NL8503092A - DISPOSABLE FILTER CARTRIDGE, WHETHER OR NOT COMBINED WITH A WATER CONTAINER. - Google Patents

Description

9 4 vo 7457

Title: Disposable filter cartridge, whether or not combined with a water tank.

The invention relates to a disposable filter cartridge, provided with a housing, essentially consisting of a bottom and an upright side wall, the bottom or bottom of which is provided with one or more openings and which filter cartridge is provided on the top and bottom. with filter material, which is in each case connected by means of a seal connection to the side wall or to the bottom of the housing, as known from applicant's Dutch patent application 83.00213 and furthermore from, for example, British Patent Specification 1,064,010 to. M.I.K. 0. and U.S. Pat. No. 3,823,656 to. Germaine Vander Veken.

These known cartridges serve to brew one or more coffee consumption units: the cartridges can of course also be used for brewing other drinks.

In these known filter cartridges, the filter material at the bottom is usually sealed to the periphery of the opening or openings in the bottom.

Also known are disposable filter cartridges, of which the peripheral side walls of the filter cartridge are top and bottom.

elongated laterally, in order to form a complete disposable filter with water reservoir. In this case, reference can be made, inter alia, to Belgian patent 52,280 in the name of. M.I.K. 0.

A drawback of these known constructions is that only a limited part of the bottom filter surface, ie the part of the filter material within the sealing seam, is effectively available for filtration. This results in a low filtration speed and high brewing times. A consequence of this was that use was made of disposable filter cartridges with a comparatively large diameter and narrow thickness of the coffee bed. However, this results in a low extraction efficiency.

The object of the invention is to eliminate the drawbacks mentioned.

For this purpose, a disposable filter cartridge of the type mentioned in the preamble has the feature that the space formed outwardly of the bottom sealing seam between the bottom and the filter material situated above it is in open communication with an opening in the bottom.

If the sealing seam between the bottom filter and the bottom is arranged on an elevated edge of the latter (so that technically the filter can be easily welded to the bottom), the connection may consist of one or more recesses, made in the said elevation. Another possibility consists in that one or more passage openings are arranged in the bottom outward of the said elevation in the bottom part of the housing.

In yet another embodiment of the invention, the intended object is achieved by making the bottom filter cup-shaped and sealing the top edge thereof at the top of the filter cartridge to the side wall or a top edge of the housing; i.e. above the level of the material to be extracted: This construction therefore lacks a sealing seam at the location of the bottom, so that a considerably larger filter surface is available here.

The invention further relates to a disposable filter cartridge, provided with a housing essentially consisting of a bottom and an upright side wall, wherein the bottom or bottom is provided with one or more openings and the filter cartridge of which the top and bottom are equipped with filter material, and which filter cartridge is characterized in that the peripheral side wall of the filter cartridge 35 extended to the side in order to form a complete disposable filter with water reservoir.

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To illustrate the invention, some embodiments of the disposable filter cartridge will now be described with reference to the drawing.

In the drawing: Fig. 1 is a cross section of a first embodiment of a disposable filter cartridge;

Fig. 2 is a bottom view of the disposable filter cartridge of FIG. 1:

Fig. 3 to 6 each show a part of a cross-section, 10 according to fig. 1, of alternative embodiments and

Fig. 7 is a cross section according to FIG.

1, on a reduced scale of a disposable filter cartridge with water reservoir; and FIG. 8 is a top view of yet another embodiment.

According to the drawing, a disposable filter cartridge is provided with a housing, generally indicated by 1, consisting of a bottom 2 and an upright side wall 20 3. The bottom of each cartridge is provided with one or more openings 4. The filter cartridge furthermore a filter fleece or similar filter material 5 is arranged on the inside near the bottom: Such a material is well known in the art and is also used with the disposable filters resp. disposable filter cartridges described in the preamble of this application. This filter fleece 5 is welded to the bottom at the location indicated by 6.

Near the top of the filter cartridge, a similar filter fleece 7 is welded by means of a welding seam 10. In order to be able to discharge a filtrate formed outward from the welding seam 6 into the space between the bottom 2 and the filter fleece 5 situated above it, the drawing shows various solutions indicated:

Fig. 1 shows recesses 8 in the bottom for this purpose, which in each case extend from said space to the underside of the bottom.

