| 摘要 |
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). The production line (L) extends in a direction parallel to the direction (A) and comprises, in succession, a first sealing station ( 50 ) for making the first longitudinal seal (SL) to form the tube ( 2 ) so that it extends in the horizontal direction (A); a second tube ( 2 ) sealing station ( 9 ) for making a succession of transversal seals (ST) on the tube ( 2 ) transversally to the horizontal direction (A); a cutting station ( 10 ) for cutting the tube ( 2 ) at the transversal seals (ST) so as to create a succession of filter bags ( 1 ) in the process of being formed, each having a sealed bottom end and an unsealed end ( 7 ); a station ( 11 ) for opening the unsealed end ( 7 ) of each filter bag ( 1 ); a station ( 12 ) for dosing the infusion product (P), where a dose of the product (P) is inserted into the filter bag ( 1 ) through the unsealed opened end ( 7 ); and a third sealing station ( 13 ) for making a seal (SC) that closes the end ( 7 ) of each filter bag ( 1 ) that is still open; the closing seal (SC) extending in a direction transversal to the aforementioned longitudinal seal (SL) and to the aforementioned transversal seal (ST).
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