JP2006038174A - Thermal insulation pipe cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long size and thick thermal insulation pipe cover superior in workability at a job site, and superior in a mechanical characteristic and flexibility, without opening a port of a slit port, even if slit work is applied in the shaft direction. <P>SOLUTION: This thermal insulation pipe cover having a slit part in the shaft direction, is composed of a laminated cylindrical body of an inner cylindrical layer formed by mutually joining mutual butted or superposed side edge parts by spirally winding a tape by butting the mutual side edge parts or superposing the mutual side edge parts by a roll of the tape and a roll of a tape adjacent to its tape and an outer cylindrical layer formed by mutually joining the mutual butted or superposed side edge parts by spirally winding the tape by butting the mutual side edge parts or superposing the mutual side edge parts by a roll of the tape wound on the inner cylindrical layer and a roll of the tape adjacent to its tape. Heat treatment is applied when winding the tape. Thus, the long size thermal insulation pipe cover having a uniform shape, having large flexibility and superior in workability without causing interlayer clearance and joining failure and without opening the port of the slit port, can be realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat insulating pipe cover, and more particularly to a long and thick heat insulating pipe cover having good workability on site.

The heat insulating pipe cover is a cylindrical heat insulating body that is attached so as to cover a tubular body such as a pipe (pipe) from the outside so as to cover the outer surface thereof. It is used to keep the refrigerant pipes cool or to keep the pipes through which the thermal fluid flows. The heat insulating pipe cover is often formed of a thick foam material in order to obtain good heat insulating properties.

As a conventional thick heat insulation pipe cover, one side of a wound tape and one side of a tape adjacent to it are abutted with each other, or side edges are overlapped, and the tape is spiraled. A heat insulating pipe cover is disclosed, which is formed as a cylindrical body formed by winding and joining side edges that are butted or overlapped with each other.

JP-A-10-054492

A heat insulating pipe cover in which the above tape is spirally wound has good heat insulating properties and flexibility. Moreover, a long and thick heat insulation pipe cover can be shape | molded efficiently and economically.
However, when slitting is performed along the axial direction of the heat insulating pipe cover, the slit opening formed by slitting may be gradually opened after manufacturing. In particular, this phenomenon becomes more prominent as the outside air temperature where the pipe cover is placed is higher. Since the heat insulating pipe cover having the slit opening requires a great deal of force at the time of construction, the on-site enforcement performance is inferior and sometimes becomes a problem.

Therefore, as a result of intensive studies to solve the above-mentioned problems, the present inventors have formed a tape by spirally winding the tape while performing heat treatment, and joining the butt or overlapped side edges to each other. As a result, it was found that the opening of the slit opening is effectively prevented even when slitting is performed along the axial direction of the heat insulating pipe cover.

That is, the present invention
(1) A tape roll and a tape roll adjacent to each other were butted against each other or overlapped with each other, and the tape was spirally wound and butted or overlapped. The inner cylinder layer formed by joining the side edges to each other, and one turn of the tape wound on the inner cylinder layer and one turn of the adjacent tape are abutted to each other, or the side edges are overlapped. The tape is wound in a spiral manner, and is composed of a laminated cylinder with an outer cylinder layer formed by joining the side edges that are butted or overlapped with each other, and has a slit portion along the axial direction. Insulation pipe cover, heat treatment is performed when winding tape, heat insulation pipe cover,
(2) At least one middle cylinder layer is provided between the inner cylinder layer and the outer cylinder layer, and the middle cylinder layer is adjacent to one turn of the tape wound on the inner cylinder layer or the middle cylinder layer. A cylinder formed by spirally winding the tape and joining the abutted or overlapped side edges with each other so that one side of the tape is abutted against each other or overlapped with each other. In the heat insulation pipe cover formed as a body, the heat insulation pipe cover according to (1), wherein heat treatment is performed when winding the tape,
(3) The heat insulating pipe cover according to (1) or (2), wherein a tape made of a material different from the foamed material is wound or vertically attached to the outside of the laminated cylinder.
Is to provide.

