JPH0319676Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to a dew-proof cover for piping such as hot and cold piping. [Prior Art] Conventionally, various types of hot and cold piping have been equipped with heat insulating covers made of foam material to improve their heat insulation properties. However, it was found that the insulation cover alone was not able to completely prevent condensation.
Therefore, the inventors considered providing a layer made of a water absorbing agent on the outer peripheral surface of the heat insulating cover. The water absorbing agent absorbs and retains moisture on the surface, thereby preventing the occurrence of dew condensation, and releases the moisture once absorbed at an appropriate time. [Problem to be solved by the invention] However, even when attempting to adhere the water absorbing agent to the heat insulating cover, it was found that the adhesion was not sufficiently performed. Furthermore, even if a water-absorbing layer is created by applying a mixture of paint or adhesive and a water-absorbing agent to the heat-insulating cover, it takes time to install. This invention was made in view of the above circumstances, and the purpose is to provide a dew-proof cover for piping that has a high dew-proof effect and is also easy to install. [Means for solving the problem] In order to achieve the above objectives, the inventors conducted repeated research. As a result, we discovered that it is sufficient to use a condensation-proof cover for piping that has a water-absorbing layer on one side of a band-shaped fibrous support layer.
I completed this idea. Therefore, this invention includes a band-shaped fibrous support layer that is placed on the surface side of a heat insulating foam layer that covers the outer peripheral surface of the pipe, and a layer that is separate from the fibrous support layer on the surface of this fibrous support layer. The gist of the product is a tape-shaped condensation-proof cover for piping, on which a water-absorbing layer is formed. [Function] When the water absorption layer is formed on the surface of the fibrous support layer, a part of the material constituting the water absorption layer enters the fine voids between the fibers of the fibrous support layer, so that the water absorption layer is firmly held and fixed. Become something. By wrapping a condensation-proof cover made of a fibrous support layer with a water-absorbing layer on its surface around the target piping, the fibrous support layer deforms flexibly and can easily be applied to complex curved surfaces such as piping. A sufficiently thick water absorption layer can be installed. The dew-proof cover can be manufactured extremely easily and efficiently by continuously applying a water-absorbing material to a strip-shaped fibrous support layer, and if the dew-proof cover is made into a rolled tape, it can be easily transported. It is also convenient to store. [Example] Below, an example of this invention will be described in detail. FIG. 1 shows a state in which an embodiment of the dew-proof cover for piping according to the present invention is used, and FIG. 2 shows a cross section of the same dew-proof cover for piping. As shown in the figure, this piping dew-proof cover 2
The water-absorbing layer 4 having water-absorbing and water-retaining properties is provided on the front side of the fibrous support layer 3, and the backing material 5, the water-impermeable layer 6, and the foam layer 7 are provided on the back side.
The impermeable layer 6 and the foam layer 7 are fixed to each other via an adhesive layer 8. The foam layer 7 may be fixed by hot melt lamination or the like, in which the surface of the foam layer is melted and then bonded. As the fibrous support layer 3, a material having a large number of fine voids between fibers, such as a raised fabric or a nonwoven fabric, is preferably used. Nonwoven fabrics include, for example, natural fibers, webs made of staple fibers made of polyester, polyamide, vinylon, polyolefin polymers such as polyethylene and polypropylene, woven or knitted fabrics of filament ears, and filaments of various synthetic fibers. Alternatively, a grid-like net made of spun yarn can be used. The thickness of the fibrous support layer 3 may be extremely thin, usually 1 mm or less. In the fibrous support layer 3, a portion of the water absorbing layer 4 enters into the fine voids between the fibers, so that the water absorbing layer 4 is strongly held and fixed. The water-absorbing layer 4 is not particularly limited as long as it is made of an inorganic compound or an organic compound (including a polymer) that has water-absorbing and water-retaining properties. Examples of the inorganic compound include silica gel, colloidal silica, calcium silicate, diatomaceous earth, vermiculite, and mica. When the water absorption layer is an inorganic compound, its flame retardancy improves the flame retardancy of the piping dew-proof cover. Examples of organic compounds include kraft polymers of starch and acrylates, crosslinked carboxymethyl cellulose, vinyl alcohol and acrylate copolymers, hydrolyzed polyacrylonitrile, crosslinked polyacrylates, and modified polyvinyl alcohol. It will be done. When using the above-mentioned inorganic compounds as the water absorbing layer, aqueous emulsions such as polyvinyl acetate, acrylic, and synthetic rubber latex, especially thermally crosslinkable emulsions with excellent heat resistance of the coating, may be used as the binder. Good to use. However, it is not limited to this. The water absorbing layer 4 can be provided by, for example, applying a mixture of a water absorbing agent and a binder to the fibrous support layer 3. As the backing material 5, a mesh net or the like is used. By providing the backing material 5 on the fibrous support layer 3 in this manner, even if the fibrous support layer is extremely thin, its elongation is prevented and reinforced, so that the work of joining it to the cover body 1 is facilitated. Effects such as facilitation can be obtained. However, this backing material is not necessarily required. As the water-impermeable layer 6, water-impermeable paper, a film made of polyolefin such as polyethylene, vinyl chloride resin, or the like is used. Further, the water-impermeable layer 6 may be formed by coating the back surface of the fibrous support layer 3 with polyolefin, vinyl chloride resin, or the like. Fibrous carrier 3
When the water-impermeable layer 6 is provided on the back surface, the infiltration of moisture from the outside is prevented, and the effect of preventing peeling between the fibrous support layer and the foam layer due to intrusion of moisture can be obtained. However, this impermeable layer 6 is not necessarily required. The thickness of the water-impermeable layer 6 is preferably 200 μm or less. The foam layer 7 is used as a heat insulating layer and is made of a plastic foam material. As this plastic foam material, various known foam materials can be used, and typical examples include polyethylene, polypropylene, ethylene-propylene copolymer, chlorinated polyethylene, ethylene-vinyl acetate copolymer, and these. Examples include polyolefin resins, typified by blended polymers of at least two or more of them, and vinyl chloride resins, such as polyvinyl chloride and copolymers thereof. When a foam layer is provided on the tape as in this example, the thickness of the foam layer is preferably 1 mm to 9 mm. However, it is not limited to this. As shown in FIG. 1, the piping material 2 is
It is used by wrapping it around the pipe 1. Examples of the piping 1 include copper pipes, stainless steel pipes, engineered steel pipes, steel pipes, etc., and are not particularly limited. The condensation-proof cover for piping according to this invention can be easily installed by simply wrapping it around the piping as described above. Moreover, since it has a water absorption layer, it has excellent dew condensation prevention performance. Since the tape can be rolled up, it also has the advantage of not taking up much space for storage. In the above embodiment, the dew-proof cover for piping was provided with a heat insulating layer, but in cases where a heat-insulating layer is previously provided on the surface of the pipe as in the past, a dew-proof cover for piping that does not have a heat insulating layer may be used. It may be hot. Further, even if the pipe is provided with a heat insulating layer in advance, a dew-proof cover for the pipe provided with the heat insulating layer may be used. FIG. 3 shows another embodiment of the condensation-proof cover for piping according to the invention in use, and FIG. 4 shows a cross section of the dew-proof cover for piping. As shown in the figure, here, a foam layer 10 serving as a heat insulating layer is provided in advance on the surface of a pipe 9 that serves as a hot and cold pipe, and a condensation-proof cover 11 for the pipe is wrapped over the foam layer 10. ing. The dew-proof cover 11 for piping has a water absorption layer 4 provided on the front side of a fibrous support layer 3, and a lining material 5 and an impermeable layer 6 on the back side.
and an adhesive 12.
The backing material 5, the water-impermeable layer 6, and the adhesive 12 are not necessarily required. When the dew-proof cover 11 for piping is wrapped around the piping without using an adhesive, it can also be firmly fixed by hot-melt lamination, adhesive, or the like. This embodiment also provides the same effects as the previous embodiment. In the above embodiments, a foam layer is used as the heat insulating layer, but glass wool, rock wool, etc. may also be used. The condensation-proof cover for piping according to this invention is not limited to being used for hot and cold piping, and may be used for other piping such as water piping. Furthermore, it may be used by being wrapped around an elbow, flange, or the like. Next, examples will be described. The dew-proof cover for piping of Example 1 was provided with a water absorbing layer (diatomaceous earth) on the surface of a band-shaped fibrous support layer, and a heat insulating layer (polyethylene foam) on the back surface. This condensation-proof cover for piping was wrapped around a piping provided with a heat insulating layer. However, the thickness of the water absorption layer of the piping dew-proof cover was 0.4 mm, and the thickness of the heat insulation layer was 9 mm. The outer diameter of the entire pipe provided with the heat insulating layer is 28 mm. The condensation-proof cover for piping in Example 2 is the same as that used in Example except that it does not have a heat insulating layer.
This was then wrapped around a pipe provided with the same heat insulating layer as in the previous example. For Examples 1 and 2, changes in water absorption amount of the water absorption layer over time were investigated under the conditions shown in Table 1. The results are shown in Figure 5. The symbols in the figure correspond to the conditions shown in Table 1. In addition, the water absorption amount is 16
is a value corresponding to approximately the maximum water absorption amount of the water absorption layer.

