What does a bag closing machine do?
Products such as flour, bran, feed, sugar and grain are closed by sewing the bag mouth after filling. A bag closing machine does this with a chain stitch: a single thread is looped through itself to form a strong seam along the bag mouth. A chain stitch is fast to sew and, when needed, can easily be unpicked by pulling the thread end.
Portable and line types
- Portable (hand-held) machines: the operator holds the machine and runs it along the bag mouth. Ideal for small and medium filling points, warehouses and flexible use.
- Line (column) machines: a fixed sewing head closes bags as they arrive on a conveyor. Preferred on high-capacity packing lines.
What to consider when choosing
- Bag material: woven PP, paper, jute or cotton bags can need different needles and threads.
- Bags per day: as capacity grows, a line system pays off.
- Spare parts: easy access to wearing parts — needle, looper, knife and gears — shortens downtime.
Maintenance tips
- Lubricate regularly with the oil the maker recommends; running dry quickly wears gears and shafts.
- Clean off flour dust at the end of every shift; dust mixed with oil builds up like paste.
- Replace a broken or bent needle at once; skipped stitches usually come from the needle.
- Check the knife; a dull knife does not cut the thread cleanly.
We supply bag closing machines, threads, needles and spare parts from a single source.
