Latticed raschel net and method for producing same

Abstract

[Problem] To provide: a latticed Raschel net that has excellent strength in longitudinal and lateral directions; and a method for producing the same. [Solution] The present invention is a latticed Raschel net 10 in which a plurality of longitudinal fiber bodies 1 disposed at a fixed interval and a plurality of lateral fiber bodies 2 disposed at a fixed interval are arranged in a lattice shape. In the latticed Raschel net 10, the longitudinal fiber bodies 1 are chain knitted structures having longitudinal fiber loops 1a continuous in the longitudinal direction, and the lateral fiber bodies 2 are chain knitted structures having lateral fiber loops 2a continuous in the lateral direction.

Description

Lattice-shaped Russell net and its manufacturing method

[0001] The present invention relates to a lattice-shaped Russell net that has excellent strength in both the longitudinal and transverse directions and can be used for a variety of purposes, and a method for manufacturing the same.

[0002] Nets are used for a variety of purposes. For example, a fiber net is known that is stretched between support members such as poles or ropes, has a fine mesh portion disposed between the support members, and has a coarse mesh portion disposed at at least one end of the fine mesh portion, has a coarser mesh than the fine mesh portion, and allows the support member to pass through (see, for example, Patent Document 1). It is described that such fiber nets can be used for safety nets, fishing nets, and ball nets for catching small balls such as ping-pong balls and golf balls.

[0003] Also, as shown in FIG. 6, a net is commercially available in which the voids are formed in a diamond shape by twisting the threads.

[0004] Japanese Patent Application Laid-Open No. 2008-138517

[0005] The net described in Patent Document 1 and the net shown in Fig. 6 have a tendency to form diamond-shaped meshes in a lattice pattern only when stress is applied in the vertical and horizontal directions. However, these nets have threads formed in an oblique direction and crossing points in an X-shape, so when tension is applied, the strength in the vertical and horizontal directions is insufficient.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lattice-shaped Russell net having excellent strength in both the longitudinal and lateral directions (vertical and horizontal directions), and a method for manufacturing the same.

[0007] The inventors have conducted extensive research to solve the above-mentioned problems and have found that the above-mentioned problems can be solved by making the longitudinal fiber filaments and the weft fiber filaments arranged in a lattice pattern both of a chain knit structure having continuous fiber loops, thereby completing the present invention.

[0008] The present invention relates to a lattice-shaped Russell net having a plurality of vertical fiber filaments arranged at regular intervals and a plurality of horizontal fiber filaments arranged at regular intervals, the vertical fiber filaments having a chain stitch structure with vertically continuous vertical fiber loops, and the horizontal fiber filaments having a chain stitch structure with horizontally continuous horizontal fiber loops. In the lattice-shaped Russell net of the present invention, it is preferable that the chain stitch structure is knitted by Russell knitting.

[0009] In the lattice-shaped Russell net of the present invention, it is preferable that the vertical fiber filaments have vertical connecting loop portions between successive vertical fiber loops for connecting to the horizontal fiber filaments, and the horizontal fiber filaments have horizontal connecting loops between successive horizontal fiber loops for connecting to the vertical fiber filaments, and the vertical connecting loop portions and the horizontal connecting loop portions interlock with each other at the intersections where the vertical fiber filaments interlock with the horizontal fiber filaments. More specifically, it is preferable that the vertical connecting loop portion consists of two loops, a successive upper vertical connecting loop and a lower vertical connecting loop, and the horizontal connecting loop portion is a single loop having a first thread portion and a second thread portion, and the upper vertical connecting loop interlocks with the first thread portion and the lower vertical connecting loop interlocks with the second thread portion.

[0010] In the lattice-shaped Russell net of the present invention, the yarns constituting the warp fiber filaments and / or the yarns constituting the weft fiber filaments are preferably made of heat-fusible synthetic yarns, and the heat-fusible synthetic yarns are preferably hardened by heat treatment.

[0011] The lattice-shaped Russell net of the present invention is preferably used as a fishing net.

[0012] The present invention is a method for manufacturing a lattice-shaped Russell net, which comprises a first step of knitting horizontal fiber filaments by Russell knitting in advance, a second step of knitting vertical fiber filaments by Russell knitting, and a third step of knitting the vertical fiber filaments by Russell knitting and inserting horizontal fiber filaments horizontally at regular intervals.

