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FAQ

Shrink packaging common problems and solutions

In the process of shrinking packaging, often encounter some problems such as contraction of the membrane bilge gas, atomization, fisheye problems. Set to fix these problems can be adjusted through the machine, the most often adjust the temperature of the packing machine, wind circulation wind speed, speed of conveyor belt, the number of air holes and shrinkage film size.

  • Shrink film flatulence: Hot air is retained in the shrinkable film

    Solutions:

    1. to increase ventilation hole number, to accelerate the air leak from the shrink film
    2. Conveyor speed --to slow down the packaging machine, so that the hot air has a longer time from shrink leaking

    3. adjustable high machine temperatures to help the air leak from the film.

     
  • Atomization: Shrink film surface become blurred, like a mist.

    Solutions:

    1. Reduce the machine temperature, the temperature is too high so cause shrinkage film atomization
    2. Increase Conveyor speed of shrink tunnel, reduce the time of contact heating

     
  • The sealing line is weak: Sealing line shrinkage film is easy to damage or the emergence of small holes

    Solutions:

    1. Turn down the temperature of sealing machine knife
    2. The sealing line height is wrong. The line should posited in the middle of the product.
    3. The pressure of the sealing mouth frame is not right, should adjust the horizontal position of the frame.
    4. The heating knife and the sealing base may dirty, should clear the two parts
    5. The sealing base insulation rubber pad or thermal insulation adhesive damage, change them
    6. The sealing time is short, The pressure of for the
    sealing line is disappear when the sealing line combine, so longer the sealing time.

     
  • Fisheye problem: Shrink film surface appears fisheye like wrinkles

    Solutions:

    1. The temperature of the shrink tunnel is low, turn up the temperature.
    2. The speed of the conveyor is too fast, turn down the speed

     
  • Fine wrinkles: Corner and edge series of wrinkles in the contraction film

    Solutions:

    1. There are too many holes on the film, so the air on the film goes too fast, so the film can’t shrink enough, reduce the less holes.
    2. The speed of the conveyor is fast, so reduce the speed.
    3. The temperature of the shrink tunnel is too low, turn up the temperature. 
    4. The circulating wind of shrink packaging machine is too low, can make the circulating wind up.
     
  • Dog ear :Shrink film in packaging angle triangle protrusion.

    Solutions:

    1. The plastic bag may big, cut the bag small.
    2. The speed of the conveyor is too fast, turn down the speed.
    3. The circulation wind is too big, reduce the wind
    4. The temperature of the shrink tunnel is too slow, you can turn up the temperature.
     
  • The sealing position error: The position of the sealing line halfway to the packing height

    Solutions:

    1. The height of the sealing conveyor is wrong; adjust the height to suitable position.
    2. The height of the sealing frame is wrong. Adjust the height to suitable position.
    3. The circulation wind direction is wrong, adjust the wind direction
    4. The sizes of the bag is too big, make the bag small
     
  • Crush packaging:  shrink film pressure to broke the products

    Solutions:

    1. The temperature of the shrink tunnel is too high, turn down the temperature.
    2. The speed of the conveyor is too slow, increase the speed
    3. The plastic film is too small, make the bag big
    4. The shrinkage ratio of film is too big to the product, change the low shrinkage ratio film.
     
  • Pull shaped holes: Shrink film surface holes 

    Solutions:

    1. The perforating device makes the film torn, change the device.
    2. Add the holes on the film.
     
     
  • The filiform sealing position: The sealing position appears filaments

    Solutions:

    1. The temperature of the sealing knife is too low, adjust the high temperature
    2. The sealing time is too short.
     

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