KR20140090937A - Method for forming knitted base material and knitted base material - Google Patents

Abstract

Provided by the present invention are a method for forming a knitted base material and the knitted base material thereof. The knitted base material is arranged over a whole base material by crossing threads which are formed with reinforced fiber as a knitted base material of a complex shape. A first knitted fabric (10a) is formed by knitting a base knitted fabric part by a knitted thread (60) while inserting an inlay thread (70) formed with reinforced fiber in a knitted width direction by corresponding to a basic paper pattern (100) which is a base having the shape of a knitted fabric (10a, 10b) which is knitted in a flat-knitting machine. In the common basic paper pattern (100), a second knitted fabric (10b) is formed by knitting the base knitted fabric part by the knitting thread (60) while inserting the inlay thread (70) formed with reinforced fiber in the knitted width direction by corresponding to the basic paper pattern (100) in a direction which is different from the knitting of the first knitted fabric (10a). The first knitted fabric (10a) and the second knitted fabric (10b) are folded in the same shape.

Description

METHOD FOR FORMING KNITTED BASE MATERIAL AND KNITTED BASE MATERIAL BACKGROUND OF THE INVENTION [0001]

TECHNICAL FIELD The present invention relates to a knitted base material forming method and a knitted base material wherein yarns made of reinforcing fibers are crossed over the entire base material. And more particularly to a method for forming a knitted base material having a complicated shape.

BACKGROUND ART [0002] Knitted base materials using reinforcing fibers are used as materials of fiber-reinforced plastic (FRP: fiber-reinforced plastics) or bullet-proof / As a method of knitting a knitted fabric in which yarns made of reinforcing fibers cross each other, there is a technique described in Patent Document 1. Patent Literature 1 discloses a multilayer knitted structure (a multilayer knitted structure) in which layers of warp yarns made of reinforcing fibers and weft yarns are combined by a knitting yarn using a weft knitting machine, ) Are disclosed. The knitted base material is obtained by arranging a plurality of warp yarns in parallel and feeding the knitted yarn from the top to a needle bed gap of the weft knitting machine by means of a carrier of the weft knitting machine, It is organized by combining a warp and a weft to form a cloth.

Japanese Patent Publication No. 2000-501792

As a knitted base material, various shapes as well as a rectangular shape are desired. To knit a knitted fabric of a desired shape, knitting with a weft yarn involves changing the return position of the carrier. In the knitted base of Patent Document 1, a plurality of warp yarns arranged in parallel are fixed and knitted. Therefore, even if the positions of the weft yarns and the knitting yarns are changed, the warp yarns are limited to the arrangement in the direction along the needle bed gap, and only the warp yarns are arranged in parallel to form the knitted fabric base. In order to make the knitted base material into a desired shape, a post-treatment for cutting and removing the warp yarn is required.

One of the objects of the present invention is to provide a method of forming a knitted base material in which yarns made of reinforcing fibers are crossed over the entire surface of the base material. Another object of the present invention is to provide a method of forming a knitted base material in which yarns made of reinforcing fibers are arranged in an intersecting state in an arbitrary shape. It is still another object of the present invention to provide a knitted base material formed by applying the method for forming a knitted base material of the present invention.

The method for forming a knitted base material of the present invention is a method for forming a knitted base material by using a flat knitting machine, and comprises the following steps? To?.

[Process alpha] ... The first knitted fabric is formed by knitting the base knitted fabric part by the knitting yarn while inserting the inlay yarn made of the reinforcing fiber in the knitting width direction in correspondence with the basic fabric serving as the basis of the shape of the knitted fabric to be knitted in the weft knitting machine.

[Process beta] ... In the basic form, the second knitted fabric is formed by knitting the base knitted shoulder with the knitting yarn while inserting the inlay yarn made of the reinforcing fiber in the knitting widthwise direction in correspondence with the basic form in a direction different from that in the knitting step? .

[Process γ] ... The first knitted fabric and the second knitted fabric are stacked so that their shapes coincide with each other.

As one form of the method for forming a knitted base material in the present invention, at least a part of the base knitting needles is formed so that the number of stitches in the knitting width direction is different from each other in the wale direction (longitudinal direction of the knitting fabric) . ≪ / RTI > As a specific knitting method of changing the number of stitches in the knitting width direction, at least one of a width-increasing stitch, a width-reduced stitch, and a back knitting can be used.

The knitted base material of the present invention is a knitted base material composed of a plurality of knitted fabrics. Each of the knitted fabrics includes knitting yarn for knitting a base knitting around portion and an inlay yarn inserted in the knitting width direction in the base knitting around portion and made of reinforcing fibers. The at least two knitted fabrics constituting the knitted base material are stacked so that the orientation directions of the inlay yarns are different from each other.

