NEWS
Hezhetong Pipe Industry
17
2023
-
05
Main characteristics of two-step process for producing double-wall corrugated pipes
The grafting and molding processes are separated, so additives that may affect the grafting reaction can be added to the B material.
Main features of the two-step method:
① The grafting and molding processes are separated, so additives that may affect the grafting reaction can be added to the B material.
② There is no hydrolysis polycondensation catalyst in the A material, so the grafted A material can be stored for a long time.
③ Other additives or additives can be added to the mixture of A and B according to needs, such as barrier agents, lubricants, ultraviolet absorbers, colorants, etc.
④ For mass production, it is beneficial to improve production efficiency. The reason is that the grafting reaction requires the material to have a certain residence time in the extruder, which limits the screw speed not to be too high. In the two-step method, a twin-screw extruder can be used for melt grafting, and a single-screw extruder can be used for product molding. In the second step, that is, single-screw extrusion molding, on the premise of ensuring the plasticization quality, the screw speed can be increased as much as possible to obtain a higher output.
⑤ The main disadvantage of the two-step method is that the process flow is long, and the main resin is extruded twice, and the performance is reduced. At the same time, the two-step method will also increase equipment investment, which is uneconomical for small batch production.
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2022-07-28
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