JPH091710A - Heat insulation pipe cover, coating method using cover thereof and heat insulation pipe coating structure - Google Patents

Abstract

PURPOSE: To make it possible to perform working readily under the state, wherein working gloves are used, by extruding the outer skin of laminated sheets from one end part of a foaming sheet, forming an overlapped part, providing a laminated structure through a mold release sheet so that bonding can be performed with an adhesive material layer applied on the outer skin, and coating a part of the adhesive material layer with a protecting layer. CONSTITUTION: In a heat insulation pipe cover, a mold release sheet 4 is provided at the outer skin part of one end of a thermoplastic resin foaming sheet 7 laminated on the thermoplastic-resin foaming sheet 7 through the outer skins 1 and 2 of a synthetic resin sheet and an overlapped part 2. Furthermore, a part of an adhesive material layer is coated with a protecting sheet 6. Bonding and engagement of the foaming sheet are performed to a surface 8 of the other end part of the thermoplastic resin foaming over the cut part provided in the longitudinal direction of the adiabatic pipe cover by the adhesive material layer 3 applied on the overlapped part 2. The cut part is filled. At the same time, the adiabatic cover is fixed to a pipe P. At this time, the mold release sheet 4 can be readily grabbed at the part of the protecting layer 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a thermoplastic resin foam sheet having excellent thermal stability at the cut portion and excellent workability, particularly a heat insulating pipe cover made of a polyolefin foam sheet, and the same. The present invention relates to a coating method and a heat insulating pipe coating structure.

[0002]

2. Description of the Related Art In recent years, water supply / drainage hygiene equipment and air conditioning / refrigeration equipment have been widely used due to the demand for comfort in the living environment.

It is quite common to cover the piping of these facilities with a heat insulating material in order to keep the piping warm and cold. As such a heat insulating material, an inorganic compound such as rock wool, glass wool and calcium silicate has been conventionally used, and in recent years, instead of this, porous foam made of synthetic resin such as polyethylene, polystyrene and hard urethane is used as a heat insulating pipe cover. Often.

In order to facilitate the covering work on the pipe, the heat-insulating pipe cover for covering the pipe portion has a tubular body having a slit in the longitudinal direction, that is, a porous foam sheet wound in a tubular shape. After covering the pipe with, the work of closing this cut was taken for the original purpose of keeping warm and cold. As a method of closing such a break, a method of winding an adhesive tape on the pipe from above the porous foam,
There is a method in which the entire overlap portion having the pressure-sensitive adhesive layer is adhered along the cut provided in the longitudinal direction.

[0005]

However, in the case of the method of closing the cut in the longitudinal direction by such adhesive tape or the entire surface of the overlapping portion, there are the following problems. That is, there is a drawback that the adhesive tape portion and the overlap portion after closing the cut are directly subjected to radiant heat and severely deteriorated by heat, and the adhesive tape portion is discolored and easily cut. There is a drawback that the release sheet of the adhesive tape cannot be easily peeled off when the heat insulating pipe cover is attached to the pipe. In particular, when the work gloves were worn, the release sheet attached to the overlap portion was extremely difficult to remove, and workability was greatly impaired.

According to the present invention, when the heat-insulating pipe cover is attached to the pipe as described above, the work can be easily performed by the synergistic effect of the protective layer and the release sheet even when working gloves are used, and a break after the construction is made. An object of the present invention is to provide a heat insulating pipe cover having a structure in which thermal deterioration of a portion is remarkably improved, a coating method using the same, and a heat insulating pipe coating structure.

[0007]

The present invention employs the following means in order to solve the above problems.

That is, the heat insulating pipe cover of the present invention is
A sheet of a rectangular thermoplastic resin foam sheet on which an outer skin made of a synthetic resin sheet is laminated, the outer skin of the laminated sheet being one end of the foam sheet, and the end of the foam sheet. Is provided so as to project from the portion to form an overlap portion, and the overlap portion has a structure in which it is laminated via a release sheet so that it can be adhered by an adhesive layer applied to the outer skin, and A part of the pressure-sensitive adhesive layer is covered with a protective layer.

Further, in the method for coating a heat insulating pipe cover of the present invention, after covering the periphery of the pipe with such a heat insulating pipe cover, the overlapping portion is cut across the cuts formed at both ends of the foam sheet. The heat-insulating pipe of the present invention is characterized in that after overlapping and peeling off the release sheet, both ends of the foam sheet are adhered and engaged with each other by the pressure-sensitive adhesive layer of the overlap portion. The covering structure is
The pipe surface is covered with a thermoplastic resin foam sheet having an outer skin whose outermost layer is a synthetic resin sheet,
And, the cut formed at both ends of the foam sheet,
It is characterized in that it is covered and integrated with a pressure-sensitive adhesive layer at an overlap portion constituted by a pressure-sensitive adhesive layer at the outer edge portion and a protective layer.

