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Reasons and solutions for the poor sealing of the sealing machine
Add Time：2022-02-22 07:15:50
The sealing machine has a wide range of applications and is one of the commonly used equipment in the fast food industry such as coffee shops and milk tea shops. Sealing is the last link of product sales. The quality of sealing directly affects the leakage and quality of products, so it also plays an important role in product packaging. Then, when using the sealing machine, you must know how to deal with some common small faults, so as to ensure the production of the product. That is, the sealing machine is not firmly sealed, and there are many reasons for the poor sealing. First of all, let's talk about the common problems.
If the machine can be sealed before, but the sealing is not firm recently, it is necessary to check whether the knob of the control panel of the hand pressure sealing machine is broken, which causes such a problem. When sealing, press it hard and see if Whether the effect will be better, and whether the heating is black, if the high-temperature varnish is burned out, replace it.
Generally speaking, poor sealing is one of the common faults of continuous sealing machines. The poor sealing has three meanings: ① The sealing part of the packaging bag cannot be sealed; ② Under the pressure of the sealing knife, although the bag mouth is sealed, but with a little force Kneading or peeling, the seal will crack again; ③When the peeling test is performed on the seal, it appears that half of the seal is strong and half is separated, and the sealing quality of such a packaging bag is still unqualified.
The reasons for the formation of the first problem are mainly the following:
1. The heat sealing temperature is not good.
Under normal circumstances, when the composite bag with OPP as the lining material, when the total thickness of the bag is 80-90 μm, the heat sealing temperature should reach 170-180 °C; the total thickness of the composite bag with PE as the lining material is 85-100 μm At this time, 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 heat sealing speed is too fast.
The failure to seal the mouth is also related to the speed of the sealing machine. If the speed is too fast, the sealing part will be transported by the traction roller to the cold pressing place for cooling treatment before it can be heated, which naturally cannot meet the requirements of heat sealing quality.
3. The pressure of the cold-pressed rubber wheel is not suitable.
There are one cold pressing rubber wheel on the top and bottom, the pressure between them should be moderate, and only the tension spring can be clamped when adjusting the pressure.
4. The quality of the heat-sealing film is in doubt.
The failure to seal the seal is also related to the quality of the heat-sealing film. If the corona treatment of the composite lining is uneven, the effect is not good, and it just appears at the seal, and it must not be able to seal. This situation is rare, but once it occurs, the item must be voided. Therefore, in the color printing and packaging industry, it is the next process to supervise the previous process. Once quality problems are found, it is necessary to analyze the reasons and deal with them in time. If there is moisture or dirt on the seal, the seal will not be strong.
5. If there is moisture or dirt in the sealing part of the sealing machine, it will also cause the sealing to be weak. After clearing.
The above mentioned points for everyone hope that it will be of great help to everyone. The reasons and solutions for the sealing machine not being firmly sealed should be remembered, which can save you a lot of problems.
If the machine can be sealed before, but the sealing is not firm recently, it is necessary to check whether the knob of the control panel of the hand pressure sealing machine is broken, which causes such a problem. When sealing, press it hard and see if Whether the effect will be better, and whether the heating is black, if the high-temperature varnish is burned out, replace it.
Generally speaking, poor sealing is one of the common faults of continuous sealing machines. The poor sealing has three meanings: ① The sealing part of the packaging bag cannot be sealed; ② Under the pressure of the sealing knife, although the bag mouth is sealed, but with a little force Kneading or peeling, the seal will crack again; ③When the peeling test is performed on the seal, it appears that half of the seal is strong and half is separated, and the sealing quality of such a packaging bag is still unqualified.
The reasons for the formation of the first problem are mainly the following:
1. The heat sealing temperature is not good.
Under normal circumstances, when the composite bag with OPP as the lining material, when the total thickness of the bag is 80-90 μm, the heat sealing temperature should reach 170-180 °C; the total thickness of the composite bag with PE as the lining material is 85-100 μm At this time, 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 heat sealing speed is too fast.
The failure to seal the mouth is also related to the speed of the sealing machine. If the speed is too fast, the sealing part will be transported by the traction roller to the cold pressing place for cooling treatment before it can be heated, which naturally cannot meet the requirements of heat sealing quality.
3. The pressure of the cold-pressed rubber wheel is not suitable.
There are one cold pressing rubber wheel on the top and bottom, the pressure between them should be moderate, and only the tension spring can be clamped when adjusting the pressure.
4. The quality of the heat-sealing film is in doubt.
The failure to seal the seal is also related to the quality of the heat-sealing film. If the corona treatment of the composite lining is uneven, the effect is not good, and it just appears at the seal, and it must not be able to seal. This situation is rare, but once it occurs, the item must be voided. Therefore, in the color printing and packaging industry, it is the next process to supervise the previous process. Once quality problems are found, it is necessary to analyze the reasons and deal with them in time. If there is moisture or dirt on the seal, the seal will not be strong.
5. If there is moisture or dirt in the sealing part of the sealing machine, it will also cause the sealing to be weak. After clearing.
The above mentioned points for everyone hope that it will be of great help to everyone. The reasons and solutions for the sealing machine not being firmly sealed should be remembered, which can save you a lot of problems.
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