How is the deformation of rotomized products

1. Cause analysis of warping deformation

Although rotoplastic products are non-compression forming, compared with other compression forming methods, it is not easy to warp and deform.

However, rotoplastic products are generally complex in shape, uneven in wall thickness, and not completely symmetrical.

The cooling rate and shrinkage rate between different parts of the product are inconsistent, and the warping deformation occurs in the large plane and the part with the large wall thickness difference.

The shrinkage of PE products after rotomolding is relatively large, generally 2% to 3%, and even as high as 3% to 5%.

The dimensional accuracy is poor, and the shrinkage rate is even higher in parts with large local linear dimensions.

The shrinkage of the product is also related to the heating temperature, cooling setting temperature, cooling rate and product stripping temperature when the product is formed.

These factors are not easy to control accurately in the process of rotomolding.

Especially in the process of product demoulding, many manufacturers in the pursuit of production efficiency, product temperature at 70 ~ 80℃ or even higher when the demoulding.

Then through the post-shaping treatment to control the shape of the product, because the release process of artificial control factors are too strong, so the product contraction is more difficult to control.

For products whose dimensions and deformation requirements are more stringent.

In addition to taking targeted measures in the rotomolding process, the post-shaping process is also more important.

In order to produce higher quality products, emphasizing the stability and uniformity of the production process should be an important concept throughout the entire manufacturing process.