JP2014129838A - Flexible pipe material, method for manufacturing the same and sound absorption pipe material made of flexible material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible pipe material which is excellent in flexibility and elasticity, is excellent also in dimension stability, has a light weight, has easy handleability, can be molded in a long size, can retain strength characteristics even into a long term outdoor use, further, does not generate toxic gas upon burning and is suitable for an inner pipe of sound absorbing pipe material and the like, to provide a method for manufacturing the flexible pipe material and, in addition, to provide a sound absorbing material which is made of the flexible pipe material and is excellent in sound absorbing characteristics.SOLUTION: A flexible pipe material comprises a resin hard ore material 4 and a belt-like body 1. The resin hard core material and the belt-like body are integrally melted. Therein, any of the following (1) to (3) is satisfied: (1) either of the resin hard core material 4 and the belt-like body 1 is spirally wound; (2) the resin hard core material is made of olefin type resin and/or polyester type resin; and (3) the belt-like body is non-woven fabric having the core part made of polyester resin and the sheath part is made of core sheath type fiber of a lower melting point resin than the polyester resin.

Description

  The present invention relates to a hose that is excellent in flexibility and stretchability, is lightweight, easy to handle, and can be formed into a long shape, and particularly relates to a flexible pipe material that can be suitably used as a duct for air conditioning and a method for manufacturing the same. It is.

  Conventionally, a hose constructed by attaching a rigid reinforcement made of hard vinyl chloride to the outer surface of a hose wall formed by winding a soft vinyl chloride tape into a spiral shape and joining the side edges of each other is thermoforming. Although it was often used as a residential duct hose because of its excellent manufacturing cost, there is a technical limit to forming the wall thickness of the hose wall thin, and it is not possible to store it in a compact manner when not in use. It was difficult and heavy in weight, and was inconvenient to handle. Moreover, in recent global environmental problems, waste combustion products of vinyl chloride resin generate toxic gas or cause acid rain, or vinyl chloride resin itself is regarded as a carcinogenic substance, so its use is restricted. Tend to be added.

  In response to such market trends, Patent Document 1 discloses a spiral core formed by winding a nonwoven fabric tape having an air blocking layer formed on at least one surface of a nonwoven fabric layer into a spiral shape and joining adjacent side edges. A hose with a fused material has been proposed. The disclosure discloses a polyolefin non-woven fabric that has excellent heat-fusibility but has problems with long-term durability such as embrittlement due to oxidative degradation (housing use for 50 years or more). However, in recent years, there has been a growing need for noise reduction in homes, and a flexible non-woven tube material with air permeability (without an air barrier layer) is used as an inner tube, and a sound absorbing layer is formed on the upper tube. There has been a demand for a flexible sound-absorbing tube material that is wound and arranged to block air from the outermost layer, and a material that is excellent in heat-fusability and has no fear of durability even without an air blocking layer has been demanded.

  In response to this problem, Patent Document 2 proposes a flexible duct tape material comprising a core-sheath type composite continuous fiber non-woven fabric having a polyester polymer as a core component and a polyolefin polymer having a melting point lower than that of the core component as a sheath component. However, no specific means for producing a flexible duct from tape material has been disclosed, and no method has been found for obtaining a light weight, good dimensional stability, and a high-strength duct. Met.

Japanese Patent Laid-Open No. 10-227379 (Claims and Drawings) Japanese Unexamined Patent Application Publication No. 2004-144442 (Claims and Drawings)

The object of the present invention is excellent in flexibility and stretchability and excellent in dimensional stability, lightweight, easy to handle and can be formed into a long shape, and retains strength characteristics even after long-term outdoor use. Further, it is an object of the present invention to provide a flexible pipe material suitable for an inner pipe such as a sound-absorbing pipe material and a method for producing the same, which does not generate toxic gas during combustion.
Another object of the present invention is to provide a sound-absorbing tube material excellent in sound-absorbing characteristics.

  That is, the present invention is a flexible tube material comprising a resin hard core material and a belt-like body, and the resin hard core material and the belt-like body are fused and integrated, and the following (1) to (3): Both are satisfactory flexible tube materials. (1): Both the resin hard core material and the belt-like body are spirally wound. (2): The resin hard core material is composed of an olefin resin and / or a polyester resin. (3): The belt-like body is a non-woven fabric made of core-sheath fibers in which the core part is a polyester resin and the sheath part is a resin having a melting point lower than that of the polyester resin.

