PRESS FOR SQUEEKING OUT LIQUID-CONTAINING SUBSTANCES

Abstract

A press (1) for pressing liquid-containing material (2), in particular grapes, comprises a flexible, liquid-tight, sack-shaped press container (10) with a juice outlet (14) formed on its bottom (10b) which can be closed by a juice drain valve (12) and a pressure medium chamber (30) formed on its outer wall (10a) which includes a circumferential, self-contained air chamber (32) which can be filled with compressed air via a valve (34), a sack-shaped inner container (40) made of liquid-permeable flexible mesh fabric which can be inserted into the interior of the sack-shaped press container (10) and which can be filled with material (2), and closure means (50) with which the sack-shaped press container (10) can be closed in a substantially liquid-tight manner after the sack-shaped inner container (40) has been inserted. The invention further relates to a method for pressing liquid-containing material (2) using such a press (1).

Description

[0001] The invention relates to a press for pressing out liquid-containing substances, in particular agricultural and chemical products, according to the preamble of claim 1.

[0002] Presses for extracting liquids are known, for example, from EP 1438185 B1 and are used to extract grape juice, used as a raw material for the production of wine or fruit juice, from grapes or fruit placed in the press. The press described in EP 1438185 B1 has a closed, elongated, rigid cylindrical container that can be rotated about its horizontal longitudinal axis. The interior of this container is divided by at least one press membrane into a pressure chamber and a pressing chamber. The pressing chamber contains a drainage element made of flexible mesh, hereinafter also referred to as a flexi-drain, and the material to be pressed is placed in this pressing chamber. The use of a rigid press container is very complex and expensive due to the high pressing pressures, sometimes exceeding 1 bar, and cleaning the container is comparatively laborious.

[0003] WO 2022 / 069140 A1 describes a press of this type with a flexible press container in which a drainage element is arranged and which is held in a rotatable support frame to loosen the material to be pressed between pressing operations, which is also referred to as "crumbling".

[0004] Furthermore, WO 2022 / 069139 A1 discloses a modular press in which the press containers with drainage elements incorporated within them are designed as modules, which are filled directly in the vineyard during the grape harvest and then transported to a central processing plant where the actual pressing process and the subsequent processes take place.

[0005] The difficulty with the two presses described last is that the container must be inserted into a rotating frame. Furthermore, the container can only be closed manually using screws or clamps, which makes automation difficult; and the lid openings are comparatively small, and significant deflection forces sometimes occur when the containers with the mash or pomace inside rotate.

[0006] Finally, the known presses also have numerous parts attached to the press container, such as the lid, the frame, the pressure vessel itself, the flexible drainage elements with clamping, etc., which must be transported with each container from the filling point to the further processing facility.

[0007] Accordingly, it is an object of the present invention to create a press and a method with which the disadvantages described above are avoided.

[0008] According to the invention, a mobile transport and pressing container comprises a flexible, liquid-tight, sack-shaped pressing container, hereinafter also referred to as a "juice bag," made of a flexible, non-elastic material, in particular PU-coated fabric, which can be closed in a substantially liquid-tight manner by means of a closure device. Preferably, a juice drain with a manually or motor-operated juice drain valve is arranged at the bottom of the liquid-tight, sack-shaped pressing container, through which the juice pressed from the material being pressed is discharged.

[0009] The flexible, liquid-tight, sack-shaped press container is surrounded by a pressure medium chamber formed on its outer wall, which includes a circumferential, self-contained air chamber that can be filled with compressed air via a valve.

[0010] Although the pressure medium chamber can also be formed as a separate, independent element, for example as a self-contained annular chamber made of foil material, it preferably comprises an airtight flexible woven film made of the same PU-coated woven material, attached to the outside of the bag-shaped press container, which is connected airtight to the outer wall of the bag-shaped press container by thermal welding or bonding along a circumferential weld or bond seam.

[0011] The press according to the invention further comprises a sack-shaped inner container made of liquid-permeable flexible mesh fabric, which can be inserted into the interior of the sack-shaped press container and which can be filled with material to be pressed, such as grapes or fruit. The upper opening of the drainage bag, through which the material to be pressed is filled, is preferably closable by further closure means in the form of a zipper, which serves to enclose the material to be pressed in the drainage bag during the pressing process without it, in particular the grape seeds contained therein, being able to enter the interior of the sack-shaped press container.

