JP2005155777A - Sound absorption thermal insulation material for hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound absorption thermal insulation duct provided with bending property or flexibility, capable of improving piping workability, having an excellent thermal insulation property and allowing mass production at low cost, and being gentle for environment. <P>SOLUTION: This sound absorption thermal insulation material for the hose (including a tube and a duct) is (1) a nonwoven fabric cloth sound absorption material made of matrix fibers and thermally fused fibers and the sound absorption thermal insulation material for the duct having matrix fibers of 30 to 95 wt%. (2) It is preferable that density of the nonwoven fabric cloth sound absorption material is 5 kg/m<SP>3</SP>to 100 kg/m<SP>3</SP>, its thickness of 1mm to 100 mm, and its width is 10 mm to 1,000 mm. (3) It is preferable that at least one kind of the matrix fibers has a heteromorphic structure. (4) It is preferable that the direction of MD of tensile strength of the nonwoven fabric cloth is 5N/cm<SP>2</SP>to 50N/cm<SP>2</SP>, and the direction of CD is 3N/cm<SP>2</SP>to 40N/cm<SP>2</SP>. (5) Surface hardness of the nonwoven fabric cloth is 15 to 60. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gas transfer hose (including a tube and a duct), for example, a gas transfer hose having a heat insulating action and a sound absorbing action suitable for a duct hose for air conditioning heating at a temperature different from room temperature. It relates to a sound-absorbing heat insulating material.

  A conventional general gas transfer duct of this type is a duct in which a foam for heat insulation is spirally wound around the outer peripheral surface of the duct body, and a thin film-like resin tape is wound around the outer peripheral surface. The main body formed the inner peripheral surface of the duct. Moreover, as these sound-absorbing materials, an open-cell resin band such as urethane is used, and it is easy to cut at the time of winding and the workability is not good.

  Patent Document 1 discloses a soundproof tube member including a soundproof layer provided around a tube and a film (heat-shrinkable film) that covers the outer surface of the soundproof layer. In this document, the sound insulation layer is made of a vinyl chloride resin. As the vinyl chloride resin, for example, it is obtained by random copolymerization or block copolymerization with at least one monomer copolymerizable with vinyl chloride monomer in addition to resin polymerized with vinyl chloride alone. Vinyl chloride copolymer resin, for example, vinyl acetate-vinyl chloride copolymer, ethylene-vinyl chloride copolymer, vinylidene chloride-vinyl chloride copolymer, or a graft copolymer with a resin that can be graft copolymerized with a vinyl chloride monomer The vinyl chloride graft copolymer resin obtained, for example, ethylene-vinyl acetate-vinyl chloride graft copolymer, polyurethane-vinyl chloride graft copolymer, etc. can be suitably used, and the sound absorbing layer is made of urethane, chloroprene, styrene butadiene copolymer. Polymer, polyethylene, polypropylene, ethylene vinyl acetate, styrene resin alone Or are those combination with, and has a continuous pore structure. However, these open cell structures have low strength, and it is necessary to use a reinforcing material or to laminate a sound insulation layer and a sound absorption layer at the time of winding.

  Further, in Patent Document 2, in a conventional duct, noise generated from a blower source such as a blower is guided to the opening of the duct as the duct becomes a guide cylinder and is discharged together with the gas. Gives people discomfort. Since this noise is continuously generated during the use of the duct, that is, during the air blowing operation, there is a problem that it also disturbs human nerves. As one of the means to solve the problem, a fibrous band having a predetermined width (for example, a nonwoven fabric formed by laminating continuous long fibers of polypropylene (PP) and bonded by hot embossing) is spirally wound and a hard resin is formed between the connection edges. Adhering with a band material to form an inner surface layer of the duct, an open cell foam layer spirally wound on the outer peripheral surface of the open cell foam band with the side edges contacting each other, and a thin film sheet on the outer peripheral surface An outer sheet layer formed by spirally winding a resin band, and forming an intermediate sheet layer formed by spirally winding a strip and a closed cell layer spirally wound by a closed cell foam band on its outer peripheral surface We have developed and proposed a structure that is wrapped in. The problem with this product is that it is not possible to satisfy sound absorption performance and heat insulation performance only with a fiber band of a predetermined width (for example, a nonwoven fabric formed by laminating continuous long fibers of polypropylene (PP) and applying heat embossing). Cellular foam had to be used, the manufacturing process was complicated and the cost was not satisfactory.

