JPS62177398A - Method of forming heat-insulating layer of piping, etc. and sheet for heat insulation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for forming a heat insulating layer for piping, etc., and a heat insulating sheet.

(Prior art) Conventional methods for keeping pipes warm include wrapping a heat insulating material or heat insulating material around the pipe, or attaching a pair of half-shaped heat insulating materials from both sides of the pipe and fixing them by wrapping tape. After that, it is common to paint as necessary. Further, as the heat insulating material, asbestos, rock f cool, glass wool, polystyrene foam, etc. are used.

(Problems to be Solved by the Invention) However, with this type of heat insulating material, it is extremely difficult to cover curved and bent parts of the pipes, and gaps are created between the pipes and the heat insulating material, resulting in a poor heat retaining effect. There are drawbacks to reducing this. Also,
Insulating materials are wrapped and fixed with tape, which takes time to process and is not easy to work with. Furthermore, the outer periphery of the heat insulating material must be painted and dried if necessary, which lengthens the construction period.

(Objective of the Invention) The present invention has been made in view of the above circumstances, and its purpose is to provide a structure that can be easily installed without creating gaps even in bent portions of pipes and valves, and has excellent workability and heat retention. An object of the present invention is to provide a method for forming a heat insulating layer for piping, etc., and a heat insulating sheet.

(Means for Achieving the Object) In order to achieve the above object, the present invention employs a new heat-insulating sheet in which a thermally expandable foam coating agent is applied on a base film.

In addition, when forming a heat insulating layer on piping, the heat insulating sheet is cut to a predetermined length to cover the pipe, the joints of the sheet are bonded together by heat, the remaining film is removed, and finally the sheet is heated. The structure is such that the foam coating agent inside is foamed.

For piping that requires only a thin heat insulating layer (low foaming), use a heat-shrinkable or biaxially stretchable base film; for piping that requires a thick heat retaining layer (high foaming), use the base film. An aluminum vapor-deposited film is used for the film.

(Function) The heat retaining sheet with the above structure foams when heated and presses against the outer surface of the piping, so there is no gap between the sheet and the piping.For this reason, the installation of the sheet is sometimes It does not require much pressing force, which reduces the labor of the worker.

Moreover, by the method of forming a heat insulating layer having the above structure, the sheet can be easily attached to curved pipes and valves with complicated shapes. Since the sheet can be colored in advance, it is also possible to use JIS piping identification colors or print letters, symbols, etc., if necessary.

Therefore, on-site painting and drying processes are not required.

(Example) FIG. 1 shows a heat-retaining sheet 10 according to the present invention. This sheet 10 is formed by applying a foam coating agent 12 to the surface of a base film 11. In this example, we used a foam coating agent called "Thermocell" (trade name), which has a 1200 to 130
The butane gas inside expands and foams at ℃, and the thickness after expansion reaches 4 to 15 times.

The foamed coating agent 12 is applied to the center of the base film 11 leaving both side edges, and marks 13 are provided on both side edges of the base film 11 along the longitudinal direction.

This sheet 10 is rolled up in advance into a roll and the required amount (
It is desirable to be able to pull out the J3.

Detailed cross-sectional views of the sheet 10 are shown in FIGS. 2(A) to 2(E). In FIGS. 2(A) and (E), the heat shrink film 11
A foamed coating agent 12 is applied to a, and the outer surface of the pipe 14 is further covered with a heat-shrinkable film 11a or 2@stretchable film 11e. This sheet structure is sufficient when forming a thin, low-foam retention a layer.

When forming a thick heat retaining layer by highly foaming, please use the method shown in Figure 2 (
As shown in B), an aluminum vapor-deposited film 11b is used as the base film. Therefore, when the foam coating agent 12 thermally expands, the foam coating agent 1
2 comes into strong pressure contact with the pipe 14. In addition, heat from the piping is reflected by the aluminum vapor-deposited film 11b,
The heat retention effect of the sheet increases.

In order to increase the strength of the heat insulating layer, glass wool 15 is impregnated with foamed coating agent 12 and bonded to heat shrinkable film 11a, as shown in FIG. 2(C). Furthermore, if both high foaming and reinforcement are required, the aluminum vapor-deposited film 11b and the foam coating agent 12 impregnated into the glass wool 15 may be combined as shown in FIG. 2 (D>). A filter material or a nonwoven fabric may be used instead of the glass wool 15.

Next, a method for attaching the heat insulating sheet 10 will be explained.

First, the rolled sheet 10 is pulled out and cut to a required length as shown in FIG. Subsequently, as shown in FIG. 4, the piping 14 is covered with the foamed coating agent 12 on the inside, and both ends of the sheet 10 are overlapped so that the marks 13 are aligned. As can be seen from FIGS. 1 and 3, both sides of the sheet 100 include only the base film 11, so the overlapping portions are easily joined when heated.

Next, the mating portion is cut out as shown by the broken line in FIG. If the piping to be covered is long, please refer to Figure 6 (△
) As shown in FIG. 6(B), after installing the sheets 10 in two and three stages, the seam 16 is attached to the seam h1 as shown in FIG. 6(B).
The seam 16 is covered with a film 11 of the same color and the same thickness as the outer skin of No. 0.

Finally, as shown in FIG. 7, when hot air or far infrared heaters 17 are brought into contact with the outer surfaces of the seams 1 to 10 to heat them, the foamed coating agent 12 expands and foams to adhere to the outer surface of the piping 14. Further, the heat-shrinkable base film 11 shrinks and tightly adheres to the outside of the foamed coating agent 12 .

The heater 17 consists of a ring 18 and a handle 19.
A cable 20 and a plug 21 are connected to the terminal end of the cable 9. In addition, the ring 18 can be used with piping of various diameters by splitting and expanding the tip.
When the plug 21 is inserted into an outlet, it generates heat.

Therefore, when the ring 18 is fitted onto the sheet 10 and moved up and down, the foam coating agent 12 inside will foam.

In addition, the foam coating agent 12 can be heated from the inside by passing high-temperature steam of 120° C. or higher into the pipe 14.
may be foamed.

Since the sheet 10 can be colored, it is colored in advance (
By doing so, it is possible to omit the conventional painting and drying process on site. Since the outside of the sheet 10 is the base film 11, the appearance after construction can be finished beautifully. The base film 11 and the foamed coating agent 12 used for the sheet 10 are easy to cut, so they can be used for piping-like materials with complex shapes.

(Effects of the Invention) As explained above, if the method for forming a heat retaining layer and the heat retaining sheet of the present invention are adopted, the sheet can be easily applied to bent parts of piping or places with complicated shapes without creating gaps. It is easy to install and provides excellent heat retention.Also, since the outer surface is a colorable film, it looks beautiful after installation and maintains harmony with the surroundings.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a heat-retaining sheet according to the present invention, and Fig. 2 (
A) to (E) are enlarged sectional views of the seat, FIG. 3 is a plan view of the cut sheet, FIGS. 4, 5, and 6 are perspective views showing how the seat is installed, and FIG. 7 is a perspective view showing how the seat is installed. It is a perspective view which does not show the heating foaming state by a heater. In the figure, 10. ...Heat insulation sheet, 11...Base film, 12...Foam coating agent, 14...Piping, 15...Glass wool.

Claims (11)

[Claims] (1) A step of applying a thermally expandable foam coating agent to a base film to form a heat-retaining sheet, and a step of cutting this sheet into a predetermined length to cover a heat-retaining material;
A method for forming a heat insulating layer for piping, etc., which includes the steps of gluing the sheet joints after being coated, and heating and foaming the foam coating agent of the sheet. (2) The method for forming a heat insulating layer for piping or the like according to claim 1, wherein the bonded portions of the sheets are heat-bonded and excess film is removed. (3) The method for forming a heat retaining layer for piping and the like according to claim 1, wherein the heating and foaming step is performed using high-temperature steam sent into the piping. (4) The method for forming a heat retaining layer for piping or the like according to claim 1, wherein the heating and foaming step is performed using an external heater. (5) A heat insulation sheet for piping, etc., which is formed by forming a thermally expandable foam coating agent on a base film. (6) The foamed coating agent is applied to the center part of the base film leaving both side edges.
Insulating sheet for piping, etc., as described in section. (7) The heat-insulating sheet for piping and the like according to claim 5, wherein glass wool is impregnated with the foam coating agent. (8) The heat-retaining sheet for piping and the like according to claim 5, wherein the base film has heat shrinkability. (9) The heat-retaining sheet for piping and the like according to claim 5, wherein the base film is an aluminum vapor-deposited film. (10) The heat-retaining sheet for piping and the like according to claim 5, wherein the base film has biaxial stretchability. (11) The heat insulation sheet for piping, etc. according to claim 6, wherein marks for positioning are formed on both side edges of the base film.