As one form of the knitted base material of the present invention, the inlay yarn includes a straight portion and a return portion which is returned from the straight portion at the end portion in the knitting width direction of the knitted fabric and connected to the next straight portion .

As one form of the knitted base material of the present invention, the knitted fabric includes a region in which at least a part of the knitted fabric has regions of different stitch number in the knitting widthwise direction in the wale direction.

The fiber-reinforced plastic of the present invention comprises a base material made of a resin and a fiber base material for reinforcing the base material, wherein the fiber base material is the knitted base material of the present invention.

The method of forming a knitted base material of the present invention can easily knit a plurality of knitted fabrics having the same shape but different orientation directions of the inlay yarn by using one common basic paper. It is possible to easily obtain a knitted base with different orientation directions of the inlay yarns by simply folding the knitted fabric so that the knitted fabrics coincide with each other. The inlaid yarn can be crossed over the entire knitted fabric by inserting the inlay yarn in the knitting width direction in correspondence with the basic fabric even if the knitted fabric base is of a complicated shape. The degree of freedom of the orientation direction of the inlay yarn is high because it is necessary to set the knitting angle of the basic type paper when knitting each knitted fabric so that the inlaying direction of the knitted base material becomes the desired orientation direction. Further, since knitted fabrics are formed and knitted using a common basic type paper, a complicated shaped knitted fabric base can be easily obtained. Since each knitted fabric has the reinforcing fibers inserted only in the knitting widthwise direction as an inlay yarn, the knitted fabric is stretched in the wale direction of the knitted fabric. Therefore, since each knitted fabric has flexibility, it is easy to superpose each knitted fabric.

The knitted fabric can be easily formed into an arbitrary shape by knitting at least a part of the base knitted fabric so that the number of stitches in the knitting width direction is different from each other in the wale direction. Particularly, in the wale direction, the knitted fabric portion can be knitted in a three-dimensional manner by performing a width-increasing stitch, a width-reducing stitch, a back-knitting or the like. In the method of forming a knitted base material of the present invention, since each knitted fabric is knitted using a common basic paper, even if the knitted fabric base is a three-dimensional knitted fabric, the knitted fabric corresponding to the basic paper is placed to cross the inlaid yarn .

The knitted base material of the present invention has high strength because it is arranged so that the orientation directions of the inlay yarns made of the reinforcing fibers are different from each other. In the knitted base material of the present invention, each knitted fabric includes an inlay yarn, so that the reinforcing fibers can be arranged in the knitting width direction of each knitted fabric. The knitted fabrics in which the inlay yarns are arranged in the knitting width direction are overlapped with each other so that the inlay yarns cross over the knitted fabric base material and are constantly high in strength throughout the knitted fabric base. In addition, even if the knitted base material has a complicated shape, the inlay yarn can be crossed over the entire knitted base material.

The inlay yarn becomes a higher strength knitted substrate due to the presence of a region constituted by a series of straight portions and return portions.

The knitted fabric has an arbitrary shape because at least a part of the knitted fabric has a region where the number of stitches in the knitting width direction is different in the wale direction. Particularly, in the wale direction, the knitted fabric portion has a three-dimensional shape by performing width-wise stitching, width-reduced stitching, return knitting or the like. The knitted base material of the present invention has high strength because an inlay yarn crosses over the entire knitted base material even if it is a complicated three-dimensional shape. Especially, the inlay yarn is not cut on the way over a large area, so that a series of three-dimensional knitted base materials can be obtained.

Since the fiber-reinforced plastic of the present invention uses the knitted base material of the present invention having a substantially constant planar shape or a three-dimensional shape other than a square, as well as a simple planar shape such as a square, It is high strength throughout the entire fiber reinforced plastic.

Fig. 1 (A) is a schematic view of the knitted base shown in the first embodiment, and Fig. 2 (B) is a view showing a pattern corresponding to the knitted base of Fig. 1 (A).
2, (A) is a schematic view of the knitted base shown in the second embodiment, and (B) is a diagram showing a pattern corresponding to the knitted base of (A).
3, (A) is a schematic view of the knitted base shown in the third embodiment, and (B) is a diagram showing a pattern corresponding to the knitted base of (A).
4, (A) is a schematic view of the knitted base shown in the fourth embodiment, and (B) is a diagram showing a pattern corresponding to the knitted base of (A).