Patent Document 3 discloses a non-woven fabric layer formed into a cylindrical shape by winding a non-woven fabric of a predetermined width in a spiral shape while the side edges are abutted or polymerized, and a wire made of a hard synthetic resin. A reinforcing core material that is spirally wound on the joint portion of the nonwoven fabric, the polymerization surface of which is fused or bonded to the nonwoven fabric, and a foamed resin belt material that is formed in a strip shape having substantially the same width as the nonwoven fabric, Foam strip layer wound spirally in a state in which both side edge portions are positioned on adjacent two reinforcing core members, a side surface on the unwrapped side of the foam strip member, and unwinding of the reinforcing core member There is disclosed a sound-absorbing and heat-insulating duct composed of an adhesive resin bonded over the side surface on the rotation side and a resin-coated film layer covering the outer peripheral surface of the foamed strip layer. This sound-absorbing and heat-insulating duct has an excellent effect of being able to achieve almost perfect silencing and heat-insulating functions as planned, and is an ideal suitable product for use as a blower duct. However, the problem with this product is that the sound absorbing material is mainly a foamed resin band formed in a strip shape, and the two layers of the non-woven fabric layer and the foamed band material layer have a sound absorbing function and a heat insulating function. The manufacturing process is somewhat complicated.

Japanese Patent Laid-Open No. 10-96496 JP 9-89357 A JP 2000-220882 A

  The object of the present invention is to solve the above-mentioned problems, have flexibility or flexibility, improve piping workability, have excellent soundproofing properties and greatly improve both heat insulation properties, and continuously produce in production. Therefore, it is intended to provide a sound-absorbing and heat-insulating duct that is suitable for the above-mentioned, can be mass-produced at low cost, does not require new equipment, and is environmentally friendly.

The object is (1) a nonwoven fabric sound-absorbing heat insulating material composed of matrix fibers and heat-sealing fibers, wherein the matrix fibers are 30 to 95 wt% and the heat-sealing fibers are 5 to 70 wt%. Achieved by sound absorbing insulation. Further, (2) at a density of the nonwoven fabric sound absorbing material ^{5kg / m 3 ~100kg / m 3} , a thickness of 1 mm to 100 mm, width is preferably 10Mm～1000mm, (3) at least one of said matrix fibers There is preferably a different structure, (4) it is preferred that the MD direction of the tensile strength of the nonwoven fabric is ^{5N / cm 2 ~50N / cm 2} , CD direction is ^{3N / cm 2 ~40N / cm 2} , ( 5) Achieved by a sound-absorbing heat insulating material for hoses (including tubes and ducts), wherein the nonwoven fabric has a surface hardness of 15-60.

  According to the present invention, it is excellent in soundproofing without using a foamed resin band material, both heat insulation can be greatly improved, piping workability can be improved, and in production, it is suitable for continuous production and can be mass-produced at low cost. It is possible to provide a structure that does not require a new facility, and can provide an environment-friendly sound-absorbing and heat-insulating duct.

  The sound-absorbing heat insulating material for a hose of the present invention is made of a matrix fiber and a heat-sealing fiber, and is a non-woven fabric composed of 30 wt% to 95 wt% of the matrix fiber and 5 to 70 wt% of the heat sealing fiber.

Moreover, it is preferable to have the following characteristics. , A density of the nonwoven fabric is ^{5kg / m 3 ~100kg / m 3} , a thickness of 1 mm to 100 mm, it is preferable width is 10Mm～1000mm. Moreover, it is preferable that at least one of the matrix fibers is composed of atypical structural fibers. Further, it is preferable that the tensile strength of the nonwoven fabric MD direction ^{5N / cm 2 ~50N / cm 2} , CD direction is ^{3N / cm 2 ~40N / cm 2} . Moreover, it is preferable that the surface hardness of the said nonwoven fabric is 15-60. A nonwoven fabric whose surface is formed into a film by heat treatment is preferred.

