Label

Abstract

To provide a label with a paper base material, which is less susceptible to curling and other deformation and prevents glue residue and paper tearing when peeling off the label.SOLUTION: A label of the present invention comprises a base material layer including paper and has a front surface and a back surface that can be adhered onto an object. In plan view, the label consists of an adhesive portion with a back surface to be adhered to an object, and a non-adhesive portion with a back surface that is not adhered to the object. The paper has an air permeability in excess of 10000 sec / 100 ml.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a label. [Background technology]

[0002] Since labels made from plastic materials have the potential to become marine waste plastic through disposal, etc., POP labels using a paper base material have been proposed (see, for example, Patent Document 1 (JP 2022-147110 A)). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-147110 A Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes that in a label using a paper base material, by providing a resin layer on the back surface of the paper base material (the surface opposite the printed surface), it is possible to suppress warping caused by elongation of the back surface even in a high-temperature, high-humidity environment.

[0005] However, when paper absorbs moisture, the pulp fibers expand and contract to no small extent, so there remains a possibility that labels using paper as a base material may become deformed, such as curled, wrinkled, or warped, due to moisture absorption. Furthermore, in labels that use a paper base material, the strength of the paper base material decreases when it absorbs moisture, so when the label is peeled off from an object, there is a possibility that glue (adhesive) residue or the paper may tear due to the adhesive or the adhesive and paper remaining on the object.

[0006] An object of the present invention is to prevent deformation such as curling in labels using a paper base material, and to prevent glue residue and paper tearing when the label is peeled off. [Means for solving the problem]

[0007] The label of the present invention comprises a substrate layer containing paper, and has a front surface and a back surface that can be attached to an object. In a plan view, the label is composed of an adhesive portion whose back surface is attached to the object, and a non-adhesive portion whose back surface is not attached to the object. The air permeability of the paper is greater than 10,000 sec / 100 mL. Effect of the Invention

[0008] According to the present invention, in a label using a paper base material, deformation such as curling can be suppressed, and adhesive residue and paper tearing when the label is peeled off can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a cross-sectional view showing the label of the embodiment (attached to an object). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or common parts are denoted by the same reference numerals.

[0011] <label> With reference to FIG. 1, a label 1 of this embodiment includes at least a base material layer 2 and is attachable to an object 5. The label 1 includes at least a base material layer 2 and is attachable to an object 5. The object 5 is not particularly limited, but examples thereof include the product itself, the product container, and the product packaging such as a paper box and a shrink label for the container (these may be referred to as "products, etc.").

[0012] The label 1 has a front surface 1a and a back surface 1b that can be attached to an object 5. In addition, when the label 1 is attached to the object 5 (attached state), the front surface 1a is the surface opposite the object 5, and the back surface 1b is the surface facing the object 5.

[0013] Further, the label 1 is composed of an adhesive portion 42 where the back surface 1b is attached to the object 5, and a non-adhesive portion 41 where the back surface 1b is not attached to the object 5, in a plan view.

[0014] The back surface 1b side of the adhesive portion 42 can be attached to the object 5. The back surface 1b side of the non-adhesive portion 41 is preferably not attachable to the object 5, but may be a portion that is not attached to the object 5 even if it is attachable.

[0015] In the attached state, the non-attached portion 41 of the label 1 is not attached to the object 5, and it is preferable that at least a part of the non-attached portion 41 of the label 1 protrudes outward (in the direction opposite to the attached portion 42, for example, upward or to the side) from the object 5. Such labels are called POP labels, attention labels, etc. POP labels are usually attached to the object 5 so that most of the non-attached portion 41 of the label 1 protrudes from the object 5 in order to increase visibility and advertising effectiveness. When the label 1 is used as such a POP label, the base layer 2 containing paper is exposed to a lot of air in the protruding portion of the label 1, and the paper is likely to absorb moisture. This makes it easy for the label to deform, such as curling, due to moisture absorption by the paper. In addition, when the label 1 is peeled off from the object 5, glue residue or tearing of the paper is likely to occur due to a decrease in strength of the base layer 2 caused by moisture absorption by the paper. For this reason, the effects of the present invention (suppression of deformation, and suppression of glue residue and tearing of the paper) are particularly useful for POP labels.

