Plastic bag heat sealing machine

Abstract

The invention discloses a plastic bag heat sealing machine, which comprises a base and a lens. A heat seal base is arranged above the base; a heat seal cutter is slidably connected into the heat seal base, and comprises a cutter body and a cutter bit; a permanent magnet is arranged on the cutter body; an installation hole is further formed in the side wall of the cutter body; a light source is arranged at the installation hole part; an obliquely formed light transmission hole is further formed in the cutter body; the center of the light source is located on a central axis of the light transmission hole; an electromagnetic block repulsive to the permanent magnet is further arranged on the heat seal base; a magnet exciting coil is sleeved on the electromagnetic block; a plurality of optoelectronic switches are further arranged on the heat seal base, and are electrically connected with resistances with different resistance values; the resistance values of the resistances corresponding to the optoelectronic switches are increased along with the increase of the distances between the optoelectronic switches and the heat seal base; and the resistances are connected in parallel so as to be electrically connected with the magnet exciting coil. According to the scheme provided by the invention, when plastic bags with different thicknesses are heat-sealed, heat sealing pressure acted on the plastic bags can be automatically adjusted.

Description

technical field [0001] The invention relates to a plastic bag processing machine. 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. [0003] When heat-sealing plastic bags, the heat-sealing temperature, heat-sealing pressure, heat-sealing speed and cooling conditions all have an important influence on the heat-sealing effect of the final plastic bag. [0004] The heat-sealing pressure is that at the heat-sealing temperature, the heat-...

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Problems solved by technology

[0005] 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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