JP5437603B2 - Manufacturing method of fiber reinforced composite resin linear material - Google Patents

Description

The present invention relates to a method for producing a fiber-reinforced composite resin linear product. More specifically, the present invention relates to a method for producing a spiral or ring-shaped fiber-reinforced composite resin linear material used as a core material for maintaining the shape of a large duct (wind pipe or vent pipe).

  At present, synthetic fibers can be improved in physical properties such as mechanical strength and heat resistance by compounding fiber materials with various synthetic resins, and therefore, their uses are further expanding.

  For example, the applicant of the present application previously described a long-fiber-shaped reinforcing fiber, an uncured thermosetting resin impregnated in the reinforcing fiber, and a solidified thermoplastic coating the outer periphery of the thermosetting resin. An intermediate of a long fiber-reinforced synthetic resin wire used as a cable armor wire, a strand of FRP rope, etc., comprising a resin coating and subsequently curing the thermosetting resin. (Patent Document 1).

  In addition, the applicants knitted an intermediate of a synthetic resin linear material in a state where the outer periphery of a long fiber impregnated with an uncured thermosetting resin is coated with a solidified thermoplastic resin, and then ligated ( In other words, it proposes a reticulated body that has been heat-cured, and further proposes that the reticulated body be fastened and used as a ginger (Patent Document 2).

  Further, the applicants made a mesh body having an arbitrary scale using the same intermediate as described above, and further formed a heat-cured mesh body into a multi-faceted three-dimensional shape. Has been proposed (Patent Document 3). Thus, the linear object or rod made of fiber reinforced synthetic resin is widely used for applications that require high rigidity, flexibility and light weight.

  Here, in tunnel construction, a dust collection duct having a large diameter (for example, φ1,500 mm or more) for sucking and discharging dust (or dust) generated at a construction site is used. A large-sized duct represented by such a duct for collecting dust is generally a cloth material that constitutes an outer cylinder portion and a core material for supporting the inner wall surface of the cloth material to maintain the shape of the duct. It is comprised from the member of.

Currently, hard steel wire is widely used as the core material. For example, assuming a dust collecting duct 100 m with a diameter of 1500 mm in which hard steel wire type B ring-shaped core materials are arranged at intervals of 10 cm, the ring-shaped core materials are φ8.0 mm · 510 pieces, φ10 mm · 510 pieces. A total of 1,020 are used. Since the weight of one ring-shaped core material is 1.87 kg at φ8.0 mm and 2.9 kg at φ10 mm, the total weight of the ring-shaped core material reaches 2,433 kg. In addition, the total weight per 100 m of the dust collecting duct reaches 8,700 kg if the weights of the cloth material and other materials are combined. Thus, the total weight of the large (large-diameter) housing is large, and the weight ratio of the core to the total weight is high.
Japanese Patent No. 2772795. Japanese Patent Application Laid-Open No. 2005-237247. Japanese Patent Application Laid-Open No. 2003-184048.

  When a large-diameter duct such as a dust collection duct, especially a large-diameter duct with a diameter of 1,500 mm or more, is used when the weight increases due to the use of a hard steel wire as the core material, the influence of the weight of the core material This causes the core material to bend in the vertical direction, causing a phenomenon that the duct diameter becomes an ellipse and the suction performance is reduced. In addition, if the total weight of the duct increases, the work involved in the transportation and installation of the duct at the site becomes heavy labor, and the power energy when the duct is expanded and contracted and hung in the scene of production, transportation, installation, etc. also increases. There was also a problem. In addition, when the core material is formed of a hard steel wire as in the prior art, there is a problem that material deterioration due to corrosion and cloth stains due to rust also occur.

  Therefore, in order to solve the above-mentioned problems, the main object of the present invention is to provide a fiber-reinforced composite resin linear material suitable for a duct core material that is lightweight and excellent in durability.