[0016] 1, the label 1 has a non-adhesive portion 41 on the tip side (upper side in the figure) in the protruding direction D, and an adhesive portion 42 on the base end side (lower side in the figure) in the protruding direction D. However, the arrangement of the non-adhesive portion 41 and the adhesive portion 42 is not particularly limited.

[0017] The area of ​​the non-adhesive portion 41 of the label 1 in a planar view (the non-adhesive portion 41 provided at the tip side in the protruding direction D) is preferably 30% or more of the total area of ​​the label 1, more preferably 50% or more, and even more preferably 60% or more. In addition, the length in the protruding direction D of the non-adhesive portion 41 of the label 1 (the non-adhesive portion 41 provided at the tip side of the protruding direction D) when viewed in a plane is preferably 30% or more of the entire length of the label 1 in the protruding direction D, more preferably 50% or more, and even more preferably 60% or more. When the proportion of non-adhesive portions 41 is large like this, the base layer 2 is exposed to a lot of air and the paper is prone to absorbing moisture, so the effects of the present invention (suppression of deformation, and suppression of glue residue and paper tears) are particularly useful.

[0018] (base material layer) The base layer 2 includes paper (paper base material). Here, the air permeability of the paper (paper substrate) is more than 10000 sec / 100 mL (greater than 10000 sec / 100 mL), preferably 20000 sec / 100 mL or more, more preferably 30000 sec / 100 mL or more, and even more preferably 50000 sec / 100 mL or more. The upper limit of the air permeability of the paper is not particularly limited, but is, for example, 200000 sec / 100 mL or less. The air permeability of paper is measured based on the Oken type testing machine method of JIS-P8117.

[0019] Thus, in this embodiment, paper with extremely high air permeability (i.e., paper with extremely low air permeability and low air permeability) is used as the base material of the label 1. This prevents air containing water vapor from passing through the base material layer 2, and prevents the paper from absorbing moisture, thereby preventing deformation of the label 1 (curling, wrinkling, bending, etc.) caused by the paper absorbing moisture, as well as glue residue and paper tearing when the label 1 is peeled off.

[0020] Paper having an air permeability of more than 10,000 sec / 100 mL (hereinafter, may be referred to as "low air permeability paper") is not particularly limited as long as it has an air permeability of more than 10,000 sec / 100 mL, and examples thereof include processed papers such as coated paper (water-resistant paper), glossy paper, matte paper, glassine paper, semi-glassine paper, paraffin paper, and wax paper. The paper preferably contains a paper material (pulp) as a main component. The pulp content in the paper base material is preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.

[0021] The basis weight of the low-permeability paper is preferably 30 to 120 g / m 2 and more preferably 50 to 100 g / m 2 It is. The thicker the paper (the larger the basis weight), the greater the air permeability (the lower the air permeability), but the significance of the present invention is to select a paper material with low air permeability within the range of thickness that can be used as a label base material.

[0022] The base layer 2 may be made of only low-air-permeable paper, or may be a laminate of low-air-permeable paper and another material. The other material may be a resin film or other paper (which may be low-permeability paper, high-permeability paper, or a combination thereof). Highly air-permeable paper is paper with an air permeability of 10,000 seconds / 100 mL or less. Examples of highly air-permeable paper include art paper, cast paper, fine paper, and craft paper.

[0023] Examples of materials for the resin film include polyolefin-based resins such as polyethylene-based resins, polypropylene (PP)-based resins, cyclic olefin-based resins, and copolymers containing polyethylene, polyester-based resins such as polyethylene terephthalate (PET), polyamide-based resins, polystyrene-based resins, and (meth)acrylic-based resins.

[0024] By using a high proportion of paper in the label 1 (base material layer 2), it is possible to reduce the environmental impact. Furthermore, when the material of the base layer 2 contains a plant-derived material, a biomass-derived material, a recycled material, a biodegradable material, or a natural material, the environmental impact can be further reduced.