  Another embodiment of the present invention is a flexible tube material in which the band is a laminate of a nonwoven fabric and a film made of an olefin resin, and the film is positioned outside the nonwoven fabric.

  The present invention also includes a sound absorbing tube material in which a sound absorbing material is further laminated on the outside of the flexible tube material, and a sound absorbing tube material in which a covering air shielding layer is further laminated on the outside of the sound absorbing material.

  Furthermore, the present invention provides a belt-like body that is spirally wound on a pipe-making machine comprising a cylindrical pipe and a spring-like rotary rod that is inclined with respect to the pipe length direction along the pipe surface. A method for producing a flexible tube material, in which a belt-shaped body and the resin-hard core material melt-extruded are brought into contact with each other while rotating, and the resin-hard core material and the belt-shaped body are fused and integrated. After the extruded resin hard core material is brought into contact with the resin hard core material at 160 ° C. to 190 ° C. and fused and integrated, it is −10 ° C. to 60 ° C. on a pipe making machine. A method for producing a flexible tube material, which is subjected to a cooling treatment in an atmosphere of ° C. Preferably, a gas having a temperature of -10 ° C to 60 ° C is blown onto the flexible tube material during the cooling treatment. Is the method.

  By adopting the flexible tube material and the method for producing the flexible tube of the present invention, it is excellent in flexibility and stretchability, and also excellent in dimensional stability such as the tube diameter on the inner tube side of the flexible tube material, It is possible to provide a flexible tube material that is excellent in durability even when used under outdoor ultraviolet irradiation or under high temperature and high humidity. Moreover, it is excellent as an inner tube of a duct such as a sound absorbing tube material, and the sound absorbing tube material made of the flexible tube material of the present invention exhibits excellent sound absorbing characteristics.

It is a side view which shows the flexible pipe material of this invention, and its manufacturing method. It is a side view including the partial cross section which shows the flexible sound-absorbing tube material which used the flexible tube material of this invention as the inner tube. It is a side view which shows the typical melt | fusion structure cross section of the strip | belt-shaped body and resin hard core material in the flexible tube material of this invention. a: Adjacent belt-like bodies do not overlap including the end portions, or the end portions of the adjacent belt-like bodies are in contact with each other, and the resin hard core is located between the end portions of the adjacent belt-like bodies. It is an example of a structure formed by fusing materials. b: After a part of the adjacent belt-like bodies are overlapped (laminated), a resin hard core material is fused to at least a laminated portion of the upper belt-like body and the lower belt-like body. This is an example of the structure. c: After a part of the adjacent belt-like bodies are stacked (laminated), the resin hard core material is fused at least partially between the laminated portions of the upper belt-like body and the lower belt-like body. It is an example of the formed structure.

  It is important that the flexible tube material of the present invention is a flexible tube material which is composed of a resin hard core material and a belt-like body, and the resin hard core material and the belt-like body are fused and integrated.

  First, the structure and manufacturing method of the flexible tube of the present invention will be described with reference to FIG.

  FIG. 1 shows a resin rigid core material in which a strip 1 is spirally wound by a pipe making machine 3 in which a large number of rotating rods 2 are uniformly arranged on a cylinder in a state where they are overlapped at a constant pitch or adjacent to each other. 4 is extruded from a die 5 in a molten state, spirally wound in synchronism with the strip through the temperature-controlled stretching zone 6, and immediately cooled with air 7 so that the strip is fused to the resin hard core. The flexible tube material and the manufacturing method thereof will be described. Note that the arrow at the root of the rotating rod 2 indicates the direction of rotation, and the arrow at the strip 1 indicates the direction of feeding and winding.