  Examples of the heat-fusible fibers preferably used in the present invention include core-sheath type heat-fusible fibers in which the sheath part is made of polyolefin or isophthalic acid or ε-caprolactone copolymer polyester and the core part is polyethylene terephthalate. .

  A core-sheath type heat-fusible fiber made of a copolyester having a melting point of 110 ° C. to 130 ° C. is easily processed at a low temperature by heat treatment. Moreover, the core-sheath type heat-fusible fiber whose sheath part is made of polyolefin is flexible and therefore suitable for duct piping applications having a small curvature. Further, the core-sheath type heat-fusible fiber having ε-caprolactone copolymer polyester as a sheath component is suitable for a portion requiring heat resistance because of its high melting point.

  As for content of the heat-fusible fiber of the said nonwoven fabric sound-absorbing heat insulating material, 5 wt%-70 wt% are preferable. If it is within this range, the adhesive strength is poor, so there is no risk of the nonwoven fabric's strength being lowered, and the nonwoven fabric's texture becomes too hard. The fit to the hose will not deteriorate.

  The matrix fibers preferably used in the present invention may be natural fibers or synthetic fibers. When natural fibers are used, for example, wool, cotton, silk and the like can be used. Also, rayon regenerated from natural fiber may be used. Moreover, you may mix these 2 or more types.

  Examples of synthetic fibers include acrylic, modacrylic, polyethylene terephthalate, polybutylene terephthalate, polyesters such as polylactic acid, polyamides such as nylon 6 and nylon 66, and copolymers thereof, polyethylene naphthalate, polytrimethylene terephthalate, and the like. Can be used. Moreover, you may mix these 2 or more types.

  Synthetic fibers can be used as they are, but those provided with various performances by post-processing may be used. For example, those subjected to water repellent treatment, flame retardant treatment and the like can be mentioned.

  On the other hand, if it is composed of 100% polyester-based synthetic fiber, it is preferable because it is environmentally friendly due to combustion generated gas and versatility, and workability is also good. It is also preferable from the viewpoint of recycling to use recycled fibers from PET bottles.

  The fineness of these synthetic fibers is not particularly limited, but 1 dtex to 30 dtex is preferable. For general purposes, 2 to 15 dtex is more preferable. Below 1 dtex, processability is poor and costs are high. On the other hand, at 30 dtex or more, the sound absorption performance and heat insulation performance deteriorate.

Density of the nonwoven acoustical insulation material of the present invention is ^5kg / ^{m 3 ~100kg} / m 3 is preferred. Within this range, the sound absorption performance and heat insulation performance are sufficient and the strength is appropriate, the rigidity becomes too high, the processing and workability deteriorate, and the cost does not increase. Similarly, the thickness of the nonwoven fabric sound-absorbing heat insulating material of the present invention is preferably 1 mm to 100 mm. What is necessary is just to select suitably according to the magnitude | size of a hose (a tube and a duct are included). Within this range, sound absorption performance and heat insulation performance are sufficient, and strength is suitable for workability and workability. Similarly, the width is preferably 10 mm to 1000 mm. The width of the nonwoven fabric may be appropriately selected depending on the diameter of the hose, but this range is preferable from the viewpoint of workability and handling.

  It is preferable that at least one of the matrix fibers is a modified cross-section fiber. In particular, hollow cross-section fibers are preferred because they give the nonwoven fabric bulkiness and good heat insulation performance.

Further, the tensile strength of the nonwoven fabric acoustic insulation material is preferably the MD direction is at a ^{5N / cm 2 ~50N / cm 2} , CD direction ^{3N / cm 2 ~40N / cm 2} . When the tensile strength in the MD direction is 5 N / cm ² or less, the nonwoven fabric is cut or stretched during slitting or rewinding of the nonwoven fabric or when the nonwoven fabric sound-absorbing heat insulating material is wound around the hose. If it is 50 N / cm ² or more, the rigidity becomes too high and the workability and workability deteriorate. Similarly, when the tensile strength in the CD direction is 3 N / cm ² or less, the width of the nonwoven fabric tends to fluctuate during slitting or rewinding of the nonwoven fabric or when the nonwoven fabric sound-absorbing heat insulating material is wound around the hose. Further, if it is 40 N / cm ² or more, the rigidity becomes too high and the workability and workability deteriorate.

