JPH10325061A - Production of reinforcing material for composite structural material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an open mesh reinforcing material generating no joint shifting. SOLUTION: A guide plate 21 having guide grooves 21a, 21b formed in length and breadth directions is used to set multifilament yarns 11 comprising high tenacity fibers into each of the guide grooves 21a, 21b. Each joint of the multifilament yarns 11 is adhered through an adhesive. A sheet-formed product is obtained by taking out the whole from the guide plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fiber reinforced plastic (FRP) and a fiber reinforced concrete (FRC).
The present invention relates to a method for producing a reinforcing material for a composite structural material that can be suitably used for such a composite structural material.

[0002]

2. Description of the Related Art A reinforcing material used for a composite structural material preferably has an open mesh network in order to smoothly impregnate a matrix material and form a strong integrated structure.

[0003] In order to realize a predetermined open mesh, a conventional reinforcing material is used for weaving a warp or a weft made of high-strength fiber into a woven structure such as a plain weave, a satin weave, or a twill weave.
Sometimes entangled fabric. In addition, the usual entangled fabric,
Since a set of two warps may be entangled by the warp, the warp may be unduly bent and impair the high-strength characteristics of the fiber. A method of entangled with a weft has been proposed (Japanese Unexamined Patent Publication No.
-40834).

[0004]

According to the conventional technique, a special entangled loom is required for weaving.
The disadvantage of low productivity is inevitable. Further, the tension of the added yarn added to each warp is limited to a minimum in order to avoid bending of the warp, and as a result, the binding force of the warp to the weft tends to be insufficient. There was a problem that it was troublesome.

Accordingly, an object of the present invention is to provide a high productivity by bonding the intersections of multifilament yarns arranged in different directions in view of the problems of the prior art, thereby causing misalignment at each intersection. It is an object of the present invention to provide a method for producing a reinforcing material for a composite structural material without fear.

[0006]

According to a first aspect of the present invention, there is provided a multi-layer guide comprising a plurality of parallel guide grooves formed in a plurality of directions on a guide plate. The gist of the present invention is to accommodate the filament yarn in each direction and to bond the intersections of the multifilament yarn.

The multifilament yarn in one direction can be divided into a plurality of times and stored in the guide groove.

[0008] The structure of the second invention is that a multifilament yarn composed of a plurality of high-strength fibers is arranged in different parallel planes to form a warp group and a weft group, and the warp group runs intermittently in one direction. The gist of the present invention is to make the weft yarn groups cross and contact each other and bond the intersections.

[0009]

According to the structure of the first aspect of the invention, the multifilament yarns composed of high-strength fibers are arranged in different directions by being housed in the guide grooves of the guide plate in each direction, so that the multifilament yarns are arranged at different pitches of the guide grooves. A regular mesh can be formed at the same time. Then, if the intersections of the multifilament yarns are bonded, the whole can be completed in an integrated sheet shape.

Here, the high-strength fiber is any high-strength, high-elasticity fiber that can be used as a stress-sharing element in a composite structural material. Examples thereof include pitch-based or PAN-based carbon fiber, glass fiber, and boron. Fiber, alumina fiber, potassium titanate fiber, silica fiber, Tyranno fiber, zirconia fiber, silicon carbide fiber, polyacrylonitrile fiber, polyacrylate fiber, aramid fiber, wholly aromatic polyester fiber, ultra high molecular weight polyethylene fiber, high strength vinylon fiber And high-strength acrylic fiber. These fibers can be used as a multifilament yarn having an arbitrary fineness by arranging filaments of any single yarn thickness in parallel and, for example, carbon fiber, glass fiber, alumina fiber, etc. have a diameter of about 5 to 10 μm. 1000 to 36
It is preferable to collect about 000 pieces. It is preferable that the aramid fiber or the like is formed by assembling single yarns of 1 to 5 d / fil and having a total denier of several thousand to several 10,000 d. The multifilament yarn has a width of several mm and a thickness of 0.1 mm.
It is preferable to make the cross-section rectangular about 1 to 0.4 mm.

