JPH1163638A - Compressible duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a construction of a compressible duct compact and to lower transportation and storage cost of a duct, by providing a duct which includes a resin film to which a metal foil is applied or metal is vapor-deposited as an inner surface, an open pore layer as an intermediate layer and an airtight layer as an outer shell, and disposing spirally or annularly reinforcing bodies at a given interval in a longitudinal direction. SOLUTION: In a duct for an air conditioner which has an antidewing ability for air conditioning pipes and a resiliency, the duct has a resin film layer 1 to which a metal foil is applied or metal is vapor-deposited. This is wound in a spiral while allowing an overlapping portion to adhere, and a reinforcing body 2 is positioned and incorporated in the overlapping portion, thus producing an inner tube 3. An intermediate layer is formed on the inner tube 3 by abutting both longitudinal sides 5 of a strip-shaped body of an open pre layer 4 in a cylindrical shape, an airtight layer 7 is coated on the open pore layer 4, and an overlapping portion 6 is stuck with a thermal welding or an adhesive. As the reinforcing body 2, any rigid material, for example, iron polypropylene, polyester, polyamide and the like in a spiral shape of ring shape can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of preventing dew condensation in an air-conditioning pipe, and is flexible so that a flexible installation pipe can be easily formed and transported and stored by having excellent compressibility. TECHNICAL FIELD The present invention relates to a duct capable of reducing cost by reducing the volume at the time, particularly to an air conditioning duct.

[0002]

2. Description of the Related Art Conventionally, as an air conditioning duct, glass wool laminated with aluminum foil is mainly wound on a metal pipe and pressed with a turtle net, or a straight pipe made of glass wool solidified with a resin binder, and has a surface thereof. The one which the aluminum foil was stuck on is used. However, since they are not flexible, when the piping is fine and complicated, such as in a standing house, a resin flexible duct mainly composed of closed-cell foam and open-cell foam (JP-A-8-219335) is used. Has been simplified.

[0003]

However, the flexible duct mainly composed of resin disclosed in Japanese Patent Application Laid-Open No. 8-219335 cannot reduce the volume of the duct, and has a problem in transportation and storage. In addition, the dew condensation prevention performance of the outer surface was insufficient, and a problem due to dew water had occurred. Accordingly, the present invention has been made to solve these problems, and in particular, the shape of the duct is not destroyed by the compression that shortens the longitudinal direction, the compact and portable, and the cost for transportation and storage is saved. It is an object of the present invention to provide a duct which is capable of using a radiant heat and having excellent heat insulation performance without any problem in workability even if the duct is cut arbitrarily.

[0004]

The object of the present invention is to provide a spiral or ring-shaped reinforcing member having a metal foil or a metal-deposited resin film on the inner surface, an open cell layer on the intermediate layer and an airtight layer on the outer shell. Can be achieved by providing ducts that are regularly spaced along the length.

[0005]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a plan view including a partial cross section of a duct which is an example of the present invention. A metal foil or a metal-deposited resin film layer 1 of the duct is spirally wound while bonding an overlapping portion, and at the same time, The inner pipe 3 is formed by compounding the reinforcing member 2 in the overlapping portion. On this inner tube 3, a strip of an open-cell layer 4 cut to the outer peripheral width of the inner tube is placed on two long sides 5.
Into an intermediate layer 5, and the airtight layer 7 cut by the length obtained by adding the width of the overlapping portion 6 to the outer peripheral width of the intermediate layer is coated on the open-cell layer 4 in a cylindrical shape. 6 is a duct obtained by heat-sealing or bonding with an adhesive.

