Label media

Abstract

To provide a label medium that is less prone to lifting and less likely to peel off. [Solution] The perforated first starting point 31 is located between the first end 22 and the center 24 of the label 20 in the first direction. When the label 20, which has been attached to the adherend in a curved state, tries to return to its original shape due to internal stress, the label 20 bends at the first starting point 31 and is difficult to peel off. The tensile strength σ of the label 20 is set so that it bends reliably at the first starting point 31. max This is defined by equation (1). [Math 1] TIFF2026085999000020.tif15168

Description

[Technical Field]

[0001] This invention relates to a label medium in which a label is affixed to a backing sheet. [Background technology]

[0002] The label described in Patent Document 1 has perforated slits on the edge of the base material. There are multiple rows of slits, extending along the edge of the base material. When the label is applied along the axial direction of a cylindrical body, the edge curves to follow the surface of the cylindrical body due to each slit. Therefore, the edge does not lift up from the surface. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-182130 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] However, depending on the adhesive strength of the adhesive layer on the back of the substrate, the reaction force against the bending of the label could cause the edges of the label to lift, potentially leading to the label peeling off.

[0005] The objective of the present invention is to provide a label medium that is less prone to lifting and less likely to peel off. [Means for solving the problem]

[0006] According to one aspect of the present invention, a label medium having the following features is provided: The label medium includes a label having an adhesive layer for attaching to a substrate, and a backing sheet to which the label is attached via the adhesive layer. The label extends in a first direction and a second direction intersecting the first direction when not attached to the substrate.

[0007] The label has a first end, a second end, and a first starting portion. The first end is one end in the first direction. The second end is the other end in the first direction. The first starting portion is between the center of the label in the first direction and the first end, and is a portion that serves as a starting point when the label is bent in the third direction. The third direction is a direction that intersects the first direction and the second direction.

[0008] The first starting portion is a slit that extends in the second direction while penetrating the label in the third direction, and portions where the label is connected in the first direction are arranged at both ends. Alternatively, the first starting portion is a slit array in which a plurality of slits are arranged in the second direction. Or, the first starting portion is a fold that is recessed in the third direction on the surface of the label and extends in the second direction. And the first starting portion is arranged at one or more positions in the first direction.

[0009] In this aspect, the following are defined. Let the tensile strength of the label be σ max [N / mm 2 . Let the adhesive strength of the adhesive layer be W label [N / mm].

[0010] Let it be a specific position between the first starting portion and the second end in the first direction. The portion from the specific position to the second end is in a state of being attached to the adherend through the adhesive layer. Also, the portion from the specific position to the first end is in a state of not being attached to the adherend. In such a state, let the length between the first end and the specific position of the label in the first direction be L1 [mm].

[0011] Let the length between the first end and the first starting portion of the label in the first direction be L2 [mm]. Let the total length in the second direction of the starting cross-section be B1 [mm]. The starting cross-section is the cross-section at the first starting portion among the cross-sections orthogonal to the first direction of the label. Let the total length in the third direction of the starting cross-section be H1 [mm]. In this case, the label [Number] is satisfied.

[0012] In some cases, a label may be attached to an adherend where the surface height positions are different between the portion where one end of the label is attached and the portion where the other end of the label is attached. When the label is attached to such an adherend, the label is maintained in a state of being bent by the adhesive force of the adhesive layer. A stress corresponding to the load required to bend the middle portion is applied to the adhesive layer of the label in order to eliminate the bending of the label.

[0013] When the condition (1) is satisfied, since the tensile strength of the label is smaller than the stress applied to the first starting portion, the label breaks at the first starting portion. When the label breaks, the direction of the stress applied to the adhesive layer between the first starting portion and the first end changes to the direction along the surface of the adherend. Then, since the stress required to peel off the portion between the first starting portion and the first end from the adherend increases, the label is difficult to be peeled off. Therefore, a label medium in which a label that is difficult to have floating in the adhesive layer and is difficult to be peeled off is attached to a backing paper is provided.

[0014] In this embodiment, further, the following are defined. Let the Young's modulus of the label be E [N / mm 2 . Let the length of the label in the second direction be B [mm]. Let the length of the label in the third direction be H [mm].

