CN115474482B

CN115474482B - Woven net

Info

Publication number: CN115474482B
Application number: CN202211046218.1A
Authority: CN
Inventors: 徐晓辉
Original assignee: Changzhou Xinhui Netting Co ltd
Current assignee: Changzhou Xinhui Netting Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2023-08-01
Anticipated expiration: 2042-08-30
Also published as: CN115474482A; WO2024045913A1

Abstract

The invention discloses a woven mesh, and belongs to the field of woven mesh structures. The woven mesh comprises a plurality of warp knitting yarns which are radially arranged, and two adjacent warp knitting yarns are connected through a connecting wire; the warp knitting is formed by connecting chain links woven by loop fibers in series, at least part of the warp knitting also comprises lining warps which are in a substantially straight state and are inserted into the chain links along the radial direction; the stretching ratio of the adopted looped fibers is larger than that of the lining warp, and the stretching ratio of the looped fibers to the lining warp is in the range of 0.85-1.25a relative to the nominal stretching ratio a. Therefore, the loop fiber and the lining warp which meet the requirements are selected, so that the loop fiber and the lining warp meet the tensile proportion, the knitted warp-knitted middle lining warp and the chain links have similar tensile rates, the maximum tensile force can be exerted at the same time, and the comprehensive strength of the grass tying net is improved.

Description

Woven net

Technical Field

The invention relates to the technical field of woven mesh structures, in particular to a woven mesh.

Background

At present, after crop straws are harvested, most of the crop straws are bundled and packed by a straw bundling net and then transported. The grass-binding net is a knotless net which is knitted by a warp knitting machine, is generally formed by looping fiber coils, and is connected by wefts. The structure of the grass bundling net is characterized in that the net holes are larger, and the grass bundling net has certain bearing strength.

For the grass-binding net it is generally required that it has a sufficiently light weight in order to be able to obtain a correspondingly low material consumption, lower material costs. On the other hand, the grass bundling machine needs to have a certain radial bearing capacity, and can be rolled into a bag when bundling grass. To increase the load carrying capacity of each warp chain, there are two approaches. The strength of each bundle of looped fibers is improved, the toughness of the looped fibers is improved, and the weakening of warp knitting bending looped fibers is reduced. In the prior art, the improvement of the fiber strength has a certain technical bottleneck, and the weakening of the fiber strength by warp knitting and looping is unavoidable. If the tenacity of the looped fibers is directly improved, the denier grammage will be increased.

For the current mesh grid industry, the weaving method is generally similar, and if the gram weight of the unit area can be reduced under the condition of ensuring the strength, the control of the mesh grid cost is greatly facilitated. But this is also a problem currently commonly faced in the industry.

The applicant has disclosed the following schemes: in the warp-wise chain knitting structure for the woven mesh and the grass tying mesh (application number: 202020057839. X) using the warp-wise chain knitting structure, the warp-wise chain knitting structure is formed by compounding two parts of a warp-wise chain knitting structure and a warp-wise chain lining which is flatly lined in the warp-wise chain knitting structure, the warp-wise chain knitting structure is formed by serially connecting loop links formed by warp knitting loop fibers, and the denier of the warp-wise chain knitting structure is 3 times that of the warp-wise chain knitting structure.

US patent US20200385902A1 discloses a solution, which comprises a plurality of warp threads extending parallel to each other in the longitudinal direction, wherein a plurality of weft threads run back and forth between two adjacent warp threads and link the adjacent warp threads to each other, and comprises a first supporting thread extending along the warp threads and penetrating the thread at a plurality of points.

In the two schemes, in order to improve the overall strength under the condition of low quality, the lining warp is added in the chain, and the overall strength is improved through the lining warp. However, when the method is used, the mode of combining the looping fiber and the interlining can improve certain strength, but in the use process, once the looping fiber or the interlining is broken, the whole knitting chain is broken, the comprehensive strength of the knitted net cannot reach theoretical analysis strength, and the difference is larger.

Thus, further analytical studies are needed as to how to increase overall strength at lower unit grammage.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the defect that the grass-binding net in the prior art is difficult to reach larger strength under the condition of lower unit gram weight, and provides the grass-binding net, and the whole tensile strength of the grass-binding net is improved through the selected control of loop-forming fibers and lining warps.

