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What factors affect the forming of preform molds
Edit:Taizhou Huangyan Yige Machinery Co., Ltd.   UpDate:2019-09-24

At present, the use scale of preform molds is relatively extensive, which has the characteristics of high quality, energy saving, high efficiency, long service life, etc., which is more and more favored by manufacturers. So what are the factors that affect preform mold forming? Let's take a closer look.

First, the polymer is transported in the extruder, melted, kneaded, and pumped out to form a parison. At this stage, the factors affecting wall thickness distribution are: 1. 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 the hopper temperature, the temperature of the barrel 1 zone, 2 zone, 3 zone, 4 zone, the flange temperature and the storage die head zone 1, 2 , Zone 3, zone 4 temperature.

Second, the stage of the parison extruding from the gap between the die lip and the die core is called the blanking stage. At this moment, common phenomena are the swelling of the embryo and the vertical extension of the embryo. The factors affecting these two phenomena are: the die diameter and wall thickness control system of the blow molding machine, during which the control system includes the axial wall thickness control system and the circumferential wall thickness control system, which are used to adjust the gap between the mold lip and the core of.

3. Pre-blowing stage of preform In order to prevent the inner surface of the preform from touching and adhering, and to 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 factors affecting wall thickness distribution are: pre-blowing pressure and pre-blowing time.

Fourth, in the stage of high-pressure blow of the parison, the parison is inflated under high pressure to make it close to the mold cavity to achieve plastic molding of the product. At this stage, the common phenomenon is that the embryo is deformed by high pressure inflation, and the embryo and the cavity are deformed by touching. The factors affecting such conditions are: the shrinkage of the material; the pressure and time of blowing; the material and structure of the mold; the mold exhaust system and the mold cooling system, such as cooling water channel distribution, cooling water inlet temperature, etc.

Although there are many factors affecting the quality of blow molding products, after the production conditions and product requirements are determined, adjusting the blow molding process factors can effectively improve the quality of the products. After all, the optimized process factors can increase production power, reduce raw material consumption, and optimize the overall performance of the product.