EP0847926A1 - Device for cutting a strip-like package - Google Patents

Device for cutting a strip-like package Download PDF

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Publication number
EP0847926A1
EP0847926A1 EP97121053A EP97121053A EP0847926A1 EP 0847926 A1 EP0847926 A1 EP 0847926A1 EP 97121053 A EP97121053 A EP 97121053A EP 97121053 A EP97121053 A EP 97121053A EP 0847926 A1 EP0847926 A1 EP 0847926A1
Authority
EP
European Patent Office
Prior art keywords
sealing
product carrier
web
knife roller
reflection sensor
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
EP97121053A
Other languages
German (de)
French (fr)
Other versions
EP0847926B1 (en
Inventor
Paul Scharbrodt
Siegbert Feja
Eckhard Hoffmann
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.)
Bayer Bitterfeld GmbH
Original Assignee
Bayer Bitterfeld GmbH
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Filing date
Publication date
Application filed by Bayer Bitterfeld GmbH filed Critical Bayer Bitterfeld GmbH
Publication of EP0847926A1 publication Critical patent/EP0847926A1/en
Application granted granted Critical
Publication of EP0847926B1 publication Critical patent/EP0847926B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
    • B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
    • B65B61/08—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting using rotary cutters
    • 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
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/18—Registering sheets, blanks, or webs
    • 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
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/04—Enclosing successive articles, or quantities of material between opposed webs one or both webs being formed with pockets for the reception of the articles, or of the quantities of material
    • 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
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0515—During movement of work past flying cutter
    • 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
    • Y10T83/00—Cutting
    • Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
    • Y10T83/159—Including means to compensate tool speed for work-feed variations
    • 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
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4737—With tool speed regulator