The adhesive used for bonding the intersections of the multifilament yarns has sufficient fluidity so that the intersections of the multifilament yarns can be sufficiently impregnated at the time of bonding. Examples of such adhesives include hot melt adhesives based on various thermoplastic resins as base polymers, instantaneous adhesives based on cyanoacrylates, and various thermoplastic resins themselves, for example, polyamides such as nylon 6 and polyethers. In addition to engineering plastics such as imide, polysulfone, polyetheretherketone, and polyamideimide, general-purpose plastics such as polyethylene, polystyrene, and polycarbonate can be widely used. A predetermined amount of these adhesives can be discharged or ejected onto each intersection of the multifilament yarn on the guide plate by a robot equipped with an appropriate adapter, and each intersection can be adhered.

If the multifilament yarn in one direction is divided into a plurality of times and stored in the guide groove, the multifilament yarn on the side to be divided into a plurality of times can sandwich the multifilament yarn in the other direction from above and below. , And the overall integrity can be further improved. At this time, the intersections of the multifilament yarns may be bonded each time when the multifilament yarns are stored separately, or may be bonded together at the end after all the multifilament yarns are stored.

According to the second aspect of the invention, the warp yarn group intermittently travels in one direction and the weft yarn group is crossed and brought into contact with each other. There is no substantial limitation on the length, and the productivity can be further improved. Each time the intersections are bonded, the entire weft group is cut to prepare for the next crossing and bonding operation. The high-strength fibers and the adhesive used here are exactly the same as those in the first invention.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

A method of manufacturing a reinforcing material for a composite structural material includes a number of parallel guide grooves 21a, 21a,.
b, 21b... are formed, and the multifilament yarn 1 is inserted into each of the guide grooves 21a, 21b.
1, 11,... Are stored (FIGS. 1, 2).

The guide plate 21 is a flat plate having an arbitrary thickness. On the upper surface of the guide plate 21, guide grooves 21a, 21a..., 21b, 21b.
Are orderly formed for each of the pitches Pa and Pb. Each multifilament yarn 11 is formed to have a predetermined fineness by assembling filaments of high-strength fibers. The guide grooves 21a and 21b are formed so as to conform to the cross-sectional shape of each multifilament 11.

The multifilament yarns 11, 11... Are guided by guide grooves 21a, 21a.
b ... are stored in the vertical and horizontal directions (FIG. 3). That is, in the same figure, the multifilament yarns 11, 11... Indicated by the reference numerals are first stored in the vertical guide grooves 21a, 21a. It shall be stored in the grooves 21b.

Next, the multi-filament yarns 1
When an appropriate amount of adhesive is dropped or sprayed onto each intersection 12 of 1, 11,... And solidified, the multifilament yarn 1
1, 11, ... are guide grooves 21a, 21a of the guide plate 21.
.., 21b, 21b.
2 are adhered and can be finished into an integral sheet. Therefore, the entire structure may be removed from the guide plate 21 and used as a reinforcing material for the composite structural material. The adhesive is
It is assumed that those having good adhesiveness to the multifilament yarns 11, 11,... While having extremely low adhesiveness to the guide plate 21 are selected. The guide plate 21 is made of an appropriate material to reduce the adhesiveness of the adhesive.
Alternatively, it is preferable to perform an appropriate surface treatment.

In the above description, the guide plate 21 has the longitudinal guide grooves 21a for accommodating the multifilament yarns 11, 11... First and the lateral guide grooves 21a for accommodating the multifilament yarns 11, 11. Guide groove 21
b, 21b... may be formed deeper (FIG. 4). However, the depths d1, d2 of the guide grooves 21a, 21b are d1
> D2, and d2 ≧ t1 and d1−d2 ≦ t1 with respect to the thickness t1 of the multifilament yarn 11.

Further, guide grooves 21a, 2
1a..., 21b, 21b.
It may be Pb or Pa ≠ Pb. Also, the multifilament yarns 11, 11... May all have the same fineness, or may have different fineness for each of the guide grooves 21a, 21a,. In the latter case, each of the multifilament yarns 11 in the vertical and horizontal directions,
11 may be set to a fineness proportional to the pitches Pa and Pb, respectively.

[0021]

[Other Embodiments] Multifilament yarns 11, 11,...
Is divided into a plurality of times in one direction so that the guide grooves 21a, 21a
, 21b, 21b ... (FIG. 5).

