JPH07861B2 - Method of manufacturing mesh fabric for composite material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a mesh fabric used as a reinforcing material when producing a fiber-reinforced composite material such as a fiber-reinforced cement.

BACKGROUND OF THE INVENTION It is well known to use reinforcing fibers in the form of fabrics when making fiber reinforced composite materials. And, in fiber reinforced cement, unlike other fiber reinforced composite materials such as fiber reinforced plastics, the number of warps and wefts per cm is extremely small at 2 or less, and is called a grid-like mesh fabric. Coarse textiles are used. However, since such mesh fabric has very coarse eyes as described above, the binding force between warp yarns and weft yarns is very weak, and the form is unstable and difficult to handle. Therefore, as described in, for example, Japanese Patent Laid-Open No. 61-34244, the warp and the weft are blocked with a thermoplastic polymer at the crossing portion thereof to stabilize the shape.

By the way, instability of the form occurs not only during use but also during manufacture. That is, since the mesh woven fabric has a very low warp density, when the warp makes an opening movement, the tension applied to the warp acts even on the weft inserted immediately before, and the weft is bent greatly. However, if the weft is blocked while the weft is bent, the properties of the reinforcing fiber will not be sufficiently exhibited when the fiber-reinforced composite material is formed.

In order to solve such a problem, it is conceivable to use a temple as described in, for example, "Riki Loom", pages 168 to 170, published by Sangyo Tosho Co., Ltd. However, when the elongate is used, since the mesh fabric has a very weak binding force between the warp and the weft as described above, only the warp caught on the elongate pin moves in the width direction of the fabric, and The bend is not corrected.

Further, if the weft yarn is folded back at the selvages, as in the case of using a shuttle loom, in order to effectively operate the above-mentioned elongation, the outermost warp yarns of the fabric will spread in the width direction at the same time. Although the weft is tense, especially when the woven yarn is very weak against bending like carbon fiber, many yarn breakages occur at the intersections of the warp and the weft. In addition, when the weft is folded back at the selvage, there is a problem that even if a tension is applied by an elongate member, the weft is not orthogonal to the warp and becomes zigzag, and a desired mesh fabric cannot be obtained.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned problems of the conventional method, prevent the weft from bending, and obtain a fiber-reinforced composite material having excellent properties. The present invention provides a method for producing a mesh fabric that becomes.

(Means for Solving the Problems) In order to achieve the above object, the present invention uses a loom,
In producing a mesh fabric having reinforcing fiber yarns as warp yarns and weft yarns, the weft yarns are cut at each striking to form tufts, and only the weft yarns described above are cut while the take-up operation of the obtained fabric fabric is stopped. Provided is a method for manufacturing a mesh fabric for a composite material, characterized in that the both ends of each book are gripped by a chuck to make them tense to correct the bending of the weft. The reinforcing fiber yarn is preferably carbon fiber yarn.

In the present invention, a rapier loom, an air jet loom, or the like is used as the loom. Usually, a rapier loom is used.

Although the woven structure may be any of a flat structure, a satin structure, a twill structure, etc., in the production of a plain structure woven fabric, that is, a plain woven fabric, weft bending is particularly likely to occur. for that reason,
It is particularly effective when manufacturing plain weave.

Reinforcing fiber yarns that constitute warp yarns and weft yarns are made of high-strength, high-modulus fibers such as carbon fibers, glass fibers, and polyaramid fibers. The method of the present invention is particularly effective for producing a mesh fabric having carbon fiber yarns, which are weak against bending, as warp and weft yarns.

By the way, the weft yarn is driven into between the warp yarns at the time of opening the warp yarn as in the normal weaving operation.
The weft is cut after each driving to form a tuft.
In addition, it is preferable that the selvages of the same kind or different kinds as the warp are closely arranged in the selvages because the weft spacing becomes more stable.

The resulting mesh fabric is intermittently taken up and taken up by a winding tube. While the take-up operation is stopped, the weft yarns are held as close as possible to the take-up roll, and the weft yarns are gripped one by one at both ends of the weft yarn by the chucks and tensioned. Correct the weft meandering that has occurred during manufacturing. The reason why the weft thread is gripped and tensioned while the take-up operation is not performed is that the weft thread may be bent instead of being performed during the take-up operation. As the chuck, a fast-moving chuck such as an air chuck or an electromagnetic chuck is preferable. It should be noted that the interlocking of the weft thread holding operation, the tension operation and the take-up operation can be easily performed by detecting the manufacturing cycle using an optical sensor or the like.

