JP2003139757A - Submerged time indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indicator used while bonded to a product submerged in water for a prescribed time, and for detecting surely and easily an accurate submerged time visually by discoloration thereof without being submerged in water for measurement. SOLUTION: In this submerged time indicator 1, a moisture permeable sheet 12 is layered onto a moisture indicator containing sheet 13 attached onto a base sheet 15 comprising a water-impermeable resin, and coated with a protection sheet 11 comprising the water-impermeable resin while exposing one portion. When the indicator is bonded to be submerged in the water, the submerged time is surely and accurately detected by a length of the clear discoloration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicator which is used by being attached to a product which is immersed in water for a predetermined time and which can visually detect the immersion time by a change in color.

[0002]

2. Description of the Related Art As a product used after being immersed in water for a predetermined time, there is, for example, Cement Capsule Q-Tight (trade name of NOF Giken Kogyo Co., Ltd.) which is a non-woven bag containing cement mortar. Cement capsules are used as an adhesive for post-installed anchors that connect the reinforced concrete skeleton and the wall materials attached to it, because water enters the cement capsules for a certain period of time and mixes with cement mortar at an appropriate ratio. .

If the immersion time is shorter than a predetermined value, water does not penetrate sufficiently, so that the ratio is not proper. If it is too long, the setting and hardening of cement mortar starts in water, and in both cases, the post-installed anchor cannot be bonded. Therefore, it is necessary to strictly measure the immersion time.

Conventionally, a stopwatch has been used to measure the immersion time. However, time measurement is troublesome.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides an indicator that can detect an accurate immersion time simply and reliably without measuring the immersion time in water. The purpose is to

[0006]

DISCLOSURE OF THE INVENTION An underwater immersion time indicator 1 of the present invention made to achieve the above object comprises:
Explaining with reference to FIG. 1 corresponding to an example, a water permeable sheet 12 is superposed on a moisture indicator containing sheet 13 provided on a base material sheet 15 made of a water impermeable resin, and a part thereof is exposed. However, it is covered with a protective sheet 11 made of a water impermeable resin.

It is preferable that the water-permeable sheet 12 has a strip shape and one end thereof is exposed.

The water-permeable sheet 12 is preferably a water-soluble resin film made of any one of polyvinyl alcohol, partially saponified polyvinyl acetate, and a copolymer of vinyl alcohol and vinyl acetate. More specifically, Hyselon (trade name of Nippon Synthetic Chemical Industry Co., Ltd.) can be mentioned. Since the water-soluble resin film has adhesiveness, it adheres to the moisture indicator containing sheet 13 and the protective sheet 11. The water-soluble resin film is gradually dissolved in water, for example, from one exposed end of the water-soluble resin film toward the inside, as the time of immersion in water elapses. This water that dissolves and penetrates the water-soluble resin film,
The moisture indicator containing sheet 13 is wetted and discolored.

The water-permeable sheet 12 may be paper or non-woven fabric. More specifically, MISHIMA D
ISSOLVE PAPER (trade name, manufactured by Mishima Paper Co., Ltd.) is mentioned. Among the papers, the Japanese paper having 30 to 70 g / m ² is more preferable, and the paper having 30 to 40 g / m ² is even more preferable. Paper and non-woven fabrics are water absorbent. The paper or the like gradually absorbs and permeates water with the passage of immersion time in water, for example, from one exposed end to the inside. This water makes the paper or the like semi-transparent and wets the moisture indicator containing sheet 13 to change its color, or disperses the indicator from the moisture indicator containing sheet 13 to the paper or the like to change the color of the paper or the like.

The longer the time corresponding to the immersion time in water, the wider the range of this discoloration.

The water permeable sheet 12 has a thickness of 10 to 50.
It is preferably 0 μm. If it is thinner than 10 μm, the water permeability becomes poor, and if it is thicker than 500 μm, water permeates very quickly, and in either case, the immersion time and the discolored range do not correspond to each other. 15-300 μm
Is more preferable. The thinner this thickness, the slower the water penetrates.

The water-indicator-containing sheet 13 is hard to penetrate into water, and is a sheet containing an acid-base indicator and an acidic substance or a basic substance as a moisture indicator, and a diffusible water-based ink is printed as a moisture indicator. An example of the sheet is shown. More specifically, a quick dry book (trade name of Mishima Paper Co., Ltd.) that reversibly changes color with water can be mentioned.

The protective sheet 11 and the base sheet 15 are preferably polyethylene, polypropylene, or polyethylene terephthalate films. More specifically, Super Stick PET25 or SSPP20 (both are trade names of Lintec Co., Ltd.)
Is mentioned.