[0013] The present invention is a method for manufacturing a lattice-shaped Russell net, which includes a first step of knitting horizontal fiber filaments using Russell knitting in advance, a second step of knitting vertical fiber filaments using Russell knitting, a third step of knitting the vertical fiber filaments using Russell knitting and inserting horizontal fiber filaments at regular intervals, and a fourth step of performing heat treatment to harden the heat-fusible synthetic yarn.

[0014] The lattice-shaped Russell net of the present invention has vertical and horizontal fiber filaments arranged in a lattice pattern, so there is no need to stretch it and apply excessive stress in the vertical and horizontal directions in order to change the diamond pattern into a lattice pattern. Furthermore, since the vertical and horizontal fiber filaments are arranged in a lattice pattern, the net has excellent strength in both the vertical and horizontal directions.

[0015] In the lattice-shaped Russell net of the present invention, the vertical fiber filaments have continuous vertical fiber loops, and the horizontal fiber filaments have continuous horizontal fiber loops, and both are chain-stitched, so that the net has flexibility, and since they are laid across the entire width in the vertical and horizontal directions, it can exhibit sufficient strength. Furthermore, in the lattice-shaped Russell net, by knitting the chain-stitched structure with Russell knitting, the fiber density becomes denser, so that the net has even greater strength while maintaining a certain degree of flexibility.

[0016] Furthermore, because the lattice-shaped Russell net has a lattice shape, there is no limit to the vertical length, and the horizontal length can be up to about 15 m, making it possible to produce a suitable size. Incidentally, since the diamond-shaped voids are formed at an angle, the vertical and horizontal lengths are limited when the net is unfolded in a lattice shape. For this reason, it is particularly difficult to produce a wide and long net. Furthermore, because the resulting lattice-shaped Russell net has a lattice shape, unlike diamond-shaped nets, it is possible to provide ears on the edges, for example, by simultaneously knitting.

[0017] In the lattice-shaped Russell net of the present invention, by interlocking the vertical connecting loops with the horizontal connecting loops at the intersections, it is possible to extremely strongly connect the vertical fiber filaments and the horizontal fiber filaments at the intersections. Furthermore, by interlocking the upper vertical connecting loops with the first thread portions and the lower vertical connecting loops with the second thread portions, a stronger knot is formed, which reliably prevents the vertical fiber filaments from shifting vertically or horizontally relative to the weft filaments. This also has the advantage that the knots do not clearly protrude.

[0018] In the lattice-shaped Russell net of the present invention, the yarns constituting the warp fiber filaments and / or the yarns constituting the weft fiber filaments are made of heat-fusible synthetic yarns, so that the heat-fusible synthetic yarns can be hardened depending on the application, thereby making it possible to harden both the warp fiber filaments and the weft fiber filaments, or to harden either the warp fiber filaments or the weft fiber filaments.

[0019] As described above, the lattice-shaped Russell net of the present invention has a lattice shape and has sufficient strength in both the vertical and horizontal directions, so it can be suitably used as a fishing net that is large in area and requires high strength.

[0020] The method for manufacturing a lattice-shaped Russell net of the present invention can be easily realized by using a Russell knitting machine for the first, second, and third steps. The first, second, and third steps all have in common that they are knitted using Russell knitting, and the third step simply requires the addition of an operation to insert weft fiber filaments to the second step. Therefore, this method for manufacturing a lattice-shaped Russell net allows for inexpensive and relatively easy manufacturing of the lattice-shaped Russell net. In addition, the fourth step allows for hardening of the thermoplastic fibers.

[0021] FIG. 1 is a schematic plan view showing a lattice-shaped Russell net according to this embodiment. FIG. 2(a) is a schematic plan view showing an enlarged portion of the lattice-shaped Russell net shown in FIG. 1, and FIG. 2(b) is a schematic plan view showing the transverse fiber filaments of the lattice-shaped Russell net shown in FIG. 2(a). FIG. 3(a) is a structure diagram of an intersection in a manufacturing method of a lattice-shaped Russell net according to this embodiment, and FIG. 3(b) is a stitch diagram of an intersection in a manufacturing method of a lattice-shaped Russell net according to this embodiment. FIG. 4 is a flow chart showing a manufacturing method of a lattice-shaped Russell net according to this embodiment. FIG. 5 is a photograph showing a lattice-shaped Russell net manufactured by the manufacturing method of a lattice-shaped Russell net according to this embodiment. FIG. 6 is a photograph showing a conventional net.

