Title:
TUBE MANUFACTURING METHOD, EXTRUSION MOLDING MACHINE, MOLD FOR EXTRUSION MOLDING, WINDING DEVICE, AND TUBE
Document Type and Number:
WIPO Patent Application WO/2022/059501
Kind Code:
A1
Abstract:
This tube manufacturing method, in which a melt-processible fluorine resin extruded in a tubular shape from a mold provided in an extrusion molding machine is guided to a cooling device and cooled, and then a winding device is used to wind the cooled tube on a take-up reel, involves causing a gas to be circulated in a hollow section of the tube, by supplying the gas to the hollow section from a tip of the tube wound on the take-up reel, and by discharging the gas in the hollow section to the outside through a gas discharge hole provided in the mold from a gas introduction port provided in the mold, wherein the internal pressure of the hollow section is maintained at a pressure which is higher than atmospheric pressure and lower than 0.5 kgf/cm2.
Inventors:
IMAMURA HITOSHI (JP)
HAMADA HIROYUKI (JP)
MUKAI ERI (JP)
HAMADA HIROYUKI (JP)
MUKAI ERI (JP)
Application Number:
PCT/JP2021/032272
Publication Date:
March 24, 2022
Filing Date:
September 02, 2021
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
B29C48/09; B29C48/27; B29C48/28; B29C48/32; B29C48/885; B29C48/90; F16L11/06
Foreign References:
| JP2020002341A | 2020-01-09 | |||
| JP2008238664A | 2008-10-09 | |||
| JP2000233435A | 2000-08-29 | |||
| JP2000233435A | 2000-08-29 |
Attorney, Agent or Firm:
TOKOSHIE PATENT FIRM (JP)
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