Package making – With cover-adjunct application or formation – Adjunct comprising graspable appendage – e.g. – handle
Patent
1996-12-04
1999-02-16
Culver, Horace M.
Package making
With cover-adjunct application or formation
Adjunct comprising graspable appendage, e.g., handle
53120, 206 05, 493226, 493375, 493388, B65B 2904, B65B 6114, B65B 6124
Patent
active
058708804
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/IT96/00065 filed Apr. 2, 1996, which designated the U.S.
TECHNICAL FIELD
The present invention relates to a machine for the manufacture of filter bags each containing a substance with which to prepare an infusion and provided with a finger tab label attached by an interconnecting thread, the bags in question being of the type fashioned from tubular blanks of filter paper having an elongated appearance, each bag being filled with measured and separate quantities of the substance distributed along its length. The machine comprises a wheel carrying grippers with radial arms, capable of indexed rotation and operating in conjunction with:
an infeed station at which a tubular blank is taken up along a direction substantially tangential to the wheel;
a station at which the tubular blank is folded double by rotation about a pleat formed across a portion of the blank lying between the opposite ends, in such a way that the two resulting halves are brought together; the folding station is equipped with two stationary bearing elements disposed along the tangential direction and affording respective surfaces that converge toward the wheel, also with elements capable of movement between the stationary elements toward and away from the wheel, by which each tubular blank in turn is restrained from either side, taken up from the infeed station, folded in conjunction with the stationary elements and directed between the arms of the grippers.
The invention relates in particular to a type of filter bag in which the infusionable substance is localized in two envelopes created with folds applied to the paper from which the bag is fashioned.
BACKGROUND ART
Italian patent 1 207 630 discloses equipment for teaches the assembly of a filter bag coated with a film of heat-sealable thermoplastic material and having a label attached by a thread that is anchored at one end of the bag between two heat-sealed edges, then passed around and secured externally to the bag by a number of spot seals.
The manufacture of this type of bag dictates the use, at least to an extent, of paper or other material such as can be heat-sealed. Unfortunately there are certain considerations precluding the use of such materials, connected with the risk that substances released from the heat-sealed thermoplastic can migrate into the infusion following interaction with a liquid at high temperature.
A further drawback of this solution is discernible in the higher cost of heat-sealable paper as compared to normal filter paper.
U.S. Pat. No. 2,307,998 discloses a solution, belonging to the prior art, wherein the thread, the bag, and the finger tab label are interconnected by knots.
The formation of knots as taught by that patent does not favor automation of the manufacturing process to a speed that would be suitable for the industrial scale production of filter bags containing an infusionable substance; indeed as regards this aspect of the process, the industrial solution most widely adopted remains that of securing the thread with metal staples.
There is also a drawback with the solution of stapling, however, in that it introduces a foreign element into the infusion of which the presence is considered inappropriate for obvious reasons of hygiene. Moreover, the presence of a metal staple is undesirable by reason of the possible change in organoleptic properties of the infusion attributable to the metal.
Italian patent application n.sup.o B094A 000319, filed by I.M.A. INDUSTRIA MACCHINE AUTOMATICHES S.p.A., discloses a method of attaching a label to a filter bag by means of a special knot such as will allow the manufacture of bags, with respective finger tab labels, on industrial scale, and making no use of metal staples.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a machine for the manufacture of filter bags incorporating no heat seals, in which a finger tab label is attached to each bag by way of a knotting operation performed at a station equipped speci
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Culver Horace M.
I.M.A. - Industria Macchine Automatiche - S.p.A.
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