CN218711275U - Net warp knitting structure and straw binding net - Google Patents

Abstract

The utility model discloses a woven wire warp knitting structure and bundle grass net belongs to woven wire netting structure field. The warp knitting structure of the net knitting structure of the utility model is formed by connecting chain links knitted by looped fibers in series, and the chain links comprise three strands of silk threads formed by the looped fibers in a surrounding way; the warp knitting machine also comprises a lining warp which is in a substantially straight state and is inserted in the chain link along the radial direction; the stretching rate of the adopted loop-forming fibers is at least 10 percent higher than that of the lining warp, so that the difference between the stretching rate of the knitted chain link and the stretching rate of the lining warp is within 8 percent. Therefore, the looped fibers and the lining warps meeting the requirements are selected to meet the drawing proportion, the lining warps and the chain links in the woven warp knitting have similar drawing rates, the maximum tension can be exerted at the same time, and the comprehensive strength of the straw binding net is improved.

Description

Net warp knitting structure and straw binding net

Technical Field

The utility model relates to a mesh grid structure technical field, more specifically say, relate to a mesh grid warp knitting structure and bundle grass net.

Background

At present, after crop straws are harvested, most of the crop straws are bundled and packaged through a straw bundling net and then transported. A grass netting is a knotless net which is knitted using a warp knitting machine, typically formed by looping loops of fibre and attached with a weft thread. The structure of the grass binding net is characterized in that the meshes are large, and the grass binding net has certain bearing strength.

For a grass netting, it is generally required to have a sufficiently low weight in order to be able to achieve a correspondingly low material consumption, lower material costs. On the other hand, it is required to have a certain radial bearing force so that the straw can be rolled into a bag when being tied. To increase the load carrying capacity of each warp chain, there may be two methods. The strength of each bundle of looped fibers is improved, the toughness of the looped fibers is improved, and the weakening of the strength of the looped fibers caused by warp knitting, bending and looping is reduced. In the prior art, the improvement of the fiber strength has certain technical bottlenecks, and the weakening of the fiber strength by warp knitting into loops cannot be avoided. If the tenacity of the looped fibers is directly increased, the denier grammage of the looped fibers will be increased.

Therefore, the industry faces a major technical bottleneck, and once the strength is increased, the gram weight is inevitably increased. In order to solve this problem, the applicant has disclosed a solution: in the scheme, the warp-wise chain knitting chain is formed by compounding a warp knitting chain and a lining warp which is straightly lined in the warp knitting chain, the warp knitting chain is formed by connecting coil chain links which are formed by warp knitting of loop forming fibers in series, and the denier of the warp knitting chain is 3 times of the denier A of the loop forming fibers.

According to the scheme, the section loss is reduced as much as possible by changing the chaining structure, so that the strength is increased under the condition that the gram weight is not increased. However, in actual use, the lining warp and the looped fibers cannot be well matched, once the looped fibers or the lining warp are broken, the whole chain is broken, the comprehensive strength of the knitted net cannot reach the theoretical analysis strength, and the difference is large.

In the US patent 2020385902A1, although one warp is also provided, the warp is knotted, which reduces the strength.

In US10604874B2, a double-stranded structure is used, the double strands being connected by a connecting wire, which increases strength but also increases grammage.

Therefore, further analytical studies are needed to improve the overall strength at lower grammage.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

An object of the utility model is to overcome among the prior art the grass binding net be difficult to reach the not enough of great intensity under the lower unit grammes per square metre condition, provide a weave net warp knitting structure and grass binding net, through the chooseing for use control to looping fibre and lining warp, under the condition of lower grammes per square metre, promoted the holistic tensile strength of grass binding net.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model relates to a net-knitting warp-knitting structure, the warp-knitting is formed by connecting chain links knitted by loop-forming fibers in series, and the chain links comprise three strands of silk threads formed by the loop-forming fibers in a surrounding way; the warp knitting machine further comprises a lining warp, wherein the lining warp is in a substantially straight state and is inserted into the chain link along the radial direction; the method is characterized in that:

the stretching ratio of the adopted looped fibers is at least 20 percent greater than that of the lining warp, so that the difference between the stretching ratio of the knitted chain link and the stretching ratio of the lining warp is within 10 percent.

