How to solve the imbalance of PP injection molding
2019-03-11 10:30 来源:凯杰塑料填充母料厂家作者:熊猫 Time: 2019-03-11 10:30 Source: Qiagen manufacturers of plastic filled masterbatch: Panda
PP injection is uneven, and there are flashes on the side of lack of plastic. Filler masterbatch manufacturer Kaijie Plastics will help you analyze the cause and tell you the solution.
Injection molding manufacturers are prone to unevenness in the production of PP injection molding. One side lacks glue but the other side does flash. 也遇见过不少这样的客户，也去到过客户车间了解过，下面凯杰就来分析下原因，并且告诉大家一个解决方法。 As a filling masterbatch manufacturer for more than 20 years, Kaijie has also met many such customers and visited customer workshops. Kaijie will analyze the reasons and tell you a solution.
We usually have to consider a lot of factors in production, how to meet the basic quality requirements and mass production efficiency requirements. In fact, under the premise of meeting quality requirements / mass production requirements, the parameters such as temperature / pressure / speed can be adjusted in a large range Big. So for a small probability that is not within a hundred miles, it is generally better not to change the main parameters. First look at how this small probability comes. Experience tells us that it is the uneven filling on both sides caused by cold materials.
At the beginning of injection, the cavity pressure is "0", and the two strands of material go on both sides. If there is any flow that is not smooth, even if it is just a little cold material, then the material will go to the other side without suspense. Insufficient condition. In addition, the product is one out of two, which confirms this inference.
The solution: increase the cold material well, pay attention to the cold material well of the side branch. The nozzle heating ring is moved forward and the glue is pumped after the glue is melted (to reduce the possibility of cold materials). Once the glue is shot at a medium speed, the gate will be smoothed with a grinder if it is not possible. By the way, PP material has 2 major characteristics. The first is that it is not sensitive to temperature, higher than 180 degrees, it is too high, it is not good, it does not improve the viscosity and fluidity, but it can improve the mixing effect. The second is the low thermal conductivity of PP, slow cooling, and long gate closing time. It doesn't matter if the injection time is more than ten seconds. The material can be shot slowly, which gives you a wide range of adjustment.
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