For example, in FIG. 1A, the multi-filament yarns 11, 11... In the horizontal direction are given in the guide grooves 21b, 21b. Multifilament yarn 1 in direction
Are stored in the guide grooves 21a, 21a,
It is shown that the reference numerals are stored in the guide grooves 21b, 21b,. In the same figure (B), the multifilament yarns 11, 11... In the vertical direction and the horizontal direction are denoted by reference numerals, respectively.
It is illustrated that each part is stored twice.

The guide plate 21 may be formed with guide grooves for accommodating the multifilament yarns 11, 11,... In three or more directions. For example, FIG. 6 shows a case where the multifilament yarns 11, 11,... Are arranged in three directions via guide grooves (not shown) formed in three directions.

In general, each multifilament yarn 11 is formed by arranging a predetermined number of filaments in parallel, but may be lightly twisted as a whole to prevent the filaments from scattering, and may be formed with a coarse pitch. a, the covering yarn 11a for protection may be covered (FIG. 7). These techniques are based on each multifilament yarn 1
This is particularly effective when the fineness of 1 is large.

Guide grooves 21a formed in the guide plate 21;
21b can be formed via left and right parallel ridges 21c, 21c instead of being formed in a concave groove shape (FIG. 8). However, only the guide groove 21a is shown in FIG. Further, one of the guide grooves 21a and 21b may be formed via the ridges 21c and 21c, and the other may be formed in a concave groove shape (FIG. 9). In FIGS. 8 and 9, the cross-sectional shape of each ridge 21 c is formed in opposing quadrants and semi-circles, but it goes without saying that other shapes may be used. .

The reinforcing material for the composite structural material can also be manufactured from a warp group A and a weft group B in which a plurality of multifilament yarns 11, 11... Are arranged in different parallel planes, respectively (FIGS. 10 and 11). ).

The warp group A includes feed rollers 31, 31, 3
It is possible to intermittently travel in one direction via the winding rollers 33 and 32 (in the direction of the arrow in FIG. 10). The reeds 34, 34,..., 3 are provided on the upstream side and the downstream side of the upstream feed rollers 31, 31 in order to regulate the arrangement pitch of the multifilament yarns 11, 11,.
5, 35... Are provided. However, auxiliary reeds 35, 3
.. When the warp yarn group A is run, the downstream side of the upstream feed rollers 31 and 31 (the black circle position in FIG. 11) and the downstream side of the feed rollers 32 and 32 (FIG. (Warm circle position), and when the warp group A is stopped, it can retreat in the opposite direction.

The weft yarn group B is arranged at a position slightly higher than the warp yarn group A in a direction orthogonal to the warp yarn group A or in a direction inclined at an arbitrary angle. The tip of the weft group B is gripped via a fixed clamp 36 and a moving clamp 37 parallel to the warp group A, and the moving clamp 37 is
By releasing the clamp and moving forward, the warp group A
And the weft group B can be pulled out (two-dot chain line in FIG. 10 and solid line in FIG. 11). In addition, after the weft group B is drawn out in this way, by lowering the fixed clamp 36 and the moving clamp 37 simultaneously, the weft group B can be brought into uniform contact with the warp group A.
.. Are arranged behind the fixed clamp 36 in order to regulate the arrangement pitch of the multifilament yarns 11 forming the weft group B.

Then, the auxiliary reeds 35, 35... Are made to stand by on the downstream side of the feed rollers 31, 31, the weft thread group B is pulled out above the warp thread group A via the moving clamp 37, and the fixed clamp 36 and the moving clamp 37 are moved. The weft group B through the warp group A
To each of the multifilament yarns 1
By bonding the intersections of 1, 11,..., A sheet-like reinforcing material having a length equal to the entire width of the weft group B can be formed.
Thereafter, the weft thread group B is cut in front of the fixed clamp 36 while leaving a margin for the moving clamp 37 (FIG. 1).
1 dashed line), fixed clamp 36, moving clamp 37
Is retracted upward, the moving clamp 37 is returned to the original position, and the tip of the weft group B is re-clamped (two-dot chain line in FIG. 11). On the other hand, the warp group A includes feed rollers 31, 31,
32, 32, the weft yarn group B is advanced forward by a distance corresponding to the entire width via the take-up roller 33, and thereafter, by repeating the same operation, the sheet-like reinforcing material is continuously taken up on the take-up roller 33. Can be.

