Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene

A cast iron pipe, polyethylene resin technology, applied in the direction of pipes/pipe joints/fittings, coatings, pipes, etc., can solve problems such as harmful to the human body, unsuitable for water supply pipes, coating coal tar is not a coating method, etc., to achieve adhesion big effect

Inactive Publication Date: 2007-01-31
KOREA WATER PIPE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, coal tar is not an ideal coating method
[0007] Also, since coal tar is an ultimate by-product of crude oil, it is harmful to humans
Also,

Method used

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  • Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene
  • Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene
  • Coating method for cast iron pipe fitting joint and the coated castiron pipe joint by polyethyene

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Embodiment Construction

[0020] Preferred embodiments of the present invention will now be described in detail.

[0021] According to the present invention, there is provided a method for use in L-shaped elbows, T-shaped branch pipes, Y-shaped branch pipes, double Y-shaped branch pipes, unequal single 90°Y-shaped branch pipes (unequal single 90°Y branches), non-toxic (sanitary ) T-shaped branch pipes, unequal non-toxic T-shaped branch pipes, P-type traps, different-diameter joints and similar cast iron pipe joints 11. The method of coating synthetic resin such as polyethylene resin on the inner and outer surfaces of the above-mentioned branch pipes or elbows, etc. Used to connect pipes to form pipelines. The method includes: a pretreatment process (A) for removing dust, abrasives and other impurities attached to the surface of the pipe joint; a heating process (B) for heating the pretreated pipe joint; a coating process (C) , for melting the coating agent and applying the coating agent on the heated ...

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Abstract

Disclosed is a pipe joint for connecting pipes in order to form a pipeline such as a water supply pipeline and a sewerage pipeline, and more particularly to a cast-iron pipe joint in which the inner and outer surfaces thereof are coated with a polyethylene resin. The present invention relates to a cast-iron pipe joint such as L bends, T branches, Y branches, an increaser connecting pipes of different diameters, for connecting pipes in order to form a pipeline. The inner and outer surfaces of the cast-iron pipe joint are coated with a polyethylene resin through a preprocessing process, a heating process, a coating process, and a cooling process. In the coating process, air is blown through a filtering net from the lower side of a coating tank containing polyethylene resin powder, in order to float the polyethylene resin powder. The heated cast-iron pipe joint is introduced into the coating tank, and is rotated so that the polyethylene resin is adhered to the pipe joint. Thereafter, the pipe joint is cooled in cooling water to contract the coating film and gloss the surfaces of the pipe joint.

Description

technical field [0001] The present invention relates to a pipe joint for connecting pipes to form pipes such as water supply pipes and sewage pipes, and more particularly, to a cast iron pipe joint coated with polyethylene resin and synthetic resin coated on the inner and outer surfaces of the cast iron pipe joint Methods. Background technique [0002] Generally, cast iron pipes are used for water supply and sewage. Pipes are connected using various shapes of couplings to form pipes. [0003] In other words, use L-bends where the pipe bends into an L shape, and T- and Y-branches where the pipe is T- and Y-shaped. In addition, reducing joints are used to join pipes of different diameters to form pipes. Forming piping in this manner requires a large number of unions and straight pipes. [0004] Traditional cast iron pipe and fittings are coated with coal tar by immersion in a coal tar bath, or coated with paint (epoxy paint) to prevent rust. [0005] Coal tar is the final...

Claims

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Application Information

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IPC IPC(8): B05D7/14
CPCB05D7/14B05D3/0236B05D1/24B05D1/002F16L9/147F16L58/1045B05D2254/00
Inventor 朴珍万
Owner KOREA WATER PIPE TECH
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