High-molecular-weight polyethylene steel skeleton composite pipe and its manufacturing method and composite equipment

Abstract

The invention discloses a steel framed HMWPE (high molecular weight polyethylene) composite pipe, a manufacturing method thereof and composite equipment. According to the steel framed HMWPE composite pipe, material strength and composite bonding strength are very high; pipe flexibility is good, and the pipe can be bent with topographical change for laying, can be resistant to ground settlement to a certain extent and is not prone to cracking; meanwhile, the toughness is good, pipe joint stress can be greatly reduced, one-way steel wire winding and inner pipe rotation are only required during manufacturing, the diameter of a carbon spring steel wire is 0.5 mm-3 mm, an HMWPE sheet protection layer (4) is arranged on the periphery of a high molecular weight linear low-density polyethylene bonding layer (2), the molecular weight of the HMWPE sheet protection layer (4) is 800,000-950,000 units, the HMWPE sheet protection layer (4) is formed by spirally winding and shrinking HMWPE sheets after thermal stretch processing, edges of adjacent HMWPE sheets after winding are in mutual overlap joint, the overlap joint width is 20 mm-40 mm, the thickness of each HMWPE sheet is 2 mm-5 mm, and the width of each HMWPE sheet is 200 mm-800 mm.

Description

technical field [0001] The invention relates to a polyethylene composite pipe, in particular to a high molecular weight polyethylene steel skeleton composite pipe, a manufacturing method and composite equipment. Background technique [0002] At present, there are many weak links in the ordinary polyethylene steel wire wound composite pipes that are mass-produced and applied in China. For example, the main material of PE100 has limited impact strength, environmental stress cracking resistance, fatigue resistance, and low temperature resistance. The matrix will not crack in any direction of stress, so the wall thickness of the pipe must be increased, and the exterior of the matrix requires double-layer cross-wound steel wires, resulting in higher manufacturing costs for the pipe, and the pipe itself is less flexible and cannot be bent and laid according to terrain changes. Unable to resist ground subsidence, it often causes cracking accidents due to stress concentration at joi...

AI Technical Summary

Problems solved by technology

However, through years of application, it is found that there are several deficiencies in the ultra-high steel skeleton composite pipe that need to be resolved: 1. Although the material of the ultra-high molecular weight polyethylene inner pipe has many excellent properties, as a water supply and drainage pipeline, most of the high-performance The indicators cannot be fully utilized, but the price of raw materials is too high, the screw extrusion speed is too slow, and the production efficiency is low, which restricts the sales promotion of this product

2. The original ultra-high molecular weight polyethylene steel skeleton composite pipe process is to "cold wrap" the steel wire on the inner pipe, and the two are not combined into one. During use, the steel wire often shifts and peels off, which affects the service life

This kind of adhesive material itself has low mechanical strength and bonding strength, and poor heat resistance. It will melt when exposed to the sun, which greatly reduces the ability of the pipe to cope with environmental changes.

4. Although many properties of polyethylene radiation cross-linked heat shrinkable tape exceed PE100 polyethylene, through application, the ability to resist external damage as an outer protective layer is still insufficient, and it is still easy to damage and crack, resulting in water ingress in the steel wire layer of the pipe and corrosion of the steel wire , reduce the service life of the pipe

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