[0006] In the present invention, the metal foil or the metal-deposited resin film 1 is necessary for providing heat retention and for providing excellent compressibility. Although various metals can be considered as the metal material, aluminum having a thickness of 10 to 100 μ is generally and preferably used. Further, among metal foils or metal-deposited resin films, metal-deposited resin films are particularly suitable because they are not damaged by compression. Examples of resin film materials include polyester, polyolefin (polyethylene, polypropylene, etc.), and polyvinyl chloride (polyvinyl chloride). PVC) and the like. As a metal-deposited resin film, a combination of various metals and resin films can be considered, but a polyester film with a thickness of 1 to 30μ and aluminum with a thickness of 1 to 30μ is optimally processed from the viewpoint of durability. It is. When a porous metal foil or a metal-deposited resin film 1 is used, the sound absorption performance of the duct can be further improved by passing and absorbing the sound through the open-cell layer 4, and the duct is compressed. This is preferable because sometimes the gas in the open cells can easily pass through and more excellent compressibility can be imparted.

As the reinforcing member 2, any hard material having a spiral or ring-like linear shape, for example, iron, stainless steel, polypropylene, PVC, polyethylene, polyester, or polyamide can be used. Considering this together, the core diameter of the rust-proofed 0.5-2.0mm
Hard steel wire is preferred. In FIG. 1, the reinforcing member is preferably located in an overlapping portion of a metal foil or a metal-deposited resin film, but is not limited thereto, and is exposed to the inner surface of the duct or bonded to the outer surface of the duct. By doing so, it is also possible to determine the shape retention and flexibility of the tube.

The inner tube 3 is made of a metal foil or a metal-deposited resin film 1 cut into a strip having a width of 10 to 50 mm.
mm, and the high steel wire of the reinforcing body 2 is sandwiched and bonded between the overlapping portions, and the pitch is 10 to 40 m.
It has spiral reinforcing bodies at m intervals, but is not limited.

The open-cell layer 4 may be any open-cell foam of various rubber-resin foams. In particular, the light-weight, sound-absorbing and compressible foaming ratio is 20 to 80 times, and the thickness is 1 to 50 mm. Are preferred. In addition, the intermediate layer composed of an open cell layer is an excellent compression in which the strip of the open cell layer 4 cut to the outer peripheral width of the inner tube is positioned on the inner tube by abutting two long sides 5 into a cylindrical shape. Although it is optimal because it can impart properties, it may be located on the inner tube with a slight overlap.

As the airtight layer 7, any plastic layered material, preferably an airtight film or sheet, or a composite film or sheet can be used as long as it does not allow passage of a fluid such as air flowing through a duct. Can be. For example, if a polyester film on which aluminum is vapor-deposited is used, it is possible to particularly prevent an increase in the temperature in the tube due to a radiation effect. When a sheet (low-density, medium-density, high-density polyethylene) laminated with a fiber layer such as a nonwoven fabric is used, the dew condensation preventing effect can be imparted by the fiber layer on the surface. Furthermore, even if it is a resin single sheet such as a PVC sheet, the basic effects of the present invention are not impaired. The shape of the airtight layer 7 is preferably cut into a belt-like body as shown in FIG. This is not particularly limited, and a tubular material extruded with an inner diameter matching the outer diameter of the intermediate layer is used as an airtight layer 7, into which an intermediate layer covered with an open cell layer 4 is inserted into an inner tube 3. To form a duct. Considering the effect of preventing dew condensation in the airtight layer 7 in which these various specifications can be considered, a fiber diameter of 5 denier or less made of various fibers is used.
Various heat-fusible resins are applied to a fibrous layer such as a nonwoven fabric having a thickness of 0.1 to 4 mm and a basis weight of 10 to 300 g / m ^2.
Those laminated at 300 g / m ² are preferred, and a combination of a polyester nonwoven fabric and a polyethylene resin is particularly optimal. In this case, the fiber layer such as a non-woven fabric is located on the outermost surface of the duct, and provides dew condensation prevention. Here, examples of the heat-fusible resin include polypropylene, polyamide, and the like in addition to polyethylene, polyester, and PVC described above. Examples of the fiber material include polyester, polyamide, polyolefin, polyacrylonitrile, and polyvinyl alcohol (vinylon).

