MXPA98009530A - Wired network of step modific - Google Patents

Abstract

A woven web includes longitudinal polyolefin slats and lateral polyolefin slats woven with the longitudinal polyolefin slats to form the woven web. The side polyolefin slats of the woven net have an actual pitch length greater than 110% of a step length calculated for the woven rein. The actual pitch length which has an excess of 110% of the step length calculated for the woven net prevents transverse shrinkage of the r

Description

WIRED NETWORK OF MODIFIED STEP BACKGROUND OF THE INVENTION The invention relates to a woven network, and more particularly, to a woven network as used in wrapping, for example, pallet loads and bales of agricultural products. More particularly, the invention relates to a woven network used in wrapping, wherein the woven net is designed to minimize the transverse shrinkage of the net. In Figure 1, the Raschel woven network 10 including step strips 12 and stripe strips 14, is shown and is further described in the patent of E. U. A. No. 5, 104,714 of Leiber et al. Due to the triangular pattern of the woven net, the entire Raschel network becomes narrower when pulled longitudinally. For example, when a pallet is wrapped with a conventional Raschel network, when the network is stretched by approximately 60%, the network can change in width from 50 cm to approximately 25 cm. When a longitudinal force is applied to the woven net, the stripes become longer. The longer the strip, the step must be longer to maintain the same network dimensions. However, to a certain degree of elongation, the step should not be extended since the step tends to straighten up rather than lengthen. The more straight the steps are, the smaller the distance between the strips, and the narrower net is the result of the transversal shrinkage of the woven net.

Transverse shrinkage has been inherent in the woven network of Raschel since machines have existed to produce said woven network. It is well known that the Raschel network will become narrower even when it has been woven in Raschel weaving machines. For example, if a woven Raschel network of 121.92 cm is desired, approximately 127 cm of the net is woven because the net is narrowed by approximately 5.08 cm between the fabric and the winding zones. When a constant network width is needed, the width can be regulated by changing the step voltage in the weaving machine. The producers of woven netting machines provide an installation in their machines to regulate the width of the network, which depends on many factors including the type of materials, temperature, ribbon dimensions, fabric tension and fabric pattern. The producers of weaving machines are aware that grid shrinkage is inherent in the Raschel woven network. Said producers are also aware that the increased tension in the passage creates a narrower network and a loose tension in the passage avoids the narrowing to a certain degree. However, the change in step tension is not sufficient to completely overcome the transverse shrinkage in the woven network.

In U.S. Patent No. 4,781,291 of Van Ginhoven's prior art, which is directed to an extruded network, Van Ginhoven recognizes that a problem in the "Raschel woven network" is that it shrinks over the entire width when pulled longitudinally. " (Column 1, line 19). This way, Van Ginhoven appreciates that the woven net of Raschel shrinks when pulled longitudinally due to the geometric pattern of the woven net. Van Ginhoven addresses this problem by proposing a network of square openings, instead of Raschel triangles, to solve the problem. By having transverse strands perpendicular to the longitudinal strands, creating rectangular rather than triangular openings, transverse shrinkage is overcome. Therefore, there is a need in the art for a woven network, which does not shrink during the entire production process.

In addition, there is a need in the art for a woven web that maintains its full width during production and can also be widened to more than its full production width.

