WO2013057597A1

WO2013057597A1 - Knitted net for wrapping agricultural products

Info

Publication number: WO2013057597A1
Application number: PCT/IB2012/051881
Authority: WO
Inventors: Manuel Alberto RODRIGUES PEREIRA; José Manuel CARVALHO SOUSA; Paula Cristina FERREIRA NUNES VENTURA
Original assignee: Cordenet-Produtora De Redes Agricolas, S.A.
Priority date: 2011-10-17
Filing date: 2012-04-16
Publication date: 2013-04-25

Abstract

The present invention relates to a Raschel knitted net for wrapping agricultural products for packaging purposes, comprising a plurality of longitudinal warp strips with knitted meshes and a plurality of transverse weft strips, characterised in that the angle between the warp strips and the weft strips ranges from 40-0°, in particular: • the weft strips cross the warp strips every 8 knitted meshes of the warp strips, in the case of standard Raschel knitted nets, and/or • the successive weft strips cross the warp strips in the same knitted meshes of the warp strips. The knitted nets described herein can be used for wrapping agricultural products for packaging purposes, namely cylindrical bales, for example straw bales, fodder bales, bales of silage materials, cut maize, pressed pulp, shredded plastic waste or comminuted household waste.

Description

DESCRIPTION

"NETWORK FOR THE INVOLVEMENT OF AGRICULTURAL PRODUCTS"

TECHNICAL FIELD OF THE INVENTION

The present invention relates to a Raschel knitted net from webs and wefts and a method for producing them.

BACKGROUND OF THE INVENTION

Document E0891698 discloses a Raschel knitted netting in which the pattern presented by the web / weft set is a triangular pattern, without alignment of the weft direction, having a shear strength lower than the net described in the present invention.

EP0919655 discloses a knitted netting in which the weft length is greater than 110% than the weft length obtained in conventional netting where the pattern presented by the web / weft set is a triangular pattern without alignment of the direction of the web. weft, with a resistance lower than the net described in the present invention.

SUMMARY OF THE INVENTION

The present invention applies to knitted netting for application in the packaging of agricultural products, more specifically for baling fodder. The present invention describes a Raschel knitted netting for wrapping agricultural produce comprising a plurality of knitted longitudinal straps and a plurality of transverse weft strips, characterized in that the angle formed between the straps and the weft tapes are substantially 45 °, in particular:

• weft tapes cross the web tapes out of every 8 knitted meshes of the standard Raschel netting tape, and / or

• successive weft tapes intersect the web tapes in the same knitted fabric as the web tapes.

Usually hay or straw bales have a usual weight of 400 - 800 kg; 1.50 m - 1.70 m and a diameter of 1.60 m - 1.80 m wide, which makes the nets that surround them subject to high pressure and friction.

Current nets tear at various points, which implies loss of agricultural material, decreased material accommodation and subsequent material deterioration. The knitted netting structure disclosed herein allows to increase the net strength, reducing the tears and maintaining the grammage and elasticity when compared to conventional netting, making it possible to use a smaller net size - about 0.5 minus net turns on application on bales.

The present invention, that is, the Raschel knitted netting is applied to networks produced on Raschel technology looms. The present invention applies to the Raschel knitted netting which is comprised of longitudinally knitted webs and transverse webs connecting the various webs.

One embodiment of the present invention is to describe a net for wrapping agricultural produce which comprises a plurality of longitudinally knitted tapes (2) and a plurality of transverse weft tapes (3a, 3b) wherein the angle formed between the web tapes (2) and the web tapes (3,3a) may range from 40-50 °, preferably 43-47 ° in particular substantially 45 °; when the network packs a product by wrapping. In a particular embodiment the wefts (3, 3a) cross the wefts (2) in every 8 knitted meshes of the wefts (2) for standard Raschel nets.

Another preferred embodiment is to describe a knitted netting (1) in which successive weft tapes (3a, 3b) cross the webs (2) into the same knitted webs as the webs (2), which considerably increases the netting. structure strength. Since the frames are aligned and the frame is consolidated in the direction of the frame (i.e. oblique).

