EP3609792A1 - Verfahren zur regelung der heizleistung von schrumpfvorrichtungen und entsprechende vorrichtung - Google Patents
Verfahren zur regelung der heizleistung von schrumpfvorrichtungen und entsprechende vorrichtungInfo
- Publication number
- EP3609792A1 EP3609792A1 EP18717574.0A EP18717574A EP3609792A1 EP 3609792 A1 EP3609792 A1 EP 3609792A1 EP 18717574 A EP18717574 A EP 18717574A EP 3609792 A1 EP3609792 A1 EP 3609792A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heaters
- heating zone
- heating
- operating mode
- temperature
- 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
Links
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
-
- 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
- B65B57/10—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of articles or materials to be packaged
- B65B57/16—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of articles or materials to be packaged and operating to stop, or to control the speed of, the machine as a whole
Definitions
- the invention relates to a method and a device for
- Packing agent groups are each covered with a shrink film.
- one of the packaging machine subsequent shrinking device is from each
- Packaging unit or a container formed. The heat within the
- Shrinking device can be produced for example by electric heaters.
- the shrinking device can, for example, several in
- Transport direction of the individual packages comprise successive heating zones.
- shrinking devices with electric heaters which have a relatively low basic heating load, for example a base heating load of 12-15kW per heating zone.
- a heating device is provided per heating zone, which is preferably switched on and off together with the main switch of the shrinking tunnel.
- this is the Grundfindlast providing heater permanently activated.
- the document DE 10 2010 020 957 A1 discloses a shrink tunnel for
- Heating means can between a Grundloomlast and a maximum
- Heating power to be controlled discloses a furnace for curing paints or coatings.
- the oven has one or more temperature sensors to measure the temperature of the object to be cured.
- the temperature control to the target temperature of the shrink tunnel is carried out by the other heating devices of the respective heating zones, for example, have a power of up to 60kW per heating zone.
- These further heating devices can be switched on and off via switching units.
- the other heaters are each operated together, so also switched on or off together.
- the desired setpoint temperature of the shrinking tunnel is reached very quickly after switching on the heating devices, which results in the first one being switched on
- Heating devices must be switched off again after a short time, not to the target temperature of the shrink tunnel in an inadmissible manner
- the further heaters have high power, which causes the other heaters to be switched at a high switching frequency.
- Switching currents often mains disturbances, in particular voltage fluctuations, which in turn cause so-called flicker effects, ie brightness fluctuations in light sources.
- a shrinking device is the subject of
- the invention relates to a method for operating a device for shrinking a flat material onto a group of individual packagings with at least one heating zone with a plurality of electrical heating devices, the method comprising the following
- Process steps include:
- the main advantage of the method according to the invention is that in the first operating mode, in which the system is operated with the GrundMaplast, the heating power (basic heating) is not rigidly predetermined, but the active in the first operating mode number of heaters and thus the amount of Base heating power is determined based on operating parameters, so that by a suitable choice of GrundMapante a reduced frequency of switching on and off of the heaters and thus reduced
- the number of active heaters in the first operating mode is dependent on the target temperature in the heating zone.
- the setpoint temperature within the respective heating zone significantly determines the number of active heaters in the first operating mode
- Operating parameters that can influence the number of active heaters in the first operating mode are, for example, the
- the number of active heaters in the first operating mode is equal to or greater than two.
- a single heater is used to generate the basic heating power but at least two.
- a base heat load of more than 15KW is provided by the at least two active heaters.
- the number of active heaters in the second mode of operation is one greater than the number of active heaters in the first mode of operation.
- Base heaters providing heating intermittently only one additional heater connected to increase the temperature in the heating zone to the target temperature. This allows the through the switching operations caused power changes and thus the voltage fluctuations in the electrical network can be significantly reduced.
- the number of active heating devices in the first operating mode is calculated by a control device taking into account at least one operating parameter. This allows the basic heating power to be adjusted automatically. Alternatively, it is possible that the
- Basic heat output is set manually by the operator depending on operating parameters.