(Embodiment) Fig. 1 shows a state in which a mesh fabric is manufactured using a rapier loom, in which a warp 1 is passed through a pair of healds 2 and 2, and further passed through a reed 3. Then, heddle 2,
When the warp yarns 1 are opened by moving in the vertical direction in which the warp yarns 2 are separated from each other, a weft yarn 5 is formed between the opened warp yarns by the rapier 4.
Is driven. The weft yarn 5 is cut after each driving.

At the same time as the reed 3 moves forward, the take-up roll 8 consisting of a set of three rolls 8a, 8b, 8c is actuated, and the fabric is wound around the winding tube 9.

The winding operation is completed when the reed 3 is at the frontmost position,
The fact that the reed 3 is located at the frontmost position is detected by the reflecting mirror 6 and the optical sensor 7 attached to the reed 3, and a pair of grips and tensions made up of the air chuck 10a and the air cylinder 10b by a program sequencer (not shown) or the like. The means 10 and 10 are operated, and only the weft 5 is gripped one by one at both ends thereof,
Tension it and correct the bend. This operation is repeated to produce a woven fabric.

FIG. 2 shows the movement of the gripping / tensioning means.
Shows a state in which the air chuck 10a is advanced to the gripping position by the air cylinder 10b, and FIG. 6B shows a state in which the air chuck 10a grips the weft 5 at its end portion at the advanced position. The air chuck 10a is then retracted by the air cylinder 10b while holding the weft yarn 5 as shown in (C), and the tension and bending of the weft yarn 5 are corrected. (D) shows a state in which the tension of the weft 5 and the correction of the bending are completed and the air chuck 10a is opened. Both of the pair of gripping / tensioning means may be movable, or one of them may be fixed and only the other may be movable.

FIG. 3 shows the ears of the fabric before gripping and tensioning the wefts. The wefts 5 form the tufts and the ends are the selvages.
It is located 10 to 20 mm outside of 11.

In the above embodiment, as described in JP-A-61-34244, for example, a low melting point polymer thread such as a thin low melting point nylon is wound around the warp, or is fed in parallel with the warp, After gripping and tensioning the
If the low melting point polymer yarn is softened or melted by winding before winding and the warp yarn and the weft yarn are joined at the intersecting portions of these to perform the sealing, it is possible to completely prevent the disorder of the shape thereafter. Like

(Effect of the Invention) In the method of the present invention, when the reinforcing fiber yarn, preferably the carbon fiber yarn is used as the warp yarn and the weft yarn to manufacture the mesh fabric, only the weft yarn is removed during the rest of the take-up operation of the obtained fabric.
To obtain a mesh fabric that can fully develop the properties of reinforcing fibers when manufacturing fiber-reinforced composite materials, since the bending of the weft yarn is corrected by gripping each end of the book with a chuck and tightening them. Will be able to. In addition, since the weft yarn is cut to form the tufts at each driving, there is a problem in that the weft yarns are arranged zigzag without being orthogonal to the warp when the weft yarn is gripped and tensioned. Will be able to prevent.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a loom showing a state in which a mesh fabric is manufactured by the method of the present invention, and FIG. 2 is a grasping / tensioning means showing the movement of the weft holding / tensioning means in order. And FIG. 3 is a schematic plan view of the woven fabric before the gripping and tensioning operations. 1: warp 2: heddle 3: reed 4: rapier 5: weft 6: reflecting mirror 7: optical sensor 8: take-up roll 8a: roll 8b: roll 8c: roll 9: winding tube 10: gripping / tensioning means 10a: air chuck 10b: Air cylinder 11: Ear thread

Claims (2)

[Claims] 1. When producing a mesh fabric using reinforcing fiber yarns as warp yarns and weft yarns using a loom, the weft yarns are cut at each time of striking to form tufts, and at the same time, a weaving operation of the obtained fabric is performed. A method of manufacturing a mesh fabric for a composite material, comprising: bending the weft yarns while holding only one of the weft yarns at a time by a chuck at both ends of the weft yarns to make them tense during a pause. 2. The method for producing a mesh fabric for a composite material according to claim 1, wherein the reinforcing fiber yarn is a carbon fiber yarn.