[0022] Preferred embodiments of the present invention will be described in detail below, with reference to the drawings as necessary. In the drawings, identical elements are designated by the same reference numerals, and duplicate explanations will be omitted. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to those shown.

[0023] Fig. 1 is a schematic plan view showing a lattice-shaped Russell net according to this embodiment. As shown in Fig. 1, the lattice-shaped Russell net 10 according to this embodiment is composed of a plurality of vertical fiber filaments 1 arranged horizontally at regular intervals and a plurality of horizontal fiber filaments 2 arranged vertically at regular intervals. That is, the lattice-shaped Russell net 10 has the vertical fiber filaments 1 and horizontal fiber filaments 2 arranged across the entire width and perpendicular to each other to form a lattice shape. The lattice may be square or rectangular.

[0024] Here, the vertical fiber filaments 1 are filaments made of fiber extending vertically, and the horizontal fiber filaments 2 are filaments made of fiber extending horizontally. The constant interval between the vertical fiber filaments 1 is preferably, for example, 1 to 10 cm, and the constant interval between the horizontal fiber filaments 2 is preferably, for example, 1 to 10 cm. It is more preferable that both intervals are the same (the grid is square).

[0025] In the lattice-shaped raschel net 10, the vertical fiber filaments 1 and the horizontal fiber filaments 2 are made of fiber. Therefore, the lattice-shaped raschel net 10 has excellent flexibility and can be bent or wound into a roll. As will be described later, when the vertical fiber filaments 1 and the horizontal fiber filaments 2 are made of heat-fusible synthetic yarn, the lattice-shaped raschel net 10 before heat treatment has excellent flexibility.

[0026] Therefore, the lattice-shaped Russell net 10 can be used for a variety of purposes as a replacement for conventional nets (netting), such as safety nets, animal-proof nets, bird-proof nets, agricultural nets, livestock nets, fishing nets, shark-proof nets, etc. Among these, the lattice-shaped Russell net 10, being lattice-shaped and having excellent strength in both the vertical and horizontal directions, can be suitably used as a fishing net that has a large area and requires a certain level of strength.

[0027] In the lattice-shaped Russell net 10, the yarns constituting the warp fiber filaments 1 and the weft fiber filaments 2 are not particularly limited, but examples thereof include natural fibers such as cotton, hemp, linen, wool, cashmere, silk, and jute; synthetic fibers such as polyester, polyamide, polyurethane, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride, polypropylene, polyethylene, and polystyrene; and blended fibers obtained by blending different types of these fibers. The yarns constituting the warp fiber filaments 1 and the weft fiber filaments 2 may be the same type or different types. The yarns constituting the warp fiber filaments 1 and the weft fiber filaments 2 can be selected depending on the application. Among these, from the viewpoints of strength, durability, and versatility, it is preferable that the yarns constituting the warp fiber filaments 1 and the weft fiber filaments 2 be synthetic fibers.

[0028] Furthermore, heat-fusible synthetic yarns can also be used as such synthetic fibers. That is, heat-fusible synthetic yarns can be used as the yarns constituting the warp fiber filaments 1 and / or the weft fiber filaments 2. In this case, the heat-fusible synthetic yarns can be hardened by heat treatment. When using the fiber filaments as a replacement for conventional wire mesh, it is sufficient to use heat-fusible synthetic yarns for both the warp fiber filaments 1 and the weft fiber filaments 2 and harden them. When a strength intermediate between that of wire mesh and fibers is desired, or when the fiber filaments are to be wound for storage or transportation, it is sufficient to use heat-fusible synthetic yarns for one of the warp fiber filaments 1 and the weft fiber filaments 2 and harden only the heat-fusible synthetic yarns.

[0029] Here, examples of heat-fusible synthetic yarns include yarns (filaments) made of thermoplastic fibers such as polyester fibers, polyamide fibers (nylon), polyethylene fibers, polypropylene fibers, etc. Among these, it is more preferable to use polyester fibers, which are highly versatile and strong, and it is even more preferable to use polyester fibers with a core-sheath structure in which a high-melting-point polyester is arranged in the core and a low-melting-point polyester is arranged in the sheath (for example, product name: Melset (registered trademark)).

