June 12, 2020

Application and skills for adjusting the filling speed of each cavity

In a multi-cavity mold, the filling speed of various cavities is often uneven (unbalanced). Some cavities are filled quickly, and some are filled slowly. At this time, injection parts with fast filling are prone to problems such as overflow, white top and trapped gas, while slow filling is prone to shrinkage or insufficient filling. The two restrict each other. When the unevenness is serious, it will make it very difficult to adjust the machine. It is necessary to use some skills when adjusting the machine to solve these conflicting problems at the same time.

Adjusting the filling speed of each cavity is often used by some technicians to solve a variety of difficult problems in production. At the same time, ordinary technicians can easily control production without spending too much energy to adjust the machine and maintain production. It is an effective measure to solve the problem.

Generally, increasing the gate and runner can increase the injection pressure and speed of the cavity accordingly. On the contrary, it plays a role in reducing pressure and speed. Using this method, you can easily adjust the filling speed of each cavity.

In actual production, you can use the following adjustment techniques to solve different problems or problems according to different needs.

First of all, the gates of each cavity can be adjusted to be non-uniform, so as to achieve the purpose that each cavity needs different pressure and speed to solve their respective problems at the same time. It is often the case that the pressure or speed of a certain cavity can be higher, and the pressure and speed of other cavities cannot be increased together, and sometimes it may be lowered. For example, if the injection part of a cavity has air lines, the problem of slowing down the injection speed will be solved, but the problem of insufficient filling or shrinkage in another cavity will be solved. Slow, or adjust the insufficient filling or shrinkage, etc.

Secondly, the filling speed of each cavity is adjusted to be uniform, so that the injection parts of each cavity can fill the cavity almost at the same time, so as to solve the aforementioned overflow caused by uneven filling and insufficient filling The problem. In addition, the filling speed of each cavity is adjusted to be uniform, and when multi-stage injection, multiple identical injection parts in the same mold can be staged at the same position to solve the same injection problem at the same time.

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Injection Molding, Plastic Mold Case, Plastic Molding Design, Plastic Parts
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