FR2554785A1 - Method for producing a bag made from flexible synthetic material, with a rigid or semi-rigid handle - Google Patents

Abstract

Method for producing bag made from flexible synthetic material. A rigid or semi-rigid handle 2 is applied on the sheath 17 of film when the said sheath is on the mandrel 16 of the forming machine. Application: packaging of liquids.

Description

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The subject of the present invention is a process for the manufacture of a sachet made of flexible synthetic material, containing a liquid, provided with a means for holding and stiffening, said sachet being obtained from a cushion filled with liquid, said cushion itself being produced continuously from a sheath of synthetic film wound on a vertical mandrel. The invention also relates to a device for producing such a sachet, as well as the sachets obtained according to this method.

 Sachets obtained by essentially vertical tracking processes are in themselves well known. Most of them result in a simple cushion, closed by three side seals and filled with liquid, at some point in the process. The problem posed consists in giving this cushion a shape and a stability allowing its gripping and its use, in particular for the pouring of its contents.

 The devices proposed until now mostly use specific and complex welds and cutouts of the lower part of the intermediate cushion intended to be transformed into a bag.

 There is therefore a need for sachets obtained by a vertical tracking process which can be provided with effective and inexpensive gripping and stiffening means.

 In accordance with the invention, this result is obtained with a method for making a sachet of flexible synthetic material containing a liquid, provided with means for holding and stiffening, said sachet being obtained from a flexible cushion liquid, said cushion itself being produced continuously from a sheath of synthetic film wound on a vertical mandrel, characterized in that said gripping and stiffening means essentially consists of a rigid or semi-rigid handle attached to the sheath, when the latter is on the mandrel of the forming machine.

 According to an advantageous embodiment of the invention, the handle may be in the form of a rigid strip having multiple possible sections. The strip will be placed continuously on the sheath when the latter is on the forming mandrel of a vertical machine. Machines3: of this type are for example described in French patent 2071075. They will not be described in more detail.

 The method of the invention can be implemented either from a store for preparing and storing ready-to-use handles, or by a device integrated into the packaging machine and delivering the handles from a reel with formation and successive cutting of these.

These different methods will be explained below.

The invention will be better understood with the aid of the description below, given with reference to the appended drawings, given by way of nonlimiting example., In which
FIG. I is a perspective view of a cushion provided with a handle and in accordance with the invention,
FIGS. 2 a, 2b, 2c, 2d, 2e, 2f, 2g are sections according to A - A of the figure!, according to several variant embodiments,
FIG. 3 schematically recalls the process of vertical conformation of a sheath,
- Figure 4 is a cross-sectional view along
B - B at the level of the mandrel of the shaping machine, explaining the principle of the process of the invention,
- Figure 5 is a schematic representation of a first embodiment of the method of the invention, from a store containing the prepared handles.

FIG. 6 is a schematic representation of a second embodiment of the method of the invention, from a coil,
- Figure 7 illustrates a subsequent operational phase of strengthening the handle.

 We will first refer to Figure 1 which shows the cushion (I) provided with handles (2) that one seeks to obtain.

 I1 can then be optionally used as a sachet as it is or undergo subsequent treatments in particular to shape the upper corner (3) adequately as well as the lower corner (4) opposite the handle (2).

 The cushion (1) is made of a flexible synthetic material known per se.

 The handle (2) can indifferently, in all that follows, be of any composition, cardboard, plastic material, etc.

and any structure, wavy, solid, embossed, etc ...

The handle (2) can affect various sections
- flat (5), in Figure 2a
- enveloping at angles greater than 900 (6) in Figure 2b
- enveloping at right angles (7), in Figure 2c
- enveloping with right angles with folded edges (8),
figure 2 d
- central pinch (9) in Figure 2e
- flat with folded ends at right angles to
the exterior (10), in Figure 2f
- flat with folded ends inclined outwards
laughing (Il), in figure 2g
It will be understood that these sections are given simply by way of nonlimiting example.

 We recalled in Figure 3, the process of producing a tubular sheath intended to be filled with liquid and delivered in unit cushions.

 A film (12) fed continuously from a reel not shown, passes over a structure called a gooseneck, which allows to bring the two ends (13,14) of the film which are then welded, sel continuous line (15) around a vertical mandrel (16) to form a sheath (17).

 According to the invention, the handle (2) is applied at this stage continuously to the sheath (17) when the latter is still on the mandrel (16) which serves as a support.

 Advantageously, the mandrel will have a specific section adapted to each handle (2) which will have on its face opposite the sheath (17) an adequate adhesive or will be welded.

 According to the embodiment of Figure 5, the handles (2 ') prepared in advance are fed from a magazine (18) and applied by pressure on the sheath (17) by pressing on the mandrel (16). The handle is presented in the store ready to use, that is to say, cut, folded, formed.

 According to the embodiment of Figure 6, the handle (2 '') is formed by a device integrated in the packaging machine from a coil (19). Forming, cutting into individual handles, are carried out according to known methods in themselves. The installation is carried out as previously. Alternatively, the handle can be brought horizontally, instead of scrolling in the direction of advance of the sheath (17).

 At this stage, whether it is one or the other of the methods described, the configuration of FIG. 1 is obtained, with the possible variants for the handles.

 To further strengthen the handle, the upper corner can be folded down, after filling the cushion provided with its handle and welding the upper edge, as illustrated in FIG. 7. The handle being a rigid element, it then becomes possible to use it as a guide (reference) and support element.

To do this, the handle (2) is kept in jaws (20, 21) provided with grooves (22, 23). Then a piston (24) vertically moving presses the folded down cin (3) against the handle, said corner having been previously provided with a point of glue. In the case of compatible materials, the corner (3) and the handle (2) can be welded.

Claims (7)

CLAIMS. 1. Method for producing a flexible plastic bag containing a liquid, provided with a means for holding and stiffening, said bag being obtained from a flexible cushion of liquid, said cushion itself being produced continuously from a synthetic film sheath wound on a vertical mandrel, characterized in that said gripping and stiffening means essentially consists of a rigid or semi-rigid handle (2) attached to the sheath (17) when that -this is on the mandrel (16) of the forming machine. 2. Method according to claim 1, characterized in that the handles (2 ') are supplied from a store where they are arranged all prepared. 3. Method according to claim 1, characterized in that the handles (2 ") are produced on the packaging machine from a supply reel (19). 4. Method according to any one of claims 1 to 3, characterized in that the section of the mandrel (16) is adapted to the handle (2) to achieve an optimal application thereof on the sheath (17). 5. Method according to any one of claims 1 to 4, characterized in that the upper corner (3) of the cushion is folded over the handle (2).  6. Device for implementing the method according to any one of claims I to 5, characterized in that it essentially comprises a shaping and packaging machine with vertical routing, provided with a mandrel (16), a power supply in handles (2 '2 ") from a magazine (18) or from a reel (19) and means of application by pressure of the handles (2' 21 ') on the film sheath (17). 7. Device according to claim 6, characterized in that the wedge (3) is folded over the handle (2) by a piston (24) moving vertically, the handle (2) being held in jaws (20,21) provided with grooves (22,23).