EP2799352A1 - Procédé de transfert d'un tunnel de rétraction en mode de production et procédé de transfert d'un tunnel de rétraction en mode arrêt depuis le mode production - Google Patents

Procédé de transfert d'un tunnel de rétraction en mode de production et procédé de transfert d'un tunnel de rétraction en mode arrêt depuis le mode production Download PDF

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Publication number
EP2799352A1
EP2799352A1 EP20140164846 EP14164846A EP2799352A1 EP 2799352 A1 EP2799352 A1 EP 2799352A1 EP 20140164846 EP20140164846 EP 20140164846 EP 14164846 A EP14164846 A EP 14164846A EP 2799352 A1 EP2799352 A1 EP 2799352A1
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EP
European Patent Office
Prior art keywords
shrink tunnel
shrink
opening
mode
exit area
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
Application number
EP20140164846
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German (de)
English (en)
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EP2799352B1 (fr
Inventor
Christian Napravnik
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.)
Krones AG
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Krones AG
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Publication of EP2799352A1 publication Critical patent/EP2799352A1/fr
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    • 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
    • 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
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • 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
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/02—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages
    • B65B57/04—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of binding or wrapping material, containers, or packages and operating to control, or to stop, the feed of such material, containers, or packages
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49716—Converting

Definitions

  • the present invention relates to methods of operating a shrink tunnel according to claims 1 and 9. More particularly, the invention relates to a method for transferring a shrink tunnel to a production mode and to a method for transferring a shrink tunnel from a production mode to a stand-by mode.
  • Such a shrink tunnel now consists essentially of a circulating endless conveyor, which is covered over a section with an enclosure (tunnel), which forms the tunnel.
  • a shrink tunnel usually consists of several heating elements and fans or blowers to produce the required hot air and then distribute in the tunnel interior.
  • the hot air is passed after their production by means of suitable hot air ducts partly in so-called shaft walls and partly in a chamber which is located directly below the conveying means of the shrinking tunnel.
  • the containers are preferably actively acted upon by hot air from at least three sides.
  • the basic structure of a shrink tunnel is explained here only in rough breaks. A person skilled in the packaging industry knows the structure of such Shrink tunnel enough, so that here at this point no further details must be called.
  • such a shrink tunnel for shrinking the film requires a hot gaseous medium, usually hot air.
  • This hot air is generated by the heating means, which are part of a shrink tunnel.
  • the hot air generated or the hot air generated by the heating means is preferably generated with electrical energy. Meanwhile, it has also gone over to produce the required hot air by means of, for example, a so-called gas burner. Unfortunately, the required gas is not readily available in many places, which is why electrically heated shrink tunnels are then used again.
  • Such electrically heated shrink tunnels have a high demand for electrical energy, resulting in not inconsiderable costs for the operator.
  • the generation of hot air turns out to be the largest energy consumers in a shrink tunnel dar.
  • the consumption of electrical energy can be reduced in a shrink tunnel, in which one of the shrink tunnel for the operating conditions or operating modes Production is required, this put into a so-called stand-by mode.
  • one or more consumers of the shrinking tunnel are reduced in their performance and thus reduced energy consumption compared to the production operation.
  • Such a shrink tunnel or such a method for operating a shrink tunnel for example, from the DE102010011640 A1 out.
  • a shrink tunnel is described, which in addition to the conventional production mode has a further so-called stand-by mode, by means of this stand-by mode of the shrink tunnel is operated with respect to the production mode reduced power.
  • the change between the conventional production mode and the further stand-by mode is time-controlled and / or signal-controlled.
  • some measures are taken which lead to a reduction in the energy requirement of the shrink tunnel.
  • One measure would be, for example, that the existing target temperature is adjustable to a relation to the target temperature reduced standby temperature, with the result that less heating power is required.
  • Another measure would be, for example, reducing the transport speed of the shrink tunnel side transporter in order to minimize the energy discharge, respectively the heat emission, from the tunnel.
  • the shutdown of cooling of the shrink tunnel side conveyor and the cooling of the drums which exit the shrink tunnel would be measures to reduce the energy requirement.
  • the so-called stand-by mode brings with it a further measure, wherein the two openings in the entrance and exit areas of the shrink tunnel are at least partially closed.
  • the shrink tunnel entrance area and the shrink tunnel exit area are logically opened so far in a conventional production mode that the packages can enter and exit unhindered into the shrink tunnel.
  • the shrink tunnel entrance area and the shrink tunnel exit area are either opened or closed during a change between the respective operating modes, ie between the production mode and the stand-by mode.
  • the change between the two operating modes is also triggered by time and / or signal.
  • Such a control for operating a shrink tunnel and such a shrink tunnel itself go for example from the DE 102010020957 A1 out.