- the number of heaters active in the first mode of operation becomes basic during operation of the device
- the number of heaters active in the first operating mode is taken into account in consideration of the activation and / or deactivation of the respective heaters
- Temperature changes in each heating zone determined. For example, the time course of the temperature change after activating or
- Disabling a certain heater can be determined and deduced from whether this heater should be activated to provide the basic heating or not.
- the heating devices assigned to the respective heating zone can each have the same heating power or different heating power.
- the heating device for providing the basic heating power which covers the power requirement as precisely as possible, which at a certain level
- Operating situation eg set temperature, ambient temperature, etc.
- the number of heating devices active in the first operating mode is reduced by one if, in the second operating mode, the measured actual temperature in the region of the heating zone exceeds the setpoint temperature by a predetermined temperature difference value for a predetermined period of time
- the temperature difference value is in the range between 1 ° C and 5 ° C, in particular at 2 ° C, 3 ° C or 4 ° C.
- the predetermined period of time is in the range between 30 sec and 3 min and in particular 1 min, 1, 5 min or 2 min or more.
- the number of heaters active in the first operating mode is reduced by one if the ratio of the time duration in which the device is in the second operating mode to the time duration in which the device is in the first operating mode is below a threshold value.
- the time duration ratio is determined, which indicates how long the heating zone is operated with basic heating power.
- the basic heating power is reduced when the time duration ratio indicates that the heating zone is only ever very short with a heating power above the
- the ratio of the durations over a plurality of switching cycles is determined. This can be an average of
- Time duration ratio are calculated. Based on the time duration ratio, a decision can then be made to reduce the base heating power.
- the activation and deactivation of the heating devices is effected by switching means, wherein the switching means preferably also the, monitor electrical load connected through it.
- the switching means preferably also the, monitor electrical load connected through it.
- the activation and deactivation of the heating devices is carried out by at least one switching device, which is designed to switch the heating devices according to the principle of oscillation packet control.
- the switching device is designed to activate or deactivate the heaters in zero crossings of the current or voltage profile. This largely avoids current and voltage transients and therefore harmonics.
- the heating of the heating zone by activating, in particular time-delayed activation of all heaters.
- the load change can be distributed over time and thus the impact on the electrical network can be reduced.
- the invention relates to a device for shrinking a sheet material onto a group of individual packages.
- the device comprises at least one multiple electric heaters having
- Heating zone and a temperature sensor for determining the actual temperature in the region of the heating zone wherein a control device is provided which is for receiving information regarding the actual temperature in the region of the heating zone and for causing a switching of the device from a first operating mode to a second operating mode is trained.
- switching means are provided which cooperate with the control device such that in a first
- Operating mode is changed by the number of active heaters is reduced to a predefined number of heaters when the actual temperature has exceeded a target temperature in the heating zone, the predefined number of heaters was determined taking into account at least one operating parameter.
- the switching means cooperate with the control device such that from the first operating mode into a second mode of operation is switched by the number of active heaters for controlling the actual temperature in the region of the heating zone is raised to the target temperature.
- FIG. 1 shows by way of example and roughly schematically an embodiment of a
- FIG. 2 shows by way of example and roughly schematically an illustration of two heating zones with heating devices and associated switching means; by way of example and roughly schematically, a temperature diagram illustrating the interaction of the heaters to achieve a certain temperature in the heating zone; 4 shows by way of example and schematically the temporal current or voltage curve in an AC network, based on the switching of the
- Heating devices according to the vibration packet control can be done; and Fig. 5 by way of example and schematically two time courses of the
- the reference numeral 1 shows a device for shrinking a flat material onto a group of individual packagings. Such devices 1 are also referred to as shrinking device.
- the device 1 comprises a conveyor 5, on which grouped individual packaging,
- bottles, cans or other packaging wrapped as packaging groups with a sheet material to a shrink tunnel 6 are supplied.
- the sheet material may in particular be made of a plastic material film which contracts under the action of heat and thus the
- the shrink tunnel 6 has in the embodiment shown a plurality of heating zones I, II, in each of which a plurality of electrical heaters HR are provided for generating the necessary for the shrinkage of the sheet material heat.
