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WO1998024541A1 - Method of coating particulate matter - Google Patents

Method of coating particulate matter Download PDF

Info

Publication number
WO1998024541A1
WO1998024541A1 PCT/GB1997/003263 GB9703263W WO9824541A1 WO 1998024541 A1 WO1998024541 A1 WO 1998024541A1 GB 9703263 W GB9703263 W GB 9703263W WO 9824541 A1 WO9824541 A1 WO 9824541A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
particulate matter
liquid substance
mixer
oil
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.)
Ceased
Application number
PCT/GB1997/003263
Other languages
French (fr)
Inventor
William Duffett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGGLOMERATION TECHNOLOGY Ltd
Original Assignee
AGGLOMERATION TECHNOLOGY Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AGGLOMERATION TECHNOLOGY Ltd filed Critical AGGLOMERATION TECHNOLOGY Ltd
Priority to AU54013/98A priority Critical patent/AU5401398A/en
Publication of WO1998024541A1 publication Critical patent/WO1998024541A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/10—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in stationary drums or troughs, provided with kneading or mixing appliances
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23P—SHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY A SINGLE OTHER SUBCLASS
    • A23P10/00—Shaping or working of foodstuffs characterised by the products
    • A23P10/30—Encapsulation of particles, e.g. foodstuff additives
    • A23P10/35—Encapsulation of particles, e.g. foodstuff additives with oils, lipids, monoglycerides or diglycerides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain

Definitions

  • the present invention relates to a method of coating particulate matter.
  • An object of the invention is to provide a method of coating particulate matter whereby the material produced is free flowing, well encapsulated, and/or has undergone minimal breakdown during the coating process.
  • a method of coating particulate matter comprising mixing particulate matter and a liquid substance in a mixer and rapidly cooling the mixture.
  • the particulate matter and liquid substance are preferably mixed in a low shear mixer, most preferably on slow speed.
  • a low shear mixer is typically any mixer that does not substantially physically damage the powder.
  • the specific type and speed of the mixer may be selected to suit the strength of the powder being used.
  • the particulate matter comprises particles with a diameter substantially in the range 0.5 mm to 25 cm.
  • the coating material is typically defined by the liquid substance or liquid fraction which may comprise one or more of the following :-
  • fat, oil and/or wax which is normally liquid at room temperature
  • flavour substances typically oil fractions or emulsions
  • starch substances or mixtures which may comprise hydrophillic and/or hydrophobic mixtures ;
  • fat, oil and/or wax containing a liquid and/or powder colour (7) fat, oil and/or wax containing a liquid and/or powder colour.
  • the liquid substance for use in the method of the invention may be obtained by conventional means such as melting.
  • the liquid substance is added to the mixer in a quantity substantially in the range 0.25% to 60% of the particulate matter added.
  • the mixture may be rapidly cooled by the direct addition of a cooling agent such as liquid nitrogen and/or chilled air to the mixer.