  • the above-cited prior art thus already discloses a shrink tunnel or a method for controlling a shrink tunnel which changes over time and / or signal-controlled between two operating modes in which a different energy requirement is obtained in each case. Furthermore, the document discloses a shrink tunnel or a method for controlling a shrink tunnel, which additionally opens or closes the shrink tunnel openings in the entrance and exit areas of the shrink tunnel when switching between two modes of operation.
  • the object of the present invention is now to optimize the said prior art in that the energy demand of the shrink tunnel in a standstill mode, for example in stand-by mode, or when switching between the production mode and a standstill mode, for example Stand-by mode, further optimized and in particular minimized.
  • the object is achieved by a method for transferring a shrink tunnel into a production mode and by a method for transferring a shrink tunnel from a production mode into a standstill mode according to claims 1 and / or 9.
  • the invention shows a first method for transferring a shrink tunnel with a conveyor into a production mode, which comprises at least opening one of a shrink tunnel entrance area and / or opening a shrink tunnel exit area.
  • This method may in particular relate to a first commissioning of a shrink tunnel or the transfer of a shrink tunnel from a stand-by mode to a production mode.
  • a shrink tunnel in which due to a longer downtime all energy consumers have been turned off, and thus is in a so-called stop mode, be transferred to the production mode.
  • the essential difference between the stand-by mode and the stop mode is that the shrink tunnel in stand-by mode, as known in the art, is maintained at a lower second target temperature. By switching off all energy consumers in the stop mode, the interior of the shrink tunnel can cool down to the ambient temperature depending on the duration of the downtime. If the shrink tunnel is to be brought back into production mode, then the actual tunnel temperature is not known.
  • the method includes at least one of the steps of: a) increasing the shrink tunnel interior temperature to a predefined set point; b) switching on the conveyor or increasing the speed of the conveyor to a predetermined setpoint; c) increasing the chain cooling capacity for cooling the conveyor to a predetermined desired value; d) Increase the container cooling performance to a predetermined setpoint.
  • the opening of the shrink tunnel entrance area and / or the opening of the shrink tunnel exit area occurs at the earliest with one of the steps a), b), c) and / or d).
  • the setpoints are already the production values.
  • a shrink tunnel according to the invention for the inventive method consists of the components described at least below.
  • Such a shrink tunnel has an electric motor-driven conveying means and one or more aggregates also acting in combination (eg hot air blower in the form of fans, heating registers, sensors), which are responsible for the necessary generation of hot air and thus for adjusting the shrink tunnel interior temperature, respectively for achieving a predefined setpoint value. eg temperature in ° C, are necessary.
  • sensors may be provided in the interior of the shrink tunnel, which determine the actual temperature and pass the value to a control unit. The actual temperature is compared with the target temperature and the hot air blower and / or heater are then readjusted so that the target temperature is set in the interior of the shrink tunnel.
  • a shrink tunnel according to the invention used for the method according to the invention has a so-called electric chain cooling, which consists for example of one or more aggregates acting in combination such as fans and possibly sensors, which are arranged outside the tunnel interior, preferably below the revolving conveyor.
  • the cooling units are used to cool the conveyor, which is, for example, a mesh grid belt or a so-called Stabröllchenkette.
  • the conveyor heats up when passing through the shrink tunnel. Before it passes through the shrink tunnel again, it must be cooled down during the return, otherwise there is a risk that the packaging material and / or the subsequently promoted items at least partially melt and stick to the conveyor.
  • a shrink tunnel according to the invention used for the method according to the invention has at least one or more aggregates acting in combination, such as axial fans or cross-flow fans, which are usually arranged immediately after the shrink tunnel interior, ie outside and above and / or laterally of the conveyor, which are needed for the cooling of the containers and thus for the necessary cooling capacity. Furthermore, it is provided for the method according to the invention that in the region of the two tunnel openings of the shrink tunnel according to the invention doors or other suitable closure elements are arranged, which automatically close or open when needed, which reduces heat leakage from the shrink tunnel in a closed state of the doors or closure elements becomes.
  • the shrink tunnel further comprises a separate control by means of which the methods according to the invention can be carried out.
  • the data necessary for the inventive method are stored.
  • the for the Shrink tunnels required according to the invention are still equipped with at least one sensor (eg light barrier) on the inlet side of the tunnel and at least one further sensor (eg light barrier) on the outlet side of the tunnel.
  • the own control unit of the shrinking tunnel has an interface to a packaging machine or control unit of the packaging machine which precedes the shrinking tunnel and that these can mutually communicate with one another.
  • the communication interface for communicating the shrink tunnel with the upstream packaging machine can be done for example via a so-called Ethernet network.
  • each of the two operating modes thus has to first go through a few steps, which in turn are defined setpoints as default to reason. In order to achieve these target values, the initiation of specific measures or steps thus takes place with each change from one operating mode to another operating mode. It has been found that if the individual steps or measures are carried out in a defined sequence, the defined energy demand during execution of one or more steps can be reduced even further.
  • the inventive method for operating a shrink tunnel comprises at least opening a shrink tunnel entrance area and / or opening a shrink tunnel exit area.
