FORM-RETAINING PAD FOR USE IN A COFFEE MAKER

Abstract

The invention relates to a pad for use in a coffee-maker, provided with an envelope with an inner space which is filled with a beverage preparation product, wherein the envelope is formed by a first disc-shaped sheet and a second disc-shaped sheet, wherein the interconnected parts of the first sheet and the second sheet form a sealing seam and wherein the first sheet and the second sheet each form a filter which can pass a fluid and which forms a barrier to the beverage preparation product, wherein, in use, with the coffee-maker a fluid such as water is supplied, under pressure, via the first sheet to the pad so that the fluid is pressed through the pad for obtaining the beverage which thereupon leaves the pad, wherein each sheet comprises at least one layer, and wherein at least one of the first sheet and the second sheet is of form-retaining design, made of at least one base compound comprising meltable polymers and preferably fibers and/or filaments of the same, and at least one enforcement compound comprising at least meltable polymers of the group of abaca, banana plant, flax, hemp, lyocell, tencel, kenaf, nettles, ramie, bamboo, bowstring, indian hemp, jute, cotton, coir, sisal, agave and preferably fibers and/or filaments.

Claims

1.-125. (canceled)

126. A form-retaining pad for use in a coffee-maker for preparing 1 or 2 cups of beverage from a fluid supplied under pressure and a beverage preparation product which includes a product to be extracted with a fluid and/or a product soluble in a fluid, the form-retaining pad comprising: an envelope with an inner space which is filled with the beverage preparation product for preparing the beverage, wherein the envelope comprises at least a first sheet and a second sheet which are interconnected adjacent their longitudinal edges, wherein the interconnected parts of the first sheet and the second sheet form a sealing seam and wherein the first sheet and the second sheet each form a filter which can pass the fluid and which forms a barrier to the beverage preparation product, wherein, in use with the coffee-maker, the fluid is pressed through the pad for obtaining the beverage which thereupon leaves the pad, and wherein each sheet comprises at least one layer; wherein the first sheet is of flexible design comprising at least 70% cellulose fibers and/or filaments with the remaining percentage of the first sheet of flexible design comprising polylactic acid (PLA) fibers and/or filaments; wherein the second sheet is of form-retaining design, comprising: at least one base compound comprising less than 100% PLA fibers and/or filaments with the remaining percentage of the second sheet of form-retaining design comprising: at least one enforcement compound comprising non-meltable fibers and/or filaments selected from abaca, banana plant, flax, hemp, kenaf, nettles, ramie, bamboo, bowstring, indian hemp, jute, cotton, coir, sisal, agave, lyocell, or tencel, and at least one additional base compound comprising meltable polymers; wherein the second sheet of form-retaining design comprises at least one layer comprising a homogeneous mixture of the at least one base compound and the at least one enforcement compound; wherein the second sheet of form-retaining design is configured to abut a bottom of a holder of the coffee-maker and a sidewall of the holder of the coffee-maker; wherein the first sheet is a top sheet and the second sheet is a bottom sheet and the first sheet has a thickness that is 1.4-10 times smaller than the thickness of the second sheet; and wherein the first and second sheets are compostable.

127. The pad according to claim 126, wherein the at least one additional base compound comprising meltable polymers comprises a plastic in the form of cellulose fibers and/or cellulose filaments which are provided with a plastic coating, and/or that the enforcement compound is provided in the form of fibers and/or filaments which are provided with a plastic coating.

128. The pad according to claim 127, wherein the plastic in the form of cellulose fibers and/or the plastic of the plastic coating comprises a plastic polymer selected from the group consisting of: polyethylene (PE), polyethylene terephthalate (PET), polyethylene terephthalate polyester (PETP), co-polyethylene terephthalate (coPET), linear low-density polyethylene (LLDPE), cast polypropylene (CPP), polylactic acid (PLA), polypropylene (PP), and combinations thereof.

129. The pad according to claim 127, wherein the second sheet of form-retaining design is nonwoven material.

130. The pad according to claim 126, wherein the base compound also comprises cellulose fibers, cellulose filaments, plastic polymers selected from PE, PET, PETP, coPET, LLDPE, CPP, and PP, or any combination thereof, wherein the plastic polymers are non-meltable up to a temperature of 170° Celsius, preferably 200° Celsius and more preferably 250° Celsius.

131. The pad according to claim 126, wherein the second sheet of form-retaining design is made form-retaining by means of a heat treatment and/or calendering.

132. The pad according to claim 126, wherein the second sheet of form-retaining design comprises a percentage that is less than 100% of PLA fibers and/or filaments and (100-x)% of the at least one enforcement compound, with x being in the range of 50-80, preferably in the range of 60-70, while the PLA fibers have a melting point of 105-165 degrees Celsius.

