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[What is the solution when crystal spots appear on the protective film?]
Release date:[2020/7/22] Is reading[45]次

What is the solution when crystal spots appear on the protective film?


What is crystal point? What is the problem of crystal dots on the protective film? Crystal dots, also called fish eyes, are shaped like small and hard bead dots, which affect the appearance of the film and will form bumps after compounding with other substrates. The crystal points of the protective film may be caused by a problem with the material of the protective film itself, or a problem with the equipment during the processing, which requires specific analysis.


So when the protective film has crystal points, what solution can we have?


Solutions to different crystal points of protective film


The hot stage polarized light microscope is used to identify different types of crystal points, and the contaminants-foreign contaminants crystal points can be seen under the microscope.


When crystal spots of foreign contaminants appear, it is necessary to improve the cleanliness of the protective film production workshop; improve the material storage and transportation process, keep the resin packaging bag clean; strictly control the production order, and avoid cross-contamination between different types of raw materials when mixing.


After heating and melting the film body, clear crystal points or degradation products-highly cross-linked/oxidized crystal points can still be seen;


The crystal points disappear after the main body of the film is heated and melted, but the crystal points can be seen again after cooling down-lightly cross-linked crystal points;


When highly cross-linked/oxidized crystal points occur, it is necessary to replace batches of raw materials with fewer crystal points; reduce processing temperature; add additional antioxidants; optimize equipment and replace with high-quality screws.


The crystal point disappears after heating and melting the main body of the film, but the crystal point does not recover when the temperature is lowered—the crystal point with poor plasticization.


When a poorly plasticized crystal point occurs, it is necessary to avoid mixing pellets and powder; pay attention to the pumping process of the raw material particles to avoid the generation of raw material powder due to friction; avoid simply blending raw materials with very large melting points; if the formula is It is required that raw materials with large melting points must be mixed; the temperature in the diyi zone and the second zone of the screw needs to be lowered to avoid premature melting of low-melting raw materials, and the filter screen can be encrypted to increase the shear in the metering section.


The above is the solution when different kinds of crystal dots appear in the protective film. I hope it can help everyone.


Wuxi Rongfa Packaging Material Co., Ltd. is an enterprise that has devoted itself to researching the production and manufacturing of protective film for many years. It has always implemented scientific management and strictly controlled quality. The main products are protective film, self-adhesive film, PE base film, etc. We sincerely welcome customers to visit and guide us.


If you want to know more product information, please contact: Mr. Xu 13301513385 Website: /


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