≪ Embodiment 1 >

Hereinafter, the knitted base material (the knitted base material) and the forming method thereof of the present invention will be described. The knitted substrate is formed by using a knitting machine as described later, but the structure of the knitted substrate will be described first, and then the method of forming the knitted substrate will be described. The knitted base material 1 of the present embodiment shown in Fig. 1 is composed of two knitted fabrics 10a and 10b. Each of the knitted fabrics 10a and 10b includes a knitting yarn 60 constituting a base knitted fabric portion and an inlay yarn 70 formed of reinforcing fibers . One of the features of the present invention resides in that the knitted fabrics 10a and 10b are stacked so that the inlay yarns 70 have different orientation directions (orientation directions).

[Knitted goods]

1 (A), the knitted fabric 1 has an isosceles trapezoidal plane shape and has a weft yarn 71 and a warp yarn 72 made of reinforced fibers. The weft yarns 71 and the warp yarns 72 are orthogonal. The knitted base material 1 is superimposed so that two knitted fabrics 10a and 10b, which are formed as shown in Fig. 1 (B), coincide with each other.

[Knitting fabric]

The inlaid yarn 70 is inserted into the knitted fabric 10a and 10b by the knitting yarn 60. The knitted fabrics 10a and 10b have the same shape and the orientation direction of the inlay yarns 70 is different from each other by 90 degrees. The inlay yarn 70 of the knitted fabric 10a is used as a weft yarn 71 of the knitted base material 1 and the inlay yarn 70 of the knitted fabric 10b is used as the warp yarns 72 of the knitted base material 1. [ .

The knitting yarn 60 may be a reinforcing fiber or a non-reinforced resin fiber. Examples of the reinforcing fiber include carbon fiber, aramid fiber, glass fiber, ultrahigh molecular weight polyethylene (concrete example: Dyneema: registered trademark) and the like. Examples of unreinforced resin fibers include nylon resin fibers, polyethylene resin fibers, polyester resin fibers, polypropylene resin fibers, polyether ether ketone fibers, (Thermoplastic resin fiber), unsaturated polyester fiber (unsaturated polyester resin fiber), phenol resin fiber (phenol resin fiber) such as polyetheretherketone resin fiber, polyetheretherketone resin fiber and polyetherketone resin fiber, , Thermosetting resin fibers (thermosetting resin fibers) such as epoxy resin fibers (epoxy resin fibers). A high-strength yarn containing a metal may be used. Examples of the metal material include a thread made of stainless steel, a thread made of aluminum alloy, and a thread made of titanium alloy. When the knitted substrate 1 of the present invention is used for the base material of the FRP, the thermoplastic resin fiber is melted by the heat received during the manufacturing process of the FRP to keep the original shape of the knitting yarn 60, Can be integrated with a resin that is a base material. When the knitted substrate 1 of the present invention is used as a material for a bullet-proof vest, the strength of the base knitted fabric can be increased by using a high-strength yarn containing reinforcing fiber or metal, which is preferable.

The inlay yarn 70 is made of a reinforcing fiber, and examples thereof include carbon fiber, aramid fiber, glass fiber, ultrahigh molecular weight polyethylene (concrete example: Dyneema: registered trademark) and the like.

The inlay yarn 70 is formed in such a manner that in the stitch formed by the knitting yarn 60 as shown in an enlarged view excerpted from only the knitted fabric 10a in Fig. (The front side and the depth side of the paper surface) alternately. The method of inserting the inlay yarn 70 is not limited to the method of this enlarged view, and other known methods can be employed.

As shown in the enlarged view of Fig. 1 (A), when the inline yarn 70 forms a straight line portion 70s in a single yarn, the inlay yarn 70 returns (Return portion) 70r, and is arranged in a meandering arrangement (serpentine arrangement) so as to form the next straight portion 70s. The inlay yarn 70 may be formed as a single yarn and a single yarn, and each straight yarn may be formed as a separate yarn. For example, when the edge portion of the knitted substrate 1 is cut into a desired shape, each straight portion becomes a thread.

Although the angle formed by the inlay yarns 71 and 72 is 90 degrees (orthogonal) here, the inclination of the basic type paper (basic type paper) 100 is changed to an arbitrary angle, The angle formed by the inlay yarns 71 and 72 can be set to a desired angle such as 45 degrees.

At least two knitted fabrics may be used, and at least two knitted fabrics may be used as long as the inlay yarns 70 have different orientation directions. Since the knitted fabric 1 is formed by covering the knitted fabrics 10a and 10b, the base knitted shoulder is double and has a thickness. As the number of knitted fabrics increases, the thickness of the knitted fabric increases.

The knitted base material 1 of the present embodiment has a two-dimensional shape, but the side to which the knitted base material 1 is attached is, for example, an upper side 11 side and a lower side 12 side, (Skirt shape) that is tapered from the lower side 12 toward the upper side 11, the knitted substrate 1 may be attached so as to surround the knitted substrate 1. In this case,

The shape for knitting the knitted base material 1 of the present embodiment is a planar shape of an isosceles trapezoid, but may be, for example, a pattern made up of a plurality of substantially triangular shaped parts, It is also possible to perform the return knitting. Even in this case, the orientation direction of the inlay yarn 70 is different.