133. The pad according to claim 126, wherein a part of the second sheet is within the contours of the sealing seam and is of dish-shaped design and the first sheet is of flat design.

134. A system provided with a pad according to claim 126 and a coffee-maker, wherein the coffee-maker is provided with a holder for receiving the pad, a cover for closing off the holder, and fluid means for generating a fluid flow under pressure, wherein the holder is provided with at least one beverage outflow opening and the cover is provided with at least one fluid inflow opening which are in fluid communication with the fluid means for supplying the fluid flow to the fluid openings so that the fluid is supplied under pressure to the first sheet of the pad so that the fluid is pressed through the pad for the preparation of the beverage in the pad, the beverage leaving the pad via the second sheet to proceed to leave the holder via the at least one beverage outflow opening.

135. The system according to claim 134, wherein a fluid sealing is present between the second sheet and the bottom of the holder, which fluid sealing prevents the fluid which is supplied to the first sheet of the pad from flowing around the pad to the beverage outflow opening.

136. Use of a pad according claim 126, wherein the pad is placed in a holder which is provided with at least one beverage outflow opening, the holder with the pad therein is closed off with a cover which is provided with at least one fluid inflow opening, and a fluid is supplied under pressure to the at least one fluid inflow opening so that the fluid is supplied via the first sheet to the beverage preparation product in the pad for preparing the beverage and wherein the beverage leaves the pad via the second sheet, wherein the beverage proceeds to leave the holder via the at least one beverage outflow opening.

137. Use according to claim 136, wherein a fluid sealing is present between the second sheet and the bottom of the holder, which fluid sealing prevents the fluid which is supplied to the first sheet of the pad from flowing around the pad to the beverage outflow opening.

138. A method for preparing a beverage with a pad according to claim 126, wherein the pad is placed in a holder which is provided with at least one beverage outflow opening, the holder with the pad therein is closed off with a cover which is provided with at least one fluid inflow opening, and a fluid is supplied under pressure to the at least one fluid opening so that the fluid is supplied via the first sheet to the beverage preparation product in the pad for preparing the beverage and wherein the beverage leaves the pad via the second sheet, wherein the beverage proceeds to leave the holder via the at least one beverage outflow opening.

139. The method according to claim 138, wherein a fluid sealing is present between the second sheet and the bottom of the holder, which fluid sealing prevents the fluid which is supplied to the first sheet of the pad from flowing around the pad to the beverage outflow opening.

140. The method for making a pad according to claim 138, wherein in step a, a set-up of a third sheet, fourth sheet and the beverage preparation product is made, with the beverage preparation product situated between the third sheet and the fourth sheet, and then in step b, the third sheet and the fourth sheet are joined together, thereby forming the sealing seam so that the beverage preparation product is included in the inner space, wherein the third sheet is made of the same material as the first sheet and wherein the fourth sheet is made of the same material as the second sheet, wherein the fourth sheet is heated in a step c. and then is cooled in a step d. for increasing the bending stiffness of the fourth sheet, and wherein at least one sheet is made.

141. The method according to claim 140, wherein the fourth sheet is heated in step c. to a temperature of 200-400 degrees Celsius, optionally to a temperature of 90-200 degrees Celsius, in particular when the second sheet is made of PLA.

142. The method according to claim 140, wherein in a step e. the fourth sheet is placed in a mold so that the fourth sheet obtains a predetermined shape.

143. The method according to claim 142, wherein the beverage preparation product in a step f. is placed on the fourth sheet, preferably while the fourth sheet is already in the mold, and that step b. is carried out after step f.

144. The method according to claim 140, wherein the third sheet and/or the fourth sheet during the carrying out of step b. is heated to 90-400 degrees Celsius, in particular 90-200 degrees Celsius.

145. The method according to claim 140, wherein the fourth sheet and possibly the third sheet is cooled after carrying out step b.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The invention will now be further elucidated with reference to the drawings, in which:

[0068] FIG. 1 shows a possible embodiment of a pad according to the invention;

[0069] FIG. 1a shows a cross-section of one embodiment of a sheet used with the embodiment of FIG. 1;

[0070] FIG. 1b shows a cross-section of another embodiment of a sheet used with the embodiment of FIG. 1;

[0071] FIG. 2 shows an embodiment of a system according to the invention which is provided with the pad according to FIG. 1 and a coffee-maker;

[0072] FIG. 3 shows a top plan view of a holder of the coffee-maker according to FIG. 2;

[0073] FIG. 4 shows an embodiment of the system according to FIG. 2 which is further provided with a flexible pad of filtering paper;