[0012] This allows the drainage bag, along with the material being pressed, to be removed as a unit from the juice bag after pressing and transported to a disposal point. There, after opening the zipper, it can be emptied by turning it inside out. The flexible mesh of the drainage bag is preferably the same material that has long been used for the drainage elements in the aforementioned prior art presses. It has a mesh size that is smaller than the diameter of the cores of the material being pressed.

[0013] The press according to the invention has the following further advantages: 1. The bag-shaped flexible liquid-tight press container and the bag-shaped inner container (drainage bag) are very easy and inexpensive to manufacture, as this only requires thermally welding corresponding sections of film together or sewing sections of screen fabric together. 2. Due to the integral design of the juice bag and pressure medium chamber, the pressure medium chamber is part of the device itself and does not need to be transported. 3. The drainage area is increased and vertical juicing is maintained. 4. The volume of the sack-shaped press container is variable, particularly the volume that must be pressurized by the pressure medium, especially compressed air or inert gas. This reduces the required air volume. It also allows for the particularly efficient and economical processing of small quantities, for example, of very high-quality grapes. 5. The pressing surface on the mash is flexible. This minimizes shear forces during pressing. As the applicant found in pressing trials in direct comparison with a conventional membrane press of the type mentioned above, this results in significantly fewer suspended solids in the pressed juice. 6. It is possible to circumvent the Pressure Equipment Directive by using several smaller pressure medium chambers in parallel or by using a maximum pressure of less than 500 mbar. 7. The space required for this press is minimal compared to a membrane press of the type mentioned earlier with a fixed press container, as the flexible, bag-shaped juice container and the bag-shaped inner container can be folded / collapsible for storage after harvesting. These can also be folded for space-saving transport to the harvesting site, where they can be filled with grapes on-site. This allows for the extremely gentle collection of hand-picked grapes in the juice container / inner container and, by introducing compressed air into the press chamber using a mobile air generator or a tractor-driven compressor, very gentle pressing with minimal air pockets on-site. 8. It is also possible to forgo rotating the press container after each pressing operation, which significantly reduces the equipment effort and operating costs.

[0014] A preferred embodiment of the press is characterized in that the circumferential fabric film, or more precisely the circumferential film strip, is attached centrally to the bottom of the sack-shaped container, particularly at the juice outlet, and connected to the outer wall of the sack-shaped press container along a circumferential welded or glued seam. This seam is advantageously positioned between the top of the side wall of the sack-shaped press container and approximately in its center, such that when the pressure chamber is pressurized, the flexible outer wall of the sack-shaped press container, together with the juice outlet and the sack-shaped inner container made of liquid-permeable mesh (drainage bag), is moved upwards by the expanding pressure chamber.

[0015] For this purpose, the height of the inner wall section of the sack-shaped press container between the circumferential welded or glued seam and the bottom juice outlet, where the wall material of the sack-shaped press container and the circumferential fabric film are preferably connected to each other via a clamping flange, is smaller than the height of the radially outer wall section of the fabric film, which extends from the welded or glued seam to the bottom juice outlet.

[0016] As the applicant discovered through experiments, the previously described design and specific geometry of the sack-shaped press container, along with the pressure chamber formed by the circumferentially welded / glued foil strip, result in a force pulling the juice bag upwards during pressure build-up in conjunction with the mash. This force causes the bottom of the sack-shaped press container, including the juice outlet, to be increasingly pulled upwards as the pressing pressure in the pressure chamber increases. Consequently, during the subsequent pressure release, the lowering of the bottom causes the inner wall of the sack-shaped press container to move relative to the wall of the inner sack-shaped container and the material being pressed. Surprisingly, this movement leads to a beneficial loosening of the material being pressed, without the need for additional mechanical devices acting on it.The loosening of the pressed material, which is partially clumped together locally due to the pressure forces acting during the pressing process, is subsequently also referred to as "crumbling" the mash.

