Three classifications of plastic molds
Plastic molds are divided into: large nozzle molds, thin nozzle molds, and hot runner molds.
1. Dashuikou mold
The runners and gates are on the parting line and are demoulded together with the product when the mold is opened. The design is simplest, easy to process, and the cost is low, so more people use the large sprue system.
2. Fine nozzle mold
The runners and gates are not on the parting line and are usually directly on the product, so it is necessary to design an additional set of nozzle parting lines. The design is more complex and the processing is difficult. Generally, a fine nozzle system is selected depending on the product requirements.
plastic mold
3. Hot runner mold
The structure of this type of mold is roughly the same as that of a fine sprue. The biggest difference is that the runner is located in one or more hot runner plates and hot spouts with constant temperature. There is no cold material to demould, and the runner and gate are directly on the product, so The runner does not need to be demoulded. This system is also called a water outlet system, which can save raw materials. It is suitable for situations where raw materials are expensive, product requirements are high, design and processing are difficult, and mold costs are high.
The plastic mold nozzle can also be called the gate. It refers to the joint between the frame and the parts formed when the factory is casting the model. It can be divided into large nozzle and thin nozzle.
1. The large nozzle refers to the two-plate mold. The water flows to the mold core and then enters the product through the gate. Therefore, the gate position is relatively limited and is generally at the edge of the product.
2. The thin sprue refers to the three-plate mold. The runner is above and behind the front mold. The gate can be placed directly on the product or on the mold core.
There are many places to choose the gate position, and the runner gate and the product will be automatically separated when the mold is opened, eliminating the need to cut the gate.
Cutting off the nozzle is completed in two stages:
1. First, cut the parts from the frame with some water inlets left.
2. Use the model to use a pen knife to neatly cut off the remaining nozzle on the edge of the part.
The direction of the diagonal cutter and the nozzle should be such that the diagonal cutter should be cut along the thinner direction of the nozzle, so that the nozzle will not be excessively twisted and the joint between the nozzle and the part will become white.
When cutting the nozzle with a pen knife, you should cut it bit by bit from top to bottom. This is safe and can make the position of the nozzle of the part flat and smooth.
In addition, in order to make the water mouth less obvious, you can also use sandpaper to sand it in order from coarse to fine.
Xiamen Jinjiekun Industrial specializes in providing one-stop services from mold design, mold manufacturing, mold injection molding, spraying, silk screen printing, hot stamping to assembly.
