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Plastic channel system is generally trapezoidal or trapezoidal in cross section adjustment for easy installation process and pull latch opening mold vents. The advantage of this type can be arranged in multiple cavity vents for large cavity, makes filling fast and better. However, can cause overheating of materials with long fiber structure and low viscosity. The size of the vents key point, if the Closing too big or too small, the taper portion of its traces found very clearly.
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