How to distinguish PVC crust foam board true and false skin?
February 21, 2019
Pvc crust board with its unique performance and beautiful appearance is widely used in major industries, I believe many customers are more interested in how it distinguish between true and false.
True crust is the use of seluca method to form a layer of dense and rigid crust on both sides of the plate, which can increase the hardness and nail holding power of the plate. These physical properties are very important for furniture manufacturing or house decoration.
Celuka, also called controlled foaming, is currently used very widely and was invented by the French company gine kulmann. It is one of the first patented extrusion foam molding methods. The principle of selucafa is that the outer skin of the melt is compressed and cooled in a styling device directly connected to the die mouth, and the core dies in the cavity ensure that the extrudate leaves space when leaving the die mouth. It is filled with free foam in the sizing die by the melt. Cooling strength, core die size, and extrusion speed can affect foam core density and outer skin thickness. Complex shapes produced in this way have low density, high hardness and a smooth surface.
To identify whether a PVC board has (true) crusts, it is actually very simple! Use the thumb nails to press hard on the surface of the PVC board, and then carefully check if there is a deep dent. If there is, it is obviously false and it is better not to use it. In addition, there is a core layer in the middle of the true crust foam board. As shown in the above figure, the PVC crust foam board clearly shows the core layer in the middle of the true crust foam board.
We Novista Group are the professional manufacturer of PVC Additives using for PVC foaming boards. We can supply foaming regulator, acrylic processing aids, and PVC Stabilizers (Ca/Zn Stabilizer and Lead stabilizers).
For more details, pls email to sales06@novistagroup.com; or contact with us by WhatsApp (0086 150 6536 1235)/Skype (neil_novista)
