Color uniformity in PVC pipe production

In PVC pipe production, color uniformity not only affects the appearance of the product, but is also directly related to market competitiveness. How to ensure color uniformity during production? This article will provide a series of practical tips and suggestions from raw material selection to production process optimization to help manufacturers improve product quality.

Raw material selection

Colorant quality: Selecting high-quality colorants is the basis for ensuring color uniformity. Low-quality colorants may cause uneven color or discoloration during processing. It is recommended to select colorants from certified suppliers and ensure that they have stable quality and consistent formula. We focuses on the research and development of special plastic products and is committed to providing high-quality, high-performance PVC granular solutions to global customers with reliable and guaranteed product quality.

Colorant processing: Premixing powdered colorants can improve color uniformity. Before adding the colorant to the PVC resin, fully premix it in the mixer to ensure that the colorant is evenly distributed. For liquid colorants, ensure that it is fully stirred during the addition process.

Precise ratio: Use high-precision weighing equipment to ensure the accurate ratio of colorant and PVC resin. Too much or too little colorant will lead to uneven color. The recommended colorant ratio is usually between 0.5% and 5%. The workshop staff of We records each ratio and uses an automatic batching system to reduce human errors and ensure the accuracy of the ratio.

Process optimization

Mixing process: Optimizing the mixing process is a key step. Use efficient mixing equipment to ensure that the colorant and PVC resin are fully and evenly mixed. Adjust the mixing time according to the characteristics of the colorant and resin to avoid insufficient or too long mixing time, resulting in uneven color.

Control processing conditions: Keep the temperature and pressure of the injection molding machine stable to avoid uneven color. Too high or too low temperature may cause the colorant to degrade or stratify, which will affect the color of the final product. Check and adjust the temperature settings regularly to ensure the consistency of processing conditions. Generally speaking, the injection molding temperature of PVC is usually between 160°C and 210°C. The specific temperature will be adjusted according to the material formula and requirements. The injection molding pressure is generally between 500 and 1500Mpa, but it will also vary according to the specific mold and product complexity. Equipment maintenance: Regularly clean and maintain the injection molding equipment to avoid residual substances affecting color uniformity. Equipment calibration is also very important. Ensuring that the equipment is running at its best can reduce problems in production.