Forming method of crystalline plastic

Abstract

The invention relates to a forming method of crystalline plastic. The forming method comprises the following steps that a raw material is provided; thermoforming is carried out; cooling crystallization is carried out; cooling and demolding are carried out to form a crystalline plastic finished product, so that the effects of cooling crystallization and cooling demolding can be simultaneously achieved in a mold by utilizing a staged cooling technology, an expensive cooling system is not needed, and a crystallizer does not need to be additionally arranged; and meanwhile, the process yield can be improved, the cost expenditure of required equipment and manpower is reduced, and the total time of the manufacturing process can be greatly shortened.

Description

technical field [0001] The invention belongs to a molding technology of crystalline plastic, specifically refers to a molding method of crystalline plastic that can be molded in one time, so as to reduce the cost of molding equipment and labor, and at the same time speed up molding, and can Further improve the yield rate of its molding. Background technique [0002] Crystalline materials such as containers made of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyphenylene sulfide (PS), among which PET has excellent gas barrier resistance; pressure resistance, creep resistance; impact resistance; transparency, surface gloss; odorless and fragrance retention; and meet the safety of food hygiene, while beautiful, easy to shape, and are widely used in On food containers, such as commonly known as plastic bottles. [0003] PET is a high-molecular polymer, and its most important characteristic is its molecular weight. Molecular weight is the average n...

AI Technical Summary

Problems solved by technology

However, due to the high difficulty in mold design and high construction cost of the ice water system, and the need to build an additional crystallizer, this not only takes up space on the site, but also greatly increases the overall equipment cost, and the continuous heating and cooling is also very difficult. Increase the process time, and may even form defective products, which will cause whitening on the surface of the finished molded body and damage the beauty of the product

[0005] In other words, when the existing crystalline plastics are molded, due to the influence of multiple heating and cooling and demoulding during the process, there are problems such as "high equipment and labor costs", "long process time" and "high defect rate". How to solve the problems faced by the aforementioned injection and crystallization is expected by the industry and is also the technical problem to be solved by the present invention

[0006] The reason is that the inventor of the present invention has made in-depth discussions on the problems faced by the existing crystalline plastics, and through continuous efforts in improvement and trial production to meet the needs of technological development in recent years, he has finally successfully developed a molding method for crystalline plastics. , so as to overcome the shortcomings and inconvenience of the existing high equipment and labor costs and long process time caused by heating and cooling

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