JP6209877B2 - Set of thermal transfer ink ribbon for linerless printing tape and linerless printing tape - Google Patents

Description

The present invention relates to a thermal transfer ink ribbon for a linerless printing tape used for labels, packaging, packaging, and the like.

Currently, various types of roll and linerless tapes with desired prints such as designs and characters on the market are mainly produced by applying adhesive coating to the printed film base material in a subsequent process and processing it in small rolls. It is.

In contrast, a printing tape supply device (see Patent Document 1) that can freely perform various types of printing on various tapes such as cellophane tape by a printing roller mechanism, and a printing tape that can perform desired printing There has been proposed a tape printing apparatus that performs printing simultaneously with the feeding of the tape, such as a tape printing apparatus by thermal transfer using a tape cartridge containing an ink ribbon (see Patent Document 2).

By using these printing devices, it is possible to print as many desired prints as necessary on various tapes. However, printing is performed simultaneously with the feeding of the tape, and the printed tape is used as it is after being cut. Since it was an apparatus, the printed tape was not wound into a roll and stored.

That is, the tape printed by the printing apparatus does not assume that the tape is wound again in a roll shape after printing. Therefore, no consideration is given to storing the printing surface and the adhesive surface of the tape in contact with each other after printing, and the printing surface and the adhesive surface are in contact with each other in a roll shape. After being stored as it was, the printing durability when the printed tape was pulled out again from the roll was insufficient, and there was a problem that the printed part of the tape was taken on the adhesive surface.

JP-A-2005-41197 JP 2000-62268 A

The present invention solves the above-described problem, and is a roll-shaped liner that is used for labeling, packaging, packaging, and the like by a desired printing by a tape printing apparatus by thermal transfer using a printing tape and a thermal transfer ink ribbon. When producing a printless tape, even if the printed tape is rolled up so that the printed surface and the adhesive surface are in contact with each other and stored, and the printed tape is pulled out again, the printed portion of the tape is removed on the adhesive surface. It is an object of the present invention to provide a linerless thermal transfer ink ribbon for a printing tape that prevents it from being formed.

1st invention is the thermal transfer ink ribbon which laminated | stacked the release layer, the colored layer, and the contact bonding layer in this order on one side (A surface) of the base material, Comprising: Melting | fusing point is 60-80 in the said release layer. ℃ in the range of linear adhesive hydrocarbons are used on the adhesive surface and the printing tape thermal transfer ink ribbon of linerless containing 70 to 100 wt% of paraffin wax main component Ri der acrylic adhesive A set of a thermal transfer ink ribbon for a linerless printing tape and a linerless printing tape comprising a linerless printing tape capable of thermal transfer printing on the opposite surface of the adhesive surface .

The second invention is characterized in that the release layer has a thickness in the range of 0.4 to 1.5 μm, and contains 25 to 45% by weight of polyamide resin as the binder resin of the colored layer . 1 is a set of a thermal transfer ink ribbon for a linerless printing tape according to the invention and a linerless printing tape.

According to the present invention, when a desired liner is printed by a tape printing apparatus by thermal transfer using a printing tape and a thermal transfer ink ribbon, and a roll-like linerless printing tape used for labeling, packaging, packing, etc. is produced, printing is performed. Liner-less printing that prevents the printed part of the tape from being taken up by the adhesive surface even when the printed tape is drawn out again after being wound up in roll form so that the printed surface and the adhesive surface are in contact with each other A thermal transfer ink ribbon for tape can be provided.

The configuration of the thermal transfer ink ribbon according to the present invention will be described below with examples. The thermal transfer ink ribbon of the present invention is obtained by laminating a release layer, a colored layer, and an adhesive layer in this order on one surface (surface A) of a substrate.

As a base material in the present invention, a polyester film such as a polyethylene terephthalate film (PET), a polyethylene naphthalate film (PEN), a polyarylate film, a polycarbonate film, a polyamide film, an aramid film, and other films for a base material of a thermal transfer ink ribbon Various commonly used plastic films can be used. The thickness of the substrate is preferably in the range of 1 to 10 μm, and more preferably in the range of 2 to 6 μm, from the viewpoint of improving heat conduction.

