EP2687447A1 - Shrinking device with optimised energy management - Google Patents

Abstract

The device (1') has a conveying device (10) for an article such as beverage container, and a fan (18) for creation of contraction medium (19) such as hot air. A heating coil (20) is arranged for controlling the temperature of the contraction medium, and a division device is arranged for division of the contraction medium into two sub-streams. A set of heating units or nozzle surface (15) is arranged, where one of the heating unit is arranged for heating the conveying device. The division device comprises a control unit for automated control of division of the medium into two sub-streams. An independent claim is also included for a method for adjusting different operating modes of a contraction device.

Description

The present invention relates to a shrinking device and a method of heat shrinking film around articles or article assemblies according to the features of the preambles of claims 1 and 8.

When packaging articles, in particular beverage containers, bottles, etc., into containers, the articles are assembled in the desired manner and covered with a shrink film. The shrink wrap is shrunk around the articles by supplying shrinkage medium, such as hot air, in a shrink tunnel.

FIG. 1 shows a schematic view of a shrinking device 1 according to the known prior art. Articles, in particular beverage containers, bottles 6, cans or the like are assembled in groups and wrapped with shrink film 7. These wrapped article assemblies are also referred to as containers 5. The containers 5 are fed in the direction of transport TR on a means of transport, in particular a conveyor belt 10 or the like, via an input region 3 to a shrink tunnel 2. In the shrink tunnel 2 heating means are arranged, via which the container 5 with a shrinking medium 19, for example, with hot air, are acted upon. As a result, the film 7 shrinks the outer packaging and places itself on all sides of the article or bottles 6 and thus forms the finished container 5 *. For example, the side wall surfaces 14 facing the interior of the shrink tunnel 2 are at least partially designed as nozzle surfaces 15 with a plurality of nozzles through which the shrinkage medium 19 is blown into the interior of the shrink tunnel 2. Furthermore, shrinkage medium 19 is blown through the conveyor belt 10 to the bottom region of the container 5. The shrinkage medium 19 is generated, for example, by a blower 18, supplied to a heating register 20, separated by means of throttle valves 22 and distributed to the different heating means of the shrinking tunnel 2. In particular, a first throttle valve 22a divides a part of the shrinkage medium flow for the nozzle surface 15 and a second throttle valve 22b another part for the bottom nozzle 16 of the container bottom side. The setting of the throttle valves 22a, 22b for dividing the Schrumpfmedium- stream is carried out manually.

The permanent supply of hot shrinkage medium 19 via the bottom nozzle 16 leads to a strong heating of the conveyor belt 10. The conveyor belt 10 can thereby reach the melting temperature of the shrink film 7, causing unwanted deposits and adhesions of the shrink film 7 on the conveyor belt comes. In order to avoid excessive heating of the conveyor belt 10, this is specifically cooled when returning against the transport direction TR of the container 5. In the exit region 4 of the shrinking device 1, first coolant fans 24a are therefore arranged, with which a coolant 26, for example cold air, is blown onto the conveyor belt 10. Alternatively, heat exchangers or similar. suitable means are used to absorb the excess heat. For example, the conveyor belt 10 after passing through the shrink tunnel 2, a temperature T2 of about 105 ° C to 120 ° C, which would increase further in a new pass through the shrink tunnel 2. In addition to the first coolant fan 24a already described, further fans 24b may be provided, which after the reversal of direction blow cold air 26 on the region 10 * of the conveyor belt 10 running counter to the transport direction TR, so that this reaches a temperature T1 of approximately 60.degree - 80 ° C is cooled before it reaches the entrance area 3 again.

At idle times, i. if the tunnel is to be retrofitted for the next product or similar, the temperature in the shrink tunnel should, if possible, be kept at a defined target standby temperature, which then enables a rapid resumption of production. Since in this case no items with shrink film or similar. are transported through the tunnel, the required heating power is reduced to maintain the desired target StandBy temperature compared to the production operation. This is conventionally achieved by throttling the heating power of the fan.

