METHOD AND PLANT FOR HARVESTING AND POST-PRODUCTION PACKAGING OF LEAFY CROPS BY HYDROPONIC TECHNIQUE

Abstract

A method for harvesting and post-production packaging of leafy crops by hydroponic technique comprises the steps of spraying a plurality of vital plants such to create a water film on leaves to keep them hydrated. The method includes pre-cooling the vital plants at a temperature lower than or equal to +5 C. within a period of about 12 hours and cutting and separating the plants from the supporting substrate and from roots. The method also includes packaging the plants at a temperature not higher than 5 C. The invention also includes a plant for harvesting and post-production packaging of leafy crops by hydroponic technique.

Claims

1. A method for harvesting and post-production packaging of leafy crops by hydroponic technique comprising the steps of: spraying a plurality of vital plant such to create a water film on leaves to keep them hydrated, said plants being anchored by their respective roots to a supporting substrate; gradually pre-cooling the vital plants at a temperature lower than or equal to +5 C. within a period of about 12 hours, in order to slow down their development and ripening; cutting and separating the plants from the supporting substrate and from roots. packaging the plants at a temperature not higher than 5 C.

2. The method according to claim 1, comprising after the spraying step the further steps of: automated stacking of a plurality of channels on which the vital and ripe plants are housed coming out from a greenhouse. moving the stacked channels with the plants and relevant supporting substrate in a cooling environment;

3. The method according to claim 1, comprising before and after the cutting step the further steps of: moving the channels with the cut plants to subsequent processing steps at a temperature not higher than 5 C.

4. The method according to claim 1, comprising after the cutting step the further step of: sorting and discarding not suitable or not entire produce.

5. The method according to claim 1, comprising after the cutting step the further step of: weighing the produce.

6. The method according to claim 2, wherein said channels entering the processing plant are recognized by a barcode system such to be able to process different produce varieties.

7. The method according to claim 1, wherein together with the cutting step a step manually cleaning the plant is performed.

8. The method according to claim 1, wherein the cutting step and packaging step are manually performed by operators.

9. The method according to one of the preceding claims, wherein the temperature of the produce is maintained on the processing line at an optimal preservation temperature, about close to the one present in said pre-cooling environment.

10. A plant for the harvesting and post-production packaging of leafy crops by hydroponic technique comprising: a cold-storage room configured to cool a plurality of plants at a temperature lower than 5 C., said plants being anchored by their respective roots to a supporting substrate; a cutting and harvesting station configured to harvest and separate the plants from the supporting substrate and from roots; said plant characterized in that it comprises a spraying apparatus configured to spray the plants and that said cold-storage room is a pre-cooling storage room configured to bring still vital plants to the packaging temperature before being cut in the cutting station.

11. The plant according to claim 10, further comprising: an automated moving and lifting apparatus configured to receive and move a plurality of channels coming out from the greenhouse, said channels containing the vital plants anchored to the relevant supporting substrate; a processing line configured for the automated movement of the channels with the plants towards the following steps at a temperature not higher than 5 C.

12. The plant according to claim 10, further comprising in sequence: a packaging station for the cut plants configured to put the produce in bags. a palletization and storage station for the packed produce for being distributed.

13. The plant according to claim 10, further comprising after said cutting station: a station for sorting and discarding not suitable produce; a weighing station configured to determine the weight of the produce.

14. The plant according to claim 10, comprising an electronic system recognizing the channels and the relevant transported variety of produce such to process different types of produce.

15. The plant according to claim 11, wherein said apparatus for the automated lifting and movement of the channels is a conventional mast lifting apparatus or column lifter.

16. The plant according to claim 10, wherein said cold-storage room comprises a multi-rack intermediate fluid refrigeration system, provided with air-coolers arranged in said cold-storage room, such to enable homogeneous cooling and circulation and a constant humidity rate.

17. The plant according to claim 11, wherein said processing line comprises a linear belt conveyer configured to convey the produce from the cold-storage room to the following processing stations.

18. The plant according to claim 11, comprising a local refrigeration system for the processing line configured to keep the produce at a temperature equal to about the one present in the environment of said cold-storage room.

19. The plant according to claim 18, wherein said local refrigeration system of said processing line comprising a plurality of plastic-fabric sleeves configured to distribute cold air through oriented micro-holes of said sleeves.

