Filtration unit for use in machine for preparing ready-to-drink nutritional liquids

1. A filtration unit for use in a nutritional liquid preparation machine using a container for preparing a beverage, the filtration unit comprising:

a removable, disposable filter; and

a re-usable protective casing encompassing the filter, said protective casing comprising:

an outlet wall with at least one liquid outlet for delivering filtered liquid to the container in the container holder, wherein the at least one liquid outlet comprises a perforating member protruding from the outlet wall, and wherein the perforating member comprises a hollow needle and provides a liquid inlet through a sealing membrane of the container for allowing filtered liquid to be fed in the container; and

an inlet wall with at least one liquid inlet, wherein the inlet wall of the protective casing further comprises a gas inlet for receiving a gas injector of the beverage machine, and wherein the gas inlet is axially offset relative to the liquid inlet and in fluid communication with the liquid outlet;

wherein the protective casing is formed by a first cover forming the inlet wall and a second cover forming the outlet wall, the first cover and the second cover being at least partially detachable from one another to enable different removable filters to be placed in a dedicated compartment of the protective casing;

wherein the filter is arranged in a removable manner in the protective casing; and

wherein the filtration unit is adapted to engage a container holder intended to be inserted in the nutritional liquid preparation machine.

2. The filtration unit of claim 1 , wherein the filter comprises a filter media associated to a reinforcement support.

3. The filtration unit of claim 2 , wherein the reinforcement support is placed against an outlet side of the filter media.

4. The filtration unit of claim 2 , wherein means for liquid-tight sealing are arranged in the protective casing to ensure a liquid-tight sealing arrangement between the inlet side of the filter and the outlet side of the filter.

5. The filtration unit of claim 2 , wherein the protective casing comprises an open window arranged to slidably receive the filter therein.

6. The filtration unit of claim 2 , wherein the filter is housed in a dedicated compartment of the protective casing which is axially offset relative to the axis of the liquid outlet.

7. The filtration unit of claim 1 , wherein the first cover and the second cover are guided with respect to one another in opening of the protective casing by at least one of a hinge, a transversal connection means, and rotational connection means.

8. The filtration unit of claim 1 , wherein the sealing membrane comprises a sealing foil.

9. An assembly for insertion in a nutritional liquid preparation machine, comprising:

a filtration unit adapted to engage a container holder intended to be inserted in the machine, said filtration unit comprising:

a removable, disposable filter; and

a re-usable protective casing encompassing the filter, said protective casing comprising:

an outlet wall with at least one liquid outlet for delivering filtered liquid to the container in the container holder, wherein the at least one liquid outlet comprises a perforating member protruding from the outlet wall, and wherein the perforating member comprises a hollow needle and provides a liquid inlet through a sealing membrane of the container for allowing filtered liquid to be fed in the container; and

an inlet wall with at least one liquid inlet, wherein the inlet wall of the protective casing further comprises a gas inlet for receiving a gas injector of the beverage machine, and wherein the gas inlet is axially offset relative to the liquid inlet and in fluid communication with the liquid outlet; and

wherein the protective casing is formed by a first cover forming the inlet wall and a second cover forming the outlet wall, the first cover and the second cover being at least partially detachable from one another to enable different removable filters to be placed in a dedicated compartment of the protective casing; and

wherein the filter is arranged in a removable manner in the protective casing;

a container holder for the preparation of a nutritional liquid and having a container receiving seat; and

a container comprising:

a body containing nutritional ingredients, said body being sized to fit in the container receiving seat of the container holder; and

a top wall adapted for being sealingly engaged by the filtration unit.

10. The assembly of claim 9 , wherein the container holder further comprises a housing dedicated for receiving the filtration unit therein and wherein the protective casing of the filtration unit is sized and dimensioned to complementarily fit in the said housing in a moveable or removable manner.

11. The assembly of claim 10 , wherein the filtration unit is connected to the container holder in a moveable manner.

12. The assembly of claim 11 , wherein the filtration unit is connected to the container holder to be movable between a first position in which the container receiving seat of the holder is uncovered for enabling the loading and unloading of the container in the container holder and a second position in which the container receiving seat is covered for enabling the liquid outlet of the unit to be positioned at the inlet side of the container when a container is present in the container holder.

13. The assembly of claim 12 , further comprising a latch to releasably secure the filtration unit in the second position.

14. The assembly of claim 13 , wherein the latch extends by an actuation member placed at or close to a handle of the container holder.

15. The assembly of claim 9 , wherein the sealing membrane comprises a sealing foil.

16. A filtration kit, comprising:

a plurality of filters, wherein a filtering surface area of each filter within the plurality of filters differs; and

at least one casing for enabling the constitution of a filtration unit for use in a nutritional liquid preparation machine using a container for preparing the beverage, the filtration unit being adapted to engage a container holder intended to be inserted in the machine, said filtration unit being obtained by the arrangement of a filter selected from the plurality of filters in the casing, said casing comprising an inlet wall with at least one liquid inlet and an outlet wall with at least one liquid outlet for delivering filtered liquid to the container in the container holder, wherein the at least one liquid outlet comprises a perforating member protruding from the outlet wall, wherein the perforating member comprises a hollow needle and provides a liquid inlet through a sealing membrane of the container for allowing filtered liquid to be fed in the container, wherein the protective casing is formed by a first cover forming the inlet wall and a second cover forming the outlet wall, the first cover and the second cover being at least partially detachable from one another to enable the filter to be placed in a dedicated compartment of the protective casing, and wherein the inlet wall of the protective casing further comprises a gas inlet for receiving a gas injector of the beverage machine, and

wherein the gas inlet is axially offset relative to the liquid inlet and in fluid communication with the liquid outlet; and wherein each filter of the plurality of filters can be arranged in a removable manner in the casing, thereby allowing the user to select one filter within the plurality of filters for its arrangement in the casing.

17. A method of producing an assembly for insertion in a nutritional liquid preparation machine, the method comprising the steps of:

connecting the filtration unit of claim 8 to a container holder, wherein the container holder comprises a container receiving seat; and

loading a container in the container receiving seat of the container holder, the container comprising a body containing nutritional ingredients, and the container further comprising a top wall that is sealingly engaged by the filtration unit.

18. The filtration unit of claim 1 , wherein the filter is arranged in a removable manner in the protective casing such that a size of the filter can be adapted based on filtering needs.

19. The assembly of claim 9 , wherein the filter is arranged in a removable manner in the protective casing such that a size of the filter can be adapted based on filtering needs.