WO1998041131A1 - Filtriervorrichtung, filterelement und verfahren zur herstellung des filterelements, das zum herstellen von brühgetränken dient - Google Patents
Filtriervorrichtung, filterelement und verfahren zur herstellung des filterelements, das zum herstellen von brühgetränken dient Download PDFInfo
- Publication number
- WO1998041131A1 WO1998041131A1 PCT/EP1997/001294 EP9701294W WO9841131A1 WO 1998041131 A1 WO1998041131 A1 WO 1998041131A1 EP 9701294 W EP9701294 W EP 9701294W WO 9841131 A1 WO9841131 A1 WO 9841131A1
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- WO
- WIPO (PCT)
- Prior art keywords
- filter element
- filter
- folds
- die
- paper
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/06—Filters or strainers for coffee or tea makers ; Holders therefor
- A47J31/08—Paper filter inlays therefor to be disposed after use
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/06—Filters or strainers for coffee or tea makers ; Holders therefor
Definitions
- Filtering device, filter element and method for producing the filter element which is used to produce brewed beverages
- the invention relates to a filtering device for producing brewed beverages with a filter support and a filter element made of filter paper, which in turn has a receiving space for filling with extraction goods, such as ground coffee or tea leaves, which give off extraction substances after contacting them with hot water, so that from the A brewed beverage flows out of the filter element, the filter element being seated in the filter carrier. Furthermore, a second invention relates to the filter element that can be used in the above-mentioned filtering device. Finally, a third invention relates to the method required to manufacture the filter element.
- a filter device for a coffee machine which is used to produce brewed beverages.
- the filtering device consists of a ring-like section of a water pipe, or ring pipe for short, on the outside of which a filter bag is freely suspended.
- the filter bag can be filled with ground coffee, whereby hot water can be introduced through its opening for the purpose of filtration.
- the hot water penetrating through the open end of the annular water pipe flows freely after the extraction substances have been extracted (extraction process) from the extract material on the outer wall of the filter bag and is collected in a container placed underneath.
- the filter bag To assemble the filter bag, it is attached to the filter holder using holding means.
- an elastic band or an elastic cord is drawn into the filter bag at its upper end, which together with the opening of the filter bag is drawn from the outside around the ring line designed as a filter carrier.
- the elastic cord contracts such that the diameter of the filter bag above the ring line becomes smaller than the section around the ring line. In this way, the filter bag is attached to the ring line so that it cannot fall to the ground during brewing.
- Such a fastening of a filter bag to a filter carrier of a brewing beverage preparation machine is complex and complicated, since it ultimately depends on the operator how skillfully they widen the opening of the filter element in order to then put it over the ring line and how well they subsequently attach the filter element Aligns filter carrier so that the longitudinal axis of the filter element is substantially perpendicular; because if it is improperly installed, it can easily happen that the filter paper bag hangs obliquely, tears and / or even falls off the filter holder, which can lead to unpleasant scalding for an operator.
- a filter device which consists of a cup-shaped filter carrier and a cup-shaped filter element made of filter paper which is also inserted into the filter carrier.
- the wall of the cup-shaped filter element is wave-shaped and consists of wave crests and wave troughs running to the bottom of the filter element. In this way, the wave crests are only predominantly on the wall of the filter element, so that the brewed beverage can flow down better between the outer wall of the filter element and the inner wall of the filter carrier.
- a clamping ring is inserted in the upper area, which ensures that the wall can be held more easily on the wall of the filter carrier and thus the filter paper does not collapse when it gets wet.
- DE-40 38 023 A1 discloses a method for producing a two- or multi-shell container made of cardboard or a similar material, as described in the preamble of claim 17.
- the paper also called blank
- the paper is drawn in from the edge side of the die on the one hand and from the blank side on the other while drawing in further material.
- a stock of material has formed between the two dies, which is available to compensate for the shaping of the paper in the die space without the material being overstressed.
- a container is formed by drawing in material.
- the filter element should sit stable in the filter carrier without collapsing.
- the object of the second invention is to design the filter element used for the filtering device in a particularly simple and handy manner, by means of which a relatively stable shape is created without additional components, which is self-supporting and which is of particularly simple and inexpensive construction.
- the filter element made of normal filter paper is stiffened in the radial direction and can thus be supported securely via its large wing in the receiving area formed on the filter carrier.
- the filter element can be more easily inserted into the filter carrier by the folds until the wall of the filter element is then supported on the support of the filter carrier.
- a laborious unfolding of the filter element by hand is not necessary when inserting it into the filter carrier, since the filter element already has its final shape required for the brewing operation. Due to the stiffening, the filter element keeps its shape in the filter carrier even if the filter paper is soaked in water.
- the folds make a decisive contribution to the stiffening of the filter paper without the need for non-part stiffening agents.
- filter paper Conventional filter paper grades can be used for electrically operated or other domestic beverage preparation units.
- the folds can have any shape, it is only important that the shape of the filter element is formed so that when it is formed excess filter paper is formed, which is then deformed into folds.
