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公开(公告)号：JP2000301595A
公开(公告)日：2000-10-31
申请号：JP11484099
申请日：1999-04-22
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , SAKAMOTO JUN
Abstract: PROBLEM TO BE SOLVED: To prevent the formation of the surface defect of a roll by preventing the discharge to a cooling roll at the time of generation of air bubbles in a molten sheet inevitable when a moltn polymer sheet is brought into close contact with the cooling roll by the application of static electricity. SOLUTION: In a molding apparatus for molding a molten polymer sheet extruded from a cap by bringing the molten polymer sheet into close contact with a cooling roll by electrostatic force to cool the same, an earth electrode is provided at the position holding the molten polymer sheet corresponding to a static electricity applying electrode and the value of a current flowing to the earth electrode is monitored. This molding apparatus is used to bring the molten polymer sheet into close contact with the cooling roll and, when a defect such as air bubbles is generated in the molten polymer sheet, the value of the current flowing to the grounding electrode is monitored before the discharge to the cooling roll is generated to stop the application of static electricity.
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公开(公告)号：JP2000127217A
公开(公告)日：2000-05-09
申请号：JP30206198
申请日：1998-10-23
Applicant: TORAY INDUSTRIES
Inventor： KUMAGAI TAKUYA , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
IPC: B29C47/86 , B29C48/305 , B29C48/92 , B29K101/12 , B29L7/00 , B29C47/14 , B29C47/92
Abstract: PROBLEM TO BE SOLVED: To achieve thickness accuracy and the cost reduction of productivity by reducing temp. irregularity in a lateral direction when a molten thermoplastic resin is to be cooled in the land part of a flat die. SOLUTION: A thermoplastic resin is heated to melting completion temp. Tme or higher to be melted and the molten thermoplastic resin is cooled to temp. below Tme and higher than temp. drop crystallization start temp. Tab in the land part 4 of a flat die 1 and the cooled resin is extruded from the flat die 1 to obtain a sheet like article. In this case, a hole 2 is provided in the flat die 1 and a heating pipe is inserted into this hole 2 and cooled to cool the thermoplastic resin.
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公开(公告)号：JPH11254576A
公开(公告)日：1999-09-21
申请号：JP5517698
申请日：1998-03-06
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , AEBA MIKA , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To obtain a suitable biaxially oriented film without curl or the like for an application of an IC card or the like used by superposing a plurality of the films and its structure. SOLUTION: The film structure is obtained by laminating at least two or more layers of biaxially oriented films each having a compression elastic modulus of 300 mg/μm or less. Or, as another embodiment, at least two or more layers of biaxially oriented films having a difference of a maximum value and a minimum value of a heat shrinkage factor at 150 deg.C in all directions in a film surface of 0.3% or less are laminated.
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公开(公告)号：JPH11207815A
公开(公告)日：1999-08-03
申请号：JP965198
申请日：1998-01-21
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , KUMAGAI TAKUYA
Abstract: PROBLEM TO BE SOLVED: To produce 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 prevent the same. SOLUTION: The temp. of a resin at a time of the extrusion from a cap is set to a temp. range from below the fusion completion temp. of the resin to the crystallization start temp. thereof and, after the resin is molded into a sheet, this sheet is quenched and solidified on a cooling roll to be subsequently subjected to biaxial stretching. By this constitution, thickness uniformity is markedly improved and the trouble of meandering or wrinkles at a time of secondary processing can be avoided.
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公开(公告)号：JPH11198228A
公开(公告)日：1999-07-27
申请号：JP411798
申请日：1998-01-12
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , OSADA SHUNICHI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To provide a method for coating water-based coating material or the like having good productivity and quality such as thickness irregularities during a film making process, a manufacturing method of a film employing the method, and also form a simultaneously biaxially orientated film that combines high quality and high productivity done by the method. SOLUTION: The inline coating method is featured such that after a molten resin film is allowed to be in close contact with a cooling medium to thereby be solidified by cooling and then a coating material is applied to the cooled film surface, simultaneously blaxial orientation is carried out at a high orientation speed of 10 %/min or more in both the longitudinal direction and lateral direction. Also, the film manufacturing method employs an inline-coating method. In addition, a simultaneously biaxially orientated film is obtained by the manufacture, and includes a coating material layer having a thickness of 0.005-0.5 μm on the film surface.
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Patent Agency Ranking
公开(公告)号：JPH11170357A
公开(公告)日：1999-06-29
申请号：JP35608497
申请日：1997-12-09
Applicant: TORAY INDUSTRIES
Inventor： OSADA SHUNICHI , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To reduce the variation in the widthwise physical properties after the biaxial stretching of a film so as to improve its productivity by a method wherein the film is heated by at least a non-contact heat source having a speci fied range between values in kW/m. SOLUTION: As the pre-heating method of a film by means of a plurality of set of rolls in a stretching process performed between slow speed rolls and high speed rolls for stretching lengthwise by means of the difference between the peripheral speeds of the rolls, a method for contacting with heating rolls or a method for heating with an infrared heater is employed. As a heating method for stretching at a desired temperature, the film is heated in a non- contact heat source having the heating capacity of 30-200 kW/m. If a heat source having the heating capacity larger than 200 kW/m, a device itself becomes too large, resulting in making the shortening of a stretching section difficult. In this case, in order to shorten the stretching section, the heat source is favorably located between the slow speed rolls and the high speed rolls. The nearer its location is to the contact position of the thermoplastic resin film and the high speed rolls, the favorabler the shortening of the section becomes.