The publication US 2004/0083687 A1 describes a control system for monitoring energy consumption in a shrink tunnel. It is provided that a control means puts the shrink tunnel in a power-saving mode when a processing module preceding the shrink tunnel remains unused for a while. In energy-saving mode, the speed of the conveyor and the power of the fan heater are adjusted.

The object of the invention is to provide a shrink tunnel with an optimized energy management, in which, in particular in standby phases, a basic temperature can be maintained, wherein the energy consumption is largely minimized. Another objective is to shorten the wake-up times, ie the time required to heat a shrink tunnel from a standby temperature to a desired setpoint operating temperature.

The above object is achieved by a shrinking device and a method comprising the features in claims 1 and 8. Further advantageous embodiments are described by the subclaims.

The invention relates to a shrinking device with a conveying device for articles or article assemblies, which preferably serves to shrink film and / or shrink labels or the like. to shrivel articles or article compilations. The shrinking device comprises at least one device for producing the shrinking medium, for example a hot air blower. Furthermore, the device comprises a device for controlling the temperature of the shrinking medium, in particular a heating register. Thereby, the temperature of the shrinking medium can be regulated as needed. The shrinkage medium stream is divided by a dividing device into at least two shrinkage medium substreams. The first shrinkage medium partial flow is supplied to at least a first heating means, via which the articles or article compositions are acted upon from the side and / or from above with shrinking medium. For example, these are shaft walls with nozzle surfaces arranged parallel to the transport route, via which the shrinkage medium is injected into the interior of the shrinking device. The second shrinkage medium partial flow is supplied to at least one second heating means. For example, this is a shaft arranged below the transport path with nozzle openings arranged on the top side. The conveying device is heated to a corresponding temperature via this shaft or the shrinking medium is injected through the conveying device onto the underside of the articles or article assemblies.

According to the invention, the distribution device for dividing the shrinkage medium flow is assigned at least one device for the automated control of the same. This also serves as a device for the controlled setting of predefined operating states in the shrinking device. According to a preferred embodiment, the at least one distribution device for dividing the shrinking medium comprises at least two throttle valves. The first throttle valve is connected to a first supply via which the shrinkage medium of the first partial flow is supplied to the first heating means. The second throttle valve is connected to a second supply, via which the shrinkage medium of the second partial flow is supplied to the second heating means. The throttle valves each comprise an adjusting means, in particular an actuator, a setting cylinder or another suitable means, which via a Control unit can be regulated. In particular, the throttle valves are adjusted via the adjustment means according to predefined operating conditions.

In particular, at least two operating states can be set by the control unit. A first operating state defines a first setpoint operating temperature which is to prevail in the interior of the shrinking device during ongoing production operation. This setpoint operating temperature is set via a defined first supply of shrinkage medium via the at least one first heating means and via a defined second supply of shrinkage medium via the at least one second heating means. There may be provided temperature sensors within the interior of the shrinking device and / or on the transport path or conveying device, which control and monitor the temperature of the interior and / or the conveying device. By feedback of the temperature sensors with the control unit, the supply of shrinkage medium via the first and / or the second heating means is adjusted accordingly.

A second operating state defines a standby mode with a defined second setpoint standby temperature in the interior of the shrinking device. This StandBy operation is particularly used in short-term production stoppages, for example, when the shrinking device for new products has to be converted, when an interruption of operation due to lack of replenishment etc. In standby mode, the temperature in the interior of the shrinking device is maintained at a level a quick heating to the production temperature and thus a quick resumption of production allows. In standby mode, the second throttle or similar. for the supply of the second shrinkage medium partial flow to the second heating means preferably completely closed. In order to ensure sufficient temperature control of the interior of the shrinking device, if necessary, the first throttle valve must be opened further or completely and thus the outflow of shrinking medium can be increased over the first heating medium. The StandBy temperature can in turn be determined and adjusted via sensors.

The control unit may include the programs for other operating conditions, such as different production operating conditions with different production target temperatures, different StandBy operating conditions with different target standby temperatures for longer or shorter breaks, different heating programs with shorter or longer heat-up times, different cooling programs Etc.