[0025] The thickness (total thickness) of the base layer 2 is not particularly limited, but is preferably 40 to 200 μm, and more preferably 50 to 150 μm. If the thickness is less than 40 μm, the label will have a weak rigidity (stiffness) and the label will not be able to stand up due to poor accuracy in attaching the label with a labeler, etc. Also, if the thickness is 200 μm or more, the label will have too strong rigidity, which will cause it to peel off easily from the target object or its conformability to become poor, resulting in high manufacturing costs.

[0026] A design layer (not shown) formed of a print layer or the like may be formed on the front surface 1a of the label 1 (base material layer 2) in order to enhance visibility as a label and to exert an advertising effect. The method for forming the printed layer is not particularly limited, and ordinary gravure printing, flexographic printing, letterpress printing, offset printing, etc. can be used.

[0027] (Resin layer) At least one surface of the base layer 2 is preferably coated with a resin. In order to coat the base layer 2 with a resin, for example, a resin layer may be laminated on at least one surface of the base layer 2. Note that a part of the resin may permeate the base layer 2 deeper than the surface.

[0028] By covering the base layer 2 with resin, the permeation of air into the base layer 2 is further suppressed, which suppresses deformation caused by moisture absorption of the paper, glue residue, and paper tearing. In addition, the reinforcing effect of the resin increases the strength of the base layer 2, which also suppresses paper tearing when the label is peeled off. Furthermore, when a resin layer 21 is provided between the base material layer 2 and the adhesive layer 3, the bonding strength between the base material layer 2 and the adhesive layer 3 is increased, thereby suppressing glue residue when the label is peeled off.

[0029] The method for coating the base layer 2 with a resin (method for forming the resin layers 21, 22) is not particularly limited, and can be ordinary gravure printing, flexographic printing, letterpress printing, offset printing, etc. The resin layer may be formed by applying a liquid (coating liquid) containing a resin to the surface of the base layer 2 and drying it, or by laminating a resin film on the base layer 2 and performing thermocompression bonding or the like to form the resin layer. The resin layer is preferably formed by the same method as the printing layer, in which case the manufacturing equipment can be simplified and the manufacturing process can be made more efficient.

[0030] At least the back surface 1b of the non-adhesive portion 41 of the base layer 2 is preferably covered with a resin. This is because the back surface 1b of the non-adhered portion 41, which is not attached to the object 5, is a location where moisture absorption is likely to occur in the paper contained in the base layer 2. When the label 1 is a POP label, the back surface 1b of the non-adhered portion 41 is a portion that protrudes from the object 5 in the attached state, and the paper contained in the base layer 2 is particularly likely to absorb moisture. However, the entire back surface 1b of the base layer 2 may be covered with resin. In this case, moisture absorption by the base layer 2 is further suppressed, and the effect of reinforcing the base layer 2 is also enhanced.

[0031] 1, it is provided on both sides (both the front surface 1a and the back surface 1b) of the base material layer 2. In this way, it is more preferable that both sides of the base material layer 2 are covered with resin, and it is even more preferable that the entire surfaces of both sides of the base material layer 2 are covered with resin. In this case, moisture absorption by the paper contained in the base layer 2 is more reliably suppressed and the strength of the base layer 2 is further increased, so that the effects of the present invention (suppression of deformation, and suppression of glue residue and paper tearing) are more reliably achieved. In addition, when a printed layer or the like is provided on the front surface 1a side of the base layer 2 and the printed layer suppresses the penetration of air into the base layer 2, even if the resin layer on the front surface 1a side of the base layer 2 is omitted, the same effect can be achieved as when a resin layer is provided on both sides of the base layer 2.

[0032] The thickness of the resin layers 21 and 22 is not particularly limited, but is preferably 1 to 3 μm. If the thickness is too thin, the effect of the resin layer cannot be obtained, whereas if the thickness is too thick, curling may occur due to cure shrinkage of the resin layer.

[0033] (Adhesive layer) 1, the label 1 typically includes an adhesive layer 3 on the back surface 1b side of the attachment portion 42 of the label 1 (base material layer 2). The adhesive layer 3 enables the back surface 1b of the attachment portion 42 of the label 1 to be attached to an object 5.

