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Gating system classification

Update:01-03-2019
Summary:

Plastic pet moulds can be divided into three categories […]

Plastic pet moulds can be divided into three categories depending on the type of gating system:
(1) Dashuikou mold: The runner and gate are on the parting line, and the product is demolded together when the mold is opened. The design is the simplest, easy to process, and the cost is low, so many people use the large nozzle system. The plastic mold structure is divided into two parts: dynamic mold and fixed mold. As the active part of the injection machine is a moving mold (mostly the ejection side), the inactive portion of the injection machine is generally called a fixed mold. Since the fixed mold part of the Dashui mold is generally composed of two steel plates, it is also called a two-plate mold. The two-plate mold is the simplest structure in a large nozzle mold.
(2) Sluice nozzle: The runner and gate are not on the parting line, generally directly on the product, so it is necessary to design a set of nozzle parting lines. The design is more complicated and difficult to process. Generally, it depends on the product requirements. Fine water system. The fixed mold part of the fine nozzle mold is generally composed of three steel plates, so it is also called "three-plate mold". The three-plate mold is the simplest structure in a thin nozzle mold.
(3) Hot runner mold: This type of mold structure is basically the same as the fine water nozzle. The biggest difference is that the flow channel is in one or more constant temperature hot runner plates and hot nozzles, no cold material release, flow path and pouring. The mouth is directly on the product, so the flow channel does not need to be demoulded. This system is also called the waterless mouth system, which can save raw materials, is suitable for the case where the raw materials are expensive and the product requirements are high, the design and processing are difficult, and the mold cost is high. The hot runner system, also known as the hot runner system, is mainly composed of a hot sprue bush, a hot runner plate, and a temperature-controlled electric box. Our common hot runner systems are available in single-point hot gates and multi-point hot gates. The 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 a single gate. The multi-point hot gate branches the molten material to each through a hot runner plate. The manifold is re-entered into the cavity, which is suitable for single-cavity multi-point feed or multi-cavity molds.