JPH1054492A - Heat insulating pipe cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-sized heat insulating pipe cover having the desired thickness and the uniform shape, and able to be economically manufactured. SOLUTION: A heat insulating pipe cover 100 is constituted of a first cylindrical layer 102, and a second cylindrical layer 104 and a third cylindrical layer 106 which are sequentially formed on the first cylindrical layer 102. The first cylindrical layer is formed into a cylindrical shape by spirally winding a foam tape on a mandrel by uniform tension in a state where the side edges of the foam tape are approximately abutted each other, the second cylindrical layer is formed into a cylindrical shape by winding the foam tape on the first cylindrical layer, and the third cylindrical layer is formed into a cylindrical shape by winding the foam tape on the second cylindrical layer. The foam tape for constituting the second cylindrical layer is heat-welded on the first cylindrical layer, and the foam tape for constituting the third cylindrical layer is heat- welded on the second cylindrical layer. Therefore, a long-sized heat insulating pipe cover having the uniform shape, large flexibility, no clearance between the layers, no inferior heat-welding, and good integrality can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating pipe cover, and more particularly to a heat-insulating pipe cover which is long, thick and economical to form.

[0002]

2. Description of the Related Art A heat-insulating pipe cover is a tubular heat-insulating body which is attached to an outer surface of a pipe (pipe) or the like so as to insulate it from the outside. It is used for keeping the cooling of the refrigerant piping between the piping and the refrigeration equipment or for keeping the temperature of the piping 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.

Incidentally, there are the following types of conventional thick-walled heat insulating pipe covers. The first type is a multilayer heat-insulated pipe cover composed of a multilayer foam pipe. When manufacturing a multilayer heat insulating pipe cover, first, the foam material sheet is cut into a predetermined width to form a strip-shaped sheet, and then the strip-shaped sheet is formed into a cylindrical shape while being rolled through a molding die. Butt the edges, heat fusion,
A cylindrical body 10 as shown in FIG. 12 is formed. Subsequently, another cylindrical body is similarly formed on the outer surface of the cylindrical body 10 to form a heat insulating pipe cover composed of two layers of cylindrical bodies. This is repeated until a predetermined thickness is obtained, thereby producing a heat insulating pipe cover having a predetermined thickness. The second type is a rolled heat insulating pipe cover, which is formed by winding a foamed material sheet around a cylindrical core (for example, a rigid paper core) in a rolled shape. The third type is formed by directly shaving the tubular body of the heat insulating pipe cover from the foam material block,
It is a cut-out type insulated pipe cover.

[0004]

However, the above-mentioned conventional heat insulating pipe cover has the following problems. First,
Regarding the multi-layer heat insulating pipe cover, firstly, when trying to manufacture a thick multi-layer heat insulating pipe cover, the shape becomes uneven. When manufacturing a multilayer heat-insulating pipe cover, the strip-shaped sheet is forcibly rolled with a mold, molded, and heat-sealed to form a cylindrical body. Becomes thicker. As a result, the heat-insulating pipe cover of the product has a quality problem that the shape and the wall thickness are not uniform, and has poor flexibility. Second, the strength is low. It is necessary to cut the strip-shaped sheet forming each cylindrical layer into a width equal to the inner circumference or the outer circumference of each cylindrical layer at the time of molding, but it is difficult to cut the strip-shaped sheet exactly to that width. As a result, a gap is easily generated between the cylinder layers. Further, since it is difficult to cut the edge of the strip-shaped sheet in a straight line, a gap is generated between the edges at the abutting portion of the sheet to be heat-sealed, so that a portion that is not sufficiently fused may occur. There is also a problem that the mechanical strength is inferior. Third,
Material costs and processing costs increase. In the outermost layer and the layers close to the outermost layer, the width of the strip-shaped sheet needs to be largely cut, and as a result, waste of material increases. For example, the width of a strip-shaped sheet forming a cylindrical layer having an outer diameter of 170 mm is 53
It is 4 mm, and only one piece is cut out from a 1 m wide foam sheet, and the remaining 466 mm wide foam sheet is wasted.

[0005] In the case of the heat-insulated pipe cover, firstly, there is a step at the beginning and end of winding, which results in an uneven shape. Secondly, since it is difficult to form a long one by a self-winding method, a long heat insulating pipe cover cannot be manufactured. For example, at present, about 1 m is the limit. Third, since it is impossible to use sheets of different materials for each cylinder layer, it is difficult to variously change the characteristics of the heat insulating pipe cover to desired specifications. Further, the cut-out heat-insulated pipe cover has a problem that the cut-out remaining foam material block is wasted, so that the material cost is increased, the cut-out processing cost is high, and the economy is low.

[0006] As described above, the conventional heat insulating pipe cover has not been satisfactory in terms of quality and economy. SUMMARY OF THE INVENTION An object of the present invention is to provide a long heat insulating pipe cover having a desired thickness and a uniform shape, which can be formed economically.

