AU2001246005B2 - Process for shelling fruits with shells - Google Patents
Process for shelling fruits with shells Download PDFInfo
- Publication number
- AU2001246005B2 AU2001246005B2 AU2001246005A AU2001246005A AU2001246005B2 AU 2001246005 B2 AU2001246005 B2 AU 2001246005B2 AU 2001246005 A AU2001246005 A AU 2001246005A AU 2001246005 A AU2001246005 A AU 2001246005A AU 2001246005 B2 AU2001246005 B2 AU 2001246005B2
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- AU
- Australia
- Prior art keywords
- nuts
- shells
- cnsl
- water
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23N—MACHINES OR APPARATUS FOR TREATING HARVESTED FRUIT, VEGETABLES OR FLOWER BULBS IN BULK, NOT OTHERWISE PROVIDED FOR; PEELING VEGETABLES OR FRUIT IN BULK; APPARATUS FOR PREPARING ANIMAL FEEDING- STUFFS
- A23N5/00—Machines for hulling, husking or cracking nuts
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Preparation Of Fruits And Vegetables (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Processing Of Solid Wastes (AREA)
Description
WO 01/62110 PCTIZA01100025 1 PROCESS FOR SHELLING FRUITS WITH SHELLS Technical Field This invention relates to a method of shelling fruits with shells, particularly but not exclusively cashew nuts.
Background Art The cashew nut tree (Anacardium Occidentale) produces a fruit, or cashew apple. This fruit is pear shaped and is similar in size to a large guava. At the bottom of the fruit, the seed (or nut) develops and hangs externally. The seed (or nut) is kidney shaped and is in reality the true fruit of the tree. When the fruit is ripe, it falls to the ground. The nut is then harvested and dried, in preparation for shelling.
Raw cashew nuts consist of an outer skin, connected to a honey comb like fibrous layer, which contains a highly corrosive and toxic resin known as cashew nut shell liquid (CNSL). This fibrous layer is in turn connected to an inner shell which envelopes the kernel. The kernel is further protected by a WO 01/62110 PCT/ZA01/00025 2 membrane, or seed coat.
The outer skin is extremely tough but pliable. The CNSL (90% anacardic acid and 10% cardol) offers great protection against attack by insects, rodents and birds. The inner shell allows water absorption into the kernel, but prevents penetration of CNSL.
Due to the toughness of the outer skin and the presence of the CNSL, the shelling of cashew nuts is an expensive process. Not only is it difficult to break the outer skin without damaging the kernel, but great care must be taken that the CNSL does not contaminate the kernel. Contamination leads to an inferior taste. Furthermore, the seed coat clings to the kernel and has to be manually scraped off once the shell has been removed.
1 5 Different processes have been suggested and are in use for shelling cashew nuts.
Generally raw cashew nuts are bulk stored in a low humidity environment with a water content of 8-12% (by mass). This is in order to prevent stack burn and germination. Before shelling, the raw nuts are soaked in water in order to increase the water content. The absorption of water causes: 1) The shell of the nut to swell and pull away from the kernel; WO 01/62110 PCT/ZA01/00025 3 2) The kernel to become flexible which reduces breakage during shelling; 3) Reduced burning of the kernel if CNSL removal is done by roasting of the raw nuts; and 4) Reduced viscosity of the CNSL.
After soaking the nuts in water the CNSL is removed by different methods including: 1) Roasting the raw nuts in CNSL at about 250 0 C and then centrifugally removing the residue CNSL; 2) Super-heated steam application to the raw nuts and collection of condensate; and 3) Solvent extraction.
The shells may then be removed mechanically by centrifugally spinning the nuts and releasing them at high speed against an object; or pressing the nuts through inward turning rollers; or dropping the nuts through rotating conical abrasive surfaces until the shell separates from the nut. These mechanical methods have the disadvantage that they have a poor to very poor whole kernel recovery which reduces the value drastically. Semi-mechanical process are accordingly more popular since they result in higher yields of whole WO 01/62110 PCTIZA01/00025 4 kernels. Such semi-mechanical processes include: 1) Splitting the nut between two blades with a foot operated plunger; 2) Various hand operated cutting, sawing and squeezing devices; and 3) Hand shelling, by cracking the shell with a small wooden mallet.
French Patent 2450 067 suggests a process of shelling nuts by plunging the nuts into liquid air or liquid nitrogen and then crushing the nuts by mechanical hammering to break the shells. The shelling is preceded by a double sizing process, humidification, steam drying and drying. This process has the disadvantage that when the nuts are treated with the liquid air or nitrogen, the kernels easily become embrittled and break during the hammering process.