It is preferable to provide a heat-resistant layer on the back surface (B surface) of the substrate. Examples of the material for the heat-resistant layer include silicone resins, fluororesins, nitrocellulose resins, and various heat-resistant resins such as silicone-modified urethane resins and silicone-modified acrylic resins, or lubricants for these heat-resistant resins. And the like.

The release layer, which is a feature of the present invention, contains 70 to 100% by weight of a paraffin wax whose main component is a linear hydrocarbon having a melting point in the range of 60 to 80 ° C.

That is, by using paraffin wax mainly composed of linear hydrocarbons in the release layer, the ink of the thermal transfer ink ribbon is thermally transferred to the printing tape, and the printed tape and the adhesive surface are in contact with each other. It has been found that when a tape printed again is pulled out from a roll after being wound into a shape and stored, the printed portion of the tape is not taken on the adhesive surface.

Paraffin wax is mainly composed of linear hydrocarbons (n-paraffins), but contains a small proportion of low molecular weight oily components. When such paraffin wax is used in the release layer, low molecular weight oily components bleed from the paraffin wax that will be present in the upper layer of the thermal transfer printed image to the printing surface, thereby printing tape. The adhesive force between the pressure-sensitive adhesive surface and the printing surface is reduced, and the printed portion of the tape is prevented from being removed by the pressure-sensitive adhesive surface. Furthermore, since paraffin wax has low polarity, the adhesive force with the acrylic adhesive used for the adhesive surface of a printing tape is weak, and the printing part of a tape will not be taken by an adhesive surface. The more the content of paraffin wax in the release layer is, the higher the effect of reducing the adhesive force between the pressure-sensitive adhesive surface and the printing surface is. Therefore, the content of paraffin wax is 70% by weight or more in the release layer. Is preferred.

As the paraffin wax has a lower melting point, the content ratio of the low molecular weight oily component becomes higher. Therefore, the paraffin wax in the release layer preferably has a low melting point. However, paraffin wax having a melting point in the range of 60 to 80 ° C. is more preferable in consideration of pancake storability (blocking resistance) and thermal transfer properties of the thermal transfer ink ribbon.

In the release layer, other wax-like substances, such as wood wax, beeswax, lanolin, carnauba wax, candelilla wax, montan wax, ceresin wax, and the like; Synthetic wax such as oxidized wax, ester wax, low molecular weight polyethylene wax, Fischer-Tropsch wax, α-olefin-maleic anhydride copolymer wax; lauric acid, myristic acid, palmitic acid, stearic acid Higher fatty acids such as behenic acid; higher fatty alcohols such as stearyl alcohol and docosanol; esters such as higher fatty acid monoglycerides, fatty acid esters of sucrose and fatty acid esters of sorbitan; May be appropriately used alone or two or more of such amides and bisamides such as Ruamido.

Furthermore, in addition to the wax-like substance, the release layer may contain a filler, oils, fatty acids, etc. as necessary. Not included.

The paraffin wax and the wax-like substance may be in the form of particles in the release layer.

The thickness of the release layer is preferably in the range of 0.4 to 1.5 μm, and more preferably in the range of 0.5 to 1.0 μm. When the thickness of the release layer is less than 0.4 μm, the thermal transfer property (release property from the substrate) of the thermal transfer ink tends to be inferior. On the other hand, if the thickness of the release layer exceeds 1.5 μm, the amount of heat required to melt the release layer increases, so that the transfer sensitivity of the thermal transfer ink ribbon is inferior and the adhesion to the substrate is reduced. The thermal transfer ink tends to drop off from the substrate.

The colored layer in the present invention is mainly composed of a thermoplastic resin binder and a colorant, and is provided on the release layer.