[0015] The portion from the specific position to the second end is in a state of being attached to the adherend through the adhesive layer. The portion from the specific position to the first end is in a state of not being attached to the adherend. In such a state, let the length by which the surface of the adherend and the first starting portion are separated in the third direction be X1 [mm]. In this case, the label } [Number] may be satisfied.

[0016] The adhesive layer of the label can ensure the required adhesive strength in the adhesive layer between the first starting point and the first end by satisfying equation (2). The required adhesive strength is an adhesive strength greater than or equal to the load required to bend the portion of the label between the first starting point and a specific position by X1 mm when the label is folded at the first starting point. Thus, a label medium is provided in which the adhesive layer is less likely to lift and peel off, and the label is attached to the backing paper.

[0017] In this embodiment, the following is further defined: The portion from the first starting point to the second end is attached to the adherend via the adhesive layer. The portion from the first starting point to the first end is not attached to the adherend. In this state, the distance between the surface of the adherend and the first end in the third direction is X2 [mm]. In this case, the label is

number

[0018] The adhesive layer of the label can satisfy equation (3) to ensure the required adhesive force in the adhesive layer between the first starting point and the first end. The required adhesive force is an adhesive force greater than or equal to the load required to bend the portion between the first end and the first starting point by X2 mm. Thus, a label medium is provided in which the adhesive layer is less prone to lifting and peeling, and the label is attached to the backing paper.

[0019] In this embodiment, the label may further have a second starting point. The second starting point is located between the center of the label and the second end in the first direction and is the starting point when the label bends in the third direction.

[0020] The second starting point may be a slit that extends in the second direction while penetrating the label in the third direction, with portions of the label connected in the first direction located at both ends. Alternatively, the second starting point may be a row of slits arranged in the second direction. Alternatively, the second starting point may be a fold that is recessed in the third direction on the surface of the label and extends in the second direction. Furthermore, the second starting point may be located at one or more locations in the first direction.

[0021] The label has a first starting point between the first end and the center in the first direction, and a second starting point between the second end and the center. Therefore, even when the label is attached to a substrate having a curved surface, lifting is less likely to occur at the edges including the first end of the label, and also less likely to occur at the edges including the second end of the label. Thus, a label medium is provided in which the adhesive layer is less likely to lift and is less likely to peel off, with the label attached to the backing paper.

[0022] In this embodiment, the label may further have a third end, a fourth end, a third starting point, and a fourth starting point. The third end is one end in the second direction. The fourth end is the other end in the second direction. The third starting point is located between the center of the label and the third end in the second direction and is the starting point when the label bends in the third direction. The fourth starting point is located between the center of the label and the fourth end in the second direction and is the starting point when the label bends in the third direction.

[0023] The third and fourth starting points may each be slits that extend in the first direction while penetrating the label in the third direction, with portions at both ends where the label is connected in the first direction. Alternatively, the third and fourth starting points may be rows of slits arranged in the first direction. Alternatively, the third and fourth starting points may be folds that are recessed in the third direction on the surface of the label and extend in the first direction. Furthermore, the third and fourth starting points may each be located at one or more locations in the second direction.

[0024] The worker may apply the label to the surface of the substrate with the first direction of the label aligned with it, or with the second direction aligned with it. In other words, the worker can apply the label to the substrate without having to consciously think about applying it in a direction that would make it difficult to peel off.

[0025] In this embodiment, the adhesive layer of the label may have a non-adhesive region between the first starting point and the second starting point in the first direction. The non-adhesive region may be a region that does not have an adhesive function to the adherend.

[0026] The worker is made aware of pressing the end of the label, including the adhesive first end, and the end of the label, including the adhesive second end, against the substrate. Therefore, the worker is encouraged to apply the label while pressing the end of the label, including the first end, and the end of the label, including the adhesive second end, against the substrate. Thus, a label medium is provided in which the adhesive layer is less likely to lift and the label is less likely to peel off, with the label attached to the backing paper.

[0027] In this embodiment, the adhesive layer of the label may have a weakly adhesive region between the first starting point and the second starting point in the first direction. The weakly adhesive region may be a region in which the adhesive force to the adherend is weaker than that of other regions of the adhesive layer.

