EP2744721B1 - Plastic bag with printable inner face - Google Patents

Plastic bag with printable inner face Download PDF

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Publication number
EP2744721B1
EP2744721B1 EP13713738.6A EP13713738A EP2744721B1 EP 2744721 B1 EP2744721 B1 EP 2744721B1 EP 13713738 A EP13713738 A EP 13713738A EP 2744721 B1 EP2744721 B1 EP 2744721B1
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EP
European Patent Office
Prior art keywords
intermediate layer
polyethylene
plastics bag
film
seam
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Application number
EP13713738.6A
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German (de)
French (fr)
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EP2744721A1 (en
Inventor
Rudolf Haimerl
Thomas Rethschulte
Alfons Stahl
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.)
Bischof and Klein SE and Co KG
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Bischof and Klein SE and Co KG
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Publication date
Application filed by Bischof and Klein SE and Co KG filed Critical Bischof and Klein SE and Co KG
Priority to PL13713738T priority Critical patent/PL2744721T3/en
Priority to SI201330078T priority patent/SI2744721T1/en
Publication of EP2744721A1 publication Critical patent/EP2744721A1/en
Application granted granted Critical
Publication of EP2744721B1 publication Critical patent/EP2744721B1/en
Priority to HRP20151372TT priority patent/HRP20151372T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/004—Information or decoration elements, e.g. level indicators, detachable tabs or coupons

Definitions

  • the invention relates to a plastic bag according to the preamble of claim 1.
  • Plastic bags of this type are usually formed from sheets or pieces of flat films which obtain an at least partially closed bag shape by means of seams, in which films to be joined are brought to a softening temperature and then sealed together with pressure.
  • the low-melting polyethylene material which is formed as a uniform film (mono-film) or as a layered film with at least one exposed polyethylene layer.
  • the layer film also benefits from the good heat-sealability of the polyethylene if it is to be connected to one another by way of another layer film via the polyethylene layers.
  • polyethylene is inherently poorly printable material. If polyethylene mono-film or a polyethylene surface of a film layer to be printed, usually a pressure pretreatment with a corona treatment is provided. The changed surface is then easy to print, but more difficult to seal.
  • the object of the invention is hereafter, a seam formation by heat sealing in polyethylene films or laminated films with a polyethylene layer to improve and simplify, although these have changed in the seam area for better printability, poorly sealable surfaces, the concerns of machinability and the fast working cycle in the production of such plastic parts with cutting of the film and seam formation are to be considered.
  • this object is achieved by a plastic bag according to the preamble of claim 1, starting with the characterizing features of claim 1.
  • An intermediate layer of a non-modified in the surface (non-pretreated) polyethylene reduces the sealing problems of tikvorbehandelten and / or printed polyethylene surfaces considerably by the fact that now not two pressure-pretreated and / or printed surfaces must be superimposed and connected to each other Side of the seam connection is a regularly good sealable polyethylene for material pairing available.
  • the liner creates already by the introduction of additional material has an advantage in terms of the robustness of the films in the seam area, which are less susceptible to overstress even when subjected to the film material with greater heat, exposure time or pressing force of the sealing tools. This is especially true for foils minimized thickness of about 40 microns, which can now be even further reduced, so that despite additional film strip material can be saved.
  • the polyethylene of the intermediate layer have a crystallite melting point of less than 120 ° C.
  • the material of the intermediate layer has a relatively low melting point, in particular a lower melting point than the polyethylene material of the wall-forming film. The intermediate layer can then be melted on the surface responsible for seam formation all the more easily, especially since its heating must take place during heat sealing from the outside through the wall-forming film.
  • the intermediate layer is not the sealability of the fabric, but only the combination of sealing layer and tissue.
  • the production of films or fabrics is also not the production of plastic bags by heat sealing, folding, cutting and the like, in particular the machining, Zu fallende work step, but a previous stage.
  • the polyethylene of the liners with a melt index, the so-called MFR value, of more than 2 g / 10 min can be selected to facilitate seaming to the intermediate layer from both sides.
  • a material for the intermediate layer is preferably a polybutene into consideration.
  • the polyethylene film is specified for the walls to save material with a film thickness of at most 40 microns, while the liner receives a film thickness of about 40 microns.
  • significantly greater thicknesses can also be specified for the intermediate layer, wherein the material expenditure remains justifiable if the intermediate layer is reduced to the narrower region of the seam or seams to be produced.
  • a reduction of the intermediate layer to the requirements required for the sealing is advantageously taken into account with a strip shape in which the sealing strips are formed with a width which overlaps the width of the sealing seam.
  • the machine tolerances or working tolerances in the production will be taken into account in the first place.
  • the width of the sealing strips must be sufficiently specified beyond the sealing seam width.
  • an intermediate layer or a sealing strip in areas of plastic packaging which can often be used for shaping, fixing and stiffening seal seams obtained in the interior, can also be designed as a stiffening element as in bags from unproblematic sealable films in the DE 20 2008 008 471 U1 is shown.
  • a seam can advantageously be provided with a strong or wide sealing strip, both from a strength point of view and from a form stiffness point of view ,
  • a generally designated 1 plastic bag is known in its basic form and for example in the EP 2 361 842 A1 the present applicant - there with a particularly contoured cut seam on the handle bar - described.
  • the illustrated bag provides still open empty packaging for relatively lightweight products such as toilet paper rolls and similar pulp products, which are accordingly often supplied in large containers.
  • the bag accordingly comprises two large walls 2 and 3, which are connected on the underside by a dividing seam 4 which is readily loadable on the underside and which merge integrally with each other on one (transverse) side with a folded side fold wall, while an opening 6 is initially formed on the opposite side is left between an edge region 7 of the wall 2 and a projecting over the wall 2 stacking edge 8 with pin stacking holes 9 for stacking and for machine handling.
  • the empty bag is therefore to be filled from the opening 6 ago, where he is exposed there in particular by Aufsp Schwarzwerkmaschinemaschinee and also by the injected contents considerable loads.
  • the handle strip 10 is separated by a sealing seam 12 from a filling space 13 of the bag.
  • This sealing seam 12 extends to one side and on the two side fold halves of the side gusset wall 5 and to the other side to the end of the handle strip 10 and beyond this end on the edge region 7 of the wall 2, to connect there with the upper edge of the wall 3.
  • the edge region 7 of the wall 2 is brought together after filling for closing the opening 6 with a sealing seam with the stacking edge 8 and sealed to then on the sealing seam projecting edge regions, in particular the stacking edge 8, separate.
  • the present bag is made of a clear transparent polyethylene film produced on the inside a total pressure pretreatment and, at least in partial areas, has undergone printing.
  • the sealing strip 14 inserted between the walls 2, 3 to be joined together in the region of the sealing seam 12 avoids the difficult direct connection of two pressure-pretreated and / or printed insides and replaces them by two connections to be affixed to the sealing strip 14 on both sides with one side each of the non-pressure-pretreated sealing strip ,
  • the material of the sealing strip 14 is selected above all with regard to easy sealability. This includes a relation to the material of the remaining bag film lower melting point of at least less than 120 ° C. Also advantageous is the use of a special polyethylene in the form of a polybutene. Furthermore, the thickness of the inserted sealing strip can be greater than that of the walls 2 and 3, without contributing significantly to the cost of materials.
  • the sealing strip 14 can contribute to the stiffening of the area between the grip strip 10 and the filling space 13, in particular if it is stronger than the thickness of the walls 2 and 3. Since the area between the handle strip 10 and the remaining bag for the form of soap and Carrying capacity of the bag 1 has a key function, a gain in this area with the sealing strip 14 is particularly advantageous and even allows the wall thickness of the film material for the walls 2 and 3 under the meanwhile common wall thickness of about 40 microns still significantly in the direction of 30 microns to reduce.
  • the sealing strip 14 does not extend into the region of the inserted side gusset wall 5.
  • the free end area is insignificant for the load capacity and also for the protective function of the bag.
  • the remaining opening opens from the filling chamber only in the handle bar. It goes without saying, however, that the sealing strip can be carried out with the side fold open on one side. A perfect finish at this point can be achieved by having corresponding seal strip pieces, in between on both sides used the walls 2 and 3 and the respective adjacent gusseted halves, even there can provide a degree.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)

