Options Knotting station

Knotting on the bag

The thread is knotted securely to the top of the bag by two needle stitches to the left and right of the longitudinal seam in a patented procedure. The knot replaces the function of the staple by fixing the inner folds with two stitches and reliably closing the top of the tea bag.

Doppelkammerbeutel mit Knoten

The knot is self-tightening and therefore cannot become loose. The station works in a continuous process. The movements run slowly and the needles are protected against wear. The knotted thread is tightened at the end of the process by a thread brake. A 100% knot check is performed at this stage. Faulty bags are ejected.

Illustration shows a complete knotting station BG-D60

Illustration shows a detail of the knotting station BG-D60

llustration shows a detail of the knotting station BG-D60

Knotting on the tag

The knot is formed between two holes punched beforehand in the cardboard tags in a patented procedure. The holes are cleanly punched out by apparatus installed in the tag feed. As well as giving a neat optical impression, the holes serve to relieve wear on the needles which do not need to pierce the hard tag. The knot is formed between both holes which results in a perfect appearance.

Etikett mit Faden
The knot is self-tightening. A sensor monitors the position of the bag and the tag before reaching the knotting station. If the positions are incorrect, the knotting device swings out of its operating position for one cycle and then back in again, allowing the faulty bag to pass through without knotting. This protects the extremely precise components. A thread monitor checks whether the knots have been formed. A bag detected as being faulty is blown out by the faulty bag ejection station.

Illustration shows a complete knotting station BG-D62

Illustration shows a detail of the knotting station BG-D62

Illustration shows a punching device