One of the common and important problems in the production process of PVC conduit is the poor smoothness of the inner and outer walls of the pipe. It not only affects the appearance of the pipe, but also causes the problem of wire jamming. So how to effectively solve this problem?

Analysis of the reasons for insufficient smoothness of inner and outer walls

Inaccurate temperature control

The extrusion temperature is a key factor affecting the surface smoothness in the production process of PVC conduit. If the temperature is too high, PVC may melt excessively and flow marks may appear on the surface; Low temperature and poor fluidity result in uneven surface of the pipe, causing ripples or roughness.

Uneven cooling rate

The design and operation of the cooling system directly affect the flatness of the pipe surface. Cooling too quickly can lead to surface cracks and stress, while cooling too slowly can cause surface softening or uneven surface effects.

Mold design and maintenance issues

The surface quality of molds plays a crucial role in the smoothness of pipes. Minor scratches, dirt, or wear on the surface of the mold can be transmitted to the surface of the pipe during production, causing unevenness or roughness. In addition, uneven mold flow channels can affect the flowability of PVC, further reducing surface quality.

Unstable raw materials

The quality of raw materials, especially the particle uniformity, formulation ratio, and moisture content of PVC resin, directly determines the surface quality of pipes. PVC materials with high impurities or improper storage can easily cause irregular textures or roughness on the surface of pipes.

Optimization direction for improving the smoothness of inner and outer walls

1. Accurately control the extrusion temperature setting to ensure uniform surface temperature of the pipe and avoid temperature fluctuations that are too high or too low. By monitoring temperature changes in real-time, we ensure stable production processes.
2. 2. Optimize the cooling system by adjusting the cooling rate based on the wall thickness, material, and production speed of the pipes to ensure rapid and uniform cooling of the pipe surface.
3. Regularly inspect and clean to ensure that there are no scratches or contaminants on the inner surface of the mold. Optimize mold design to ensure even flow channels and avoid surface problems of pipes caused by uneven local pressure.
4. Improve the quality of raw materials and strictly select high-quality PVC resin to control the impurity content in the raw materials, ensuring uniform particle size and moisture control within an appropriate range. Maintain proper drying and storage of raw materials before production to avoid moisture affecting quality.
5. Strengthen quality monitoring during the production process, detect the surface quality of pipes in real time, and quickly provide feedback on any abnormalities that occur during the production process. By using an automated detection system, production parameters can be adjusted in a timely manner to ensure that each batch of products meets the standards.