Method for knitting knitted fabric substrate and knitted fabric substrate

Abstract

Provided is a knitting method that is for a knitting base material and that provides a pattern representation using basting yarn in a knitting base material having a pattern, and therefore, does not affect the orientations of warp and weft, and thereby enables prevention of the occurrence of non-uniform strength.　The knitting method is for a knitting base material 1 including a plurality of layers of base materials 2 in which warp (first base yarn 10) and weft (second base yarn 20) made of reinforced fiber yarn intersect with each other, and a knitting yarn 3 that fixes the plurality of layers of materials 2 by knitted fabric. The method involves, when forming the knitted fabric, providing a pattern representation on a surface of the knitting base material 1 using the knitting yarn 3.

Description

[Technical field]

[0001] The present invention relates to a method for knitting a knitted fabric substrate and to a technique for knitted fabric substrates. [Background technology]

[0002] Conventionally, knitting methods and technologies for knitted fabric substrates have been publicly known, as described in Patent Document 1, for example.

[0003] Patent Document 1 discloses a knitted substrate that can be used for fiber-reinforced plastics. Specifically, Patent Document 1 discloses a knitted substrate that includes a substrate having multiple layers of warp yarns and weft yarns arranged in parallel in a predetermined direction, and a retaining yarn that fixes the multiple layers of the substrate with a knitted fabric. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2000-501792 Summary of the Invention [Problem to be solved by the invention]

[0005] In the knitted base material as described in Patent Document 1, it is possible to apply a pattern by partially changing the weaving method of the warp and weft threads. However, when the weaving method of the warp and weft threads is partially changed, there is a possibility that the fiber reinforced plastic formed using this knitted base material will have uneven strength due to the partial change in the weaving method.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a knitting method for a knitted fabric substrate and a knitted fabric substrate that can prevent the occurrence of uneven strength in a knitted fabric substrate having a pattern. [Means for solving the problem]

[0007] The problem to be solved by the present invention has been described above, and the means for solving this problem will now be described.

[0008] That is, the knitting method of the present invention is a knitting method of a knitted substrate comprising a substrate provided in a plurality of layers in which warp yarns and weft yarns made of reinforcing fiber yarns cross each other, and a retaining yarn for fixing the plurality of layers of substrates by a knitted fabric, and a pattern is expressed on the surface of the knitted substrate using the retaining yarn when the knitted fabric is formed. At least two kinds of knitting yarns are used for the retaining yarn, at least one kind of the knitting yarns functions to make the other knitting yarns stand out, and the at least one kind of the knitting yarns is a non-transparent yarn and has a property of becoming transparent or semi-transparent when the knitted base material is impregnated with a resin. It is something. With this configuration, in a knitted base material having a pattern, the pattern is expressed by the retaining yarn, so that the orientation of the warp and weft yarns is not affected and the occurrence of uneven strength can be prevented. In addition, the other knitting yarns can be emphasized, and thus a variety of patterns can be expressed. In addition, by making at least one type of knitting yarn among the retaining yarns less noticeable compared to the other knitting yarns, the other knitting yarns can be emphasized, and thus a variety of patterns can be expressed.

[0009] Also, A method for knitting a knitted base material comprising a base material in which multiple layers of warp yarns and weft yarns made of reinforcing fiber yarns are provided so as to cross each other, and a retaining yarn for fixing the multiple layers of the base material with a knitted fabric, wherein a pattern is expressed on a surface of the knitted base material using the retaining yarn when the knitted fabric is formed, at least two types of knitting yarns are used for the retaining yarns, at least one type of knitting yarn functions to make the other knitting yarns stand out, and a wire having a smaller diameter than the other knitting yarns is used for the at least one type of knitting yarn. Even if good. By configuring in this way, In a knitted fabric substrate having a pattern, the pattern is expressed by the retaining yarn, so that the orientation of the warp and weft yarns is not affected and the occurrence of uneven strength can be prevented. In addition, the other knitting yarns can be emphasized, and a variety of patterns can be expressed. Furthermore, by making at least one type of knitting yarn among the retaining yarns less noticeable compared to the other knitting yarns, the other knitting yarns can be emphasized, and a variety of patterns can be expressed.