Definitions

  • the invention relates to a device for the accurate cutting of a strip-shaped, in the longitudinal direction clockwise or continuously transported product carrier with successively arranged, airtight sealed cells, in which sensitive products are packaged.
  • a device basically exists from a rotating knife roller, the product carrier in each area one between two cells, arranged transversely to the longitudinal direction and severed with a grid-like embossed sealing bar.
  • Sensitive products are solid, pasty or liquid products, those regarding drying out or penetration of moisture or also sensitive to their sterility (contamination by microorganisms) are.
  • Typical products in the food industry are e.g. Mustard, mayonnaise or Ketchup and in the pharmaceutical industry tablets, dragees, or skin gels Anoint.
  • each tablet is in an airtight cell, the outside is bordered by sealed seams.
  • Packaging materials are particularly suitable for aluminum composite films.
  • a strip unit with tablets is removed from the storage pack and torn open the film near a tablet so that the tablet for Available.
  • the tablets are taken from the sealing machine in the production plant airtight sealed provided on a tray, each Tablet enclosed in the Carrée by two longitudinal sealing bars and two transverse sealing bars is.
  • the longitudinal sealing webs are parallel to the edges of the Foil carrier and the transverse sealing webs arranged perpendicular to it.
  • a rotating knife roller is usually used as the cutting device, which is in a fixed cycle ratio with the preceding sealing roller, so that the separating cut is as precise as possible ( ⁇ 1mm) in the middle of a cross sealing bar he follows.
  • the tolerances the sealing seams or webs in the longitudinal direction due to length fluctuations of the tablet holder are so large that the accuracy required above is not can be reached.
  • Such fluctuations are due to the fact that the Tablet holder alternately accelerated and braked during production and is therefore exposed to strong mechanical loads.
  • the one from it resulting inaccuracy in the separating cut has the consequence that the cross seal bar in unfavorable cases it is cut at the edge or even outside the web width and no longer guarantees the required reliable, tight sealing of the tablets is. In these cases air or moisture can penetrate and the durability the tablets are severely impaired. In the worst case, even whole lots have to be be blocked.
  • the invention is based, with a film-like product carrier the task (Strip packaging) with sealed products the separation cut within a cross-seal bar with lattice-like embossing between two product lines to be carried out with such high accuracy that the finished packaged products a sufficiently large seal edge width remains and a hermetically airtight Closure of the sealed products and accordingly the intended ones Best before dates can be guaranteed.
  • the task is the control of the knife roller to cut the pack-appropriate Product strips depending on the position of the cross seal in the longitudinal direction control that the separating cut is as close as possible in the middle of the web is coming.
  • this object is achieved according to the invention solved in that for recognition and localization with an embossing provided cross sealing web above and / or below the film-like product carrier an optical reflection sensor is arranged which corresponds to the lattice structure AC voltage signal generated when the sealing bar in the detection area of the reflection sensor, the number of periods being a measure of the Width b of the transverse sealing web is, and that an evaluation circuit for the AC voltage signal is provided, which is the rotational speed of the knife roller controls that the cut is made in the middle (b / 2) of the cross seal.
  • the invention is therefore based on the fact that the optical measuring device detects the position of each Cross seal bar and thus also its center detected and individually recognized and from it depending on the knife roller actuated.
  • the optical measuring device detects the position of each Cross seal bar and thus also its center detected and individually recognized and from it depending on the knife roller actuated.
  • the product packaging is therefore not with a fixed clock ratio between the Sealing machine and the knife roller worked, but with a variable, from the actual position of the sealing bar dependent clock.
  • the products are particularly moisture-sensitive or sterile-sensitive pharmaceutical products, such as. Tablets, dragees or ointments.
  • the reflection sensor preferably consists of a triangulation principle working optoelectronic position measuring system.
  • the function exists the evaluation circuit in that depending on the measurement technology Position of the center of the cross seal bar the speed of rotation of the knife roller is reduced or enlarged.
  • each tablet 2 is in a square Sealed field (Carrée), that in the x-direction of longitudinal sealing bars 3 and in the y-direction is limited by cross sealing webs 4.
  • the tablet carrier 1 consists of a two-layer aluminum composite film. When sealing is in each case a moisture-sensitive tablet 2 in a Carrée or a cell hermetically trapped tightly between the two layers.
  • the sealing bars 3, 4 have one Width b of approx. 4 mm and are provided with a lattice-like embossing.
  • Tablet holder 1 is in the assembly operation in the x direction (longitudinal direction) transported and from a cutting roller in the y direction (transverse direction) eachfuge cut into smaller tablets, the one shown here Example each contain four tablets 2.
  • the desired target position for the separating cut 5 lies in the middle of the transverse sealing web 4, with a tolerance of ⁇ 0.5 mm should be observed. So far, this requirement could only be Practice cannot be met.
  • the separation step takes place on the edge or even outside the seal edge width b is the airtight packaging and thus the prescribed The durability of the tablets is no longer guaranteed.
  • an optical measuring device in the form of a reflection sensor 6 provided that the surface of the tablet carrier 1 between two longitudinal sealing webs 3 scanned with a laser beam 7.
  • the reflection sensor 6 generates an AC voltage signal, whose evaluation the exact position and width of the cross seal bars 4 supplies. Based on this measurement information and control of the web coordinates can then position the separating cut exactly in the middle of each cross seal 4 take place so that the sealing webs enclosing the tablet are always at least have a seal edge width of b / 2 and the hermetically airtight seal the tablets are no longer in question due to a too small sealing margin.
  • Fig. 2 is the sealing machine and the downstream, from a rotating knife roller existing cutting device shown in a side view.
  • the sealing machine consists of two counter-rotating sealing rollers 8 and 9 with sealing zones 10 and 11, which have toothed or corrugated surfaces 12.
  • the sealing machine consists of two counter-rotating sealing rollers 8 and 9 with sealing zones 10 and 11, which have toothed or corrugated surfaces 12.
  • Under the high pressure of the sealing zones rolling on one another becomes those in between two films 13 and 14 of the tablet carrier 1 along a zone b between two successive tablets 2 tightly sealed together.
  • the corrugated surfaces 12 of the sealing zones 10, 11 produce in the sealing zone, i.e. on the surface of the sealing crosspiece 4, the lattice-shaped embossing already mentioned.
  • the lattice-like embossing can also (if the sealing zones are designed accordingly) consist of a large number of small depressions or elevations.
  • the downstream cutting device consists of the knife roller 15 with the Cross cutting 16 and the fixed shear bar 17.
  • the tablet carrier 1 is always cut when the cutting edge 16 on the counter cutting edge 17th passes by.
  • the difference in orbital speeds between the rotating ones Sealing rollers 8 and 9 and the rotating knife roller 15 must consequently be set in this way be that the cross cutting edge 16 always passes the counter cutting edge 17, if the center line of a sealing bar 4 is exactly opposite the shear bar 17 stands. In this case, the separating cut would be exactly as described above In the middle of the sealing bar.
  • the reflection sensor 6 here consists of an after Triangulation principle working, commercially available optoelectronic position measuring system. A very fine point of light is emitted by a laser diode onto the tablet carrier 1 or projected onto the cross seal web 4. Via reception optics this point of light is viewed at an acute angle and is positioned sensitive CCD line 18 (see Fig. 4) shown.
  • the measurement signals are over a fast signal processor processed and output as analog values, the the current distance values between the sensor 6 and that on the surface of the sealing web 4 correspond to the light point migrating in the longitudinal direction.
  • the lattice-like embossing 19 (FIG. 4) of the sealing web becomes a periodic one Generated AC voltage, the time course of which is shown in Fig. 3.
  • the AC voltage sets in when the laser beam 7 enters the land area, and breaks off when the laser beam leaves the land area again. Since the period of AC voltage corresponds to the lattice spacing of the embossments, it can be very exactly determines the position and width and thus also the center b / 2 of the sealing bar will; i.e. the sensor or the evaluation circuit recognizes and localizes the am Sensor passing transverse sealing webs 4 and their center on the tablet carrier 1.
  • Two reflection sensors can also be used to improve the measurement signal-to-noise ratio are used, one sensor the top and the other sensor the Scans the underside of the tablet carrier. In this way e.g. through fluttering movements interference signals caused by the tablet carrier are eliminated.
  • the alternating voltage signal generated in the sensor 6, which is characteristic of the embossing 19 is amplified (amplifier 20) and then fed to an evaluation circuit 21, which generates a control pulse 22 which is on the time axis of the current position of the
  • the middle of the web corresponds to the sealing web 4 just detected by the sensor 6 (see also FIG. 2).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The appliance consists of rotating cutter (15) which separates the product carrier (1) in the region of a linking seal (4) between two sachets embossed with a with a grid pattern (19) across the longitudinal direction of movement of the product carrier. To identify and locate the linking seals an optical reflection sensor (6) is positioned above and/or below the product carrier. The sensor generates an AC signal which corresponds to the grid pattern when the linking seal is in the region of the sensor. The number of cycles provides a measure of the width b of the linking seal. A processor evaluates the AC signal to control the peripheral speed of the rotary cutter to ensure that the separating cut takes place in the middle of the linking seal.