The side of the protective sheet 11 covering the water-permeable sheet 12 is the surface where the range of discoloration can be observed.

The substrate sheet 15 to which the moisture indicator containing sheet 13 is attached may have an adhesive layer 16 and a release paper 17 covering the adhesive layer 16 on its back surface.

The base material sheet 15 may be provided with an adhesive layer 14 to which the protective sheet 11 and the moisture indicator containing sheet 13 are attached.

The adhesive used to form the adhesive layers 14 and 16 is, for example, Scotch VHB 9460.
(Product name of Sumitomo 3M Limited).

Instead of sticking the protective sheet 11 and the moisture indicator containing sheet 13 by the adhesive layer 14 and the base sheet 15, both sheets 11 using a heat sealer.
15 may be heat fusion.

As shown in FIG. 2, the protective sheet 11 and the base sheet 15 are attached or heat-sealed so as to cover the other end of the water-permeable sheet 12 having only one end exposed to the outside. Preferably.

The water immersion time indicator 1 is preferably provided with a scale 20 on the protective sheet 11 along the water permeable sheet 12. The width of the discoloration range that spreads according to the immersion time in water is the discoloration boundary 2 at the tip of this range.
It is proportional to the length L up to 1.

When the immersion time indicator in water is used, the discoloration is clear, so that the immersion time can be reliably detected visually.

[0022]

Embodiments of the water immersion time indicator to which the present invention is applied will be described in detail below.

FIG. 1 is a sectional view of an underwater immersion time indicator 1.

In the water immersion time indicator 1, a moisture indicator-containing sheet 13 is attached to an adhesive layer 14 formed on a base material sheet 15. The moisture indicator-containing sheet 1
The water-permeable sheet 12 is superposed on the sheet 3, and the protective sheet 11 with the scale 20 covers the water-permeable sheet 12.

The protective sheet 11 and the base material sheet 15 are bonded to each other with the pressure-sensitive adhesive layer 14 while exposing one end of the water-permeable sheet 12 and the moisture indicator containing sheet 13 while covering the other three ends thereof. On the back surface of the base material sheet 15, another pressure-sensitive adhesive layer 16 is provided and a release paper 17 is attached.

The submersion time indicator 1 is used by being attached to a product which is immersed in water and whose time is to be accurately detected.

Taking the water immersion time indicator 1 in which the water-permeable sheet 12 is a water-soluble resin film as an example, the operation mechanism for displaying the immersion time by discoloring when the indicator 1 is immersed will be described as follows. Is.

When the indicator 1 is immersed in water, the water-soluble resin film 12 exposed at one end starts to dissolve in water. As the immersion time in water elapses, water further dissolves the water-soluble resin film 12 inside and penetrates to a range corresponding to the immersion time in water.

When the permeated water and the moisture indicator containing sheet 13 come into contact with each other, the moisture indicator thereof develops a color. Since the water-soluble resin film 12 becomes transparent when dissolved, the color emitted from the moisture indicator containing sheet 13 becomes visible through the protective sheet 11, and as a result, discoloration of the indicator 1 is observed as shown in FIG.

As the immersion time in water elapses, the length L to the discoloration boundary 21 which is the tip of the range where the water penetrates and discolors
Becomes longer. Since there is a correlation between the immersion time in water and the length L to the discoloration boundary, the immersion time in water can be accurately detected by measuring this length L.

When the thickness of the water-permeable sheet 12 is reduced,
Since the water penetrates slowly, an indicator with an appropriate thickness is selected and used according to the desired immersion time.

When the indicator 1 in which the water-permeable sheet 12 is paper or a non-woven fabric is soaked in water, the paper or the like absorbs and permeates water, and the indicator of the water-indicator-containing sheet brought into contact with the water changes color. Through the translucent paper, etc.
Discoloration is observed.

Examples of prototypes of water immersion time indicators to which the present invention is applied are shown below as Examples 1 to 5, and examples of indicators to which the present invention is not applied are shown as Comparative Examples 1 and 2.

