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Why do we exhaust air from blow moulded products?

Views: 2     Author: Huan Machinery     Publish Time: 2021-05-06      Origin: Huan Machinery

Why do we exhaust air from blow moulded products?


When the blow molding machine is working, the liquid plastic is sprayed out, and then the wind blown by the machine is used to blow the plastic body to a certain shape of the mold cavity to make products of different shapes, and the gas in the blow molding product must be discharged .

220L drum blow machine

When manufacturing containers with the same solvent volume, the amount of gas discharged from the blow mold is much larger than that of the injection mold, so the volume of gas discharged from the blow mold is equal to the amount of melt injected into the cavity. For blow molds, the volume of air to be discharged is equal to the cavity solvent minus the volume of the parison after it has been inflated at the moment of complete film bonding. There will still be some air trapped in the parison between the mold cavities.

hdpe blow molding machine

Exhausting the air in the blow-molded product can effectively prevent the food from spoiling and spoiling. The plastic bottle blowing machine adopts packaging materials with excellent barrier properties and strict sealing technology and requirements, which can effectively prevent the exchange of packaging contents, which can avoid food weight loss and taste loss, and can prevent secondary pollution and discharge gas plastic Blow-molded products avoid the rupture of the packaging container caused by gas expansion.



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