JP2013137212A - Temperature-indicating label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature-indicating label that can be used outdoors, is not broken even when heated to a certain temperature or higher or when stress is applied to a transparent film by rubbing from outside, and exhibits excellent performance as a temperature-indicating material.SOLUTION: There is provided the temperature-indicating label that includes a support and a temperature-indicating member previously set on the support and coloring at an arbitrary temperature, and is provided with the transparent film thereupon. An outer peripheral part ot the temperature-indicating label where the support and the transparent film come into contact with each other is fused.

Description

  The present invention relates to a temperature indicating label. More specifically, the present invention relates to a temperature indication label that is affixed to products and devices that require temperature management and is used for temperature management such as measurement of temperature history and accumulated heating amount, and confirmation of temperature.

  Conventionally, in order to measure the temperature history and accumulated heating amount, and to check the temperature, a temperature indicating member is provided on a part of the support such as a film via an adhesive layer, and a surface film is laminated thereon. A temperature indicating label of the configuration is known (see, for example, Patent Document 1). These labels are used in various industrial fields that require temperature control because they are inexpensive and have high detection accuracy, are less likely to malfunction, and do not require additional equipment such as a power source.

  For example, in products and equipment that require temperature management, those that require heating above a preset temperature, or that are heated above a certain temperature may cause inconvenience such as deterioration or malfunction. There is something that happens. In order to perform these temperature controls, the temperature label is actually used.

  However, as described above, since the temperature indicating member is provided on a part of the support via the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer, the temperature indicating member, and the surface film are formed on the support depending on the type and configuration of the material used. In some cases, bubbles may enter the boundary between the portion composed of the three layers and the portion composed of the two layers of the pressure-sensitive adhesive layer and the surface film.

    In the conventional temperature label, since the support and the surface film are bonded together via the adhesive layer, when the temperature label is heated, the bubbles expand due to heat, and the surface film and the adhesive layer are peeled off. In particular, when used in a liquid such as water or oil, or when used outdoors, the liquid enters from the peeled part, dissolves and alters the temperature indicating member, etc. The function could not be performed, and as a result, it could not be used as a temperature indicating label.

  For this reason, in order to eliminate the level difference between the pressure-sensitive adhesive layer and the temperature indicating member, and to suppress the entry of bubbles into the temperature indicating label, an insole sheet having a thickness similar to that of the temperature indicating member is provided on the pressure-sensitive adhesive layer. It is done to prevent entry. (See Patent Document 2).

  However, it is necessary to dispose the temperature indicating member and the insole sheet on the pressure-sensitive adhesive layer so that air bubbles are not involved, and there are problems such as a complicated manufacturing process and layer structure.

JP 2001-83020 A JP 2003-172661 A

  The present invention can be used outdoors, and even when stress is applied to the transparent film, such as when the temperature label is heated above a certain temperature without being complicated, or when it is subjected to external abrasion, The present invention provides a temperature indicating label that does not break the label and can exhibit good performance as a temperature indicating material.

In the present invention, the above-mentioned problems are solved by welding the outer peripheral portion where the support and the transparent film are in contact, and the present invention has been completed.
That is, the present invention
“1. In a temperature indication label in which a support and a temperature indicating member that develops color at an arbitrary temperature set in advance on the support are provided via an adhesive layer, and a transparent film is provided thereon, the support and the A temperature indicating label characterized by welding an outer peripheral portion in contact with a transparent film.
2. 2. The temperature indicating label according to claim 1, wherein the temperature indicating member is disposed on a support via an adhesive layer. ".

  According to the present invention, since the outer periphery where the support constituting the temperature indicating label and the transparent film are in contact with each other is welded, the temperature indicating temperature is displayed even when the temperature indicating label is heated or when the transparent film is subjected to stress such as abrasion from the outside. Since the label is not destroyed, it has an excellent effect such that it can be used stably.

It is sectional drawing which showed typically an example of the temperature indication label of this invention. It is sectional drawing which showed typically the other example of the temperature indication label of this invention. It is sectional drawing which showed typically an example of the conventional temperature indication label.

  An example of the temperature indicating label of the present invention will be described with reference to FIG. As a configuration of the temperature label (1) of the present invention, a temperature indicating member (4) is provided on a support (2) via an adhesive layer (3), and a transparent film (5) is further provided thereon. It has become. Moreover, the part which the said support body (2) and a transparent film (5) contact has the structure which became the weld part (6) welded.