The knitted base 1 shown in Fig. 1 (A) and the basic paper 100 shown in Fig. 1 (B) are schematic views showing the orientation of the inlaid yarn 70 when the knitted fabric 10a, And the direction is shown in the figure for easy understanding. Actually, when the knitted fabric 1 is seen on the upper side when the knitted fabric 10b is overlaid on the knitted fabric 10a, the inlaid yarn (warp 72) of the knitted fabric 10b is seen.

[Usage]

The knitted base material (1) of the present invention can be suitably used for the base material of FRP. In this case, the knitted substrate 1 of the present invention is impregnated with a resin and heat-compressed. If the knitting yarn 60 of the knitted substrate 1 contains a resin, the knitted substrate 1 may be further impregnated or coated with resin, but this addition is not essential. In addition to this, the knitted base material 1 of the present invention can be suitably used for a bulletproof vest material.

[Method of forming knitted substrate]

The knitted base material 1 of the present invention can be obtained by the following method using a weft knitting machine. In the method of forming the knitted substrate 1 of the present invention, a plurality of knitted fabrics 10a and 10b are knitted (knitted) using a common basic paper sheet 100 serving as a basis of the shape of a knitted fabric to be knitted by the flat knitting machine do. The knitting fabric includes a pair of needle beds extending in the left-right direction and facing each other in the back-and-forth direction, and the stitches can be transferred between the front and back needle beds In addition, two bed knitting machines (even four knitting machines) capable of racking at least one needle bed are used. Basically, when one of the two needle beds is mainly used, the knitted fabric 10a, 10b can be knitted.

[Basic form]

The basic paper 100 used in the present embodiment is a planar shape of an isosceles trapezoid formed by the upper side 111, the lower side 112, and the side side 113 as shown in Figs. 1 (B) - (a). Since the knitted base material 1 of the first embodiment is a two-dimensional shape, the shape of the base paper sheet 100 is the same as that of the knitted base material 1 as it is. The upper side 111, the lower side 112 and the side sides 113 of the basic paper 100 correspond to the upper side 11, the lower side 12 and the side side 13 of the knitted substrate 1. The direction of the basic paper 100 shown in Figs. 1 (B) - (a) is referred to as 0 degree.

[Process?]

The knitted fabric 10 is knitted by knitting the base knitted shoulder portion with the knitting yarn 60 while inserting the inlay yarn 70 in correspondence with the basic type paper 100 having the shape shown in Figs. 1 (B) - (a) . In the figure, a plurality of horizontal lines are the inserting direction of the inlay yarn 70.

In the knitting method of knitting fabric 10a, first knitting is performed by knitting yarn 60 in one of the needle beds. The knitted stitches are transferred one by one to the other opposite needle bed and the inlay yarn 70 is inserted between both needle beds. Then, the transferred stitch is returned to its original state. Thus, as shown in the enlarged view of Fig. 1 (A), the inlaid yarns 70 can be arranged alternately before and after the adjacent stitches. The inserted inlay yarn 70 can be fixed by newly knitting the stitch of this one course. Since the base paper sheet 100 has an isosceles trapezoidal shape and the sides 113 are inclined, when making a new knitting, knitting is performed by narrowing stitch. In this state, the newly knitted stitches are transferred one by one to the other opposite needle bed, and the inlaid yarn 70 is inserted between both needle beds to return the transferred stitches to their original state. By repeating this operation, the inlay yarn 70 can be arranged in correspondence with a plurality of horizontal lines of the basic form 100 shown in Figs. 1 (B) - (a). In this knitted fabric 10a, the lower side 112 starts knitting and the upper side 111 ends knitting.

[Process?]

The basic paper 100 is rotated 90 degrees as shown in Figs. 1 (B) - (b). The knitted fabric 60 is knitted by the knitting yarn 60 while inserting the inlay yarn 70 in a manner similar to the knitting method of the knitted fabric 10a so as to correspond to the basic type paper 100 rotated 90 degrees, ). In the figure, a plurality of horizontal lines are the inserting direction of the inlay yarn 70. Here, the basic paper 100 is rotated 90 degrees, but the rotation angle of the basic paper 100 can be arbitrarily set. In this knitted fabric 10B, the right edge of the lower side 113 starts knitting, and the right edge of the upper side 113 is knitted.

[Process?]