[0074] FIGS. 5.1-5.3 show schematically a method for making a sheet used with a pad according to FIG. 1 and the method according to FIGS. 5a-5f

[0075] FIGS. 5a-5f show schematically a method for making the pad as discussed above;

[0076] FIG. 6 shows an elevational view of the second sheet of possible embodiments of the pad according to the invention;

[0077] FIG. 7.1 shows a side elevational view of an apparatus for determining a form-retention of a second sheet of a pad;

[0078] FIG. 7.2 shows a view according to 7.2 of FIG. 7.1;

[0079] FIG. 7.3 shows a view according to 7.3 of FIG. 7.1;

[0080] FIG. 7.4 shows a side elevational view similar to FIG. 7.1 at the moment that a knife is just beginning to touch the pad;

[0081] FIG. 7.5 shows a side elevational view similar to FIG. 7.1 when the knife has reached a lowest position; and

[0082] FIG. 7.6 shows a curve of a measured force during the test.

DETAILED DESCRIPTION

[0083] It has to be mentioned, that specifications mentioned with regard to the second sheet, especially specifications regarding the used material and measures are also applicable with the first sheet, and vice versa. Further it has to be mentioned that all specifications mentioned above and relating to the inventive pad, the use of the pad, the method of preparing a beverage and the methods for making the inventive pad are applicable with the following examples of embodiments.

[0084] In FIG. 1, with reference numeral 1 a pad for use in a coffee-maker is shown, preferably comprising at least one of the before mentioned above specifications. The pad is of a type intended for preparing one or two cups of beverage. A cup of beverage can consist, for instance, of 20-200 ml of beverage, more particularly of 20-180 ml of beverage. The pad 1 is provided with an envelope 2A, 2B with an inner space 4 which is filled with a beverage preparation product 6 which is shown in hatched representation in the drawing. In this example, it holds that the envelope bounds the inner space. The beverage preparation product is intended for preparing a beverage. To this end, the beverage preparation product comprises a product to be extracted with a fluid and/or possibly a product soluble in a fluid.

[0085] In this example, it holds that the beverage preparation product comprises exclusively a product to be extracted with a fluid, more particularly, this concerns ground coffee. The envelope is formed by a first disc-shaped sheet 2A and a second disc-shaped sheet 2B which are interconnected adjacent their longitudinal edges 8. The interconnected parts of the first sheet 2A and the second sheet 2B form a sealing seam 10. The sealing seam therefore has the shape of a ring. The first sheet and the second sheet each form a filter which can pass a fluid and which forms a barrier to the beverage preparation product. This makes it possible that, in use, with a coffee-maker a fluid such as water is supplied under pressure to the pad so that the fluid is pressed through the pad for obtaining a beverage which thereupon leaves the pad again. All this will be discussed in more detail with reference to FIG. 2.

[0086] In this example, it holds furthermore that the second sheet 2B is of form-retaining design. The form retention of the second sheet, according to a test, is expressed in a force, measured during the test, which is exerted on the second sheet, while the test is carried out on the second sheet as such, that is, on the pad without the first sheet and the beverage preparation product; see FIGS. 7.1-7.3.

[0087] For carrying out the test, the second sheet 2B as such, that is, the pad without the first sheet and the beverage preparation product, but with preservation of its shape such as when the second sheet forms part of the pad, is laid on a horizontal surface 100, such that the second sheet is supported by its longitudinal edge 8 on the horizontal surface, while the horizontal surface is provided with an elongated groove 102 which has a width a of 30 mm, and while the second sheet, symmetrically with respect to the groove, overlies the groove and on opposite sides of the groove is supported on the horizontal surface. In carrying out the test use is made of a knife 104 having a length/which corresponds to the diameter D of the pad. A cutting face 106 of the knife has a thickness of 3 mm. A length direction L of the cutting face 106 extends in horizontal direction in a length direction L of the groove. For testing, the knife, from a position above the pad, is moved down in vertical direction V with a constant speed v of 100 mm/minute, while a center M of the cutting face is situated, viewed in vertical direction, above a center of gravity Z of the second sheet. Because the second sheet has the shape of a disc with a center P, this center P corresponds to the center of gravity mentioned. Moving the knife down is carried out with a load cell 108. Prior to carrying out the test, the longitudinal edge 8 lies wholly fittingly against the surface 100. From the moment that the knife touches the second sheet (FIG. 7.4) the resistance in units Newton is measured that the knife experiences as a result of the deforming of the pad by the knife as the knife moves down. In other words, the force is measured that the knife experiences from the second sheet as the knife moves down. Before the knife touches the second sheet, this force is zero. Thereupon this force starts to run up. Moving down is continued until the cutting face of the knife is in the groove at 12 mm depth b with respect to the horizontal surface (see FIG. 7.5). A highest resistance or force measured with the load cell 108 is the measure of the bending stiffness of the second sheet. This highest resistance Fmax is measured in Newton. As the knife moves down and initially touches the second sheet, the second sheet will first deform elastically. Thereafter, upon further downward movement, the second sheet is deformed. The measured greatest force typically corresponds with the moment just before which the second sheet buckles and hence yields under the load of the knife. After buckling the force can decrease again.

