Plastic molds can be classified into three categories based on the different types of injection molding systems
(1) Classification of plastic molds – large water mouth molds
The runner and gate are located on the parting line and demolded together with the product during mold opening. The design is the simplest, easy to process, and the cost is lower, so many people use a large water gate system for operation.
(2) Classification of plastic molds – Fine nozzle molds
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, which is complex in design and difficult to process. Generally, a fine nozzle system should be selected according to product requirements.
(3) Classification of plastic molds – runner molds
The structure of this type of mold is generally the same as that of a fine nozzle, with the biggest difference being that the runner is located in one or more hot runner plates and hot pump mouths with constant temperature, without cold material demolding. The runner and gate are directly on the product, so the runner does not need demolding. This system, also known as a non nozzle system, can save raw materials and is suitable for situations where raw materials are expensive and product requirements are high. Design and processing are difficult, and mold costs are high.
Hot runner system, also known as hot runner system, mainly consists of hot runner sleeve, hot runner plate, and temperature control electrical box. Our common hot runner systems come in two forms: single point hot gate and multi-point hot gate. Single point hot gate is a plastic mold that uses a single hot gate sleeve to directly inject molten plastic into the mold cavity. It is suitable for single cavity and single gate plastic molds; Multi point hot runner is a method of branching molten material into various sub hot runner sleeves through a hot runner plate and then entering the mold cavity. It is suitable for single cavity multi-point feeding or multi cavity molds