Double-wall corrugated tubing with square external and circular inner

Double-wall corrugated tubing with square external and circular inner

  • CN 202,917,921 U
  • Filed: 11/12/2012
  • Issued: 05/01/2013
  • Est. Priority Date: 11/12/2012
  • Status: Active Grant
First Claim
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1. square-outside and round-inside double-wall corrugated pipe, comprise skin and internal layer, be welded together by hot melt between described skin and the internal layer, it is characterized in that:

  • described skin is the ripple struction layer, internal layer is processed as the planomural structure sheaf, outer field trough place is circular arc and internal layer welding, and outer field crest place is that square, square edge is processed as fillet.

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