[0088] In other words, the force is measured that the knife experiences as a result of the pad deforming. In FIG. 7.6 this force F is plotted as a function of the distance x over which the knife is moved down. From x=x0 the force F starts to rise from F=0. The maximum measured force Fmax is at x=x1. At x=x0+b the knife has reached the point of its maximum downward travel. The measured measure for the form retention of the second sheet is F max.

[0089] The measured greatest force is preferably in the range of 0.2-4 Newton, and/or is preferably greater than 1 Newton.

[0090] In particular, it holds that the second sheet also remains form-retaining when a fluid such as the beverage and/or water is caused to flow through it, while the fluid can have a temperature of at most 80 degrees Celsius. In other words, when the fluid has a temperature that can run up to 80 degrees Celsius, the second sheet keeps the form-retaining properties mentioned.

[0091] More particularly, it holds here that the second sheet remains form-retaining when a fluid is caused to flow through it, while the fluid can have a temperature of at most 90 degrees Celsius and preferably at most 99 degrees Celsius.

[0092] In this example, it holds that the second sheet is made of a thermoplastic material. A thermoplastic material is a material that becomes more plastic as the temperature rises. Accordingly, it holds in this example that the second sheet also remains form-retaining when it comes into contact with a fluid such as a beverage and/or hot water that has a temperature of 80 degrees Celsius. Because a thermoplastic material is involved here, it will also hold that the sheet remains form-retaining when it comes into contact with a fluid having a temperature that is lower than 80 degrees Celsius.

[0093] More particularly, it holds that the second sheet also remains form-retaining when it comes into contact with a fluid of 90 degrees Celsius and preferably of 99 degrees Celsius. What is involved then, as mentioned, is a second sheet that is made of a thermoplastic material.

[0094] In this example it holds that the nonwoven material has been made form-retaining through a heat treatment. This means that the sheet-form material is brought into the required shape such as it is shown for the second sheet 2B, after which the second sheet undergoes a heat treatment so that the second sheet after cooling becomes form-retaining.

[0095] The thickness of the second sheet in this example is in the range of 50-600 micrometer. Preferably, it holds that the thickness is in the range of 100-500 micrometer, more particularly in the range of 150-300 micrometer. The thickness mentioned is schematically denoted in FIG. 1 with the letter h. The thickness of the first sheet 2A is, for example, 1.4-10 times smaller than the thickness of the second sheet 2B. The thickness mentioned is schematically denoted in FIG. 1 with the letter h′.

[0096] As can be seen in FIG. 1, it holds that the part of the second sheet that is within the contours of the sealing seam is of dish-shaped design. Also, it holds in this example that the first sheet is of flat design. The part of the second sheet that is within the contours of the sealing seam, as shown in FIG. 2, has a diameter denoted with d. The diameter of the whole pad is denoted with D in FIG. 2. Also, this means that the ring-shaped sealing seam 10 has a diameter of (D−d)/2. In this example, D is approximately 74.4 mm and d is approximately 61 mm. Other dimensions are conceivable for D. D can be, for instance, in the range of 45-90 mm, preferably 70-80 mm, more preferably 73-76 mm, in particular approximately 74.4 mm.

[0097] As shown in FIG. 1, the pad 1 comprises two sheets, a first sheet 2A and a second sheet 2B, wherein each sheet comprises at least one layer, and wherein at least one of the first sheet and the second sheet, here the second sheet 2B, is of form-retaining design, made of at least one base compound comprising meltable polymers and preferably fibers and/or filaments of the same, and at least one enforcement compound comprising at least meltable polymers of the group of abaca, banana plant, flax, hemp, lyocell, tencel, kenaf, nettles, ramie, bamboo, bowstring, indian hemp, jute, cotton, coir, sisal, agave and preferably fibers and/or filaments.

