JP2006273938A - Adhesive tape for sealing, sealing body, method for checking temperature variation of sealing body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to easily check whether a sealing body is subjected to temperature variations or not by applying a simple means to a sealing body such as a can or a box. <P>SOLUTION: An adhesive tape T for sealing comprising a supporting substrate 1 and an adhesive layer 2 comprises a heat sensitive part 3 in at least one part thereof, wherein the heat sensitive part 3 contains a heat sensitive material that changes color irreversibly with temperature variations. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sealing pressure-sensitive adhesive tape having a temperature-indicating material that changes irreversibly with temperature. The present invention also relates to a sealing body in which the sealing portion of the sealing body is sealed using the sealing adhesive tape. Moreover, this invention relates to the method of confirming whether the temperature change of the said sealing body was received by the presence or absence of discoloration of the temperature-indicating material which the adhesive tape for sealing has.

  Conventionally, a can body having a lid, a box body such as a cardboard box, a paper box or the like is used as an exterior package for storing contents such as various products. These cans, boxes, and the like often seal a sealing portion such as a lid after enclosing various products as contents. That is, a sealed body such as a can body or a box body is in a state in which the inclusion is sealed in the package by sealing the sealed portion. A sealing adhesive tape is used for sealing the sealing portion. (Patent Literature 1, Patent Literature 2, Patent Literature 3).

  Therefore, when the exterior package which is a sealing body is opaque, the inclusion cannot be confirmed from the outside. For this reason, even if the sealed body is exposed to a high temperature and heat is applied to the inclusion, and the inclusion has deteriorated, the state of the inclusion cannot be confirmed. In order to check the state of the inclusion, it is necessary to release the sealing of the sealing part and open the exterior packaging, but it is impossible to open the packaging before selling the product etc., so various products etc. are sold At this stage, it was impossible to confirm whether or not the inclusion was altered. For this reason, it is not possible to know whether the inclusions have deteriorated when selling various products, etc., or whether the deterioration has occurred because there was a problem with user management after sales, and there is a problem in product management. there were.

In order to solve this problem, a label that changes color due to a temperature change is attached to an exterior package such as a product. Such temperature discoloration labels are often affixed to the bottom surface of the can so as not to impair the appearance of the outer package. However, when the temperature discoloration label is affixed to the bottom surface, it is difficult to know where the temperature discoloration label is applied, and where the temperature discoloration label is affixed. In addition, since the temperature discoloration label is affixed to the exterior package via a baseless double-sided tape, etc., adhesive processing is required for application, and a process for applying the temperature discoloration label is required. There were problems in the pasting process such as Further, the temperature discoloration label is expensive in terms of cost, for example, a cover film is necessary to protect the discoloration portion.
JP 2002-317157 A JP 2003-20457 A JP 2003-105285 A

  It is an object of the present invention to make it easy to confirm whether or not a sealing body has undergone a temperature change by applying simple means to the sealing body such as a can or a box. It is what. Furthermore, it is an object to eliminate the need for a cover film or the like in order to protect the discolored portion.

  As a result of intensive studies to solve the above problems, the present inventors have found that the object can be achieved by the sealing method shown below, and have solved the present invention.

That is, the present invention is a pressure-sensitive adhesive tape for sealing having a support substrate and a pressure-sensitive adhesive layer,
The sealing pressure-sensitive adhesive tape relates to a sealing pressure-sensitive adhesive tape characterized by having a temperature-indicating part having a temperature-indicating material that changes irreversibly with a change in temperature.

  In this invention, it has a temperature-indicating part which has the temperature-indicating material which changes irreversibly by temperature change in a part of adhesive tape for sealing. Since the adhesive tape for sealing is affixed to the sealing part of a sealing body, when a sealing body is displayed, managed, etc., a temperature-indicating material can be confirmed in the position where it is easy to observe compared with a label etc. Therefore, for example, it can be easily confirmed whether or not the product related to the sealed body has been exposed to a high temperature before the sale. Moreover, the adhesive tape for sealing is conventionally used for the sealing body, and the adhesive process for affixing is not required like a label. In addition, the sealing adhesive tape of the present invention can use the same material related to the sealing adhesive tape as the conventional one except that the temperature-indicating material portion is used, so that it is inexpensive and simple. By this method, the temperature indicating part can be displayed on the sealed body.

