WO1996024251A1 - Method and device for baking-ovens - Google Patents

Method and device for baking-ovens Download PDF

Info

Publication number
WO1996024251A1
WO1996024251A1 PCT/SE1996/000153 SE9600153W WO9624251A1 WO 1996024251 A1 WO1996024251 A1 WO 1996024251A1 SE 9600153 W SE9600153 W SE 9600153W WO 9624251 A1 WO9624251 A1 WO 9624251A1
Authority
WO
WIPO (PCT)
Prior art keywords
trolley
oven
rotation
revolutions
baking
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/SE1996/000153
Other languages
French (fr)
Inventor
Jonas Persson
Lennart Larsson
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.)
Sveba-Dahlen AB
Original Assignee
Sveba-Dahlen AB
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 Sveba-Dahlen AB filed Critical Sveba-Dahlen AB
Priority to DE69609182T priority Critical patent/DE69609182T2/en
Priority to EP96902577A priority patent/EP0828423B1/en
Priority to DK96902577T priority patent/DK0828423T3/en
Priority to US08/875,455 priority patent/US5906855A/en
Priority to AT96902577T priority patent/ATE194263T1/en
Publication of WO1996024251A1 publication Critical patent/WO1996024251A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B1/00—Bakers' ovens
    • A21B1/42—Bakers' ovens characterised by the baking surfaces moving during the baking
    • A21B1/44—Bakers' ovens characterised by the baking surfaces moving during the baking with surfaces rotating in a horizontal plane

