0102030405
How to solve the problem of product cracking after adding masterbatch during injection molding?
2025-09-18
1.The problem of striped pigment bands on products under sunlight needs to be considered from two aspects:
2. The physical and mechanical properties of the plastic and the plastic molding process:
The temperature of the Injection Molding equipment is not properly controlled, and the masterbatch can't be fully mixed with the resin after entering the mixing chamber. The injection molding machine doesn't apply a certain amount of back pressure, and the screw mixing effect is poor. The masterbatch is not dispersed well or the resin is not plasticized well.
The following debugging can be done in terms of process:
1. Slightly increase the temperature of the mixing chamber near the blanking port
2. Apply a certain back pressure to the injection molding machine.
If the above adjustments do not work, there may be problems with the dispersion or matching of the masterbatch and resin. Contact the masterbatch manufacturer for resolution.
After using a certain masterbatch, the product seems to be more prone to cracking. This may be due to poor diffusion and miscibility caused by the dispersant or additive selected by the manufacturer, which affects the physical and mechanical properties of the product. After using the masterbatch according to the ratio specified in the instructions, the color is too dark (too light). Although this problem is simple, there are many possible reasons, including:
1. The masterbatch has not been carefully tested, and the pigment is too little or too much
2. Inaccurate measurement during use, and the phenomenon of arbitrary measurement by small and medium-sized enterprises is prevalent.
3. There is a problem with the matching of the masterbatch and the resin. This may be due to improper selection of the masterbatch carrier or the manufacturer's arbitrary change of the resin type.
4. The machine temperature is inappropriate and the masterbatch stays in the machine for too long.
Processing procedure: First check whether the resin type matches the masterbatch and whether the measurement is accurate. Then adjust the machine temperature or speed.
Why do products with the same masterbatch, resin, and formula have different shades of color when injected by different injection molding machines?
This is often caused by the injection molding machine. Different injection molding machines have different mechanical conditions due to differences in manufacturing, usage time, or maintenance conditions. In particular, the difference in the degree of contact between the heating element and the barrel causes the masterbatch to be dispersed differently in the barrel, which can lead to the above phenomenon.
Will pigment migration during storage of masterbatch affect the quality of the finished product?
Some masterbatches contain high levels of pigment (or dye). In such cases, migration is normal. Masterbatches containing dyes can experience significant migration, especially when dyes are added. However, this doesn't affect the quality of the finished product, as the pigment remains at its normal color-developing concentration after the masterbatch is injected into the finished product.
Why do some injection products have poor gloss?
There are several possibilities:
1. The nozzle temperature of the injection molding machine is too low
2. The mold finish of the injection molding machine is not good
3. The product molding cycle is too long
4. Too much titanium dioxide in the masterbatch
5. The masterbatch is not dispersed well