公开(公告)号：JP2001260210A

公开(公告)日：2001-09-25

申请号：JP2000071964

申请日：2000-03-15

Applicant: TORAY INDUSTRIES

Inventor： MIYATA SATOSHI ,  KOTOURA MASAAKI ,  TOYODA KATSUYA

IPC: B29C47/88

Abstract: PROBLEM TO BE SOLVED: To elevate the upper limit of a sheet molding speed preventing the generation of defects in a thermoplastic resin sheet in an electrostatic casting method. SOLUTION: In a method for producing the thermoplastic resin sheet, when the thermoplastic resin is extruded from a nozzle into a sheet, and the sheet is contacted with a cooling drum by the electrostatic casting method, cooled, and solidified for molding, the sheet is charged electrostatically by using tape- shaped electrodes, and a member which is different in shape or material from a member for preventing discharge to the cooling drum is fitted to the tip of the member.

公开(公告)号：JPH11309772A

公开(公告)日：1999-11-09

申请号：JP13611698

申请日：1998-04-30

Applicant: TORAY INDUSTRIES

Inventor： MIYATA SATOSHI ,  TOYODA KATSUYA ,  FUNAYAMA NOBUTAKA

IPC: B29C47/88 ,  B29C48/305 ,  B29K101/12 ,  B29L7/00 ,  B29C47/14

Abstract: PROBLEM TO BE SOLVED: To increase the upper limit of a sheet forming speed by giving electrostatic charges to a sheet by means of a tape-like electrode and a destaticization is executed at the separation of the sheet. SOLUTION: Electrostatic charges are uniformly given with a tape-like electrode 3 to a melt thermoplastic resin 2 extruded in a sheet out of a mouthpiece 1. An electrostatically charged resin sheet is cooled and solidified on the surface of a cooling drum 4 as the cooling drum 4 rotates so as to form a resin sheet 5, which is separated at its release point 6 so as to be sent through proper guide rolls 7, 8 and 9 to the following process. In this case, a destaticization is executed at a position ahead the release point 6. Since the resin sheet is uniformly given by electrostatic charges and the electrostatic charges are destaticized at the separation of the resin sheet, the favorably tightly adhered state of the resin sheet to the cooling drum is ensured so as to allow to suppress the development of ununiform application and the discharge between the sheet and the drum, resulting in allowing to increase the upper limit speed at the molding of the sheet.

公开(公告)号：JP2001054928A

公开(公告)日：2001-02-27

申请号：JP2000157843

申请日：2000-05-29

Applicant: TORAY INDUSTRIES

Inventor： MIYATA SATOSHI ,  HASEGAWA MASAHIRO ,  NISHITANI TOSHIO

IPC: B29C47/88 ,  B29C47/08

Abstract: PROBLEM TO BE SOLVED: To drastically increase the upper limit of a sheet molding speed not generating a flaw in a thermoplastic resin sheet in a static electricity applying casting method. SOLUTION: A thermoplastic resin is extruded in a sheetlike form from a cap to be closely brought into contact with a cooling drum 3 by a static electricity applying casting method and the sheet 2 is molded while cooled and solidified. At this time, static charge is applied to the sheet 2 by using a tape-shaped electrode 5 and the static charge quantity applied to both end parts of the sheet 2 is made smaller than that applied to the central part of the sheet 2 to produce a thermoplastic resin sheet.

公开(公告)号：JP2001252964A

公开(公告)日：2001-09-18

申请号：JP2000066153

申请日：2000-03-10

Applicant: TORAY INDUSTRIES

Inventor： KOTOURA MASAAKI ,  MIYATA SATOSHI ,  TOYODA KATSUYA

IPC: B29C47/88

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin sheet which, in a static electricity applying cast method using tape electrodes, can remarkably increase the upper limit of a sheet molding speed which prevents the generation of the defect of electricity application nonuniformity in the sheet and an apparatus for the method. SOLUTION: In the method for producing the sheet, when a molten thermoplastic resin is extruded from a nozzle into a sheet, and the sheet is made to adhere to a cooling drum by the static electricity applying cast method, cooled, and solidified for molding, an electrostatic charge is applied to the sheet by using the tape electrodes, and ionized air is sprayed to both end parts of the sheet. The apparatus for the method is provided.