The warp group A has a predetermined tension applied at least between the upstream feed rollers 31 and 31 and the downstream feed rollers 32 and 32, and the weft group drawn out on the warp group A B is at least the moving clamp 3
It is assumed that a predetermined tension is applied between 7 and the fixed clamp 36. On the other hand, the auxiliary reeds 35
When the warp group A travels, the warp group A is moved forward to prevent the arrangement pitch of the multifilament yarns 11, 11,... Of the warp group A in the feed rollers 32, 32 from being disturbed. Therefore, auxiliary reeds 35, 35 ...
May be omitted when there is no disturbance in the arrangement pitch.

In FIGS. 10 and 11, when the intersections 12 of the multifilament yarns 11, 11,... Are bonded, a receiving plate 39 may be provided so as to contact the lower surface of the warp group A (FIG. 12). ). However, the receiving plate 39 has a warp group A,
A small concave portion 39a is formed on the upper surface so as to correspond to each intersection 12 formed by each of the multifilament yarns 11 of the weft group B. That is, a large number of the concave portions 39a are formed on the receiving plate 39 in accordance with the arrangement pitches of the multifilament yarns 11, 11 of the warp yarn group A, the weft yarn group B, and the like. Each concave portion 39a forms a pool of adhesive when the intersection 12 of the multifilament yarns 11, 11 is bonded by discharging or jetting a hot melt adhesive or the like from a nozzle (not shown). Excess adhesive is prevented from flowing far from the intersection 12 along the line 11.

[0032]

As described above, according to the first aspect of the present invention, a multifilament yarn is stored in a plurality of guide grooves formed in a guide plate, and each intersection is bonded. Since each intersection can be sufficiently strongly bonded through an adhesive, there is no risk of misalignment, and there is no need to use a special entangled loom, and high productivity can be realized. In addition, since each multifilament yarn is not impregnated with an adhesive except at the intersections, it has much better integration with the matrix and forms a woven fabric structure as compared to a prepreg that is entirely impregnated with resin. Therefore, there is an excellent effect that there is no possibility of impairing the high strength properties of the fiber.

According to the second aspect, the length of the warp group in the direction is not limited, and a series of process operations can be easily automated, so that productivity can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a manufacturing process.

FIG. 2 is an enlarged cross-sectional view corresponding to line XX of FIG. 1;

FIG. 3 is a schematic diagram showing a manufacturing process.

FIG. 4 is an enlarged sectional view of a main part showing another embodiment.

FIG. 5 is a view (1) corresponding to FIG. 3, showing another embodiment.

FIG. 6 is a diagram (2) corresponding to FIG. 3, showing another embodiment.

FIG. 7 is an enlarged perspective view of a main part showing another embodiment.

FIG. 8 is a diagram corresponding to FIG. 2, showing another embodiment.

FIG. 9 is a view corresponding to FIG. 1, showing another embodiment.

FIG. 10 is an essential part perspective view showing another embodiment.

11 is an explanatory plan view of FIG. 10;

FIG. 12 is an enlarged explanatory view of a main part showing another embodiment.

[Explanation of symbols]

 A: warp yarn group B: weft yarn group 11: multifilament yarn 21: guide plates 21a, 21b: guide groove

Claims (3)

[Claims] 1. A multi-filament yarn made of high-strength fiber is accommodated in each of a plurality of parallel guide grooves formed in a plurality of directions on a guide plate, and each intersection of the multi-filament yarn is bonded. A method for producing a reinforcing material for a composite structural material. 2. The method according to claim 1, wherein the multi-filament yarn in one direction is divided into plural times and stored in the guide groove. 3. A warp group and a weft group formed by arranging multifilament yarns composed of a plurality of high-strength fibers in different parallel planes, and intersecting the warp group with the warp group running intermittently in one direction. A method for producing a reinforcing material for a composite structural material, characterized in that the reinforcing members are brought into contact with each other and each intersection is bonded.