[0010] Also, The at least one kind of knitting yarn may be of the same color as the reinforcing fiber yarn. good. By configuring in this way, By making at least one type of knitting yarn among the retaining yarns less noticeable compared to the other knitting yarns, the other knitting yarns can be emphasized, and thus a variety of patterns can be expressed.

[0011] Also, A method for knitting a knitted base material comprising a base material in which multiple layers of warp yarns and weft yarns made of reinforcing fiber yarns are provided so as to cross each other, and a retaining yarn for fixing the multiple layers of base material with a knitted fabric, wherein a pattern is expressed on the surface of the knitted base material using the retaining yarn when the knitted fabric is formed, at least two types of knitting yarns are used for the retaining yarns, and at least one type of the knitting yarns is a colored knitting yarn whose pigment transfers to the resin when the knitted base material is impregnated with resin. It can also be something like that. By configuring in this way, In a knitted fabric substrate having a pattern, the pattern is expressed by the retaining thread, so the orientation of the warp and weft threads is not affected and the occurrence of uneven strength can be prevented. Furthermore, when the knitted fabric substrate is impregnated with resin, the dye can be transferred to the area surrounding the knitting yarn, and the dye can be used to express the pattern in addition to the pattern expressed by the retaining thread. In this way, a variety of patterns can be expressed.

[0012] Also, A method for knitting a knitted base material comprising a base material in which multiple layers of warp and weft yarns made of reinforcing fiber yarns are provided so as to cross each other, and a retaining yarn for fixing the multiple layers of base material with a knitted fabric, wherein, when the knitted fabric is formed, a pattern is expressed on the surface of the knitted base material using the retaining yarn, and a colored yarn, the color of which will transfer to the resin when the knitted base material is impregnated with resin, is provided between the multiple reinforcing fiber yarns arranged in parallel, or so as to be aligned with the reinforcing fiber yarn. It can also be something like that. By configuring in this way, In a knitted base material having a pattern, the pattern is expressed by the retaining yarn, so the orientation of the warp and weft yarns is not affected, and it is possible to prevent the occurrence of uneven strength. Furthermore, when the knitted base material is impregnated with resin, the dye is transferred to the resin regardless of the retaining yarn (i.e., the pattern expression (shape) and arrangement of the retaining yarn), and in addition to the pattern expression using the retaining yarn, the pattern can be expressed using the dye. In this way, a variety of pattern expressions can be achieved.

[0013] Also, The pattern may be expressed using at least one of tuck, intarsia, and jacquard. good. By configuring in this way, Patterns can be created using tucks, intarsia or jacquard.

[0014] Also, The knitted fabric substrate according to the present invention is formed by the knitting method for the knitted fabric substrate. It is. By configuring in this way, By expressing a pattern using retaining yarns without partially changing the weaving method of the reinforcing fiber yarns, it is possible to have a pattern while preventing the occurrence of uneven strength. Effect of the Invention

[0017] The effect of the present invention is that in a knitted base material having a pattern, the pattern is expressed by the retaining yarn, so that the orientation of the warp and weft yarns is not affected and unevenness in strength can be prevented. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a front view showing an example of a knitted fabric base material according to the first embodiment. [Diagram 2] An enlarged view of part P1 in Figure 1. [Diagram 3] FIG. 4 is a front view showing a schematic view of a first region of the knitted fabric substrate. [Figure 4] FIG. 4 is a front view showing a schematic view of a second region of the knitted fabric base material. [Diagram 5] FIG. 2 is a plan view showing a schematic diagram of a knitted fabric substrate. [Figure 6] An enlarged view of part P2 in Figure 4. [Figure 7] FIG. 11 is a front view showing a schematic diagram of a knitted fabric base material according to a second embodiment, a third embodiment, and a fourth embodiment. [Figure 8] FIG. 13 is a front view showing a knitted fabric substrate (and an FRP using the same) according to a fifth embodiment. [Figure 9] FIG. 13 is a front view showing a knitted fabric substrate (and an FRP using the same) according to a sixth embodiment. [Figure 10] FIG. 13 is a front view showing a knitted fabric substrate (and an FRP using the same) according to a seventh embodiment. [Figure 11] 1A is a front view showing an example of a pattern expression using intarsia, and FIG. 1B is a front view showing another example of a pattern expression using intarsia. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In the following description, the directions indicated by arrows U, D, L, R, F, and B in the figure are defined as upward, downward, leftward, rightward, forward, and backward, respectively.