Description

Die Erfindung betrifft einen Kunststoffbeutel nach dem Oberbegriff des Anspruchs 1.The invention relates to a plastic bag according to the preamble of claim 1.

Kunststoffbeutel dieser Art werden üblicherweise aus Bahnen oder Stücken von Flachfolien gebildet, die eine zumindest teilweise geschlossene Beutelform mit Hilfe von Nähten erlangen, bei denen zu verbindende Folien auf eine Erweichungstemperatur gebracht werden und dann mit Druck zusammengesiegelt werden. Schon wegen der schnellen und einfachen Erwärmungen wird dabei im großen Maße von dem niedrig schmelzenden Polyethylen-Material Gebrauch gemacht, das als einheitliche Folie (Mono-Folie) oder als Schichtfolie mit zumindest einer offenliegenden Polyethylenschicht ausgebildet ist. Auch der Schichtfolie kommt die gute Heißsiegelbarkeit des Polyethylens zu Gute, wenn diese mit einer weiteren Schichtfolie über die Polyethylenschichten miteinander zu verbinden ist.Plastic bags of this type are usually formed from sheets or pieces of flat films which obtain an at least partially closed bag shape by means of seams, in which films to be joined are brought to a softening temperature and then sealed together with pressure. Already because of the quick and easy heating is made to a large extent by the low-melting polyethylene material, which is formed as a uniform film (mono-film) or as a layered film with at least one exposed polyethylene layer. The layer film also benefits from the good heat-sealability of the polyethylene if it is to be connected to one another by way of another layer film via the polyethylene layers.

