JP4346144B2 - Belt-like sheet body and manufacturing apparatus thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a belt-like sheet body used for a fluid inflow pipe capable of reducing a frictional resistance generated on an inner wall while allowing a fluid such as flammable gas or water to flow therein, and a manufacturing apparatus therefor.
[0002]
[Prior art]
In order to reduce fuel consumption of aircraft, attempts to reduce the frictional resistance between the fluid and the airframe surface through which the fluid flows have been studied, and the frictional resistance is reduced by attaching uneven grooves called riblets to the airframe surface. It has been reported. Furthermore, examples of applying riblets to the inner wall of a pipe that flows fluid have been reported, but all are laboratory-level research reports, the pipe diameter is small, and various riblet shapes are formed directly on the inner wall of the pipe. .
[0003]
[Problems to be solved by the invention]
In these tubes, a riblet shape is formed in a portion corresponding to the inner wall of the material, and then the material is processed into a tubular shape. There are significant restrictions on the material, size, and the like. In addition, the production of the tube requires time and cost.
[0004]
The present invention has been made in consideration of the above points, and provides a belt-like sheet body used in manufacturing a fluid inflow pipe capable of reducing frictional resistance generated on an inner wall and a manufacturing apparatus therefor. Objective.
[0005]
[Means for Solving the Problems]
The present invention relates to a belt-like sheet body fixed to the inner surface of a pipe body into which a fluid flows, and the belt-like base material and the surface of the belt-like base material are linearly inclined at a predetermined angle with respect to the longitudinal direction of the base material. A plurality of extending convex portions are formed, and the predetermined angle θ of the convex portion is determined by θ ₀ −10 ° ≦ θ ≦ θ ₀ + 10 °, the inner peripheral length of the tube main body is L, and the width of the sheet body is d In the manufacturing apparatus of the belt-like sheet body characterized in that cos θ ₀ = d / L and the belt-like sheet body fixed to the inner surface of the pipe body into which the fluid flows, a sheet for supplying the belt-like base material A sheet body is produced by forming a plurality of convex portions extending linearly with respect to the belt-like base material from the sheet supply portion, and a plurality of grooves that are substantially orthogonal to the axis on the outer periphery of the supply portion. A grooved cylinder and a sheet take-up unit for winding a belt-like sheet body from the grooved cylinder The sheet supply unit and the sheet take-up unit are arranged such that a base material extending from the sheet supply unit to the grooved cylinder is inclined with respect to the grooved cylinder by a predetermined angle with respect to the grooved cylinder. It is the manufacturing apparatus of the strip | belt-shaped sheet body.
[0006]
According to the present invention, the convex portion extending linearly along the fluid inflow direction can be formed in the tube main body simply by winding the belt-like sheet body in a spiral shape in the tube main body.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views showing a belt-like sheet body and a manufacturing apparatus thereof according to the present invention.
[0008]
First, the fluid inlet pipe 10 into which fluid flows will be described with reference to FIGS.
[0009]
As shown in FIGS. 4 to 7, the fluid inflow tube 10 includes a cylindrical tube body 11 into which a fluid such as a combustible gas or a fluid flows, and a sheet body 12 fixed to the inner surface of the tube body 11. The sheet body 12 is curved into a shape that matches the shape of the inner surface of the tube body 11.
[0010]
Among these, the pipe body 11 may be an iron pipe, a copper pipe, a stainless pipe, a vinyl chloride pipe, or the like, but the material is not particularly limited as long as it allows a fluid to flow in.
[0011]
The sheet body 12 includes a base material 34 and a plurality of convex portions (riblet shape) 33 provided on the inner surface side of the base material 34 and extending linearly along the fluid inflow direction. On the side, an adhesive layer 35 for joining the sheet body 12 to the inner surface of the tube body 11 is provided.
[0012]
Among these, the plurality of convex portions 33 have a triangular cross-sectional shape and extend in a straight line parallel to each other along the fluid inflow direction and function to reduce the frictional resistance of the fluid.
