Injection Molding Technology of Plastic Turnover Box

Aceally's plastic turnover box is made of four brand new HDPE materials. HDPE injection molding process should be said to be a very common technology. In addition to the influence of injection temperature, injection pressure and mold temperature, the injection cycle has little effect on the performance of the plastic turnover box. If these conditions are not paid attention to in the processing, the product performance will be poor. The influencing factors of HDPE injection molding process are briefly described as follows:

1. Injection temperature. According to the molecular weight of HDPE, the molding temperature range is determined. When the molecular weight is fixed, the injection temperature is low, and laminar flow will appear, which will increase the directionality of the product, concentrate the stress, and make the product easy to be rough and warped. The injection temperature is high, the melt is in the state of strip flow when filling the mold, the direction of the product is small, the stress is small, and the surface is bright. If the temperature is about - 340 ℃, the impact strength will decrease and the thermal aging will accelerate.

2. Injection pressure. Injection pressure affects the shrinkage and density of the product. The injection pressure of HDPE is 800-1000kg / cm2, which can meet the requirements of forming plastic turnover box and reduce shrinkage deformation and size fluctuation.

3. Mold temperature. The influence of mold temperature on product performance, geometric dimension and production efficiency has become an important part of injection molding process. Mold temperature not only affects the surface brightness and production efficiency of products, but also affects the rigidity, strength and size of products, especially for crystalline plastics. Mold temperature is low, product rigidity is poor, easy to warp. Mould temperature is high, crystallinity of plastic turnover box is high, rigidity is big, dimension is stable, stress is small. Therefore, the mold temperature of HDPE plastic turnover box is better controlled between 50-70 ℃.