The time required to complete an injection molding process is called the molding cycle, also known as the molding cycle.

It includes the following parts: Molding cycle: The molding cycle directly affects labor productivity and equipment utilization.

Therefore, in the production process, the relevant time in the molding cycle should be shortened as much as possible under the premise of ensuring quality.

In the whole molding cycle, the injection time and cooling time are the most important, they have a decisive influence on the quality of the product.

The filling time in the injection time is directly inversely proportional to the filling rate, and the filling time in production is generally about 3-5 seconds.

The pressure holding time in the injection time is the pressure time for the plastic in the cavity, which accounts for a large proportion of the entire injection time, generally about 20-120 seconds (the extra thick parts can be as high as 5-10 minutes).

Before the molten material at the gate is frozen, the amount of pressure holding time has an impact on the dimensional accuracy of the product, and if it is later, it has no effect.

The dwell time also has the best value, which is known to depend on the material temperature, mold temperature, and the size of the sprue and gate.

If the dimensions of the sprue and gate and the process conditions are normal, usually the pressure value with the smallest fluctuation range of product shrinkage shall prevail.

The cooling time is mainly determined by the thickness of the product, the thermal and crystalline properties of the plastic, and the mold temperature.

The end of the cooling time should be based on the principle of ensuring that the product does not change when demolding.

The cooling time is generally between 30 and 120 seconds. If the cooling time is too long, it is not necessary, which not only reduces the production efficiency but also affects the complex parts.

Difficulty in demolding and even demolding stress will occur when demolding is forced.

The other time in the molding cycle is related to whether the production process is continuous and automated, and the degree of continuous and automated.