The inner diameter of the heat insulating pipe cover can be arbitrarily set according to the outer diameter of the pipe covered with the heat insulating pipe cover, but is generally in the range of 0.5 inch to 4 inch. The wall thickness is generally in the range of 20 mm to 80 mm, and practically 30 mm to 50 mm. The width and thickness of the tape are not particularly limited as long as the tape can be wound spirally, but a tape having a width in the range of 30 mm to 70 mm and a thickness in the range of 4 mm to 10 mm can be easily wound. The material of the tape is not particularly limited, but it is preferably a foamed plastic with high heat insulation properties. For example, a closed cell foamed polyethylene material is used. More preferably, it is a flame-retardant foamed plastic.

The tape forming each cylindrical layer does not need to be parallel to the tape of the other cylindrical layer. For example, one cylindrical layer tape and the cylindrical layer tape on it may intersect each other. Moreover, the shape, material, color, etc. of the tape forming each cylinder layer are arbitrary, and may be the same as or different from the tape used for the outer cylinder layer, for example.

Wrapping a material different from the foam material, such as an aluminum film, a polyvinyl chloride film, a polyethylene film, etc., preferably an adhesive tape having an adhesive surface on one side, etc. Alternatively, it may be attached vertically or the like in the longitudinal direction to improve waterproofness and unity and improve the appearance. Pasting may be performed on the entire surface or may be performed partially. Moreover, you may use such a tape for the cylinder layer inside a laminated cylinder. The affixing method may be adhesion by an adhesive or adhesion by heat fusion. The cross-sectional shape of the inner hollow portion of the heat insulating pipe cover is arbitrary, and may be, for example, a circle, a triangle, or an ellipse.

A suitable manufacturing method of the heat insulating pipe cover will be described below. First, the tape that becomes the first cylinder layer is spirally wound around a mandrel, and one side edge of the wound tape and one side edge adjacent to the tape are joined together by heat fusion or the like. A typical first tube layer is formed. The second cylindrical layer and subsequent layers are formed in the same manner. When winding the tape, the tape is heat treated. In particular, when the tape made of a material different from the foam material is wound around the outside of the laminated cylindrical body or attached in the longitudinal direction, for example, when the tape is wound, when the tape is heat treated, This is preferable because a heat insulating pipe cover having good surface characteristics can be obtained. As an example of the heat treatment method, there are a method in which hot air is blown onto the tape and a method in which the tape is passed through an annealing apparatus. The heat treatment temperature is preferably equal to or lower than the melting peak temperature of the tape resin. The heat treatment may be performed from one direction or from multiple directions at the same time, but heat treatment on the outer tape surface when wound around the mandrel will stabilize the inner diameter of the heat insulating pipe cover. It is preferable because it is easy and there is no step on the inner surface. The heat treatment needs to be performed at the same time as or immediately before winding the tape around the mandrel. Even if a heat-treated pipe cover is manufactured by winding a tape that has been preheated and cooled to around room temperature around a mandrel, the effect of preventing the opening of the slit opening is small. Further, even if the heat insulating pipe cover is left in a heat treatment facility such as a thermostat after the heat insulating pipe cover is manufactured, the effect of preventing the opening of the slit opening is small.

The formed cylinder layer can be pressed as necessary to ensure a joined state. In order to obtain a heat insulating pipe cover having a predetermined thickness, a multi-layered structure in which a large number of cylindrical layers are laminated so as to have the thickness. As an example of the method of heat-sealing, there is a method in which hot air of a predetermined temperature is blown to the outer surface of the abutting portion between adjacent side edges of one roll.