  The sealing pressure-sensitive adhesive tape can be provided with a temperature-indicating part having a temperature-indicating material irreversibly discolored on the surface of the pressure-sensitive adhesive layer as a temperature-indicating layer.

  The sealing pressure-sensitive adhesive tape can be provided with a temperature-indicating part having a temperature-indicating material irreversibly discolored on the surface of the support base material adhesive layer as a temperature-indicating layer.

  The temperature-indicating part can be provided by laminating as a temperature-indicating layer on either side of the supporting substrate and the pressure-sensitive adhesive layer, and can be provided on both sides of the supporting substrate and the pressure-sensitive adhesive layer. The adhesive layer is preferably provided on the pressure-sensitive adhesive layer side. When providing a temperature-indicating layer in the form of a label or the like on the pressure-sensitive adhesive layer side, it can be easily laminated by attaching the temperature-indicating layer to the pressure-sensitive adhesive layer, and it is necessary to provide a separate layering step for the temperature-indicating layer. Absent. Further, when providing the temperature-indicating layer on the pressure-sensitive adhesive layer side, the temperature-indicating layer is sandwiched between the sealing body and the pressure-sensitive adhesive layer when the sealing pressure-sensitive adhesive tape is attached to the sealing body. There is no need to attach a cover film or the like to the layer, and the cost is low.

  The sealing pressure-sensitive adhesive tape may contain a temperature-indicating part having a temperature-indicating material that changes irreversibly in the pressure-sensitive adhesive layer.

  The sealing pressure-sensitive adhesive tape may contain a temperature indicating portion having a temperature indicating material that changes color irreversibly in the support substrate.

  The temperature indicating part can also be contained in the supporting substrate and / or the pressure-sensitive adhesive layer. When the temperature-indicating part is contained in the support substrate and the pressure-sensitive adhesive layer, it is not necessary to separately provide the temperature-indicating layer, and the sealing adhesive tape can be produced and pasted with good operation.

  In the sealing pressure-sensitive adhesive tape, the outermost end portion of the sealing pressure-sensitive adhesive tape is a hanging part for peeling off the pressure-sensitive adhesive tape, and the temperature-indicating part having a temperature-indicating material irreversibly discolored in the hanging part. It can be.

  By providing a hanging part for peeling off the adhesive tape at the end of the adhesive tape for sealing, and including a temperature indicating part in the hanging part, for example, the temperature indicating part is irreversible at the human body temperature. If a temperature-indicating material that changes color is used, whether or not a person has touched the hanging part depending on whether the temperature-indicating material has changed color, or whether or not tampering such as peeling off the sealing tape has been performed Or the like.

  Further, the present invention provides the sealing body, wherein the sealing adhesive tape is attached to the sealing portion of the sealing body that is sealed by sealing the sealing portion, and the sealing portion is sealed. , Regarding.

  The sealing body to which the sealing adhesive tape of the present invention is attached can easily perform quality control of the inclusions in the sealing body by confirming the presence or absence of discoloration of the temperature indicating material possessed by the sealing adhesive tape. it can. As a result, at the time of sale, it can be easily determined whether or not the inclusion has deteriorated to become a defective product, and since the sealed body has been sold, it is possible to prevent trouble related to the deterioration of the inclusion.

  Further, the present invention provides a sealing body in which the sealing body has a temperature change depending on the presence or absence of discoloration of the temperature indicating part of the sealing adhesive tape with respect to the sealing body in which the sealing adhesive tape is attached to the sealing section. It is related with the confirmation method of the temperature change of the sealing body characterized by confirming whether it received or not.

  The sealing body to which the pressure-sensitive adhesive tape for sealing of the present invention is attached can easily confirm whether or not the sealing body has undergone a temperature change or the like.

  The sealing adhesive tape of the present invention will be described below with reference to the drawings. The sealing tape T for sealing of the present invention has a support base 1 and an adhesive layer 2 as shown in FIGS. Moreover, the pressure-sensitive adhesive tape for sealing of the present invention has, in part, a temperature indicating portion 3 having a temperature indicating material that irreversibly discolors due to a temperature change. The sealing adhesive tape of the present invention can be used in the form of a sheet.

