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Weld marks in injection molding: causes, effects and solutions
During the injection molding process, we may encounter a common problem - weld marks. So what is a splice mark? What is its effect in injection molding process? And how to solve such a problem?
In the plastic injection molding process, if two or more strands of molten plastic meet in the mold, due to different cooling speeds, the formation of the combined part of the formation of the obvious joint line, which is what we call "Weld marks". This is what we call a "weld mark". The visual effect of this mark on the surface of the product is not ideal, and if it is serious, it will affect the quality and aesthetics of the product.
Next, let's take a look at the impact of weld marks on injection molding.
The appearance of weld marks will reduce the strength and toughness of the product, making the product in the use of the process is prone to breakage, deformation and other problems. In addition, splice marks will also affect the appearance quality of the product, so that the surface of the product is not smooth and flat enough, affecting the sales of the product. Therefore, how to eliminate or reduce the fusion welding marks is a problem that every injection molding processing enterprise needs to pay attention to.
How to solve the problem of weld marks in injection molding processing? These several solutions can be adopted:
1. Adjust the injection speed and pressure: By adjusting the injection speed and pressure, it makes the plastic filling in the mold more uniform, thus reducing the generation of weld marks.
2. Optimize the mold design: By optimizing the structure of the mold, the flow of plastic in the mold will be smoother, thus reducing the production of weld marks.
3. Adjust the cooling time: By adjusting the cooling time, the plastic has enough time to fill and solidify in the mold, thus reducing the generation of weld marks.
4. Use the right plastic material: different plastic materials have different flow and cooling speeds, choosing the right plastic material can also effectively reduce the generation of weld marks.
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