How to solve deformation defects in blow molded products in Suzhou (Part 1)

The deformation of blow molded products in Suzhou refers to their external shape deviating from the shape of the mold cavity, either convex or concave, longitudinal or radial, or local shape deviation. It is one of the common defects in blow molded products and also a comprehensive and difficult problem to deal with. The degree of deformation and excellent performance of blow molded products are important indicators for evaluating product quality. Due to the significant impact of deformation on production costs in blow molded products, they are receiving increasing attention and concern from the industry.

The greater the degree of deformation of blow molded products, the proportional decrease in satisfaction with their appearance and performance, and in severe cases, it can lead to product scrap. The deformation of blow molded products is not only detrimental to product quality, but also to the output and production cost of blow molded products. Therefore, the solution to deformation defects in blow molded products is an important topic for various Suzhou blow molding processing enterprises to explore in terms of technology.

There are many reasons for the deformation of blow molded products, and adjusting the process parameters alone is far from enough to solve it. Through long-term practical work experience and analysis and summary of relevant data, it is found that the thermal and physical properties of plastic materials, as well as the conditions and parameters of blow molding processes, have varying degrees of influence on the deformation of blow molded products. Therefore, comprehensive consideration and reasonable solutions are needed.

The influence of the thermophysical properties of materials on the deformation of Suzhou blow molding processing:

(1) The use of cyanide pigments in blow molded plastic processing formulas can affect the crystallinity of polyethylene and cause deformation of the product;

(2) The original color blow molded products produced from raw materials without adding any pigments are not easily deformed, which can improve the quality and output of the products;

(3) Using plastic with low melting point and good fluidity can improve product quality and yield due to its low shrinkage rate, fast cooling, and resistance to deformation.

The influence of product wall thickness difference and cooling on the deformation of Suzhou blow molding processing:

(1) The structural design of blow molded products directly affects the wall thickness difference and cooling of the products. The large difference in wall thickness leads to a large difference in cooling rate and deformation.

The wall thickness of the transition part of the product structure where there is a sudden change is small, and vice versa, the wall thickness is large. Therefore, the transition part of the blow molded product structure needs to be smooth, avoiding sharp corners and edges. If there is a large difference in wall thickness due to the special structure of the product, cooling should be strengthened at the thick wall and the cooling circuit of the mold should be set according to the cooling requirements;