The method for producing a fiber-reinforced composite resin linear material according to the present invention includes an impregnation step of impregnating long fibers with an uncured thermosetting resin containing a thickener and a penetrating thickener, and the impregnation is performed. After the outer periphery of the long fiber is coated with a molten thermoplastic resin, a step of obtaining a linear product intermediate by cooling and solidifying, a step of curing the linear product intermediate , and the linear product intermediate in a state wound around the cylindrical mold having a predetermined diameter, the thermosetting treatment and facilities for internal uncured thermosetting resin of the linear material intermediate to obtain a spiral or annular linear was heated And at least a step .
Since the linear product obtained by the method for producing a fiber-reinforced composite resin linear product of the present invention is lighter than conventional hard steel wires, it is useful as a core material for a larger-diameter duct, and is corrosive. Therefore, it is suitable as a core material for dust collection ducts used in outdoor construction such as tunnel construction. Furthermore, in the present linear object, by adding a thickener and a penetrating thickener to the uncured thermosetting resin, it is possible to effectively prevent so-called dripping from the end surface of the linear object. By increasing the viscosity, the degree of deformation of the cross-sectional shape can be suppressed when it is wound around an arbitrary mold.
The “thickener” is an additive that functions to increase the viscosity of the uncured thermosetting resin, and the “penetration thickener” is a thickener for the thermosetting resin. It is an additive that exhibits the function of enhancing the penetration effect .
In the method for producing a fiber-reinforced composite resin linear product of the present invention, the thickener is used with respect to 100 parts by weight of the total amount of the uncured thermosetting resin and the penetrating thickener: 5 to 50 parts by weight. In an amount of 0.5 to 50 parts by weight.
The diameter of the cylindrical mold may be 1500 mm or more.
And the manufacturing method of the fiber reinforced composite resin linear article of this invention can obtain the fiber reinforced composite resin linear article with a circular cross section.

By using the fiber reinforced composite resin linear material manufactured according to the present invention as a core material of a duct, the weight of the duct is significantly reduced and the cost is significantly reduced as compared with the conventionally popular hard steel wire core material. It can be achieved, and the problem of deterioration due to corrosion of the core portion can be solved at once. Moreover, since the fiber reinforced composite resin linear material manufactured by this invention is lightweight, the work effort concerning manufacture, conveyance, installation, etc. of a duct can be reduced. Furthermore, the hard steel wire core material, for example, is plastically deformed when dropped from a height of 4 m and cannot be used after dropping, but the fiber-reinforced composite resin wire produced according to the present invention was used. The duct is only accompanied by a temporary elastic deformation, and there is no hindrance to use after dropping.

  Hereinafter, preferred embodiments of the fiber-reinforced composite resin linear material according to the present invention will be described. Note that the attached drawings show an example of embodiments according to the present invention, and the scope of the present invention is not construed narrowly.

First, FIG. 1 is a fiber-reinforced composite resin linear material according to the present onset Ming (hereinafter, abbreviated as "linear object".) Is a sectional view showing the internal structure of FIG. 2, the spiral The figure which shows the mode of the formed linear object example, FIG. 3 is a figure which shows the linear object example formed in ring shape.

  A linear object 1 shown in FIG. 1 is a linear object used as a core material for holding a cylindrical shape of a duct (hereinafter, described as a cylindrical shape). The core material is fixed to a cloth material or the like constituting the outer cylinder portion of the duct using an adhesive tape or the like.

  The linear object 1 includes a long fiber 11 that gives rigidity to the linear object 1, an uncured thermosetting resin 12 that is impregnated in the long fiber, and an outer periphery of the uncured thermosetting resin 12. It is obtained by subjecting a linear product intermediate composed of a thermoplastic resin 13 provided so as to cover the film to a thermosetting treatment.

  More specifically, the linear object 1 provided as a core product for a duct includes, for example, an impregnation step in which the uncured thermosetting resin 12 is impregnated with the long fibers 11 and the long fibers 11 in the impregnated state. The outer periphery of the resin is coated with a molten thermoplastic resin 13 and then cooled and solidified to obtain a linear product intermediate, and the uncured thermosetting resin 12 inside the linear product intermediate. It can be obtained by performing at least a heating step for performing a thermosetting treatment. More preferably, a step of adding a thickener and a penetration thickener to the uncured thermosetting resin 12 may be performed before the impregnation step (described later).

  In the present invention, in order to use the linear object 1 as a core material that maintains the cylindrical shape of the duct, the heating step is performed in a state where the linear object intermediate is wound around a cylindrical mold having a predetermined diameter. Thus, a linear object 1a having a spiral shape (see FIG. 2) or a linear object 1b having a ring shape (see FIG. 3) is obtained.

