EP3708510A1 - Packing bag with facilitated recycling, and method for continuous production of a plurality of bags of this type - Google Patents

Abstract

The invention relates to a packaging bag (1) comprising an outer bag (2) comprising a front wall (2a) and a rear wall (2b), optionally connected by gussets (2c), a bottom (2d), and a filling opening (2e). According to the invention, the bag (1) comprises an inner bag (3) comprising at least a front wall (3a) and a rear wall (3b), optionally connected by bellows (3c) ), a bottom (3d), and a filling opening (3e), the inner (3) and outer (2) bags being attached to each other, at least at their opening (2e; 3e) filling, by temporary attachment means (5), the front (3a) and rear (3b) walls of the inner bag (3) are superimposed with the front (2a) and rear (2b) walls of the outer bag ( 2), and any gussets (2c; 3c) of the outer (2) and inner (3) bags are superimposed and nested in each other.

Description

TECHNICAL AREA

The invention relates to the technical sector of packaging bags, such as, for example, bags for packaging food products.

More particularly, the invention finds an advantageous application in the field of bags made of flexible material, in particular obtained from a strip of a film with a thickness of less than 250 μm, approximately.

The invention relates more particularly to a packaging bag of the aforementioned type, the recycling of which is facilitated, as well as to a method of continuously manufacturing a plurality of packaging bags of this type.

PRIOR ART

It is known from the prior art a packaging bag comprising a front wall and a rear wall, optionally connected by gussets, a bottom, and a filling opening.

This type of bag is generally produced continuously, from a plastic film, such as polyethylene, optionally complexed with other materials.

During its manufacture, and in a known manner, the plastic film is continuously subjected to successive folding and welding, or gluing, or other operations to produce the various constituent parts of the bag.

The disadvantage of the prior art lies mainly in the difficulty of recycling this type of packaging bag, while making it possible to meet other constraints, such as the conservation of the products packed in the bag, the visual commercial communication presents. on the outer walls of the bag, the filling, etc.

DISCLOSURE OF THE INVENTION

One of the aims of the invention is therefore to remedy the aforementioned problems by providing a packaging bag the recycling of which is facilitated, while making it possible to respond optimally to the constraints of the desired application.

To this end, a packaging bag has been developed comprising, in a known manner, an outer bag comprising a front wall and a rear wall, optionally connected by gussets, a bottom, and a filling opening.

According to the invention, the packaging bag also comprises an internal bag also comprising at least a front wall and a rear wall, optionally connected by gussets, a bottom, and a filling opening. The inner and outer bags are attached to each other, at least at their filling opening, by temporary attachment means. The front and rear walls of the inner bag are superimposed with the front and rear walls of the outer bag, and any gussets of the outer and inner bags are superimposed and nested within each other.

In this way, the inner bag can have characteristics and properties suitable for the desired application, while the outer bag can have other characteristics and properties to be used, for example, for commercial communication purposes, in particular by printing. of its outer surface.

It emerges from the above that after having used the bag, it is possible to detach the inner and outer bags in order to process and recycle them separately.

The inner and outer bags are attached to each other by any suitable technique and, for example, by gluing, spot welding, or spot lamination. The main thing is that a user, after use, can manually detach and separate the inner and outer bags from each other for separate recycling.

The inner and outer bags are attached to each other at least at their filling opening, but can also be attached to each other at their bottom, or at their front and rear walls, for example in their middle, on their borders, etc.

Depending on the desired application, the inner and outer bags can each be made from a single film, and can for example be made from identical or different materials. The inner and outer bags can also each be formed by a multilayer film, without departing from the scope of the invention.

Preferably, the outer and inner bags have flat bottoms. In this configuration and according to a particular embodiment, the bottoms of the outer and inner bags are folded together and glued to the front or rear wall of the outer bag, for example by means of an attached strip.

In this configuration, the added strip may include cutting or tearing means to release the folded bottoms and facilitate the separation of the inner and outer bags.

The invention also relates to a method of continuously manufacturing a plurality of such packaging bags, remarkable in that the packaging bags are produced continuously from a first strip of a film intended for forming the outer bags on which is positioned at least a second strip of a film intended to form the inner bags, the second strip being attached to the first strip with temporary attachment means positioned on areas of the first and second strips intended to be positioned at the level of the internal and external bag filling openings, the first and second strips then undergo successive folding, welding and cutting operations to form the packaging bags.

From this concept, several embodiments are possible.

For example, a single second strip is continuously unwound and positioned and tied onto the first strip.

In another embodiment, a plurality of second strips, in sheet form, are positioned and attached at regular intervals on the first strip, each sheet having an area corresponding to the desired area of an inner bag.

According to a particular technique, during the successive folding operations, the longitudinal edges of the second strip (s) are folded towards each other and fixed together, and the longitudinal edges of the first strip are folded back together. towards each other and secured together, to define the front and rear walls of the inner and outer bags.

In order to facilitate the operation of fixing the longitudinal edges of said first and second bands, the second band or bands are, for example, positioned on the first band with a lateral offset so as to facilitate the operation of fixing the longitudinal edges between them. of said first and second bands. In fact, during folding, one of the longitudinal edges of the second strip overlaps the opposite longitudinal edge, and one of the longitudinal edges of the first strip overlaps the opposite longitudinal edge.

Furthermore, to close the bottom of the inner and outer bags previously shaped and arranged one inside the other, the method comprises for example a step consisting in folding together the bottoms of the inner and outer bags and gluing them to the front wall. or rear of the outer bag, for example by means of an attached band.

DESCRIPTION OF FIGURES

• La figure 1 est une représentation illustrant, en perspective, un sac d'emballage selon l'invention ;
• La figure 2 est une représentation illustrant en détail les ouvertures des sacs interne et externe ;
• La figure 3 est une représentation illustrant le déroulement en continu des première et deuxième bandes, la deuxième bande étant attachée à la première bande avec un décalage latéral ;
• La figure 4 est une représentation schématique en perspective illustrant le déroulement en continu d'une première bande et le positionnement et la fixation d'une pluralité de deuxièmes bandes sous forme de feuilles sur la première bande, avec un décalage latéral ;
• La figure 5 est une représentation en perspective illustrant le repliage des bords longitudinaux des première et deuxième bandes, en chevauchement les uns sur les autres pour constituer le corps du sac ;
• La figure 6 est une représentation schématique en coupe longitudinale illustrant le repliage des fonds des sacs externe et interne en vue de les coller sur la paroi arrière du sac externe par l'intermédiaire d'une bande rapportée ;
• La figure 7 est une représentation schématique en perspective illustrant le sac d'emballage selon l'invention, dont le fond est refermé avec une bande rapportée.

Other advantages and characteristics of the invention will emerge better from the description which follows, given by way of non-limiting example, from the appended figures in which:

• The figure 1 is a representation illustrating, in perspective, a packaging bag according to the invention;
• The figure 2 is a view illustrating in detail the openings of the inner and outer bags;
• The figure 3 is a view illustrating the continuous unwinding of the first and second webs, the second web being attached to the first web with a lateral offset;
• The figure 4 is a schematic perspective view illustrating the continuous unwinding of a first web and the positioning and attachment of a plurality of second webs in sheet form to the first web, with lateral offset;
• The figure 5 is a perspective representation illustrating the folding of the longitudinal edges of the first and second strips, overlapping one another to constitute the body of the bag;
• The figure 6 is a schematic representation in longitudinal section illustrating the folding of the bottoms of the outer and inner bags with a view to gluing them to the rear wall of the outer bag by means of an attached strip;
• The figure 7 is a schematic perspective view illustrating the packaging bag according to the invention, the bottom of which is closed with an attached strip.

DETAILED DESCRIPTION OF THE INVENTION

With reference to figures 1 and 2 , the invention relates to a packaging bag (1) consisting of an outer bag (2) and an inner bag (3), attached to each other, at least at their opening (2e ; 3e) filling, by means (5) of temporary attachment.

Thus, after using the packing bag (1), the user can detach the inner bag (3) and easily process the outer (2) and inner (3) bags separately from each other with a view to their recycling.

More precisely, the internal (3) and external (2) bags are each made from a film, for example with a thickness less than 250 μm, and subjected to known and successive folding and welding operations, with a view to to form bags each comprising a front wall (2a; 3a) and a rear wall (2b; 3b) optionally connected by bellows (2c; 3c), a bottom (2d; 3d), and an opening (2e; 3e) ) filling.