Examples of the thermoplastic resin (including elastomer) include ethylene-vinyl acetate copolymer, ethylene-vinyl butyrate copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid alkyl ester copolymer. Polymer, ethylene-acrylonitrile copolymer, ethylene-acrylamide copolymer, ethylene-styrene copolymer such as ethylene-styrene copolymer, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl alcohol copolymer Vinyl chloride (co) polymers such as polymers, acrylic resins, polyester resins, polyamide resins, epoxy resins, phenol resins, acetophenone-formaldehyde resins, cellulose resins, natural rubber, styrene-butadiene copolymer Polymer, isoprene polymer, chloroprene polymer Petroleum resins, styrene resins, rosin resins, terpene resins, coumarone - indene resins, and thermoplastic polyurethane resins. These resins may be used alone or in combination of two or more.

Among them, when a polyamide resin is used as a binder for the colored layer, it can be dissolved and coated in a solvent incompatible with the paraffin wax that is the main component of the release layer. The release layer and the colored layer are not mixed at the interface. Therefore, when the ink is thermally transferred and printed on the printing tape, the release layer and the colored layer are printed in a state of being laminated in two layers. Thus, after the printed tape is wound and stored in a roll shape so that the printing surface and the adhesive surface are in contact with each other, when the printed tape is pulled out again, the release layer and the coloring layer of the printed image are removed. Since the interlayer adhesion is weak, even if a part of the release layer is taken on the adhesive surface of the tape, the colored layer is prevented from being taken on the adhesive surface. Therefore, it is more preferable to use a polyamide resin for the binder resin of the colored layer.

In addition, as binder resin content in a colored layer, the range of 25 to 45 weight% is preferable. When the content is less than 25% by weight, the cohesive strength of the colored layer is reduced, and when the printed tape is pulled out, cohesive failure occurs in the colored layer, and the colored layer is easily taken on the adhesive surface of the tape. Further, if the content exceeds 45% by weight, the print density is lowered.

As the colorant in the colored layer, organic and inorganic color pigments and dyes such as carbon black generally used as a colorant for thermal transfer ink ribbons can be used. Moreover, you may mix | blend a dispersing agent, an antistatic agent, etc. with a coloring layer as needed.

The thickness of the colored layer is preferably in the range of 0.2 to 0.8 μm, and more preferably in the range of 0.3 to 0.6 μm. If the thickness is less than 0.2 μm, the print density tends to be inferior. On the other hand, if the thickness exceeds 0.8 μm, the amount of heat required to melt the colored layer increases, and the transfer sensitivity tends to be inferior.

The adhesive layer in the present invention is mainly composed of waxes and / or thermoplastic resins, and is provided on the colored layer.

Examples of the waxes in the adhesive layer include plant waxes such as carnauba wax and candelilla wax, animal waxes such as lanolin, mineral waxes such as montan wax, petroleum waxes such as paraffin wax and microcrystalline wax, and polyethylene. Synthetic waxes such as wax and Fischer-Tropsch wax can be used. Examples of the thermoplastic resin in the adhesive layer include ethylene / vinyl acetate copolymer, styrene resin, acrylic resin, polyester resin, polyamide resin, ketone resin, polyethylene resin, epoxy resin, and petroleum resin. A rosin resin can be used. These waxes and the thermoplastic resin may be in the form of particles in the adhesive layer.

The thickness of the adhesive layer is preferably in the range of 0.3 to 0.8 μm, and more preferably in the range of 0.4 to 0.6 μm. When the thickness is less than 0.3 μm, the adhesive force to the surface of the printing tape is not sufficient, and the fixability of the printed matter tends to be inferior. On the other hand, if the thickness exceeds 0.8 μm, the amount of heat required to melt the adhesive layer and develop the adhesive force increases, so that the transfer sensitivity tends to be inferior.

