shrink sleeve common problems and their solutions

Root cause:

• Uneven heat or adequate heat.
• Uneven material shrinkage due to type of plastic, decorative inks, coating, embossing or finishes on shrink labels.

Solutions:

• Increase the tunnel temperature or airflow to increase the degree of shrink.
• More complex issues require a custom designed solution to optimized the application of heat to the part.

Root cause:

• Tapered bottle design.
• Too much heat at the top of the bottle.

Solutions:

• Tack label at the lock point of the bottle before entering the shrink tunnel.
• Adjust the heat flow from top area.

Root cause:

• Uneven or inefficient application of heat.
• Uneven material shrinkage due to type of plastic, decorative ink, coating and complex bottle shape.

Solutions:

• Adjust the heat flow up or down to get a more uniform application of heat.
• Adjust the tunnel temperature according to type of shrink.

Root cause:

• Give the heat for long time.
• emperature is more according to material.
• More complex shape bottle design.

Root cause:

• Bad seals are probably common in shrink wrap.
• Sometimes it is less sealed or open.

Solutions:

• Use proper glue to seal the shrink sleeve according to material.
• Sometimes it is unevenness of shrink material.
• Sometimes it is without perforation or pin holes.

Root cause:

• It is due to uneven cutting of shrink sleeve.

Solutions:

• Make sure cutter is ok or cutting speed is uneven.
• Film is not uneven in thickness.

Root cause:

• Shrink film exposed to hot air after sealing.
• Complex shape of container.

Solutions:

• Pin hole is used or perforation is used

Root cause:

• Unevenness of shrinking
• More distortion of film.

Solutions:

• Check distortion of design first and conveyor speed also.
• Check shelf life of shrink film, each shrink film has its own life for use.
• Check if chain temperature is too high.