[0007]

In order to achieve the above object, a heat insulating pipe cover according to the present invention (described as a first invention).
The side of the wound tape and one turn of the adjacent tape abutting each other side edges, or so that the side edges overlap each other, winding the foam material tape spirally,
In addition, it is characterized by being formed of a cylindrical body formed by joining butted or superposed side edges to each other.

The inner diameter of the heat insulating pipe cover can be set arbitrarily according to the outer diameter of the pipe covered by the heat insulating pipe cover.
Typically, it is in the range of 0.5 inches to 4 inches. The wall thickness is generally 20 mm to 80 mm, and practically 30 mm to 50 mm.
mm range. The width and thickness of the foam tape are not particularly limited as long as they can be spirally wound.
It is easy to wind a tape in the range of mm and the thickness in the range of 4 mm to 10 mm. The material of the foam tape is not particularly limited as long as it is a foamed plastic having high heat insulation. For example, a closed-cell foamed polyethylene material is used. Preferably, it is a flame-retardant foamed plastic. The configuration of the foam tape described above is not limited to the first invention, but is the same in the second and third inventions described below. In addition, the tape referred to in the following description refers to a tape made of a foam material unless otherwise specified. According to the first invention, a portion where one turn and one turn adjacent to each other are joined is formed, so that a heat insulating pipe cover having a stable and uniform shape, high strength, and high flexibility is realized. I do.

In order to achieve the above object, another heat insulating pipe cover according to the present invention (hereinafter referred to as a second invention).
The side of the wound tape and one turn of the adjacent tape abutting each other side edges, or so that the side edges overlap each other, winding the foam material tape spirally,
And a laminated cylindrical body of an outer cylindrical layer formed by joining butted or superposed side edges to each other and at least one inner cylindrical layer formed by spirally winding a foam tape. And

The inner surface of one cylindrical layer constituting the laminated cylindrical body and the outer surface of the lower cylindrical layer are connected to each other by, for example, thermal fusion between the inner surface of the outer cylindrical layer and the outer surface of the inner cylindrical layer therebelow. It does not matter whether or not it is joined. Preferably, by joining one cylinder layer of the inner cylinder layer and the cylinder layer thereon,
The integrity of the heat insulating pipe cover can be more firmly secured. In the inner cylinder layer, one winding of the wound tape and one winding of the adjacent tape are such that the side edges are separated from each other, the side edges are abutted, and the side edges are overlapped. Any of the embodiments described above may be used.

When the inner surface of one tubular layer constituting the laminated tubular body and the outer surface of the underlying tubular layer are joined by heat sealing or the like, it is not always necessary to use a foam tape formed of the tubular layer. Butted or superposed side edges need not be joined together. That is, another heat-insulating pipe cover according to the present invention (hereinafter referred to as a third invention) is a mode in which the side edges of a wound tape and a neighboring tape are separated from each other. A first tubular layer formed by spirally winding a foam tape in one of a mode in which the side edges are abutted with each other and a mode in which the side edges are superimposed, and one winding of the wound tape In one of the mode in which the side edges of a single winding of the tape adjacent thereto are separated from each other, the mode in which the side edges are abutted with each other, and the mode in which the side edges are superimposed, the foamed material tape is used. It is characterized by comprising a laminated cylindrical body with a second cylindrical layer joined to the first cylindrical layer while being spirally wound on the first cylindrical layer.

In the third invention, the tape constituting the second cylinder layer may be bonded to the first cylinder layer by heat fusion or by an adhesive. Also, regarding the size of the joining surface, it is not necessary to join the foam material tape forming the second tubular layer to the surface of the first tubular layer over the entire surface, as long as the integrity of the laminated tubular body can be maintained. A part in the width direction of the foam tape forming the second cylinder layer may be joined to the surface of the first cylinder layer in the longitudinal direction. The number of layers of the laminated cylindrical body is not limited, and may be a laminated cylindrical body of three or more layers. In this case, the lower layer is the first cylindrical layer, and the upper layer is the second cylindrical layer. And

In the second and third inventions, the tape forming each cylinder layer does not need to be parallel to the tapes of the other cylinder layers. For example, the tape of one cylinder layer and the cylinder on it The layers may intersect with the tape. The shape, material, color and the like of the tape forming each cylindrical layer are arbitrary, and may be the same as, for example, the tape used for the outer cylindrical layer, or may be different from each other.