[0030] The warp fiber filaments 1 and / or the weft fiber filaments 2 are knitted in a chain stitch using multifilament yarns (bundles of yarns). Note that the thermoplastic multifilament yarns are freely deformable before heat treatment, but by applying heat treatment, the multifilaments are fused together and integrated, so that the yarns are hardened in the shape they had at the time of heat treatment.

[0031] In the lattice-shaped Russell net 10, the fineness of the multifilament yarns constituting the warp fiber filaments 1 and the weft fiber filaments 2 is preferably 500,000 to 80,000 dtex. This provides sufficient strength. The yarns may be raw silk or processed yarn.

[0032] Fig. 2(a) is a schematic plan view showing an enlarged portion of the lattice-shaped Russell net shown in Fig. 1, and Fig. 2(b) is a schematic plan view showing the weft fiber filaments of the lattice-shaped Russell net shown in Fig. 2(a). As shown in Fig. 2(a), in the lattice-shaped Russell net 10, the warp fiber filaments 1 and the weft fiber filaments 2 are both in a chain knit structure knitted so that loops are continuous. Note that both the warp fiber filaments 1 and the weft fiber filaments 2 are knitted by Russell knitting using a Russell knitting machine. The warp fiber filaments 1 and the weft fiber filaments 2 are connected to each other at intersections 3 where they intersect.

[0033] The lattice-shaped Russell net 10 has a chain knit structure, and therefore is flexible and can exhibit sufficient strength. In addition, since the lattice-shaped Russell net 10 is knitted by Russell knitting, the fiber density is denser, and the net has excellent strength while maintaining a certain degree of flexibility.

[0034] 2(b), the weft fiber filament 2 has horizontally continuous loops (hereinafter also referred to as "weft fiber loops") 2a made of fibers, and connecting loops (hereinafter also referred to as "weft connecting loops") 2b provided between the continuous weft fiber loops 2a. That is, the weft yarn filament 2 has a configuration in which the horizontal connecting loops 2b are formed at regular intervals among the continuous weft fiber loops 2a.

[0035] In the transverse fiber filament 2, the transverse fiber loops 2a form a group of continuously connected transverse fiber loops. The number of transverse fiber loops 2a in one group of transverse fiber loops sandwiched between the transverse connecting loops 2b is preferably 3 to 30, from the viewpoint of a balance between weight reduction and strength. The length A1 of the transverse fiber loops 2a in the longitudinal direction is preferably 1 to 20 mm. The longitudinal length A1 of the transverse fiber loops 2a refers to the length A1 from the intersection with the transverse fiber loop 2a on one side to the intersection with the transverse fiber loop 2a on the other side, among the adjacent transverse fiber loops 2a on both sides. The width A2 of the transverse fiber loops 2a is preferably 1 to 20 mm.

[0036] In the transverse fiber filaments 2, the transverse connecting loops 2b are loops for connecting to the longitudinal fiber filaments 1. The length and width of the transverse connecting loops 2b are the same as the length A1 and width A2 of the transverse fiber loops 2a.

[0037] The horizontally connected loop 2b is a single loop having a first yarn portion 2b1 on one side and a second yarn portion 2b2 on the other side. That is, the horizontally connected loop 2b is formed by the first yarn portion 2b1 carrying the upper semicircular arc portion and the second yarn portion 2b2 carrying the lower semicircular arc portion, forming a loop shape. Incidentally, the first yarn portion 2b1 and the second yarn portion 2b2 are knitted using a raschel knitting method and are therefore made of the same yarn.

[0038] 2(a), the vertical fiber filament 1 has loops 1a (hereinafter also referred to as "vertical fiber loops") made of continuous fibers in the vertical direction, and loop portions 1b (hereinafter referred to as "vertical connecting loop portions") provided between the continuous vertical fiber loops 1a for connecting them. That is, the vertical thread filament 1 has a configuration in which the vertical connecting loop portions 1b are inserted at regular intervals in the continuous vertical fiber loops 1a.

[0039] In the vertical fiber filament 1, the vertical fiber loops 1a form a continuous vertical fiber loop group. From the viewpoint of a balance between weight reduction and strength, the number of vertical fiber loops 1a in one vertical fiber loop group sandwiched between the vertical connecting loop portions 1b is preferably 3 to 30. Furthermore, the number of vertical fiber loops 1a in the vertical fiber loop group is preferably the same as the number of horizontal fiber loops 2a in the horizontal fiber loop group. The length and width of the vertical fiber loops 1a are the same as the length A1 and width A2 of the horizontal fiber loops 2a.