  • This method is used when the shrink tunnel is initially in a stand-by mode, or when the shrink tunnel is previously completely off in a stop mode, as is the case for example during initial start-up.
  • the method according to the invention also comprises at least the step a) increasing the shrink tunnel interior temperature to a predefined setpoint value and / or the step b) switching on the conveyor or increasing the speed of the conveyor to a predetermined desired value and / or the step c) increasing the chain cooling capacity to one predetermined setpoint and / or step d) increase the container cooling power to a predetermined setpoint.
  • a further variant of the method according to the invention proposes that the opening of the shrink tunnel entrance area and / or the opening of the shrink tunnel exit area take place at the same time as or at the latest after one of the steps a) to d).
  • the opening of a shrink tunnel entrance area and / or the opening of a shrink tunnel exit area at the earliest takes place when the shrink tunnel interior temperature reaches the predetermined target value. It is thus prevented that during the heating process of the shrink tunnel interior, which by means of several electrical, energy consuming, individually or in combination acting aggregates, the shrink tunnel entrance area and / or the shrink tunnel exit area are opened prematurely.
  • the necessary for the heating unit units such as heater, fan heater, blower can thus be operated as efficiently as possible, since the shrink tunnel entrance area and / or the shrink tunnel exit area are in a closed state.
  • both shrinkage tunnel inlet and outlet areas are closed during the heating process, this also shortens the duration of the heating process; in particular, the duration of the step a) increases.
  • the shrinking tunnel interior temperature is increased to the predetermined desired value.
  • the provisioning time of a required state of the shrinking tunnel required for the production is shortened due to the shortened heating time.
  • the steps "opening the shrink tunnel entrance area and / or opening the shrink tunnel exit area” are made in response to the progress of step a) increasing the shrink tunnel interior temperature to a predefined set point.
  • the shrink tunnel entry area opening and / or shrink tunnel exit area opening may already occur when a predefined temperature is reached that is below the production mode set point. This avoids potential build-up of heat build-up within the shrink tunnel, which can cause the first packages transported through the shrink tunnel to overheat.
  • step a) Due to the opening of the shrink tunnel entrance area and / or the opening of the shrink tunnel exit area upon reaching a defined target temperature which corresponds, for example, to 90-95% of the predefined set value of the shrink tunnel interior temperature, a build-up of heat build-up within the shrink tunnel can be avoided, whereby the first After completion of step a) Increase the shrink tunnel interior temperature to a predefined set point, containers carried therethrough will not experience overheating or damage. This causes an improvement in the quality of the first processed in the shrink tunnel containers that would otherwise have to be discarded if necessary.
  • a further particular embodiment of the method according to the invention provides that step b), ie switching on the conveying means or increasing the speed of the conveying means, takes place as a function of the progress of the heating of the shrinking tunnel to a predefined setpoint temperature. For example, it may be provided to switch on the conveying means only when the temperature in the interior of the shrinking tunnel has reached approximately 90% of the nominal value.
  • the conveyor also requires a certain setpoint temperature for the production mode. If the conveyor is too cold, this will affect the quality of the shrinkage result in the bottom area of the containers negative. If the conveyor is switched off in the stand-by mode, then essentially only the transport area within the shrink tunnel heats up during heating of the shrink tunnel interior. The return area of the conveyor, however, remains cold depending on the arrangement.
  • the time at which the conveyor is turned on or at which the speed of the conveyor is increased is chosen so that when passing through the shrink tunnel during the time required to heat the shrink tunnel to the final setpoint of the required shrink tunnel interior, all Areas of the conveyor are heated sufficiently, so that this is heated all-encompassing to the required production temperature.
  • a further particular embodiment of the method according to the invention therefore provides that the increase in the chain cooling power takes place to a predefined desired value as a function of a determined chain temperature.
  • the conveying means eg net lattice band link chain, lamina chain
  • the conveying means are continuously cooled in a normal production mode to prevent it from overheating. Too much heated conveyor would result in melting of packaging material and possibly also partial melting of the articles. This leads to contamination of the conveyor with plastic residues and hinders further transport. In addition, this can lead to severe loss of quality in the shrunk-ready container.
  • the method according to the invention provides that, in addition to the opening of the shrink tunnel entrance area and / or opening of the shrink tunnel exit area, the earliest with one of the steps a), b) c) or d), during the step c), ie during the increase of the cooling capacity for cooling the conveying means, an increase of the chain cooling power takes place as a function of a determined conveying means temperature.
  • an increase of the chain cooling power takes place as a function of a determined conveying means temperature.
  • This setpoint corresponds to a temperature value that the conveyor should have in the shrink tunnel input area.
  • an adapted cooling of the conveyor takes place. The success of cooling can be achieved by a second, in Return range arranged temperature sensor can be checked and, if necessary, then the chain cooling performance can be adjusted again.
  • the shrink tunnel doors or closure elements are opened not only as a function of the shrink tunnel interior temperature, but also as a function of the containers, which are produced by the upstream packaging machine and transported through the conveyor through the shrink tunnel. It can therefore also here a loss of energy due to a premature opening of the shrink tunnel doors or closure elements can be avoided.
