Color difference is a common defect in TPE injection molding, and it is not uncommon to see batches of injection molded products scrapped due to the color difference of matching parts. Not considering the subjective factor of different people's visual perception of color differences, there are many objective factors affecting the color difference of TPE|TPR products, including TPE raw materials, color masterbatch (or color powder), mixing of color masterbatch with TPE raw materials, injection molding process, injection molding machine, mold, etc.. Because of the wide range of factors involved, the color difference control is one of the more difficult techniques to master in TPE color matching injection molding. In the actual production process, we generally control the color difference of TPE products from the following six aspects.

　　Hardness is a very important physical property parameter for TPEs and TPRs. Different test methods and conditions may lead to certain deviations in test results! In this article, Shibu analyzes some of the causes of TPE/TPR hardness deviation.

　　TPR, usually refers to styrenic thermoplastic elastomer SBS, SEBS and other resins and additives mixed into a dry molecular alloy of elastomers (TPES). As the most commonly used TPE refers to styrene elastomer alloy TPES, and the TPE in China generally refers to TPES elastomer, therefore, the TPE/TPR in this paper is based on SEBS, SBS base material modified materials. 　

　　It is said that TPE or TPR products will crack, so what exactly makes TPE (TPR) products crack? Analyze when what happens when TPE products will crack.

　　1. Basic structure of TPE/TPR paints. 　　The main components of TPE/TPR paints in the local market are: 1) Resin 2) Solvent 3) Toner 4) Additive. Among them, resin is the main component of the paint, its function is to make the pigment bonded to the surface of the plastic parts. Generally speaking, the resin of the sprayed plastic parts and the oil should be roughly the same in chemical class, so as to ensure that the plastic parts and the paint can be well sprayed without causing the paint or ink to fall off. This is actually a matching problem between the rubber and the paint.

　　1. TPE/TPR products sticky problem characterization. 　　TPE/TPR material processed products with hands to touch the surface sticky or even some sticky feeling. 　　2. Analysis of the causes of sticky products. 　

　　Bicycle and motorcycle handles, usually using a soft rubber material handlebar cover, this soft material handlebar cover has a soft feel, non-slip effect. This kind of soft material, the most common is soft PVC and rubber.

　　1、Solvent reason 　　For general hard body general-purpose materials such as ABS and HIPS, the paint will usually be combined with a weaker chemical properties of the solvent. In order to ensure that the rubber parts in the spray oil can still maintain a smooth surface and not damage the physical strength.

　　TPE/TPR is a thermoplastic elastomer, which is also called soft plastic because of its low hardness, easy to adjust by providing different blends, and has the thermoplasticity of plastic. Soft plastic TPE/TPR hardness range in ShoreA0~100, the material has a soft and comfortable touch, anti-slip and wear resistance, shock absorption and cushioning, good elasticity with sealing and other unique properties.