GB2232469A - Ice-making apparatus and method - Google Patents

Ice-making apparatus and method Download PDF

Info

Publication number
GB2232469A
GB2232469A GB8912240A GB8912240A GB2232469A GB 2232469 A GB2232469 A GB 2232469A GB 8912240 A GB8912240 A GB 8912240A GB 8912240 A GB8912240 A GB 8912240A GB 2232469 A GB2232469 A GB 2232469A
Authority
GB
United Kingdom
Prior art keywords
heat exchanger
skeleton
rotor
ice
scraping means
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.)
Withdrawn
Application number
GB8912240A
Other versions
GB8912240D0 (en
Inventor
Terence Paul Baker
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.)
Unilever PLC
Original Assignee
Unilever PLC
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 Unilever PLC filed Critical Unilever PLC
Priority to GB8912240A priority Critical patent/GB2232469A/en
Publication of GB8912240D0 publication Critical patent/GB8912240D0/en
Publication of GB2232469A publication Critical patent/GB2232469A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G9/00—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor
    • A23G9/04—Production of frozen sweets, e.g. ice-cream
    • A23G9/22—Details, component parts or accessories of apparatus insofar as not peculiar to a single one of the preceding groups
    • A23G9/222—Freezing drums
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G9/00—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor
    • A23G9/04—Production of frozen sweets, e.g. ice-cream
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G9/00—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor
    • A23G9/04—Production of frozen sweets, e.g. ice-cream
    • A23G9/14—Continuous production
    • A23G9/16—Continuous production the products being within a cooled chamber, e.g. drum
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
    • A23G9/00—Frozen sweets, e.g. ice confectionery, ice-cream; Mixtures therefor
    • A23G9/04—Production of frozen sweets, e.g. ice-cream
    • A23G9/22—Details, component parts or accessories of apparatus insofar as not peculiar to a single one of the preceding groups
    • A23G9/224—Agitators or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C1/00—Producing ice
    • F25C1/12—Producing ice by freezing water on cooled surfaces, e.g. to form slabs
    • F25C1/14—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes
    • F25C1/145—Producing ice by freezing water on cooled surfaces, e.g. to form slabs to form thin sheets which are removed by scraping or wedging, e.g. in the form of flakes from the inner walls of cooled bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/008—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using scrapers

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Confectionery (AREA)

Abstract

Scraped surface heat exchanger comprising a stator having a cylindrical chamber 1 surrounded by a jacket 2, in which chamber a rotor 3 carrying scraping means 10 is rotatably mounted, at least the surface of the rotor, including the scraping means mainly consisting of unhalogenated polyalkene and preferably polypropene. An ice confection product is prepared in the heat exchanger by cooling and agitating an ice mix to generate ice crystals which are thereafter frozen to a storage temperature of -18 DEG C. <IMAGE>