  More preferably, after curing the linear product intermediate for several days to thicken the uncured thermosetting resin 12, the linear product intermediate is heated in a state of being wound around a cylindrical mold. It is desirable to carry out the process. If a heating process is employ | adopted by such a method, it can prevent effectively that an unhardened linear intermediate body will flatten by winding tension | tensile_strength.

  Further, since the uncured linear product intermediate body is configured so that the outer periphery thereof is covered with a thermoplastic resin, the linear product intermediate body is adjacent even if the linear product intermediate body is continuously wound around a cylindrical mold. Further, the linear intermediate members are not bonded to each other, and further, the releasability from the cylindrical mold is good. If the outer periphery is not covered with a thermoplastic resin, the uncured thermosetting resins of adjacent linear intermediates are cured in a state where they are adhered to each other until the heat curing is completed. Therefore, for example, it is difficult to obtain a spiral linear object that can expand and contract like a coil.

  Here, about the kind of long fiber 11 (refer FIG. 1) which comprises the linear thing 1, it does not specifically limit, Synthetic resin fibers, such as polyolefin fiber and polyester fiber, Inorganic fibers, such as glass fiber, Metal fiber, etc. Although it can be used, it is preferably an inorganic fiber, and more preferably a long glass fiber.

  Further, the thickness of the long fiber 11 is not particularly limited, and can be appropriately selected in consideration of the purpose of use and ease of processing. Further, the number of fibers bundled is not particularly limited, and can be freely selected in consideration of the purpose of use and desired physical properties.

  Next, the uncured thermosetting resin 12 may be a synthetic resin having a property of being cured by heating, and the type of the uncured thermosetting resin 12 is not particularly limited, but is preferably an unsaturated polyester excellent in performance stability after curing. Resin, unsaturated alkyd resin, epoxy resin, etc. are desirable, more preferably containing a crosslinkable substance, more preferably at least one of unsaturated polyester resin, unsaturated alkyd resin, or epoxy acrylate. It is desirable to contain a crosslinkable substance such as a crosslinkable monomer and a polymerization initiator such as diacyl peroxide. By adopting such a blend, the polymerization reaction can be advanced by heat or the like during the heating step, and the crosslinking can be further advanced.

  Here, in the stage of the heating step, since the thermosetting resin 12 is in an uncured state, the resin 12 oozes out from the end surface (for example, the cut surface) of the linear object 1. A phenomenon can occur. When this sag phenomenon occurs, it becomes sticky and adversely affects the processing work, or heat curing becomes insufficient, and the stability over time of physical properties is adversely affected. Therefore, when this linear product 1 is manufactured, the thickening of the uncured thermosetting resin 12 is increased by adding the thickener and the penetration thickener to the uncured thermosetting resin 12. After that, it is desirable to shift to the above impregnation step.

  The type of “thickening agent” is not particularly limited, but preferably includes a resin having a monomer unit of at least one of an acrylic ester compound, a methacrylic ester compound, and a vinyl compound. .

  The acrylic ester compound used for the thickener refers to a compound having an acrylic ester structure and derivatives thereof, such as methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate. , Sec-butyl acrylate, t-butyl acrylate, n-hexyl acrylate, cyclohexyl acrylate and the like.

  The methacrylic acid ester compound used for the thickener means a compound having a methacrylic acid ester structure and a derivative thereof, for example, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, n-hexyl. Examples include methacrylate and cyclohexyl methacrylate.

  The vinyl compound used for the thickener refers to a compound having a polymerizable vinyl structure, such as styrene, α-methylstyrene, divinylbenzene, and various functional groups such as an alkyl group and a halogen atom in these aromatic rings. And a compound substituted with.

  Further, the thickener may be a polymer composed of one type or a plurality of types of polymerization units of a methacrylic acid ester compound, an acrylate ester compound, and a vinyl compound, and a plurality of types of resins having different structures are mixed. Resin may be used. Furthermore, (1) a polymer comprising at least one of an acrylate ester compound, a methacrylic ester compound or a diene compound, and (2) a radical polymerizable unsaturated compound with an acrylate ester compound or a methacrylic ester compound. (3) A composite resin that is ion-crosslinked by adding metal ions to a polymer composed of a carboxylic acid.

