Operating rules and fault analysis of sealing machine-Quanzhou hot melt adhesive sealing machine is hand-pushed.

Operating rules and fault analysis of sealing machine-Quanzhou hot melt adhesive sealing machine is hand-pushed.

operating instruction

　　First, the process operation method

　　1. Press the "ON" button, the power indicator light and "COOLER" (cooling indicator light) light up, and the warning light flashes.

　　2. Press the "START" button, the warning light will go out, the "Start" indicator light will be on, and the power will achieve the preset setting.

　　3. Turn on the power supply of the conveyor belt, run the conveyor belt, and adjust the speed knob to a proper position.

　　4. Push in the container to be sealed and start normal operation.

　　5. If overcurrent occurs during operation, the "FAULT" light on the control panel lights up and the warning light flashes. Press the "RESET" button at this time, and then press the "START" button again after the overcurrent light goes out. -Quanzhou hot melt adhesive sealing machine hand push type

　　6. When the work is finished, press the "STOP" key, and the machine will return to the 1 state.

　　7. Press the "OFF" key to turn off the machine and exit the standby state.

　　Second, the operation process matters needing attention and daily maintenance

　　1. This machine uses 220V single-phase three-wire power supply, so the grounding must be reliable, otherwise personal safety will be affected.

　　2. Metal parts should not be close to the induction head.

　　3, often check the cooling water level, general frequent use, check once a week, and add cooling water. It is best to use non-conductive cooling water.

　　4, often check the pipeline, joint can't have water leakage, water seepage phenomenon. In order to prevent the pipeline from freezing due to low temperature, antifreeze should be injected into the water tank.

　　5, maintenance should follow the operating sequence.

　　6, maintenance should be fixed professionals.

　　7, after the boot is not allowed to open the chassis, inspection and maintenance must cut off the total power supply.

　　8. The machine is designed with overload and overheating protection system. When the temperature of the radiator plate exceeds 70 degrees, the high voltage will be cut off, and the warning light will flash: when the load is too large (that is, the diameter of the heated bottle caps is too large or closely arranged or too close to the induction head), the high voltage current of the machine will be temporarily overloaded (the digital display instantly exceeds "100"), which can also be protected. This is a normal phenomenon, and you can press the "START" key again to start.

　　Cleaning and maintenance

　　Regularly clean the machine surface, bottom plate, lower die slide plate, groove, upper die inner pressure plate and positioning rod (note: the power supply must be turned off and the room temperature must be restored).

　　Grease the lower die slide plate, pressure bar bearing, eccentric wheel, guide post, guide rail and other transmission parts regularly to ensure the performance of the machine.

　　Method of cleaning the toothed cutter: firstly, plug the two drainage holes of the lower die with cotton balls, pour boiling water into the groove of the lower die until it is full, then push the sliding plate of the lower die into place, press the upper die down to the lowest point, and let the toothed cutter soak for several minutes until it is clean, and repeat several times. -Quanzhou hot melt adhesive sealing machine hand push type

　　heat seal

　　Heat sealing bag making is widely used in the fields of daily chemical product packaging, food and drug packaging and so on. Because the heat sealing part of the packaging bag is most prone to leak when the product is filled, and most of the damage of the packaging bag occurs in the heat sealing part in actual use, selecting appropriate heat sealing materials and heat sealing parameters can reduce the rejection rate of the production line and effectively improve the overall barrier performance of the packaging.

　　Hot-pressing sealing is to heat the sealing material in a certain way to make it reach a viscous state, and then press it to make it stick. Generally, it is done by hot-pressing sealing device or hot-pressing sealing machine. The heat sealing head is the actuator of hot sealing. According to the different structure and heating methods of the heat sealing head, the methods of hot sealing can be divided into common hot sealing method, fuse sealing, pulse sealing, ultrasonic sealing, high frequency sealing and induction sealing. Different heat sealing methods are suitable for different film characteristics. For example, ultrasonic sealing and high-frequency heat sealing are more suitable for films that are easily deformed by heat. However, the most commonly used heat sealing method is ordinary hot pressing. There are several common hot-pressing sealing methods, such as flat heat sealing, disc heat sealing, belt heat sealing and sliding clamp sealing, and flat heat sealing is the most popular.

　　Fault analysis

　　The seal is not firm

　　Loose sealing is one of the common faults of continuous sealing machine, which has three meanings: ① the sealing place of packaging bag cannot be sealed; (2) Under the pressure of sealing knife, although the bag mouth is sealed, the seal will crack again if it is squeezed or peeled off slightly; (3) When peeling test was carried out on the sealing part, half of the sealing parts were firmly sealed and half of them were separated, so the sealing quality of the packaging bag was still unqualified, because the contents were easily missed by extrusion during storage and transportation. This situation often occurs when the composite lining is OPP or blow-molded PE.

　　The reasons for the first type of failure are mainly as follows.

