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公开(公告)号：JPH09164588A
公开(公告)日：1997-06-24
申请号：JP32876395
申请日：1995-12-18
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , AEBA MIKA
Abstract: PROBLEM TO BE SOLVED: To obtain a high strength film by stretching a uniaxially oriented film satisfying a predetermined relational expression in the relation between double refraction and density in the direction vertical to the main orientation direction thereof. SOLUTION: A uniaxially oriented film satisfying formula 2.14d/1000-2.78 ) is stretched in the direction vertical to its orientation direction. A polyester film extruded in a molten state to be molded into a sheet form on a cooling roll is stretched at temp. of below the glass transition point thereof to be subjected to uniaxial orientation and this film is stretched in the direction vertical to the uniaxial stretching direction to be biaxially oriented to form a biaxially oriented film. Herein, the biaxially oriented film is a film to which molecular orientation is applied in two longitudinal and lateral directions by longitudinally and laterally stretching the film. Generally, polyester extruded in a molten state is cooled on a casting drum and successively stretched longitudinally and laterally to obtain a biaxially oriented film.
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公开(公告)号：JPH0952461A
公开(公告)日：1997-02-25
申请号：JP16672596
申请日：1996-06-05
Applicant: TORAY INDUSTRIES
Inventor： NAKAHARA KATSUJI , MIYAGAWA KATSUTOSHI , MIMURA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To provide a heat transfer image receiving body, which has favorable printing running properties, dot reproducibility and ink transferability and which is excellent in printing quality such as gradation, clearability or the like. SOLUTION: In a heat transfer image receiving body, the base material of which is made of a white polyester film having the optical density of 0.3-1.6 and the whiteness index of 50-110%, an ink receiving layer, the smoothness of which is 500-20,000sec, is applied on one side of the base material and on the opposite surface side of which an easily slidable layer having a static friction coefficient to the ink receiving layer of 1.5 or less is applied.
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公开(公告)号：JPH0952460A
公开(公告)日：1997-02-25
申请号：JP16672496
申请日：1996-06-05
Applicant: TORAY INDUSTRIES
Inventor： NAKAHARA KATSUJI , MIYAGAWA KATSUTOSHI , MIMURA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To provide a heat transfer image receiving body, which has favorable printing running properties, dot reproducibility and ink transferability and which is excellent in printing quality such as gradation, clearability or the like. SOLUTION: In a heat transfer image receiving body, the base material of which is made of a white polyester film having the thermal conductivity of 0.5×10 -3×10 cal/cm.s. deg.C and the whiteness index of 50-110%, an ink receiving layer, the smoothness of which is 500-20,000sec, is applied on one side of the base material and on the opposite side of which an antistatic layer having the surface resistance of 5×10 Ω/square or less is applied.
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公开(公告)号：JPH08281777A
公开(公告)日：1996-10-29
申请号：JP11017595
申请日：1995-04-10
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , OKASHIRO HIDETOSHI , TOYODA KATSUYA
IPC: B29C47/06 , B29C47/80 , B29C47/86 , B29C47/88 , B29C48/305 , B29C48/74 , B29L9/00 , B29C47/14 , B29C47/74
Abstract: PURPOSE: To suppress cap stripes while reducing thickness irregularity by dividing the flow of a thermoplastic resin into a plurality of passages and cooling at least one passage to temp. lower than extrusion temp. but equal to or higher than temp. falling crystallization start temp. and laminating the thermoplastic resins from both passages to extrude them from a cap. CONSTITUTION: The flow of the thermoplastic resin melted in an extruder is divided into a plurality of passages and at least one passage is cooled to temp. lower than the extrusion temp. of the thermoplastic resin from the extruder but equal to or higher than the temp. falling crystallization start temp. of the thermoplastic resin. Next, the thermoplastic resins sent from the respective passages are laminated to be extruded from a cap and the extrudate is molded on a cooling roll. As the thermoplastic resin, a polyolefin resin, a polyamide resin or a polyester resin is used. A melt extrusion method is performed using the extruder and the flow of the molten resin is divided into a plurality of passages to increase a cooling specific area and the surface of the thermoplastic resin is held to non-solidifying temp. without extending passage length.
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公开(公告)号：JPH08253610A
公开(公告)日：1996-10-01
申请号：JP10001796
申请日：1996-04-22
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , AOKI SEIZO
IPC: C08J9/00
Abstract: PURPOSE: To obtain the subject film having high cleavage strength, mechanical strength, heat-resistance and whiteness and useful as a substitute for paper by adding a polyolefin resin and a polyethylene glycol to a polyester at prescribed ratios. CONSTITUTION: This biaxially drawn film having a cleavage strength of >=300g/15mm and composed of a polyester layer containing innumerable fine bubbles is produced by incorporating (A) a polyester with (B)
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Patent Agency Ranking
公开(公告)号：JPH08244111A
公开(公告)日：1996-09-24
申请号：JP8328695
申请日：1995-03-14
Applicant: TORAY INDUSTRIES
Inventor： HOTTA KUNIHIRO , MIYAGAWA KATSUTOSHI , AEBA MIKA
Abstract: PURPOSE: To obtain a polyester film excellent in low heat shrinkability and prevented from the deterioration of flatness at the time of pressure feed accompanied by thermal softening by setting the heat shrinkage factors in the longitudinal and lateral directions of the film to a specific ratio and setting the penetration distance of a pin at a time when the pin is pressed to the film under a specific condition to specific % or less of the thickness of the film. CONSTITUTION: The heat shrinkage factors in the longitudinal and lateral directions of a film are 0.3% or less and, when a pin with a leading end diameter of 0.8mm is pressed to the film under such a condition that pressure load is 10g and a temp. rising speed is 5 deg.C/min, the penetration start temp. of the pin to the film is 115 deg.C or higher and the penetration distance of the pin is set to 8% or less of the thickness of the film. This film is subjected to high temp. heat treatment for imparting low heat shrinkabillty, flatness and thermal softening resistance but, in the case of polyethylene terephthalate, rapid temp. rising short-time treatment is performed at 225-255 deg.C. After the film is cooled to about 210 deg.C or lower under tension, the film is pref. subjected to relax treatment because relaxation of molecular orientation can be suppressed and thermal softening resistance is imparted.