- the first invention provides a particularly simple filtering device in which the filter element can be easily inserted into the filter carrier due to its simple handling until it sits freely in the filter carrier and then with its entire weight including the ground coffee, adheres to the wall of the receiving area of the filter carrier supports. No additional parts are required as holding means for the filter element.
- a filter element which is only made of filter paper, leads to particularly good extraction results in connection with the filter carrier during the brewing process, since the hot water - starting from the center - has to travel the same long way in almost all directions in order to flow evenly on the outer surface of the filter element can.
- a relatively rapid passage of the hot water through the extraction material, in particular with ground coffee is also achieved, so that bitter substances and other undesirable flavors are not released from the ground coffee into the hot water.
- the filter element can not only be easier to manufacture, but also easier to handle, since the sharp edges make a considerable contribution to stiffening the filter element.
- the sharp edge can range from 0.2 mm to 1 mm. This ensures that only the edges rest on the support surface of the filter carrier and are evenly supported there.
- open folds Due to the formation of open folds (claim 3), a particularly large filter area is achieved on the filter element.
- open folds here understood that in the direction of the longitudinal axis of the filter element, that is to say in the direction in which the individual filter elements are separated from one another, not a single section of the surfaces of the folds is covered, ie, in the direction of view from above perpendicular to the imaginary longitudinal axis of the filter element must be practical the entire surface of the filter element should be visible, as is the case with a flat filter element, but here the surfaces are not visible in a shortened manner due to the non-oblique course, which is the case especially with the three-dimensional course of the ring section and the wall of the receiving area is.
- the folds make it possible to use particularly thin filter paper which is well permeable to extraction substances, which is advantageously reflected both in the low price of the filter element according to the invention and in the very good beverage quality, particularly in the case of coffee.
- the diameter of the filter element according to the invention at the transition from the region delimiting the receiving space to the edge should always be somewhat larger than that of the opening of the filter carrier, so that the edge region of the filter element always bears against the wall of the filter carrier with pretension can.
- the area delimiting the recording space should therefore be in its Transition area are always pressed resiliently against the filter carrier, so that this also improves the support of the filter element in the filter carrier itself and the handling when inserting the filter element. Due to the play-free position of the filter element in the filter carrier, the individual handles can be better controlled by an operator, which prevents damage to the filter element. As soon as the filter element then gets wet during the brewing process, these tensions disappear, but the filter element then also adheres to the wall of the filter carrier.
- the area of the filter element delimiting the overlapping area has overlapping folds, so that this area is consolidated and stiffened.
- the area delimiting the receiving space is dimensioned such that it bears against the transition area of the filter carrier. This measure is particularly advantageously achieved if the dimensions of the area of the filter element delimiting the receiving space are selected such that when the filter element is inserted into the filter carrier it is laterally limited by the transition area of the opening of the filter carrier delimiting the contact surface and thereby resiliently inwardly the filter element is pressed. As a result, the filter element in the dry state always resiliently presses against the transition area of the filter carrier, so that in this way the filter element is given additional hold by the filter carrier.
- this can also be formed by a basket provided with openings, or a basket can be connected to the transition area.
- the basket can, for example, be molded in one piece onto the filter carrier, but it can also be retrofitted as an individual part in the filter carrier.
- the basket consists of individual struts, so that the smallest possible area rests on the outer surface of the filter element, so as to enable the brewed beverage to drain away almost unhindered.
- the basket serves as a holding means for the filter element and centers the filter element in the filter carrier.
- An ellipsoid (hemispherical shape) has proven to be particularly advantageous as the contour of the filter element, since this shape enables the hot water flowing into the filter element to be uniformly radially outward from the center is distributed. As a result, hot water penetrates all parts of the ground coffee as evenly as possible in order to achieve the optimal use of ground coffee even with small amounts of ground coffee.
- An essentially hemispherical outer surface has proven to be an ellipsoid, the drip region of which has a larger radius than the rest of the region and whose transition region closer to the edge follows the lateral surface of a truncated cone.
- the less rounded drainage area on the filter element leads to a shorter drainage time, while the truncated cone-shaped transition area on the filter element on the one hand enables a better contact surface on the correspondingly designed area of the filter holder and on the other hand facilitates the shaping of the filter element and filter support in this area if this area above the Runs in the middle of a hemisphere.
- the filter carrier is composed of two or more parts.
- the support surface for the filter element is part of an intermediate part made of isolated struts, which is supported on the actual filter carrier.
- both the intermediate part and the filter carrier itself are easier to manufacture because of simpler shaping tools, and these parts can be cleaned more easily and better by hand, since they can be separated from one another.
- the support surface of the filter element can be supported on the support surface of an intermediate part, which in turn supports itself on the filter carrier.
- the intermediate part can also only be attached or clipped onto the transition region of the filter element or be fastened in some other way.
- the intermediate part and the filter carrier form the actual filter carrier for the filter element.