By means of the control unit and the method according to the invention, it can be defined, for example, that all throttle valves are opened maximally for heating the shrink tunnel, so that a maximum first and a maximum second supply of shrinkage medium via the first heating means and the second heating means are effected by a high Flow of shrinking medium to minimize the heating or WakeUp time of the shrinking device. By "wake-up time" is meant, in particular, the period of time required to produce the state of production of the shrinking device, i. to heat the shrinking device from the set standby temperature to the required setpoint operating temperature. The problem here could be that the conveyor is heated too much and therefore must be counteracted accordingly already during heating of the interior of the shrinking tunnel by cooling the returning conveyor chain. This is energetically unfavorable. On the other hand, if the time factor is less relevant, it may be energetically more advantageous to open only the first throttle valve for heating up and not or only partially open the second throttle valve so that at least a maximum first supply of shrinkage medium takes place via the first heating means.

The invention further relates to a method for setting different operating states of a shrinking device. In particular, the temperature in the interior of the shrink tunnel is adjusted via the regulation of the supply of shrinkage medium. On the one hand, the temperature of the supplied shrinking medium can be regulated via the heat output of the controllable device for controlling the temperature of the shrinking medium, for example a heating register associated with the hot air blower. Furthermore, the supply of shrinkage medium to the different heating means of the shrinking device can be regulated by a control unit, preferably via a controlled adjustment of a distribution device, in particular via the setting of throttle valves. The control unit contains the basic data and / or programs for desired operating states or can be programmed accordingly. For example, the control unit to control the activation of certain operating states according to a defined time program, the regulation is done in each case by adjusting, in particular opening and / or at least partially closing the throttle by means of controlled actuators.

As has already been described in the context of the device, the second throttle valve in standby mode is preferably completely closed, so that the heating of the conveyor device is minimized since no supply of shrinkage medium takes place from below. Instead, the conveyor only heats up due to the temperature prevailing in the interior of the shrinking device. In order to get the shrinking device ready for use again in a very short time, all throttle valves can be opened to a maximum for heating up the shrinking tunnel in order to minimize the heating or wake-up time by means of a high flow of shrinking medium. Once the necessary operating temperature in the interior of the shrinking device and possibly the desired temperature of the conveyor is reached, the throttle valves are adjusted according to the predetermined operating program and production can begin, in particular, the shrink-wrapped products or article compositions of the shrinking device can be supplied.

During ongoing production operation, it can be provided that the temperature in the interior of the shrinking device and / or the temperature of the conveying device are continuously monitored by sensors. In the case of a deviation of the measured actual temperature from the desired setpoint temperature, for example, the temperature of the supplied shrinking medium is adjusted accordingly by regulating the heating power of the controllable device for controlling the temperature of the shrinking medium. In this embodiment of the invention, there is thus no change in at least one volume flow during ongoing production operation.

According to an alternative embodiment, the setting and / or maintenance of the operating states can be monitored via at least one temperature sensor in the interior of the shrinking device and adapted by controlling the volume flow of shrinking medium. In the case of monitoring a production operating state, a first temperature sensor determines a current actual temperature value and transmits it to the control unit. The actual temperature value is compared with a setpoint temperature value; in particular, the deviation between the actual temperature value and the setpoint temperature value is determined. With a deviation .DELTA.T, for example, at a deviation .DELTA.T of more than 1 ° C, the actuators are controlled by the control unit and reset the throttle. If the actual temperature value is below the setpoint temperature value, the throttle valves are opened further. On the other hand, if the actual temperature value is above the setpoint temperature value, the throttle valves are closed further. For monitoring the production conditions, at least one second temperature sensor may further be provided, which measures the actual temperature in the region of the conveying device and balances it with a predetermined desired temperature value.

In the case of monitoring a second StandBy operating state according to the alternative embodiment, a temperature sensor determines the actual temperature in Interior of the shrinking device and compensates this value with the stored in the control unit target standby temperature from. With a deviation .DELTA.T the actual temperature of the defined target StandBy temperature, for example at a deviation .DELTA.T of more than 1 ° C, in particular the actuators of the first throttle valves are activated and the setting of the first throttle valves and thus the supply of shrinking medium the regulated at least a first heating means. The second throttle valve for supplying shrinking medium to the at least one second heating means, however, remains closed.