[0028] The worker temporarily attaches the weakly adhesive area to the substrate, and then presses the end of the label, including the first end which has stronger adhesive force than the weakly adhesive area, and the end of the label, including the second end, onto the substrate. In this way, the worker can attach the label to the substrate while correcting the orientation of the label. [Brief explanation of the drawing]

[0029] [Figure 1] This is a perspective view of label sheet 1 and label printer 2. [Figure 2] This is a perspective view of label 20. [Figure 3]This diagram shows how label 20 is attached to the object 100. [Figure 4] This diagram shows how the label 20 attached to the substrate 100 bends at the first starting point 31. [Figure 5] Figure 2 shows a cross-sectional view of the label 20 at the first starting point 31, taken along line II, in the direction of the arrow. [Figure 6] This diagram shows the fixed portion 38 adhering to the object 100, with the pressing portion 36 and the floating portion 37 in a cantilevered state. [Figure 7] This is a perspective view of label 120 of the first modified example. [Figure 8] This is a perspective view of label 220 of the second modified example. [Figure 9] This is a perspective view of label 320 of the third modified example. [Modes for carrying out the invention]

[0030] One embodiment of the present invention is described below. The referenced drawings are used to illustrate the technical features that the present invention may adopt. That is, the configurations shown in the drawings are not intended to be the sole limiting factors, but are merely illustrative examples. In each drawing, for the sake of clarity, the proportions of the sizes of each component are shown in proportions different from those of the actual components.

[0031] The label sheet 1 shown in Figure 1 is an example of a label medium according to the present invention. The label sheet 1 is a strip-shaped sheet extending in the longitudinal and transverse directions. The longitudinal direction is the direction in which the label sheet 1 extends in a long strip shape. The transverse direction is the width direction of the strip-shaped label sheet 1 and intersects with the longitudinal direction. The label sheet 1 is provided, for example, in the form of a roll wound on a spool 1A.

[0032] The label sheet 1 comprises a backing sheet 10 and a label 20. The backing sheet 10 is a so-called release paper, in which a release agent, such as a silicone-based one, is applied to the adhesive surface 11 of a strip-shaped substrate extending in a first direction. The adhesive surface 11 of the backing sheet 10 is the surface that faces the label 20 when the label 20 has not been peeled off the backing sheet 10. The substrate can be, for example, glassine paper, fine paper, or kraft paper. A resin film or the like may also be used as the substrate.

[0033] The label 20 is a rectangular plate-shaped sheet made of a self-coloring, heat-sensitive sheet that has been pre-cut into multiple pieces by pre-cut notches 29 at predetermined intervals. The label 20 has a first surface 20A and a second surface 20B that extend in a first and second direction. The first direction is the short side of the label sheet 1. The second direction is the long side of the label sheet 1 and intersects the first direction. The first surface 20A of the label 20 is the side that faces the backing paper 10 when the label 20 has not been peeled off the backing paper 10, and the second surface 20B is the side opposite to the first surface 20A.

[0034] The label 20 has a printed layer 21 and an adhesive layer 26 laminated in a third direction. The third direction is the thickness direction of the label 20 and intersects the first and second directions. The printed layer 21 is, for example, thermal paper containing a coloring agent that develops color when heated. The adhesive layer 26 is a layer in which adhesive is placed on the first surface 20A of the label 20 in the printed layer 21. The label 20 is peelably attached to the adhesive surface 11 of the backing paper 10 with the adhesive layer 26.

[0035] The label sheet 1 is wound onto the spool 1A with the label 20 positioned on the inner circumference of the backing paper 10. The label sheet 1, still in roll form, is stored in the storage compartment 3 of the label printer 2. The label printer 2 is a device that prints various characters (letters, numbers, symbols, and shapes, etc.) onto the label sheet 1. The label sheet 1 is pulled out longitudinally from the storage compartment 3 and transported inside the label printer 2.

[0036] The thermal head of the label printer 2 heats the second surface 20B of the printing layer 21 to print the image. After printing, the label sheet 1 is transported to the output port and discharged outside the label printer 2. The operator peels the label 20 from the backing paper 10 and attaches it to the substrate 100.

[0037] The label 20 may be attached to an adherend 100 whose surface is curved outward, such as a spits tube. In this case, the label 20 is maintained in a bent state along the surface of the adherend 100 by the adhesive force of the adhesive layer 26. A reaction force acts on the label 20 due to internal stress, attempting to return it to its original shape. If the adhesive force of the adhesive layer 26 is weaker than the reaction force, the label 20 may lift from the adherend 100 and peel off.

