Why Does a Hot Cutting Bag Making Machine Keep Sticking to the Blade?

Causes and Practical Solutions

Blade sticking is one of the most common problems in hot cutting bag making machine. 
Many operators experience issues such as melted film sticking to the knife, poor cutting quality, or frequent machine stoppage.

1. Incorrect Temperature Setting

Excessive knife temperature causes plastic to over-melt and stick to the blade. 
Adjust temperature based on film thickness, material type, and production speed.

2. Timing Mismatch Between Knife and Clamping Plate

The hot knife should cut first, and the clamping plate should pull the bag slightly after cutting.
Incorrect timing leads to blade sticking or bag tearing.

3. Unsuitable Raw Material or High Recycled Content

Materials with high melt flow or excessive recycled content soften easily and stick to hot surfaces.
Control recycled ratio and improve material mixing.

4. Blade Contamination and Poor Maintenance

Carbonized plastic residue on the blade increases friction and sticking.
Clean the blade regularly and replace worn knives.

5. Production Speed Too High

Excessive speed may not allow proper cutting and separation.
Balance speed, temperature, and material properties.

Conclusion

Blade sticking is usually caused by process settings rather than the blade itself.
Optimizing temperature, timing, material selection, and maintenance can significantly improve production stability.