  • the time can be used, which requires the packaging machine to wrap a first container with foil, which is passed after the shrink tunnel. This time is not insignificant.
  • the shrink tunnel entrance area is opened only when the packaging machine has already begun with the production of the film pack and its wrapping.
  • the shrink tunnel entrance area opens only with the completion of a first wrapped with shrink wrap.
  • the shrink tunnel exit area can either be opened under the same conditions, or until a certain time has elapsed, if before, depending on the speed of the conveyor.
  • the shrink tunnel entrance area and the shrink tunnel exit area each have their own sensors.
  • An embodiment of the sensor system provides a first light barrier at least in front of the shrink tunnel entrance area. Depending on the occupancy and a predetermined time interval, this light barrier arrangement controls the Opening time of the two shrink tunnel doors, wherein the shrink tunnel entrance area is opened first and the shrink tunnel exit area only after expiry of a subsequent, predetermined time interval.
  • the shrink tunnel exit area may also be opened simultaneously with the opening of the shrink tunnel entrance area.
  • This type of opening control of the two shrink tunnel doors or closure elements appears to be particularly preferred and at the same time as the simplest and most direct way to open the shrink tunnel doors or closure elements as closely as possible, if necessary, ie in particular when the container in the Shrink tunnels run in or are located just before the shrink tunnel entrance area or if the drums in the shrink tunnel are located shortly before the shrink tunnel exit area.
  • this way of controlling the shrink tunnel doors via a light barrier arrangement can also be used to close the shrink tunnel entrance area and the shrink tunnel exit area as directly and quickly as possible.
  • a light barrier is arranged in front of the shrink tunnel entrance area and immediately after the shrink tunnel exit area.
  • the conveyor before or when transferring the first container on the conveyor are operated for a short time with an increased transport speed.
  • This additional process step contributes only indirectly to the optimization of the energy requirement or energy consumption.
  • the transport speed of the conveyor may need to be temporarily above the normal transport speed required for normal production operation. It thus acts in relation, due to the short-term increase in the transport speed, the same heat energy on the first continuous container, as in the trailing other containers, which are among the normal Production conditions are transported at normal transport speed through the shrink tunnel.
  • the first container which are transported through the shrink tunnel with increased transport speed and which are the following containers that are driven through the shrink tunnel under the normal production conditions, it should be noted at this point that the first container a number of at least five containers, but not more than 25 containers. If you were to transport even more containers with an increased transport speed through the shrink tunnel, so would be due to the lack of heat storage optimal shrinkage result is no longer guaranteed.
  • the short-term increase in the transport speed can be defined in terms of time with about one to three minutes.
  • the shrink tunnel can be in a stop mode in which all energy consumers are completely switched off.
  • the shrink tunnel is in a stand-by mode, in which the performance of the energy consumers is at least partially reduced.
  • a part of the energy consumers, for example a part of the heating means can also be completely switched off.
  • the shrink tunnel from standby mode can be relatively quickly put back into production mode.
  • the stop mode on the other hand, all energy consumers are switched off so that the shrink tunnel can even cool to room temperature depending on the duration of the downtime.
  • the stop mode of the shrink tunnel is initiated by the control unit being put into a stop mode after all process steps a) to e) have been carried out, whereby a shutdown of all energy consumers is effected.
  • step f) the control unit and thus the shrink tunnel are first woken up from the stop mode and transferred into a so-called run mode in which, for example, all Heating means of the shrink tunnel are operated at maximum power. If then a shrink tunnel interior temperature is reached, which corresponds approximately to the target internal temperature in the stand-by mode or about 85-90% of the target internal temperature in stand-by mode, the power of the heating medium is reduced again and the steps for transferring the Shrink tunnels from stand-by mode into production mode are initiated.
  • the invention further relates to a method for transferring a shrink tunnel into a production mode, wherein the method at least opening a shrink tunnel entrance area and / or opening a Shrink tunnel exit area includes. It is provided that the shrink tunnel entrance area and / or the shrink tunnel exit area of the shrink tunnel are initially closed. First, the shrink tunnel is put in an operating mode. This is done by switching on or boosting the power of at least one consumer within the shrink tunnel. The opening of the shrink tunnel entrance area and / or the opening of the shrink tunnel exit area occurs at the earliest with the switching on or increasing the power of the at least one consumer within the shrink tunnel.
  • the opening of the shrink tunnel entrance area and / or the opening of the shrink tunnel exit area only takes place when a minimum temperature in the interior of the shrink tunnel has been reached. This is controlled and controlled, for example, via a temperature sensor coupled to a control unit. Subsequently, the performance of other consumers is increased to the production output, which sets the production mode of the shrink tunnel.
  • the invention further relates to a method for transferring a shrink tunnel from a production mode to a standstill mode.
  • Standstill mode can be understood as a standby mode in which the shrink tunnel is operated at a reduced power.