2. Technical proposal

In order to achieve the above purpose, the technical scheme provided by the invention is as follows:

the invention relates to a woven net, which comprises a plurality of warp knitting yarns which are radially arranged, wherein two adjacent warp knitting yarns are connected through a connecting wire; the warp knitting is formed by connecting chain links woven by loop fibers in series, at least part of the warp knitting also comprises lining warps which are in a substantially straight state and are inserted into the chain links along the radial direction;

the stretching ratio of the adopted looped fibers is larger than that of the lining warp, and the stretching ratio of the looped fibers to the lining warp is in the range of 0.85-1.25a relative to the nominal stretching ratio a.

As a further improvement of the invention, the nominal stretch ratio a is in the range of 1.45 to 1.58.

As a further development of the invention, the nominal stretch ratio a has a value of 1.5.

As a further improvement of the invention, the tensile proportion of the loop-forming fibers to the backing warp is 1.4-1.7.

As a still further improvement of the present invention, the ratio of denier A to denier C of the looped fibers is b, said b being 0.13 to 0.55a relative to nominal draw ratio a.

As a still further improvement of the present invention, said warp knit has a total denier of 900-1300 denier.

As a still further improvement of the present invention, the connecting wire has a denier no greater than the denier of the looped fibers.

As a further development of the invention, the inserts are alternately threaded into each chain link in warp knitting.

As a further development of the invention, the pin points through the links are ring-shaped openings of the links, or nodes of the links.

As a further improvement of the invention, the connecting lines are connected between two adjacent warp knitting in a zigzag shape.

As a further improvement of the invention, the lining is formed by combining a single fiber yarn or two or more fiber yarns; the looped fibers are single fiber filaments.

As a further development of the invention, the backing is formed by folding or winding individual flat filaments.

The invention relates to a knitted net, which comprises a warp knitting and a connecting line between warp knitting, wherein the warp knitting is formed by connecting chain links woven by loop forming fibers in series, and the chain links comprise three strands of wires formed by encircling the loop forming fibers; the warp knit further comprises warp courses, which are in a substantially flat state, interspersed in the radial direction in the links;

the stretching rate of the adopted looped fibers is larger than that of the lining warp, and the stretching proportion of the looped fibers to the lining warp is 1.35-1.70.

As a further improvement of the present invention, the ratio of denier A to denier C of the looped fibers is b and the b value is in the range of 0.2 to 0.7.

As a further improvement of the invention, the loop-forming fibers and the lining warp are formed by adopting extrusion film shredding.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) According to the grass bundling net, the loop forming fibers and the lining warps which meet the requirements are selected through limiting the stretching ratios of the loop forming fibers and the lining warps, so that the loop forming fibers and the lining warps meet the stretching proportion, the warp knitting middle lining warps and the chain links after knitting have similar stretching ratios, the maximum pulling force can be exerted at the same time, and the comprehensive strength of the grass bundling net is improved.

(2) The grass bundling net of the invention limits the ratio of the denier of the looped fibers to the denier of the lining warp, so that the chain links and the lining warp can be distributed to larger strength under the condition of lower gram weight of the grass bundling net, thereby reducing the loss of the knots and controlling the cost; on the other hand, the tensile proportion of the looped fibers to the warp is limited, so that the maximum force strength value of the chain links and the warp can be better exerted. By controlling the denier and the stretching proportion, the grass-binding net can exert larger economic value.

Drawings

FIG. 1 is a schematic view of a partial structure of a grass-binding net;

FIG. 2 is a schematic view of a warp knit construction;

FIG. 3 is a schematic illustration of the interpenetration of the links with the bushings;

fig. 4 is a schematic view of the whole structure of the grass-binding net.

Reference numerals in the schematic drawings illustrate:

1. warp knitting;

101. looping the fiber;

102. lining warp;

2. and (5) connecting wires.

Detailed Description

For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples.

The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the invention, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the invention, without affecting the effect or achievement of the objective. Also, the terms "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the invention for modification or adjustment of the relative relationships thereof, as they are also considered within the scope of the invention without substantial modification to the technical context.

Fig. 1 shows a partial structure of a woven mesh, wherein the up-down direction of the paper surface in fig. 1 is the warp direction, and the left-right direction is the weft direction. The knitted net shown in fig. 1 comprises a plurality of warp knitting yarns 1 which are radially arranged, and two adjacent warp knitting yarns 1 are connected through a connecting wire 2. Warp knitting 1 is formed by serially connecting ring-shaped chain links one by one, the chain links are formed by knitting the loop forming fibers 101 in a winding mode, and each chain link is formed by winding the loop forming fibers 101 in a serial connection mode to form three threads.