In a preferred embodiment the described networks may be made of polymeric material, namely polyolefin.

In a preferred embodiment the netting described in the present invention may further comprise an additional web (3b), longitudinally offset along the webs relative to the first web (3a), crossing the web (2) at the midpoint of the first frame intersections (3a). This embodiment allows for even more compact bales, further reducing the propensity for tearing and better handling when baling more aggressive materials, for example shorter straw and corn canes.

Due to the crossing of the wefts we also increase the resistance of the wrapped product, for example straw or hay bale resistance to the penetration of rain and snow.

Crossing the wefts further provides a more uniform and flat surface on the bales, thereby reducing the appearance of possible oxygen pockets when applying the agricultural mesh described herein, preventing premature bale degradation.

Reduction of maintenance time and profitability of balers due to reduced interventions for network anomalies caused by defective bales;

In another preferred embodiment of the described knitted netting, the web (3) crosses the web (2) in every 8 knitted webs of the web to create a triangle / diamond structure along the web (1).

In an even more preferred embodiment of the knitted netting described in the present invention, the number of meshes per cm may range from 0.5 to 2.1 meshes per cm. That is, the length of the meshes may range from 0.476-2 cm, in particular 1.20 cm; 1.21 cm; 1.22 cm; 1.23 cm; 1.24 cm; 1.25 cm; 1.26 cm; 1.27 cm; 1.28 cm; 1.29 cm; 1.30 cm. In an even more particular case, the spacing between warp ribbons is approximately 2.50 cm; 2.51 cm; 2.52 cm; 2.53 cm; 2.54 cm. In a still more preferred embodiment of the knitted netting described in the present invention, the weft length (3) of the knitted netting may be greater than 106%, preferably greater than 110%, than the weft length obtained in conventional netting - i.e. that is, the effective transverse length of the mesh (3) of the knitted netting may be more than 106% or more than 110% than the required length of the mesh (3).

In a still more preferred embodiment of the knitted netting described in the present invention, each web may comprise or consist of a web or a plurality of webs wherein the plurality of webs of each web may additionally be twisted or twisted. In a more preferred embodiment, the web may have 1, 2, or 3 tapes.

Knitted nets described herein are used for wrapping agricultural products by wrapping in particular cylindrical / round bales, preferably straw bales, fodder, silage material, sliced corn, pressed pulp, shredded plastic waste or shredded household waste.

Another embodiment of the present invention is a Raschel knitted netting machine (1) for wrapping agricultural produce packaging, netting comprising a longitudinal web (2) and a transverse web (3), wherein the web (3) 3a) crossing the web (2) in the same meshes between successive webs of the web (3) so that the successive webs of the web (3) are aligned in the same direction. In a preferred embodiment, the net structure is obtained by crossing one weft ribbon for every 8 knitted meshes of the web.

The net thus produced has a triangle / diamond geometry in which the base is defined by the number of meshes contained between each weft insertion in the web and the size of the mesh, which with the reinforced weft structure or alternate wefts may in a preferred embodiment assume a diamond structure.

Until now it was possible to produce knitted nets where the base of the triangle was defined by 2, 4 or 6 meshes. The usual nets have 4 meshes between the intersections of the plot.

The new net described here allows to maintain the net weight and increase the net resistance. Since the alignment of successive weft tapes allows reinforcing the net across the entire width, preventing potential breakage failures between the webs, increasing compaction capacity - that is, the farmer involves more product with the same net length.

Net strength increases by approximately 12-15% compared to traditional netting, making it possible to decrease tear propensity up to 50% depending on the agricultural material to be involved.

In a preferred embodiment, the invention described is that there are 4 to 8 meshes between intersections where the base of the triangle - the diamond being the intercept of two triangles - is defined by 8 knitted web meshes.

The present net is achieved by altering the loom mounting configuration, by changing the working speeds of the mesh size to achieve the net described herein. Having knowledge of the structure of the network as explained herein, it is within the skill of the art skilled person how computer programming and / or mechanical configuration of the loom to obtain said network and allow the haul increase from 4 to 8 meshes.