Definitions

  • the present invention relates to the baking of products in a baking over, more particularly an oven of the kind in which the products are supported by at least one rotary oven trolley.
  • a baking oven of this kind is known from SE 395 595 and EP 112 786.
  • the rotational direction of the trolley is reversed so as to lower or lift the trolley in the process of removing the same.
  • the trolley rotates in one direction during the actual baking process.
  • An object of the present invention is to improve still further the baking result in ovens provided with rotary trolleys. This object is achieved with the inventive method and inventive arrangement having the characteristic features set forth in the characterizing clauses of respective independent Claims.
  • This reversal of the direction of trolley rotation further improves the evenness to which the product is baked.
  • reversal of trolley rotation is effected during the baking process and is not effected with the aim of obtaining an improved baking result as a result of such reversal.
  • Fig. 1 is a side view of a baking oven provided with an arrangement according to the present invention
  • Fig. 2 illustrates the oven in Fig. 1 from above;
  • Fig. 3 is a longitudinal sectioned view of the oven shown in Fig. 1, taken on the line III-III;
  • Fig. 4 is a cross-sectional view of the oven shown in Fig. 1, taken on the line IV-IV.
  • a baking oven 1 which has two side walls 2 and 3, a back wall 4, a front wall 5, a door 6 fitted to the front wall, a roof 7 and a bottom 8. All parts 2-7 are heat insulated.
  • the oven 1 further includes a ceiling 9, an inner wall 10, and two perforated inner walls 11 and 12.
  • Mounted in the spaces between the walls 3, 12 and 10, 11 is a respective steam pack 13 and 14 which function to moisten the air within the oven, with hot steam.
  • Mounted in the space between the oven roof 7 and the inner wall 9 is a fan 15 which forces the air in the oven 1 to flow in the paths illustrated by arrows in Fig. 1.
  • a heat pack 16 for heating oven air is mounted between the side wall 2 and the inner wall 10. Connections to respective steam packs 13, 14, fan 15 and heat pack 16 have not been shown in the drawings since they are not required in obtaining an understanding of the invention. This also applies to ventilation openings.
  • An oven trolley 17 having wheels 18 that can also be rotated in the horizontal plane is shown inserted into the oven.
  • the oven trolley 17 includes a frame which supports a plurality of baking sheets 19.
  • Fig. 3 shows buns B placed on sheets 19.
  • Mounted centrally in the upper part of the trolley 17 is a suspension roller 21.
  • the roller 21 can be hooked onto a hook 20 which is connected to a shaft 22 that extends through the roof 7 and there connected to an electric motor 23 through the medium of a belt pulley 22a, which is fixedly mounted on the shaft 22, a toothed belt 24, a gear housing 25, and a toothed belt 26.
  • the motor 23 is reversible and is connected to a pulse counter 27 which counts the number of revolutions made by the motor 23 and when reaching a predetermined number of revolu ⁇ tions sends a pulse to the motor 23 and therewith cause the motor to rotate in the opposite.
  • the pulse counter 27 is therewith set to zero and again begins to count the number of revolutions made by the motor 23 in this reversed direc ⁇ tion. Subsequent to counting the same predetermined number of revolutions, the counter 27 sends a pulse to the motor 23, causing the direction of rotation to be again reversed.
  • Rotation of the motor 23 causes the oven trolley 17 to rotate about its vertical centre axis at a predetermined speed. Reversal of the direction of rotation of the motor 23 will also result in reversal of the direction of rotation of the oven trolley 17. It has been found suitable to reverse the direction of motor rotation subsequent to having rotated the oven trolley 17 through 2-15 revolutions, preferably about 5 revolutions, in each direction.
  • any other suitable counter may be used as an alternative to the pulse counter 27, such as a revolution counter, which is actuated by the shaft 22, for instance, and which causes the motor to reverse its direction of rotation subsequent to the shaft, and therewith the trolley 17, having rotated a predetermined number of revolu ⁇ tions.
  • the motor 23 can be connected to a timing clock which functions to cause the motor 23 to change its direction of rotation subsequent to the passage of a- predetermined time period, for instance 100 seconds, that has been set on the clock.
  • a motor which rotates in only one direction can be used as an alternative to a reversible motor 23, wherein there is arranged between the motor and the shaft 20 a mechanism which is actuated by impulses from, e.g., a pulse counter or a timing clock to reverse the rotational direction of the shaft 20.
  • the air heated by the heat pack 16 passes through the fan 15 and is forced downwards between the walls 3 and 12, where it is moistened by the steam pack 13, said pack normally delivering steam once on each baking occasion.
  • the space between these walls constitutes the pressure side of the oven.
  • the air is then forced through the holes in the wall 12 and passes between the sheets 19 carried by the rotating oven trolley 17, such as to bake the buns B.
  • the air then passes through the holes in the wall 11 and is moistened by the steam pack 14, once with each baking occasion.
  • the air then flows up between the walls 2 and 10, towards the heat pack 16.
  • the space between the walls 11 and 2 constitutes the suction side of the oven.
  • Fig. 4 shows from above a plate 19 and a plurality of buns B supported thereby.
  • the buns located furthest out in two corners are designated Bl and B2.
  • the bun Bl When the bun Bl reaches the position earlier occupied by the bun B2 , the bun Bl will be subjected to relatively small quantities of hot air and the opposite side of the bun Bl will therefore be baked to a lesser extent. This means that one side of the bun Bl will either be baked sufficiently or excessively, and that its other side is insufficiently or sufficiently baked as the oven trolley rotates in one direction over a large number of revolutions. This naturally applies to all buns B on the sheets 19.
  • the buns B will be baked equally on both sides.
  • the peripheral speed V2 of the buns Bl and B2 and the air speed VI are equally as great in both directions of rotation Rl and R2, one side of each bun Bl and B2 will be impinged upon at an air speed of (V1+V2 + (V1-V2. in the direction Rl, and the opposite side of the same bun will be impinged upon at an air speed of .V1-V2 + (V1+V2) in direction R2.
  • These air speeds are mutually identical, meaning that the air flowing between the sheets will have the same effect on both sides of the buns B when the trolley 17 rotates through the same number of revolutions in each rotational direction, and therewith provide a uniform baking result.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Baking, Grill, Roasting (AREA)
  • Processing Of Solid Wastes (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Tunnel Furnaces (AREA)
  • Drying Of Solid Materials (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • General Preparation And Processing Of Foods (AREA)

Abstract

A method pertaining to the baking of products (B) in a baking oven (1) in which the products are supported by at least one rotary oven trolley (17) comprises rotating the trolley through a number of revolutions in one direction (R1) during the baking process, and thereafter reversing the direction of rotation and continuing rotation of the trolley through several revolutions in the opposite direction (R2) before again reversing the rotation of direction of the trolley. The trolley (17) keeps one and the same axial position in both directions of rotation. An arrangement for carrying out the method includes a drive means (20-26) for alternating rotation of the oven trolley through an equal number of revolutions in two mutually opposite directions during the baking process.

