| 摘要 |
A shutoff nozzle and valve assembly for gas-assisted injection molding having a nozzle body, a shutoff pin, a helical spring, a spring guide and a gas-injection valve assembly. The shutoff nozzle and valve assembly is a simple design including minimal components, thereby resulting in ease of maintenance and reduced cost. The nozzle assembly is self-actuating, using direct resin pressure to open the valve thereby enabling the flow of molten resin through the nozzle and into a mold cavity. After injection of the molten resin, the helical spring automatically engages the shutoff pin thereby closing the nozzle and valve assembly to prevent backflow. The gas-injection valve assembly is similarly self-actuating such that minimal operator supervision is required to operate the nozzle assembly.
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