Hollow forming technology, as an efficient and flexible plastic processing technology, has been widely used in multiple industries. With the continuous advancement of technology, hollow forming technology is developing towards efficient automation, green environmental protection, high-performance materials, and multifunctionality, providing various industries with higher quality and environmentally friendly hollow products. In the future, with the continuous emergence of new materials and processes, hollow forming technology will continue to play an important role in the field of plastic processing.
Hollow forming technology can achieve continuous production, high production efficiency, and is suitable for large-scale production. Hollow forming equipment is relatively simple, with low maintenance costs and high utilization of raw materials, reducing production costs. Hollow molding can produce hollow products of various shapes and sizes to meet different application needs. Hollow molded products have good mechanical properties, chemical resistance, and barrier properties, making them suitable for various application scenarios.
What is the general shrinkage rate of hollow formed products in Dalian?
The shrinkage rate of hollow formed products is influenced by various factors, and the shrinkage rate of different materials varies. The following are some common shrinkage rate ranges for hollow formed products made of plastic materials:
Polyethylene (PE): The shrinkage rate of low-density polyethylene (LDPE) is generally between 1.5% and 3.0%; The shrinkage rate of high-density polyethylene (HDPE) is usually between 1.2% and 2.5%.
Polypropylene (PP): The shrinkage rate is relatively high, generally ranging from 1.0% to 2.5%, and sometimes even up to 3.0%. The specific value may vary depending on the use of additives and molding process conditions.
Polyethylene terephthalate (PET): The shrinkage rate of PET is usually between 1.2% and 2.0%. The shrinkage rate of PET products formed by stretch blow molding may be reduced due to the orientation of molecular chains, generally around 0.8% -1.5%.
Polyvinyl chloride (PVC): The shrinkage rate of rigid PVC is relatively small, generally ranging from 0.6% to 1.5%; The shrinkage rate of soft PVC is relatively large, usually ranging from 1.0% to 2.5%.
It should be noted that these shrinkage rate data are only approximate ranges, and the actual shrinkage rate may vary depending on factors such as the specific material model, molding process parameters (such as temperature, pressure, cooling rate, etc.), product shape, and wall thickness. In actual production, it is necessary to accurately determine the shrinkage rate of specific products through experimentation and adjustment, in order to design molds reasonably and optimize molding processes, ensuring the dimensional accuracy and quality of products.
Blow molding is a widely used molding process in the production of plastic products, mainly used to manufacture hollow containers, bottles, cans and other products. This technology involves blow molding molten plastic material, causing it to expand and cool in a mold to solidify, ultimately forming the desired hollow shape. Hollow forming technology has been widely used in various industries such as food, beverage, cosmetics, medicine, and chemical due to its high efficiency, flexibility, and cost-effectiveness.
The quality of the billet directly affects the performance of the final product, so it is necessary to precisely control the wall thickness, length, temperature, etc. of the billet. Modern hollow forming equipment is usually equipped with advanced billet control systems, such as the Parison Programming System, which achieves precise control of the billet by adjusting the parameters of the extruder or injection machine.
