In the production process of PE stretch film, temperature control is a very important factor. Temperature has a greater impact on the production of stretch film. If the temperature is not well controlled, the quality of stretch film is prone to problems. Therefore, attention should be paid to temperature control and autoclave aeration control during the production process.
High-temperature and high-pressure steam curing can remove the free water in the PE stretch film, and the particles of the embryo body can shrink together, which can effectively reduce the rapid evaporation of water, which will cause thermal expansion and damage. So what matters should be paid attention to for temperature control during the production of stretched film?
1. In the production heating stage, pay attention to ensuring that the PE stretch film blank is not affected by steam, and shorten the heating time as much as possible, as long as the steam is continuously and uniformly sent to the curing chamber for 1.0-1.5H.
2. After the heating stage is over, it enters the constant temperature stage, which is an important stage for the body hydration and hydrothermal combination to improve the strength.
With the extension of the constant temperature time, the accumulation of hydrate becomes larger and larger, and the rate of increase in intensity will be faster. But when the constant temperature reaches a certain time, the increase in intensity starts to slow down. With different raw material ratios and different production processes, the produced aerated steel billets have the corresponding optimal constant temperature time.
For example, under the damp and heat condition of 96-100 degrees Celsius, the constant temperature time in spring and autumn is eight hours, the constant temperature time in summer is seven hours, and the constant temperature time in winter is ten hours. In the cooling phase, when the production volume is large, the curing room When the space is not enough, the door of the curing chamber should be opened, and the method of rapid cooling should be adopted to cause the temperature difference stress between the inner surface and the outer surface of the PE stretch film, which will increase the surface tension and easily form micro-cracks. Therefore, the cooling rate must be controlled. The cooling rate does not exceed 10 degrees Celsius every 30 minutes, and the temperature difference between indoor and outdoor does not exceed 30 degrees Celsius.
The above are the two stages that need to be paid attention to in the production of stretch film. If the temperature is controlled well, the quality of the stretch film will be better. Therefore, the temperature must be strictly controlled during the production process. The joypack stretch film manufacturer specializes in producing high-quality stretch film. Stretching film, if you have any questions, please consult us.
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