- this is necessary for injection molding considerations, to manufacture the filter carrier from more than two parts and then to assemble it into a so-called "filter complete".
- the water in a water tank of the beverage preparation machine is fed to a water heater, heated there and preferably fed via a riser pipe to the opening of the filter element, from where it flows onto the surface of the ground coffee or tea leaves and is evenly distributed in the receiving space.
- the extracted drink then flows through the lower drain point of the Filter element directly or via the housing of the filter carrier into a container placed underneath.
- the second invention relates to the filter element itself, which is made of filter paper and in turn has an opening and a receiving space for filling with extraction goods such as ground coffee or tea leaves.
- the filter element is reinforced by folding. As a result of the folds according to the invention, the filter element is not only stiffened, but it also becomes more tear-resistant and more rigid due to the material reinforcement.
- Such a filter element is easy to handle and is elastic enough when inserted into a filter carrier adapted to the shape of the filter element. The fact that the filter element has its final shape before insertion results in simple handling. Filter elements of this type can be stacked one inside the other and can thus be stored in a confined space in the household. In this way, several filter papers can be made one on top of the other to produce several filter elements.
- the open folds can either be formed only at the transition area or over the entire outer area.
- the use of only open pleats results in a particularly flexible filter element that still returns to its original position even with larger deformations from the outside.
- a very elastic, yet dimensionally stable filter element is created, especially in the dry state, which can be radially compressed due to the open folds in diameter.
- the filter element In brewing mode, the filter element, despite its change in stability from dry to wet, still rests securely in the filter holder and lies against the wall.
- the filter element can, however, also be provided with closed, ie overlapping folds according to claim 1 1, which can then additionally be pressed tightly against one another in their overlapping areas (claim 1 2).
- the deformability of the filter element is more resistant or stable.
- the insertion of the filter element into the filter carrier before the brewing process is somewhat more complex to handle than in the case of Filter element with open folds, because due to the relatively rigid filter element, this can only be inserted into the opening of the filter carrier with a little more pressure.
- the filter element is also less resistant to kinking since its diameter, unlike the open folds, cannot be reduced.
- the folds run in the longitudinal direction of the filter element according to the features of claim 1 3, the highest tensile strength is achieved in the transition region and at the edge of the filter element. With this course, the folds remain almost unchanged.
- the most favorable course of the pleats is achieved if they run radially outwards (claim 14) and only begin at a certain distance from the drip area on the circumferential surface of the filter element.
- the depth of the folds increases radially outwards so that it is greatest in the edge region. The increase in the depth of the folds can be gradual or gradual.
- the filter element is made in one piece from filter paper and has 20 to 60 g, preferably 35 g per m 2 basis weight. Thinner types of filter paper are hardly possible, since then the load on the filter paper becomes too high at the maximum fill level in the brewing operation and therefore it could easily lead to tears in the filter paper.
- patent claim 1 6 determine the shape of the area of the filter element that delimits the receiving space. Such an ellipsoidal shape has proven to be the best shape when filtering coffee, since all areas of the ground coffee are almost uniformly infused with hot water. Therefore, the inflow of hot water must then be adjusted due to the increased flow rate.
- a mountain fold connects to a valley fold in the circumferential direction of the filter element.
- the paper cross-section increases towards the edge, preferably essentially constant. This is achieved in that the number of folds on the circumference of the filter element increases towards the edge (features of claim 1 8). This increase in resilience towards the edge can be further improved by the features of claim 1 9 by now also increasing the depth of the folds towards the edge of the filter element.
- a method for producing a molded part to be formed from paper in which the molded part is a filter element made of thin filter paper, which in turn has an opening and a receiving space for filling with extraction goods, such as ground coffee or tea leaves.
- This filter element is formed by folding the filter paper when it is inserted into the hollow mold, so that here too there is no excessive stress on the filter material.
- the shape of the filter element is thus designed such that the surface of the filter element is reduced during the deformation and the resulting excess material is distributed into spatial layers which are formed by folds.
- This method makes it possible to form a filter element made of thin filter paper in one piece and without cuts. Such a method enables any shape of a filter element.
- This method can be used in particular for filter elements with an ellipsoidal outer contour. This process is extremely simple, inexpensive and time-saving for producing filter elements.
- the fixing means consist of a counter-holder that can be moved out and in of the die.
- the fixing means can be generated by suction or pressure forces.
- other fixing means to be formed on the filter element for example projections or depressions, are also conceivable, which engage in centering devices of the tool.
- the surfaces of the tool parts are designed so that they ultimately bring the filter element into the desired final shape.
- the surfaces of the tools run in such a way that folds occur during the manufacturing process of a filter element, which are undercut-free, that is to say as open Wrinkles run. This makes it possible for several layers of filter paper to be placed in the tool, so that a larger number of filter elements can be produced in a single operation. How many layers of filter paper can be loaded depends on the thickness of the paper and the shape of the tool.