It is important that the strip 1 constituting the flexible tubular material of the present invention is a nonwoven fabric in which the core portion is made of a polyester resin and the sheath portion is made of a core-sheath fiber made of a resin having a melting point lower than that of the polyester resin. It is.
In the core-sheath type fiber constituting the nonwoven fabric, the fact that the sheath part is a resin having a melting point lower than that of the polyester resin is easy to fuse with the resin hard core material described later, and produces a flexible tube material. This is important because it is easy to set and control manufacturing conditions.
As the resin for the sheath, any resin can be selected as long as it has a melting point lower than that of the polyester resin. However, in view of the light weight and strength characteristics of the obtained flexible tubular material, an olefin resin is preferable. Of the olefin resins, polyethylene resin and polypropylene resin are preferable in consideration of economic efficiency, ultraviolet durability when used outdoors, and oxidation resistance.

  Moreover, it is important for the core part to be made of a polyester resin in order to increase the strength characteristics of duct products such as the obtained flexible pipe material and the sound-absorbing pipe material made of the flexible pipe material. Polyester resins are fragrances such as terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, phthalic acid, α, β- (4-carbophenoxy) ethane, 4,4-dicarboxydiphenyl, 5-sodium sulfoisophthalic acid, etc. Aliphatic dicarboxylic acids such as aliphatic dicarboxylic acids, azelaic acid, adipic acid, sebacic acid or their esters, ethylene glycol, diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, Mention may be made of fiber-forming polyesters composed of diols such as neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol and polytetramethylene glycol, and 80 mol% or more of the structural units are ethylene terephthalate units. Is preferred Yes.

  From the viewpoint of the combination of the core and the sheath, the core-sheath type composite fiber having the polyester resin as the core and the low melting point olefin polymer as the sheath is easy and possible to be fused with the resin hard core. It is preferable in terms of maintaining strength characteristics as a flexible tube material and having good peeling resistance between the core and the sheath.

As for the non-woven fabric, it is possible to select a non-woven fabric obtained by any manufacturing method as long as the desire of the present invention is satisfied. Considering the ease of processing when forming a body, the ease of processing when spirally winding the strip, and further suppressing the oxidative deterioration over time, it is a long fiber nonwoven fabric obtained by the spunbond method It is preferable.
Basis weight of the nonwoven fabric is preferable in that it becomes easy it is to uniformly achieve a spiral of flexible tubing in a range of ^{30g / m 2 ~120g / m 2} . In particular, as will be described later, it is preferable when a flexible tubular material is produced by spirally winding a belt-shaped body made of a nonwoven fabric on a pipe making machine.

As described above, it is important that the belt-like body is made of a non-woven fabric, but it may be made of a non-woven fabric alone, or may be made of a non-woven fabric and another structure. As a preferred example, a belt-like body is constituted by a laminate of a nonwoven fabric and a film. As long as the flexibility as a flexible tube is not impaired, the film may be made of resin, metal, or the like, depending on characteristics required for the flexible tube, such as strength characteristics and light weight characteristics. Although a laminated film made of resin and metal may be used, the film is preferably a resin film when lightness, flexibility, and strength characteristics are required. Moreover, when using a flexible pipe material as an outdoor duct etc., it is preferable that this resin film consists of olefin resin.
Furthermore, the film may be laminated on both sides of the nonwoven fabric, or may be laminated on one side, but when air shielding properties such as oxidation resistance and ultraviolet shielding properties are required, the film is laminated at least on the outside of the nonwoven fabric. It is preferable that
The thickness of the film is not limited as long as it has the function of a flexible tube material. However, when importance is attached to the flexibility as the flexible tube material, the thickness is preferably 100 μm or less.

The resin hard core material constituting the flexible tube material of the present invention is made of an olefin resin or a polyester resin in order to increase the strength characteristics of the flexible tube material, particularly the peel strength between adjacent strips. is important.
More specifically, a hard polyester resin, a hard olefin resin, and the like can be mentioned. A hard olefin resin is preferably used because of its high resin melt viscosity and excellent formability during extrusion.

  And it is important in the meaning which keeps the lightweight property and softness | flexibility of the flexible tube material obtained that both the resin hard core material and a strip | belt-shaped body are wound helically. The angle formed by the longitudinal direction of the strip and the length direction of the flexible tube material is 30 ° to 85 ° to ensure the productivity of the flexible tube material and further ensure the flexibility of the flexible tube material. Preferred above.

