The most popular waste free injection transfer mol

Waste free injection transfer molding technology system

the traditional transfer molding process is widely used by manufacturers for the molding and manufacturing of various rubber parts. Its advantage is that it only needs lower fixed equipment capital and tool cost. The problem with the traditional transfer molding process is that grinding increases the additional labor cost and the scrap rate on the transfer pad. The most common defects of injection/transfer molding are incomplete filling, bubble impurities and excess burrs in the parts

the main objective of transfer molding is to obtain a semi-finished product with as little overflow as possible. In the past, the best way to achieve this was through the use of cold runner injection molding technology. As the thickness of the rotating plate has been greatly reduced, it is possible to reduce the waste. In addition, the material is plasticized by the screw during transmission and the viscosity is weakened

Panshi has developed an injection/transfer machine, which can reduce the dependence on grinding and eliminate the transfer pad, thus providing consumers with more competitive prices. According to customers' requirements, Panshi can provide a series of different machine sizes. The hydraulic forming machine of Panshi company is shown in Figure 1

Figure 1. The technology of the hydraulic molding machine

system of Panshi company is based on accurate temperature control, which is realized by using the cold channel injection plate and the cooling plate. In this way, the materials in the mold can be vulcanized, and the materials in the cold channel injection plate in the next cycle still stay in the raw material, so that customers can better understand the important status of the company's strength. The rubber flows directly into the specific gate on the upper part of the mold. Once there is material in the mold, the pressure will open and the mold will remain closed due to the use of the fixture. Once the pressure is turned on and the die remains closed due to the fixture, the pressure is repeated in the piston plate and the heating/cooling plate to maintain the positive pressure and heating in the tank. The pressure causes the fixture to re clamp or close, and then the cycle ends. This technology is applicable to customers' existing transfer molds, as well as new processing

equipment overview

the injection molding machine is characterized by FIFO (first in first out) operation mode. The hydraulic tong has a full stroke piston cylinder. There is a hoist in the upper center. The front shuttle is mainly used for demoulding, while the rear shuttle is used for piston plate and heating/cooling plate

mobile heating plate combines cooling plate/insulation plate/heating plate/existing piston plate or new mold, etc. The equipment includes a cold runner injection plate and a cold runner plate

during the operation of the machine

in the traditional transfer molding method, the rubber is cut by the rolling mill. It can be seen that the deficiency is that the strength and hardness are low and the rubber roll is formed. The operator places the rubber roller in the piston chamber and turns off the machine; The piston pushes the rubber roller into the transfer tank; At the position of 90 °, then shut down the machine and remove the fixture; The material is transferred to the mold; Part forming; Press on; When the transfer pad (waste) is removed, the parts can be demoulded

with Panshi's waste free injection/transfer molding technology, the equipment starts from the open position. The middle heating plate moves out of the press plate distance; The master cylinder is lifted up and clamped; The rubber is injected from the piston disk/transfer tank mouth on the mold; At the same time, the press release makes the fixture loose and move down, and the lifting mechanism at the bottom whose production cycle is about 1 week keeps the mold closed; The heating plate in the middle is moved between the plates of the press; The master cylinder moves upward and is clamped; Start of part forming; At the same time, the press release makes the fixture loose and move down, and the lifting mechanism at the bottom still keeps the mold closed; When the press reaches its open position, the heating plate in the middle is removed from the front section of the press; Then the demoulding of the parts is completed. The whole operation process is divided into 8 steps, as shown in Figure 2

Figure 2. Waste free injection/transfer molding technology

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