[0020] First, the configuration of a knitted fabric base material 1 according to a first embodiment of the present invention will be described.

[0021] 1 to 6 is a substrate formed by knitting fibers (knitting yarn 3 described later). The knitted substrate 1 of the present embodiment is intended to be used as a substrate for fiber reinforced plastic (FRP).

[0022] 1 and 2 show photographs of an example of the knitted fabric substrate 1, and FIG. 2 is an enlarged view of the P1 portion of FIG. 1. The other figures are schematic views of the knitted fabric substrate 1. Specifically, FIG. 3 and FIG. 4 are schematic views of the first region R1 and the second region R2 shown in FIG. 1 and FIG. 2. FIG. 5 is a schematic plan view of the knitted fabric substrate 1. FIG. 6 is an enlarged view of the P2 portion of FIG. 4.

[0023] The knitted fabric substrate 1 mainly comprises a substrate 2 and a knitting yarn 3 .

[0024] 1 to 5 is formed by appropriately arranging reinforcing fiber yarns. The substrate 2 mainly includes a first base yarn 10 and a second base yarn 20.

[0025] Reinforcing fibers (e.g., carbon fibers) are used as the first base yarn 10 and the second base yarn 20. Specifically, the first base yarn 10 and the second base yarn 20 are formed by twisting bundled carbon fibers in an appropriate twisting manner. Note that the first base yarn 10 and the second base yarn 20 do not necessarily have to be formed by twisting fibers, and for example, bundled reinforcing fibers can be used as the first base yarn 10 and the second base yarn 20 as they are.

[0026] The first base yarns 10 are warp yarns arranged to extend in the vertical direction. A plurality of the first base yarns 10 are arranged in parallel on the left and right. The first base yarns 10 are arranged at predetermined intervals from each other.

[0027] The second base yarn 20 is a weft yarn arranged to extend in the left-right direction. Specifically, the second base yarn 20 is arranged as a single yarn extending in the left-right direction, and is arranged so that it turns back to the opposite left-right direction at an appropriate position and extends to the next course (meandering). As a result, the second base yarn 20 is arranged in parallel such that multiple straight line portions extending left-right are lined up one above the other. The second base yarn 20 is arranged so that the straight line portions extending left-right intersect the first base yarn 10 at approximately right angles.

[0028] As shown in FIG. 5, the first base yarn 10 and the second base yarn 20 are provided in a plurality of layers along the front-rear direction. Specifically, a layer made of a plurality of first base yarns 10 arranged on the left and right and a layer made of a single second base yarn 20 arranged in a meandering manner are arranged so as to be alternately laminated front to back. At this time, the first base yarn 10 and the second base yarn 20 are arranged so as not to be interchanged in the front-rear positions (so as not to become a woven fabric). FIG. 5 shows an example in which the first base yarn 10 and the second base yarn 20 are laminated in six layers in the front-rear direction. Note that the multi-layered base material 2 may be formed by laminating at least one layer each of the first base yarn 10 and the second base yarn 20 (total of two layers), and the number of layers is not limited.

[0029] The knitting yarn 3 is a yarn (fixing yarn) that fixes the base material 2 formed of multiple layers by knitting. The knitting yarn 3 is used to express a pattern on the surface of the knitted base material 1 using multiple types of knitting structures. Any material such as polyester, nylon, polypropylene, etc. can be selected as the material of the knitting yarn 3. As shown in Figures 3 to 5, the knitting yarn 3 is knitted so that the crossover portion 3a extending between adjacent stitches in the course direction (left and right direction) passes behind the first base yarn 10 arranged at the rearmost position. The knitting yarn 3 is knitted so that the stitch portion 3b between each stitch that is continuous in the wale direction (up and down direction) passes in front of the second base yarn 20 arranged at the frontmost position. In this way, the knitting yarn 3 can fix the first base yarn 10 and the second base yarn 20 by holding the base material 2 formed of multiple layers by sandwiching it from the front and back with the crossover portion 3a and the stitch portion 3b.

[0030] In addition, the knitting yarn 3 according to this embodiment forms a knitted fabric using a plurality of types of knitting structures, thereby expressing a predetermined pattern on the surface of the knitted substrate 1. FIG. 1 illustrates a knitted substrate 1 on which a pattern of the letter "G" is expressed based on the difference in appearance of the knitting structure of the knitting yarn 3. In FIG. 1, in order to make the pattern easier to see, the outline of the letter "G" is traced with a white line to make the pattern stand out. In the following description, the region of the knitted substrate 1 other than the pattern (outside the letter "G") is referred to as a first region R1, and the region of the pattern portion is referred to as a second region R2.

