JPH02293434A - Tri-axial fabric and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject tri-axial fabric for a membrane-structured architecture, etc., having a high weaving density and an excellent reinforcing effect by intersecting a group of core yarns from parallel fixed core yarn-supplying units with a group of weaving yarns from oppositely arranged weaving yarn-supplying units alternately situated between the above mentioned core yarn-supplying units in a form of plain weave at the point of action. CONSTITUTION:While a group of core yarns 2 supplied from a group of parallel fixed core yarn-supplying units 7, a group of the first weaving yarns 3a and a group of the second weaving yarns 3b respectively supplied from oppositely arranged plural pairs of the first weaving yarn-supplying unit 11a and the second weaving yarn-supplying unit 11b alternately situated between the above mentioned core yarn-supplying units 7 are made to advance to the point 9 of weaving action, the respective first and second weaving yarn-supplying units 11a and 11b are made to pass through between the respective adjacent core yarn-supplying units 7 in the mutually opposite directions at the point of weaving action in order to mutually intersecting the group of the first weaving yarns 3a, the group of the second weaving yarns 3b and the core yarns 2 in such a plain weave form that the respective core yarns 2 are situated between the group of the first weaving yarns 3a and the group of the second weaving yarns 3b in the weaving direction. Thereby the objective tri-axial fabric 1 composed of the groups of the first and second weaving yarns 3a and 3b passing through between the group of the core yarns 2 spreading in the weaving direction and the respective adjacent core yarns 2 in an aligned state in order and mutually intersecting in a form of plain weave is obtained.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a three-layer fabric that is suitably used as a coating base fabric used in membrane structure buildings, boats, etc., and as a base fabric for molding processing used in diaphragms, etc. This article relates to shaft fabrics and manufacturing methods for manufacturing them. [Prior art] As shown in FIGS. 13 and 14, conventional three-wheeled fabrics include warp yarns 3'a..., 3'b... that are polymerized at a predetermined angle θ (approximately 60 degrees). There is a known fabric in which the fabric is expanded alternately and the weft threads 2' are inserted into the expanded area using a rapier (hereinafter referred to as ``conventional fabric''). This kind of royal textile has threads extending in three directions, so
It has approximately the same tensile strength in all directions and is excellent in tear strength, shear strength, etc.

[Problem to be solved by the invention]

However, in conventional textiles, the weft threads 2'... are arranged parallel to the direction perpendicular to the weaving direction (direction A), so it is not possible to obtain a cylindrical shape, and a flat shape cannot be obtained. You can only get things. Moreover, the reinforcing effect in the longitudinal direction of the fabric, that is, in the weaving direction, is poor. Also, as shown in Figures 13 and 14, both warp threads 3'a
. . , 3'b . In order to intertwine both warp threads 3'a..., 3'b on both sides of each weft thread 2',
Since the movement control point p...TPsa... is formed by..., the weft spacing or each warp spacing is inevitably determined by the thickness of the yarn. That is, the weft pitch cannot be made smaller than the area occupied by the intersection of the warp yarns (the area shaded downward to the right in FIG. 13). The warp spacing cannot be made smaller than the area occupied by the intersection of the weft and the other warp (for example, the area shaded downward to the left in the same figure). Therefore, no matter how you change the thread diameter, number of threads, etc., it is not possible to increase the weaving density beyond a certain level. The present invention has been made in view of this point. Provided is a triaxial fabric that can be manufactured not only in a flat shape but also in a cylindrical shape, has an excellent reinforcing effect in the longitudinal direction, which is the weaving direction, and can increase the weaving density, and also provides a method for easily manufacturing the same. The purpose is to

[Means to solve the problem]

