WO1993011050A1

WO1993011050A1 - Roll of plastic material for forming bags

Info

Publication number: WO1993011050A1
Application number: PCT/FR1992/001136
Authority: WO
Inventors: Thierry Roy
Original assignee: Thierry Roy
Priority date: 1991-12-04
Filing date: 1992-12-03
Publication date: 1993-06-10
Also published as: FR2684644A1; FR2684644B1

Abstract

Roll of plastic material for forming bags used in packaging products. The roll comprises an upper face (14) and a lower face (16), each region of the roll (A1, A2, A3) corresponding to a bag being separated from the following region by at least one seam (S1, S2, S3) between said two faces and by a precut line (D1, D2, D3) along said upper and lower faces and parallel to said seams, said upper face being further provided, adjacent to said precut line, with a gripping means (P1, P2, P3) disposed so that, by seizing said gripping means, the person can, initally, cut at least the upper face along the precut line, separating the upper face from the rest of the roll.

Description

ROLL IN PLASTIC MATERIAL FOR FORMING

BAGS

The present invention relates to a roll of plastic material for forming bags.

The rolls of plastic material for successively forming bags are well known. The roller is constituted by a sheath folded back on itself produced from a plastic film, this sheath thus defining an upper face and a lower face. Each zone of the roll intended to make a bag is separated from the following zone by successively a transverse weld and a precut produced in the two faces of the sheath. To take a bag, it suffices to separate the zone concerned from the rest of the roll by exerting a traction which makes it possible to cut the zone concerned according to the pre-cut line. We know that this solution has the advantage of being economical, but that from the portion or the area separated from the rest of the roll, it is difficult to separate the two open edges in order to fill the bag. This drawback is even more significant when it is a question of manually inserting objects inside the bag on a product packaging line.

To overcome this drawback, machines have already been proposed which make it possible, during the production of the roller formed by the sheath of plastic material, to cut out only on the upper face of the sheath. Thus, before the separation of the portion of the sheath intended to form the bag, it is possible to lift one of the edges of the bag and to introduce the objects to be packaged into the bag thus opened. On the one hand, machines which allow a complete cut to be made on only one of the faces of the sheath are relatively expensive and, on the other hand, they do not allow such a cut to be made on only one of the faces of the sheath when the width thereof is relatively large. However, when packaging products, it is often necessary to have a bag having a relatively large width.

REPLACEMENT SHEET An object of the present invention is to provide a roll of plastic material for forming bags which can have a large width and which nevertheless allows an easy opening of each part of the sheath or of the roller forming the bag to allow the introduction of the objects. before separating this part from the rest of the strip, moreover the roll must be obtainable with machines of the conventional type.

To achieve this goal, the plastic material roll for forming bags comprises at least a first upper face and a second lower face, each zone of the roll corresponding to a bag being separated from the next zone by at least one weld between said two faces. extending perpendicular to the length of said roll and it is characterized in that each zone corresponding to a bag is further separated from the neighboring zone by a pre-cut line of said upper and lower faces and parallel to said welds, said upper face being further provided, near said cutting line, with a gripping means arranged in such a way that, by grasping said gripping means, it is possible, at first, to cut at least said upper face along said cutting line by moving said upper face away from the rest of said roller.

It is understood that the roller according to the invention effectively achieves the desired goal. In fact, it only requires the production of a precut line over the entire width of the sheath forming the roller and on its two faces. This technique is therefore well known. It also requires the installation of a gripping means which is easily done as the roll is formed. It is also understood that, thanks to this arrangement and to the presence of the gripping means, it is possible to lift the upper face of the roller in the zone intended to form the bag, which causes it to be completely cut across its entire width of its face. upper without causing that of the lower face. . It is then possible to proceed conveniently to the introduction of the object into the

REPLACEMENT SHEET bag, then separate the bag from the rest of the roll by acting on the pre-cut line on the underside.

According to a first embodiment, the gripping means consists of a particular prior cutting of the upper face of the roller connected to the pre-cutting line. In this case, it is for example possible to introduce the finger into the partial cut to cause the lifting of the upper face and therefore the cutting of the latter.

According to a second embodiment of the invention, the gripping means consists of a tongue, part of which is fixed to the upper face of the roller and the rest of which is free relative to said face and can therefore be easily grasped.