Further, the drawing rate of the looped fibers is not less than 65%; the drawing rate of the used lining warp is 55-68%, and the ratio of the drawing rate of the looped fibers to the drawing rate of the lining warp is 1.35-1.79.

Further, the cross section of the warp lining and the looped fiber is approximately circular or rectangular structure, and the cross section area of the warp lining is 1.4-2.5 times of that of the looped fiber.

Further, the total denier of the warp knitting is 900-1300 denier, and the ratio of the denier of the loop-forming fiber to the denier of the backing warp is 0.2-0.6.

Further, the denier of the looped fiber is not more than 250 denier, and the denier of the warp liner is not less than 280 denier.

The utility model discloses a straw binding net adopts foretell netting warp knitting structureTwo adjacent warp-knitted fabrics are connected by adopting connecting lines, and the gram weight of the grass binding net is 5.5g/m ² ～7.5g/m ² 。

Furthermore, the connecting lines are arranged in a zigzag manner, and the connecting points of the connecting lines and the warp knitting are annular openings of the chain links or nodes of the chain links.

Further, the distance between two adjacent warp knitting yarns is 2.0-8.0cm.

Further, the distance between two adjacent connecting points of the connecting line on the same warp knitting is 3.0-7.5cm.

Furthermore, the single yarns of the adopted loop-forming fibers, the lining warps and the wefts are all plastic flat yarns with approximately the same thickness.

Furthermore, the lining warp is formed by combining a single fiber yarn or two or more than two sub-lining warp fiber yarns; the looped fibers are single fiber yarns.

Furthermore, the length of the grass baling net is 3000-4000m, and the diameter is 21-26cm.

Further, part of the lining warps in the straw netting adopt fiber yarns with different colors from the looped fibers.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) The utility model discloses a weave net warp knitting structure, the percentage elongation to the lopping fibre that adopts and lining warp has carried out the restriction, then before the weaving, need adjust the lopping fibre with the percentage elongation of lining warp in advance, adopts the lopping fibre that has great percentage elongation, no longer heats or processing such as softening after weaving into the net in the weaving, directly become the net and beat a bundle, the lining warp has the percentage elongation similar to each other with the chain link in the warp knitting after weaving, can exert the biggest pulling force simultaneously, improves the comprehensive strength who bundles the grass net.

(2) The grass binding net of the utility model limits the gram weight and the warp knitting structure at the same time, so that under the condition that the unit gram weight of the grass binding net is lower, the chain links and the lining warps are distributed with larger strength, the section loss is reduced, and the cost is controlled; on the other hand, the stretching rate of the chain link and the lining warp is limited, and the maximum force intensity value of the chain link and the lining warp can be well exerted. By controlling the factors of gram weight and stretching ratio, the grass baling net can exert great economic value.

Drawings

FIG. 1 is a partial structure diagram of a grass baling net;

FIG. 2 is a schematic view of a warp knitted structure;

FIG. 3 is a schematic view showing the insertion of the warp and the chain link;

fig. 4 is a schematic view of the overall structure of the grass baling net.

The reference numbers in the schematic drawings illustrate:

1. warp knitting;

101. looping fibers;

102. lining warp;

2. a connecting wire;

3. a reel;

4. a grass binding net.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The structure, proportion, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions of the present invention, so that the present invention has no technical essence, and any structural modification, proportion relation change or size adjustment should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.

Fig. 1 shows a partial structure of a woven mesh, and the up-down direction of the paper in fig. 1 is a warp direction, and the left-right direction is a weft direction. The woven mesh shown in fig. 1 comprises a plurality of warp-knitted fabrics 1 arranged radially, and two adjacent warp-knitted fabrics 1 are connected through connecting lines 2. The warp knitting 1 is formed by connecting annular chain links one by one in series, the chain links are formed by circularly knitting loop forming fibers 101, and each chain link is wound by the loop forming fibers 101 connected in series to form three strands of silk yarns.

The warp-knitted structure in this embodiment can be seen in particular in fig. 2, each link having three filaments in the horizontal direction, which filaments are formed by the same looped fibres. The mesh grid at least partially comprises a warp padding 102, the warp padding 102 being substantially flat and being inserted in the chain links in a radial direction. As an implementation manner, each warp knitting 1 may adopt a structure with the warp padding 102.

