Process for extruding plastic foil in pipe

Abstract

The technological process of extruding plastic film inside pipe includes extending plastic film extruding head into pipe and to the other end, extruding plastic film in certain width to the inner wall of the pipe while making the pipe move spirally in the direction of leaving the extruder for the plastic film to be adhered to the inner wall. Compared with available technology, the present invention has the features of high efficiency, easy deairing, high adhering strength, easy altering in the film type and thickness and multifunctional extruding.

Description

technical field [0001] The invention relates to a process method for lining a plastic film inside a pipeline, in particular to a process method for extruding a plastic film inside a pipeline. Background technique [0002] In the prior art, plastic film is usually used to line the inside of the pipe by inserting the extruded tubular plastic film into the pipe, and then using an expanding head slightly larger than the inner diameter of the tubular plastic film to pull from one end of the pipe to the other end while heating The way to line the plastic film to the inner wall of the pipe. In this method, when the diameter of the pipeline is large, the diameter of the expansion head is also large, and the weight of the expansion head is very heavy. It is easy to produce bubbles and wrinkles, which will affect the quality of the lining plastic film; there is also a method of inserting the tubular plastic film into the pipe, blocking both ends of the pipe, and then blowing compress...

AI Technical Summary

Problems solved by technology

In this method, when the diameter of the pipeline is large, the diameter of the expansion head is also large, and the weight of the expansion head is very heavy. It is easy to produce bubbles and wrinkles, which will affect the quality of the lining plastic film; there is also a method of inserting the tubular plastic film into the pipe, blocking both ends of the pipe, and then blowing compressed air into the interior of the tubular plastic film, and heating at the same time to make the plastic The film blows up to the inner wall of the tube. In this way, it is difficult to remove the air between the plastic film tube and the inner wall of the tube. Moreover, when the diameter of the tube becomes larger, a large amount of compressed air is needed to achieve the pressure required to make the plastic film stick to the tube wall, which wastes energy. ,low efficiency

When the above two methods need to adjust the internal plastic film, it is necessary to re-produce a plastic film tube with a suitable thickness, and then carry out the plastic lining operation, and then adjust it again. It is inconvenient to adjust and the cost is high.

Both production methods are in the cooling state of the plastic film or heating from the cooling state, it is difficult to control the film to be firmly bonded to the inner wall of the pipe in the best state, resulting in poor bonding strength

If it is necessary to line the interior of the pipeline with multi-layer functional materials due to the improvement of the internal anti-corrosion level of the pipeline or the realization of a more firmly bonded inner plastic film, the process methods of the prior art need to first extrude the plastic film of multi-layer functional materials. On the one hand It is inconvenient to adjust. On the other hand, when it needs to be heated for bonding with the pipe, it is difficult to control the temperature because the temperature required by each layer of material is different.

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