The method thus makes it possible to set a plurality of operating states which follow one another in a predefined time grid via the control unit. In particular, the operating conditions are set automatically by controlled regulation of the at least one distribution device for dividing the shrinking medium.

In summary, the invention is characterized in that the distribution and supply of the shrinking medium to the different heating means via an intelligent control unit. The conveying device represents the largest energy consumer of the shrinking device, since it is heated on the one hand when passing through the shrink tunnel in the transport direction by supplying shrinking medium and then cooled again in the return. By no Anüsung the conveyor with shrinking medium in the case of a production stop takes place, but a regulation of the target StandBy temperature in the shrinking device by an increased supply of shrinkage medium via the at least one first heating means, the conveyor is heated less in standby mode. Thus, it is not necessary to cool them to the same extent as in the normal production operation. By keeping the shrinking device at a set standby temperature even during a production stop, the so-called wake-up times can be shortened. The heating time can be minimized in particular by opening all throttle valves of the distribution device to a maximum. At the same time, however, there is a risk that the conveyor will overheat. A sensor can determine the temperature of the conveying device and optionally a cooling device can be activated for the corresponding counter-control.

The device according to the invention and the method according to the invention allow a faster heating of the shrinking device to the production temperature by means of an intelligent control of the dividing device. This increases the availability of the shrinking device. With appropriate sensors can overheat the conveyor can be prevented, which would lead, inter alia, to a hole in the bottom area of the outer packaging of the container. Preferably, conventional shrinking devices according to the invention can be retrofitted with adjustment means, in particular actuators or the like, and control units to enable intelligent, automated control of the splitting device.

• Figur 1 zeigt eine schematische Ansicht einer Schrumpfvorrichtung gemäß dem bekannten Stand der Technik und wurde bereits beschrieben.
• Figur 2 zeigt eine schematische Ansicht einer Schrumpfvorrichtung mit erfindungsgemäßem Energiemanagement.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration.

• FIG. 1 shows a schematic view of a shrinking device according to the known prior art and has already been described.
• FIG. 2 shows a schematic view of a shrinking device with inventive energy management.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are merely examples of how the device or method of the invention may be configured and are not an exhaustive limitation.

FIG. 2 shows a schematic view of a shrinking device 1 * with inventive energy management. The shrinking device 1 * is similar in large parts to the shrinking device 1 known from the prior art (cf. FIG. 1 ), to the description of which reference is hereby made. The throttle valves 22a, 22b are each associated with actuators 40a, 40b with which the throttle valves 22a, 22b can be opened or closed. The actuators 40a, 40b are connected to a control unit 50, so that the adjustment of the throttle valves 22a, 22b via the actuators 40a, 40b by the control unit 50 can in particular be continuously regulated. In particular, the control unit 50 contains parameters of different operating states. Depending on the selected operating state, the shrinkage medium partial flows are adjusted accordingly.

In a first production operating state, for example, it is provided that a first defined partial flow of shrinkage medium 19 via the first throttle valve 22a and a first supply line 30a for the nozzle surface 15 and a second defined partial flow via the second throttle valve 22b and a second supply line 30b for the bottom nozzle 16 of the container bottom side is divided.

According to one embodiment of the invention, a first temperature sensor 23a may be provided. This determines the temperature T2 of the conveyor chain 10 in the output region 4 of the shrinking device 1 * and transmits the corresponding values to the control unit 50. This controls the coolant fan 24a and / or 24b, so that the conveyor chain 10 is supplied with coolant 26 and cooled accordingly, before again containers (cf. FIG. 1 ) are transported on it. In the entrance area 3 of the shrinking device 1 *, a second temperature sensor 23b may be provided, via which the sufficient cooling of the conveyor chain 10 is controlled. If the temperature T1 determined by the second temperature sensor 23b deviates from a defined target temperature stored in the control unit 50, the supply of coolant 26 is adjusted by the control unit 50.

