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公开(公告)号：JP2000296528A
公开(公告)日：2000-10-24
申请号：JP10684599
申请日：1999-04-14
Applicant: TORAY INDUSTRIES
Inventor： SAKAMOTO JUN , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To obtain a product having an excellent productivity and quality with a simple facility by insulating a conductive portion of a surface of a charged roll from a core of the roll and manufacturing a cast sheet. SOLUTION: The sheet is directly charged, efficiently brought into close contact with a cooling medium, air entraining between the sheet and the medium or an instability of a bank mold is suppressed by the sheet sandwiched between the charged roll and the medium. A conductive portion of the surface of the charged roll is insulated from the core of the roll. In order to cool the surface of the roll even without passing an insulation refrigerant, the cooling medium used for the cooling medium is branched, guided to the charged roll to simplify an apparatus constitution and to simplify apparatus maintenance. If the charged roll and the cooling medium are discharged therebetween, only the conductive layer on the surface of the charged roll is damaged, but the surface of the charged roll is not largely roughed. Adverse influence is not effected to the surface of the film, and the damage is limited only to the surface layer and the roll can easily be recycled. Thus, a casting speed can be accelerated, and the sheet of high quality can be manufactured with good productivity.
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公开(公告)号：JP2000271987A
公开(公告)日：2000-10-03
申请号：JP7950799
申请日：1999-03-24
Applicant: TORAY INDUSTRIES
Inventor： SAKAMOTO JUN , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To perform excellent productivity and quality by coating a surface of a charging roll and/or a surface of a cooling medium with liquid before a molten sheet is brought into contact with the roll. SOLUTION: Before a molten sheet is brought into contact with a charging roll, a surface of the roll and/or a surface of a cooling medium is coated with liquid, and the sheet is cast while holding the sheet between the roll and the medium. Then, an oil film is formed between the roll and/or the medium and the sheet. If the roll is coated with the liquid, a gap is eliminated between the roll and the sheet by the film, and the charge of the roll is uniformly given to the sheet. If the medium is coated with the liquid, close adhesive properties of the sheet with the medium are further enhanced. Here, as the coating liquid, water or the like is used. After the formed sheet is released from the roll or the medium, liquid droplets retained on the surfaces are removed. Further, to uniformly coat the roll or the medium with the liquid as uniform droplets, humidified wet air is sprayed or the like.
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公开(公告)号：JP2000263641A
公开(公告)日：2000-09-26
申请号：JP7004199
申请日：1999-03-16
Applicant: TORAY INDUSTRIES
Inventor： AEBA MIKA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
IPC: B29C55/02
Abstract: PROBLEM TO BE SOLVED: To provide a roll for a film and a manufacturing method for a thermoplastic resin film which enable attainment of the thermoplastic resin film being free of a surface defect and having smoothness with excellent productivity. SOLUTION: A heating roll for forming a film which is used on the occasion of preheating or stretching a thermoplastic resin film in contact with the roll and which is so constituted that the thermoplastic resin film and the surface of the roll come into contact with each other with a liquid film interlaid on the surface of the roll and, besides, a manufacturing method of the thermoplastic resin film which uses the heating roll for forming the film on the occasion of preheating or stretching the thermoplastic resin film.
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公开(公告)号：JP2000234027A
公开(公告)日：2000-08-29
申请号：JP3689899
申请日：1999-02-16
Applicant: TORAY INDUSTRIES
Inventor： SAKAMOTO JUN , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
IPC: C08J5/18
Abstract: PROBLEM TO BE SOLVED: To obtain a sheet having excellent quality in good productivity by melting a thermoplastic resin, extruding the melt into a molten sheet, and solidifying the molten sheet by cooling its surface by insertion into between a charging roll composed of a metallic part and a non-metallic part and a cooling medium. SOLUTION: A thermoplastic resin such as a polyester resin is molten and extruded into a molten sheet. The molten sheet is cooled and solidified by insertion into between a charging roll with a surface composed of a metallic part and a non-metallic part (an areal coverage of 20-80%) and having an applied voltage of 100 V to 10 kV and a cooling medium such as a casting drum. If required, the sheet is heated to the glass transition temperature or higher and subjected to stretching and heat-treatment. The surface of the charging roll is composed of a metallic part such as carbon steel, stainless steel or those chrome-plated thereon and a non-metallic part such as a silicone resin and has a surface roughness of 1S or below. The drum acting as the cooling medium has a hard-chromium-plated surface and has a surface roughness of 0.5S or below.