[0013]
The sheet body 12 needs to have an appropriate bendability (flexibility) according to the tube diameter of the tube body 11, but on the other hand, it is considered easy to handle when placed on the tube body 11. It is desirable to have a proper stiffness. Generally, the thickness of the sheet body 12 is preferably 50 μm to 1 mm, although it varies depending on the material used.
[0014]
The material of the sheet body 12 is not chemically deteriorated by pressure, temperature change, impact or flowing fluid used in the pipe, and the effect is remarkable due to deformation of the riblet shape 33 or peeling from the pipe body 11. It is necessary to have resistance that does not decrease.
[0015]
Here, as the material of the base material 34, organic materials such as polyethylene terephthalate, polycarbonate, polystyrene, polypropylene, polyethylene, methyl polymethacrylate, polyurethane, polyamide, polyimide, polyvinyl chloride, polymethylpentene, polyvinyl acetal, cellulose triacetate, etc. However, the present invention is not limited to the above, and a material such as a metal foil may be used as long as the material has appropriate flexibility.
[0016]
Further, as a material of the convex portion (riblet shape) 33, for example, an ionizing radiation curable resin can be considered.
[0017]
Further, an adhesive layer may be provided between the convex portion 33 and the base material 34 as necessary to improve the adhesion. As the adhesive layer composition in that case, a resin composition comprising a thermoplastic resin and a reaction curable resin composition is particularly preferably used.
[0018]
Of the above adhesive layer components, those containing thermoplastic resin as the main component include linear polyester, polyurethane, acrylic resin, polyvinyl butyral, polyamide, vinyl chloride / vinyl acetate copolymer, etc. A binder to which a plasticizer or a light stabilizer is added can be used.
[0019]
The binder of the reaction curable resin composition includes polyester polyol / polyisocyanate, polyether polyol / polyisocyanate, polyacryl polyol polyol / polyisocyanate, epoxy polyisocyanate, and ionizing radiation curable resin. It can also be used.
[0020]
As the polyisocyanate, aromatic and / or aliphatic diisocyanates and triisocyanates are widely used.
[0021]
The ionizing radiation curable resin composition constituting the convex portion 33 is a (meth) acrylate of a polyfunctional compound such as a polyhydric alcohol (hereinafter, acrylate and methacrylate are referred to as (meth) acrylate in this specification). .)) And a relatively large amount of a reactive diluent and a reactive diluent. Examples of the diluent include monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, vinyltoluene, N-vinylpyrrolidone, and polyfunctional monomers such as trimethylolpropane tri (meth) acrylate, hexanediol. (Meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6 hexanediol di (meth) acrylate, neo Examples include pentyl glycol di (meth) acrylate.
[0022]
Further, when the ionizing radiation curable resin constituting the convex portion 33 is used as an ultraviolet curable resin, acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime are used as photopolymerization initiators in these. Esters, thioxanthones, and n-butylamine, triethylamine, tri-n-butylphosphine and the like are used as a photosensitizer.
[0023]
The ionizing radiation curable resin may contain the following reactive organosilicon compound.
[0024]
Such a compound is a compound represented by R _m Si (OR ′) _n , wherein R and R ′ represent an alkyl group having 1 to 10 carbon atoms, m + n = 4, and m and n are each an integer. It is. More specifically, tetramethoxysilane, tetraethoxysilane, tetra-iso-propoxysilane, tetra-n-propoxysilane, tetra-n-butoxysilane, tetra-sec-butoxysilane, tetra-tert-butoxysilane, tetra Pentaethoxysilane, tetrapenta-iso-propoxysilane, tetrapenta-n-propoxysilane, tetrapenta-n-butoxysilane, tetrapenta-sec-butoxysilane, tetrapenta-tert-butoxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyl Tripropoxysilane, methyltributoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dimethylethoxysilane, dimethylmethoxysilane, dimethylpropoxysilane, Methyl-butoxy silane, methyl dimethoxy silane, methyl diethoxy silane, hexyl trimethoxy silane and the like.