Description

Die Erfindung betrifft eine Vorrichtung zum maßgenauen Schneiden eines streifenförmigen, in Längsrichtung taktförmig oder kontinuierlich weitertransportierten Produktträgers mit hintereinander angeordneten, luftdicht versiegelten Zellen, in denen empfindliche Produkte verpackt sind. Eine derartige Vorrichtung besteht grundsätzlich aus einer rotierenden Messerwalze, die den Produktträger jeweils im Bereich eines zwischen zwei Zellen befindlichen, quer zur Längsrichtung angeordneten und mit einer gitterartigen Prägung versehenen Siegelstegs durchtrennt.The invention relates to a device for the accurate cutting of a strip-shaped, in the longitudinal direction clockwise or continuously transported product carrier with successively arranged, airtight sealed cells, in which sensitive products are packaged. Such a device basically exists from a rotating knife roller, the product carrier in each area one between two cells, arranged transversely to the longitudinal direction and severed with a grid-like embossed sealing bar.

Unter empfindlichen Produkten sind hier feste, pastöse oder flüssige Produkte zu verstehen, die hinsichtlich der Austrocknung oder des Eindringens von Feuchtigkeit oder auch hinsichtlich ihrer Sterilität (Kontamination durch Mikroorganismen) empfindlich sind. Typische Produkte in der Lebensmittelindustrie sind z.B. Senf, Mayonnaise oder Ketchup und in der pharmazeutischen Industrie Tabletten, Dragees, Hautgele oder Salben.Sensitive products are solid, pasty or liquid products, those regarding drying out or penetration of moisture or also sensitive to their sterility (contamination by microorganisms) are. Typical products in the food industry are e.g. Mustard, mayonnaise or Ketchup and in the pharmaceutical industry tablets, dragees, or skin gels Anoint.

Als Packmittel für feuchtigkeitsempfindliche pharmazeutische Präparate in Tablettenform werden häufig Folien verwendet, die um die Tabletten herum zugesiegelt werden; d.h. jede Tablette befindet sich in einer luftdicht abgeschlossenen Zelle, die außen herum von Siegelnähten begrenzt ist. In der Regel sind mehrere, z.B. zwei oder vier, versiegelte Tabletten in einer streifenförmigen Packungseinheit untergebracht. Als Packmaterial sind insbesondere Aluminium-Verbundfolien geeignet. Zum Gebrauch des Medikaments wird eine Streifeneinheit mit Tabletten aus der Vorratspackung entnommen und die Folie in der Nähe einer Tablette aufgerissen, so daß die Tablette zur Verfügung steht. Von der Siegelmaschine im Produktionsbetrieb werden die Tabletten luftdicht eingesiegelt auf einem Folientablettenträger bereitgestellt, bei dem jede Tablette im Carrée von zwei Längssiegelstegen und zwei Quersiegelstegen eingeschlossen ist. Die Längssiegelstege sind parallel zu den Rändern bzw. Kanten des Folienträgers und die Quersiegelstege senkrecht dazu angeordnet. Bei der Konfektionierung und automatischen Verpackung wird nun der Tablettenträger jeweils im Bereich eines Quersiegelstegs abgeschnitten, so daß kleinere streifenförmige Packungseinheiten mit z.B. jeweils zwei oder vier Tabletten hergestellt werden, die dann z.B. in einer Schachtel à 10 bis 40 Einheiten handelsfertig abgepackt werden.As packaging for moisture-sensitive pharmaceutical preparations in tablet form foils are often used which are sealed around the tablets; i.e. each tablet is in an airtight cell, the outside is bordered by sealed seams. As a rule, several, e.g. two or four, sealed tablets housed in a strip-shaped packing unit. As Packaging materials are particularly suitable for aluminum composite films. For use of the drug, a strip unit with tablets is removed from the storage pack and torn open the film near a tablet so that the tablet for Available. The tablets are taken from the sealing machine in the production plant airtight sealed provided on a tray, each Tablet enclosed in the Carrée by two longitudinal sealing bars and two transverse sealing bars is. The longitudinal sealing webs are parallel to the edges of the Foil carrier and the transverse sealing webs arranged perpendicular to it. When assembling and automatic packaging, the tablet carrier is now in each case Cut off the area of a cross seal bar so that smaller strip-shaped Packing units with e.g. two or four tablets are made each then e.g. are packed ready for sale in a box of 10 to 40 units.

