JP4151938B2 - Insulating material for bent pipe and method for manufacturing the insulating material for bent pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bent pipe heat insulating material and a method for manufacturing a bent pipe heat insulating material, for example, a bent pipe heat insulating material for insulating a bent water pipe and a hot water pipe from outside air and a method for manufacturing the bent pipe heat insulating material.
[0002]
[Prior art]
Conventionally, a pipe heat insulating material 60 as shown in FIG. 7 has been used in order to insulate from the outside air by attaching it to the outside of a water pipe or a hot water pipe.
Such a pipe heat insulating material 60 is made of a heat insulating material such as polyethylene foam, for example, and has a tubular heat insulating main body 62 having a space 61 through which a water pipe or the like passes in the center, and an outer peripheral surface of the heat insulating main body 62. For example, a covering material 63 such as polyethylene is coated.
The heat insulating body 62 is provided with a slit 64 along the axial direction thereof, and a fin portion 65 projects in the pipe radial direction in the vicinity of the slit 64 and along the slit 64. Is provided. An adhesive 66 is provided on one surface of the fin portion 65 (inner side surface when pasted), and a detachable separator 67 is attached so as to cover the adhesive 66.
[0003]
In order to attach the pipe heat insulating material 60 configured in this way to a water pipe or the like, the slit 64 is widened, the water pipe or the like is fitted into the space 61, the separator 67 of the fin portion 65 is peeled off, and the adhesive 66 is exposed (for example, The separator 67 is peeled off and exposed in the direction indicated by the arrow B in FIG. 7), and is fixed to the covering material 63 so that the fin portion 65 straddles the slit 64.
By sticking the fin portion 65 in this way, it is possible to prevent the slit 64 of the heat insulating material body 62 from opening and prevent it from falling off from the water pipe or the like, and to maintain the heat retaining performance. In addition, it can improve the appearance.
[0004]
[Problems to be solved by the invention]
By the way, the pipe heat insulating material 60 described above is made straight so that no extra external force or the like is applied and no distortion remains in the inside. For this reason, it is easy to install when installing on straight parts such as water pipes, but when installing on a curved part, it must be installed while bending the pipe insulation 60, not only the workability is bad, When attached to a bent water pipe or the like, the pipe heat insulating material 60 is bent, and a large space is formed before and after the bent part. This space part is cut off from the outside by vinyl tape or the like and directly into the atmosphere. Although there is no contact, there is a problem that condensation or water droplets are easily formed in the internal space and mold is generated.
In addition, if the fin portion 65 is curved inwardly, the inner surface of the fin portion 65 and the heat insulating material body 62 is wrinkled, and the adhesive surface with the covering material 63 is easily peeled off, creating a gap, There is a problem that it looks bad.
[0005]
The present invention has been made in view of the above-mentioned problems, and its purpose is to improve the workability when attaching to a curved water pipe or the like, and to ensure the heat retaining performance by making it difficult to peel off and to have a good appearance. It is providing the manufacturing method of the heat insulating material for curved pipes, and the heat insulating material for curved pipes.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention, as described in claim 1, covers a tubular heat insulating material body with a covering material and has a slit along the axial direction of the heat insulating material body, In the heat insulating material for a curved pipe having a fin portion that protrudes integrally with the coating resin in the radial direction of the heat insulating material body along the slit,
A contraction force applying means having a contraction force for bending the heat insulating material body in the longitudinal direction is provided in the fin portion so as to be detachable from the fin portion.
[0007]
Here, as the heat insulating material main body, for example, a polyethylene foam having high heat insulating properties can be used, and as the covering material, a sheet-like synthetic resin such as polyethylene can be used. Moreover, a fin part can be integrally provided with a coating | covering material by extrusion molding. Alternatively, a planar covering material can be wound around the outside of the heat insulating material body, and a fin portion can be provided as an extension thereof. Further, as the contraction force applying means, another elastic member having contraction force to be attached to the fin portion can be considered.
[0008]
In the heat insulating material for curved pipes configured as described above, a predetermined tension is applied during the production line, so that the linear shape is maintained. It is gradually bent by force. In addition, after cooling, the curved pipe heat insulating material is maintained in a curved state so as to be dented toward the fin portion by the contraction force applying means, and after being bent, the contraction force applying means is peeled off. However, it becomes the heat insulating material for curved pipes that maintain the bent state.