[0038] Therefore, as shown in Figure 2, the label 20 has a first starting point 31 and a second starting point 32 that bend when the bending is about to be reversed by a reaction force, thereby preventing peeling. The first starting point 31 and the second starting point 32 in this embodiment are, for example, perforations. The perforations are composed of rows of slits that penetrate the label 20 in a third direction and extend in a second direction, with multiple slits arranged in the second direction.

[0039] The first starting point 31 is located between the first end 22 and the center 24 of the label 20 in the first direction. The first end 22 is one end of the label 20 in the first direction. The center 24 is the center position of the label 20 in the first direction. The second starting point 32 is located between the second end 23 and the center 24 of the label 20 in the first direction. The second end 23 is the other end of the label 20 in the first direction.

[0040] As shown in Figure 3, when attaching the label 20 to the adherend 100, the worker positions the label 20 with its first direction aligned with the circumferential direction of the adherend 100. The first starting point 31 and the second starting point 32 are positioned along the axial direction of the adherend 100. As shown in Figure 4, if the reaction force attempting to restore the label 20's flexibility is greater than the adhesive force of the adhesive layer 26, the adhesive layer 26 peels off the surface of the adherend 100, causing the label 20 to lift. If the label 20 bends at the first starting point 31, the first starting point 31 is lifted in a direction close to the perpendicular to the surface of the adherend 100, as shown by the dotted line in Figure 3.

[0041] The portion of the label 20 from the first end 22 to the first starting point 31 is pulled by the portion from the first starting point 31 to a specific position 35. The specific position 35 is the position where, if the label 20 lifts away from the adherend 100, it is assumed that the portion between the second end 23 and the specific position 35 can maintain its adhesion to the adherend 100. When the label 20 bends at the first starting point 31, the direction in which the portion from the first end 22 to the first starting point 31 is pulled is closer to the direction along the surface than to the direction perpendicular to the surface. Therefore, when the label 20 bends at the first starting point 31, the adhesive layer 26 of the portion from the first end 22 to the first starting point 31 becomes less likely to peel off from the surface of the adherend 100.

[0042] The first starting point 31 is not limited to a perforation, but may be a single slit extending in the second direction. The slit penetrates the printed layer 21 of the label 20 in the third direction, i.e., the thickness direction, and extends in the second direction, i.e., the width direction. The slit does not extend to the edge of the label 20 in the second direction. At both ends of the slit are portions where the label 20 is connected in the first direction. Therefore, the label 20 is not separated in the first direction by the slit.

[0043] Alternatively, the first starting point 31 may be a fold that is recessed in the third direction and extends in the second direction on the first surface 20A or the second surface 20B or both of the label 20. The fold does not penetrate the printed layer 21 of the label 20 in the third direction, i.e., the thickness direction. The fold may extend to the edge of the label 20 in the second direction, or it may not extend to the edge of the label 20. The fold may be configured as a series of short folds arranged in the second direction, like a row of slits.

[0044] In order to ensure that the first starting point portion 31 bends reliably when the label 20 lifts, the tensile strength σ of the label 20 is set. max [N / mm 2 This is defined by equation (1). In the following explanation, it is assumed that the portion from the specific position 35 to the second end 23 remains in a state of adhesion to the adherend 100, and that a lift occurs in the portion from the first starting point 31 to the specific position 35. In the case where the second starting point 32 bends, it is assumed that the same condition as when the first starting point 31 bends occurs in the opposite direction in the first direction, and this can be defined by equation (1).

[0045] The algebra relating to equation (1) is defined below. As shown in Figure 2, the length in the first direction between the first end 22 of the label 20 and the specific position 35 is L1 [mm]. The length in the first direction between the first end 22 of the label 20 and the first starting point 31 is L2 [mm]. Also, the adhesive force of the adhesive layer 26 is W. label Let it be [N / mm].

[0046] The adhesive strength W of the adhesive layer 26. label The peel-off adhesive strength shall be measured according to the test method for peel-off adhesive strength specified in JIS Z0237. Specifically, the label to be tested is attached to a test plate, and the edge of the label is grasped and peeled off. The peel load is measured with a load cell. As shown in Figure 6, when the label 20 peels off due to internal stress, the angle θ at which the adhesive layer 26 is peeled off varies depending on the shape of the surface of the adherend 100. The angle θ is the angle corresponding to the height position of the surface between the part where the edge of the label 20 including the first end 22 adheres and the part where the edge of the label 20 including the second end 23 adheres, and is less than 90 degrees.

