JP2010145845A - Thermosensitive recording label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermosensitive recording label capable of surely preventing blocking when the adhesiveness is developed in a delayed-tack pressure-sensitive adhesive layer. <P>SOLUTION: The thermosensitive recording label 1 comprises a thermosensitive recording layer 3 provided on one surface of a sheet 2 and a delayed-tack pressure-sensitive adhesive layer 4 provided on the other surface, wherein release varnish layers 20, 20a, 21 comprising a UV ray curable medium varnish having a thickness of 0.5 to 2.5 μm are provided on the surfaces of the thermosensitive recording layer 3 and the delayed-tack pressure-sensitive adhesive layer 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thermal recording label, and more particularly to a thermal recording label provided with a delayed tack type adhesive layer.

  Conventionally, there is known a thermal recording label in which a thermal recording layer is provided on one side of the paper and a delayed tack type adhesive layer is provided on the other side, and the thermal recording label of this configuration has the advantage that no release paper is required. (Patent Document 1).

Japanese Utility Model Publication No. 5-11573

  By the way, the above-mentioned heat-sensitive recording label is generally stored in a continuous state in which a plurality of labels are connected in a continuous state and wound in a roll shape in order to cope with information output devices and the like. It is. For this reason, the delayed tack-type pressure-sensitive adhesive layer and the heat-sensitive recording layer are brought into contact with each other. And it is usually a delayed tack type adhesive that does not have stickiness, but especially in the storage situation in the summer, when it is placed under high temperature, even if it does not lead to activation, it will exhibit stickiness and blocking. There was an inconvenience that it occurred.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a thermal recording label capable of reliably preventing blocking.

  In order to achieve this object, a thermal recording label according to claim 1 of the present invention is a thermal recording label in which a thermal recording layer is provided on one side of a sheet and a delayed tack type adhesive layer is provided on the other side. A release varnish layer having a thickness of 0.5 to 2.5 μm is provided on at least one surface of the thermosensitive recording layer or the delayed tack type adhesive layer. The release varnish layer may be provided by printing. However, if the thickness is less than 0.5 μm, the surface of the heat-sensitive recording layer or the delayed tack-type pressure-sensitive adhesive layer is exposed due to uneven printing or the like. A part is made. On the other hand, if the thickness exceeds 2.5 μm, it becomes difficult for heat from the head of the thermal printer to reach the thermosensitive recording layer, resulting in poor color development and clear printing. Also, on the surface of the delayed tack type adhesive layer, if the thickness exceeds 2.5 μm, a level difference is generated and the smoothness of the surface is impaired, and the transfer operation in the thermal printer or the activation using the thermal printer is performed. This adversely affects the heating operation.

  Similarly, in order to achieve the above-mentioned object, the thermal recording label according to claim 2 of the present invention is based on the above configuration, and the release varnish layer is made of a transparent ultraviolet curable medium varnish, and is formed only on the surface of the thermal recording layer. This is characterized by being provided so as to cover the entire surface.

  Similarly, in order to achieve the above-mentioned object, the thermal recording label according to claim 3 of the present invention is based on the configuration of the invention of claim 1 above, the release varnish layer is made of an ultraviolet curable medium varnish, and a delayed tack type adhesive. The layer is provided so as to cover a portion where activation of the layer is unnecessary.

  According to the heat-sensitive recording label of the present invention, there is an effect that blocking can be prevented by the release varnish layer that contacts the delayed tack pressure-sensitive adhesive layer during storage.

  Hereinafter, a preferred embodiment when the present invention is applied to a delivery slip will be described with reference to the accompanying drawings. Here, FIG. 1 is a plan view of the delivery slip, and FIG. 2 is a schematic cross-sectional view taken along line AA of FIG.

  As shown in FIGS. 1 and 2, the label-like delivery slip 1 is provided with a thermal recording layer 3 on one side of the slip sheet 2 and a delayed tack type adhesive layer 4 on the other side. The sections 5 and 6 are divided into a title section 7, a delivery / reception slip 8, and a pasting slip 9. Further, a peeling varnish layer 20 is provided on the back surface of the delivery / receipt slip 8 so as to cover the delayed tack type adhesive layer 4. On the other hand, a release varnish layer 21 is provided on the surface of the heat-sensitive recording layer 3 except for a portion corresponding to a receiving seal stamping column 14 to be described later in order to ensure the sealability. Then, on the surface of the delayed tack-type pressure-sensitive adhesive layer 4, an extended portion corresponding to the receipt stamping column 14 of the title portion 7 and the sticker 9 is provided on the surface of the release varnish layer 20. A release varnish layer 20a having the same thickness as that of the release varnish layer 20 is provided so as to extend perpendicularly to the strips 5 and 6.

