CH371735A

CH371735A - Bags and process for their manufacture

Info

Publication number: CH371735A
Application number: CH7424959A
Authority: CH
Inventors: Baehler Peter
Original assignee: Papro Ag Fuer Papierverarbeitu
Priority date: 1959-06-10
Filing date: 1959-06-10
Publication date: 1963-08-31

Description

  

  
 



  Beutel und Verfahren zu dessen Herstellung
Das Hauptpatent betrifft einen mit einem selbstschliessenden Füllventil versehenen Beutel und ein Verfahren zu dessen Herstellung. Kleinere Beutel dieser Art eignen sich besonders zur Aufnahme von Getränken. Ein gewisser Nachteil der Beutel gemäss Hauptpatent besteht darin, dass ihre Form in keiner Weise an die Form eines üblichen Gefässes für Getränke erinnert und dass sie auch keine Standfläche haben, mittels welcher sie in einer bestimmten Lage, vorzugsweise mit dem Ventil nach oben, auf einen Tisch gestellt werden können.



   Es ist das Ziel der Erfindung, einen Beutel zu schaffen, welcher auch diesen Wünschen gerecht wird. Die Erfindung zielt zugleich darauf hin, die Herstellung der Beutel trotz der zur Bildung einer brauchbaren Standfläche erforderlichen besonderen Bodenkonstruktion sehr einfach zu halten oder gegenüber Ausführungsformen gemäss Hauptpatent sogar noch zu vereinfachen.



   Das wird gemäss der Erfindung dadurch erreicht, dass der Beutel gleichartig ausgebildete   Ventil-und    Bodenteile aufweist. Die Herstellung eines solchen Beutels kann gemäss der Erfindung dadurch erfolgen, dass man einen   Materialsehlauch    an   gegenüberlie    genden Stellen mit einer einspringenden Falte versieht, hierauf den Schlauch in flachliegendem Zustand bei flachliegenden Falten quer zur Schlauchachse beidseitig bis an die Schlauchränder verbindet und damit gegenüberliegende, gleichartige, als   Ventnl-    teil bzw. Bodenteil verwendbare Taschen bildet.



   Die gleichartige Ausbildung der Ventil- und Bodenteile des Beutels bringt demnach keine erhebliche Komplikation der Fabrikation mit sich. Ausserdem kann unter Umständen ein beliebiger dieser Teile als   Boden-oder    Ventilteil benützt werden.



   In der Zeichnung ist ein Ausführungsbeispiel des erfindungsgemässen Beutels dargestellt.



   Fig. 1 zeigt das Ausgangsmaterial in perspekti  vischer    Darstellung;
Fig. 2 zeigt ein Fabrikationsstadium des Beutels;
Fig. 3 zeigt den gefüllten Beutel in perspektivischer Darstellung, und
Fig. 4 und 5 zeigen   Quer- bzw.    Längsschnitte durch den gefüllten Beutel.



   Zur Herstellung des Beutels wird von einem Ma  terialsehlauch    1 ausgegangen, welcher an gegenüberliegenden Stellen mit einspringenden Falten 40 versehen ist. Der so vorgeformte Schlauch wird dann flachgepresst, so dass die Falten 40 und die Seiten des Schlauches in gegenseitiger Berührung flach aufeinanderliegen. In diesem Zustand wird der Schlauch, welcher vorzugsweise aus. einem   {Weise    schweissbaren Material   besteht,    zwischen langgestreckten Schweisselektroden oder erhitzten Schweisstempein durchgefahrt, womit flache Schweisstellen 41 entstehen, welche den Schlauch über seine ganze Querausdehnung fest verbinden.

   Die Schweisstellen 41 sind gegenüber einer senkrechten zur Längsachse des Schlauches abwechslungsweise in entgegengesetztem Sinne leicht geneigt, so dass zwischen den Sohweisstellen trapezförmige Seitenteile 42 entstehen. An den Rändern des Schlauches entstehen zwischen den Schweisstellen 41 einspringende Taschen 43, die nach aussen geöffnet sind und eine schlitzartige Öffnung 44 bilden und welche innen von einer Zwischenwand 45 vom Innenraum des Beutels anfänglich vollständig getrennt sind. Die Taschen 43 weisen gleiche Tiefe auf, indem auch die Falten 40 von gleicher Tiefe gebildet worden sind. Nachdem die Schweisstellen 41 gemäss Fig. 2 erstellt worden sind, werden einzelne Beutel vom Schlauch abgetrennt, indem die Schweissstellen 41 längs ihrer strichpunktiert angedeuteten Mittellinien 46 zerschnitten werden.     



  
 



  Bags and process for their manufacture
The main patent relates to a bag provided with a self-closing filling valve and a method for its production. Smaller bags of this type are particularly suitable for holding drinks. A certain disadvantage of the bags according to the main patent is that their shape is in no way reminiscent of the shape of a conventional container for drinks and that they also have no standing surface by means of which they can be placed in a certain position, preferably with the valve upwards Table can be placed.