Als Abschneidevorrichtung wird üblicherweise eine rotierende Messerwalze eingesetzt, die mit der vorangehenden Siegelwalze in einem festen Taktverhältnis steht, damit der Trennschnitt jeweils möglichst genau (± 1mm) in der Mitte eines Quersiegelstegs erfolgt. In der betrieblichen Praxis hat sich jedoch gezeigt, daß die Toleranzen der Siegelnähte bzw. -stege in Längsrichtung aufgrund von Längenschwankungen des Folientablettenträgers so groß sind, daß die oben geforderte Genauigkeit nicht erreicht werden kann. Solche Schwankungen sind darauf zurückzuführen, daß der Tablettenträger bei laufender Produktion abwechselnd beschleunigt und gebremst wird und somit starken mechanischen Beanspruchungen ausgesetzt ist. Die daraus resultierende Ungenauigkeit beim Trennschnitt hat zur Folge, daß der Quersiegelsteg in ungünstigen Fällen am Rand oder sogar außerhalb der Stegbreite geschnitten wird und die geforderte zuverlässig dichte Einsiegelung der Tabletten nicht mehr gewährleistet ist. In diesen Fällen kann Luft bzw. Feuchtigkeit eindringen und die Haltbarkeit der Tabletten ist stark beeinträchigt. Schlimmstenfalls müssen sogar ganze Partien gesperrt werden.A rotating knife roller is usually used as the cutting device, which is in a fixed cycle ratio with the preceding sealing roller, so that the separating cut is as precise as possible (± 1mm) in the middle of a cross sealing bar he follows. In practice, however, it has been shown that the tolerances the sealing seams or webs in the longitudinal direction due to length fluctuations of the tablet holder are so large that the accuracy required above is not can be reached. Such fluctuations are due to the fact that the Tablet holder alternately accelerated and braked during production and is therefore exposed to strong mechanical loads. The one from it resulting inaccuracy in the separating cut has the consequence that the cross seal bar in unfavorable cases it is cut at the edge or even outside the web width and no longer guarantees the required reliable, tight sealing of the tablets is. In these cases air or moisture can penetrate and the durability the tablets are severely impaired. In the worst case, even whole lots have to be be blocked.

Der Erfindung liegt die Aufgabe zugrunde, bei einem folienartigen Produktträger (Streifenverpackung) mit eingesiegelten Produkten den Trennschnitt innerhalb eines mit gitterartigen Prägungen versehenen Quersiegelstegs zwischen zwei Produktreihen mit einer so hohen Genauigkeit durchzuführen, daß bei den fertig verpackten Produkten eine hinreichend große Siegelrandbreite stehen bleibt und ein hermetisch luftdichter Verschluß der eingesiegelten Produkte und dementsprechend die vorgesehenen Haltbarkeitsdaten garantiert werden können. Inbesondere besteht die Aufgabe, die Steuerung der Messerwalze zum Abschneiden der packungsgerechten Produktstreifen in Abhängigkeit der Lage des Quersiegelstegs in Längsrichtung so zu steuern, daß der Trennschnitt möglichst genau in der Mitte des Stegs zu liegen kommt. The invention is based, with a film-like product carrier the task (Strip packaging) with sealed products the separation cut within a cross-seal bar with lattice-like embossing between two product lines to be carried out with such high accuracy that the finished packaged products a sufficiently large seal edge width remains and a hermetically airtight Closure of the sealed products and accordingly the intended ones Best before dates can be guaranteed. In particular, the task is the control of the knife roller to cut the pack-appropriate Product strips depending on the position of the cross seal in the longitudinal direction control that the separating cut is as close as possible in the middle of the web is coming.

Diese Aufgabe wird, ausgehend von der eingangs beschriebenen Vorrichtung, erfindungsgemäß dadurch gelöst, daß zur Erkennung und Lokalisierung mit einer Prägung versehenen Quersiegelstegs oberhalb und/oder unterhalb des folienartigen Produktträgers ein optischer Reflexionssensor angeordnet ist, der ein der Gitterstruktur entsprechendes Wechselspannungssignal erzeugt, wenn der Siegelsteg im Erfassungsbereich des Reflexionssensors liegt, wobei die Zahl der Perioden ein Maß für die Breite b des Quersiegelstegs ist, und daß eine Auswerteschaltung für das Wechselspannungssignal vorgesehen ist, die die Umlaufgeschwindigkeit der Messerwalze derart steuert, daß der Trennschnitt in der Mitte (b/2) des Quersiegelstegs erfolgt. Die Erfindung beruht also darauf, daß die optische Meßvorrichtung die Position jedes Quersiegelstegs und damit auch dessen Mitte erfaßt und individuell erkennt und davon abhängig die Messerwalze betätigt. Im Gegensatz zu der bisher bekannten Produktkonfektionierung wird demnach nicht mit einem festen Taktverhältnis zwischen der Siegelmaschine und der Messerwalze gearbeitet, sondern mit einem variablen, von der tatsächlichen Lage des Siegelstegs abhängigen Takt. Bei den Produkten handelt es sich insbesondere um feuchtigkeits- oder sterilempfindliche pharmazeutische Produkte, wie z.B. Tabletten, Dragees oder Salben.Starting from the device described at the outset, this object is achieved according to the invention solved in that for recognition and localization with an embossing provided cross sealing web above and / or below the film-like product carrier an optical reflection sensor is arranged which corresponds to the lattice structure AC voltage signal generated when the sealing bar in the detection area of the reflection sensor, the number of periods being a measure of the Width b of the transverse sealing web is, and that an evaluation circuit for the AC voltage signal is provided, which is the rotational speed of the knife roller controls that the cut is made in the middle (b / 2) of the cross seal. The The invention is therefore based on the fact that the optical measuring device detects the position of each Cross seal bar and thus also its center detected and individually recognized and from it depending on the knife roller actuated. In contrast to the previously known product packaging is therefore not with a fixed clock ratio between the Sealing machine and the knife roller worked, but with a variable, from the actual position of the sealing bar dependent clock. The products are are particularly moisture-sensitive or sterile-sensitive pharmaceutical products, such as. Tablets, dragees or ointments.

Vorzugsweise besteht der Reflexionssensor aus einem nach dem Triangulationsprinzip arbeitenden optoelektronischen Wegmeßsystem.The reflection sensor preferably consists of a triangulation principle working optoelectronic position measuring system.