In another preferable manufacturing method of the heat insulating pipe cover, first, the tape serving as the first cylindrical layer is wound around a mandrel in a spiral shape while being heat-treated. The winding mode is such that the side edges of the wound tape and the adjacent tape are separated from each other, the side edges are butted together, and the side edges are overlapped. Any of the combined modes may be used. Next, the tape serving as the second cylindrical layer is wound while being adhered to the first cylindrical layer with an adhesive or heat-sealing. Except for the case where a tape made of a material different from the foam material is wound around the outside of the laminated tube or attached in a longitudinal direction, etc., heat treatment is also performed when the tape serving as the second tube layer is wound. . As with the first cylinder layer, the winding mode is such that the side edges of the wound tape and the adjacent tape are separated from each other, and the side edges are butted together. Any of the above-described aspect and the aspect in which the side edges are overlapped may be used. In order to heat-seal the tape serving as the second cylinder layer onto the first cylinder layer, for example, immediately before winding the tape serving as the second cylinder layer on the first cylinder layer, the first tape A hot air having a predetermined temperature is blown onto the surface facing the cylindrical layer, and the surface is melted and pressed and pasted.

For the mandrel, for example, a solid rod or a cylindrical pipe is used. The cross-sectional shape of the mandrel is the same as the cross-sectional shape of the hollow part of the heat insulating pipe cover to be manufactured, and is not limited to a circle, but may be a rectangle or a triangle. The tension applied to the tape when winding the tape around the mandrel or cylinder layer varies depending on the tape material, the set tightening strength of the tape during winding, the set mechanical strength of the heat insulating pipe cover, etc. It is preferable that

Next, using a slitting machine having a rotary blade or the like, slit processing is performed along the axial direction of the heat insulating pipe cover formed by the above-described method, thereby forming a slit portion. Slit processing may be performed in-line at the time of pipe cover molding, but it is more preferable to leave it after molding after slitting because there is a tendency for the residual strain to be small and the opening of the slit mouth to be small. . In order to attach the heat insulating pipe cover thus configured to a tubular body such as a pipe, the slit opening is widened so that the tubular body is fitted into the space in the center of the heat insulating pipe cover.

The heat insulating pipe cover obtained by the present invention does not have a slit opening even when slitting is performed along the axial direction, and has a long, thick and mechanical characteristic and is possible with good on-site workability. It is a heat insulating pipe cover with excellent flexibility.

Hereinafter, the present invention will be specifically described with reference to the drawings. In addition, this invention is not limited to the following Example.

Example 1
1 is a partial cross-sectional side view of a thick heat insulation pipe cover of Example 1. FIG. The heat insulating pipe cover 20 of the first embodiment includes a first cylindrical layer 22, and a second cylindrical layer 24, a third cylindrical layer 26, and an exterior 27 made of aluminum tape, which are sequentially formed on the first cylindrical layer 22. Composed.

As will be described later, the first cylindrical layer 22 is formed in a shape in which one tape is continuously wound by winding a tape made of a foam material on a mandrel in a cylindrical shape with a uniform tension without a gap while performing heat treatment. The second cylindrical layer 24 is formed by winding a tape made of a foam material on the first cylindrical layer 22 in a cylindrical shape with a uniform tension without any gaps while spirally performing heat treatment. The third cylindrical layer 26 is formed in a shape in which one tape is continuously wound by winding a tape made of a foam material on the second cylindrical layer 24 in a cylindrical shape with a uniform tension without a gap. ing. In the first cylindrical layer 22, the side edges of the adjacent one turn are joined to each other, and as a result, a spiral joined portion 28 (see FIG. 2) is formed on the outer wall surface. A side edge portion of one turn forming the second cylindrical layer 24 is joined on the center line (spiral) of one turn forming the first cylindrical layer 22 that is the base. . A side edge of one turn forming the third cylindrical layer 26 is also bonded to the second cylindrical layer 24 as a base in the same manner.

The inner diameter of the first cylindrical layer 22 is 32 mm, the outer diameter is 48 mm, the outer diameter of the second cylindrical layer 24 is 64 mm, and the outer diameter of the third cylindrical layer 26 is 80 mm. The tape used has a width of 50 mm and a thickness of 8 mm. The material is a heat-resistant and flame-retardant closed-cell foamed polyethylene material with a density of 33 g / l and a closed-cell ratio of 80 to 90%. It is a range.