Description

METHOD AND DEVICE FOR BAKING-OVENS
TECHNICAL FIELD
The present invention relates to the baking of products in a baking over, more particularly an oven of the kind in which the products are supported by at least one rotary oven trolley.
DESCRIPTION OF THE BACKGROUND ART
It is known, and generally common practice, to bake bread, buns, etc., in an oven wherein the bread, buns, etc. , are supported in tiers on oven plates or oven sheets carried by an oven trolley which can be moved into and out of the oven. The trolley can be connected to floor-mounted or ceiling- mounted drive means for rotating the trolley slowly about its vertical centre axis. The trolley is rotated to obtain more uniform baking of the product, therewith obtaining a product of better quality than would otherwise be the case.
A baking oven of this kind is known from SE 395 595 and EP 112 786. When the trolley is to be removed from the oven, The rotational direction of the trolley is reversed so as to lower or lift the trolley in the process of removing the same. The trolley rotates in one direction during the actual baking process.
SUMMARY OF THE INVENTION
An object of the present invention is to improve still further the baking result in ovens provided with rotary trolleys. This object is achieved with the inventive method and inventive arrangement having the characteristic features set forth in the characterizing clauses of respective independent Claims. This reversal of the direction of trolley rotation further improves the evenness to which the product is baked. In the aforesaid patent publications, reversal of trolley rotation is effected during the baking process and is not effected with the aim of obtaining an improved baking result as a result of such reversal.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side view of a baking oven provided with an arrangement according to the present invention;
Fig. 2 illustrates the oven in Fig. 1 from above;
Fig. 3 is a longitudinal sectioned view of the oven shown in Fig. 1, taken on the line III-III; and
Fig. 4 is a cross-sectional view of the oven shown in Fig. 1, taken on the line IV-IV.
DESCRIPTION OF PREFERRED EMBODIMENTS
There is shown a baking oven 1 which has two side walls 2 and 3, a back wall 4, a front wall 5, a door 6 fitted to the front wall, a roof 7 and a bottom 8. All parts 2-7 are heat insulated. The oven 1 further includes a ceiling 9, an inner wall 10, and two perforated inner walls 11 and 12. Mounted in the spaces between the walls 3, 12 and 10, 11 is a respective steam pack 13 and 14 which function to moisten the air within the oven, with hot steam. Mounted in the space between the oven roof 7 and the inner wall 9 is a fan 15 which forces the air in the oven 1 to flow in the paths illustrated by arrows in Fig. 1. A heat pack 16 for heating oven air is mounted between the side wall 2 and the inner wall 10. Connections to respective steam packs 13, 14, fan 15 and heat pack 16 have not been shown in the drawings since they are not required in obtaining an understanding of the invention. This also applies to ventilation openings.
An oven trolley 17 having wheels 18 that can also be rotated in the horizontal plane is shown inserted into the oven. The oven trolley 17 includes a frame which supports a plurality of baking sheets 19. Fig. 3 shows buns B placed on sheets 19. Mounted centrally in the upper part of the trolley 17 is a suspension roller 21. The roller 21 can be hooked onto a hook 20 which is connected to a shaft 22 that extends through the roof 7 and there connected to an electric motor 23 through the medium of a belt pulley 22a, which is fixedly mounted on the shaft 22, a toothed belt 24, a gear housing 25, and a toothed belt 26.
The motor 23 is reversible and is connected to a pulse counter 27 which counts the number of revolutions made by the motor 23 and when reaching a predetermined number of revolu¬ tions sends a pulse to the motor 23 and therewith cause the motor to rotate in the opposite. The pulse counter 27 is therewith set to zero and again begins to count the number of revolutions made by the motor 23 in this reversed direc¬ tion. Subsequent to counting the same predetermined number of revolutions, the counter 27 sends a pulse to the motor 23, causing the direction of rotation to be again reversed.
Rotation of the motor 23 causes the oven trolley 17 to rotate about its vertical centre axis at a predetermined speed. Reversal of the direction of rotation of the motor 23 will also result in reversal of the direction of rotation of the oven trolley 17. It has been found suitable to reverse the direction of motor rotation subsequent to having rotated the oven trolley 17 through 2-15 revolutions, preferably about 5 revolutions, in each direction.
It will be understood that any other suitable counter may be used as an alternative to the pulse counter 27, such as a revolution counter, which is actuated by the shaft 22, for instance, and which causes the motor to reverse its direction of rotation subsequent to the shaft, and therewith the trolley 17, having rotated a predetermined number of revolu¬ tions. Alternatively, the motor 23 can be connected to a timing clock which functions to cause the motor 23 to change its direction of rotation subsequent to the passage of a- predetermined time period, for instance 100 seconds, that has been set on the clock.
A motor which rotates in only one direction can be used as an alternative to a reversible motor 23, wherein there is arranged between the motor and the shaft 20 a mechanism which is actuated by impulses from, e.g., a pulse counter or a timing clock to reverse the rotational direction of the shaft 20.
The air heated by the heat pack 16 passes through the fan 15 and is forced downwards between the walls 3 and 12, where it is moistened by the steam pack 13, said pack normally delivering steam once on each baking occasion. The space between these walls constitutes the pressure side of the oven. The air is then forced through the holes in the wall 12 and passes between the sheets 19 carried by the rotating oven trolley 17, such as to bake the buns B. The air then passes through the holes in the wall 11 and is moistened by the steam pack 14, once with each baking occasion. The air then flows up between the walls 2 and 10, towards the heat pack 16. the space between the walls 11 and 2 constitutes the suction side of the oven.
Fig. 4 shows from above a plate 19 and a plurality of buns B supported thereby. The buns located furthest out in two corners are designated Bl and B2.
If it is assumed that the trolley 17 rotates in one single direction Rl, that the peripheral speed of each bun Bl, B2 will be V2, and that the hot, moist air passes between the sheets 19 at a speed of VI, then the bun Bl will be impinged upon at an air speed of V1+V2, whereas the bun Bl will be impinged upon at an air speed of VI-V2. This means that the bun Bl will be subjected to relatively large quantities of hot air with the result that the bun will be baked noticeably on the side thereof which faces forwardly in the direction of rotation. When the bun Bl reaches the position earlier occupied by the bun B2 , the bun Bl will be subjected to relatively small quantities of hot air and the opposite side of the bun Bl will therefore be baked to a lesser extent. This means that one side of the bun Bl will either be baked sufficiently or excessively, and that its other side is insufficiently or sufficiently baked as the oven trolley rotates in one direction over a large number of revolutions. This naturally applies to all buns B on the sheets 19.
On the other hand, if the trolley 17 rotates in alternate directions through one and the same number of revolutions, the buns B will be baked equally on both sides. When the peripheral speed V2 of the buns Bl and B2 and the air speed VI are equally as great in both directions of rotation Rl and R2, one side of each bun Bl and B2 will be impinged upon at an air speed of (V1+V2 + (V1-V2. in the direction Rl, and the opposite side of the same bun will be impinged upon at an air speed of .V1-V2 + (V1+V2) in direction R2. These air speeds are mutually identical, meaning that the air flowing between the sheets will have the same effect on both sides of the buns B when the trolley 17 rotates through the same number of revolutions in each rotational direction, and therewith provide a uniform baking result.
Although the invention has been described and illustrated with reference to only one embodiment together with some alternatives, it will be understood that the invention is not restricted hereto and that the invention is only limited by the scope of the following Claims.