  And a powder resin can be used for a thickener. The particle size and the like of the powder resin used as the thickening agent are not particularly limited, but preferably 0.5 μm to 2.0 μm.

  In the process of manufacturing the linear object 1 according to the present invention, when the heating process is performed on the linear object intermediate, the uncured thermosetting resin 12 has a high viscosity and may not be gelled. desirable. This is because the physical properties of the uncured curable resin 12 easily change as time passes.

  Next, the type of “penetration thickener” is not particularly limited, but it is preferable to use benzyl methacrylate. As the uncured thermosetting resin 12, a thermosetting resin such as unsaturated polyester is used. In order to enhance the penetration effect of the thickener into the thermosetting resin, a penetration thickener is blended. In particular, benzyl methacrylate is suitable because it has a high penetrating effect on a thermosetting resin such as unsaturated polyester.

  By adding the penetrating thickener, the thickener can penetrate well into the uncured thermosetting resin 12 and can be mixed uniformly. That is, excessive thickening due to poor dispersion of the thickening agent can be suppressed, a desired thickening speed can be achieved, and a dripping phenomenon can be prevented. In this way, by using not only a thickener but also a penetration thickener, not only can the dripping phenomenon be prevented, but the thickening effect improves the cross-sectional shape retention performance and suppresses deformation during processing. Moreover, the linear object 1 suitable for practical use can be obtained.

  The blending amount of the thickener and the penetration thickener is not particularly limited, but preferably the following blending amount is desirable. It is desirable to contain 0.5 to 50 parts by weight of the thickener with respect to 100 parts by weight of the total amount of the uncured thermosetting resin 12 and 5 to 50 parts by weight of the penetration thickener. Thereby, the suppression effect and the thickening effect of the liquid dripping amount of the uncured thermosetting resin 12 can be further improved.

  Note that if the amount of penetrating thickener added is too large, the resin thickening rate will become too fast, for example, the binder component contained in the long fibers will dissolve into the impregnated resin due to the influence of the penetrating thickener. However, the thickening may be promoted excessively. In this case, the thickening speed can be adjusted by reducing the amount of the penetrating thickener added or by reducing the amount of the thickener added.

  Next, the thermoplastic resin 13 constituting the outer periphery of the linear object 1 also plays a role of imparting properties such as weather resistance and chemical resistance to the linear object 1. The type of the thermoplastic resin 13 is not particularly limited, but is preferably a substance having excellent flexibility, and a polyolefin resin or the like can be preferably used. In addition, when the uncured thermosetting resin 12 contains a crosslinkable substance, it is desirable to employ a thermoplastic resin having a property that is not easily eroded by the crosslinkable substance, and more preferably, it is difficult to wear. You may make it improve durability further by using the thermoplastic resin of a property. In the present invention, the combination of the long fibers 11, the uncured thermoplastic resin 12, and the thermoplastic resin 13 is not particularly limited.

  Here, FIG. 4 is a diagram showing a state of a duct 2a in which a spiral linear object 1a, which is one of representative examples of the linear object 1 according to the present invention, is used as a core material, and FIG. It is a figure which shows the state of the duct 2b by which the ring-shaped linear object 1b which is another typical example of the linear object 1 is arrange | positioned as a core material at predetermined intervals.

  First, in the duct 2a supported by the spiral core material and the duct 2b supported by the ring-shaped core material, the linear objects 1a and 1b having the above resin structure are used as the core materials, respectively. Thus, compared with the hard steel wire core material that has been generally used in the past, it is possible to significantly reduce the total weight of the duct and reduce the cost.

  In particular, when adopting a spiral core material (see FIG. 2) for the duct, the total weight of the core material is increased compared to the ring-shaped core material, and the productivity of the duct is further reduced. If the light spiral wire 1a is used instead of the hard steel wire as the core material, the total weight of the duct can be significantly reduced, which contributes to the improvement of the duct productivity.

  In addition, the ducts 2a and 2b in which the core materials 1a and 1b formed of resin are respectively employed do not cause a problem of material deterioration due to corrosion of the core material portion, and the cloth material in contact with the core material is the core material. The problem of contamination by rust can also be solved, and as a result, the useful life of the duct can be extended.

