How to Prevent Film Jamming in Automatic Sachet Machines

Film jamming is one of the most common causes of downtime on automatic sachet machines. Most jams share the same root causes, and most can be prevented with simple checks. Here is the practical troubleshooting guide from Link Machinery’s service team. These checks apply to any automatic packing machine running flexible film.

1. Control Film Tension

Too much tension stretches the film and causes registration drift; too little creates wrinkles and misalignment at the forming tube. Set the film dancer and brake according to the manual, and re-check when changing to a new film roll or material.

2. Check Roll Alignment and Splices

A misaligned film roll walks sideways and jams at the forming collar. Mount the roll squarely, and never use a splice with bulky tape — splices must be thin, straight and positioned cleanly as they pass the forming tube.

3. Set Sealing Temperature Correctly

Overheating melts film onto the sealing jaws; underheating leaves sticky, half-sealed film that wraps around the jaw. Confirm the correct temperature for your film grade and re-verify after material changes.

4. Keep the Forming Tube Clean

Dust, static and product residue on the forming tube increase friction and cause sticking. Wipe the tube regularly and use a static eliminator in dry climates.

5. Routine Maintenance

Lubricate the sealing jaw guides, inspect the cutter blades and check the film-path rollers for wear. A 15-minute daily inspection prevents most jams before they stop the line.

If a Jam Occurs

Stop the machine, isolate power, open the guards and carefully remove the jammed film — never pull film while the jaws are hot. Inspect the cause, correct it, and restart with a short test run.

Follow these steps and your Link automatic sachet machine will run long, jam-free shifts.