As described above, the duct of the present invention comprising the metal foil or the metal-deposited resin film 1, the reinforcing member 2, the open-cell layer 4, and the airtight layer 7 has excellent dew condensation preventing properties and flexibility. There is no problem in workability even when cut arbitrarily, and the compressibility is extremely excellent. In particular, since the duct of the present invention has excellent compressibility, it is possible to pack the duct compactly without breaking the duct shape by compressing the longitudinal direction of the duct, and to reduce costs by reducing space during transportation and storage. In addition, since it is easily restored at the construction site, workability is greatly improved. Therefore, the present invention is extremely useful as an air conditioning duct. In the present invention, the compressibility means that when the length direction of the duct is held down by a certain pressure, the length is reduced and the duct becomes compact, and when the pressure is released, both ends of the duct are lightly pulled and the duct is compressed before the compression. Means to recover to length.

[0012]

The present invention will be further described with reference to the following examples. Example 1 The duct shown in FIG. 1 was obtained by the following method. 10μ
9μ polyester film on which aluminum has been deposited is slit to a width of 35 mm to form a metal foil for an inner tube or a resin film 1 on which a metal is deposited, and the deposited film 1 for an inner tube (having a thickness of 19μ) is overlapped by about 10 mm (pitch: 25 m).
m), and at the same time, the spiral hard steel wire 2 having a wire diameter of 1.0 mm is positioned almost at the center of the overlapping portion at the overlapping portion, and an ethylene-vinyl acetate copolymer hot melt adhesive (manufactured by Hitachi Chemical Polymer Co., Ltd.) The inner tube 3 having an inner diameter of 105 mm was formed by heat fusion using "Hybon"). The inner pipe has a width of 3
10 mm thick cut into 30 mm strip, foaming ratio 5
0 times of the polyurethane foam at the same time as butting tubular covering the two sides of the long sides of the (open cell layer 4), low density polyethylene 140g to 3 denier polyester fibers were basis weight in 120 g / m ² nonwoven / m ² The laminated sheet (airtight layer 7) was slit to a width of 400 mm, provided with an overlap portion 6 of about 10 mm, heat-fused with an iron-like heater, formed into a tube, and covered in a tubular shape. At this time, the airtight layer 7 was formed so that the nonwoven fabric surface became the outer surface of the tube, and a duct having an inner diameter of 105 mm was obtained.

Example 21 Holes having a hole diameter of 6 mm / cm
⁽² ) A porous vapor-deposited film (a 9-μm polyester film with 10-μm aluminum vapor-deposited) is slit to a width of 35 mm to form a metal foil or a metal-deposited resin film 1 for the inner tube.
μ) is spirally wound with an overlap width of about 10 mm (pitch: 25 mm), and at the same time, a helical hard steel wire 2 having a wire diameter of 1.0 mm is positioned substantially at the center of the overlap at the overlap portion, and the ethylene-vinyl acetate copolymer hot The inner tube 3 having an inner diameter of 105 mm was formed by heat fusion using a melt adhesive (“Hybon” manufactured by Hitachi Chemical Co., Ltd.). At the same time, the long side of a polyurethane foam (open cell layer 4) having a thickness of 10 mm and a foaming ratio of 50 times cut into a strip having a width of 330 mm is abutted with the inner tube to cover the inner tube with a cylindrical shape. A sheet (airtight layer 7) obtained by laminating low-density polyethylene at 140 g / m ² on a non-woven fabric with a fiber weight of 120 g / m ² and slit to a width of 400 mm was provided with an overlap portion 6 of about 10 mm. Then, they were heat-sealed by an iron-type heating machine, formed into a tube, and covered with a tube. At this time, the airtight sheet 7 is formed so that the nonwoven fabric surface becomes the outer tube surface,
A duct having an inner diameter of 105 mm was obtained.