- the features of claim 27 ensure that the flank areas of the up and down folds of the filter element are pulled as far as possible through the tool shape that forms the filter element, so that the flank areas do not rest against the shaping tool walls during the pressing process. In this way, an undesired additional wrinkle formation during the pressing process is avoided within the desired folds itself, which makes it possible to remove the individual filter elements from the filter package in the first place.
- the formation of folds is predetermined by prior introduction of press edges into the filter paper disk and thus also particularly facilitated.
- filter elements with closed folds can be produced by the smooth design of the die, punch and hold-down device, however, the filter elements must then be manufactured individually.
- the folds are created automatically and are then pressed into overlapping folds. Because of the closed folds, this method only allows the production of a single filter element.
- the closed folds are then solidified in accordance with the features of patent claim 30 by pressing the die, punch and hold-down device firmly against one another and thus pressing the filter element between these parts. This gives a filter element that is particularly stable but still elastic.
- FIG. 1 is a perspective side view of a household coffee machine with the filter holder shown in longitudinal section in FIG. 2 in the closed position, but on a smaller scale,
- FIG. 2 shows a longitudinal section of a filter carrier with a basket and with an inserted filter element provided with open folds
- a filter carrier 1 can be seen, which can be used in a housing 2 of a coffee machine 3 for domestic needs and is carried by this.
- a brewing head 4 is formed above the filter carrier 1 and is fixedly connected to the housing 2 via a web 5.
- a water tank 6 is formed on the side next to the web 5 and is seated on a base 7 of the housing 2. From the base 7 extends to the front a plate-shaped support foot 9, on the front of which a rocker switch or a slide switch 10 is arranged, which is connected to an electrical switch fixed in the support foot 9 but not shown here.
- the top of the stand 9 is delimited by a warming plate 11 on which a vessel 12, preferably a glass jug, is placed.
- the top of the glass jug 1 2 ends with a lid 1 3 seated on the glass jug 1 2.
- a handle 14 is attached to the outer periphery of the glass jug 1 2, preferably by gluing.
- the inlet pipe is connected via a line, not shown, to the water tank 6.
- the outlet of the instantaneous water heater is connected to the brewing head 4 via a riser pipe, not shown, which also runs in the web 5.
- the water tank 6 can be closed with a lid 15.
- the filter carrier 1 consists of a filter housing 16, which is preferably injection-molded from plastic, and which essentially has a hemispherical or ellipsoidal cross section.
- a tubular apron 17 is attached, which ends with its end face 18 slightly above the surface of the cover 1 3.
- a central outlet opening 1 9 is formed according to FIG.
- the apron 1 7 is used for better thermal insulation of the brewing beverage emerging from the outlet opening 1 9.
- the brewing head 4 completely closes the opening 21 of the filter carrier 1 in order to avoid heat losses during the brewing process.
- a basket 23 lies on the edge 22 of the filter housing 16, which together with the filter housing 16 forms the actual filter carrier 1.
- the basket 23 can also be formed in one piece with the filter housing 1 6. However, for better cleaning, it makes sense to form filter housing 1 6 and basket 23 in two parts.
- the basket 23 has an annular part 36 which is supported on the edge 22.
- a transition region 26 adjoins the ring part 36 at the bottom.
- the wall 20 of the transition region 26 is adapted to the outer envelope curve 29 of the outer wall 27 of the transition region 30 of the filter element 28.
- the wall 20 of the transition region 26, 30 therefore has a zigzag-shaped structure.
- the basket 23 consists of a single molded part, to which adjoin the lower transition region 26 at a distance from each other downwardly extending lattice-like struts 34 which are all connected to one another.
- the struts 34 essentially follow the envelope curve 29 of the ellipsoidal section 32 of the filter element 28, ie, within the region of the struts 34, the filter element 28 according to FIG. 2 is supported completely in both radial and vertical directions.
- the Basket 23 also gives filter element 1 a secure lateral position in filter carrier 1.
- the openings 25 formed by the struts 34 are only dimensioned so large that the filter element 28 cannot fall down through the openings 25.
- the transition region 30 has grooves 79 and elevations 11 5 adapted to the filter element, into which the mountain folds 52 or valley folds 51 engage when the filter element 28 is in the correct end position, so that the filter element 28 is seated in the basket 23 in a rotationally fixed manner.
- the wall 20 of the transition region 30 can be frustoconical, that is to say smooth.
- the filter housing 16 and the ring part 36 can be glued to one another at the edge 22, welded, connected via a thread, by clipping or similar connecting means.
- the ellipsoidal filter housing 1 6 is formed according to FIG. 2 by a closed wall 37 which runs at a distance from the basket 23.
- the double-walled design of basket 23 and wall 37 of filter carrier 1 creates a particularly thermally protected filter carrier unit 1.
- the ring part 36 enables the basket 23 to be removed without removing the filter support 1 from the coffee machine 3 (FIG. 1).
- the filter element 28 is made of thin filter paper, which essentially follows the contour of an ellipsoid.
- the edge 39 delimits the opening 21 of the filter element 28.