  Here, the thickness of the thermal slip sheet 2 of the delivery slip 1 and the thermal recording layer 3 is 80 to 100 μm, the dry thickness of the delayed tack type adhesive layer 4 is 10 to 30 μm, the release varnish layers 20 and 20a, The thickness of 21 is preferably 0.5 to 2.5 μm. In this case, the thickness of the entire delivery slip 1 is 91 to 135 μm, but may be in the range of 90 to 140 μm. The reason for the thickness of the release varnish layers 20, 20 a, 21 has been described above, but the thickness relating to the other delivery slip 1 is based on the following knowledge obtained as a result of repeated experiments by the inventors. Is based. That is, if the total thickness of the heat-sensitive recording layer 3 and the slip sheet 2 is less than 80 μm, the heat-sensitive recording layer 3 may be colored by heat when the delayed tack type adhesive layer 4 is activated. As a result, curling due to heat increases and paper jams are likely to occur in the thermal printer. In addition, if the dry tack type pressure-sensitive adhesive layer 4 has a dry thickness of less than 10 μm, the required adhesiveness cannot be obtained. On the other hand, if the thickness exceeds 30 μm, the heat during activation hardly reaches the deep part. Since there are cases where the tackiness of is not activated, coating exceeding 30 μm is meaningless. Furthermore, if the thickness of the entire delivery slip 1 is larger than 140 μm, the thickness becomes the same as that of the thermosensitive recording label having the release paper covering the adhesive, and the continuous delivery slip 1 is wound into a roll. When it is made into a product, the number of paper turns is reduced, and the advantage of reducing the paper weight due to the absence of release paper is lost.

  As shown in FIG. 1, a title 11 called “delivery slip” is printed on the heat-sensitive recording layer surface of the title section 7. On the surface of the heat-sensitive recording layer 3 of the delivery slip / receipt slip 8, a delivery information entry field 12 for printing the delivery address and the requester and an inquiry number entry field 13 for printing an inquiry number such as a slip number are printed and a receipt stamp is printed. A seal column 14 is printed. Further, on the surface of the thermosensitive recording layer 3 of the delivery slip / receipt slip 8, a triangle peeling start end display 15 at the left corner on the cutting perforation 6 side, an arrow directed to the peeling start end display 15, and “from here The peeling start end instruction display 16 consisting of the sentence “Please peel off” is printed. Further, on the surface of the heat-sensitive recording layer 3 of the sticker slip 9, a delivery information entry field 17 for printing a delivery address, a requester, a product name, and a store and an inquiry number entry field 18 for printing an inquiry number such as a slip number are printed. Yes.

  The leuco dyes used in the above-mentioned heat-sensitive recording layer 3 are applied singly or as a mixture of two or more, but may be selected from those conventionally applied to this kind of heat-sensitive material. For example, a leuco compound of a dye such as triphenylmethane, fluorane, phenothiazine, auramine, spiropyran, or indinophthalide is suitable. Specific examples include 3,3-bis (p-dimethylaminophenyl) -phthalide, 3-cyclohexylamino-6-chlorofluorane, and 6-chloro-8-methoxy-benzoindolino-spiropyran. As the developer used in the heat-sensitive recording layer 3, various electron-accepting compounds or oxidizing agents that cause the leuco dye to develop a color upon contact are applied, and this type of developer is also publicly known. is there. Specifically, 4,4'-isopropylidenediphenol, 4,4'-isopropylidenebis (o-methylphenol), zinc p-nitrobenzoate and the like can be mentioned.

  Moreover, the above-mentioned delayed tack type adhesive does not have adhesiveness in a normal state, and has adhesiveness for a certain period after overheating by applying heat, and is conventionally known. Specifically, it consists of a heat-adhesive resin agent, a tackifier, and a plasticizer, and additives such as wax, antioxidant, desiccant and lubricant are added as necessary. Examples of the heat-adhesive resin agent include ethylene-ethyl acrylic acid copolymer, ethylene-methyl methacrylic acid copolymer, polyvinyl acetate, vinyl acetate-ethylene copolymer, polybutyl methacrylate, vinyl chloride-vinylidene chloride. Copolymer, vinyl acetate-2-ethylhexyl allylate copolymer, vinylpyrrolidone-styrene copolymer, vinylpyrrolidone-ethyl acrylate copolymer, styrene-butadiene copolymer, polyamide resin, polystyrene resin, polyurea resin, etc. Can be mentioned. Examples of the tackifier include glycerin ester of rosin, pentaerythritol-modified rosin, petroleum resin, indene resin, ethyl cellulose, α-methylstyrene-vinyltoluene copolymer, temper oil polymer, temperphenol polymer, and the like. be able to. Furthermore, examples of the plasticizer include dihydroabiethyl phthalate, dihexyl phthalate, diphenyl phthalate, dimethyl isophthalate, ethylene glycol tribenzoate, trimethylolethane tetrabenzoate, tridichlorohexyl citrate, methoxyethyl stearate. -A urea complex etc. can be mentioned.