[0098] As shown in FIG. 1a and FIG. 1b the above at least two different compounds can be in multiple ways for providing the form retaining sheet 2B. This has also been explained in the general part above and here fully applicable. In a first embodiment and shown with FIG. 1a the sheet can comprise of at least one first layer 5 comprising at least one base compound without an enforcement compound and at least one second layer 7 comprising at least one enforcement compound. It preferably holds that also the second layer 7 comprises at least one base compound. Here the enforcement compound is connected with at least one base compound, e.g. PLA or one of the above mentioned meltable polymers to form the layer 7 being applicable on the first layer 5. Preferably the second layer 7 bonded to first layer 5 or vice versa, and further, like also shown in FIG. 1 and 1a, bonded to the outside of the first layer, facing away from the inner space 4 of the pad 1. Like mentioned above it is also possible that the at least one sheet is comprising multiple of the first layers 5 and/or of the second layers 7, wherein preferably at least one first layer is arranged between at least two second layers and/or vice versa.

[0099] In a second embodiment and shown with FIG. 1b the sheet 2B can comprise of at least one first layer 5 comprising at least one layer 5 comprising a preferably homogeneous mixture of the at least one base compound and the at least one enforcement compound. The mixture can also be applied in a non-homogeneous way, e.g. with a higher density of the enforcement compound in the area of the layer facing away from the inner space 4 of the pad 1, etc.

[0100] As mentioned it is also possible to arrange multiple of the above layers and of the layers described in the above general part adjacent with each other. Further especially all the materials, especially the plastics, celluloses, woven and nonwoven material mentioned in the above general part are applicable.

[0101] In FIG. 2 a system is shown in which the pad of FIG. 1 is used. The system is provided with a coffee-maker 14 which is provided with a holder 16 for receiving the pad 1. Further, the coffee-maker is provided with a cover 18 for closing off the holder 16. The coffee-maker is furthermore provided with fluid means 20, 22 for generating a fluid flow under pressure. In this example, these fluid means consist of a pump 20 and a storage vessel 22 which is filled with a fluid, in this example with hot water. The temperature of the water can be, for example, 70-98 degrees Celsius. To that end, the storage vessel 22 is provided with a heating element 24. The storage vessel 22 itself in turn may be filled from a larger storage vessel, which comprises cold water. This larger storage vessel is not shown in the drawing. The pump 20, in use, supplies hot water via a duct 26 to an inner space 28 of the cover 18. A bottom 30 of the cover is provided with a multiplicity of inflow openings 32. The holder 16 is provided with a bowl-shaped inner space 36 which is bounded by a bottom 34 of the holder and an upstanding sidewall 38 of the holder. The bottom consists of an outer horizontally directed ring-shaped bottom part 40 which adjoins the sidewall 38. Furthermore, the bottom comprises an inner dish-shaped bottom part 42, while the dish-shaped bottom part adjacent the ring-shaped bottom part slopes downwards in a direction directed away from the sidewall, to the inside of the holder. The ring-shaped bottom part is provided with an outer edge 41 which adjoins the sidewall 38 and an inner edge 43 which adjoins the dish-shaped bottom part 42. The bottom is provided with at least one outflow opening 44. This outflow opening in this example is located in the dish-shaped bottom part 42. As shown in FIG. 2, it holds that the pad 1 rests on the bottom 34, with the second sheet extending along the bottom to near the upstanding sidewall 38. The sealing seam 10 of the pad then rests on the ring-shaped bottom part 40. As can be seen, the second sheet has a shape that corresponds to the shape of the bottom of the holder. The second sheet here has a smoothly running inner and outer surface within the sealing seam. In this example, it holds furthermore that in the dish-shaped bottom part 42 grooves 46 are provided. The grooves extend exclusively under the beverage preparation product 6 in the pad. In this example, it holds that the grooves 46 are formed by a multiplicity of projections 54 of the bottom. Between the upstanding projections 54, the respective grooves are formed. According to the invention, the grooves may also be differently formed, for instance as slots provided in the bottom and extending, for instance, in radial direction towards the outflow opening 44. The bottom is at least partly of smooth design and is made of a plastic and/or metal. The upper sides of the tops are smooth, just like the rest of the bottom. In this example, it holds that the beverage preparation product is ground coffee. As can be properly seen, the ground coffee 6 forms a coffee bed. The grooves are under the coffee bed but also within the contours of the coffee bed, i.e., within the contours of the positions where the beverage preparation product is situated in the pad. The dish-shaped bottom part comprises an inner flat bottom part which is denoted with d′ in FIG. 2. As can be seen, the grooves extend exclusively in this inner bottom part d′ which is flat. Further, it holds that the at least one outflow opening 44 is provided with a nozzle 46 for generating a jet of the beverage as will be further elucidated hereinafter. To this end, the system is further provided with an impact member 50 which, in use, is impacted by a jet of the beverage made. The working of the system described up to this point is as follows.