Allerdings ist Polyethylen ein von Haus aus schlecht bedruckbares Material. Wenn Polyethylen-Mono-Folie oder eine Polyethylen-Oberfläche einer Schichtfolie bedruckt werden sollen, wird üblicherweise eine Druckvorbehandlung mit einer Koronabehandlung vorgesehen. Die so veränderte Oberfläche ist dann gut zu bedrucken, allerdings schwerer zu siegeln.However, polyethylene is inherently poorly printable material. If polyethylene mono-film or a polyethylene surface of a film layer to be printed, usually a pressure pretreatment with a corona treatment is provided. The changed surface is then easy to print, but more difficult to seal.

Der Wunsch, die Bedruckung von Verpackungsmaterial wie etwa den hier betrachteten Kunststoffbeuteln auf die Beutelinnenseite zu verlegen, um das Druckbild damit vor Abrieb, Kratzern oder Verschmutzungen bei der Auslieferung, Lagerung oder Aufbrauch der verpackten Ware zu schützen wird zunehmend größer. Überdies lässt sich mit einer klaren Kunststofffolie ein Glanzeffekt für das Druckbild erzielen, der sonst nur bei einem "Schöndruck" auf der Außenseite mit einem Lacküberzug zu erreichen ist. Ein Druck auf der Beutelinnenseite oder auch nur eine druckvorbereitende Oberflächenbehandlung der Innenseite schafft aber Probleme für die Nahtbildung der Beutelwände, die regelmäßig mit den Innenseite aufeinanderliegend gesiegelt werden.The desire to lay the printing of packaging material such as the plastic bags considered here on the inside of the bag to the printed image with it To protect against abrasion, scratches or dirt during the delivery, storage or consumption of the packaged goods is becoming increasingly greater. Moreover, with a clear plastic film, a gloss effect can be achieved for the printed image, which otherwise can only be achieved with a "fair print" on the outside with a lacquer coating. However, a pressure on the inside of the bag or just a pressure-preparing surface treatment of the inside creates problems for the seaming of the bag walls, which are regularly sealed with the inside superimposed.

Die Probleme beim Heißsiegeln druckvorbehandelter Polyethylen-Oberflächen treten insbesondere bei Siegelnähten in der Fläche auf, wenn also die Folie nicht durchtrennt werden soll. Randnähte werden als Trennnähte verlässlich ausgeführt, in dem die gesamte Folienstärke mit einem heißen Werkzeug durchtrennt wird. Eine etwaige Druckvorbehandlung ist bei Trennnähten unkritisch, da die Folien über die gesamte Stärke in den Siegelvorgang eingebunden sind. Kritischer ist die Verbindung mit einer Naht bei solchen Nähten, die in der Fläche verlaufen und die nur eine oberflächliche Verbindung der Folien erhalten sollen.The problems in heat-sealing pressure-pretreated polyethylene surfaces occur in particular in sealing seams in the area, so if the film is not to be severed. Edge seams are reliably executed as separating seams in which the entire film thickness is cut with a hot tool. Any pressure pre-treatment is not critical in the case of dividing seams, since the foils are integrated into the sealing process over the entire thickness. More critical is the connection with a seam at such seams, which run in the area and which should receive only a superficial connection of the films.

Diesem Problem wird herkömmlich damit Rechnung zu tragen versucht, dass die Nähte mit erhöhter Siegeltemperatur, verlängerter Siegeldauer, erhöhtem Druck und/oder wiederholt ausgeführt werden, wie sie etwa in der EP 2 324 992 A1 als mehrstufige Verschweißung erwähnt ist. Diese Maßnahmen sind allerdings durchaus kritisch hinsichtlich der notwendigen Einstellungen und könnten auch leicht die Folie thermisch durchschmelzen oder mechanisch überlasten. Insbesondere bei dünnen Folien und auch bei dünnen Schichten ergibt sich eine problematische Verarbeitung der Folien, wobei auch eine generelle Entwicklung der Verpackungsfolien zu immer geringen Wandstärken von beispielsweise etwa 40 µm zu beobachten ist. Dies ist eine Entwicklung, die im Sinne einer Materialersparnis und einer Reduzierung von Verpackungsabfall angestrebt wird, die Verarbeitung aber erschwert.This problem is conventionally taken into account that the seams with increased sealing temperature, extended sealing time, increased pressure and / or repeatedly performed, as in the EP 2 324 992 A1 is mentioned as a multi-stage welding. However, these measures are quite critical in terms of the necessary settings and could easily thermally melt through the film or mechanically overload. Especially at thin films and even with thin layers results in a problematic processing of the films, whereby a general development of the packaging films to always low wall thicknesses of, for example, about 40 microns is observed. This is a development which is aimed at saving material and reducing packaging waste, but makes processing more difficult.

Aufgabe der Erfindung ist es hiernach, eine Nahtbildung durch Heißsiegeln bei Polyethylen-Folien oder Schichtfolien mit einer Polyethylen-Schicht zu verbessern und zu vereinfachen, obgleich diese im Nahtbereich zur besseren Bedruckbarkeit veränderte, schlecht siegelfähige Oberflächen aufweisen, wobei die Belange der maschinellen Verarbeitbarkeit und der schnelle Arbeitstakt bei der Fertigung solcher Kunststoffteile mit Zuschnitt der Folie und Nahtbildung zu berücksichtigen sind.The object of the invention is hereafter, a seam formation by heat sealing in polyethylene films or laminated films with a polyethylene layer to improve and simplify, although these have changed in the seam area for better printability, poorly sealable surfaces, the concerns of machinability and the fast working cycle in the production of such plastic parts with cutting of the film and seam formation are to be considered.