20. The plant according to claim 18, wherein said local refrigeration system of said processing line is configured to take cold air to be distributed from the cold-storage room.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The constructive and operating characteristics of the method and plant for harvesting and post-production packaging of leafy crops by hydroponic technique may be better understood from the following detailed description, in which reference is made to the attached drawings, which represent preferred and non-limiting embodiments, wherein:

[0037] FIG. 1 is a schematic plan view of an embodiment of the plant which implements the method for the harvesting and post-production packaging of leafy crops by hydroponic technique of the present invention;

[0038] FIG. 2 is a schematic representation of the various steps of the method for the harvesting and post-production packaging of leafy crops by hydroponic technique of the present invention;

[0039] FIG. 3 is a schematic view of a flow chart of the series of the steps of the method for the harvesting and post-production packaging of leafy crops by hydroponic technique of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0040] In the following description, the term produce refers to the cultivated plant in any post-production processing step, whether it is vital, severed from the roots from the supporting substrate, as well as put into bags and packaged.

[0041] The term pre-cooling refers to the cooling of the still vital plant, at the typical temperatures of the food cold chain, before cutting or peeling it, unlike the conventional cooling of the produce that is performed after cutting and harvesting the plant.

[0042] Referring first to FIG. 3, the method of the present invention relates to an automated process for post-production processing applicable to production plants of hydroponic plant cultivations, generally suitable for leafy and tuft vegetables such as the many varieties of salad plants, and also suitable for other plants such as rocket, basil, spinach, and the like.

[0043] Referring also to FIGS. 2 and 3, the method 100, which can be implemented in a related harvesting and post-production packaging system 10, comprises the following main steps: [0044] spraying 102 a plurality of vital plants 60 such to create a water film on leaves to keep them hydrated, said plants 60 being anchored by their respective roots to a supporting substrate 62; [0045] gradually pre-cooling 108 the temperature of vital plants 60 from about +25-30 C., that is the plant temperature 60 in a greenhouse 90, at a temperature lower than or equal to +5 C. within a period of about 12 hours, in order to slow down their development and ripening; [0046] cutting 112 and separating of the vital plants 60 from the peat layer and from the roots within a cutting and harvesting station; [0047] packaging (118) the plants (60) at a temperature not higher than 5 C. in an automated packaging station.

[0048] The method 100 can also comprise, after the spraying step 102, the further steps of: [0049] automated stacking 104 of a plurality of channels 50 on which the vital and ripe plants 60 are housed coming out from a greenhouse 90, said plants being arranged on a rack, preferably by a conventional lifting and moving system; [0050] moving 106 the stacked channels 50 with the plants and relevant supporting substrate 62 in a cooling environment;

[0051] The method 100 may also comprise, before and after the cutting step 112, the further steps of: [0052] moving 110, 110 the channels 50 with the cut plants 60 towards the subsequent steps and at a temperature generally not higher than 5 C., preferably on an automated processing line 18.

[0053] The spraying step 102 is preferably, but not limited thereto, performed in said greenhouse 90 at the outlet thereof and before entering the plant 10, in order to prevent the accumulation of humidity in the plant 10 itself. It is however generally advisable that the spraying step takes place before the pre-cooling step.

[0054] Said supporting substrate 62 is preferably made of natural peat but may be of any other natural or synthetic material with the same characteristics.

[0055] The method of the invention may comprise the following further steps, after the cutting step 112: [0056] sorting and discarding 114 not suitable or not entire produce; [0057] weighing 116 the produce.

[0058] Said channels 50, on which the vital plants 60 entering the plant 10 are housed, can be recognized and diversified by a bar code recognition system, such to be able to process different produce varieties that will then be recognized during the processing in the following steps.

[0059] The cutting step 112 of the plant generally takes place manually by operators and, together with said cutting step 112, a cleaning of the plant can also be included and performed.

[0060] According to the method 100 of the invention on the automated processing line, between the cutting step 112 and the separation of the produce roots and the peat supporting substrate 62 to the packaging 118 and storage for distribution, the produce is maintained during all the process of processing and packaging at an optimal preservation temperature, about close to that present in the pre-cooling environment (typically +5 C), by a localized distribution system of cold air coming from the cooling environment, such to maintain a higher and comfortable temperature in the plant 10 environments with consequent benefit for the operators.

[0061] Referring now to FIGS. 1 and 2, the present invention also refers to a plant 10 for the harvesting and post-production packaging of leafy crops by hydroponic technique. For simplicity and clarity, the numerical references of identical elements and characteristics are shown in the attached drawings of only some of them.