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In the exemplary embodiment shown in Fig. 3 there is a similar solution, with the proviso that the filter web 5 is welded to an elevated edge 18 of the bottom and the cut-outs 7 also extend through the elevated edge 18. Furthermore, in the exemplary embodiment shown in Fig. 3, the cartridge is provided on the underside with a number of supporting partitions 9, for supporting the filter fleece 5.

The exemplary embodiment shown in FIG. 4 differs from the embodiment of FIG.

3, that the support baffles are omitted and the opening 7 is in direct communication only with one or one of the openings 4 in the bottom.

When shown in FIG. 5 shown in the embodiment 5, the space between the bottom 2 and the filter web 5 located above it, is outwardly of the sealing seam 6 by means of openings 11 in direct connection with the environment.

The above-described embodiments all have an approximately equal filter area. Significant enlargement of this is obtained, in the embodiment shown in FIG. 6, wherein the bottom filter fleece 5 is cup-shaped and the outer circumferential edge thereof is welded to an upper circumferential edge 13 of the upright side wall or to the top of the side wall: Weld seam 12. The welding seam 10 of the upper filter fleece 7 is located outwardly thereof. In this way a disposable filter cartridge with a very large filter surface has been created, while it is structurally easy to manufacture. In the illustrated embodiment, support baffles 30 are also shown.

Fig. 7 shows a disposable filter cartridge, the upright side wall 2 of which is top and / or bottom. elongated laterally, in order to form a complete disposable filter with water reservoir: The extension is generally indicated by 14.

The underside of the disposable filter cartridge according to ^ * aw ^ ·> · '- * ·! . ; j ^ - * · -5- f

Fig. 7 essentially corresponds to that of FIG.

1.

Fig. 8 finally shows an embodiment of a disposable filter cartridge according to FIG. 1, but 5 in which the recesses 8 are missing and instead the welding seam 6 is interrupted, in order to form a passage for the filtrate instead of these interruptions.

Example

Cartridge with 6 g of coffee and 140 ml of poured water gives 120 ml of brew.

external cartridge diameter "55 60 mm hole diameter (mm) 43 48 mm traditional (filter acc. Ned.o.a.-8300213 lead time (min) 3.5 2.3 extraction efficiency (%) 28.3 26.6 filter according to fig. 4 of the invention lead time 2.3 extraction efficiency 21.7

After the foregoing it will be clear that a large number of variants are possible within the scope of the inventive idea.

Claims (6)

1. Disposable filter cartridge, provided with a housing, essentially consisting of a bottom and an upright side wall, the bottom or bottom of which is equipped with one or more openings and of which filter cartridge 5 the top and bottom are equipped with filter material 1. c. a filter fleece, which is in each case connected by means of a seal connection to the side wall or the bottom of the housing, characterized in that the space formed outwardly of the bottom sealing seam between the bottom and the filter material situated above it is in open connection with an opening in the bottom. Disposable filter cartridge according to claim 1, characterized in that the bottom seal seam is interrupted. A disposable filter cartridge according to claim 1, wherein the seal connection between the bottom and the filter material is located on an elevated part of the bottom, characterized in that one or more recesses are provided in said elevated part. Disposable filter cartridge according to claim 1, wherein the seal connection between the bottom and the filter material is located on an elevated part of the bottom, characterized in that outlets from said elevated part of the bottom below the filter material have passage openings in the bottom or side wall are fitted. 5. Disposable filter cartridge provided with a housing, essentially consisting of a bottom and an upright side wall, wherein the bottom or bottom is equipped with one or more openings and the filter cartridge of which the top and bottom are equipped with filter material, with the characterized in that the bottom filter material is cup-shaped and the outer circumferential edge thereof is welded to an upper circumferential edge of the upright side wall, then 0 ”0 3 2 -7-, however, it is welded to it at the top of the side wall. 6. Disposable filter cartridge according to one or more of the preceding claims, characterized in that the peripheral side wall of the filter cartridge is elongated above or sideways, respectively, in order to form a complete disposable filter with water reservoir. t * "."