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The TPE Must Consider The Shrinkage In The Process Of Production
Wuxi Qianqiao Strip Steel Co.,Ltd | Updated: Sep 09, 2017

When the TPE cools from the molten state, the molecules are aligned to each other so that the overall size of the molded workpiece shrinks. Although this contraction is usually only within a few inches of the range, it can significantly affect the mold and demoulding of the workpiece, as well as the appearance of finished workpiece. If the contraction is uneven, a workpiece that is supposed to be flat may bend or warp. For these reasons, it is often necessary to consider the shrinkage in the production process:

1. Demoulding of workpiece

When the workpiece contains the core or the hollow part, as the TPE shrinks, it will tightly wrap these parts of the mold, so that the workpiece demoulding becomes very difficult. Die design, mold surface finish and processing conditions can reduce this effect, and even make the automatic demoulding possible.

2. Moulding condition

Molding conditions can significantly affect the degree and nature of shrinkage. The degree of contraction will increase if the high stress state changes rapidly into a low stress state. Rapid cooling of the workpiece and high injection speed or pressure can also affect shrinkage.

3. Design aspects

In view of the shrinkage, the mold must be machined to a slightly larger size than the workpiece needs. Typically, the actual shrinkage value is not known until the concrete workpiece is formed. Therefore, it is always best to be conservative in advance. If possible, use the prototype stencil.

Contact Us
Wuxi Qianqiao Strip Steel Co.,Ltd

Address: No.8 Huicheng Avenue, Xizhang Village, Qianqiao Town, Wuxi City, Jiangsu, China

Tel: +86-510-83233269

Fax: +86-510-83233699

E-mail: maojing@wuxiacp.com

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