JPH0339559Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a tatami mat equipped with insecticidal marking material.

(Prior Art) Japan's climate is hot and humid, and houses have excellent airtightness due to the widespread use of sashes. Therefore, the conditions are such that it is easy for mites to occur in large quantities. Particularly in houses that have been newly built for a year, a large amount of lint may occur on the tatami mats. This is due to insufficient methods of killing insects on tatami. There are two methods of killing mites and other insects that are attached to tatami mats: one using chemicals and the other using heat.

(Problem that the invention aims to solve) It is difficult to kill insects such as mites that have penetrated deep into the interior of tatami mats using chemical insecticidal methods, and it has been observed that they crawl out to the surface of tatami mats through needle holes, etc. There is. Additionally, there were problems with eggs being ineffective for drugs and the durability of the drug's effectiveness.

Insecticidal methods using heat are certain to be effective if the specified heat treatment is applied. However, there was a problem in that it was not possible to confirm whether the heat treatment had been completely carried out.

(Means for solving the problem) A tatami mat equipped with an insecticidal marking material according to the present invention is as follows. At least one of the front and back surfaces of a tatami floor made of rice straw is provided with an insecticidal indicator material coated with or impregnated with a temperature indicator that irreversibly changes color at a specific temperature.

(Function) When the tatami mat is placed in a dielectric heating furnace and heat treated at 80°C for 5 minutes, the insecticide labeling material changes color.

(Example) FIGS. 1 and 2 show an example of a tatami mat provided with an insecticidal marking material according to the present invention.

1 is a tatami floor made of rice straw, and insecticide marking material 2 is attached to the back side of the tatami floor 1. 3 is tatami floor 1
5 is the hem cloth covering the surface of the tatami mat. Further, 6 is a thread for sewing together the rice straw stacked vertically and horizontally, and 7 is a thread for sewing the hem cloth 5 and the tatami facing 3.

The insecticidal marking material 2 is used when heat-treating the tatami floor by dielectric heating, so that a third party can confirm that the heat treatment has been carried out evenly throughout the floor. It can be seen with the naked eye that the heat treatment has been completely carried out, and troubles in the production process or sales can be avoided. This is because if mites or the like occur later, it becomes clear whether the treatment at the time of making the tatami was insufficient or whether it was handled improperly at a later date.

The insecticidal indicator material 2 is obtained by coating or impregnating a base material made of paper or nonwoven fabric with a temperature indicator that irreversibly changes color depending on temperature. The properties required of this temperature indicator are that it reliably and clearly changes color at a specific temperature, and once the color changes, it does not return to its original color; it is a so-called irreversible temperature indicator, and it does not change color under conditions other than a specific temperature. It is necessary that there be. It has been reported that insects are killed at temperatures above 60°C, but in order to obtain a more complete insecticidal effect, it is preferable to heat the insecticide at a temperature of 80°C for 5 minutes or more. Temperatures of 80°C or higher are undesirable as they may have an adverse effect on sewing threads, etc.

Note that the temperature indicator may be one that utilizes a chemical reaction or color change due to melting point. When such a temperature indicator is coated on a base material such as a nonwoven fabric, when a certain temperature is reached, a chemical reaction occurs or the temperature indicator melts and is absorbed by the base material, causing the color of the base material to change. By visually observing this change, it is possible to confirm that the insects have been killed.

The insecticidal marking material 2 may be attached not only to the back side of the tatami floor but also to the front side. In addition, the insecticidal marking material 2 is not only used to obtain a confirmation effect, but also can be used as a strainer.

The insecticidal marking material 2 is provided on at least one of the front and back surfaces of the tatami floor 1, but it may be used only on a part of that surface. For example, a temperature indicator applied to the insecticidal marking material may , characters, figures, symbols, etc. may be applied so as to stand out.

Next, a specific example of a tatami mat equipped with the insecticidal marking material of the present invention will be described.

An insecticidal marking material coated with a temperature indicator that changes color from white to blue at 80°C (for example, Thermolabel, manufactured by Nihon Yu Giken Kogyo Co., Ltd.) is laid down on kraft paper, and the insecticidal marking material 2 is placed on top of the craft paper. Rice straw was stacked on top alternately vertically and horizontally so that each tatami weighed 15 kg/m ² and the area between the vertical and horizontal threads was 11 m ² using a tatami machine with polypropylene upper and lower threads. Sewn to obtain 50mm thick tatami floor 1. The tatami floor 1 thus formed is placed in a dielectric heating furnace, and the temperature inside the tatami floor is increased.
Heat treatment at 80°C for 5 minutes or more. Due to the heat treatment, the insecticidal indicator material 2 changed color from white to blue.

The tatami floor 1 is made into a tatami by further covering the surface with a tatami cover 3 and sewing hem cloth 5 to the edge.

In addition, it is perfect if the thread 7 for sewing the tatami facing 3 and hem cloth 5 and the thread 6 for sewing the tatami floor 1 are also treated with insecticidal or insect repellent treatment. In addition, the bottom paper (not shown) of the hem cloth 5 is also coated with or impregnated with a temperature indicator, and the bottom paper is formed to be slightly larger than the hem cloth 5, so that discoloration of the bottom paper is visible from the outside. If you keep this in mind, you can check the heat treatment in the next step.

(Effect of the invention) It is possible to easily know that the tatami mat has been heat-treated to kill insects from the discoloration of the insecticide marking material over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of a tatami mat equipped with an insecticidal marking material according to the present invention, and FIG. 1 is a schematic perspective view, and FIG. 2 is a partially enlarged sectional view. 1... Tatami floor, 2... Insecticidal marking material, 3... Tatami surface,
5... Hem cloth, 6,7... Thread.

Claims (1)

[Scope of utility model registration request] An insecticide indicator characterized in that an insecticide indicator material coated with or impregnated with a temperature indicator that irreversibly changes color at a specific temperature is provided on at least one of the front and back surfaces of a tatami floor made of rice straw. Tatami with wood.