  It is desirable that the activation temperature of the delayed tack type adhesive does not exceed 130 degrees C. That is, when the activation temperature is higher than 130 ° C., the energy required for the activation becomes large, a load is applied to the heating apparatus, and the parts are easily consumed and easily broken. Furthermore, in this case, the time required for the activation of the pressure-sensitive adhesive becomes long, and the issuing speed of the delivery slip 1 becomes slow. In general, when the activation temperature is less than 80 degrees C., activation may start at a temperature of 70 degrees C or less, so in the summer when the temperature in the transport vehicle reaches 70 degrees C. Although the adhesive property of the delayed tack-type pressure-sensitive adhesive layer 4 is manifested, blocking may occur, and the paper may be broken or the heat-sensitive recording layer may be destroyed. Such an inconvenience does not occur in the present embodiment in which there exists. Therefore, in general, a delayed tack type adhesive having an activation temperature of 80 to 130 ° C. is preferable, more preferably 90 to 110 in consideration of not blocking in the summer and not burdening the apparatus. It is a range of degree C. However, in the present embodiment where the release varnish layers 20, 20 a, and 21 are present, the activation temperature may not exceed 130 ° C. The adjustment of the activation temperature is such that the melting point of the wax or solid plasticizer is the activation temperature of the delayed tack type adhesive, so that the wax or solid plasticizer in the adhesive component has a melting point of 130 ° C. or less. Use it.

  Furthermore, the release varnish layers 20, 20a, 21 are, for example, 1 to 20% by weight, more preferably 3 to 15% by weight of a reactive silicone oil having at least one acryloyl group or methacryloyl group that can be polymerized in response to ultraviolet rays. It is preferable to use an ultraviolet-curing medium varnish containing 1%. The release varnish layers 20, 20 a, and 21 can be easily formed by printing to a predetermined thickness by dry offset printing, more preferably flexographic printing, and have excellent peelability with respect to the activated delayed tack pressure-sensitive adhesive layer 4. It will be expensive.

  The release varnish layer 21 covering the heat-sensitive recording layer 3 reduces blocking of the thermal head during printing as well as preventing blocking. Further, in addition to preventing color development of the heat-sensitive recording layer 3 by rubbing heat, water resistance and contamination resistance are also provided. It also contributes to the improvement of sex. Moreover, although it is common also to the peeling varnish layers 20 and 20a which coat | cover the delayed tack type adhesive layer 4, it is set as the surface layers 3 and 4 which do not melt | dissolve with the heat | fever of a thermal head by employ | adopting an ultraviolet curing medium varnish. be able to.

  Since the present embodiment is configured as described above, even if the delivery slip 1 is configured in a continuous form and stored in a state of being wound on a roll, the delayed tack type adhesive layers 4 are not in contact with each other. There is no blocking, and predetermined information can be printed in the information entry columns 12, 13, 17, and 18 smoothly and reliably by a thermal printer. Thereafter, the delayed tack-type pressure-sensitive adhesive is activated. At this time, the thermosensitive recording layer 3 does not develop color due to the influence of heat applied to the delayed-tack-type pressure-sensitive adhesive layer 4. Then, the delivery slip 1 on which the predetermined information is printed and the delayed tack type adhesive is activated is affixed to a delivery container (not shown) by the delayed tack type adhesive layer 4.

  At this time, since the delayed tack type adhesive layer 4 of the delivery / receipt slip 8 is covered with the release varnish layer 20, the delivery / receipt slip 8 is not in contact with the packaging container. The delivery is carried out in this state. At an appropriate time in this delivery operation, the delivery slip / receipt slip 8 attached to the packaging container is peeled off, and a receipt stamp is received in the receipt stamp column 14 at the delivery destination. Is. The delivery slip / receipt slip 8 is lifted and peeled off from the corner where the peeling start end display 15 is printed while breaking the cutting perforation 6, and the cutting perforation 5 is broken. 7 and sticker 9.

  In addition, this invention is not limited to embodiment mentioned above, For example, it is applicable also to label-like products other than the delivery slip 1, and when it is not necessary to peel once after adhesion | attachment, a peeling varnish layer 20 need not be provided. Further, the release varnish layer 21 for covering and protecting the heat-sensitive recording layer 3 can be provided on the entire surface when it is not necessary to ensure the suitability of the receipt stamping column 14, and in this case, the receipt stamping layer 21 can be provided. The strip-like peelable varnish layer 20a corresponding to the stamping column 14 is also unnecessary.

The top view of a delivery slip. AA sectional view taken on the line AA of FIG.

Explanation of symbols

1 delivery slip 2 slip paper 3 thermosensitive recording layer 4 delayed tack type adhesive layer 5, 6 perforation for cutting 7 title part 8 delivery slip / receipt slip 9 sticker slip 12, 17 delivery information entry column 13, 18 inquiry number entry column 14 Receipt seal column 20, 20a, 21 Peeling varnish layer

Claims (3)

A thermal recording label provided with a thermal recording layer on one side of the paper and a delayed tack type adhesive layer on the other side, and a release varnish layer having a thickness of 0.5 to 2.5 μm on at least one surface A heat-sensitive recording label characterized by comprising: 2. The thermal recording label according to claim 1, wherein the release varnish layer is made of a transparent ultraviolet curable medium varnish, and is provided so as to cover the entire surface only on the surface of the thermal recording layer. 2. The thermal recording label according to claim 1, wherein the release varnish layer is made of an ultraviolet curable medium varnish and is provided so as to cover a portion where activation of the delayed tack type adhesive layer is unnecessary.

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