DE6939904U - FILTER TUBE FOR PREPARING A COFFEE DRINK - Google Patents

Description

Pa. Vox coffee plant Groneweg & Meintrup, Münster (Westphalia)

Filter bag for preparing a coffee beverage.

The invention relates to a filter bag for preparing a coffee beverage made from roasted ground coffee. The one to filter The filter bags commonly used in a coffee infusion consist of a fibrous filter paper with an average pore size of 0.5% to at most 2%, which gives a bare, clear film lets through. This filtrate, produced with the usual coffee filters, largely leaves the roasted coffee aroma in the case of roasted coffee miss, so that such a coffee filtrate is similar in taste to an extract coffee. If, in contrast, roasted coffee is used in If it is placed in a pot and then poured into the cup after a short pull, this coffee will contain the desired dry coffee aroma. However, this unfiltered coffee leaves an undesirable sediment in the cup.

The object of the invention is to meet the requirements for filtering a ground roast coffee in the manner create that the coffee beverage acquires a coffee aroma of a significant extent without the risk of sentence formation must become.

The invention is therefore that a filter material is used for the filter bag, which colloidal Roasted coffee particles can still pass into the filtrate when the coffee is brewed, while coarse coffee particles are left as residue ^ remain in the filter bag.

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The filter bag advantageously consists of a filter paper

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and / or a paper-like plastic or the like. with a pore size of at least 5 Å "to a maximum of 20 ^.

According to the invention, it has been found that the colloidal roasted coffee particles in particular are the carriers of the roasted coffee aroma. The invention allows these colloidal particles to pass through the filter, giving the coffee beverage the desired aroma. On the other hand, the filter holds back coarse particles, which are particularly relevant for sentence formation. In the filter bag according to the invention, the pore size of the filter material is kept in such a range that the colloidal ^particles carrying the aroma, the size of which is between 5 tL and a maximum of 20 ^, can pass through the filtrate. In this way, on the one hand, the roasted coffee aroma is transferred into the filtrate and, on the other hand, all coarser particles that tend to sediment are retained.

The filter materials in question according to the invention, especially in the case of large filter bags, can be a soft and possibly show limp behavior. In order to increase the dimensional stability of these filter bags according to the invention, it is proposed that stiffening beads are embossed in the filter material. You can largely get into the filter material a different pattern, e.g. in the form of circular rings, rhombuses, trapezoids or the like. imprint. Preferably the stiffening beads or the pattern is embossed into the filter material so that this pattern is relief-like emerges on the outer wall of the filter bag. You can also use these stiffeners on the inside or on the inside and outside Attach the outside of the filter bag.

The consequence of this arrangement is that the entire outer surface of the filter bag does not come into contact with the inner wall of the filter vessel applies. Rather, the filter bag is supported on the inner wall of the filter vessel only with the relief-like elevations away. This leaves cavity paths between the inner wall of the filter vessel and the outer wall of the filter bag, which the outflow of the "emerge from the filter bag-

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the filtrate together with the colloidal host coffee particles relieved.

In the drawing, a conventional filter vessel with a filter bag is shown as an exemplary embodiment in a side view.

It shows number 1 the filter vessel, which is placed with its collar 2 on the coffee pot, not shown, during coffee infusion. In this filter vessel 1 there is the filter bag j5, which may consist of a filter paper material and / or filter plastic material, the pore size of which, however, may vary ^{between 5 / l} to a maximum of 20 ^l. This filter bag may be made in the usual way from a blank in which two halves are folded onto one another and the open side edge and the bottom edge have a knurled closure.

In the drawing is a part of the filter vessel and also the associated part of the filter bag shown in section. It can be seen that the filter bag protrudes outwards in a relief-like manner Has stiffening beads 4. With these stiffening beads, the filter bag 3 is supported on the inner wall 5 of the filter vessel 1 from. It thus remains between the outer wall of the filter bag 3 and the inner wall 5 of the filter vessel channel-like paths 6 that support the drainage of the coffee filtrate including colloidal roasted coffee particles. The filter material becomes the filter bag through these stiffening beads 4 or another modified pattern of an embossing Desirably stiffened in spite of the substantially large pore size.

Expectations

Claims (4)

Protection claims. 1. Filter bag for coffee filter vessels for preparing a Coffee beverage made from ground roast coffee, characterized in that that they are made of a filter paper and / or a paper-like plastic material or the like. With such Pore size exists that colloidal roasted coffee particles are still transferred into the filtrate during the coffee infusion coarser coffee particles remain in the filter bag. 2. Filter bag according to claim 1, characterized in that it consists of a filter paper and / or a paper-like plastic or the like. With a pore size of at least 5, ^ll to a maximum of 20 ^l -. J5. Filter bag according to Claims 1 and 2, characterized in that that in the filter material stiffening beads or some other pattern, e.g. in the form of circular rings, rhombuses, Trapezoids are embossed. 4. Filter bag according to claim 3, characterized in that the stiffening beads or other patterns emerge in relief on the outer wall.