The PVC foam board we know can also be called rigid PVC microcellular foam material, which can be divided into PVC free foam board and PVC skinned foam board according to different manufacturing processes. In fact, it is the difference of extrusion foaming process. Talking about the difference between PVC free foam board and PVC crust foam board

⑴Free foaming: Free foaming is the unrestricted free expansion of the melt as soon as it leaves the die. After a short period of time, it enters a larger size setting device. Free foaming makes all the cells in the cross section of the extrudate formed, and the growth of surface cells is limited to a certain extent by cooling, and finally a continuous density, moderately hard and smooth surface product is formed. The advantage of this method is that the process is simple and suitable for producing products with a thickness of 2 to 6 mm, a simple geometric shape, and a matte surface (such as pipes, sheets and profiles with simple geometric shapes).

⑵Internal foaming method: crust foaming method or Celuka method. A special die with a core is used to divert the plasticized material. The shaping device is connected to the die, and its outer contour is the same as the die. When the material is sent to the setting sleeve before the mold, the melt containing foaming agent enters the cooling setting sleeve as soon as it leaves the mouthpiece, and undergoes rapid cooling on the entire surface, thereby preventing the formation and extrusion of surface cells. Any swelling on the cross section of the object. Thereby, a skin layer is formed by cooling on the surface. At the same time, the core in the die makes the cavity created in the semi-finished product filled with the foam formed by the remaining melt, that is, foamed inside. By controlling the cooling strength, products with a surface layer thickness of 0.1 to 10 mm and a product wall thickness greater than 6 mm can be obtained. The method can produce profiled materials with complex cross-sectional shapes. The product has the characteristics of smooth surface and high hardness, and low density of the core region. In addition, by combining method and method ①, a product with skin on one side and a free state on the other side can be obtained.

Hangzhou Jianguan Plastic Industry co., Ltd . was established in 2013. As a professional     PVC foam board manufacturer     in China, our company specializes in the production of PVC foam board products. It has 6 automatic production lines, and the PVC foam boards developed and produced are smooth and flat. Can be nails, drills, chisels, sticks, etc. Can replace wood. Products are widely used in advertising, carved hollow boards, cabinet sanitary ware boards, furniture, home decoration, decoration, display racks, lighting, architectural decoration, cabinet bathroom cabinets and other industries. Welcome to purchase: https://www.foamboardpvc.com/product/pvc-foam-board/