Product description

Foaming regulator is a regulator that increases the pressure and torque of the PVC melt, thereby effectively increasing the cohesion and homogeneity of the PVC melt, and making the resulting PVC products more dense.

Foaming mechanism

In PVC foam products, the purpose of adding ultra-high molecular weight polymers: one is to promote the plasticization of PVC; the other is to improve the melt strength of the PVC foam material, prevent the merger of bubbles, and obtain a uniformly foamed product The third is to ensure that the melt has good fluidity to obtain products with good appearance. Due to the different products of different foaming product manufacturers, the equipment, processes, raw materials and lubrication systems used are different, we have developed foaming regulators with different properties to meet the different needs of users.

1. Definition of foam material

Foamed plastic is also called foamed plastic. It is a composite material filled with gas, which is based on plastic and contains a lot of bubbles.

2. Classification of foamed sheets

According to the different expansion ratios, it can be divided into high foaming and low foaming. According to the softness and hardness of the foam texture, it can be 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 common PVC foam sheet is a rigid closed cell low foam sheet.

3. Application of PVC foam sheet

PVC foamed sheet has the advantages of chemical resistance, weather resistance, flame retardancy, etc., and is widely used in many aspects, including display panels, signs, billboards, partitions, construction boards, furniture boards, etc.

4. The key factors to evaluate the quality of foamed sheet

For foamed materials, the size and uniformity of the cells are the key factors affecting 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. From the perspective of reducing the density of the foamed sheet, only the cells are small and uniform can the density be further reduced, and it is difficult to further reduce the density if the bubbles are large and scattered.

5. Key points of PVC foaming process control

Plastic foam molding is divided into three processes: the formation of the bubble core, the expansion of the bubble core and the solidification of the bubble. For the PVC foamed sheet with chemical foaming agent, the expansion of the bubble core has a decisive influence on the quality of the foamed sheet. PVC is a linear molecule with short molecular chain and low melt strength. During the process of bubble core expansion into bubbles, the melt is not enough to cover the bubbles, and the gas is easy to overflow and merge into large bubbles, which reduces the product quality of the foamed sheet .