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What are the factors that affect the molding of the preform mold?

  • Categories:News
  • Time of issue:2021-05-21 11:47
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(Summary description)The application range of preform molds is relatively wide. It has the characteristics of high quality, energy saving, high efficiency and long service life, which are favored by more and more manufacturers. Then, what are the factors that affect the molding of preform molds? Let's get to know it later.

What are the factors that affect the molding of the preform mold?

(Summary description)The application range of preform molds is relatively wide. It has the characteristics of high quality, energy saving, high efficiency and long service life, which are favored by more and more manufacturers. Then, what are the factors that affect the molding of preform molds? Let's get to know it later.

  • Categories:News
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  • Time of issue:2021-05-21 11:47
  • Views:
Information

The application range of preform molds is relatively wide. It has the characteristics of high quality, energy saving, high efficiency and long service life, which are favored by more and more manufacturers. Then, what are the factors that affect the molding of preform molds? Let's get to know it later.

1. The conveying, melting, mixing, and pumping of the polymer in the extruder is the formation stage of the parison; at this stage, the factors that affect the 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, where the temperature control system includes the temperature of the hopper, the temperature of the barrel 1, 2, 3, 4, flange temperature and the storage die 1, Temperature in zone 2, zone 3 and zone 4.

2. The stage where the preform is extruded from the gap between the die lip and the die core is called the blanking stage. At this time, the common phenomenon is the expansion of the parison from the mold and the stretch of the parison. The factors that affect these two phenomena are: the die diameter and wall thickness control system of the blow molding machine. 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 die lip and the core. of.

3. In the pre-blowing stage of the parison, in order to avoid the contact and adhesion of the inner surface of the parison, and to improve the uniformity of the wall thickness of the product, the parison should be pre-bloated. In the pre-blowing stage of the parison, blow air from below the parison into the parison to protect the parison and reduce its sag. At this stage, the factors that affect the wall thickness distribution are: pre-blowing pressure and pre-blowing time.

4. In the high-pressure blowing stage of the preform, the preform is inflated under high pressure to make it close to the mold cavity to realize the plastic molding of the product. At this stage, the common phenomenon is that the parison is deformed by high pressure inflation, and the parison deforms in contact with the mold cavity. The factors that affect this type of situation are: shrinkage of the material; blowing pressure and time; mold material and structure; mold exhaust system and mold cooling system, such as cooling water distribution, cooling water inlet temperature and so on.

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