Common problems such as bloating, fogging, and fish eyes in packaging bags, and solutions

During the shrink wrapping process, common problems include bloating, fogging, and fish eyes in the shrink film. These problems can be corrected by adjusting the machine settings. The most common methods are adjusting the temperature, air circulation speed, conveyor belt speed, number of vents, and size of the shrink film of the packaging machine.

Shunxingyuan Packaging, a professional flexible packaging manufacturer, will explain some of the most common shrink packaging problems and solutions below.

I. Bloating

Hot air is retained inside the shrink film.

Solutions:

1. Increase the number of vents to speed up the escape of air from the shrink film

2. Reduce the speed of the packaging machine's conveyor belt to allow more time for hot air to escape from the shrink film

3. Increasing the temperature of the packaging machine helps air escape from the shrink film

II. Fogging

The surface of the shrink film becomes blurry, like a thin fog.

Solutions:

1. Lower the temperature of the packaging machine; excessive temperature is the cause of shrink film fogging

2. Increase the speed of the packaging machine's conveyor belt to reduce the time the shrink film is exposed to heat

III. Weak Seal

The seal of the shrink film is easily damaged or has small holes.

Solutions:

1. Lower the temperature of the sealing machine's heat sealing knife

2. Incorrect seal height; the seal height should be half the height of the package

3. Uneven pressure on the sealing frame; adjust the horizontal position of the sealing frame

4. The heat sealing knife or sealing base may be dirty; clean the heat sealing knife or sealing base

5. The heat insulation pad or sticker on the sealing base is damaged; replace the heat insulation pad or sticker

6. The sealing time is too short, and the sealing pressure disappears before the seal is completely bonded; lengthen the sealing time

IV. Fish Eyes

Fish-eye-like wrinkles appear on the surface of the shrink film.

Solutions:

1. The temperature of the shrink packaging machine is too low; increase the temperature of the packaging machine

2. The speed of the shrink packaging machine's conveyor belt is too fast; reduce the speed of the conveyor belt

3. The air circulation of the shrink packaging machine is too low; increase the air circulation

V. Fishtail Wrinkles

A series of wrinkles appear on the corners and edges of the shrink film.

Solutions:

1. Too many vents on the shrink film cause air to escape too quickly, preventing the shrink film from fully shrinking; reduce the number of vents

2. The speed of the shrink packaging machine's conveyor belt is too fast; reduce the speed of the conveyor belt

3. The temperature of the shrink packaging machine is too low; increase the temperature of the packaging machine

4. The air circulation of the shrink packaging machine is too low; increase the air circulation

VI. Dog Ears

The shrink film forms prominent triangles at the corners of the package.

Solutions:

1. The shrink bag wrapping the package is too large; reduce the size of the shrink bag

2. The speed of the shrink packaging machine's conveyor belt is too fast; reduce the speed of the conveyor belt

3. The air circulation of the shrink packaging machine is too low; increase the air circulation

4. The temperature of the shrink packaging machine is too low; increase the temperature of the packaging machine

VII. Incorrect Sealing Position

The seal should be located at half the height of the package.

Solutions:

1. The height of the sealing machine's conveyor belt is incorrect; adjust the conveyor belt height to the appropriate position

2. The height of the sealing frame is incorrect; adjust the sealing frame height to the appropriate position

3. The air circulation direction of the shrink packaging machine is incorrect; readjust the air circulation direction

4. The shrink bag wrapping the package is too large; reduce the size of the shrink bag

VIII. Crushed Package

The package is deformed or crushed by the shrink film.

Solutions:

1. The temperature of the shrink packaging machine is too high; lower the temperature

2. The speed of the shrink packaging machine's conveyor belt is too slow; increase the speed of the conveyor belt

3. The shrink bag wrapping the package is too small; increase the size of the shrink bag

4. The shrink film used has too much shrinkage tension and is not suitable for the package; use a shrink film with lower shrinkage tension

IX. Zipper-like Holes

Zipper-like intermittent holes appear on the surface of the shrink film.

Solutions:

1. The vent punching device tears the shrink film; check the vent punching device of the sealing machine

2. Insufficient number of vents; increase the number of vents

X. Filamentous Seal

Fine filaments appear at the sealing position.

Solutions:

1. The temperature of the sealing machine's heat sealing knife is too low; increase the temperature of the heat sealing knife

2. The sealing time is too short; lengthen the sealing time

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