Entsprechend einer besonderen Ausführungsform der Erfindung besteht die Funktion der Auswerteschaltung darin, daß in Abhängigkeit von der meßtechnisch erfaßten Lage der Mitte des Quersiegelstegs die Umdrehungsgeschwindigkeit der Messerwalze verkleinert oder vergrößert wird.According to a special embodiment of the invention, the function exists the evaluation circuit in that depending on the measurement technology Position of the center of the cross seal bar the speed of rotation of the knife roller is reduced or enlarged.

Mit der Erfindung werden folgende Vorteile erzielt:

  • Der Trennschnitt wird mit einer Genauigkeit von ± 0,5 mm in die Mitte des Siegelstegs gelegt. Dadurch werden Schnittfehler verhindert, die zu undichten Produktzellen und damit zu gravierenden Verpackungsfehlern führen.
  • Durch den Ausschluß dieser Fehlerquelle kann die geforderte Produkthaltbarkeit zuverlässig eingehalten werden. Die sonst übliche Nachkontrolle kann entfallen.
  • Die Vernichtung von Fertigware mit fehlerhaft geschnittenen Siegelstegen und Kundenreklamationen aufgrund verdorbener Ware werden vermieden.
The following advantages are achieved with the invention:
  • The separating cut is made with an accuracy of ± 0.5 mm in the middle of the sealing bar. This prevents cutting errors that lead to leaky product cells and thus to serious packaging errors.
  • By excluding this source of error, the required product durability can be reliably met. The usual follow-up inspection can be omitted.
  • The destruction of finished goods with incorrectly cut sealing bars and customer complaints due to spoiled goods are avoided.

Im folgenden wird die Erfindung an Hand von Ausführungsbeispielen und Zeichnungen näher erläutert. Es zeigen

Fig. 1
einen streifenförmigen Tablettenträger mit den eingesiegelten Tabletten in Verbindung mit einem optischen Reflexionssensor in perspektivischer Darstellung
Fig. 2
schematisch den Durchlauf des streifenförmigen Tablettenträgers durch eine Siegel- und anschließende Schneidevorrichtung
Fig. 3
das am Reflexionssensor anstehende Wechselspannungssignal und
Fig. 4
ein Blockschaltbild für die Signalverarbeitung.
The invention is explained in more detail below on the basis of exemplary embodiments and drawings. Show it
Fig. 1
a strip-shaped tablet carrier with the sealed tablets in connection with an optical reflection sensor in a perspective view
Fig. 2
schematically the passage of the strip-shaped tablet carrier through a sealing and subsequent cutting device
Fig. 3
the AC voltage signal present at the reflection sensor and
Fig. 4
a block diagram for signal processing.

Bei dem in Fig. 1 dargestellten Tablettenträger 1 ist jede Tablette 2 in einem quadratischen Feld (Carrée) eingesiegelt, das in x-Richtung von Längssiegelstegen 3 und in y-Richtung von Quersiegelstegen 4 begrenzt wird. Der Tablettenträger 1 besteht aus einer zweischichtigen Aluminium-Verbundfolie. Bei der Versiegelung wird jeweils eine feuchtigkeitsempfindliche Tablette 2 in einem Carrée bzw. einer Zelle hermetisch dicht zwischen den beiden Schichten eingeschlossen. Die Siegelstege 3, 4 haben eine Breite b von ca. 4 mm und sind mit einer gitterartigen Prägung versehen. Der Tablettenträger 1 wird im Konfektionierungsbetrieb in x-Richtung (Längsrichtung) weitertranportiert und von einer Schneidewalze in y-Richtung (Querrichtung) nach jedem Carrée in kleinere Tablettenstreifen geschnitten, die in dem hier gezeigten Beispiel jeweils vier Tabletten 2 enthalten. Die angestrebte Sollposition für den Trennschnitt 5 liegt dabei in der Mitte des Quersiegelstegs 4, wobei eine Toleranz von ± 0,5 mm eingehalten werden sollte. Diese Anforderung konnte bisher in der betrieblichen Praxis nicht erfüllt werden. Erfolgt der Trennschritt am Rand oder sogar außerhalb der Siegelrandbreite b , so ist die luftdichte Verpackung und damit die vorgeschriebene Haltbarkeit der Tabletten nicht mehr gewährleistet.In the tablet carrier 1 shown in FIG. 1, each tablet 2 is in a square Sealed field (Carrée), that in the x-direction of longitudinal sealing bars 3 and in the y-direction is limited by cross sealing webs 4. The tablet carrier 1 consists of a two-layer aluminum composite film. When sealing is in each case a moisture-sensitive tablet 2 in a Carrée or a cell hermetically trapped tightly between the two layers. The sealing bars 3, 4 have one Width b of approx. 4 mm and are provided with a lattice-like embossing. Of the Tablet holder 1 is in the assembly operation in the x direction (longitudinal direction) transported and from a cutting roller in the y direction (transverse direction) each carrée cut into smaller tablets, the one shown here Example each contain four tablets 2. The desired target position for the separating cut 5 lies in the middle of the transverse sealing web 4, with a tolerance of ± 0.5 mm should be observed. So far, this requirement could only be Practice cannot be met. The separation step takes place on the edge or even outside the seal edge width b is the airtight packaging and thus the prescribed The durability of the tablets is no longer guaranteed.