[0031] As shown in Figures 2 and 3, in the first region R1, the knitted fabric is formed only by knit loops of the knitting yarn 3. On the other hand, in the second region R2, the knitted fabric is partially formed by using tuck loops, as shown in Figures 2 and 4. The stitch shape of the tuck portion in the second region R2 will be specifically described below.

[0032] As shown in Figure 6, when the knitting yarn 3 of X1 is tucked, the knit loop of X2 adjacent to the bottom of the tuck loop is pulled up to the same height as the knit loop of X1. When a new knit loop of X3 is formed between the tuck loop of X1 and the knit loop of X2, the tuck loop of X1 pulls the knitting yarn 3 of X3 backward (toward the back of the page), so the knit loop of X3 becomes smaller. As a result, the new knit loop of X4 formed in the knit loop of X3 is pulled downward and becomes larger.

[0033] In this way, by partially using tuck loops in the second region R2 shown in Fig. 4, the knitting structure of the second region R2 has a different appearance from that of the first region R1 shown in Fig. 3 (see Figs. 1 and 2). In this embodiment, the pattern of the letter "G" is expressed by using knitting structures that have different appearances in a specified pattern portion (second region R2) and the other portion (first region R1) as described above.

[0034] In this embodiment, by appropriately changing the knitting structure of the knitting yarn 3, an appropriate pattern can be expressed on the knitted substrate 1. In this case, there is no need to partially deform the reinforcing fiber yarn, such as by partially knitting the first base yarn 10 and the second base yarn 20, in order to express a pattern. Therefore, a pattern can be expressed without unevenness in strength.

[0035] Next, an example of a method for knitting the knitted fabric base material 1 as described above will be described.

[0036] The knitted fabric base material 1 can be knitted using a flat knitting machine. Specifically, a plurality of first base yarns 10 are supplied to the gap of the flat knitting machine in a state of being arranged on the left and right. The second base yarn 20 is inlaid in the gap of the flat knitting machine using a carrier that moves forward of the yarn feeding path of the first base yarn 10. When knitting the 6-layer knitted fabric base material 1 shown in FIG. 5, a plurality of first base yarns 10 are fed in three rows extending in the left and right direction to the gap of the flat knitting machine, and three second base yarns 20 are inlaid using three carriers that pass in front of the arrangement of each of the first base yarns 10. Then, the knitting yarn 3 is fed to the knitting needles of the front needle bed using a carrier that passes behind the arrangement of the first base yarn 10 arranged at the rearmost position, and a knitted fabric is knitted with the first base yarn 10 and the second base yarn 20 that are overlapped in multiple layers. By repeating the above knitting, the first base yarn 10 and the second base yarn 20 are fixed using the knitting yarn 3, and the knitted fabric base material 1 can be knitted. However, this knitting method for the knitted fabric base material 1 is only one example, and the knitting method is not limited to this and any knitting method can be used.

[0037] In addition, as shown in Fig. 3 and other figures, in this embodiment, the second base yarn 20 (weft yarn) is inserted once every two courses of knitting with the knitting yarn 3 to form the knitted fabric base material 1, but the present invention is not limited to this, and the interval at which the second base yarn 20 is inserted can be set arbitrarily. For example, it is also possible to insert the second base yarn 20 every time one course of knitting with the knitting yarn 3 is performed. In addition, as shown in Fig. 3, when the second base yarn 20 is inserted once every two courses of knitting with the knitting yarn 3, it is also possible to insert other yarns (for example, colored yarns, etc.) between adjacent second base yarns 20.

[0038] The knitted fabric base material 1 thus knitted can be impregnated with resin and heated and compressed to form an FRP. Note that, as a method of supplying resin, in addition to a method of applying resin to the knitted fabric base material 1, there is also a method of coating each yarn (first base yarn 10, second base yarn 20, or knitting yarn 3) with resin in advance.

[0039] Next, the configuration of the knitted fabric base material 1 according to the second embodiment of the present invention will be described with reference to FIG.