The triaxial fabric of the present invention that solves this problem has a group of core yarns extending in the weaving direction, and first and second groups of yarns that sequentially pass between adjacent core yarns in an oblique manner and intertwine with each other in a plain weave pattern. and,
It consists of In addition, the method of the present invention for producing this woven fabric includes a group of core threads let out from a group of core thread let-out parts fixed in parallel, and a plurality of sets of core yarns disposed opposite to each other with every other core thread let-out part interposed therebetween. While advancing the first and second yarn groups let out from the first and second weaving yarn letting-out portions to the weaving application point, the first and second weaving yarn letting-out portions are moved between the adjacent core yarn letting-out portions. By sequentially passing the fibers in opposite directions to each other, the first yarn group and the second yarn group are intertwined with each other in a plain weave configuration in which each core yarn is sandwiched in the fabric thickness direction at the weaving point. It is something. Generally, when manufacturing a cylindrical woven fabric, the core yarn feeding sections are arranged in a circular manner, so that each of the 2N (N is any natural number) first and second yarn feeding sections is replaced by the 4N core thread feeding sections. It is preferable that the core yarn is arranged in a circular meandering path passing between the core thread delivery parts.In addition, when manufacturing a flat-shaped woven fabric, the core thread delivery parts may be arranged in a C-shape or in a straight line. It is preferable that each of the 2N first and second weaving thread delivery parts reciprocate along a C-shaped or linear meandering path passing between 4N-1 core thread delivery parts. [Function] Due to the weaving form, the core thread and each weaving thread are similar to the weft thread 2 in conventional textiles.
' and corresponding to each warp thread 3'a, 3'b, respectively, but since the core threads extend in the weaving direction, by arranging the core threads in parallel in an annular shape, a cylindrical triaxial It can be made into textiles. Also. The reinforcing effect in the longitudinal direction of the m-piece (in the axial direction in the case of a cylindrical piece) is greatly improved by the presence of the core yarn extending in this direction.

Furthermore, since the first weaving yarn and the second weaving yarn are intertwined with each other in a plain weave form, there is no need to intertwine the core yarn with each weaving yarn, and each core yarn is intertwined with the first weaving yarn and the first weaving yarn. It is simply inserted between the thread and the thread. Therefore, in the direction perpendicular to the core threads, the movement of each core thread is only regulated by one of the adjacent weaving thread entanglement parts, and by passing each core thread through the weaving thread entanglement part, the core thread The spacing or the spacing between each yarn can be significantly reduced. [Example] Hereinafter, the structure of the present invention will be specifically explained based on the example shown in FIGS. 1 to 8. As shown in FIGS. 1 and 2, the triaxial fabric 1 of this example has 4N (
In this embodiment, N=4) core threads 2... and 2N first and second weaving threads 3a...3b diagonally intersecting each other at an appropriate angle θ (approximately 60 degrees in this embodiment) ..., outer diameter 1
It is woven into a cylindrical shape of 0 nn. Each core thread 2 and weaving threads 3a, 3b are as follows. 1500 denier para-aramid multifilament yarn is used.