Aus diesem Grund ist eine optische Meßeinrichtung in Form eines Reflexionssensors 6 vorgesehen, der die Oberfläche des Tablettenträgers 1 zwischen zwei Längssiegelstegen 3 mit einem Laserstrahl 7 abtastet. Der Reflexionssensor 6 erzeugt ein Wechselspannungssignal, dessen Auswertung die genaue Lage und Breite der Quersiegelstege 4 liefert. Aufgrund dieser Meßinformationen und Kontrolle der Stegkoordinaten kann dann eine genaue Positionierung des Trennschnitts in der Mitte jedes Quersiegelstegs 4 erfolgen, so daß die die Tablette einschließenden Siegelstege immer mindestens eine Siegelrandbreite von b/2 aufweisen und der hermetisch luftdichte Verschluß der Tabletten nicht mehr durch eine zu geringe Siegelrandbreite in Frage gestellt ist.For this reason, an optical measuring device in the form of a reflection sensor 6 provided that the surface of the tablet carrier 1 between two longitudinal sealing webs 3 scanned with a laser beam 7. The reflection sensor 6 generates an AC voltage signal, whose evaluation the exact position and width of the cross seal bars 4 supplies. Based on this measurement information and control of the web coordinates can then position the separating cut exactly in the middle of each cross seal 4 take place so that the sealing webs enclosing the tablet are always at least have a seal edge width of b / 2 and the hermetically airtight seal the tablets are no longer in question due to a too small sealing margin.

In Fig. 2 ist die Siegelmaschine und die nachgeschaltete, aus einer rotierenden Messerwalze bestehende Schneidvorrichtung in einer Seitenansicht dargestellt. Der Tablettenträger 1 wird von oben nach unten (x-Richtung) weitertranportiert. Die Siegelmaschine besteht aus zwei gegensinnig rotierenden Siegelwalzen 8 und 9 mit Siegelzonen 10 und 11, die gezahnte bzw. geriffelte Oberflächen 12 besitzen. Unter dem hohen Druck der aufeinander abrollenden Siegelzonen werden die dazwischen befindlichen beiden Folien 13 und 14 des Tablettenträgers 1 längs einer Zone b zwischen zwei aufeinanderfolgenden Tabletten 2 fest miteinander versiegelt. Dabei entsteht eine Siegelnaht bzw. der schon weiter oben beschriebene Siegelquersteg 4 mit der Breite b. Die geriffelten Oberflächen 12 der Siegelzonen 10, 11 erzeugen in der Siegelzone, d.h. auf der Oberfläche des Siegelquerstegs 4, die bereits erwähnte gitterförmige Prägung. Die gitterartige Prägung kann auch (bei entsprechender Gestaltung der Siegelzonen) aus einer Vielzahl von kleinen Vertiefungen bzw. Erhebungen bestehen.In Fig. 2 is the sealing machine and the downstream, from a rotating knife roller existing cutting device shown in a side view. Of the Tablet carrier 1 is transported from top to bottom (x direction). The sealing machine consists of two counter-rotating sealing rollers 8 and 9 with sealing zones 10 and 11, which have toothed or corrugated surfaces 12. Under the high pressure of the sealing zones rolling on one another becomes those in between two films 13 and 14 of the tablet carrier 1 along a zone b between two successive tablets 2 tightly sealed together. This creates one Sealing seam or the sealing crosspiece 4 with the width b already described above. The corrugated surfaces 12 of the sealing zones 10, 11 produce in the sealing zone, i.e. on the surface of the sealing crosspiece 4, the lattice-shaped embossing already mentioned. The lattice-like embossing can also (if the sealing zones are designed accordingly) consist of a large number of small depressions or elevations.

Die nachgeschaltete Schneidvorrichtung besteht aus der Messerwalze 15 mit den Querschneiden 16 und der feststehenden Gegenschneide 17. Der Tablettenträger 1 wird immer dann durchtrennt, wenn die Querschneide 16 an der Gegenschneide 17 vorbeiläuft. Die Differenz der Umlaufgeschwindigkeiten zwischen den rotierenden Siegelwalzen 8 und 9 und der rotierenden Messerwalze 15 muß infolgedessen so eingestellt werden, daß die Querschneide 16 immer dann an der Gegenschneide 17 vorbeiläuft, wenn die Mittellinie eines Siegelstegs 4 genau gegenüber der Gegenschneide 17 steht. In diesem Fall würde der Trennschnitt, wie oben beschrieben, genau in der Mitte des Siegelstegs erfolgen. Aufgrund von Längenschwankungen des Tablettenträgers, die auf starke mechanische Beanspruchungen während des Siegelprozesses zurückzuführen sind, kann aber die Lage des Quersiegelstegs 4 auf dem Tablettenträger in nicht vorhersehbarer Weise in x-Richtung verschoben sein, so daß bei einer starten Phasenverschiebung zwischen der Siegelmaschine 8, 9 und der Messerwalze 15 keine genaue Positionierung des Trennschnitts möglich ist.The downstream cutting device consists of the knife roller 15 with the Cross cutting 16 and the fixed shear bar 17. The tablet carrier 1 is always cut when the cutting edge 16 on the counter cutting edge 17th passes by. The difference in orbital speeds between the rotating ones Sealing rollers 8 and 9 and the rotating knife roller 15 must consequently be set in this way be that the cross cutting edge 16 always passes the counter cutting edge 17, if the center line of a sealing bar 4 is exactly opposite the shear bar 17 stands. In this case, the separating cut would be exactly as described above In the middle of the sealing bar. Due to fluctuations in the length of the tablet carrier, which can be attributed to strong mechanical loads during the sealing process are, but the location of the cross seal 4 on the tablet carrier be shifted in an unpredictable way in the x direction so that start at one No phase shift between the sealing machine 8, 9 and the knife roller 15 exact positioning of the separating cut is possible.

