Classification of plastic mold①


Release time :

2023-03-14

First of all, let me introduce the classification according to the gating system. Plastic molds can be divided into three categories according to the different gating system types: (1) Dashuikou 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 in cost, so many people use the Dashuikou system for operation. The plastic mold structure is divided into two parts: moving mold and fixed mold. The movable part of the injection machine is a movable mold (mostly the ejection side), and the inactive part at the injection end of the injection machine is called a fixed mold. Because the fixed mold part of Dashuikou mold is generally composed of two steel plates, this kind of structural mold is also called "two-plate mold". The two-plate mold is the simplest structure in the Dashuikou mold.

In the last chapter, we explained the definition of molds, so today I will tell you about the classification of plastic molds.

Plastic molds can be divided into two types, one is classified by gating system, and the other is classified by molding.

First of all, let me introduce the classification according to the gating system.

Plastic molds can be divided into three categories according to the different gating system types:

(1) Dashuikou 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 in cost, so many people use the Dashuikou system for operation. The plastic mold structure is divided into two parts: moving mold and fixed mold. The movable part of the injection machine is a movable mold (mostly the ejection side), and the inactive part at the injection end of the injection machine is called a fixed mold. Because the fixed mold part of Dashuikou mold is generally composed of two steel plates, this kind of structural mold is also called "two-plate mold". The two-plate mold is the simplest structure in the Dashuikou mold.

(2) Fine sprue mold: The runner and gate are not on the parting line, 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 fine nozzle system should be selected according to the product requirements. The fixed mold part of the fine nozzle mold is generally composed of three steel plates, so this kind of structural mold is also called "three-plate mold". The three-plate mold is the simplest structure in the fine nozzle mold.

(3) Hot runner mold: The structure of this type of mold is roughly the same as that of the fine runner. The biggest difference is that the runners are located in one or more hot runner plates and hot nozzles with constant temperature, there is no cold material demoulding, and the runners and gates are directly on the product. Therefore, the runner does not need to be demolded. This system is also called the no-spout system, which can save raw materials. It is suitable for situations where raw materials are expensive and product requirements are high. Design and processing are difficult and mold costs are high. The hot runner system, also known as the hot runner system, is mainly composed of a hot sprue sleeve, a hot runner plate, and a temperature control electric box. Our common hot runner system has two forms: single-point hot gate and multi-point hot gate. The single-point hot gate is to directly inject molten plastic into the cavity with a single hot gate sleeve, and it is suitable for plastic molds with a single cavity and a single gate. The multi-point hot gate is to branch the molten material into each hot sprue sleeve through the hot runner plate and then enter the cavity. It is suitable for single-cavity multi-point feeding or multi-cavity molds.

Due to time constraints, this issue will stop here for everyone, and the next issue will continue to explain the classification of plastic molds.We welcome more people to pay attention to our company, ZHUHAI BAOLI FOAM SPRAY PUMP CO.,LTD.