The knitted fabric 10a and the knitted fabric 10b are overlapped with each other in shape. Since the basic paper stock 100 used for knitting the knitted fabric 100 and the knitted fabric 10b used for knitting the knitted fabric 10a are different from each other by 90 degrees as shown in Figs. 1 (B) - (c) When the both side basic papers 100 are overlapped, the inserting direction of the inlay 70 is orthogonal. The knitted fabric base material 1 is knitted in such a manner that the inlay yarn 70 is warped by the warp yarns 71 and the warp yarns 72, State is arranged over the entire knitted substrate 1 (Fig. 1 (A)).

≪ Embodiment 2 >

In the first embodiment, a knitting method of the knitted base material 1 in a two-dimensional shape has been described. In Embodiment 2, a knitting method of a three-dimensional knitted substrate 2 will be described with reference to Fig. The knitted substrate 2 of the second embodiment has a convex portion 22 curved at a central portion of a rectangular-shaped edge portion 21 as shown in Fig. 2 (A). The knitting yarn or inlay yarn used for each of the knitting fabrics 20a and 20b is the same as that of the first embodiment. Therefore, a knitting method of the knitted base material 2 using the basic type paper 200 will be described below.

[Basic form]

As shown in Fig. 2 (B) - (a), the basic paper 200 has a half-body of a shape in which a large trapezoid and a small trapezoid are integrated, A convex portion 222 arranged to be symmetrical with respect to the projection 222 and a quadrangular-shaped edge portion 221 interposed therebetween. This basic type paper 200 is a pattern in which a three-dimensional shaped knitted base material 2 is developed two-dimensionally. Therefore, when knitting each of the knitted fabrics 20a, 20b in correspondence with the basic paper pattern 200, the area indicated by an arrow in Fig. 2B is knitted while being connected. This connection forms a knitted fabric portion for forming a three-dimensional body in the course direction or the wale direction, and connects each knitted fabric portion. The edge portion 221 and the convex portion 222 of the basic paper support 200 correspond to the edge portion 21 and the convex portion 22 of the knitted substrate 2. [ The direction of the basic paper stock 200 shown in Figs. 2 (B) - (a) is referred to as 0 degree.

The knitted fabric 20a is knitted by knitting the base knitted fabric part by the knitting yarn 60 while inserting the inlay yarn 70 in correspondence with the basic type paper 200 shown in Fig. 2 (B) - (a) Step a). The knitting fabric 20a is knitted by reciprocally knitting one edge portion 221 (the lower side of the sheet) of the knitted fabric 20a in correspondence with the base paper sheet 200, and the number of stitches in the knitting width direction is changed by the convex portion 222 And then the other edge portion 221 (upper side of the sheet) is reciprocally knitted. At this time, when the final course of one edge portion 221 (lower side of the sheet) is knitted in correspondence with the shape of the convex portion 222, the stitch of a part of the knitting fabric is engaged with the knitting needle and the knitting is stopped The knitting position is changed by knitting so as to narrow the knitting width to the center of the convex portion 222. Stitches joined to knitting needles that have been put in a still state after that are also included, so that knitting is performed so that the knitting width is widened. In the knitting fabric 20a, the lower side of the lower edge portion 221 of the ground starts knitting, and the upper edge of the upper side of the ground surface is knitted.

Next, as shown in Figs. 2B and 2B, the basic paper 200 is rotated by 90 degrees. The knitted fabric 20 is knitted by knitting the base knitted fabric part with the knitting yarn 60 while inserting the inlay yarn 70 in accordance with the basic paper 200 rotated 90 degrees (step?). The knitting fabric 20b is knitted continuously from one side edge (lower side of the sheet) of the both edge portions 221 in correspondence with the basic sheet material 200, The convex portion 222, which is a knitted fabric portion for forming a solid body between the both side edge portions 221, is knitted. The convex portion 222 is knitted by a double loop (width reduction) in correspondence with the shape of the convex portion 222 after knitting to the center of the convex portion 222, ) Of the knitting yarns are narrowed to narrow the mutual distance and connect each knitted fabric portion. In this knitted fabric 20b, side edges positioned on the lower side of the paper edge of both edge portions 221 start knitting, and side edges on the upper side of the paper where both edge portions 221 oppose are knitted.

Then, the knitted fabric 20a and the knitted fabric 20b are superimposed on one another so as to conform to each other (process?). At this time, the convex portions 22 of the knitting fabrics 20a and 20b also coincide with each other. The knitted base material 2 thus formed is arranged so that the inlaid yarn 70 is orthogonal to the warp yarn 71 and the warp yarn 72 over the entirety of the knitted base material 2 (Fig. 2 (A)). The convex portion 22 is also in a state in which the inlay yarns 70 are orthogonal to each other.