  By adopting the above-described configuration, even when the bubbles expand when the temperature indicating label is heated, even when stress is applied to the transparent film such as external scratching, the support and the transparent film are not peeled off, It can be used as a temperature indicating label.

  In this invention, strength is obtained by welding a support body and a transparent film rather than the case where the support body and transparent film which are the structures of the conventional temperature-indicating label are bonded together with an adhesive. Therefore, even when the temperature indicating label is heated and the bubbles expand, or when the transparent film is subjected to stress such as external scratching, the transparent film is not peeled off and the structure is not destroyed. It has a function.

  The transparent film used in the present invention is not particularly limited as long as it can recognize that the temperature indicating member is colored, decolored or discolored and can be welded to the support. Specifically, a polyolefin resin, a polyester resin, a polystyrene resin, an acrylic resin, a polyamide resin, a fluorine resin, a mixture of these resins, or a film made of a laminate can be used.

  The transparency of the transparent film used in the present invention means that it is colorless or colored and has a light transmittance that can recognize changes such as coloration, decoloration, or discoloration of the temperature indicating member.

  The support used in the present invention is not particularly limited as long as it can be welded to a transparent film, for example, paper such as fine paper, kraft paper, coated paper, art paper, polyolefin resin, polyester resin, polystyrene resin, acrylic resin, and the like. Examples thereof include a resin, a polyamide resin, a fluorine resin, a mixture of these resins, or a film made of a laminate.

  The temperature indicating member used in the present invention has a structure in which waxes or organic compounds that melt at a preset temperature are laminated in a coarse state on a colored substrate such as colored paper (hereinafter referred to as a wax type temperature indicating member). Can be used).

  Until the temperature reaches the preset temperature, the wax-type temperature indicating member scatters light and becomes opaque, thus hiding the color of the colored substrate. The waxes and organic compounds laminated in the coarse-grained state melt and penetrate into the colored base material, making it possible to see the colored base material that has been concealed up until now, and to develop a mechanism of coloring. Have.

  In the wax type temperature indicating member, as a method of laminating coarse particles of wax or organic compound on a colored substrate, the wax or organic compound is coarsely dispersed by dispersing the wax or organic compound in an organic solvent using a ball mill or the like. Waxes and organic compounds in a state can be obtained. By coating the coarse waxes or organic compounds on the colored base and drying, the coarse waxes or organic compounds can be laminated on the colored substrate.

  The set temperature at which the wax-type temperature indicating member is colored is determined by the melting point of the wax or organic compound. Accordingly, in order to set the desired temperature, waxes and organic compounds may be appropriately selected. Examples of the waxes used in the present invention include natural waxes and synthetic waxes. , Microcrystalline wax, polyethylene wax, and the like are used. Examples of the organic compound include long chain fatty acids and esters thereof, amides, and the like. For example, trilaurin, myristic acid, behenic acid, stearic acid amide and the like are used.

  The thickness of the temperature indicating member used in the present invention is preferably about 50 to 200 μm. If it is in this range, the sensitivity of the temperature indicating member is good and easy to recognize, which is preferable. If it is thicker than this range, the transmission of heat from products and devices with temperature indicating labels that require temperature control will be delayed, and actual temperature history may not be shown.

  In addition, when the temperature indicating member is thinner than this range, when a wax type temperature indicating member is used, it tends to be difficult to recognize a coloring state due to a temperature change of the temperature indicating member. From the above, it is preferable to be in the above range.

  In addition to the wax-type temperature indicating member, an electron-donating coloring compound and an electron-accepting compound dispersed in a resin or encapsulated in microcapsules are laminated on a substrate such as paper or film. The thing of the structure (chemical reaction type temperature indicating member) can also be used. When the temperature indicating member of this configuration reaches a preset temperature, it can be confirmed that the preset temperature has been reached by changing to a decolored state or a discolored state in addition to a change to a colored state due to a chemical reaction. it can.

  As the temperature indicating member used in the present invention, the wax type temperature indicating member and the chemical reaction type temperature indicating member can be used in combination.

  When the temperature indicating member of the present invention is disposed on the support, the temperature indicating label is preferably disposed via an adhesive. By using the pressure-sensitive adhesive layer, the temperature information of the products and devices to which the temperature label is attached can be obtained without deviating from the support when the temperature label is used in any orientation. The pressure-sensitive adhesive layer can be formed by disposing a pressure-sensitive adhesive on the base material of the temperature indicating member by coating, printing, or the like. The pressure-sensitive adhesive to be used is not particularly limited as long as the temperature indicating member can be fixed, and examples thereof include an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a polyurethane pressure-sensitive adhesive, and an epoxy resin. Among these, an acrylic pressure-sensitive adhesive is preferable because it has good weather resistance and hardly deteriorates the material.

