Multipoint nitrogen charging injection molding technology

Abstract

The invention discloses a multi-point nitrogen-filled injection molding process, which comprises the following steps: (1) making the plastic melt enter the mold cavity from the mold gate in the mold clamping state; (2) filling the mold cavity with the plastic melt When the cavity reaches 75% to 95% volume, the inert gas enters the molten plastic melt through the inlet of the air channel, and pushes the unsolidified plastic melt in the center into the mold cavity that has not yet been filled; (3) the inert gas in the plastic melt Form an air passage; (4) Under the pressure-holding state, the inert gas in the air passage compresses the plastic melt, replenishes the material to ensure the appearance of the part is complete, and continues to maintain pressure until the plastic melt cools down; (5) The plastic melt is cooled and formed Finally, the inert gas in the airway is exhausted to obtain plastic products. The invention solves the problem that the traditional injection molding process of plastic products is prone to produce inconsistent wall thickness shrinkage, uneven stress, easy deformation and warping of plastic parts, low precision, unsatisfactory appearance and color of products, and the solid injection molding process has high requirements for mold equipment and is expensive. material problem.

Description

technical field [0001] The invention relates to the field of mold injection molding technology for plastic products, in particular to a multi-point nitrogen-filled injection molding technology. Background technique [0002] Plastic products are inseparable in people's production and life. This supply-demand relationship also promotes the rapid development of the injection molding industry. Focusing on the scarcity of oil in the future, cost control is a must for businesses. Since injection molding products are widely used in various industries, the requirement for the precision of plastic parts has also become a difficult problem in the industry. Traditional plastic injection molding is to inject molten plastic into the mold cavity through high-pressure mechanical energy, but the stress generated during injection, pressure holding, cooling, and shrinkage is different from the shrinkage of the wall thickness of the plastic part, causing the plastic part to deform and warp. I...

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Problems solved by technology

[0006] The invention aims to solve the problem that the traditional plastic product injection molding process is prone to produce inconsistent wall thickness shrinkage, uneven stress, easy deformation and warping of plastic parts, low precision, unsatisfactory appearance and color of the product, and the solid injection molding process has high requirements for mold equipment and is expensive. To solve the problem of materials, provide a multi-point nitrogen-filled injection molding process that can realize hollow injection molding of plastic products, make the wall thickness of plastic parts shrink uniformly, high precision of plastic products, full appearance color, save material and mold

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