Although the width of the belt-like body varies depending on the inner diameter of the flexible tube material, for example, when the inner diameter of the flexible tube material is 100 mm, 10 mm to 30 mm ensures the productivity of the flexible tube material and is flexible. It is preferable in terms of facilitating the uniformity of the flexibility and strength characteristics of the tube.
Furthermore, although the pitch (interval) between the strips in the flexible tube material also varies depending on the inner diameter of the flexible tube member, for example, when the inner diameter of the flexible tube member is 100 mm, it is 10 mm to 30 mm. However, it is preferably used from the viewpoint of shape retention, flexibility, and production stability.

In the flexible tubular material of the present invention, the fused portion between the resin hard core material and the strip is not particularly limited as long as the flexible tubular material has desired characteristics. However, in the cross-sectional structure in the longitudinal direction of the flexible tube material of the fusion part, having the structure shown in a, b, or c of FIG. 3 is sufficient in strength of the fusion part, and The obtained flexible tube is preferable for obtaining flexibility.
FIG. 3a shows a state in which the adjacent strips do not overlap each other including the end portions or the ends of the adjacent strips are in contact with each other between the end portions of the adjacent strips. It is a structure formed by fusing a resin hard core material. It is preferable from the viewpoint of strength characteristics that the resin hard core material is fused to any of the adjacent strips.
FIG. 3b shows that after a part of adjacent strips are stacked (stacked), a resin hard core material is formed at least on the layered portion of the end of the upper strip and the lower strip. It is a structure formed by fusing. It is preferable from the viewpoint of strength characteristics that the hard resin core material is in a state of being fused across the upper band and the lower band.
Further, FIG. 3c shows that after a part of adjacent strips are stacked (stacked), a resin hard core is at least partially between the stacked portions of the upper strip and the lower strip. It is a structure formed by fusing materials.

  As long as the flexible tube material of the present invention satisfies the desired characteristics, its manufacturing method is not limited, but it will be described with reference to FIG. 1 as one form of a preferable manufacturing method. On a pipe making machine consisting of a cylindrical tube and a spring-like rotating rod that is inclined with respect to the tube length direction along the tube surface, the belt-like body is spirally wound, It is preferable to employ a method of bringing the resin hard core material into contact with the melt-extruded resin hard core material and fusing and integrating the resin hard core material and the belt-shaped body, which will be described with reference to FIG.

  The pipe making machine 3 used for manufacturing the flexible pipe material of the present invention is, for example, a large number of tightly wound springs having a smooth surface finished as a rotating rod 2 on a cylinder 13. The rotating rod 2 is individually rotated by a planetary gear or the like. The mechanism in which the pipe-making machine spirally winds the belt-like body is an application of the general characteristic that the belt-like body winds perpendicularly to the rotation direction of the rod-like rotating body. By twisting between the root and the tip and arranging them evenly, the orthogonal force with respect to the rotational direction of each rotating rod is converted into a force that spirally feeds on the cylinder 13.

These hard resin core materials These exemplified hard resin core materials are generally melted and discharged from an extruder at a resin temperature of 200 ° C. to 260 ° C. In consideration of fusing, a temperature exceeding 210 ° C. is not preferable because a sheath made of a polymer having a low melting point is completely melted and absorbed in the core material and the fusing property is impaired. In the present invention, the temperature control stretching zone 6 is provided, and the resin surface temperature is adjusted to 150 ° C. to 210 ° C. by adjusting the distance, and the ambient temperature on the pipe making machine is -5 ° C. to 45 ° C. A strong fusion can be obtained by immediately air-cooling 7 in a work environment.

  Immediate air cooling 7 is intended to harden the hard resin core material while controlling the shrinkage in the pipe on the pipe making machine holding the pipe inner surface, and the unevenness of the inner surface of the flexible pipe material that leads to pressure loss. It is a very preferable process for obtaining the flexible tube material of the present invention because it reduces and exerts the fusion strength.

