Lamination label

Abstract

To provide a lamination label that has a simple structure and thus is easy to manufacture.SOLUTION: A lamination label has a first substrate 10, a primer layer 20, an ink layer 30, an adhesive layer 40, a second substrate 50, and a pressure-sensitive adhesive layer 60, in this order. In the lamination label, when the pressure-sensitive adhesive layer is caused to adhere to a SUS304 plate (surface finish BA) and peeled at a 180° angle, peel strength between the pressure-sensitive adhesive layer and the SUS304 plate is 4 N / 10 mm or more, and a smaller one of peel strength between the ink layer and the adhesive layer and peel strength between the ink layer and the primer layer is 1.5 N / 10 mm or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to laminated labels.

Background Art

[0002] Conventionally, in a state where labels are laminated, information printed inside the label is hidden, and a multilayer label has been developed that allows the information to be viewed by peeling off a part of the label.

[0003] For example, Patent Document 1 discloses a multilayer label comprising a laminate in which an upper layer label / an adhesive layer / a lower layer label are sequentially laminated, a first printing layer is formed on the surface of the upper layer label, and a second printing layer is formed on the surface of the lower layer label, respectively. In the multilayer label in which the second printing layer is hidden by the upper layer label and the first printing layer, a cut-off portion surrounded by a perforation line is formed in the upper layer label, and the second printing layer is formed on the surface of the lower layer label opposite to the cut-off portion. A transparent release layer that is slightly larger than the cut-off portion is formed between the adhesive layer and the second printing layer, and the perforation line is formed to a depth reaching the surface of the transparent release layer from the upper layer label.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the multilayer label disclosed in Patent Document 1 has a problem that it has many components and is time-consuming to manufacture.

[0006] The present invention has been made in view of such points, and an object thereof is to provide a laminated label that is easy to manufacture.

Means for Solving the Problem

[0007] The laminated label of the present invention has a first base material, a primer layer, an ink layer, an adhesive layer, a second base material, and an adhesive layer in this order. When the adhesive layer is adhered to a SUS304 plate (surface finish BA) and 180° peeling is performed, the peeling strength between the adhesive layer and the SUS304 plate is 4 N / 10 mm or more, and the smaller of the peeling strength between the ink layer and the adhesive layer and the peeling strength between the ink layer and the primer layer is 1.5 N / 10 mm or less. The laminated label of the present invention has a simple structure and is easy to manufacture. When attempting to peel off the laminated label after adhering the adhesive layer to an adherend, peeling occurs between the ink layer and the adhesive layer or between the ink layer and the primer layer.

[0008] The first base material or the primer layer may have a display concealment function that prevents the information displayed by the ink layer from being read when viewed from the surface opposite to the surface of the first base material facing the primer layer. With such a configuration, a difference can be created in the information displayed between the state where the laminated label is adhered to the adherend and the state after being peeled off from the adherend.

[0009] The first base material and the primer layer have light transmissivity, and the information displayed by the ink layer may be readable when viewed from the surface opposite to the surface of the first base material facing the primer layer. With such a configuration, after the laminated label is peeled off from the adherend, the information on the peeled part can be used at another location.

[0010] The adhesive layer may further have a release base material on the surface opposite to the surface facing the second base material. With such a configuration, it can be stored and used as a single-sheet label.

[0011] The surface of the first substrate opposite to the surface facing the primer layer may further have a release agent layer. With such a configuration, a plurality of labels can be stored and used as one roll.

[0012] The ink layer may mainly contain an electrostatic ink composition. With such a configuration, it can be used in a digital printing machine using electrostatic ink capable of handling small lots.

[0013] The adhesive constituting the adhesive layer may be a solvent-free type. With such a configuration, the adhesive layer can be formed without a drying process, and the cost and manufacturing time can be reduced.

