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    Home > Active Ingredient News > Drugs Articles > Common problems and solutions of continuous automatic sealing machine

    Common problems and solutions of continuous automatic sealing machine

    • Last Update: 2019-02-21
    • Source: Internet
    • Author: User
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    The general sealing machine of continuous automatic sealing machine is composed of frame, speed control and transmission mechanism, sealing and printing mechanism, conveying device, electrical and electronic control system, etc After the equipment is powered on, all mechanisms start to work After the electric heating element is powered on, it will heat up the upper and lower heating blocks rapidly, and adjust them to the required temperature through the temperature control system The impression wheel will rotate, and the cooling system will start to cool down as required The conveyor belt will rotate, and the speed control device will adjust it to the required speed   When the package containing articles is placed on the conveyor belt, the sealing part of the bag is automatically sent between the two sealing belts in operation, and brought into the heating area The heat of the heating block is transmitted to the sealing part of the bag through the sealing belt, so that the film is heated and melted, and then through the cooling area, the surface temperature of the thin film is properly reduced, and then it is rolled by the knurled wheel (or the printing wheel) to make the sealing part The upper and lower plastic films are pasted and pressed to form a network pattern (or printed logo), and then the sealed packaging bags are sent out of the machine by the guide rubber belt and the conveyor belt to complete the sealing operation Loose sealing is one of the common faults of continuous sealing machine There are three meanings of loose sealing: ① the sealing part of packaging bag cannot be sealed The main causes of the failure are as follows (1) when the heat sealing temperature is not enough, the heat sealing temperature of the compound bag with OPP as the lining should reach 170-180 ℃ when the total thickness of the bag is 80-90 μ m; when the total thickness of the compound bag with PE as the lining is 85-100 μ m, the temperature should be controlled at 180-200 ℃ As long as the total thickness of the bag is increased, the heat sealing temperature must be increased accordingly (2) the speed of heat sealing is too fast, and it is also related to the speed of sealing machine If the speed is too fast, and the sealing part is not heated yet, it will be sent to the cold pressing part by the traction roller for cooling treatment, which naturally fails to meet the quality requirements of the heat sealing (3) the pressure of the cold pressing rubber wheel is not suitable There is one above and one below the cold pressing rubber wheel The pressure between them should be moderate When adjusting the pressure, just clamp the spring (4) there is a problem with the quality of the heat sealing film If the corona treatment of the composite lining is not uniform and the effect is not good, and it happens to be at the sealing place, it will not be able to seal This kind of situation is very rare, but once it appears, the product will inevitably be scrapped Therefore, in the color printing and packaging industry, it is the next process to supervise the previous process Once quality problems are found, the causes must be analyzed and solved in time If there is moisture and dirt in the sealing place, it will also cause the sealing not firm In a word, to solve the problem of unfixed sealing, the temperature of heat sealing can be increased properly, the speed of heat sealing can be reduced, and the pressure of cold pressing rubber wheel can be increased at the same time (2) under the pressure of knife sealing, although the bag mouth is sealed, it is slightly squeezed or peeled, and the seal is cracked again The causes of the second sealing failure are as follows (1) if the heat sealing temperature is not enough, the problem can be solved by properly increasing the heat sealing temperature (2) the knife surface of the heat sealing knife is not smooth enough The heat sealing knife is divided into two parts, upper and lower Generally, the thermoelectric coupling is installed in it to sense the transmission of temperature There are three screws on the heat sealing knife The middle screw supports and strengthens the knife The other two screws are equipped with pressure spring and gasket, which are mainly used to adjust the pressure of the heat sealing knife The upper and lower blades have two springs respectively The main reason for the unevenness of the knife face of the heat sealing knife is that the middle screw is inclined, not horizontal; or the pressure of the pressure spring of the upper heat sealing knife is uneven Sealing machine is a kind of heat sealing equipment suitable for small enterprises and families Usually use 220V AC power supply, heating power is hundreds of watts The circuit of sealing machine produced by various manufacturers is similar and slightly different Taking fr-200 sealing machine as an example, the working principle and maintenance example of the circuit are analyzed ③ during the peeling test on the sealing part, half of the sealing is firm and half of the sealing is separated, so the sealing quality of the packaging bag is still unqualified, because the contents are easy to be missed during the storage and transportation process This situation often occurs when the composite lining is OPP and blow molded PE Maintenance example: the common failure causes of the machine are the burning of the transformer, the damage of the thyristor, the rupture of the heating strip, etc Example 1: press down the handle, switch K is closed, RL is electrified and heated continuously, and Z finally heats and fuses the plastic bag sealing part; when repairing, weld down the thyristor, and measure it with a multimeter, and it is found that there is breakdown between T1 and T2 poles It can be repaired after replacement of SCR Select 3A / 600V thyristor, such as tlc336a Example 2: BL cannot heat the seal after pressing the handle After opening the shell, it was found that the transformer was burnt out and the primary coil of the measuring transformer was broken At this time, the secondary voltage can be about 25V and the power can be replaced by the same transformer The transformer of this unit is in intermittent power operation, so its power capacity is about 350W If the temperature is too high or the continuous use time is too long, the transformer may be damaged, which should be noted in use Example 3: after pressing the handle, the heating temperature cannot be adjusted when the handle is electrified and heated During maintenance, the potentiometer VR is mainly inspected Because VR is often rotated, the carbon diaphragm of VR is damaged Replace it with a new VR The above is today to share with you about the continuous automatic sealing machine common problems and solutions of all the content, I hope to help you.
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