[0010]

According to the present invention, the above-mentioned problems concerning the pressure-sensitive adhesive tape for a heat insulating pipe cover made of a conventional porous foam have been earnestly studied. As a result, a surface material is provided on the surface of the porous foam and the surface material is applied. As it is instead of the conventional adhesive tape, and at that time, the adhesive tape portion corresponding to the cut portion is covered and protected with another surface material, and at the same time, the protective layer and the release sheet are By synergistically utilizing the above, and paying attention to three points of adding a device for improving workability, a structure capable of achieving these at the same time was clarified.

FIG. 1 shows the heat insulating pipe cover of the present invention.
This will be described below.

FIG. 1 is a perspective view showing a heat insulating pipe cover of the present invention showing a state in which a pipe P is covered with a tubular body of a thermoplastic resin foam sheet 7 immediately before adhesive integration.
After peeling off the release sheet 4 by pulling the peeling grip portion 5 of FIG. 1, the outer skin end portion (overlap portion) 2 made of a synthetic resin sheet (film) is superposed on the engagement position 8 of the other end portion of the outer skin. The heat insulating pipe cover of the present invention is formed by bonding and adhering together. In addition, in this figure, the outer skins 1 and 2 have an adhesive (adhesive layer: not shown) on the entire inner side, and the cuts of the thermoplastic resin foam sheet 7 at the outer skin end portion 2 It is preferable that the portion that comes into contact with is partially covered with the protective layer 6.

FIG. 2 is a sectional view showing another example of the heat insulating pipe cover of the present invention. As is apparent from this figure, the outer skins 1 and 2 provided on the surface of the thermoplastic resin foam sheet 7 have a pressure-sensitive adhesive layer 3 on the entire inner side, and by the pressure-sensitive adhesive layer 3, the outer skin 1 2 and the foam sheet are bonded and integrated. The heat-insulating pipe cover of this figure is wrapped around the pipe P as shown in the figure, and then peeled off by the grip portion 5 of the release sheet 4 to be integrally bonded,
The heat insulating pipe cover of the present invention is formed. In these figures, the structure of the outer skin 1 may be extruded, laminated and fused and integrated, and the release sheet 4 may be laminated only on the outer skin end 2 with the adhesive 3.

FIG. 3 is a sectional view showing an example of a laminated body produced when the heat insulating pipe cover of the present invention is simply manufactured. In this example, one end of the foam sheet 7 is a laminated body in which outer skins 1 and 2 are laminated on a thermoplastic resin foam sheet 7 having a rectangular shape, usually a rectangular shape, with an adhesive (adhesive) 3 interposed therebetween. 1 shows a laminated structure in which a release sheet 4 is interposed in the outer skin portion 2 (overlap portion) of the portion. In this figure, a protective sheet 6 is provided, and the release sheet 4 is overlapped and laminated on the protective sheet 6. The protective sheet 6 in this figure is preferably provided so that the end portion of the foam sheet falls within the width of the sheet 6, but not only it is easily peeled off, but also the thermal stability of the outer coat and the adhesive is improved. Good from above.

Here, a method for adhering and engaging the outer edge portion, that is, the overlapping portion 2, will be described. That is,
As shown in FIGS. 1 and 2, a portion obtained by extending one end of the outer skin 1 laminated on the surface of the foam sheet 7 from the end of the foam sheet 7 from the viewpoint of weather resistance and aesthetic appearance, and this portion is included. The outer skin end portion constitutes the overlap portion 2.
When the adhesive layer 3 applied to this portion 2 crosses a cut provided in the longitudinal direction of the heat-insulating pipe cover and adheres and engages with the other end surface 8 of the foam sheet to close the cut. At the same time, the heat insulating pipe cover is fixed to the pipe P, but the present invention is characterized in that the protective layer 6 is provided on a part (almost intermediate part) of the pressure-sensitive adhesive layer. The protective layer 6 synergizes with the release sheet 4 and exhibits the characteristic of being extremely easy to grip during construction. That is, the release sheet 4
Is laminated so as to cover the protective layer 6 as well, so that the release sheet 4 can be easily grasped by the protective layer 6 and easily peeled off.

