JP5335451B2 - Humidity sensor - Google Patents

Description

  The present invention relates to a humidity sensor that detects humidity.

  Humidity management is widely carried out in many industrial fields including transportation and storage of goods, and various types of humidity sensors for sensing humidity have been proposed.

JP 2006-17599 A

None

  A moisture sensor is fixed on a seal-like substrate, and the humidity sensor detects the humidity by the hue change or spreading of the moisture when the moisture-sensitive material absorbs moisture. It is widely used because of its goodness.

  However, many of these existing humidity sensors are difficult to understand because they attempt to detect changes in humidity based on relative changes such as the size of bleeding and changes in hue, and are based on moisture sensitive materials. The work of fixing on the material also had to be done manually, and there were problems such as difficulty in mass production and high manufacturing costs.

  The present invention aims to solve the above-mentioned problems of the seal-type humidity sensor. By adopting a display mechanism completely different from the conventional one, the fact of humidity sensing is clearly displayed. We intend to provide a humidity sensor suitable for mass production.

  An ink-like kneaded mixture of hygroscopic porous fine particles, starch paste, colorant, and water on the back side of a paper piece 1 obtained by cutting a paper sheet having a porous fine particle layer 6 formed on the front side into an appropriate size. The said subject was solved by apply | coating the moisture-absorbing material 2 to spot shape, and making it dry and forming the moisture-sensitive part 3. FIG.

  As shown in FIG. 3, the side on which the moisture-sensitive part 3 is formed, that is, the back side is pasted so as to be in contact with the surface of the installation location and used. In this state, the moisture in the atmosphere at the installation location penetrates into the paper piece 1 from the surface side of the paper piece 1 and is taken into the pores of the porous part particles in the moisture sensitive part 3, but the atmospheric humidity exceeds the set value. Then, the water overflows with the colorant and moves to the surface side as shown by the arrow in FIG. 4 so that the spot-like coloring mark 4 appears on the surface. The surface side of the paper piece 1 is coated with porous fine particles to form a porous fine particle layer 6. The voids of the porous fine particles are narrower than the voids formed by the paper fibers, and absorb moisture. Since the capillary force that is the driving force is large, the water accompanying the colorant is strongly sucked up to the surface side of the paper piece 1 by the capillary phenomenon, and does not diffuse inside the paper piece 1 but vividly develops on the surface of the paper piece 1 The mark 4 is formed, and almost no blurred blur is formed around it. The starch paste in the hygroscopic material 2 serves as a binder for fixing the porous fine particles and the colorant to the paper piece 1, but the starch paste itself is water-soluble, so that moisture enters the porous fine particles. There is nothing to prevent.

  In this way, the coloring mark 5 accompanied with the color appears vividly on the surface of the paper piece 1 that had nothing before, with the setting humidity being exceeded, thereby displaying the fact that the setting humidity has been exceeded.

  Therefore, it is much easier to understand than the conventional humidity sensor that knows the fact that the set humidity has been exceeded due to the change in hue and the size of bleeding. Further, since the moisture absorbent material 2 is in the form of ink, a humidity sensor can be configured simply by applying it to the back side of the paper piece 1 in a spot form, so that the productivity is excellent and the manufacturing cost is low. It is. Further, the moisture sensitive part 3 made of the moisture absorbent material 2 is formed on the back side of the paper piece 1 and does not diffuse widely into the paper piece 1 when the set humidity is exceeded. Since the wax type moisture sensor used can be installed on the same piece of paper, the humidity and temperature can be managed simultaneously.

1 is an enlarged perspective view of a humidity sensor according to Embodiment 1 of the present invention. FIG. Similarly, the perspective view seen from the back side. Similarly, the expanded sectional view which showed the condition affixed on the installation location surface. Similarly, an explanatory view schematically illustrating a mechanism for forming a color mark when the set humidity is exceeded. Similarly, the perspective view seen from the surface side which showed the condition where the color development mark was formed on the surface side by excess of setting humidity. The perspective view seen from the back surface side of the other Example.

  An ink-like kneaded mixture of hygroscopic porous fine particles, starch paste, colorant, and water on the back side of a paper piece 1 obtained by cutting a paper sheet having a porous fine particle layer 6 formed on the front side into an appropriate size. The moisture absorbing material 2 is applied in a spot shape and dried to form the moisture sensitive portion 3.

