ES2481669T3 - Bag for fruit and vegetable products - Google Patents

Abstract

The bag of the invention is of the type constituted by a continuous band that closes on itself by a longitudinal welding line, defining a fragmentary tubular body in modules corresponding to respective bags, in which in said continuous band longitudinal strips participate of closed plastic, alternated with longitudinal strips of mesh, which are superimposed by their marginal zones for union between them. The invention focuses on the fact that while the closed plastic strips are made of polyethylene, the mesh strips are made of bi-oriented polypropylene, incorporating the continuous band in correspondence with each overlapping line between the aforementioned strips, a narrow strip also of polyethylene, adapted to the polypropylene mesh, which welds with the aforementioned longitudinal and wider strips of polyethylene through the holes of the mesh, fixing the latter. In this way, a smaller quantity of raw material is required for the construction of the bag.

Description

E09845741

07-15-2014

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DESCRIPTION

Bag for fruit and vegetable products.

OBJECT OF THE INVENTION

The present invention relates to a bag of the type used for packaging and marketing of fruit and vegetable products, such as citrus fruits, potatoes, etc., although said bag is usable in any other field where similar benefits are required.

The object of the invention is to obtain a bag that, offering adequate performance from the point of view of mechanical resistance, requires for its construction a smaller amount of raw material, with the consequent and beneficial impact that this has from the point of view economic.

BACKGROUND OF THE INVENTION

Certain types of fruit and vegetable products, such as potatoes, have long been commercialized in plastic bags of reticular structure, which allow both aeration and direct visualization of the product. Sometimes and to obtain these bags, it starts from a tubular mesh body that closes at both ends after the product is housed inside, and one of these handles ends can be provided that facilitate manual transport after acquisition by the consumer.

On other occasions a continuous, laminar band is used, which closes on itself to configure said tubular body, through a longitudinal welding line, after which the process mentioned above is repeated.

The problem common to all these types of bag, focuses on the fact that this mesh body is unable to receive printed information, which is essential in the vast majority of cases, since the brand itself needs to establish the brand of the product, its characteristics, barcode, etc.

A solution to this problem is that shown by Utility Model U 9701734, which the applicant himself owns, and which consists of using a continuous, structured band based on a strip or intermediate longitudinal strip of continuous plastic, of considerable width , capable of carrying printed information, two lateral strips with respect to the aforementioned intermediate band, also of plastic, but of reticular structure, specifically based on a three-wire network, these strips being fixed to the intermediate by linear and longitudinal welding in correspondence with its overlapping edges, complementing the band with two other fringes or strips of continuous and narrower continuous plastic, also intended to partially overlap by its free edge and be fixed to each other by means of a longitudinal weld, to define the tubular body, subsequently fragmented into sectors

or bags that close at their ends after receiving the expected product dose inside. Document ES 2239920 discloses a similar bag.

As can be deduced from the above, the indispensable requirement for obtaining a bag such as that of Utility Model U 9701734 or ES 2239920, is that the plastic material constituting the different longitudinal strips or strips participating in the band, that is to say continuous strips and reticular strips, be of compatible materials to be joined by heat welding.

More specifically, the mesh is made of low density polyethylene and the sheet is closed with medium density polyethylene.

In order for the mesh to have adequate strength and by its very nature of PE (polyethylene) it must have a minimum weight that can be set in the order of 70 gr / m2.

This brings with it that the bag in question, perfectly valid from the theoretical point of view because it meets the basic requirements demanded of it, in practice it cannot be used for certain products, such as for citrus fruits, as it is not competitive in the market compared to conventional solutions, precisely because of the amount of material required to manufacture it.

The seemingly obvious solution to this problem is to use meshes based on materials that, with a high degree of

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resistance, can be very light, so that the amount of material involved in the bags is minimal, as in the case of bi-oriented polypropylene.

However, this apparent solution is not feasible in practice because bi-oriented polypropylene is not

5 weldable with polyethylene, at least with the level of mechanical resistance that is required, so that fixing between longitudinal strips provided in this Utility Model U 9701734 or ES 2239920, is not feasible using these materials.

It is also not feasible to also replace the polyethylene sheets that participate in said Utility Model with 10 sheets of bi-oriented polypropylene, that is sheets of the same material as the constituent of the meshes, since the bi-oriented polypropylene does not weld on itself , at least in an effective way.

DESCRIPTION OF THE INVENTION

15 The bag for fruit and vegetable products that the invention proposes definitively solves the problem described above, allowing that, from a basic structuring such as the one shown in Utility Model U 9701734, medium density polyethylene can be used to obtain the closed bands that participate in it, and bi-oriented polypropylene to obtain the mesh stripes, being one and the other strips solidly joined together.

