Screw-type low pressure injection molding machine and method of injection molding

A screw-type low pressure injection molding apparatus comprising:

• a gun barrel, wherein the outer wall of the gun barrel is provided with a heating body;
• wherein the heating body comprises the first-stage heating body, the second-stage heating body and the third-stage heating body;
• wherein the upper end of the gun barrel is sealed to an upper sealing block and the side wall of the upper sealing block is interconnected to the charging barrel;
• wherein a screw is provided in the sealing lip of the upper end of the sealing block and the upper end of the screw is connected to a driving device and driven by this driving device;
• wherein the lower end of the screw extends into the lower end of the gun barrel and the lower end of the gun barrel is sealed to the heating device;
• wherein the lower end of the gun barrel is connected to the rubber stock chamber formed inside of the heating device;
• wherein one side of the heating device is provided with the first pressure sensor and the sampling terminal of the first pressure sensor extends into the rubber stock chamber;
• wherein the heat device is further provided with a discharge hole, which is interconnected to the rubber stock chamber;
• wherein one side of the discharge hole is provided with a charge hole, which is interconnected to the rubber hose connecting hole located at the lower side of the heating device;
• wherein the driving device and the first pressure sensor are both connected to a controller.