Production method for multilayer composite plastic pipes and production line thereof

Abstract

The invention discloses a production method for multilayer composite plastic pipes and a production line thereof. The production line comprises three-layer inner pipe coextrusion forming equipment, a winding machine, a cladding layer extruder and outer-layer foaming coextrusion forming equipment; and a plurality of devices are connected to form the production line, so at least seven layers of plastic pipes can be formed in one piece. The production method of the invention comprises the following steps of extruding the plastic pipes, adding an anti-oxidation layer, enhancing the winding of compression resistance, foaming an intermediate insulating layer and extruding anti-extruding outer-layer pipes, and the steps are finished continuously on one production line, so the continuous and automatic production is realized, the production efficiency is improved substantially, the labor strength is reduced and a large amount of energy is saved.

Description

technical field [0001] The invention belongs to a plastic pipe production method and production equipment, in particular to a production method and a production line for producing a multilayer composite plastic heating pipe containing an insulating layer. Background technique [0002] The heating water pipelines used in urban central heating mostly use steel pipes. In order to solve the insulation problem of the steel pipes, a layer of insulation material is covered on the outside of the steel pipes. The heating pipelines with this structure have the following defects. 1. Because the main pipeline adopts Steel pipes and main pipes are buried underground for a long time and are easily corroded. Therefore, the service life of this heating pipe is generally about 1 year; 2. Steel is a good conductor of heat. In order to reduce heat loss, the thickness of the insulation material must be increased, and the cost is high. 3. When this heating pipeline is produced, several meters of...

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Problems solved by technology

[0002] The heating water pipelines used in urban central heating mostly use steel pipes. In order to solve the insulation problem of the steel pipes, a layer of insulation material is covered on the outside of the steel pipes. The heating pipelines with this structure have the following defects. 1. Because the main pipeline adopts Steel pipes and main pipes are buried underground for a long time and are easily corroded. Therefore, the service life of this heating pipe is generally about 1 year; 2. Steel is a good conductor of heat. In order to reduce heat loss, the thickness of the insulation material must be increased, and the cost is high. ; 3. This kind of heating pipeline is made into pipeline sections with a length of several meters, and then several pipeline sections are connected during construction, which consumes a lot of manpower and material resources, and the joints are easy to be damaged, which directly affects the service life of the heating water pipeline.

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