[0040] The knitted fabric substrate 1 according to the second embodiment differs from the knitted fabric substrate 1 according to the first embodiment (see FIG. 4, etc.) in that two types of knitting yarns (first knitting yarn 4 and second knitting yarn 5) are used, one of which is a transparent knitting yarn, instead of a single type of knitting yarn 3. This difference will be described below.

[0041] In the second embodiment, the first knitting yarn 4 and the second knitting yarn 5 are alternately used for each course. For example, the same yarn as the knitting yarn 3 according to the first embodiment is used as the first knitting yarn 4. In contrast, a transparent (or semi-transparent) yarn is used as the second knitting yarn 5. The transparency of the second knitting yarn 5 is not particularly limited, but a yarn having at least a higher transparency than the other retaining yarn (the first knitting yarn 4) is used. In FIG. 7, the second knitting yarn 5 formed of a transparent yarn is indicated by a two-dot chain line.

[0042] In this way, by using a highly transparent yarn for the second knitting yarn 5, when the FRP is formed by impregnating the yarn with resin, the presence of the other first knitting yarn 4 is emphasized (made conspicuous), and a variety of patterns can be expressed. For example, a visual effect can be obtained in which the first knitting yarn 4 appears to be floating in the resin.

[0043] The second knitting yarn 5 is not limited to a transparent (or semi-transparent) yarn, and it is also possible to use a yarn that becomes transparent (or semi-transparent) when impregnated with resin. Examples of such yarns include white polyester yarn and nylon yarn. These yarns become semi-transparent when impregnated with resin, and therefore, as in the example of FIG. 7, the presence of the first knitting yarn 4 can be emphasized.

[0044] Next, the configuration of a knitted fabric base material 1 according to a third embodiment of the present invention will be described with reference to FIG.

[0045] The knitted fabric substrate 1 according to the third embodiment differs from the knitted fabric substrate 1 according to the second embodiment in that the second knitting yarn 5 is not a transparent yarn but a yarn of a similar color to the first base yarn 10 and the second base yarn 20. This difference will be described below.

[0046] In the third embodiment, a thread of a similar color to the first base thread 10 and the second base thread 20 (reinforcing fiber thread) is used as the second knitting thread 5. For example, when carbon fiber is used as the reinforcing fiber, a black thread (or a similar color close to black) is used as the second knitting thread 5. When aramid fiber is used as the reinforcing fiber, a yellow thread (or a similar color close to yellow) is used as the second knitting thread 5.

[0047] The color of the second knitting yarn 5 is preferably the same as the color of the reinforcing fiber, but it does not necessarily have to be the same color, and it is possible to use a color similar to that of the reinforcing fiber. For example, the color of the second knitting yarn 5 may be a similar color to that of the reinforcing fiber (adjacent or close to the color wheel), the same color but with a different tone, or the same base color.

[0048] In this way, by using the second knitting yarn 5 as a knitting yarn of the same color as the reinforcing fiber, when the FRP is formed by impregnating it with resin, the presence of the other first knitting yarn 4 is emphasized (made conspicuous), and a variety of patterns can be expressed (see FIG. 7). For example, a visual effect can be obtained in which the first knitting yarn 4 appears to be floating in the resin. Note that, in order to emphasize the presence of the first knitting yarn 4, it is desirable that the color of the second knitting yarn 5 is at least closer to the color of the reinforcing fiber than the first knitting yarn 4.

[0049] Next, the configuration of the knitted fabric base material 1 according to the fourth embodiment of the present invention will be described.

[0050] The knitted fabric substrate 1 according to the fourth embodiment differs from the knitted fabric substrate 1 according to the second embodiment in that a thin metal thread (wire) is used as the second knitting thread 5 (see FIG. 7). This difference will be described below.

[0051] In the fourth embodiment, the second knitting yarn 5 is not a transparent yarn, but a metal yarn (wire) thinner than the first knitting yarn 4. The thickness and material of the second knitting yarn 5 are not particularly limited, but a yarn at least thinner than the first knitting yarn 4 is used.

[0052] In this way, by using a thin metal thread as the second knitting thread 5, the second knitting thread 5 becomes less noticeable. As a result, similar to the second embodiment, the presence of the other first knitting thread 4 is relatively emphasized (conspicuous), and a variety of patterns can be expressed.