- the filter element 28 consists of overlapping folds 42 which run parallel to the longitudinal direction of the central axis 43, that is to say radially to the lowest point 63, which lies on the central axis 43 of the filter element 28, of the outer wall 27 of the filter element 28.
- the folds 42 extend essentially Z-shaped in cross section. The folds 42 are not too tight to one another, so that they still form a very small gap, which in extreme cases can even be closed in the dry state when pressed very tightly, so that only, as shown in FIG. 4, the overlap as one Line (overlapping fold 42) can be seen.
- the filter element 28 runs in the shape of a truncated cone in the transition region 30, while at the transition from the dividing line 44 it runs downward in a substantially hemispherical manner.
- the truncated cone angle 45 at the transition area 30 is approximately 15 ° with a diameter D in the region of the opening 21 of approximately 15 mm.
- the angle 45 can also be less than 15 °. However, it must always be greater than 0 ° in order to obtain a bevel through which the filter element 28 can be removed from the molding tool in the first place. The same applies to removal from a stack.
- the height H of the filter element 28 is approximately 75 mm.
- the filter element 28 is always flush with the transition region 26 - this is then smooth and not zigzag-shaped (as in FIG. 2) - the diameter D is preferably chosen to be a few millimeters larger.
- FIGS. 2 and 3 show a filter element 28 which, in contrast to the filter element 28 according to FIG. 4, has open folds 48.
- open folds 48 is to be understood that - in contrast to the overlapping folds 42 according to FIG. 4 - they do not undercut, that is, if one looks vertically into the receiving space 76 of the filter element 28 from above, the surface of the visible from above Filter paper can be seen without undercuts.
- the open folds 48 are formed by valley folds 51 and mountain folds 52.
- the valley and mountain folds 51, 52 are oriented towards the lowest point 63.
- two adjacent mountain folds 52 form an open fold 48 with a valley fold 51, which is designed to widen in a V-shape in cross-section in the direction of the central axis 43 from the beginning and which is delimited by the side walls 53, 54.
- Valley folds 51 are to be understood as the folds which, when viewed from above in the receiving space 76, can be seen as depressions or incisions 71 when one looks at the outer wall 27 from the outside. However, if one considers these incisions 71 according to FIG.
- this incision 71 presents itself exactly the other way round, that is, as a mountain fold 52 in the form of a gable roof-like elevation 72.
- This also applies analogously to the gable roof-like elevations 72, if one of looks on the outside of the filter element 28. So it always depends on where you look at the filter element 28, namely either in the receiving space 76 or from the outside on the outer wall 27. So if the object of the application speaks of a valley fold 51 or a mountain fold 52, then these are always Wrinkles meant that either look in the Represent the receiving space 76 or on the outer wall 27.
- the valley folds 51 start from the edge 39 in points 24 as a line and end in points 81 and 33, ie the folds 51 go into the outer wall 27 of the ellipsoid in this area Section 32 above.
- the folds 48 ending at the edge 39 all have the same geometry, ie all outer tips 67 of the valley folds 51 lie on a common horizontal plane when the tips 67 are connected to one another in a circle .
- the outer diameter D2 of the edge 39 of the shaped, that is to say finished, filter element is approximately 1 1 5 mm with a diameter D5 of the semi-hollow sphere (ellipsoidal section 32), which is delimited by the envelope curve 29, of approximately 105 mm.
- the envelope curve 29 is defined as an imaginary surface that results when a very thin skin is stretched over the mountain folds 52 and around the deepest point 63.
- a transitional region 30 adjoins the hemispherical region of the outer wall 27 of the filter element 28 at the dividing line 44.
- both the valley folds 51 and the mountain folds 52 run slightly conically outwards from the dividing line 44 at an angle 45 of approximately 8 °.
- This bevel 68 serves for better shaping of the filter element 28 after its shaping.
- longer 56 and shorter folds 57 are arranged on the filter element 28, evenly distributed on the circumference, all of which are directed towards the lowest point 63.
- Two shorter folds 57 are arranged between the longer folds 56.
- the tips 33 of the longer folds 56 lie on a common diameter D3 of approximately 35 mm.
- the tips 59 of the shorter folds 57 also lie on a common diameter D4, which is approximately 75 mm.
- the shorter and longer folds 57, 56 do not grow linearly both in their fold depth 74 and in their fold width 75 (FIG. 5).
- Linearly increasing pleats are known from the prior art from cup-shaped filter elements, in which the side wall rising from the circular base forms a truncated cone. If an ellipsoidal or hemispherical shape of the filter element 28 is to be produced, as is the case according to the invention, the folds 48 must increasingly fold away the filter material in such a way that on the one hand there is a surface in the development and on the other hand in the filter shape an ellipsoidal or hemispherical shape is created.