- the electrical heaters HR may be any heaters operated by electric current, in particular resistance heaters having at least one heating coil.
- each heating zone I, II has at least one temperature sensor, by means of which the actual temperature in the region of this heating zone I, II is detected. Based on the information obtained by this temperature sensor, it is possible to control and / or regulate the actual temperature within the heating zone I, II in such a way that it is regulated in the region of a setpoint temperature ST.
- This desired temperature ST depends, in particular, on the material surrounding the packaging material group, the conveying speed of the conveyor 5 or the residence time of a packaging material group in the respective heating zone I, II, etc. This may, for example, in the range between 150 ° C and 250 ° C, in particular between 170 ° C and 200 ° C.
- the desired temperature ST can be selected to be different for the different heating zones I, II.
- the device 1 furthermore has a control device 3.
- the control device 3 is designed in particular for controlling the temperature within the respective heating zone I, II. This control can be done in particular by turning on or off the heaters HR of each heating zone I, II.
- the control device 3 is preferably connected to the temperature sensor provided in the heating zone I, II and receives from this information regarding the actual temperature within the heating zone I, II.
- the control device 3 is adapted to the actual temperature within the heating zone I, II with a
- Control device so that the terms control and regulation in the context of the present application are always to be interpreted in accordance with the respective relevant parts of the description.
- Heater HR is performed by switching means 4.
- each heater HR associated with a separate switching means 4, so that each heater HR can be activated or deactivated independently of the other heaters.
- the switching means 4 can be formed in particular by a semiconductor contactor.
- the control of the device 1 will be explained in more detail based on the illustration in FIG.
- the interior of the shrinking tunnel 6 is first heated by the heaters HR.
- first all heaters HR are activated, so that the heating zone I, II is heated with maximum heating power.
- the actual temperature within the respective heating zone I, II is detected by the temperature sensor and the heating zones I, II are operated with maximum heating power until the actual temperature has reached or exceeded the setpoint temperature ST.
- the number of active, ie the switched-on heating HR is reduced, so that the respective heating zone I, II is heated with a Grundloomlast by a Number of active heaters HR is defined in the respective heating zone I, II.
- the number of active heaters HR per heating zone I, II in the Grundloomlast is preferably at least two heaters HR per heating zone I, II.
- Setpoint temperature ST is carried out by the control device 3, which outputs control signals to the switching means 4, thereby activating or deactivating the
- Heaters reach HR.
- the heaters HR are preferably always operated with a fixed electrical power whose amount is not changeable.
- the heaters HR are therefore only switched digitally (on / off). To reduce the frequency of switching operations and thus the
- the necessary for the Grundmorelast number of active heaters HR depending on operating parameters of the device 1 is determined in advance. The determination of the number of active
- Heating means HR for achieving the GrundMaplast can be done for example based on experience of the operator and manually or by appropriate inputs to the machine control can be set.
- the control device 3 or a control computer connected to it it is possible for the control device 3 or a control computer connected to it to have the necessary active power to achieve the basic heating load
- Heating devices HR calculated and this calculated value is used for operation of the device 1 at Grundloomlast.
- operating parameters such as e.g. the target temperature ST, the
- the number of active heaters HR for achieving or continuously providing the base heat load is preferably chosen such that the heating power achieved by these heaters HR is less than the heating power necessary for attaining the setpoint temperature ST. This will achieve that after the above-described heating process, after reaching or exceeding the target temperature ST by operating the device 1 in the Grundfindlast by deactivating at least one heater HR compared to the heating process, a decrease in the actual temperature in the heating zone I, II. In other words, after the heating process of the respective heating zone I, II, this heating zone I, II is initially operated with the basic heating load.
- the number of active heaters is increased, preferably by a single heater HR (for each heating zone I, II), so that the now provided heating power in the heating zone I, II is greater than the heat loss, so that the actual temperature in the heating zone I, II increases again.