The thermal transfer ink ribbon of the present invention is capable of thermal transfer printing on the surface opposite to the adhesive surface of a linerless roll tape by a tape printing apparatus having a thermal transfer mechanism, and the desired printed tape is adhered to the printed surface. Even when the printed tape is drawn out again after being wound in a roll shape so as to be in contact with the surface, a printing tape can be provided in which the printed portion of the tape is not taken on the adhesive surface.

Next, the present invention will be specifically described with reference to Examples 1 to 15 and Comparative Examples 1 to 6. The scope of the present invention is not limited by these.

[Formation of Release Layer] A silicone resin heat-resistant layer having a thickness of 0.2 μm is provided on the back surface (B surface) of a 4.5 μm thick PET film substrate, and Table 1 is provided on the other surface (A surface). Example 1 Each of the release layer formulations shown in Table 2 was prepared as an emulsion solution, coated so that the film thickness after drying was as shown in Tables 1 and 2, and dried to give Example 1. -15 and the release layer of Comparative Examples 1-6 were formed.

[Formation of colored layer] Next, among the colored layer formulations shown in Tables 1 and 2, the colored layer formulations of Examples 1 to 9 were dissolved in methyl ethyl ketone, and the colored layers of Examples 10 to 15 and Comparative Examples 1 to 6 were used. The formulation is a release layer of Examples 1 to 15 and Comparative Examples 1 to 6 so that a coating solution dissolved in isopropyl alcohol is prepared and the film thickness after drying is as shown in Tables 1 and 2. Each colored layer was formed by coating on and drying.

[Formation of Adhesive Layer] Further, on the colored layers of Examples 1 to 15 and Comparative Examples 1 to 6, an emulsion coating solution having the following formulation was applied, dried and adhered to a thickness of 0.5 μm. A layer was formed to prepare each thermal transfer ink ribbon.
Adhesive layer ink formulation Carnauba wax 12.0 parts by weight Methanol 73.0 parts by weight Water 15.0 parts by weight Total 100.0 parts by weight

Using each of the obtained thermal transfer ink ribbons, print transferability to a printing tape and evaluation of printing on an adhesive surface were evaluated based on the following evaluation methods. The results are shown in Tables 1 and 2.

(1) Evaluation of print transferability to printing tape Using each of the thermal transfer ink ribbons described above, on a PET substrate subjected to olefin-based release treatment of the printing tape (thickness 70 μm) with a thermal transfer printer (SR408, manufactured by SATO). Printing was performed, and the print transferability at that time was visually evaluated according to the following criteria.
Print transferability evaluation criteria ○: Good transferability ×: Poor transferability

(2) Printed evaluation on adhesive surface Using each of the thermal transfer ink ribbons, the tape printed by the thermal transfer printer is divided into a printed surface and an adhesive surface (thickness 20 μm) of a tape composed of an acrylic adhesive. After being wound up in a roll shape so as to come into contact and stored at room temperature for 7 days, the printing on the tape adhesive surface when the printed tape was pulled out again was visually evaluated according to the following criteria. Note that the initial adhesive strength of the tape used for printing and evaluation is 9.5 N / 25 mm (conforms to JIS Z0237).
Criteria for evaluation of printed marks A: No printed marks are removed.
○: Almost no print is taken out.
X: Printed out.

Claims (2)

A thermal transfer ink ribbon in which a release layer, a colored layer, and an adhesive layer are laminated in this order on one surface (A surface) of a substrate, and the melting point is in the range of 60 to 80 ° C. in the release layer. linear hydrocarbons adhesive acrylic adhesive der used on the adhesive surface and the printing tape thermal transfer ink ribbon of linerless containing 70 to 100 wt% of paraffin wax main component is, the adhesive surface A set of a thermal transfer ink ribbon for a linerless printing tape and a linerless printing tape, comprising a linerless printing tape capable of thermal transfer printing on the opposite surface . 2. The liner according to claim 1, wherein the release layer has a thickness in a range of 0.4 to 1.5 μm, and contains 25 to 45 wt% of a polyamide resin as a binder resin of the colored layer. A set of thermal transfer ink ribbon for printless tape and linerless print tape.