JPH055242A - Tubular multilayred woven fabric and its production - Google Patents

Abstract

PURPOSE:To obtain tubular multilayered woven fabric having a sufficient strength for stress in the circumferential direction and a method for producing the aforementioned woven fabric. CONSTITUTION:Tubular multilayered woven fabric is obtained by arranging many yarns (1) and (2) in the axial direction extending in the axial direction on the inside and the outside of inserting yarn (3) in the circumferential direction extending in the circumferential direction along its circumference and connecting the yarns (1) and (2) in the axial direction on both sides with interlacing yarn (4) extending in a plane substantially perpendicular to the aforementioned yarns in the axial direction. The inner yarn (1) in the axial direction is interlaced with weft yarns (5) and (6) in the peripheral direction in the circumferential direction picked between the yarns in the axial direction to weave inner fabric (9) and the outer yarns (2) in the axial direction is interlaced with weft yarns (7) and (8) in the peripheral direction in the circumferential direction picked between the yarns (2) to weave outer fabric (10). The inner fabric (9) is preferably connected to the outer fabric (10) with the interlacing yarn (4).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular multi-layered woven fabric, and more particularly, to a three-dimensional multi-layered woven fabric having a tubular cross section and formed by arranging non-woven circumferential insertion yarns in the middle. The present invention relates to a method for manufacturing the woven fabric.

[0002]

2. Description of the Related Art As a three-dimensional multi-layer woven fabric, there is known a structure in which a plurality of rows and a plurality of stages of warp yarns and weft yarns are integrated by weaving bind yarns in a direction orthogonal to the warp yarns and weft yarns (for example, Japanese Patent Publication No. 52-39473). issue). On the other hand, as a cylindrical three-dimensional woven fabric, a single-layered cylindrical woven fabric is known in which circumferential threads (circumferential threads) are woven between the axial threads (axial threads) along the peripheral surface of the mandrel. Is.

[0003]

It is widely practiced to use a cloth-woven material made of glass fibers or carbon fibers as a reinforcing material for synthetic resin or the like. If the molded product is a hollow cylinder (for example, a pipe), wrap glass fiber or carbon fiber woven in a flat cloth into a reinforcing body, or wrap a tape-shaped woven material in a spiral shape. Or a reinforcement
Alternatively, one layer or a plurality of layers of cloth woven in a single layer of a cylindrical shape may be laminated to form a reinforcing body.

However, the first structure has a problem that the strength of the pipe is not constant against the stress in the circumferential direction because the seam of the reinforcing cloth is formed along the axial direction of the molded pipe, and the molding is difficult. Is. Further, the second structure is easier to mold than the first structure, but has a drawback that the strength of the pipe against the axial stress cannot be sufficiently increased because the seam of the cloth is formed in the axial direction.

In the case of the third structure, if the axial thread density and the circumferential thread density are equal, a pipe having substantially the same strength against tensile forces in the axial direction and the circumferential direction is manufactured. As is well known, when an internal pressure or an external pressure acts on a pipe, the stress in the circumferential direction is twice the stress in the axial direction. It is rational to set the density to about half of the density of the circumferential thread. However, when high strength is required, there is a limit to increasing the density of the circumferential yarns because it must intersect the axial yarns, and the circumferential yarns are woven into the axial yarns to form a wavy shape. Therefore, due to the bending deformation of the circumferential thread, the pipe will be distorted in the circumferential direction,
You cannot expect a sufficient reinforcing effect. Therefore, when it is desired to increase the strength in the circumferential direction, the purpose is achieved by winding the filament of the reinforcing fiber in the circumferential direction, but there is a problem that the molding work is troublesome and the productivity becomes low. ..

The present invention has been made for the purpose of solving the above problems, and provides a structure of a tubular multi-layer woven fabric having sufficient strength against a stress in the circumferential direction, and the structure of the structure. An object of the present invention is to provide a weaving method for a tubular fabric.

[0007]

According to the present invention, between the inner axial thread 1 and the outer axial thread 2 which are arranged along the peripheral surface of the cylinder in the axial direction in two or more inner and outer layers. A circumferential insertion yarn (circumferential insertion yarn) 3 extending in a non-woven state is arranged, and the inner and outer axial yarns 1 and 2 are placed on a plane substantially perpendicular to the axial yarns 1 and 2. It is connected by the entangled yarn 4 extending inside. In this case, the inner axial yarn 1 and the outer axial yarn 2 may have a design in which one or both of them is woven by the inner circumferential wefts 5, 6 or the outer circumferential wefts 7, 8. Also, such an inner circumferential weft 5,
6 and the outer circumferential wefts 7 and 8 are not provided, the inner axial yarn 1 and the outer axial yarn 2 are connected in the circumferential direction and the radial direction only by the entangled yarn 4, and the circumferential insert yarn 3 is provided in the middle. The woven fabric 11 can be sandwiched.

In the tubular multi-layer woven fabric 11 having such a structure, the inner axial thread 1 and the outer axial thread 2 are concentrically arranged in the axial direction along the periphery of the mandrel 12 as a core material,
The two axial direction yarns 1 and 2 are divided into two in the axial direction to form four axial direction yarn groups 1R, 1L, 2R, 2L, and the axial direction yarn groups 1R, 2R or 1L, 2L on the same side are not crossed to the outside. By inserting the circumferential insertion yarn 3 by inserting the weft in a state where only the axial thread is opened and opened to the outside, the axial thread groups 1R and 2R or 1L and 2L on the same side are opened and crossed. It can be manufactured by weaving and interlacing the entangled yarn 4. The inner circumferential wefts 5 and 6 and the outer circumferential wefts 7 and 8 woven only into the inner axial yarn 1 and the outer axial yarn 2 intersect the inner and outer axial yarn groups 1R, 1L, 2R and 2L. It is possible to weave it by opening it and wefting it. The circumferential wefts 5 to 8 are alternately performed with the weft inserting operation with the circumferential insert yarn 3 and the entangled yarn 4 which are weft-inserted by the above method.

[0009]

[Function] Cylindrical multi-layer fabric 11 having the above-mentioned structure
Is the circumferential direction by changing the ratio of the circumferential insertion yarn 3 not woven into the axial yarns 1 and 2 and the entangled yarn 4 woven into the axial yarns 1 or 2 or the inner and outer circumferential wefts 5 to 8 The strength with respect to the tensile force of can be freely set.

Since the circumferentially inserted yarn 3 of the intermediate layer is inserted in a straight state without being woven into the axial yarns 1 and 2, the circumference of a pipe using this tubular multilayer fabric as a reinforcing material The directional stress acts on the circumferentially inserted yarn 3 as a simple tensile stress, and can therefore give the pipe sufficient strength against the circumferential stress.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the first structure of the tubular multilayer woven fabric of the present invention.
In the examples, 1 and 2 are axial yarns, 3 is circumferentially inserted yarns, 4 is entangled yarns (bind yarns), and 5, 6, 7 and 8 are circumferential weft yarns. The axial threads 1 and 2 are arranged concentrically inside and outside with the circumferential insertion thread 3 interposed therebetween.
The number of inner axial threads 1 and the number of outer axial threads 2 are the same. The entangled yarn 4 includes an inner axial yarn 1 and an outer axial yarn 2
And the inner axial thread 1 and the outer axial thread 2 are bound together with the circumferential insertion thread 3 sandwiched therebetween.

In the design of the first embodiment, the inner axial threads 1 are woven in a plain weave pattern by the inner circumferential wefts 5 and 6 to form an inner cloth 9, and the outer axial threads 2 are outer circumferentially. Outer cloth 1 woven in a plain weave pattern with direction wefts 7 and 8
It is 0. Therefore, since the inner axial yarn 1 and the outer axial yarn 2 which are adjacent to each other are constrained by the circumferential wefts 5, 6 or 7, 8, one entangled yarn 4 is provided for each of the inner and outer axial yarns 1, 2. It is also possible to have a structure in which every two or two lines are crossed. FIG. 2 is a diagram showing a structure formed when every other entangled yarn 4 is laid over. The circumferential insertion yarn 3, the entangled yarn 4, and the circumferential wefts 5, 6, 7 and 8 are inserted or woven between the axial yarns 1 and 2 by so-called weft insertion.

FIGS. 3 and 4 schematically show an example of an apparatus for weaving the tubular multi-layer woven fabric of the present invention. The tubular multi-layer woven fabric 11 controls the inner diameter of the mandrel 12.
And the guide ring 13 that regulates the outer diameter thereof. 14L and 14R are bobbins for inner axial threads, and 15R and 15L are bobbins for outer axial threads.
The inner axial thread 1 and the outer axial thread 2 are each divided into two parts on the left and right along the diametrical line of the cylinder, and the inner axial thread groups 1R and 1L and the outer axial thread group 2 that are divided into the left and right parts thereof.
The opening devices 16 to 19 are provided in each of R and 2L. Therefore, four sets of opening devices each including two healds are provided, and the healds indicated by 16a and 16b in the drawing are the opening devices for the inner axial thread group 1R on the right side of the drawing, 17a and 17a.
The heddle indicated by b is the opening device for the inner axial yarn group 1L on the left side of the figure, the heald indicated by 18a, 18b is the opening device for the outer axial yarn group 2R on the right side of the figure, and the heald indicated by 19a, 19b is the figure. Is an opening device for the outer axial thread group 2L shown on the left side of FIG.

These healds are driven in the left-right direction in FIG. 3, and the inner axial thread group 1R, 1 and the outer axial thread group 2R,
The 2L is opened individually or so as to intersect the two or separate the two. Figure 3
The state shown in (1) shows a state in which the outer axial thread groups 2R and 2L are individually opened. As shown in FIG. 4, the axial thread groups 1R, 1L, 2R, 2L in the opening portion are
Linear openings 20R and 20L for weft insertion that are arranged in a straight line in a state of being expanded from the diameter of the tubular woven fabric to be woven
Are formed.

Reference numeral 21 denotes a hook, which moves in the vertical direction in FIG. 3 and strikes the weft-inserted yarn in the shuttle 27 below into the cloth fell so that the circumferentially inserted yarn 3, the entangled yarn 4, and the circumferential wefts 5 to 8 are formed. To do. As shown in FIG. 4, the lure 23 of this lure is oriented in the radial direction of the tubular woven fabric 11 to be woven at the center, and is bent so that the outside is parallel. The ends of the respective feathers on the center side are fixed to a ring 26 which moves up and down together with the feathers 23. Since the tail 23 has such a shape, when the tail 21 is moved upward, the axial thread groups 1R, 1L, 2R, 2L are opened by the opening devices 16 to 19.
In cooperation with the guide, the yarns 31 to 34 inserted by the mandrel 12 and the guide ring 13 are driven toward the cloth fell constrained in a circular shape at the time of beating. ..

The weft insertion is performed using a shuttle 27. The shuttle 27 draws a rectangular locus as shown by the alternate long and short dash line in FIG. That is, in the loom shown in FIG. 4, metal plates (not shown) are attached to the upper and lower surfaces of the shuttle 27 that accommodates the bobbin of the thread to be inserted into the corresponding opening. On the other hand, a frame 36 having a U-shape and capable of reciprocating in a direction indicated by a double-headed arrow 41 in FIG. 4 is provided, and a rapier 35 is slidably attached to the frame 36. Further, an electromagnetic magnet 39 is provided at the tip of the rapier 35, and the electromagnetic magnet 3
7 and 38 are provided below the both ends of the frame 36, respectively.

When the rapier 35 first advances and its tip enters the lower side of the shuttle 27, the electromagnetic magnet 39 is energized and the electromagnetic magnet 39 is fixed to the lower side of the shuttle 27, whereby the shuttle 27 is attached to the rapier 35. It will be kept at the tip. In this state, the rapier 35 is driven to move the shuttle 27 from the lower side to the upper side in FIG. 4, and accordingly, the yarn in the shuttle 27 is pulled out and placed in the opening 20R. The position of the frame 36 at this point is the position shown by the solid line in FIG. 4, and the shuttle 27 advances to a position below the electromagnetic magnet 37 at one end of the frame 36. Next, the electromagnetic magnet 39 of the rapier 35 is de-energized, and the electromagnetic magnet 37 of the frame 36 is also removed.
To the rapier 35.
To the frame 36. Then, the rapier 35 having released the shuttle 27 is pulled back to the original position, and the frame 36 can be moved from the position shown by the solid line to the position shown by the broken line. The shuttle 27 also moves to the left as the frame 36 moves, and the rapier 35 also moves to the position indicated by 35a. The yarn is fed in the lateral direction by the movement of the shuttle 27. Rapier 3 again at this position
5 is moved to the lower side of the shuttle 27 held by the electromagnetic magnet 37 of the moved frame 36, and from now onward, the shuttle 27 is transferred from the frame 36 to the tip of the rapier 35. Next, the rapier 35 is returned to the original position and the yarn is supplied to the opening 20L. Finally, the shuttle 27 is again moved from the rapier 35 to the other end of the frame 36 (electromagnetic magnet 38
, The shuttle 27 is returned to its original position by moving the frame 36 from the position indicated by the broken line to the position indicated by the solid line. In this way the threads to be inserted into the openings can be arranged in a rectangular shape. By adopting the above-described yarn insertion method (weft striking method) for each of the circumferential insertion yarn 3, the entangled yarn 4, and the circumferential wefts 5 to 8, a tubular multi-layer woven fabric having a predetermined design can be manufactured.

As described above, the yarn is arranged in the opening in a substantially rectangular locus, and there arises a problem that the yarn length is longer than the length of the yarn to be arranged on the cloth fell. To solve this problem, a yarn length compensating device using a spring or the like may be provided. Further, the movements of the opening devices 16 to 19, the shuttle 27, the rapier 35, and the frame 36 may be sequentially controlled using a controller (not shown).

When the yarn is inserted into the opening using the above-mentioned structure, as shown in FIG. 5, the inner axial thread groups 1R and 1L and the outer axial thread groups 2R and 2L are inserted in a state of being opened in a direction separating from each other. When the yarn 31 is driven into the cloth fell 22, the yarn 31 becomes the circumferential insertion yarn 3, and as shown in FIG. 6, the inner axial yarn groups 1R and 1L and the outer axial yarn groups 2R and 2L.
Thread 32 inserted in a state of being opened in a direction intersecting with
Becomes the entangled yarn 4 when it is driven into the cloth 22 and retracts the outer axial yarn groups 2R and 2L as shown in FIG.
The thread 33 inserted into the opening with the inner axial thread groups 1R and 1L opened is the inner circumferential weft threads 5 and 6 when driven into the cloth fell 22, and as shown in FIG. 1R, 1L are retracted, and outer axial thread groups 2R, 2
The thread 34, which is inserted with the Ls open, is driven into the cloth fell 22 and becomes the outer circumferential wefts 7 and 8.

The tubular multi-layer woven fabric 11 of the present invention woven in this way has the circumferential insertion yarn 3, the entanglement yarn 4 and the inner and outer circumferential wefts 5 to 8 of the design shown in FIG. 1 or 2. Are all formed from the same thread. However, how to choose the proportion of the number of weft insertions of these yarns can be arbitrarily selected by controlling the operation of the shedding devices 16 to 19, and the axis required for the woven tubular fabric is It may be determined in consideration of the strength in the direction, the strength in the circumferential direction, and the strength against local stress. Of course, it is also possible to change the types and thicknesses of the circumferentially inserted yarn and the entangled yarn or the circumferential weft by using a plurality of shuttles 27.

FIG. 9 shows the third structure of the tubular multi-layer woven fabric of the present invention.
An example is shown, and the circumferential weft 5 shown in FIGS. 1 and 2 is used.
The structure does not have 8 to 8. In this structure, the inner axial threads 1 and the outer axial threads 2 are arranged in a staggered manner, and the entangled threads 4
Every other one, which extends radially and binds the inner axial thread 1 and the outer axial thread 2 together, and a portion 4b which extends obliquely in the circumferential direction and bears the stress in the circumferential direction. And are formed so that the entangled yarn 4 has the functions of the circumferential wefts 5 to 8 shown in FIGS.

The woven fabric having this structure is woven by weft insertion of the circumferential cord yarn shown in FIG. 5 and weft insertion of the entangled yarn 4 shown in FIG. The difference between the weft-inserted state of the entangled yarn of FIG. 10 and the weft-inserted state of the entangled yarn of the first embodiment shown in FIG.
When weaving the structure of the third embodiment, the inner axial thread groups 1R and 1L and the outer axial thread 2 are inserted when weaving the interlaced threads 4.
It is the point where R and 2L are opened so as to intersect with each other. The open state shown in FIG. 10 is as shown in FIG.
It also occurs when weft insertion of the entangled yarn 4 in the above-mentioned structure.

The structure of the third embodiment shown in FIG. 9 is a structure in which the stress in the circumferential direction acting on the tubular woven fabric is borne by almost all the circumferential insertion yarns 3, and the woven tubular multi-layer woven fabric is used. It can be used when a relatively simple internal pressure or external pressure acts on a composite pipe used as a reinforcing material.

[0024]

According to the tubular multi-layer woven fabric of the present invention described above, it is possible to impart sufficient strength in the circumferential direction and the axial direction to a tubular composite material formed by using this woven fabric as a reinforcing material. Further, it is possible to weave a reinforced woven fabric having strengths against the respective stresses according to the circumferential direction, the axial direction, and the ratio of the local stress. Further, since the circumferentially inserted yarn is present in a straight line without being woven into the axial yarn, it is possible to obtain a tubular reinforcing fabric that can withstand a high internal pressure with a thin wall thickness and that can be easily molded during composite molding. The effect is that it will be possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing the structure of a first embodiment of a tubular multilayer fabric of the present invention.

FIG. 2 is a partial cross-sectional view showing the structure of a second embodiment of the tubular multilayer fabric of the present invention.

FIG. 3 is a side view schematically showing an example of an apparatus for weaving the tubular multilayer fabric of the present invention.

FIG. 4 is a plan view schematically showing the structure of the lure, the opening state of the axial thread, and the movement means of the shuttle used in the device shown in FIG.

5 is a side view schematically showing the weft-inserted state of the circumferentially inserted yarn in the weave design shown in FIG.

FIG. 6 is a side view similar to FIG. 5, schematically showing the weft-inserted state of the entangled yarn.

FIG. 7 is a side view similar to FIG. 5, which schematically shows the weft insertion state of the inner circumferential weft.

FIG. 8 is a side view similar to FIG. 5, schematically showing the weft insertion state of the outer circumferential weft.

FIG. 9 is a partial cross-sectional view showing the structure of a third embodiment of the tubular multilayer fabric of the present invention.

FIG. 10 is a side view schematically showing the weft-inserted state of the entangled yarn in the weave design shown in FIG.

[Explanation of symbols]

 1 ... Inner axial thread 1R, 2R ... Right axial thread group 2 ... Outer axial thread 1L, 2L ... Left axial thread group 3 ... Circular insertion thread 4 ... Entangling thread 5-8 ... Circular weft thread 9 ... Inner cloth 10 ... Outer cloth 11 ... Cylindrical multilayer fabric 12 ... Mandrel 27 ... Shuttle

Claims (1)

Claims: 1. Circumferentially inserted yarn (3) extending in the circumferential direction.
A large number of axial yarns (1), (2) extending axially inward and outward of the yarn are arranged along the circumference of the yarn, and the entangled yarns extending in a plane substantially perpendicular to the axial yarns ( 4) A tubular multi-layer woven fabric in which axial yarns (1) and (2) on both sides are connected at 4). 2. A circumferential insertion yarn (3) extending in the circumferential direction.
A large number of axial threads (1), (2) extending inward and outward in the axial direction are arranged along the circumference thereof, and the inner axial thread (1) is weft-inserted in the circumference thereof. Circumferential wefts (7), in which the inner cloth (9) is woven by weaving in the direction circumferential wefts (5), (6) and the outer axial threads (2) are weft-inserted between them. (8) weaving an outer cloth (10) and connecting both cloths (9), (10) with an interlacing thread (4) extending in a plane substantially perpendicular to the axial thread.
Cylindrical multilayer fabric. 3. An inner axial thread (1) and an outer axial thread (2) are concentrically arranged along the circumference of a cylindrical core material (12), and the inner axial thread (1) and the outer side are arranged. A circumferential insertion yarn (3) is inserted by opening in a direction that does not intersect the axial yarn (2), and a part or all of the inner axial yarn (1) and the outer axial yarn (2) cross each other. Entangled yarn (4) opened in the direction
A method for producing a tubular multi-layer woven fabric, which comprises wefting. 4. The weft inserting step is performed using a shuttle, the shuttle is moved from an initial position along a first straight line, the shuttle is traversed in a direction perpendicular to the first straight line, and then the shuttle is moved to the first straight line. The manufacturing method according to claim 1, wherein the step of traversing the shuttle in the direction perpendicular to the second straight line and returning to the initial position after repeating the movement in the opposite direction along the second straight line parallel to the first straight line is repeated.