≪ Embodiment 3 >

In Embodiment 3, a method of forming a knitted base material 3 of another three-dimensional shape will be described with reference to Fig. 3 (A), the knitted substrate 3 of Embodiment 3 has a substantially circular throat portion 32 at a part (edge portion 31) of a rectangular base material, And a tubular portion 33 which is continuous from the inner edge of the edge portion 31 and whose axial direction is orthogonal to the edge portion 31. The tubular portion 33 becomes smaller in diameter away from the throttle portion 32, and the upper and lower ends thereof are opened. Since the knitting yarn and the inlay yarn used in each of the knitting fabrics 30a and 30b are the same as those in the first embodiment, a method of forming the knitted base material 3 using the basic type paper 300 will be described below.

[Basic form]

As shown in Figs. 3 (B) - (a), the basic paper 300 has two tubular portions 333 arranged in parallel so that three long trapezoids are arranged on a straight line, A tubular portion 333 is formed at a rim opposite to the tubular portion 333 at the edge portion 331. The tubular portion 333 has a substantially rectangular shape, And a throttling portion 332 formed to correspond to the long side of the tapered portion. The basic paper 300 is a pattern in which a three-dimensional knitted substrate 3 is developed two-dimensionally. Therefore, when knitting each of the knitted fabrics 30a, 30b in correspondence with the basic paper 300, the area indicated by the arrow in Fig. 3B is knitted while being connected. In this connection, a knitted fabric portion for forming a three-dimensional body is formed in the course direction or the wale direction as in the second embodiment, and the knitted fabric portions are connected. The edge portion 331 of the basic paper 300, the tightening portion 332 and the tubular portion 333 are formed on the edge portion 31, the tightening portion 32 and the tubular portion 33 of the knitted substrate 3 Respectively. The direction of the basic paper 300 shown in Figs. 3 (B) - (a) is referred to as 0 degree.

The knitting fabric 30a is knitted by knitting the base knitting needles with the knitting yarn 60 while inserting the inlay yarns 70 in correspondence with the basic type paper 300 shown in Figs. 3 (B) - (a). In this knitting sequence, a square portion formed by an extension line of a boundary with the central portion of the throttling portion 332 is reciprocated at one of the edge portions 331 (lower side of the sheet) 331 are knitted with right and left right-angled trapezoidal portions with the hypotenuse of the throttle portion 332 as sides, and the other right-angled trapezoidal portions are respectively recoil knitted. The stitch row at the wale-direction end of the edge portion 331 is stopped and the tubular portion 333 (the lower side of the sheet) continuous with the tightening portion 332 is moved to the short side of the small trapezoid By the known width reduction stitch. When the respective small trapezoids forming the tubular portion 333 are knitted, knitting is performed while connecting the small trapezoids, and both ends of the tubular portion 333 in the knitting width direction (the left hypotenuse of the small trapezoid on the left- The right hand side hypotenuse of the small trapezoid of FIG. And another tubular portion 333 (on the upper side of the sheet) arranged so as to face the next is knitted from the short side of the small trapezoid toward the long side. Since the upper end of the tubular portion 33 of the knitted fabric 3 (Fig. 3A) is opened, no connection is made between the small trapezoidal short sides of the tubular portion 333 arranged so as to face each other. Thus, the longitudinal stitch row of the tubular portion 333 on the lower side of the drawing sheet is subjected to the peeling, and the tubular portion 333 on the upper side of the sheet is started to be knitted. The tubular portion 333 on the upper side of the drawing sheet is formed by continuously knitting the short sides of each small trapezoid, and while knitting a known widening stitch while connecting the small trapezoids to each other, The knitting yarn is knitted by changing the return position by including stitches joined to the knitting needles in the stopped state in the knitting yarns 333. It is possible to start knitting one right-hand or left-hand rectangular trapezoidal portion with the hypotenuse of the throttling portion 332 on the upper side of the ground surface as the sides of the stationary knitted fabric of the lower side edge portion 331, And is connected to the final stitch of tubular portion 333. In addition, the other right-angled trapezoidal portion is also connected to the final stitch of the tubular portion 333 on the upper side of the sheet, including the stitches joined to the stitches made in the stopped state at the lower side edge portion 331. Finally, the remaining square portion of the edge portion 331 is reciprocally knitted. The inlay yarn 70 may be changed to another inlay yarn at the boundary portion of the pair of barrel portions 333. [ The knitted fabric 30a starts knitting at the lower edge of the lower edge 331 and finishes knitting at the upper edge of the edge 331 at the upper edge of the ground.