A further preferred embodiment of the present invention is a Raschel knitted netting machine (1) for wrapping agricultural produce, netting comprising a plurality of knitted longitudinal tapes (2) and a plurality of knitted tapes. transverse weft (3a, 3b) wherein each weft ribbon (3, 3a) crosses each web ribbon (2) in the same meshes between successive weft ribbons (3) so that successive weft ribbons (3) ) are aligned in the same direction. In a more preferred embodiment, the machine wherein said net (1) comprises an additional web (3b), longitudinally offset along the meshes with respect to the first web (3a), crossing the web (2) at the midpoint of the first web intersections. weft (3a).

In an even more preferred embodiment of the machine wherein said net (1), the web (3) crosses the web (2) in every 8 knitted meshes of the web. This innovation, applied to 3-bar Raschel technology machines, enables the production of knitted netting, in a preferred double-woven embodiment, giving it a more balanced and more resistant structure. By using only one frame, a lighter and therefore more economical net is obtained.

With the present net the farmer uses less net which implies a lower net / bale cost, involves more material and the operating time is reduced by about 10%.

BRIEF DESCRIPTION OF DRAWINGS

For an easier understanding of the invention, the following are examples of preferred embodiments of the invention which, however, are not intended to limit the scope of the present invention wherein:

Fig. 1 - Representation of the knitted net with the base of the triangle consisting of 8 meshes, where (1) represents the net, (2) the web, (3) the web, (4) one web of the web and (5) a network support tape.

Fig. 2 - Representation of the reinforced net of an embodiment of the present invention with two wefts (3a, 3b, double weft, the second opposing weft), wherein the weft (3) crosses the web (2) in every 8 knitted sts of the web. to create a diamond structure along the net (1).

Fig. 3 - Representation of a diagram of the net design in which the web (3a, 3b) crosses the web (2) in every 8 knitted meshes of the web to create a diamond structure along the net (1). . DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a knitted net (1) on Raschel technology looms from webs (2) and wefts.

(3), and a method for their production.

By web (2) is meant the tape which, during the manufacturing process of the net (1), runs longitudinally in the direction of production and the web (2) is formed by meshes.

(4).

By web (3) is meant the tape which, during the manufacturing process of the net (1), runs in the transverse direction.

Each knit (4) corresponds to a knitted loop. The loops are not formed gradually, but all at the same time on all the needles (web mesh).

The knitted netting (1) of the present invention is used for wrapping materials such as cylindrical elements such as straw bales or fodder. In addition, nets such as this are applied, for example, to silage bales, chopped corn bales, pressed pulp bales, shredded plastic waste bales or fragmented household waste bales.

The knitted netting object of the present invention can be produced using Raschel technology machines.

Knitted nets are produced using polymeric materials such as polyolefins, either in webs or wefts. As can be seen from fig. 1 the net, knitted with webs and wefts, namely a simple weft, comprises a triangle-shaped geometry in a preferred embodiment with 8 meshes.

In fig. 2 is a preferred embodiment of the reinforced net - weft 3a and 3b knitted with webs and wefts, namely a double weft giving rise to a diamond geometry consisting of 8 meshes.

In the scheme shown in fig. 3 GB1 represents the needle bar where the knits are knitted and GB2 / GB3 represents the weft dowel bars. They can be used simultaneously or separately.

A reinforced, triangle-shaped net that can be produced with one frame using bars GB1 and GB2 or two frames using bars GB1, GB2 and GB3, as shown in Fig. 2 and Fig. 3.

As can be seen from Figs. 1 and 3, the simple net, produced with bars GB1 and GB2 has a shape of a triangle with an 8 mesh base.

The reinforced mesh produced with bars GB1, GB2 and GB3 has the shape of a diamond with a base of two inverted 8 mesh triangles, as shown in Fig. 3.

The reinforced and simple nets described above are produced with polymeric materials, namely polyolefins, both in webs and webs. A reinforced net shown in FIG. 2 comprises a triangular geometry, wherein the triangle bale is made up of 8 meshes in a preferred embodiment and is intended for wrapping agricultural products such as straw or fodder in the form of round bales.

