Cause analysis of uneven color of injection plastic packaging bottle Dongguan Fucang plastic products
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Analysis on the causes of uneven color of plastic injection bottles

  • Release date: 2021-06-09 09 09:12 reading times: 277
  • Thanks to the advantages of light weight, non fragile, high cost performance and easy processing, etc, Plastic packaging bottle It is widely used in people's production and life. In many production processes, injection molding is a common and widely used one. Sometimes we will find that the color of some injection bottles is uneven. What is the reason for this?

    The main reasons for uneven color of injection plastic packaging bottles include the following aspects:

    1. The diffusion of colorant is poor, which often leads to the appearance of patterns near the gate. It can increase the temperature of the feeding section, especially the temperature at the back end of the feeding section, so that the temperature is close to or slightly higher than the temperature of the melting section, so that the color masterbatch can melt as soon as possible when entering the melting section, promote the uniform mixing with dilution, and increase the chances of liquid mixing.

    2. The thermal stability of plastics or colorants is poor. In order to stabilize the color of products, the production conditions must be strictly fixed, especially the material temperature, material quantity and production cycle.

    3. For crystalline plastics, the cooling rate of each part of the product should be consistent as far as possible. For parts with large wall thickness difference, colorants can be used to cover the color difference. For parts with uniform wall thickness, the material temperature and mold temperature should be fixed.

    4. The shape, gate form and position of the part have an influence on the filling of plastic, which causes color difference in some parts of the part, and it should be modified if necessary. If the gate is too wide, the turbulence effect is poor and the temperature rise is not high when the melt passes through. Therefore, the color belt mold cavity should be narrowed.

    Plastic packaging bottles may encounter various problems in the production process, such as uneven color, sunken, poor gloss, etc. the key is to control the production process, find out the causes of the problems and solutions, so as to ensure the quality of the finished products.


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