EP0538925A1 - Air-cooled oven, in particular for packaging products with heat-shrinkable film - Google Patents
Air-cooled oven, in particular for packaging products with heat-shrinkable film Download PDFInfo
- Publication number
- EP0538925A1 EP0538925A1 EP92202986A EP92202986A EP0538925A1 EP 0538925 A1 EP0538925 A1 EP 0538925A1 EP 92202986 A EP92202986 A EP 92202986A EP 92202986 A EP92202986 A EP 92202986A EP 0538925 A1 EP0538925 A1 EP 0538925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oven
- air
- tunnel
- heat
- jacket
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
- B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
- B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
- B65B53/063—Tunnels
Definitions
- This invention relates to an air-cooled oven intended particularly but not exclusively for packaging products with heat-shrinkable film.
- These comprise a first stage in which the product is wrapped and possibly sealed in a film of heat-shrinkable material, and a second stage in which the product wrapped in the film is fed into a hot air circulation oven which shrinks the film onto the product or products to be packaged.
- Ovens of this type consist structurally of a metal chamber or tunnel provided internally with electrical resistance elements for heating the air, which is circulated by one or more fans.
- the product or products to be packaged are fed, wrapped in the film, through the tunnel by a roller or belt conveyor.
- the temperature of the working environment in the vicinity of the oven can consequently become unbearable, and the oven can represent a source of danger to persons who accidentally touch its walls, by causing serious burns.
- a further drawback of ovens of known type is that the conveyor rollers or belt extending through the tunnel are subjected to heating, with the result that the film wrapping the package tends to melt, hence sticking to the rollers and running down. This results in improper conveyor operation and an imperfect final package.
- the main object of the present invention is to obviate the aforesaid drawbacks of the known art, this object being attained according to the invention by an oven, particularly for packaging products with heat-shrinkable film, of the type comprising a chamber or tunnel (10) structurally in the form of an inner jacket (15) through which hot air is circulated by a first fan (20) driven by a motor (19), and an outer insulating jacket (17), characterised in that cold ventilation air is circulated through said outer jacket (17).
- ventilation air is circulated by a second fan (21) keyed onto the exit shaft (22) of the motor (19) which drives the first fan (20) circulating hot air.
- said ventilation air is drawn in through a series of apertures (25) provided in the tunnel roof, and is discharged through a series of apertures (27) provided at the base of the tunnel.
- the air-cooled oven consists structurally of a metal chamber or tunnel 10 mounted on a base frame 11 which rests on legs 12.
- the base frame also carries a conveyor for passing the products to be packaged (not shown) through the tunnel 10, this tunnel in the illustrated embodiment consisting of a series of rollers 13 driven by a motor 14.
- the tunnel 10 comprises an inner hot air circulation jacket 15 covered externally with a layer of insulating material 16, and an outer cold air circulation jacket 17.
- the reference numeral 18 indicates a series of air-heating electrical resistance elements provided in the side of the inner jacket 15.
- a motor 19 mounted on the top of the tunnel 10 drives a first fan 20 for hot air circulation, housed within the inner jacket 15, and a second fan 21 for cold air circulation, housed within the outer jacket 17.
- said two fans are keyed onto the same exit shaft 22 of the motor 19.
- the air heated within the inner jacket 15 by the electrical resistance elements 18 is fed by the fan 20 into the heated compartment 23 of the tunnel 10 through a series of apertures 24 provided in the side walls of the inner jacket 15.
- the ventilation air is drawn in by the fan 21 through a series of apertures 25 provided in the roof of the tunnel 10, and is circulated through the outer jacket 17 in the directions indicated by the arrows 26, to be then discharged through a series of apertures 27 provided at the base of the tunnel in the frame 11, as clearly shown in Figures 2 and 3.
- the ventilation air grazes the conveyor rollers 13, so maintaining them at a temperature such as to prevent the package film melting.
- the outer wall of the tunnel 10 remains during its entire operating period always at a low non-dangerous temperature which has no effect on the surrounding environment, even if operation is continuous for several hours.
- the ventilation air discharged through the apertures 27 can be piped to the outside of the working environment.
- the air-cooled oven according to the invention can be constructed at minimum cost compared with an insulated oven, as it is necessary to merely provide the second fan 21 and the apertures 25, 27 for intake and discharge of ventilation air respectively. This is because the outer jacket 17 is already provided, it being necessary merely to increase its height to enable it to contain the fan 21.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Packages (AREA)
- Vacuum Packaging (AREA)
Abstract
Description
- This invention relates to an air-cooled oven intended particularly but not exclusively for packaging products with heat-shrinkable film.
- As is well known to the expert of the art, products can be packaged in heat-shrinkable film in two successive stages.
- These comprise a first stage in which the product is wrapped and possibly sealed in a film of heat-shrinkable material, and a second stage in which the product wrapped in the film is fed into a hot air circulation oven which shrinks the film onto the product or products to be packaged.
- Ovens of this type consist structurally of a metal chamber or tunnel provided internally with electrical resistance elements for heating the air, which is circulated by one or more fans.