[0017] In a further embodiment of the invention, the protruding part of the sack-shaped press container can be provided at its upper edge with keder tubes or half-tubes, preferably made of plastic, which are preferably foldable and form the sealing means. These can be pressed together in a substantially airtight and liquid-tight manner by a clamping handle similar to that of a pliers or scissors, in particular a self-locking one, which is preferably suspended from the lifting forks of a forklift or other lifting device such as a small crane or hoist, or even a fixed frame, in order to close the sack-shaped press container after the material to be pressed has been filled into the drainage bag, which was previously inserted into the interior of the sack-shaped press container, and the drainage bag has been closed by means of the zipper.

[0018] In this embodiment, eyelets can also be attached to the sack-shaped, liquid-tight, flexible press container, which serve to allow the opening of the same to be tied shut with the help of tension straps or ropes together with the clamping handle.

[0019] The entire assembly is then lifted using a forklift or other lifting device, and compressed air is introduced into the pressure chamber via a valve. As pressure builds up in the pressure chamber, the liquid-tight, flexible press container (juice bag) presses against the inner container (drainage bag). This is facilitated on the outside of the inner container by optionally inserted, essentially vertically oriented spacer cords or plastic tubes, causing the juice to flow downwards to the juice drain at the bottom. From there, it flows through the juice drain valve, which is open during the pressing process, into a juice collection container, in particular a juice tray, where it can be collected.

[0020] A particular advantage of the press according to the invention is that, unlike the previously mentioned known membrane presses with rigid press chambers, it does not require a vacuum blower to apply the press membrane, but only a compressed air connection. This advantageously saves the time required in the aforementioned membrane presses to apply the membrane to the inner wall of the press chamber.

[0021] Further features of the invention are contained in the dependent claims.

[0022] The invention is described below with reference to the drawings and by way of preferred embodiments.

[0023] The drawings show: Fig. 1 a schematic cross-sectional view of the press according to the invention, held by a lifting device, after filling with the material to be pressed and closing the drainage bag and juice bag, Fig. 2 the press of Fig. 1 during the pressing process after the pressure medium chamber has been pressurized with compressed air, Fig. 3 a preferred embodiment of the sack-shaped inner container made of liquid-permeable flexible sieve fabric used in the press according to the invention, Fig. 4a a schematic representation of an additional drainage element that can be inserted into the inner container, Fig. 4b a schematic representation of the sack-shaped inner container with an additional drainage element inserted therein, Fig. 5.1 - 5.5 the different successive process steps in carrying out a preferred embodiment of the pressing process according to the invention, Fig. 6.1 - 6.4 the different successive process steps in emptying the sack-shaped inner container made of liquid-permeable flexible sieve fabric, and Fig. 7.1 - 7.4 the different successive process steps in the mechanical processing of grapes with a press according to the invention.

[0024] As in the Fig. 1 and Fig. As shown in Figure 2, a press 1 for pressing liquid-containing material 2, in particular grapes, comprises a flexible, liquid-tight, sack-shaped press container 10, at the bottom 10b of which a juice drain 14 is formed, which can be closed by a juice drain valve 12. A pressure medium chamber 30 is formed on the outer wall 10a of the sack-shaped press container 10, which includes a circumferential, self-contained air chamber 32 that can be filled and vented with compressed air via a valve 34. Inside the interior of the sack-shaped press container 10, a similarly sack-shaped inner container 40 is arranged, which preferably consists entirely of liquid-permeable, flexible mesh fabric.The sack-shaped inner container 40, which can be removed upwards from the interior of the press container 10, can be filled with material to be pressed 2 through its opening and can be closed by means of a zipper 42 or other closing means after the material to be pressed 2 has been filled, in such a way that no kernels of the material to be pressed 2 escape during the process. Fig. The pressing process shown in Figure 2 allows the material to pass through the zipper 42 into the sack-shaped press container 10 and from there into the juice outlet 14. After the material to be pressed 2 has been filled into the sack-shaped inner container 40 and the zipper 42 has been closed, the opening of the press container 10 is also closed by a sealing device 50, which will be discussed in more detail below.