In FIGS. 1 to 3, the thermoplastic resin foam sheet 7 is made of polystyrene, polyurethane, or polyolefin resin foam. Among the thermoplastic resin foams, polyolefin resin foam is used. The body is preferred. For example, polyethylene, polypropylene, ethylene propylene copolymer, ethylene vinyl acetate copolymer alone, or a resin composition obtained by mixing these, a foaming agent is mixed, melt-extruded into a sheet,
A foam obtained by heat-foaming the sheet, in particular,
A foam having a closed cell structure is preferably used. The expansion ratio of the thermoplastic resin foam is preferably 5 to 100 times, more preferably 10 to 40 times.

The foam is preferably a foam having a crosslinked structure by electron beam crosslinking by electron beam irradiation or chemical crosslinking using a peroxide or a silane compound, but it is a foam having no crosslinked structure. It doesn't matter if there is.

The foam is a single piece of the foam (one piece).
However, it is also possible to use, for example, a plurality of foams having an appropriate thickness, which are laminated by various means such as adhesion or fusion. When properties such as heat resistance are required, a foam made of a synthetic resin having excellent heat resistance may be laminated on the inner layer of the foam of the present invention depending on the required properties. .

As the surface material (outer skin) constituting the outermost layer of the thermoplastic resin foam of the present invention, that is, as the synthetic resin sheet, a thermoplastic resin film or a thermoplastic resin fiber sheet can be used. Among them, those made of polyolefin resin are preferable. As such a polyolefin resin, a film or fiber sheet made of polyvinyl chloride, polyethylene, polypropylene, ethylene-propylene copolymer alone or a mixture thereof is preferably used. In order to integrate the outer cover with the thermoplastic resin foam, a usual pressure-sensitive adhesive (including an adhesive) can be applied or can be directly laminated on the foam sheet by extrusion lamination or the like. The thickness of the outer skin is not particularly limited, but is preferably 30 to 3
00 μm, more preferably 50 to 200 μm.

The pressure-sensitive adhesive used for the outer skin and its end portion of the present invention is usually used as a pressure-sensitive adhesive or an adhesive, for example, natural rubber, synthetic rubber, acrylic, urethane, vinyl acetate, etc. Can be used. The width and thickness of the pressure-sensitive adhesive layer are not particularly limited.
The thickness is preferably 10 to 300 μm, more preferably 50 to 200 μm. The width of the pressure-sensitive adhesive layer in the circumferential direction of the overlapping portion depends on the diameter of the heat insulating pipe, and is not limited to any particular value, but is preferably 10 to 100 mm, A work piece having a thickness in the range of 20 to 60 mm may be preferable for easy construction.

The protective layer for protecting the outer skin and the pressure-sensitive adhesive layer is a paper, which is usually used as a protective layer or a reinforcing layer,
Alternatively, it may be either a polyolefin resin such as polyethylene, polypropylene or polyvinyl chloride, or a film or fiber sheet made of polyester or other thermoplastic resin. Further, the width may be such that the cut portion can be covered, and preferably 5 to 50 m.
m, more preferably 10 to 30 mm, and the thickness is
It is not particularly limited as long as it functions effectively against heat deterioration, but is preferably 20 to 800 μm, more preferably 30 to 500.
μm.

The release sheet can be made of the same material as that of the protective layer, and its surface is treated with silicon or emboss for the purpose of making it easier to peel off. It may be one. The width and thickness are not particularly limited, but it is sufficient if the protective layer has at least an overlapping width, but it is preferable that the overlapping portions have a width of at least 5 mm, and if there is a width of more than 5 mm, work gloves should be worn. It can be easily peeled off with it fitted. Practical, and specifically preferably 5
~ 50 mm, more preferably 10-30 mm,
The thickness is preferably 20 to 200 μm, more preferably 30 to 150 μm.

Next, an example of the method of manufacturing the heat insulating pipe cover of the present invention will be described, but the method is not limited to this.

A thermoplastic resin mixed with a foaming agent, particularly a polyolefin resin, is melt-extruded to form a sheet, and an average absorbed dose of 2 to 50 Mrad. The electron beam is irradiated at the strength of to crosslink. 20 sheets irradiated with electron beam
It is continuously supplied to a hot-air heating furnace maintained at 0 to 400 ° C or a chemical bath using silicone or a mixture of sodium nitrite and potassium nitrate, etc. to decompose the foaming agent and foam the sheet by a gasification reaction, Obtain a foam sheet. After slitting the obtained foam sheet 7 into a predetermined width, the outer cover 1 made of a synthetic resin, particularly a polyolefin resin, which is the outermost layer after forming the pipe cover, and the adhesive layer 3 at the end 2 of the outer cover, the adhesive A protective layer 6 for protecting the surface of the agent layer and a release sheet 4 are laminated in the order shown in FIG.

The lamination of the outer skins 1 and 2 and the foam sheet is
A usual laminating method such as a method using an adhesive or a method using extrusion lamination may be used, but an adhesive is applied to the entire outer surface of a polyolefin resin film, for example, and a thermoplastic resin foam sheet is formed thereon as described above. A protective layer on the surface of the pressure-sensitive adhesive layer and a release sheet may be laminated in the same manner.

The outer laminated flat plate foam sheet thus obtained is processed into a tubular shape and formed into a heat insulating pipe cover. The method of molding is not particularly limited, but the tip is cut off,
Guide the laminated flat foam sheet into the conical guide used as the sheet outlet, and heat both ends of the rounded foam at the guide outlet to 100 to 500 ° C to form a tubular shape. It is possible to adopt a method of doing so.

As another method, after the flat foam sheet is guided into the above-mentioned conical guide, both ends of the rounded foam sheet are heated and fused to form a tubular shape. After obtaining the pipe cover, a method is used in which an outer cover made of a synthetic resin sheet is laminated on the pipe cover, and then an adhesive layer at the end of the outer cover, a protective layer on the surface of the adhesive layer, and a release sheet are laminated. May be.

By using the pipe cover of the present invention, it is possible to perform the coating operation very simply and quickly. That is, after using the heat-insulating pipe cover to cover the periphery of the pipe, the overlapping portions are overlapped with each other across the cut formed at both ends of the foam sheet. Then, the release sheet may be peeled off, and both ends of the foam sheet may be abutted with each other by the pressure-sensitive adhesive layer of the overlapping portion to be adhered and engaged. At this time, in order to facilitate the work of peeling off the release sheet, the release sheet is made longer or wider than the outer cover and a grip portion is provided,
It is preferable that the part covered with the release sheet is long or wide, for example, has a width that is easy to hold, such as about 5 to 10 cm.
Further, in such coating, by taking care so that the cut portion is covered by the protective layer, it is possible to improve the drawback that heat directly escapes through the cut, and further, the adhesive and the aging of the outer skin due to the heat. Can be prevented.

By this coating method, the pipe surface is
The outermost layer is covered with a thermoplastic resin foam sheet having an outer cover made of a synthetic resin sheet, and the cuts formed at both ends of the foam sheet have a pressure-sensitive adhesive layer and a protective layer at the end of the outer cover. It is possible to form a heat-insulating pipe-covered structure in which the pressure-sensitive adhesive layer in the overlap portion constituted by is integrally coated. In this structure, when the cut is covered with the protective layer, the above-mentioned effects can be achieved, which is preferable.

[0030]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. Example 1 100 parts by weight of polyethylene was mixed with 15 parts by weight of azodicarbonamide as a foaming agent and melt-extruded to obtain an unfoamed sheet. Average absorbed dose of 6.3 Mra on the sheet
d. After irradiating with electron beam to crosslink, the foaming agent is decomposed in an oven at 300 ° C to foam the sheet, and the thickness is 10m.
m and a foaming ratio (volume / weight) of 40 times were obtained. The foam was slit into a width of 424 mm.

On the other hand, the outer skin has a thickness of 100 μm and a width of 46.
1mm acrylic adhesive on 4mm polyvinyl chloride sheet
The coating was performed so that the coating thickness was 00 μm. Foam with slit of 424 mm and acrylic adhesive applied 4
A 64 mm wide polyvinyl chloride sheet is laminated, and a release sheet made of siliconized polypropylene with a thickness of 150 μm and a width of 60 mm is applied to the 40 mm wide polyvinyl chloride sheet wider than the foam with an acrylic adhesive. The polyvinyl chloride sheet was laminated at a position where the end of the release sheet protruded 5 mm from the end of the outer cover.

Furthermore, when the release sheets are laminated, the thickness of the release sheet is 5
A protective layer made of a polyvinyl chloride sheet having a width of 0 μm and a width of 15 mm was laminated in the order of FIG. 3 so that the overlapping width with the release sheet was 10 mm to obtain a flat foam sheet in which the layers were laminated.

This foam sheet has an outlet inner diameter of 135 m.
m, cut off the tip and guide it into a conical guide that serves as a sheet outlet, and heat a circularly rounded foam sheet to 200 ° C. to fuse it to obtain a tubular pipe cover with an inner diameter of 115 mm. It was

The pipe cover thus obtained has a release sheet made of polypropylene treated with silicon, which is separated by a protective layer made of polyvinyl chloride and is not in contact with the acrylic pressure-sensitive adhesive layer. It was easy to remove even with gloves on.

Further, when the pipe cover of this embodiment was attached to a pipe having a surface temperature of 80 ° C., no change was observed even after 3 months passed, but at the same time, the pipe cover without the release sheet ( In the case of Comparative Example), the surface of the cut portion of the cover turned yellow and was thermally deteriorated.

[0036]

As described above, according to the present invention, when the pipe facility is covered with the heat insulating pipe cover for keeping warm and cold, the work is done by using the pipe cover which is constructed by carefully combining the various elements. The release sheet can be easily peeled off even in the state, and workability during construction work can be greatly improved.

As described above, the present invention can bring about an extremely substantial industrial effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state immediately before the pipe is covered with the heat-insulating pipe cover of the present invention, and the release sheet is just peeled off to be bonded and integrated.

FIG. 2 is a cross-sectional view showing another example of the heat insulating pipe cover of the present invention.

FIG. 3 is a cross-sectional view of a flat sheet of the heat insulating pipe cover of the present invention.

[Explanation of symbols]

 1: Outer skin 2: End of outer skin (overlap portion) 3: Adhesive layer 4: Release sheet 5: Grip portion or overlapping portion of release sheet 6: Protective layer 7: Thermoplastic resin foam 8: Overlap portion Engagement position P: Piping

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Claims (13)

[Claims] 1. A sheet in which a synthetic resin sheet is laminated on the surface of a rectangular thermoplastic resin foam sheet, the outer layer of the laminated sheet being one end of the foam sheet, A structure in which the foam sheet is provided so as to project from an end portion thereof to form an overlap portion, and the overlap portion is laminated via a release sheet so that the overlap portion can be adhered by an adhesive layer applied to the outer cover. And a part of the pressure-sensitive adhesive layer is covered with a protective layer. 2. The heat insulating pipe cover according to claim 1, wherein the foam sheet end portion is present within the width of the protective layer. 3. The heat insulating pipe cover according to claim 1, wherein the protective layer and the release sheet are made of at least one material selected from paper, woven / knitted fabric, non-woven fabric and thermoplastic resin film. 4. The heat insulating pipe cover according to claim 1, wherein the release sheet overlaps the protective layer by at least 5 mm. 5. The heat insulating pipe cover according to claim 1, wherein the release sheet has a grip portion required for release. 6. The heat insulating pipe cover according to claim 1, wherein the synthetic resin sheet is at least one selected from a thermoplastic resin film and a thermoplastic resin fiber sheet. 7. The synthetic resin sheet is polyvinyl chloride,
The heat-insulating pipe cover according to claim 1, which is a film or a fiber sheet made of polyethylene, polypropylene, an ethylene-propylene copolymer alone or a mixture thereof. 8. The heat insulating pipe cover according to claim 1, wherein the thermoplastic resin foam sheet is a polyolefin resin. 9. The insulating pipe cover according to claim 1 is used to cover the periphery of the pipe, and then the overlapping portions are overlapped with each other across a cut formed at both ends of the foam sheet, and the release is performed. A method for coating a heat-insulating pipe cover, characterized in that after the sheet is peeled off, both ends of the foam sheet are adhered and engaged with each other with a pressure-sensitive adhesive layer of the overlapping portion. 10. In the heat insulating pipe cover sheet,
The method for coating a heat insulating pipe cover according to claim 9, wherein the cut portion is coated with the protective layer. 11. The method for coating a heat insulating pipe cover according to claim 9, wherein the thermoplastic foam sheet is a polyolefin resin. 12. The method for coating a heat-insulating pipe cover according to claim 9, wherein the synthetic resin sheet is a film or fiber sheet made of polyvinyl chloride, polyethylene, polypropylene, ethylene-propylene copolymer alone or a mixture thereof. . 13. A pipe surface is covered with a thermoplastic resin foam sheet having an outer skin whose outermost layer is a synthetic resin sheet, and cuts formed at both ends of the foam sheet have the outer skin. A heat-insulating pipe-covered structure, characterized in that the heat-insulating pipe-covered structure is integrated with a pressure-sensitive adhesive layer in an overlapping portion composed of a pressure-sensitive adhesive layer at an end portion and a protective layer.