As a result, when attaching to a curved water pipe or the like, not only will the folds and gaps not easily adapt to the curved part, but also the fins will be difficult to peel off, ensuring heat retaining performance and a good-looking appearance. Will be able to get.
Therefore, in this heat insulating material for curved pipes, the problem that the workability is deteriorated when attaching to a curved portion as in the conventional case, and since the fin portion can be wrinkled, the covering material is easily peeled off and a gap is formed and mold occurs. Or the problem of deterioration in heat retention performance and poor appearance.
[0009]
Further, according to the present invention, as described in claim 2, in the heat insulating material for curved pipes described in claim 1, the contraction force imparting means covers the adhesive applied to the fin portion and is detachably attached. It is characterized by being a tape-shaped separator.
[0010]
Here, as an adhesive, there exists what is provided in a fin part by the method of transcription | transfer to a fin part using a double-sided tape, application | coating of an adhesive, etc. Moreover, it is also possible to use the same material as the coating material as the elastically deforming separator. This separator can be removed relatively easily because it is removed when the fin portion is bonded to the covering material with the adhesive after the heat insulating material for the bent pipe is attached to the water pipe or the like.
[0011]
In the heat insulating material for the bent pipe configured as described above, since the elastic separator is attached to the fin portion in a state where the elastic separator is pulled, when the force for pulling the separator and the heat insulating material body is removed, the separator becomes another portion. Rather than shrink in the longitudinal direction of the heat insulating material for the bent pipe. The fin portion is contracted by the contraction force, and the contraction force contracts the fin portion side of the main body of the heat insulating material. Therefore, it is possible to create a state in which the heat insulating material for the curved pipe is curved with the fin portion side inside. Even after the curved pipe heat insulating material is cooled, the curved body is maintained for a long time, so that the heat insulating material body also has a bent shape and functions as a curved pipe heat insulating material.
[0012]
Moreover, this invention has a slit which coat | covers a pipe-shaped heat insulating material main body with a coating | covering material, and follows the axial direction of this heat insulating material main body as described in Claim 3, Along the said slit and heat insulating material. In a method for manufacturing a heat insulating material for a curved pipe having a fin portion protruding integrally with the coating resin in a substantially radial direction of a main body, an elastic separator is provided so as to cover the pressure-sensitive adhesive after the pressure-sensitive adhesive is provided on the fin portion. After the separator is pasted, the heat insulating material body is bent by the elastic contraction force of the separator so that the fin side is recessed along the axial direction of the heat insulating material body. It is characterized by letting.
[0013]
Here, a polyethylene foam having high heat insulating properties can be used as the heat insulating material body, and polyethylene can be used as the covering material, for example. Moreover, a fin part can be integrally provided with a coating | covering material by extrusion molding. Moreover, a fin part can also be provided as extension of a coating | covering material. Further, as the separator, a material different from the coating material can be used. Furthermore, the pressure-sensitive adhesive can be provided so as to be transferred using a double-sided tape or the like as well as the one to be applied.
[0014]
In the method of manufacturing a heat insulating material for a bent pipe constructed as described above, an elastic separator in a stretched and stretched state is attached to the adhesive applied to the fin portion, so that the manufacturing process is finished and left in a natural state. Since the tensile force required for the manufacturing process is removed, the elastic contraction force of the separator acts so that the fin part side of the heat insulating material body contracts via the fin part and the covering material. The fin side is curved inward. If this curved state is maintained for a long time after cooling, the heat insulation body will be bent and bent, so that when it is attached to a curved water pipe, etc. Since it is mounted on a pipe or the like, there is no wrinkle or bending, the workability is improved, and the sticking of the fin portion is hardly peeled off, so that a higher heat retaining performance can be secured and a good appearance can be obtained.
[0015]
Therefore, in this method of manufacturing a heat insulating material for curved pipes, since the workability deteriorates when attached to a curved portion as in the prior art, and there are wrinkles and gaps in the main body of the heat insulating material or wrinkles in the fin portion. The covering material is easily peeled off and a gap is formed, so that problems such as a decrease in heat retention performance and a poor appearance can be solved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below in detail with reference to the drawings.
As shown in FIG. 1, a curved pipe heat insulating material 10 according to an embodiment of the present invention has a tubular heat insulating material made of a heat insulating material such as polyethylene foam having a space 11 for passing a water pipe or the like in the center. The outer peripheral surface of the heat insulating material body 12 is covered with a covering material 13 such as polyethylene over the entire periphery.
