Title:
ポリエチレン管の製造方法
Document Type and Number:
Japanese Patent JP4498578
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a polyethylene pipe which can effectively continuously stretch a thick item and prevent a resin from being crosslinked in an extruder even when high speed forming is conducted. SOLUTION: A method for manufacturing a polyethylene pipe comprises a raw material resin supply process of supplying a mixture obtained by kneading a raw material containing a polyethylene resin and a peroxide from an extruder into a die having a heat-crosslinking zone, a stretching zone and a cooling zone, a crosslinking process of heat-crosslinking the raw material resin in the heat-crosslinking zone to shape it into a pipe of the crosslinked resin, a stretching process of stretching it in the stretching zone to give a shape approximately similar to the formed item and a cooling process of cooling the shaped item to a temperature lower than an orientation relaxation temperature in the cooling zone, wherein an employed peroxide has one minute half life temperature of not lower than 190 deg.C.
Inventors:
Takehisa Sugaya
Tsuboi Kotaro
Akihiro Ogawa
Junichi Yokoyama
Tsuboi Kotaro
Akihiro Ogawa
Junichi Yokoyama
Application Number:
JP2000306500A
Publication Date:
July 07, 2010
Filing Date:
October 05, 2000
Export Citation:
Assignee:
Sekisui Chemical Co.,Ltd.
International Classes:
B29C47/78; C08J5/00; B29C47/10; B29C48/30; B29K23/00; B29K105/24; B29L23/00
Domestic Patent References:
| JP61002523A | ||||
| JP53115780A | ||||
| JP9115367A | ||||
| JP5220825A | ||||
| JP11513326A |