JPS5892555A - Laminate for resin reinforcement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fabric for fiber reinforced resin. In fiber reinforced resin (hereinafter referred to as FRP), textiles are generally used as the reinforcing fiber material.The most common method for producing FRP is to use multiple sheets of textiles. impregnating the fabric with a material such as a thermosetting resin, and then curing the resin;
However, woven fabrics are directional, and although they have strong mechanical strength in the vertical and horizontal directions, they have weak mechanical strength in the diagonal direction, so they have a drawback. Therefore, by layering fabrics in diagonal directions,
It is conceivable to use a triaxial fabric.

However, the method of laminating fabrics in the diagonal direction is
This is not a preferred method because it generates a lot of cutting waste, which increases costs, makes it difficult to produce efficiently, and tends to cause distortion during handling. In addition, normal triaxial fabrics are
There are many gaps between the yarns, making it impossible to increase the thread density, resulting in fabrics that are unsatisfactory in terms of strength.In addition, the fabric surface has many irregularities.9
When stacked, the porosity increased and the φ diameter was not desirable.

The object of the present invention is to improve the above-mentioned drawbacks, and to provide a resin-reinforced woven fabric which is preferably long, has a high fiber packing density, has a relatively flat surface, has excellent dimensional stability, and is easy to handle. To provide a laminate containing.

That is, the present invention provides a multilayer fiber laminate for fiber-reinforced resin in which at least one layer is composed of yarns in at least 3' directions of A, B, and C, and (a) yarns A and yarns in the surface direction of the laminate. B is laminated in a diagonal direction.

The yarns A and B are laminated without intersecting each other in the thickness direction of the laminate, and the yarn C is arranged so that the laminate of yarns A and B is systematically integrated. It has been passed.

C. Yarn A and yarn B have a thickness of 300 dens or more, and yarn C has a thickness of 1μ or less of the thinner of yarn A''! or yarn B. The resin-reinforced laminate is characterized in that it has a woven fabric, at least one other layer is a woven fabric, and these are integrated.

This is one of the constituent elements of the present invention. First, a laminate consisting of at least one layer of three yarns will be described.

The laminate is composed of yarns in at least three directions, A, B, and C. That is, at least yarns A and B are used to strengthen the fabric in the diagonal direction, and at least yarns C are used to strengthen the fabric in the diagonal direction.
is used to integrate the laminate of A and B, and constitutes one textile as a whole.0 Of course, the above A
, B, and 0 may optionally be added.

The intersecting angle between A and B in the surface direction of the fabric may be any angle, but is preferably 65 to 115 degrees, more preferably 75 to 105 degrees, particularly preferably 85 to 9
It is 5 degrees. - This is preferable because it improves the strength in the oblique direction.

Further, the crossing angle between yarn/strand C and yarn A or B should preferably be 32.5 to 57.5 degrees, more preferably 37.5 to 52.5 degrees, particularly preferably 42. 5-47
．． It is 5 degrees. This is preferable because it improves the strength in the oblique direction as described above.

Next, yarns A and B need to have a thickness of 300 denier or more. If the thickness of A or B is less than 500 denier, productivity is poor, and the thickness of the fabric cannot be increased, making it impossible to make a highly tenacious fabric in one process. The preferred thickness is 1000 deniers or more.

Further, it is preferable that yarns A and B have the same thickness. Further, the thread C needs to have a thickness of 1 μm or less, preferably 1/6 or less, of the thinner thread A or B.

This is necessary to prevent the formation of voids in the surface direction and thickness direction of the fabric.

Next, in the woven fabric used in the present invention, yarns A and B are laminated without intersecting each other in the thickness direction of the woven fabric. In other words, the warp and weft yarns do not intertwine vertically to form a structure like normal fabrics made of warp and weft yarns.9. They are simply stacked in a diagonal manner. As a result, it is possible to obtain a highly strong fabric with a small tissue porosity and a flat surface. The yarn C is inserted as a weft thread so as to integrate the carcass A and B together. Therefore, yarn C passes alternately above and below the intersection of A and B. A
The laminate consisting of B and B is integrated. Any number can be selected for the number of threads C passing through the intersection of A and B on the upper side of the fabric or the lower side of the fabric,
The preferred number of steps is 1 to 5. If the number of jumps is too large, the zero structure becomes weak, making it difficult to handle as a fabric or laminate.