In an embodiment, the warp knit and the inlay warp in a substantially flat condition share the load-bearing load in the warp direction. It should be understood that "straight" of the lining warp is relative to the bending chaining structure of the looped fibers, the lining warp is in the lining structure vertical to the mesh surface of the knitted net, and the proper bending formed by the lining warp passing through the loop chain links alternately up and down in the vertical direction also belongs to the meaning of "straight" or "approximately straight". That is, the flat condition does not require that it be absolutely straight when deployed, allowing some bending, but must be able to share the meridional loads when in use.

It should be noted that the stretch ratio of the looped fibers 101 used in this embodiment is at least 10% greater than that of the warp padding 102, and may be, for example, 25%, 30%, 40%, or the like, and is generally controlled to be within 45%, so that the difference between the stretch ratio of the knitted links and the stretch ratio of the warp padding 102 is within 8%. The drawing ratio herein means a percentage of a length of the filament, which is generated by drawing when the filament is broken by an external force, to an original length.

As another embodiment, the stretch ratio of the looped fibers 101 may be controlled to be not less than 65%; the drawing rate of the used lining warp 102 is 55-68%, the ratio of the drawing rate of the looped fibers 101 to the drawing rate of the lining warp 102 is controlled within the range of 1.35-1.79, and the drawing rate of the looped fibers is about 28-40% higher than that of the lining warp.

According to analysis, currently, the selection of the warp and loop forming fibers mainly considers the grammage and the strength, and the strength loss of the loop forming fibers during loop forming, but neglects the change of the wire drawing rate, thereby causing the whole strength to not reach the ideal value.

For example, the strength of the looped fibers is chosen to be N, and after the loop is woven, there will be a 30% -40% break, for example 40%, the actual link strength will be 3 x 0.6N. The strength of the warp was q, and since the warp was in a flat state, it was considered that there was no strength loss. The theoretical value of the warp knitting strength Q consisting of looped fibers and underwires should be Q =3 × 0.6n + Q.

The above calculation method is the main method for calculating the total strength by using the weaving mode at present. Actually, the 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. When the strength of the chain link is added to the strength of the lining warp, a precondition is that the elongation of the chain link and the lining warp is the same, that is, the chain link and the lining warp can reach the maximum strength value after being elongated to a certain length, otherwise, the chain link and the lining warp cannot be effectively matched. Most of the current methods ignore the effect of elongation.

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

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

The ideal value is to control the loop forming fiber and the lining warp in warp knitting to have similar stretching ratio, but after the loop forming fiber is knitted into chain links, the loop forming fiber is subjected to stress concentration at the joints of the chain links, so that the warp knitting is broken, and the elongation of the warp knitting is greatly different from the theoretical value.

In other methods, the warp knitting is heated or softened in other modes after the net is formed, and the tensile rate of the chain links and the lining warp is adjusted to be similar, so that the comprehensive strength of the chain links and the lining warp can be ensured to be exerted. Although this treatment method can obtain a similar elongation, it has various problems. On one hand, after heating, the strength of the looped fibers and the lining warps is influenced, and how to control the heating mode is complex; on the other hand, extra heating equipment is needed for heating after the net is woven into a net, the existing field space and the packaging mode need to be adjusted, the cost is high, and the purpose of low-cost production is violated.

In this embodiment, as long as the elongation of one of the filaments is known, another filament having a corresponding elongation may be selected. Of course, the yarns can be adjusted before weaving into the net according to the strength requirement, so that the yarns with the corresponding stretching ratio can be obtained and then woven, and the cost is controllable.

In one embodiment, the warp knit 1 formed by the looped fibers 101 and the warp inserts 102 has a total denier of 900 to 1300 denier and the ratio of the denier of the looped fibers to the denier of the warp inserts is 0.2 to 0.6. Further, the denier of the looped fiber 101 is not more than 250 denier, and the denier of the warp liner 102 is not less than 280 denier. The loop forming fiber and the lining warp are selected in the range, or parameters of the loop forming fiber and the lining warp are determined in the mode, so that the warp knitting structure meeting the requirement is produced.

