JPH0976357A - Continuous production method of rod-shaped article having convex portion - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To obtain a high degree of shearing force resistance between a pultruded product and the convex portion by sequentially processing the pultruded product coming out of the pultrusion molding process to form a convex portion. Continuous bar-shaped product with high productivity. SOLUTION: A string-shaped material is spirally wound around a pultruded product, and then a liquid resin is applied to the entire surface and the resin is impregnated into the string-shaped material, and then a resin curing step is sequentially performed. A method for continuously manufacturing a rod-shaped object having a convex portion and a surface covered with a resin layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod-shaped material obtained by a pultrusion method and having a spiral convex portion on the surface, and the surface including the spiral convex portion is substantially covered with a resin-hardened material, which is suitable for a concrete reinforcing material. Regarding

[0002]

2. Description of the Related Art As a method for producing a rod-shaped article having a surface in the long axis direction by a pultrusion process comprising a thermosetting resin and long fibers, a bundle of long fibers, that is, roving is heated in front of a drawing die. A method is known in which a rod-shaped material is obtained by impregnating a curable liquid resin and spirally winding a string-like object around a bundle of rovings that bears the pulling force, and then hardening it through a mold. .

However, according to this method, it was difficult to manufacture a product having a uniform appearance due to uneven appearance of the heights of the convex portions. Therefore, some of the inventors of the present invention made an invention in which the height uniformity of the convex portions was improved, and applied for a patent. According to this, when the rod-shaped material is embedded in concrete and pulled out, the difficulty of pulling out, that is, the adhesive strength with concrete was able to exert the performance comparable to that of deformed rebar, but the productivity is sufficiently increased. From a point of view, there are many points to be further devised. These are not due to the presence of the surface layer intentionally, but the convex portions are due to the presence of the roving spirally wound.

On the other hand, a rod-shaped article in which a surface layer is intentionally provided and unevenness is given to the layer is also disclosed in, for example, Akira Sumitani: Reinforced plastics vol. 41 (1995) 150, and Mark Kaiser: Reinforced P.
It is known by Lastics April (1995) 4 and the like. Although the manufacturing method for them is not clear, the former unevenness is a recess formed in the surface layer, and the latter convex part causes sheet molding compound (SMC) to exist on the surface of the pultrusion product, and the convex part It is pressure-cured as it occurs. In the former case, in order to make the depth of the recesses 0.4 mm or more, the tensile strength of the rod-shaped material must be sacrificed, and at a depth of 0.4 mm or less, the concrete adhesive strength is obviously inferior to the deformed bar. Will cause the problem. Although the numerical value of the adhesive force of the latter is unknown, it requires additional SMC allowance and equipment such as a pressure curing device, so that it is doubtful whether it is an advantageous method as an industrial manufacturing method because of high processing cost.

[0005]

SUMMARY OF THE INVENTION The present invention employs a method of spirally winding a string-like material such as roving around a pultruded rod-shaped object, and in this method, a rod-shaped object having sufficient adhesive force is produced with high productivity. It is intended to provide a method for continuous production.

[0006]

According to the present invention, there is provided a step (1) of producing a pultruded article comprising a thermosetting resin and a long fiber, and a step of spirally winding a string-like article on the obtained pultruded article ( 2) Next, a step (3) of applying a liquid resin to the surface thereof, and a step (4) of subsequently curing the applied liquid resin are sequentially performed to cover with a substantially liquid resin cured product. It is a continuous manufacturing method of a bar-shaped article having a convex portion.

Further, according to the present invention, a step (5) of undercoating the liquid resin between the step (1) of forming the pultrusion molded article and the step (2) of spirally winding the string-like article in the above manufacturing method. Is a continuous manufacturing method of a rod-shaped material having a convex portion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In a method of winding a string-shaped object in a spiral shape on a pultruded product to make a rod-shaped object having a convex portion, when the rod-shaped object is used as a concrete reinforcement, The adhesive force improves as the pitch of the wound string-like material is reduced. However, if the winding pitch of the string-shaped material is made smaller, the consumption of the string-shaped material attached to the spiral winding machine and the liquid resin for impregnation of the pultruded molded product per unit length increases in the method according to the previous application, and as a result, You must often have a downtime to replenish it. In addition, for example, the drawing speed is 2 m / min, the pitch of the winding string-like material is 10 mm
In such a case, the rotation speed of the spiral winding machine is as high as 200 rotations / minute.

The manufacturing method according to the above-mentioned patent application based on the invention made by a part of the present invention has the advantage that the equipment itself is simple as a whole system, but liquid resin exists in the rotating part of the spiral winding machine. Because of this, high speed rotation is difficult.
Therefore, in the present invention, the string-like material is wound as it is without being impregnated with the resin.

Another important factor affecting the adhesion to concrete is the adhesive performance of the liquid resin impregnated into the string-shaped material to the pultrusion molding. Further, as another factor, there is the existing shape including the resin on the pultrusion molded article obtained by impregnating and hardening the resin. Examining the fracture state of the convex portion of the rod-like object to be tested that has been subjected to the adhesion measurement test to concrete, there is shear fracture of the interface between the pultrusion and the string containing the resin, It was hardly observed that the liquid resin cured product used for impregnation of the string-like material remained on the pultruded product. That is, it was confirmed that the lack of the force to withstand the internal shearing or breaking of the resin does not deteriorate the measured adhesive force.

[0011] Therefore, the inventors of the present invention turned to research for imparting a force capable of withstanding shear fracture at the interface between the pultruded product and the string-like product.
FIG. 1 (a) shows a cross section in the long axis direction of a rod-shaped article manufactured based on the invention previously applied for a patent. The string-shaped article 1 impregnated with the liquid resin and cured is thinly covered with the liquid resin cured material 2. ,
It is bonded to the pultrusion molded article 4 via the interface 3. Almost the surface of the pultruded molded product is exposed as it is in the valleys between the string-shaped products 1 and 1, and the area of the interface 3 is small and isolated. As shown in Fig. 1B, the cross-sectional view of a rod-shaped object that is a pultruded product is further coated with a liquid resin and cured. Since the interface 3 between the impregnated resin and the surface of the pultrusion product 4 extends over the entire surface, the area of the interface is remarkably increased. It was found that the concrete adhesion test value of the rod-shaped material of (b) of FIG. 1 reaches 1.4 times or more of that of (a) of FIG. 1, though it depends on the pitch interval of the string-shaped material.

According to the present invention, as shown in FIG. 1B, that is, the rod-shaped article 4 is continuously drawn while performing the pultrusion process while the hem of the convex shape of the rod-shaped article 4 overlaps and pulls. The problem was solved by the method of making.

That is, as seen in one example of the continuous manufacturing apparatus for a rod-shaped object having a convex portion shown in FIG. 3 which is suitable for carrying out the present invention, the spirally wound string-shaped object 1 is not impregnated with the liquid resin as it is. After being wound on the pultrusion molded article 4 in this state, the impregnation of the liquid resin 2 into the string 1 and the coating of the pultrusion molded article 4 are performed together in the coating portion main body 10. By doing so, it becomes unnecessary to hold the liquid resin in the spiral winding machine. This made it possible to rotate the winding machine at a high speed and, on the other hand, replenishing only the cord-like material, which resulted in a significant reduction in the stop frequency of the apparatus. Furthermore, since it is possible to easily devise the equipment so that the string-shaped material 1 can be easily wound around the two pultrusion moldings at a desired pitch interval, the rotation speed of the spiral winding machine can be further improved. There is a big advantage that it can be halved. Even if the productivity is increased, there is an advantage that the rotation speed of the spiral winding machine does not become the rate limiting.

Further, in consideration of the fact that the rod-shaped material is often embedded in fresh concrete and used as a so-called concrete reinforcing material, the rod-shaped material has a hydrogen ion concentration of pH.
It must withstand a strong alkalinity very close to 14.

Liquid resins used in the pultrusion molding include bisphenol A polyester, vinyl ester resin and epoxy resin as the liquid resin which can withstand the strong alkalinity, and all of them have a curing rate in the pultrusion molding. The bisphenol A polyester and the vinyl ester resin are much slower than the orthophthalic acid-based or isophthalic acid-based unsaturated polyester which is generally widely used, and the epoxy resin is far inferior. Therefore, the pultrusion process of the liquid resin having the alkali resistance is a rate-determining step for manufacturing the rod-shaped material.

According to the method of the present invention, the alkali resistance depends on the liquid resin which is impregnated and applied after winding the cord-like material. Therefore, it is necessary to select an appropriate liquid resin having a fast curing rate which does not require consideration of the alkali resistance at the time of pultrusion molding. I can. Therefore, there is an advantage that the production rate limiting in the pultrusion process can be avoided if necessary.

The present invention relates to a pultrusion process (1) of a composition containing a roving bundle, etc. and a liquid resin, a string-shaped product spiral winding process (2) for the pultrusion product, and a string-shaped product. It is a requirement that at least a coating step (3) of applying a liquid resin on the pultrusion molded article wound with and a curing step (4) of curing the liquid resin of the application are included.

In the drawing step (1), the drawing molding machine, the resin and the long fibers fed into the drawing molding machine, and the operating conditions can be directly adopted by the drawing molding technique which is usually used.

As the string-like material used in the step (2) of spirally winding the pultruded product, a so-called roving of long fiber bundles such as glass fiber, carbon fiber and aramid fiber is used. However, since the string-shaped material used for the rod-shaped material of the present invention does not necessarily require high tensile strength and high elasticity like roving, the shape can be maintained in the subsequent application step (3) and curing step (4). Any organic fiber or inorganic fiber may be used. It may also be a string-like material made of short fibers.

The cross-sectional shape of the string-like material may be circular, rectangular or the like. Its thickness is difficult to express, but in the case of glass fiber roving, for example, 2200-4400T
It is about EX. When the roving of 2200TEX is used, the height of the convex portion of the product rod-shaped object is about 0.7 mm, and when it intersects, it is about 1.1 mm.

As a winding machine for spirally winding the string-like material on the pultrusion molded article, a commercially available ordinary winding machine can be used. The string-shaped material installed on the spiral winding machine should be as long as possible, and the string-shaped material unwound from the winding machine should be wound at a desired position on the advancing pultrusion molding. Place the product so that it can be guided to the immediate vicinity of the pultruded product by passing it through a pipe-shaped nozzle. Further, it is desirable to devise the string-like material so that a little tension is applied when it is wound.

For example, it is possible to easily wind two thread-like objects around a pultruded product at the same time and halve the number of revolutions of the spiral winding machine even if the thread-like objects have the same pitch. In addition to such a method of winding the string-like object, the two string-like objects are wound adjacent to each other as shown in FIG. There is also a method of expecting an improvement in adhesive strength in concrete. Further, by using one or two winding machines in which the rotating disks of the winding machine rotate in opposite directions to each other, the string-like material can be wound around the pultrusion molded article in a crossed manner. It is effective in improving the adhesion to concrete.

The impregnating and applying method to be performed in the applying step (3) for applying the liquid resin by impregnation may be any known method for applying the liquid to the solid surface having irregularities. For example, as the non-contact method, there are a method of spraying and applying a liquid resin containing a curing accelerator, a method of spraying and applying, and a method of applying and applying. In either method, the string-like material is impregnated with the liquid resin at the same time as coating, and since the shape of the object to be coated is thin and oblong, the surplus liquid is considered from the economical point of view. The resin is recovered and reused.

The appearance of the part where the coating step (3) is performed is
It is a horizontal cylinder, and the object to be coated is located substantially at the center in the longitudinal direction, and the liquid resin is supplied from a suitable number of points of the cylinder toward the center. If the object to be coated is sufficiently supplied with the resin solution, the impregnation of the string-like material that proceeds at the same time as the application is completed in 10 seconds or less, so the net length of the cylinder performing the application may be 50 cm. Considering that the excess resin is allowed to flow down and be removed from the object to be coated as much as possible, the length is preferably about 2 to 4 m.

The coating step (3) is carried out in order to avoid as much as possible the appearance of the cured liquid droplets on a portion of the obtained rod-shaped article having a convex portion, that is, the portion which was the lower portion of the rod-shaped article during the production.
It is preferable that the excess resin liquid that has been applied and impregnated is more positively removed during the period from to the curing step (4). For this purpose, it is desirable to pass the object to be coated between rollers or to make contact with a rubber spatula. However, since these treatments are not performed and even a rod-shaped material with a cured liquid droplet can function as a reinforcing material, removal of the excess resin liquid is not an essential condition of the present invention, but excess resin can be recovered. Target.

Further, brushing is applied as a contact method as a means for applying the liquid resin to the pultrusion molded article obtained through the step (2),
There is a roller coating method. In this method, by paying attention to the impregnation of the string-like material wound around the object to be coated, if the resin solution is dropped onto the upper part of the object to be coated, the excess resin solution before the next curing step (4) is performed. Has the advantage that it can be omitted or can be carried out easily.

The liquid resin used in the coating step (3) must be selected in consideration of the usage environment of the rod-shaped product which is a product. If it is to be used as a concrete reinforcing material, it is necessary to select at least a resin capable of withstanding strong alkalinity near pH 14 at pH 13.5 or higher. p
Examples of the resin that can withstand H14 include bisphenol A polyester, vinyl ester resin, and epoxy resin. In the case of manufacturing a rod-shaped material for applications that do not require such a high degree of alkali resistance, the resin is not limited to those resins, and any liquid resin used for pultrusion may be used.

The viscosity of the liquid resin used in the coating step (3) is about 500 to 3000 cps, which is easy to use when measured at 25 ° C. with a resin composition containing a curing agent and the like. Of course, the viscosity greatly differs depending on the method of impregnation coating, so this value is merely an example.

As a method of adjusting the viscosity of the liquid resin, various known means such as a method of selecting the liquid resin itself and a method of adding a small amount of fine particle filler can be adopted. In the subsequent heat curing step (4) following the coating step (3), the type and amount of the curing agent are easily determined within the range of knowledge obtained by ordinary pultrusion molding. When the liquid resin is a photopolymerizable resin such as vinyl ester, unsaturated polyester or urethane methacrylate, the photocuring method may be adopted in the step (4). As for these photo-curing curing agents, for example, Tomura et al .: Reinforced Plastics No. 5 (1987) 15
9, NOF catalog, visible light curing agent VLC, ultraviolet curing agent BTTB, etc. A release agent in the form of a phosphoric acid ester or a metal soap may be mixed with the liquid resin. However, it is better not to mix them in the step (3) of the present invention.

Next step of curing the applied liquid resin (4)
In the above, the object to be coated, which has undergone the step (3), is heat-cured or light-cured. For that purpose, a thermal cylinder heated to about 60 to 160 ° C. or an optical cylinder having a light source arranged on the inner surface is used. The thickness of the coating film of the object to be coated may be about 0.5 mm between the closely wound string-like objects, but most parts are about 0.1 mm. Is much easier than in the pultrusion process (1).

When the object to be coated is rapidly heated to a high temperature during heat curing, the viscosity of the liquid resin tends to decrease, and the resin liquid tends to drop to the lower part of the object to be coated.
It is desirable that the heating is performed in two stages at about 90 to 90 ° C and about 90 to 150 ° C in the latter half. If the length of the cylinder used in the curing step is 1 to 2 m, it is possible to correspond to a drawing speed of at least 2 to 3 m / min. The inner diameter of the cross section of the cylinder at right angles to the long axis direction may be any size that allows the object to be coated to pass through without touching its inner wall.

As is clear from the above description, the rod-shaped article referred to in the present invention has a convex portion made of a string-shaped article and a resin on its surface, and the entire outer side of the rod-shaped article is covered with a resin layer. Needless to say, the cross-sectional shape is not necessarily limited to a circle at the stage after the pultrusion molding step (1). It may be a rectangle such as an ellipse, an egg, a rectangle, or a polygon. Furthermore, they may be hollow. In particular, hollow rods have the advantage that they can be easily connected.

In the present invention, the undercoating step (5) may be interposed between the pultrusion molding step (1) and the spiral winding step (2). In the undercoating step (5), the drawing step (3) is applied to the pultruded product that has come out of the mold through the drawing step (1).
A liquid resin that is the same as or is compatible with the liquid resin used in (1) is appropriately applied together with a curing agent.

According to the present invention, by providing the undercoating step (5), the string-like material in the spiral winding step (2) is the same as the string-like material obtained by impregnating the drawn-out pultrusion molded article with the liquid resin. Not only is it easy to wind and spirally wind as if glued, but it is also useful for avoiding coating or impregnation defects between the string-shaped material and the pultrusion material. Further, since the coating is performed twice in combination with the coating step (3), it is effective in preventing the occurrence of coating residue on the coating surface.

As the coating method in the undercoating step (5), various known coating means can be adopted as in the coating step (3). As a simple method, since the cord-like material has not been wound yet in this step, as described below with reference to FIG. 4, 0.1 to 0.
There is a method in which a short mold-shaped cylinder having a hole in which a space of about 5 mm remains is prepared, liquid resin is press-fit applied while passing a pultrusion product, and excess resin liquid is recovered and reused if necessary. Alternatively, as shown in FIG. 6, an ironing coating device may be used in which the applied resin is stored between two rubber films or sheets each having a hole having a diameter slightly smaller than the diameter of the pultruded product.

According to the present invention, a rod-shaped material having a convex portion is formed by spirally winding a string-shaped material around a pultruded material that is being drawn from a mold, applying a liquid resin on the entire surface of the material, and curing it. Since it is manufactured continuously, (a) the area of shearing force applied during the concrete pull-out test between the convex portion and the pultruded product increases, and a strong adhesive force can be obtained. Therefore, the winding pitch of the string-like object can be increased, which leads to a reduction in the stop time for replenishing the string-like object of the winding machine. (B) Since it is a method of winding a dry type string-like object, unlike a method of winding a wet type string-like object,
A frequent stoppage for refilling the spiral winding machine with liquid resin is no longer necessary. (C) Even when the rod-shaped product is required to be environmentally friendly, it is possible to select a resin having a high curing speed regardless of the pultrusion process. As a result of these, according to the present invention, a rod-shaped material can be manufactured with high productivity.

Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 3 is a partial cross-sectional view showing an example of a continuous manufacturing apparatus suitable for carrying out a rod-shaped material having a convex portion according to the present invention. In FIG. 3, only the end of the die 5 of the pultrusion molding machine is shown, and the other parts are not shown. Also, the string-like object 1
Also in the spiral winding machine, the support of the rotary disk 7 having the bobbin 6 of the string-like material and the rotary drive part are omitted, except for the parts necessary for description.

A large number of carbon fibers or glass fibers are drawn and aligned, the pultrusion molding step (1) has been completed, and the pultrusion molded article 4 that has been pulled out from the mold 5 advances to the spiral winding step (2) where it is spirally wound. Due to the rotation of the rotating disc 7 of the machine, the string 1 is continuously supplied from the bobbin 6 installed on the rotating disc 7 to the pultruded product 4 which is advancing through the nozzle 8 attached to the disc. , A spiral winding of the string 1 is formed on the surface thereof.

Next, the spirally wound molded product 9 in which the cord 1 is spirally wound advances to the coating step (3). In FIG. 3, the coating unit main body 1
Reference numeral 0 denotes a cylindrical body having such a thickness that the spirally wound molded product 9 can pass without contacting the wall surface, and has a length of about 3 m. A liquid resin containing a curing agent is ejected toward the center of the spirally wound molding 9 at a position 30 cm from the inlet side, at a right angle from above, and from both lateral directions through the conduit 11. The spiral wound molded product 9 that has proceeded to the coating step (3) is applied with a liquid resin by the coating unit main body 10 to become a spiral wound coated molded product 12, and if excess resin is attached, a rubber spatula 13 is required.
Except for, proceed to the curing step (4). Receivers 14 are provided on the front and rear of the application unit body 10 and on the rubber spatula 13 portion.
Excess liquid resin is recovered.

In the curing step (4), the first half and the latter half are performed by the electrothermal curing cylinder 15 whose temperature can be controlled independently. The thickness of the cured tube is 5 to 10 between the molded article 12 and the inner wall of the cylinder so that the spiral wound coating molded article 12 passing therethrough does not touch the inner wall at all.
It is preferable to allow a margin of about mm.

The length of the curing cylinder 15 is 1.5 in each of the first half and the second half.
m. The spiral wound coating molded article 12 that has undergone the coating step (3) is a curing tube 15 in which a liquid resin is heated and cured to form a rod-shaped material 16 having a convex portion and a surface covered with the cured resin.
The obtained rod-shaped material is wound or cut into a suitable length with a cutter (not shown).

FIG. 4 is a partial cross-sectional view showing another embodiment of a continuous manufacturing apparatus suitable for carrying out the rod-shaped material having a convex portion of the present invention. In the apparatus shown in FIG. 4, the undercoating portion 17 for performing the undercoating step (5) has a die 5 and a rotating disk 7 of a spiral winding machine.
Exists between and. Other than that, each step is basically the same as the apparatus shown in FIG.

In FIG. 4, the pultrusion molded article 4 that has been drawn from the mold 5 after the drawing step (1) has been completed is the undercoating step (5).
To proceed to the undercoat section 17. The undercoat portion 17 has a length of approximately 30 cm and has a shape similar to that of the mold 5. However, the distance between the inner wall of the undercoat portion 17 and the outer periphery of the pultrusion molding 4 is 0.
The spacing is 2 mm. A liquid resin which is the same as or similar to the liquid resin used in the coating step (3) is supplied from the conduit 18 provided 8 cm from the inlet of the undercoat portion 17 to the undercoat portion 17
The inner surface of the pultruded article 4 is inserted between the inner wall and the outer periphery of the pultruded article, and the pultruded article 4 is primed. The pultruded molded article becomes the undercoat molded article 19 and proceeds to the spiral winding step (2). Excess resin liquid in the undercoating process is appropriately collected in the receiver 14.

In the example of FIG. 4, the rotating disk 7 of the spiral winding machine
Bobbins 6 and 21 around which the string-like objects 1 and 20 are wound are installed, and the string-like objects 1 and 20 are spirally passed through the nozzles 8 and 22 to the undercoat molding 19 (see FIG. 4). To make it easier, the cross section of the spiral formed by the cord 1 is outlined,
That according to 20 is shown in black. ) The winding is formed by the rotation of the rotary disk 7 and the progress of the undercoat molding 19 (in the direction of the arrow in the figure).

The undercoat spirally wound molded product 23 thus obtained proceeds to the liquid resin coating step (3). Application unit body 24
Is a contact coating method in which the undercoat spirally wound molded product 23 is sandwiched between a pair of coating rollers 25 and 26 capable of seeping out liquid resin from the center of the coating roller, and coated, as shown in FIG. Although not shown, six pairs of the rollers are attached to the coating section main body 24 with the rollers inclined by 30 °. Twelve conduits 27, 28, etc. connected to the center of each roller are fitted with flow rate controllers 29, 30, etc., respectively. The conduits 27, 28, etc. connected to the coating roller are connected via a conduit 31 to a resin liquid tank 32 containing a liquid resin containing a curing agent.

The undercoat spirally wound molded product 23 is roller coated in the coating section main body 24 to become an undercoat spirally wound coated molded product 33, which is the same curing cylinder 15 as the apparatus used in the description of FIG.
After that, the rod-shaped material 16 having a convex portion and the surface of which is covered with the hardened resin is formed.

[0047]

EXAMPLES The present invention will be described in more detail with reference to the following examples. In the description, all "parts" and "%" are "parts by weight" and "% by weight" unless otherwise specified.

[Example 1] The present invention was carried out by using the continuous manufacturing apparatus shown in FIG. Glass roving with a thickness of 4400 TEX (RER445FW-22, Nippon Sheet Glass Co., Ltd.)
100 parts of vinyl ester resin (8850L, manufactured by Nippon Yupica Co., Ltd.), and Perloyl TCP as a curing agent.
(Nippon Yushi Co., Ltd., trade name) 1.0 part, Percure 0
(Nippon Oil & Fat Co., Ltd., trade name), Percure HI (Nippon Oil & Fat Co., Ltd., trade name) 0.5 part and Ze as a release agent
LecUN (trade name, manufactured by DuPont, USA) consisting of 1.0 part and a resin composition having a viscosity of 550 cps at 25 ° C., passed through an impregnation tank, inner diameter 10 mm, length 1 m, mold temperature first half 90 ° C., second half 150 ° C. The mold 5 was passed at a speed of 90 cm / min to draw a round bar having a glass fiber content of 70% by volume. At higher speeds, curing was incomplete.

A glass roving of 2200 TEX was used as the string-like material, and the rotation speed of the rotating disk 7 of the spiral winding machine was set to 60.
The pultrusion was wrapped around as revolutions / minute. The pitch of the spiral winding roving is 15 mm. Next, proceeding to the coating step, three conduits of the coating unit main body 10 (only one conduit immediately above is shown in FIG. 3, but actually two conduits are provided at a position of 90 ° with the conduit 11). The same liquid resin as that used in the above-mentioned pultrusion molding was sprayed and coated on the spiral wound molding 9 except that the mold release agent was not included. At this time, the excess liquid resin was recovered by the receiver 14 and reused in the coating process. Then, the spirally wound molded product 9 proceeded to a curing cylinder 15 at a temperature of 180 ° C. for a residence time of 1.1 minutes and was cured therein to obtain a rod-shaped product 16 having a projection and a thickness of 11.4 mm.

[Embodiment 2] This embodiment is another embodiment using the continuous manufacturing apparatus shown in FIG. In the drawing step, the vinyl ester resin used in Example 1 was replaced with propylene glycol isophthalate unsaturated polyester (RP251
0, manufactured by Mitsui Toatsu Chemicals, Inc. was used. Withdrawal speed is 15
It reached 0 cm / min, and I still felt a little margin. The number of rotations of the rotary disk 7 of the spiral winding machine is 1 without any hindrance.
Pitch is 15 mm as in Example 1, with a rotation rate of 00 rpm.
The spiral wound molded product 9 was obtained.

Epoxy resin Araldite AER2 is applied.
50 parts (trade name, manufactured by Asahi Ciba Co., Ltd.) and 100 parts of diluent Heroxy WC-67 (trade name, manufactured by ACI Japan Limited), 15 parts, 2E4MZ (Shikoku Kasei Co., Ltd.)
The product has a viscosity of 1000 at 25 ° C. obtained by mixing 4 parts of 2MZ (trade name of Shikoku Kasei Co., Ltd.).
A liquid resin of cps was sprayed onto the coating section body 10. The obtained spiral wound coating molded product 12 passed through a curing cylinder 15 and was cured to obtain a rod-shaped product 16 having a projection and a thickness of 11.4 mm.

The rod-shaped products obtained in Examples 1 and 2 are
All had sufficient alkali resistance as concrete reinforcing materials. However, when attention is paid to the productivity, the second embodiment far exceeds the first embodiment. That is,
The present invention is not only capable of producing a rod-shaped product, but also has a further advantage that the productivity can be remarkably increased depending on the method of utilization.

In addition, a concrete pull-out test of the obtained rod-shaped material was carried out in the literature (JSCE: Concrete Technology Series 1).
P. 99 April 15, 1992) and the adhesion stress levels were calculated to be 108 and 160 kgf / cm ^{2 respectively.}
Met. The concrete compressive strength at that time is 33
It was 0 kgf / cm ² . The deformed iron bar having a diameter of 10 mm has an adhesion stress degree of 180 kgf / cm ² .

[Embodiment 3] This embodiment shows an example in which the present invention is carried out by using the apparatus shown in FIG. Carbon fiber roving (TR
30G 830TEX, 12000 filaments,
Mitsubishi Rayon Co., Ltd. made vinyl ester resin 100
Part, as curing agent perloyl TCP (NOF CORPORATION)
Made, trade name) 1.0 parts perhexa 3M (Nippon Yushi Co., Ltd., trade name) 1.5 parts and Zele as a release agent
A liquid resin composition containing 1.0 part of cUN (manufactured by DuPont, USA) and having a viscosity of 500 cps at 25 ° C. was passed through an impregnation tank in the same manner as in the first half of Example 2 to perform pultrusion molding. Molding speed was 75 cm / min, and curing failure was observed at a molding speed of 75 cm / min or more. The carbon fiber content of the molded product was 72.5% by volume.

This molded product 4 was passed through the undercoat part 17. Here, 100 parts of epoxy resin Araldite AER250 (trade name, manufactured by Asahi Ciba Co., Ltd.), diluent Heroxy WC-6
7 (manufactured by ACI Japan Limited, trade name) 5 parts, 2E4MZ (manufactured by Shikoku Kasei Co., Ltd., trade name) 5
Part, 2MZ (manufactured by Shikoku Kasei Co., Ltd., 1 part), a mixed solution viscosity of 3200 cps (25 ° C.) was press-fitted from the conduit 18 of the undercoat part 17 to obtain an undercoat molded product 19. Subsequently, the molded product 19 was advanced to the spiral winding step. Here, the rotation of the rotating disk 7 is 20 rotations / minute and the thickness is 1660 TEX,
Two carbon fiber rovings 1 and 20 each having a number of filaments of 24,000 were wound with a displacement of 20 mm from each other. Since the resin is attached to the undercoat molded product 19, the spiral winding of the roving can be easily performed by gluing onto the molded product 19. The undercoat spirally wound molded product 23 thus obtained was fed into the coating portion main body 24.

As shown in FIG. 5, the coating section main body 24 has six pairs of coating rollers, each pair consisting of two rollers, and coating was performed while the undercoat spirally wound molded product 23 passed between them. The composition of the liquid resin liquid used at this time is the epoxy resin Araldite AER2.
50 (manufactured by Asahi Ciba Co., Ltd., trade name) 100 parts, diluent HEROXY WC-67 (manufactured by ACI Japan Limited) 15 parts, 2E4MZ (manufactured by Shikoku Kasei Co., Ltd.) 4
Part, 2MZ (manufactured by Shikoku Kasei Co., Ltd.), 1 part of resin liquid at 25 ° C
The viscosity at was about 1000 cps. The coated undercoat spirally wound molded product 33 was passed through the curing cylinder 15 at 220 ° C. for 1.3 minutes to obtain a rod-shaped product 16 having a thickness of 12.4 mm. This product has an adhesion stress of 175 kgf / cm ² and a thickness of 1
It is equivalent to that of a deformed iron bar of 0 mm.

[0057]

EFFECTS OF THE INVENTION As a method of continuously producing a rod-shaped material having a convex portion by winding a string-shaped material such as roving, a method of winding the string-shaped material immediately before the pultrusion molding, and a method after the pultrusion There has been a method of winding a wet string-like material impregnated with a liquid resin. In the former, the formation of protrusions is uneven, it is uncertain, and the appearance is not uniform, and in the latter, when trying to increase the adhesive force with concrete, the winding pitch of the string-like object must be shortened. The restriction on the rotation speed of the attachment machine and the frequency of replenishment of the liquid resin for the wet string-like material are high, and it is necessary to stop the operation for the replenishment, which makes it difficult to improve the productivity.

Since the present invention is a method in which a string-shaped material is sequentially spirally wound after continuous drawing, and then a liquid resin is applied to the entire surface and sequentially hardened, a given product can be made into a given material. Since it can be manufactured at high speed, it does not have the problems in the above two methods. Further, even when the product rod-shaped product is required to be compatible with the use environment, the liquid resin can be selected in view of the curing speed in the pultrusion molding process, so that the rod-shaped product can be produced with high productivity.

Further, according to the method of the present invention, not only the molding processing cost is lowered, but also a system can be taken to meet an order even if the stock amount is reduced, and the industrial value of the present invention is extremely large. .

[Brief description of drawings]

1A and 1B are cross-sectional explanatory views in the length direction of a rod-shaped object having a convex portion, where (A) is based on the prior art and (B) is intended by the present invention.

FIG. 2 is a cross-sectional explanatory view in the length direction of a rod-shaped material having a convex portion obtained by the present invention.

FIG. 3 is a partial cross-sectional explanatory view of a continuous manufacturing apparatus used for implementing the present invention.

FIG. 4 is a partial cross-sectional explanatory view of another continuous manufacturing apparatus used for implementing the present invention.

5 is a partial cross-sectional view of the inside of a coating unit main body used in the apparatus shown in FIG.

FIG. 6 is a cross-sectional explanatory view of an ironing device.

FIG. 7 is a perspective view of an ironing device.

[Explanation of symbols]

 1,20 String-like material 2 Liquid resin cured material 3 Interface between string-like material and pultrusion molding 4 Pulsation molding 5 Pultrusion molding die 6,21 Bobbin 7 Rotating disk 8,22 Nozzle 9 Spiral roll molding 10,24 Coating section main body 11, 18, 27, 28, 31, 37 Conduit 12 Spiral wound coating molded article 13 Rubber spatula 14 Receiver 15 Curing cylinder 16 Rod-like material 17 Undercoat section 19 Undercoat molded article 23 Undercoat spiral wound molded article 25, 26 Coating Attached roller 29,30 Flow rate controller 32 Resin liquid tank 33 Spiral roll coating molded product 34 Liquid resin 35 Rubber film 36 Rubber film fixing plate 38 Ironing coating device schematic diagram

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area B29L 31:10

Claims (3)

[Claims] 1. A step (1) of making a pultruded article comprising a thermosetting resin and long fibers, a step (2) of spirally winding a string-like object around the pultruded article obtained, and then the surface thereof. A method for continuously manufacturing a rod-shaped article having a convex portion, which comprises sequentially performing a step (3) of applying a liquid resin and a step (4) of curing the applied liquid resin. 2. A step (5) of undercoating a liquid resin is interposed between the step (1) of making a pultruded product and the step (2) of spirally winding a string-like material. Item 2. A continuous manufacturing method for a rod-shaped material having a convex portion according to item 1. 3. A coating step (3) or a coating step (3)
And the liquid resin used in the undercoating step (5) is a bisphenol A polyester, a vinyl ester resin, or an epoxy resin, The method for continuously manufacturing a rod-shaped article having a convex portion according to claim 1 or 2.