In the production process of plastic bottles, the heat resistance of the preform is a crucial parameter. With years of experience and professional knowledge, Heyan Mold provides you with a series of key strategies to improve the heat resistance of bottle preforms, ensuring that your plastic bottles are of high quality and meet various application needs.
1, Accurately control the cooling time of bottle preform injection
The primary step in improving the heat resistance of preforms is to precisely control the injection cooling time of preforms. Through precise calculation and optimization, the joint research mold ensures that the preform is demolded within the optimal cooling time. This not only shortens the molding cycle and improves production efficiency, but also induces spherical crystallization through higher residual temperatures, significantly enhancing the heat resistance of the preform.
2, Optimize preform and bottle design
Reasonable preform and bottle design are crucial for improving the heat resistance of bottles. The designers of the joint research mold are well aware of this. By carefully designing and optimizing the shape of the bottle blank and the mold structure, they ensure the uniform distribution of the bottle wall thickness and avoid distortion or shrinkage deformation in different areas of the bottle body. This optimized design not only improves the overall performance of the bottle, but also enhances its heat resistance.
3, Strictly control the injection and casting process
Injection and molding are key processes in the production of plastic bottles. The joint research mold strictly controls the blowing process parameters and temperature distribution in each area, avoiding the deformation of the preform caused by the release of residual stress at the PET glass transition temperature. This precise control ensures the stability and consistency of the preform during stretching and blowing processes, thereby improving the heat resistance of the bottle.
4, Adopting cyclic blowing technology
When using a hot blow bottle mold, controlling the deformation of the bottle after demolding is crucial. The joint research mold adopts advanced circulating blowing technology, which cools and shapes the bottle body by blowing air and emptying the circulation before opening the bottle mold. This technology effectively controls the deformation after demolding, ensuring the shape and size stability of the bottle, thereby improving its heat resistance.
5, Using temperature control technology with blow molding molds
The temperature control technology of blow molding is the key to ensuring stable bottle quality. The joint research mold adopts the hot oil circulation method to heat the blow molding mold, and achieves precise temperature control through three different circulation methods. Among them, the cooling water circulation at the bottom of the bottle ensures that the bottom of the bottle remains at a low temperature of 10 ℃ -30 ℃, avoiding excessive crystallization and whitening of the unstretched bottom of the bottle. This precise temperature control ensures the stability and consistency of the bottle during production, thereby improving its heat resistance.
In summary, the joint research mold has significantly improved the heat resistance of plastic bottle preforms through key strategies such as precise control of bottle preform injection cooling time, optimization of bottle preform and bottle design, strict control of injection and drawing processes, adoption of circulating blowing technology, and application of blowing mold temperature control technology. These strategies not only ensure the high quality and stability of the bottles, but also meet various application needs, making your products more competitive. "