  Moreover, it is preferable that the surface hardness of a nonwoven fabric is 15-60. If it is 15 or less, it is too soft and the thickness varies, and if it is 60 or more, the fit to the hose is poor and the sound absorption performance and heat insulation performance are insufficient. Moreover, workability | operativity also worsens.

  Moreover, it is preferable that the nonwoven fabric has a film-like surface by heat treatment. When the surface is made into a film by heat treatment, the smoothness is improved, and the tensile strength is increased and the elongation can be suppressed, so that the fit to the hose is improved and the workability and performance are also improved.

  For example, these heat treatments may be continuously heat-sealed with a hot-air circulating dryer or with a far-infrared heater. In these heat treatments, only the one surface of the nonwoven fabric is heated, or the surface of the nonwoven fabric is obtained in a film form by heat-treating one surface side at a higher temperature than the other surface. Alternatively, the surface of the nonwoven fabric may be formed into a film by fusing it normally with a hot air circulation dryer or far-infrared heater and then bringing one side of the nonwoven fabric into contact with the heat plate.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to this Example. Unless otherwise specified, “%” indicates “wt%”.

About evaluation method of nonwoven fabric sound-absorbing heat insulating material for hose 1) Surface hardness measurement method "Asker rubber hardness meter F type" scale = 0-100 made by Kobunshi Keiki Co., Ltd. Gently place the instrument on the sample surface while keeping the pressure surface almost parallel, and read the pointer on the scale plate.

2) Tensile strength A test piece cut to a width of 20 mm and a length of 150 mm is prepared from the sample, and measured according to JIS L 1913 with a constant speed extension type tensile tester. As a result, the strength (N / cm ² ) per unit cross-sectional area of the nonwoven fabric is calculated from the thickness and width, and an average value of n = 5 is taken.

[Example 1]
Kanebo Synthetic Co., Ltd. polyethylene terephthalate (PET) hollow short fiber H588 (15 dtex × 51 mm) 70%, heat-bonded fiber unitized copolymer short fiber 4080 (2.2 dtex × 51 mm) 30% Was opened, blended, and card punched and punched after cross layer treatment. Subsequently, 140 ° C. to 200 ° C. heat treatment is performed from both sides of the sample, and the nonwoven fabric is compressed with a roller at the exit of the heat treatment zone to adjust the thickness to a density of 20 kg / m ³ and a thickness of 10 mm. Got. This nonwoven fabric was sliced to a width of 300 mm and further sliced to 50 mm. This nonwoven fabric has a tensile strength in the MD direction of 20 N / cm ² , a tensile strength in the CD direction of 15 N / cm ² , and a surface hardness of 25. This nonwoven fabric can be used for hoses without using open-cell foams. As a sound-absorbing heat insulating material, sound absorption and heat insulating performance are good, and since it has appropriate elasticity and tensile strength, workability is also good.

[Example 2]
60% of polyethylene terephthalate (PET) hollow short fiber H588 (15 dtex × 51 mm) manufactured by Kanebo Synthetic Co., Ltd., 40% of copolymerized PET short fiber 4080 (2.2 dtex × 51 mm) manufactured by Unitika Fiber Co., Ltd. as heat-bonding fiber Was opened, blended, and card punched and punched after cross layer treatment. Subsequently, 140 ° C. to 200 ° C. heat treatment is performed from both sides of the sample, and the nonwoven fabric is compressed with a roller at the exit of the heat treatment zone to adjust the thickness to a density of 80 kg / m ³ and a thickness of 25 mm. Got. This nonwoven fabric was sliced to a width of 500 mm. This nonwoven fabric has a tensile strength in the MD direction of 40 N / cm ² , a tensile strength in the CD direction of 35 N / cm ² , and a surface hardness of 50, and this nonwoven fabric has a large diameter without using open cell foam. As a sound absorbing and heat insulating material for duct hoses, the sound absorbing and insulating performance is good, and since it has appropriate elasticity and tensile strength, workability is also good.