   It is the aim of the invention to create a bag which also meets these requirements. At the same time, the invention aims to keep the manufacture of the bags very simple, despite the special base construction required to form a usable floor space, or even to simplify it compared to embodiments according to the main patent.



   This is achieved according to the invention in that the bag has similarly designed valve and base parts. According to the invention, such a bag can be produced by providing a material tube with a re-entrant fold at opposite points, then connecting the tube in the flat state with flat folds transversely to the tube axis on both sides up to the tube edges and thus opposing, similar, Forms pockets which can be used as valve part or base part.



   The similar design of the valve and base parts of the bag therefore does not entail any significant manufacturing complications. In addition, under certain circumstances, any of these parts can be used as a base or valve part.



   The drawing shows an embodiment of the bag according to the invention.



   Fig. 1 shows the starting material in a perspective view;
Fig. 2 shows a manufacturing stage of the bag;
Fig. 3 shows the filled bag in a perspective view, and
4 and 5 show transverse and longitudinal sections, respectively, through the filled bag.



   To produce the bag, a material hose 1 is assumed which is provided with re-entrant folds 40 at opposite points. The tube preformed in this way is then pressed flat so that the folds 40 and the sides of the tube lie flat on one another in mutual contact. In this state, the hose, which is preferably made. a material that can be welded, is passed between elongated welding electrodes or heated welding stamps, creating flat welding points 41 which firmly connect the tube over its entire transverse extent.

   The welding points 41 are alternately slightly inclined in opposite directions with respect to a perpendicular to the longitudinal axis of the hose, so that trapezoidal side parts 42 arise between the welding points. At the edges of the tube, between the welds 41, there are recessed pockets 43 which are open to the outside and form a slot-like opening 44 and which are initially completely separated from the interior of the bag by an intermediate wall 45. The pockets 43 have the same depth in that the folds 40 have also been formed of the same depth. After the welding points 41 according to FIG. 2 have been created, individual bags are separated from the tube by cutting the welding points 41 along their center lines 46 indicated by dash-dotted lines.

Claims

The result is similar bags of a conical shape, the pocket 43 at the narrow end of the bag forming a valve part and the pocket 43 at the wide end of the bag forming a bottom part. To fill the bag, a filling pipe is pushed through the partition 45 in the manner already described in the main patent, whereby a valve opening 47 is formed in this partition according to FIGS. 4 and 5, through which the bag z. B. can be filled with a liquid. It is again essential that the bag is absolutely hermetically welded until it is filled, and therefore absolutely hygienic packaging of the contents is permitted even after long storage without special measures.

3 to 5, the filled bag can be placed with its further end on a flat surface, the wall 45 of the lower pocket 43 being pressed flat against the surface, as shown in particular in FIGS. 4 and 5, while the outer edges 48 of the bottom part are practically on the base with their entire circumference, so that externally the impression of an essentially truncated cone or bottle-like packaging is created.

The frustoconical design of the bag has two particular advantages. The bottom part is relatively large and wide and ensures good stability of the packaging even when using a soft, flexible material. On the other hand, with the conical shape, the pockets 43 must be of the same depth on both sides in order to achieve similar bags, but the depth of the bottom fold is limited by the desired deformation of the bottom part Valve part that ensures a good seal.

The ratio of the depth of the bottom fold 43 to the width of the flat bag at the further end should be approximately 14, so that a favorable deformation and good stability of the bottom part is achieved.

It would also be possible to make the bag relatively low and cylindrical or rectangular, and to achieve sufficient stability. In this case it would of course also be possible for the bottom fold and the valve fold to have different depths. Incidentally, that would also be possible if a conical bag were not produced by the method described with reference to FIG.

A particularly suitable material for producing the bag is PVC film or similar weldable plastic film. But it could also be more solid material, such. B. laminated material can also be used, which gives bags with a fairly large inherent stiffness. The edge parts can also be connected by gluing instead of welding.

PATENT CLAIMS I. Bag according to claim I of the main patent, characterized in that it has similarly designed valve and base parts.

II. The method according to patent claim II of the main patent for the production of the bag according to patent claim I above, characterized in that a material hose is provided with a re-entrant fold at opposite points, then the hose in the flat state with flat folds transversely to the tube axis on both sides up to the tube edges connects and thus forms opposing, similar pockets that can be used as a valve part or base part.

SUBCLAIMS 1. Bag according to claim I, characterized in that a valve or base part is provided at opposite points as pockets open to the outside.

2. Bag according to dependent claim 1, characterized in that both pockets have the same depth.

3. Bag according to dependent claim 1, characterized in that the bag has a conical shape, a valve part being provided on the narrow end and a bottom part being provided on the wide end of the bag.

4. Bag according to dependent claims 2 and 3.

5. The bag according to dependent claim 1, characterized in that it has folds re-entering at opposite points over the entire width, and that the bag sides are firmly connected to the outer fold edges over their entire length.

6. The method according to claim II, for the production of conical bags, characterized in that the connection points are produced alternately inclined in one sense or the other with respect to a perpendicular to the tube axis.