  The thickness of the pressure-sensitive adhesive layer is preferably about 10 to 100 μm. Within this range, it is preferable to transmit the heat to the temperature indicating member from a device or the like to which the temperature indicating label is attached without dropping the heat, and the performance of the temperature indicating label can be sufficiently exhibited.

  As an example of the method for producing a temperature indicating label of the present invention, an adhesive is provided on the substrate side of the temperature indicating member by coating, printing, or the like, and disposed on the support (2). The temperature indicating member (4) can be formed in an arbitrary shape such as a circular shape or a polygonal shape. After laminating a transparent film on the support and the temperature indicating member, a temperature indicating label is formed by welding an outer peripheral portion where the support and the transparent film are in contact by using a welding method such as an impulse method or an ultrasonic method.

  In addition, the support and the transparent film used for the temperature indicating label of the present invention may be a single film. That is, the temperature indicating member (14) is disposed via the adhesive (13) on the left or right half of the transparent film used as a support having the same width as the temperature indicating label and twice the length. After that, the other half where the temperature indicating member (14) is not disposed is folded back and provided as a transparent film (15) on the support (12) and the temperature indicating member, and then the outer periphery other than the folded portion (12a). The temperature indicating label (11) having the configuration shown in FIG. 2 can be obtained by welding the portions.

    The temperature label of the present invention is often used by being attached to products or devices that require temperature management in order to perform temperature management. On the back surface of the temperature label support, an adhesive, a magnet, etc. The magnetic material or the like can be provided and attached to the products or devices.

Examples of the present invention will be described below, but the present invention is not limited thereto.
Example 1
(Production of temperature indicating member)
Polyethylene wax (melting point: 100 ° C.) 40 parts by mass Methyl ethyl ketone 60 parts by mass The above components were stirred and mixed in a ball mill for 1 hour to obtain a wax coating liquid in a coarse state.
Next, φ5 mm red colored paper is disposed as a substrate, and the colored surface is disposed on the surface side. On the colored surface of the colored paper, the wax coating solution is applied and dried at room temperature, so that the colored surface is concealed in white by a coarse-grained wax, and a temperature indicating layer composed of a base material and a wax layer. A member was obtained. The thickness of the obtained temperature indicating member was 125 μm.
(Manufacture of temperature label)
An acrylic adhesive was provided with a thickness of 25 μm on the side of the temperature indicating member where the wax layer was not provided to form an adhesive layer. The temperature indicating member provided with the pressure-sensitive adhesive layer is used as a support, a position of 7.5 mm in the width direction and 7.5 mm in the length direction of a transparent 50 μm polyethylene terephthalate film (hereinafter referred to as PET film) having a width of 15 mm × length of 30 mm. It was arranged so that the center would come. The transparent PET film was folded at a length direction of 15 mm, and the transparent film was provided so that the folded portion was on the support and the temperature indicating label. At this time, the three sides on the support side and the three sides on the transparent film side were overlapped. The outer periphery of the portion where the support and the transparent film other than the folded portion overlapped was welded by heating with a heat sealer (NL-331JC, manufactured by Ishizaki Electric Manufacturing Co., Ltd., heating temperature 190 ° C.) to obtain a temperature indicating label.

Example 2
(Production of temperature indicating member)
Fatty acid amide (melting point: 145 ° C.) 40 parts by mass Methyl ethyl ketone 60 parts by mass The above components were stirred and mixed in a ball mill for 1 hour to obtain a coarse-grain wax coating solution.
Next, φ5 mm red colored paper is disposed as a substrate, and the colored surface is disposed on the surface side. On the colored surface of the colored paper, the wax coating solution is applied and dried at room temperature, so that the colored surface is concealed in white by a coarse-grained wax, and a temperature indicating layer composed of a base material and a wax layer. A member was obtained. The thickness of the obtained temperature indicating member was 150 μm.
(Manufacture of temperature label)
An acrylic adhesive was provided with a thickness of 25 μm on the side of the temperature indicating member where the wax layer was not provided to form an adhesive layer. The temperature indicating member provided with the pressure-sensitive adhesive layer was disposed at a substantially central portion of a transparent 12 μm PET film having a width of 15 mm × 15 mm square as a support. Next, a transparent PET film of 50 μm is provided on the support and the temperature indicating member, and the outer periphery of the portion where the support and the transparent film overlap is heated with a heat sealer (NL-331JC, manufactured by Ishizaki Electric Manufacturing Co., Ltd., heating temperature 190 ° C.). It was welded by heating to obtain a temperature indicating label.

