PVC foam board is divided into free foaming and crust foaming. It is widely used in passenger cars, train car roofs, cabinet core layers, interior decoration panels, building exterior wall panels, interior decorative panels, offices, Residential, public building blocks, commercial decorative frames, clean room panels, ceiling panels, screen printing, computer lettering, advertising signs, display panels, signboards, and other industrial and chemical anti-corrosion projects, thermoformed parts, Cold storage panels, special cold preservation projects, environmental protection plate molds, sports equipment, aquaculture materials, beach moisture-proof facilities, water-resistant materials, art materials and various lightweight partitions replace glass ceilings, bathroom cabinets, door panels, etc.

PVC foam board is basically the most difficult one in PVC products, because it is a foamed product, it is easy to have different problems. Due to the mold is heavy, the discharge amount is large, it is not easy to adjust.

Let us first talk about the practical operation rules of PVC crust foam board.

1 Clean mold head and make it on the same level. The opening degree of the die lip is generally adjusted to 1.2-1.5mm, and the opening degree of the middle opening is slightly smaller.

2. Check circuit of the water and air .

3. Turn on the power of the host and set the temperature of each segment:

Reference setting parameters

One to four zones of the barrel are: 170 ° C, 165 ° C, 160 ° C, 150 ° C

Confluent core: 140 ° C -145 ° C

The middle temperature of the machine head is low and the temperature on both sides is high: 165-190 °C

The temperature setting should not be too high and exceed the decomposition temperature of PVC, resulting in a decrease in material properties.

4、Start up, take hungry feeding and corresponding low speed extrusion

Reference: Feeding speed 5r/min

Host speed 5-6r/min

5. After the material flows out from the lip, adjust the feeding and the main engine speed to reach the set value.

Reference: Feeding speed 26-27r/min

Host speed 14-15r/min

6、Wait for the material to fill the mold evenly, and flow out from the die. At the same time, raise the cooling template, the traction roller, place the shaping module, and prepare the traction rope.；

7、After the material is plasticized uniformly, pull material into the cooling template by the traction rope, and the setting table is moved forward to the clamping lip while cooling the material with cooling water or compressed air, until the material flow is uniform, and the foaming condition is observed.；

8、Put down the first cooling template, closely observe the material flow and foaming situation, and then lower the remaining cooling plates, lead the plate to the traction roller, and lower the traction roller.；

9、Go for Normal production, adjust the width of the sheet, adjust the length of the cutting sheet；

10、Measure the thickness and weight of the foamed board, adjust the formulation process according to the actual situation and actual needs until it meets the requirements。

11、Stop. After the production is stopped, the self-configured materials are used for cleaning. Reference formula PVC100, lead salt composite stabilizer 4.0, light calcium 50, external lubricant 2-4, clean the machine, disassemble the mold and clean it, prepare for the next production use, clean the materials of the combined core.