Coating cavity exhaust structure, system and method used for in-mold coating process

Abstract

The present application relates to a mold exhaust structure, system and method used for an in-mold coating process, aiming to precisely control gas exhaust and fluid filling, so as to significantly reduce the phenomena of bubbles and air entrapment and improve the appearance quality and functionality of products. The exhaust structure comprises a coating cavity, a feeding device, a first flow channel, an exhaust assembly, a second flow channel, and a transition flow channel. The flow cross-sectional area of the second flow channel is smaller than that of the coating cavity, thereby increasing the fluid flow resistance. The transition flow channel is of an arc-shaped design, wherein an included angle between a tangent line of the transition flow channel and the vertical direction gradually increases, thereby optimizing a gas discharge path. Furthermore, the system integrates a human-machine interaction unit, a control unit, a first pressure sensor and a second pressure sensor. When the value measured by the second pressure sensor is greater than 0 bar, the exhaust assembly is closed, so as to enter a pressure-maintaining filling stage until the coating is completed.

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