The knitted fabric 30b is continuously knitted from one end side (lower side of the sheet) of both side edge portions 331 in correspondence with the basic paper type 300 shown in Figs. 3 (B) - (b) The tubular portion 333 is knitted between the both side edge portions 331 while being widened inward at the knitting position of the side edge portions 333. Since the upper end of the tubular portion 33 of the knitted fabric 3 (Fig. 3A) is opened, no connection is made between the small trapezoidal short sides of the tubular portion 333 arranged so as to face each other. After the tubular portion 333 is knitted up to the center thereof, the knitted fabric portion is connected while narrowing the distance between the both edge portions 331 by reducing the width. The knitted fabric 30b is knitted at the side of the both side edge portions 331 located on the lower side of the ground and the upper side of the both side edge portions 331 is knitted.

Here, although the upper end of the tubular portion 33 is opened in the knitted substrate 3 (Fig. 3A), it is also possible to adopt a configuration in which the lid is opened. In that case, the base paper 300 is connected by a lid which is not shown in the drawing, the short trapezoidal short sides of the two tubular portions 333.

In the third embodiment, since the knitted fabric 3 is superimposed on the knitted fabric 30a and 30b so as to conform to each other, the tubular portion 33 is also superposed. The knitted substrate 3 is arranged so that the inlaid yarn 70 is orthogonal to the warp yarn 71 and the warp yarn 72 over the entire knitted fabric 3 (Fig. 3 (A)). The tubular portion 33 is also in a state in which the inlay yarns 70 are perpendicular to each other.

≪ Fourth Embodiment >

4, a knitted substrate 4 having the same shape (the edge portion 41, the tightening portion 42, and the tubular portion 43) as in Embodiment 3 is used in Embodiment 4, A method of forming the base paper 400 using a different base paper 400 will be described. The knitting yarn and the inlay yarn used in the knitted fabrics 40a and 40b are the same as those in the first embodiment. Therefore, the method of forming the knitted base 4 using the basic type paper 400 will be described below.

[Basic form]

As shown in Figs. 4 (B) - (a), the basic paper 400 includes a throttling portion 442 in which three small trapezoids are arranged in parallel so that the long side and the short side are respectively on a straight line, 442 disposed continuously on the side of the short side of the throttle portion 442 and a tubular portion 443 continuously arranged on the side of the short side of the throttle portion 442. [ This basic type paper 400 is a pattern in which a three-dimensional shaped knitted fabric base 4 is developed two-dimensionally. 4B, since the basic paper stock 400 is shown in two dimensions, only the front half of the actual basic paper stock 400 is shown in the figure. That is, the back half of the same shape as the front half is on the depth direction side of the paper. When knitting each of the knitted fabrics 40a and 40b in correspondence with the basic paper 400, the area indicated by an arrow in Fig. 4B is connected and knitted. In this connection, similarly to Embodiment 2, a knitted fabric portion for forming a three-dimensional body is formed in the course direction or the wale direction to connect each knitted fabric portion. The edge portion 441 of the basic paper stock 400, the tightening portion 442 and the tubular portion 443 are attached to the edge portion 41, the tightening portion 42 and the tubular portion 43 of the knitted substrate 4 Respectively. The direction of the basic paper stock 400 shown in Figs. 4 (B) - (a) is referred to as 0 degree.

The knitting fabric 40a is knitted by knitting the base knitting needles with the knitting yarn 60 while inserting the inlay yarns 70 in correspondence with the basic type paper 400 shown in Figs. 4 (B) - (a). In this knitting sequence, first, the front and rear half edge portions 441 are individually reciprocally knitted at the front needle bed and the back needle bed, respectively. At this time, the inlay yarns 70 are individually inserted into the front and back needle beds. The stitch rows located on both sides of the tightening portion 442 among the stitch rows at the wale-direction ending of each of the edge portions 441 are bonded to the stitch rows of the opposing needle beds. Next, the front and rear half throttling portions 442 are knitted into an integral tubular shape from the front needle bed and the back needle bed while making the width reduction stitches. The tubular portions 443 of the front half and the back half are knitted in a tubular shape integrally from the front needle bed and the back needle bed in succession to the tubular knitting. When the tubular knitting is performed, the inlay yarns 70 may be inserted by two of the inlay yarns 70 used for knitting the respective edge portions 441, or only one of the inlay yarns 70 may be inserted. In the knitted fabric 40a, the lower ends of the front and rear halves 441 start knitting, and the opening edges of the tubular portion 443 finish knitting.