This is not preferable since the physical properties become extremely poor.

In the present invention, known reinforcing materials can be used as the fiber material, but preferably one or more selected from yarns A and B, reflex fibers, polyvinyl chloride fibers, and cellulose fibers, or 142 or more types. do.

Next, the fabric used in the present invention will be explained according to the drawings. FIGS. 1 and 3 show one example of a preferred fabric of the present invention.

In FIG. 1, the parallel yarn group A and the parallel yarn group B are orthogonal to each other and are therefore laminated at an angle of approximately 90 degrees. The yarn C passes above or below the intersection of A and B to integrate the whole.

This makes it possible to reduce the gaps between the A yarns, the gaps between the B yarns, and the gaps between the A yarns and the B yarns.

Next, in the present invention, at least A and B described above.

A woven fabric is layered on a laminate made of C yarns.

It is integrated. The woven fabric may be a woven fabric consisting of at least A, B, (!) yarns.

It may be a woven fabric consisting of warp and weft yarns or a known triaxial woven fabric. Preferably it is a woven fabric consisting of warp and weft yarns. The reason for this is that at least A, B, and C
Fabrics made of threads have excellent strength in the diagonal direction, and fabrics made of warp and weft yarns have excellent strength in the orthogonal direction, that is,
These two types have excellent strength in the vertical and horizontal directions.
This is because by integrating two pieces of fabric, the strength in all directions can be improved.

Any means of integration may be used.

For example, bonding with resin, prepreg, stitching, integration using metal fittings such as "Stapler" (registered trademark, trademark), etc. can be employed. Particularly preferred is stitching. This is because it can improve the strength of the integration between the laminated layers, is less likely to cause peeling between the layers, and is easy to install on an industrial site and has good workability.

FIG. 2 shows a multilayer laminate of the present invention.

T indicates a fabric consisting of the A, B, and O yarns, W indicates a fabric consisting of warp and weft yarns, and C indicates a model in which these two layers of fabric are sewn together by sewing thread S. be.

The fabric of the present invention can be manufactured using an apparatus as shown in FIG. In Figure 4, the axis 1!1 perpendicular to the horizontal plane
The yarn 4 (corresponding to the M yarn and B yarn) wound around the beam 2.3 set on the frame 1, which is rotatable around the frame, is pulled out downward.

It is opened for each repeat by a belt 5 that is movable back and forth. The belt 5 also moves in parallel by one stitch per rubito, causing the thread to run diagonally. Next, the weft thread (C thread) is inserted and beaten in the tissue forming section 7, and is taken up by the gripping roller 9. At the same time, a fabric 8 having a normal warp and weft structure is supplied to the gripping roller 9, and is taken up while being laminated with the triaxial fabric from above, and then sewn together with a sewing needle 10 to form an integrated laminate. The distance between stitches formed by the sewing needle is preferably 5 to 25 m1m.

The seams are arranged in the longitudinal direction of the fabric in the form of almost straight ridges, and C
It is preferable that the pattern is perpendicular to the thread, but a zigzag pattern may also be included.

To illustrate yet another aspect of the invention, textile textures are represented symbolically. In the following drawings, 9 points indicate that the C yarn passes above and on the side of the intersection of the AB yarns (i.e., the front side when looking at the fabric from above), and V5 indicates that the C yarn passes below the intersection point (
In other words, this shows that the C thread passes through the same back side. Third (
1) The figure shows the same organization as in Figure 1, with sections 5 (2) to 6 (3)
) The figure shows another example of a fabric made of A, B, O, and yarns used in the present invention.

In these figures, A yarn, B yarn beam [100 to 5
The C yarn is most preferably about 100 to 10o-o denier.