Comparative Example 1
(Production of temperature indicating member)
A temperature indicating member was obtained in the same manner as in Example 1.
(Manufacture of temperature label)
A 15 mm × 15 mm square 12 μm PET film was used as a support, and an acrylic pressure-sensitive adhesive was provided with a thickness of 25 μm to form a pressure-sensitive adhesive layer. The temperature indicating member is disposed almost at the center of the pressure-sensitive adhesive layer, and a transparent 50 μm PET film is laminated on the pressure-sensitive adhesive layer and the temperature indicating member using a laminator to provide a transparent film. Got a label.

加温試験：得られたラベルを塗装鉄板に粘着剤層に用いた粘着剤を用いて貼付し、１３０℃のオイルバスに３分間浸漬し、示温ラベルの状態を確認した。
○：示温ラベルとしての機能を有しており、構造に変化は見られない。
△：示温ラベルとしての機能を有しているが、気泡の膨張による透明フィルムの一部剥
がれが見られる。
×：気泡の膨張により、透明フィルムが剥がれオイルが浸入し、示温ラベルとしての機
能を有していない
擦過試験：得られたラベルを塗装鉄板に粘着剤層に用いた粘着剤を用いて添付し、学振式摩擦試験機（荷重５００ｇ 綿布擦過）にて１０００回擦過し、示温ラベルの状態を確認した。
○：透明フィルムの剥がれが見られない。
△：透明フィルム端部に剥れが見られる。
×：透明フィルムが完全に剥れてしまう。
The temperature indicating labels obtained in Examples 1 and 2 and Comparative Example 1 were evaluated in the following manner. The results are shown in (Table 1).

Heating test: The obtained label was affixed to a coated iron plate using the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer and immersed in an oil bath at 130 ° C. for 3 minutes to confirm the state of the temperature indicating label.
○: It has a function as a temperature indicating label, and no change is seen in the structure.
Δ: Although it has a function as a temperature indicating label, a part of the transparent film is peeled off due to expansion of bubbles.
×: Transparent film peels off due to expansion of air bubbles, and oil penetrates, and does not have a function as a temperature indicating label Friction test: The obtained label is attached to a coated iron plate with the adhesive used for the adhesive layer Then, it was rubbed 1000 times with a Gakushin friction tester (load 500 g cotton cloth rubbed) to check the state of the temperature indicating label.
○: No peeling of the transparent film is observed.
Δ: Peeling is observed at the end of the transparent film.
X: The transparent film is completely peeled off.

  As is apparent from the results of (Table 1), the temperature indicating labels of Examples 1 and 2 did not peel off the transparent film, and there was no change in the label structure in the heating test and the abrasion test. The performance was sufficiently satisfied.

  On the other hand, in the temperature label of Comparative Example 1, in the heating test, the transparent film was peeled off and the temperature label was broken.

  As described above, the temperature label of Comparative Example 1 did not have performance as a temperature label.

  The temperature indicating label of the present invention can be used in various fields requiring temperature management because it can be affixed to products and devices that require temperature management and temperature history and temperature can be confirmed.

DESCRIPTION OF SYMBOLS 1 ... Indication label 2 ... Support body 3 ... Adhesive layer 4 ... Indication member 5 ... Transparent film 6 ... Welding part 11 ... Indication label 12 ... Support body 12a ... Folding part 13 ... Adhesive layer 14 ... Indication member 15 ... Transparent film DESCRIPTION OF SYMBOLS 16 ... Welding part 21 ... Temperature indication label 22 ... Support body 23 ... Adhesive layer 24 ... Temperature indication member 25 ... Transparent film

Claims (2)

  An outer peripheral portion where the support and the transparent film are in contact with each other in a temperature indicating label in which a support and a temperature indicating member that develops color at an arbitrary temperature set in advance are provided on the support and a transparent film is provided thereon. A temperature indicating label characterized by welding.   The temperature indicating label according to claim 1, wherein the temperature indicating member is disposed on a support via an adhesive layer.

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