COMPENDIUM OF THE INVENTION With the foregoing in mind, the modified woven netting in accordance with the invention provides a "modified" step in relation to the passage of the conventional woven net. A modified step is a step whose length is as desired, which is an excess of and distinct from the conventional woven net with a loose passage only to the maximum extent allowed by the weaving machine. According to the invention, a woven web includes longitudinal polyolefin battens and lateral polyolefin slats woven with the longitudinal polyolefin slats to form the woven web. The side polyolefin slats of the woven web have an actual pitch length greater than 110% of the step length calculated for the woven web. According to a further aspect of the invention, a wrapped bale of agricultural grains includes a cylindrical bale of agricultural grains and a woven net having longitudinal polyolefin slats and lateral polyolefin slats woven with the longitudinal polyolefin slats to form the woven net. . The side polyolefin slats of the woven web have an actual pitch length greater than 110% of the step length calculated for the woven web. The woven web can also extend around the circumference and over the rim of the cylindrical body enclosing and maintaining beads therein.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, herein referred to and forming a part thereof, illustrate preferred embodiments of the invention and, together with the description, serve to explain the principles of the invention, wherein: Figure 1 shows a woven web of Conventional raschel; Figure 2 shows a woven Raschel net according to the invention; Figure 3a illustrates a woven web roll; Figure 3b illustrates a partially unwound web woven roll; Figure 3c illustrates the calculation of the pitch length for the woven network; Figure 4a shows a corrugated slot plate for use in a weaving machine; Figure 4b shows a single round piece for use with a corrugated slot plate; Figure 5 shows a shrinkage / elongation curve for a conventional woven network; Figure 6 shows a shrinkage / elongation curve for a woven network according to the invention; Figure 7 shows a bale of hay wrapped with a conventional woven net; and Figure 8 shows a bale of hay wrapped with a woven net according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS Figure 2 shows a woven Raschel network 16 according to the invention, which provides a "modified" step 18 in relation to the passage of the conventional woven network. The modified step has a length greater than the length of the step obtained when it is loosened to the maximum allowed by the weaving machine. For example, a woven web including a modified step that is approximately 30% larger than the prior art step provided by the weaving machine will be narrowed by approximately 12% at a 60% elongation of the woven web during wrapping , while the same network without a modified step will be narrower by approximately 50% at an elongation of 60%. The step is created by moving the cross bar between two needles while the net that is being woven moves longitudinally in the knitting machine. Due to the two directional movements, step 18 creates limbs of a triangle, while strip 20 creates a triangle base. The tension of the pitch can be adjusted, but it is limited and can only produce a pitch with a real length of less than 10% of the calculated length of the end of the triangle created by moving the rail between two needles at the longitudinal speed. The preferred amount of elongation of the step length depends on the particular network application. For elastic blade wrapping, the preferred actual pitch length is about 135% of the calculated step length for the network. For a conventional wrapping network with an elongation at break of about 20%, a modified step is not necessary since said network only stretches about 1 -3% in normal use and does not exhibit transverse shrinkage. The characteristics of the Woven Step Net Modified according to the invention can be seen by comparing an actual pitch length of a given net length with a calculated pitch length. The modified pitch woven network has an actual pitch length greater than 10% of the calculated step length. The suggested procedure for comparing the actual step length with the calculated step length is illustrated in Figures 3a to 3c and can be described as follows: (1) Measure the length (L) between the two end strips on a roller of the net woven as shown in Figure 3a. (The total length of the roller is shown as O). (2) Divide the length (L) by the number of strips minus one to define an average distance between the two strips (H). (3) Unroll part of the woven net and measure the length between such as distances (10A) and divide them by 10 to define an average length between two triangle ends (A) as shown in Figure 3B. This measurement must be made while applying approximately 50 g to the fringes over which the step will be measured. (4) Calculate the length of the step (S) between the two triangle ends as shown in Figure 3c as follows: (5) Determine an actual pitch length for the distance 10A by unwinding some of the woven web and transversely cutting the strips and steps. Take the step between two strips and measure the step length while flattening the step on a flat plate to determine the actual step length (ASL). (6) For the modified woven mesh network, ASL will exceed 10S by more than 10%. Existing Raschel weaving machines do not provide an installation to provide a modified step. The maximum l step that can be woven on these machines can greatly widen the network very little, but even if this occurs, the network will tend to narrow. In order to create the modified step according to the invention and to overcome said tissue machine limitations, a corrugated slot plate, as shown in Figure 4a, can be incorporated in the weaving machine. The use of a conventional slot plate is illustrated, for example, in the US patent. A. No. 3,646,782 to Kohl. The corrugated slot plate includes a flat plate 22 providing corrugations 24, which forces the steps to traverse a longer distance as the steps move between the needles of the weaving machine than the one that could be traversed in a machine. conventional tissue. The steps can not move in a straight line; the steps should follow the curvature of the corrugated slot plate. Therefore, when the woven net leaves the corrugated slot plate, the step length is longer than the original. The thicker the corrugations between the needles on the flat plate, the longer steps will occur. When an equal amount of step modification is required over the entire width of the network, a corrugated plate as described with respect to Figure 4a can be used. When only one modified step is required on particular steps, a flat plate without corrugations (not shown) can be used to produce a thicker area between the particular needles. This can be achieved by attaching a round piece 26 to the flat plate through a screw or other suitable fastener. The round piece 26 is shown in Figure 4b. With the Modified Step Web, it is not possible to regulate the width of the network by increasing the step voltage as it was done in the conventional woven net. When weaving with a modified step, the width will always remain the same and will be a function of the number of needles and the distance between them. No shrinkage will occur during the weaving process. The width in the woven network of modified pitch can differ only in spectacular quantities equivalent to the distance between needles. It can be appreciated that there are many distinct advantages with respect to the present invention. The insertion or removal of an individual round piece is simple. Placements of the correct parts in the correct place when different amounts of modification of passage of different plates through the network are needed, is simplified, since a different thickness of the individual round piece can be used. It is important that when the same amount of pitch modification is needed over the net width, an individual corrugated slot plate (as shown in Figure 4a) can be used. The amount of step modification created over the entire width of the network can vary by a certain degree by regulating the step voltage. This is done by regulating the step voltage in the existing machine. Only when a different amount of modified pitch is needed across the width of the network could different individual round pieces (distinguished by their different thicknesses) be used. It can be appreciated by those skilled in the art that the modified woven network in accordance with the invention provides many unexpected advantages over the conventional woven network. In particular, the modified woven mesh network is a little stronger, maybe because the step does not create radial tensions on the fringes as in the conventional woven net. Comparing FIGS. 5 and 6, it can be seen that the inclination of the shrinkage / elongation curve by the woven network of modified pitch is a function of the amount through which the pitch is modified. A very small degree of shrinkage always occurs in the woven network of modified pitch at the time when the longitudinal force is applied. Comparing FIGS. 7 and 8, when a round hay bale is wrapped using a modified woven network of pitch wider than the bale, a considerable amount of coverage is obtained on the edge, considering the number of stripes on the outside of the bale. bale of hay. (Note that in Figures D 1 = D2, L1 = L2, and D3 >; D2). The wrapping over the edge of bales of hay provides the advantage of increasing the area covered on both sides of the bale. Since the length of the strip can be reduced in the smallest diameter in the extremities, some bending or folding may occur as the net extends over the edge. However, it has been found that the amount of coverage over the edge is a function of the net eltion while it is being wrapped, and the modified step amount. For example, if the circumferential length of the last fringe is x% shorter than the bale, the wrapping is done with a stretch of x + 1%, then the last fringe will create an eltion of 1%. In this case, even if the shortest stretch is stretched only 1%, the steps extend to their maximum length with respect to the length of the modified pitch. Therefore, the distance between the two strips in this case is greater than the distance between the two needles in the machine. The net merely does not shrink in width when wrapped around the bale (the distances between the stripes remain absolutely constant without widening), but on both sides of the bale, the distances between the stripes are greater than the distance between the needles, due to the radial forces that are created, which extend the steps to their maximum modified length. It will be observed in the patent of E. U. A. No. 4,917,008 van den Wildenberg, the coverage on the edge is achieved by using elastic elements on both ltudinal edges. Said elastic elements are not necessary when the present invention is used, due to the new properties of the network. In addition to the above properties, the new network can also be widened to more than its original width, even when a ltudinal force is applied to the network. Said phenomenon is created on the peripheral portions of the bale as discussed above. Since the invention has been described in its preferred embodiments, it is understood that the words that have been used are words of description, rather than limitation, and that changes can be made within the field of vision of the appended claims without departing from the spirit of the invention. true spirit and scope of the invention in its broader aspects. For example, the new invention is applicable to all types of networks that contain ltudinal strips and lateral passages. Even in networks with horizontal steps, which create quadrant openings, it will be an advantage if they are woven with modified steps. Said network usually does not shrink in the ltudinal direction; but without a modified step, this can be widened to more than its original width. In addition, the present invention is not limited to any particular material or type of strands, tapes, monofilament, multifiiaments, or the like. Moreover, it will be appreciated that a woven web can be produced only with some loose steps on both sides or anywhere althe width of the network, the network can be widened during the wrapping process, in any predetermined area of the wrapped load, etc.

