According to the different foaming ratios, PVC foamed profiles can be developed into high foaming and low foaming. According to the softness and hardness of the foam texture, it can be mainly divided into rigid, semi-rigid, and flexible foams. According to the cell structure, it can be divided into closed-cell foam and open-cell foam. The more common PVC foam sheet is a kind of rigid closed-cell low foam sheet.
PVC Foam Profile has the advantages of chemical corrosion resistance, weather resistance, flame retardancy, etc., and is widely used in many aspects, including display space panels, signs, billboards, partitions, construction panels, furniture panels, etc. For foamed materials, the size of the cells and the degree of uniform change are the key technical factors that affect the quality of the sheet. For low magnification foamed sheet, the cells are small and uniform, the foamed sheet has good toughness, high strength and good surface quality.
PVC foam profile
PVC foam profile is a kind of linear structure molecule with short molecular chain and low melt strength. The melt is not enough to cover the bubbles, and the gas overflow effect merges into large bubbles, which reduces the product quality of the foamed sheet.
Improving the strength of pvc foamed sheet is the key to improving its quality. There are many ways to improve the strength of PVC foam profiles. PVC foam profile is an amorphous material, the melt strength decreases with the increase of melt temperature, and the melt strength increases with the increase of the amount of foaming agent. Generally speaking, as long as the screw has sufficient dispersing and mixing capabilities, the addition of high-viscosity foaming adjustment has a more obvious effect on improving the melt strength.