How to distinguish true crust and false crust of PVC foam board

True crusting is a process of inserting cards. Forming a dense and hard crusting layer on both sides of the board can improve the hardness and nail holding power of the board, and these physical properties are very important for making furniture or decorating houses. It is actually very simple to identify whether PVC board has (true) crust! As long as the store is not looking, press the PVC board hard with your thumb nail, and then carefully check whether there is a deep dent. If there is, it is obviously fake, and it is best not to use it. Celuka method, also known as controlled foaming method, is widely used at present. It was invented by French company Jeanne cullmann, and it was one of the earliest patented extrusion foaming methods. The principle of Seruka method is that the skin of the melt is compressed and cooled in the solidification device directly connected with the die, while the core die in the die cavity ensures that there are spaces inside the extrudate when it leaves the die, and these spaces are filled by the free foaming of the melt in the solidification die. The cooling intensity, the size of the core die and the extrusion speed will affect the density of the foam core layer and the thickness of the skin. The complex profile produced by this method has the characteristics of low density, high hardness and smooth surface. Baotian Hi-Tech can visit www.potentech.cn. In addition to producing PVC skin foamed boards, they also produce PVC own foamed boards and PVC foamed profiles. The product quality belongs to middle and high grade.