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1. PE protective film, what conditions should it meet to be considered good?

    What kind of PE protective film is considered good? This question, from a fundamental point of view, refers to the basic requirements and conditions that this kind of protective film should meet in order to be used well. Therefore, the answer is:

    Condition 1: The adhesive of the protective film is appropriate, easy to tear and stick, and there will be no residue.

    Condition 2: After the change in time, the increase in the peeling force is smaller.

    Condition 3: Even if it is exposed to the sun, it can guarantee a service life of six months to one year.

    Condition 4: Even if stored for more than one year, its quality will not change.

    Condition 5: It will not pollute the environment, will not corrode, and will not be prone to chemical changes. In addition, the mechanical properties can also be well maintained.

    2. What material is the core of the PE protective film? In addition, is there a special protective film for PE stainless steel?

    The winding core in the middle of the PE protective film is made of PE, and there are two types of new pipes and pipes made of recycled materials. Therefore, they are not the same in terms of price. In question 2, the answer is yes, that is, in the PE protective film, there is a special protective film for PE stainless steel.

    3. After the PE protective film is glued, white spots appear on the film. What is the reason?

    PE protective film, if white spots appear after the glue is applied, then, the specific reason is the existence of glue particles, or the uneven baking temperature, in addition, it is also possible that there is a problem with the coating head Therefore, it is necessary to investigate one by one to find out the real reason to effectively solve it. Moreover, this problem is a product quality problem and should be paid attention to.

      1. Different batches of inks are added to the particle size inspection target and strictly controlled, especially those where the particle size and particle size of the full-bottom ink type and particle size are scattered outside the standard scale are not selected; choose an excellent and stable supplier.

　　2. Use special adhesive for electronic protective film. The special adhesive for electronic protective film composite has lower surface tension, and its coating and spreading effect on the surface of the glue layer is significantly better than that of general-purpose adhesives. It is very easy to control the leveling of the glue liquid by using glue glue, and it has an ideal coating condition. In terms of adhesive coating conditions alone, the use of electronic glue can eliminate the possibility of white spots.

　　3. There is a certain matching relationship between the viscosity of the glue and the number of lines of the screen roll. If the matching interval is too large, the coating condition of the glue will be damaged, and the occurrence of “white spots” is more important.

　　 4. Choose the electronic protective film gluing method. The commonly used coating technology is the printing film (ink surface) gluing. Here, a special coating method is used to avoid the question of uneven penetration of the ink layer by the ethyl ester and avoid the problem of uneven penetration of the ink layer by the ethyl ester. , At the same time, the coated adhesive can cover the surface of the glue layer sufficiently and evenly, which can eliminate the white spots excellently. But this technology has its big limitations. Firstly, it is only limited to the composite of VMPET, while other electronic protective films will be stretched and deformed under the effect of tension under the influence of heat in the oven; secondly, they will sacrifice certain peel strength. .

　　5. Flexible packaging companies must adhere to the regular cleaning guidelines for the coating roller and master accurate cleaning methods for the coating roller. When producing a full-white or light-background printing film, two points should be paid attention to. First, the doctor blade, coating roller, and flattening roller should be completely cleaned before production.

　　 6. The adhesive should be completely dry. Because the barrier property of aluminum plating is better, if the bonding in the composite film is not completely dry, then after the composite film enters the maturation room, a large amount of residual solvent needs to be released quickly, and under the barrier of the electronic protective film, it is bound to form vapor bubbles . It may even show the phenomenon that there is no white spots when the machine is off, but white spots appear after curing.