The process does not disclose removal of CNSL prior to cryogenic treatment.
Disclosure of the Invention The inventors have now found that if the CNSL is removed prior to subjecting the nuts to liquid nitrogen treatment, the recovery of whole kernels is increased.
As indicated above CNSL removal is a known process but not in combination PMOPERSa.U001246005 Ispa.doc8a07/04 with cryogenic treatment. In the prior art the CNSL is removed to prevent kernel contamination and easier handling of the nut. During cryogenic treatment the last mentioned advantages have no significance since the CNSL will be "frozen" during cryogenic treatment and difficulties relating to contamination or handling due to CNSL would not occur. Accordingly CNSL removal would not be contemplated where cryogenic treatment is to be applied.
An alternative method of shelling fruit with shells is provided by the present invention.
According to the present invention there is provided a method of treating nuts having shells containing a non-aqueous liquid, the method comprising the steps of: first, removing at least 50% (by mass) of the non-aqueous liquid from the shells; and thereafter subjecting the nuts to cold treatment to embrittle the shells.
In this specification "non-aqueous liquid" is a liquid other than water.
In a preferred embodiment of the invention the nuts may comprise cashew nuts which include shells with CNSL therein as a non-aqueous liquid. Preferably at least 50% (by mass) of the CNSL is removed prior to subjecting the nuts to the cold treatment, preferably as much CNSL as is practically possible is removed.
P:\OPER\San\2001246005 Ispa.doc-08/0704 6 A preferred embodiment of the present invention is wherein the nuts are cashew nuts and the shells contain CNSL and wherein said first of the steps comprises removing at least (by mass) of the CNSL from the shells.
The CNSL may be removed by subjecting the nuts to heat treatment, preferably subsequent to humidifying the nuts. The nuts may be subjected to heat treatment by roasting the nuts, preferably from 180 to 300 0 C, preferably from 200 to 270 0 C, and preferably at about 220 0 C. The roasting may be carried out in a liquid, preferably in CNSL. The roasting may be for a period of 1 to 3 minutes, preferably 1.5 to 3 minutes, preferably about 2 minutes.
Additionally, but preferably alternatively, the nuts may be subjected to heat treatment to remove CNSL and at least partially replace it with water.
WO 01/62110 PCT/ZA01/00025 7 Preferably the nuts are subjected to steam treatment to remove CNSL and to at least partially replace CNSL with water. More than 70% (by mass) of the CNSL may be removed. Preferably steam is applied at a temperature from to 150°C; preferably from 100 to 140 0 C and most preferably at about 125 0
C.
The steam treatment may be for a period of 5 to 35 min, preferably 10 to minutes, preferably about 15 minutes.
Steaming may take place at a pressure of above atmospheric pressure.
The heat treated nuts may be subjected to centrifugal treatment to further remove at least some of the remaining CNSL especially where the nuts have been roasted. In cases where the nuts are subjected to heat treatment to replace CNSL with water, the centrifugal treatment may be omitted.
Subsequent to the heat treatment the nuts may be cooled or allowed to cool to ambient temperature.
The method may also include the step of humidifying the nuts to increase the water content in the shells prior to removing the non-aqueous liquid.
Preferably the nuts have a water content of between 8 and 12% (by mass) P:\OPER\Sn\201246005 I spamdoc.O8/074 8 prior to humidification.
Preferably the nuts are humidified in order that the shells have a water content of between and 50% (by mass), preferably between 20% and 40% (by mass). Where the nuts are roasted to remove the CNSL, the water content is preferably about 30% (by mass). Where the nuts are subjected to heat treatment to remove CNSL and replace it with water, the water content is preferably about 25% (by mass). The nuts may be humidified through any known process such as soaking the nuts in water.
Where the method includes the step of humidifying the nuts to increase the water content in the shells prior to removing the non-aqueous liquid, the humidification preferably takes place at a temperature below 20'C, preferably below 15'C, preferably from 3 to 15 0
C,
preferably from 5 to 10 0 C, most preferably at a temperature of about 7°C. Preferably the nuts are humidified by soaking them in water. Preferably the nuts are soaked in the water for a period of 12 to 96 hours. Where the nuts are subjected to roasting to remove CNSL, the nuts are preferably soaked in water for a period of about 72 hours at a temperature of about 7°C to obtain a water content of about 30% (by mass). Where the nuts are subjected to heat treatment to replace CNSL with P:\OPER\San\2001246005 Ispa.doc.08/07/04 9 water, the nuts are soaked in water for a period of about 24 hours at a temperature of about 7°C to obtain a water content of about 25% (by mass).