The film constituting each of the inner (3) and outer (2) bags can be of any suitable type, depending on the desired application.

For example, the inner (3) and outer (2) bags are made of identical or different materials. Furthermore, the film constituting the inner (3) and outer (2) bags may be a multilayer film, or else a film consisting of a single layer.

The composition of the inner (3) and outer (2) bags depends on the desired application, and the constraints thereof, and is well known in the state of the art.

For example, the inner bag (3) can be a waterproof bag allowing a certain conservation of the products contained in the bag, while the outer bag (2) can be a bag, for example made of paper, allowing visual and commercial communication of the bag. packaging (1), and easy recycling.

The film which constitutes the internal (3) or external (2) bags may for example be made of polyethylene or polyethylene terephthalate, optionally complexed with polypropylene or any other material well known from the state of the art.

To attach the inner (3) and outer (2) bags to each other, it is possible to use an adhesive, glue, to make localized welding or lamination points.

These temporary attachment means (5) allow the user to be able, after use, to manually detach and separate the inner (3) and outer (2) bags from one another.

The temporary attachment means (5) can be positioned at all points of the front (2a; 3a) and rear (2b; 3b) walls, for example in their middle, at their edges, and also possibly at the bottom. (2d; 3d) of the inner (3) and outer (2) bags.

The invention also relates to a method of continuously manufacturing a plurality of packaging bags (1).

According to the method, the packaging bags (1) are produced continuously from a first strip (A) of a film, unwound continuously and intended to form the outer bags (2).

At least a second strip (B) of a film intended to form the internal bags is positioned and attached to the first strip (A) by the temporary attachment means (5).

This second band (B) is either unique, see figure 3 , or made up of a plurality of sheets, see figure 4 .

With reference to the figure 3 , and when the method uses a single second strip (B), the latter is unwound continuously and is superimposed on the first strip (A), in the same direction. Temporary attachment means (5) positioned on areas of the first and second bands (A, B) intended to be positioned at least at the level of the filling openings (3e, 2e) of the inner (3) and outer (2) bags ) join the two bands (A, B) to each other. These temporary attachment means (5) will allow the separation of the two bags (2, 3) while allowing optimal use of the packaging beforehand: such as filling, pouring, etc.

The first and second strips (A, B) then undergo successive folding, welding and cutting operations to form the packaging bags (1), with or without gussets (3c, 2c).

With reference to the figure 4 , and when the method uses second bands (B) in the form of a plurality of sheets, the latter is positioned and tied at regular intervals on the first band (A). Each sheet has an area corresponding to the desired area of the inner bag (3).

The inner (3) and outer (2) bags, of course of complementary and adjusted dimensions, can both include flat bottoms (2d; 3d).

With reference to the figure 5 , and during the successive folding operations, the longitudinal edges (B1, B2) of the second strip (s) are folded towards each other and fixed together, for example by welding or any other technique, and the longitudinal edges (A1, A2) of the first strip (A) are folded towards each other and fixed together, for example by welding or any other technique, to define the front (3a, 2a) and rear (3b) walls , 2b) internal (3) and external (4) bags.

To facilitate this operation, the first and second bands (A, B) can be positioned on top of each other with a lateral offset, see figures 3, 4 and 5 , so as to create areas of overlap between the longitudinal edges (A1, A2) and (B1, B2) of each strip (A, B).

After these operations, an inner bag (3) is obtained superimposed on the outer bag (2), with the gussets (2c; 3c) of the two bags nested one inside the other, where appropriate.

With reference to figures 6 and 7 , and to close the bottom (3d, 2d) of the inner (3) and outer (2) bags previously shaped and arranged one inside the other with the method implementing a single second strip (B), the method comprises a step of folding together the bottoms (3d, 2d) of the inner (3) and outer (2) bags and gluing them to the front (2a) or rear (2c) wall of the outer bag (2), for example by through an added band (C).

The attached strip (C) advantageously comprises means (6) for cutting or tearing, such as a precut line, a tab, etc. to release the folded bottoms (3d, 2d) and facilitate the separation of the bags. internal (3) and external (2).

In the configuration where the method uses a single second strip (B), unrolled continuously, the latter can be attached to the first strip (A) only at the level of zones intended to be positioned at the level of the filling openings ( 3e, 2e) of the inner (3) and outer (2) bags, since the bottoms (3d, 2d) of the bags can be closed by folding as mentioned above.

On the other hand, in the case where the method implements a plurality of second strips (B) in the form of sheets, the latter is attached to the first strip (A) on areas intended to be positioned at the level of the filling openings. (3rd, 2nd) of the inner (3) and outer (2) bags, and funds (3d, 2d).

Claims (13)

Packaging bag (1) comprising an outer bag (2) comprising a front wall (2a) and a rear wall (2b), optionally connected by gussets (2c), a bottom (2d), and an opening (2e) filling, characterized in that it comprises an internal bag (3) comprising at least a front wall (3a) and a rear wall (3b), optionally connected by bellows (3c), a bottom (3d), and a filling opening (3e), the inner (3) and outer (2) bags being attached to each other, at least at their filling opening (2e; 3e), by means (5) temporary attachment, the front (3a) and rear (3b) walls of the inner bag (3) are superimposed with the front (2a) and rear (2b) walls of the outer bag (2), and any gussets (2c; 3c) outer (2) and inner (3) bags are superimposed and nested within each other. Packaging bag (1) according to claim 1, characterized in that the inner (3) and outer (2) bags are attached to each other by adhesive, gluing, or spot welding. Packaging bag (1) according to one of the preceding claims, characterized in that the inner (3) and outer (2) bags are attached to each other at their front walls (2a; 3a) and rear (2b; 3b) and / or at their bottom (2d; 3d). Packaging bag (1) according to one of the preceding claims, characterized in that the inner (3) and outer (2) bags are made of different materials. Packaging bag (1) according to one of the preceding claims, characterized in that the outer (2) and inner (3) bags have flat bottoms (2d; 3d). Packaging bag (1) according to claim 5, characterized in that the bottoms (2d; 3d) of the outer (2) and inner (3) bags are folded together and glued to the front (2a) or rear (2b) wall. ) of the outer bag (2), preferably by means of an attached strip (C). Packaging bag (1) according to claim 6, characterized in that the attached strip (C) comprises means (6) for cutting or tearing to release the folded bottoms (2d; 3d) and to facilitate the separation of the internal bags. (3) and external (2). Process for the continuous manufacture of a plurality of packaging bags (1) according to claim 1, characterized in that the bags (1) are produced continuously from a first strip (A) of a film intended for forming the outer bags (2) on which is positioned at least a second strip (B) of a film intended to form the inner bags (3), the second strip (B) being attached to the first strip (A) with temporary attachment means (5) positioned on areas of the first and second bands (A, B) intended to be positioned at least at the level of the filling openings (3e, 2e) of the inner (3) and outer (2) bags ), the first and second strips (A, B) then undergo successive folding, welding and cutting operations to form the packaging bags (1). Method according to Claim 8, characterized in that a single second strip (B) is unwound continuously and positioned and tied on the first strip (A). Method according to Claim 8, characterized in that a plurality of second bands (B), in the form of sheets, are positioned and attached at regular intervals on the first strip (A), each sheet has an area corresponding to the desired area. an internal bag (3). Method according to one of claims 8 to 10, characterized in that , during the successive folding operations, the longitudinal edges (B1, B2) of the second strip (s) (B) are folded towards each other. 'other and fixed together, and the longitudinal edges (A1, A2) of the first strip (A) are folded towards each other and fixed together, to define the front (3a, 2a) and rear (3b, 2b) inner (3) and outer (2) bags. Method according to Claim 11, characterized in that the second strip (s) (B) are positioned on the first strip (A) with a lateral offset of so as to facilitate the operation of fixing the longitudinal edges (A1, A2 - B1, B2) between said first and second strips (A, B). Method according to claim 9, characterized in that , in order to close the bottom (3d, 2d) of the inner (3) and outer (2) bags previously shaped and arranged one inside the other, the method comprises a step consisting in fold together the bottoms (3d, 2d) of the inner (3) and outer (2) bags and glue them to the front (2a) or rear (2b) wall of the outer bag (2), preferably through d 'an added band (C).

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