  FIG. 1 shows a case where the temperature indicating portion 3 is laminated as the temperature indicating layer 3 on the pressure-sensitive adhesive layer 2, and the temperature indicating layer 3 is directly laminated on the pressure-sensitive adhesive layer 2. FIG. 1A is a cross-sectional view of the sealing pressure-sensitive adhesive tape T, and FIG. 1B is a perspective view of the sealing pressure-sensitive adhesive tape T. FIG. 1C is a cross-sectional view of the sealing adhesive tape T attached to the sealing portion 41 of the sealing body 4.

  In the sealing adhesive tape T of FIG. 1, one temperature indicating portion 3 is described, but the temperature indicating portion 3 may have a plurality. The temperature-indicating part 3 may be at least one in the length to be attached to the sealing body in the sealing tape T for sealing. Moreover, in FIG.1 (b), although the temperature-indicating part 3 is illustrated circular, the shape of the temperature-indicating part 3 is not particularly limited, and can be various shapes. It can be a character, a symbol or the like. For example, a pattern corresponding to a pattern (for example, a character pattern) displayed on the exterior package of the sealing body 4 can be used as the shape of the temperature indicating portion 3. Moreover, in FIG.1 (b), although the temperature indicating part 3 is arrange | positioned in the approximate center of the width direction of the adhesive tape T for sealing, the position of the temperature indicating part 3 is not restrict | limited in particular. Moreover, the temperature-indicating part 3 can be provided in the full width direction of the sealing tape T for sealing. The sealing pressure-sensitive adhesive tape only needs to be provided at least in part, and the temperature indicating portion 3 may be entirely formed of a temperature indicating material, and a part thereof is formed of the temperature indicating material. May be. It should be noted that the number, shape, arrangement, etc. of the temperature indicating portion 3 are similarly applied to the sealing pressure-sensitive adhesive tape T of other modes such as FIGS.

  FIG. 2 shows a case where the temperature indicating portion 3 is included in the pressure-sensitive adhesive layer 2. 1 and 2, in order to ensure the adhesive performance as the sealing adhesive tape T, the area ratio of the temperature indicating portion 3 on the surface of the adhesive layer 2 (surface area of the temperature indicating layer 3 / adhesive layer). 2 as a whole surface) × 100 (%) is preferably 20 to 90%, more preferably 50 to 80%.

  FIG. 3 is a cross-sectional view of the pressure-sensitive adhesive tape T for sealing when the temperature indicating portion 3 is laminated on the support base material 1 as the temperature indicating layer 3. FIG. 4 is a cross-sectional view of the sealing tape T for sealing when the temperature indicating portion 3 is included in the support base material 1. 3 and 4, a cover film (not shown) can be provided on the surface in order to protect the temperature indicating portion 3.

  FIG. 5A is a cross-sectional view of the sealing adhesive tape T when a hooking portion K for peeling is provided at the end of the sealing adhesive tape, and the temperature indicating portion 3 is provided as the hooking portion K. It is. FIG. 5B is a perspective view thereof, and a hooking portion K is provided in the entire width direction of the sealing tape T for sealing. 5A and 5B show the case where the hanging portion K which is the temperature indicating portion 3 is provided in the form of FIG. 1, it can be provided in the form of FIGS. 2 to 4. Further, as shown in FIG. 5C, the hanging portion K having the temperature indicating portion 3 is sandwiched between the pressure-sensitive adhesive layers 2 of the sealing tape T for sealing, as shown in FIG. It can be formed by bending the outermost end of the sealing tape T for sealing so that the pressure-sensitive adhesive layer 2 is inside.

  FIG. 6 shows a case where the sealing part 41 is sealed by sticking the sealing adhesive tape T to the sealing part 41 of the sealing body 4. The sealing body 4 in FIG. 6 has a structure in which the upper body 4A serves as a lid with respect to the housing portion which is the lower body 4B. In the sealing section 41, the sealing body 4 is sealed and sealed. The sealing tape T for sealing has a hanging portion K. The temperature indicating portion 3 is provided on or in the surface of the hook portion K and the support base material 1 or the pressure-sensitive adhesive layer.