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公开(公告)号：JPH11320577A
公开(公告)日：1999-11-24
申请号：JP13964298
申请日：1998-05-21
Applicant: TORAY INDUSTRIES
Inventor： TSUNASHIMA KENJI , OSADA SHUNICHI , MIYAGAWA KATSUTOSHI
Abstract: PROBLEM TO BE SOLVED: To stably heat without staining or damaging a surface of a metal roll or without sticking a thermoplastic resin melt sheet by using the roll made of a metal as a surface material heated to a surface temperature of a glass transition temperature or higher of the sheet in the case of heating the sheet. SOLUTION: In the case of heating a thermoplastic resin melt sheet, the sheet is heated by a metal roll of a metal as a surface material heated to a surface temperature of a glass transition temperature Tg1 or higher of a thermoplastic resin. At this time, a material of the roll is selected from an iron, copper, aluminum, stainless steel or the other. A gas is contained in the resin having a glass transition temperature of Tg0 , and a thermoplastic resin sheet in which the transition temperature is lowered to the Tg1 may be used. At this time, the gas is selected from a carbonic acid gas, oxygen, nitrogen, air and their mixture gases. Further, an orienting temperature of the resin sheet is set to a range of Tg1 to Tg0 , and the sheet may be heated or oriented.
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Patent Agency Ranking
公开(公告)号：JPH11300809A
公开(公告)日：1999-11-02
申请号：JP10645498
申请日：1998-04-16
Applicant: TORAY INDUSTRIES
Inventor： KUMAGAI TAKUYA , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
IPC: B29C47/06 , B29C47/08 , B29K101/12 , B29L7/00
Abstract: PROBLEM TO BE SOLVED: To provide a composite extrusion method for a thermoplastic resin by which a good laminated surface is formed and the lamination thickness is made highly uniform and further the lamination ratio is easily controlled. SOLUTION: The composite extrusion method for a thermoplastic resin is to supply the thermoplastic resin to an extrusion machine and make plural molten polymer streams confluent after fusion and filtering to form a lamination structure. In a step to extrude the laminated polymer resin from a molding mouthpiece, at least one process to impart a vibration is included.
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公开(公告)号：JPH11216759A
公开(公告)日：1999-08-10
申请号：JP2312798
申请日：1998-02-04
Applicant: TORAY INDUSTRIES
Inventor： OSADA SHUNICHI , TSUNASHIMA KENJI , MIYAGAWA KATSUTOSHI
IPC: B29C47/88 , B29C48/305 , B29C55/16 , B29K101/12 , B29L7/00 , C08J5/18 , B29C47/14
Abstract: PROBLEM TO BE SOLVED: To improve moldability of the end part of a cast film in case of film formation of a biaxially oriented film, to decrease fluctuation of physical properties in the neighborhood of the end part of the biaxially oriented film, and to improve productivity by remarkable improvement of film forming speed. SOLUTION: After a molten state thermoplastic resin sheet is molded in such a way that heat transfer coefficient (he) on the end part of the thermoplastic resin sheet and heat transfer coefficient (hc) of the central part of the sheet satisfy the formula 0.36
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公开(公告)号：JPH09295344A
公开(公告)日：1997-11-18
申请号：JP4924397
申请日：1997-03-04
Applicant: TORAY INDUSTRIES
Inventor： MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI , YAMAGATA TETSUYA
Abstract: PROBLEM TO BE SOLVED: To provide not only a longitudinal orientation method with a small coefficient of contraction in width, but also a manufacture with a reduced physical unevenness in width after the biaxial orientation, good thickness uniformity, and excellent productivity. SOLUTION: The manufacture of a film is such that after a first orientation is executed, a biaxial orientation is performed by executing a second orientation in the direction normal to the first orientation and thus the orientation of a thermoplastic resin film is done by the use of a file where a film from factor D before the first orientation is 3 or lower. However, the film from factor D is to be a rate (de/dc) of an average thickness (dc) of the film central part with respect to the maximum thickness (de) of the film end part. In this manner, a coefficient of contraction in width becomes small in its orientation in the longitudinal direction, and physical unevenness in the width direction of the biaxially oriented film is small, so that the uniformity of the thickness is significantly improved in order to retain high productivity.
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公开(公告)号：JPH0929833A
公开(公告)日：1997-02-04
申请号：JP20395895
申请日：1995-07-18
Applicant: TORAY INDUSTRIES
Inventor： AEBA MIKA , MIYAGAWA KATSUTOSHI , TSUNASHIMA KENJI
Abstract: PROBLEM TO BE SOLVED: To provide less heat shrinkage, heat resistant flexibility, transparency and antistatic properties and no curl after passing a copying machine by specifying the shrinkage differential value of a specific temperature range, the temperature range of a fine heat absorbing peak appearing before crystal melting by a differential scanning calorimeter, and a film haze. SOLUTION: This film for an overhead projector having a biaxially oriented polyester film has 0.3% or less of heat shrinkage of 30min at 150 deg.C, and always 0.01% or less of a shrinkage differential value dL/dT (L: length, T: temperature) in a temperature range of glass transition point to 200 deg.C in the differential curve of the true shrinkage in the longitudinal direction of the film obtained from the stretching or shrinkage amount at the time of temperature rise or fall by a thermomechanical characteristic tester. The differential heat absorbing peak appearing before the crystal melting by a differential scanning calorimeter is a range of a melting point to (melting point -30 deg.C). Further, the film haze at that time is 10% or less.
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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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