- a heater HR for each heating zone I, II
- a heating zone I, II has four heating devices HR1, HR2, HR3, HR4, which can be activated independently of one another.
- the heaters HR1, HR2, HR3, HR4 cause by their joint activation a temperature in the heating zone I, II according to the temperature diagram in Fig. 3rd
- the heating of the heating zone would first by activation of all four
- Heating devices HR1, HR2, HR3, HR4 done. After the heating zone has been heated, the heater HR4 would be deactivated and the heaters HR1, HR2, HR3 would remain activated. Since the heating power of the remaining three heaters HR1, HR2, HR3 is lower than that in the The desired temperature existing heat loss would initially drop the actual temperature (after any existing after-heat effects). If the actual temperature has dropped below a certain lower threshold, the heater HR4 would be reactivated, causing the actual temperature to rise again. The temperature control would then be done by intermittently activating / deactivating the heater HR4 at constant operation
- Heating devices HR1, HR2, HR3 done.
- the load fluctuations in the electrical grid and the switching frequency can be significantly reduced.
- the gradient of the temporal temperature increase to achieve the target temperature and / or the gradient of the temporal
- Temperature drop when operating the heating zone I, II with the Grundloomlast are determined. Furthermore, it may be provided to change the number of active heaters HR used for the basic heating load in order to adapt the basic heating load to current conditions (for example, a changed ambient temperature). Thus, for example, the number of active heaters HR used for the basic heating load can be reduced by one if, when increasing the heating power compared to the basic heating load by connecting another
- Heating device HR (second operating mode), the measured actual temperature in the region of the heating zone I, II, the target temperature ST by a predetermined
- the base heating load can be reduced if a temperature-wise or temporally strong overshoot in the temperature control is achieved.
- the basic heating load can be reduced if the
- Temperature difference value lies in the range between 1 ° C and 5 ° C, in particular 2 ° C, 3 ° C or 4 ° C and / or which is the predetermined period of time in the range between 30sec and 3min, in particular 1 min, 1, 5min or 2min or more.
- the ratio of a first period of time in which a heating zone is operated above the base heating load to a second period of time in which the heating zone is operated below the base heating load may be used to vary the number of heaters HR active in the base heating load. So can
- a ratio of the first time period to the second time duration determined by the control device 3 or an associated control computer and compared with a threshold. In the event that the calculated value falls below the threshold value, the number of active at Grundloomlast
- Heater HR can be reduced, especially by a single
- the time duration ratio can be averaged over a period of several switching cycles and this averaged value for the
- the switching means 4 can also be designed to monitor or monitor the respective heating devices HR connected to them.
- the switching means 4 for example, to monitor the electrical load or the electrical power consumption of the connected to them
- Heating device HR be formed. Because of this monitoring or
- Monitoring capability can be detected, for example, if the heating device HR provides no or only a low heat output, resulting in insufficient shrinkage performance in the area of the shrinking tunnel 6.
- Control device 3 may be coupled and emit an error signal when no or only a small heating power of the heater HR is detected.
- the switching means 4 may be designed to permanently disconnect the heating device HR from the power supply, for example in the case of an electrical short circuit.
- the switching means 4 can be designed to control the heating device HR in accordance with the oscillation packet control. In this case, as shown in Figure 4, in contrast to the phase control, the heater HR switched only in the zero crossings of the temporal current or voltage curve. As a result, current and voltage transients and thus harmonics can be largely avoided.
- the switching means 4 can be formed, in particular, by a semiconductor contactor, for example a 2/3-phase semiconductor contactor (RGC2 / RGC3) from the manufacturer Carlo Gavazzi.
- a semiconductor contactor for example a 2/3-phase semiconductor contactor (RGC2 / RGC3) from the manufacturer Carlo Gavazzi.
- the semiconductor contactor has, for example, a
- Fig. 5 shows the time course of the electrical power consumption of a
- the time-varying, jagged curve K1 shows the electrical power consumption of a device according to the above-described prior art, in which the Grundfillast is very low and the other heating devices are always switched on and off simultaneously to control the actual temperature.