[0102] A user will first of all remove the cover 18 for placing the pad 1 of FIG. 1 in the holder 16 of FIG. 2. Because the pad is provided with the second sheet 2B which is form-retaining, the pad will of itself slide into the right position as the pad is positioned in the bottom. The pad is, as it were, self-locating and ends up in the position as shown in FIG. 2. After this, the holder can be closed off with the cover as shown in FIG. 2. Thereupon a user operates the control unit 52 of the coffee-maker 14. The result is that the control unit 52 activates the pump 20. As a result, hot water is supplied from the storage vessel 22 via the duct 26 to the inner space 28 of the cover 18. This water will leave the cover 18 and flow into the holder via the inflow openings 32. The consequence is that the water is supplied under pressure from the upper side of the pad to the first sheet of the pad. The pressure in this example is 1.1 bar above atmospheric pressure. The hot water will then penetrate via the first sheet 2A into the inner space of the pad. Here, the hot water comes into contact with the ground coffee so that the coffee beverage is formed. The coffee beverage leaves the coffee pad via the second sheet 2B. As a result of the second sheet 2B becoming moist, it will form a sealing with the bottom 34, there where there are no grooves. There where the grooves are, the beverage will leave the pad. As a result of the grooves extending exclusively under the coffee bed, bypass is avoided. What is further avoided is that the hot water forms channels extending in vertical direction through the coffee bed. Such channels would preclude an optimal and efficient extraction of the ground coffee. Since, in addition, the grooves extend in a flat part of the bottom, this enables the second sheet to properly abut the bottom, so that it's the grooves that determine where the beverage can flow out of the pad. The beverage proceeds to flow via the grooves to the outflow opening 44. Because the outflow opening 44 is provided with a nozzle 47, while moreover it holds that the fluid is supplied to the pad under pressure, the coffee beverage will be formed into a jet that impacts the impact surface 50. As a result, the beverage will be atomized in a chamber 62 of the holder which is open at its underside 64. When the beverage is thereupon received in a cup, a beverage is obtained with a fine-bubble foam layer. After preparation of the beverage, the holder can be opened again by removing the cover. The pad 1 can then be removed easily in that the second sheet is still form-retaining.

[0103] In this example, it holds that the cover is provided with a sealing ring 60 which seals fluid-tightly against the upstanding sidewall 38 of the holder. It is also possible, however, that the upstanding sidewall 38 is provided with the sealing ring, this sealing ring then sealing against the cover 18. In this example, the second sheet is of form-retaining design. It is also possible, however, that the first sheet is also of form-retaining design. Preferably, it holds here that the first sheet is made of a same material as the second sheet. More particularly, it holds here that the first sheet and the second sheet are made from a same sheet or same sheets. In this example, the beverage preparation product consists of ground coffee. It is also conceivable, however, that the beverage preparation product consists of, for example, tea. (Furthermore, it is possible that the beverage preparation product consists of a product soluble in fluid or a product that forms a dispersion such as milk powder and/or cacao for preparing milk or chocolate milk.) It is also conceivable that the beverage preparation product is provided with one of the extractable products mentioned or a different type of extractable product in combination with a fluid-soluble product. The fluid-soluble product in turn may consist of milk powder or a flavor enhancer. Also, it is conceivable that the pad is used in a different type of coffee-maker. Further, in the holder of the coffee-maker of FIG. 2, also a coffee pad 1′ according to FIG. 4 may be placed, which is provided with an inner space which is filled with ground coffee, while the inner space is formed by a top sheet 2A′ and a bottom sheet 2B′ which are interconnected adjacent their longitudinal edges, while the top sheet and the bottom sheet also form an outer side of the pad and are each made from flexible filtering paper. The coffee pad 1′ and the holder 16 are tailored to each other so that the coffee pad can be received in the holder for preparing coffee, such that, in use, the fluid is supplied under pressure to the upper side of the pad and is pressed through the pad so that the fluid flows through the top sheet whereby in the pad a coffee extract is formed which proceeds to leave the pad via the bottom sheet and wherein the coffee extract proceeds to flow out of the holder via the beverage outflow opening of the holder. The bottom sheet of the pad here extends over the bottom 34 of the holder up to the upstanding sidewall 38 of the holder, thereby also forming a sealing with the holder to prevent bypass. The beverage can leave the pad there where the grooves are. Accordingly, the invention also concerns a system provided with the coffee-maker, the pad 1 and the pad 1′, allowing a user, as desired, to use the pad 1 or the pad 1′ for preparing the beverage.

[0104] FIGS. 5a-5f schematically show a method for making the pad as discussed above, wherein FIGS. 5.1-5.3 show a method for making a sheet e.g. used with a pad according to FIG. 1 and the method according to FIGS. 5a-5f.