Zu diesem Zweck werden die Lage (d.i. die Ortskoordinate in x-Richtung) und Breite b jedes Quersiegelstegs 4 von dem Reflexionssensor 6 und einer damit verbundenen Auswerteschaltung erfaßt. Der Reflexionssensor 6 besteht hier aus einem nach dem Triangulationsprinzip arbeitenden, im Handel erhältlichen optoelektronischen Wegmeßsystem. Dabei wird von einer Laserdiode ein sehr feiner Lichtpunkt auf den Tablettenträger 1 bzw. auf den Quersiegelsteg 4 projiziert. Über eine Empfangsoptik wird dieser Lichtpunkt unter einem spitzen Winkel betrachtet und auf eine positionsempfindliche CCD-Zeile 18 (s. Fig.4) abgebildet. Die Meßsignale werden über einen schnellen Signalprozessor weiterverarbeitet und als Analogwerte ausgegeben, die den momentanen Abstandswerten zwischen dem Sensor 6 und dem auf der Oberfläche des Siegelstegs 4 in Längsrichtung wandernden Lichtpunkt entsprechen. Aufgrund der gitterartigen Prägung 19 (Fig. 4) des Siegelstegs wird dabei eine periodische Wechselspannung erzeugt, deren zeitlicher Verlauf in Fig. 3 dargestellt ist. Die Wechselspannung setzt ein, wenn der Laserstrahl 7 in den Stegbereich eintritt, und bricht ab, wenn der Laserstrahl den Stegbereich wieder verläßt. Da die Periode der Wechselspannung dem Gitterabstand der Prägungen entspricht, kann daraus sehr exakt die Lage und Breite und damit auch die Mitte b/2 des Siegelstegs bestimmt werden; d.h. der Sensor bzw. die Auswerteschaltung erkennt und lokalisiert die am Sensor vorbeilaufenden Quersiegelstege 4 und deren Mitte auf dem Tablettenträger 1. Zur Verbesserung des Meßsignal-Störabstandes können auch zwei Reflexionssensoren eingesetzt werden, wobei der eine Sensor die Oberseite und der andere Sensor die Unterseite des Tablettenträgers abtastet. Auf diese Weise können z.B. durch Flatterbewegungen des Tablettenträgers verursachte Störsignale eliminiert werden.For this purpose, the position (i.e. the location coordinate in the x-direction) and latitude b each cross seal web 4 by the reflection sensor 6 and an associated one Evaluation circuit detected. The reflection sensor 6 here consists of an after Triangulation principle working, commercially available optoelectronic position measuring system. A very fine point of light is emitted by a laser diode onto the tablet carrier 1 or projected onto the cross seal web 4. Via reception optics this point of light is viewed at an acute angle and is positioned sensitive CCD line 18 (see Fig. 4) shown. The measurement signals are over a fast signal processor processed and output as analog values, the the current distance values between the sensor 6 and that on the surface of the sealing web 4 correspond to the light point migrating in the longitudinal direction. Because of The lattice-like embossing 19 (FIG. 4) of the sealing web becomes a periodic one Generated AC voltage, the time course of which is shown in Fig. 3. The AC voltage sets in when the laser beam 7 enters the land area, and breaks off when the laser beam leaves the land area again. Since the period of AC voltage corresponds to the lattice spacing of the embossments, it can be very exactly determines the position and width and thus also the center b / 2 of the sealing bar will; i.e. the sensor or the evaluation circuit recognizes and localizes the am Sensor passing transverse sealing webs 4 and their center on the tablet carrier 1. Two reflection sensors can also be used to improve the measurement signal-to-noise ratio are used, one sensor the top and the other sensor the Scans the underside of the tablet carrier. In this way e.g. through fluttering movements interference signals caused by the tablet carrier are eliminated.

Das im Sensor 6 erzeugte, für die Prägung 19 charakteristische Wechelspannungsignal wird verstärkt (Verstärker 20) und anschließend einer Auswerteschaltung 21 zugeführt, die einen Steuerimpuls 22 erzeugt, der auf der Zeitachse der aktuellen Lage der Stegmitte des gerade vom Sensor 6 erfaßten Siegelstegs 4 entspricht (s. auch Fig. 2). Zur Steuerung bzw. Nachregelung der Messerwalze 15 wird nun ihre aktuelle Position, die durch einen mit ihr verbundenen Drehwinkelgeber ermittelt wird, mit der aktuellen Lage des Stegmittenimpulses 22 verglichen und durch Differenzbildung die Regelgröße für die Nachstellung des Messerwalzenmotors gebildet. In Abhängigkeit von der aktuellen Phasenlage des Stegmittenimpulses 22 wird dann die Umlaufgeschwindigkeit der Messerwalze 16 derart beschleunigt oder verzögert, daß die Querschneide 16 jeweils synchron mit der Mittelinie des Siegelstegs 4 an der feststehenden Gegenschneide 17 eintrifft. Auf diese Weise kann individuell bei jedem vorbeilaufenden Quersiegelsteg 4 eine genaue Positionierung des Trennschnitts in der Siegelstegmitte mit einer Toleranz von ± 0,5 mm und damit eine erhebliche Verbesserung im Hinblick auf die Zuverlässigkeit der luftdichten Verpackung und Haltbarkeit der Tabletten erreicht werden.The alternating voltage signal generated in the sensor 6, which is characteristic of the embossing 19 is amplified (amplifier 20) and then fed to an evaluation circuit 21, which generates a control pulse 22 which is on the time axis of the current position of the The middle of the web corresponds to the sealing web 4 just detected by the sensor 6 (see also FIG. 2). To control or readjust the knife roller 15, its current position, which is determined by an angle encoder connected to it with which current position of the web center pulse 22 compared and by forming the difference Control variable for the adjustment of the knife roller motor is formed. Dependent on the current speed then becomes the rotational speed from the current phase position of the web center pulse 22 the knife roller 16 accelerates or decelerates such that the cross cutting edge 16 each in synchronism with the center line of the sealing bar 4 on the fixed one Shear bar 17 arrives. This way, everyone can walk by individually Cross seal bar 4 an exact positioning of the separating cut in the middle of the seal bar with a tolerance of ± 0.5 mm and thus a significant improvement in With regard to the reliability of the airtight packaging and durability of the tablets can be achieved.

