ES2284340A1 - Continuous tube for the formation of bags that are intended for fruit and vegetable products - Google Patents

Abstract

The invention relates to a continuous tube for forming bags containing fruit and vegetable products, having at least one pair of mesh strips (1-1'), each of the mesh strips (1-1') being located once folded such that the edges defined by the mentioned folds (2-2') are opposite one another and separated a certain distance S each mesh strip (1-1) having a fold at both ends, end portions (3-4 3'-4') having width A being defined, B being the distance between the fold (2-2') and the free ends (5-6 5'-6') of a single strip a pair of laminar strips (7-7') having a width C equivalent to at least two times the distance B plus the distance S, and at least four reinforcing strips (8-9 8'-9') having a width less than the width A of the end portions (3-4 3'-4') of each of the mesh strips (1-1').

Description

Continuous tubular for bag formation Containers of fruit and vegetable products.

Field and object of the invention

The invention falls within the field of packaging of fruit and vegetable products such as potatoes or oranges and more specifically refers to a continuous tubular for the formation of container bags of the aforementioned products horticultural, which is constituted from bands of mesh, lamellar bands and reinforcement tapes which once joined together they define the continuous tubular.

State of the art

Different types are already known in the market of bags intended to contain such fruit and vegetable products like oranges, lemons, potatoes ... etc. which are constituted normally from a continuous tubular extruded mesh, which is filled with the aforementioned products and then I remain Closed in the packaging process.

The tubular obtained by the procedure described in patent No. 200102600 is constituted from four longitudinal bands, two side mesh bands and two plastic laminating strips, disposing each other in alternating positions being partially overlapping, specifically laminar bands being located externally to the bands mesh sides. The union between the laminar bands and the Mesh sidebands were made by heat welding, This manufacturing procedure has the following inconveniences:

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he heat applied to the aforementioned union causes the laminar band wrinkles and graphic prints deform and the letters are illegible.

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he procedure is limited to the use of certain materials for mesh bands and lamellar bands, because so that produce the safe union of the materials, it is necessary that both have similar melting points, and therefore the union of materials of different nature and melting point as for example: polypropylene, polyethylene, paper, ...etc.

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the tubular production speed is quite slow since there are  to wait for the molten material to cool, in order to handle the tubular without causing deformations.

The objective of the invention is to solve the exposed problems, causing the bond between the bands laminar and mesh sidebands are made using simple glued instead of by means of welded, for which it is the introduction of additional tapes located in the inner face of the free ends of the mesh bands lateral, whose main mission is to strengthen the union between laminar bands and mesh sidebands. Also about the lateral mesh bands from which the tubular folds are made inside the tubular that define two edges located next to each other and facing each other, and additionally a partial folding is carried out on the ends of the sides of the tubular.

This objective is achieved through the invention as defined in claim 1, in the dependent claims are defined preferred embodiments of the invention.

Description of the invention

The present invention relates to a tubular continuous for the formation of product container bags fruit and vegetable, which comprises at least one pair of mesh bands, a pair of laminar bands and at least four reinforcing tapes.

The mesh bands are preformed each with a central fold made on the smallest dimension of each mesh band following its largest dimension, being located each one of the mesh bands once folded in such a way that the edges defined by the aforementioned folds are faced between yes and separated a certain distance S, suffering each band of mesh at both ends a fold being defined portions ends of width A, where B is the distance between the fold and the free ends of the same band and the portions being located upper ends of each of the bands in a coplanar form and also the lower end portions thereof in a manner coplanaria according to two parallel planes separated a distance W.

The laminar bands have a width C equivalent to at least twice the distance B plus the distance S, each of the laminar bands being located respectively externally to each pair of coplanar end portions and of said mesh bands.

On the other hand the at least four tapes of reinforcement have a width less than the width A of the extreme portions of each of the mesh bands, being said reinforcing tapes arranged substantially parallel and coincident with said extreme portions, on the part free exterior not covered by the respective laminar bands, said reinforcing tapes being attached to the mesh bands and to turn to the laminar bands.

In this way, thanks to the configuration of the mesh bands which are folded and relative positioning between them, it is achieved that the introduction of reinforcement tapes be very simple put that they will always be outside the aforementioned bands mesh, avoiding that they have to be introduced inside the space delimited by mesh and laminar bands and so so much that it significantly increases the speed of manufacturing. Also thanks to the aforementioned folding of the mesh bands, you save a lot of space in the mesh band coils and it is allowed to work with very bellows small, even where its vertex does not reach the central axis longitudinal of the tubular, thus creating capacity bags very small as for the garlic packing.