- the mode of operation of the filter unit according to the invention which consists of a filter element 28 inserted in a filter carrier 1, is as follows according to FIGS. 1 and 2:
- a single filter element 28 is removed from a stack of filter elements 28 or filter bags - a stack means a plurality of filter elements 28 which are plugged into one another, but which are not shown in the drawings as a stack - and inserted into the filter carrier 1.
- the filter holder 1 is previously pulled out of the housing 2 of the coffee machine 3 to the front or swung away to the side, so that the opening 21 of the basket 23 or the filter holder 1 is freely accessible from above.
- the filter element 28 is then inserted through the opening 21 into the basket 23 or into the filter housing 1 until its bottom 62 lies flush against the inner surfaces of the struts 34.
- the outer wall 27 of the filter element 28 is elastically compressed radially inward by the transition region 26 of the basket 23, that is to say the valley folds 52 are always in contact with the transition surface 26 of the filter carrier 1 or the basket 23 with a slight pretension, so that the filter element 28 are slowly brought into its end position when inserted can.
- the radial constriction when the filter element 28 is inserted is absorbed particularly elastically by the upward and radially outward-extending, V-shaped valley and mountain folds 51, 52, so that the filter element 28 is very easily inserted into the filter carrier 1 with very little force can be used.
- the elastic behavior of the filter element 28 according to FIG. 4 is not as good as that of the filter element 28 according to FIGS. 2 and 3, because folds 42 and non-open folds 48 are present on the filter element.
- the rigidity is higher.
- ground coffee (not shown) is entered. 1, the filter carrier 1 is then brought into the closed position shown there, so that the brewing head 4 closes the opening 21 from above and the line (not shown) coming from the water heater is located above the opening 21 of the filter element 28. If hot water is now poured onto the ground coffee by hand or, according to FIG. 1, by putting the instantaneous heater (not shown) into operation, hot water is introduced into the opening 21 via the web 5 and the brewing head 4 into the opening 21, this penetrates into the ground coffee and extracts extraction substances from the extraction material.
- the brewed beverage produced in this way flows due to the almost equal distance from the center M (this is the area on the one hand that results when water runs in and a medium liquid level with a medium to full filling level of ground coffee and on the other hand the area of the filter element 28, from which the radial distance to the wall of the filter element 28 is approximately the same) to the outer wall 27 of the filter element 28, the brewed beverage is evenly removed from the outer wall 27 without being significantly prevented from flowing out by the basket 23. Due to the capillary action, moisture also migrates to the edge 39 of the filter element 28, which forms a liquid layer between the transition regions 26 and 30.
- the brewed beverage flows out almost uniformly on the outer wall 27 of the filter element 28 after the extraction substances have been extracted uniformly from the extraction material.
- the brewed beverage has reached the lowest point 63 of the filter element 28, it separates from the filter element 28 and flows into the receiving space 77, from where it leaves the filter carrier 1 via the opening 1 9 and flows into a glass jar 1 2 placed underneath.
- the brewing process is ended.
- the ellipsoidal shape of the filter element 28 also prevents long dripping.
- the filter carrier 1 according to FIGS. 1 and 2 can now be taken out of the housing 2 again and by tipping over the filter carrier 1 the filter element 28 together with the coffee cake (not shown) can be ejected.
- the filter element 28 which consists of very thin filter paper, preferably with a paper thickness of only 0.1 mm, for the first time creates a very stable filter paper shape even in the wet state, in which the filter element 28 itself in the filter carrier 1 is secure without the need for expensive holding means sits.
- the stable filter paper shape enables easy handling and, thanks to the ellipsoidal shape, allows excellent brewing results.
- the brewed beverage can flow almost unhindered past the outer surface and past the basket 23, which reduces the length of time the hot water stays in the filter element 28 and thus introduces undesirable flavors and aromas on the one hand and on the other hand prevents the brewing beverage from cooling too quickly.
- FIGS. 6 to 10 show the individual method steps for producing one or more filter elements 28 corresponding to FIGS. 2 to 4) with the aid of a tool 92.
- the tool 92 consists of a punch 82, a die 83, a hold-down 84 and a counter-holder 89 as a fixing means.
- the die 83 has an ellipsoidal cavity 97, the inner wall of which is either smooth or provided with wedge-shaped incisions 96. In the smooth design of the inner wall 98 (not shown), a filter element 28 according to FIG. 4 is produced and in the case of the inner wall 98 provided with wedge-shaped incisions 96, a filter element 28 shown in FIGS. 2 and 3 is produced.
- the surface of the stamp 82 must then either be smooth (filter element 28 according to FIGS. 2 and 3) or be provided with wedge-shaped elevations 95 (filter element 28 according to FIGS. 8 to 11), which then fit into the corresponding wedge-shaped incisions 96 in the matrix 83 can intervene.
- a bore 100 is formed on the die 83 in the center, which is penetrated by the counter-holder 89 designed as a fixing means.
- the inner surface 101 forms on the counter-holder 89 with the inner wall 98 of the die 83 in that position the ellipsoidally closed hollow form 97 when the counter-holder 89 presses against the punch 82 or the die 83 then moves up again together with the counter-holder 89 (FIG. 9).