[0040] In the vertical fiber filaments 1, the vertical connecting loop portions 1b are portions for connecting to the horizontal fiber filaments 2. The length and width of the vertical connecting loops 1b are the same as the length A1 and width A2 of the horizontal fiber loops 2a.

[0041] The vertically connecting loop portion 1b consists of two loops: an upper vertically connecting loop 1b1 that is continuous with the upper side, and a lower vertically connecting loop 1b2 that is located directly below the upper vertically connecting loop 1b1. Note that the single loop that constitutes the vertical fiber loop 1a, the upper vertically connecting loop 1b1, and the lower vertically connecting loop 1b2 all have the same structure.

[0042] In the lattice-like Russell net 10, the transverse connecting loops 2b of the transverse fiber filaments 2 are connected to the longitudinal connecting loop portions 1b of the longitudinal fiber filaments 1 at the intersections 3 where the longitudinal fiber filaments 1 and the transverse fiber filaments 2 intersect. Specifically, the upper vertical connecting loops 1b1 of the longitudinal connecting loop portions 1b are interlocked with the first thread portions 2b1 of the transverse connecting loops 2b, and the lower vertical connecting loops 1b2 of the longitudinal connecting loop portions 1b are interlocked with the second thread portions 2b2 of the transverse connecting loops 2b. This ensures a strong connection between the longitudinal fiber filaments 1 and the transverse fiber filaments 2 at the intersections 3, and prevents the longitudinal or transverse displacement of the longitudinal fiber filaments 1 relative to the transverse fiber filaments 2.

[0043] As described above, the lattice-shaped Russell net 10 can be manufactured using a Russell knitting machine. Fig. 3(a) is a structure diagram of an intersection in the manufacturing method of a lattice-shaped Russell net according to this embodiment, and Fig. 3(b) is a stitch diagram of an intersection in the manufacturing method of a lattice-shaped Russell net according to this embodiment. The lattice-shaped Russell net 10 is knitted based on the structure diagram shown in Fig. 3(a). Furthermore, the lattice-shaped Russell net 10 is knitted so as to have the stitches shown in Fig. 3(b).

[0044] Fig. 4 is a flow diagram showing a manufacturing method of a lattice-shaped Russell net 10 according to this embodiment. As shown in Fig. 4, the manufacturing method of the lattice-shaped Russell net 10 according to this embodiment includes a first step S1 of knitting the weft fiber filaments 2 by Russell knitting, a second step S2 of knitting the warp fiber filaments 1 by Russell knitting, a third step S2 of knitting the warp fiber filaments 1 by Russell knitting and inserting the weft fiber filaments 2 laterally at regular intervals, and a fourth step S4 of performing a heat treatment to harden the heat-fusible synthetic yarn, if necessary.

[0045] In the manufacturing method of the lattice-shaped raschel net 10, the first step S1, the second step S2, and the third step S3 are performed using a raschel knitting machine. The fourth step S4 is performed when the above-mentioned heat-fusible synthetic yarn is used as the yarn used for knitting. In the first step S1 and the second step S2, the warp fiber filaments 1 and the weft fiber filaments 2 are similarly manufactured by knitting using a raschel knitting method. In the first step S1 and the second step S2, so-called insert yarns are not used.

[0046] In the third step S3, the vertical fiber filaments 1 are knitted by raschel knitting. At this time, the horizontal fiber filaments 2 are used as so-called inserting yarns. Specifically, in the third step, the horizontal connecting loops 2b of the periodically inserted horizontal fiber filaments 2 are knitted so as to interlock with the vertical connecting loop portions 1b when the vertical fiber filaments 1 are knitted, thereby forming the intersections 3. That is, the third step S3 is performed consecutively to the second step S2. As a result, a lattice-like raschel net 10 is obtained in which the filaments are arranged in a straight line across the entire width in the vertical and horizontal directions (i.e., the entire width in the vertical and horizontal directions of the lattice-like raschel net).

[0047] As described above, the fourth step S4 is performed when a heat-fusible synthetic yarn is used as the yarn to be knitted. Such heating may be performed using a general heating device at a temperature at which at least a portion of the heat-fusible synthetic yarn melts. Cooling is then performed by air cooling or the like. Since the lattice-shaped raschel net 10 hardens in the shape it assumes when heated, it is preferable to form it into the desired shape before heating.

