Disc Heel Forming Machine Single cold tuning methods and skills

temperature control

1. Cylinder temperature:

The temperature to be controlled in the Disc Heel Forming Machine Single cold process includes barrel temperature, nozzle temperature, mold temperature, etc. The former mainly affects the plasticization and flow of plastics, while the latter mainly affects the flow and cooling of plastics. Each plastic has a different flow temperature. The same plastic has different flow temperature and decomposition temperature due to different raw materials or grades. The main reason is that the average molecular weight and relative molecular weight distribution are different. The plasticizing process is also different, therefore, the selection cylinder temperature is also different.

2. Nozzle temperature:

Disc Heel Forming Machine Single cold In order to prevent the "drool" that may occur in the straight-through nozzle, the temperature of the nozzle is generally slightly lower than the maximum temperature of the barrel. The temperature of the nozzle should not be too low, otherwise it will cause premature solidification of the melt, blockage of the nozzle*, or affect product performance due to the injection of condensate into the cavity.

3. Mold temperature:

Disc Heel Forming Machine Single cold The mold temperature has an important influence on the internal performance and appearance quality of the product. Whether plastic crystallization exists is determined by mold temperature, injection pressure, molding cycle, etc., the size and structure of the product, performance requirements, and other process conditions (melt temperature, injection speed and injection pressure, molding cycle, etc.).

Pressure control:

Disc Heel Forming Machine Single cold injection process pressure is divided into two types: plasticizing pressure and injection pressure, which directly affect the plasticizing of plastics and product quality.
Back pressure When the screw injection machine is used, the pressure generated by the molten material at the top of the screw when the screw rotates back is called the plasticizing pressure, also known as the back pressure, and the pressure can be adjusted by the overflow valve in the hydraulic system.
The injection pressure of Disc Heel Forming Machine Single cold is constant with the screw speed. When the injection pressure increases, the temperature of the melt will rise, but the plasticizing speed will slow down, and the increase of the plasticizing pressure will often lead to melting. The temperature of the melt is uniform, the color material is mixed evenly, and the gas in the melt is discharged. Generally speaking, under the premise of ensuring product quality, the plasticizing pressure should be determined as low as possible. The specific value varies with the type of plastic used, but usually rarely exceeds 20 kg per square centimeter.