The control unit 50 controls and controls further programmed operating states. For example, the control unit 50 may contain the desired key data for a so-called standby operation. This StandBy operation is used in particular for short-term production stoppages, for example when the shrinking device 1 * has to be temporarily converted for new products, with a short interruption of the operation due to lack of supply of products to be processed, etc. In this standby mode, the internal temperature in the shrink tunnel 1 * should not fall below a defined target standby temperature, however, the energy consumption that is required to maintain this target standby temperature should be as low as possible. As already described, it is particularly energy-intensive to cool the conveyor chain 10 which has been heated in the shrinking tunnel 2 by the supply of shrinkage medium 19 during the return run. For this reason, the control unit 50 controls the actuators 40 of the throttle valve 22 and causes in particular a further opening of the throttle valve 22a and thus an increased supply of shrinkage medium 19 via the first supply line 30a to the nozzle surfaces 15, while the throttle valves 22b are closed and thus the supply of shrinking medium 19 via the second supply line 30b to the bottom-side spraying 16 of the conveyor chain 10 or lower side of the container is prevented. Thus, the conveyor chain 10 heats up only due to the prevailing in the shrink tunnel 2 StandBy temperature, but not due to additional supply of shrinkage medium 19. The conveyor chain 10 must therefore also less cooled so that the energy-intensive cooling step can be largely eliminated. In the interior of the shrink tunnel 2, a temperature sensor 42 is further arranged, which determines the internal temperature and transmitted to the control unit 50, whereupon either the temperature of the supplied shrinking medium 19 can be adjusted by regulating the heating power of the heater 20 or whereupon the amount of to the nozzle surfaces 15th supplied Schrumpfmedium19 can be adjusted via the actuator 40a of the throttle valve 22a. In particular, in standby mode and during production operation, a control over the temperature of the supplied shrinking medium 19 is preferably provided, while the rapid heating in wake-up operation is carried out by increasing the volume flow of shrinkage medium 19. In particular, it is provided that in the wake-up operation, at least the throttle valves 22a, which regulate the supply of shrinkage medium 19 to the nozzle surfaces 15, are maximally open.

Via the control unit 50, further programs of further operating states can be available and retrievable or adjustable. For example, the control unit 50 programs for different production operating conditions with different production target temperatures, different StandBy operating conditions with different target standby temperatures for longer or shorter breaks, different heating programs with shorter or longer heating, different cooling programs, etc. include. By means of the control unit 50 can be set, for example, that for heating the shrinking tunnel 2, all the throttle valves 22a, 22b are opened maximally to minimize by a high supply of shrinking medium 19, the heating time. The problem here could be that the conveyor chain 19 is heated too much and must therefore be counteracted by cooling the return conveyor chain 10 with a coolant 26 for this reason already when heating the shrinking tunnel 2. On the other hand, if the time factor is less relevant, it may be energetically more advantageous to open only the first throttle flap 22a for the supply of shrinking medium 19 to the nozzle surface 15 for maximum heating and not to open the second throttle flap 22b only partially. In addition to increasing the volume flow, an increase in the temperature of the supplied shrinkage medium 19 may be provided by regulating the heating power of the heating register 20 to further reduce the wake-up time. The control unit 50 can be equipped with defined programs or be individually programmable.

According to the present invention, the different operating conditions in the shrink tunnel 2 via an intelligent control of the as a splitting device serving throttle 22 achieved. After a break in production, the shrink tunnel 2 from a standby temperature o.ä. to heat to the required operating temperature, at least the first throttle 22a for the supply of shrinkage medium 19 to the lateral nozzle surfaces 15 are opened maximum to achieve the largest possible air change in the shrink tunnel 2 and to keep the heating times low. In the ongoing production operation, the position of the throttle valves 22a, 22b, however, adapted to the respective product, so that in each case a defined supply of shrinkage medium 19 through the nozzle surfaces 15 and a defined supply of shrinkage medium 19 from below on or through the conveyor chain 10 therethrough. This may mean, in particular, that the throttle valves 22a, 22b are heavily engaged in production mode or less heavily employed. The intelligent control according to the invention increases the availability of the shrinking tunnel 2, allows a quick resumption of production and increases the energy efficiency of the device 1 *. In particular, variable articles or article compositions can be edited, since an individual adaptation to the respective packaging material is possible. For example, in the case of a very thin packaging film, only a weak lateral volume flow of shrinking medium 19 of a specific temperature may be required in order to achieve an optimum packaging result. Through an interaction of the regulation of the heating power of the heating register 20 and the distribution of the shrinkage medium flow through the controlled adjustment of the throttle valves 22a, 22b, the shrinking device 1 * can be quickly and easily adapted to the respective product: In particular, a controlled adjustment of the throttle valves 22a, 22b a quick and easy changeover between the heating or wake-up operation and the production operation, whereby the wake-up time can be shortened enormously, since now no manual adjustment of the throttle valves 22a, 22b is necessary during a product changeover and before the shrinking device 1 * is heated up ,