  • a cooling agent such as liquid nitrogen and/or chilled air
  • the mixture may be cooled or further cooled in a fluid bed.
  • the latter may be cooled by injection of a cooling agent such as by chilled air and/or direct liquid nitrogen injection.
  • the fluid bed may be a batch or continuous fluid bed.
  • the rapid cooling may comprise the direct injection or fluid bed injection of liquid oxygen, carbon dioxide, mixtures of these and liquid nitrogen or any mixture or combination of the aforementioned cooling agents.
  • the rapid cooling comprises from substantially 1 to 60 seconds from the time that the liquid phase comes in contact with the cooling agent.
  • the chilled air comprises air below about 10°C.
  • the invention further provides particulate matter coated according to a method of the invention.
  • the free flowing properties of the coated particulates is enhanced by the rapid cooling which affects the crystal form where fat/oil/wax is used as all or part of the coating material.
  • Irregular shapes can be easily coated using the method of the invention and it is possible by carrying out the process a number of times, for example two or three times, to add different coating materials one on top of the other.
  • the low shear mixer may be of any suitable type such as drum type, tote blenders, slow moving screw or paddle type.
  • the fluid bed may comprise a vessel having an air distribution grate at a lower end thereof.
  • One or more filters may be positioned at an upper end of the vessel to filter out entrained solids.
  • Nozzles for spraying atomised liquids, typically water, may be positioned in, on or adjacent to, the vessel, for example, in the sides or top of the vessel .
  • Fig. 1 is schematic view showing use of a low shear mixer in the method of the invention.
  • Fig. 2 is a schematic view showing use of a fluidised bed agglomerator in the method of the invention.
  • a low shear mixer 1 comprising an open topped vessel 2 having mixing blades or paddles 4 located therein.
  • the blades are mounted on a driving shaft 6 which is rotated by motor means 8 so that the blades move slowly.
  • motor means 8 any suitable low shear mixer may be used and for example, a ribbon or screw mixing means may be used instead of blades 4 and shaft 6.
  • liquid substance is added typically while the blades are moving. This is illustrated by arrow B.
  • liquid nitrogen or chilled air is added to the mixer as shown at C by suitable means such as nozzles located in the sides of the mixer.
  • the coated powder is output via a suitable outlet 10 on the vessel 2, as shown by arrow D.
  • the mixture 12 for example transferred from a mixer as described with reference to Figure 1 without the coolant C, is added to a fluidised bed comprising an open topped vessel 14.
  • Liquid such as water may be sprayed into the vessel via one or more nozzles 16 located in or on the vessel. Typically the nozzles 16 are designed to atomise the liquid.
  • the base of the vessel 14 comprises a mesh plate 18 and the vessel is connected to a chilled air or liquid nitrogen supply 20 so that, in use, chilled air or liquid nitrogen passes up through the mesh plates, through the mixture and out through filters located at the top of the vessel 14.
  • Other rapid cooling supply means 20 may be used as described above .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biophysics (AREA)
  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)

