A manufacturing process of polyethylene steel belt corrugated pipe

Abstract

The invention discloses a manufacturing process of a polyethylene steel belt corrugated pipe. The process comprises the following operating steps of: punching holes in a steel belt, wherein the punching density is from 3 to 6 per cm<2> and each hole is from 3 to 6mm in diameter; cleaning the steel belt, wherein adopted cleaning liquid is a mixing liquid containing the following materials with different moduli by mass percent: 5% to 20% of sodium silicate, 30% to 40% of oxidic polyethylene, 2% to 5% of cyclohexane and 5% to 15% of high-pressure polyethylene with low density; extruding pipe rings from an inner wall and an outer wall, wherein the pipe rings of the inner wall and the outer wall are made of the same polyethylene resin; and tightly bonding the pipe rings of the inner wall and the outer wall with the steel belt by using a vacuum pump and pressing together, thereby crosslinking the inner wall and the outer wall together through the holes in the steel belt. By punching the holes in the steel belt, the polyethylene resins of the inner wall and the outer wall are mutually dissolved, crosslinked and combined together, so that the impact strength and the peeling strength of the polyethylene steel belt corrugated pipe are improved; and thus the material-forming yield is improved. The cleaning liquid is used for removing impurities, eliminating the stress of the steel belt and providing a good interface between the steel belt and organic resin, so that the inner wall and the outer wall are prevented from being not smooth and out of flatness. The inner wall and the outer wall are made of the same material, thereby being consistent in shrinking percentage. As a result, the problems of deformation, bulking and the like are avoided. According to the manufacturing process, the raw material is saved, and therefore the production cost is greatly reduced.

Description

technical field [0001] The invention relates to a double-wall corrugated pipe, especially a corrugated pipe whose inner and outer walls are made of the same polyethylene material. Background technique [0002] At present, most of the double-wall corrugated pipes use recycled polyethylene and high-density polyethylene (HDPE) as raw materials for the inner and outer walls, respectively, and a steel strip is placed between the inner and outer walls. It is necessary to coat the steel strip with an adhesive during production. In order to bond the steel strip to the inner and outer walls. Due to the difference in the raw materials of the inner and outer walls, the shrinkage rate of the material is inconsistent, which may easily cause problems such as large deformation and swelling of the product. In addition, due to the instability of the adhesive, the peel strength of the finished product is low, which affects the yield. In the past, the raw materials of the inner and outer wal...

AI Technical Summary

Problems solved by technology

Due to the difference in the raw materials of the inner and outer walls, the shrinkage rate of the material is inconsistent, which may easily cause problems such as large deformation and swelling of the product

In addition, due to the instability of the adhesive, the peel strength of the finished product is low, which affects the yield

In the past, the raw materials of the inner and outer walls still contained impurities or were not completely dry and contained excess water, which easily produced small bubbles, lack of material on the inner wall, unevenness, holes in the outer wall and steel belt leakage, and rough inner and outer walls.