Comparative Example 13 A spunbonded nonwoven fabric having a basis weight of 70 g / m ² using denier heat-fusible polyester fiber was slit to a width of 35 mm to form a fiber layer for an inner tube. .1mm) overlap width about 10m
m, and the overlap was heated with a non-frame torch at the same time, and a hard steel wire having a wire diameter of 1.0 mm was positioned substantially at the center and heat-fused to form an inner tube. A polyethylene foam (closed-cell resin layer) having a thickness of 6 mm, a foaming ratio of 40 times, and a density of 44 kg / m ³ and a foaming ratio of 50 mm and a thickness of 5 mm were placed in the inner tube.
A polyurethane foam having a density of 25 kg / m ³ was laminated in a sheet state, and a laminated foam strip slit to a width of 25 mm was spirally wound with the polyurethane foam (open cell resin layer) facing the inner tube. A fiber layer strip obtained by slitting a sheet obtained by laminating a low-density polyethylene with 140 g / m ² on a non-woven fabric in which 3-denier polyester fibers were laid at 120 g / m ² was slit to a width of 35 mm. And spirally wound around the tube surface while fusing to the polyethylene foam side. The bellows-shaped shaping was performed by pressing the reinforcing bodies with a disk-shaped roller or the like while heating them in a direction parallel to the reinforcing bodies, thereby shaping the valley shape to obtain a duct with an inner diameter of 105 mm below the peak.

The sound absorption performance was measured by cutting the duct obtained in Example 1 and Comparative Example 1 by 1 m to obtain a sample, emitting white noise with a sound pressure of 100 db from one end of the sample, and measuring the sound pressure at the other end 1 m ahead. Then, the amount of attenuation was compared. This measurement was performed in an anechoic chamber.

Table 1 shows the sound absorbing performance of Examples 1 and 2 and Comparative Example 1.

[0017]

[Table 1]

The dew condensation prevention performance is determined by setting the environment outside the duct to a temperature of 3
The tube surface temperature and the presence or absence of condensation were investigated after holding for 6 hours at a temperature of 2 ° C. and a humidity of 80%, an environment inside the duct at a temperature of 10 ° C., a humidity of 50%, and a wind speed of 2 m.

Table 2 shows the dew condensation preventing performance of Example 1 and Comparative Example 1.

[0020]

[Table 2]

The compression performance indicates that the length of the duct is reduced by holding it in a longitudinal direction with a certain pressure, and can be restored to the length before compression by expanding the duct when the pressure is released. The following experiment shows its superiority. The duct having a length of 1000 mm obtained in Example 1 and Comparative Example 1 is 130 × 130 × 1000 mm.
Was fixed at one end in a square pillar-shaped frame, and the length was measured with 5 kg of pressure applied from the other end, and the length was maintained for 1 hour. One hour later, the pressure was released and the duct was stretched with a tensile force of 5 kg to measure the length. Table 3 shows the results.

[0022]

[Table 3]

[0023]

According to the duct of the present invention, the tube shape is not destroyed due to the compression that shortens the longitudinal direction, the compact and portable, the cost for transportation and storage can be saved, and the duct is easily restored at the time of construction. Even if it is cut arbitrarily, there is no problem in workability, and it is also excellent in sound absorption and dew condensation prevention performance. Therefore, the present invention is extremely useful as an air conditioning pipe.

[Brief description of the drawings]

FIG. 1 is a plan view including a partial cross section of a duct as an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal foil or metal-deposited resin film 2 Reinforcement 3 Inner tube 4 Open cell layer 5 Two long sides of open cell layer 6 Overlap of airtight layer 7 Airtight layer

Claims (6)

[Claims] An inner surface has a metal foil or a metal-deposited resin film, an intermediate layer has an open cell layer and an outer layer has an airtight layer, and a helical or ring-shaped reinforcing member is constant in a length direction. Compressible ducts that are spaced apart. 2. The duct according to claim 1, wherein the metal foil or the metal-deposited resin film on the inner surface and the reinforcing member are integrated to form an inner tube. 3. The duct according to claim 1, wherein the metal foil or the metal-deposited resin film on the inner surface is porous. 4. The method according to claim 1, wherein the intermediate layer is a layer in which two long sides of an open-cell band are abutted on an inner tube, and an outer shell is a cylindrical body made of an airtight layer. The duct described in. 5. The duct according to claim 1, further comprising a fibrous layer on the outer airtight layer, wherein the fibrous layer is the outermost surface. 6. The duct according to claim 1, wherein the outer airtight layer is a metal foil or a metal-deposited resin film.