Check patentability & draft patents in minutes with Patsnap Eureka AI!

HDPE pipes and fittings

A high-density polyethylene and low-density polyethylene technology, which is applied in the direction of pipes/pipe joints/fittings, pipe connection arrangements, pipes, etc., can solve the problems of high-density polyethylene deterioration and other issues

Active Publication Date: 2022-02-08
HITACHI-GE NUCLEAR ENERGY LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the oxygen generated inside the pipe due to the radiation decomposition of water degrades HDPE mainly from the inside of the pipe

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • HDPE pipes and fittings
  • HDPE pipes and fittings
  • HDPE pipes and fittings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0170] Hereinafter, although an Example is shown and this invention is demonstrated concretely, the technical scope of this invention is not limited to this.

[0171] Test pieces of high-density polyethylene pipes were prepared by varying the addition amount of naphthene-containing oil and aromatic hydrocarbon-containing oil, and the layer configuration of the gas barrier film, and the tensile elongation at break after radiation exposure treatment was evaluated.

[0172] As the conduit, high-density polyethylene produced using a Ziegler catalyst was used. In the base material of high-density polyethylene, as an additive, mix naphthenic oil or oil containing aromatic hydrocarbons, use a Banbury mixer, knead at 180°C for 10 minutes, and granulate high-density polyethylene pipes. particles. Then, the pellets were charged into an injection molding machine to mold a cylindrical catheter.

[0173] Next, using a winding machine, the gas barrier film is wound only on the outer perip...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
melting pointaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The present invention provides a high-density polyethylene pipe and joint capable of suppressing deterioration due to external factors such as radiation, oxygen, and ultraviolet rays, and chemical cracks caused by chemical substances. The high-density polyethylene pipe (10) and joint of the present invention have: a conduit (1) that will have a density of 0.940 g / cm 3 Above 0.980g / cm 3 The following high-density polyethylene is used as the main component; the inner gas barrier film (2a), which covers the inner surface of the catheter (1), and contains ethylene-vinyl alcohol copolymer resin; the outer gas barrier film (2b), which covers the catheter (1) ) containing ethylene-vinyl alcohol copolymer resin; a heat-resistant adhesive film (3b) that covers the outer surface of the outer gas barrier film (2b) and is formed of a resin with a melting point of 150° C. or higher; and the outer layer (4b ), which covers the outer surface of the heat-resistant adhesive film (3b) and will have a density of 0.910 g / cm 3 Above 0.930g / cm 3 The following low-density polyethylene is used as the main component.

Description

technical field [0001] The present invention relates to high-density polyethylene pipes and joints used for nuclear energy equipment and the like. Background technique [0002] Pipelines for nuclear energy facilities installed in nuclear energy-related facilities are required to perform long-term safe transport of fluids containing radioactive substances and fluid transport under high radiation doses. Conventionally, steel pipes have been used as piping for nuclear energy facilities. However, steel pipes cannot be said to be optimal for nuclear energy-related facilities where space constraints and time constraints are foreseeable, since many man-hours, machines, and materials are required for construction. Under such circumstances, replacement with resin pipes that are easy to move and process, and to join pipes and join joints is also being promoted. [0003] As resin pipes, the use of high-density polyethylene pipes, which are also used as long-distance pipes for water s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B32B1/08B32B27/08B32B27/32B32B27/30B32B27/36B32B27/28B32B27/34F16L9/12F16L57/00F16L57/02
CPCB32B1/08B32B27/08B32B27/32B32B27/306B32B27/36B32B27/281B32B27/34F16L9/12F16L57/00F16L57/02B32B2597/00B32B2307/71B32B2307/714Y02E30/00F16L9/123F16L58/10F16L47/00G21D1/00B32B2307/7242B32B2323/046B32B2323/043
Inventor 本棒享子永田纯也寺尾圭论
Owner HITACHI-GE NUCLEAR ENERGY LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com