In the heat-insulating pipe cover according to the second or third aspect of the present invention, an exterior tape made of a material different from a foam material, for example, an aluminum film, a polyvinyl chloride film, a polyethylene film, etc., is provided outside the laminated cylindrical body. Preferably, for example, a pressure-sensitive adhesive tape having a pressure-sensitive adhesive surface on one side may be wound or attached longitudinally in the longitudinal direction or the like to improve waterproofness and integrity and improve appearance. The attachment may be performed on the entire surface or partially. Further, such a tape may be used for a tubular layer inside a laminated tubular body. The bonding method may be bonding with an adhesive or bonding 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 preferred method of manufacturing the heat insulating pipe cover will be described below. First, while winding the tape to be the first cylindrical layer spirally around the mandrel, one side edge of the wound tape and one side edge adjacent thereto are joined by heat fusion or the like, An integral first cylindrical layer is formed. The second and lower cylindrical layers are formed in the same manner. If necessary, the formed cylindrical layer can be pressed to ensure the bonding state. In order to form a heat insulating pipe cover having a predetermined thickness, a multi-layered structure in which a plurality of cylindrical layers are stacked to have the desired thickness is adopted. As an example of the method of heat fusion, there is a method of blowing hot air of a predetermined temperature to an outer surface of a butt portion between adjacent one-turn side edges.

In another preferred method of manufacturing the heat insulating pipe cover, first, the tape to be the first tubular layer is spirally wound around a mandrel. The winding mode is a mode in which the side edges of one winding of the wound tape and one winding of the adjacent tape are separated from each other, a mode in which the side edges are abutted with each other, and a side edge is overlapped. Any of the combined embodiments may be used. Next, the tape to be the second cylinder layer is wound on the first cylinder layer while being bonded to the first cylinder layer with an adhesive or thermally fused. As in the case of the first tubular layer, the winding is performed in such a manner that the side edges of one winding of the wound tape and one winding of the adjacent tape are separated from each other, and the side edges are butted together. Or an embodiment in which the side edges are overlapped with each other. In order to heat-bond the tape to be the second cylinder layer on the first cylinder layer, for example, immediately before winding the tape to be the second cylinder layer on the first cylinder layer, Hot air of a predetermined temperature is sprayed on the surface facing the cylindrical layer of the above to press and adhere while melting the surface.

For the mandrel, for example, a solid rod or a tubular pipe is used. The cross-sectional shape of the mandrel is the same as the cross-sectional shape of the hollow portion of the heat-insulating pipe cover to be manufactured, and is not limited to a circle, but may be a rectangle as shown in FIG. 10 or a triangle as shown in FIG. The tension applied to the tape when winding the tape around the mandrel or cylinder layer,
The material of the tape, the set tightening strength of the tape during winding,
Since it differs depending on the set mechanical strength of the heat-insulating pipe cover, it is preferable to determine the heat-insulating pipe cover in advance by experiments or the like.

The heat insulating pipe cover according to the present invention has the following advantages as compared with the conventional heat insulating pipe cover.
(1) Since the dimensions and the shape are uniform in the radial direction and the longitudinal direction of the heat insulating pipe cover, the heat insulating properties and the mechanical strength of the heat insulating pipe cover are uniform in the longitudinal direction and the radial direction. In particular, in the third aspect, since the tubular layer is joined to the tubular layer, it is easy to maintain the integrity of the entire heat-insulating pipe cover, and the flexibility is high. (2) Since there is no gap between the tubular layers, strong integrity can be ensured, and wrinkles are unlikely to occur as in the conventional multilayer heat insulating pipe cover.
(3) Since each tubular layer can be formed with tapes of different materials, various designs are provided for the properties of the heat-insulating pipe cover, including the heat-insulating properties, mechanical properties such as bending, shearing and pulling, and flexibility. Becomes possible. (4) When the heat insulating pipe cover is bent, one turn absorbs the contraction in the part bent inward and one turn extends in the part bent outward, so that the flexibility is great. In particular, when adjacent turns are not joined, flexibility is further increased. (5) Since the cylindrical layer is formed by winding the tape, a long heat insulating pipe cover having a desired length can be easily manufactured. (6) Since no material is wasted, the material cost is reduced, and since no mold is required, the manufacturing cost is low.

[0019]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 Embodiment 1 is an example of the second invention. FIG. 1 shows the first embodiment.
3 is a partial cross-sectional side view of the thick heat-insulating pipe cover of FIG. The heat insulating pipe cover 20 of the first embodiment includes a first cylindrical layer 22,
Second cylindrical layer 2 sequentially formed on first cylindrical layer 22
4, a third cylindrical layer 26 and an exterior 27 made of aluminum tape.

The first cylindrical layer 22, the second cylindrical layer 24 and the third
As described later, each of the cylindrical layers 26 has a tape made of a foam material on a mandrel, and the first cylindrical layer 22 has
Further, it is spirally wound with a uniform tension spirally on the second cylindrical layer 24 with no gap, and is formed in a shape in which one turn is continuous. In the first cylindrical layer 22, the side edges of one turn adjacent to each other are joined to each other, and as a result, a spiral joint 28 (see FIG. 2) is formed on the outer wall surface. Second
The side edge portion of one turn forming the cylindrical layer 24 is joined thereon along the center line (spiral) of one turn forming the first cylindrical layer 22 which is the base. Third cylindrical layer 26
Is also joined on the second cylindrical layer 24 as the base in the same manner.

