Plastic principle: the flat plastic sheet heating soft, using vacuum adsorption in the surface of the die, formed after cooling.
吸塑原理：将平展的塑料硬片材加热变软后，采用真空吸附于模具表面，冷却后成型。
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In sheet metal, drawing is a process of forming flatsheet metal into hollow shapes by mean of a punch that causes the metal to flow into the die cavity.