[0062] The plant 10 is advantageously arranged at the outlet of a conventional hydroponically-cultivated automated greenhouse, preferably of the MGS type, and comprises: [0063] a cold-storage room 16, advantageously multi-rack, configured to cool a plurality of plants 60 at a temperature lower than 5 C., said plants 60 being anchored by their respective roots to a supporting substrate 62, said plants 60 being configured to be housed in a plurality of channels 50; [0064] a cutting and harvesting station 20 configured to separate the plants 60 from the supporting substrate 62 and from roots; [0065] a packaging station 22 for the cut plants 60 configured to put the produce in bags;
wherein in said plant 10 the innovative characteristic is due to the fact that it comprises a spraying apparatus 14 configured to spraying the plants 60 such to create a water film on the leaves, said spraying apparatus 14 being preferably arranged outside the plant 10; and that said cold-storage room 16 defines a pre-cooling environment or storage room configured to bring the still vital plants 60 to the packaging temperature before being cut or severed in the cutting station 20.

[0066] The plant 10 further comprises: [0067] an automated moving and lifting apparatus 12 configured to receive and move a plurality of channels 50 coming out from the greenhouse 90, said channels 50 containing the vital plants 60 anchored to the relevant supporting substrate 62; [0068] a processing line 18, preferably a conveyor belt, of the channels 50 with the plants 60 for the automated movement of said channels 50 towards the following steps at a temperature not higher than 5 C.

[0069] The plant 10 further comprises after said packaging station 22: [0070] a palletization and storage station 24 for the packed produce for being distributed.

[0071] The plant 10 may also comprise after said cutting station 20: [0072] a station 26 for sorting and discarding not suitable produce; [0073] a weighing station 28 configured to determine the weight of the produce.

[0074] The automated plant 10 may be further provided with an electronic system recognizing the channels 50 and the relevant transported variety of produce such to process different types of produce in the same processing line 18.

[0075] The apparatus 12 for the automated lifting and movement of the channels 50 is preferably a conventional mast lifting apparatus or column lifter, with a translating effect and provided with a bar code reader, said lifting apparatus 12 being configured to position said channels on a vertical shelves rack.

[0076] Said cold-storage room 16 preferably comprises a cooling apparatus with intermediary fluid with water having an ethylene glycol concentration suitable for food, and operating by means of aero-refrigerating devices arranged in the same cold-storage room 16, such to enable circulation and adequate homogeneous cooling of all the cold-storage room areas 16 and maintain a constant humidity rate during the pre-cooling step.

[0077] The processing line 18 preferably comprises a linear belt conveyer configured to convey the produce from the cold-storage room 16 to the following processing stations.

[0078] In order to maintain the environment of the plant 10 at a comfortable temperature for the operators 70, the plant 10 may advantageously comprise a local refrigeration system (not shown) of the processing line 18 configured to maintain the produce at a temperature equal to about that present in the pre-cooling environment (+5 C.) of the cold-storage room 16, said local refrigeration system comprising a plurality of plastic-fabric sleeves (not shown) configured to distribute cold air, conveyed by micro oriented holes of said sleeves.

[0079] Said local refrigeration system of the line advantageously draws cold air to be distributed from the cold-storage room 16 having about the same temperature and humidity characteristics.

[0080] From the description of the method 100 and the plant 10 for the harvesting and the post-production packaging of leafy crops by hydroponic technique of the present invention, the operation described below is inferred.

[0081] With reference to FIG. 1 and in particular to FIGS. 2 and 3, the method 100 and the plant 10 for the harvesting and post-production packaging of leafy crops by hydroponic technique is arranged at the outlet of a conventional automated hydroponic greenhouse 90.

[0082] Preferably, before the entrance of the channels 50 in the plant 10, the plants 60 are sprayed by a water-spraying step 102 with an aerosol nebulization, such to create a water film on the leaves in order to avoid dehydration of the plant 60 in the following pre-cooling step 108.

[0083] The channels 50 with the plants 60 enter the plant 10 in sequence one at a time, arranging on the mast lifting apparatus 12 with translation effect provided with a bar code reader and, subsequently, said channels 50 with the plants 60 are stacked vertically on a shelving rack with the specific variety of produce stored by said bar code and arranged in the cold-storage room 16.

[0084] Subsequently, unlike a conventional post-production processing plant, the plants 60 are pre-cooled (before cutting) together with the roots and the supporting substrate 62 inside the cold-storage room 16, in which a slow down of the ripening of still vital plants 60 is also obtained.