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公开(公告)号：JPH10278157A
公开(公告)日：1998-10-20
申请号：JP9209797
申请日：1997-04-10
Applicant: TORAY INDUSTRIES
Inventor： OSADA SHUNICHI , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
IPC: B32B7/02
Abstract: PROBLEM TO BE SOLVED: To realize a high strength film and improve the tearing resistance and shock resistance of a film by a method wherein the relationship between the absolute value of the difference between the longitudinal refractive index and the lateral one of at least one layer of thermoplastic resin films and the absolute value of the difference between the longitudinal refractive index and the lateral one of the whole films is specified. SOLUTION: The laminated film is made of thermoplastic resin and formed by laminating at lest two layers or more of the film in the direction of its thickness. In this case, the absolute value of the difference between the longitudinal refractive index and the lateral one of at least one layer of the laminated film is set to be larger than the absolute value of the difference between the longitudinal refractive index and the lateral one of the whole films by 0.02 or more. The preferable number of layers is 3-200 layers, especially 5-64 layers. As the technique of the above-mentioned lamination, a melt and simultaneous extrusion method through a die under the state of respective layers being laminated by a coextrusion method such as a multimanifold die method, a feed block method or a static mixer method is preferable.
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公开(公告)号：JPH10272672A
公开(公告)日：1998-10-13
申请号：JP9520497
申请日：1997-03-28
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , TSUNEKAWA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To obtain a highly rigid and high quality film by a method wherein a mixed polyester, which is prepared by incorporating liquid crystalline polyester in a non-liquid crystalline polyester, is melted at the temperature higher than the crystalline-melting end temperature of the mixed polyester, and then cooled to the temperature, which is below the crystalline-melting end temperature and higher than a temperature lowering crystallization-starting temperature so as to be extruded through a mouthpiece in order to be formed into a sheet. SOLUTION: The crystalline-melting end temperature of a mixture, in which 0.5 wt.% of a liquid crystalline polyester is included in a non-liquid crystalline polyester is 268 deg.C, and its temperature lowering crystallization-starting temperature is 203 deg.C. After a polyethylene telephthalate and the liquid crystalline polyester are dried and dehydrated under vacuum at 160 deg.C, the mixture is fed to a tandem extruder, in which two extruders are connected in tandem. In the first extruder, the mixture is turned into a molten state at 290 deg.C. The set temperature of the second extruder is 240 deg.C. A film, which is extruded through a T-die mouthpiece after being passed through a fiber-sintered stainless steel filter, is taken off on a casting drum, the surface temperature of which is kept at 25 deg.C, by the drafting ratio of 20 under the state being applied with static electricity so as to be quenched and solidified. The Young's modulus of the obtained film is high and excellent.
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公开(公告)号：JPH10180844A
公开(公告)日：1998-07-07
申请号：JP2918397
申请日：1997-02-13
Applicant: TORAY INDUSTRIES
Inventor： OKUDA AKIKO , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To lessen stain of oligomer in making a film by lessening oozing out of the oligomer on a film surface by a method wherein an extracted oligomer amount on a surface of a polyester film obtained by a melt extrusion method is specified. SOLUTION: An extracted oligomer amount on a surface of a polyester film obtained by a melt extrusion method is made under 2.0mg/m . Further, the polyester film contains 0.6-1.4wt.% of oligomer content, and a ratio of a linear constituent contained in the extracted oligomer on the film surface is under 30%. Therefore, the polyester film is manufactured by a method wherein after heating once polyester resin at a temperature of a melting end temperature or higher to and excluding a thermal decomposition start temperature in a melt part of an extruder, it is cooled so that a surface temperature of a sheet like melt resin at an outlet of a flat die becomes a temperature of under a melting end temperature down to and including descent temperature crystallization start temperature, and the sheet like melt resin is preferably cooled with the flat die or the like.
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公开(公告)号：JPH10138331A
公开(公告)日：1998-05-26
申请号：JP29496196
申请日：1996-11-07
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To prevent process contamination and to eliminate a surface stain at a time of film formation by biaxially stretching film from such a state that the glass transition temp. of the film immediately before first. stretching is lowered to a specific temp. range as compared with a polyester resin being a raw material. SOLUTION: A biaxially stretched and oriented polyester film is obtained by cooling polyester extruded in a molten state on a casting drum and longitudinally and laterally stretching an amporphous non-oriented film formed into a sheet shape in succession or stretching the same longitudinally or laterally at the same time. The film is biaxially oriented from such a state that the glass transition temp. of the film immediately before first. stretching is lowered to a specific temp. range as compared with a polyester resin being a raw material by 5-30 deg.C. When the glass transition temp. is below 5 deg.C, effect is hard to obtain and, when the glass transition temp. is lowered so as to exceed 30 deg.C, crystallization is easy to advance until first stretching is started after the film is cast and there is possibility obstructing stretchability.
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