- the underlying curve K2 shows a much lower temporal fluctuation frequency, with the performance remaining at a certain level of performance longer.
- the amplitude of the power change is much lower.
- Heating devices are significantly reduced by frequent switching on and off.
- the consumed average electrical power of the device 1 can be reduced, so that the energy efficiency of the device 1 is also increased.
- the invention has been described above by means of exemplary embodiments. It is understood that a variety of changes or modifications are possible without thereby departing from the inventive concept underlying the invention. LIST OF REFERENCE NUMBERS
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL18717574T PL3609792T3 (pl) | 2017-04-11 | 2018-04-10 | Sposób regulacji mocy grzewczej urządzeń obkurczających i odpowiednie urządzenie |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017107766.9A DE102017107766A1 (de) | 2017-04-11 | 2017-04-11 | Verfahren und Vorrichtung zum Bilden von Gebinden |
| PCT/EP2018/059096 WO2018189141A1 (de) | 2017-04-11 | 2018-04-10 | Verfahren zur regelung der heizleistung von schrumpfvorrichtungen und entsprechende vorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3609792A1 true EP3609792A1 (de) | 2020-02-19 |
| EP3609792B1 EP3609792B1 (de) | 2021-09-15 |
Family
ID=61972114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18717574.0A Active EP3609792B1 (de) | 2017-04-11 | 2018-04-10 | Verfahren zur regelung der heizleistung von schrumpfvorrichtungen und entsprechende vorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3609792B1 (de) |
| DE (1) | DE102017107766A1 (de) |
| PL (1) | PL3609792T3 (de) |
| WO (1) | WO2018189141A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018132737A1 (de) * | 2018-12-18 | 2020-06-18 | Krones Aktiengesellschaft | Verfahren und Schrumpftunnel zum Aufschrumpfen thermoplastischen Verpackungsmaterials auf Artikel |
| CN115291649B (zh) * | 2022-08-09 | 2024-07-05 | 西门子(中国)有限公司 | 烘箱的温度控制方法、膜包机的温度控制方法、烘箱和膜包机 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6394796B1 (en) * | 1999-11-04 | 2002-05-28 | Alan D. Smith | Curing oven combining methods of heating |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3678244A (en) * | 1971-06-18 | 1972-07-18 | Paul W Worline | Film shrinking tunnel utilizing hot air and water as heat transfer medium |
| DE2610385A1 (de) * | 1976-03-12 | 1977-09-15 | Riedhammer Ludwig Fa | Platten-durchschubofen zum sintern von ferriten |
| GB2246110B (en) * | 1990-12-07 | 1995-02-15 | Balair Systems Ltd | Method and apparatus for the packaging of products |
| 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 |
| BR112014011429A2 (pt) * | 2011-11-10 | 2017-05-02 | Shawcor Ltd | aparelho contendo múltiplas áreas de aquecimento infravermelho utilizadas sequencialmente para objetos tubulares |
| DE102013215415A1 (de) * | 2013-08-06 | 2015-02-12 | Krones Aktiengesellschaft | Verfahren und Vorrichtung zum Schrumpfen von Materialien auf Artikel und/oder auf eine Zusammenstellung von Artikeln |
-
2017
- 2017-04-11 DE DE102017107766.9A patent/DE102017107766A1/de not_active Withdrawn
-
2018
- 2018-04-10 EP EP18717574.0A patent/EP3609792B1/de active Active
- 2018-04-10 WO PCT/EP2018/059096 patent/WO2018189141A1/de not_active Ceased
- 2018-04-10 PL PL18717574T patent/PL3609792T3/pl unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6394796B1 (en) * | 1999-11-04 | 2002-05-28 | Alan D. Smith | Curing oven combining methods of heating |
Also Published As
| Publication number | Publication date |
|---|---|
| PL3609792T3 (pl) | 2022-02-07 |
| EP3609792B1 (de) | 2021-09-15 |
| WO2018189141A1 (de) | 2018-10-18 |
| DE102017107766A1 (de) | 2018-10-11 |
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