The cross-section of the warp (102) and looped fibers 101 in each of the above embodiments is generally circular or rectangular in configuration, and in some embodiments, the cross-sectional dimensions of both may be the same. More preferably, the cross-sectional area of the warp liner 102 is 1.4 to 2.5 times the cross-sectional area of the looped fiber 101. If the warp liner 102 and the looped fibers 101 are both flat filaments formed by film cutting, the cross section is of a quasi-rectangular structure, and when the thicknesses are consistent, the area ratio is the same as the width ratio. If monofilaments are used, the cross-section may be of circular configuration, and the area ratio may be controlled within this range.

The straw binding net disclosed by the embodiment is combined with the warp-knitted structure, and has stronger comprehensive tensile strength. As a further limitation, two adjacent warp knitted fabrics 1 are connected by a connecting line 2, and the gram weight of the grass binding net is 5.5g/m ² ～7.5g/m ² 。

For the unit square gram weight of the grass binding net, 1 meter can be cut from a rolled grass binding net product, the gram weight m of the grass binding net with the length of 1 meter is weighed, and then the unit square gram weight is obtained by dividing the unit square gram weight by the latitudinal width W of the grass binding net; alternatively, the net roll dry weight M may be divided by the web width W in the weft direction and then by the total length of the grass netting to obtain the total length L of the grass netting.

As a further preferred embodiment, the grammage of the grass netting can be controlled to 5.5g/m ² ～6.5g/m ² E.g. can be designed as 6g/m ² 、6.5g/m ² And the like. Referring to fig. 4, the length L of the grass net 4 wound on the central reel 3 is 3500 to 4500 ± 50m, such as 3500 ± 50m, 4000 ± 50m, 4500 ± 50m, etc. Generally, when the length L of the grass baling net is 3500 to 4500 + -50 m, the latitudinal width W of the grass baling net is preferably 1.4m or less, and when the latitudinal width W of the grass baling net is 1.4m or more, the length L of the grass baling net is preferably 3000 to 3500 + -50 m, so that the weight of the whole roll of grass baling net is ensured to be moderate and is more acceptable to users.

In other embodiments, it may also be defined that the denier of the connecting filament 2 is not greater than the denier of the looped fiber 101. The main function of the connection line 2 is to connect a plurality of warp braids without taking up the warp load, so that its denier can be controlled within a relatively small range.

There are various implementation structures for the specific arrangement of the warp liner. In one embodiment, the warp inserts 102 are alternately inserted through each link in warp knit 1. As shown in fig. 3, the links formed by the loop forming fibers 101 are connected one by one, and a length region of one link P is between two dotted lines. During weaving, the warp threads 102 may pass through the annular openings from each link, forming an alternating pattern of interpenetration. In addition, the warp threads 102 may also be interspersed every other link, such as two or three links apart.

In other embodiments, the stitch point where the warp runner 102 passes through a link is the node point of the link. Generally, when the diameter of the warp liner 102 is significantly larger than that of the looped fiber 101, the warp liner 102 passes through the annular opening; when the two radial dimensions are the same, the two radial dimensions can pass through the annular opening and also can pass through the node.

With reference to the above embodiments, as shown in fig. 1 and 4, the connecting lines 2 are connected between two adjacent warp-knitted fabrics 1 in a zigzag manner, the connecting points of the connecting lines 2 and the warp-knitted fabrics 1 are the annular openings of the chain links, or the nodes of the chain links, and the connecting points on two sides of the same warp-knitted fabric are staggered. In some embodiments, partial warp knitting with warp padding can be arranged in the middle area of the grass netting, and warp knitting without warp padding is arranged on the two sides. Warp knitting with lining warp and warp knitting without lining warp can be arranged at intervals.

Further, the distance between two adjacent warp knitted fabrics 1 is 2.0-8.0cm, such as 3cm, 5cm, 6cm, and the distance between two adjacent connection points of the connecting line 2 on the same warp knitted fabric 1 is 2.0-7.5cm, such as 3.0cm, 3.5cm, 5.0cm, 6.0cm, etc. The monofilament of the looped fibers, the monofilament of the warp padding and the monofilament of the weft are plastic flat filaments, the thicknesses of the plastic flat filaments are approximately the same, the width of the monofilament of the looped fibers and the width of the monofilament of the weft are 0.8 +/-0.2 mm, and the width of the monofilament of the warp padding is 1.5 +/-0.2 mm.