Referring specifically to fig. 2, each link has three strands of yarn in the horizontal direction, which are formed around the same looped fiber.

The woven mesh at least partially warp knit 1 further comprises warp knit 102, the warp knit 102 being in a substantially straight state interspersed in the links in the radial direction. This example is an embodiment, and each warp knitting 1 may be constructed with warp elements 102.

In an embodiment, the warp knit in a substantially flat state bears the load of the warp direction in combination with the warp knitting. It should be understood that "straight" of the warp lining is relative to the bent braid structure of the looped fibers, and that the structure of the warp lining in a direction perpendicular to the mesh plane of the woven mesh, such that the warp lining is alternately threaded up and down in the vertical direction into the coil links, forms a suitable bend, which is also within the meaning of "straight" or "substantially straight". That is, the flat state does not require an absolute straight state when deployed, allowing some bending, but must be able to bear the warp load together when in use.

It should be noted that the elongation of the looped fibers 101 used in this example is greater than that of the backing 102, and the ratio of the looped fibers 101 to the backing 102 is in the range of 0.85-1.25a relative to the nominal ratio a.

Stretch ratio in this scenario refers to the ratio between the stretch ratio at break of looped fibers 101 and the stretch ratio at break of backing 102. The breaking elongation here means the percentage of the length of the drawn yarn to the original length when the yarn breaks under the action of an external force.

The calibration drawing ratio means a certain calibration value, and when the drawing ratio is selected, the calibration drawing ratio can be used as a reference, so that a proper silk thread is selected. The value of the nominal stretch ratio a is generally determined between 1.40 and 1.70 and can be used as the selection interval in the embodiment.

According to the analysis, the main consideration in the selection of the warp and looping fibers is the gram weight and the strength, and the strength break when the looping fibers are looped, but the change of the yarn stretching rate is ignored, so that the integral strength cannot reach the ideal value.

For example, the strength of the looped fibers is selected to be N, and after the loop is woven, there is 30% -40% breakage, for example 40%, and the strength of the actual links is 3×0.6N. The strength of the lining is M, and the lining is in a straight state, so that the lining is considered to have no strength loss. The theoretical value of the warp knitted strength Q of the looped fibers and the warp knit should be q=3×0.6n+m.

The above calculation method is the main method for calculating the total strength by adopting the weaving mode at present. However, the actual warp knitting strength cannot reach the theoretical value, and the difference is not caused by measurement errors, but the setting principle of the calculation mode is wrong again. When adding the strength of the links to the warp strength, one precondition is that the elongation of both is the same, i.e. both can reach a maximum strength value at the same time after being elongated to a certain length, otherwise they would not be able to cooperate effectively. While current methods mostly ignore the effect of elongation.

For the material itself, its elongation should be of its inherent nature. However, the yarn used in this example can be changed in elongation by softening, changing the cross-sectional shape, or the like. The stretching ratio referred to in the present invention also mainly refers to the stretching ratio of the formed yarn.

It is worth noting that there is also a great difficulty in how to control the elongation.

As an ideal value, the looped fibers and the warp knitted fabric should be controlled to have similar stretching ratios, but after the looped fibers are knitted into links, the links are subjected to stress concentration, and the links are broken, so that the elongation of the warp knitted fabric is greatly different from the theoretical value.

In other cases, the warp knitting is heated or otherwise softened after the web formation to adjust the chain links and the warp knitting to have similar stretching ratios, thereby ensuring the exertion of the combined strength of the chain links and the warp knitting. Although this treatment method can obtain a similar elongation, it has various problems. On one hand, after heating, the strength of the looping fiber and the lining itself is affected, and how to control the heating mode is more complex; on the other hand, the additional heating equipment is needed for heating after the mesh is woven, the existing site space and packaging mode are adjusted, the cost is high, and the mesh is contrary to the aim of low-cost production.

In this embodiment, a nominal draw ratio a is used as a reference, and the draw ratio of the looped fibers 101 to the backing 102 is selected according to the nominal draw ratio, and one of the yarns may be selected to have a corresponding draw ratio as long as the draw ratio of the other yarn is known. Of course, the silk thread can be adjusted according to the strength requirement before knitting and net forming, silk threads with corresponding stretching rate are obtained, and then knitting is carried out, so that the cost is controllable.