- The product or products to be packaged are fed, wrapped in the film, through the tunnel by a roller or belt conveyor.
- Ovens of this type produce a considerable quantity of heat, and even though the tunnel walls comprise not only an inner jacket containing the resistance elements but also an outer insulated jacket, continuous use of the oven results in the outer jacket reaching a temperature exceeding 50°C within a very short time.
- The temperature of the working environment in the vicinity of the oven can consequently become unbearable, and the oven can represent a source of danger to persons who accidentally touch its walls, by causing serious burns.
- A further drawback of ovens of known type is that the conveyor rollers or belt extending through the tunnel are subjected to heating, with the result that the film wrapping the package tends to melt, hence sticking to the rollers and running down. This results in improper conveyor operation and an imperfect final package.
- The main object of the present invention is to obviate the aforesaid drawbacks of the known art, this object being attained according to the invention by an oven, particularly for packaging products with heat-shrinkable film, of the type comprising a chamber or tunnel (10) structurally in the form of an inner jacket (15) through which hot air is circulated by a first fan (20) driven by a motor (19), and an outer insulating jacket (17), characterised in that cold ventilation air is circulated through said outer jacket (17).
- Preferably said ventilation air is circulated by a second fan (21) keyed onto the exit shaft (22) of the motor (19) which drives the first fan (20) circulating hot air.
- Preferably said ventilation air is drawn in through a series of apertures (25) provided in the tunnel roof, and is discharged through a series of apertures (27) provided at the base of the tunnel.
- The structural and operational characteristics of the invention and its advantages over the known art will be more apparent from an examination of the following description, given with reference to the accompanying schematic drawings, which show one embodiment of an oven incorporating the principles of the invention. On the drawings:
- Figure 1 is a perspective view of the oven according to the invention;
- Figure 2 is a section on the line II-II of Figure 3;
- Figure 3 is a section on the line III-III of Figure 2;
- Figure 4 is a top plan view in the direction of the arrow F of Figure 3; and
- Figure 5 is a plan view taken from below in the direction of the arrow F1 of Figure 3.
- With reference to the drawings, the air-cooled oven according to the invention consists structurally of a metal chamber or
tunnel 10 mounted on abase frame 11 which rests onlegs 12. The base frame also carries a conveyor for passing the products to be packaged (not shown) through thetunnel 10, this tunnel in the illustrated embodiment consisting of a series ofrollers 13 driven by amotor 14. - With particular reference to Figure 2, the
tunnel 10 comprises an inner hotair circulation jacket 15 covered externally with a layer ofinsulating material 16, and an outer coldair circulation jacket 17. - The
reference numeral 18 indicates a series of air-heating electrical resistance elements provided in the side of theinner jacket 15. - A
motor 19 mounted on the top of thetunnel 10 drives afirst fan 20 for hot air circulation, housed within theinner jacket 15, and asecond fan 21 for cold air circulation, housed within theouter jacket 17. As can be clearly seen from the drawings, said two fans are keyed onto thesame exit shaft 22 of themotor 19. - The air heated within the
inner jacket 15 by theelectrical resistance elements 18 is fed by thefan 20 into theheated compartment 23 of thetunnel 10 through a series ofapertures 24 provided in the side walls of theinner jacket 15. - The ventilation air is drawn in by the
fan 21 through a series ofapertures 25 provided in the roof of thetunnel 10, and is circulated through theouter jacket 17 in the directions indicated by thearrows 26, to be then discharged through a series ofapertures 27 provided at the base of the tunnel in theframe 11, as clearly shown in Figures 2 and 3. - It can also be seen that the ventilation air grazes the
conveyor rollers 13, so maintaining them at a temperature such as to prevent the package film melting. - In this manner it is apparent that the heat provided within the oven and transmitted to the outside is removed by the cold ventilation air which continuously circulates within the
outer jacket 17. - In this manner the outer wall of the
tunnel 10 remains during its entire operating period always at a low non-dangerous temperature which has no effect on the surrounding environment, even if operation is continuous for several hours. - If required, the ventilation air discharged through the
apertures 27 can be piped to the outside of the working environment. - Finally, it should be noted that the air-cooled oven according to the invention can be constructed at minimum cost compared with an insulated oven, as it is necessary to merely provide the
second fan 21 and theapertures outer jacket 17 is already provided, it being necessary merely to increase its height to enable it to contain thefan 21. - The object stated in the introduction to the description is therefore attained.
Claims (3)
- An oven, particularly for packaging products with heat-shrinkable film, of the type comprising a chamber or tunnel (10) structurally in the form of an inner jacket (15) through which hot air is circulated by a first fan (20) driven by a motor (19), and an outer insulating jacket (17), characterised in that cold ventilation air is circulated through said outer jacket (17).
- An oven as claimed in claim 1, characterised in that said ventilation air is circulated by a second fan (21) keyed onto the exit shaft (22) of the motor (19) which drives the first fan (20) circulating hot air.
