This situation often occurs when operating a vertical injection molding machine; If the first few molds are filled with injection molding, they become dissatisfied after making a few molds of the product; Then it would be better to adjust the machine and make a few empty molds. The same problem occurs in the follow-up work. You need to add some injection pressure while doing it. What is the reason why you need to reduce some pressure after doing it for a while? How can you adjust the machine pressure to stabilize it? Is it related to the instability of the machine? Next, the editor will tell you about these issues.
The basic reason for this issue can be determined as follows:
The nozzle overflows or leaks glue. The reason is that the front end of the nozzle is blocked. Of course, the mold is empty. Then why is the lower mold better? The reason is that the last glue overflow may have melted due to time problems. If it was not completed last time, it is likely that the next the first mock examination has too much material, which is easy to cause excessive pressure
At the same time, there is often a phenomenon of sometimes adding pressure as you mentioned. When you add it, if there is no overflow, the pressure becomes too high.
Handling method:
1. Increase the nozzle and duct temperature
2. Adjust the injection position and pressure, and use high pressure for short range
3. Holding pressure too high or too long, shooting time too long, etc
4. Increase the looseness. If the looseness is large enough, you need to check if the joint between the adhesive channel and the nozzle is still reasonable. Usually, we have paper covering treatment
Another issue is that there are foreign objects inside your screw, which may occasionally block the nozzle
Another point is to consider the instability of other pressures and flow rates