As another embodiment, the nominal draw ratio a ranges from 1.45 to 1.58, for example, 1.48, 1.50, 1.52, etc. Taking a 1.50 as an example, the stretch ratio of the looped fibers 101 to the backing 102 is 1.28-1.80.

As another embodiment, the stretch ratio of the looped fibers 101 to the backing 102 may be limited to a range of 0.90-1.15a relative to the nominal stretch ratio a, which may range from 1.50-1.56. Within this range, the ratio of the stretch ratio of the looped fibers 101 to the warp yarns 102 is preferably in the range of 1.35 to 1.79, the stretch ratio of the looped fibers is about 22% to 40% higher than the stretch ratio of the warp yarns, and the stretch ratio of the woven tandem links is similar to the stretch ratio of the warp yarns and can be controlled within 8%

Further, the loop fiber 101 and the backing 102 are selected by considering the strength and the stretch ratio, and the ratio of the denier A of the loop fiber 101 to the denier C of the backing is set to b, and the ratio b is 0.13-0.55a relative to the nominal stretch ratio a. When a ranges from 1.50 to 1.56, b ranges from approximately 0.20 to 0.86. It can be seen that b ranges from approximately 0.20 to 0.86 when the nominal stretch ratio is 1.50 to 1.56, and that the stretch ratio of the looped fibers 101 to the backing 102 is 1.35 to 1.79. At the moment, the processing cost is lower, the chain links and the lining warps of the looped fibers can be guaranteed to have similar stretching ratios, and the overall strength is improved.

As one embodiment, warp knit 1 formed of looped fibers 101 and warp knit 102 has a total denier of 900-1300 denier.

In other embodiments, it may also be defined that the denier of the connecting wire 2 is not greater than the denier of the looped fibers 101. The main function of the connecting cord 2 is to connect a plurality of warp knitting yarns and not to carry warp load, so that the denier thereof can be controlled within a relatively small range.

There are various embodiments for the specific arrangement of the backing. In one embodiment, the courses 102 are alternately threaded into each link in warp knit 1. As shown in fig. 3, the links formed by braiding the looped fibers 101 are connected one to the other, with a length region of one link P between the two broken lines. In braiding, the warp bushings 102 may pass through the annular openings from each link, forming an alternating pattern. In addition, the bushing 102 may be interspersed once every other link, such as once every two or three links.

As other embodiments, the stitch points of the bushing 102 through the links are the nodes of the links. Typically, when the diameter of the backing 102 is substantially greater than the looped fibers 101, the backing 102 passes through the annular opening; when the radial dimensions of the two are equal, the two can pass through the annular opening or the node.

In combination with the above embodiments, as shown in fig. 1 and 4, the connecting wires 2 are connected between two adjacent warp knitting yarns 1 in a zigzag shape, and the connecting points on both sides of the same warp knitting yarn are staggered. In some embodiments, a portion of the warp knit in the middle area of the strapped grass mesh may also be knit with a backing, the warp knit being unbuckled near both sides. Warp knitting with and without a backing may also be provided at intervals.

In some embodiments, the backing 102 may be a single fiber filament, or may be a combination of two or three fiber filaments; the loop-forming fibers 4 are single fiber filaments. The fiber filaments adopted in the method are all formed after film extrusion and cutting.

In other embodiments, the backing 102 may also be cut into individual flat fiber filaments and then folded or wound to form the backing 102. This increases the number of steps and increases the cost.

As other embodiments of the knitted net, the connecting line 2 between the warp knitting 1 and the warp knitting 1 is comprised of the chain links formed by knitting the loop forming fiber 101 in series, and the chain links comprise three strands of threads formed by looping the loop forming fiber 101. Warp knitting 1 further includes warp courses 102, wherein warp courses 102 are interposed in the radial direction in the links in a substantially straight condition.

The stretching ratio of the adopted looping fiber 101 is larger than that of the lining warp 102, and the stretching ratio of the looping fiber 101 to the lining warp 102 is 1.4-2.2. Preferably can be controlled between 1.4 and 1.75, for example 1.48, 1.52, 1.64. The ratio of denier a to warp denier C of the looped fibers 101 in this example is b, with b ranging from 0.2 to 0.8. The embodiment controls the denier and the stretch ratio simultaneously, thereby providing basis for selecting loop forming fibers and interlining, and the woven grass-binding net has higher comprehensive strength.

