With the rapid development of TPE material, TPE thermoplastic elastomer demand is also constantly increased. But some businesses familiarize TPE thermoplastic elastomer, and found TPE thermoplastic elastomer will shrink. So why TPE thermoplastic elastomer shrink? It will not shrink little impact on product processing? Here in the plastic Wang professionals come to you to solve these problems, I hope do not understand the business after reading, you can make You know more about TPE material.




 




       1. When starting from a molten state TPE to cool their molecules are aligned with each other, it will make the overall size of the molded workpiece contraction. Although this contraction is generally in the range of a few thousandths of an inch, but enough to be able to significantly affect the workpiece molding and stripping, and finally make a finished appearance. If uneven shrinkage, it will make a flat piece originally bent or deformed. Therefore, in the production of TPE, more stringent requirements on the error, for these reasons, it is in the process of production of TPE will usually shrink resistance into account.




       2. SBS for the substrate of TPE (TPR) material, water resistance are good, generally TPE / TPR material shrinkage of about 1.5 to 3%. The polar polyester or polyether TPU material for the substrate is not water, but water is generally encountered swells rather than shrink, and conditions of use nor is uncertain. Different because of the different physical properties of different formulations so produced by the shrinkage of each TPE manufacturer of shrinkage are not the same.




       3. The molding conditions can significantly affect the degree and nature of contraction. If the state quickly from a high to a low stress stress state, the degree of contraction will increase. Rapid cooling and a high injection speed or pressure of the workpiece, but also can affect contractility.




       4. In the production of TPE, from design considerations to shrink resistance, mold piece must be processed than the desired size slightly larger. Actual shrinkage values only until the specific shape of the workpiece can be learned. Therefore, prior conservative is always the best. Some are more anisotropic than other TPE TPE, that is to say may shrink in one direction than in another direction more. When designing the mold when this factor must be taken into account.




       Finally, we get TPE material shrinkage of: 1.5 to 3%. It is normal. And because in the production process of TPE, shrink considerations which manufacturers will usually TPE materials are included, so it will not cause any impact shrinking product processing, so you can rest assured purchase.