  • Standstill mode can also be understood as a stop mode in which all energy consumers of the shrinking tunnel are completely switched off.
  • the method includes at least closing a shrink tunnel entrance area and / or closing a shrink tunnel exit area. Furthermore, the method comprises at least one of the following steps: aa) lowering the shrink tunnel interior temperature to a predefined setpoint value; bb) reducing the speed of the conveyor to a predetermined setpoint; cc) reducing the chain cooling capacity to a predetermined target value; dd) Reduce the unit cooling capacity to a specified setpoint.
  • the closing of the shrink tunnel entrance area and / or the closing of the shrink tunnel exit area takes place at the latest with one of the steps aa), bb), cc) or dd).
  • the closing of the shrink tunnel entrance area and / or the closing of the shrink tunnel exit area occurs at the earliest before one of the steps aa), bb), cc) or dd).
  • the closing of the shrink tunnel entrance area and / or the closing of the shrink tunnel exit area takes place as a first step before a the steps aa), bb), cc) or dd) is performed.
  • the steps aa), bb), cc) or dd) can be carried out in any order or at the same time.
  • reducing the speed of the conveyor takes place at the latest with the lowering of the shrink tunnel interior temperature. Due to the constant movement of the conveying means, when the shrinking tunnel is being heated, it is always ensured that heat is not continuously supplied to the conveying means. In particular in the return area there is no supply of heat, so that the conveying means can always cool down in regions.
  • the transport speed of the conveyor already lowered before lowering the temperature in the interior of the shrink tunnel or the funding be stopped completely, it could be locally in the interior of the shrink tunnel to a strong overheating of the funding, which also causes damage to the funding or other components within could cause the shrinking tunnel.
  • the conveyor must be cooled for this reason in normal production usually also in order to avoid overheating of the conveyor and consequent damage to the containers to be processed.
  • reducing the chain cooling performance takes place at the latest with the reduction of the speed of the conveyor.
  • the method may further comprise an additional step ee) with which the position of the containers carried on the conveyor is determined and the closure of the shrink tunnel entrance area and / or the shrink tunnel exit area is effected as a function of the determined position.
  • the shrink tunnel is no longer supplied with packages to be processed.
  • no containers should remain in the shrink tunnel during standstill mode.
  • the shrink tunnel entrance area could already be closed after the last container is retracted into the shrink tunnel, while the shrink tunnel exit area can not be closed until the last container has left the shrink tunnel.
  • both areas are preferably closed at the same time, after all containers have left the shrink tunnel.
  • the setpoint values of method steps aa), bb), cc) and / or dd) are equal to zero.
  • it is provided in a so-called stop mode that all energy consumers of the shrinking tunnel are switched off. In this case, there is no monitoring of the shrink tunnel interior temperature, so that it can cool down in extreme cases to a temperature which corresponds approximately to the prevailing ambient temperature.
  • a further step ff) can be provided which sets the control unit of the shrinking tunnel in a stop mode.
  • the execution of all steps aa) to ee) in particular indicates a longer downtime and thus serves as a signal for the control unit to completely switch off all energy consumers.
  • the invention further relates to a method for transferring a shrink tunnel from a production mode to a standstill mode, wherein the method comprises at least closing a shrink tunnel entrance area and / or closing a shrink tunnel exit area.
  • the shrink tunnel entrance area and the shrink tunnel exit area are at least partially opened to allow passage of the articles or article assemblies through the shrink tunnel entry area into the shrink tunnel and through the shrink tunnel exit area out of the shrink tunnel.
  • the shrink tunnel is first put into an operating mode by turning off or reducing the power of at least one consumer within the shrink tunnel.
  • the closing of the shrink tunnel entrance area and / or the closing of the shrink tunnel exit area occurs at the earliest with the switching off or lowering of the power of the at least one consumer within the shrink tunnel.
  • the shrink tunnel can be set by switching off or reducing the power of other consumers in a standstill mode, in particular in the stand-by mode or even in the stop mode. If the shrink tunnel for a new production now be put back into production mode, this is done for example via the intermediate step of the operating mode. Depending on the given actual temperature in the interior of the shrink tunnel in Standstill mode may require less energy to reach the operating mode and then the production mode.
  • FIG. 1 shows a schematic overview of a method for transferring a shrink tunnel in different operating modes.
  • the shrink tunnel largely has a defined internal temperature Ti-PM, which is necessary for normal shrinking operation. This is below the melting temperature of the packaging material and the article.
  • the internal temperature Ti-PM in production mode PM is about 200 ° C.
  • the conveying means, with which the packaging-enveloped articles or article compositions are conveyed through the shrinking tunnel moves at a predefined production speed V (F) -PM.
  • the conveyor is a continuously moving endless conveyor. This heats up when passing through the shrink tunnel and is at least partially cooled down again during the return between the shrink tunnel entrance area and the shrink tunnel exit area via first blower or other first coolant supplier.
  • the first coolant suppliers operate with a cooling capacity P (F) -PM. Furthermore, the containers are after leaving the shrinking tunnel cooled down by means of second blower or other second coolant supplier before they are supplied to other processing devices. In production mode PM, the second coolant suppliers operate with a cooling capacity P (G) -PM.
  • the shrink tunnel entrance area and the shrink tunnel exit area are closed at the latest with one of the steps aa), bb), cc) or dd) via doors or other suitable closure elements.