The woven net can also be produced with different amounts of pitch modification. If a given number of fringes is on the edge, using the upper step modification in those fringes could create a higher coverage on both sides of the bale.

Claims (8)

REIVI NDICATIONS

1 .- A woven net, comprising: longitudinal polyolefin strips; lateral polyolefin slats woven with said longitudinal polyolefin slats to form a woven net; wherein at least one of the lateral polyolefin slats of said woven network has an actual length greater than 11.0% of the length of a step length calculated for said woven network.

2. A knitted net according to claim 1, wherein at least one of the side polyolefin battens comprises a plurality of polyolefin battens.

3. A woven net according to claim 2, wherein said plurality of polyolefin battens are on the outer edges of the woven net.

4. A knitted net according to claim 1, wherein at least one of the lateral polyolefin battens comprises all the polyolefin battens.

5. A method for producing a woven network in a weaving machine, which comprises: supplying lateral polyolefin slats; supply longitudinal polyolefin slats; adjusting at least one of the trajectories of the polyolefin ison in the tissue machine; weave the lateral polyolefin islets woven with the longitudinal polyolefin battens to form a woven net; wherein the step of adjusting at least one of the trajectories of the lateral polyolefin stones results in a side polyolefin strip in the woven web having a real length greater than 1 10% in the length of a step length calculated for the woven network.

6. A method for producing a woven net in a weaving machine, wherein the step of adjusting at least one of the trajectories of the lateral polyolefin ison further comprises using a corrugated slot plate in the machine. tissue.

7. A bale wrapped in agricultural grains, comprising: an indian paca of ag ricultural grains; and a woven web produced through a weaving machine comprising longitudinal polyolefin battens, lateral polyolefin slats woven with the longitudinal polyolefin slats to form the woven web; wherein said polyolefin side slats of the woven web have a real length greater than 10% of the length of a step length calculated for said woven network; and where a knitted net extends around the circumference and over the edge of a cylindrical body enclosing and holding the glands in it.

8. - A bale wrapped with agricultural grains according to claim 7, wherein the woven net extends over the edge of the indian body, securing the edges of the same. SUMMARY A woven net includes longitudinal polyolefin slats and lateral polyolefin slats woven with the longitudinal polyolefin lathes to form the woven net. The side polyolefin slats of the woven web have a real pitch length greater than 11.0% of a step length calculated for the woven web. The actual pitch length which has an excess of 1 10% of the step length calculated for the woven net prevents transverse shrinkage of the net.