Guiding Opinions on Plastic Profile Extrusion Production Line

RUGAO PACKER MACHINERY CO., LTD is a professional enterprise specializing in the R&D, production, and sales of plastic machinery. The company has advanced technology at home and abroad, focusing on technological improvement and continuous development of new products. The company specializes in production and operation: pipe production line, plastic profile extrusion production line, environmentally friendly recycling granulation line, extruder, crusher, barrel screw, and various plastic auxiliary machines and other products!

Our centralized advantage

The company has a high-quality and efficient marketing and technical production service team to provide customers at home and abroad with practical, professional, and complete technical support and after-sales service. The company always pays attention to new products and technologies in the plastics field. It keeps pace with the times, applies advanced concepts and mature and perfect technologies to new project development, comprehensively considers technological advancement and economic rationality, and strives to create customer value. The right plan, fast production capacity, and professional on-site processing capacity are our goals.

Precautions during profile extrusion

①. With the help of negative vacuum pressure, the material will be tightly adsorbed on the mold wall of the shaping mold, and the cooling water in the vacuum shaping mold will be cooled and solidified. Whether the vacuum degree is controlled correctly will directly affect the quality of the product. If the vacuum is too low, the adsorption force for the parison is insufficient, the product is difficult to reach the predetermined shape, and the appearance quality and dimensional accuracy are inadequate; if the vacuum is too high, the resistance will increase, it will cause the accumulation of materials at the entrance of the vacuum shaping mold, or even in severe cases. Pull off the profile. Ideally, the cooling water temperature is between 18°C and 22°C during the extrusion process, and the adequate water pressure should be greater than 0.2MPa.
②. The increase in injection pressure can increase the shear stress and shear speed of the melt, which helps accelerate the polymer's orientation effect. Therefore, the growth of the injection pressure and the holding pressure will strengthen the crystallization and orientation effect, and the density of the product will increase rapidly with the increase of the holding pressure.
③. The closing time will affect the orientation effect. If the thermal motion of the macromolecules is still strong after the melt flow stops, the oriented unit will relax again, resulting in a de-orientation product. The use of large gates has a slower cooling, longer sealing time, and longer melt flow time, thereby enhancing the orientation effect, especially the orientation at the entrance is more obvious, so the direct gate is easier to maintain the orientation effect than the point gate.

Automatic thread unloading injection mold For plastic parts with threads, when automatic demolding is required, a rotatable thread core or ring can be set on the mold, and the mold opening action or the rotation mechanism of the injection molding machine can be used, or a special The transmission device drives the threaded core or threaded ring to rotate, thereby pulling out the plastic part. Runners injection mold refers to the method of adiabatic heating of the runner to keep the plastic between the nozzle and the cavity of the injection molding machine in a molten state so that there is no condensate in the pouring system when the mold is opened, and the plastic part is taken out. The former is called adiabatic runner injection mold, and the latter is called hot runner injection mold.

If there is a thin layer of milky white substance on the surface of the plastic part, the injection speed can be appropriately reduced. If the dispersing performance of the filler is too poor and the surface gloss is poor, you should switch to a resin with better flowability or a screw with a stronger mixing ability. Molding raw materials that do not meet the requirements for use will also lead to the poor surface gloss of the plastic parts.

The reasons and treatment methods are as follows: the moisture or other volatile content in the molding raw material is too high, and the volatile components condense between the cavity wall of the mold and the melt during molding, resulting in the poor surface gloss of the plastic part. The raw materials should be pre-dried. Raw materials or colorants decompose and change color and cause poor gloss, and materials and colorants with higher temperature resistance should be used.