FIG. 2 is a schematic perspective view showing the manufacturing apparatus 30 for the heat insulating pipe cover 20. The production apparatus 30 includes a mandrel 32 that rotates at a constant rotational speed and moves forward at a constant speed, and is positioned slightly below the mandrel 32, and first and second heat fusion heaters 34 and 2 that blow hot air toward the mandrel 32, respectively. The heat fusion heater 36, the first heat treatment heater 50 for blowing hot air toward the first tape 38, the second heat treatment heater 51 for blowing hot air toward the second tape 40, and further the first tape 38 and the second tape. 40 and a tape reel (not shown) around which the third tape 42 is wound. The output of each heat treatment heater is 1.5 kW, and the output of each heat fusion heater is 1 kW. The winding start position of the first tape 38 is a position where hot air from the first heat treatment heater 50 is blown, and the winding start position of the second tape 40 is one turn after the position where hot air from the second heat treatment heater 51 is blown, And the position at which the third tape 42 and the aluminum sheet 44 start to be wound are respectively one turn before the position at which the hot air from the second heat fusion heater 36 is blown. And after one roll.

In order to manufacture the heat insulating pipe cover 20 of the present embodiment, the first tape 38, the second tape 40 and the third tape 42 each made of foamed plastic tape of the same material, and the aluminum tape 44 having a one-side adhesive surface are used. First, as shown in FIG. 2, the first tape 38 is wound around the mandrel 32 while being heat-treated by the first heat treatment heater 50 while the mandrel 32 is rotated at a constant rotational speed and is advanced. When the first tape 38 is wound, the first tape 38 is spirally wound around the mandrel 32 so that there is no gap between adjacent wounds and no overlap. Also, hot air is blown from the surface to the butted portion 48 of the side edge portion of the one turn 45 and the adjacent one turn 46 by the heat fusion heater 34 to melt the side edge portion, and heat fusion is performed. A joint portion 28 is formed. Thereby, the 1st cylindrical layer 22 of the shape where each winding was continued is formed. The tension applied to the first tape 38 when forming the first cylindrical layer 22 may be a tension that does not loosen the tape.

While forming the first cylindrical layer 22 with the mandrel 32 as an axis, the second tape 40 is formed on the outer surface of the formed first cylindrical layer 22 at the same time as the first tape 38 as shown in FIG. Winding is performed while performing heat treatment with the heat treatment heater 51. At that time, the side edge of one turn formed by the second tape 40 is wound so as to be positioned along the center line of the first tape 38 on which the first cylindrical layer 22 is formed. While rotating, the second tape side edge is melted simultaneously with the first tape side edge by the first heat fusion heater 34, and the first cylindrical layer 22, the second tape 40, and the side edge of the second tape 40 are melted. Heat-seal together. The heat-sealed second tape 40 forms the second cylindrical layer 24. The formation of the third cylindrical layer 26 is the same as that of the second cylindrical layer 24 except that no heat treatment is performed, and the third tape 42 is wound around the outer surface of the second cylindrical layer 24, Hot air is blown by the second heat-sealing heater 36 to the abutting portion of the side edge portion with the adjacent one roll, and the side edge portions are heat-sealed. If heat treatment is performed when the third tape 42 is wound around the outer surface of the second cylindrical layer 24, unevenness may occur on the surface of the exterior 27, which is not preferable. The exterior 27 is formed by using an aluminum tape 44 and winding and attaching the adhesive surface with the third cylindrical layer 26 side.

When forming the 1st cylindrical layer 22, the 2nd cylindrical layer 24, and the 3rd cylindrical layer 26, it does not necessarily need to join by heat sealing | fusion, For example, you may join by an adhesive agent. Further, after the formation of the third cylindrical layer 26, the aluminum tape 44 may be attached in the longitudinal direction of the heat insulating pipe cover, that is, vertically attached. If necessary, a roller (not shown) that presses the formed heat insulation pipe cover 20 may be provided at an appropriate position so that the heat insulation pipe cover 20 is pressed so that the joining and molding become more complete.

