Heat sealing process of plastic packaging bag

Abstract

The invention belongs to the technical field of plastic bag processing and particularly discloses a heat sealing process of a plastic packaging bag. The plastic packaging bag is heat-sealed by a heatsealing machine. The process comprises the following steps: (1) a heating device is started and used for heating hydraulic oil in a hydraulic column; (2) the distance between an upper pressing knife and a lower pressing knife is adjusted so that the plastic packaging bag can be placed on a workbench; (3) the to-be-heat-sealed plastic packaging bag is placed on the workbench, and the to-be-heat-sealed position is aligned with a through hole; (4) a motor is started and shut down after rotating for one circle; (5) whether the heat-sealed plastic packaging bag meets requirements is checked; (6) the steps (3)-(5) are repeated when the next plastic packaging bag is heat-sealed. With the adoption of the scheme for heat sealing of the plastic packaging bag, the heat sealing pressure acting on theplastic packaging bag can be adjusted according to the thickness of the plastic packaging bag.

Description

technical field [0001] The invention belongs to the technical field of plastic bag processing, and in particular relates to a heat-sealing process for plastic packaging bags. Background technique [0002] At present, heat sealing is the most common and practical bag-making method used in composite packaging materials. It uses various external conditions (such as electric heating, high-frequency voltage or ultrasonic waves, etc.) to make the sealing position of plastic bags It becomes a viscous state when heated, and with the help of a certain pressure, the two layers of film are fused into one, and the strength is maintained after cooling. Generally speaking, a good heat sealing effect depends on whether it has good heat sealing strength and undamaged appearance. When heat-sealing plastic bags, a heat-sealing machine is required. The heat-sealing temperature, heat-sealing pressure, heat-sealing speed and cooling conditions of the heat-sealing machine have a great influence ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the heat-sealing pressure is generally provided by the pressure spring on the heat-sealing machine. At the same time, when heat-sealing, the heat-sealing pressure needs to increase with the increase of the thickness of the plastic bag. If the heat-sealing pressure is small, it is difficult for the two-layer film to be heat-bonded. At this time, it will be difficult to exhaust the air bubbles sandwiched in the middle of the welding seam. If the heat sealing pressure is too high, the molten material will be squeezed away, the welding edge will be damaged, and the root will be broken. Therefore, in the prior art, plastic bags of different thicknesses are heated. When sealing, the purpose of adjusting the heat-sealing pressure is often achieved by replacing the pressure spring. The above-mentioned method often has the following problems in actual use: 1. When processing different plastic bags, in order to meet the requirements of different heat-sealing pressures Need to replace different pressure springs artificially, which will undoubtedly greatly reduce the processing efficiency of plastic bags, and also increase the labor intensity of workers; 2. Use pressure springs to meet the heat-sealing pressure requirements during heat-sealing After the pressure spring is used for a long time, on the one hand, the elastic performance of the pressure spring is weakened, resulting in insufficient heat sealing pressure on the plastic bag, which affects the final heat sealing effect. On the other hand, the pressure spring is also prone to damage during use.

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