[0047] When the portion between the first end 22 of the label 20 and the specific position 35 is peeled off from the adherent body 100, the direction connecting the first end 22 and the specific position 35 is defined as the direction D1. The direction parallel to the surface of the adherent body 100 at the portion when the portion between the first end 22 of the label 20 and the specific position 35 is peeled off from the adherent body 100 is defined as the direction D2. The angle θ is the angle formed by the direction D2 with respect to the direction D1.

[0048] The test method for peel adhesion force defined in JIS Z0237 is a test method of peeling the label at 90 degrees or 180 degrees. Therefore, in this embodiment, for example, a load cell capable of peeling the label at an arbitrary angle is used to measure the peel load of the adhesive layer 26. Or, for example, the peel load of the adhesive layer 26 is estimated from the measurement results of a load cell capable of peeling the label at a specific angle such as 45 degrees, 90 degrees, 180 degrees, etc.

[0049] Therefore, based on the measurement result of the load cell or the estimation result based on the measurement result, the average value of the peel load of the adhesive layer 26 at the angle θ is obtained. The average value of the peel load is divided by the label width and multiplied by 10. As the adhesive force [N / mm] of the adhesive layer, the load required to peel a label with a label width of 10 mm per millimeter is obtained.

[0050] As shown in FIG. 5, the cross-section of the label 20 at the first starting portion 31 is referred to as the starting cross-section 311. The total length in the second direction of the starting cross-section 311 orthogonal to the first direction of the label 20 is designated as B1 [mm]. When the first starting portion 31 is a slit row in which four slits are arranged, the starting cross-section 311 is divided into five cross-sections. The length in the second direction of each of the five starting cross-sections 311 is B A , B B , B C , B D , B E If we set it as such, B1 = B A + B B + B C + B D + B E 5]]It is given by.

[0051] Furthermore, the sum of the lengths in the third direction of the starting cross section 311 is defined as H1 [mm]. Then, the tensile strength of the label 20 is defined as σ max [N / mm 2 ] In this case, label 20 is,

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[0052] The following explains equation (1). Section modulus Z[m] at the first starting point 31 3 ] is given by the well-known equation (4).

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[0053] As shown in Figure 6, the adhesive force W of the adhesive layer 26 of the pressing portion 36 label Next, let's consider the case where the floating portion 37 is bent. The pressing portion 36 refers to the part from the first end 22 to the first starting point portion 31. The floating portion 37 refers to the part from the first starting point portion 31 to a specific position 35. The state in which the floating portion 37 is bent along the surface of the object to be adhered 100 is shown by the dotted line in Figure 6.

[0054] The fixing portion 38 remains attached to the object 100 due to the adhesive force of the adhesive layer 26 in that portion. The fixing portion 38 refers to the portion from the specific position 35 to the second end 23. In this state, the label 20, with the deflection of the floating portion 37 restored, is considered as a cantilever beam. A cantilever beam is a state in which one end is fixed and the other end is not fixed. Since we consider the deflection of the floating portion 37 by considering the label 20 as a cantilever beam, the adhesive layer 26 of the floating portion 37 is considered to be nonexistent.

[0055] The load applied to the first starting point 31 is the adhesive force W of the adhesive layer 26 of the pressing portion 36. label The value W obtained by multiplying by length L2. label ·L2. The first starting point 31 is W label To cause the body to bend due to L2, determine the maximum bending moment M [N·mm].

[0056] W label The maximum bending moment M when L2 is applied as a load is obtained by equation (5). M=W label ·L2(L1-L2) ···(5) L1-L2 is the length of the floating portion 37 in the first direction.

[0057] Furthermore, the maximum bending stress σ is given by the known equation (6). σ = M / Z ... (6)

[0058] Substituting equations (4) and (5) into equation (6) and rearranging, we obtain equation (7).

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[0059] When the deflection of the floating portion 37, which has been bent by the pressing portion 36, returns to its original position due to the reaction force, the first starting point portion 31 is designed to bend. To achieve this, the tensile strength σ of the label 20 is max It is sufficient that the tensile strength σ is smaller than the maximum bending stress σ. max As equation (1) is satisfied, the label 20 is reliably bent at the first starting point 31. Therefore, the label 20 attached to the adherend 100 is prevented from peeling off.