[0048] Figure 5 is a photograph showing a lattice-shaped Russell net manufactured by the manufacturing method of the lattice-shaped Russell net according to this embodiment. As shown in Figure 5, the manufacturing method of the lattice-shaped Russell net 10 includes a first step S1, a second step S2, and a third step S3, which allows the lattice-shaped Russell net 10 to be manufactured relatively easily and inexpensively. In addition, by including a fourth step S4, it is also possible to harden the lattice-shaped Russell net 10.

[0049] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

[0050] In the lattice-shaped Russell net 10 according to this embodiment, it is not necessarily necessary to use heat-fusible synthetic yarn.

[0051] In the lattice-shaped raschel net 10 according to this embodiment, selvage may be provided at the edges. Such selvage may be formed simultaneously with the raschel knitting, or may be formed by sewing separately.

[0052] The manufacturing method of the lattice-shaped Russell net 10 according to this embodiment includes a first step S1, a second step S2, a third step S3, and a fourth step S4, but the fourth step S4 may not be included.

[0053] The lattice-shaped Russell net of the present invention can be used as a net. The lattice-shaped Russell net of the present invention has high strength in both the vertical and horizontal directions and can be used as a substitute for conventional nets, and is particularly suitable for use as a fishing net.

[0054] 1...Vertical fiber filament 10...Grid-like Russell net 1a...Fiber loop (vertical fiber loop) 1b...Vertical connecting loop portion 1b1...Upper vertical connecting loop 1b2...Lower vertical connecting loop 2...Horizontal fiber filament 2a...Fiber loop (horizontal fiber loop) 2b...Horizontal connecting loop 2b1...First thread portion 2b2...Second thread portion 3...Intersection portion S1...First step S2...Second step S3...Third step S4...Fourth step

Claims

1. A lattice-like raschel net in which a plurality of vertical fiber filaments are arranged at regular intervals and a plurality of horizontal fiber filaments are arranged at regular intervals in a lattice pattern, wherein the vertical fiber filaments are of a chain-knit structure having vertically continuous vertical fiber loops, and the horizontal fiber filaments are of a chain-knit structure having horizontally continuous horizontal fiber loops.

2. A lattice-shaped raschel net according to claim 1, wherein said chain stitch structure is knitted by raschel stitching.

3. A lattice-like raschel net as described in claim 1, wherein the vertical fiber filaments have vertical connecting loop portions between adjacent vertical fiber loops for connecting with the horizontal fiber filaments, the horizontal fiber filaments have horizontal connecting loops between adjacent horizontal fiber loops for connecting with the vertical fiber filaments, and the vertical connecting loop portions and the horizontal connecting loop portions interlock with each other at the intersections where the vertical fiber filaments and the horizontal fiber filaments intersect.

4. A lattice-shaped Russell net as described in claim 3, wherein the vertical connecting loop portion is made up of two loops, a continuous upper vertical connecting loop and a lower vertical connecting loop, the horizontal connecting loop portion is a single loop having a first thread portion and a second thread portion, the upper vertical connecting loop is engaged with the first thread portion, and the lower vertical connecting loop is engaged with the second thread portion.

5. A lattice-like raschel net as described in claim 1, wherein the yarns constituting the warp fiber filaments and / or the yarns constituting the weft fiber filaments are made of heat-fusible synthetic yarns, and the heat-fusible synthetic yarns are hardened by heat treatment.

6. The lattice-shaped Russell net according to any one of claims 1 to 5, which is used as a fishing net.

7. A method for manufacturing a lattice-like raschel net as claimed in claim 3 or 4, comprising: a first step of knitting the horizontal fiber filaments by raschel knitting in advance; a second step of knitting the vertical fiber filaments by raschel knitting; and a third step of knitting the vertical fiber filaments by raschel knitting and inserting the horizontal fiber filaments horizontally at regular intervals.

8. A method for manufacturing a lattice-like raschel net as claimed in claim 5, comprising: a first step of knitting the horizontal fiber filaments in advance by raschel knitting; a second step of knitting the vertical fiber filaments by raschel knitting; a third step of knitting the vertical fiber filaments by raschel knitting and inserting the horizontal fiber filaments laterally at regular intervals; and a fourth step of carrying out a heat treatment to harden the heat-fusible synthetic yarn.

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