Other characteristics and advantages of the present invention will appear more clearly on reading the following description of several embodiments of the invention given by way of nonlimiting examples. The description refers to the appended figures in which:

- Figure 1 is a simplified view of a portion of a roller for forming bags according to the invention and explaining the principle thereof;

- Figure 2 shows in perspective a portion of the roller to form a bag according to a first embodiment of the invention;

- Figure 3 shows this same portion of the roller according to the first embodiment of the invention, the bag being in the open position;

- Figure 4 shows in perspective a portion of the roller to form a bag according to a second embodiment of the invention; - Figure 5 shows the same portion of the roller according to the second embodiment, the portion forming the bag being open; and

- Figures 6 and 7 show alternative embodiments of the gripping tab. Referring first to Figure 1, we will explain the principle of the invention. The plastic material roll 10 is

REPLACEMENT SHEET formed by a sleeve-shaped sheath 12 produced using a film of plastic material. Each zone intended to form a bag is respectively referenced A1, A2, A3 ... and separated from the following zone by a weld line SI, S2, S3 .... connecting together the upper 14 and lower 16 faces of the sheath over its entire width. On the roller, the sheath 12 is therefore flattened. Two successive zones are also separated by pre-cut lines D1, D2, D3 arranged in parallel and close to the welds, the pre-cut lines being produced both in the upper face 14 and in the lower face 16 of the sheath. In addition, each portion of sheath A1, A2 .... is provided with a gripping means PI, P2, P3 symbolized by a circle in FIG. 1. This gripping means which will be explained later is secured to the single face upper 14 of the sheath and disposed near the corresponding pre-cutting line Dl, D2 .... In addition, the gripping means PI, P2, P3 are substantially arranged along the longitudinal axis XX 'of the roller.

Thanks to this arrangement, to open a bag and place objects inside, it is possible to act on the gripping member PI of the portion A1 while maintaining the portion A2 in position. By acting on the gripping means PI, the single upper face 14 of the portion A1 is raised, which causes the upper face 14 to be cut only according to the pre-cutting line Dl. Thus, the bag portion is open and this portion can be kept in the open position by means of gripping means PI, which allows easy introduction of the objects to be packaged. After the placement of these objects, it is easy, thanks to the precut line on the lower face 16, to completely separate the bag A1 from the rest of the strip. . Referring now to Figures 2 and 3, we will describe in more detail a first embodiment of the invention. In these figures, there is shown, for example, the area Al intended to form a first bag and the area A2 of the sheath 12. According to this preferred embodiment, the sheath 12 is not only constituted by an upper face 14 and a lower face 16 but also by folded portions 20 and 22 lateral which

REPLACEMENT SHEET connect the upper 14 and lower 16 faces on their side. These folded portions 20 and 22 constitute the equivalent of bellows, as best seen in FIG. 3. According to this first embodiment, the gripping member PI is constituted by a tongue 24 of which a part 26 is fixed , for example, by bonding to the upper face 14 of the portion Al, the rest 28 of the tongue being free. The tongue 24 is, as already indicated, preferably arranged along the longitudinal axis of the sheath 12 and in the immediate vicinity of the pre-cut line Dl. As best shown in Figure 3, when you want to introduce objects into the bag A1, the operator unrolls the roll of a length greater than that which corresponds to a bag. It then suffices for the operator to act on the free end 28 of the tongue 24 to lift the upper face 14 of the sheath and cause it to be cut as well as that of the bellows parts 20 and 22 relative to the rest of the sheath . This operation is facilitated if there is on the next portion A2 of the strip a strip for holding in place 30 which facilitates the cutting of the upper face and of the bellows according to the pre-cutting line, the lower face remaining uncut. When the objects have been placed in the bag, it suffices to complete the cutting according to the pre-cutting line of the lower face 16.

Preferably, the roll of plastic material is stored on a reel pivotally mounted on an axis and the part of the unwound roll rests on a horizontal surface.

