The Molding Cycle Of The Injection Mold

The time required to complete an injection molding process is called the molding cycle, also known as the molding cycle. It actually 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. During the entire molding cycle, the injection time and the cooling time are the most important and have a decisive influence on the quality of the article. 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 holding time in the injection time is the pressure time of the plastic in the cavity, which accounts for a large proportion of the entire injection time, generally about 20-120 seconds (extra thick parts can be as high as 5~10 minutes). Before the melt at the gate is frozen, the holding time has an impact on the dimensional accuracy of the product, and if it is later, it has no effect. The holding time is also the most favorable, and it is known to depend on the feed temperature, mold temperature, and the size of the main channel and gate. If the size of the main channel and gate and the process conditions are normal, it is usually based on the pressure value that obtains the smallest fluctuation range of the shrinkage of the product. The cooling time is mainly determined by the thickness of the product, the thermal properties and crystallization 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 is not caused by changes when demolding, the cooling time is generally between 30~120 seconds, the cooling time is too long is not necessary, not only reduce production efficiency, but also cause difficulty in demolding complex parts, and even produce demolding stress when forced demolding. The rest of the molding cycle is related to whether the production process is continuous and automated, and the degree of continuity and automation.