One last advantage achieved thanks to folding prior to the mesh bands forming an inverted bellows is which ensures a perfect fit of the union of the bottom and mouth of the bag since having been wound an important time the mesh bands in folded position, reactivation of the shape by a memory effect of plastic.

On the other hand, providing the aforementioned bands of mesh of a fold at each of its ends to define extreme portions facilitates the bonding process between the bands of mesh and lamellar bands since the extreme portions remain  upper bands located on the same plane as well as the lower end portions and said planes parallel to the corresponding laminar bands, a more union is achieved intimate, resistant and secure between both types of bands and better finish of it.

Finally reinforcement tapes are used which are placed substantially parallel and coincidentally with said end portions, for the free outer part not covered by the respective laminar bands to define a sandwich arrangement in each of four the remaining joints defined in the continuous tubular, formed by three layers a first layer constituted the end of the web corresponding, an intermediate layer consisting of the portion corresponding end of the mesh band and a third layer constituted by the reinforcement tape, said arrangement makes the bags constituted from the tubular defined in the this invention is of great resistance and that a greater verticality or rigidity of the tubular causing the storage of bags full of products is safer and stable.

On the other hand, the placement of the tapes of reinforcement coinciding with the handle that incorporates each bag makes that the fixing of these handles be more solid than if they were joined only to the laminar bands, thus avoiding that there is detachment of said handles during the transport of the bags and therefore that the transported product is damaged.

As you can see in this first aspect of the invention contemplates the use of two mesh bands, in in this case the mesh bands used will normally be mesh extruded because due to its great resistance they allow the use of two mesh bands instead of a continuous tubular mesh.

In the case of using instead of mesh Extruded, woven mesh, it is necessary to have a tubular full mesh since the resistance of this type of mesh is much more limited than in the case of extruded mesh. By such reason and in a second aspect of the invention has been contemplated a continuous tubular that is characterized because the portions corresponding coplanar upper extremes each to a mesh band are joined together forming a base upper continuous and because the lower extreme portions each of them corresponding to a mesh band they are joined together forming a continuous bottom base, being defined a closed tubular mesh that has two side folds as a bellows, with bands available laminar externally to the upper and lower bases of said tubular mesh and four reinforcement straps located on the extreme portions by the free outer part of each tubular of mesh not covered by laminar bands, covering width A of said extreme portions.

The union of the reinforcement tapes with the set consisting of mesh bands and laminar bands It is made using thermo-adhesive substances.

This way you get that there is no deformation of the laminar bands when not having to heat them for its attachment to the mesh bands, whereby there is no deformation in the texts printed in the mentioned laminar bands and get the synchronization of the texts of both laminar bands of A simpler way. In addition, different tubular manufacturing materials such as paper with polypropylene or polyethylene since most materials withstand the low temperatures to which the joints are subjected during The heat welding stage.

By not having to heat the materials so much for your union, you don't have to wait just a while for them to cool to be able to manipulate them so that the tubular manufacturing speed.

Description of the drawings

Then it goes on to describe very brief a series of drawings that help to better understand the invention and that expressly relate to embodiments of said invention which are presented as illustrative examples and not Limitations of this one.

Figure 1 shows a sectional view of the continuous tubular object of the present invention, in a first mode of realization of the same in the case of mesh bands extruded

Figure 2 shows schematically, both in plant as in side view, of the manufacturing facility of the continuous tubular corresponding to the first embodiment of the invention.

Figure 3 shows a sectional view of the continuous tubular object of the present invention, in a second embodiment of the same in the case of a complete tubular woven mesh

Figure 4 shows schematically, both in plant as in side view, of the manufacturing facility of the continuous tubular corresponding to the second embodiment of the invention.

Description of embodiments of the invention

The continuous tubular for the formation of bags Containers of fruit and vegetable products object of this invention in a first embodiment thereof, as it can be seen in figure 1, it comprises at least a couple of 1.-1 'mesh bands which can come from a coil (not represented) already folded, each having a fold central 2-2 'made on the smaller dimension of each mesh band following its largest dimension. Each of the bands can be obtained from the previous division of a full tubular extruded mesh in two equal parts each one of which will constitute each of the mesh bands 1-1 '.

