US20190118981A1 - Method and machines for filling flexible tubular-bag packages - Google Patents

Method and machines for filling flexible tubular-bag packages Download PDF

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Publication number
US20190118981A1
US20190118981A1 US16/098,361 US201716098361A US2019118981A1 US 20190118981 A1 US20190118981 A1 US 20190118981A1 US 201716098361 A US201716098361 A US 201716098361A US 2019118981 A1 US2019118981 A1 US 2019118981A1
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Prior art keywords
vacuum
tubular
product
blowing
metering
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Abandoned
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US16/098,361
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English (en)
Inventor
Gerhard Kuss
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Rovema GmbH
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Rovema GmbH
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Assigned to ROVEMA GMBH reassignment ROVEMA GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUSS, GERHARD
Publication of US20190118981A1 publication Critical patent/US20190118981A1/en
Abandoned legal-status Critical Current

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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
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/28—Controlling escape of air or dust from containers or receptacles during filling
    • 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
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/04—Methods of, or means for, filling the material into the containers or receptacles
    • B65B1/10—Methods of, or means for, filling the material into the containers or receptacles by rotary feeders
    • B65B1/12—Methods of, or means for, filling the material into the containers or receptacles by rotary feeders of screw type
    • 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
    • B65B37/00—Supplying or feeding fluent-solid, plastic, or liquid material, or loose masses of small articles, to be packaged
    • B65B37/08—Supplying or feeding fluent-solid, plastic, or liquid material, or loose masses of small articles, to be packaged by rotary feeders
    • B65B37/10—Supplying or feeding fluent-solid, plastic, or liquid material, or loose masses of small articles, to be packaged by rotary feeders of screw type
    • 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/146—Closing bags