  • the position of the transported on the conveyor container is determined. Closing of the shrink tunnel entrance area and / or the shrink tunnel exit area takes place in dependence on the determined position of the containers.
  • the shrink tunnel entrance area is closed only when there are no containers in an inlet area to the shrink tunnel.
  • the shrink tunnel exit area is not closed until there are no more containers inside the shrink tunnel.
  • the control unit can be put into a stop mode in a method step ff), in particular for longer standstill times.
  • a complete shutdown of all energy consumers of the shrink tunnel is initiated and the shrink tunnel is placed in a stop mode S.
  • stop mode S the desired value of method steps aa) to dd) corresponds in each case to a value equal to zero.
  • the heating means are switched off, so that the interior of the shrink tunnel cools out in an uncontrolled manner and, depending on the duration of the downtime, largely adapts to the ambient temperature RT. Furthermore, the funding per se and the chain coolant and the container coolant are completely switched off.
  • the doors or closure elements in the shrink tunnel entrance area and in the shrink tunnel exit area are opened at the latest with one of the steps a), b), c) or d).
  • the control unit is switched from the stop mode to an activation mode.
  • the energy consumers of the shrink tunnel are at least partially turned on, so that the shrink tunnel in the stand-by mode with a defined shrink tunnel interior temperature Ti-SB, a reduced speed V (F) -SB of the conveyor, a reduced chain cooling power P (F) -SB and / or a reduced one Container cooling power P (G) -SB is added.
  • the final adaptation of the tunnel power to the production mode PM and the opening of the entrance and / or exit area of the shrink tunnel takes place.
  • control unit can be switched from the stop mode to a run mode.
  • This is used to produce the production mode PM of the shrink tunnel within a very short time by operating at least a part of the energy consumers for a short time with increased power.
  • it can be provided to operate the heating means for a short time with maximum power.
  • the temperature in the interior of the shrink tunnel is monitored by sensors. If the shrink tunnel inner temperature exceeds a defined value, which is set between 85-95% of the shrink tunnel inner temperature Ti-PM in the production mode PM, then the power of the heating means is switched to normal production capacity.
  • the run mode according to method step f) on the one hand causes rapid heating of the interior space, on the other hand avoiding overheating of the interior of the shrink tunnel due to the timely downregulation.
  • the input and output area are opened only when the necessary shrink tunnel interior temperature is set. Furthermore, it can be provided that the entrance area is opened only when containers to be processed are located in the inlet area to the shrink tunnel. Furthermore, the exit area can only be opened when the first containers are already in the shrink tunnel.
  • the conveying means can be operated for a short time with an increased transport speed before or upon transfer of the first container to the conveyor. This prevents the quality of the shrink wrap from suffering from heat buildup in the shrink tunnel.
  • the same heat energy acts on the first continuous drums as on the succeeding drums which are conveyed through the shrink tunnel under normal production conditions at normal transport speed. This is especially necessary if the heating of the shrink tunnel is not monitored by sensors.
  • FIG. 3 shows a schematic overview of an embodiment of a method for transferring a shrink tunnel between a production mode PM and a standstill mode, in particular a stand-by mode SB or a stop mode S, via an intermediate mode of operation BM.
  • the shrink tunnel entrance area and the shrink tunnel exit area are at least partially opened to allow passage of the articles or article assemblies.
  • the shrink tunnel is first put into an operating mode BM by turning off or reducing the power of a consumer within the shrink tunnel.
  • the closing of the shrink tunnel entrance area and / or the closing of the shrink tunnel exit area in the illustrated embodiment takes place simultaneously with the switching off or lowering of the power of the one consumer within the shrink tunnel, whereby the existing heat inside the shrink tunnel is largely retained.
  • the shrink tunnel may be shut down or reduced by the power of other consumers according to any of the related art FIGS.
  • the shrink tunnel for a new production is to be put back into the production mode PM from standstill mode SB or S, this is also done via the intermediate step of the operating mode BM.
  • less energy may have to be applied in order to reach the operating mode BM and then the production mode PM.
  • the shrink tunnel entrance area and the shrink tunnel exit area of the shrink tunnel are shut off in SB or S standstill mode.
  • the power of a consumer within the shrink tunnel is increased by powering up or boosting. Opening the shrink tunnel entry area and opening the shrink tunnel entrance area Shrink tunnel exit area occurs at the earliest with switching on or increasing the power of the consumer within the shrink tunnel.
  • the opening of the shrink tunnel entrance area and the opening of the shrink tunnel exit area are performed only after the operation mode BM has been reached.
  • the operating mode is reached if, for example, there is a predefined temperature in the interior of the shrink tunnel.
  • the opening of the shrink tunnel entrance area and the opening of the shrink tunnel exit area take place, in particular, first with one of those associated with the FIGS. 1 and 2 described process steps a) and / or b) and / or c) and / or d) and / or e) and / or f).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP14164846.9A 2013-04-30 2014-04-16 Procédé de transfert d'un tunnel de rétraction en mode de production et procédé de transfert d'un tunnel de rétraction en mode arrêt depuis le mode production Active EP2799352B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013104417.4A DE102013104417A1 (de) 2013-04-30 2013-04-30 Verfahren zum Überführen eines Schrumpftunnels in einen Produktionsmodus und Verfahren zum Überführen eines Schrumpftunnels von einem Produktionsmodus in einen Stillstand- Modus