Once folded each of the mesh bands 1-1 ', are positioned so that the defined edges by the aforementioned folds 2-2 'are faced each other and separated a certain distance S, where B is the distance between the 2-2 'fold and the free ends 5-6; 5'-6 'of the same band of mesh.

Each 1-1 'mesh band in the proximities of each of its ends presents a folded, being defined, by the folding lines in each case, extreme portions 3-4; 3'-4 'of a width A.

The upper end portions 3-3 'of each of the bands are located of coplanar form and the lower end portions 4-4 'of them also in coplanar form, both planes in which the mentioned portions are found are they find a certain distance W apart, which is defined depending on the final dimensions we want to get from the bags or containers of fruit and vegetable products a package.

About couples of extreme portions coplanarians 3-3 'and 4-4' are located externally laminar bands 7 and 7 'respectively, the width of said laminar bands equivalent to at least the sum of twice the distance B plus the distance S of separation between the folds 2-2 'of the bands of 1-1 'mesh.

The overlap between the laminar bands 7-7 'and 1-1' mesh bands defines the continuous tubular, producing the union between both types of band only through the extreme portions 3-3 'and 4-4' by simple application of an adhesive, applying heat and pressure to the joint as later we will detail.

About the extreme portions 3-3 'and 4-4', on the outside free not covered by the respective laminar bands 7-7 ', reinforcement tapes are arranged 8-9 and 8'-9 'whose width is less than the width A of the mentioned end portions, such  reinforcing tapes are placed substantially parallel and coincident with said end portions 3-4 and 3'-4 '.

Regarding the installation of Improved tubular fabrication, as seen in Figure 2, be part of 1-1 'mesh bands left embedded in 11-11 'plates that are attached jointly and severally to the installation bench, being located each of the mesh bands internally to said plates 11-11 'and surrounding them so that the edges defined by the 2-2 'folds of the Mesh bands face each other.

On the other hand the reinforcement tapes 8-9, in the initial area of the installation, are located  respectively one above and the other below plate 11, while the other two reinforcement tapes 8'-9 ' They are placed one above and one below the plate 11 '.

Later they are placed two rollers 12-12 ', one above and one below the bench, at a certain distance from it, through which the laminar bands 7 and 7 'respectively, at that time several glue applicators, two of them 13, located above the tubular and two of them 13 'below it, apply glue on the inner face of laminar bands 7-7 ' respectively.

Next the tapes that a beginning they ran outside the mesh bands, as seen in the Figure 2, pass, thanks to two eyelets 14-14 ' practiced on plates 11 and 11 'respectively and represented in the figure by a break in the trajectory of the aforementioned tapes, to be located just below the face more Internal mesh bands.

Each of the laminar bands 7-7 'are driven towards pressure rollers 15-15 'respectively, by rollers 16-16 'intermediate tensioning said bands laminar, said pressure rollers 15-15 ' they squeeze each laminar band, whose inner face is impregnated pre-glue through the glue applicators, against the corresponding 1-1 'mesh band and its time against reinforcement tapes 8-9; 8'-9 'located below the extreme portions 3-3 'and 4-4' of each laminar mesh, getting the union reinforced by those mentioned tapes, between the laminar bands and the mentioned portions ends of the mesh bands defending a large closed tubular resistance, whose sides are extruded mesh and whose front are laminar band which is likely to be printed with commercial and informative reasons.

The union achieved between the laminar bands 7-7 'and 1-1' mesh bands is high strength which is because the mesh band is located in an intermediate position between the corresponding band laminar and reinforcing tape and due to its mesh structure the glue deposited on the laminar layer passes through the mesh band holes and get to the tape, making that in a single pressing step, using the pressure rollers 11-11 ', the three layers are united, defining a sandwich structure in which the mesh band layer is retained between the corresponding layer of laminar strip and the layer consisting of the reinforcement tape.

In a second embodiment of the invention, represented in Figure 3, the mesh used will be woven and instead of two mesh bands a full or closed tubular mesh will be used, for this purpose the upper end portions 3-3 ' each of them corresponding to a 1-1 'mesh band will be joined together forming a continuous upper base 10 and in turn the lower end portions 4-4' each corresponding to a mesh 1- band 1 'will be joined together forming a continuous bottom 10' continuous, said continuity defines a closed tubular mesh, which, as in the case of the extorted mesh, has two 2-2 'side folds as a bellows, arranged as in the previous case, laminar bands 7-7 'externally to the upper 10 and lower 10' bases of said tubular of
mesh.