Claims

1. A method of baking products (B) in an oven (1) in which the products are supported by at least one rotary oven trolley (17) , characterized by rotating the trolley (17) through part of or through several revolutions in one direction (Rl) , whereafter the rotational direction is reversed and rotation continued through part of or through several revolutions in the opposite direction (R2) before again reversing the direction of rotation, wherein rotation in both directions and the reversals in rotational directions take place during the baking process, and wherein the oven trolley retains the same axial position in both directions of rotation.
2. A method according to Claim 1, characterized by continu¬ ing rotation in one direction (Rl) through the same number of revolutions as rotation in the opposite direction (R2) .
3. A method according to Claim 1 or Claim 2, characterized by rotating the oven trolley in one and/or said opposite direction (Rl, R2) through 2-15 revolutions, preferably through about 5 (five) revolutions.
4. An arrangement for baking products (B) in a baking oven (1) in which the products are supported by at least one rotary oven-trolley (17) , wherein the oven has a pressure side from which hot air flows towards the trolley, and an opposing suction side to which air flows after heating the products, and wherein the arrangement includes drive means (20-26) for rotating the trolley in one direction, character¬ ized in that during the baking process the drive means (20- 26) can be actuated to reverse the direction of rotation (Rl, R2) of the trolley (17) ; and in that the oven trolley is adapted to retain one and the same axial position in both directions of rotation.
5. An arrangement according to Claim 4, characterized in that the drive means (20-26) includes a motor (23) mounted on the oven roof (7) or the oven floor (8) .
6. An arrangement according to Claim 5, characterized in that the motor (23) is reversible.
7. An arrangement according to any one of Claims 4-6, characterized by means (27) for causing the drive means (20- 26) to reverse the direction of rotation (Rl, R2) of the trolley (17) subsequent to a predetermined time period or subsequent to a predetermined number of revolutions.
PCT/SE1996/000153 1995-02-09 1996-02-08 Method and device for baking-ovens Ceased WO1996024251A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69609182T DE69609182T2 (en) 1995-02-09 1996-02-08 METHOD AND DEVICE FOR OVENS
EP96902577A EP0828423B1 (en) 1995-02-09 1996-02-08 Method and device for baking-ovens
DK96902577T DK0828423T3 (en) 1995-02-09 1996-02-08 Method and device for baking ovens
US08/875,455 US5906855A (en) 1995-02-09 1996-02-08 Method and device for baking food
AT96902577T ATE194263T1 (en) 1995-02-09 1996-02-08 METHOD AND APPARATUS FOR OVEN