The invention has been described with reference to a preferred embodiment. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

1/1 *

shrinker

2

shrink tunnel

3

entrance area

4

output range

5/5 *

container

6

bottles

7/7 *

shrink film

10

Conveyor chain / conveyor belt

14

Sidewall surface

15

die face

16

bottom-side spraying

18

fan

19

shrink medium

20

heater

22

throttle

23

temperature sensor

24

Coolant fan

26

coolant

30

feed

40

actuator

42

temperature sensor

50

control unit

T1 / T2

Temperature of the conveyor chain

TR

transport direction

Claims (15)

Shrinking device (1 *) with a conveying device (10) for articles or article assemblies (5), with at least one device (18) for producing shrinking medium and a device (20) for controlling the temperature of shrinking medium and with at least one dividing device for dividing the shrinkage medium Stream in at least two Schrumpfmedium- partial streams, wherein the first partial stream at least a first heating means (15) can be fed, via which the articles or article assemblies (5) from the side and / or from above with shrink medium (19) are applied and wherein the second partial stream at least a second heating means (16) can be fed and with which the conveyor device (10) is heated and / or with the underside of the articles or article assemblies (5) from below through the conveyor (10) with shrinking medium (19) acted upon is characterized in that the splitting device at least one device for the automated control of the distribution of the shrinkage medium flow in at least two shrinkage medium part streams (19) is assigned. Shrinking device (1 *) according to claim 1, wherein the at least one distribution device for dividing the shrinking medium (19) comprises at least two throttle valves (22), wherein a first throttle valve (40a) is connected to a first supply (30a), via the shrinking medium ( 19) is the first heating means (15) can be fed and wherein a second throttle valve (22b) with a second supply (30b) is connected, via the shrinking medium (19) the second heating means (16) can be fed. Shrinking device (1 *) according to claim 2, wherein the device for controlling the distribution device is a device for the controlled setting of predefined operating states, each having a controllable adjustment means per throttle valve (22a, 22b), in particular an actuator (40a, 40b), and a control unit (50). Shrinking device (1 *) according to one of the preceding claims, wherein at least the following two operating states can be set by the control unit (50): a. first operating state for a production operation with a defined first setpoint operating temperature in the interior of the shrinking device (1 *) and with a defined first supply of shrinking medium (19) via the at least one first heating means (15) and with a defined second supply of shrinking medium (19) via the at least one second heating means (15) and b. second operating state for a StandBy operation with a defined second setpoint standby temperature in the interior of the shrinking device (1 *), with no or only a reduced supply of shrinkage medium (19) via the at least one second heating means (16). Shrinking device (1 *) according to claim 4, wherein in the first production operating state, both the first throttle valve (22a) and the second throttle valve (22b) are at least partially open and wherein in the second StandBy operating state, the first throttle valve (22a) at least partially open is and the second throttle valve (22b) is at least largely closed. Shrinking device (1 *) according to one of the preceding claims, wherein the shrinking device (1 *) at least one temperature sensor (42, 23a, 23b), the means for controlling the distribution of the shrinkage medium flow and / or the means (20) for Tempering is associated with shrinking medium. Shrinking device (1 *) according to one of the preceding claims, wherein the conveyor device (10) is associated with at least one temperature sensor (23a, 23b). Method for setting different operating states of a shrinking device (1 *) with a conveying device (10), wherein in at least one first production operating state a defined first set operating temperature in the interior of the shrinking device (1) is adjusted by a defined first supply of shrinking medium ( 19) from above or laterally onto the articles or article assemblies (5) via at least one first heating means (15) and by a defined second supply of shrinking medium (19) via at least one second heating means (16) from below on or through the Conveying device (10) through the bottom of the