[0025] As the representation of Fig. 1 and Fig. 2 can be further removed, the pressure medium space 30 comprises an endless film 33 made of flexible, air-impermeable fabric arranged on the outside of the sack-shaped press container 10, which is connected airtight to the outer wall 10a of the sack-shaped press container 10 by thermal welding or bonding along a circumferential weld or bond seam 11.

[0026] The circumferential fabric film 33 is preferably attached centrally to the bottom 10b of the sack-shaped container 10, particularly at the juice outlet 14, and connected to the outer wall 10a of the sack-shaped press container 10 along the circumferential welded or glued seam 11 in such a way that the circumferential welded or glued seam 11 is located between the top of the outer wall 10a of the open sack-shaped press container 10 and approximately its center. This has the advantage that, when the pressure medium chamber 30 is pressurized, the flexible outer wall 10a of the sack-shaped press container is moved upwards by the expanding pressure medium chamber 30 together with the juice outlet 14 and the sack-shaped inner container 40 made of liquid-permeable mesh fabric.

[0027] This effect of the lifting of the container bottom 10b, which loosens the mash after a pressing process when aerating the pressure medium chamber 30, is particularly pronounced when the height of the wall section 10a of the sack-shaped press container 10 between the juice outlet 14, or the bottom 10b and the circumferential welded or glued seam 11 is less than the height of the radially outer wall section of the pressure medium chamber 30 made of woven film 33, which extends from the welded or glued seam 11 to the juice outlet 14.

[0028] In the preferred embodiment of the press 1 according to the invention, the closure means 50 comprise a first, in particular tubular, keder 52 received in a first partial section 10.1 of the upper edge 10c of the flexible, liquid-tight, bag-shaped press container 10, which is designed to hold the liquid-tight, bag-shaped press container 10 in an open position when, as in Fig. 5.1 shown, is held by a clamping handle 60 encompassing the subsection 10.1.

[0029] The closure means 50 further comprise a second, in particular semi-tubular, bead 54, which is preferably designed to be complementary to the bead 52 and is arranged in a second subsection 10.2 of the upper edge 10c opposite the first subsection 10.1. In this case, the second subsection is configured to engage with the first subsection 10.1, so that the two subsections 10.1 and 10.2 are essentially / almost liquid-tight against each other when they are mechanically pressed together and into each other by the clamping handle 62 of a lifting device 92.

[0030] After the openings of the bag-shaped inner container 40 filled with material to be pressed and of the flexible, liquid-tight, bag-shaped press container 10 have been closed, the pressure medium chamber 30 is pressurized with compressed air, causing it to press against the outer wall of the press container 10 and the resulting pressure being transferred via this wall and the screen fabric of the wall of the bag-shaped inner container 40 to the material to be pressed, as shown in Fig. 2 is indicated. During this pressing process, the liquid, i.e., in the case of grapes, the grape juice, is introduced through the sieve fabric of the drainage bag 40, as well as the juice outlet 14 and the open juice outlet valve 12, into a juice collection container 60, which is preferably arranged directly below the press container 10 held by the lifting device 42.

[0031] To further promote juice flow during the pressing process, at least one drainage element 70 made of flexible mesh can optionally be arranged in the sack-shaped inner container 40 made of liquid-permeable mesh, in the interior of which, communicating with the juice outlet 14, support elements in the form of tubes, spirals or rods 72 can be arranged, as is done in Fig. 4a is indicated. For this purpose, one upper end 74 of the additional drainage element 70 can be closed by a quick-release fastener 76, whereas the other lower end 78 of the drainage element 70 is attached above the juice outlet 14 to the bottom 10b of the flexible liquid-tight sack-shaped press container 10, such that the interior of the drainage element 70 communicates with the juice outlet 14.

[0032] To further improve juice flow even at low pressing pressures of, for example, only 0.5 bar, a vibration generator 80, in particular a vibration motor or a preferably motor-driven tapping device, can also be arranged on the outside of the flexible, liquid-tight, sack-shaped press container 10. This in Fig. 1 and Fig. 2 schematically indicated vibration generators act on the pressure medium chamber 30 or the juice outlet 14 during the pressing process with pulsating pressure waves, which spread in the endlessly rotating chamber and whose frequency and / or amplitude can preferably be changed in order to obtain an optimal juice flow.