- An oven as claimed in claim 2, characterised in that said ventilation air is drawn in through a series of apertures (25) provided in the tunnel roof, and is discharged through a series of apertures (27) provided at the base of the tunnel.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI912723A IT1251929B (en) | 1991-10-15 | 1991-10-15 | AIR-COOLED OVEN, IN PARTICULAR FOR THE PACKAGING OF PRODUCTS WITH HEAT-SHRINK FILM. |
ITMI912723 | 1991-10-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0538925A1 true EP0538925A1 (en) | 1993-04-28 |
EP0538925B1 EP0538925B1 (en) | 1996-06-12 |
Family
ID=11360866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92202986A Expired - Lifetime EP0538925B1 (en) | 1991-10-15 | 1992-09-29 | Air-cooled oven, in particular for packaging products with heat-shrinkable film |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0538925B1 (en) |
DE (1) | DE69211479T2 (en) |
DK (1) | DK0538925T3 (en) |
ES (1) | ES2091398T3 (en) |
IT (1) | IT1251929B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102897355A (en) * | 2011-07-25 | 2013-01-30 | 克罗内斯股份公司 | Shrinkage device with container cooling |
WO2014127790A1 (en) * | 2013-02-22 | 2014-08-28 | Khs Gmbh | Shrink tunnel system and associated method for shrinking a shrink film onto package formations |
CN104245517A (en) * | 2012-03-23 | 2014-12-24 | 段力军 | An open-style heat-shrink wrapping system for the protection of luggage |
EP3932814A1 (en) * | 2020-06-30 | 2022-01-05 | Krones Aktiengesellschaft | Shrink tunnel and method for shrinking thermoplastic packaging material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106586126A (en) * | 2016-11-17 | 2017-04-26 | 长兴向荣模具有限公司 | Novel heat-shrinkable film packaging device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3378989A (en) * | 1965-02-24 | 1968-04-23 | Doughboy Ind Inc | Packaging machinery |
US3668817A (en) * | 1966-11-18 | 1972-06-13 | Grace W R & Co | Shrink tunnel and method of shrinking film on articles |
US3744146A (en) * | 1970-06-02 | 1973-07-10 | Mill Eng Inc | Shrink tunnel |
DE3924871A1 (en) * | 1989-07-27 | 1991-02-07 | Dieter Kicherer | Shrinking tunnel for foil wrappings - uses gaseous heat transfer medium with adjustable heat content |
-
1991
- 1991-10-15 IT ITMI912723A patent/IT1251929B/en active IP Right Grant
-
1992
- 1992-09-29 DK DK92202986.3T patent/DK0538925T3/en active
- 1992-09-29 DE DE69211479T patent/DE69211479T2/en not_active Expired - Fee Related
- 1992-09-29 ES ES92202986T patent/ES2091398T3/en not_active Expired - Lifetime
- 1992-09-29 EP EP92202986A patent/EP0538925B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3378989A (en) * | 1965-02-24 | 1968-04-23 | Doughboy Ind Inc | Packaging machinery |
US3668817A (en) * | 1966-11-18 | 1972-06-13 | Grace W R & Co | Shrink tunnel and method of shrinking film on articles |
US3744146A (en) * | 1970-06-02 | 1973-07-10 | Mill Eng Inc | Shrink tunnel |
DE3924871A1 (en) * | 1989-07-27 | 1991-02-07 | Dieter Kicherer | Shrinking tunnel for foil wrappings - uses gaseous heat transfer medium with adjustable heat content |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102897355A (en) * | 2011-07-25 | 2013-01-30 | 克罗内斯股份公司 | Shrinkage device with container cooling |
CN102897355B (en) * | 2011-07-25 | 2016-02-03 | 克罗内斯股份公司 | With the compressive shrinkage machines of article collection cooling piece |
CN104245517A (en) * | 2012-03-23 | 2014-12-24 | 段力军 | An open-style heat-shrink wrapping system for the protection of luggage |
CN104245517B (en) * | 2012-03-23 | 2017-08-01 | 段力军 | A kind of open thermal contraction encapsulation system for being used to protect luggage |
WO2014127790A1 (en) * | 2013-02-22 | 2014-08-28 | Khs Gmbh | Shrink tunnel system and associated method for shrinking a shrink film onto package formations |
US10011382B2 (en) | 2013-02-22 | 2018-07-03 | Khs Gmbh | Shrink tunnel system and associated method for shrinking a shrink film onto package formations |
EP3932814A1 (en) * | 2020-06-30 | 2022-01-05 | Krones Aktiengesellschaft | Shrink tunnel and method for shrinking thermoplastic packaging material |
Also Published As
Publication number | Publication date |
---|---|
ITMI912723A0 (en) | 1991-10-15 |
IT1251929B (en) | 1995-05-27 |
DK0538925T3 (en) | 1996-10-28 |
DE69211479T2 (en) | 1997-02-06 |
ITMI912723A1 (en) | 1993-04-15 |
DE69211479D1 (en) | 1996-07-18 |
EP0538925B1 (en) | 1996-06-12 |
ES2091398T3 (en) | 1996-11-01 |
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