Publications (2)

Publication Number Publication Date
EP2799352A1 true EP2799352A1 (fr) 2014-11-05
EP2799352B1 EP2799352B1 (fr) 2016-09-07

Family

ID=50513713

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EP14164846.9A Active EP2799352B1 (fr) 2013-04-30 2014-04-16 Procédé de transfert d'un tunnel de rétraction en mode de production et procédé de transfert d'un tunnel de rétraction en mode arrêt depuis le mode production

Country Status (4)

Country Link
US (1) US20150000093A1 (fr)
EP (1) EP2799352B1 (fr)
CN (1) CN104129535B (fr)
DE (1) DE102013104417A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
FR3070376A1 (fr) * 2017-08-30 2019-03-01 C.E.R.M.E.X. Constructions Etudes Et Recherches De Materiels Pour L'emballage D'expedition Fonctionnement d'un dispositif de retraction d'une fardeleuse automatique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021103837A1 (de) 2021-02-18 2022-08-18 Krones Aktiengesellschaft Schrumpfvorrichtung und Verfahren zum Optimieren des Energieaustrags einer Schrumpfvorrichtung
DE102021108138A1 (de) 2021-03-31 2022-10-06 Krones Aktiengesellschaft Verfahren zum Überführen einer Schrumpfvorrichtung in einen StandBy-Modus und Schrumpfvorrichtung