[0053] The second knitting yarn 5 is not limited to a metal yarn, and may be any yarn that can emphasize the presence of the first knitting yarn 4. For example, if a yarn thinner than the first knitting yarn 4 is used, it is possible to emphasize the presence of the first knitting yarn 4. In this case, a yarn made of the same material as the first knitting yarn 4 may be used.

[0054] Next, the configuration of the knitted fabric base material 1 according to the fifth embodiment of the present invention will be described with reference to FIG.

[0055] The knitted fabric substrate 1 according to the fifth embodiment differs from the knitted fabric substrate 1 according to the first embodiment (see FIG. 4, etc.) in that two types of knitting yarns (first knitting yarn 4 and second knitting yarn 5) are used instead of a single type of knitting yarn 3, and one of the yarns contains a dye capable of coloring a resin. This difference will be described below.

[0056] Fig. 8 illustrates an FRP 100 formed by impregnating a knitted base material 1 according to the fifth embodiment with a resin. Of the first knitting yarn 4 and the second knitting yarn 5 according to the fifth embodiment, a colored yarn is used as the first knitting yarn 4. As the coloring matter for the first knitting yarn 4, a dye or pigment that transfers to the resin when the knitted base material 1 is impregnated with the resin is used. The second knitting yarn 5 does not contain a coloring matter that transfers to the resin.

[0057] By using such a first knitting yarn 4, when the knitted base material 1 is impregnated with resin, as shown in Fig. 8, the dye of the first knitting yarn 4 transfers to the resin, and the resin around the first knitting yarn 4 is colored. In Fig. 8, the colored parts are shown by hatching. In this way, the knitted base material 1 in the fifth embodiment can express patterns using dyes in addition to patterns expressed by the knitting structure of the first knitting yarn 4 and the second knitting yarn 5, and can express a variety of patterns.

[0058] It is possible to make not only the first knitting yarn 4 but also the second knitting yarn 5 contain a dye (the same dye or a different dye).

[0059] Next, the configuration of the knitted fabric base material 1 according to the sixth embodiment of the present invention will be described with reference to FIG.

[0060] The knitted fabric substrate 1 according to the sixth embodiment differs from the knitted fabric substrate 1 according to the first embodiment (see FIG. 4, etc.) in that a colored colored yarn 6 is disposed between the second base yarns 20 arranged in parallel above and below. This difference will be described below.

[0061] The colored yarn 6 is disposed between the second base yarns 20 so as to be generally parallel to the second base yarns 20. For example, the second base yarns 20 of the knitted substrate 1 according to the first embodiment may be partially thinned out, and the colored yarns 6 may be disposed in that portion. The colored yarns 6 are colored using a dye or pigment that transfers to the resin when the knitted substrate 1 is impregnated with the resin, similar to the first knitting yarn 4 according to the fifth embodiment (see FIG. 8).

[0062] By using such a colored yarn 6, when the knitted substrate 1 is impregnated with resin, as shown in FIG. 9, the color of the colored yarn 6 transfers to the resin, and the resin around the colored yarn 6 is colored. In this way, the knitted substrate 1 in the sixth embodiment can express a pattern using a colorant in addition to the pattern expression by the knitting structure of the first knitting yarn 4 and the second knitting yarn 5, and can express a variety of patterns. For example, in the example shown in FIG. 9, in addition to the pattern expression by the knitting structure, a pattern such as stripes can be expressed by the colorant. Also, unlike the fifth embodiment, the colorant can be transferred to the resin regardless of the arrangement of the knitting yarn 3, so that a variety of patterns can be expressed.

[0063] For convenience, Figure 9 shows an example in which one colored yarn 6 is arranged between two parallel second base yarns 20, but the number and arrangement of the colored yarns 6 are not limited to this. For example, it is also possible to arrange the second base yarns 20 and the colored yarns 6 alternately or in a random order.

[0064] Next, the configuration of a knitted fabric base material 1 according to a seventh embodiment of the present invention will be described with reference to FIG.

[0065] The knitted substrate 1 according to the seventh embodiment differs from the knitted substrate 1 according to the sixth embodiment (see FIG. 9) in that the colored yarns 6 are not disposed between the second base yarns 20, but are aligned with the second base yarns 20. By aligning the colored yarns 6 with the second base yarns 20 in this manner, the resin around the colored yarns 6 (second base yarns 20) can be colored, and a variety of patterns can be expressed.