Definitions

  • the invention relates to a method for continuous or intermittent production of tubular-bag packages using a tubular-bag machine according to the preamble of claim 1 . Furthermore, the invention relates to a tubular-bag machine for carrying out the method.
  • tubular-bag machines In known tubular-bag machines, a plurality of different products is packaged into tubular-bag packages. These products can be powders or granulates. It is often desirable, in particular in the case of grainy or fine-grained products, for the gas contained in the product, such as air or inert gas, to be extracted from the product during processing on the tubular-bag machine so as to compact the product. Compacting of this kind is often very important at the outlet of the metering tube, in particular, in order to prevent undesired trickling of the product, which might otherwise end up in the fusion zone of the tubular bags to be sealed.
  • the compactor generically provided in the tubular-bag machine for compacting the product by extracting gas can be employed anywhere in the metering tube. The compactor can be disposed ahead of or behind the metering tube. It is also conceivable for the compactor to be disposed within the extension of the metering tube, such as in the middle of the metering tube.
  • Tubular-bag machines comprising generic compactors are known from DE 39 15 144 A1 and from EP 1 033 332 A2, for example.
  • These compactors comprise a suction bushing permeable to gas through fine pores, the product to be degassed being led past the inside of the suction bushing.
  • the suction bushing itself is surrounded at its outside by a vacuum chamber which can be subjected to a vacuum via a corresponding pressure supply. Once the vacuum chamber has been subjected to the vacuum, the gas is sucked into the vacuum chamber from the outside through the pores, whereby the product led past the suction bushing is degassed.
  • the pores of the suction bushing need to have a pore width that is smaller than the average particle size of the product in order to prevent the product particles from being sucked into the vacuum chamber.
  • One problem of the known vacuum compactors of generic tubular-bag machines is that the suction bushings become increasingly blocked after a certain operating time. Said blockage of the suction bushings is caused by product particles depositing within the pores of the suction bushings and closing them entirely or at least partially. With increasing blockage of the suction bushing, the vacuum existing in the vacuum chamber can no longer be transferred through the pores of the suction bushing, causing the degassing of the product to continuously decrease as the blockage of the suction bushing grows. The growing blockage of the suction bushing can in particular also cause the compaction of the product by gas extraction to become more irregular. Said irregularity is undesirable because it leads to greater metering tolerances regarding the amount of product to be metered per package.
  • the object of the present invention is to propose a new method for continuous or intermittent production of tubular-bag packages using a tubular-bag machine by means of which the amount of work for cleaning the blocked compactor is reduced and downtimes are avoided. Furthermore, compaction of the product is to be kept within freely adjustable limits so as to achieve high metering accuracy and process reliability of the metering process, resulting in economic advantages. Furthermore, the object of the invention is to propose a tubular-bag machine for carrying out the method.
  • a suctioning phase is performed during the work cycle in the known manner.
  • a vacuum is established in the vacuum chamber in the known way so as to compact the product by sucking gas out through the pores of the suction bushing.
  • the vacuum in the vacuum chamber can be lifted to ambient pressure between the individual suctioning phases.
  • the suctioning phases associated with the individual work cycles can seamlessly transition into each other for some time. This means that the vacuum in the vacuum chamber stays the same for multiple work cycles, whereby a permanent compaction during these work cycles is realized.
  • the gas may usually be air.
  • the gas can of course also be a corresponding inert gas.
  • the basic idea of the method according to the invention is that the pores of the suction bushing are cleaned during the tubular-bag production process with its cyclically repeating work cycles so as to avoid downtimes as those caused by interruption of the tubular-bag production process.
  • the actual cleaning of the pores of the suction bushing is effected by integration of a blowing phase, during which the vacuum chamber is pressurized, in at least one work cycle.
  • the pressure in the vacuum chamber during the blowing phase causes the gas to flow in the opposite direction from the vacuum chamber through the pores of the suction bushing in the direction of the product, at least some of the product particles stuck in the pores thus being removed.
  • the length and intensity of the cleaning by blowing the pores of the suction bushing is to be selected in such a way that, on the one hand, a sufficient cleaning effect is achieved and, on the other hand, there remains enough process time for carrying out the compacting in the suctioning phases.
  • the intervals at which the blowing phases according to the invention for cleaning the suction bushing are executed during the tubular-bag production process are generally optional as long as a sufficient cleaning effect is achieved. In particular, this is because the frequency of the blowing phases depends on the particular product to be packaged since powdery products, in particular, have a stronger tendency to block the pores of the suction bushing.
  • a particularly simple strategy for cleaning the suction bushing intends for the blowing phases to be executed after a regular number of work cycles in each case. For example, it may be intended that after each three, five or ten tubular bags, a short blowing phase is executed in the respective next work cycle in order for the particles that have accumulated in the pores in the previous work cycles and now adhere to the insides of the pores to be blown out again. In the case of products with a strong tendency to cause blockage, it may also be intended for a short blowing phase to be part of each work cycle, a suctioning phase and a blowing phase thus being run during each work cycle in this case.
  • the suction bushing can also be blown as a function of the process time for which the suction bushing has been used in compacting the product.
  • the suction bushing is cleaned by blowing at regular intervals of, for example, three, five or ten minutes during the work cycle that follows next in each case.
  • blowing phases are executed as a function of the work cycles and of the process time, the number of work cycles and the duration of the process time before execution of the next blowing phase, respectively, have to be set by operating personnel. Said setting will be made based on operating personnel's experience as to how heavily the suction bushing becomes blocked during processing of a particular product. Naturally, mistakes can happen in this process, which may cause the number of blowing phases to be too small to ensure sufficient cleaning of the suction bushing. Hence, in order to avoid such mistakes, it is particularly advantageous if the effective vacuum during the suctioning phases is measured using a pressure sensor. This is advantageous because the degree of blockage of the suction bushing can be assessed based on these measured vacuum values and the manner of cleaning by blowing the suction bushing can be varied as a function of the measured values.
