Plastic Extrusion Pvc Profile Manufacturers

Material : PVC SG-5 Color :Origin Fire rating:UL 94 V0 Size:40mm*8mm Thickness : 1.3mm Weight :250g/meter Length:1000mm plastic extrusion pvc profile manufacturers often encounter problems such as bubbles, cracks, and pits during the production process, which are often related to the following re……

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Material : PVC SG-5

Color :Origin

Fire rating:UL 94 V0

Size:40mm*8mm

Thickness : 1.3mm

Weight :250g/meter

Length:1000mm

plastic extrusion pvc profile manufacturers often encounter problems such as bubbles, cracks, and pits during the production process, which are often related to the following reasons.

The occurrence of these problems is related to the moisture and volatile substances contained in the material. If there is too much moisture and volatile substances in the material that cannot be completely removed during the extrusion mixing process, these volatile substances will remain inside the material, causing bubbles to form on the surface or inside the profile. When the profile is heated, bubbles will significantly increase, and even cracks and pits will appear. To solve this problem, first of all, it is necessary to handle the moisture and volatile substances in the raw materials, and secondly, it is necessary to establish reasonable process conditions to completely remove volatile substances during high-speed mixing.

PVC is a thermosensitive plastic with poor thermal stability. Although a heat stabilizer is added to the formula, if the heat stabilizer is not good or there are defects in the extrusion process, it can lead to overheating and decomposition. At this point, the generated hydrogen gas often cannot be completely discharged and stays inside the material, forming fine small pores on the cross-section or surface of the profile. plastic extrusion pvc profile manufacturers of such pores is related to the heating system of the extruder’s ability to control the extrusion temperature and uniformity. Excessive extrusion temperature can easily lead to over plasticization and a large amount of gas residue inside the profile, even leading to cracks; If the extrusion temperature is too low, it will lead to incomplete plasticization of the material, and the unplasticized particles will cause pits, burrs, and roughness on the surface of the profile.

Therefore, adjusting the correct process temperature is the key to controlling material plasticization. During the extrusion process, the heat mainly comes from external heating and shear collision heat. In the early stage of startup, the heat mainly comes from external heating; As the startup time increases, the heat of shear conflict continues to increase, sometimes even exceeding the required heat of the material. To avoid thermal decomposition, it is necessary to dissipate heat through the system. Therefore, the plastic extrusion pvc profile manufacturers of the extruder should ensure the stability and high-precision control of the extrusion temperature.

The generation of bubbles is also related to the function of the exhaust system of plastic extrusion pvc profile manufacturers. The function of a twin screw extruder is divided into four areas: feeding area, compression area, exhaust area, and homogenization area. The pressure from the feeding area to the compression area gradually increases, and when it reaches the exhaust area, the pressure drops sharply, while in the homogenization area, the pressure rises rapidly. In the exhaust area, volatile substances vaporize due to a decrease in pressure and easily escape from the melt. They are discharged from the exhaust outlet under vacuum conditions of no less than 0.05MPA.

To solve the problem of cracks in PVC profiles, plastic extrusion pvc profile manufacturers need to pay attention to adjusting the water content of raw materials and the treatment methods for volatile substances, reasonably controlling the extrusion temperature, optimizing the heating and exhaust systems of the extruder, and ensuring the quality and performance of the product.

FAQ:

1.How are your extruded profiles produced and manufactured?

Our extruded profiles are produced through processes such as mold shaping, cooling, traction, and cutting after the plastic particles are heated and melted in the extruder.

2.What are the performance advantages of your extruded profiles?

Our extruded profiles have performance advantages such as high strength, corrosion resistance, insulation, environmental protection, UV resistance, outdoor use, and high fire resistance, which can meet the needs of different fields.

3. Which countries can you export to?

There is no limit on which countries, as long as there are secure, mutual trust, and reliable payment terms, we can export cooperation to all countries around the world.

Contact us to obtain a quotation about plastic extrusion pvc profile manufacturers！