Advantages of the Invention

[0014] It has a simple structure, the peel strength between the adhesive layer and the SUS304 plate is 4 N / 10 mm or more, and the smaller of the peel strength between the ink layer and the adhesive layer and the peel strength between the ink layer and the primer layer is 1.5 N / 10 mm or less. Therefore, when trying to peel off the label, it peels off between the ink layer and the adhesive layer or between the ink layer and the primer layer. Therefore, there is no need to provide a separate release layer, and the manufacturing becomes easy.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0017] (Embodiment 1) FIG. 1 is a schematic cross-sectional view of a laminated label 100 according to Embodiment 1. The laminated label 100 of the present embodiment has, in this order, a first base material 10, a primer layer 20, an ink layer 30, an adhesive layer 40, a second base material 50, and an adhesive layer 60. Since the adhesive layer 60 is brought into contact with the adherend for bonding, the first base material 10 becomes the uppermost layer.

[0018] The first base material 10 may be a flexible base material, for example, biaxially stretched polypropylene (OPP), polyethylene terephthalate (PET), oriented polyamide (OPA), unstretched polypropylene (CPP), linear low density polyethylene (LLDPE), and low density polyethylene (LDPE). OPP is preferred in terms of cost and ease of handling.

[0019] As the first base material 10, for example, a composite film in which a metal foil is laminated on a flexible base material may be used, or a vapor deposition film in which a metal is vapor deposited on a flexible base material may be used. Alternatively, an opaque masking layer may be provided on the first base material 10. The thickness of the first base material 10 is preferably 7 μm or more and 150 μm or less, more preferably 15 μm or more and 90 μm or less, and even more preferably 20 μm or more and 80 μm or less.

[0020] The primer layer 20 preferably contains a resin. Examples of the resin include polyvinyl alcohol resin, cellulose-based resin, polyester, polyamine, polyethyleneimine resin, polyamide resin, polyurethane, polyacrylic polymer hydroxyl-containing resin, carboxyl group-containing resin, and amine-based polymer. By providing the primer layer 20 on the first base material 10 to be printed, printing of an electrostatic ink composition using a digital printing machine can be performed smoothly. The coating amount of the resin constituting the primer layer 20 is 0.01 g / m 21.5 g / m or more 2 or less is preferable, or 0.05 g / m 2 or more and 1.0 g / m 2 or less is more preferable.

[0021] The surface of the primer layer 20 opposite to the surface facing the first base material 10 is the printing surface. An ink layer 30 is provided on the printing surface. The ink layer 30 preferably contains an electrostatic ink composition as a main component. That is, it is preferable that 50% by mass or more is composed of the electrostatic ink composition. The electrostatic ink composition is an ink composition used for liquid electrophotographic printing, that is, electrostatic printing. The ink layer 30 is provided by electrostatic printing using a digital printing machine (for example, the "Indigo 20000 Label and Package Digital Printing Machine" manufactured by HP is suitable). The electrostatic ink composition in the present invention preferably uses an electrostatic ink composition (HP Indigo electroink) containing a thermoplastic resin containing a copolymer of ethylene acrylic acid and ethylene methacrylic acid. As other components, it contains colorants such as pigments and dyes, and resins, and may further contain a carrier fluid or a carrier liquid. Further, the electrostatic ink composition may contain, for example, a charge director, a charge adjuvant, a surfactant, a viscosity modifier, an emulsifier, and other additives. In FIG. 1, the ink layer 30 is provided so as to cover the entire one surface of the primer layer 20, but it may be provided so as to be scattered on the printing surface of the primer layer 20 or so as to cover a part thereof.

[0022] The above digital printing machine and electrostatic ink composition are general-purpose products, and are easy to obtain and incorporate into the production line. Therefore, laminated labels can be easily manufactured.

[0023] The ink application amount in the ink layer 30 is 0.5 g / m 2 or more and 8.0 g / m 2 or less is preferable, and 1.0 g / m 2 or more and 6.0 g / m 2 or less is more preferable. Also, the lower limit of the application amount is 2.0 g / m 2More preferably, it is as described above, and it may be 3.0 g / m 2 or more. Here, the ink application amount means the total amount (solid content) of the ink composition used for printing, and when printing in multiple colors, it means the total value thereof.