For this purpose and more specifically, the invention consists in incorporating into the continuous band constitutive of the base element for the formation of the bags, that is to say the continuous band in which the strips or bands of medium density polyethylene and of bi-oriented polypropylene, narrow strips of polyethylene that overlap the bi-oriented polypropylene strips in correspondence with the areas where said bi polypropylene stripes

25 oriented in turn superimpose the strips of medium density polyethylene, obtaining a kind of interleaving based on two layers of polyethylene that are directly welded together with interposition of the polypropylene mesh.

DESCRIPTION OF THE DRAWINGS

To complement the description provided herein and in order to help a better understanding of the features of the invention, according to a preferred example of practical realization thereof, a set of such is attached as an integral part of said description. Drawings in which the following have been represented as illustrative and not limiting:

Figure 1 shows, according to a partial perspective view, the continuous band used as the basis for obtaining the bag of fruit and vegetable products that constitutes the object of the present invention; Figure 2 shows a cross-sectional detail of the same band; Figure 3 shows a rear elevational view of the bag formed using the band of Figure 1;

Figure 4 shows a cross-sectional detail of the bag of Figure 3; Figure 5 shows, finally, a representation similar to Figure 1 but corresponding to a variant embodiment of the continuous band.

PREFERRED EMBODIMENT OF THE INVENTION

45 In view of the figures outlined, it can be seen that the bag disclosed is obtained on the basis of a continuous band (1), in which an intermediate longitudinal strip (2) of medium density polyethylene is established, capable of supporting any type of printed information (3), overlapping the marginal areas of the aforementioned strip (2) two stripes (4-4 ') which, as before, will be bi-oriented polypropylene and are structured in the form of

50 mesh, strips (4-4 ') that through their opposite marginal zone in turn overlap the marginal zone of other strips (55') of the same polyethylene as the intermediate strip (2) and of approximately half width that that of the latter.

On the marginal areas of these strips (2, 4 and 5) that are superimposed, narrow strips (6) of medium density polyethylene are also superimposed, strips (6) that are specifically superimposed on the strips (4

55 4 ') of bi-oriented polypropylene mesh, so that when applied to the continuous band (1) pressure and heat in these overlapping zones, the strips (2 and 5) are solidly joined by welding to the narrow strips ( 6) through the empty spaces of the meshes (4-4 '), as can be seen especially in Figure 2, so that the different components of the continuous band (1) are solidly joined together.

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Obviously the invention is applicable in the same way to a continuous band (1), as shown in Figure 5, which instead of presenting on both sides of the intermediate longitudinal strip (2) of polyethylene, a symmetrical structuring as in the case of figure 1, presents an asymmetric structuring, so that both sides of it are located two-sided strips of bi-oriented polypropylene, and only on one side of one of

5 these lattice strips (4) another longitudinal strip (7) of material and size coinciding with those of the central strip (2).

From here and as is conventional, the continuous band (1) closes on itself transforming itself into a tubular body, in which the marginal, longitudinal and free zones of the strips (5-5 ') or (4'- 7) overlap and are fixed by welding, with the participation of the narrow strips mentioned above (6), body

Tubular and continuous, which, as is also conventional, is fragmented into portions such as that shown in Figure 3, corresponding to respective units or bags that will conveniently close at their ends.

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Claims (1)

E09845741 07-15-2014 1. Bag for fruit and vegetable products, of the type that are constituted by a continuous band that closes on itself by means of a longitudinal welding line, constituting a fragmentary tubular body 5 in modules corresponding to respective bags, said modules being closed for each end after placing the product inside thus obtaining said bags, and in which, in said bags there are longitudinal strips of closed plastic 2, 5, 5 ', alternated with longitudinal strips of mesh 4, 4', which overlap by their marginal areas for union between them, characterized in that while the closed plastic strips 2, 5, 5 'are made of medium density polyethylene, the 4, 4' mesh strips are made of bi-oriented polypropylene, 10 incorporating said bags in correspondence with each overlapping line between the aforementioned strips, a narrow strip 6 also of medium density polyethylene, which is superimposed on the bi-oriented polypropylene strips in correspondence with the areas in which said polypropylene strips Bi-oriented 4, 4 'overlap, in turn, in the strips of medium density polyethylene 2, 5, 5', which is welded with the aforementioned longitudinal and wider strips of medium density polyethylene through the holes of the mesh, fixing the latter. fifteen 5