This reinforced mesh with a triangular geometry in which the base of the triangle consists of 8 meshes in a preferred embodiment is also intended for wrapping silage bales, cut corn bales, pressed pulp bales, shredded plastic waste bales or bales of shredded household waste.

Another embodiment is a knitted net with webs and wefts for wrapping agricultural products, namely for wrapping round bales, straw or fodder bales, silage bales, chopped corn bales, pressed pulp bales, waste waste bales. shredded plastic or shredded domestic waste bales containing a reinforced structure in which the reinforced netting structure consists of crossing a double weft ribbon for every 8 knitted meshes of the web. In particular, the reinforced mesh has a triangular geometry wherein the base of the triangle is defined by the number of meshes contained between each weft insert and the size of the mesh, and the base of the triangle consists of 8 meshes.

For the knitted netting of the present invention, the breaking load gains are approximately 15%. Since all other functional characteristics remain in relation to to conventional nets such as net weight and elongation coefficient.

Typical weight values are between 10.5 and 11.0g / m. Typical elongation values are 14 - 17%.

The present invention is, of course, not in any way restricted to the embodiments described herein and a person of ordinary skill in the art may foresee many possibilities for modification thereof without departing from the general idea of the invention as defined in the claims.

The preferred embodiments described above are obviously combinable with each other. The following claims further define preferred embodiments of the present invention.

Claims

1. Raschel knitted netting (1) for wrapping agricultural products, comprising a plurality of knitted longitudinal tapes (2) and a plurality of weft tapes.

(3a, 3b) transverse, characterized in that the angle formed between the web strips (2) and the weft tapes

(3,3a) vary from 40-50 ° when the net packs a wrapping product, in particular the weft tapes (3, 3a) intersect the web tapes (2) in every 8 knitted meshes of the web tape (2 ) for standard Raschel nets.

Knitted netting (1) according to claim 1 wherein the angle formed between the web tapes (2) and the weft tapes (3,3a) is substantially 45 ° when the net packs a wrapping product. .

Knitted netting (1) according to claim 1, wherein the successive weft ribbons (3a, 3b) cross the warp ribbons (2) into the same knit webs as the web ribbons (2).

Net according to any one of the preceding claims comprising an additional web (3b), longitudinally offset along the meshes with respect to the first web (3a), crossing the web (2) at the midpoint of the first web (3a) intersections. ).

Net according to any one of the preceding claims, wherein the web (3) crosses the web (2) in every 8 knitted meshes of the web to create a triangle / rhombus structure along the net (1).

Netting according to any one of the preceding claims, which comprises polymeric material.

Netting according to the preceding claim wherein the polymeric material is polyolefin.

Netting according to any one of the preceding claims wherein the number of meshes per cm ranges from 0.5 - 2.1 meshes per cm inclusive.

A net as claimed in any preceding claim wherein the effective transverse length of the web (3) is 106% greater than the required length of the web.

A net as claimed in any preceding claim wherein each frame comprises a tape or a plurality of tapes.

A net as claimed in any preceding claim wherein the plurality of tapes of each frame are twisted or twisted.

Netting according to any one of the preceding claims for use on cylindrical bales.

A net as claimed in any preceding claim wherein the agricultural products comprise straw, fodder, silage material, cut corn, pressed pulp, shredded plastic waste or fragmented household waste.

14. Raschel knitted netting machine (1) for wrapping agricultural produce wrapping, netting comprising a plurality of knitted longitudinal tapes (2) and a plurality of transverse weft tapes (3a, 3b) characterized in that the web (3, 3a) crosses the web (2) in the same meshes between successive webs of web (3) so that successive webs of web (3) are aligned in the same direction.

Machine according to the preceding claim wherein said net (1) comprises an additional web (3b), longitudinally offset along the meshes with respect to the first web (3a), crossing the web (2) at the intermediate point of the intersections. of the first frame (3a).

Machine according to claim 10 or 11, wherein said net (1), the web (3) crosses the web (2) in every 8 knitted meshes of the web.