The mold is composed of a movable mold and a fixed mold. The movable mold is installed on the movable template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine.
Gating system
The gating system refers to the part of the runner before the plastic enters the cavity from the nozzle, including the main runner, cold material cavity, runner and gate, etc.
Main road
It is a passage in the mold that connects the nozzle of the injection molding machine to the runner or cavity. The top of the main runner is concave in order to connect with the nozzle. The diameter of the main runner inlet should be slightly larger than the nozzle diameter (0.8mm) to avoid overflow and prevent the two from being blocked due to inaccurate connection.
Cold slug
It is a cavity set at the end of the main runner to trap the cold material generated between two injections at the end of the nozzle, so as to prevent the clogging of the runner or gate. Once the cold material is mixed into the cavity, internal stress is likely to occur in the manufactured product. The diameter of the cold slug hole is about 8-10mm and the depth is 6mm.
Shunt
It is the channel connecting the main channel and each cavity in the multi-slot mold. In order to make the melt fill the cavities at the same speed, the arrangement of the runners on the mold should be symmetrical and equidistant.
Gate
It is the channel connecting the main runner (or branch runner) and the cavity. The cross-sectional area of the channel can be equal to the main flow channel (or branch channel), but it is usually reduced. So it is the smallest cross-sectional area in the entire runner system. The shape and size of the gate have a great influence on the quality of the product.
Temperature control system
In order to meet the requirements of the injection process on the mold temperature, a temperature adjustment system is required to adjust the mold temperature. For injection molds for thermoplastics, a cooling system is mainly designed to cool the mold. The common method of mold cooling is to open a cooling water channel in the mold, and use the circulating cooling water to take away the heat of the mold.
Post time: Nov-30-2021