According to different types of pouring system, plastic […]
According to different types of pouring system, plastic mold parts can be divided into three categories:
(1) Large nozzle mold: The runner and gate are on the parting line, and they are demolded together with the product when the mold is opened. The design is the simplest, easy to process, and low cost, so more people use the large nozzle system to work. The plastic mold structure is divided into two parts: the movable mold and the fixed mold. The movable part of the injection machine is a movable mold (mostly on the ejection side), and the injection end of the injection machine is generally inactive and called a fixed mold. Because the fixed mold part of the large nozzle mold is generally composed of two steel plates, this type of structural mold is also called a two-plate mold. The two-plate mold is the simplest structure in the large nozzle mold.
(2) Fine nozzle mold: runners and gates are not on the parting line, but are usually directly on the product. Therefore, it is necessary to design an additional set of nozzle parting lines. The design is more complicated and the processing is more difficult. Generally, the selection depends on the product requirements. Slim mouth system. The fixed part of the nozzle mold is generally composed of three steel plates, so this type of structural mold is also called the "three-plate mold". The three-plate mold is the simplest structure in the nozzle mold.
(3) Hot runner mold: The structure of this type of mold is roughly the same as the nozzle. The biggest difference is that the runner is located in one or more hot runner plates and hot nozzles with constant temperature. There is no cold material demoulding, runner and pouring. The port is directly on the product, so the runner does not need to be demolded. This system is also called a nozzleless system, which can save raw materials and is suitable for situations where raw materials are more expensive and products require higher requirements. Design and processing are difficult, and mold costs are high. Hot runner system, also known as hot runner system, is mainly composed of hot sprue sleeve, hot runner plate and temperature control electric box. Our common hot runner system has two forms: single-point hot gate and multi-point hot gate. Single-point hot gate uses a single hot sprue sleeve to directly inject molten plastic into the cavity. It is suitable for plastic molds with a single cavity and single gate; multi-point hot gate branches the molten material to each The sub-heat sprue sleeve then enters the cavity. It is suitable for single cavity multi-point feeding or multi-cavity molds.