　　(1) the heat sealing temperature is not enough

　　Usually, when the total thickness of the composite bag with OPP as lining is 80 ~ 90μ m, the heat sealing temperature should reach 170 ~ 180℃. When the total thickness of composite bag with PE as lining is 85 ~ 100μ m, the temperature should be controlled at 180 ~ 200℃. As long as the total thickness of bags is increased, the heat sealing temperature must be increased accordingly.

　　(2) The heat sealing speed is too fast

　　Whether it is easy to seal is also related to the speed of the sealing machine. If the speed is too fast, the sealing part will be transported to the cold pressing part for cooling treatment before it is heated, which naturally fails to meet the quality requirements of heat sealing. -Quanzhou hot melt adhesive sealing machine hand push type

　　(3) The pressure of cold-pressed rubber tire is not appropriate

　　There is one cold-pressed rubber tire above and below, and the pressure between them should be moderate. When adjusting the pressure, just clamp the spring.

　　(4) There is something wrong with the quality of the heat-sealed film.

　　Failure to seal the seal is also related to the quality of the heat-sealed film. If the corona treatment of the composite lining is uneven and the effect is not good, and it happens to appear at the seal, it will definitely not be sealed. This situation is rare, but once it appears, the product will be scrapped. Therefore, in the color printing and packaging industry, it is the next working procedure that supervises the last working procedure. As soon as quality problems are discovered, the causes must be analyzed and solved in time. If there is moisture and dirt at the seal, it will also cause the seal to be unstable.

　　In a word, to solve the first problem of weak sealing, we can generally increase the heat sealing temperature appropriately, then reduce the heat sealing speed, and at the same time increase the pressure of the cold pressing rubber tire.

　　The main reasons leading to the second type of sealing failure are as follows.

　　(1) the heat sealing temperature is not enough

　　The problem can be solved by properly increasing the heat sealing temperature.

　　(2) The blade surface of the heat sealing knife is not flat enough.

　　The heat sealing knife is divided into an upper piece and a lower piece, and usually a thermocouple is installed in it to sense the temperature transfer. There are three screws on the heat sealing knife, the middle screw plays the role of supporting and strengthening the blade, and the other two screws are equipped with pressure springs and gaskets, 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 uneven surface of the heat sealing knife is that the middle screw is installed obliquely, not horizontally; Or the pressure of the pressure spring of the upper heat sealing knife is uneven.

　　Maintenance information

　　Sealing machine is a kind of heat sealing equipment suitable for small enterprises and families. Usually, 220V AC power supply is used, and the heating power is several hundred watts. The circuits of sealing machines produced by various manufacturers are similar. Taking FR-200 sealing machine as an example, the working principle and maintenance examples of its circuits are analyzed.

　　Circuit principle

　　See the attached figure for the circuit. The nominal heating power of this machine is 350W, and the maximum sealing length is 200mm. It has an operating handle, which has two functions: one is to press the plastic bag to be sealed on the heating strip after pressing the operating handle, and the other is to press the power switch K to close it. When the switch K is closed, the AC power is stepped down by R1 and R2, rectified by diode D1, and filtered by capacitor C1 to provide working power for this machine. This power supply charges C2 via R4 and VR. At the initial stage of charging, the voltage on C2 is very small, the transistor Q is turned off, and its collector is at a high level. Through the resistor R6 and the LED, the bidirectional thyristor SCR is triggered, and the transformer T is electrified. The second is to supply power to the heating element RL, and the plastic bag pressed on RL is heated and sealed. When the transistor Q is turned on due to C2 charging, and the collector voltage is not enough to trigger the SCR, RL stops heating, lifts the handle, takes out the plastic bag, and the sealing is completed. When the handle is lifted and the switch K is turned off, C2 will discharge rapidly through D2 and R3, so as to prepare for the first charge. Light-emitting tube LED is used to indicate when RL is powered on. Adjusting the potentiometer VR can change the length of each sealing overtime, and the specific adjustment range can be determined according to the power supply voltage at work and the thickness test of the sealed plastic. -Quanzhou hot melt adhesive sealing machine hand push type

　　Maintenance example

　　The common fault causes of this machine are transformer burning, thyristor damage, heating bar fracture and so on. Example 1: When the handle is pressed, the switch K is closed, and the RL is electrified and heated continuously, and finally the sealing part of the plastic bag is heated and fused; During the repair, the SCR was soldered and measured with a multimeter, and it was found that the electrode between T1 and T2 had been broken down. It can be repaired after replacing the SCR. Silicon controlled rectifier is 3A/600V, such as TLC336A. Example 2: BL cannot heat the seal after pressing the handle. Open the shell and visually find that the transformer has burned out, and the primary coil of the measuring transformer has been broken. At this time, it can be repaired by replacing it with a transformer with a secondary voltage of about 25V and the same power as the original one. The transformer works intermittently, so its power capacity is about 350W. If the temperature is too high, or the continuous use time is too long, it may lead to transformer damage, which should be paid attention to in use.