Claims (3)

Vorrichtung zum maßgenauen Schneiden eines streifenförmigen, in Längsrichtung taktförmig oder kontinuierlich weitertransportierten folienartigen Produktträgers (1) mit hintereinander angeordneten, luftdicht versiegelten Zellen, in denen empfindliche, feste, pastöse oder flüssige Produkte verpackt sind, bestehend aus einer rotierenden Messerwalze (15), die den Produktträger (1) jeweils im Bereich eines zwischen zwei Zellen befindlichen, quer zur Längsrichtung angeordneten und mit einer gitterartigen Prägung (19) versehenen Siegelstegs (4) durchtrennt, dadurch gekennzeichnet, daß zur Erkennung und Lokalisierung des Siegelstegs (4) oberhalb und/oder unterhalb des folienartigen Produktträgers (1) ein optischer Reflexionssensor (6) angeordnet ist, der ein der Gitterstruktur entsprechendes Wechselspannungssignal erzeugt, wenn der Siegelsteg (4) im Bereich des Reflexionssensors (6) liegt, wobei die Zahl der Perioden ein Maß für die Breite b des Siegelstegs (4) ist, und daß eine Auswerteschaltung (21) für das Wechselspannungssignal vorgesehen ist, die die Umlaufgeschwindigkeit der Messerwalze (15) derart steuert, daß der Trennschnitt in der Mitte (b/2) des Siegelstegs (4) erfolgt.Device for the accurate cutting of a strip-shaped, in the longitudinal direction cyclically or continuously transported film-like product carrier (1) with airtight sealed cells arranged one behind the other, in which sensitive, solid, pasty or liquid products are packaged from a rotating knife roller (15), each of the product carrier (1) in the area of one between two cells, transverse to the longitudinal direction arranged and provided with a lattice-like embossing (19) Severed web (4), characterized in that for detection and Localization of the sealing web (4) above and / or below the film-like An optical reflection sensor (6) is arranged on the product carrier (1), which generates an alternating voltage signal corresponding to the lattice structure, if the sealing web (4) is in the region of the reflection sensor (6), the Number of periods is a measure of the width b of the sealing web (4), and that an evaluation circuit (21) for the AC voltage signal is provided, which controls the rotational speed of the knife roller (15) such that the Cut in the middle (b / 2) of the sealing bar (4). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Reflexionssensor (6) aus einem nach dem Triangulationsprinzip arbeitenden optoelektronischen Wegmeßsystem besteht.Device according to claim 1, characterized in that the reflection sensor (6) from an optoelectronic operating according to the triangulation principle Position measuring system exists. Vorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Auswerteeinheit (21) einen für die meßtechnisch erfaßte Mitte des Quersiegelstegs (4) charakteristischen Steuerimpuls (22) erzeugt und in Abhängigkeit der zeitlichen Lage (Phasenlage) dieses Steuerimpulses (22) die Umdrehungsgeschwindigkeit der Messerwalze (15) verkleinert oder vergrößert wird.Device according to claims 1 and 2, characterized in that the Evaluation unit (21) for the center of the cross-sealing web, which is detected by measuring technology (4) characteristic control pulse (22) generated and depending on the temporal position (phase position) of this control pulse (22) the speed of rotation the knife roller (15) is reduced or enlarged.
EP97121053A 1996-12-13 1997-12-01 Device for cutting a strip-like package Expired - Lifetime EP0847926B1 (en)

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CN105517905A (en) * 2013-07-29 2016-04-20 佛克有限及两合公司 Methods and device for producing blanks for collars of packages for cigarettes
CN103481314A (en) * 2013-08-29 2014-01-01 安庆市恒昌机械制造有限责任公司 Raw material cutoff device used on production line of disposable sanitary product
CN103481314B (en) * 2013-08-29 2015-06-10 安庆市恒昌机械制造有限责任公司 Raw material cutoff device used on production line of disposable sanitary product
WO2017125377A1 (en) * 2016-01-18 2017-07-27 Tetra Laval Holdings & Finance S.A. A filling machine and a method for filling a package of a web of packaging material with a food product

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DE19651954A1 (en) 1998-06-18
DE59702140D1 (en) 2000-09-14
EP0847926B1 (en) 2000-08-09
US5957821A (en) 1999-09-28

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