The first cylindrical layer 22 has an inner diameter of 32 mm and an outer diameter of 4 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 shape of the tape used is
The width is 50mm and the thickness is 8mm. The material is heat-resistant and flame-retardant closed-cell foamed polyethylene, and the density is 33g /
l, the closed cell rate is in the range of 80-90%.

FIG. 2 is a schematic perspective view showing an apparatus 30 for manufacturing the heat insulating pipe cover 20. The manufacturing device 30 is a mandrel 3 that moves forward at a constant speed while rotating at a constant rotation speed.
2, a first heat fusion heater 34 and a second heat fusion heater 36 which are located slightly below the mandrel 32 and blow hot air toward the mandrel 32, respectively, and further, a first tape 38, a second tape 40 and And a tape reel (not shown) around which the third tape 42 is wound. The output of each heat fusion heater is 1 kW. The winding start position of the second tape 40 is a position where the hot air from the first heat fusion heater 34 is blown, and the third tape 4 is wound.
The winding start positions of the second sheet 2 and the aluminum sheet 44 are one turn before and one turn after the position where the hot air from the second heat fusion heater 36 is blown, respectively.

In order to manufacture the heat insulating pipe cover 20 of this embodiment, a first tape 38, a second tape 40 and a third tape 42, each made of a foamed plastic tape of the same material, and an aluminum tape 44 having an adhesive surface on one side. First, as shown in FIG. 2, the first tape 3 is advanced while rotating the mandrel 32 at a constant rotation speed and moving forward.
8 is wound around the mandrel 32. When winding the first tape 38, the first tape 38 is spirally wound around the mandrel 32 so that there is no gap between the adjacent wound turns and no overlap. Further, hot air is blown from the surface to the butted portion 48 of the side edge portion between the one turn 45 and the adjacent one turn 46 by the heat fusion heater 34 to melt the side edge portion, and heat-fused to form a spiral shape. A joint 28 is formed. Thus, the first cylindrical layer 22 having a shape in which one turn is continuous is formed. The tension applied to the first tape 38 when forming the first cylindrical layer 22 may be a tension that does not cause the tape to loosen.

The first cylindrical layer 2 having the mandrel 32 as an axis
At the same time, the second tape 40 is wound around the outer surface of the formed first cylindrical layer 22 in the same manner as the first tape 38, as shown in FIG. At this time, the winding is performed so that the side edge of one winding formed by the second tape 40 is located along the center line of the first tape 38 on which the first cylindrical layer 22 is formed, and is positioned thereon. While rotating, the second tape side edge is melted simultaneously with the first tape side edge by the first heat-sealing heater 34, and the first cylindrical layer 22 and the second tape 40, and the side edge of the second tape 40 are melted. The two are heat-sealed. The heat-sealed second tape 40 forms the second cylindrical layer 24. Third
The formation of the cylindrical layer 26 is the same as that of the second cylindrical layer 24,
The third tape 42 is wrapped around the outer surface of the second cylindrical layer 24, and hot air is blown by the second heat fusion heater 36 to the abutting portion of the side edge of one turn of the third tape and an adjacent turn of the third tape. The parts are formed by heat fusion. The exterior 27 is formed by winding and attaching an aluminum tape 44 with the adhesive surface facing the third cylindrical layer 26. First cylindrical layer 22, second
When the cylindrical layer 24 and the third cylindrical layer 26 are formed, they need not necessarily be joined by heat fusion, but may be joined by, for example, an adhesive. 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. A roller (not shown) that presses the formed heat insulating pipe cover 20 as necessary.
May be provided in place to press the heat-insulating pipe cover 20 so that joining and forming are more complete.

After the heat insulating pipe cover 20 is formed on the mandrel 32 as described above, the heat insulating pipe cover 20 is pulled out from the mandrel 32. Alternatively, after forming the insulated pipe cover 20, the mandrel 32 may be withdrawn from the formed insulated pipe cover portion. Note that the tension at the time of winding the foam tape may be adjusted in advance so that the heat insulating pipe cover 20 can be easily pulled out.

The heat insulating pipe cover 20 of the first embodiment has the following advantages. (1) Unlike conventional heat-insulating pipe covers whose product dimensions are limited by the dimensions of the foam material, continuous formation of heat-insulating pipe covers of a desired thickness and a desired length using a simple manufacturing device. Can be. (2) Since the tape is spirally wound for each cylindrical layer, no gap is generated between the cylindrical layers. Also,
Various combinations of tape materials, colors, dimensions, etc. can be made for each cylindrical layer. Also, wrinkles do not occur unlike the conventional multilayer heat insulating 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 respective cylindrical layers. (3) Using a simple manufacturing device, with a small number of manufacturing steps,
It is possible to continuously manufacture long heat-insulated pipe covers. Also,
Since the mandrel is used, a heat insulating pipe cover having a desired thickness and a constant inner diameter can be manufactured. In addition, a heat insulating pipe cover having a different thickness can be manufactured with the same mandrel. Furthermore, the mold which has been required conventionally becomes unnecessary.

