Plastic sheet hot-pressing processing and forming equipment and hot-pressing processing and forming technology

Abstract

The invention discloses plastic sheet hot-pressing molding equipment. The plastic sheet hot-pressing molding equipment comprises a heating mechanism, a pressing molding mechanism, a punching shear mechanism and a hauling mechanism, wherein the heating mechanism is also provided with an upper clamping frame and a lower clamping frame, wherein the upper clamping frame and the lower clamping frame are formed by metal frame strips which are intersected in a criss-cross manner to form mesh shapes with a plurality of mesh holes, the metal frame strips of the upper clamping frame and the lower clamping frame are hollow to form cooling channels for passing of fluid; the heating mechanism is also provided with a vertical driving mechanism used for driving the upper clamping frame and the lower clamping frame to move relatively; a heating block and a clamping surface are separated by a certain vertical distance; the horizontal positions of the metal frame strips in the heating mechanism are corresponding to and are matched with the horizontal positions of the smooth parts at the periphery of a concave cavity in a mold. The invention also provides a plastic sheet hot-pressing molding process. According to the equipment and the method, the scalding of plastic sheets in the heating process can be avoided, and meanwhile, the irregular stretching deformation degree of patterns of the plastic sheets can be alleviated, so that the irregular stretching deformation degree of the patterns of the plastic sheets can be relatively slight.

Description

technical field [0001] The invention belongs to the technical field of production equipment for plastic packaging products, and in particular relates to a hot pressing forming equipment and a hot pressing forming process for hot pressing plastic sheets into plastic packaging products. Background technique [0002] Plastic sheets (including rolls of plastic sheets after unrolling) can be processed into plastic container products, such as cups for jelly and jelly foods, etc., through thermoforming. The equipment for implementing the above processing process is plastic sheet thermoforming equipment. [0003] Plastic sheet hot pressing processing and forming equipment includes a traction mechanism, a heating mechanism, a pressing and forming mechanism, and a punching and shearing mechanism; the pressing and forming mechanism is equipped with a mold, and several cavities are formed in the mold, and each cavity is distributed into M horizontal rows and N vertical rows. (M and N a...

AI Technical Summary

Problems solved by technology

The above-mentioned heating method has the following disadvantages: 1. When the required heating temperature is high or the heat resistance of the plastic material is poor, the plastic sheet is easily burned or severely scalded by the heating block, and the plastic that is close to the molten state is easy to stick to the heating 2. When the aspect ratio of the product reaches about 1.2:1 or even greater, it means that the concave part of the plastic container has a large stretching ratio, which requires that the plastic in this part has a large thickness and weight when it is not pressed, and High softening degree and high heating temperature are required, so that after heating, the parts of plastic sheet with high softening degree and heavy weight are prone to irregular stretching and deformation due to drooling (center drop), especially when the plastic sheet is pulled During the process, it is more likely that irregular horizontal stretching and deformation will occur due to the transmission of horizontal traction. regular deformation

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