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US3807126A (en) * 1970-06-10 1974-04-30 Schwartz F Gmbh Ind Und Maschi Wrapping and securing loads on pallets
US3826017A (en) * 1972-07-27 1974-07-30 R Kostur Heating system
US4616123A (en) * 1984-11-13 1986-10-07 Zagoroff Dimiter S Shrink oven
EP0309132A2 (fr) * 1987-09-21 1989-03-29 W.R. Grace & Co.-Conn. Procédé et appareil d'emballage
US20040083687A1 (en) * 2002-11-01 2004-05-06 Christman Russell T. Shrink tunnel control apparatus and method
DE102010011640A1 (de) 2010-03-16 2011-11-17 Khs Gmbh Schrumpftunnel zum Aufbringen von Schrumpffolien, Verfahren zum Betrieb oder Steuern eines Schrumpftunnels sowie Produktionsanlage mit einem Schrumpftunnel
DE102010020957A1 (de) 2010-05-19 2011-11-24 Khs Gmbh Schrumpftunnel zum Aufbringen von Schrumpffolien, Verfahren zum Betrieb oder Steuern eines Schrumpftunnels sowie Produktionsanlage mit einem Schrumpftunnel

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US3399506A (en) * 1965-04-01 1968-09-03 Grace W R & Co Process and apparatus for simultaneously heat sealing and heat shrinking film
US4493159A (en) * 1983-06-08 1985-01-15 Crown Zellerbach Corporation Shrink tunnel with movable gate
US4538363A (en) * 1984-02-01 1985-09-03 Zagoroff Dimiter S Shrink oven
CA2436202A1 (fr) * 2000-11-01 2002-05-10 Kysters Kayat, Inc. Tunnel de retraction pour machine d'emballage adaptable
GB2448501A (en) * 2007-04-17 2008-10-22 Redford Design Ltd Aperture cover assembly for a tunnel oven
DE102013104666A1 (de) * 2013-05-07 2014-11-13 Krones Ag Vorrichtung und Verfahren zum Herstellen von Behältniszusammenstellungen

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Publication number Priority date Publication date Assignee Title
US3807126A (en) * 1970-06-10 1974-04-30 Schwartz F Gmbh Ind Und Maschi Wrapping and securing loads on pallets
US3826017A (en) * 1972-07-27 1974-07-30 R Kostur Heating system
US4616123A (en) * 1984-11-13 1986-10-07 Zagoroff Dimiter S Shrink oven
EP0309132A2 (fr) * 1987-09-21 1989-03-29 W.R. Grace & Co.-Conn. Procédé et appareil d'emballage
US20040083687A1 (en) * 2002-11-01 2004-05-06 Christman Russell T. Shrink tunnel control apparatus and method
DE102010011640A1 (de) 2010-03-16 2011-11-17 Khs Gmbh Schrumpftunnel zum Aufbringen von Schrumpffolien, Verfahren zum Betrieb oder Steuern eines Schrumpftunnels sowie Produktionsanlage mit einem Schrumpftunnel
DE102010020957A1 (de) 2010-05-19 2011-11-24 Khs Gmbh Schrumpftunnel zum Aufbringen von Schrumpffolien, Verfahren zum Betrieb oder Steuern eines Schrumpftunnels sowie Produktionsanlage mit einem Schrumpftunnel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3070376A1 (fr) * 2017-08-30 2019-03-01 C.E.R.M.E.X. Constructions Etudes Et Recherches De Materiels Pour L'emballage D'expedition Fonctionnement d'un dispositif de retraction d'une fardeleuse automatique
EP3450334A1 (fr) * 2017-08-30 2019-03-06 C.E.R.M.E.X. Constructions Etudes Et Recherches De Materiels Pour L'emballage D'expedition Fonctionnement d'un dispositif de rétraction d'une fardeleuse automatique
US11235918B2 (en) 2017-08-30 2022-02-01 Sidel Packing Solutions Operation of a retraction device of an automatic bundler

Also Published As

Publication number Publication date
CN104129535B (zh) 2016-08-24
DE102013104417A1 (de) 2014-10-30
US20150000093A1 (en) 2015-01-01
EP2799352B1 (fr) 2016-09-07
CN104129535A (zh) 2014-11-05

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