How much do you know about the working principle of the zipper machine?

u200bThe operation of the zipper machine is mainly controlled by keyboard operation, electrical control system operation and hydraulic system operation. Monitoring of temperature in each section, adjustment of injection pressure and back pressure, etc.

The working principle of injection molding of zipper machinery is a cycle process, each cycle mainly includes: quantitative feeding - melt plasticization - pressure injection - mold filling and cooling - mold opening and pulling. After the plastic part is pulled out, the mold is closed again for the next cycle.

The molding process of the general screw zipper machine is as follows: first, the granular or powdery plastic is added into the barrel, and the plastic is melted by the rotation of the screw and the heating of the outer wall of the barrel.

zipper machine

Then the zipper machine performs mold clamping and forward movement of the injection seat, so that the nozzle is close to the gate of the mold, and then pressurized oil is introduced into the injection cylinder to advance the screw , so that the molten material is injected into a closed mold with a lower temperature at a high pressure and a faster speed.

After the zipper machine is kept for a certain period of time and pressure (also known as pressure holding) and cooled to solidify and form, the mold can be opened to take out the product, and the purpose of the zipper machine to maintain the pressure is to prevent the mold cavity from melting The reverse flow of the material will replenish the material into the cavity, and can ensure that the product has a certain density and dimensional tolerance.

The basic requirements of the working steps of zipper mechanical injection molding are plasticization, injection and molding. Plasticization is the premise of realizing and guaranteeing the quality of molded products, and in order to meet the requirements of molding, sufficient pressure and speed must be ensured during mechanical injection molding of zippers.

At the same time, due to the high injection pressure of zipper mechanical injection molding, a correspondingly high pressure is generated in the mold cavity (the average pressure in the mold cavity is generally between 20~45MPa), so there must be enough Great clamping force. It can be seen that the injection device and the clamping device are the key components in the injection molding process of the zipper mechanical injection molding.