The humidification of the nuts is preferably carried out in such a manner to control the amount of water reaching the kernels (especially in the case of cashew nuts). If the water content of the kernels rises to above 14% by mass it causes the kernels to split. It is believed that at the lower temperatures indicated above, especially below 15'C, better control is obtained of the movement of water to the kernels. Furthermore if the nuts are humidified above 20'C, tannins contained in the seed coat are deposited onto the kernel which leads to discoloration.
The cold treatment to embrittle the shells may comprise cryogenic treatment. Preferably the nuts are brought into contact with a medium in liquid form, which medium would be in the form of a gas at ambient temperature and at atmospheric pressure. The medium may comprise liquid nitrogen and/or liquid air.
Preferably it comprises liquid nitrogen.
In cases where CNSL is removed without being replaced with water, the nuts WO 01/62110 PCT/ZA01/00025 may be treated with liquid nitrogen for a period from 10 to 90 seconds, preferably from 20 to 60 seconds, preferably about 40 seconds. In cases where the CNSL is replaced with water, the nuts may be treated with liquid nitrogen for 10 to 60 seconds, preferably 15 to 40 seconds, preferably about 20 seconds.
Care should be taken not to subject the nuts to too long cold treatment, to prevent the kernels from becoming embrittled. It is believed that when the CNSL is removed prior to cold treatment the kernel is better isolated and less prone to become embrittled. It is also believed that when the CNSL remains in the shells, freezing of the CNSL results not in embrittlement of the shell, but rather hardening of the shell.
Sizing of the nuts may take place prior to subjecting them to cold treatment to embrittle the shells. This is especially the case where the nuts are roasted to remove CNSL. It is believed that sizing is not necessary where CNSL is replaced with water.
Subsequent to the cold treatment the embrittled shells of the nuts may be cracked. The cracked shells may then be removed.
WO 01/62110 PCT/ZA01/00025 11 Known methods of cracking the shells may be employed.
In one embodiment of the invention the nuts may be centrifugally flung against an object, preferably the object is rotating in a direction opposite to the movement of the nuts.
It is also foreseen that the cracking may occur through ultrasonic treatment of the nuts subsequent to embrittlement.
It also is foreseen that the cracking may occur through subjection of the nuts subsequent to embrittlement to high frequency mechanical vibration.
Preferably cracking should take place as soon as possible after the cold treatment. Preferably cracking should take place within seven seconds of the 1 5 cold treatment to embrittle the shells.
Once the shell has been removed the seed coat remains on the seed and has to be removed. The seed coat may be manually removed.
It is foreseen that the kernel with the seed coat may be treated by means of a P:\OPERXSa,\2OO246OS 1spa dom-0807,4 12 gas such as ozone to enhance removal of the seed coat.
It is foreseen that a bleaching agent, such as ozone can be used to bleach kernels which have become discoloured.
According to an embodiment of the present invention there is provided a method of treating cashew nuts having shells containing CNSL, the method comprising the steps of: humidifying the nuts at a temperature below 20'C in order that the shells contain more than 10% (by mass) water; thereafter removing at least 50% (by mass) of the CNSL from the shells; and thereafter subjecting the nuts to cold treatment to embrittle the shells.
Preferably CNSL is replaced with water.
The method may also include the step of removing the shells subsequent to the cold treatment.
According to the present invention there is provided a method of shelling nuts having shells containing a non-aqueous liquid, the method comprises the steps of: P:\OPER\San\2001246J05 Ispa.dom-OdV7iO4 13 treating the nuts in accordance with the present invention; and thereafter cracking the embrittled shells of the nuts to remove said shells.
The invention also relates to products (especially shelled kernels of cashew nuts) produced by the above methods.
The invention will now be further described by means of the following non-limiting examples.
Example 1 An amount of 900kg dry raw cashew nuts, having a water content of about 8% by mass, was sized into four different categories according to known methods. The sizes were as follows (size in mm width): Group 1 smaller than Group 2 from 15mm to 19mm Group 3 larger than 19mm to 23mm WO 01/62110 PCT/ZA01/00025 14 Group 4 larger than 23mm The nuts were then soaked in water at a temperature of 7°C for a period of 72 hours to allow the water content in the shells of the cashew nuts to raise above 10% (by mass). The water content of the nuts increased to 35% by mass.