Gemäß der Erfindung wird diese Aufgabe von einem Kunststoffbeutel nach dem Oberbegriff des Anspruchs 1 ausgehend mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.According to the invention, this object is achieved by a plastic bag according to the preamble of claim 1, starting with the characterizing features of claim 1.

Eine Zwischenlage aus einem in der Oberfläche nicht veränderten (nicht druckvorbehandelten) Polyethylen reduziert die Siegelprobleme von druckvorbehandelten und / oder bedruckten Polyethylenoberflächen schon dadurch erheblich, dass nunmehr nicht zwei druckvorbehandelte und / oder bedruckte Flächen aufeinanderliegen und miteinander verbunden werden müssen, sondern dass jeweils auf einer Seite der Nahtverbindung ein regelmäßig gut siegelfähiges Polyethylen für die Materialpaarung zur Verfügung steht. Darüberhinaus schafft die Zwischenlage schon durch das Einbringen zusätzlichen Materials einen Vorteil hinsichtlich der Robustheit der Folien im Nahtbereich, die auch bei Beaufschlagung des Folienmaterials mit größerer Hitze, Einwirkdauer oder Presskraft der Siegelwerkzeuge weniger anfällig gegen eine Überbeanspruchung sind. Dies gilt vor allem für Folien minimierter Stärke von bisher etwa 40 µm, die nunmehr sogar noch weiter reduziert werden kann, so dass trotz zusätzlichem Folienstreifen Material gespart werden kann.An intermediate layer of a non-modified in the surface (non-pretreated) polyethylene reduces the sealing problems of druckvorbehandelten and / or printed polyethylene surfaces considerably by the fact that now not two pressure-pretreated and / or printed surfaces must be superimposed and connected to each other Side of the seam connection is a regularly good sealable polyethylene for material pairing available. In addition, the liner creates already by the introduction of additional material has an advantage in terms of the robustness of the films in the seam area, which are less susceptible to overstress even when subjected to the film material with greater heat, exposure time or pressing force of the sealing tools. This is especially true for foils minimized thickness of about 40 microns, which can now be even further reduced, so that despite additional film strip material can be saved.

Vorteilhaft kann das Polyethylen der Zwischenlage einen Kristallitschmelzpunkt von unter 120 °C aufweisen. Insgesamt ist es vorteilhaft, wenn das Material der Zwischenlage einen relativ niedrigen Schmelzpunkt, insbesondere einen niedrigeren Schmelzpunkt als das Polyethylen-Material der wandbildenden Folie aufweist. Die Zwischenlage lässt sich dann an der für die Nahtbildung maßgeblichen Oberfläche umso leichter anschmelzen, zumal deren Erhitzung bei Heißsiegeln von außen durch die wandbildende Folie hindurch erfolgen muss.Advantageously, the polyethylene of the intermediate layer have a crystallite melting point of less than 120 ° C. Overall, it is advantageous if the material of the intermediate layer has a relatively low melting point, in particular a lower melting point than the polyethylene material of the wall-forming film. The intermediate layer can then be melted on the surface responsible for seam formation all the more easily, especially since its heating must take place during heat sealing from the outside through the wall-forming film.

Aus der EP 2 188 438 B1 ist zwar eine Zwischenschicht zur Verbindung einer Siegelschicht aus Polyethylen mit einer Gewebeschicht aus verstreckten Polymerbändchen zu entnehmen, jedoch dient die Zwischenschicht nicht der Siegelbarkeit des Gewebes, sondern nur der Verbindung von Siegelschicht und Gewebe. Die Fertigung von Folien oder Geweben ist auch keine der Fertigung von Kunststoffbeuteln durch Heißsiegeln, Falten, Schneiden und dergleichen, insbesondere der maschinellen Fertigung, zufallende Arbeitsstufe, sondern eine vorangehende Arbeitsstufe. Vorteilhaft kann das Polyethylen der Zwischenlagen mit einem Schmelzindex, dem sogenannten MFR-Wert, von mehr als 2 g/10 min ausgewählt werden, um die Nahtbildung gegenüber der Zwischenlage von beiden Seiten zu erleichtern.From the EP 2 188 438 B1 Although an intermediate layer for connecting a sealing layer made of polyethylene with a fabric layer of stretched polymer tapes to remove, but the intermediate layer is not the sealability of the fabric, but only the combination of sealing layer and tissue. The production of films or fabrics is also not the production of plastic bags by heat sealing, folding, cutting and the like, in particular the machining, Zufallende work step, but a previous stage. Advantageously, the polyethylene of the liners with a melt index, the so-called MFR value, of more than 2 g / 10 min can be selected to facilitate seaming to the intermediate layer from both sides.