[0034] The adhesive layer 3 contains an adhesive for attaching the label 1 (base material layer 2) to an object 5. The adhesive is not particularly limited, but is preferably one that has a suitable adhesiveness for a POP label. Examples of the adhesive include a pressure-sensitive adhesive and a heat-sensitive adhesive.

[0035] 1, the adhesive layer 3 is provided only on the back surface 1b of the adhesion portion 42, and the adhesive layer 3 is not provided on the back surface 1b side of the non-adhesive portion 41. This makes the back surface 1b of the adhesion portion 42 adhesive and the back surface 1b of the non-adhesive portion 41 non-adhesive. However, without being limited to such an embodiment, for example, an adhesive layer may be provided over the entire back surface 1b of the label 1 (base material layer 2), and a process may be performed to render the adhesive layer on the back surface 1b of the non-adhesive portion 41 non-adhesive (for example, a process of laminating a mask layer (glue suppressing layer) onto the adhesive layer), thereby making the back surface 1b of the adhesive portion 42 adhesive and the back surface 1b of the non-adhesive portion 41 non-adhesive. In addition, the deformation due to moisture absorption of the paper is more likely to occur in the former case, where no adhesive layer is provided on the back surface 1b of the base layer 2, than in the latter case (where the entire back surface 1b of the base layer 2 is covered by the adhesive layer), so the deformation suppression effect of the present invention is particularly useful.

[0036] The present invention is not limited to the above-described embodiment, and can be modified in various ways. Two or more embodiments selected from the various embodiments described above may be combined as appropriate, or at least one configuration (a portion of a configuration) selected from the various embodiments described above may be replaced with a portion of a configuration of another embodiment.

[0037] <Example> Examples of the present invention will be described below, but the present invention is not limited to these.

[0038] (Examples 1 to 4, Comparative Examples 1 to 4) Labels as shown in Fig. 1 were produced as Examples 1 to 4 and Comparative Examples 1 to 4. However, in each of the Examples and Comparative Examples, the presence or absence of a resin layer on the front side and a resin layer on the back side was changed as shown in Table 1. In Examples 1 to 4, a paper substrate made of paper having an air permeability of 80,000 sec / 100 mL (processed paper A: "60SB Release", Nippon Paper Papylia Co., Ltd.) was used as the substrate layer. The basis weight of processed paper A was 60 g / m 2 It is. In Comparative Examples 1 and 2, a paper substrate made of paper having an air permeability of 3000 sec / 100 mL (Processed Paper B: "64MCP-RG", Nippon Paper Papylia Co., Ltd.) was used as the substrate layer. The basis weight of Processed Paper B was 63 g / m 2 It is. In Comparative Example 3, a paper substrate made of paper having an air permeability of 10,000 sec / 100 mL (processed paper C: "Ryuoh Coat", Daio Paper Co., Ltd.) was used as the substrate layer. The basis weight of processed paper C was 65 g / m 2 It is. In Comparative Example 4, a paper substrate made of paper having an air permeability of 100 sec / 100 mL (fine paper: "Kishu Fine Paper N", Hokuetsu Corporation) was used as the substrate layer. The basis weight of the fine paper was 64 g / m 2 It is. The label had a square shape with a height of 50 mm and a width of 50 mm. In addition, an adhesive layer was provided on the label as shown in Figure 1. The adhesive layer was made of a hot melt pressure-sensitive adhesive ("JM-6145-F", Sekisui Fuller Co., Ltd.) and was provided on the edge of the label in an area of ​​10 mm high and 50 mm wide. Furthermore, a printing layer was provided over the entire front surface of the label.

[0039] <Air permeability measurement> The air permeability of the paper substrates used in the above examples and comparative examples was measured based on the Oken type testing machine method of JIS-P8117.