In various embodiments, the looped fibers 101 and the backing 102 may be formed by film extrusion shredding, or may be formed as monofilaments in other ways.

When the grass bundling net is processed, a heating module can be arranged on the film cutting and wire dividing device, and the stretching rate of the looped fibers or the lining warp can be directly adjusted by using the heating module, so that the grass bundling net described in the embodiment above is obtained.

The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.

Claims

1. A woven mesh comprises a plurality of warp knitting yarns (1) which are radially arranged, wherein two adjacent warp knitting yarns (1) are connected through a connecting wire (2); the warp knitting (1) is formed by serially connecting chain links woven by looping fibers (101), and is characterized in that:

at least part of the warp knitting (1) further comprises warp courses (102), the warp courses (102) being in a substantially straight state, interspersed in a radial direction in the links;

the stretching ratio of the adopted looped fibers (101) is larger than that of the interlining (102), and the stretching ratio of the looped fibers (101) to the interlining (102) is in the range of 0.85-1.25a relative to the nominal stretching ratio a;

wherein the stretch ratio refers to the ratio between the stretch ratio at break of the looped fibers (101) and the stretch ratio at break of the backing (102).

2. The mesh grid of claim 1, wherein: the range of the nominal stretch ratio a is 1.45-1.58.

3. The mesh grid of claim 2, wherein: the value of the nominal stretch ratio a is 1.5.

4. The mesh grid of claim 1, wherein: the tensile proportion of the looped fibers (101) to the backing warp (102) is 1.4-1.7.

5. A mesh grid according to any one of claims 1-3, wherein: the ratio of denier a to denier C of the looped fibers (101) is b, said b being 0.13-0.55a relative to nominal draw ratio a.

6. The mesh grid of claim 5, wherein: the warp knitting (1) has a total denier of 900-1300 denier.

7. The mesh grid of claim 5, wherein: the denier of the connecting wire (2) is not greater than the denier of the looped fibers (101).

8. The mesh grid of claim 1, wherein: the warp threads (102) are alternately arranged in each chain link in the warp knitting (1).

9. The mesh grid of claim 8, wherein: the stitch points of the bushing (102) passing through the links are annular openings of the links, or nodes of the links.

10. The mesh grid of claim 8, wherein: the connecting lines (2) are connected between two adjacent warp knitting machines (1) in a zigzag mode.

11. The mesh grid of claim 1, wherein: the lining (102) is formed by combining a single fiber yarn or two or more fiber yarns; the loop forming fiber (4) is a single fiber yarn.

12. The mesh grid of claim 1, wherein: the backing (102) is formed by folding or winding single flat fiber filaments.

13. The knitted net comprises a warp knitting (1) and a connecting line (2) between the warp knitting (1), wherein the warp knitting (1) is formed by connecting chain links woven by loop forming fibers (101) in series, and the chain links comprise three threads formed by encircling the loop forming fibers (101); the method is characterized in that:

the warp knitting (1) further comprises warp courses (102), the warp courses (102) being in a substantially straight state, interspersed in a radial direction in the links;

the stretching rate of the adopted looped fibers (101) is larger than that of the interlining (102), and the stretching proportion of the looped fibers (101) to the interlining (102) is 1.35-1.70; wherein the stretch ratio refers to the ratio between the stretch ratio at break of the looped fibers (101) and the stretch ratio at break of the backing (102).

14. The mesh grid of claim 13, wherein: the ratio of denier a to warp denier C of the looped fiber (101) is b, the b value ranging from 0.2 to 0.7.

15. The mesh grid of claim 13, wherein: the loop-forming fibers (101) and the lining warp (102) are formed by adopting film extrusion and shredding.

16. The knitted net comprises a warp knitting (1) and a connecting line (2) between the warp knitting (1), wherein the warp knitting (1) is formed by connecting chain links woven by loop forming fibers (101) in series, and the chain links comprise three threads formed by encircling the loop forming fibers (101); the method is characterized in that:

the elongation of the loop fibers (101) used is greater than that of the warp (102) so that the elongation of the knitted links is similar to that of the warp (102).