[0025]
Note that the convex portion 33 layer can be formed using not only the above-mentioned reaction curable resin but also a thermoplastic resin. For example, acrylic resins such as methyl methacrylate and ethyl methacrylate, polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, polycarbonate, polyhydrocarbons such as polystyrene, polypropylene, and polymethylpentene, 6,6 nylon, 6 It can be selected from polyamides such as nylon, saponified ethylene / vinyl acetate copolymer, polyimide, polysulfone, polyvinyl chloride, acetylcellulose and other thermoplastic resins.
[0026]
Further, in order to join the sheet body 12 to the tube body 11, the sheet body 12 has an adhesive layer 35.
[0027]
The adhesive layer 35 can be selected from materials such as heat activated adhesives, solvent activated adhesives or pressure sensitive adhesives. For example, polyacrylate adhesives, natural rubber adhesives, and thermoplastic rubber adhesives are well known as useful adhesives. They are resistant to fluid flowing in the pipe, and are resistant to pressure, temperature change, and impact. Those having resistance are also desirable.
[0028]
The thickness of the adhesive layer 35 is not particularly limited, but is generally in the range of 10 to 100 μm.
[0029]
When the tube body 11 and the sheet body 12 are joined, the release sheet can be bonded to the surface of the adhesive layer 35 in advance so that the release sheet can be peeled off and the tube body 11 can be joined more easily. become.
[0030]
A plurality of sheet bodies 12 may be connected to each other by a joint A, but it is desirable to make the joint A as small as possible. In addition, it is desirable to join the pipe body 11 and the pipe body 11 with the same cross section of the riblet shape 33a.
[0031]
In addition, if the base material 34 of the sheet body 12 has adhesiveness, the adhesive layer 35 is not necessarily provided.
[0032]
Next, a typical shape of the riblet shape 33 of the sheet body 12 is shown in FIG. FIG. 7 shows the sheet body 12 excluding the adhesive layer 35 for convenience. As shown in FIG. 7, the riblet shape 33 has a triangular cross section (FIG. 7A), a semicircular cross section (kamaboko) (FIG. 7B), or a cross section facing inward. The thing of the triangle (reverse kamaboko body) (FIG.7 (c)) which has the two sides 36 which curve is considered. For example, in the case where the cross section is triangular, if h is the height and the twill interval is s, h = 0.1 to 1000 μm, preferably 1 to 1000 μm, most preferably 1 to 500 μm, s = 0.1 to 1000 μm, Preferably it is 1-1000 micrometers, Most preferably, it is 1-500 micrometers. In addition, as the riblet shape 33, the cross-section is a sine curve, the upper half (mountain) is a sine curve, the lower half (valley) is V-shaped, trapezoidal, and columnar, and the axis is 1 They may be arranged adjacent to each other so as to be substantially parallel to the dimensional direction.
[0033]
Next, the shape of the sheet body 12 before being fixed to the tube body 11 will be described with reference to FIGS. 1 to 3. The sheet body 12 is formed in a band shape as shown in FIG. 1, and the longitudinal direction (arrow L ₁ direction) of the convex portion 33 is inclined by a predetermined angle θ with respect to the longitudinal direction (arrow L ₂ ) of the band sheet sheet 12. ing.
[0034]
In this case, the base material 34 of the sheet body 12 also extends in a band shape in the direction of the arrow L ₂ , and the convex portion 33 on the base material 34 is inclined by a predetermined angle θ with respect to the base material 34.
[0035]
Next, the predetermined angle θ will be described below.