As shown in FIGS. 2 and 3, the first weaving yarns 3a... and the second weaving yarns 3b... are intertwined with each other. On the other hand, each of the core yarns 2 passes through each of the weaving yarn intertwining portion groups P parallel to each other in the axial direction, and the intervals between the core yarns and the intervals between each of the weaving yarns are extremely small. Next, a method for manufacturing the tricycle fabric 1 will be explained. As a loom for carrying out this method, for example,
A machine with a structure similar to a 32-stroke circular knitting machine is used. That is, as shown in FIGS. 5 to 8, 4N impellers 5 are arranged close to each other in an annular manner on the fixed base 4, and an inner guide groove 6a is formed along the periphery of each impeller 5. ... and an outer guide groove 6b... are formed. Each adjacent impeller 5,
5 are rotated in opposite directions by a drive mechanism (not shown). At the center of each impeller 5, a cylindrical core yarn delivery section 7 is fixedly held so as to be relatively rotatable. Under the base 4, 4N core thread bobbins 8 are arranged corresponding to each core thread payout section 7. A core thread 2 is wound around each core thread bobbin 8.
The core yarn 2 unwound from each bobbin 8 is guided from the core yarn unwinding section 7 to a weaving application point 9 on the base 4. A pair of carrier holding grooves 5a, 5a are formed in the peripheral portion of each impeller 5, and are directly opposed to each other at 180 degrees. As shown in FIG. 7, each of the holding grooves 5a of every other impeller 5 has 2N first and second carriers 10a.
... 10b... is engaged and held. Each of the first carriers 10a... supports a first weaving thread delivery section 11a, which is a bobbin wound with a first weaving thread 3a, and each of the second
The carrier 10b supports a second weaving thread delivery portion 1lb, which is a bobbin around which the second weaving thread 3b is wound. Each thread 3a
, 3b are led to the weaving application point 9 from the respective weaving yarn delivery portions 11a, llb. Each carrier 10a, 10b is moved as the impeller 5 rotates, and when it reaches a point of proximity to the adjacent impeller 5, it is transferred to the holding groove 5a of the adjacent impeller 5. (See Figure 6). Therefore, each carrier 10a, 10
b is moved so as to alternately pass through each of the guide grooves 6a and 6b, and along with this, an annular meandering path 12 in which the yarn feeding sections 11a and llb sequentially pass between the adjacent core yarn feeding sections 7 and 7.
It is made to move at a constant speed along a and 12b. That is,
The first weaving yarn delivery section 11a... is made to follow a first meandering path 12a shown in a solid line in FIG. 8 in a clockwise direction,
The second weaving yarn feeding section 1lb...
It is made to follow the meandering route 12b in a counterclockwise direction. Note that a winding mechanism 13 for winding up the fabric 1 is provided on the weaving application point 9. Therefore, each core thread 2 and weaving thread 3a are wound by the winding mechanism 13.
, 3b in the weaving direction A, the impellers 5... are driven to move the first yarn feeding section 11a... and the second yarn feeding section 1lb... to the meandering paths 12a, 12b. When the core thread is moved in the opposite direction along
a... and the second weaving yarns 3b... are intertwined with each other while successively passing between the adjacent core yarns 2, 2. As a result, at the weaving point 9, a cylindrical triaxial fabric 1 as shown in FIGS. 1 and 2 is woven. and,
This triaxial fabric 1 is sequentially wound up by the winding mechanism 13. This winding speed is the weaving direction A of each yarn 2, 3a, 3b.
This is the advancing speed of the weaving yarn feeding section 11a, llb.
From the relationship with the accompanying speed of weaving yarn 3a. The intersection angle of 3b is determined. Further, the triaxial fabric 1 according to the present invention can also be made into a flat-shaped fabric having the weaving structure shown in FIG. Such a flat triaxial fabric can be woven using a loom such as that shown in FIG. 9 or FIG. 11 in the same manner as in the above embodiment. Both looms have the same structure as that of the previous embodiment in principle, but in the loom shown in FIG.
=4) small-diameter impellers 5 similar to the above impellers and two large-diameter impellers 5', 5' are arranged close to each other in a C-shape, and each impeller 5,
A core yarn feeding section 7 is arranged at the center of the 5'. A retaining groove 5 in the small diameter impeller 5 is provided at the peripheral edge of each large diameter impeller 5'.
Three retaining grooves 5'a with the same spacing as the gaps a and 5a.
... is formed. The holding grooves 5a..., 5'a... of the impellers 5..., 5'... each have 2N first grooves.
and second carriers 10a..., 10b... are held.

Thus, each first carrier supported by each carrier loa, 10b
As shown in FIG. 10, the second weaving thread delivery parts 11a and llb pass each large-diameter impeller 5' on C-shaped meandering paths 12a and 12b that intersect between the adjacent core thread delivery parts 7 and 7. It can be reversed and moved back and forth in the direction of the arrow. In addition, in the loom shown in Fig. 11, 4N is applied to the long rectangular base 4.
-3 (N=3 in this embodiment) small diameter impellers 5... and two large diameter impellers 5', 5' are arranged close to each other in a straight line. Thus, each of 2N first and second yarn feeding sections 11a
. . , 1lb, . . . are configured to be reciprocated in the direction of the arrow by being reversed by each large-diameter impeller 5' on linear meandering paths 12a and 12b, as shown in FIG. .