Abstract

A method of coating particulate matter comprises mixing particulate matter and a liquid substance in a mixer and rapidly cooling the mixture.

Description

METHOD OF COATING PARTICULATE MATTER
The present invention relates to a method of coating particulate matter.
An object of the invention is to provide a method of coating particulate matter whereby the material produced is free flowing, well encapsulated, and/or has undergone minimal breakdown during the coating process.
According to the invention there is provided a method of coating particulate matter comprising mixing particulate matter and a liquid substance in a mixer and rapidly cooling the mixture.
The particulate matter and liquid substance are preferably mixed in a low shear mixer, most preferably on slow speed. In this respect, a low shear mixer is typically any mixer that does not substantially physically damage the powder. In general, the specific type and speed of the mixer may be selected to suit the strength of the powder being used. Preferably the particulate matter comprises particles with a diameter substantially in the range 0.5 mm to 25 cm. The coating material is typically defined by the liquid substance or liquid fraction which may comprise one or more of the following :-
(1) fat, oil and/or wax which is normally liquid at room temperature;
(2) fat, oil and/or wax which is normally solid at room temperature;
(3) chocolate or chocolate based substance with or without colour and/or flavour additives; (4) flavour substances, typically oil fractions or emulsions;
(5) starch substances or mixtures, which may comprise hydrophillic and/or hydrophobic mixtures ;
(6) fat, oil and/or wax containing a liquid and/or powder flavour;
(7) fat, oil and/or wax containing a liquid and/or powder colour.
Any mixture of one or more of the above may be used. For any of the above, where the substance is normally solid at room temperature, the liquid substance for use in the method of the invention may be obtained by conventional means such as melting.
Preferably, the liquid substance is added to the mixer in a quantity substantially in the range 0.25% to 60% of the particulate matter added.
The mixture may be rapidly cooled by the direct addition of a cooling agent such as liquid nitrogen and/or chilled air to the mixer. Thus, optionally mixing may continue during such rapid cooling. Alternatively or additionally the mixture may be cooled or further cooled in a fluid bed. The latter may be cooled by injection of a cooling agent such as by chilled air and/or direct liquid nitrogen injection. The fluid bed may be a batch or continuous fluid bed. Thus, the mixture may be transferred from the mixer to a fluid bed for rapid cooling. Alternatively or additionally, the rapid cooling may comprise the direct injection or fluid bed injection of liquid oxygen, carbon dioxide, mixtures of these and liquid nitrogen or any mixture or combination of the aforementioned cooling agents. Preferably the rapid cooling comprises from substantially 1 to 60 seconds from the time that the liquid phase comes in contact with the cooling agent. Preferably the chilled air comprises air below about 10°C.
The invention further provides particulate matter coated according to a method of the invention.
The free flowing properties of the coated particulates is enhanced by the rapid cooling which affects the crystal form where fat/oil/wax is used as all or part of the coating material.
Irregular shapes can be easily coated using the method of the invention and it is possible by carrying out the process a number of times, for example two or three times, to add different coating materials one on top of the other.
The low shear mixer may be of any suitable type such as drum type, tote blenders, slow moving screw or paddle type. The fluid bed may comprise a vessel having an air distribution grate at a lower end thereof. One or more filters may be positioned at an upper end of the vessel to filter out entrained solids. Nozzles for spraying atomised liquids, typically water, may be positioned in, on or adjacent to, the vessel, for example, in the sides or top of the vessel .
The invention will now be described further by way of example only, and with reference to the accompanying drawings in which: - Fig. 1 is schematic view showing use of a low shear mixer in the method of the invention; and
Fig. 2 is a schematic view showing use of a fluidised bed agglomerator in the method of the invention.
Referring to Fig. 1, matter is added as shown schematically by arrow A, in powder form to a low shear mixer 1 comprising an open topped vessel 2 having mixing blades or paddles 4 located therein. The blades are mounted on a driving shaft 6 which is rotated by motor means 8 so that the blades move slowly. It will be appreciated that any suitable low shear mixer may be used and for example, a ribbon or screw mixing means may be used instead of blades 4 and shaft 6.
While or after the powders are added, the liquid substance is added typically while the blades are moving. This is illustrated by arrow B. As the mixture is mixed, liquid nitrogen or chilled air is added to the mixer as shown at C by suitable means such as nozzles located in the sides of the mixer. The coated powder is output via a suitable outlet 10 on the vessel 2, as shown by arrow D.
Referring to Fig. 2, the mixture 12, for example transferred from a mixer as described with reference to Figure 1 without the coolant C, is added to a fluidised bed comprising an open topped vessel 14. Liquid such as water may be sprayed into the vessel via one or more nozzles 16 located in or on the vessel. Typically the nozzles 16 are designed to atomise the liquid. The base of the vessel 14 comprises a mesh plate 18 and the vessel is connected to a chilled air or liquid nitrogen supply 20 so that, in use, chilled air or liquid nitrogen passes up through the mesh plates, through the mixture and out through filters located at the top of the vessel 14. Other rapid cooling supply means 20 may be used as described above .
It will be appreciated that the present invention is not intended to be restricted to the details of the above embodiments which are described by way of example only.

