Reasons for shrinkage marks in plastic products processing

Plastic products can be seen everywhere in our lives. Plastic products are also produced by factories. Enterprises will have many problems when processing plastic products. The shrinkage of plastic products is one of the common problems in processing. Let’s take a look at the reasons for the shrinkage marks in plastic processing.

There may be one or more reasons for the formation of shrinkage marks in plastic products, including processing methods, component geometries, material selection, and mold design. The geometry and material selection are usually determined by the raw material supplier and are not easily changed. However, there are still many factors on the mold design that may affect the shrinkage of plastic products.

Cooling runner design, gate type, gate size can have multiple effects. For example, small gates such as tubular gates cool much faster than tapered gates. Premature cooling at the gate reduces the fill time in the cavity, which increases the chance of shrink marks. For the molding workers, adjusting the processing conditions is one way to solve the shrinkage problem of plastic products in Dongguan. Filling pressure and time significantly affect shrinkage. After the part is filled, the excess material continues to fill the cavity to compensate for the shrinkage of the material. Too short a filling phase will result in increased shrinkage and eventually more or larger shrinkage marks.