Why Premade Pouch Packaging Machines Cause Seal Wrinkles – and How to Solve Them

Why Seal Wrinkles Are a Problem

1. Unattractive appearance – Wrinkled seals make the product look unprofessional, affecting brand image and shelf appeal.

2. Air leakage – Wrinkles can create small gaps or air bubbles that reduce the effectiveness of the seal.

3. Reduced shelf life – Weak seals allow oxygen or moisture to enter, accelerating spoilage or quality degradation.

Top 6 Causes of Seal Wrinkles and How to Fix Them

1. Sealing temperature is too high
Excessive heat can distort or over-melt the pouch film, especially if components like the heating tube, thermocouple, or temperature controller are malfunctioning.

Solution:
Check all sealing temperature components and adjust settings according to the pouch material's heat resistance.

2. Damaged insulation cloth (Teflon tape)
Over time, the insulation cloth on the sealing jaws can become brittle, peel, or accumulate adhesive buildup, causing uneven sealing pressure.

Solution:
Regularly inspect and replace the insulation cloth to ensure uniform sealing surface pressure.

3. Machine settings not properly adjusted
If the pouch clamps are too tight or too loose, or if they are not aligned correctly, the pouch cannot be held flat, leading to wrinkles during sealing.

Solution:
Recalibrate the clamping width and ensure the bag is held straight and flat before sealing.

4. Inconsistent pouch film material or thickness
Inferior or irregular film thickness can cause uneven heat distribution. Some materials also retain too much heat in the inner layer, leading to deformation.

Solution:
Use high-quality laminated films with consistent thickness and proper heat resistance properties.

5. Pouch is overfilled
When the product fills the pouch too close to the seal area, there is insufficient space for a clean seal, causing material to bulge during sealing.

Solution:
Ensure that the product fill level leaves at least 3–4 cm of space between the product and the top seal area.

6. Pouch mouth is not fully stretched before sealing
If the machine's pouch grippers do not properly stretch and align the pouch before sealing, the folds may be sealed directly into the pouch.

Solution:
Ensure pre-sealing alignment systems are working correctly and that the pouch is fully stretched before entering the sealing station.

Conclusion

Seal wrinkles in premade pouch packaging machines are a common but preventable issue. With proper maintenance, machine calibration, and material selection, you can significantly improve seal quality, product appearance, and customer satisfaction. For manufacturers facing recurring sealing problems, identifying the root cause early can help avoid product waste and customer complaints.

If you need support or guidance on optimizing your pouch sealing process, feel free to contact our technical team.

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