号：JPH09300518A
公开(公告)日：1997-11-25
申请号：JP12151896
申请日：1996-05-16
Applicant: TORAY INDUSTRIES
Inventor： OSADA SHUNICHI , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To enhance tear resistance and mechanical characteristics by selecting polymers constituting the respective layers of a film laminated at least as two layers in its thickness direction from either one of at least two kinds of different thermoplastic resins and providing at least one layer of which the longitudinal refractive index is larger than a lateral refractive index. SOLUTION: The polymers constituting the respective layers of a film laminated in at least two layers in its thickness direction are selected from either one of at least two kinds of different thermoplastic resins. At least one layer wherein a refractive index in a longitudinal direction is larger than that in a lateral direction is provided to the laminated film. Herein, a layer wherein the refractive index in the longitudinbal direction of the laminated film is larger than that in the laterial direction thereof is a layer wherein the refractive index in the flow direction of the film is larger than that in the right-angled direction when the thermoplastic resin constitution that layer is biaxially stretched as a single film. By this constitution, tear strength and mechanical characteristics can be enhanced.
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公开(公告)号：JPH09254254A
公开(公告)日：1997-09-30
申请号：JP7039796
申请日：1996-03-26
Applicant: TORAY INDUSTRIES
Inventor： YAMAMOTO AKIKO , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To improve thickness uniformity and a stripe-like defect and to prevent the generation of meandering or wrinkles at a time of secondary processing by specifying the max. surface roughness of a film, the thickness of the film in the longitudinal direction thereof and the waveform of the thickness irregularity thereof. SOLUTION: A thermoplastic resin film is characterized by that the surface max. roughness thereof is 0.0005-0.5μm, the thickness irregularity in the longitudinal direction thereof is 4% or less and Pw1/PwT being the ratio of the spectrum strength sum Pw1 in a waveform of 0.15-0.45(1/m) at a time when the waveform of the thickness irregularity is subjected to Fourier analysis to the spectrum strength sum PwT within a total wave number band is 0.15 or less. Therefore, as a thermoplastic resin, polyester is pref. and a technique for enhancing rigidity by lowering the temp. of the resin between a die and a casting drum (L-D) in order to suppress film vibration between L-D when the resin is extruded into a sheet form is effective. The cooling for lowering the temp. of the resin is pref. performed at the land part being the outlet of a die.
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公开(公告)号：JPH0952457A
公开(公告)日：1997-02-25
申请号：JP20443995
申请日：1995-08-10
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , YOSHIDA MINORU , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To prevent a defect such as a wrinkle or the like from developing and improve printability, running properties and handleability by a method wherein the heat shrinkage factor in the longitudinal direction of a heat-sensitive transfer printer ribbon at a specified temperature is set to be a specified percentage. SOLUTION: The heat shrinkage factor in the longitudinal direction of a heat-sensitive transfer ribbon is set to be 1% or less at 100 deg.C and 2% or more at 150 deg.C, further preferably 0.7% or less at 100 deg.C and 4% or more at 150 deg.C. Furthermore, their widthwise heat shrinkage stresses at 100 deg.C and 210 deg.C are specified, respectively, to be 30g/mm or more and 60g/mm or more, preferably 100g/mm or more. The heat shrinkage factor in the longitudinal direction at 100 deg.C is indispensable for the prevention of the shrinkage and deformation of film during its long term storage under hot and humid conditions. In addition, the heat shrinkage factor at 150 deg.C is indispensable for the prevention of the development of a wrinkle due to the shrinkage and deformation caused by the contact with a heat sensitive head.
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公开(公告)号：JPH08252857A
公开(公告)日：1996-10-01
申请号：JP10001896
申请日：1996-04-22
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , AOKI SEIZO
IPC: C08J5/18 , B29C48/305 , B29C55/12 , B29C69/00 , B29K67/00 , B29L9/00 , B32B5/18 , B32B27/36 , B29C47/14
Abstract: PURPOSE: To provide a method for manufacturing a novel laminated white polyester film which exhibits white and which is scarcely cleaved even if fine numerous pores exist therein and has large breakage strength between layers. CONSTITUTION: A laminated white polyester film is manufactured by laminating a polyester layer in which the quantity not exceeding 30wt.% of polyolefin resin is added to polyester and polyalkyleneglycol or its copolymer of 0.5 to 5wt.% is added, and the other polyester layer A, extrusion molding it in a sheet state from a T die, and then supplying it to a biaxially orienting step.
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