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9500471A SE504670C2 (en) 1995-02-09 1995-02-09 Method and apparatus for baking products in a baking oven
SE9500471-9 1995-02-09

Publications (1)

Publication Number Publication Date
WO1996024251A1 true WO1996024251A1 (en) 1996-08-15

Family

ID=20397147

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000153 Ceased WO1996024251A1 (en) 1995-02-09 1996-02-08 Method and device for baking-ovens

Country Status (8)

Country Link
US (1) US5906855A (en)
EP (1) EP0828423B1 (en)
AT (1) ATE194263T1 (en)
DE (1) DE69609182T2 (en)
DK (1) DK0828423T3 (en)
ES (1) ES2150101T3 (en)
SE (1) SE504670C2 (en)
WO (1) WO1996024251A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034763A1 (en) * 2006-09-18 2008-03-27 Miwe Michael Wenz Gmbh Oven comprising a suspended baked good support

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1371290B1 (en) * 2002-06-15 2006-05-10 Werner & Pfleiderer Lebensmitteltechnik GmbH Rack oven
US6854456B1 (en) * 2002-09-04 2005-02-15 Friedrich Metal Products Co., Inc. Convection oven for bakery goods
DE102009043806B4 (en) * 2009-09-30 2011-06-09 Wachtel GmbH & Co. Bäckereimaschinen-Backöfen Rack Oven
US20140023977A1 (en) * 2012-07-17 2014-01-23 Honeyville Grain, Inc. Thermal processes of reducing foodborne pathogens in bagged food products
US9372000B2 (en) * 2012-10-05 2016-06-21 Illinois Tool Works Inc. Oven with recirculation of combustion exhaust gases
US8689681B1 (en) * 2013-07-19 2014-04-08 Vladimir Nozadze “VALDON”—a dual-purpose bread baking oven
TW201542993A (en) * 2014-05-09 2015-11-16 Chroma Ate Inc Heating furnace
KR102746975B1 (en) * 2023-11-06 2024-12-26 주식회사 나만 Cooking trolley and oven system including therewith

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE395595B (en) * 1975-12-11 1977-08-22 Dahlen Elektro Ab DEVICE FOR BAKING AND / OR COOKING OVEN
EP0041287A2 (en) * 1980-05-30 1981-12-09 Elektro-Dahlén AB A bakery oven and an oven cart which can be received therein
EP0112786A1 (en) * 1982-11-26 1984-07-04 Pavailler, Société Anonyme: Device for suspending, lifting and rotating a wagon within a confined area
EP0173005A2 (en) * 1984-08-28 1986-03-05 Werner & Pfleiderer GmbH Oven with hot air recirculation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE408256C (en) * 1977-11-29 1981-07-13 Tipe Revent Ab CONVECTION OVEN WITH WATER-IRRIGABLE, ACCUMULATED HEAT BODY
US4162141A (en) * 1977-12-27 1979-07-24 West Clarence W Variable air flow oven

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE395595B (en) * 1975-12-11 1977-08-22 Dahlen Elektro Ab DEVICE FOR BAKING AND / OR COOKING OVEN
EP0041287A2 (en) * 1980-05-30 1981-12-09 Elektro-Dahlén AB A bakery oven and an oven cart which can be received therein
EP0112786A1 (en) * 1982-11-26 1984-07-04 Pavailler, Société Anonyme: Device for suspending, lifting and rotating a wagon within a confined area
EP0173005A2 (en) * 1984-08-28 1986-03-05 Werner & Pfleiderer GmbH Oven with hot air recirculation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008034763A1 (en) * 2006-09-18 2008-03-27 Miwe Michael Wenz Gmbh Oven comprising a suspended baked good support

Also Published As

Publication number Publication date
EP0828423B1 (en) 2000-07-05
US5906855A (en) 1999-05-25
SE9500471L (en) 1996-08-10
ES2150101T3 (en) 2000-11-16
SE9500471D0 (en) 1995-02-09
ATE194263T1 (en) 2000-07-15
EP0828423A1 (en) 1998-03-18
DK0828423T3 (en) 2000-10-23
SE504670C2 (en) 1997-03-24
DE69609182D1 (en) 2000-08-10
DE69609182T2 (en) 2001-03-22

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