  Further, since the weights of the ducts 2a and 2b are reduced, the I-type steel used to support the duct 2a or the duct 2b at the time of duct manufacture or field installation, or these ducts 2a and 2b. There is also an advantage that the power equipment used when expanding and contracting can be reduced in size.

  Although the core material of the duct is required to have rigidity, the linear object 1 according to the present invention can provide a material having a tensile strength equal to or higher than that of a hard steel wire while being lightweight. High rigidity comparable to that of the wire can be stably maintained for a long time.

  By using the linear object 1 whose specific gravity is smaller than a hard steel wire as a core material, a high dust collection effect can be obtained. More specifically, when a hard steel wire having the same rigidity but a large specific gravity is used as the core material, the duct 2 is bent due to the weight of the core material, and the duct cross-section is circular to elliptical. Will be deformed. This deformation causes a problem that the wind flow is bent or turbulent and the dust collection effect is reduced. However, when the linear object 1 according to the present invention having a small specific gravity is used for the core material, such a problem does not occur because the duct cross-sectional shape is hardly deformed.

  In particular, when a spiral linear object 1a that is a continuous object is employed as a core material, the duct 2a is continuously supported and reinforced in the longitudinal direction, and the shape of the duct 2a is changed. Can hold. That is, it becomes easy to continuously maintain the cylindrical cross-sectional shape (circular shape) of the duct 2a. As a result, it is possible to more reliably prevent the dust collection effect from being reduced, and to eliminate problems such as bending or buckling of the duct during expansion and contraction. “Extension / contraction” means contraction or extension like a coil.

  In order to verify the effects of the present invention, the ducts of Examples 1 to 3 and the ducts of Comparative Examples 1 and 2 were produced and evaluated.

<Example 1>
Polymethylmethacrylate resin powder (manufactured by Nippon Zeon Co., Ltd., trade name “Zefiac F320”, particle diameter 1 μm) as a thickener and methacrylic acid as a penetrating thickener on 44,000 dtex / glass fiber 40 After impregnating an unsaturated polyester resin containing benzyl (Nippon Iupika Co., Ltd., trade name “Yupika 9001”), it is coated with a polyethylene-based thermoplastic resin (Nippon Unicar Corporation, trade name “NUCG5350”). A linear product intermediate was obtained. Note that the outer diameter of the linear intermediate was 15 mm.

  In Example 1, after the above-mentioned linear intermediate was thickened, it was continuously wound around a cylindrical mold having an outer diameter of 1,500 mm and cured by heating with dry heat at 98 ° C. for 24 hours. The obtained fiber-reinforced composite resin linear material was cut at a position where the inner diameter was 1,500 mm. Then, the coated thermoplastic resin having a length of 50 mm was peeled from both ends, and connected with an aluminum pipe (inner diameter: 15 mm, total length: 100 mm, R750 mm) filled with an epoxy adhesive to form a ring shape. Then, a ring-shaped core material (refer to FIG. 3) is arranged on the inner side of the tarpaulin sheet at a pitch of 100 mm to produce a duct 5 m having an outer diameter of 1,500 mm, and further, this 5 m long duct is joined with a fastener. A dust collecting duct having a total length of 100 m was obtained. The "tarporin sheet" is a sheet obtained by heat-sealing a vinyl chloride or olefin film on a high-strength polyester fabric.

  The total weight of this duct was 2,071 kg. Moreover, when the expansion-contraction test of the duct was implemented, the favorable elasticity was shown and the duct cross section kept circular continuously. Furthermore, when a negative pressure test was conducted, there was no deformation even under the condition of 1.7 kPa, and there was no problem. As a result of increasing the viscosity by adding a thickener to the uncured thermosetting resin, no deformation such as flatness occurs in the linear object due to the tension when winding it around the mold, which is suitable Met. Although the duct was dropped from a height of 4 m, the core material was only accompanied by temporary elastic deformation, and was not plastically deformed.

