TPE.TPR materials and products are easy to fall off due to poor adhesion of spray printing ink.
Source：德创化工Time：2020-06-08Hits：2647
Some doll toys, electronic equipment, wire cables and other products made of TPE and TPR materials are often processed by spraying ink or paint on the surface. However, many users have reported that TPE|TPR products are not easy to spray or print ink, which can easily fall off. In this paper, the author briefly points out the following reasons and solutions:
1. The problem of poor ink adhesion
1.1 Cause Analysis:
The polarity difference between TPE|TPR material and ink is large, and the ink is difficult to be compatible with TPE|TPR material. The ink only adheres to the surface of TPE products and cannot penetrate into the interior of TPE materials. In this way, the adhesion force is naturally insufficient and easy to fall off.
1.2 Countermeasures
The big principle is the matching between ink and TPE|TPR material. On the premise of ensuring the basic performance requirements of the product, the easy adhesion of the ink should be considered. The compounding system of TPE|TPR materials should be understood before providing specific ink. Generally PS plastic has certain polarity and is easy to spray printing ink. PP plastic is a non-polar material with high crystallinity and strong solvent corrosion resistance. It is difficult to directly spray printing ink and coating on the surface, which usually requires surface pretreatment.
2. The paint ink is stretched and cracked or falls off
Some TPE|TPR products can be sprayed with ink and paint and have good adhesion. However, if the products are stretched, the paint on the surface will easily fall off or crack.
2.1 Cause Analysis:
The ink or paint layer cannot be stretched with the elastomer TPE product at the same amplitude. When it exceeds its tolerance limit, the ink layer will crack or even fall off.
2.2 Countermeasures
The adhesive component fraction of ink or paint is increased to improve the surface tensile resistance of the ink spraying layer.
The author's point of view: TPE|TPR is a blending modified material, and the component characteristics of its blending system are very important for the selection of ink. Sometimes, in order to achieve good ink printing and spraying effect, TPE,TPR raw material manufacturers and ink suppliers need to cooperate closely to solve the problem of poor adhesion of oil spraying faced by common customers, so as to achieve the triple win effect.
Regarding the problem of TPE.TPR ink spraying, we have encountered hundreds of cases of oil spraying customers and accumulated rich industry experience. If you encounter the problem of poor adhesion of TPE|TPR product spray ink, you can consult us.