公开(公告)号：JP2004255695A

公开(公告)日：2004-09-16

申请号：JP2003048700

申请日：2003-02-26

Applicant: TORAY INDUSTRIES

Inventor： FUJII HIDEKI ,  HAYASHI KOJI ,  MIYATA SATOSHI

IPC: G01N21/892 ,  B29C47/88 ,  B29C48/92 ,  B29K67/00 ,  B29C47/92

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin sheet which can improve the yield and quality of the sheet and a device for detecting a fault. SOLUTION: The thermoplastic resin sheet is produced by using an electrostatic application device having a cooling drum and electric discharge electrodes formed above the drum. In the method, when a fault is detected by the fault detecting device, a countermeasure means is instructed and monitored by the fault detecting device to adjust production conditions. COPYRIGHT: (C)2004,JPO&NCIPI

公开(公告)号：JP2002337175A

公开(公告)日：2002-11-27

申请号：JP2001142864

申请日：2001-05-14

Applicant: TORAY INDUSTRIES

Inventor： YAMAMOTO HIROMI ,  MIYATA SATOSHI ,  YUSHIO HARUHISA

IPC: B29C41/50 ,  B29C41/26 ,  B29C41/52 ,  B29L7/00

Abstract: PROBLEM TO BE SOLVED: To provide a method and equipment for manufacturing a thermoplastic resin sheet which enable reduction of a defect of the thermoplastic resin sheet, regulation of a change in position of an electrode, and reduction of the nonuniformity in thickness as a defect of the sheet, in regard to an electrostatic impression casting method. SOLUTION: In regard to a method, a thermoplastic resin is extruded in the shape of a sheet from a diehead and brought into closed contact with a cooling drum in the electrostatic impression casting method, and a sheet-shaped material thus obtained is solidified by cooling for molding. An electrostatic charge is given to the sheet-shaped material by using a tape-shaped electrode, and also the change in position of the tape-shaped electrode is regulated by using a guide slit in the present method for manufacturing the thermoplastic resin sheet. The equipment for manufacturing the thermoplastic resin sheet has the tape-shaped electrode for giving the electrostatic charge to the sheet- shaped material and the guide slit for regulating the change in position of this electrode.

公开(公告)号：JP2002307532A

公开(公告)日：2002-10-23

申请号：JP2001119391

申请日：2001-04-18

Applicant: TORAY INDUSTRIES

Inventor： MIYATA SATOSHI ,  YAMAMOTO HIROMI ,  YOROZU SHUNICHI

IPC: B29C47/88 ,  B29K101/12 ,  B29L7/00

Abstract: PROBLEM TO BE SOLVED: To provide a device for manufacturing a thermoplastic resin sheet which does not cause a flaw in the sheet and improves its molding stability in the manufacture of the sheet by an electrostatic application and cooling process as well as a method for manufacturing the sheet. SOLUTION: In the method for manufacturing the thermoplastic resin sheet using the electrostatic application and cooling process, the device for manufacturing the thermoplastic resin sheet is of such a structure that the lower end face of a tape-like electrode wound around a reel on the electrode pay-off side, is paid off from the reel without coming into contact with whatever object positioned right under the lower end face. Also, the method for manufacturing the sheet is provided.

公开(公告)号：JP2001252965A

公开(公告)日：2001-09-18

申请号：JP2000068422

申请日：2000-03-13

Applicant: TORAY INDUSTRIES

Inventor： KOTOURA MASAAKI ,  MIYATA SATOSHI ,  TOYODA KATSUYA

IPC: B29C47/88

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a thermoplastic resin sheet in which in a static electricity applying cast method using tape electrodes, the generation of the defect of electricity application nonuniformity in the sheet is prevented stably for a long time. SOLUTION: In the method for producing the sheet, when a thermoplastic resin is extruded from a nozzle into a sheet, and the sheet is made to adhere to a cooling drum by the static electricity applying cast method, cooled, and solidified for molding, an electrostatic charge is applied to the sheet by using the tape electrodes which have a rectangular cross section of a uniform form in the longitudinal direction and are made of stainless steel containing at least 10 wt.% of nickel.