Analysis of some factors of mold injection molding

Author: MULAN - Plastic Molding Manufacturer

1. Pressure The action pressure provided by the pressure system (oil pump) or servo motor of the injection molding machine is mainly used for the injection device, the melting device, the opening and closing device, the ejector device, the injection device and the core pulling device. After the injection mold processing manufacturer enters the relevant parameters on the control panel of the injection molding machine, the processor converts them into signals for each program action, thereby controlling the pressure required to execute each action program. 2. The speed is matched with the above pressure to complete the action speed (system hydraulic oil flow rate) required for each action program.

The basic speed grades are divided into: slow speed 0.1-10, slow speed 11-30, medium speed 31-60, high speed 61-99. The control of injection speed is suitable for different product structures and materials to set the size and value. There is no distinction here (engineering/general plastics, crystalline/amorphous plastics, high/low temperature plastics, soft/hard plastics). It is easy to confuse audio and video, so I will give a more understandable explanation.

Injection speed is a process element that is difficult to control in injection molding. Unlike other process elements, there are standard data for reference (will be described in detail later). The numerical setting of the injection speed mainly has the following points: the mold injection manufacturer depends on the fluidity of the material; such as PP, LDPE, TPE, TPR, TPU, PVC and other soft plastics have good fluidity, and the cavity resistance is small when filling.

Typically, lower injection speeds can be used to fill cavities. Commonly used medium-viscosity plastics such as ABS, HIPS, GPPS, POM, PMMA, PC+ABS, Q glue, K glue, HDPE, etc. In the case of wall thickness or bone thickness above 1.5mm, the injection speed can be filled at a medium speed.

On the contrary, the filling speed should be appropriately increased according to the product structure or appearance requirements. Engineering plastics such as PC, PA+GF, PBT+GF, LCP and other engineering plastics have poor fluidity, and generally require high-speed injection when filling, especially materials with GF (glass fiber) added. If the injection speed is too slow, it will cause the surface of the product.

Severe floating fibers (silver streaks on the surface). 3. Melting speed control; this parameter is one of the most easily overlooked processes in daily work, because most colleagues think that the process has little effect on molding, and they can adjust the parameters at will to make products, but the melt parameters in injection molding are the same. Glue application speed is equally important.

Melting speed can directly affect important links such as melt mixing effect and molding cycle, which will be introduced in detail in the following chapters. The above content is the relevant knowledge of injection molding explained in detail by injection mold processing manufacturers. I believe that everyone has further study and understanding.

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