As described above, after the heat insulation pipe cover 20 is formed on the mandrel 32, the heat insulation pipe cover 20 is pulled out from the mandrel 32. Alternatively, after the heat insulating pipe cover 20 is formed, the mandrel 32 can be pulled out from the formed heat insulating pipe cover portion. In addition, it is good to adjust beforehand the tension | tensile_strength at the time of winding a foam tape so that extraction of the heat insulation pipe cover 20 becomes easy.

After separating the mandrel 32 and the heat insulating pipe cover 20, the heat insulating pipe cover 20 is naturally cooled to room temperature. Next, the heat insulating pipe cover 20 is slit using a slitting machine having a rotary blade.

The heat insulation pipe cover 20 of Example 1 has the following advantages.
(1) Unlike conventional heat insulation pipe covers where the product dimensions are limited by the size of the foam material, the heat insulation pipe cover having the desired thickness and the desired length is continuously formed using a simple manufacturing device. Can do.
(2) Since the tape is spirally wound for each cylindrical layer, no gap is generated between the cylindrical layers. Further, it is possible to variously combine tape materials, colors, dimensions, etc. for each cylindrical layer. Moreover, wrinkles do not occur unlike the conventional multilayer insulation pipe cover. Further, the tape side edge can be shifted to an arbitrary position in the longitudinal direction so that the tape side edge is not located at the same position between the cylindrical layers.
(3) A long heat insulating pipe cover can be continuously manufactured with a small number of manufacturing steps using a simple manufacturing apparatus. Moreover, since a mandrel is used, a heat insulating pipe cover having a desired wall thickness and a constant inner diameter can be manufactured. In addition, it is possible to manufacture a heat insulating pipe cover with different wall thickness using the same mandrel. Furthermore, a mold that has been conventionally required is not necessary.
(4) The opening of the slit opening is small and the workability on site is good.

FIG. 1A is a partial cross-sectional view of a heat insulating pipe cover according to the first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line I-I in FIG. It is a plane explanatory view showing an embodiment of Example 1 of the present invention.

20 Heat Insulating Pipe Cover 22 of Example 1 First Cylindrical Layer 24 Second Cylindrical Layer 26 Third Cylindrical Layer 27 Exterior 28 Joint 30 Manufacturing Device 32 Mandrel 34 First Thermal Fusion Heater 36 Second Thermal Fusion Heater 38 First Tape 40 Second tape 42 Third tape 44 Aluminum tape 45 One turn 46 One turn 48 Abutting portion 50 First heat treatment heater 51 Second heat treatment heater

Claims (3)

One side of the tape and one side of the tape adjacent to each other are abutted with each other, or the side edges are overlapped with each other, and the tape is spirally wound and the side edges are abutted or overlapped. The inner cylinder layer formed by joining each other, and one turn of the tape wound on the inner cylinder layer and one turn of the tape adjacent thereto are abutted with each other, or the side edges are overlapped with each other. A heat insulating pipe cover having a slit portion along the axial direction. The heat insulating pipe cover is formed of a laminated cylindrical body with an outer cylinder layer formed by spirally winding a tape and joining the butted or overlapped side edges to each other. A heat insulating pipe cover, wherein heat treatment is performed when the tape is wound. At least one middle cylinder layer is provided between the inner cylinder layer and the outer cylinder layer, and the middle cylinder layer is wound on the inner cylinder layer or the middle cylinder layer and one tape adjacent thereto. Formed as a cylindrical body in which the tape is spirally wound and the side edges that have been butted or overlapped are joined together so that the side edges are overlapped or overlapped with each other The heat insulation pipe cover according to claim 1, wherein the heat insulation pipe cover is heat-treated when the tape is wound. The heat insulating pipe cover according to claim 1 or 2, wherein a tape made of a material different from the foamed material is wound or vertically attached to the outside of the laminated cylindrical body.

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