The cashew nuts were then roasted in CNSL for a period of two minutes. The nuts of group 1 were roasted at a temperature of 210°C, the nuts of group 2 at a temperature of 2200C, the nuts of group 3 at a temperature of 230°C and the nuts of group 4 at a temperature of 240 0 C. The cashew nuts were then removed from the hot CNSL and remaining oil was removed by subjecting the nuts to centrifugal treatment for a period of 2 minutes.
Thereafter the cashew nuts were allowed to cool to ambient temperature. The cashew nuts were then submerged in liquid nitrogen for a period of 40 seconds.
After removal from the liquid nitrogen the nuts were mechanically hurled against a steel surface, where the shells shattered to separate them from the kernels.
WO 01/62110 PCT/ZA01/00025 A 97% whole kernel recovery rate was achieved, without any CNSL contamination to the kernels.
Example 2 An amount of 900kg dry raw cashew nuts, having a water content of about 8% by mass, was soaked in water at a temperature of 7 0 C for a period of 24 hours to allow the water content in the shells of the cashew nuts to raise above (by mass) to about 25% (by mass).
The cashew nuts were then steamed in a closed container containing water at a pressure of about 288 kPa for a period of 15 minutes at 125 0 C, after which they were removed and allowed to cool to ambient temperature.
The nuts were then submerged in liquid nitrogen for a period of 20 seconds.
After removal from the liquid nitrogen, the nuts were mechanically hurled against a steel surface, where the shells shattered, to separate them from the kernels.
P:\OPER\San\2001246005 Ispa doc-08/07/04 16 A 94% whole kernel recovery was achieved, without any CNSL contamination to the kernels.
The method of example 1 used less liquid nitrogen compared to the method of example 2.
However, the method of example 2, where CNSL is removed and replaced with water by means of steam treatment, was found to be a cleaner and an easier method. In example 2 no sizing was required.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in Australia.
Claims (16)
1. A method of treating nuts having shells containing a non-aqueous liquid, the method comprising the steps of: first, removing at least 50% (by mass) of the non-aqueous liquid from the shells; and thereafter subjecting the nuts to cold treatment to embrittle the shells.
2. The method of claim 1, wherein the nuts are cashew nuts and the shells contain Cashew Nut Shell Liquid (CNSL), and wherein said first of the steps comprises removing at least 50% (by mass) of the CNSL from the shells.
3. The method of claim 2, wherein as much CNSL as is practically possible is removed.
4. The method of claim 2, wherein the CNSL is removed by subjecting the nuts to heat treatment. The method of claim 4, wherein the nuts are subjected to heat treatment by roasting the nuts at a temperature from 180 to 300 0 C.
6. The method of claim 4, wherein the nuts are subjected to heat treatment to remove CNSL and at least partially replace CNSL with water. P:\OPER\S.6200I246005 Ispa.doc/7)04 18
7. The method of claim 4, wherein the nuts are subjected to steam treatment to remove CNSL and at least partially replace CNSL with water.
8. The method of any one of the claims 2 to 7, wherein the nuts are humidified to increase the water content in the shells to between 15 and 50% (by mass) prior to removing the CNSL.
9. The method of claim 8, wherein the nuts are soaked in water in order that the shells have a water content from 25 to 30% (by mass). The method of claim 8 or 9, wherein the humidification takes place at a temperature below 20 0 C.
11. The method of claim 10, wherein the humidification takes place at a temperature from 3 to 15 0 C.
12. The method of claim 10, wherein the humidification takes place at a temperature from 5 to 10 0 C.
13. The method of claim 2, further comprising the step of: humidifying the nuts at a temperature below 20 0 C in order that the shells contain more than 10% (by mass) water prior to removing at least 50% (by mass) of the CNSL from the shells. P:\OPER\San\2001246005 Ispa doc-08/0704 19
14. The method of claim 13, wherein the removed CNSL is replaced with water. The method of any one of the preceding claims, wherein the cold treatment to embrittle the shells comprises cryogenic treatment.
16. The method of claim 15, wherein the nuts are brought into contact with liquid nitrogen and/or liquid air.
17. The method of any one of the preceding claims, wherein the embrittled shells of the nuts are cracked subsequent to the cold treatment.
18. The method of treating nuts having shells containing a non-aqueous liquid, substantially as hereinbefore described with reference to the Examples.