Further, the multilayer fabric of the present invention may be used for FRP either in one piece or in a stack of about 2 to 10 pieces. Further, when a plurality of sheets are laminated, they may be integrated by sewing means using a sewing machine or the like. Furthermore, it is laminated with a fabric made of ordinary warp and weft yarns to create FR.
It can also be used for P.

The present invention will be explained below using Examples.

In Examples, the porosity was measured by the following method.

[Porosity measurement method]

The thickness of the fabric when it is sandwiched between two flat plates and a load of 300g/♂ is applied! , the area of the fabric is S.

When the true volume of textile fibers is V, the porosity R=
1 (v/z-s) Example Two twisted yarns of glass fiber 2200D (400fil) (lower side + Jai OOT/m, upper side F v number 90 T/
” ) (!: L-These are used as A and B yarns, glass fiber 202D (5 of 11) is used as C yarn, and χ is made using a 3-axis machine, B yarn density is 4.4 pieces/ro, C yarn density is 3.1 book/a
A triaxial fabric having the structure shown in FIG. 1 of I+ was made. to this,
Plain woven fabric made of the same material as A and B yarns (warp x width density 5
×5 pieces/■) were laminated so that the weft yarn and the C yarn were almost parallel, and they were sewn together with 100D glass fiber. The stitches were perpendicular to the direction of the C thread, and the distance between each stitch was 1. Stitch was 1.5′ m/m.

It is a laminate made of a structurally stable fabric.

The porosity of this fabric was 0.63. 20 pieces of this cloth
An excellent pseudo-isotropic thick FRP plate was obtained by impregnating an epoxy resin into a thick structure made by stacking the sheets and integrating them by stitching, and then curing it. The tensile strength of this thick plate is 16.51cg/f [1IIl" vertically, 15.21cg/mm" horizontally, diagonally (45 degrees) 1! 1
．． 8 kg/mm".

[Brief explanation of the drawing]

Fig. 1 shows a laminate of the present invention, Fig. 2 shows a multilayer laminate of the invention, Fig. 6 shows another example of the laminate of the invention, and Fig. 4 shows an example of the manufacturing process of the invention. . A, B, O: Thread W, T: Fabric S: Suture thread
1:7-Rem 2.3: Yarn beam 5
: Belt 7: Tissue forming part 8: Textile patent applicant Toshi Co., Ltd. Figure 2, Figure 3 (Z) Figure 3 [3]

Claims (1)

[Scope of Claims] (In a multilayer fiber laminate for fiber reinforced resin. At least one layer consists of yarns in at least six directions A, B, and C, and (a) yarns A in the surface direction of the laminate. Yarn B is laminated in an oblique direction. Yarn A and yarn B are laminated without crossing each other in the thickness direction of the laminate, and yarn C is laminated with yarn A. It is passed through so as to systematically integrate the laminate with yarn B. C. Yarn A and yarn B have a thickness of 300 denier or more, and yarn C has a thickness of 300 denier or more, and yarn C is a yarn. □It is a laminate composed of yarns having a thickness of 1/4 or less of the thinner yarn of yarn A or yarn B, and at least one other layer is a woven fabric, and these are integrated. A resin-reinforced laminate characterized by: (2) A woven fabric in which the woven fabric consists of warp yarns and weft yarns; or 3.
Claim No. (1) characterized in that it is a shaft fabric.
The resin-reinforced laminate described in Section 1. (3) The resin-reinforced laminate according to claim (1), wherein the woven fabric and the laminate are joined together by stitching. (4) The resin-reinforced laminate according to claim (1), characterized in that the thread I passes through the intersection formed by the threads A and B in 1 to 5 steps. 0(5) Yarns A, B, or C are carbon fibers, glass fibers, silicon fibers, polyester fibers, polyamide fibers, boria 7-grade fibers, polyolefin fibers, and polyvinyl chloride fibers. , one or two selected from cellulose fibers
Claim No. (1) characterized in that it consists of more than one layer.
) The resin-reinforced laminate described in item ).