(Example 1) Super Stick PET25 (trade name of Lintec Co., Ltd.) which is the base material sheet 15
Scotch VHB 9460 (trade name of Sumitomo 3M Ltd.), which is an adhesive, is applied to one surface of the
Was formed. A quick dry book (trade name of Mishima Paper Co., Ltd.), which is a moisture indicator sheet 13 smaller than the base sheet 15,
The adhesive layer 14 was attached to almost the center. Base sheet 1
Water-permeable sheet 12 slightly larger than 5 thickness 60
μm MISHIMA DISSOLVE PAPER
MAP (trade name of Mishima Paper Co., Ltd.) is used so that one end thereof is aligned with the edge of the base sheet 15 and the base sheet 1
It was placed on 5 and brought into close contact. A protective sheet 11 having the same scale as the base sheet 15 and having a scale along the water-permeable sheet 12
Then, the water-permeable sheet 12 was covered and adhered. The protective sheet 11 so as to cover the other three ends of the water-permeable sheet 12.
And the periphery of the base material sheet 15 were bonded together by the pressure-sensitive adhesive layer 14 to obtain an underwater immersion time indicator.

(Examples 2 to 5) Water-permeable sheet M
ISHIMA DISSOLVE PAPER MAP
Were obtained in the same manner as in Example 1 except that the thicknesses thereof were 120, 180, 240, and 300 μm, to obtain submersion time indicators in Examples 2 to 5, respectively.

Comparative Example 1 Edible red 4 which is a water-soluble dye
No. 1 (manufactured by Sanei Chemical Industry Co., Ltd.) and an ink vehicle in which 9% by weight of a resin of ethyl cellulose (Ethocel: manufactured by Dow Chemical Co., Ltd.) is dissolved in 90% by weight of xylene. Was prepared. Filter this (N
o. 4: Screen-printed on Advantech Toyo Co., Ltd.) to obtain an indicator for detecting water that has permeated the filter paper.

Comparative Example 2 9 parts by weight of ethyl cellulose (trade name of Ethocel: a product of Dow Chemical Co., Ltd.) was dissolved in 90 parts by weight of diethylbenzene. ) Company)
An ink was prepared by adding 1 part by weight and kneading with a ladle machine. This ink was screen-printed on synthetic paper Yupotak (trade name, manufactured by Dainippon Ink and Chemicals, Inc.) to obtain an indicator.

Immersion time in water of the obtained Examples 1 to 5 When the indicator was immersed in water, the time required for the length L of the discolored range of the indicator to reach 5, 10, 20, 30 mm was measured. did. The results are shown in Table 1.

[0039]

[Table 1]

As is clear from Table 1, the immersion time in water can be accurately detected by measuring the discoloration length L. Also, the thinner the water-permeable sheet, the longer it takes to reach a certain discoloration length. Therefore, it has been clarified that a desired immersion time in water can be detected by using an indicator in which the water-permeable sheet has an appropriate thickness.

Then, using the water immersion time indicator of Example 1 and the indicators of Comparative Examples 1 and 2, a dew condensation test, a water drop test and an underwater immersion test were performed to observe the presence or absence of discoloration. The results are shown in Table 2.

[0042]

[Table 2]

As is clear from Table 2, the water immersion time indicator of Example 1 to which the present invention is applied does not change color unless it is immersed, whereas the indicators of Comparative Examples 1 and 2 to which the present invention is not applied are The color changed with a slight amount of water such as dew condensation or water dripping.

[0044]

As described above in detail, the underwater immersion time indicator of the present invention can visually detect the underwater immersion time without measuring the time after the immersion.

When this indicator is applied to a product which must be immersed in water for a predetermined time and then used, the product can be reliably and accurately detected due to the length of clear discoloration. This indicator can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an underwater immersion time indicator to which the present invention is applied.

FIG. 2 is a top view showing an underwater immersion time indicator to which the present invention is applied during use in water.

[Explanation of symbols]

1 is a water immersion time indicator, 11 is a protective sheet, 1
2 is a water permeable sheet, 13 is a water indicator containing sheet, 1
4.16 is an adhesive layer, 15 is a base sheet, 17 is release paper, 20 is a scale, 21 is the tip of the color changing range, and L is the length of the color changing range.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01N 33/42 G01N 33/42

Claims (4)

[Claims] 1. A water-permeable sheet is superposed on a moisture-indicator-containing sheet attached to a base sheet made of a water-impermeable resin, and a part of the water-permeable sheet is exposed to cover with a protective sheet made of a water-impermeable resin. An immersion time indicator in water characterized by being 2. The water-permeable sheet is a water-soluble resin film, paper or non-woven fabric made of any one of polyvinyl alcohol, partially saponified polyvinyl acetate, and a copolymer of vinyl alcohol and vinyl acetate. The submersion time indicator in water according to claim 1. 3. The water-permeable sheet has a thickness of 10-5.
The immersion time indicator in water according to claim 1, wherein the indicator is 00 μm. 4. The underwater immersion time indicator according to claim 1, wherein a scale is provided on the protective sheet along the water permeable sheet.