Abstract: A machine (100) for making filter bags (1) of tetrahedral shape for infusion products (P) comprises a production line (L) defined by a series of operating stations (50, 9, 10, 14, 11, 12, 13) where filter bags (1) made from a continuous flattened tube (2) of filter paper are formed, filled with respective doses of infusion product (P) and subjected to successive cuts and closing seals (SL, ST, SC).

Abstract: A machine which makes filter bags from flat tubular envelopes for products to be infused includes a thread applying station having a first drum rotating in a defined direction and a plurality of seats to position and pick up of seals, continuous thread and pick-up tabs fed from feed units located downstream of one another relative to the rotation direction of the first drum. The seal and pick-up tab feed units are supplied with continuous webs fed towards relative cutting elements, which cut the webs into individual seals and individual pick-up tabs. Two feed units each include a corresponding transfer element operating between a corresponding cutting element and the first drum and pick up individual seals and pick-up tabs in a first zone at the cutting elements and transfer them to a second zone separated from the first zone by a given angle and at a seat on the drum.

Abstract: A machine for making filter bags for products for infusion, made starting with a flat tubular envelope comprises a station for application of a thread with seal and pick-up tab to the tubular envelope, the station comprising a first drum which rotates in a defined direction of rotation, having a plurality of seats for the positioning and pick up of the seals, continuous thread and pick-up tabs fed from three feed units, located downstream of one another relative to the direction of rotation of the first drum; the seal and pick-up tab feed units are supplied with continuous webs which are fed towards relative cutting elements, which cut the webs into individual seals and, respectively, individual pick-up tabs; the two feed units comprise corresponding transfer means, operating between the corresponding cutting element and the first drum, picking up the individual seals and individual pick-up tabs in a first zone at the cutting elements and transferring them to a second zone separated from the first zone by a g

Abstract: The packaging apparatus for bags containing products for infusion envisages a plurality of stations located one after another along a feed line and used first to continuously cut successive individual pieces of fabric from a continuous strip of fabric, then to transform the piece of fabric from its flat configuration to a bag configuration, tubular in shape and with an open top which forms the mouth and into which a dose of product is inserted; the tubular bag is then moved to stations which cut the excess part of the mouth to size and close the mouth by tying it with a continuous thread, so as to form a closed bag, containing a single dose of product and having a projecting upper portion of thread; finally, a label is attached to the thread on each bag and the label is inserted in the bag tying zone.