According to each of these looms, 4N-1 core yarn 2... and 2N weaving yarns 3a..., 3b... each form a flat three-dimensional weaving structure as shown in FIG. It is possible to weave shaft fabrics. In either case, the selvage of the fabric is formed by the reversing action of the large-diameter impellers 5' of the yarn feeding sections 11a and Llb. By the way, 1 5 0
Thickness of the flat fabric according to the present invention obtained using 0 denier para-aramid multifilament yarn and having the weave structure shown in FIG. 2 and the conventional fabric having the weave #1m shown in FIG. (.a), basis weight (g/
When we measured the aperture ratio (%), we found significant differences as shown below. In such a cylindrical or flat triaxial fabric 1, as shown in FIG. 3, weaving threads 3a...3b...
are intertwined in a plain weave form, so that in the direction perpendicular to the core threads, the movement of the core threads 2 moves from P of the first row to the third row of the intersecting ends of the weaving threads of three adjacent rows. Row thing P3...
However, it is not restricted by the second column P2... Therefore, within the range in which each core yarn 2 is regulated by the yarn interlacing portions P...
3a or 3b, 3b spacing can be set freely. the result,
Movement of each weft yarn 2' (corresponding to core yarn 2) corresponding to core yarn 2 occurs at adjacent warp yarn intersections pl,...,P'2...(
Compared to conventional fabrics, which are regulated by the weaving thread intersections PE...pPQ...) in the first and second rows, the second
As shown in the figure, the thread spacing can be made extremely small, and the weaving density can be greatly increased. Conversely, even if the number of threads used remains the same, the weaving density can be reduced by increasing the weaving width (or its diameter in the case of cylindrical fabric) perpendicular to the weaving direction, as shown in FIG. 4, for example. [Effects of the Invention] As can be easily understood from the above explanation, the triaxial fabric of the present invention has core threads parallel to the weaving direction, which correspond to the weft threads in conventional fabrics, so it can be used only in a flat shape. It can be manufactured in any cylindrical shape and has an excellent reinforcing effect in the longitudinal direction, which is the weaving direction. Furthermore, the first and second yarns, which correspond to the warp yarns in conventional textiles, are
Because the weaving threads are intertwined with each other in a plain weave form,
The weaving density can be significantly increased compared to conventional woven fabrics. Moreover, according to the method of the present invention, it is possible to easily produce a darning Sanichi fabric.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the triaxial fabric according to the present invention, where Figure 1 is a perspective view, Figure 2 is a weaving structure diagram of the main part, and Figure 3 is a diagram of the core yarn. FIG. 4 is a weaving structure chart corresponding to FIG. 2 showing a modified example thereof, and FIGS. 5 to 8 are weaving structure charts corresponding to FIG. This is an example of a loom that implements the 5th loom.
The figure is a side view, FIG. 6 is a cross-sectional plan view taken along the vt-vt line in FIG. 5, and FIG. 7 is a cross-sectional plan view showing the state when the impeller is rotated approximately 45 degrees from the state shown in FIG. , FIG. 8 is a diagram of the movement path of the weaving yarn unwinding section, FIG. 9 is a cross-sectional plan view corresponding to FIG. 5 showing a modification of the loom, and FIG. 10 is a movement path diagram of the weaving yarn unwinding section. , Fig. 11 is a cross-sectional plan view of Fig. 5 phase i showing another modification of the loom, Fig. 12 is a movement path diagram of the weaving yarn delivery section, and Fig. 13 shows a conventional triaxial woven fabric. Fig. 14 is a weaving structure diagram of the main part, which corresponds to Fig. 13, excluding the weft threads. 1... Triaxial fabric, 2... Core yarn, 3a... 1st jl
l yarn, 3b...second weaving yarn, 7...core yarn feeding section, 9.
・・Weaving application point, 11a ・・1st yarn feeding part, llb
...Second yarn feeding section. Figure 8 Figure 10 Figure 7 Figure 9

Claims (2)

[Claims] (1) A group of core yarns extending in the weaving direction and a first core yarn that passes sequentially in an oblique manner between adjacent core yarns and intertwines with each other in a plain weave form.
and a second yarn group. (2) A group of core threads let out from a group of core thread let-out parts fixed in parallel and a group of threads let out from a plurality of sets of first and second yarn let-out parts arranged opposite to each other with every other core thread let-out part in between. While advancing the first and second weaving yarn groups to the weaving application point, the first and second weaving yarn feeding sections are sequentially passed between adjacent core yarn feeding sections in mutually opposite directions, thereby weaving. A method for producing a triaxial fabric, characterized in that the first yarn group and the second yarn group are intertwined with each other in a plain weave configuration in which core yarns are sandwiched in the thickness direction of the fabric at a production point.