Unveiling the Secrets of PP Material in Vacuum Forming

During the Vacuum Forming process of PP material, due to its high crystallization characteristics, it usually has a shrinkage rate of 1.0 - 2.0. This ratio is affected by the size, thickness of the material and the forming time. In the forming process, the longer the time, the lower the shrinkage rate. 

Thermoforming is divided into two methods: vacuum forming and Cup Forming. The shrinkage ratio and forming difficulty of vacuum forming materials vary due to their different compositions. 

The shrinkage rate is influenced by multiple factors, and choosing the right materials and processes is the key to minimizing its impact. For instance, a shrinkage rate of 0.012% means that a 1000-millimeter material will shrink by 12 millimeters, while a 100-millimeter material will shrink by 1.2 millimeters. 

For regular lunch boxes, materials with a shrinkage rate of 1.012 - 1.018 are used, and the shrinkage range is usually between 3 and 5 millimeters. 

Layout has no direct relation to the design of the blister mold; it is only related to the depth and height of the product. When laying out, the shrinkage rate of a single product should be considered first, and then the layout should be made based on the depth of the concave die and the height of the convex die. For example, for a 40-millimeter-high convex die, the spacing should be at least 32 millimeters. 

The selection of materials is crucial to the success of thermoforming. Understanding and mastering this knowledge will help you make wiser decisions during the production process.