[0033] Furthermore, to improve juice flow at a given pressing pressure, essentially vertically extending spacer cords or plastic tubes can be arranged between the inner wall of the flexible liquid-tight sack-shaped press container 10 and the outer wall of the sack-shaped inner container made of sieve fabric, which during the pressing process provide a dead space extending along the spacer cords or tubes to the juice outlet 14 between the sieve fabric and the inner wall of the flexible liquid-tight sack-shaped press container 10, through which the juice emerging from the pressing material 2 can flow to the juice outlet 14.

[0034] According to a further concept underlying the invention, a method for pressing liquid-containing material 2, in particular grapes, using a previously described press 1, is characterized by the following process steps, which are preferably carried out in the order specified below, as shown in the Fig. shown in sections 5.1 to 5.4. - Opening the sack-shaped press container 10 and the sack-shaped inner container 40 inserted into it at the top ( Fig. 5.1), - Filling the material to be pressed 2 into the opened sack-shaped inner container 40 ( Fig. 5.1), - Closing the sack-shaped inner container 40 and the sack-shaped press container 10 by means of the further closing means 42 and the closing means 50 ( Fig. 5.2) and - Pressurizing the pressure medium chamber 30 with a pressurized gas, in particular compressed air, wherein the juice flowing over the juice outlet 14 is collected in a juice collection container 60, which is arranged directly below the juice outlet 14 ( Fig. 5.3), - Venting the pressure medium chamber 30 and, if necessary, repeating the last described pressing and venting process, as well as - Removal of the sack-shaped inner container 40 containing the pressed material 2 from the press container 10 ( Fig. 5.5) and - Disposing of the pressed material contained therein

[0035] Although the sack-shaped press container 10 can also be filled while standing on the ground or on the loading platform of a trailer, e.g., during hand-harvesting of grapes on site in the vineyard, and possibly with the aid of a frame, for the filling process it is particularly advantageous to suspend it, together with the inner container 40 inserted therein, on one side at its upper edge 10c from a lifting device 92, as shown in Fig. 5.1 is indicated.

[0036] In order to drain the released juice from the press container 10 during the filling process, the juice drain valve 12 is opened during the filling of the press material 2 into the open press container 10, which is held on one side by the lifting device 92. Fig. 5.1) preferably open, so that the juice released from the material to be pressed during the filling process can escape from the press container 10 via the juice outlet 14. This significantly increases the productivity of the press 1 according to the invention during machine filling, since the volume of the material to be pressed is reduced by the volume of the escaping juice even before the actual pressing process.

[0037] To loosen the material to be pressed 2 after a pressing operation and thereby increase the juice flow in a subsequent pressing operation, it can be provided that the pressure medium chamber 30 is ventilated and the sack-shaped press container 10 is lowered by means of the lifting device 92, such that the bottom 10b of the press container 10 rests on a support device 90 to improve the mixing and loosening of the material to be pressed 2, which is in Fig. 5.4 is only indicated by dotted lines.

[0038] Subsequently, the sack-shaped press container 10 is opened, and the sack-shaped inner container 40, made of mesh fabric and closed by the zipper 42, along with the pressed material contained therein, is removed by means of the lifting device 92 and transported to another location for disposal or further processing. There, it is opened at the top using the zipper 42 and emptied, in particular by turning or inverting the drainage bag 40. The emptying of the pressed material 2 from the sack-shaped inner container 40 and the subsequent cleaning of the same by means of a spray device 100 is described in the Fig. 6.1 and 6.3. The inner container 40 can be removed and emptied using loops 45 arranged on the top and bottom of the inner container 40, as shown, for example, in the Fig. 3, Fig. 6.1 and 6.2 are indicated.

[0039] Similarly, the empty press container 10 can be very easily cleaned using the spray device 100, then dried and folded flat for transport or storage, as shown in Fig. 6.3 and 6.4 are indicated.