[Effect of idea]

The condensation-proof cover for piping according to this invention is a tape-like condensation-proof cover for piping as a whole, in which a water absorption layer separate from the fibrous support layer is formed on the surface of a band-shaped fibrous support layer. It has a high dew-proofing effect and is easy to install.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state of use of one embodiment of the condensation-proof cover for piping according to this invention, Fig. 2 is an enlarged cross-sectional view of the same embodiment, and Fig. 3 is a condensation-proof cover for piping according to this invention. FIG. 4 is an enlarged sectional view of the same embodiment, and FIG. 5 is a graph showing changes in water absorption over time. 2, 11... Condensation-proof cover for piping, 3... Fibrous support layer, 4... Water absorbing layer, 7, 10... Foaming layer.

Claims (1)

[Claims for Utility Model Registration] (1) A band-shaped fibrous support layer disposed on the surface side of the heat insulating foam layer covering the outer peripheral surface of the pipe, and a fibrous support layer on the surface of the fibrous support layer. is a condensation-proof cover for piping that is entirely tape-shaped and has a separate water-absorbing layer formed on it. (2) The condensation-proof cover for piping according to claim 1, wherein an impermeable layer is provided on the back side of the fibrous support layer. (3) The condensation-proof cover for piping according to claim 1 or 2, wherein the entire back side portion is a heat insulating layer.