- the inner surface 1 01 of the counter-holder 89 is either smooth or provided with wedge-shaped incisions 96 which engage in the elevations 95 in the stamp 82.
- the die 83 can be displaced relative to the counter-holder 89 in the longitudinal direction of the central axis 102.
- the counter-holder 89 can be displaced in height in relation to the die 83 in the direction of the central axis 102. Both the counter-holder 89 and the die 83 can also be moved up and down at the same time.
- the punch 82 is formed perpendicularly below the die 83 and the counter-holder 89, which essentially consists of an ellipsoidal hemisphere 104 which runs centrally to the central axis 1 02.
- wedge-shaped elevations 95 are formed, which run in such a way that, when the punch 82 and die 83 are moved together, the incisions 71 of the filter element 28 on one side or the incisions 96 of the die 83 on the one side fill in the other side.
- the tool 92 is extended, that is, the die 83 with the counter-holder 89 extend at a distance above the punch 82, so that a space 106 is created between the punch 82 and die 83 with the counter-holder 89, which enables a paper blank 93 or to lay a stack 1 1 2 of several paper blanks 93 from the side onto the top 103 of the hold-down device 84 by means of a gripping device (not shown).
- the thickness d is intended to represent a plurality of paper blanks 93 lying one above the other.
- the die 83 and the counter-holder 89 approach the punch 82 and the hold-down 84, it being immaterial whether only the die 83 with the counter-holder 89 or only the punch 82 or all parts move towards one another.
- the die 83 moves against the hold-down device 84 until the wedge-shaped elevations 95 slightly engage in the wedge-shaped incisions 96 on the die 83.
- the outer area of the paper blanks 93 is preformed into slightly V-shaped incisions 71 and roof-shaped elevations 72.
- the counter-holder 89 moves against the surface of the filter paper packet 1 1 2 and thereby presses the underside 1 09 of the last lower paper disc 93, that is to say the entire filter paper packet 1 1 2, with prestress against the surface 99 of the stamp 82.
- the paper discs are 93 relative to the tool 92, as can be seen in FIG. 1 4, fixed and centered.
- the filter paper packet 1 1 2 rests on the surface 99 of the stamp 82 by the area of the filter paper packet 1 1 pressed lightly by the hold-down device 84 against the ring surface 1 10 of the die 83 2 slides radially inwards and the valley folds 51 and mountain folds 52 according to FIGS. 2 and 3 are introduced into the filter element 28 through the die 83 and the hold-down device 84.
- the hold-down device 84 presses against the filter paper packet 1 1 2 just so firmly that it always has sufficient tension in its central region and at the same time the radially outer edge of the filter paper packet 1 1 2 slides out of the gap 85 inwards.
- the filter paper packet 1 1 2 is thus drawn according to the invention formally over the corner region 1 14, the valley folds 51 and mountain folds 52 according to FIGS. 2 and 3 being simultaneously formed by the die 83 and the hold-down device 84. This process continues until the punch 82 has now completely moved into the cavity 97. While the wedge-shaped elevations 95 engage in the wedge-shaped incisions 96, the filter paper packet 1 1 2 is pressed into its final shape, also on the inner area which does not slide over the corner area 1 14.
- the stamp 82 is pressed so firmly against the die 83 and the counter-holder 89 that the filter paper packet 1 1 2 receives its final shape according to FIGS. 2 and 3.
- the inner ring 86 now presses against the edge 39 of the filter paper packet 1 1 2, that on the one hand the gap 85 disappears and on the other hand the edges 39 of the filter paper packet 1 1 2 are pressed firmly against each other in order to achieve a stable shape of many filter elements 28 in the filter paper packet 1 1 2.
- the molding process is finished.
- the die 83 with the counter-holder 89 now moves out of the punch 82 and the hold-down 84.
- the filter paper packet 1 1 2 is thus held in the die 83 only by its radial prestress, which acts against the inner wall 89 of the die 83. But it is also possible if the preload is too low and falling out of the filter paper packet 1 1 2 from the cavity would be possible to attach a suction device (not shown) to the counter-holder 89, through which the filter paper packet 1 1 2 lies firmly against the counter-holder 89.
- the finished filter paper stack consisting of a plurality of finished filter elements 28, can be removed from the tool 92.
- the finished filter paper package 1 1 2 can then be used in a packaging adapted to the filter paper package 1 1 2. The very simple manufacturing process of one or more filter elements 28 is thus ended.
