JP2003105663A - Oriented glass fiber mat and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass fiber mat tending to elongate unidirectionally in a condition of being impregnated with a resin and having unidirectional physical properties including mechanical strength and others when the resin is cured, and to provide a method for producing the glass fiber mat. SOLUTION: This mat has the following structure: 60 wt.% or greater of glass fibers 1 accumulated in layers are oriented unidirectionally, the accumulated glass fibers 1 are sewn with yarns 2 in the direction rectangular to the oriented direction of the glass fibers 1, bound with a solvent-soluble binder, or entangled with glass fibers raised by needle punching. The other objective method for producing this mat comprises unidirectionally orienting most of the glass fibers by a specific glass fiber orientation device and accumulating them, and then sewing them, impregnating them with the binder, or subjecting them to needle punching.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oriented glass fiber mat in which 60% or more of glass fibers are oriented in one direction, and a method for producing the same.

[0002]

2. Description of the Related Art When lining the inner surface of a sewer pipe or the like, a tube in which a glass fiber mat is impregnated with a curable resin is often used. The glass fiber mat used for this tube needs to be easily stretched in the circumferential direction of the tube when lining, and if a glass fiber mat that is hard to stretch in the circumferential direction is used, the tube will be pneumatically or hydraulically pressured during lining. There is a disadvantage that it will be difficult to make close contact with. Then, when the impregnated resin is cured after the lining, it is required to be a glass fiber mat capable of imparting high strength in the circumferential direction.

Similarly, in other applications, there is a case where a glass fiber mat which is easily impregnated with a resin and which easily expands in one direction and has good strength and other physical properties in one direction when the impregnated resin is cured. Conceivable.

[0004]

However, at present, it is easy to stretch in one direction in the state of being impregnated with resin,
A glass fiber mat which has good strength and other physical properties in one direction when the impregnated resin is cured and which can be used satisfactorily is in an undeveloped state and cannot be found by searching the market.

The present invention has been made in view of the above circumstances, and provides an oriented glass fiber mat which easily expands in one direction when impregnated with a resin and has good physical properties in one direction when the impregnated resin is cured. The purpose is to provide a method of manufacturing the same.

[0006]

In order to achieve the above object, an oriented glass fiber mat according to claim 1 of the present invention comprises:
It is characterized in that 60% or more of the glass fibers stacked in layers are oriented in one direction, and the stacked glass fibers are sewn with threads in a direction orthogonal to the orientation direction of the glass fibers.

In such an oriented glass fiber mat, since the stacked glass fibers are sewn with threads, the glass fibers do not separate into pieces and become a sheet-like mat such as quilting, which is easy to handle. . Moreover,
This mat has more than 60% of the glass fibers oriented in one direction,
Since the sewing direction by the thread is orthogonal to the orientation direction of the glass fiber, if a tensile force is applied to the orientation direction of the glass fiber with or without resin impregnation, the glass fiber will be displaced in the orientation direction. When the impregnated resin is hardened, the mechanical strength in the orientation direction (for example, tensile strength, bending strength, bending elastic modulus, etc.) is significantly improved.

Next, in the oriented glass fiber mat according to claim 2 of the present invention, 60% or more of the glass fibers stacked in layers are oriented in one direction, and the stacked glass fibers are soluble in a solvent. It is characterized by being bound by a binder.

In such an oriented glass fiber mat, since the stacked glass fibers are bound by the binder, the glass fibers do not separate into pieces and are easy to handle. Moreover, 60% or more of the glass fibers are oriented in one direction, and when impregnated with the resin, the binder dissolves in the solvent and separates the glass fibers from each other. Therefore, when a tensile force is applied in the orientation direction of the glass fibers, When the fibers are misaligned in the orientation direction and easily stretched, and when the impregnated resin hardens,
The mechanical strength in the orientation direction is significantly improved.

Next, in the oriented glass fiber mat according to claim 3 of the present invention, 60% or more of the glass fibers stacked in layers are oriented in one direction, and the stacked glass fibers are erected by needle punching. It is characterized by being intertwined with glass fibers.

In such an oriented glass fiber mat, since the stacked glass fibers are entangled with the glass fibers erected by needle punching, the glass fibers do not separate into pieces and are easy to handle. Moreover, since 60% or more of the glass fibers are oriented in one direction, when tensile force is applied in the orientation direction of the glass fibers in the resin-impregnated state or the resin-impregnated state, the glass fibers are displaced in the orientation direction. When it is generated and easily stretched, and when the impregnated resin is cured, the mechanical strength in the orientation direction is significantly improved.

Next, the oriented glass fiber mat according to claim 4 of the present invention is the oriented glass fiber mat according to any one of claims 1 to 3, wherein the orientation direction of the glass fiber is inside the mat or on the surface layer of the mat. The present invention is characterized in that a large number of reinforcing threads are arranged in a direction orthogonal to the above.

In such an oriented glass fiber mat, the reinforcing strength can also improve the tensile strength in the direction orthogonal to the orientation direction of the glass fibers.

Next, in the method for producing an oriented glass fiber mat according to a fifth aspect of the present invention, a plurality of elongated orienting members having a triangular mountain cross-sectional shape are provided above the belt conveyor at right angles to the traveling direction of the belt conveyor. Then, they are installed in parallel with each other with a gap between them, while vibrating each orientation member simultaneously.
Supplying the glass fiber on the orientation member, dropping the glass fiber from the mutual gap of the orientation member to the belt conveyor,
It is characterized by having a glass fiber orientation and stacking step.

According to this manufacturing method, in the glass fiber orientation and stacking process, most of the glass fibers are oriented by the orientation member in a direction orthogonal to the direction of travel of the belt conveyor, and fall onto the belt conveyor through the gaps between the orientation members. Therefore, 60% or more of the glass fibers stacked in layers on the belt conveyor are oriented in one direction (direction orthogonal to the traveling direction of the belt conveyor). Since the orienting member is vibrated, the glass fibers do not slide down the slopes on both sides of the orienting member efficiently and do not collect on the orienting member. Therefore, the oriented glass fiber mat of the present invention in which 60% or more of the glass fibers are oriented in one direction can be easily and reliably manufactured.

Next, in the method for producing an oriented glass fiber mat according to a sixth aspect of the present invention, a plurality of orienting rollers are provided above the belt conveyor so as to be orthogonal to the traveling direction of the belt conveyor and to have gaps in parallel with each other. Glass fibers were placed side by side while rotating the orienting rollers at the same time so that every other rotating direction of the orienting rollers was in the opposite direction, and the orienting rollers at both ends were inward. The present invention is characterized by comprising the steps of orienting and stacking glass fibers, which are supplied onto the orienting rollers and drop the glass fibers onto a belt conveyor through the gaps between the orienting rollers.

According to this manufacturing method, in the glass fiber orientation and stacking process, the glass fibers pass through the gap between the orientation rollers in which the glass fibers are alternately inverted, and most of them are oriented in the direction orthogonal to the traveling direction of the belt conveyor, Since it falls on the conveyor, 60% or more of the glass fibers stacked in layers on the belt conveyor are oriented in one direction (direction orthogonal to the traveling direction of the belt conveyor). And, since the orientation roller is rotating, the glass fiber does not collect on the orientation roller, and because the rotation direction of the orientation rollers at both ends is inward, the glass fiber does not spill on both sides. . Therefore, the oriented glass fiber mat of the present invention in which 60% or more of the glass fibers are oriented in one direction can be easily and reliably manufactured.

Next, in the manufacturing method according to claim 7 of the present invention, the glass fibers stacked in the above-mentioned glass fiber orientation and stacking step are threaded in a direction orthogonal to the glass fiber orientation direction in the next step. It is characterized by sewing with.

By sewing as in this manufacturing method, it is possible to obtain a sheet-like mat which is easy to handle, such as quilting, in which the glass fibers do not separate into pieces.

Next, the manufacturing method according to claim 8 of the present invention is characterized in that the glass fibers stacked in the above glass fiber orientation and stacking step are impregnated with a binder dissolved in a solvent in the next step. It is what

When the binder is impregnated as in this manufacturing method, a mat that is easy to handle can be obtained in which the glass fibers are bound by the binder and do not separate into pieces.

Next, in the manufacturing method according to claim 9 of the present invention, the glass fibers stacked in the above-mentioned glass fiber orientation and stacking step are treated with a needle punch in the next step, thereby partially removing It is characterized by erecting glass fibers.

When a part of the glass fibers is erected by needle punching as in this manufacturing method, the erected glass fibers are entangled with other glass fibers to obtain a mat which is easy to handle and does not separate into pieces. You can

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of an oriented glass fiber mat according to an embodiment of the present invention.

In this oriented glass fiber mat M, 60% or more, preferably 70% or more of the glass fibers 1 stacked in layers are oriented in one direction, and the stacked glass fibers 1 are separated into pieces. The thread 2 is sewn in a direction orthogonal to the orientation direction of the glass fiber 1 so as not to do so.

As the glass fiber 1, at least 10 m
A glass fiber (chopped strand) having a length of m or more, preferably about 30 to 100 mm is used.
Glass fibers having a length shorter than 10 mm are unsuitable because they have poor orientation. Although the thickness of the glass fiber 1 is not particularly limited, a glass fiber having a fiber diameter of about 10 to 30 μm is preferably used in consideration of handleability and strength.

The thickness of the oriented glass fiber mat M (in other words, the amount of glass fibers stacked) varies depending on the use, but it is generally preferable to stack the mats M to a thickness of about 200 to 1200 g / m ² . If it is thinner than this, it becomes difficult to form or sew a mat, and if it is thicker than this, the handling property is deteriorated. When a thicker oriented glass fiber mat is required, the above mat M may be stacked and used.

As the sewing thread 2, a synthetic resin thread having a high strength such as polyester or nylon is preferably adopted.

In such an oriented glass fiber mat M, 60% or more, preferably 70% or more of the glass fibers 1 are oriented, so that when a tensile force is applied in the orientation direction of the glass fibers 1, the glass fibers 1 will be formed. The glass fiber 1 does not separate into pieces because it is misaligned in the orientation direction and easily stretches, and because it is sewn with the synthetic resin thread 2 in a direction orthogonal to the orientation direction to form a sheet-like mat like quilting. It is easy to handle, and since the sewing direction is orthogonal to the orientation direction of the glass fibers 1, the yarn 2 does not hinder the elongation of the mat M (elongation in the orientation direction of the glass fibers).

Therefore, for example, when a lining tube is manufactured using the above-mentioned oriented glass fiber mat M and the inner surface of a sewer pipe or the like is lined by impregnating an uncured synthetic resin, the tube is circumferentially moved by air pressure or water pressure. It is possible to form an inner surface lining layer that stretches and adheres to the inner surface of the pipe, and has a large circumferential strength (pressure resistance, etc.) as the resin hardens.

FIG. 2 is a sectional view of an oriented glass fiber mat according to another embodiment of the present invention.

In this oriented glass fiber mat M, a large number of reinforcing yarns 3 in a direction orthogonal to the orientation direction of the glass fibers 1 are arranged in parallel inside the oriented glass fiber mat shown in FIG. It is a thing.

The reinforcing yarn 3 is for imparting a large tensile strength in the direction orthogonal to the orientation direction of the glass fiber 1, and glass roving or the like having a thickness of, for example, 600 to 2400 tex is preferably used. . Glass rovings thinner than 600 tex have insufficient tensile strength, and glass rovings thicker than 2400 tex have too high rigidity. The mutual spacing of the reinforcing threads 3 may be appropriately determined so as to obtain the required tensile strength, but when used in the lining tube as described above, it is preferable to arrange the reinforcing threads 3 at intervals of about 7 to 12 mm.

The reinforcing yarn 3 may be arranged in the middle portion of the mat M as shown in FIG. 2, or may be arranged in the surface layer portion of the mat M. In the case of arranging it in the middle portion, two mats having a thickness of half are stacked and the reinforcing yarn 3 is sandwiched between them. In the case of arranging it in the surface layer portion, the reinforcing yarn 3 is simply placed on the mat M. It may be mounted and sewn together with the glass fiber 1 with the thread 2.

In such an oriented glass fiber mat M, the glass fibers 1 are not separated into pieces by sewing, and the tensile strength in the direction orthogonal to the orientation direction of the glass fibers is greatly increased by the reinforcing yarn 3 such as glass roving. Can be improved. Therefore, if a lining tube is manufactured using this mat M, it is possible to eliminate the fear that the tube will be broken due to a large tension when the tube is drawn into a sewer pipe or the like.

In each of the above oriented glass fiber mats M, the glass fibers 1 are sewn with the threads 2 so that the glass fibers 1 are not separated from each other. However, the oriented glass fiber mat of the present invention is manufactured by a means other than sewing. 1 may be configured so as not to be separated.

One of them is that the glass fibers are stacked in layers and 60% or more (preferably 70% or more) of which are oriented in one direction are combined with a binder soluble in a solvent to separate the glass fibers. It is an oriented glass fiber mat that does not separate into.

The other is to entangle glass fibers stacked in layers and 60% or more (preferably 70% or more) oriented in one direction with glass fibers erected by needle punching. It is an oriented glass fiber mat in which the glass fibers are not separated into pieces.

Since the former oriented glass fiber mat binds the glass fibers with the binder, it hardly grows in the orientation direction of the glass fibers as it is, but when the resin dissolved in the solvent is impregnated, the binder dissolves in the solvent. The glass fibers are separated from each other, and when a tensile force is applied to the glass fiber in the orientation direction, the glass fibers are displaced in the orientation direction and easily expand. Dynamic strength is greatly improved. As the binder for binding the glass fibers, a resin binder such as a polyester resin soluble in a solvent such as a styrene monomer is preferably used.

On the other hand, in the latter oriented glass fiber mat, the stacked glass fibers are only entangled with the glass fibers erected by needle punching, so that the glass fibers may or may not be impregnated with resin. When a tensile force is applied in the orientation direction, the glass fiber is apt to be displaced in the orientation direction and easily stretches, and when the impregnated resin is cured, the mechanical strength in the orientation direction is significantly improved. The ratio of the glass fibers to be erected by the needle punch can be adjusted by the number of needles per unit area (1 square meter), the depth at which the needles are pierced, the shape of the needles, etc. It is important to adjust so that the orientation of the fibers does not deteriorate.

Next, the method for producing the oriented glass fiber mat of the present invention will be described with reference to the drawings.

FIG. 3 is a plan view of a glass fiber orientation device used in a manufacturing method according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of the device, and FIG. 5 is an explanatory view of an orientation member of the device. FIG. 6 is an explanatory view of the vibration applying means in the device.

In the manufacturing method of this embodiment, in the glass fiber orientation and stacking step, a plurality of elongated orientation members 5a each having a triangular chevron cross-section are arranged above the belt conveyor 4 at right angles to the traveling direction of the belt conveyor 4. Glass fiber orienting devices 5 arranged in parallel with each other with a gap 5j between them, and while vibrating each orienting member 5a at the same time, glass fibers are supplied onto the orienting member 5a so that the orienting members 5a are mutually reciprocated. Glass fibers are dropped onto the belt conveyor 4 through the gap 5j and stacked in layers.

Explaining in a little more detail, the glass fiber orientation device 5 used in this manufacturing method has a plurality of (six) elongated orientation members 5a having a triangular chevron cross-sectional shape as shown in FIGS. 4 are arranged parallel to each other at right angles to the traveling direction of 4 with a gap 5j therebetween, and are integrally held by holding plates 5b, 5b on both sides. The plurality of orientation members 5a held by the holding plates 5b, 5b are arranged inside the rectangular base frame 5c, and the coil springs 5d at the four corners are arranged.
Is attached to the base frame 5c so that it can vibrate along the traveling direction of the belt conveyor 4.

A horizontal member 5e is bridged over the ends of the holding plates 5b, 5b, and an intermediate portion of the horizontal member 5e is
An arm 5g whose tip 5f is bent upward is fixed. The base frame 5c is a motor 5 incorporating a reduction gear.
h is placed, and a plurality of (2
The blades 5i of (sheet) are adapted to be hooked on the tip portion 5f of the arm 5g. Further, height-adjustable casters 5k are attached to the four corners of the base frame 5c. By placing the casters 5k on both sides of the belt conveyor 4, the glass fiber orientation device 5 can be installed in the belt conveyor 4.
It is installed so that its height can be adjusted and it can be moved across.

In the glass fiber orientation device 5 as described above, when the motor 5h is driven, the blade 5i at the tip of the output shaft is caught by the tip 5f of the arm 5g and rotated as shown by the alternate long and short dash line in FIG. Moves in one direction (left in FIG. 6) against the force of the coil spring 5d, so that the orientation member 5a held by the holding plates 5b, 5b moves in the direction opposite to the traveling direction of the belt conveyor 4. . And
When the blade 5i is disengaged from the tip 5f as shown by the solid line, the arm 5g is moved by the restoring force of the coil spring 5d.
The orienting member 5a moves in the opposite direction (the traveling direction of the belt conveyor 4). Therefore, the arm 5g and the orientation member member 5a are adapted to repeat vibration along the traveling direction of the belt conveyor 4 by the rotation of the blade 5i.

As described above, when the orienting member 5a of the glass fiber orienting device 5 is vibrated and the above-mentioned glass fiber is supplied thereon, the glass fiber slides down the slopes on both sides of the orienting member 5a, and the glass conveyor moves. Since it is oriented in the direction orthogonal to the traveling direction and drops onto the belt conveyor through the gap 5j between the orientation members 5a, 60% or more of the glass fibers are oriented in one direction (the direction orthogonal to the traveling direction of the belt conveyor 4). Can be stacked.

In this case, if there is no vibration applied to the orientation member 5a, there is a possibility that the glass fibers will accumulate on the orientation member 5a, but in this manufacturing method, the orientation member 5a is vibrated as described above. Therefore, the glass fiber is oriented member 5
There is no danger of accumulating on the surface a, and it slides down the slopes on both sides of the orientation member 5a and efficiently falls onto the belt conveyor 4.

The orienting member 5a has a triangular mountain-shaped cross section as shown in FIG. 5, and its apex angle θ is 50 °.
It is preferably about 70 ° and the slopes on both sides are smoothed. If the apex angle θ is greater than 70 °,
Since the slopes on both sides become too loose, slipping of the glass fibers may decrease, and the glass fibers may easily accumulate on the orientation member 5a. On the contrary, when the slopes are less than 50 °, the slopes on both sides may decrease. Since it is too tight, the glass fibers may fall onto the bell and the conveyor 4 before being sufficiently oriented, and the orientation may be deteriorated. The most desirable orienting member 5a is an orienting member having an apex angle θ of 60 ° and a width t of both side slopes of about 50 mm.

Further, the mutual clearance 5j of the orienting members 5a is
When the fiber length of glass fiber is 50 mm, it is 5 to 15 m.
It is preferable to set it to about m, and when it is less than 5 mm, the glass fibers are likely to be clogged, and when it is more than 15 mm, the orientation of the glass fibers is deteriorated. The most preferable gap is about 10 mm.

In the next step, the glass fibers stacked in layers while being oriented as described above in the glass fiber orientation and stacking step are sewn with a thread in a direction orthogonal to the glass fiber orientation direction, or , A binder dissolved in a solvent is impregnated, or a part of the glass fiber is erected by treatment with a needle punch. When sewn, a sheet-like oriented glass fiber mat M shown in FIG. 1 such as quilting in which glass fibers do not separate into pieces is obtained,
When impregnated with a binder, a mat is formed in which the glass fibers are bound by the binder and do not separate into pieces, and when treated with a needle punch, the matting glass fibers do not separate into separate pieces due to entangled glass fibers with other glass fibers. Is obtained.

When tensile strength is required, reinforcing yarns such as glass roving in a direction orthogonal to the orientation direction of the glass fibers are spaced from each other on the surface layer portion or inside of the glass fibers stacked in layers. After they are arranged in parallel, sewing or the like is performed to obtain the oriented glass fiber mat M containing the reinforcing thread 3 as shown in FIG.

FIG. 7 is a plan view of a glass fiber orientation device used in a manufacturing method according to another embodiment of the present invention, FIG. 8 is a front view of the device, and FIG. 9 is a sectional view of the device.

In the manufacturing method of this embodiment, in the glass fiber orientation and stacking process, a plurality of orientation rollers 6a are formed above the belt conveyor 4 so as to be orthogonal to the traveling direction of the belt conveyor 4 and to form gaps 6b parallel to each other. Glass fiber aligning device 6 installed in parallel, and each aligning roller 6a
While rotating, the glass fibers are supplied onto the orientation roller 6a, and the glass fibers are dropped from the mutual gap 6b of the orientation rollers 6a onto the belt conveyor 4 and stacked in layers.

More specifically, the orienting rollers 6a of the glass fiber orienting device 6 are arranged in a plurality at a distance from each other so as to be orthogonal to the traveling direction of the belt conveyor 4 and to have a gap 6a in parallel with each other.
(6 pieces) are arranged and are rotatably supported by bearings of the support plates 6c, 6c on both sides. A gear 6d is provided on the roller shaft at one end of each orientation roller 6a, and the gears 6d of each orientation roller 6a mesh with each other. Therefore, when any one of the orientation rollers 6a is rotated, as shown in FIG. 9, every other orientation roller 6a rotates in the opposite direction. In that case, the glass fibers supplied onto the orienting rollers 6a are reversely rotated by alternately rotating each of the orienting rollers 6a so that the rotating directions of the rollers 6a and 6a at both ends are inward. It is necessary to prevent the orientation rollers 6a, 6a from spilling outward.

Support plates 6c, 6c on both sides of the orientation roller 6a
U-shaped base frames 6e are fixed to both ends of the base frame 6e.
A motor 6f incorporating a reduction gear is installed in the side frame portion of e. Then, as shown in FIG. 9, the chain 6h is wound around the sprocket 6g at the tip of the output shaft of the motor 6f and one gear 6d of the orientation roller 6a, and when the motor 6f is driven, the orientation roller 6a becomes one. Rotate in the opposite direction every other time, and aligning rollers 6 at both ends
Each of a and 6a is adapted to rotate inward. Further, height-adjustable casters 6i are attached to the four corners of the base frame 6e, and by placing the casters 6i on both sides of the belt conveyor 4, the glass fiber orientation device 6 crosses the belt conveyor 4 and moves high. Adjustable and movable.

Such a glass fiber orientation device 6 is installed above the belt conveyor 4, and every other orientation roller 6a is reversely rotated by a motor 6f and the orientation rollers 6a, 6a at both ends are rotated inward. When the above-mentioned glass fibers are supplied onto the orienting roller 6a, the glass fibers pass through the gaps 6b between the orienting rollers 6a and 6a in which the glass fibers are alternately inverted, and are oriented in the direction orthogonal to the traveling direction of the belt conveyor 4. Since it falls on the belt conveyor 4,
60% or more of the glass fibers are stacked in one direction (direction orthogonal to the traveling direction of the belt conveyor 4). Moreover, since the orienting roller 6a is rotating, the glass fibers do not collect on the orienting roller 6a, and since the orientation rollers 6a, 6a at both ends rotate in the inward direction, the glass fiber can be moved to both sides. It will not spill.

The thickness of the orientation roller 6a is not particularly limited, but when orienting glass fibers having a fiber length of about 50 mm, a roller having a diameter of about 50 mm is suitable, and an orientation roller that is too thick or an orientation roller that is too thin is used. Has a poorly oriented glass fiber. Further, the mutual spacing 6b between the orienting rollers is preferably set to about 5 to 15 mm, and when the distance is less than 5 mm, the glass fibers are likely to be caught, and when it is greater than 15 mm, the orientation of the glass fibers deteriorates. The most preferable gap is about 10 mm.

The glass fiber orienting device used in this manufacturing method rotates each orienting roller 6a through the chain 6h and the gear 6d. However, a power transmission belt other than the chain or a rubber wheel which is hard to slip is used. You may make it rotate via.

In the next step, the glass fibers stacked in layers while being oriented in one direction by the above-mentioned orienting device are also sewn with a thread in a direction orthogonal to the orientation direction of the glass fibers or dissolved in a solvent. By impregnating with a binder or by processing with a needle punch to erect some of the glass fibers, an oriented glass fiber mat in which the glass fibers do not separate into pieces is obtained.

Next, the physical property test conducted on the oriented glass fiber mat of the present invention will be described.

[Physical Property Test] Glass fibers (fiber length: 50 mm, mutual distance between the orientation rollers: 10 mm) shown in FIGS.
(About 50 mm, fiber diameter: about 2400 tex) is supplied onto the orienting roller, and glass fibers are dropped onto the belt conveyor 4 through the gap 6b between the orienting rollers.
Most of the glass fibers were stacked in layers while being oriented in the axial direction of the orientation roller. Then, the stacked glass fibers were sewn with a polyester thread in a direction orthogonal to the orientation direction to obtain a 300 g / m ² oriented glass fiber mat.

Five pieces of this oriented glass fiber mat are stacked,
A large number of test pieces A were produced by impregnating and curing an unsaturated polyester resin in an amount twice the glass fiber weight, and cutting the obtained glass fiber-reinforced resin plate having a thickness of 3 to 4 mm. Then, with respect to the test piece A, the tensile strength, the bending strength, and the bending elastic modulus in the transverse direction (the orientation direction of the glass fiber) and the longitudinal direction (the direction orthogonal to the orientation direction) were measured, and the results are shown below. The results are shown in Table 1.

For comparison, 300 g / m ² non-oriented glass fiber mat sewn with polyester thread was prepared, and 5 sheets of this mat were stacked and impregnated with an unsaturated polyester resin in an amount twice the glass fiber weight. Cured and obtained thickness 3 ~
A 4 mm glass fiber reinforced resin plate was cut to obtain a large number of comparative test pieces B. Then, with respect to this comparative test piece B, tensile strength, bending strength, and bending elastic modulus in the longitudinal direction and the transverse direction were measured in the same manner, and the results are shown in Table 1 below.

The tensile strength is determined by the JIS K 7113 test method, and the bending strength and flexural modulus are determined by JIS.
Measured by the test method of K 7171,
In each case, the average value of the measured values of five test pieces is shown.

[0067]

[Table 1]

As can be seen from Table 1, in the non-oriented comparative test piece B, the tensile strength, the bending strength, and the bending elastic modulus did not change much in the longitudinal direction and the transverse direction, and they were in the sewing direction. It is slightly larger in the vertical direction. On the other hand, the test piece A of the present invention in which most of the glass fibers are oriented has a tensile strength
Both the flexural strength and the flexural modulus significantly increase in the transverse direction, which is the orientation direction, and the effect of improving the strength by the orientation is remarkably exhibited.

[0069]

As is clear from the above description, in the oriented glass fiber mat of the present invention, 60% or more of the glass fibers are oriented in one direction, so that the mat easily extends in the orientation direction and is impregnated with resin. When it is cured, the physical properties such as the mechanical strength in the orientation direction are remarkably improved, and the glass fibers are not separated into pieces, so that the handling is easy. The arrangement of the reinforcing yarn inside the mat or on the surface layer of the mat also has the effect of significantly improving the tensile strength in the direction orthogonal to the orientation direction of the glass fibers.

Further, in the manufacturing method of the present invention, in the glass fiber orientation and stacking process, most of the glass fibers are efficiently oriented in one direction by the vibrating orientation member and the orientation rollers which are reversed to each other on the belt conveyor. Since they can be dropped and stacked, the oriented glass fiber mat of the present invention can be easily and reliably mass-produced by performing sewing, impregnation with a binder, or needle punching in the next step.

[Brief description of drawings]

FIG. 1 is a perspective view of an oriented glass fiber mat according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an oriented glass fiber mat according to another embodiment of the present invention.

FIG. 3 is a plan view of a glass fiber orientation device used in a manufacturing method according to an embodiment of the present invention.

FIG. 4 is a sectional view of the device.

FIG. 5 is an explanatory diagram of an alignment member of the device.

FIG. 6 is an explanatory diagram of a vibration applying unit in the same device.

FIG. 7 is a plan view of a glass fiber orientation device used in a manufacturing method according to another embodiment of the present invention.

FIG. 8 is a front view of the same device. FIG. 9 is a sectional view of the device.

FIG. 9 is a cross-sectional view of the same device.

[Explanation of symbols]

M oriented glass fiber mat 1 glass fiber 2 Threads for sewing 3 reinforcement yarn 4 Belt conveyor 5,6 Glass fiber orientation device 5a Orienting member 5j Mutual gap between orientation members 6a Orientation roller 6b Mutual gap between orientation rollers

Claims (9)

[Claims] 1. A method in which 60% or more of the glass fibers stacked in layers are oriented in one direction, and the stacked glass fibers are sewn with threads in a direction orthogonal to the orientation direction of the glass fibers. Oriented fiberglass mat to be. 2. An oriented glass fiber mat, wherein 60% or more of the glass fibers stacked in layers are oriented in one direction, and the stacked glass fibers are bound by a solvent-soluble binder. . 3. An oriented glass fiber mat characterized in that 60% or more of the glass fibers stacked in layers are oriented in one direction, and the stacked glass fibers are intertwined with the glass fibers erected by needle punching. . 4. A large number of reinforcing yarns arranged in the mat or on the surface layer of the mat in a direction orthogonal to the orientation direction of the glass fibers, according to any one of claims 1 to 3. Oriented fiberglass mat. 5. A plurality of elongated orientation members having a triangular chevron cross-sectional shape are arranged above the belt conveyor in parallel with each other in parallel with each other so as to be orthogonal to the direction of travel of the belt conveyor. While being vibrated, the glass fiber is supplied onto the orienting member, and the glass fiber is dropped from a mutual gap of the orienting member onto a belt conveyor, which has a glass fiber orientation and stacking step, orientated glass. Manufacturing method of fiber mat. 6. A plurality of orienting rollers are arranged above the belt conveyor in parallel with each other so as to be orthogonal to the traveling direction of the belt conveyor and in parallel with each other, and the orientation rollers are rotated in the opposite direction every other direction. As such, and while simultaneously rotating each orientation roller so that the rotation direction of the orientation roller at both ends is inward, while supplying the glass fiber on the orientation roller,
A method for producing an oriented glass fiber mat, comprising the steps of orienting and stacking the glass fibers, in which the glass fibers are dropped onto a belt conveyor through a gap between the orientation rollers. 7. The glass fiber orientation and stacking process according to claim 5, wherein the glass fibers stacked in the stacking process are sewn with a thread in a direction orthogonal to the orientation direction of the glass fibers in the next process. The manufacturing method described in. 8. A glass fiber stacked in the glass fiber orientation and stacking step is impregnated with a binder dissolved in a solvent in the next step.
Alternatively, the manufacturing method according to claim 6. 9. An orientation and a stacking process of glass fibers, wherein a part of the glass fibers is erected by treating the glass fibers stacked in the stacking process with a needle punch in the next process. Item 6. The manufacturing method according to Item 6.