<Example 2>
A linear product intermediate was obtained in the same manner as in Example 1, and after thickening this, 44 rounds were continuously wound around a mold having an outer diameter of 1,500 mm and dried at 98 ° C. for 24 hours. Heat cured. The obtained spiral wire is used as a core material in two rolls, and is placed inside the tarpaulin sheet at a pitch of 120 mm as a core material to produce a duct 5 m having an outer diameter of 1,500 mm. The duct was joined with a fastener to obtain a dust collecting duct having a total length of 100 m.

  The total weight of this duct was 1,873 kg. Moreover, when the expansion-contraction test was implemented regarding this duct, the favorable stretchability was shown and the duct cross section was maintaining circular continuously. In addition, when a negative pressure test was performed, the deformation did not occur even at 2.0 kPa, and there was no problem. In addition, as a result of adding a thickener to the uncured thermosetting resin to increase the viscosity, no deformation such as flatness has occurred in the linear object due to the tension when wound around the mold. It was preferable. Although the duct was dropped from a height of 4 m, the core material was only accompanied by temporary elastic deformation, and was not plastically deformed.

<Example 3>
A linear product intermediate was obtained in the same manner as in Example 1, and after thickening this, it was continuously wound around a cylindrical mold having an outer diameter of 1,650 mm for 22 turns and dried at 98 ° C. for 24 hours. Heat cured. Using the obtained spiral wire as a core material, two rolls were used as a core material, and a 5 m long duct arranged inside the tarpaulin sheet at a pitch of 120 mm was prepared. Were joined with a fastener to obtain a dust collection duct having a total length of 100 m.

  The total weight of this duct was 1,997 kg. Moreover, when the expansion-contraction test was implemented, the favorable stretchability was shown and the duct cross section was maintaining circular continuously. Moreover, when the negative pressure test was implemented, even if it was 2.0 kPa, there was no deformation | transformation and it was the level which is satisfactory. Furthermore, as a result of adding a thickener to the uncured thermosetting resin to increase the viscosity, deformation such as flattening of the linear object occurs due to the tension when it is wound around the cylindrical mold. It was not suitable. Although the duct was dropped from a height of 4 m, the core material was only accompanied by temporary elastic deformation, and was not plastically deformed.

<Reference example>
After impregnating 40 glass fibers of 44,000 dtex / glass with an unsaturated polyester resin (Nippon Iupika Co., Ltd., trade name “Iupica 9001”) that does not contain a thickener and a penetrating thickener, a polyethylene type The product was coated with a thermoplastic resin (trade name “NUCG5350” manufactured by Nippon Unicar Co., Ltd.) to obtain a linear product intermediate. Note that the outer diameter of the linear intermediate was 15 mm.

In this reference example , the linear intermediate was continuously wound around a cylindrical mold having an outer diameter of 1,500 mm, and was cured by heat and dry heat at 98 ° C. for 24 hours. The obtained fiber-reinforced composite resin linear material was cut at a position where the inner diameter was 1,500 mm. Then, the coated thermoplastic resin having a length of 50 mm is peeled off from both ends and connected using an aluminum pipe (inner diameter 15 mm, total length 100 mm, R750 mm) filled with an epoxy adhesive, and a ring-shaped core material did. In this case, there was a tendency that the linear object intermediate was flattened by the winding tension around the cylindrical mold .

<Comparative Example 1>
Using a hard steel wire type B with a diameter of 1,500 mm in the form of a ring with a diameter of 1,500 mm as a core material, a duct with a length of 5 m is produced with a tarpaulin sheet, and this duct is joined with a fastener. Thus, a dust collection duct having a length of 50 m was obtained. Next, a hard steel wire type B having a diameter of 10 mm was used to obtain a ring-shaped core material having a diameter of 1,500 mm, and a duct having a length of 50 m was obtained. These two types of 50 m long ducts were connected to obtain a dust collecting duct having a total length of 100 m.

  The total weight of this duct was 3,333 kg. In addition, when the expansion-contraction test was implemented, the favorable elastic property was shown, but the duct cross section was bent by the dead weight of the core material, and became elliptical. When dropped from a height of 4 m, the core material was plastically deformed and could not be used.

