The reason for the bending of the biobased dinner knife is that due to the defect characteristics of the biobased dinner knife, the shape of the injection part is similar to the mold cavity, but it is a deformed version of the mold cavity shape.

biobased dinner knife Possible causes of bending problems:

1. The bending of biobased dinner knife is caused by excessive internal stress of biobased dinner knife.

2, the mold filling speed is slow, resulting in biobased dinner knife bending.

3. Insufficient plastic in the mold cavity leads to bending of the biobased dinner knife.

biobased dinner knife

4, if the plastic temperature is too low or inconsistent, it may also be bent by biobased dinner knife.

5, biobased dinner knife when the temperature is too high.

6, dynamic, fixed mold cooling insufficient or inconsistent temperature.

7, biobased dinner knife structure is unreasonable (such as reinforcement concentrated on one side, but far away).

biobased dinner knife bending remedies:

1, reduce injection pressure.

2, shorten the screw forward time.

3. Increase cycle time (especially cooling time). Immediately after ejected from the mold (especially a thicker biobased dinner knife), immerse it in warm water (38°C) to allow the biobased dinner knife to cool slowly.

4, improve the injection speed.

5, increase the temperature of plastic.

6. Use cooling equipment to cool bent biobased dinner knife.

7. Appropriately increase the cooling time of the bending biobased dinner knife or improve the cooling conditions to ensure that the mold temperature of the moving and fixed molds is as consistent as possible.

8, according to the actual situation, if permitted, the structure of the curved biobased dinner knife is improved.

When producing important biobased dinner knives with accurate dimensional requirements, the allowable fluctuation range of each part size is very small, and even only one or two wires are required.

In the production process, the main factor affecting the dimensional accuracy of biobased dinner knife is the shrinkage of biobased dinner knife. The greater the shrinkage, the worse the accuracy. Therefore, due to the large shrinkage of PP and POMbiobased dinner knives, the accuracy of their biobased dinner knives is usually poor, which is the reason. The shrinkage rate of other materials is usually not very small, so the dimensional accuracy of biobased dinner knives is not very high under general injection molding conditions.

In fact, by adjusting the machine can reduce the shrinkage of the biobased dinner knife, thereby improving the dimensional accuracy of the biobased dinner knife. We only need to greatly increase the time and pressure of gluing or holding pressure, which can reduce the shrinkage of biobased dinner knife, significantly reduce the shrinkage rate, and naturally improve the dimensional accuracy.

Due to the limitation of the quality of the injection molding machine, the injection pressure cannot be adjusted too high, otherwise a large number of batch fronts will be produced. Therefore, in the ordinary injection molding machine, the dimensional accuracy of the biobased dinner knife is mainly improved by increasing the injection time or holding pressure. In order to ensure the dimensional accuracy of the biobased dinner knife, the accuracy of the mold is the first condition to ensure, and it is more important to choose a stable and reliable injection molding machine (small parameter fluctuation) and enough pressure for production.

Some of the newly developed high-precision injection molding machines are actually high-pressure injection molding machines with stable performance and high parameter accuracy. It is reported that the shrinkage rate of its biobased dinner knife can be almost 0, that is, the size of each biobased dinner knife is almost as long as the size of the cavity, and the fluctuation range is only about one trace, with high precision.

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