Common problems of PET masterbatch-part 1

March 24, 2022

1. Under sunlight, there are stripes of paint in the product

This problem needs to be considered from two aspects: the physical and mechanical properties of the plastic and the plastic molding process:

Influence of plastic physical and mechanical properties:

1) The temperature of the injection molding equipment is not well controlled, and the color masterbatch cannot be fully mixed with the resin after entering the mixing chamber.

2) The Injection Molding Machine does not add a certain amount of back pressure, and the mixing effect of the screw is not good.

3) The dispersion of the color masterbatch is not good or the resin plasticization is not good.

The process can be debugged as follows:

1) Slightly increase the temperature of the part of the mixing cavity near the discharge port

2) Apply a certain amount of back pressure to the injection molding machine.

If it is still not good after the above debugging, it may be a problem of the dispersion or matching of the color masterbatch and resin, and the masterbatch manufacturer should be contacted to solve it.

2. After using a certain color masterbatch, the product appears to be easier to break

This may be due to poor diffusion and mutual solubility caused by the poor quality of the dispersant or auxiliary selected by the manufacturer, which affects the physical and mechanical properties of the product.

3. The color is too dark (too light) after using according to the proportion on the masterbatch instruction

Although this problem is simple, there are many possibilities, specifically:

1) The color masterbatch has not been tested carefully, and the pigment is too little or too much

2) The measurement is inaccurate when in use, and there are a lot of random measurement by domestic enterprises, especially small and medium-sized enterprises.

3) There is a problem with the matching of the color masterbatch and the resin. This may be caused by improper selection of the carrier of the color masterbatch, or the manufacturer may change the resin variety at will

4) The temperature of the machine is improper, and the color masterbatch stays in the machine for too long

Processing procedure: Firstly, check whether the resin type matches the masterbatch and whether the measurement is accurate. Secondly, adjust the temperature or speed of the machine. If there are still problems, contact the masterbatch manufacturer.

The above is the Common problems of PET masterbatch-part 1 we have listed for you. You can submit the following form to obtain more industry information we provide for you.

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