[0024] An adhesive layer 40 is provided on the surface of the ink layer 30 opposite to the surface facing the primer layer 20, and the ink layer 30 and the adhesive layer 40 are adhered to each other. The adhesive composition constituting the adhesive layer 40 contains a polyol and a polyisocyanate and does not contain a solvent, that is, a so-called solvent-free type. At least a part of these two components (polyol, polyisocyanate) may react with each other and cure to form a cured product. That is, the adhesive composition may be composed of at least one of an adhesive composition containing a polyol and a polyisocyanate and a cured product thereof, and the adhesive layer 40 may be composed of an adhesive composition, a cured product thereof, or a mixture thereof. The polyol and the polyisocyanate react with each other as a main agent and a curing agent, respectively, to produce polyurethane (urethane adhesive).

[0025] The second substrate 50 may be a flexible substrate, for example, biaxially stretched polypropylene (OPP), polyethylene terephthalate (PET), oriented polyamide (OPA), unstretched polypropylene (CPP), linear low density polyethylene (LLDPE), and low density polyethylene (LDPE). OPP is preferred in terms of cost and ease of handling. The thickness of the second substrate 50 is preferably 7 μm or more and 150 μm or less, more preferably 15 μm or more and 90 μm or less, and even more preferably 20 μm or more and 80 μm or less. It is preferable that the first substrate 10 is thicker than the second substrate 50 because it is easier to peel off with a raised edge.

[0026] Examples of the adhesive constituting the adhesive layer 60 include an acrylic adhesive, a rubber adhesive, a polyester adhesive, and a polyurethane adhesive.

[0027] The manufacturing method of the laminated label of the present embodiment is, for example, the following method.

[0028] First, a primer layer 20 is formed on one surface of the film constituting the first substrate 10. Then, an electrostatic ink composition is printed on the surface of the primer layer 20 opposite to the surface facing the first substrate 10 to form an ink layer 30. Next, the ink layer 30 and the film constituting the second substrate 50 are adhered using an adhesive composition constituting an adhesive layer 40. Then, an adhesive is applied to the surface of the second substrate 50 opposite to the surface facing the adhesive layer 40 to form an adhesive layer 60.

[0029] <Measurement of peel strength> Regarding the laminated label 100 having the above-described configuration, samples described in Table 1 (samples in which the type of the adhesive constituting the adhesive layer was changed) were prepared and the peel strength was measured.

[0030] All of these samples used an OPP film (thickness: 30 μm) as the first substrate 10, a primer manufactured by Michelman Co., Ltd. under the product name MFP4300 (coating amount: approximately 1.0 g / m 2 ) as the primer layer 20, and an electrostatic ink composition containing a thermoplastic resin containing a copolymer of ethylene acrylic acid and ethylene methacrylic acid (HP Indigo electroink, coating amount: 0.8 to 1.0 g / m 2 ) for printing with a digital printing machine (HP's "Indigo20000 Digital Printing Machine for Labels and Packages").

[0031] As the adhesive layer 40, a polyurethane resin from different supply manufacturers with polyisocyanate as the main agent and polyol as the curing agent was used. As shown in Table 1, nine types of polyurethane resins were used as the adhesive for the adhesive layer 40.

[0032] Furthermore, labels were produced using a PET film (thickness: 12 μm) as the second substrate 50 and two types of an emulsion-based solvent-type acrylic adhesive and a rubber-based adhesive as the adhesive layer 60.

[0033] These samples were cut into strips with a width of 25 mm and bonded to a SUS304 plate with a surface finish BA with an adhesive layer 60, and the peel strength was measured. Note that the peel strength in this specification means the 180-degree peel adhesion strength measured in accordance with the description in JIS K 6854-2:1999, and the adherend used is a SUS304 plate with a surface finish BA.

[0034] The peel strength was measured for two types, between the ink layer 30 and the adhesive layer 40 and between the adhesive layer 60 and the adherend, and each was converted to a value in terms of a 10-mm width. Table 1 shows the peel strength between the ink layer 30 and the adhesive layer 40 as the strength.

[0035]

Table 1

[0036] The peel strength between the ink layer 30 and the adhesive layer 40 was maximum for Sample No. 2 at 1.30 N / 10 mm and minimum for Sample No. 6 at 0.276 N / 10 mm. On the other hand, the peel strength between the adhesive layer 60 and the adherend (SUS plate) was 5.52 N / 10 mm when an acrylic adhesive was used as the adhesive and 9.19 N / 10 mm when a rubber-based adhesive was used.

