WO2007003676A1

WO2007003676A1 - Method of obtaining a continuous mesh tube which is used to produce bags for vegetable and fruit products or similar products

Info

Publication number: WO2007003676A1
Application number: PCT/ES2006/000389
Authority: WO
Inventors: Juan Carlos De Clasca Cabre
Original assignee: Preformados Tubulares, S.L.
Priority date: 2005-07-06
Filing date: 2006-07-06
Publication date: 2007-01-11
Also published as: EP1908695B1; EP1908695A1

Abstract

The invention relates to a method of obtaining a continuous mesh tube which is used to produce bags for vegetable and fruit products or similar products. The invention also relates to the tube obtained using said method, which comprises four strips, namely two laminar strips and another two mesh strips which are disposed in alternating positions, partially overlapping each another along borders which are joined to one another. The tube also comprises four reinforcing bands which are disposed close to the free ends of each of the strips of mesh and which are glued to the inner face thereof and to the laminar strips.

Description

PROCEDURE FOR OBTAINING A CONTINUOUS TUBULAR

MESH FOR THE FORMATION OF PRODUCT BAGS

HORTOFRUTÍCOLAS AND SIMILAR.

FIELD OF THE INVENTION

The present invention relates to improvements introduced in the invention patent number 200102600 relative to a method for obtaining a continuous mesh tubular for forming bags for fruit and vegetable products and the like, especially applicable to obtaining a continuous tubular that alternately transversely webbed mesh bands with plastic bands and reinforcing ribbons located on the inner face of said tubular, which act, together with said laminar bands, as reinforcement and support for different types of graphic prints.

BACKGROUND OF THE INVENTION

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

The tubular obtained by the procedure described in the patent No. 200102600 is constituted from four longitudinal bands, two lateral mesh bands and two plastic lamellar bands, disposing each other in alternate positions being partially overlapped, specifically the bands being located laminar externally to the mesh side bands. The union between the laminar bands and the mesh sidebands was carried out by heat welding, this manufacturing process has the following disadvantages: the heat applied to the mentioned union causes that sometimes the laminar band is wrinkled and that the graphic impressions are deformed and the letters are illegible.

The procedure is limited to the use of certain materials for the mesh bands and the lamellar bands, since for the safe union of the materials to occur, it is necessary that both have similar melting points, and therefore it is not allowed The union of materials of different nature and melting point such as: polypropylene, polyethylene, paper, ... etc. The production speed of the tubular is quite slow since it is necessary to wait for the molten material to cool, to be able to manipulate the tubular without causing deformations.

The objective of the present improvements is to solve the exposed problems, making that the union between the laminar bands and the mesh side bands can be done by simple gluing, as well as by heat welding, for which the introduction of additional tapes located is necessary on the inner face of the free ends of the lateral mesh bands, whose main mission is to reinforce the union between the laminar bands and the mesh side bands.

DESCRIPTION OF THE INVENTION The present invention relates to improvements introduced in the invention patent No. 200201660 relative to a procedure for obtaining a continuous mesh tubular for forming bags for fruit and vegetable products and the like and tubular obtained by said method , whose tubular is constituted by four bands, two laminar and two other mesh, one and the other arranged in alternate positions, partially overlapping along strips that join together, additionally providing the aforementioned laminar bands four reinforcing tapes located in the vicinity of both free ends of each of the mesh bands, being attached to its inner face and to the laminar bands.

In this way it is achieved that there is no deformation of the lamellar bands since they do not have to be heated for joining to the mesh bands, different materials can be used in the manufacture of the tubular such as paper with polypropylene or polyethylene and in addition the tubular manufacturing speed. Said joining of the reinforcing tapes to the inner face of the mesh bands and to the laminar bands is preferably done by gluing. It can also be done by high frequency welding.

Thanks to the described configuration, a sandwich arrangement is defined in each of four the joints that exist in the tubular, formed by three layers a first layer constituted the end of the corresponding laminar band, an intermediate layer constituted by the end of the mesh band and a third layer constituted by the corresponding tape, said arrangement makes the bags constituted from the tubular defined in the present invention to be of great resistance and that a greater verticality or rigidity of the tubular is caused causing the storage of bags full of products be more secure and stable.

On the other hand, the placement of the reinforcing belts coinciding with the handle that incorporates each bag makes the fixing of said handles more solid than if they were only attached to the laminar bands, thus preventing the detachment of said handles during the transport of the bags and therefore that the transported product is damaged.

BRIEF DESCRIPTION OF THE DRAWINGS

The constitution, form of assembly and advantages improvements introduced in the invention patent No. 200102600 relating to a procedure for obtaining a continuous tubular mesh for forming bags for fruit and vegetable and similar products and tubular obtained by said process object of the present The invention is set forth in greater detail in the accompanying drawings, which help to better understand the invention and which expressly relate to embodiments of said invention which are presented as illustrative and non-limiting examples thereof.

Figure 1 shows a cross-sectional view of the tubular object of the present invention.