Embodiment 2 Embodiment 2 is an embodiment of the heat insulating pipe cover of the third invention, in which the side edges of the foam tape are separated from each other. FIG. 3 is a side sectional view of a thick-walled heat-insulating pipe cover according to the second embodiment. Insulated pipe cover 50 of Embodiment 2
Are a first cylindrical layer 52 having the same configuration as the first cylindrical layer 22 of the first embodiment, and a second cylindrical layer 54, a third cylindrical layer 56, and a fourth cylindrical layer 58 formed sequentially on the first cylindrical layer 52. It is composed of The first cylindrical layer 52 is formed in the same manner as the first cylindrical layer 22 of the first embodiment. Second cylindrical layer 54 and fourth cylindrical layer 5
8 is the same second tape 68 as the tape used in the first embodiment.
And a fourth tape (not shown).
6 is formed of the same third tape 70 as the second tape 68 except that the width is 1.6 times the width of the second tape 68.

The second cylindrical layer 54 is formed on the second tape 6 so as to form an interval having the same width as one turn between adjacent turns.
8 is spirally wound on the first cylindrical layer 52. The third cylindrical layer 56 has one turn of 1 / wind between adjacent turns.
The third tape 70 is used to form a space four times as wide as the second tape.
It is spirally wound on the cylindrical layer 54. The fourth cylindrical layer 58 is formed by spirally winding a fourth tape on the third cylindrical layer 56 so that there is no gap between adjacent one windings and no overlap. The first cylindrical layer and the second cylindrical layer, and the second cylindrical layer and the third cylindrical layer are bonded to each other.

FIG. 4 is a schematic perspective view showing an apparatus 60 for manufacturing the heat insulating pipe cover 50. The manufacturing apparatus 60 includes a mandrel 62, a first heat fusion heater (not shown) for blowing hot air toward the mandrel 62, a second heat fusion heater 64, a third heat fusion heater 66, and a fourth heat fusion heater. And an arrival heater (not shown). Insulated pipe cover 5
0 is different from the heat insulating pipe cover 20 of the first embodiment in which each cylindrical layer is wound in one step, and the first step of forming the first cylindrical layer 52, and then the second cylindrical layer 54
And a second step of simultaneously forming the third cylindrical layer 56 and a third step of forming the fourth cylindrical layer 58.

Next, a method of manufacturing the heat insulating pipe cover 50 will be described with reference to FIG. First, as in the first embodiment, a first step of forming the first cylindrical layer 52 is performed.
Next, as a second step, as shown in FIG. 4, the second step is performed while maintaining the same width as one turn between adjacent turns.
A tape 68 is spirally wound on the first cylindrical layer 52.
At this time, the inner surface layer of the second tape 68 is melted by the second heat fusion heater 64, and the second tape 68 is placed on the first cylindrical layer 52.
Is heat-sealed. The heat-sealed second tape 68 forms the spiral second cylindrical layer 54. Simultaneously with the winding of the second tape 68, the inner surface layer of the third tape 70 is melted by the heat sealing heater 66 while the third tape 70 is wound on the outer surface of the second cylindrical layer 54, and the heat is applied on the second cylindrical layer 54. Let it fuse. At this time, the third tape 70 is set on the separated portion of the second cylindrical layer 54. Thereby, the first cylindrical layer 5
2, an air layer 72 (see FIG. 3) is formed by the second cylindrical layer 54 and the third cylindrical layer 56. Also, the third cylindrical layer 56
Has a space that is 1/4 the width of the second tape 68 between adjacent turns as described above. Then the third
As a process, while a fourth tape (not shown) is spirally wound on the third cylindrical layer 56 so that there is no gap between adjacent one windings, the fourth tape is formed in the same manner as the first cylindrical layer 52.
The fourth cylindrical layer 58 is formed by a heat fusion heater. At this time, the second cylindrical layer 54, the third cylindrical layer 56, and the fourth cylindrical layer 5
8 forms an air layer 74 (see FIG. 3). still,
The width of the tape used to form the second cylindrical layer 54 need not be strictly uniform, but may be substantially the same. The same applies to the third cylindrical layer 56. If necessary, a roller (not shown) for pressing the formed heat insulating pipe cover 50 may be provided at an appropriate position.

The effect of the second embodiment is that, in addition to the effects (1) to (3) of the first embodiment, the heat insulating pipe cover has a reduced material cost and a reduced weight while maintaining good heat insulation by the air layer. Can be realized.