[0066] Although an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate modifications are possible within the scope of the technical idea of ​​the invention described in the claims.

[0067] For example, in the above embodiment, an example was shown in which carbon fiber was used as the reinforcing fiber, but the present invention is not limited to this, and various other reinforcing fibers (e.g., glass fiber, aramid fiber, etc.) can also be used.

[0068] In addition, in the second embodiment, the third embodiment (see Figure 7) and the fourth embodiment (see Figure 8), examples have been shown in which two types of knitting yarns are used as retaining yarns, but the present invention is not limited to this, and it is also possible to use, for example, three or more types of knitting yarns.

[0069] In the sixth embodiment (see FIG. 9) and the seventh embodiment (see FIG. 10), the colored yarn 6 is arranged parallel to the second base yarn 20, but the present invention is not limited to this, and the colored yarn 6 can be arranged in any direction. For example, the colored yarn 6 can be arranged parallel to the first base yarn 10 (between the first base yarn 10 or aligned with the first base yarn 10).

[0070] In the above embodiment, the knitting structure of the second region R2 is made different from that of the first region R1 by using tucks in the second region R2, but the present invention is not limited to this. That is, it is possible to use other knitting methods (intarsia, jacquard, etc.) other than tucks. It is desirable that the knitting structure in the present invention includes at least one of tucks, intarsia, and jacquard.

[0071] A specific example of pattern expression using intarsia will be described below with reference to FIG.

[0072] FIG. 11 is a schematic diagram of a knitted fabric substrate 1 on which an intarsia pattern is formed using multiple knitting yarns (retaining yarns) of different colors. Symbol A (open circle) in the figure indicates, for example, a knit loop of a yellow knitting yarn that appears on the surface of the substrate. Symbol B (shaded circle) in the figure indicates, for example, a knit loop of a red knitting yarn that appears on the surface of the substrate. Symbol C (filled circle) in the figure indicates, for example, a knit loop of a black knitting yarn that appears on the surface of the substrate. Symbol T (inverted V-shaped mark) in the figure indicates a portion where two types of knitting yarns are tuck-connected.

[0073] Fig. 11(a) shows an example of a knitted fabric substrate 1 in which an intarsia pattern with colors separated to the left and right is formed using two types of knitting yarns, yellow and red. The two types of knitting yarns are tuck-connected to each other at the boundary. Note that the specific knitting method of the intarsia, the method of connecting the knitting yarns, etc. are not limited to the illustrated example, and any known method can be adopted.

[0074] In the example shown in Fig. 11(a), the size of the stitch is reduced by a tuck loop at the boundary between the two types of knitting yarn (part marked with symbol T), so the appearance of the stitch differs between this boundary and other parts. This makes it possible to highlight the boundary between the knitting yarns.

[0075] In the knitted fabric base material 1 in Fig. 11(a), by not tuck-connecting the two types of knitting yarns, the size of the stitches at the boundary becomes the same (uniform) as the size of the stitches in the other parts, so the boundary can be made to look neat. However, in this case, since the two types of knitting yarns are not connected to each other, if an FRP is formed using this knitted fabric base material 1, cracks may easily occur at the boundary.

[0076] On the other hand, Fig. 11(b) shows an example of a knitted base material 1 in which an intarsia pattern is formed using a black knitting yarn in addition to yellow and red knitting yarns. Specifically, in the knitted base material 1 of Fig. 11(b), a black knitting yarn is knitted between courses in which yellow and red knitting yarns are knitted. In the illustrated example, the second base yarn 20 is inserted once every two courses, and the black knitting yarn is disposed at the insertion position of the second base yarn 20.

[0077] In the example shown in FIG. 11(b), a pattern in which red and yellow stitches are arranged in a dot pattern can be obtained. In addition, in the example shown in FIG. 11(b), unlike the example shown in FIG. 11(a), the red and yellow knitting yarns are not tucked together at the boundary. However, in the example shown in FIG. 11(b), unlike the example shown in FIG. 11(a), the black knitting yarn is continuous across the entire knitting width. Therefore, even if an FRP is formed using this knitted fabric base material 1, cracks are less likely to occur at the boundary between the red and yellow knitting yarns. In addition, since the red and yellow knitting yarns are not tucked, the size of the stitches can be made uniform.