Als Material für die Zwischenlage kommt vorzugsweise ein Polybuten in Betracht.As a material for the intermediate layer is preferably a polybutene into consideration.

Zur Verbindung von Folien und dergleichen sind Materialien, die etwa in geschmolzener Form als Kleber aufgetragen werden, sonst schon breithin bekannt. In der DE 72 28 831 U finden sich Überlapp-Längsnähte zur Schlauchbildung für Beutel, mit erhitzt extrudiertem Verbindungsmaterial gebildet. Auch die DE 2 263 624 A sieht den Auftrag von Verstärkungs- und Klebefäden für Randverstärkungen an Beuteln vor. Eine einsiegelbare Zwischenlage ist bei der Beutelfertigung regelmäßig einfacher zu verarbeiten als ein flüssiger Eintrag von Schmelzmaterial.For the connection of films and the like, materials which are applied as an adhesive in molten form, for example, are already widely known. In the DE 72 28 831 U There are overlap longitudinal seams for bagging tubing formed with heated extruded bonding material. Also the DE 2 263 624 A provides for the order of reinforcement and adhesive threads for edge reinforcements on bags. A sealable liner is usually easier to process during bag production than a liquid entry of melt material.

Vorzugsweise wird die Polyethylen-Folie für die Wände materialsparend mit einer Folienstärke von höchstens 40 µm vorgegeben, während die Zwischenlage eine Folienstärke von über 40 µm erhält. Unter dem Gesichtspunkt der leichten Siegelverarbeitung können auch für die Zwischenlage erheblich größere Stärken vorgegeben werden, wobei der Materialaufwand vertretbar bleibt, wenn die Zwischenlage auf den engeren Bereich der herzustellenden Naht bzw. Nähte reduziert ist.Preferably, the polyethylene film is specified for the walls to save material with a film thickness of at most 40 microns, while the liner receives a film thickness of about 40 microns. From the point of view of easy sealing processing, significantly greater thicknesses can also be specified for the intermediate layer, wherein the material expenditure remains justifiable if the intermediate layer is reduced to the narrower region of the seam or seams to be produced.

Einer Reduzierung der Zwischenlage auf den für die Versiegelung erforderlichen Bedarf ist mit einer Streifenform vorteilhaft Rechnung zu tragen, bei der die Siegelstreifen mit einer die Breite der Siegelnaht übergreifenden Breite ausgebildet sind. Für die übergreifende Breite wird dabei in erster Linie den Maschinentoleranzen bzw. Arbeitstoleranzen bei der Herstellung Rechnung zu tragen sein. Geringfügigen Verschiebungen zwischen den Siegelstreifen und der Folie bzw. den Aufsetzbereichen der Siegelwerkzeuge entsprechend ist die Breite der Siegelstreifen ausreichend über die Siegelnahtbreite hinaus vorzugeben.A reduction of the intermediate layer to the requirements required for the sealing is advantageously taken into account with a strip shape in which the sealing strips are formed with a width which overlaps the width of the sealing seam. For the overall width, the machine tolerances or working tolerances in the production will be taken into account in the first place. In accordance with slight displacements between the sealing strips and the film or the placement areas of the sealing tools, the width of the sealing strips must be sufficiently specified beyond the sealing seam width.

Daneben kann eine Zwischenlage bzw. ein Siegelstreifen in Bereichen einer Kunststoffverpackung, die oft zur Formgebung, Fixierung und auch zur Aussteifung Siegelnähte im Innenbereich erhalten können, auch als Versteifungselement ausgelegt werden wie es bei Beuteln aus unproblematisch siegelfähigen Folien etwa in der DE 20 2008 008 471 U1 dargestellt ist. Dies gilt insbesondere im Hinblick auf ein extrem dünnes Wandmaterial der Kunststoffbeutel mit einer entsprechend geringen Formhaltigkeit. So kann insbesondere eine Naht bei einem mit einem Griffbereich ausgestatteten Beutel, die den Bereich zwischen der Verpackung und dem Griff begrenzt und ihrerseits durchaus beim Befüllen und beim Handhaben belastet ist, sowohl unter Festigkeitsgesichtspunkten wie auch unter Formsteifigkeitsgesichtspunkten vorteilhaft mit einem starken oder breiten Siegelstreifen ausgestattet werden.In addition, an intermediate layer or a sealing strip in areas of plastic packaging, which can often be used for shaping, fixing and stiffening seal seams obtained in the interior, can also be designed as a stiffening element as in bags from unproblematic sealable films in the DE 20 2008 008 471 U1 is shown. This applies in particular with regard to an extremely thin wall material of the plastic bag with a correspondingly low dimensional stability. In particular, in the case of a pouch equipped with a grip area, which delimits the area between the packaging and the handle, and which in turn is thoroughly loaded during filling and handling, a seam can advantageously be provided with a strong or wide sealing strip, both from a strength point of view and from a form stiffness point of view ,

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher beschrieben. In Zeichnung zeigen in jeweils schematisierter Vereinfachung:

Fig. 1
eine Seitenansicht eines im Wesentlichen flach zusammengelegten Verpackungsbeutels mit einem Griffbereich und
Fig. 2
Schnitt nach Linie II-II in Fig. 1.
An embodiment of the invention is illustrated in the drawing and will be described in more detail below. In drawing show in a schematic simplification:
Fig. 1
a side view of a substantially flat folded packaging bag with a handle area and
Fig. 2
Section along line II-II in Fig. 1 ,

Ein insgesamt mit 1 bezeichneter Kunststoffbeutel ist in seiner Grundform bekannter Art und beispielsweise in der EP 2 361 842 A1 der vorliegenden Anmelderin - dort mit einer besonders konturierten Trennnaht an der Griffleiste - beschrieben. Der dargestellte Beutel stellt eine noch offene Leerverpackung für relativ leichte Produkte wie Toilettenpapierrollen und dergleichen Zellstofferzeugnisse da, die dementsprechend oft in großen Gebinden geliefert werden. Der Beutel umfasst dementsprechend zwei große Wände 2 und 3, die unterseitig durch eine von Haus aus gut belastbare Trennnaht 4 verbunden sind und an einer (Quer-)Seite zusammenhängend mit einer eingefalteten Seitenfaltenwand einstückig ineinander übergehen, während auf der gegenüberliegenden Seite zunächst eine Öffnung 6 belassen ist zwischen einem Randbereich 7 der Wand 2 und einem über die Wand 2 vorstehenden Stapelrand 8 mit Stiftstapellöchern 9 zum Stapeln und zur maschinellen Handhabung. Der Leerbeutel ist also von der Öffnung 6 her zu befüllen, wobei er dort insbesondere durch Aufspreizwerkzeuge und auch durch das eingeschossene Füllgut erheblichen Belastungen ausgesetzt ist.A generally designated 1 plastic bag is known in its basic form and for example in the EP 2 361 842 A1 the present applicant - there with a particularly contoured cut seam on the handle bar - described. The illustrated bag provides still open empty packaging for relatively lightweight products such as toilet paper rolls and similar pulp products, which are accordingly often supplied in large containers. The bag accordingly comprises two large walls 2 and 3, which are connected on the underside by a dividing seam 4 which is readily loadable on the underside and which merge integrally with each other on one (transverse) side with a folded side fold wall, while an opening 6 is initially formed on the opposite side is left between an edge region 7 of the wall 2 and a projecting over the wall 2 stacking edge 8 with pin stacking holes 9 for stacking and for machine handling. The empty bag is therefore to be filled from the opening 6 ago, where he is exposed there in particular by Aufspreizwerkzeuge and also by the injected contents considerable loads.

Der Beutel 1, der bei großen Abmessungen vorzugsweise im "Querformat" zu tragen ist, weist für diese Tragestellung längs einer Oberseite eine Griffleiste 10 mit einem als Ausstanzung / Ausschweißung gebildeten Griff 11 auf. Die Griffleiste 10 ist mit einer Siegelnaht 12 von einem Füllraum 13 des Beutels abgeteilt. Diese Siegelnaht 12 erstreckt sich zur einen Seite hin auch auf die beiden Seitenfaltenhälften der Seitenfaltenwand 5 und zur anderen Seite hin bis zum Ende der Griffleiste 10 und über dieses Ende hinaus auf den Randbereich 7 der Wand 2, um diese dort mit der Oberkante der Wand 3 zu verbinden. Der Randbereich 7 der Wand 2 wird nach dem Befüllen zum Verschließen der Öffnung 6 mit einer Siegelnaht mit dem Stapelrand 8 zusammengeführt und zusammengesiegelt, um dann über die Verschlussnaht überstehende Randbereiche, insbesondere den Stapelrand 8, abzutrennen.The bag 1, which is to be worn in large dimensions, preferably in the "landscape", has for this support position along an upper side a handle bar 10 with a handle 11 formed as a punched / welded. The handle strip 10 is separated by a sealing seam 12 from a filling space 13 of the bag. This sealing seam 12 extends to one side and on the two side fold halves of the side gusset wall 5 and to the other side to the end of the handle strip 10 and beyond this end on the edge region 7 of the wall 2, to connect there with the upper edge of the wall 3. The edge region 7 of the wall 2 is brought together after filling for closing the opening 6 with a sealing seam with the stacking edge 8 and sealed to then on the sealing seam projecting edge regions, in particular the stacking edge 8, separate.

Im Bereich der Siegelnaht 12 ist ein schmaler aber auch gegenüber Toleranzen für die Anbringung der Siegelnaht 12 in der Breite Sicherheit gewährender Siegelstreifen 14 zwischen die Wand 2 und die Wand 3 eingelegt. Die Siegelung erfolgt also nicht zwischen den Wänden 2 und 3 direkt sondern jeweils zwischen der einen und anderen Wand und dem Siegelstreifen 14. Dieser zusätzliche Siegelstreifen 14 dient der leichteren und verlässlicheren Anbringung der Siegelnaht 12. Der vorliegende Beutel ist aus einer klar durchsichtigen Polyethylen-Folie hergestellt, die auf der Innenseite insgesamt eine Druckvorbehandlung und, zumindest in Teilflächen, eine Bedruckung erfahren hat.In the area of the sealed seam 12, a narrow but also opposite to tolerances for the attachment of the sealing seam 12 in the width of security given sealing strips 14 between the wall 2 and the wall 3 is inserted. The seal is thus not between the walls 2 and 3 directly but in each case between the one and the other wall and the sealing strip 14. This additional sealing strip 14 is used for easier and more reliable attachment of the sealing seam 12. The present bag is made of a clear transparent polyethylene film produced on the inside a total pressure pretreatment and, at least in partial areas, has undergone printing.