  FIG. 1 is a sectional view of an embodiment of a humidity sensor according to the present invention, and FIG. 2 is a perspective view seen from the back side thereof. In the figure, reference numeral 1 denotes a piece of paper serving as a base material. One side (surface side) of a paper body 4 in which natural cellulose is formed into a thin leaf shape in the presence of water, is coated with porous fine particles such as silica gel. The paper sheet on which the fine particle layer 6 is formed is cut into an appropriate size. This type of paper sheet is referred to as inkjet paper and is widely available as image recording paper for inkjet printers.

  And the moisture absorption material 2 is apply | coated to the back surface side of this paper piece 1 in the spot shape, and the moisture sensitive part 3 is formed. The hygroscopic material 2 is the most important constituent element of the present invention, and is an ink-like substance obtained by adding water to porous fine particles having high hygroscopic properties such as silica gel, starch paste, and colorant and kneading them. In addition to silica gel, zeolite and the like can be used as the porous fine particles. As the colorant, both pigments and dyes can be used.

The mixing ratio of porous fine particles, starch paste, colorant, and water depends on the conditions of use, so it cannot be specified unconditionally, but the porous fine particles are increased or decreased according to the set humidity. As the set humidity to be sensed is higher, the blending ratio of the porous fine particles is increased.
After the moisture absorbent material 2 is applied to the paper piece 1, the moisture therein evaporates to dry and become a solid moisture-sensitive part 3.

  The humidity sensor shown in FIG. 1 and FIG. 2 has only one humidity sensing part 3 formed. However, as shown in FIG. 6, the set humidity is 10%, 20%, and 30%. A plurality of different moisture sensitive portions 3 may be formed.

  As shown in FIG. 3, the humidity sensor according to this embodiment is used by attaching the side where the moisture sensitive portion 3 is formed, that is, the back surface side so as to be in contact with the surface of the installation site. In this state, moisture in the atmosphere of the installation location enters the paper piece 1 from the surface side of the paper piece 1 and is taken into the pores of the porous part particles in the moisture-sensitive part 3, but the atmospheric humidity has a set value. If it exceeds, the moisture will overflow from this along with the colorant, move to the surface side as shown by the arrow in FIG. 4, and the spot-like colored mark 4 appears on the surface as shown in FIGS. . In addition, porous fine particles are coated on the surface side of the paper piece 1 to form a porous fine particle layer 6, but the voids of the porous fine particles are narrower than the voids formed by the fibers of the paper body 7, and moisture content is reduced. Since the capillary force, which is the driving force for absorption, is large, the water accompanying the colorant is strongly sucked up to the surface side of the paper piece 1 by capillary action, and does not diffuse into the paper body 7 of the paper piece 1, but the paper piece 1. A clear coloring mark 4 is formed on the surface of the film, and an unclear blur is hardly formed on the periphery thereof. The starch paste in the hygroscopic material 2 serves as a binder for fixing the porous fine particles and the colorant to the paper piece 1, but the starch paste itself is water-soluble, so that moisture enters the porous fine particles. There is nothing to prevent.

  In this way, on the surface of the paper piece 1 that had nothing before, the colored mark 5 accompanied by the color appears vividly with the set humidity being exceeded, thereby displaying the fact that the set humidity has been exceeded.

Therefore, it is much easier to understand than the conventional humidity sensor that knows the fact that the set humidity is exceeded by the change in hue and the size of the blur. In addition, since the moisture absorbent material 2 is in the form of ink, a humidity sensor can be configured simply by applying it to the back side of the piece of paper 1 in a spot shape, so it has excellent productivity and manufacturing cost. It is inexpensive.
Furthermore, the moisture sensitive part 3 made of the moisture absorbent 2 is formed on the back side of the paper piece 1 and does not diffuse widely into the paper piece 1 when the set humidity is exceeded. Since the wax-type temperature sensor used can be installed on the same piece of paper, the humidity and temperature can be managed simultaneously.

  It can be used in all industrial fields that require humidity control, including transportation and management of goods.

DESCRIPTION OF SYMBOLS 1 Paper piece 2 Hygroscopic material 3 Humidity sensing part 4 Color development mark 6 Porous fine particle layer 7 Paper body

Claims (2)

  On the back side of the paper piece (1) obtained by cutting the paper sheet on which the porous fine particle layer (6) is formed on the front surface side, hygroscopic porous fine particles, starch paste, colorant and water. A humidity sensor, wherein the kneaded ink-like moisture absorbent material (2) is applied in a spot shape and dried to form the moisture sensitive portion (3).   The humidity sensor according to claim 1, wherein the porous fine particles constituting the hygroscopic material (2) are silica gel.

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