- a tab 1 1 7 is formed on the edge 39, which improves the handling of a filter element 28.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Apparatus For Making Beverages (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA99008239A MXPA99008239A (es) | 1997-03-14 | 1997-03-14 | Dispositivo de filtrado, elemento de filtrado y procedimiento para la fabricacion del elemento de filtrado que sirve para la preparacion de bebidas por infusion. |
CA002284526A CA2284526A1 (en) | 1997-03-14 | 1997-03-14 | Filtering device, filtering element and method for producing said filtering element for making boiled beverages |
AU20274/97A AU2027497A (en) | 1997-03-14 | 1997-03-14 | Filtering device, filtering element and method for producing said filtering element for making boiled beverages |
EP97908236A EP0967905A1 (de) | 1997-03-14 | 1997-03-14 | Filtriervorrichtung, filterelement und verfahren zur herstellung des filterelements, das zum herstellen von brühgetränken dient |
PCT/EP1997/001294 WO1998041131A1 (de) | 1997-03-14 | 1997-03-14 | Filtriervorrichtung, filterelement und verfahren zur herstellung des filterelements, das zum herstellen von brühgetränken dient |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1997/001294 WO1998041131A1 (de) | 1997-03-14 | 1997-03-14 | Filtriervorrichtung, filterelement und verfahren zur herstellung des filterelements, das zum herstellen von brühgetränken dient |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998041131A1 true WO1998041131A1 (de) | 1998-09-24 |
Family
ID=8166549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001294 WO1998041131A1 (de) | 1997-03-14 | 1997-03-14 | Filtriervorrichtung, filterelement und verfahren zur herstellung des filterelements, das zum herstellen von brühgetränken dient |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0967905A1 (de) |
AU (1) | AU2027497A (de) |
CA (1) | CA2284526A1 (de) |
MX (1) | MXPA99008239A (de) |
WO (1) | WO1998041131A1 (de) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR433587A (fr) * | 1911-08-25 | 1912-01-10 | Public Service Cup C | Gobelets en papier |
DE635095C (de) * | 1936-09-10 | Melitta Werke A G | Filtergefaess in Tassenform | |
CH241385A (de) * | 1944-09-28 | 1946-03-15 | Grueter Hans | Kaffee-Filtriervorrichtung. |
DE2026564A1 (de) * | 1970-05-30 | 1972-04-27 | Mueller Fa Konrad | Werkzeug zur Herstellung plissier ter Folienkapseln |
DE2548323A1 (de) * | 1975-10-29 | 1977-05-12 | Bentz & Sohn Melitta | Filtervorrichtung |
US4075107A (en) * | 1976-07-14 | 1978-02-21 | Brown Company | Novel filter and method of making same |
EP0278080A1 (de) * | 1987-01-24 | 1988-08-17 | J.C. Binzer Papierfabrik GmbH & Co. KG | Filtereinsatz |
EP0442061A1 (de) * | 1990-01-13 | 1991-08-21 | Melitta Haushaltsprodukte GmbH & Co. Kommanditgesellschaft | Filtervorrichtung zur Herstellung von Aromaauszügen |
DE29510884U1 (de) * | 1995-04-10 | 1995-09-28 | Melitta Haushaltsprodukte | Filter für Aufgußgetränke, insbesondere Kaffeefilter |
-
1997
- 1997-03-14 EP EP97908236A patent/EP0967905A1/de not_active Withdrawn
- 1997-03-14 AU AU20274/97A patent/AU2027497A/en not_active Abandoned
- 1997-03-14 WO PCT/EP1997/001294 patent/WO1998041131A1/de not_active Application Discontinuation
- 1997-03-14 CA CA002284526A patent/CA2284526A1/en not_active Abandoned
- 1997-03-14 MX MXPA99008239A patent/MXPA99008239A/es unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE635095C (de) * | 1936-09-10 | Melitta Werke A G | Filtergefaess in Tassenform | |
FR433587A (fr) * | 1911-08-25 | 1912-01-10 | Public Service Cup C | Gobelets en papier |
CH241385A (de) * | 1944-09-28 | 1946-03-15 | Grueter Hans | Kaffee-Filtriervorrichtung. |
DE2026564A1 (de) * | 1970-05-30 | 1972-04-27 | Mueller Fa Konrad | Werkzeug zur Herstellung plissier ter Folienkapseln |
DE2548323A1 (de) * | 1975-10-29 | 1977-05-12 | Bentz & Sohn Melitta | Filtervorrichtung |
US4075107A (en) * | 1976-07-14 | 1978-02-21 | Brown Company | Novel filter and method of making same |
EP0278080A1 (de) * | 1987-01-24 | 1988-08-17 | J.C. Binzer Papierfabrik GmbH & Co. KG | Filtereinsatz |
EP0442061A1 (de) * | 1990-01-13 | 1991-08-21 | Melitta Haushaltsprodukte GmbH & Co. Kommanditgesellschaft | Filtervorrichtung zur Herstellung von Aromaauszügen |
DE29510884U1 (de) * | 1995-04-10 | 1995-09-28 | Melitta Haushaltsprodukte | Filter für Aufgußgetränke, insbesondere Kaffeefilter |
Also Published As
Publication number | Publication date |
---|---|
CA2284526A1 (en) | 1998-09-24 |
AU2027497A (en) | 1998-10-12 |
MXPA99008239A (es) | 2003-07-21 |
EP0967905A1 (de) | 2000-01-05 |
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