Trusted China Pet Bottle Maker - Jilian Plastic Mould

Posted by nicolepreform on Dez 4, 2018 in News |

Once the plastic reaches its proper melt viscosity, it must enter the Pet Preform mold through the injection nozzle. The function of the mold is to shape and then cool the plastic melt. The mold is usually made of tool steel. These cavities are machined from small pieces (inserts) made of tool steel that are hardened and inserted into standard or custom mold bases. A feed system consisting of a gate, a cold plug, a runner, and a gate feeds molten plastic from the nozzle into the mold cavity.
The injection inlet is a conical passage that delivers the melt from the nozzle to the cold section plug. The cold section plug receives the plastic leading edge from the nozzle. The leading edge is always less viscous than the melt behind it and must be deposited in the cold section plug, otherwise the flow path will be blocked. Once the pressure in the main flow rises, the plastic melt enters the flow path. The melt moves down the flow path until a small limit is reached at the end of the flow path, which marks entry into the cavity. This limitation is called the door. It keeps the melt until the entire runner system is full. Once the sprue system reaches maximum pressure, the melt breaks through the small limit of the gate and fills the mold cavity. The rapid filling of the cavity results in air compression and small combustion on the plastic surface. This creates a trace of combustion that is relieved by expelling the mold where the combustion takes place.
The mold provides access to cooling, heating and exhaust in the mold cavity. The ram and other release devices are incorporated into the mold as needed. The choice of formwork depends on the cost, configuration, and production requirements of the part. For high volume production, the initial cost of quality tools is a reasonable investment. The choice of tool steel depends on the quantity and quality of the part to be produced and will be determined primarily by the type of polymer used in the application.
Important features of injection molds:
Balance of the flow path: This means that the flow of plastic to each part of the mold should be exactly the same. This helps maintain the consistency of the parts in the same shot.
Uniform water cooling of the mold: The core and cavity of the mold should be evenly cooled to obtain a good part.
No deformation: Ensure that the mold does not bend or deform when the plastic is injected into the mold.
Exhaust Mold: The mold should be vented so that no air pressure is created during the injection process, resulting in air traps in the part.
As a professional China Pet Bottle manufacturer, Jilian Plastic Mould is very professional and experienced in the production technology of pet prefabricated parts. We have many years of experience in product design and production. It can be said that you are the most trustworthy. one’s business Patner.

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