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AssigneeTecnomeccanica S.r.l.
InventorAndrea Romagnoli
Estimating the term…
In a machine for making filter bags for infusion products, a flattened tube (34) is used which is made from a web (17) of filter paper that: is heat-sealable by thermal reactivation of a layer of glue; is fed continuously in the horizontal position; has individual charges (19) of the infusion product placed on its top surface at suitable intervals; and, lastly, is gradually folded onto itself until its longitudinal edges (18) are juxtaposed. An apparatus (250) for sealing the tube (34) comprises an operator block (94) bearing two rows (251) of emitters (96) designed to give off a gaseous fluid heated to a suitable temperature. The operator block (94), accommodated inside the tube (34) with the emitters (96) aligned and juxtaposed with the edges (18), directs the fluid against internal faces (97) of the tube (34) directly at the layer of glue on the web (17) which is simultaneously folded around the operator block (94) itself.
An apparatus for sealing a flattened tube (34) of heat-sealable filter paper to make filter bags for infusion products, where the tube (34) is made from a web (17) of filter paper that is sealable by thermal reactivation of a layer of glue, the web (17) having individual charges (19) of the infusion product placed on its top surface at suitable intervals and being fed continuously in the horizontal position and then folded onto itself until its longitudinal edges (18) are juxtaposed, the apparatus (250) comprising at least one operator block (94) bearing at least one row (251) of emitters (96) designed to give off a gaseous fluid heated to a suitable temperature, the operator block being accommodated inside the tube (34) being formed, the row (251) of emitters (96) being aligned and juxtaposed with the longitudinal edges (18) of the web (17) of filter paper, and the emitters (96) giving off the gaseous fluid onto the faces of the inside edges (97) of the tube (34) directly on the glue on the web (17) of filter paper as it is being folded over around the operator block (94).
The apparatus according to any of the foregoing claims from 1 to 4, wherein the operator block (94) has the shape of an elongated, tapering solid and is positioned in such a way that its wide end (253) faces the direction (254) opposite the direction in which the web (17) of filter paper is being fed, the operator block (94) having oblique side walls (98) bearing the emitters (96) in such a way that the latter face the inside of the tube (34) in order to reactivate the glue on the faces (97).
The apparatus according to any of the foregoing claims, wherein the emitters are apertures (96) passing through the oblique side walls (98) and communicating with an internal chamber (259) common to both the rows (251) and supplied with the gaseous fluid.
The apparatus according to any of the foregoing claims, wherein the apertures (96) are substantially rectangular in shape.
Dependencies are inferred from the claim text.