Description

AnDaratus and Method The invention relates to an improved scraped surface heat exchanger, particularly for use in preparing ice confection products such as ice cream, water ice, sherbet and milk ice.
For manufacturing ice confection products in a continuous process, a scraped surface heat exchanger is usually used comprising a stator having a cylindrical chamber surrounded by a jacket for refrigeration, in which chamber a rotor carrying scraping means is rotatably mounted.
In practice only a limited degree of freezing can be achieved since at higher ice content the ice confection material ceases to flow properly through the heat exchanger and thereafter the annular space between the stator and the rotor will be blocked. Thereafter the ice confection material in the heat exchanger has to be thawed out whereafter the freezing process can be resumed. This results in disturbances and interruptions of the production.
An object of the invention is to provide a heat exchanger of the above general type having a reduced tendency to blocking, also called " icing up".
The invention provides a heat exchanger as described hereinbefore; at least the surface of the rotor, including the scraping means, mainly consisting of unhalogenated polyalkene and in particular polypropene.
For improved dimensional stability preferably a rigid material skeleton at least for the greater part provided with a polyalkene coating is used as a rotor and/or as a scraper blade. Suitable rigid materials for use as a skeleton are the usual metals as used in food processing equipment, in particular stainless steel.
In a preferred embodiment the scraping edges of the scraper means bearing on the heat exchanging surface of the stator are of bare metal, while the rotor is essentially coated with or consisting of unhalogenated polyalkene. The hinge parts of the rotor connecting the scraper means pivotably to the main structure of the rotor may but need not be partly uncoated. To reliably prevent the coating from peeling and coming off the skeleton feather edges are to be prevented. In practice this may be realized by arranging grooves in the metal skeleton along the free edges of the coating. Preferably the grooves are shaped such that a firm locking is effected. For an improved attachment throughgoing holes may be provided in the skeleton for accommodating ligaments between the coating on either side of the skeleton.
The invention also relates to a method for preparing an ice confection product by cooling and agitating an ice mix in a scraped surface heat exchanger, comprising a stator and a rotor carrying scraping means, to generate ice crystals in said mix and thereafter freezing this partly frozen mix to a storage temperature of -18eC or less. According to the invention the initial ice crystal content may be increased if a heat exchanger is used, at least the surface of the rotor and of the scraping means thereof mainly consisting of a polymer having nonadhesive properties with respect to the frozen ice mix.
Preferably polyalkene and in particular polypropene is used as a polymer having non-adhesive properties.
The invention will be described below by way of example only, reference being had to the attached drawings, in which: Fig.l is a longitudinal sectional view of one embodiment of the heat exchanger according to the invention; Fig.2 is a sectional view taken along line II-II in Fig.l; Fig.3 and 4 are enlarged elevational views of two embodiments of scraper blades according to the invention; Fig.5 and 6 are cross sectional views of the scraper blades as shown in Fig. 3 and 4 respectively.
The heat exchanger as shown in Figs 1 and 2 comprises an elongated cylindrical chamber 1 through which a mixture to be frozen may be caused to travel. This chamber is surrounded by a jacket 2, through which a refrigerant may be circulated.
Inside the chamber a coaxial rotor 3 is rotatably supported. The rotor 3 comprises a central shaft 4, which is supported in suitable bearings 5, 6 attached to either end wall of the chamber 1 and a solid cylinder 7 of polypropene having three symmetrically arranged flat sides 8. Hinge means 9 extend from the flat sides for pivotably connecting a plurality of scraper blades 10 to the rotor 3. These scraper blades 10 are bearing with a knife edge 11 against the cylindrical inner surface 12 of the chamber 1. The rotor 3 and the cylindrical chamber 1 are defining an annular space 13 therebetween.
Fig.3 is an elevation and Fig.5 a cross section of a scraper blade 10 having a knife edge 11 at the one longitudinal side and hinge means 9 near the opposite side. The scraper blade is made of a stainless steel skeleton 15 and has a coating 16 applied thereon such that the area 17 along the knife edge 11 is left bare.
The free edges 18 of the coating are relatively thick and anchored in longitudinal grooves 19 along the bare area 17, as is clearly to be seen in the cross-sectional view of Fig. 5.
For additional attachment small round apertures 20 are provided in the metal blade 15, as is shown in broken lines in Fig.3. The coating 16 on either side of the blade is interconnected by ligaments 21 extending through the apertures.
Fig.4 is an elevational view of a scraper blade 22 in a second embodiment. Similar parts as discussed in connection with Fig.3 and 5 are indicated by the same reference numbers.
The metal skeleton 23 of this scraper blade is provided with a series of rectangular apertures 24, through which the coating 16 on either side of the blade is interconnected.
Improvement of the attachment may also be obtained by dovetailed grooves 25 along the bare areas 17 as shown in cross-section in Fig.6, whereby a firm lock between the skeleton 23 and the edges 26 of the coating 16 is obtained.

Claims (16)

Claims
1. Scraped surface heat exchanger comprising a stator having a cylindrical chamber surrounded by a jacket, in which chamber a rotor carrying scraping means is rotatably mounted, characterized in that at least the surface of the rotor including the scraping means mainly consists of unhalogenated polyalkene.
2. Heat exchanger according to claim 1, wherein the rotor including the scraping means mainly consists of polypropene.
3. Heat exchanger according to any claim 1 or 2, wherein a metal skeleton at least for the greater part provided with a polyalkene coating is used as a rotor and/or as a scraper blade.
4. Heat exchanger according to claim 3, wherein the scraper blades are provided with bare metal scraping edges.
5. Heat exchanger according to claim 4, wherein grooves are arranged in the metal skeleton along the free edges of the coating.
6. Heat exchanger according to claim 5, wherein grooves are shaped such that a firm locking is provided.
7. Heat exchanger according to any claim 3 to 6, wherein throughgoing holes are provided in the skeleton for accommodating ligaments between the coating on either side of the skeleton.
8. Scraper blade for use in a scraped surface heat exchanger comprising a metal skeleton having a sharp knife edge at one longitudinal side and connecting means near the opposite side, characterized in that the skeleton for the greater part is coated with polyalkene.
9. Scraper blade according to claim 8, wherein the skeleton is coated with polypropene.
10. Scraper blade according to any claim 8 or 9, wherein the skeleton is provided with a bare metal scraping edge.
11. Scraper blade according to claim 10, wherein grooves are arranged in the metal skeleton along the free edges of the coating.
12. Scraper blade according to any claim 8 to 11, wherein throughgoing holes are provided in the skeleton for accommodating ligaments between the coating on either side of the skeleton.
13. A method for preparing an ice confection product by cooling and agitating an ice mix in a scraped surface heat exchanger, comprising a stator and a rotor carrying scraping means, to generate ice crystals in said mix and thereafter freezing this partly frozen mix to a storage temperature of -18 C or less, wherein a heat exchanger is used, at least the surface of the rotor and of the scraping means mainly consisting of a polymer having non-adhesive properties with respect to the frozen ice mix.
14. A method according to claim 13, wherein the surface of the rotor and of the scraping means mainly consists of an unhalogenated polyalkene.
15. A method according to claim 14, wherein the surface of the rotor and of the scraping means mainly consists of polypropene.
16. An ice confection product obtainable by the method according to any claim 13 to 15.
GB8912240A 1989-05-26 1989-05-26 Ice-making apparatus and method Withdrawn GB2232469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8912240A GB2232469A (en) 1989-05-26 1989-05-26 Ice-making apparatus and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8912240A GB2232469A (en) 1989-05-26 1989-05-26 Ice-making apparatus and method