The main reason for using a tubular Full mesh in the case of woven meshes is that the resistance to their breakage is much lower than the meshes extruded so it is necessary to preserve the continuity of the initial tubular being reinforced on two of its faces by the union of the lamellar bands and further reinforced by the addition of the reinforcing tapes that make the bags obtained from of the tubular are of great resistance.

For the second embodiment of the invention, a slightly different installation than the one used in the previous case will be used. Since it is part of a continuous mesh material it is necessary to define the shape of the double bellows determined by the folds 2-2 'from the beginning of the installation for which it is necessary to use a pair of initial plates 17-17' to which two plates 18-18 'perpendicular to each of the plates 17-17' are attached respectively, from whose plates 18-18 'two pairs of tensioners that materialize in bars 19-20, 19'-20' will depart. The plates 17, 18 and the bars 19 and 20 are joined together and define an upper body for holding the tubular which is responsible for holding the upper base 10 of the mesh tube, while the plates 17 ', 18' and the bars 19 'and 20' are joined together and define a lower tubular holding body that is responsible for holding the lower base 10 'of the mesh tubular. Both upper and lower bodies are separated a certain distance in order to allow the mesh tubular to run between
they.

To define the 2-2 'folds, in an intermediate position between the aforementioned upper bodies and lower clamp of the tubular are arranged third plates 21 and 22 coplanar and separated from each other a certain distance coinciding with the distance S of separation between the folds 2-2 'of the mesh. 2-2 'folds will be defined by the passage of the sides of the tubular through the space between plates 21 and 22.

In the same way the installation will have means to get the tubular from a shrunk state to a tensioned or stretched state forcing the tubular to pass through the outside of the bars 19-20, 19'-20 'as seen in Figure 4.

Claims (5)

1. Continuous tubular for bag formation Containers of fruit and vegetable products, comprising:

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 to the minus a pair of mesh bands (1-1 '), preformed each with a central fold (2-2 ') made on the smaller dimension of each mesh band following its larger dimension, each of the mesh bands being located (1-1 ') once folded in such a way that the edges defined by the mentioned folds (2-2 ') they face each other and separate a certain distance S, suffering each mesh band (1-1 ') in both ends a fold being defined extreme portions (3-4; 3'-4 ') of width A, where B the distance between the fold (2-2 ') and the ends free (5-6; 5'-6 ') of the same band and the upper end portions being located (3-3 ') of each of the bands coplanar and also the lower end portions (4-4 ') of them in a coplanar way according to two parallel planes separated a distance W,

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 a pair of laminar bands (7-7 ') of a width C equivalent to at least twice the distance B plus the distance S, each of the laminar bands being located respectively (7-7 ') outwardly to each pair of portions coplanar extremes (3-3 ') and (4-4') of said mesh bands (1-1 '), and

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to the minus four reinforcement tapes (8-9; 8'-9 ') of a width less than the width A of the extreme portions (3-4; 3'-4 ') of each of the mesh bands (1-1 '), being said reinforcing tapes arranged (8-9; 8'-9 ') substantially parallel and coincident with said end portions (3-4; 3'- 4 '), on the free outer part not covered by the respective laminar bands (7-7 '), said tapes being reinforcement (8-9; 8'-9 ') attached to the mesh bands (1-1 ') and in turn to the bands laminar (7-7 ').

2. Continuous tubular according to claim 1, characterized in that the upper end portions (3-3 ') coplanar each corresponding to a mesh band (1-1') are joined together forming a continuous upper base (10) and because the lower end portions (4-4 ') coplanar each corresponding to a mesh band (1-1') are joined together forming a continuous lower base (10 '), being defined a closed tubular mesh which has two lateral folds (2-2 ') as a bellows, laminar bands (7-7') being arranged externally to the upper and lower bases of said tubular mesh and four reinforcing bands (8-9; 8 '-9') located on the end portions (3-4; 3'-4 ') by the free outer part of each mesh tubular (1-1') not covered by the laminar bands (7-7 '), covering the width A of said end portions (3-4; 3'-4 '). 3. Continuous tubular according to claim 1, characterized in that the mesh bands (1-1 ') are constituted of extruded mesh. 4. Continuous tubular according to claim 2, characterized in that the mesh bands (1-1 ') are constituted of woven mesh. 5. Continuous tubular according to any one of claims 1 to 4 characterized in that the joining of the reinforcement tapes with the assembly consisting of the mesh bands and the lamellar bands is carried out by means of thermo-adhesive substances.