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公开(公告)号：JPH08132523A
公开(公告)日：1996-05-28
申请号：JP27487094
申请日：1994-11-09
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TOYODA KATSUYA , AEBA MIKA
Abstract: PURPOSE: To obtain a polyester film reduced in its heat shrinkage factor inexpensively and sufficiently in the machine direction and having good flatness by specifying the shrink quantity differential value and heat shrinkage factor in the differential curve of the real shrink quantity in the machine direction of the film calculated from the extension and retraction quantities at the times of temp. rise and temp. drop due to a thermal and mechanical characteristic tester. CONSTITUTION: In a biaxially oriented film composed of polyester, the shrink quantity differential value dL/dT of the film is always set to 0.01%/ deg.C or less within a range from the glass transition point of polyester to 200 deg.C in the differential curve of the real shrink quantity in the machine direction of the film calculated from the extension and retraction quantities at the times of temp. rise and temp. drop due to a thermal and mechanical characteristic tester. Further, the 20-min heat shrinkage factor in the machine direction of the film at 190 deg.C is set to 1.0% or less. Therefore, heat treatment temp. is set to the range from the start temp. of a melting endothermic peak in DSC to the temp. of the apex of the peak. In order to absorb reversible shrinkage accompanied by cooling from the heat treatment of a tenter, a clip interval is contracted while the film is grasped by the clips of the tenter.
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公开(公告)号：JPH06262676A
公开(公告)日：1994-09-20
申请号：JP5096293
申请日：1993-03-11
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TOYODA KATSUYA , TSUNASHIMA KENJI
Abstract: PURPOSE:To produce a plastic film stretched at least in its lateral direction without generating thickness irregularity or a rupture by making the temp. of the central part of a film higher than that of both end parts thereof up to the period immediately before inserting the film in a tenter. CONSTITUTION:In the production of a plastic film stretched in its lateral direction by a tenter, both end parts 3 of a film 1 are inserted in heaters 4 immediately before the film 1 is inserted in the tenter in the state grasped by tenter clips 2 and the both end parts 3 of the film 2 are heated to temp. higher than that of the central part thereof. That is, the central part of the thin film is immediately heated to predetermined temp. even if the film is guided to the tenter at room temp. but, by preliminarily raising the temp. of both end parts 3 of the film, the temp. difference between the central part and both end parts 3 of the film is reduced during the preheating period of the tenter. By this constitution, in the preheating condition of the tenter, the optimum condition same in the central part and both end parts of the film can be taken.
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公开(公告)号：JPH06262675A
公开(公告)日：1994-09-20
申请号：JP5096193
申请日：1993-03-11
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TOYODA KATSUYA , TSUNASHIMA KENJI
Abstract: PURPOSE:To produce a laterally stretched plastic film reduced in bowing phenomenon and uniform in physical properties in the lateral direction thereof by cooling a film to a predetermined value or less before the heat treatmet process after lateral stretching and setting the temp. rising speed in the heat treatment process to a predetermined value or more. CONSTITUTION:In the production of a plastic film heat-treated after stretched at least in the lateral direction thereof by a tenter, a cooling process cooling a laterally stretched film to 70 deg.C or lower before a heat treatment process is provided and the temp. rise speed of the film in the heat treatment process is set to 1000 deg.C/sec or more. The longitudinal shrink stress of the film is cut at a time of lateral stretching by providing the cooling process but, since the thermal shrinkage of the film at a time of the application of heat is generated before the heat treatment process, a bowing phenomenon can not be prevented only by providing the cooling process. However, since thermal shrinkage stress becomes low by increasing the temp. rising speed, the thermal shrinkage stress can be prevented by setting the temp. rising speed to 1000 deg.C/sec or more.
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80.发明专利
公开(公告)号：JPH06226937A
公开(公告)日：1994-08-16
申请号：JP1482193
申请日：1993-02-01
Applicant: TORAY INDUSTRIES
Inventor： UHARA KENJI , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PURPOSE:To obtain white-colored polyester film excellent in dimensional heat stability, flexibility and cushioning property, low in specific gravity and difficult to cause wrinkles by folding. CONSTITUTION:The white-colored film comprises at least two layers: one (referred to as layer A) consists of a composition having the components of polyester (a), polymer (b) incompatible with polyester and polyester-polyether copolymer (c) and the other (referred to as layer B) is a film layer substantially lower in Young's modulus than the layer A. This film is whitened by incorporating fine air bubbles in the layer A and has an apparent specific gravity of 0.5-1.1.
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