[0085] The slow cooling in the cooling environment of the cold-storage room 16 brings the vital plants 60 from a temperature of about +25-30 C., typical of a cultivation greenhouse 90, to a temperature of about +5 C. within a period of about 12 hours, typical temperatures for the processing of food products, maintaining a relative humidity higher than 95% of the output product, such to avoid deterioration and dehydration of the plants 60.

[0086] Once the desired temperature has been reached, the channels 50 with the plants 60 are conveyed towards the following cutting 112 and packaging 118 steps by the same automated lifting apparatus 12, entering in said pre-cooling cold-storage room 16. The channels 50 stacked in the rack of the cold-storage room 16 and comprising the plants 60 still having their roots inserted in the peat supporting substrate 62, are then withdrawn at the outlet in the opposite direction from said lifting apparatus 12 and recognized by the bar code reader. The peat substrate 62 is necessary in the cooling step because therein the nutrients are still present, which enable the plants 60 to survive during the stay in the cold-storage room 16, since at the entrance of the plant 10 in the channels 50 there is no longer nutritious solution.

[0087] The bar code that identifies the specific variety of the produce chosen for that processing step.

[0088] The channels 50 with the still vital plants 60 are then arranged on the automated conveyor belt of said processing line 18 sent along it, one at a time, through a rapid sliding automatic door and exit from the pre-cooling cold-storage room 16 with plants 60 temperature about around +5 C.

[0089] In the following cutting step 112, the operator 70 assigned to the cutting station 20 picks up the still vital plant 60 from the channel 50, optionally performs a cleaning operation, and cuts or severs the roots from the plant 60 eliminating at this point also the peat supporting substrate 62, which is moved away from the processing line 18 together with the channels 50 by a conveyor belt for recycling the channels (not shown).

[0090] Subsequently, the cut plant 60 is arranged on the conveyor belt of the processing line 18 and conveyed towards the automated packaging step or flow pack.

[0091] After the cutting step 112, further manual or automatic steps or operations may be performed in the appropriate stations 26 for sorting and discarding the not suitable produce and a station 28 for weighing the final produce.

[0092] From the cutting of the plant 60 to the packaging and palletization of the packaging containing the packages ready for being distributed, the produce thus packaged maintains an optimal storage temperature, that is a temperature about or equal to the final temperature of the pre-cooling cold-storage room 16.

[0093] The local refrigeration system is configured to maintain the cold chain on the processing line 18 and comprises plastic-fabric sleeves for distributing cold air (not shown), thanks to the micro-holes of the same sleeves that enable to orient and distribute cold air taken from the pre-cooling storage room locally on the produce with the same temperature and humidity characteristics. This enables a comfortable environment to be obtained in the processing plant 10, with consequent benefit for the operators 70, since the pre-cooled produce does not need to be processed and maintained in an environment at temperatures in the order of those of the cold-storage room 16 in order to keep unalterable the greater preservability conditions of the produce.

[0094] As can be seen from above, the advantages obtained by the method and the plant for harvesting and post-production packaging of leafy crops by hydroponic technique of the present invention are obvious.

[0095] The method and the plant for harvesting and post-production packaging of leafy crops by hydroponic technique is particularly advantageous because it enables, for the same produce obtained with a plant according to the prior art, to increase the preservation time and freshness of the final produce, and therefore its duration, of at least 12 hours thanks to the pre-cooling of the plant in a still vital condition before cutting.

[0096] A further advantage of the method and the plant for harvesting and post-production packaging of leafy crops by hydroponic technique of the present invention is due to the fact that it can be directly integrated and implemented with the described conventional MGS automated systems of hydroponic cultivations, even already existing, as a complete cooperation of the plant's development automation in the greenhouse in created with that of post-production processing plant.

[0097] A further advantage of the method and the plant for harvesting and post-production packaging of leafy crops by hydroponic technique of the present invention is that of being able to arrange, thanks to pre-cooling, an already cold produce, which does not require further deep refrigeration, thus enabling to keep a higher and healthier temperature in the processing environment for the operators involved in the processing steps.

[0098] Although the invention has been described above with particular reference to some preferred embodiments, given by way of non-limiting example, numerous modifications and variations will be apparent to a person skilled in the art in the light of the above description. The present invention, therefore, intends to embrace all modifications and variations which fall within the spirit and in the protective scope of the following claims.