  The material of the support substrate 1 is not particularly limited, and various materials that can be used for the pressure-sensitive adhesive tape for sealing can be used. For example, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyolefins using one or more α-olefins such as ethylene, propylene and butene-1; the α-olefins and cyclic olefins, styrene and the like Copolymers with aromatic vinyl compounds; transparent plastics such as polyvinyl alcohol, polyvinylidene chloride, polyvinyl chloride, and ethylene-vinyl acetate copolymers. Moreover, natural paper, synthetic paper, recycled paper, kraft paper and other papers, woven fabrics, non-woven fabrics, etc., or plastic laminates thereof can be used.

  In addition, when providing the temperature-indicating layer 3 as an adhesive tape for sealing in the embodiment of FIG. 1 and FIG. 2, when the adhesive tape for sealing is affixed, the temperature-indicating layer 3 can be visually recognized. For 1, a transparent material is used. When the temperature indicating layer 3 is provided as the sealing adhesive tape in the embodiment of FIGS. 3 and 4, the temperature indicating layer 3 can be visually recognized even when the sealing adhesive tape is attached. A material other than a transparent material can be used, and a transparent plastic can be colored. A pigment or the like is appropriately used for coloring.

  The thickness of the support substrate 1 is not particularly limited, but is about 4 to 150 μm, preferably 25 to 150 μm, from the viewpoint of ease of peeling and workability. The tape width of the support substrate 1 can be appropriately determined according to the type of the sealing body, the shape of the sealing portion, and the like, but is usually 10 to 100 mm, preferably 15 to 50 mm.

  As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 2, various materials that can be used for the pressure-sensitive adhesive tape for sealing can be used. For example, various pressure-sensitive adhesives such as an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, and a silicone-based pressure-sensitive adhesive can be used without particular limitation. In addition to the base polymer, a tackifier, a crosslinking agent and the like are blended with the pressure-sensitive adhesive as necessary. The pressure-sensitive adhesive includes plasticizers, fillers, pigments, colorants, fillers, antioxidants, ultraviolet absorbers, silane coupling agents, and the like, and various additives without departing from the object of the present invention. Can also be used as appropriate. In addition, when providing the temperature-indicating layer 3 in the form of FIG. 1 and FIG. 2 as an adhesive tape for sealing similarly to the support base material 1, the adhesive layer 2 uses a transparent material.

  The pressure-sensitive adhesive layer 2 can be formed by forming it on one side of the support substrate 1. The method for forming the pressure-sensitive adhesive layer 2 is not particularly limited, and a method of directly applying and drying a solution or emulsion containing the pressure-sensitive adhesive on the support substrate 1 using a comma coater, top feed reverse coater, etc. After forming the pressure-sensitive adhesive layer 2 on the release film, a method of bonding them to the support substrate 1 can be employed. The thickness of the pressure-sensitive adhesive layer 2 can be appropriately determined according to the type of the sealing body, the shape of the sealing portion, and the like, but is usually about 10 to 200 μm, and more preferably 10 to 50 μm.

  The temperature indicating portion 3 that the pressure-sensitive adhesive tape T for sealing of the present invention has together with the support base 1 and the pressure-sensitive adhesive layer 2 has a temperature indicating material that irreversibly discolors due to a temperature change.

  The temperature indicating material takes into consideration the temperature that causes the quality change of the inclusion so that the quality of the inclusion can be controlled according to the type of inclusion contained in the sealing body to which the adhesive tape for sealing is applied. Select and use. As long as the temperature indicating material is irreversibly discolored due to a temperature change, the temperature indicating material may be discolored with an increase in temperature or may be discolored with a decrease in temperature. For example, as the inclusion, a material that is irreversibly discolored at 30 ° C. is used when it is likely to be altered, deformed, etc. at a temperature of 30 ° C. or higher, and the commercial value may be impaired, such as chocolate. It is done. If the temperature indicating material changes color due to temperature change, the color before and after the color change is not questioned, but considering the color of the exterior of the sealing body to which the sealing adhesive tape is applied, the temperature has exceeded the predetermined temperature. It is preferable to select a color that can be recognized. For example, a mode is selected in which the color of the temperature indicating portion 3 after being changed to a predetermined temperature or more and the color of the exterior of the sealing body 4 are the same, and the visibility of the temperature indicating portion 3 is not impaired. Is preferred. The temperature indicating material may be transparent before the color change and colored after the color change, or vice versa.

