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What factors affect the molding of the blow mold
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2019-07-16

(1), the forming stage of the parison. The polymer is transported, melted, mixed and pumped into the forming stage of the parison. At this stage, the main process parameters affecting wall thickness distribution are:

① The molecular weight distribution and average molecular weight of the material;

② The temperature control system and screw speed of the blow molding machine, during which the temperature control system includes hopper temperature, barrel 1 zone, 2 zone, 3 zone, 4 zone temperature, flange temperature, and storage die head zone 1, zone 2, Zone 3 and Zone 4 temperatures.

(2) In the blanking stage of the blow mold, the parison is extruded from the gap between the die lip and the core into the blanking stage. At this time, the two phenomena of parietal expansion and parietal extension affect the parison formation. The main process parameters affecting wall thickness distribution are the die diameter and wall thickness control system of the blow molding machine, during which the control system includes an axial wall thickness control system and a circumferential wall thickness control system to adjust the gap between the mold lip and the core.

(3) In the pre-blowing stage of the embryo, in order to avoid the touch and adhesion of the inside and outside of the embryo and to improve the uniformity of the wall thickness of the product, the embryo must be pre-inflated. In the pre-blowing stage of the embryo, air is sprayed from below the embryo to the embryo to protect the embryo and reduce its vertical extension. At this stage, the main process parameters affecting wall thickness distribution are: pre-blowing pressure and pre-blowing time.

(4) High-pressure blow stage of the parison The high-pressure inflation of the parison makes it close to the mold cavity and completes the plastic molding stage of the product. At this stage, the forming of the product is affected by the high-pressure inflation deformation of the parison, the parison and the mold cavity touch deformation. The main process parameters affecting wall thickness distribution are: shrinkage of the material; blowing pressure and time; mold material, structure, mold exhaust system and mold cooling system, such as cooling channel distribution, cooling water inlet temperature, etc. Although there are many factors that affect the quality of blow molded products, after the production conditions and product requirements are confirmed, adjusting the blow molding process parameters can effectively improve the product quality. Optimized process parameters can improve production power, reduce raw material consumption, and optimize the comprehensive functions of the product.


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