In daily life, PE protective film is relatively common in the protective film market, and it is used in many fields, especially in the protection of products during production, processing, transportation, etc., so that the product will not be damaged during use. Contaminated, corroded and scratched. Then in the process of use, sometimes it is found that there are crystal points on the PE protective film.Guangdong Huaping Hygiene Material Industrial Co.,Ltd. main products include PE cast film,PE breathable film,PE perforated film,Multicolor printed film,Nonwoven Laminated film,Anti-counterfeiting Holographic film etc .
Crystal dots are also called fish eyes, which are shaped like small and hard bead dots, which affect the appearance of the film, and will form bumps after compounding with other substrates. Even primary resin raw materials can produce crystal points, which can be caused by overheating in the production process or retention of molten raw materials. During the production process, low-quality raw material particles or high molecular weight (cross-linked) sites will form crystal points. The appearance of crystal points is very similar to that of water bubbles or unmelted resin.
The main reasons for the crystal point of the PE protective film are as follows:
The cleanliness of raw materials, including the cleanliness of the raw materials themselves and the dust pollution of the environment; therefore, attention should be paid to the production process of PE protective film.
In terms of raw material selection, the melt properties of several raw materials are quite different, and crystal points are prone to appear when the compatibility of raw materials is not good; therefore, the selection of raw materials is very important.
In terms of processing conditions, improper processing temperature will cause poor plasticization or over-plasticization of raw materials, which will cause crystal point phenomenon.
The processing capacity of the equipment, equipment barrel screw, filter, etc. also have a very important impact on the generation of crystal points.
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