1. Corona treatment is applied to the PP and PET films used in the tape.

The result of corona or flame treatment is to form a chemical bond on the surface of the material with an oxidation group, thereby increasing the polarity and chemical reactivity of the surface. Corona or flame treatment is usually done by the film supplier, and if you need to handle it yourself, you must pay attention to the power and time of the corona. If the corona is not enough, there will not be enough polar groups; excessive corona will cause damage to the surface of the material and reduce the surface strength of the material, thus reducing the final adhesion. In addition, surface pretreatment is usually time sensitive. Although the surface tension of the film is increased after treatment, this state is a physically unstable state. After a period of time, oily small molecules in the bulk of the material, such as low molecular weight resins or plasticizers, and oily substances in the air, It will migrate to the surface of the membrane, causing the surface tension to decrease again. This phenomenon is present on all corona materials, and is particularly evident on materials with a glass transition temperature below room temperature, such as PP, PE, and the like.

2. On the basis of corona treatment, apply PP, BOPP, PE tape primer, primer, adhesion promoter to improve the bonding performance of pressure sensitive adhesive.

Primer, such as PP, BOPP, PE tape primer for the US Huajinsi Company | Primer | The function of the adhesion promoter is to improve the adhesion between the adhesive and the plastic film. In addition to the material itself, the coating process also plays a considerable role. First of all, to ensure a certain film thickness. Generally, the thicker the undercoat film, the better the effect on stress release. Of course, the higher the cost, and the higher the drying/curing conditions. In addition, the drying process should be determined according to the supplier's own equipment conditions according to the supplier's own equipment. In principle, the primer product should be completely dry, otherwise it will affect its function. Different films have different restrictions on drying temperature. The temperature resistance of PET film is higher than that of PP, and the drying temperature can be increased accordingly to improve work efficiency. In the process of adjusting the process conditions, the supplier's technical service capability is very important and must be able to assist the user to adjust the process conditions to the best.