PET silicone protective film, why are bubbles open and warped phenomenon?

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PET protective film is a kind of material with smooth surface and good electric insulation. It doesn’t adhere to other material. Most of the market saw is a protective film adhesive, so the viscosity can often is the use of PET protective film of silicone glue, it is paste glue with high viscosity (KL-2634ABC), medium viscosity (KL-2620ABC), low viscosity (KL-2620ABC) of three kinds of silicone glue, are high temperature adhesive. The viscosity here is also known as the peel rate, and G can be used to indicate his viscosity.

Low viscosity refers to the peeling rate of 1-3g, medium viscosity refers to the peeling rate of 3-5g, high viscosity refers to the peeling rate of 10-100G, and the adhesive has a good flow support before curing. After curing, the exhaust and transparency are also very high. So it is widely used in computer monitors, protective screen, and mobile phone protection towels and other PET silicone protective film.

The question of bubbles is not related to the rate of peeling off. Usually in production operations, some places do not notice, for example:

The ratio of solvent to dilute 1. please A:B:C: solvent =100:100:10:400, solvent can be used here water containing low toluene or ethyl acetate to mix better, this is more conducive to dilute the PET protective film of the silicone glue paste (to prevent brushing due to the uneven mixing and foaming), according to the order to add glue the first B (delay agent) and C (tackifier) mixed evenly, and then adding A material (catalyst) mixing time is 20 minutes.

2. knife roller coating method by scraping or evenly brush on the PET film, PET film clean, prior to use alcohol liquid to clean the PET film, to ensure that no stains protective film, and spraying when touching it, please bring clean gloves to prevent hand perspiration or dirt contact the PET film, resulting in uneven brushing, foaming phenomenon.

3. into the oven or tunnel oven curing, the curing is best to use a gradual approach, the oven temperature is set to 90 C to 160 C to 100 C, barbecue time according to the amount of coating to adjust, when the dry gel thickness in 10 m coating, glue the barbecue time control in 1 minutes. Dry glue thickness in 20 m coating, glue baking time should be controlled within 1 minutes, pay special attention to the baking time should not be too long or too short, the accuracy of baking time is a protective film two warped decision, or bubble reason

How is the transparency of the PE protective film controlled?

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PE protective film about the transparency of products meet the quality, is here to protect the membrane manufacturers Kai membrane to introduce you is how to promote the transparency of PE protective film:

1.PE protective film is a crystalline material which is easy to crystallize. If it is not cooled rapidly, it will decrease the transparency and elongation at break. The cooling effect of blow molding is poor, the crystallinity is high, and the film transparency is low.

2., due to blow up and drawing, the molecular orientation is serious, resulting in low elongation at break, while the casting has good cooling effect, low crystallinity, good transparency and low orientation, so the elongation at break is high and the shrinkage is good.

3. need to add some anti fog agent.

4. on the basis of the above, add transparent nucleating agent.

5.PE protective film material selection, choose low fog, high melting fingers.

How to buy protective films need to pay attention to what?

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Shopping is the main course of the quality, price and customer service service three, there is no exception in the film industry, quality is the key, which requires the buyer must have an understanding of their own use of the products, so as to be an antidote against the disease. Secondly, the price, protective film is mainly used in product packaging, cost savings is to see how to spend the least amount of money to buy the best goods. Finally, customer service service, the use of protective film is quite a long time, manufacturers generally use a month’s order is not a few, so the protective film supplier customer service service is an important factor for buyers to consider.

To prevent some dealers from their own interests, recommend some counterfeit and shoddy goods to consumers.

How to choose when you buy?

In the purchase of protective membrane products, should pay attention to the following

1., we should select high protection, stable quality, good after-sales service of protective film products.

2. check the purchase of the product packaging logo, logo is complete (executive standard, grade, manufacturer name, address, date of production including product packaging) is solid, specification and product compliance, beware of exaggerated and the phenomenon is inconsistent with the facts.

3. to observe the appearance of the protective film quality, including color, transparency, viscosity, and whether there are crystal dots and holes in the protective film.

4. check the protective film function is reliable, flexible and should choose more than two products were examined, in the test, two or more products to choose the corresponding comparison test, to find a meeting point with their own products.

5. after the test, it is necessary to estimate the service life of the protective film. If it is a temporary protective film, see whether the protective film is left with residual glue after it is torn off.