JPS58212936A - Fiber reinforced resin tubular body - 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 fiber-reinforced resin tubular body, and more specifically,
This invention relates to tubular bodies such as fishing rods and golf shafts made of fiber-reinforced resin.

The tubular body of fiber reinforced resin (hereinafter referred to as F Rl) is
Conventionally, various molding materials have been used, one of which is unidirectional Buri Preglucy 1 (hereinafter referred to as "U").
There are products molded from D prepreg. Unidirectional Bripreg sheet is made by arranging reinforcing fibers such as carbon fibers and glass fibers in a sheet shape in parallel in one direction, and adding a thermosetting resin such as pre-cured J Bogishi resin or unsaturated polyester resin to this sheet. It is impregnated.

Molding of an FRP tubular body using the above-mentioned (1) prepreg is generally performed as follows.

That is, first, prepare a taper mandrel (1 mandrel) with an outer diameter approximately equal to the inner diameter of the tubular body to be molded,
After applying a release agent to the outer surface of the UD prepreg, stamp the UD prepreg the desired number of times so that the fiber axis of the reinforcing fibers faces the desired direction, and then wrap the heat-shrinkable F1 tape spirally around it. The resin is wrapped in a shape [ ], heated to harden the resin under the molding pressure of the heat-shrinkable tape, cooled, and then molded by pulling out the mandrel. After molding, some processing may be performed.

By the way, fishing rods are required to be as light as possible and have a high bending strength 1η. In other words, anglers spend extremely long hours, sometimes from early morning until midnight.
Moreover, he continues to operate the fishing rod on bad footing. Therefore,
Anglers are extremely fatigued, so a lightweight fishing rod is desired, even if it is only 100 yen.

Also, some anglers carry many different types of fishing rods to the fishing spot.
Different fishing rods are used depending on the fishing location and the type of fish, but in such cases, even if the weight of each fishing rod is small, the overall weight becomes so large that it cannot be ignored. On the other hand, the issue of bending strength is extremely important because most of the stress applied to fishing rods is bending stress, and bending rigidity is said to be the lifeblood of a fishing rod, as well as its suitability. Moreover, the bending stress is often shocking, and not only do you not always catch the same size or type of fish, but also the bending stress may not always catch the same size or type of fish. This bending strength can be improved by increasing the amount of reinforcing fibers used, but this not only increases the wall thickness and outer diameter and increases the weight, but also increases the strength of the reinforcing fibers. Since it is a special 1Jid, it is expensive, which increases the cost.In this way, fishing rods are required to simultaneously solve the contradictory issues of reducing weight and improving bending strength.

The situation is exactly the same for golf shirts.

In other words, if the shirt 1 can be made lighter, the weight of the head can be increased by that amount, and if the head can be made wider, that is. It is possible to make the initial velocity of the ball steeper, making it possible to send the ball farther.Also, since the bending stress that is applied to the shaft when hitting the ball is great, the shaft must have a large bending strength to withstand this stress. Ina [must be played.

In addition, golf shirts are required to have high bending rigidity. In other words, in order to hit the ball accurately in the direction and position of the target, the face must be stable when swinging the club and the head hits the ball. Therefore, it is necessary to increase the bending rigidity to stabilize the posture of the club during the swing (J).

By the way, "R1" has high strength and rigidity in the fiber axis direction of the reinforcing fiber, but these characteristics are +iv+ from the fiber axis direction (having an angle to the fiber axis direction). In other words, the bending strength of the FRP tubular body is The highest value seems to be obtained when the reinforcing fibers are wound in the longitudinal direction of the mandrel, that is, when the reinforcing fibers are arranged in such a way that their fiber axes lie in the longitudinal direction of the tubular body.However, in this case, bending stress is applied. The strength against compressive deformation in the cross-sectional direction (hereinafter referred to as compressive strength) that occurs when
The tubular body will bend into the cylinder. That is, the bending strength never increases due to buckling due to bending.

In order to solve this problem, conventionally, for example, J, which is described in Japanese Patent Publication No. 54-36624, two LJ sheets with the same amount of reinforcing fibers per unit area were used.
Using D prepreg, wrap it around a mandrel. When rolling, overlap these two UD prepregs by hand so that the fiber axes of their reinforcing fibers intersect with each other.
In other words, the fiber axis of the reinforcing fibers of one of the tJ r) prepregs is in the longitudinal direction of the mandrel.
On the other hand, the reinforcing fibers of the D prepreg are wound around the mandrel so that they face in the circumferential direction. ? 1' That is, this provides a reinforcing effect against compression by arranging reinforcing fibers in the l^l 1j direction of the tubular body, and prevents the buckling mentioned above.
This is the first thing I want to do. However, as a result, the compressive strength becomes higher than necessary.

However, the degree of compressive deformation in the cross-sectional direction that occurs on the platform when a bending stress horn is applied to the tubular body is considerably smaller than the degree of bending deformation in the longitudinal direction that occurs at that time. No circumferential reinforcement measures are required. on the other hand,
In order to provide the tubular body with a desired stiffness, for example bending stiffness, it is necessary to arrange reinforcing fibers in the longitudinal direction of the tubular body. However, when two sheets of tJD prepreg with the same amount of reinforcing fibers are stacked together, there are many reinforcing fibers around the dark blue skewers. This overspec makes the wall thickness and outer diameter larger than necessary.
Not only does this increase the flow of the tubular body, but also the excessive use of expensive reinforcing fibers such as carbon fibers].

5. Problems such as those mentioned above can be solved by
) Prepreg, which is rolled so that the fiber axis of the reinforcing fiber faces the circumferential direction of the mandrel. However, with V2 winding (J length is
In order to make the wall thickness of the tubular body uniform, the length is usually adjusted by winding the mandrel an integral number of times, but it is extremely difficult to obtain the optimum compressive strength by such operations alone.

The object of the present invention is to solve the above-mentioned vacancies in the conventional tubular body, to provide high bending strength even when a small number of reinforcing 4i fibers are used, and not only to have a smaller wall thickness and outer diameter, making it lighter in weight, but also to provide a tubular body. −
It is cheap and suitable for fishing rods and golf shafts.
To provide a P tubular body.

The present invention is directed to a tubular body made of a fiber-reinforced resin, the tubular body comprising a first layer in which reinforcing fibers extend in the longitudinal direction of the tubular body, and a first layer in which reinforcing fibers extend in the longitudinal direction of the tubular body; the first and second layers collectively form a substantially unundulated vortex layer extending in the circumferential direction of the tubular body; The second layer is characterized by a fiber reinforced resin tubular body in which the amount of reinforcing fibers in the second layer is 80% or less of the amount of reinforcing fibers in the first layer.

To explain the tubular body of the present invention in detail, FIGS.
The figures are a schematic front view and a schematic side view, respectively, showing one embodiment of a two-layer prepreg sheet used for forming the tubular body of the present invention.

1 and 2, 1 is a UD prepreg (hereinafter referred to as a first LJ prepreg) which is in the tubular body and forms the first layer.
D prepreg), and 2 is this first U D
U D attached to the prepreg 1 and forming the second layer
The prepreg (hereinafter referred to as second UO prepreg) forms a two-layer structure as a whole. These first and second UD prepregs 1.2 are made of reinforcing fibers 3 made of multi-filamen 1 of high-strength, high-elasticity fibers such as carbon blue, glass fibers, and organic high-modulus ↑11 fibers. They are arranged in parallel in the direction of sea 1 and are impregnated with a thermosetting resin (indicated by "Z") such as pre-cured epoxy resin, unsaturated polynisder resin, or phenolic resin 4T. .And the above first and second IJ1]
The prepregs 1.2 are attached so that the fiber axes of the reinforcing fibers of each of these UD prepregs are orthogonal to each other. Note that 4 is a release paper having 11 pieces of two-layer prepreg sheet 1-, which is peeled off during molding.

In the above, the first LJ D prepreg has reinforcing fibers of 55 to 500 Q/rn2 when PA fibers are assembled.
, for glass fiber r70~6.50 (J/T1
12. 35 to 325 Q/in the case of organic high elastic fibers
About T112 is used, and the resin content is 20 to 60% by weight, preferably 25 to 50% by weight (8%).On the other hand, the second tJD prepreg has a unit area of The amount of reinforcing fiber used per unit, that is, 1TII2
The reinforcing fiber usage H6 per unit is not more than 80%, preferably not more than 50% of that of the first U D prepreg, in which the resin content of the second U D prepreg is less than that of the first U D prepreg. It is preferable that the lJD of the second U D prepreg is slightly higher than that of the rib reg. That is, if the tree 11ttt'M percentage of the second U D prepreg is the same as that of the first U (2) The amount of resin (2) decreases, and the adhesion to the first prepreg deteriorates.

In the above embodiment, the reinforcing fibers used in the first and second U D prepregs are of the same type.
＼Preferable, and most preferable to be made of solid fiber.

However, combinations of different types of reinforcement 414ft, e.g. It is also possible to use carbon fiber for the JD prepreg and use crow silk/V) organic high elastic fiber for the second ID prepreg.

Furthermore, it is most preferable that the first and second U D prepregs be attached perpendicularly to the fiber axes of the reinforcing fibers as shown in Embodiments 1 and 1. The angles may be so-called oblique, such as at an angle of ±25 degrees or more and less than ±90 degrees.

Of the first and second UD prepregs attached to the fabric,
The second tJ f) The usage period of reinforcing fiber shoulder 1 per unit area of the prepreg is 80% or less, preferably 50% or less of that of the first UD prepreg, by F Rl) Tubular body technician. This is to ensure that optimal circumferential reinforcement is performed when a desired amount of reinforcing fibers are arranged in the direction, and that the compressive strength does not reach A-bar spec. 2nd tJ D The use of reinforcing fibers per unit area of prepreg
If you want to make it less than the same percentage as that of prepreg, two sheets of tJ
Although it varies depending on the intersection angle of the fiber axes of the reinforcing fibers of the D prepreg and the use of the tubular body, as mentioned above, the
There is no problem if it is less than %.

A two-layer prepreg sheet like the one above can be manufactured in a variety of ways, but the following is a terrifying example.

That is, gi coated with a precured thermosetting resin
Arrange the desired amount of reinforcing fiber strips (~land) in the -h direction on the 11 pattern paper in the form of a parallel + IJ case 1~, overlay the release paper on top of it, and add 70~170'C1, preferably 80~150'C1~.
” Pass through a heated press roll, number 4 per 1 cm.
Apply a linear pressure of 200 gram to spread out the land, transfer the resin, impregnate it, cool it down, and then stack it, peel off the release paper, and prepare the first U D prepreg. , that is, the UD with more reinforcing fiber usage per unit area.
Obtain prepreg material.

Exactly as above, 'C1 but using less reinforcing fiber, the second glue D prepreg wood, i.e. AA 4i1
To obtain a UD prepreg material using a smaller amount of reinforcing fiber per area.

Next, the above-mentioned first and second UD prepreg search results, the first,
The second prepregs are stacked so that they face each other and the fiber axes of both reinforcing fibers intersect at an arbitrary angle, and are passed through a press roll heated to 50 to 100°C, with a few kilograms per cm. [After applying 1 gram of linear pressure and pasting them together, the second U I)
Peel off the pattern. 8j, a two-layer prepreg sheet supported on the first U I') prepreg wood release paper is obtained.

[When forming an FRP tubular body using a two-layer prepreg sheet, the first LJ l
') It can be carried out in exactly the same manner as the conventional method described in 14 above, only by making sure that the fiber axis of the reinforcing fibers of the prepreg runs in the longitudinal direction of the mandrel.

Next, the tubular body of the present invention will be explained in detail based on one embodiment thereof.

Example Carbon fiber l-land trading card "M4" manufactured by Toshi Co., Ltd.
0B-600, 0-50B (hereinafter referred to as trading card M40), strands made of the same material.
King 300B-3000-40E (hereinafter referred to as Trueno JT30
0), 1, prepreg boxy resin composition #2500 made by the same company (hereinafter referred to as epoxy resin), and 10.
Two types of l1lll patterns were prepared: 80n+n+ width and 550IllII1 width.

Next, using a 1-tar, the ratio of 1080 mm width (1
One side of the mold was coated with L-Kipokin resin to a uniform thickness and a coating weight of about 700 per Tn2 to obtain a pattern paper before epoxy resin application (hereinafter referred to as medium coated paper). . Exactly the same, but this time with 550nIII
Using a 1-width release paper, the epoxy resin coating was approximately 27.
After obtaining the epoxy resin (r cloth paper (hereinafter referred to as lightweight cloth paper)) which is 5Q/■2, the epoxy resin coated surface was coated with 1008
385 trading cards M40 per n + m width are arranged in parallel and in a sheet form so that the fiber axes are 4T in the direction of the operator of the intermediate coating A14 paper. Pass it through a press roll heated to ℃ and apply a linear pressure of about 5 KC per 1 am to spread the stone: L
After transferring and impregnating the boxy resin, peel off the release paper that has been mixed with a rough 1p layer, and use 1til [the amount of 1-RECA M40 supported on the pattern paper, per 1TI+2 is about 13
90, and the content of epoxy resin is about 34% by weight.
e) Prepreg was obtained.

On the other hand, in the same way as above, this time, apply 111 light coats.
Use paper and apply 5031111 to the epoxy resin coated surface.
Line up 70 pieces of 1~Reka T300 per width, overlap the front pattern paper on top of it, and press this heated to about 130°C [
Transfer and impregnate the I-boxy resin by applying a wire 1'E of about 5 kg per 1 cm,
- Trading card T300 per Tl12 carried on (
7) The hanging is approximately 27, 50 jL No. 1 (7) LJr) 7
A second UD prepreg was obtained which was about 20% that of the 1J preg and had an epoxy resin content of about 50% by weight.

Next, the first (Jl') prepreg was cut into a length of 1000 mm in the longitudinal direction of the section, and 1081
A large number of cut pieces of 08O1000mm were cut 1n. On the other hand, regarding the second tl D prepreg, cut off both side edges along with the front pattern paper to have a width of 5.00 mm, and then cut it into a length of 1000 mm in the longitudinal direction, and cut it into a 500 m1 piece.
A number of fragments of n×1000111111 were obtained.

Next, the first and second UD prepreg shredded pieces are placed in the first tJ so that the prepreg surfaces of A face each other.
Lay them one on top of the other so that the 1AIi dark blue axis of trading card M40 of the D prepreg cut piece and the fiber axis of trading card 1"300 of the second prepreg cut piece are perpendicular to each other, and pass through a press roll heated to about 90 ° C. A linear pressure of approximately 3 KQ per 1 CI11 was applied to the adhesive, and the first UD prepreg cut piece, trading card M40, was cut to a length of 40 On+m and a width of 192 mm so that the fiber axis direction of the trading card M40 was in the longitudinal direction. The release paper was peeled off to obtain two-layer prepreg sheets 1 to 1 consisting of first and second jJO prepregs.

Next, the outer diameter 2
0m+n, length 600mm mandrel, the above two-layer prepreg sheet is rolled so that its longitudinal direction is the longitudinal direction of the mandrel, and the second (J1) prepreg is on the inside. /C.These days, 2
I+ with the width of the layer prepreg sheet set to 192 mm
'I was able to wrap and attach exactly 33 times to the mandrel during the Song Dynasty. □ Next, wrap a polyester tape with a thickness of 215 μm and a width of 12 mm on top of the 4-digit 2-layer prepreg sheet 1~ while applying a force of about 2.4112 mm and 2 nm.
+n+ each A-burlap μ while winding spirally f=
After boiling, heat in a heating furnace at about 130°C for about 2 hours.
1 Heat to avoid hardening the epoxy resin, cool and pull out the mantle 1 to 1. External diameter is 21 mm, internal diameter is 2011111.
One tubular body of the present invention was obtained.

Next, the above tubular body was cut into 11 pieces, each having a length of 15n+m.
A test piece was obtained.

Next, the cut surface of one of the above test pieces was polished and then observed with an optical microscope. The observation results are shown in the photograph in Figure 3 (magnification: 10
0x).

From FIG. 3, it can be seen that the F Rl) tubular body of the present invention is
First layer (thick layer) formed by D prepreg
and a second tJ D prepreg formed by /=
The second layer (thin layer) has no waviness in the circumferential direction,
It can be seen that a good spiral layer with a uniform thickness is formed. Also, the distribution of 1 Helle force M40 in the first layer/+
(Extremely -
] Since the trading card T 300 is continuous and unbroken, it can be seen that the trading card T 300 is precisely arranged in the circumferential direction and does not meander in the longitudinal direction of the tubular body. In other words, the tubular body of the present invention has voids and reinforcement points where bending stress is concentrated when applied.
It has substantially no bending. Therefore, even products using the same reinforcing fibers have high bending strength. In addition, voids and reinforcement
Since the tubular body of the present invention has substantially no bending in the il, it can be said that there is extremely little variation in properties between products.

Next, in order to measure the strength against compressive deformation in the cross-sectional direction of the tubular body, that is, the compressive strength, the remaining 10 test pieces were tested using a universal testing machine Is-' manufactured by Shima TL Co., Ltd.
2000 was used to conduct the FF shrinkage test.

For compression strong electric current, place the test piece between both grips of the testing machine (1) with the end of the winding of the two-layer prepreg sheet (A) facing directly sideways.
J: Sea urchin, 2.5111111/min fastpox load 10
, and the load (Kl) is defined as the load when the end of the winding peels off and jumps.In addition, the compressive deformation of the culm I9 when the end of the winding peels off is defined as (1-line drawing). It was determined as the difference from the outer diameter of the test piece.

As a result of the measurement, the average value of 10 test pieces was 8.37 KO for Ft-strength 1, and the amount of compressive deformation was 46 mm. The first and second UD prepreg sheets are rolled onto a mandrel and stacked together by hand when rolling, and then the release paper on both sides is peeled off to form a two-layer prepreg sheet for 11 minutes. An FRP tubular body was obtained in exactly the same manner as in the example. At this point, the first and second UD prepregs were not firmly adhered to each other for one minute only by manual stacking, and when the release paper on both sides was peeled off, the tensile force caused the Opening occurs in the second UO prepreg and 1 to Reca T3
The arrangement of 00 has become disordered. Also, when peeling off the release paper (first, second, and ID prepreg 1), some parts of the adhesive 1 of the ID prepreg may peel off, creating air pockets. Coupled with the opening hearing, the second Ll
r) Some parts of the prepreg (floated up. Rough)
For this floating purpose, two-layer prepreg sheet 1~
When winding the JD prepreg onto a mandrel, the second JD prepreg became wrinkled, and the arrangement of the 1-RECA T300 became even more disordered.

FIG. 4 shows a cross-sectional photograph of the F tubular body taken at 1lIi (A8 ratio: 100) in the same manner as described in "-".

From FIG. 4, it can be seen that the first and second layers of this tubular body, especially the second layer, are highly undulating and do not form a precise 1> spiral. Furthermore, there are human-like voids in places between the first and second layers (parts that appear dark), which are thought to be caused by air trapped during stacking by hand. In this case, the bending stress applied to the tubular body is concentrated in the voids, so the bending strength of the tubular body must be very low, and the variations in properties between products will be very serious. Also, the second layer is broken in some places.
C observed<'. In other words, this indicates that the L-Reca T300 forming the second layer is not accurately arranged in the circumferential direction of the tubular body, but meandering in the longitudinal direction. In this case, the circumferential reinforcing beams suitable for the use 733 of the trading card "300" are not used, and the variation in characteristics becomes large.

Next, when this tubular body was subjected to the same compression test as in the example described in -, the average value of the compressive strength was 7°69 K O
This was about 7% lower than that of the tubular body of the above example. In other words, the tubular body of the present invention shows that even with a small amount of reinforcing fiber used, a high strength and negative strength can be achieved. Therefore, with the same strength of 1η, the wall thickness and outer diameter can be made smaller and the weight can be reduced, and the amount of reinforcing fiber used can be reduced by 1. reduced. Moreover, the average value of the amount of compressive deformation of this tubular body is 3
, 9 nv or '<C indicates that it will be destroyed.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams showing an embodiment of a two-layer prepreg sheet used for forming the F Rl tubular body of the present invention, with Figure 1 being a front view and Figure 2 being a front view. FIG. FIG. 3 shows reinforcement 51i of the cross section of the FRP tubular body of the present invention.
This is an optical micrograph (100x magnification) showing the shape of at. Figure 4 shows reinforcement 1 of the cross section of the conventional F II P tubular body.
Optical micrograph showing the shape of Jji navy blue (magnification 100 (8
). 1: 10th LJ I) Prepreg 2; 2nd UO prepreg 3: Reinforcing fiber 4: Release paper Special accommodation applicant Toshi Co., Ltd.

Claims (1)

[Scope of Claims] A tubular body made of fiber-reinforced resin, the tubular body comprising a first layer in which reinforcing fibers extend in the longitudinal direction of the tubular body and a first layer in which reinforcing fibers extend in the circumferential direction. The first and second layers collectively form a substantially unundulated spiral layer extending in the circumferential direction of the tubular body, and the reinforcing fibers of the second layer ll amount is 80% of the first layer reinforcement 11i
A fiber-reinforced resin tubular body characterized by the following: