JPS61250535A - Tape for detecting leakage of water - Google Patents

Abstract

PURPOSE:To attain to enhance the detection accuracy of the leakage of water by judging the leakage of water by the blotch of a coloring material, by adhering a tape prepared by printing, coating or impregnating paper or a fiber with a water-soluble coloring material to the joint part of piping. CONSTITUTION:A water leakage detecting tape 1 prepared by printing, coating or impregnating paper or a fiber with a water-soluble coloring material is adhered to the outer peripheral surface of the joint part of pipe members 2, 3 formed by clamping both tube members 2, 3 by a bolt 5 in such a state that a packing 4 is interposed between both tube members 2, 3. The adhesion of the tape 1 is performed by preliminarily applying an adhesive such as a size to the peripheral edges of the back surface of the tape 1 over the entire periphery thereof. In order to easily discriminate the blotting of the tape 1, a proper picture pattern or line is displayed on the surface of the tape by ink or a paint.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a tape for detecting water leaks in piping.

"Problems to be Solved by the Prior Art and the Invention" Joints between pipe members such as air conditioning pipes, water supply and drainage pipes, and steam pipes are constructed by bolting with a gasket interposed. After the piping is completed, we run pressurized water to visually check for water leakage from the joints. This check is time-consuming because there are many joints in the piping and it is difficult to see with the naked eye.

``Means for Solving the Problems'' Therefore, in view of the above circumstances, the present invention provides a water-soluble water-soluble material, which is obtained by printing, coating or impregnating a water-soluble coloring material on a fiber or fiber with a synthetic resin interposed therebetween if necessary. The present invention provides a leak detection tape.

``Operation'' Tape made by printing, coating, or impregnating a water-soluble coloring agent on the fibers or fibers is pasted not only on the joints of the pipes but also on other parts where there is a possibility of water leakage. , Water leakage is determined by the bleeding of the coloring material.

``Example'' Water-soluble coloring material Water-soluble dyes such as direct dyes, acid dyes, basic dyes, cationic dyes, vat dyes, reactive dyes, acidic mordant dyes, or metal-containing complex dyes are used. .

Paper or fiber Although there are no particular restrictions, paper that is easily permeable to water such as medium-quality paper, rough paper, or filter paper is preferable to paper that is difficult to permeate with water such as coated paper or high-quality paper. Furthermore, fibers, woven fabrics, or nonwoven fabrics that are easily permeable to water can also be used.

Synthetic resin Although not essential, it is preferable to use the synthetic resin to attach (fix) the coloring material to the paste or fibers. The synthetic resin is not particularly limited, but it is not preferable to use a synthetic resin that provides a too strong coating and does not allow the coloring material to be eluted. In that sense, water-soluble synthetic resins that form a dry film by evaporation of water or organic solvents, or organic solvent-soluble synthetic resins such as emulsion synthetic resins, gravure ink synthetic resins, and oil-based lacquer paint synthetic resins are preferred. .

Amount of Colorant to be Used The amount of colorant to be used is not particularly limited, but if the colorant concentration is too low, it will be difficult to distinguish between colors, so it is appropriate to use 1% or more in the ink or paint film. In addition, when impregnating yam or fibers, 061
% or more is appropriate. Conversely, the upper limit of the colorant concentration is determined by the viscosity of the ink or paint at the time of its preparation, the concentration of the dye dissolved in the aqueous dye solution used to impregnate paper or fibers, and other factors. The cost of manufacturing the ink or paint also has an impact. Therefore, a suitable upper limit is about 50% of the amount used in the ink or paint film, and about 10% of the paper or fiber.

"Specific Examples" Dye used Suminol Fast Red G (trade name of acidic dye made by Sumitomo Chemical Co., Ltd.) Sumiacryl Red N-3L (trade name of cationic dye made by Sumitomo Chemical Co., Ltd.) Varnish used Varnish 1 (styrene/maleic acid based) Water-soluble resin) Varnish 2 (Methylcellulose-based water-soluble resin) Gravure varnish (consisting of rosin Ca salt) A5 Ink formation As described above, predetermined amounts of varnish, diluent, and dye are taken and converted into ink.

Spread the above ink onto medium-quality paper with a thickness of about 10 μm, and dry at room temperature.

Impregnation of filter paper A filter paper is impregnated with a 1% aqueous solution of an acidic dye and a 5% aqueous solution of a cationic dye, and then air-dried. The resulting colored filter paper is sandwiched between white filter papers.

Water spot test: Tap water was dripped onto the tape prepared as described above in spots and bleeding was observed. The results are as follows.

The tape 1 is attached to the outer peripheral surface of a joint formed by interposing a packing 4 between a pipe member 2 and a pipe member 3 and tightening them with bolts 5, as shown in the drawings. To attach the tape 1, an adhesive such as glue is applied to the entire circumference of the back surface of the tape 1.

In addition, appropriate patterns or lines are displayed on the surface of the tape using the above-mentioned ink or paint so that bleeding on the tape can be easily determined. If the distance between the lines is narrow, it is easy to distinguish between blurs.

``Effects of the Invention'' As described above, the present invention is a water leak detection tape made by printing, coating, or impregnating water-soluble coloring material on the water soluble coloring material or fibers, and is capable of shortening even the smallest amount of water leakage. Can be detected by time. It takes 1 to 2 days to detect water leaks in the past, but it can be done in a shorter time, improving the efficiency of water leak detection work. In addition, even a small amount of water leakage can be detected, which improves water leakage detection accuracy.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing a state in which the tape of the present invention is attached to a joint portion of a pipe.

Claims (1)

[Claims] (1) Water leak detection tape made by printing, coating, or impregnating paper or fiber with a water-soluble coloring material