[0036]
Consider an angle θ ₀ that satisfies cos θ ₀ = d / L, where L is the inner peripheral length of the tube body 11 and d is the width of the sheet body 12. When the predetermined angle θ = θ ₀ , the sheet body 12 is spirally wound around the inner surface of the tube body 11 so that the longitudinal direction L ₁ of the convex portion 33 coincides with the longitudinal direction of the tube body 11. By sticking to, the convex part 33 extended in the direction substantially corresponded with the longitudinal direction of the pipe | tube main body 11 can be provided in the inner surface of the pipe | tube main body 11. FIG. At this time, the sheet body 12 is wound without a gap so as not to overlap the inner surface of the tube body 11.
[0037]
Here, when the tube main body 11 is a cylindrical tube, the inner peripheral length L of the tube main body 11 can be obtained by L = 2πR (R = radius of the tube main body). In the case of a tube (see FIG. 8), it can be obtained by L = 4D (D = length of one side).
[0038]
When the predetermined angle θ is θ ₀ −10 ° ≦ θ ≦ + 10 ° and the sheet body 12 is spirally wound around the inner surface of the tube body 11, the convex portion 33 formed on the inner surface of the tube body 11 is Although the inclination is within a range of ± 10 ° with respect to the longitudinal direction of the tube body 11, even if the convex portion 33 is inclined to this extent, the effect of reducing the frictional resistance by the convex portion 33 does not change.
[0039]
Next, the manufacturing method of the sheet | seat body 11 is demonstrated with reference to FIG. 2 and FIG.
[0040]
As shown in FIGS. 2 and 3, the sheet body manufacturing apparatus forms a sheet supply unit 23 that supplies a belt-like base material 34 and a plurality of convex parts 33 that extend linearly with respect to the belt-like base material 34. A grooved cylinder 20 for producing the belt-like sheet body 12 and a sheet winding unit 24 for winding the belt-like sheet body 12 are provided.
[0041]
Of these, the grooved cylinder 20 has a groove 20a having a reverse shape with respect to the convex portion 33. The groove 20a is formed on the outer periphery of the grooved cylinder 20 so as to be substantially orthogonal to the axis of the grooved cylinder 20. Yes. Further, the sheet supply unit 23 and the sheet take-up unit 24 have a predetermined angle θ with respect to the grooved cylinder 20 when the base material 34 extends from the sheet supply unit 23 to the grooved cylinder 20 with respect to the grooved cylinder 20. 34 is arranged so as to be inclined at the same angle as the inclination angle θ of the convex portion 33 with respect to 34. For this reason, the direction of the convex part 33 of the sheet | seat body 12 can be made to incline only the predetermined angle (theta) with respect to the direction of the base material 34. FIG.
[0042]
2 and 3, the base material 34 supplied from the sheet supply unit 23 is guided to the grooved cylinder 20 by the roller 28. During this time, the ionizing radiation curable resin liquid is filled in the groove 20 a of the grooved cylinder 20 from the filling device 26, and the ionizing radiation curable resin liquid in the groove 20 a is applied onto the substrate 34. Next, the radiation curable resin liquid on the substrate 34 is cured by the ultraviolet rays from the ultraviolet irradiation device 25, and the convex portions 33 are formed on the substrate 34 to produce the sheet body 12. Thereafter, the sheet body 12 is guided to a sheet winding body 24 via a roller 29 and wound.
[0043]
In FIG. 2, the rollers 28 and 29, the filling device 26, and the ultraviolet irradiation device 25 are removed for convenience.
[0044]
As described above, according to the present embodiment, the convex portion 33 can be easily formed on the inner surface of the tube body 11 by winding the sheet body 12 without gaps so as not to overlap the inner surface of the tube body 11. .
[0045]
Next, a modification of the present invention will be described with reference to FIGS. 4 to 6, an example in which a cylindrical body is used as the tube body 11 is shown. However, the present invention is not limited to this, and a rectangular tube shape may be used as the tube body 11 (FIG. 8).
[0046]
Moreover, although what has the base material 34 and the convex-shaped part 33 was shown as the sheet body 12, the sheet body 12 is comprised from the base material 44 which has the convex-shaped part (riblet shape) 43a provided in the inner surface, You may provide the contact bonding layer 45 in the outer surface side of the base material 44 (FIG. 9).
