Title:
METHOD OF PRODUCING POLYOLEFIN RESIN COATED STEEL PIPE HAVING WELD BEAD
Document Type and Number:
Japanese Patent JP2019055540
Kind Code:
A
Abstract:
To provide a method for producing a polyolefin resin coated steel pipe that can be uniform a film thickness of a bead part and a base material even if a peripheral speed at a time of conveyance of the steel pipe is increased, in a method of producing a three-layer polyolefin resin coated steel pipe using a steel pipe having a bead in an axial direction of an outer surface.SOLUTION: In the present invention, in order to prevent a film thickness of a polyolefin resin in a bead part from becoming thin, an injection 6 is added immediately before a T-die 8 to which the polyolefin resin is supplied, so that the bead part is detected against a rotating steel pipe 1 in a constant cycle. A polyolefin resin is instantaneously injected using injection 6 so that the film thickness of the polyolefin resin coated on the bead part to be detected becomes thick, and the film thickness of the bead part and the base material part is uniform.SELECTED DRAWING: Figure 3
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Inventors:
YOSHIZAKI NOBUKI
MIYAJIMA YOSHIHIRO
FUKUDA MASAHITO
HAMABE YUSUKE
AIGA TAKEHIDE
SAITO AKIHIRO
MIYAJIMA YOSHIHIRO
FUKUDA MASAHITO
HAMABE YUSUKE
AIGA TAKEHIDE
SAITO AKIHIRO
Application Number:
JP2017181729A
Publication Date:
April 11, 2019
Filing Date:
September 21, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
NIPPON STEEL & SUMIKIN ANTI CORROSION CO LTD
NIPPON STEEL & SUMIKIN ANTI CORROSION CO LTD
International Classes:
B29C63/10; B29C48/15; B29C48/285; B29C48/30; B29C48/92; F16L9/147
Attorney, Agent or Firm:
Intellectual Property Office