[0040] The lifting device 92 can be used in the case of stationary processing, as in Fig. 7.1 to 7.3 indicate a stationary guide rail 94 along which the press container 10 is moved during the filling and pressing process ( Fig. 6.1 to 6.2).

[0041] As in the Fig. As indicated in Figures 7.3 to 7.5, in this embodiment the juice outlet 14 can be pulled upwards after the pressing process via a traction element 96 and a winch (not shown in detail) ( Fig. 7.3) and thereby the sack-shaped press container 10 and the inner container 40 contained therein, made of flexible sieve fabric, are turned inside out above an indicated funnel-shaped collecting and conveying device 98, as shown in Fig. 7.4 is indicated. The inverted arrangement consisting of an outer inner container 40 and an inner press container 10 can finally be cleaned by means of a schematically indicated spray device 100 ( Fig. 7.5).

[0042] Furthermore, it can be provided that the sack-shaped press container 10 remains in the lifting device 92 after one or more pressing operations and that the sack-shaped inner container can be picked up with another lifting device and moved to another location for further processing, and thus the entire process can be carried out advantageously without contact with the ground. Reference symbol list 1 Press 2 Pressed material 10 press containers 10a Outer wall of the press container 10b Floor 10c upper edge 10c of the sack-shaped press container 10.1 First section of the upper edge of the press container 10.2 second section of the upper edge of the press container 11 Weld / glue seam 12 Juice drain valve 14 Juice drain 30 Pressure medium space 32 surrounding, self-contained air chambers 33 Fabric film 34 valve 40 inner containers 42 other fasteners / zipper 45 loops 50 sealing agents 52 Keder 60 juice collection containers 62 Clamping handle 70 Drainage element 72 flexible hoses / rods 74 upper end of the additional drainage element 76 Quick release 78 lower end of the additional optional drainage element 80 vibration generators 90 Support device 92 Lifting device 94 Running rail 96 traction elements 98 funnel-shaped collecting and conveying devices 100 spray device QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 1438185 B1

[0002] WO 2022 / 069140 A1

[0003] WO 2022 / 069139 A1

[0004]