Der zwischen die miteinander zu verbindenden Wände 2, 3 im Bereich der Siegelnaht 12 eingelegte Siegelstreifen 14 vermeidet die schwierige direkte Verbindung zweier druckvorbehandelter und / oder bedruckter Innenseiten und ersetzt diese durch zwei beidseitig an dem Siegelstreifen 14 anzubringende Verbindungen mit jeweils einer Seite des nicht druckvorbehandelten Siegelstreifens.The sealing strip 14 inserted between the walls 2, 3 to be joined together in the region of the sealing seam 12 avoids the difficult direct connection of two pressure-pretreated and / or printed insides and replaces them by two connections to be affixed to the sealing strip 14 on both sides with one side each of the non-pressure-pretreated sealing strip ,

Weiterhin ist das Material des Siegelstreifens 14 vor allem im Hinblick auf eine leichte Siegelbarkeit ausgewählt. Dazu gehört ein gegenüber dem Material der übrigen Beutelfolie niedrigerer Schmelzpunkt von jedenfalls weniger als 120 °C. Vorteilhaft ist dabei auch die Verwendung eines speziellen Polyethylens in Form eines Polybutens. Weiterhin kann die Stärke des eingelegten Siegelstreifens größer sein als die der Wände 2 und 3, ohne nennenswert zum Materialaufwand beizutragen.Furthermore, the material of the sealing strip 14 is selected above all with regard to easy sealability. This includes a relation to the material of the remaining bag film lower melting point of at least less than 120 ° C. Also advantageous is the use of a special polyethylene in the form of a polybutene. Furthermore, the thickness of the inserted sealing strip can be greater than that of the walls 2 and 3, without contributing significantly to the cost of materials.

Vor allem aber kann der Siegelstreifen 14 zur Versteifung des Bereichs zwischen der Griffleiste 10 und dem Füllraum 13 beitragen, insbesondere wenn er stärker ausgebildet ist als die Stärke der Wände 2 und 3. Da der Bereich zwischen Griffleiste 10 und dem übrigen Beutel für die Formseifigkeit und Tragfähigkeit des Beutels 1 eine Schlüsselfunktion hat, ist eine Verstärkung in diesem Bereich mit dem Siegelstreifen 14 besonders vorteilhaft und erlaubt es sogar, die Wandstärke des Folienmaterials für die Wände 2 und 3 unter das inzwischen gebräuchliche Wandstärkenmaß von etwa 40 µm noch deutlich in Richtung 30 µm zu reduzieren.Above all, however, the sealing strip 14 can contribute to the stiffening of the area between the grip strip 10 and the filling space 13, in particular if it is stronger than the thickness of the walls 2 and 3. Since the area between the handle strip 10 and the remaining bag for the form of soap and Carrying capacity of the bag 1 has a key function, a gain in this area with the sealing strip 14 is particularly advantageous and even allows the wall thickness of the film material for the walls 2 and 3 under the meanwhile common wall thickness of about 40 microns still significantly in the direction of 30 microns to reduce.

Gemäß der Darstellung in Fig. 1 erstreckt sich der Siegelstreifen 14 nicht bis in den Bereich der eingelegten Seitenfaltenwand 5. Der frei gelassene Endbereich ist für die Belastbarkeit und auch für die Schutzfunktion des Beutels unerheblich. Die verbleibende Öffnung mündet vom Füllraum nur in die Griffleiste ein. Es versteht sich allerdings, dass der Siegelstreifen durchgeführt werden kann, bei einseitig offener Seitenfalte. Ein vollkommener Abschluss an dieser Stelle kann dadurch erzielt werden , dass entsprechende Siegelstreifenstücke, innen zu beiden Seiten zwischen die Wände 2 bzw. 3 und die jeweils benachbarten Seitenfaltenhälften eingesetzt, auch dort einen Abschluss bieten können.As shown in Fig. 1 the sealing strip 14 does not extend into the region of the inserted side gusset wall 5. The free end area is insignificant for the load capacity and also for the protective function of the bag. The remaining opening opens from the filling chamber only in the handle bar. It goes without saying, however, that the sealing strip can be carried out with the side fold open on one side. A perfect finish at this point can be achieved by having corresponding seal strip pieces, in between on both sides used the walls 2 and 3 and the respective adjacent gusseted halves, even there can provide a degree.

