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Q What are the common problems of protective film sticking to the surface of materials?
A First, the glue transfers.may be bacause the amount of curing agent is not enough, the glue is not completely dried, the corona value is not enough, or the glue is not selected properly. Second, the film is torn off. It is mainly caused by improper selection of glue and too soft of glue. Third, floating film. The viscosity of glue is too small, or it is caused by too much curing agent.
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Q Should the finished protective film be tested?
A First measure the width of the finished film with a tape measure. Compared with the raw film, is the shortening within a reasonable range? If the film is stretched too much, stop the machine to inspect. Second, the finished film should be folded in half quickly to see if there is any phenomenon of filament elongation. If there is, then it is not dried enough, and the oven temperature should be adjusted in time. Thirdly detect peeling strength by tensile force. Fourthly, put coated film into aging box for more than 24 hours to test the water resistance property.
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Q What should I pay attention to in oven temperature setting?
A The oven temperature is set scientifically based on the principle of energy saving. The oven temperature in the first section is about 55 degrees, and the last section is 10 degrees higher than the first section. The intermediate temperature increases in turn according to the film thickness, and the highest temperature does not exceed 100 degrees.
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Q What to prepare before starting the machine?
A Select a suitable mesh roller to wash for later use. Walk around the machine to see if there is anything unusual of the coating machine, whether the power is on, and so on.
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Q What are precautions for mixing glue and adding curing agent?
A Release glue out into a 50kg container, put it on a standard platform scale and record the net weight. Then, add the curing agent according to the designed proportion, accurately weigh it out with an electronic balance, put it into the glue, add the diluent and stir it with a blender for 30 minutes, and let it stand for use.
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Q What are the key points in the selection of substrate film?
A The substrate film is very important, and it cannot contain filler, opening material, and the thickness tolerence in a straight line shall be below 5 microns. The corona value of transparent film should be 40 to 42 dynes, and around 75 dynes for black and white film . Corona value increases with film thickness increases. The tube core need to remain intact.
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