The cycle time for injection molding

Generally speaking, In case of products quality ensured, the shorter the injection molding cycle time will be better. It usually includes the following items for cycle time.

Injection time(pressusre holding time included)
Plastic melting time
Cooling time
Ejection time
Clamping time with low pressure

1, Injection time(pressusre holding time included)

it generally seems that the longer the injection time is, the more saturated the product will be. However, when we focus on quality, we must also consider the production capacity. if the injection time is too long, it may cause the product to be too full and lead to There are a series of problems such as ejection deformation, oversize, the molding products being sticky with mold, so we should make overall consideration when setting the injection time that try to shorten the injection time in the case of meeting quality requirements. 

2, Plastic melting time 

The length of melting time depends on the speed of the melting speed setting and the size of the back pressure setting, the length of melting time control must be shorter than the cooling time.

3, Cooling time

 The length of cooling time directly affects the molding cycle. The longer the cooling time is, the longer the molding time and the lower the production capacity will be. Therefore, when we set the high-pressure cooling time, as long as we can ensure smooth products molding and not directly have affects such as deformation, the shorter the setting time will be better. 

4, Ejection time

The ejection time is generally appropriate to cooperate with the manipulator. In fully automatic production with manipultor, the ejection dwell time is generally maintained for 1.5-2 seconds. In semi-automatic production, if the ejector needle is returned , which lead to products fall or be stuck and product can't be removed, the dwell time should be held for about 5 seconds. 

5, Clamping time with low pressure

It plays a great role in protecting our personal safety and the safety of the mold. With the adjustment of the low-pressure position and low-pressure pressure of the mold, the low-pressure protection time should be 1-3 seconds. The shorter the protection time is, the smaller the possible harm will be.