Protective film glue transfer, there are a variety of factors, I believe that in the work, many teachers will also encounter a similar situation.The phenomenon of the so-called glue transfer is uneven coating or in the process of transportation, the glue shift remains on the surface of the profile, commonly known as glue transfer.

Protective film glue transfer can be divided into the following three situations:

Cohesive damage: there is pressure sensitive adhesive on the surface of profile and substrate, and the coating surface of protective film loses luster;

Adhesive base damage: there are more rubber residue on the profile surface, and the substrate can be seen on the adhesive surface of the protective film;

Migration residue: there is a small amount of glue residue on the profile surface, and the gloss of the coating surface of the protective film is maintained well.

Cause analysis and protective Measures:

Protective film production process, substrate (PET) and raw material (pressure sensitive adhesive) quality problems caused by bad

Solutions

Improving the process and perfecting the scientific process regulation is the guarantee of quality. The technological requirements of coating production include the allocation of glue, the amount of glue, the uniformity of coating, the proportion of curing agent, the uniformity of curing agent dispersed in the glue, the machine speed, the temperature setting, the drying effect and so on.

Improve the quality of glue, such as: use pressure sensitive glue with high gel fraction, improve the degree of cross-linking with the product; The use of long carbon chain acrylate monomer copolymerization or bonding technology; Adding certain UV absorbent to reduce UV aging; Optimize the formula and glue production process to improve the heat and low temperature resistance of pressure sensitive adhesive.

Is to improve the surface tension of aluminized PET film. PET itself is a polar material, both sides have a certain tension, but with the passage of time, the tension value will gradually decay, so the corona processor is used to increase the online electrical activation processing, in order to improve the bonding force of PET substrate and glue.

It is to improve the crosslinking degree of pressure sensitive adhesive. The cohesiveness can be improved by improving the formula of glue and increasing the proportion of crosslinking agent. Aging of protective film

The protective film consists of a plastic substrate and a pressure sensitive adhesive, both of which belong to high polymer. Aging mainly includes thermal aging and ultraviolet aging. After the aging of the protective film, the macromolecular chains forming the substrate and pressure-sensitive adhesive break, the average molecular weight decreases, the cohesion strength decreases, and then the cohesive damage occurs, resulting in glue transfer.

Solution:The protective film and the profiles that have been coated with the protective film should be avoided from sunlight exposure as far as possible, and the protective film should be torn off in time after installation.

Transfer Of Glue

Once the glue transfer phenomenon is found, first find the profile specification and batch number, isolation, it is best to be processed on the profile semi-finished products, production molding into the product, it is very difficult to deal with

Handling Method

First tear off the protective film (different tear film speed, the amount of glue on the surface of the profile will be different, can control the tear film speed), as far as possible to avoid film fracture resulting in increased processing difficulty;

The use of "tar clean" cotton cloth repeatedly wipe, finally wipe clean cotton cloth surface cleaning agent grease, try not to use rough hard fiber cloth, otherwise easy to damage the profile surface gloss;

Re-film after processing.