[0037] For all samples, when peeled from the adherend after being attached to the adherend, if not specifically noted, peeling occurred between the ink layer 30 and the adhesive layer 40, and the adhesive layer 60 did not peel from the adherend. This is considered to occur because the peel strength between the ink layer 30 and the adhesive layer 40 is at most 1.30 N / 10 mm, while the peel strength between the adhesive layer 60 and the adherend (SUS plate) is 5.52 N / 10 mm or more, and there is a large difference between the two.

[0038] The adhesive described in Table 1 is an adhesive made of a polyurethane resin and has a specific viscosity range in the state of a prepolymer obtained by mixing a polyisocyanate and a polyol.

[0039] In electrostatic printing using a digital printing machine for printing electrostatic ink, the commonly used primer layer is equivalent to that used in the above samples, and the first substrate and the second substrate are also equivalent to those commonly used as laminated labels.

[0040] When the laminated label 100 of the present embodiment is peeled after bonding the adhesive layer 60 to the adherend, as described above, the adhesive layer 60 remains adhered to the adherend and peels between the ink layer 30 and the adhesive layer 40. Therefore, with such a simple configuration, as in the usage modes described below, the information displayed by the ink layer 30 cannot be confirmed from the surface opposite to the surface of the first substrate 10 facing the primer layer 20 because the first substrate 10 or the primer layer 20 has a concealment function. However, when the laminated label 100 is peeled, the display information appears and can be visually recognized because it peels between the ink layer 30 and the adhesive layer 40. The laminated label 100 of the present embodiment can be used in a mode where the information displayed by the ink layer 30 can be visually recognized from the surface opposite to the surface of the first substrate 10 facing the primer layer 20 and the information is displayed on the peeled side when the laminated label 100 is peeled.

[0041] <Usage Mode 1 of Label> The laminated label 100 in the usage mode has a display concealment function in which the first substrate 10 or the primer layer 20 cannot read the information displayed by the ink layer 30 when viewed from the surface opposite to the surface of the first substrate 10 facing the primer layer 20 (the information can be read when peeled). The display concealment function can be imparted by making the first substrate 10 or the primer layer 20 itself a material through which light does not pass or by providing a light-blocking concealment layer on the first substrate 10.

[0042] Such a laminated label 100 in this usage mode can specifically be used, for example, as an eye - covering label for hiding addresses on postcards, a lottery label for notifying the winning or losing results of fortune - telling or lottery draws, a message label used when information needs to be hidden until peeled off, a campaign label with a two - dimensional code printed in the ink layer, and so on.

[0043] <Label usage mode 2> For the laminated label 100 in usage mode 2, the first substrate 10 and the primer layer 20 have light - transmissivity, and when viewed from the side opposite to the surface of the first substrate 10 facing the primer layer 20, the information displayed by the ink layer 30 can be read. Such a laminated label 100 can be manufactured by using a material for the first substrate 10 and the primer layer 20 that is transparent or has a thickness of several tens of μm and allows light to pass through to the extent that it can be visually observed.

[0044] Such a laminated label 100 in this usage mode can specifically be used, for example, as a score label where scores are displayed in the ink layer 30 and the peeled - off label is pasted on a backing sheet, an industrial label where lot information etc. is displayed in the ink layer 30 and the peeled - off label is stored, a trivia label where trivia is displayed in the ink layer 30 and the peeled - off label is collected, a recipe label where a recipe is displayed in the ink layer 30 and can be used without peeling or the peeled - off label can be separately stored, a message label where general content (for example, common words such as recommendations, thank - you, etc. are the information) is displayed in the ink layer 30 and the peeled - off label can be separately stored, a decoration label where a different pattern (the pattern 90 printed on the back surface of the second substrate 50 shown in FIG. 4, and this pattern 90 is hidden by the ink layer 30. Note that this pattern 90 may also be printed on the front side of the second substrate 50.) appears when peeled off and the pattern can be changed, or a tactile sensation due to an additive appears by adding an additive to the adhesive layer 40 and a mood change is possible, a half - price coupon label where the peeled - off label is used as a coupon in a café, restaurant, etc., for example, getting a free cup of coffee, a customer record label where the same number, symbol, etc. are displayed on both the peeled - off part and the remaining part, and so on.