The air cooling is not particularly limited as long as the above object is achieved, but adopting a method of cooling the air by blowing air onto the flexible tube can reduce the cooling of the flexible tube. It is preferably used because it can be performed efficiently.
The air used for air cooling may be an inert gas such as nitrogen, but it is preferable to use air from the economical aspect. Although the air temperature during air cooling varies depending on the atmospheric temperature (air temperature) at the time of manufacture and the fusion temperature of the hard resin core material, 5 to 20 ° C. facilitates strong expression at the time of fusion. It is preferable at the point made to, and it is more preferable that it is 10 to 15 degreeC.
The air flow rate during air cooling varies depending on the outer diameter of the tube material and the fusion temperature of the hard resin core material, but the strength variation of the tube material that can be obtained at a flow rate of 2 to 50 m ³ per minute and irregularities on the inner surface of the tube material Is preferable, and a flow rate of 6 to 18 m ³ is more preferable.
Furthermore, the air cooling time is preferably 20 seconds or longer from the viewpoint of reducing irregularities on the inner surface of the tube material.

In addition, from the viewpoint that the unevenness of the inner surface of the pipe material can be reduced by performing air cooling on the pipe making machine, it is preferable that the air is cooled on the pipe making machine even after the air cooling 7 is finished.
The cooling on the pipe making machine here may be natural cooling in a so-called room temperature atmosphere. Further, the cooling may be performed while the pipe material moves on the pipe making machine.
The cooling time on the pipe making machine after the end of air cooling is preferably equal to or longer than the air cooling time because it is easy to reduce unevenness on the inner surface of the pipe material.

  The flexible tube material of the present invention is formed by the above-described process and material, is excellent in flexibility and stretchability, is lightweight, easy to handle, and can be formed into a long shape. In use, it is a flexible tube material suitable for air conditioning applications that does not contain volatile oil, does not generate toxic gas during combustion, and has long-term durability such as embrittlement due to oxidative degradation.

  Next, the sound absorbing pipe material of the present invention will be described with reference to FIG.

As shown in FIG. 2, the sound absorbing tube material of the present invention is characterized in that the flexible tube material of the present invention is used as an inner tube, and a sound absorbing material 9 is laminated on the outside of the flexible tube material.
The sound-absorbing material 9 is not particularly limited as long as it is a material having sound-absorbing properties and flexibility. However, from the viewpoint of versatility, low water absorption and hygroscopic properties, shape / strength stability over time, heat insulation performance, etc. A structure made of polyester fiber, a foam made of polyurethane resin, and the like are suitable.

  In the sound absorbing tube material of the present invention, when importance is attached to heat resistance, it is preferable that a covering air blocking layer 10 is further laminated outside the sound absorbing material 9. The covering air blocking layer 10 may be any resin film, metal film, and resin-metal laminated film having a thickness of up to 100 μm which does not impair the flexibility as a flexible tube material. It is optimal to use a low molecular weight polyethylene resin film in consideration of the fact that it does not contain toxic gases during combustion, and that it is easy to process a tube as a structure of a coated air barrier layer.

  The method for producing the sound-absorbing tube material of the present invention is not limited as long as the above laminated structure can be obtained. It is preferable to adopt the method of providing 10 from the viewpoint of simplification of production facilities and economy.

  The winding form of the sound absorbing material around the flexible pipe material that is the inner tube is not particularly limited, and may be spiral winding, sushi winding, or the like. A winding structure is preferred.

  The present invention does not limit the sound-absorbing material and the covering air blocking layer of the flexible sound-absorbing tube material, but proposes an efficient manufacturing method only for the inner tube that is a breathable flexible tube material.

  Examples Next, typical examples of the present invention will be shown, but the present invention is not limited to the following examples.

Example 1
Resin hard core material made of high-density polyethylene (HDPE) is melt-extruded at a discharge port resin temperature of 215 ° C., passed through a temperature-controlled stretch zone of 30 cm, brought to a resin temperature state of about 180 ° C., and in the same direction by a spring with a smooth surface In the pipe making machine in which the rotating rods rotating in the same direction are twisted approximately 5 ° on the cylinder and are evenly arranged, and the distance outside the rotating rod on the diagonal is 108 mm, the polyester resin is the core part. A strip formed by cutting a spunbonded nonwoven fabric having a basis weight of 70 g / m ² made of a core-sheath type composite fiber whose sheath is a low-melting polyolefin having a melting point lower than that of the polyester resin of the core part to a width of 30 mm is formed on the pipe making machine. In the state in which the belt-like body end portions of the first and second circumferences are brought into contact with each other (that is, the distance between the belt-like body end portion of the first week and the belt-like body end portion of the second week is 0 mm), About 180 ℃ The molten resin hard core material consisting of HDPE was wound in a synchronized manner across the abutting part of the belt-like body, and immediately, 20 ° C. air was blown at a flow rate of 12 m ³ / min on the pipe making machine. Contact with the melt of the spiral belt and the resin hard core for 30 seconds to cool the melt, air shutoff with an inner diameter of 105 mmΦ, a pitch of 30 mm, and a width-height of 7 mm x 4 mm A flexible tube of Example 1 having no layer was obtained.