Publications (2)

Publication Number Publication Date
GB8912240D0 GB8912240D0 (en) 1989-07-12
GB2232469A true GB2232469A (en) 1990-12-12

Family

ID=10657467

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8912240A Withdrawn GB2232469A (en) 1989-05-26 1989-05-26 Ice-making apparatus and method

Country Status (1)

Country Link
GB (1) GB2232469A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0503274A1 (en) * 1991-03-08 1992-09-16 Carpigiani S.r.L. Stirring device for machines for the manufacture of ice-cream
US5485880A (en) * 1992-10-29 1996-01-23 Gerstenberg & Agger A/S Blade system for a scraped surface heat exchanger
WO1997040329A1 (en) * 1996-04-19 1997-10-30 Sunwell Engineering Company Limited Ice-making machine and heat exchanger therefor
DE19938044C1 (en) * 1999-08-12 2000-10-05 Fraunhofer Ges Forschung Ice generator for providing ice slurry uses stripping devices for removing ice from inside walls of parallel pipes for aqueous medium within heat exchanger
GB2381061A (en) * 2001-10-18 2003-04-23 John Edward Gough Dehumidifiers
DE102005039989A1 (en) * 2004-08-26 2006-03-02 Hartmut Higel Device for producing ice fragments out of a frozen liquid, in particular, water comprises a self-blocking adjustment unit for setting the distance between the ice scraper and the surface of the freezing roll
WO2009029233A1 (en) * 2007-08-23 2009-03-05 Moobella Llc Systems and methods of mixing and cooling food products
US8132424B2 (en) 2008-09-17 2012-03-13 Integrated Marine Systems, Inc. Ice machines with extruded heat exchanger
US11582985B2 (en) * 2019-06-21 2023-02-21 Ali Group S.R.L.—Carpigiani Stirrer of a machine for making liquid or semi-liquid products and machine comprising the stirrer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1387786A (en) * 1972-10-03 1975-03-19 Borsig Gmbh Scraperblade assembly
GB2226118A (en) * 1988-12-02 1990-06-20 Solmecs Corp Nv Ice generating apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1387786A (en) * 1972-10-03 1975-03-19 Borsig Gmbh Scraperblade assembly
GB2226118A (en) * 1988-12-02 1990-06-20 Solmecs Corp Nv Ice generating apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992015201A1 (en) * 1991-03-08 1992-09-17 Carpigiani S.R.L. Stirring device for machines for the manufacture of ice-cream
US5312184A (en) * 1991-03-08 1994-05-17 Carpigiani S.R.L. Ice-cream stirring device with stirring blades and scraping vanes
EP0503274A1 (en) * 1991-03-08 1992-09-16 Carpigiani S.r.L. Stirring device for machines for the manufacture of ice-cream
US5485880A (en) * 1992-10-29 1996-01-23 Gerstenberg & Agger A/S Blade system for a scraped surface heat exchanger
US6286332B1 (en) * 1996-04-19 2001-09-11 Sunwell Engineering Company Limited Ice-making machine and heat exchanger therefor
WO1997040329A1 (en) * 1996-04-19 1997-10-30 Sunwell Engineering Company Limited Ice-making machine and heat exchanger therefor
US5884501A (en) * 1996-04-19 1999-03-23 Goldstein; Vladimir Ice-making machine and heat exchanger therefor
DE19938044C1 (en) * 1999-08-12 2000-10-05 Fraunhofer Ges Forschung Ice generator for providing ice slurry uses stripping devices for removing ice from inside walls of parallel pipes for aqueous medium within heat exchanger
WO2001013052A1 (en) 1999-08-12 2001-02-22 Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. Ice generator for the production of an aqueous ice-crystal suspension
GB2381061A (en) * 2001-10-18 2003-04-23 John Edward Gough Dehumidifiers
DE102005039989A1 (en) * 2004-08-26 2006-03-02 Hartmut Higel Device for producing ice fragments out of a frozen liquid, in particular, water comprises a self-blocking adjustment unit for setting the distance between the ice scraper and the surface of the freezing roll
WO2009029233A1 (en) * 2007-08-23 2009-03-05 Moobella Llc Systems and methods of mixing and cooling food products
US8132424B2 (en) 2008-09-17 2012-03-13 Integrated Marine Systems, Inc. Ice machines with extruded heat exchanger
US11582985B2 (en) * 2019-06-21 2023-02-21 Ali Group S.R.L.—Carpigiani Stirrer of a machine for making liquid or semi-liquid products and machine comprising the stirrer

Also Published As

Publication number Publication date
GB8912240D0 (en) 1989-07-12

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