[0045] <Usage mode 3 of the label> In addition, the laminated label 100 of this embodiment can also be used as a sanitary label in which the surface (first base material) that has been used once can be peeled off and the clean surface can be used again.

[0046] (Embodiment 2) The laminated label according to Embodiment 2 is obtained by placing a separator (release paper or release film) on the adhesive layer 60 of the laminated label 100 according to Embodiment 1. Therefore, the differences from Embodiment 1 will be described below.

[0047] FIG. 2 is a schematic cross-sectional structure of the laminated label 110 according to Embodiment 2. In the laminated label 100 of Embodiment 1, the surface opposite to the surface facing the second base material 50 of the adhesive layer 60 was exposed, but in the laminated label 110 of this embodiment, a separator 70 is placed on this exposed surface. As the separator 70, a known release paper or release film adapted to the type of the adhesive may be used.

[0048] The laminated label 110 according to Embodiment 2 exhibits the effects of Embodiment 1 and can be easily handled as a single-sheet label.

[0049] (Embodiment 3) The laminated label according to Embodiment 3 is obtained by providing a release agent layer on the first base material 10 of the laminated label 100 according to Embodiment 1. The differences from Embodiment 1 will be described below.

[0050] FIG. 3 is a schematic cross-sectional structure of the laminated label 120 according to Embodiment 3. In the laminated label 120 of this embodiment, on the first base material 10, a release agent layer 80 is placed on the surface opposite to the surface facing the primer layer 20. As the release agent constituting the release agent layer 80, a known release agent adapted to the type of the adhesive may be used. Further, an anchor layer may be formed on the first base material 10 and the release agent layer 80 may be provided thereon.

[0051] The laminated label 120 according to Embodiment 3 exhibits the effects of Embodiment 1 and can be easily handled as a roll-shaped continuous label by winding it up so that the adhesive layer 60 contacts the release agent layer 80.

[0052] (Other Embodiments) The above-described embodiments are examples of the present invention, and the present invention is not limited to these examples. Well-known techniques, conventional techniques, or known techniques may be combined with or partially replaced in these examples. Also, modified inventions that can be easily conceived by those skilled in the art are included in the present invention.

[0053] When the peel strength between the primer layer and the ink layer is also approximately the same as the peel strength between the ink layer and the adhesive layer, depending on whether the first peel occurs between the primer layer and the ink layer or between the ink layer and the adhesive layer, the peel interface may be either between the primer layer and the ink layer or between the ink layer and the adhesive layer. Even in such a case, if the adhesive layer can transmit light and the information displayed by the ink layer under the adhesive layer can be read, it can be used in the above-described usage modes.

Description of Reference Numerals

[0054] 10 First substrate 20 Primer layer 30 Ink layer 40 Adhesive layer 50 Second substrate 60 Adhesive layer 100 Laminated label 110 Laminated label 120 Laminated label

Claims

1. It has a first substrate, a primer layer, an ink layer, an adhesive layer, a second substrate, and an adhesive layer in this order, when the adhesive layer is adhered to a SUS304 plate (surface finish BA) and 180° peeling is performed, the peeling strength between the adhesive layer and the SUS304 plate is 4 N / 10 mm or more, and the smaller of the peeling strength between the ink layer and the adhesive layer and the peeling strength between the ink layer and the primer layer is 1.5 N / 10 mm or less, a laminated label.

2. The first substrate or the primer layer has a display concealment function that cannot read the information displayed by the ink layer when viewed from the surface opposite to the surface of the first substrate facing the primer layer, the laminated label according to Claim 1.

3. The first substrate and the primer layer have light transmissibility, and when viewed from the surface opposite to the surface of the first substrate facing the primer layer, the information displayed by the ink layer can be read, the laminated label according to Claim 1.

4. It further has a release substrate on the surface of the adhesive layer opposite to the surface facing the second substrate, the laminated label according to Claim 1.

5. It further has a release agent layer on the surface of the first substrate opposite to the surface facing the primer layer, the laminated label according to Claim 1.

6. The ink layer is mainly composed of an electrostatic ink composition, the laminated label according to Claim 1.

7. The adhesive constituting the adhesive layer is a solvent-free type, the label according to Claim 1.

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