Under normal circumstances, the serious problem of dullness on the surface of PVC injection molded parts (the gloss is not enough) is usually solved. Most of them are solved by increasing the temperature of the melt and the mold. Appropriately increasing the melt back pressure can also make the surface of the injection molded parts [...]
In the past, the problem of brittleness of injection molded PC materials was rarely seen. That was because the PC materials brands used at that time were relatively small. Usually, only two types of PC7025A and 1250Y made in Japan were used. Nowadays, there are more and more manufacturers producing PC materials, and there are [...]
Sometimes because the flow channel is too long, the melt at the forefront is cooled too much, which leads to injection moldings with radial lines and shock lines, and the performance of PC materials in this regard is particularly prominent, followed by transparent PVC. This is why sometimes the melt temperature has risen so high [...]
According to the principle of material solidification, the reason for the formation of internal shrinkage holes and surface shrinkage of the injection molded part is that the melt needs to continuously shrink during the cooling process. When the shrinkage is concentrated to the position where the injection molded part is finally solidified, and the melt [...]
POM are easily decomposed by heat, and there is a troublesome problem. When the raw materials are decomposed by heat, impurities will be generated in the dead corner of the mold. For a long time, the accumulation of more and more, the dead corner will be filled with impurities, resulting in lack of injection molding [...]
When producing transparent plastic parts, it often happens that the injection molding takes more than ten hours, or even a few days, and the black spots cannot be removed. Not only waste a lot of production time, but also waste a lot of the company's raw materials. Therefore, how to prevent the problem of many [...]
Difficult to fill raw materials and injection parts with larger and thinner sizes usually need to be filled with a faster injection speed to fill the cavity. However, many injection-molded parts will produce obvious ridges or gas lines around the gate, and problems such as scorching after injection of the injection parts. Especially when spraying [...]
When pitting occurs, it is easy to think about whether the mold is rusty. However, upon closer inspection, it was found that the mold was still quite bright and there were no small marks. After increasing the melt temperature and back pressure to improve the quality of the melt, the situation will improve, but sometimes [...]
Most of the junior and intermediate injection molding technicians only use the first-level injection method for injection molding production. Many problems such as overflow and shrinkage in production can be solved with only one-stage injection adjustment. As a result, it gradually became a habit that has not changed for many years. When there are some [...]
1, The melt filling speed is too slow Generally, too fast filling speed will cause problems such as overflow and white top. However, if the speed is too slow, it is also easy to cause such problems. If the speed is too slow and the filling time is too long, it will be more difficult [...]
