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Why do injection molding machines and PET machine molds generally do not need core pulling?

The reason why the injection mold needs to be core-pulled separately is because the direction of core-pulling is different from the direction of mold opening and demolding. If you do not pull the core separately, once the mold is opened and demolded, the core of the core pull will be crooked or broken, so that the mold will be stuck.

Therefore, before the injection mold is opened, the core pulling in different directions must be separated first, so that the direction of movement of the opening and ejection will not affect the normal ejection action. There is no such problem for the core parallel to the direction of mold opening movement. The core is demolded at the same time as the mold is opened. The core pulling of the injection molding machine is the process of making the optical fiber preform into a standard optical fiber.

The specific process is as follows, under the control of the speed control system, the optical fiber preform is slowly sent into the high temperature furnace. The temperature field in the furnace is pre-designed as a longitudinal gradient distribution. The furnace temperature is monitored by the measuring instrument and fed back to the temperature control equipment to achieve constant temperature. The core is pulled out first and then ejected.

The core pulling is controlled by the bai time and the air pressure stroke du limit sensor. The function of the sensor is to prepare for the next ejection. Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment that uses plastic molding dies to make thermoplastic or thermoset plastics into various shapes of plastic products. Divided into vertical, horizontal and all-electric. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it shoot out and fill the mold cavity.More about:Injection Molding Machine