The plastic injection molding process is an integrated hollow forming technology that combines injection molding and blow molding. It completes production through two consecutive steps: injection molding of prefabricated blanks and blow molding. The core of the process is to melt plastic particles and inject them into a tubular billet, which is then sent to the blow molding station through an indexing system. High pressure air of 0.5-3MPa is introduced to expand the billet and stick it to the mold. After cooling and shaping, the billet is demolded. This process is suitable for materials such as PP, PE, PET, etc., with a single cycle time of 10-30 seconds and a multi chamber equipment production capacity of thousands of pieces per hour. The product has a dimensional accuracy of ± 0.1mm, precise bottle mouth threads, no burrs, and excellent sealing performance, with a material utilization rate of over 95%. Widely used in high-end fields such as pharmaceutical bottles, food packaging, and cosmetic containers, it can produce 5ml-20L bottle and jar products. We are developing towards high efficiency, greenness, and precision through intelligent detection, application of recycled materials, and lightweight design.

The temperature tolerance of plastic products refers to the temperature range within which their performance remains stable under certain conditions, which is divided into continuous use temperature and short-term use temperature. It is primarily influenced by molecular structure, crystallinity, and modification technology. Plastics with rigid groups (such as benzene rings) in their molecular chains or high crystallinity exhibit superior heat resistance. Among common plastics, general-purpose plastics such as PE and PP can withstand continuous temperatures ranging from 50-100℃; engineering plastics such as PC and PA can withstand temperatures up to 100-150℃; and special plastics such as PEEK and PPS can withstand high temperatures above 200℃. In terms of low-temperature performance, PE can withstand temperatures as low as -70℃, while PS tends to become brittle. Application scenarios to be matched: PP (microwave-resistant) for food packaging, reinforced PA for automotive engine parts, and LCP for electronic welding parts. The tolerance can be improved through reinforcement modification and crystallization regulation, and tested by methods such as heat distortion temperature and aging tests.

Injection molding process is the core molding technology of thermoplastic, which produces various products through the cycle of "melting flow molding solidification". The core equipment is the injection molding machine, which consists of injection, mold closing, hydraulic and electrical control systems, and is used in conjunction with precision molds to achieve automated production. The process flow includes raw material pretreatment (drying, mixing), injection molding (plasticization, injection, pressure holding, cooling, demolding), and post-treatment. Key parameters need to be precisely controlled: barrel temperature of 150-350 ℃, injection pressure of 50-150MPa, and cooling time accounting for 50% -70% of the molding cycle. Widely used in packaging, automotive, home appliances, medical and other fields, it can produce a variety of products ranging from precision parts to large structural components. Developing towards positive intelligence (AI parameter regulation), greening (application of recycled materials), and precision (micro injection molding) to enhance efficiency and environmental friendliness.