The knitted fabric 40b has edge portions 441, a thimble portion 442, and a tubular portion 443 in front half and back half in correspondence with the basic paper 400 shown in Figs. 4 (B) - (b) Are knitted in the front needle bed and the rear needle bed, respectively. The portions (upper and lower portions of the throttling portion 442) that are not connected to the throttle portion 442 on the side of the throttle portion 442 side of the respective edge portions 441 (the left side of the paper) Kneaded continuously in the bed and the back needle bed. The portions of the respective edge portions 441 connected to the throttling portions 442 individually knit the edge portions 441 and the throat portions 442 in the front needle bed and the back needle bed. At the end of the tubular portion 443 side (left side of the paper) of the tightening portion 442, the tightening portion 442 and tubular portion 443 are connected and knitted. The throttling portion 442 is formed by connecting knit stitches of a part of the knitting fabric in correspondence with three small trapezoids to knit by changing the return position while the knitting is stopped, And knitting is performed by changing the return position to connect mutually adjacent small trapezoids on the top and bottom of the paper. The tubular portion 443 is knitted individually at the front needle bed and the back needle bed while the lower side of the ground is knitted at the start of knitting and the tubular portion 443 is knitted from the end of the tightening portion 442 (right side of the paper) . At the beginning of the knitting of the tubular portion 443 and the knitting of the upper side of the sheet, the knitted fabric to be knitted at the front needle bed and the back needle bed is joined. One end of the tightening section 442 in the course direction (the right side of the paper) is connected to the edge section 441 by continuous knitting. The other end (the left side of the paper) And is connected by knitting. The knitted fabric 40b is knitted at the side located on the lower side of the front half and the rear half of the edge 441 and the upper side of the side of the edge 441 is knitted.

Here, although the upper end of the tubular portion 43 of the knitted substrate 4 is open, it may be a shape having an opened lid. In that case, a lid (not shown) connecting the tubular portions 443 of the front half and the back half is formed on either the front half or the back half. Or a lid divided into each of the front half and the rear half, respectively, and each lid joins the respective longitudinal stitch rows.

Since the knitted fabric 4 is also superimposed on the knitted fabric 40a, 40b so as to conform to each other in the fourth embodiment, the shape of the tubular portion 43 is also superimposed. The knitted substrate 4 is arranged so that the inlaid yarn 70 is orthogonal to the warp yarn 71 and the warp yarn 72 over the entirety of the knitted fabric 4 (Fig. 4 (A)). The tubular portion 43 is also in a state in which the inlay yarns 70 are orthogonal to each other.

The present invention is not limited to the above-described embodiments, but can be appropriately modified and carried out within the scope not departing from the gist of the present invention.

1, 2, 3, 4:
10a, 10b, 20a, 20b, 30a, 30b, 40a, 40b:
11: Top side 12: Bottom side 13: Side
21: edge portion 22: convex portion
31: edge portion 32: tightening portion 33: tubular portion
41: edge portion 42: tightening portion 43: tubular portion
60: Fleece
70: Inlay yarn 71: Weft yarn 72: Warp yarn
70s: straight portion 70r: return portion
100, 200, 300, 400: Basic type paper
111: top side 112: bottom side 113: side
221: edge portion 222: convex portion
331: edge portion 332: tightening portion 333: tubular portion
441: edge portion 442: tightening portion 443: tubular portion

Claims (6)

A method of forming a knitted base material by using a weaving machine,
The inlay yarn made of reinforcing fibers is inserted in the knitting width direction while corresponding to the basic type paper (base type paper) serving as the basis of the knitting fabric to be knitted in the flat knitting machine, A step of forming a first knitted fabric by knitting a fabric part of the first knitted fabric,
In the above basic form, the base knitted fabric portion is knitted by the knitting yarn while inserting the inlaid yarn made of the reinforcing fiber in the knitting widthwise direction in correspondence with the basic fabric in a direction different from the knitting in the process? Process β,
The step of superimposing the first knitted fabric and the second knitted fabric so that their shapes match each other
Wherein the knitted fabric is formed by knitting.
The method according to claim 1,
Wherein at least a part of the base knitted fabric is knitted so that the number of stitches in the knitting width direction is different in the wale direction in the step a and the step b.
In the knitted base material constituted by a plurality of knitted fabrics,
Wherein each of the knitted fabrics comprises knitting yarn for knitting a base knitted fabric portion and an inlay yarn inserted in the knitting width direction and made of reinforcing fibers,
Wherein at least two knitted fabrics constituting the knitted base material are stacked so that orientation directions (orientation directions) of the inlay yarns are different from each other.
The method of claim 3,
Wherein the inlay yarn includes a straight portion and a return portion that is returned from the straight portion and is connected to the next straight portion at a knitting width direction end portion of the knitted fabric. .
The method according to claim 3 or 4,
Wherein the knitted fabric has an area in which at least a part of stitches in the knitting width direction are different from each other in the wale direction.
1. A fiber reinforced plastic comprising a base material made of a resin and a fiber base material reinforcing the base material,
Wherein the fiber substrate is a knitted fabric substrate of any one of claims 3 to 5.

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