Figure 2 shows a schematic view, both in plan and lateral of the manufacturing facility of the tubular object of the present invention.

Figure 3 shows a schematic side view of the manufacturing installation of the tubular object of the present invention. DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

As can be seen in Figure 1, the continuous improved tubular mesh for the formation of bags for fruit and vegetable products object of the present invention, is constituted from four bands two 1-1 'laminar bands and two other mesh bands 2- 2 ', one and the other arranged in alternating positions, partially overlapping along strips that join together.

In addition to the four bands mentioned, the tubular has four reinforcing bands 3-3 'and 4-4', located in the vicinity of both free ends of the mesh bands, specifically the bands 3 and 3 'are located in the free ends of the mesh band 2 and the ribbons 4 and 4 'on the free ends of the mesh band 2', joining its inner face and at the same time to the laminar bands 1 - 1 \ Said laminar bands 1-1 'each one of them will be arranged above one of the free ends of the two mesh bands 2-2' by gluing, that is to say the laminar band 1 will be placed on the ends 5 and 6 of the mesh bands 2-2 'respectively and the laminar strip 1' will be placed on the ends 5 'and 6' of the mesh bands 2-2 'respectively, in Figure 1 the arrangement described can be clearly seen.

With the aforementioned arrangement, four joints are defined coinciding with the position of said reinforcement belts 3-3 'and 4-4', arranged longitudinally with respect to the tubular envelope. In each of the mentioned unions there will be a three-layer structure formed by a more external layer constituted by the ends of the laminar bands, by an intermediate layer constituted by the ends of the mesh bands and by a more internal layer constituted by the tapes of reinforcement.

In what refers to the manufacturing facility of the improved tubular, as can be seen in figures 2 and 3, we start from 2-2 'mesh bands which can be obtained in two ways, or from two bands which are folded in the form of "C" or from a closed mesh tubular which is cut into two equal portions defining two semi-tubular equally shaped "C". At the beginning of the installation, the mesh bands 2-2 'are embedded in a plate 7 that forms part of the bench, surrounding the edges of said plate in order to continue adopting its "C" shape, by its part of the reinforcing tapes 3 and 4 are initially placed on a second plate 8 of smaller width connected to the previous one so that they are located internally to the mesh bands, the tapes 3 and 4 are above said second plate 8 and the 3 'and 4' tapes are below it.

Subsequently, rollers 9-9 'are placed, at a certain distance from the bench, through which the laminar bands 1 and 1' pass respectively, at that moment four glue applicators, two of them 10 located above the tubular and two of them 10 'below it, apply glue on the inner face of the lamellar bands 1-1' respectively.

Then the tapes that initially ran outside the mesh bands, as seen in Figure 2, pass, thanks to two pairs of buttonholes 13-13 'practiced on the plate 7 (made in this case at 45 °) and represented in the figure by a break in the trajectory of said ribbons, to be located just below the innermost face of the mesh bands. (In order not to complicate the drawing, Figure 2 shows only a pair of tapes 3 and 4 with their corresponding eyelets parallel to 45 °). Each of the laminar bands 1-1 'are driven towards a pressure roller 11-11' respectively, by means of intermediate rollers 12-12 'that tension said laminar bands, said pressure rollers tighten to each laminar band, whose inner face is previously impregnated with glue, against the corresponding mesh band and in turn against the reinforcing tapes located below the free ends of each laminar mesh, achieving that the union reinforced by the mentioned tapes occurs, between the laminar bands and the free ends of the mesh bands I defend a closed tubular of great resistance, whose sides are normally extruded mesh and whose front are laminar band Ia which is capable of being printed with commercial and informative reasons.

The union achieved between the laminar and mesh bands is of great resistance, which is due to the fact that the mesh band is placed in a position intermediate between the corresponding laminar band and the reinforcing tape and due to its mesh structure the glue deposited on the laminar layer passes through the holes of the mesh band and manages to reach the tape, making it in a single step of Pressed, by means of the pressure rollers 11-11 ', the three layers are joined, defining a sandwich structure in which the mesh band layer is retained between the corresponding laminar band layer and the layer constituted by the reinforcing tape .

Claims

REMNDITIONS

1.- Improvements introduced in the invention patent n ° 200102600 relating to a procedure for obtaining a continuous mesh tubular for forming bags for fruit and vegetable products and the like and tubular obtained by means of said procedure, whose tubular is constituted by four bands, two lamellar bands (1-1 ') and two other mesh bands (2-2'), one and the other arranged in alternate positions, partially overlapping along strips that join together, characterized in that four bands are additionally arranged reinforcement (3-3 '

; 4-4 ') located in the vicinity of both free ends of each of the mesh bands (2-2'), being attached to its inner face and to the laminar bands (1 -1 ').

2. Improvements introduced in the invention patent No. 200102600 according to claim 1, characterized in that said union between the inner face and the lamellar bands is carried out by means of bonding.

3. Improvements introduced in the invention patent No. 200102600 according to claim 1, characterized in that said union between the inner face and the laminar bands is carried out by means of high frequency welding.