plastic mould and custom injection moulding tips

The gate is a short groove with a small cross-sectional area to connect the runner and the cavity. Therefore, the cross-sectional area should be small in order to obtain : Soon after the cavity is injected full, the gate will be solidified Simple demoulding The part ejection is completed, leaving only a few traces Makes the filling of multiple cavities easier to control Reduce excessive runner scrap Gate location and size 1) Place the gate at the thickest part of the product, and injection on the thickest part can provide better filling and pressure holding . If the holding pressure is insufficient, the thinner area will solidify faster than the thicker area. Avoid placing the gate at a sudden thickness change section to avoid hysteresis or short shots. 2) If possible, set the gate in the center of the product . Placing the gate in the center of the product can provide equal length flow. The flow length will affect the required injection pressure. The central gate mak...

In the process of injection molding, the bubble inside is a serious defect. Air bubbles in injection molded transparent parts will affect the appearance quality of products. At the same time, it will also reduce the strength of injection molded products. The bubbles are mainly produced in the process of injection molding: The raw materials are not dried enough or air mixed in the raw materials. In the injection molding process, the injection speed is too fast, the residual material inside barrel is too much, and the back pressure is too low. Poor mold venting and low mold temperature. How to solve: Raw materials should be fully dried. Reduce the screw temperature and the temperature of the feeding port. Increase the back pressure  and reduce the ejection position of screw (more residual material). Reduce injection speed and increase mold temperature. Increase the injection pressure and time and improve the venting of the mold. Retain bubbles on the nozz...

One of the important reasons for the warpage of strip flat injection molding parts is the position of the gate on the injection molding parts. There are usually three positions of the gate on the strip injection molded part,and these will cause warpage of the strip-shaped flat injection molded parts. [caption id="attachment_4417" align="aligncenter" width="563"] strip-shaped flat parts injection molding[/caption]   For example (Figure A) , the gate position of the strip flat plate is set at one end of the injection-molded part, which can make the injection-molded part obtain consistent shrinkage in the flow direction. Injection molding : Injection molding is relatively simple for long flat injection molding parts with this gate position . However, it should be noted that the distance from the gate to the end of the injection molded part couldn't be too long, so as to prevent the deformation caused by the different filling. Mold : For the long strip-...