Embodiments 3 to 7 below are examples of the first invention, in which a portion where one turn and one turn which are adjacent to each other are joined is formed, and a heat insulating pipe cover having a stable shape is realized. Third Embodiment FIG. 5 is a perspective view of a heat insulating pipe cover of a third embodiment.
The heat-insulating pipe cover 75 according to the third embodiment includes only one heat-insulating pipe core 76 and a cylindrical layer 78 spirally wound thereon. To manufacture the heat-insulating pipe cover 75, first, only one heat-insulating pipe core 76 is manufactured from a foam material sheet in the same manner as the conventional multilayer heat-insulating pipe cover. Next, a cylindrical layer 78 is formed in the same manner as in the first embodiment by using a heat insulating pipe cover 76 instead of the mandrel 32. A cylindrical layer may be further formed on the cylindrical layer 78.
This is the same in the following embodiments 4 to 7.

Fourth Embodiment FIG. 6 is a side sectional view of a heat insulating pipe cover according to a fourth embodiment. The heat insulating pipe cover 80 according to the fourth embodiment uses a tape C having a parallelogram in cross section as shown in FIG. 6A instead of the first tape 38 used in the first embodiment. Are provided at the side edge surfaces.

Fifth Embodiment FIG. 7 is a side sectional view of a heat insulating pipe cover of a fifth embodiment. In the heat insulating pipe cover 82 of the fifth embodiment, instead of the first cylindrical layer 22 of the first embodiment, the side edges of the first tape 38 are overlapped and heat-sealed.

Sixth Embodiment FIG. 8 is a side sectional view of a heat insulating pipe cover according to a sixth embodiment. The heat-insulating pipe cover 84 of the sixth embodiment is a conical heat-insulating pipe cover, in which the tape A of the first embodiment is wound conically, and one overlapping portion is joined by heat fusion. It is also possible to use the heat insulation pipe itself at the pipe end or the like.

Embodiment 7 FIG. 9 is a perspective view of a heat insulating pipe cover of Embodiment 7.
The heat insulating pipe cover 88 of the seventh embodiment includes a first cylindrical layer (not shown in FIG. 9) having the same configuration as that of the first embodiment, and a first tape 92 having different colors on the first cylindrical layer. 2 tape 94
(For example, the first tape is red and the second tape is white) and the second cylindrical layer 90 having a stripe pattern formed by winding the same at the same time. A stripe pattern may be formed using a first tape and a second tape which are made of different materials. This makes it possible to form a heat insulating tube having a stripe pattern of different colors, and it can be used as a cushion material for preventing danger of a pole.

Embodiment 8 This embodiment is another embodiment of the heat insulating pipe cover of the third invention, in which the side edges of the foam tape are abutted against each other. FIG. 13A is a partial cross-sectional side view of the heat insulating pipe cover of this embodiment, and FIG. 13B is a line III-III.
FIG. Insulated pipe cover 100 of the present embodiment
Is composed of a first cylindrical layer 102, a second cylindrical layer 104 and a third cylindrical layer 106 sequentially wound on the first cylindrical layer 102, and have the same dimensions as in the first embodiment. The foam tape constituting each of the cylindrical layers 102, 104 and 106 is the same foam material tape as the foam tape constituting the heat insulating pipe cover 20 of the first embodiment.

The first cylindrical layer 102 is formed in a cylindrical shape by spirally winding a foam tape on a mandrel with uniform tension in such a manner that the side edges of the foam tape are substantially butted against each other. Similarly, the second cylindrical layer 104 and the third cylindrical layer 104
The cylindrical layer 106 is also formed by spirally winding the foam tape on the first cylindrical layer 102 and the second cylindrical layer 104 with uniform tension in such a manner that the side edges of the foam tape are substantially abutted with each other. , Are formed in a cylindrical shape. In addition, the first cylindrical layer 102, the second cylindrical layer 104, and the third cylindrical layer 10
6 are side edges 108, 11 of the foam tape, respectively.
0 and 112 are wound so that they do not come to the same position.

In this embodiment, instead of joining the side edges of adjacent one turns of each of the first, second and third cylindrical layers 102, 104 and 106 as in Embodiment 1, The foam material tape constituting the cylindrical layer 104 is the first cylindrical layer 1
02, and the third cylindrical layer 106
Is thermally fused onto the second cylindrical layer 104. When the foam tape constituting the second cylindrical layer 104 is thermally fused onto the first cylindrical layer 102, the first cylindrical layer 102 does not necessarily cover the entire width of the foam tape as long as the integrity of the heat insulating pipe cover 100 can be maintained. It is not necessary to heat-seal the upper part, for example, at least a part in the width direction (FIG.
(The range indicated by A in (a)) may be used. Third cylindrical layer 106
The same applies to the case where the foam tape constituting the above is thermally fused onto the second cylindrical layer 104.