[0017]
The heat insulator main body 12 is provided with a slit 14 reaching the space 11 along the axis. The above-described covering material 13 is provided with a fin portion 15 extending in the vicinity of the slit 14 along the slit 14 and in the pipe radial direction of the heat insulating material body 12. The fin portion 15 is provided with an adhesive 16, and a separator 17 that covers the adhesive 16 and leaves the adhesive 16 on the fin portion 15 side is attached.
[0018]
The separator 17 is made of an elastically deformable material, and is pasted by a manufacturing method described later so that a contracting force F is generated along the longitudinal direction of the separator 17 (longitudinal direction of the heat insulating material 10 for bent pipes). It functions as a contraction force applying means for contracting the heat insulating material 10 for bent pipes to one side along its longitudinal direction.
Therefore, the curved pipe heat insulating material 10 is maintained in a state in which the central axis C1 is curved with a predetermined curvature R. Thus, if the state bent by the contraction force F of the separator 17 is maintained for a long time (long term) including the time when the temperature of the fin portion 15 returns to the normal temperature, the bent tube heat insulating material 10 is bent. Even after peeling, the separator 17 is peeled off (for example, peeled off by an arrow B shown by an imaginary line in FIG. 1).
[0019]
The separator 17 is not particularly limited in its material, but is an elastic tape-like member such as polyethylene, for example, and is attached to the fin portion 15 as described later. It can be elastically deformed and contracts after the tensile force is released after being applied. By this contraction, the fin portion 15 is contracted in the longitudinal direction, and as a result, the heat insulating material body 12 is curved with the fin portion 15 side inward.
[0020]
An example of the curved state in the heat insulating material 10 for curved pipes of this embodiment is shown in FIG. 2A shows the curved state of the curved pipe heat insulating material 10, and FIG. 2B shows the curved pipe heat insulating material 10 viewed from the end face direction.
The heat insulating material 10 for bent pipes shown in FIG. 2 is manufactured by continuously sticking the separator 17 in a stretched state, and is sufficiently long after being cut in a straight state before being bent. This is the state after being left.
In addition, the separator 17 peeled off from the fin part 17 of the heat insulating material 10 for curved pipes shown to (a) of FIG. 2 was 1942 mm in length after peeling. This means that the length before the separator 17 corresponding to this length was 1942 mm or less with respect to the heat insulating material body of 2007 mm.
Immediately after the separator 17 is peeled off and the tensile force is released (as shown in the figure), the bent pipe heat insulating material 10 is insulated from the straight line D connecting both ends of the inner side of the heat insulating material body 12 at the center in the longitudinal direction. The main body 12 has a curved shape such that the distance H to the curved inner surface is 135 mm. At this time, the outer arc length L of the curved pipe heat insulating material 10 is 2007 mm.
In this case, the outer diameter D of the heat insulating material 10 for bent pipes is 42 mm, and the inner diameter d is 22 mm.
[0021]
Next, based on FIG. 3, the manufacturing method of the heat insulating material for curved pipes concerning this invention is demonstrated.
FIG. 3 shows a main part of the production line 18 for the bent pipe heat insulating material 10.
In the production line 18, a material supply stand 19 is provided on the upstream side (left side in FIG. 3), and a circular tubular heat insulating material body 12 having a space 11 in the center is wound around the material supply stand 19. The roll 20 is supported so as to be rotatable while maintaining a predetermined drawing resistance. Accordingly, the heat insulating material body 12 is drawn out and supplied from the material supply base 19 in the downstream direction (right direction in FIG. 3).
[0022]
A material blender 21 is provided on the downstream side of the material supply base 19. In this material compounding machine 21, using the material of the coating material 13 supplied from the hopper 22, the coating material 13 melted by the extruder 23 is continuously fed into a predetermined space of the extrusion die 24 as shown in FIG. To supply. Here, since the heat insulating material body 12 passes through this space at the conveyance speed, the heat insulating material body 12 is covered with the molten coating material 13 supplied thereto. Therefore, as shown in FIG. 5, the covering material 13 is continuously provided on the entire circumference of the outer peripheral surface of the heat insulating material body 12.
[0023]
A water tank 25 having a predetermined length is provided on the downstream side of the extruder 23. The water tank 25 is cooled while maintaining the shape of the coating material 13 that has been extruded by the extruder 23 and is still in a high temperature state. In addition, an annealing device 26 is provided on the downstream side of the water tank 25, and this annealing device 26 removes internal strain generated by covering the insulating material body at room temperature with the covering material 13 and the fin portion 15. An annealing process is performed for this purpose. In the post-process, the separator is stuck in a tensile state while the temperature of the insulating material including the covering material and the fin portion remains relatively high by heating at this time.
Note that a printing machine 27 is provided on the downstream side of the annealing device 26, and a predetermined appropriate description is printed on the covering material 13.
[0024]
The heat insulating body 12 covered with the covering material 13 has a double-sided tape affixed to one surface of the fin portion 15 (an inner surface when the fin portion 15 is affixed) by a double-sided tape applicator 28. Is peeled off, and the adhesive 16 is transferred and formed on the fin 15. Then, the separator 17 is continuously pasted to the fin portion 15 where the adhesive 16 is formed by the separator pasting machine 29.
That is, as shown in FIG. 4, for example, when a roll-shaped separator 17 held rotatably about the rotation axis C is attached to the fin portion 15, the separator 17 is attached with a predetermined tensile force. Paste in a stretched state.
[0025]
For example, as shown in FIG. 4, the tension of the separator 17 is adjusted between a pressing roller 17a for attaching the separator 17 to the fin portion 15 and pinch rollers 17b and 17b on the upstream side of the pressing roller 17a. , The rotational speeds of the pinch rollers 17b and 17b are controlled so that the separator 17 is extended.
[0026]
After the separator 17 is pasted, the cutting machine 30 provided on the downstream side of the separator pasting machine 29 cuts off the excess portion near the tip of the fin section 15 as shown in FIG. Slits 14 are continuously provided along the axial direction in the covering material 13 and the heat insulating material body 12 in the vicinity of the 15 base end portions.
[0027]
Since the heat insulating material body 12 and the covering material 13 are transported by the pulling machine 31 provided on the downstream side of the cutting machine 30, the heat insulating material body 12 is conveyed in a straight state. ing. If necessary, a take-up machine can be provided immediately after the material supply base 19.
On the downstream side of the cutting machine 30, when the tensile force is released, the tensile force of the separator 17 becomes obvious and starts to bend. In addition, the bent pipe heat insulating material 10 is cut into a predetermined length by the fixed size cutting machine 32, and the bent pipe heat insulating material 10 is manufactured.
Although the cut heat insulating material 10 for the bent pipe is still at a relatively high temperature, the fin portion 15 is particularly formed in a contracted state while being cooled to room temperature, and this state is maintained over a long period of time. As shown in FIG. 2 with a curved wrinkle, the product has a curved shape with the fin 15 side inside.
[0028]
According to the above-described method for manufacturing a heat insulating material for bent pipes and heat insulating materials for bent pipes, the heat insulating material for bent pipes 10 is applied by a simple technique of attaching the separator 17 to the adhesive 16 of the fin portion 15 by pulling it appropriately. Since a tensile force (shrinkage force) is applied to the fin portion 15, the curved heat insulating material for a bent pipe 10 can be easily manufactured.
[0029]
Moreover, since the curved heat insulating material 10 for curved pipes can be easily fitted in curved parts, such as a water pipe and a hot water pipe, workability is improved. In addition, the curved bent pipe heat insulating material 10 eliminates the problem of wrinkles and bending of the heat insulating material body 12 which is a drawback when a straight pipe heat insulating material is bent and attached, and the fin portion 15 can be wrinkled and the covering material 13 Can be prevented from being easily peeled off, so that the heat insulating material 10 for the bent pipe can be securely attached. Along with this, it is possible to solve the problem that the heat retention performance is deteriorated and the appearance is deteriorated.
[0030]
In addition, the manufacturing method of the heat insulating material for curved pipes and the heat insulating material for curved pipes of this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
For example, in each of the above-described embodiments, the adhesive 16 is transferred and formed using the double-sided tape of the fin 15, but a fluid or a viscous adhesive is applied to the fin 15 without using the double-sided tape. It may be a method.
It is also possible to attach an elastic double-sided tape, on which the separator 17 has been previously attached, to the fin portion 15 in a state of being integrally stretched by a tensile force.
In addition, since the curvature rate of the heat insulating material 10 for curved pipes changes depending on the contraction force of the separator 17, the feeding speed when the separator 17 is attached to the fin portion 15 by the separator attaching machine 29, and the elastic body main body by the take-up machine 31. By controlling the relationship with the speed at which 12 and the fin portion 15 are fed, the curvature of the separator 17 can be adjusted to adjust the curvature. By this tension adjustment, a product having a predetermined curvature can be freely obtained.
[0031]
【The invention's effect】
As described above, according to the heat insulating material for a bent pipe according to the present invention, as described in claim 1, the fin portion side of the heat insulating material body is contracted by the contraction force of the fin portion, and is curved toward the fin portion side. Therefore, the curved heat insulating material for curved pipes can be manufactured easily. This not only improves workability when attaching to curved water pipes, but also eliminates problems such as bending of pipe insulation, creating a large space before and after the bent part, and causing mold. Furthermore, by making it difficult to peel off, it is possible to ensure the heat retaining performance and obtain a good-looking appearance.
[0032]
Further, according to the heat insulating material for a bent pipe according to the present invention, as described in claim 2, since the elastic separator is attached to the fin portion in a pulled state, when the force for pulling the separator is removed, the separator Since the fin portion is contracted by the elastic contraction force and the contraction force contracts the fin portion side of the heat insulating material body, the heat insulating material for the bent pipe can be easily bent.
[0033]
Moreover, according to the method for manufacturing a heat insulating material for a bent pipe according to the present invention, as described in claim 3, an adhesive is provided on the fin portion, and an elastic tape-like separator is pulled so as to cover the adhesive. In the stretched state, it is attached so that it can be peeled off, and by releasing the tension after applying the separator, the insulator body is bent by the elastic contraction force of the separator with the fin side inward along the axial direction of the insulator body. Therefore, it is possible to provide a heat insulating material for a curved pipe that can improve the workability when attaching the heat insulating material to a curved water pipe, etc., and there is no bending or wrinkle, and the fin part can be made difficult to peel off, and more heat insulation performance is secured. It is possible to manufacture a heat insulating material for a bent pipe that can obtain a good appearance.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a heat insulating material for a bent pipe according to the present invention.
FIG. 2 is an explanatory view showing a curved state of a heat insulating material for a bent pipe.
FIG. 3 is an overall view showing a production line for a bent pipe heat insulating material by the method for manufacturing a bent pipe heat insulating material according to the present invention.
4 is a schematic view for explaining a process of attaching a separator in the production line shown in FIG. 3; FIG.
FIG. 5 is a cross-sectional view taken along line IV-IV in FIG. 3, showing a forming die when a covering material and a fin portion are integrally formed on the outside of a heat insulating material body by an extruder.
FIG. 6 is a cross-sectional view showing the cutting of a fin portion integrally formed with a covering material and the formation of a slit.
FIG. 7 is a perspective view showing a conventional heat insulating material for pipes.
[Explanation of symbols]
10 Insulation for curved pipes
12 Insulation body
13 Coating material
14 Slit
15 Fins
16 Adhesive (adhesive means)
17 Separator (Means for applying shrinkage force)

Claims (3)

The tubular heat insulating material body is covered with a covering material and has a slit along the axial direction of the heat insulating material body, and protrudes integrally with the coating resin along the slit and in a substantially radial direction of the heat insulating material body. In a heat insulating material for curved pipes having a fin,
A heat insulating material for a curved pipe, characterized in that a contraction force applying means having a contraction force for bending the heat insulating material body in its longitudinal direction is provided in the fin portion so as to be detachable from the fin portion. The said contraction force provision means is a tape-shaped separator which covered the adhesive apply | coated to the said fin part, and was stuck so that peeling was possible, The heat insulating material for curved pipes described in Claim 1 characterized by the above-mentioned. The tube-shaped heat insulating material body is covered with a covering material and has a slit along the axial direction of the heat insulating material body, and protrudes integrally with the coating resin along the slit and in a substantially radial direction of the heat insulating material body. In the method for manufacturing a heat insulating material for a curved pipe having a fin portion,
After the adhesive is provided on the fin portion, the elastic separator is pulled and stretched so as to cover the adhesive, and is peelably pasted. After the separator is pasted, the heat insulation is performed by the elastic contraction force of the separator. A method of manufacturing a heat insulating material for a bent pipe, wherein the material main body is curved so that the fin portion side is recessed along the axial direction of the heat insulating material main body.

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