[0105] As shown in FIG. 5.1, a layer 5, comprising e.g. a base compound, like e.g. plastic polymers of the group of PE, PET, PETP, coPET, LLDPE, CPP, PLA and/or PP PLA and as mentioned already in the above general is provided. This layer can also e.g. be a filtering paper, a carton, a foil etc. By use of an application apparatus 9, e.g. a spraying means, a deposition means, a fluid curtain etc. a second layer 7 comprising at least one of the above enforcement compound is applied. This process can be a wet laying process, a dry laying process, a dip moulding process, a dilution forming moulding process, a spray-up moulding process, a pressing process etc.

[0106] As shown in FIG. 5.2, the applied second layer 7 or the whole produced sheet 2B is dried by use of drying means, e.g. infrared-applications means, hot-air application means, heating means or similar drying means. It is also possible to dry the applied enforcement layer and binder material respectively without these means, e.g. by air-drying.

[0107] As shown in FIG. 5.3 after the drying step, a form-retaining sheet material, here having two layers, and referred to as a fourth sheet 50 in the following, is provided. The same or a similar process can be used or providing a single layer sheet having e.g. a mixture of base and enforcement compound(s). In general all known methods for providing a single or a multiple layer sheet of woven or nonwoven compounds are applicable for providing the sheet used for making the inventive pad 1.

[0108] As shown with FIG. 1a and further explained for the method according to FIGS. 5a-5f, the produced sheet 2B; 50 is further processed to a pad 1, wherein here e.g. the sheet 2B; 50 is arranged in such a way that the second layer 7, comprising the enforcement compound is arranged on the outside of the pad 1. It is also possible to arrange the sheet(s) in such a way that the a layer comprising the enforcement compound is situated on the inside, i.e. within the inner space 4, being in contact with the beverage preparation product 6. It is also possible to provide it on both sides of the sheet.

[0109] In FIG. 5a it is shown that the fourth sheet 50 obtained e.g. by the method explained before is placed above a mold 52 made of metal. Through, for instance, vacuum suction of the mold cavity 54, the fourth sheet takes the shape of the mold cavity (FIG. 5b). Also, alternatively, the fourth sheet may be mechanically pressed into the mold cavity with a stamp 56 (represented in broken lines). Then, in FIG. 5c, for further enforcing the following steps can be performed: The fourth sheet is heated with a stamp 58. The fourth sheet is heated to, for example, 200-400 degrees Celsius. (The fourth sheet may also be heated in step c. to a temperature of 90-200 degrees Celsius, in particular when the second sheet is made of PLA.) The plastics in the sheet will thereby liquefy and/or soften. After this, the stamp 58 is removed and the fourth sheet is cooled. The sheet has now become form-retaining. The second sheet in this example will now already have a smoothly running inner and outer surface within the sealing seam to be formed.

[0110] Thereupon, the beverage preparation product 6 is positioned on the fourth sheet (FIG. 5d). Next, a third sheet 60 is placed above the fourth sheet 50 and the beverage preparation product. By means of a ring-shaped heating element 62, the fourth sheet and the third sheet are welded together (FIG. 5f), whereby the sealing seam 10 is formed. Next, with a ring-shaped die 64 the pad 1 is cut out. Alternatively pre-cut sheets can be provided. The cut-out part of the fourth sheet 50 then constitutes the second disc-shaped sheet 2B and the cut-out part of the third sheet 60 then constitutes the first disc-shaped sheet 2A. Accordingly, it holds that in a step a. a set-up of a third sheet, fourth sheet and the beverage preparation product is made, with the beverage preparation product situated between the third sheet and the fourth sheet (FIG. 5e), and then in a step b. the third sheet and the fourth sheet are joined together (FIG. 5f). Further, it holds that the fourth sheet is optionally heated in a step c. (FIG. 5c) and then is optionally cooled in a step d. for further increasing the bending stiffness of the fourth sheet.

[0111] Further, it optionally holds that the fourth sheet is heated in step c. to a temperature of 200-400 degrees Celsius or for instance 90-200 degrees Celsius. In a step e. the fourth sheet is placed in a mold so that the fourth sheet obtains a predetermined shape (FIG. 5b), while thereupon step c. (FIG. 5c) is carried out. In a step f. the beverage preparation product is placed on the fourth sheet, preferably while the fourth sheet is already in the mold (FIG. 5d), whereby step b. is carried out after step f. It also holds in this example that step c. (FIG. 5c) is carried out before step f. (FIG. 5d). The third sheet and/or the fourth sheet may during the execution of step b. be heated to 90-400 degrees Celsius, in particular 90-200 degrees Celsius. Also, it holds that the fourth sheet and possibly the third sheet are cooled after carrying out step b.

[0112] It is also possible, however, that step b. and step c. are carried out at the same time. This can be done by leaving out the step of FIG. 5c while in FIG. 5f the mold is heated for carrying out step c.