Claims

[1] Press (1) for pressing liquid-containing material (2), in particular grapes, comprising a flexible liquid-tight sack-shaped press container (10) with a juice outlet (14) formed on its bottom (10b) which can be closed by a juice drain valve (12) and a pressure medium chamber (30) formed on its outer wall (10a) which includes a circumferential, self-contained air chamber (32) which can be filled with compressed air via a valve (34), a sack-shaped inner container (40) made of liquid-permeable flexible mesh fabric which can be inserted into the interior of the sack-shaped press container (10) and which can be filled with material (2), and with closing means (50) with which the sack-shaped press container (10) can be closed in a substantially liquid-tight manner after the sack-shaped inner container (40) has been inserted. [2] Press according to claim 1, characterized by, that the pressure medium space (30) comprises a flexible fabric film (33) attached to the outside of the sack-shaped press container (10), which is connected airtight to the outer wall (10a) of the sack-shaped press container (10) by thermal welding or bonding along a circumferential weld or bond seam (11). [3] Press according to claim 2, characterized by, that the circumferential fabric film (33) is centrally attached to the bottom (10b) of the sack-shaped container (10), in particular at the juice outlet (14), and is connected to the outer wall (10a) of the sack-shaped press container (10) along the circumferential weld or adhesive seam (11), wherein the circumferential weld or adhesive seam (11) is arranged between the top of the outer wall (10a) of the sack-shaped press container (10) and preferably approximately in its center, such that when the pressure medium chamber (30) is pressurized, the flexible outer wall (10a) of the sack-shaped press container is moved upwards by the expanding pressure medium chamber (30) together with the juice outlet (14) and the sack-shaped inner container (40) made of liquid-permeable sieve fabric (drainage bag). [4] Press according to claim 2 or 3, characterized by, that the height of the wall section of the outer wall (10a) of the sack-shaped press container (10) between the juice outlet (14) and the circumferential weld or glue seam (11) is less than the height of the radially outer wall section of the pressure medium space (30) made of fabric film (33), which extends from the weld or glue seam (11) to the juice outlet (14). [5] Press according to any of the preceding claims, characterized by , that the sack-shaped inner container (40) made of liquid-permeable sieve fabric can be closed at its top by further closing means (42), in particular a zipper. [6] Press according to any of the preceding claims, characterized bythat the flexible liquid-tight sack-shaped press container (10) can be closed by means of closure means (50) which comprise a first, in particular tubular, keder (52) received in a first subsection (10.1) of the upper edge (10c) of the flexible liquid-tight sack-shaped press container (10), which is designed to hold the liquid-tight sack-shaped press container (10) in an open position when it is held by a clamping handle (62) encompassing the subsection (10.1). [7] Press according to claim 6, characterized bythat the closure means (50) comprise a second, in particular semi-tubular, keder (54), which is preferably designed to be complementary to the keder (52) and is arranged in a second subsection (10.2) of the upper edge (10c) opposite the first subsection (10.1), and which is designed to engage in the first subsection (10.1) by creating a liquid-tight connection between the opposing subsections (10.1, 10.2) when the two subsections (10.1, 10.2) are mechanically pressed together and / or into each other by the clamping handle (62) to close the opening of the flexible liquid-tight press container (10). [8] Press according to any of the preceding claims, characterized by, that in the sack-shaped inner container (40) made of liquid-permeable sieve fabric at least one drainage element (70) made of flexible sieve fabric can be accommodated, one upper end (72) of which is closed or sealable and the other lower end (74) of which can be attached above the juice outlet (14) to the bottom (10b) of the flexible liquid-tight sack-shaped press container (10) in such a way that the interior of the drainage element (70) communicates with the juice outlet (14). [9] Press according to any of the preceding claims, characterized by, that a vibration generator (80), in particular a vibration motor or a preferably motor-driven knocking device, is arranged on the outside of the flexible liquid-tight sack-shaped press container (10), which applies pulsating pressure waves to the pressure medium chamber (30) or the juice outlet (14) to increase the juice flow during the pressing process, the frequency and / or amplitude of which is preferably variable. [10] Press according to any of the preceding claims, characterized by, that between the inner wall of the flexible liquid-tight sack-shaped press container (10) essentially vertically extending spacer cords or plastic tubes are arranged, which during the pressing process provide a juice drainage space extending along the spacer cords or tubes to the juice outlet (14) between the sieve fabric and the inner wall of the flexible liquid-tight sack-shaped press container (10), through which juice emerging from the material being pressed (2) can flow to the juice outlet (14). [11] Method for pressing liquid-containing material (2), in particular grapes, using a press (1) according to one of the preceding claims, characterized by the following procedural steps: Opening the sack-shaped press container (10) and the sack-shaped inner container (40) inserted into it at the top, Filling the material to be pressed (2) into the opened sack-shaped inner container (40), Closing the sack-shaped inner container (40) and the sack-shaped press container (10) by means of the further closing means (42) and the closing means (50) and pressurizing the pressure medium chamber (30) with a pressurized gas, in particular compressed air, as well as collecting the juice flowing through the juice outlet (14) in a juice collection container (60). [12] Method according to claim 11, characterized by , that the sack-shaped press container (10) is suspended on one side at its upper edge (10c) on a lifting device (92) for filling the sack-shaped inner container (40) contained therein with material to be pressed (2). [13] Method according to claim 12, characterized by , that the juice drain valve (12) is open during the filling of the press material (2) and that the juice released from the press material during the filling process can escape from the press container (10) via the juice drain (40). [14] Method according to any one of claims 11 to 13, characterized by, that the pressure medium chamber (30) is ventilated and the sack-shaped press container (10) is lowered by means of the lifting device (92) in such a way that the bottom (10b) of the press container (10) rests on a support device (90) to improve the mixing and loosening of the material to be pressed (2). [15] Method according to any one of claims 11 to 14, characterized by , the sack-shaped press container (10) is lowered to the ground by the lifting device (92) after one or more pressing operations, the lowered container is opened and the closed sack-shaped inner container with the pressed material contained therein is lifted by a mobile lifting device, in particular a forklift, for disposal or further processing and moved to another location, where it is opened at its top by means of the further closing means (42) and in particular emptied by turning it inside out.

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