Polypropylene skeleton-enhanced corrugated pipe and manufacturing method thereof

Abstract

The invention discloses a polypropylene skeleton-enhanced corrugated pipe and a manufacturing method thereof. The corrugated pipe is formed by direct spiral winding and clingy fixing of a plurality of hollow tubular products, wherein the hollow tubular products are clung to one another, so that relatively large contact area is formed; the strength of fixed connection can be ensured; meanwhile, the processing and making procedures are reduced; the polypropylene skeleton-enhanced corrugated pipe has relatively good ring stiffness and relatively high strength; the problems existing in a common corrugated pipe are solved; and the polypropylene skeleton-enhanced corrugated pipe is applied to the field of the corrugated pipe.

Description

technical field [0001] The invention relates to the field of corrugated pipe production, in particular to a polypropylene skeleton reinforced corrugated pipe and a manufacturing method thereof. Background technique [0002] The outer corrugated plastic pipe structural wall pipe with hollow reinforcing ribs is widely used in the construction of municipal sewage pipelines because of its good pipe-soil interaction and ring stiffness. At present, there are generally three methods for manufacturing the outer corrugated plastic wound structural wall pipes with hollow reinforcing ribs. [0003] In the first kind, at first the first extruder extrudes the molten strip-shaped plastic sheet, and then makes the sheet continuously and regularly side by side and spirally wound on a circular forming cylinder with many active rotating small rollers. At the same time, another extruder extrudes trapezoidal tubular reinforcing ribs, and after being water-cooled and vacuum shaped, it is presse...

AI Technical Summary

Problems solved by technology

However, this process has the following defects: (1) Since the rib is wound after cooling and shaping, its height cannot be too large, so the moment of inertia of the tube wall after forming is small; (2) The bonding between the rib and the tube wall It is difficult to control. If the temperature of the strip plastic sheet is too low, the bonding will be poor. If the temperature is too high, the strip plastic sheet will fall from the forming roller and it will be difficult to control the molding; (3) After the bonding is completed, strengthen There is always a gap on the side of the rib, which causes stress concentration. When the ambient temperature changes alternately, the welded surface will gradually crack from the gap, which will easily cause the pipe wall and the rib to separate and collapse.

This process has the following disadvantages: the welding position is at the weakest part of the pipe, and the welding surface is small and the amount of melt glue is small, thereby reducing the overall bending strength of the pipe

This process has the following disadvantages: the hollow reinforcing ribs are all formed by plastic special-shaped strips, so that the formed outer corrugated plastic pipe structure wall pipe has a large weight and is not easy to transport

[0006] The above-mentioned ordinary winding bellows generally require multiple winding and rolling processes, which increases the process flow of bellows production, makes its production process more complicated, and also increases the production cost of production machines.

Moreover, such corrugated pipes usually have external threads, which is not conducive to the transportation of corrugated pipes.

Images