  • the process parameters for blowing the suction bushing are changed as a function of the vacuum values measured using the pressure sensor.
  • the duration of the individual blowing phases can be varied as a function of the measured vacuum values so as to clean the suction bushing more thoroughly by longer blowing phases if the vacuum values deteriorate, for example.
  • the pressure level in the blowing phases can be changed as a function of the vacuum values measured using the pressure sensor.
  • the pressure level in the blowing phases can be changed as a function of the vacuum values measured using the pressure sensor.
  • the time between the individual blowing phases can be varied as a function of the measured vacuum values. For example, if the vacuum values indicate growing blockage of the pores in the suction bushing, the frequency of the blowing phase can be increased.
  • the process can start with a blowing phase frequency at which the pores of the suction bushing are cleaned by blowing only every ten work cycles, for example.
  • the blowing phase frequency can be increased in increments so that a blowing phase may be executed every nine, then every eight, then every seven, then every six, then every five, then every four, then every three, then every two work cycles and, finally, at the end of each work cycle.
  • the tubular-bag production process should be interrupted because reliable operation of the tubular-bag machine is no longer ensured given the insufficient vacuum level.
  • a limit value that the measured vacuum must not fall short of is stored in the controller of the tubular-bag machine. If the limit value is no longer reached during the tubular-bag production process in this case, the tubular-bag production process is interrupted or an error is reported.
  • the limit value for the vacuum during the suctioning phases depends not only on the degree to which the pores in the suction bushing are cleaned but also on the particular product to be packaged, which means that said limit value has to be defined specifically for each product.
  • a preferred version of the method intends for the effective vacuum during a suctioning phase using a cleaned suction bushing to be measured using the pressure sensor and to be stored as an initial vacuum value.
  • Said initial vacuum value represents the margins cleared when the suction bushing is clean and the maximum vacuum that can be achieved when the particular product is being packaged.
  • the limit value for interruption of the tubular-bag production process or for reporting an error can then be determined as a function of said measured initial vacuum value.
  • the limit value is 10%, 20%, 30%, 40% or 50% below the initial vacuum value. If the measured vacuum falls short of said threshold derived from the initial vacuum value, i.e. if the measured vacuum value is 10%, 20%, 30%, 40% or 50% below the initial vacuum value, the tubular-bag production process is interrupted or an error is reported so as to allow operating personnel to take suitable countermeasures, such as removal and cleaning of the suction bushing or replacing the blocked suction bushing with a new suction bushing.
  • the tubular-bag machine according to the invention has a conventional structure including a screw-type metering device and, provided thereon, a compactor having a suction bushing.
  • a vacuum source as is the case in the state of the art but, according to the invention, also to a pressure source.
  • the compactor will be controlled by the controller as a function of the process parameters of the tubular-bag production process in such a manner that, as a function of the process, blowing phases in which the vacuum chamber is subjected to pressure from the pressure source are executed.
  • the pressure during the blowing phases causes the pores of the suction bushing to be cleaned by blowing out product particles that adhere to the insides of the pores. Cleaning of the pores of the suction bushing takes place during the tubular-bag production process, thus avoiding downtimes for this manner of cleaning.
  • the architecture of the screw-type metering device of the tubular-bag machine is basically optional.
  • the screw-type metering device can be a filling metering screw which is disposed immediately above the sealing jaws which are provided for sealing the tubular bags.
  • Compactors working with vacuum are widely used with these filling metering screws because they allow reliable prevention of trickling of the product into the fusion zone of the sealing jaws located below.
  • the screw-type metering device can also be configured in the manner of a feeding screw which is disposed in front of a storage tank for intermediate storage of the product.
  • FIG. 1 shows a side view of a schematically illustrated tubular-bag machine having a compactor
  • FIG. 2 shows a cross-section of the compactor of the tubular-bag machine of FIG. 1 ;
  • FIG. 3 shows a perspective side view of the compactor of FIG. 2 ;
  • FIG. 4 shows a time diagram of the process parameters of a first method for cleaning the compactor of FIG. 2 ;
  • FIG. 5 shows a time diagram of the process parameters of a second method for cleaning the compactor of FIG. 2 ;
  • FIG. 6 shows a time diagram of the process parameters of a third method for cleaning the compactor of FIG. 2 ;
  • FIG. 7 shows a time diagram of the process parameters of a fourth method for cleaning the compactor of FIG. 2 .
  • FIG. 1 shows a schematic side view of a tubular-bag machine 01 for producing tubular-bag packages 02 .
  • the tubular-bag machine 01 is illustrated only with the components that are necessary for understanding the invention.
  • the latter is first fed into a storage tank 04 and then fed in metered amounts from the storage tank 04 into the tubular-bag packages 02 by a metering screw 05 being driven to rotate.
  • a compactor 07 by means of which air or inert gas can be sucked from the product to be discharged at the end of the metering tube 06 is located at the lower end of the metering tube 06 .
  • the compactor 07 can be selectively connected to a pressure source 11 and to a vacuum source 12 .
  • a switching valve 13 controlled by a controller 14 is provided for switching between the pressure source 11 and the vacuum source 12 .
  • the controller 14 for controlling the pressure supply at the compactor 07 can of course also be integrated in the main controller of the tubular-bag machine 01 .
  • a pressure sensor 15 by means of which the vacuum effective at the compactor 07 during operation of the compactor 07 can be measured.
  • the pressure sensor can alternatively also be disposed on one of the pressure lines.
  • the data of the pressure sensor 15 is transmitted to the controller 14 via a data line.
  • the controller 14 is connected to the drive 09 via a data line. In this way, the operating state can be transmitted to the controller 14 as the metering screw 05 is being driven.
