Package making – Methods – Forming a cover adjunct or application of a cover adjunct to...
Patent
1996-11-15
1998-08-25
Moon, Daniel
Package making
Methods
Forming a cover adjunct or application of a cover adjunct to...
531342, 206 05, B65B 2904
Patent
active
057972435
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a filter bag for infusible products, particularly for single-dose packages of tea, extracted beverages and the like.
BACKGROUND ART
It is known that for the preparation of hot infusions, there are commonly used single-dose portions of ground product, closed in a filter bag, that is soaked at the time of consumption of the infusion in a suitable container with boiling water.
These filter bags may have different structures, according to the solutions found in order to improve the ground product expansion after it has been dipped in water, so as to allow its best dissolution.
The most common structures are obtained from a sheet of filter paper, suitably folded after the ground product has been put thereonto, and then closed so as to prevent the ground product from going out.
Most common filter bags feature one or more sections or lobes for containing the ground product, with or without the side bellow-like folds.
This filter bag is closed either by thermowelding, if it is made of thermoweldable filter paper, or by gluing different outer edges of the filter bag, or using a metallic clip blocking the said edges.
One end of a cotton thread is fixed to the filter bag, while the other end of the thread bears a tag forming the pick-up element for handling the filter bag when introduced in or withdrawn from boiling water.
The thread is usually fixed to the filter bag by gluing or using a metallic clip, or by application of a label made of thermoweldable material that connects the thread with the upper edge of the filter bag.
Also the other end of the thread can be fixed to the tag by gluing or using a metallic clip.
For filter bags produced with thermoweldable filter paper, artificially obtained or, anyway, treated materials are used. These materials, when in contact with boiling water, could release substances which can change the infusion organoleptic features.
The metallic clip is preferably used for closing filter bags (and fixing the tagged thread) made of natural fibres, that cannot be thermally welded.
Also in this embodiment, the metallic clip, when in contact with boiling water and subsequently with the extracted beverage, could contaminate the infusion.
The object of the present invention is to provide a single-dose filter bag for infusible products, and a new method for closing the same and fixing a pick-up tagged thread thereto, without using materials harmful to health.
Accordingly, elements that sometimes could appear not quite safe, like metallic clips, are not used, since they can contaminate the infusion.
DISCLOSURE OF THE INVENTION
The above mentioned object is obtained, in accordance with the contents of claims, by means of a method for closing a filter bag for infusible products, and for connecting a tagged thread to the said filter bag, the said filter bag including at least a lobe and at least a flap folded to prevent the filter bag from opening and the infusible product from going out, a pick-up tag and a connecting thread, the said method being characterised in that in that it includes fixing means for locking the said flap in a pre-determined position and simultaneously fixing a free first terminal portion of the said thread to the said filter bag, the said terminal portion being defined at an end of the said thread other than the end where a second terminal portion is defined, and destined to be fixed to the said pick-up tag.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristic features of the present invention are pointed out in the following description with reference to the enclosed drawings, in which:
FIGS. 1 to 4 show manufacturing of a known filter bag according to conventional methods;
FIGS. 5a and 5b show a first embodiment of the method for closing the filter bag and simultaneously fixing a thread bearing at its other end a pick-up tag;
FIGS. 6a and 6b show a second embodiment of this method;
FIG. 7 shows a third embodiment of the aforementioned method;
FIGS. 11a to 11m show schematically working steps of the method for clo
REFERENCES:
patent: 1493982 (1924-05-01), Hirschhorn
patent: 1525161 (1925-02-01), Allatt
patent: 1557032 (1925-10-01), Cooper
patent: 1801588 (1931-04-01), Cooper
patent: 2148587 (1939-02-01), Slocum
patent: 2186087 (1940-01-01), Yates
patent: 2187417 (1940-01-01), Doble
patent: 2193974 (1940-03-01), Luckhaupt
patent: 2224753 (1940-12-01), Yates
patent: 4055668 (1977-10-01), Kopp
Cardinali Paolo
Tagliaferri Roberto
I.M.A. - Industria Macchine Automatiche - S.p.A.
Moon Daniel
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