Guangdong Huaping Hygiene Material Industrial Co.,Ltd. main products include PE protective film,PE breathable film,PE perforated film,Multicolor printed film,Nonwoven Laminated film,Anti-counterfeiting Holographic film etc .We have introduced the main crystal point types, identification methods, causes and countermeasures in detail above. It can be summed up as follows:
①Use a hot stage polarizing microscope to identify different types of crystal points
Pollutants can be seen under the microscope – crystal points of foreign pollutants; clear crystal points or degradation products can still be seen after heating and melting the main body of the film – highly crosslinked/oxidized crystal points; crystal points after heating and melting the main body of the film Disappeared, but the crystal point can be seen again after cooling down—slightly crosslinked crystal point; the crystal point disappears after the main body of the film is heated and melted, but the crystal point does not recover after cooling—the crystal point with poor plasticization.
②Measures to deal with crystal points of foreign pollutants
Improve the cleanliness of the workshop; improve the material storage and transportation process to keep the resin packaging bags clean; strictly control the production order and avoid cross-contamination between different types of raw materials when batching.
③ Countermeasures for cross-linking/oxidation crystal points
Replacing raw materials with fewer batches of crystal points; lowering the processing temperature; adding additional antioxidants; optimizing equipment, replacing with designed screws, etc.
④ Countermeasures for plasticizing poor crystal points
Avoid mixing pellets and powders; pay attention to the pumping process of raw material particles to avoid raw material powder due to friction; avoid simple blending of raw materials with very different melting points;
If the formula requires that raw materials with large melting point differences must be mixed; the temperature of the first and second areas of the screw needs to be lowered to avoid premature melting of low melting point raw materials, and at the same time, the filter screen can be denser to increase the shear of the metering section.
Our domestic website:gdhuaping.com.cn
Phone:
Contact Now