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What factors affect the molding of bottle caps
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2018-10-18

What factors affect the molding of bottle caps

(1) In the forming stage, the polymer is transported, melted, kneaded, and pumped into the forming stage in the extruder. At this stage, there are two main process parameters that affect the wall thickness distribution:
① Molecular weight distribution and average molecular weight of the material;
② The temperature control system and screw speed of the blow molding machine, among which the temperature control system includes the temperature of the hopper, the temperature of the zone 1, 2, 3, 4 of the barrel, the temperature of the flange, and the zone 1, 2, Zone 3 and Zone 4 temperatures.
(2) Pre-blowing stage of preform In order to avoid contact and adhesion of the inner surface of the preform and improve the uniformity of the wall thickness of the product, pre-blowing of the preform is required. 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.

(3) 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 moment, the two phenomena of swelling of the embryo and the vertical extension of the embryo affect the shaping of the embryo. The primary process parameter affecting wall thickness distribution is 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 die lip and the core.

(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: shortening rate of data; blowing pressure and time; mold information, structure, mold exhaust system and mold cooling system, such as cooling water 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 determined, 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 product induction functions.