[0040] <Evaluation of curl level> The labels of the above-mentioned Examples and Comparative Examples were evaluated for the degree of curling. Specifically, the adhesive layer of each label (height 10 mm, width 50 mm) was attached to a glass slide and stored for one week in an air atmosphere under the three temperature and humidity conditions shown in Table 1. After storage, the distance between the tip of the label (curled label) (the point furthest from the main surface of the glass slide) and the glass slide (the length in the direction perpendicular to the main surface of the glass slide) was measured using a scale. The measurement results were evaluated based on the following three-level criteria. The evaluation results are shown in Table 1. ○: Curl within ±5mm range △: Curl within ±10mm range ×: Within ±10mm, or curl is so severe that measurement is impossible

[0041] <Evaluation of paper tear> After the above-mentioned one-week storage, the labels of the Examples and Comparative Examples were evaluated for paper tearing. Specifically, each label was completely peeled off from the slide glass by hand, and the presence or absence of tearing of the paper was visually evaluated based on the following three-level criteria. The evaluation results are shown in Table 1 (in parentheses). ○: No tears in the paper △: Minor tears in the paper ×: Paper is torn

[0042] [Table 1]

[0043] From the results of Example 1 and Comparative Examples 2 to 4 in Table 1, it can be seen that, for labels using a paper base material having resin layers on both sides, compared to Comparative Examples 2 to 4 in which the air permeability of the paper base material is 10,000 sec / 100 mL or less, Example 1 in which the air permeability of the paper base material is greater than 10,000 sec / 100 mL, curling of the label is suppressed, particularly under high temperature and high humidity conditions (temperature 23° C., humidity 60%, and temperature 40° C., humidity 80%). It can also be seen that paper tearing is suppressed under all storage conditions. Furthermore, from the results of Example 4 and Comparative Example 1, it can be seen that, for labels using a paper base material having no resin layers on both sides, in Example 4 in which the paper base material has an air permeability of more than 10000 sec / 100 mL, curling of the label is suppressed under conditions of a temperature of 23° C. and a humidity of 60%, compared to Comparative Example 1 in which the paper base material has an air permeability of 10000 sec / 100 mL or less. It can also be seen that paper tearing is suppressed under conditions of high temperature and high humidity (temperature 23° C., humidity 60%, and temperature 40° C., humidity 80%).

[0044] Furthermore, from the results of Examples 1 to 4, it can be seen that by laminating a resin layer on the paper substrate, curling of the label and tearing of the paper are suppressed under high temperature and high humidity conditions (temperature 23°C, humidity 60%, and temperature 40°C, humidity 80%). It can also be seen that the label of Example 3, in which the resin layer is provided only on the back side of the paper substrate, is more effective in suppressing curling and tearing than the label of Example 2, in which the resin layer is provided only on the front side of the paper substrate.

[0045] <Summary> The above-mentioned embodiments of the present invention will be illustrated below.

[0046] (1) A substrate layer including paper; A label having a front surface and a back surface that can be attached to an object, The label is configured, in a plan view, to have an adhesive portion, the back surface of which is attached to the object, and a non-adhesive portion, the back surface of which is not attached to the object; A label, wherein the air permeability of the paper is greater than 10,000 sec / 100 mL.

[0047] (2) A label described in (1), in which at least one surface of the base material layer is coated with a resin.

[0048] (3) A label as described in (2), in which the entire surfaces of both sides of the base layer are covered with resin.

[0049] (4) A label according to any one of (1) to (3), wherein when the label is attached to the object, at least a portion of the non-attached portion of the label protrudes outward from the object.

[0050] (5) The basis weight of the paper is 40 to 100 g / m 2 The label according to any one of (1) to (4), [Explanation of symbols]

[0051] 1. Label 1a Front 1b back side 2 Base material layer 3 Adhesive layer 41 Non-stick area 42 Adhesive part 5. Subject matter (products, etc.) D Projection direction

Claims

1. A substrate layer including paper, A label having a front surface and a back surface that can be attached to an object, The label is configured, in a plan view, to have an adhesive portion, the back surface of which is attached to the object, and a non-adhesive portion, the back surface of which is not attached to the object; A label, wherein the paper has an air permeability of more than 10,000 sec / 100 mL.

2. The label according to claim 1 , wherein at least one surface of the base layer is coated with a resin.

3. The label according to claim 2 , wherein both sides of the base layer are entirely coated with a resin.

4. The label according to claim 1 , wherein in an attached state in which the label is attached to the object, at least a part of the non-attached portion of the label protrudes outward from the object.

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