The heat-insulating pipe cover 100 is manufactured by the manufacturing apparatus 6 used for manufacturing the heat-insulating pipe cover 50 of the second embodiment.
0 can be manufactured using the same device. In order to manufacture the heat insulating pipe cover 100 of the present embodiment, first, the first tape 114, the second tape 116, and the third tape 118 made of the same foamed plastic tape as the foamed tape of the first embodiment are used. As shown in FIG. 14, the first tape 114 is wound around the mandrel 62 while rotating the mandrel 62 at a constant rotational speed and moving it forward. When winding the first tape 114, the first tape 114 is spirally wound around the mandrel 62 so that there is no gap between the wound adjacent turns and no overlap. The tension applied to the first tape 114 when forming the first cylindrical layer 102 may be a tension that does not cause the tape to loosen.

The first cylindrical layer 1 with the mandrel 62 as the axis
02 while forming the first cylindrical layer 102 formed at the same time.
As shown in FIG. 14, the second tape 116 is wound around the outer surface of the. At this time, one side edge 110 formed by the second tape 116 is
The first tape 114 on which the first cylindrical layer 102 is formed is wound so as to be located at a position different from the side edge portion 108, and
While being wound, the inside of the second tape 116 is heated by the first heat-sealing heater 64, and the second tape 116 is heat-sealed on the first cylindrical layer 102. Heat-fused second tape 116
Forms the second cylindrical layer 104. The formation of the third cylindrical layer 106 is the same as that of the second cylindrical layer 104. The third tape 118 is wound around the outer surface of the second cylindrical layer 104 to form the third cylindrical layer 106. At this time, one side edge portion 112 formed by the third tape 118 is in contact with the second cylindrical layer 1.
04 is wound so as to be located at a position different from the side edge 110 of the second tape 116 on which the second tape 04 is formed.
The inside of the third tape 118 is heated by the second heat-sealing heater 66, and the third tape 118 is heat-sealed on the second cylindrical layer 104. The heat-sealed third tape 118 forms the third cylindrical layer 106. Further, similarly to the heat insulating pipe cover 20 of the first embodiment, after the formation of the third cylindrical layer 106, an aluminum tape may be attached in the longitudinal direction of the heat insulating pipe cover, that is, in the longitudinal direction.

After forming the heat-insulating pipe cover 100 on the mandrel 62 as described above, the heat-insulating pipe cover 100 is pulled out from the mandrel 62. Alternatively, the mandrel 62 may be withdrawn from the formed heat insulating pipe cover portion while forming the heat insulating pipe cover 100. Note that the tension at the time of winding the foam tape may be adjusted in advance so that the heat insulating pipe cover 100 can be easily pulled out.

The heat insulating pipe cover 100 of the eighth embodiment has the following advantages in addition to the advantages of the first embodiment. (1) Since the cylindrical layer and the cylindrical layer are heat-sealed to each other, the heat insulating pipe cover has good integrity, and also has resistance to mechanical external forces such as bending and pulling while maintaining flexibility. Is strong. (2) The cylindrical layer is formed in such a manner that the side edges of the foam tape are almost abutted with each other, and there is no overlapped portion. Therefore, there is no gap between the cylindrical layers and the inner and outer surfaces of the heat insulating pipe cover. It is formed as a smooth cylindrical surface. Therefore, the usability of the tubular body as a heat insulating material is good. (3) Example 1 in which the side edges of the foam tape are heat-sealed.
It is easier to manufacture than.

[0044]

According to the first aspect of the present invention, a heat-sealing defect is prevented by winding a tape made of a foam material in a spiral shape and joining adjacent one-side tape side edges to form a cylindrical layer. Not
A long and insulated pipe cover with great flexibility is realized. INDUSTRIAL APPLICABILITY The heat-insulating pipe cover according to the present invention can be continuously and easily manufactured with various thicknesses using a simple manufacturing apparatus, and there is no waste of molding material. Therefore, a large variety of heat-insulating pipe covers can be economically produced in a small lot in a much more efficient manner than before.
Further, according to the second invention, the outer tape layer formed by spirally winding the foam tape and joining the adjacent tape side edges to each other, and spirally winding the foam tape are formed. By forming the heat-insulating pipe cover as a laminated cylindrical layer with at least one inner cylindrical layer, it is possible to realize a thick heat-insulating pipe cover with further improved heat insulating properties. Further, according to the third aspect, the first tubular layer formed by spirally winding the foam material tape, and the foamed tape joined to the first tubular layer while being spirally wound on the first tubular layer. By forming the heat-insulating pipe cover as a laminated cylindrical body with the second cylindrical layer made of a material tape, it is possible to realize a heat-insulating pipe cover in which the cylindrical layers are firmly joined to each other with good integration and easy to manufacture. . The heat-insulating pipe cover according to the present invention is suitable not only for heat insulation but also as a cushioning material, a floating material, and a decorative material.

[Brief description of the drawings]

FIG. 1A is a partial cross-sectional side view of a thick heat-insulating pipe cover according to a first embodiment, and FIG. 1B is a line I- in FIG. 1A.
It is a cross-sectional view in I.

FIG. 2 is a schematic perspective view illustrating a configuration of a heat insulating pipe cover manufacturing apparatus according to the first embodiment.

FIG. 3A is a partial cross-sectional side view of the thick heat-insulating pipe cover of the first embodiment, and FIG. 3B is a line II- of FIG. 3A.
It is a cross-sectional view in II.

FIG. 4 is a schematic perspective view showing an apparatus for manufacturing a heat-insulating pipe cover according to a second embodiment.

FIG. 5 is a perspective view of a heat insulating pipe cover according to a third embodiment.

FIG. 6A is a side sectional view of a heat insulating pipe cover of Example 4, and FIG. 6B is a perspective view of a tape.

FIG. 7 is a side sectional view of a heat insulating pipe cover according to a fifth embodiment.

FIG. 8 is a perspective view of a heat insulating pipe cover according to a sixth embodiment.

FIG. 9 is a perspective view of a heat insulating pipe cover according to a seventh embodiment.

FIG. 10 is a sectional view of an example of the heat insulating pipe cover according to the present invention.

FIG. 11 is a sectional view of an example of the heat insulating pipe cover according to the present invention.

FIG. 12 is a perspective view of a conventional heat insulating pipe cover.

FIG. 13 (a) is a partial cross-sectional side view of a thick-walled heat-insulating pipe cover of Example 8, and FIG. 13 (b) is FIG. 13 (a).
FIG. 3 is a cross-sectional view taken along line III-III of FIG.

FIG. 14 is a schematic perspective view showing a configuration of a heat insulating pipe cover manufacturing apparatus according to an eighth embodiment.

DESCRIPTION OF SYMBOLS 10 Cylindrical pipe 20 Heat-insulating pipe cover of Example 1 22 First cylindrical layer 24 Second cylindrical layer 26 Third cylindrical layer 27 Exterior 28 Joint 30 Manufacturing device 32 Mandrel 34 First heat fusion heater 36 2 Heat fusing heater 38 First tape 40 Second tape 42 Third tape 44 Aluminum tape 45 One turn being formed 46 One turn 48 Butting part 50 Heat insulating pipe cover of the second embodiment 52 First cylindrical layer 54 Second cylinder Layer 56 Third cylindrical layer 58 Fourth cylindrical layer 60 Manufacturing device 62 Mandrel 64 First heat fusion heater 66 Second heat fusion heater 68 Second tape 69 Joint 70 Third tape 72, 74 Air layer 75, 76 Thermal insulation Pipe cover 78, 81 Cylindrical layer 80, 82, 84, 88 Insulated pipe cover 90 Second cylindrical layer 92 First tape 94 Second tape 100 insulating pipe cover of Example 8 102 first cylindrical layer 104 second cylindrical layer 106 first tape 116 side edge portion 114 of the third cylindrical layer 108, 110, 112 foam tape second tape 118 third tape

Continued on the front page (72) Inventor Kensuke Mizobuchi 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Setsuo Tanaka 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A foam tape is spirally wound such that one side of the wound tape and one side of the adjacent tape are abutted against each other or the side edges are overlapped with each other. A heat insulating pipe cover comprising a cylindrical body formed by joining butted or superposed side edges to each other. 2. The heat insulating pipe cover according to claim 1, wherein a tape made of a material different from the foam material is wound around or vertically attached to the outside of the cylindrical body. 3. A foam tape is spirally wound so that one side of the wound tape and one side of a tape adjacent thereto are abutted against each other, or the side edges are overlapped with each other. And a laminated tubular body comprising an outer tubular layer formed by joining butted or superposed side edges to each other, and at least one inner tubular layer formed by spirally winding a foam tape. And insulated pipe cover. 4. A mode in which the side edges of one winding of a wound tape and one winding of an adjacent tape are separated from each other, a mode in which the side edges are abutted with each other, and a side edge is overlapped with each other. In any of the above aspects, the first tubular layer formed by spirally winding the foam material tape, and the side edges of one turn of the wound tape and one turn of the tape adjacent thereto are mutually connected. In any of the separated mode, the mode in which the side edges are abutted with each other, and the mode in which the side edges are superimposed, the first tape is formed by spirally winding the foam tape over the first tubular layer. A heat-insulating pipe cover comprising a laminated tubular body with a second tubular layer joined onto the tubular layer. 5. The heat-insulating pipe cover according to claim 3, wherein a tape made of a material different from the foam material is wound around or vertically attached to the outside of the laminated tubular body. 6. The method according to claim 3, wherein at least one cylindrical layer of the laminated cylindrical body is formed of a tape made of a material different from a foamed material. Insulated pipe cover.