[0078] In the example shown in FIG. 11(b), the boundary portion can be made more prominent by tuck-connecting the red and yellow knitting yarns.

[0079] FIG. 11 illustrates an example in which intarsia is used as the knitting structure, but it is also possible to use jacquard. When jacquard is used, the knitting yarn is fed from two carriers, and the knitting yarn is knitted by knitting only one yarn and missing the other yarn. Here, in a section in which only one of the two knitting yarns (retaining yarn) is continuously knitted, the other knitting yarn is continuously missing. If the knitting yarn is not connected to the knitting substrate 1 over a long distance on the back surface of the knitting substrate 1, knitting defects may occur. Therefore, in consideration of ease of knitting, it is also possible to tuck and connect the yarn on the missing side to the other yarn at a predetermined interval. In addition, since the size of the stitches on the surface of the knitting substrate 1 changes by tucking in this way, it is also possible to express a pattern by using this tuck. In addition, a striped pattern or a lattice pattern can be formed by switching the knitting yarn to be knitted at a predetermined interval. In this case, the length of the missing part can be reduced without tucks. [Industrial Applicability]

[0080] The present invention can be applied to a knitting method for a knitted fabric substrate and a knitted fabric substrate. [Explanation of symbols]

[0081] 1. Knitted fabric base material 2 Base material 3. Knitting Yarn 4 First knitting yarn 5 Second knitting yarn 6 Colored thread 10 First base thread 20 Second base thread 100 FRP

Claims

1. A base material having multiple layers in which warp yarns and weft yarns made of reinforcing fiber yarns cross each other; A retaining yarn that fixes the multiple layers of base material with a knitted fabric; A method for knitting a knitted fabric substrate comprising: When forming the knitted fabric, a pattern is expressed on the surface of the knitted fabric base material using the retaining yarn, At least two types of knitting yarns are used for the retaining yarn, At least one type of knitting yarn among the knitting yarns functions to make other knitting yarns stand out, The at least one type of knitting yarn is a non-transparent yarn and has a property of becoming transparent or semi-transparent when the knitted substrate is impregnated with a resin. A method for knitting a knitted fabric substrate.

2. A substrate having multiple layers in which warp yarns and weft yarns made of reinforcing fiber yarns cross each other; A retaining yarn that fixes the multiple layers of base material with a knitted fabric; A method for knitting a knitted fabric substrate comprising: When forming the knitted fabric, a pattern is expressed on the surface of the knitted fabric base material using the retaining yarn, At least two types of knitting yarns are used for the retaining yarn, At least one type of knitting yarn among the knitting yarns functions to make other knitting yarns stand out, The at least one type of knitting yarn is made of a wire having a smaller diameter than the other knitting yarns. A method for knitting a knitted fabric substrate.

3. The at least one type of knitting yarn is of a similar color to the reinforcing fiber yarn. A method for knitting the knitted fabric base material according to claim 1 or 2.

4. A substrate having multiple layers in which warp yarns and weft yarns made of reinforcing fiber yarns cross each other; A retaining yarn that fixes the multiple layers of base material with a knitted fabric; A method for knitting a knitted fabric substrate comprising: When forming the knitted fabric, a pattern is expressed on the surface of the knitted fabric base material using the retaining yarn, At least two types of knitting yarns are used for the retaining yarn, At least one type of knitting yarn among the knitting yarns is a colored knitting yarn in which a pigment is transferred to a resin when the knitted base material is impregnated with a resin. A method for knitting a knitted fabric substrate.

5. A substrate having multiple layers in which warp yarns and weft yarns made of reinforcing fiber yarns cross each other; A retaining yarn that fixes the multiple layers of base material with a knitted fabric; A method for knitting a knitted fabric substrate comprising: When forming the knitted fabric, a pattern is expressed on the surface of the knitted fabric base material using the retaining yarn, A colored yarn is provided between the plurality of reinforcing fiber yarns arranged in parallel or aligned with the reinforcing fiber yarns, and the colored yarn is transferred to the resin when the knitted substrate is impregnated with the resin. A method for knitting a knitted fabric substrate.

6. The pattern expression uses at least one of tuck, intarsia, and jacquard. A method for knitting the knitted fabric base material according to any one of claims 1 to 5.

7. A knitted substrate formed by the knitting method for a knitted substrate described in any one of claims 1 to 6.

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