Claims

1. A method of coating particulate matter comprising mixing particulate matter and a liquid substance in a mixer and rapidly cooling the mixture.
2. A method according to claim 1, wherein the particulate matter and liquid substance are mixed in a low shear mixer.
3. A method according to claim 2, wherein the mixing is at slow speed.
4. A method according to any preceding claim, wherein the particulate matter comprises particles with a diameter substantially in the range 0.5 mm to 25 cm.
5. A method according to any preceding claim, wherein the liquid substance comprises fat, oil and/or wax which is normally liquid at room temperature.
6. A method according to any preceding claim, wherein the liquid substance comprises fat, oil and/or wax which is normally solid at room temperature.
7. A method according to any preceding claim, wherein the liquid substance comprises chocolate or chocolate based substance with or without colour and/or flavour additives .
8. A method according to any preceding claim, wherein the liquid substance comprises flavour substances.
9. A method according to claim 8, wherein the flavour substance comprises oil fractions or emulsions.
10. A method according to any preceding claim, wherein the liquid substance comprises starch substances or mixtures .
11. A method according to claim 10, wherein the starch substance or mixture comprises hydrophillic and/or hydrophobic mixtures.
12. A method according to any preceding claim, wherein the liquid substance comprises fat, oil and/or wax containing a liquid and/or powder flavour.
13. A method according to any preceding claim, wherein the liquid substance comprises fat, oil and/or wax containing a liquid and/or powder colour.
14. A method according to any preceding claim, wherein the liquid substance is obtained by melting.
15. A method according to any preceding claim, wherein the liquid substance is added to the mixer in a quantity substantially in the range 0.25% to 60% of the particulate matter added.
16. A method according to any preceding claim, wherein the rapid cooling comprises adding a cooling agent to the mixer.
17. A method according to claim 16, wherein the cooling agent comprises liquid nitrogen and/or chilled air and/or liquid oxygen and/or carbon dioxide.
18. A method according to any preceding claim, wherein the mixing continues during the rapid cooling.
19. A method according to any preceding claim, wherein the mixture is cooled or further cooled in a fluid bed.
20. A method according to claim 19, wherein the mixture in the fluid bed is cooled by injection of a cooling agent .
21. A method according to claim 20, wherein the cooling agent comprises liquid nitrogen and/or chilled air and/or liquid oxygen and/or carbon dioxide.
22. A method according to any preceding claim, wherein the rapid cooling comprises from substantially 1 to 60 seconds from the time that the liquid phase comes in contact with the cooling agent.
23. Particulate matter coated according to a method as claimed in any preceding claim.
24. A method substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB1997/003263 1996-12-06 1997-12-05 Method of coating particulate matter Ceased WO1998024541A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54013/98A AU5401398A (en) 1996-12-06 1997-12-05 Method of coating particulate matter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9625415.6 1996-12-06
GBGB9625415.6A GB9625415D0 (en) 1996-12-06 1996-12-06 Method of coating particulate matter

Publications (1)

Publication Number Publication Date
WO1998024541A1 true WO1998024541A1 (en) 1998-06-11

Family

ID=10804072

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/003263 Ceased WO1998024541A1 (en) 1996-12-06 1997-12-05 Method of coating particulate matter

Country Status (3)

Country Link
AU (1) AU5401398A (en)
GB (1) GB9625415D0 (en)
WO (1) WO1998024541A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003059079A1 (en) * 2002-01-15 2003-07-24 Mars Incorporated Method for chocolate coating of soft confectionery centers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278246A2 (en) * 1987-01-20 1988-08-17 The Dow Chemical Company Production of granular bisphenols
EP0560509A1 (en) * 1992-02-26 1993-09-15 Unilever Plc Method of preparing a coated, frozen foodstuff
EP0619137A1 (en) * 1993-04-08 1994-10-12 Ciba-Geigy Ag Process to prepare finely granulated material
WO1995012990A1 (en) * 1992-11-10 1995-05-18 The Procter & Gamble Company Producing translucent amorphous sugar coated edible nuts and seeds

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278246A2 (en) * 1987-01-20 1988-08-17 The Dow Chemical Company Production of granular bisphenols
EP0560509A1 (en) * 1992-02-26 1993-09-15 Unilever Plc Method of preparing a coated, frozen foodstuff
WO1995012990A1 (en) * 1992-11-10 1995-05-18 The Procter & Gamble Company Producing translucent amorphous sugar coated edible nuts and seeds
EP0619137A1 (en) * 1993-04-08 1994-10-12 Ciba-Geigy Ag Process to prepare finely granulated material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003059079A1 (en) * 2002-01-15 2003-07-24 Mars Incorporated Method for chocolate coating of soft confectionery centers
US7232584B2 (en) 2002-01-15 2007-06-19 Mars, Incorporated Method of chocolate coating soft confectionery centers

Also Published As

Publication number Publication date
AU5401398A (en) 1998-06-29
GB9625415D0 (en) 1997-01-22

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