19. A method of shelling nuts having shells containing a non-aqueous liquid, the method comprising the steps of: treating the nuts according to the method of any one of the preceding claims; and thereafter cracking the embrittled shells of the nuts to remove said shells. P:\OPER\Sa\2001246005 spa.doc-08/0704 Shelled nuts prepared by the method of claim 19. DATED this 8th day of July, 2004 Cashew Technology International (Proprietary) Limited By DAVIES COLLISON CAVE Patent Attorneys for the Applicant
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA2000/0935 | 2000-02-25 | ||
ZA200000935 | 2000-02-25 | ||
PCT/ZA2001/000025 WO2001062110A2 (en) | 2000-02-25 | 2001-02-23 | Process for shelling fruits with shells |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2001246005A1 AU2001246005A1 (en) | 2001-11-15 |
AU2001246005B2 true AU2001246005B2 (en) | 2004-07-29 |
Family
ID=25588642
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2001246005A Ceased AU2001246005B2 (en) | 2000-02-25 | 2001-02-23 | Process for shelling fruits with shells |
AU4600501A Pending AU4600501A (en) | 2000-02-25 | 2001-02-23 | Process for shelling fruits with shells |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU4600501A Pending AU4600501A (en) | 2000-02-25 | 2001-02-23 | Process for shelling fruits with shells |
Country Status (5)
Country | Link |
---|---|
AP (1) | AP1481A (en) |
AU (2) | AU2001246005B2 (en) |
BR (1) | BR0108645A (en) |
OA (1) | OA12319A (en) |
WO (1) | WO2001062110A2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1393202B1 (en) * | 2009-03-02 | 2012-04-11 | Brovia | PROCEDURE AND SYSTEM FOR PROCESSING AND PROCESSING AGRICULTURAL PRODUCTS |
CN102669796A (en) * | 2012-05-30 | 2012-09-19 | 中国农业大学 | Chinese chestnut or castanea henryi unshelling method |
MA37165B1 (en) | 2014-06-26 | 2016-08-31 | Mascir Morrocan Foundation For Advanced Science Innovation & Res | Enzymatic method for extracting almonds from dried fruits from a lignocellulosic shell |
EP3245881A1 (en) * | 2016-05-20 | 2017-11-22 | Linde Aktiengesellschaft | Method of cooling nuts |
JP6752252B2 (en) * | 2018-07-31 | 2020-09-09 | 筑波乳業株式会社 | How to make peeled nuts |
CN110495582A (en) * | 2019-09-10 | 2019-11-26 | 广西中盟机械有限责任公司 | A kind of fruit flesh pulp extraction process of passion fruit |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1954650A (en) * | 1931-04-06 | 1934-04-10 | Harvel Corp | Method of removing the shells of cashew nuts |
FR2450067A1 (en) * | 1979-03-01 | 1980-09-26 | Bertin & Cie | Industrial cryogenic shelling of cashew and similar nuts - in which freezing and hammering are adjusted to suit narrow size range of nut |
GB2326583A (en) * | 1997-06-26 | 1998-12-30 | Univ Greenwich | Shelling cashew nuts using a laser |
-
2001
- 2001-02-23 WO PCT/ZA2001/000025 patent/WO2001062110A2/en active IP Right Grant
- 2001-02-23 AP APAP/P/2002/002607A patent/AP1481A/en active
- 2001-02-23 AU AU2001246005A patent/AU2001246005B2/en not_active Ceased
- 2001-02-23 BR BR0108645-6A patent/BR0108645A/en active Search and Examination
- 2001-02-23 OA OA1200200259A patent/OA12319A/en unknown
- 2001-02-23 AU AU4600501A patent/AU4600501A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1954650A (en) * | 1931-04-06 | 1934-04-10 | Harvel Corp | Method of removing the shells of cashew nuts |
FR2450067A1 (en) * | 1979-03-01 | 1980-09-26 | Bertin & Cie | Industrial cryogenic shelling of cashew and similar nuts - in which freezing and hammering are adjusted to suit narrow size range of nut |
GB2326583A (en) * | 1997-06-26 | 1998-12-30 | Univ Greenwich | Shelling cashew nuts using a laser |
Also Published As
Publication number | Publication date |
---|---|
AU4600501A (en) | 2001-09-03 |
WO2001062110A2 (en) | 2001-08-30 |
WO2001062110A3 (en) | 2002-06-06 |
OA12319A (en) | 2006-05-12 |
AP1481A (en) | 2005-10-31 |
BR0108645A (en) | 2002-12-10 |
AP2002002607A0 (en) | 2002-09-30 |
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TC | Change of applicant's name (sec. 104) |
Owner name: CASHEW TECHNOLOGY INTERNATIONAL (PROPRIETARY) LIMI Free format text: FORMER NAME: BERLEIN PROCESS TECHNOLOGY (PTY) LIMITED |
|
FGA | Letters patent sealed or granted (standard patent) | ||
MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |