JP2983712B2 - Method for manufacturing composite elongated body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for reinforcing a composite elongated body subjected to an external force or an internal pressure, such as a submarine cable or a flexible composite pipe for fluid transport, with a cross section formed on the elongated core. The present invention relates to an improvement in a method for manufacturing a composite elongated body in which a linear body having a rectangular shape (including a square shape) is spirally wound to form a reinforcing layer.

[0002]

2. Description of the Related Art Composite elongated bodies, such as submarine cables and flexible composite tubes for fluid transport, are subject to tension, trauma, and flexible composite tubes for fluid transport are subject to additional internal pressure. When manufacturing this composite elongated body, a linear body such as a metal or fiber-reinforced plastic strip is wound around the elongated body core to form a reinforcing layer in order to reinforce the composite elongated body. . For this linear body, a linear body having a rectangular cross-sectional shape may be used for the purpose of making the outer diameter of the long body compact and abrasion resistance.

[0003] In the prior art, these linear bodies are once processed into a linear shape, molded, and spirally wound around a long body core to be wound to form a reinforcing layer. .
It has also been considered that the linear body is formed into a spiral shape in advance so that the outer diameter of the elongated body core becomes the winding diameter, and the reinforcing layer is formed by winding the linear body around the elongated body core.

[0004]

However, in the former prior art, the wire cannot be sufficiently formed into a spiral shape in the process of winding the wire, so that the wire is wound after the wire is wound. Acts so as to return to a linear shape, and the linear body may float from the elongated core, or the linear bodies may ride on each other. This tendency is particularly remarkable when the linear body is made of fiber-reinforced plastic or high-strength steel. Therefore,
A composite elongated body in which such a linear body is wound around the elongated body core to form a reinforcing layer cannot exhibit sufficient characteristics due to the phenomenon that the balance of tension is lost, so that the Was destroyed.

[0005] In the latter conventional technique, it is necessary to process the linear body into a spiral shape and then wind it once around a bobbin or the like in order to manufacture a long length. At this time, the spiral shape of the linear body may be lost. In addition, if the bending diameter is increased so that the spiral shape does not collapse, the winding amount on the bobbin etc. decreases, causing a decrease in manufacturing efficiency, and furthermore, the processing of forming the spiral linear body itself is quite advanced technology Is required.

SUMMARY OF THE INVENTION It is an object of the present invention to avoid the above drawbacks and to form a solid reinforcing layer by securely winding the linear body around the linear body without floating. An object of the present invention is to efficiently manufacture a composite elongated body.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a composite elongate in which a linear body having a rectangular cross section is spirally wound around an elongate core to form a reinforcing layer. In the method of manufacturing the body, the linear body is rotated about the center axis thereof in advance in the same direction as the winding direction around the elongated body core at substantially the same pitch, and twist-formed,
Thereafter, a configuration is provided in which it is wound around the elongated body core.

[0008]

In this manner, the linear body having a rectangular cross-sectional shape, which is the wound object, is rotated in advance in the same direction as the winding direction around the elongated core at substantially the same pitch, with the center axis as the center, and the twisting is performed. By forming it and winding it around the elongate body core, which is the object to be wound, the surface of the linear body constantly and uniformly contacts the elongate body core, which is the object to be wound, without difficulty. The body is wound in close contact with the elongated body core.

Therefore, since the linear body does not float, the linear body reliably functions as a reinforcing body, and a solid reinforcing layer can be formed. In addition, since the twist-formed linear body is straight, it is not bulky and can be wound easily and in large quantities on a bobbin or the like, and this is wound around a long body core to form a long composite long body. It can be manufactured efficiently.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a part of the steps of the method for producing a composite elongated body according to the present invention. Based on FIG. 1, the composite elongated body such as a submarine cable or a flexible composite pipe for fluid transportation is reinforced. A method of twist-forming a linear body to be wound around the elongated core in advance will be specifically described.

That is, in order to twist-form the linear body 10, first, a large number of reinforcing fibers 14 fed from a large number of bobbins 12 are gathered by a pressing roller 16, and these are bundled to form a predetermined rectangular cross-sectional shape. , A reinforcing fiber bundle 18. Next, the reinforcing fiber bundle 18 is passed through a resin impregnation tank 22 filled with a resin 20 to impregnate the resin. The reinforcing fiber bundle 18a is used.

Next, the resin-impregnated reinforcing fiber bundle 18a is passed at a constant linear velocity into a molding die 26 having a predetermined rectangular molding hole. On the other hand, the mold 26 is rotated by a motor 27 at a constant rotation speed around the central axis of the reinforcing fiber bundle 18a. The rotation direction and rotation speed of the mold 26 are
The rotation speed is set to be the same as the direction in which the linear body 10 is wound around the elongated body core and to have substantially the same pitch. Thereby, the reinforcing fiber bundle 18a can be formed by imparting a twist having substantially the same pitch in the winding direction around the elongated core. Further, since the molding die 26 is heated, the resin-impregnated reinforcing fiber bundle 18a passes through the heated die 26 so that the surface thereof has a constant pitch around the central axis of the reinforcing fiber bundle 18a. The twisting is performed so as to rotate, and the resin is solidified by heating, so that the twisting shape is maintained. After the wire body 10 has been subjected to a predetermined twisting process in advance, the wire body 10 is wound around a bobbin 28 that rotates at the same speed and in the same direction as the mold 26.

In order to keep the running speed (linear speed) of the linear body 10 constant, the linear body 10 is rotationally driven between the mold 26 and the bobbin 28 in the same direction and at the same speed as the mold 26. Preferably, a take-off machine (not shown) is provided.

As the reinforcing fiber 14, glass fiber, aramid fiber or carbon fiber is generally used, but boron fiber or metal fiber may be used. The resin is generally an epoxy resin which is a thermosetting resin, but a thermoplastic resin such as polyethylene or polyamide resin may be used, and at this time, the mold 26 is cooled.

Next, a method of winding the linear body 10 around the elongated core 34 will be described with reference to FIG. That is, as described above, after the twisting of the linear body 10 is performed in advance, the plurality of bobbins 28 wound around the linear body 10 are mounted on the cage 32 of the twisting machine 30, and the elongated body core 34 as the object to be wound is provided. Is wound out from the feeding bobbin 36, and the plurality of linear bodies 10 fed out from the plurality of bobbins 28 mounted on the cage 32 are wrapped (twisted) around the elongated core 34 with a twisting cap 38 to reinforce the wire. A layer is formed, and an outer layer such as a plastic sheath is applied as necessary, to produce a composite elongated body 40 such as a submarine cable or a flexible composite pipe for fluid transport.

A specific example of the present invention will be described.
A glass fiber reinforced plastic bundle (linear body) having a rectangular cross section of 10 mm in width and 5 mm in thickness is twist-formed in advance so that the surface rotates once in the same direction as the winding direction at a pitch of 620 mm, and a bobbin having an outer diameter of 1000 mm. 28. Next, the plurality of bobbins 28 are mounted on a twisting machine 30 as shown in FIG.
Winding angle about 3mm on 20mm plastic pipe (long body)
Wound at 0 °. The linear body having a rectangular cross-sectional shape formed by twisting in this manner did not float or run up, and was well adapted to a plastic pipe.

On the other hand, as a comparative example, a glass fiber reinforced plastic (linear body) having a rectangular cross section of 10 mm width and 5 mm thickness was wound around a plastic pipe having an outer diameter of 120 mm at a winding angle of about 30 ° without twisting. Was. In this case, if the front end of the glass fiber reinforced plastic is bound at the time of winding, and if the rear end after the winding is not bound, it is confirmed that the glass fiber reinforced plastic is loosened, the adaptability is poor, and it cannot be used for practical use. .

Further, a fiber reinforced plastic (linear body) having a rectangular cross-sectional shape having a width of 10 mm and a thickness of 5 mm is added to a sheet having a pitch of 62 mm.
When the product formed by twisting so as to make one rotation at 0 mm was wound around a bobbin 28 having a winding diameter of 1000 mm and a winding width of 800 mm, it was confirmed that it could be wound over 2000 m or more.

As a comparative example, a fiber-reinforced plastic having a rectangular cross-section of 10 mm in width and 5 mm in thickness was used.
Formed into a spiral with a pitch of about 600 mm
When wound around a bobbin 28 of 000 mm and a winding width of 800 mm, only about 300 m could be wound.

In the embodiment of the present invention, a fiber-reinforced plastic material is exemplified as a linear material. However, the same applies to a hard and brittle linear material such as a high-strength steel having an increased amount of carbon or the like. Results have been obtained and the present invention is also useful for these metallic materials. Further, depending on the use condition of the composite elongated body, the material forming the reinforcing layer may be one.

[0021]

According to the present invention, as described above, a linear body having a rectangular cross-sectional shape, which is a wound object, is set in advance in the same direction as the winding direction around the center axis about its central axis. It is rotated at approximately the same pitch, twist-formed, and then wrapped around the long core, which is the object to be wound, to form a reinforcing layer. The linear body does not come into contact with the attachment without difficulty, and the linear body is not lifted up, can be securely wound as a reinforcing layer, and a solid reinforcing layer can be formed. Furthermore, since this linear body keeps a linear shape even when twisted, it can be wound around a bobbin easily and in large quantities, so that the number of connecting steps can be reduced, and a long composite long body can be efficiently manufactured. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method of forming a linear body used in the present invention.

FIG. 2 is an explanatory view showing a method of winding a long core of the linear body.

[Explanation of symbols]

 Reference Signs List 10 linear body 18a resin-impregnated reinforced fiber bundle 26 molding die 34 elongated core 40 composite elongated body

Claims (1)

(57) [Claims] 1. A method for manufacturing a composite elongated body in which a reinforcing layer is formed by spirally winding a linear body having a rectangular cross section around an elongated core, wherein the linear body is previously centered on its central axis. As a method of manufacturing a composite elongate body, it is rotated at substantially the same pitch in the same direction as the winding direction around the elongate body core, twist-formed, and then wound around the elongate body core. Method.