June 13, 2020

The benefits of larger gates and runners

In the injection molding production process, when adjusting the machine becomes difficult, trying to make some changes in the mold is a wise choice to solve the injection molding problem. Changing the position of the gate, changing the size of the runner, and adjusting the filling speed of each cavity are some of the commonly used methods. Changing the size of the gate and the runner is one of the most commonly used methods.

Changing the gate and runner size usually has the following benefits.

①It helps to reduce or eliminate shrinkage and shrinkage, because the pressure and time obtained by the cavity are increased.

②Enlarging the gate can reduce the injection speed, which is helpful to solve the problems such as gas lines or shooting lines. Gates that are too small are often the main cause of defects such as gas lines, jet lines and serpentine lines.

③When the gate is increased to a large enough, the injection speed can be adjusted slower, the gate water ripple problem of thick and large-sized injection parts will therefore be solved well.

④After the gate is enlarged, filling becomes easier, which helps to solve the problem of difficult filling. At the same time, the injection pressure can be adjusted lower, which is beneficial to prevent overflow, product sticking and thimble breakage.

⑤ It can make the melt filling more stable, which is convenient to solve the problem of welding marks of injection parts.

⑥The gate speed of each cavity can be adjusted to be balanced or unbalanced to solve the problem of unbalanced filling of each cavity.

In engineering practice, under normal circumstances, generally increase the gate size first, and then increase the flow channel size if necessary. It should be noted that if the gate size is too large, the gate of hard plastic parts will become brittle, which will affect the impact resistance of the injection molded parts.

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