  As the temperature indicating material, for example, a composition that changes color by heating, for example, a composition containing a bismuth compound, at least one of a metal compound containing water and a metal complex compound containing water, and a thiourea compound Can be given. In such a composition, it is preferable that the bismuth compound is 7 to 30 parts by weight, at least one of the metal compound containing water and the metal complex compound containing water is 7 to 30 parts by weight, and the thiourea compound is 3 to 10 parts by weight. .

  Examples of the bismuth compound include 3,2-bismuth oxide, bismuth nitrate hydroxide, bismuth hydroxide, basic bismuth acetate, basic bismuth carbonate, bismuth oxalate, bismuth sulfate, and bismuth chloride. These compounds are used alone or in combination of two or more.

  Metal compounds containing water as a compound and metal complex compounds containing water as a compound include cobalt nitrate hexahydrate, nickel nitrate hexahydrate, aluminum nitrate nonahydrate, chromium nitrate nonahydrate, iron nitrate 9 hydrate, decahydrate or complex of cobalt nitrate and hexamethylenetetramine, decahydrate of cobalt nitrate, nickel nitrate and hexamethylenetetramine, complex of cobalt oxide and hexamethylenetetramine 9 hydrate of cobalt, hexadecahydrate of cobalt chloride and hexamethylenetetramine, cobalt bromide hexahydrate, cobalt acetate tetrahydrate, cobalt chloride hexahydrate, cobalt oxalate dihydrate , Cobalt ammonium chloride hexahydrate, cobalt ammonium sulfate hexahydrate, and ammonium chromium sulfate dodecahydrate. These compounds are used alone or in combination of two or more.

  Examples of thiourea compounds include thiourea, 1,3-dimethyl-2-thiourea, 1,3-diethyl-2-thiourea, 1,3-ditolylthiourea, 2,2-ditolylthiourea, and 1,3-diphenyl. 2-thiourea, 1-phenyl-2-thiourea, allylthiourea, ethylenethiourea, trimethylthiourea, tolylthiourea, methylthiourea, ethylthiourea, 1-phenyl-3-thiosemicarbazide, 4-phenyl-3-thio Semicarbazide and thiocarbohydrazide. These compounds are used alone or in combination of two or more.

  The heating discoloration composition can be arbitrarily prepared by variously changing the composition ratio and type of each compound constituting the heating discoloration composition within the above range. In addition to the above compounds, other additives such as Carplex (trade name, manufactured by Shionogi & Co., Ltd.), talc, and magnesium carbonate may be added to the heat-discoloring composition.

  In addition, as the temperature indicating material, a combination of an organic amine and an acid-base color-changing dye can be used. In addition, it is possible to use those in which the microcapsules are broken and discolored at an arbitrary temperature.

  In addition, as a material which changes irreversibly at 30 ° C., for example, a material which breaks microcapsules at 30 ° C. and changes its reaction color is used.

  The temperature indicating portion 3 of the sealing adhesive tape T is formed by the temperature indicating material. As shown in FIG. 1 or FIG. 3, when the temperature indicating portion 3 is provided as a temperature indicating layer on the surface of the support substrate 1 or the pressure-sensitive adhesive layer 2, the formation of the temperature indicating portion 3 is, for example, The temperature-indicating material can be obtained by an ink composition mixed with a binder such as a synthetic resin dissolved in a solvent. Examples of synthetic resin binders include acrylic, polyamide, vinyl, cellulose, and rubber binders.