<Comparative example 2>
Using a hard steel wire type B with a diameter of 1,650 mm in a ring shape with a diameter of 1,650 mm as a core material, arrange it at a pitch of 100 mm, and make a duct with a length of 5 m with a tarpaulin sheet. To obtain a dust collection duct having a length of 50 m. Next, a hard steel wire type B having a diameter of 10 mm and a ring shape having a diameter of 1,650 mm is used as a core material, and is placed inside a tarpaulin sheet at a pitch of 100 mm to produce a duct having a length of 5 m. The long duct was joined with a fastener to obtain a dust collection duct having a length of 50 m. The two types of ducts having a length of 50 m were connected to obtain a dust collecting duct having a total length of 100 m.

  The total weight of this duct was 3,547 kg. Moreover, when the expansion-contraction test was implemented, the favorable elastic property was shown, However, The duct cross section bent by the dead weight of the core material, and became elliptical. When dropped from a height of 4 m, the core material was plastically deformed and could not be used.

  From the above, by using the fiber reinforced composite resin linear material according to the present invention as the core material for the duct, a significant weight reduction of the duct can be achieved. Moreover, since the specific gravity of the linear object is smaller than that of a hard steel wire that has been conventionally used as a core material in general, there is no concern about the occurrence of duct-shaped bending deformation due to the weight of the core material. In addition, it is possible to provide a duct having a diameter of 1,500 mm or more, which has been verified in the embodiment, with peace of mind.

  Since the fiber-reinforced composite resin linear material according to the present invention is made of resin, there is also an advantage that it can be easily molded into a desired shape, for example, a spiral shape or a ring shape. In addition, if the same wire is used as the core material for large-diameter ducts, it will greatly contribute to reducing the total weight of the duct and reducing costs, while improving duct productivity and improving labor productivity during transportation or installation. Contributes to improvement, downsizing of peripheral equipment handling ducts, and reduction of power energy. In addition, because the weight of the core material makes it difficult for the duct to deform due to the weight of the core material, even if the duct has a large diameter, a smooth suction air flow is created in the duct to achieve the desired dust collection effect. It can be demonstrated.

  The fiber reinforced composite resin linear object according to the present invention can be used as a core material for maintaining the shape of the duct. In particular, since the weight reduction effect is remarkable, it can be used as a core material for a large-sized (large-diameter) duct.

It is sectional drawing which shows the internal structure of the fiber reinforced composite resin linear material (1) which concerns on this invention. It is a figure which shows the mode of the example of 1 form of the same linear object (1a) formed in the spiral form. It is a figure which shows one example of the same linear object (1b) formed in the ring shape. It is a figure which shows the state of the duct (2a) in which the spiral linear object (1a) which is a representative example of the linear object (1) based on this invention was used as a core material. It is a figure which shows the state of the duct (2b) by which the ring-shaped linear object (1b) which is another representative example of the same linear object 1 is arrange | positioned as a core material at predetermined intervals.

Explanation of symbols

1 Fiber reinforced composite resin linear (abbreviation, linear)
1a Spiral wire (core material)
1b Ring-shaped wire (core material)
2a, 2b Duct 11 Long fiber 12 Uncured thermosetting resin 13 Thermoplastic resin

Claims (4)

An impregnation step of impregnating long fibers with an uncured thermosetting resin containing a thickener and a penetrating thickener ;
A step of obtaining a linear intermediate by coating the outer periphery of the impregnated long fiber with a molten thermoplastic resin, followed by cooling and solidification;
Curing the linear intermediate; and
The linear material intermediate state wound around the cylindrical mold having a predetermined diameter, the thermosetting treatment and facilities for internal uncured thermosetting resin of the linear material intermediate, spiral or ring-shaped A heating step to obtain a linear object ;
A method for producing a fiber-reinforced composite resin linear material, at least. 0.5 to 50 parts by weight of the thickener is blended with respect to 100 parts by weight of the total amount of the uncured thermosetting resin and the penetrating thickener: 5 to 50 parts by weight. The manufacturing method of the fiber reinforced composite resin linear object of Claim 1. The diameter of the said cylindrical metal mold is 1500 mm or more, The manufacturing method of the fiber reinforced composite resin linear object of Claim 1 or 2 characterized by the above-mentioned. The method for producing a fiber-reinforced composite resin linear product according to any one of claims 1 to 3, wherein a fiber-reinforced composite resin linear product having a circular cross section is obtained.

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