Referring now to Figures 4 and 5, we will describe a second embodiment of the invention. This second embodiment differs from the first only by the production of the gripping means PI, P2 ... In this embodiment, the gripping means PI consists of a cutout 32 forming an orifice, for example in the form of tab. This cutting is partly limited by the pre-cutting line Dl. It is understood that thanks to the orifice 32, it is possible for the operator, for example by introducing the finger or any other suitable element, to partially lift the upper face 14 of the sheath 12, which gradually causes the cutting of the face

REPLACEMENT SHEET upper 14 and bellows 20 and 22 according to the pre-cut line Dl. On the other hand, the lower face 16 of the portion A1 remains integral with the rest of the sheath. As in the case of the first embodiment, the operation of cutting the upper face and therefore opening the bag can be facilitated by placing on the portion A2 near the weld SI a bar 30 held in abutment on this part of the sheath.

Figures 6 and 7 show alternative embodiments of the gripping tab. In the case of FIG. 6, the gripping tab 40 comprises two end portions 42 and 44 which are glued to the upper face 14 of the bag while being spaced from one another and a middle portion 46 which, , is not glued. The non-glued portion 46 forms a sort of loop which facilitates gripping. In the case of FIG. 7, the tongue 48 also comprises two end portions 50 and 52 fixed on the upper face 14 of the bag while being substantially contiguous.

The tongue 48 also includes a middle portion 54 which is folded in such a way that the two faces of the fold 54a and 54b facing each other are glued to one another.

These two embodiments are particularly well suited to the case where the tensile force which must be exerted on the tongue to cause the opening of the bag must be greater, in particular because of the material from which the plastic film is made.

There are many uses for such bag rolls. They can be used, as already indicated, to feed packaging lines with manual insertion of objects into each bag. They can also serve as a "trash" bag in order to facilitate for users the opening of the bag which is often, with the bags designed, difficult due to static electricity.

REPLACEMENT SHEET

Claims

1. Roll of plastic material for forming bags comprising at least a first upper face (14) and a second lower face (16), each zone of the roller (Al, A2, A3) corresponding to a bag being separated from the following zone by at least one weld (SI, S2, S3) between said two faces extending perpendicular to the length of said roll, characterized in that in addition each zone corresponding to a bag is separated from the neighboring zone by a precut line ( Dl, D2, D3) of said upper and lower faces and parallel to said welds, said upper face being further provided, near said cutting line, with a gripping means (PI, P2, P3) arranged in such a way that, by grasping said gripping means, it is possible, in a first step, to cut at least said upper face along said cutting line by separating said upper face from the rest of said roller.

2. Roller according to claim 1, characterized in that said roller further comprises, in the direction of its length, two folded side portions (20, 22) connected to said upper (14) and lower (16) faces to form bellows .

3. Roller according to any one of claims 1 and 2, characterized in that said gripping means (PI, P2, P3) consists of a partial cut (30) in said upper face (14) connected to said precut line ( Dl, D2, D3).

4. Roller according to claim 3, characterized in that said cutout defines an orifice (30) partially limited by the pre-cut line (Dl, D2, D3), said orifices being substantially arranged along the longitudinal axis (XX ') of said upper face (14).

5. Roller according to any one of claims 1 and 2, characterized in that said gripping means (PI, P2, P3) consists of a tongue (24) of which a part (26) is fixed on the upper face (14 ) of said roller and the rest of which (28) is free relative to said face and can therefore be easily grasped.

REPLACEMENT SHEET

6. Roller according to any one of claims 1 and 2, characterized in that said gripping means (PI, P2, P3) consists of a tongue (40) comprising two end portions (42, 44) integral with the upper face (14) of said roller, and a free middle portion (46).

7. Roller according to any one of claims 1 and 2, characterized in that said gripping means (PI, P2, P3) consists of a tongue (48) comprising two end portions (50, 52) integral with the upper face (14) of said roller and a folded middle portion (54), the two faces (54a, 54b) of which are integral with one another.

8. A method of packaging products using a roll according to any one of claims 1 to 7, characterized in that it comprises the following steps: - the roll is unwound over a length greater than the zone corresponding to a first bag;

- Maintaining the part of the roller corresponding to the area associated with the next bag;

- The upper face is cut according to said pre-cutting line by acting on said gripping means;

- Introducing the product inside said previously opened bag;

- Cutting said second face according to the precut line.

REPLACEMENT SHEET