In some embodiments, the warp threads 102 may be a single filament, or a combination of two or three filaments; the looped fibers 4 used are individual filaments. The fiber filaments used herein are those formed by extrusion film cutting.

In other embodiments, the warp liner 102 may be cut into a single flat filament and then folded or wound to form the warp liner 102. This increases the number of steps and the cost.

Other embodiments of the knitted net include 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 knitted by loop-forming fibers 101 in series, and the chain links include three strands of silk threads formed by the loop-forming fibers 101 in a surrounding manner. The warp knitting machine 1 further comprises a warp padding 102, wherein the warp padding 102 is in a substantially straight state and is inserted in the chain link along the radial direction.

In various embodiments, the looped fibers 101 and the backing yarns 102 may be formed by extruding or shredding, or may be formed into monofilaments in other manners. The partial warp padding of the grass binding net can also adopt fiber filaments with different colors from the looped fibers, so that the visual effect can be enhanced, or the installation direction of the grass binding net can be conveniently selected.

When the straw-tying net is processed, a heating module may be provided on the film-cutting and filament-separating device, and the heating module may be used to directly adjust the stretching ratio of the looped fibers or the warp threads, so as to obtain the straw-tying net described in the above embodiments.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (13)

1. A mesh-knitting warp-knitting structure is characterized in that a warp knitting (1) is formed by connecting chain links knitted by loop-forming fibers (101) in series, and each chain link comprises three strands of silk yarns formed by the loop-forming fibers (101) in a surrounding mode; the warp knitting machine (1) further comprises a lining warp (102), wherein the lining warp (102) is in a substantially straight state and is inserted in the chain link along the radial direction; the method is characterized in that:

the stretching ratio of the looped fibers (101) is at least 20% greater than that of the lining warps (102), and the difference between the stretching ratio of the chain links and the stretching ratio of the lining warps (102) is within 10%.

2. The netting warp knit structure of claim 1, wherein: the stretching rate of the looped fibers (101) is not lower than 65%; the drawing rate of the used lining warp (102) is 55-68%, and the ratio of the drawing rate of the looped fibers (101) to the drawing rate of the lining warp (102) is 1.35-1.79.

3. The netting warp knit structure of claim 2, wherein: the cross section of the lining warp (102) and the looped fiber (101) is approximately in a circular or rectangular structure, and the cross section area of the lining warp (102) is 1.4-2.5 times of that of the looped fiber (101).

4. A braided warp knitted structure according to any one of claims 1 to 3, characterised in that: the total denier of the warp knitting (1) is 900-1300 denier, and the ratio of the denier of the loop-forming fiber to the denier of the back warp is 0.2-0.6.

5. The netting warp knit structure of claim 4, characterized in that: the denier of the looped fiber (101) is not more than 250 denier, and the denier of the warp liner (102) is not less than 280 denier.

6. A grass baling net, characterized in that: the netting warp-knitted structure according to any of claims 1 to 5, wherein two adjacent warp-knitted structures (1) are connected by connecting lines (2), and the grammage of the grass-tying net is 5.5g/m ² ～7.5g/m ² 。

7. A grass netting according to claim 6, characterized in that: the connecting lines (2) are arranged in a zigzag manner, and the connecting points of the connecting lines (2) and the warp knitting machine (1) are annular openings of chain links or nodes of the chain links.

8. A grass netting as claimed in claim 7, characterized in that: the distance between two adjacent warp knitting yarns (1) is 2.0-8.0cm.

9. A grass netting as claimed in claim 7, characterized in that: the distance between two adjacent connecting points of the connecting line (2) on the same warp knitting machine (1) is 3.0-7.5cm.

10. A grass netting according to claim 6, characterized in that: the used looped fibers (101), the warp threads (102) and the weft threads are all plastic flat threads with approximately same thickness.

11. The grass baling net of claim 6, wherein: the lining warp (102) is formed by combining a single fiber yarn or two or more than two sub-lining warp fiber yarns; the looped fibers (101) are single fiber filaments.

12. A grass netting according to claim 6, characterized in that: the length of the grass baling net is 3000-4000m, and the diameter is 21-26cm.

13. A grass netting according to claim 6, characterized in that: part of the lining warps (102) in the straw netting adopts fiber filaments with different colors from the looped fibers (101).

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