[0113] Such variants are each understood to be within the purview of the invention. Thus, it is also possible to make the fourth sheet more form-retaining by calendering and/or deep drawing it in a step g. before the step according to FIG. 5a is carried out. After this, the method can be continued as has been discussed with reference to FIGS. 5a-5f. This means that calendering and/or deep drawing in step g. is carried out before step a. and step b. It is also possible that only the steps of FIGS. 5a, 5b, 5d, 5e, and 5f are carried out. Accordingly, the step c. of heating and the step d. of cooling are then omitted.

[0114] Also, still other embodiments of the pad are conceivable.

[0115] The invention is by no means limited to the embodiments outlined. Thus, the second sheet can also comprise a foil and/or consist of a foil which is provided with a multiplicity of outflow openings and is made of a plastic. The outflow openings can for instance be circular and have a diameter of 0.15-0.6 mm. The plastic may be of a kind as discussed above. Also, it is conceivable that the second sheet comprises a first layer which consists at least substantially of PETP and a second layer which consists at least substantially of CPP. By heating the foil of the above-outlined kinds and bringing it in a desired shape and/or by appropriately choosing the thickness of the foil, the form retention of the second sheet can be adjusted to the desired level. Production of the pad can then take place as has been discussed with reference to FIG. 5. Also, first sheet may be composed from such a foil and a layer of woven or nonwoven material, such as, for example, filtering paper. This layer of nonwoven material can also consist of the nonwoven material which has been discussed above for the second sheet of the pad according to FIG. 1. This layer may be bonded to the foil by, for instance, heating. In addition, it holds for each of the above-outlined embodiments that the beverage preparation product may be tamped down and/or condensed, and thereby contributes to the form retention of the pad. Such tamping down and/or compaction may be carried out, for instance, in the situation of FIG. 5d, after which the pad is closed with the first sheet as discussed for FIGS. 5e and 5f. In each embodiment the beverage preparation product may be provided with ground coffee.

[0116] In each of the embodiments outlined, the first and/or the second sheet 2A; 2B may have a smoothly running inner and outer surface within the sealing seam. However, the first and/or the second sheet may also be so configured as to be provided with at least one groove or a multiplicity of grooves to increase form retention of the sheet, with the grooves 80 extending, for instance, in radial direction of the pad and/or with the at least one groove 90 constituting a circumferential groove closed upon itself, extending around an axial axis of the pad, for example in the sealing seam (groove 90.1) or in the second sheet inside an area enclosed by the sealing seam 10 so that the pass of extension of the groove (90.2) has a smaller diameter than the sealing seam.

[0117] This is shown in FIG. 6 in which a view of the second sheet is shown. The radial grooves 80 preferably extend to near the sealing seam 10. It is also conceivable, however, that the radial grooves extend into the sealing seam 10 (indicated for one groove 80.1). Further the grooves can be arranged extending to a center C of the sheet and preferably intersecting each other. It is also possible to provide the grooves on a bowl-shaped sheet, like the second sheet 2B in an arrangement similar to a cup of a cup-cake, wherein grooves are extending primarily at inclined side walls preferably extending into the sealing seam. Preferably a bottom portion of the bowl-like formed sheet does not comprise grooves. This bottom portion is preferably basically flat. The grooves can be provided as alternating inward and outward grooves, oscillating with regard to the plane of the sheet in alternating directions, especially when seen in an annular cross section along a wall portion extending to the sealing seam.

[0118] The grooves in this example have a V-shaped cross section. Other shapes, such as a U-shaped cross section, are also possible. By providing the mold 52 with such grooves and providing the stamp 56 with ribs corresponding to these grooves, the fourth sheet and hence the second sheet can be provided with the respective grooves 80, 90 by carrying out with such a mold and stamp, as desired, one of the methods which have been discussed with reference to FIG. 5.

[0119] In principle all mentioned specifications and embodiments explained above and especially explained in the above general part can be applied with the embodiments shown in the enclosed figures, either in combination or independently of each other.

[0120] In the foregoing specification, the invention has been described with reference to a specific embodiment of the invention. It will, however, be evident that various modifications and changes may be made therein without departing from the broader spirit and scope of the invention as set forth in the appended claims.

[0121] However, other modifications, variations and alternatives are also possible. The specifications, drawings and examples are, accordingly, to be regarded in an illustrative rather than in a restrictive sense.

[0122] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word ‘comprising’ does not exclude the presence of other features or steps then those listed in a claim. Furthermore, the words ‘a’ and ‘an’ shall not be construed as limited to ‘only one’, but instead are used to mean ‘at least one’, and do not exclude a plurality. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to advantage.