article or article compositions (5) takes place and wherein in a second StandBy operating state, a defined second desired StandBy temperature in the interior of the Shrinking device (1 *) is set, wherein a defined first supply of shrinking medium (19) via at least a first heating means (15) and by no supply of shrinkage medium (19) via the at least one second heating means (16). The method of claim 8, wherein in a third wake-up operation, the shrinking device (1 *) is heated from a defined second desired StandBy temperature to a defined first setpoint operating temperature, wherein at least the first throttle valve (22a) is completely open such that a maximum first supply of shrinkage medium (19) takes place via a first heating means (15), in particular wherein the first and the second throttle flap (22a, 22b) are completely open, so that a maximum first and a maximum second supply of shrinkage medium (19) via a first heating means (15) and via a second heating means (16), whereby the wake-up time is minimized during heating. The method of claim 8 or 9, wherein the supply of shrinking medium (19) to the at least one first and / or second heating means (15, 16) via at least one splitting device for dividing the shrinking medium (19), wherein the splitting device means for controlling associated with the distribution device, via which a controlled setting of predefined operating states takes place. Method according to one of claims 8 to 10, wherein the regulation of the supply of shrinkage medium (19) via an adjustment of throttle valves (22a, 22b), which are regulated by a control unit (50) by the Eckdaten to the desired operating conditions in the Control unit (50) are programmed and wherein after selection of the desired operating state or after programming a certain time sequence following sequence of predefined operating conditions, the control unit (50) regulates the setting of the throttle valves (22a, 22b) via actuators (40a, 40b). Method according to one of claims 8 to 11, wherein at least one temperature sensor (23a, 23b) monitors the temperature of the conveying device (10), in particular wherein in the output region (4) of the shrinking device (1 *) a first temperature sensor (23a) is arranged the temperature of the conveyor device (10) in the output region (4) of the shrinking device (1 *) determined, the measured data transmitted to the control unit (50), the at least one Device (24a, 24b) for cooling the conveyor device (10) controls and / or wherein in the input region (3) of the shrinking device (1 *) a second temperature sensor (23b) is arranged, the temperature of the conveyor device (10) in the entrance area (3 ) of the shrinking device (1 *) determined, the measured data transmitted to the control unit (50) which controls at least one means (24a, 24b) for cooling the conveyor device (10). Method according to one of claims 8 to 12, wherein a temperature sensor (42) determines the actual temperature in the interior of the shrinking device (1 *), this value with a in the control unit (50) for the desired operating state stored desired temperature and at a deviation .DELTA.T between actual temperature and desired temperature, the temperature of the supplied shrinking means (19) by a regulation of the means (20) for controlling the temperature of shrinking medium adapts or at a deviation .DELTA.T between actual temperature and target temperature, the actuators (40a, 40b) and thereby regulates the adjustment of the throttle valves (22a, 22b). Method according to one of claims 8 to 13, wherein in the second standby operating state, the second throttle valves (22b) for the supply of shrinkage medium (19) to the second heating means (16) are kept closed and wherein a temperature sensor, the actual temperature in the interior of the Shrinking device (1) determined, this value is compared with the stored in the control unit target StandBy temperature and at a deviation .DELTA.T between actual temperature and StandBy temperature the actuator (40a) of the first throttle valve (22a) controls and the setting of the first Throttle valve (22a) and thus the supply of shrinking medium (19) to the at least one first heating means (15) regulated. Method according to one of claims 8 to 14, wherein via the control unit (50) a plurality of successive in a predefined time frame operating conditions can be adjusted and wherein the different operating conditions automatically adjusted by controlled regulation of the at least one distribution device for dividing the shrinking medium (19) become.

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