[0047]
As a method for manufacturing the sheet body 12 as shown in FIG. 9, for example, a known hot press method (described in JP-A-56-157310) can be used. In this case, as the material of the base material 44 of the sheet body 12, polyolefin (for example, polyethylene, polypropylene, ethylene / vinyl acetate polymer, ethylene / ethyl acrylate polymer), vinyl polymer (for example, polyvinyl chloride, vinyl chloride / vinyl chloride) Sheets of vinyl acetate polymer, vinyl chloride / vinyl alcohol polymer, polyvinylidene chloride), polyurethane (eg polyester and polyether urethane), cellulosic (eg cellulose acetate) and polyamide (eg nylon) are preferred, especially It is not limited.
[0048]
【The invention's effect】
As described above, according to the present invention, it is possible to easily manufacture a belt-like sheet body having a convex portion provided to be inclined in the longitudinal direction. Moreover, a convex part can be easily formed in a pipe main body only by winding a sheet | seat body helically on the inner surface of a pipe main body, and the manufacturing process and manufacturing cost of a convex part can be reduced.
[Brief description of the drawings]
FIG. 1 is a view showing a belt-like sheet body according to the present invention.
FIG. 2 is a perspective view showing a method for producing a belt-like sheet body according to the present invention.
FIG. 3 is a side view showing a method for producing a belt-like sheet body according to the present invention.
FIG. 4 is a perspective view showing a fluid inflow pipe.
FIG. 5 is an enlarged cross-sectional view of a fluid inflow pipe.
FIG. 6 is an enlarged cross-sectional view of a sheet body.
FIG. 7 is a diagram showing a representative shape of a convex portion.
FIG. 8 is a view showing a tube body and a sheet body of a rectangular tube portion.
FIG. 9 is a view showing a modified example of the sheet body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Fluid inflow pipe 11 Pipe main body 12 Sheet body 20 Grooved cylinder 20a Groove 23 Sheet supply part 24 Sheet winding part 33 Convex part 34 Base material 35 Adhesive layer

Claims (5)

In the belt-like sheet body fixed to the inner surface of the pipe body into which the fluid flows,
A plurality of convex portions extending linearly at a predetermined angle with respect to the longitudinal direction of the substrate are formed on the surface of the belt-shaped substrate including the belt-shaped substrate,
The predetermined angle θ of the convex portion is determined by θ ₀ −10 ° ≦ θ ≦ θ ₀ + 10 °,
A belt-like sheet body characterized in that cos θ ₀ = d / L, where L is the inner peripheral length of the tube body and d is the width of the sheet body. Belt-like sheet of claim 1, wherein the has a predetermined angle theta = theta ₀ of the convex portion. In the manufacturing apparatus of the strip-shaped sheet body fixed to the inner surface of the pipe body into which the fluid flows,
A sheet supply unit for supplying a belt-shaped substrate;
A grooved cylinder for forming a sheet body by forming a plurality of convex portions extending linearly with respect to a belt-like substrate from the sheet supply portion, wherein a plurality of grooves substantially perpendicular to the axis are formed on the outer periphery; ,
A sheet winding unit that winds the belt-like sheet body from the grooved cylinder,
The sheet supply unit and the sheet take-up unit are arranged so that a base material extending from the sheet supply unit to the grooved cylinder is inclined with respect to the grooved cylinder by a predetermined angle with respect to the grooved cylinder. Body manufacturing equipment. The predetermined inclination angle θ between the base material and the grooved cylinder is determined by θ ₀ −10 ° ≦ θ ≦ θ ₀ + 10 °,
4. The apparatus for producing a strip-shaped sheet body according to claim 3, wherein cos [theta] ₀ = d / L, where L is the inner peripheral length of the tube body and d is the width of the sheet body. 5. The apparatus for manufacturing a belt-like sheet body according to claim 4, wherein the predetermined inclination angle is θ = θ ₀ .

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