  The ink composition can be formed by coating directly on the surface of the support substrate 1 or the pressure-sensitive adhesive layer 2. Moreover, as shown in FIG. 7, the temperature-indicating part 3 can be applied as a label form. The temperature indicating part 3 shown in FIG. 7 is attached to the surface of the pressure-sensitive adhesive layer 2 as a label in which the temperature indicating layer 32 is provided on the base material 31. As the base material 31, the same material as the support base material 1 can be illustrated. In any case, the thickness of the temperature indicating layer is usually preferably about 1 to 10 μm. As a method for forming the temperature indicating layer, conventionally employed means such as gravure printing, flexographic printing, and offset printing can be used without any particular limitation. In addition, when sticking the temperature-indicating part 3 (the label in which the temperature-indicating layer 32 is provided on the base material 31) illustrated in FIG. It is pasted.

  As shown in FIG. 2 or FIG. 4, when the temperature indicating portion 3 is provided inside the support substrate 1 or the pressure-sensitive adhesive layer 2, the temperature indicating portion 3 is formed by the temperature indicating material or the ink. It is performed by impregnating the support substrate 1 or the pressure-sensitive adhesive layer 2 with the composition. 2 or 4, the temperature indicating portion 3 is formed on a part of the support base material 1 or the pressure-sensitive adhesive layer 2. However, in the embodiment of FIG. 2 or FIG. 4, the temperature indicating portion 3 is the support base material. 1 or the entire pressure-sensitive adhesive layer 2 can be impregnated.

  The sealing pressure-sensitive adhesive tape of the present invention is used for sealing a sealing body that is sealed by sealing a sealing portion. Examples of the sealing body include a can body having a lid, a box body such as a cardboard box and a paper box.

It is an example of sectional drawing of the adhesive tape for sealing of this invention. It is an example of the perspective view of the adhesive tape for sealing of this invention. It is an example of sectional drawing of the state which affixed the adhesive tape for sealing of this invention on the sealing body. It is an example of sectional drawing of the adhesive tape for sealing of this invention. It is an example of sectional drawing of the adhesive tape for sealing of this invention. It is an example of sectional drawing of the adhesive tape for sealing of this invention. It is an example of sectional drawing at the time of providing a hanging part in the adhesive tape for sealing of the present invention. It is an example of sectional drawing at the time of providing a hanging part in the adhesive tape for sealing of the present invention. It is an example of sectional drawing at the time of providing a hanging part in the adhesive tape for sealing of the present invention. It is an example of the conceptual diagram of the state which affixed the adhesive tape for sealing of this invention on the sealing body. It is an example of sectional drawing of the adhesive tape for sealing of this invention.

Explanation of symbols

1: Support base material 2: Adhesive layer 3: Temperature indicating part 4: Sealing body 41: Sealing part T: Adhesive tape for sealing K: Hanging part

Claims (8)

A sealing adhesive tape having a support substrate and an adhesive layer,
The sealing pressure-sensitive adhesive tape is characterized by having a temperature-indicating part having a temperature-indicating material irreversibly discolored by a temperature change at least in part.   The pressure-sensitive adhesive tape for sealing according to claim 1, wherein a temperature-indicating part having a temperature-indicating material that changes color irreversibly is provided as a temperature-indicating layer on the surface of the adhesive layer.   The pressure-sensitive adhesive tape for sealing according to claim 1 or 2, wherein the temperature-indicating portion having a temperature-indicating material that changes color irreversibly is provided as a temperature-indicating layer on the surface of the support substrate.   The pressure-sensitive adhesive tape for sealing according to any one of claims 1 to 3, wherein a temperature-indicating portion having a temperature-indicating material that changes color irreversibly is contained in the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive tape for sealing according to any one of claims 1 to 4, wherein a temperature-indicating part having a temperature-indicating material that changes color irreversibly is contained in a supporting substrate.   The endmost part of the adhesive tape for sealing is a hanging part for peeling off the adhesive tape, and the hanging part has a temperature indicating part having a temperature indicating material that changes irreversibly. The adhesive tape for sealing in any one of Claims 1-5.   The sealing adhesive tape according to any one of claims 1 to 6 is affixed to the sealing part of the sealing body sealed by sealing the sealing part, and the sealing part is sealed. Characteristic sealed body.   Whether the sealing body has undergone a temperature change due to the presence or absence of discoloration of the temperature indicating portion of the sealing adhesive tape with respect to the sealing body in which the sealing adhesive tape is attached to the sealing portion according to claim 7. A method for confirming a temperature change of a sealed body, characterized by confirming whether or not.

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