Example 2
Example 1 except that the resin hard core made of high-density polyethylene (HDPE) is synchronized at 215 ° C. in a state of straddling the butt portion of the strip and that the cooling time with the blown air is 10 seconds. In the same manner, a flexible tube material of Example 2 having an air blocking layer having an inner diameter of 100 mmΦ, a pitch of 30 mm, and a width-height of 7 mm × 4 mm was obtained.

Example 3
A low-density polyethylene sheet having a thickness of 30 μm and a spunbonded nonwoven fabric having a basis weight of 70 g / m ² made of a core-sheath type composite fiber in which a polyester resin is a core and a low-melting polyolefin having a lower melting point than the polyester resin of the core is a sheath Are cut in a width of 30 mm and spirally wound on a pipe making machine with the low-density polyethylene sheet as the outside, in the same manner as in Example 1, with an inner diameter of 105 mmΦ, a pitch of 30 mm, and the width of the kamaboko-type core material × A flexible tube material of Example 3 having an air barrier layer with a height of 7 mm × 4 mm was obtained.

Comparative Example 1
A resin hard core material made of polypropylene (PP) is melt-extruded at a discharge port resin temperature of 225 ° C., and is adjusted to a resin temperature state of about 200 ° C. through a temperature-controlled stretching zone of 30 cm, with a basis weight of 70 g / m ^{2 made} of polypropylene fiber. Except that the spunbonded nonwoven fabric is cut into a band-like body with a width of 30 mm, and the resin hard core is synchronized with the band-like body at a resin temperature of 200 ° C., the same as in Example 1, the inner diameter is 103 mmΦ, the pitch is 30 mm, A flexible tube material of Comparative Example 1 having no air blocking layer having a width x height of 7 mm x 4 mm was obtained.

  In order to measure the fusion composite strength of the belt-shaped body adjacent to the resin hard core material in Example 1, Example 2, Example 3 and Comparative Example 1 described above, the flexible tube material is 25 mm wide in the length direction. The core material was cut at 120 mm and pulled at a speed of 100 mm / min, and the core material fused portion fracture strength was measured. The results are shown in Table 1.

  The flexible tube materials of Examples 1 to 3 made based on the present invention are superior to the flexible tube material of Comparative Example 1 in terms of core material fusion bond fracture strength, and in particular, Examples 1 and 3 The flexible tube material showed twice the strength characteristics of the flexible tube material of Comparative Example 1. It has been proved that any of the flexible tubular materials of the examples has sufficient structural strength as a tubular material.

Regarding the inner diameter of the flexible tube, Example 1 and Example 3 have a planned inner diameter of 105 mmΦ, while Example 2 is insufficient in cooling the resin hard core material on the pipe making machine, and the resin hard core. After the material and the non-woven fabric band were joined and fused, the resin hard core material was cooled and crystallized in the open state beyond the pipe making machine, and the inner diameter at the lower part of the resin hard core material became 100 mmΦ. Moreover, although the comparative example 1 was sufficient cooling conditions, internal diameter became 103 mm (PHI) by the temperature and shrinkage | contraction property of PP which is a resin hard core material.
In Example 2 and Comparative Example 1, it was confirmed that not only the inner diameter of the flexible tube material was smaller than the flexible tube materials of Example 1 and Example 3, but also the inside of the tube was uneven due to the inner diameter contraction. . The presence of unevenness in the tube is an undesirable element as a flexible tube from the viewpoint of dust accumulation and pressure loss. On the other hand, it was confirmed that almost no unevenness was present in the tubes of the flexible tube materials of Example 1 and Example 3.