[Example 3]
Polyethylene terephthalate (PET) short fiber 38Y (3.3 dtex ×) with 30% Y cross-section polyethylene terephthalate (PET) short fiber SP8805 (5.5 dtex × 51 mm) manufactured by Kojima Sangyo Co., Ltd. 51%), 20% of Kanebo Gosei Co., Ltd. polyethylene terephthalate (PET) short fiber 310 (2.2 dtex × 51 mm), 20% of heat-bonded fiber, Copolymerized PET short fiber 4080 (2) .2 dtex × 51 mm) 20% was opened and blended, and after carding and cross-layer treatment, needle punching was performed. Subsequently, 140 ° C to 200 ° C heat treatment is performed from both sides of the sample, and further, the one side heated roller is compressed at the outlet of the heat treatment zone, the other is compressed by a non-heated roller, the thickness is adjusted, and one side is melted to form a thin film A nonwoven fabric was obtained. This nonwoven fabric was sliced to a width of 20 mm. This nonwoven fabric has a density of 5 kg / m ³ , a thickness of 5 mm, a tensile strength in the MD direction of 10 N / cm ² , a tensile strength in the CD direction of 10 N / cm ² , and a surface hardness of 15. Even if no foam is used, it has good sound absorption and heat insulation performance as a small-diameter hose sound-absorbing heat insulating material, and it has good elasticity and tensile strength, so it has good workability.

[Comparative Example 1]
A sound insulation sheet (thickness 2 mm) made of vinyl chloride resin and a sound absorbing sheet (thickness 4 mm) made of open cell polyethylene foam sheet (made by INOAC Corporation) with a foaming ratio of 30 times are laminated and integrated. The sound-absorbing sheet was attached to the inside, and a polyvinyl chloride film was laminated on the outer surface of the sound-insulating sheet and heated, so that the sound-insulating layer and the film were integrated to produce a sound-insulating tube member. The process was complicated and the workability was not good.

[Comparative Example 2]
A continuous strip of polypropylene (PP) is laminated, a flat strip-shaped fiber strip formed by heat embossing is wound spirally, and the outer periphery between adjacent joints is bonded and integrated with a resin reinforcing strip. An inner surface layer formed in a smooth cylindrical shape, a plurality of resin linear bodies bonded to a fibrous body between different resin reinforcement bodies, and a continuous foamed resin band on the outer peripheral surface of the inner surface layer An open-cell layer formed in a spiral shape with the edges butting together, and an intermediate portion of the spiral formation by polymerizing a part of the thin sheet-like belt made of resin on the outer peripheral surface of the layer while polymerizing a part thereof A sheet layer, a closed cell layer in which the closed cell resin body is abutted between the side edges on the outer peripheral surface of the layer, and a spirally closed cell layer, while polymerizing a part of the resinous thin sheet band on the outer peripheral surface With an integrally formed outer surface layer To prepare a heat-insulating sound deadening member. The process was complicated and the workability was not good.

  The present invention relates to a gas transfer hose (including a tube and a duct), for example, a gas transfer hose having a heat insulating action and a sound absorbing action suitable for a duct hose for air conditioning heating at a temperature different from room temperature. Suitable as a sound absorbing heat insulating material.

Claims (6)

A non-woven sound-absorbing heat insulating material comprising a matrix fiber and a heat-sealing fiber, wherein the matrix fiber is 30 wt% to 95 wt%, and the heat-sealing fiber is 5 wt% to 70 wt%. The non-woven acoustic insulation material density ^5kg / ^{m 3 ~100kg} / m 3 of a thickness of 1 mm to 100 mm, hose acoustic insulation material of claim 1, wherein the width is 10Mm～1000mm. The sound-absorbing heat insulating material for hoses according to claim 1 or 2, wherein at least one of the matrix fibers is a modified cross-section fiber. Hose according to any one of claims 1 to 3 tensile strength of the nonwoven fabric MD direction ^{5N / cm 2 ~50N / cm 2} , CD direction, characterized in that there in ^3N / cm ^{2 ~40N} / cm 2 Sound absorbing insulation. The sound absorption heat insulating material for hoses according to any one of claims 1 to 4, wherein the nonwoven fabric has a surface hardness of 15 to 60. The sound absorbing heat insulating material for hoses according to any one of claims 1 to 5, wherein the nonwoven fabric has a film-like surface formed by heat treatment.