  • the pressure from the pressure source 11 and the vacuum from the vacuum source 12 are transferred to the compactor 07 via a pressure line 16 starting from the switching valve 13 .
  • FIG. 2 shows the compactor 07 including the pressure sensor 15 and the pressure line 16 in an enlarged sectional view.
  • the compactor 07 is located at the lower end of the metering tube 06 , in which the metering screw 05 for metering the products 03 can be driven to rotate.
  • the metering tube 06 is illustrated in the unfilled state in order to facilitate understanding of the compacting device 07 .
  • a suction bushing 17 for sucking gas from the product to be conveyed by the metering screw 05 is provided.
  • the suction bushing 17 is composed of a perforated support plate 18 on which the fine-pored filter mat 19 rests.
  • the suction bushing 17 is surrounded by a vacuum chamber 20 which can be selectively subjected to pressure or to vacuum via the pressure line 16 .
  • the vacuum chamber 20 is subjected to a vacuum, the gas is sucked out of the product conveyed by the screw 05 through the pores of the filter mat 19 into the vacuum chamber 20 , whereby the product is compacted in the desired manner.
  • the vacuum chamber 20 is then subjected to pressure in another work cycle, the gas flows in the opposite direction through the pores of the filter mat 19 , the product particles adhering to the inside of the pores thus being blown out. In this way, the desired cleaning effect for cleaning the suction bushing 17 is achieved.
  • FIG. 3 shows the lower end of the suction tube 06 , the metering screw 05 , the compactor 07 including the pressure sensor 15 and the pressure line 16 , and a product die 21 in a combined perspective illustration.
  • FIG. 4 shows a first method for cleaning the compactor 07 by blowing as per the invention.
  • FIG. 4 illustrates the flow of a tubular-bag production process in a window of three work cycles, the individual work cycles being separated from each other by dashed vertical lines.
  • the speed of rotation of the metering screw 05 during the individual work cycles is marked out.
  • the metering screw stands still up to time t 1 and is then driven at a constant speed of rotation by the drive 09 for a predefined process time so as to feed a specific amount of the product 03 into a tubular bag 02 .
  • the speed of rotation of the metering screw 05 is reset to zero.
  • the pressure to which the vacuum chamber 20 is pressurized via the pressure line 16 is marked out.
  • vacuums P ⁇ are marked out upward and pressures P+ are marked out downward.
  • a vacuum from the vacuum source 12 is established in the vacuum chamber 20 via the pressure line 16 during every single work cycle at time t 1 synchronously to the rotation of the metering screw 05 so as to suck gas from the product 03 waiting in the metering tube during the thus defined suctioning phases 29 .
  • the vacuum is maintained starting at time t 1 until time t 3 within the suctioning phases 29 during each work cycle.
  • Time t 3 occurs shortly after the switch-off time t 2 of the metering screw in order to ensure, by corresponding compacting of the product even after the metering screw 05 has been switched off, that the product 03 does not drop out of the metering tube 06 into the fusion zone between the sealing jaws 08 .
  • the version of the method illustrated in FIG. 4 intends for the pores in the filter mat 19 to be cleaned in every third work cycle during a blowing phase 28 .
  • the switching valve 13 is switched and the vacuum chamber 20 is then subjected to pressure from the pressure source 11 via the pressure line 16 .
  • the pressure impulse ends at time t 5 shortly prior to the start of the respective fourth work cycle.
  • the pressure impulse briefly blows the pores in the filter mat 19 of the suction bushing 17 and blows the product particles stuck therein back into the direction of the metering screw 05 .
  • FIG. 5 shows an alternative version of the method in a time diagram in which the speed of rotation of the metering screw 05 is marked out in the upper part and the pressure supply of the compactor 07 is marked out in the lower part.
  • cleaning of the suction bushing 17 takes place by way of blowing phases 28 during every single work cycle in the method illustrated in FIG. 5 .
  • the pressure supply is switched to pressure at time t 6 during every single work cycle, whereby the pores in the filter mat 19 are blown. Then, at time t 7 shortly prior to the end of the respective work cycle, the pressure supply is reset to zero.
  • FIG. 6 the time diagram of another version of the method for cleaning the compactor 07 by blowing the pores in the filter mat 19 during the tubular-bag production process is schematically illustrated.
  • the individual work cycles of the tubular-bag production process are again separated from each other by dashed vertical lines.
  • the vacuum chamber 20 is again subjected to the vacuum from the vacuum source 12 between times t 1 and t 3 during every single work cycle.
  • the effective vacuum in the vacuum chamber during application of the vacuum from the vacuum source 12 is measured using the pressure sensor 15 .
  • Said effective vacuum in the vacuum chamber 20 during the first work cycle is stored as an initial vacuum value 22 . Since the pores of the suction bushing 17 are not yet blocked at the beginning of the tubular-bag production process, the initial vacuum value 22 is below the vacuum level from the vacuum source 12 .
  • a limit value 23 which serves to trigger cleaning of the compactor 07 by blowing the pores in the suction bushing 17 is determined based on the measured initial vacuum value 22 .
  • the limit value 23 can be double the initial vacuum value 22 , for example.
  • FIG. 7 the process parameters of another version of the method for cleaning the compactor of FIG. 2 are presented in a time diagram.
  • This version of the method largely corresponds to the version of the method illustrated in FIG. 6 .
  • this version of the method intends for the blowing phases 30 to seamlessly transition into each other starting from initial time t 10 of the first work cycle.
  • the limit value 23 serving to trigger cleaning of the compactor 07 by blowing the pores in the suction bushing 17 is determined based on the measured initial vacuum value 22 .
  • the measured vacuum pressure 31 is just barely below the limit value 23 .
  • the measured vacuum value 32 is then just above the limit value 23 , which causes the controller to trigger a cleaning cycle including a blowing phase 33 so as to clean the pores by blowing out deposited particles.
  • the vacuum chamber is permanently subjected to a vacuum again so as to compact the product by sucking out gas.
  • another cleaning cycle including a blowing phase 33 will be triggered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vacuum Packaging (AREA)
US16/098,361 2016-05-02 2017-04-03 Method and machines for filling flexible tubular-bag packages Abandoned US20190118981A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102016207549.7A DE102016207549A1 (de) 2016-05-02 2016-05-02 Verfahren zur kontinuierlichen oder intermittierenden Herstellung von Schlauchbeutelverpackungen und Schlauchbeutelmaschinen
DE102016207549.7 2016-05-02
PCT/EP2017/057826 WO2017190899A1 (de) 2016-05-02 2017-04-03 Verfahren und maschinen zur befüllung von flexiblen schlauchbeutelverpackungen

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US20190118981A1 true US20190118981A1 (en) 2019-04-25

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US16/098,361 Abandoned US20190118981A1 (en) 2016-05-02 2017-04-03 Method and machines for filling flexible tubular-bag packages

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US (1) US20190118981A1 (de)
EP (1) EP3452376A1 (de)
DE (1) DE102016207549A1 (de)
WO (1) WO2017190899A1 (de)

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US20190233140A1 (en) * 2016-09-08 2019-08-01 Ica Spa System and method for packaging powders
US11059611B2 (en) 2017-05-30 2021-07-13 Haver & Boecker Ohg Apparatus and method for compacting packages filled with bulk material
US11286071B2 (en) * 2016-12-02 2022-03-29 Ica S.P.A. System for measuring out and cutting compacted powders
CN114955023A (zh) * 2022-06-30 2022-08-30 衢州华友钴新材料有限公司 立式粉体充填机构及其制备方法和粉体装钵装置

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CN113511351A (zh) * 2020-04-09 2021-10-19 Sis公司 粉体统一处理系统
CN114435647A (zh) * 2022-01-25 2022-05-06 麦锡祥 一种粉剂药品包装降尘进料装置
CN115285698B (zh) * 2022-10-08 2022-12-23 常州市金马高分子材料有限公司 一种含氟高分子材料造粒机的粉末上料设备

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