  The flexible pipe materials of Example 1, Example 2, Example 3, and Comparative Example 1 were used as samples, and the difference in state at the test time using a sunshine weather meter was compared as a durability promotion test. The results are shown in Table 2.

In Examples 1 to 3, the shape of the flexible tube was maintained even after 500 hours, but in Comparative Example 1, the nonwoven fabric was embrittled in 300 hours, and in 500 hours, the shape of the flexible tube was It came to collapse.

  Low density polyethylene having a thickness of 100 μm with the flexible tube material of Example 1 and Example 2 wound around the inner tube as a sound-absorbing material using an open cell urethane foam having a thickness of 10 mm as the inner tube, and the outermost layer as an air blocking layer. The tube is covered so as to be in close contact with the sound absorbing material, and three types of sound absorbing test bodies 3m are prepared. As a sound source, 500 Hz and 80 db are transmitted from one end, and sound is generated at the end (the other) 3 m ahead. The pressure was measured and the attenuation difference by three types of flexible pipe materials was measured. The results are shown in Table 3.

  In each of Examples 1 and 2 prepared based on the present invention, it was confirmed that the 35 db sound pressure was attenuated, and it was proved that the sound absorption performance was excellent.

The present invention is a flexible tube material comprising a resin hard core material and a belt-like body, and the resin hard core material and the belt-like body are fused and integrated. (2) The resin hard core material is made of an olefin resin and / or a polyester resin, and (3) the band-shaped body is a polyester resin and the sheath is the polyester. It is a flexible tube material that is a non-woven fabric made of core-sheath fiber that is a resin having a lower melting point than resin, but according to the present invention, it has long-term durability, excellent flexibility and stretchability, and is soft and lightweight. It is possible to provide a flexible tube material that is easy to handle and can be formed into a long shape, does not contain volatile oil, has excellent strength characteristics, and does not generate toxic gas during combustion. Furthermore, it is possible to provide a flexible sound-absorbing tube material by disposing a sound-absorbing material in the outer layer of the tube and providing an air barrier in the outermost layer.
More specifically, both the flexible tube material and the sound absorbing tube material are useful, for example, for a duct hose for a house.

DESCRIPTION OF SYMBOLS 1 Strip | belt-shaped body 2 Rotating rod 3 Pipe making machine 4 Resin hard core material 5 Dice 6 Temperature control extension zone 7 Air cooling 8 Breathable flexible tube material 9 Sound absorbing material 10 Covering air interruption layer

Claims (6)

It is a flexible tube material comprising a resin hard core material and a belt-like body, and the resin hard core material and the belt-like body are fused and integrated, and satisfies all of the following (1) to (3). Flexible tube material characterized.
(1): Both the resin hard core material and the belt-like body are spirally wound.
(2): The resin hard core material is composed of an olefin resin and / or a polyester resin.
(3): The belt-like body is a non-woven fabric made of core-sheath fibers in which the core part is a polyester resin and the sheath part is a resin having a melting point lower than that of the polyester resin.   The flexible tubular material according to claim 1, wherein the belt-like body is a laminate of a nonwoven fabric and a film made of an olefin resin, and the film is located outside the nonwoven fabric.   A sound absorbing tube material in which a sound absorbing material is further laminated on the outside of the flexible tube material according to claim 1.   The sound-absorbing tube material according to claim 3, wherein a covering air shielding layer is further laminated outside the sound-absorbing material.   On a pipe making machine consisting of a cylindrical tube and a spring-like rotating rod that is inclined with respect to the tube length direction along the tube surface, the belt-like body is spirally wound, A flexible tube material manufacturing method in which a body and a melt-extruded resin hard core material are brought into contact with each other to fuse and integrate the resin hard core material and the belt-like body, wherein the resin hard core is melt extruded After the core material is brought into contact with the resin hard core material at a temperature of 160 ° C. to 190 ° C. and fused and integrated with each other, the tube is machined at −10 ° C. to 60 ° C. in an atmosphere. The manufacturing method of the flexible tube material of Claim 1 or 2 which performs a cooling process.   The method for producing a flexible tube material according to claim 5, wherein a gas of -10 ° C to 60 ° C is blown onto the flexible tube material during the cooling treatment.

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