Claims (8)

  1. Plastics bag (1) comprising at least two walls (2, 3) which are connected by means of seams (4, 12) and which are made of a polyethylene monofilm or a layered film having a polyethylene layer on the inside of the bag (1), the inside being modified by means of corona treatment or a similar pressure pretreatment of the surface for improved printability, characterised in that at least one seam is formed between the pressure-pretreated insides of the walls (2, 3) as a sealed seam (12) having an intermediate layer (14) as a film made of a polyolefin which is not modified in the surface and the melting point of which is not above that of the film of the plastics bag.
  2. Plastics bag according to claim 1, characterised in that the polyolefin of the intermediate layer (14) has a crystallite melting point of less than 120 °C.
  3. Plastics bag according to either claim 1 or claim 2, characterised in that the polyethylene of the intermediate layer (14) has a melt flow index (MFR value) of more than 2 g/10 min.
  4. Plastics bag according to claims 1, 2 or 3, characterised in that the intermediate layer (14) consists of a polyethylene, a polybutene or a polyethylene copolymer (e.g. EVA).
  5. Plastics bag according to any of claims 1 to 3, characterised in that the intermediate layer is designed as sealing tape (14) having a width which overlaps the width of the sealed seam (12).
  6. Plastics bag according to any of claims 1 to 5, characterised in that the intermediate layer (14) has a film thickness which is substantially greater than that of the film of the walls (2, 3).
  7. Plastics bag according to any of claims 1 to 6, characterised in that said plastics bag is formed to have a fill region (13) and a handle region (10) which are delimited from one another by a sealed seam (12) having an intermediate layer (14) sealed between the walls (2, 3).
  8. Plastics bag according to claim 7, characterised in that the intermediate layer (14) extends beyond the sealed seam (12) into the handle region (10) to the extent that it surrounds the handle (11).
EP13713738.6A 2012-04-05 2013-03-08 Plastic bag with printable inner face Active EP2744721B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL13713738T PL2744721T3 (en) 2012-04-05 2013-03-08 Plastic bag with printable inner face
SI201330078T SI2744721T1 (en) 2012-04-05 2013-03-08 Plastic bag with printable inner face
HRP20151372TT HRP20151372T1 (en) 2012-04-05 2015-12-14 Plastic bag with printable inner face

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202012003520U DE202012003520U1 (en) 2012-04-05 2012-04-05 Plastic bag with printable inside
PCT/EP2013/000681 WO2013149695A1 (en) 2012-04-05 2013-03-08 Plastic bag with printable inner face

Publications (2)

Publication Number Publication Date
EP2744721A1 EP2744721A1 (en) 2014-06-25
EP2744721B1 true EP2744721B1 (en) 2015-09-16

Family

ID=48045397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13713738.6A Active EP2744721B1 (en) 2012-04-05 2013-03-08 Plastic bag with printable inner face

Country Status (10)

Country Link
EP (1) EP2744721B1 (en)
DE (1) DE202012003520U1 (en)
DK (1) DK2744721T3 (en)
ES (1) ES2550235T3 (en)
HR (1) HRP20151372T1 (en)
HU (1) HUE026265T2 (en)
PL (1) PL2744721T3 (en)
RS (1) RS54255B1 (en)
SI (1) SI2744721T1 (en)
WO (1) WO2013149695A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7228831U (en) 1973-07-05 Windmoeller & Hoelscher Single or multi-layer sack or pouch made of heat-sealable material
DE2263624A1 (en) 1972-12-27 1974-07-04 Windmoeller & Hoelscher Heat-sealable bags - with extruded threads reinforcement
US4202450A (en) * 1979-02-06 1980-05-13 Twinpak Ltd. Flexible wall pouch with label
DE10054672A1 (en) * 2000-11-04 2002-05-08 Convenience Food Sys Bv Sealable multilayer film, used for bag packaging e.g. for food, has a combination of sealable layer and polypropylene base layer separated from another sealing layer of metallocene-polyethylene by a special layer sequence
US8227062B2 (en) * 2007-02-01 2012-07-24 Coating Excellence International Llc Package having a printed laminate
AT9823U1 (en) 2007-09-10 2008-04-15 Starlinger & Co Gmbh COATED FABRIC FROM MONOAXALLY SUPPRESSED PLASTIC BELTS AND SACK THEREFOR
DE202008008471U1 (en) 2008-06-26 2008-09-18 Rovema - Verpackungsmaschinen Gmbh Tubular bag for packaging a liquid
DE202009015448U1 (en) 2009-11-16 2011-03-31 Kunststoffwerk Bossel Gerd Knäpper GmbH & Co. KG bag packing
DE202010002916U1 (en) 2010-02-27 2011-08-02 Bischof Und Klein Gmbh & Co. Kg Pouch made of plastic film

Also Published As

Publication number Publication date
WO2013149695A1 (en) 2013-10-10
PL2744721T3 (en) 2016-01-29
ES2550235T3 (en) 2015-11-05
SI2744721T1 (en) 2015-11-30
DE202012003520U1 (en) 2013-07-08
DK2744721T3 (en) 2015-11-23
HUE026265T2 (en) 2016-06-28
HRP20151372T1 (en) 2016-01-15
EP2744721A1 (en) 2014-06-25
RS54255B1 (en) 2016-02-29

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