Apparatus for the conditioning in envelopes of individual dual-use filter sachets in amchines for the continuous production of such filter sachets

An apparatus for making infusion packets which comprises:

• means for feeding a strip of thermally weldable filter paper along a transport path;
• means along said path for feeding successive measured quantities of an infusion product onto said strip;
• means along said path for folding said strip into a flattened tube around said infusion product and for forming transverse and longitudinal seals across and along said strip to define individual bags each containing a measured quantity of said infusion products;
• means along said path for applying labels, tabs and strings to said strip and for severing segments of said strip from one another along alternate transverse welds to form respective segments each comprising two of said bags joined by an intervening weld;
• means downstream of said path for forming in each segment a fanfold along the intervening transverse weld thereof;
• means for feeding pieces of envelop paper into registry with each of said segments;
• stationary folding means for folding the bags of each segment along said fanfold and simultaneously folding the respective piece of envelope paper to flank said bags and form an assembly of each folded segment and the respective folded piece of paper;
• a pincer wheel formed with pincers engageable with said assembly for displacing same along a trajectory;
• means along said trajectory for joining the edges of said bags of each segment remote from the respective fanfold;
• and
• means along said trajectory for folding a flap of each piece of paper over the sealed remote edges of the respective pair of bags and sealing edges of said piece of paper to close an envelope formed by said piece of paper around the respective pair of bags.