[0060] Next, even if the first starting point portion 31 bends, the pressing portion 36 is pulled by the reaction force of the floating portion 37. Therefore, in this embodiment, the adhesive force W of the adhesive layer 26 in the pressing portion 36 label This is defined by equation (2).

[0061] The algebra relating to equation (2) is defined below. Let B [mm] be the length of label 20 in the second direction. Let H [mm] be the length of label 20 in the third direction. Let E [N / mm] be the Young's modulus of label 20. 2 ]

[0062] Furthermore, the pressing portion 36 is not attached to the object 100. In this state, the distance between the surface of the object 100 and the first starting portion 31 in the third direction is X1 [mm]. In this case, the label 20 is,

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[0063] The following explains equation (2). When a load P0 [N] is applied to the tip of a cantilever beam and the tip deflects by δ0 [mm], the deflection δ0 is given by the well-known equation (8).

[0064]

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[0065] When the transverse length of the cross-section of a cantilever beam is b [mm] and the vertical length is h [mm], the second moment of area I0 is given by the known equation (9).

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[0066] Substituting equation (9) into equation (8) and rearranging for load P0, we obtain equation (10).

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[0067] Here, the cantilever beam is replaced with label 20. The length of the floating portion 37 in the first direction is (L1-L2), which corresponds to the length L0 of the cantilever beam. When the floating portion 37 is deflected until the first starting point 31 contacts the adherend 100, the length X1 by which the first starting point 31 moves in the third direction corresponds to the deflection δ0 of the cantilever beam. The Young's modulus E of label 20 corresponds to the Young's modulus E0 of the cantilever beam.

[0068] The length B in the second direction and the length H in the third direction of label 20 correspond to the lateral length b and the vertical length h of the cross-section of the cantilever beam, respectively. If P1 [N] is the load required to maintain the state in which the floating portion 37 is deflected along the surface of the adherend 100, then equation (11) is obtained.

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[0069] The floating portion 37 and the pressing portion 36 are connected at the first starting point portion 31. The pressing portion 36 has an adhesive strength W of the adhesive layer 26. label This maintains the state of adhesion to the adherend 100. In other words, the floating portion 37 has the adhesive force W of the adhesive layer 26 of the pressing portion 36 at the first starting point portion 31. label The value W obtained by multiplying by length L2. label L2 is applied as load P1. Therefore, W label If L2 is greater than or equal to the load P1, the pressing portion 36 can maintain a state in which the floating portion 37 is bent along the surface of the object to be attached 100. That is, W label Let's organize the information and discuss the adhesive strength W. label The fact that equation (2) is satisfied suppresses the peeling of the label 20 attached to the substrate 100.

[0070] Furthermore, the pressing portion 36 maintains its adhesive state to the adherend 100 by the adhesive layer 26. In the pressing portion 36 as well, a reaction force acts due to internal stress to return it to its original state. Therefore, in this embodiment, the adhesive force W of the adhesive layer 26 of the pressing portion 36 label This is further defined by equation (3).

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[0071] The following explains equation (3). Assuming that the floating portion 37 and the fixed portion 38 are fixed together, the pressing portion 36 is considered a cantilever beam. The state of the pressing portion 36 in this condition is shown by the dashed line in Figure 6.

[0072] When a uniformly distributed load W0 [N / mm] is applied to the entire length L0 of a cantilever beam, and the tip deflects by δ1 [mm], the deflection δ1 is given by the known equation (12).

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[0073] Substituting equation (9) into equation (12) and rearranging for the uniformly distributed load W0, we obtain equation (13).

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[0074] Here, the cantilever beam is replaced with label 20. The length of the clamping portion 36 in the first direction is L2, which corresponds to the length L0 of the cantilever beam. When the clamping portion 36 is bent, the length X2 by which the first end 22 moves in the third direction corresponds to the deflection δ1 of the cantilever beam. The Young's modulus E of label 20 corresponds to the Young's modulus E0 of the cantilever beam.

[0075] The length B in the second direction and the length H in the third direction of label 20 correspond to the horizontal length b and vertical length h of the cross-section of the cantilever beam, respectively. If W1 [N / mm] is the uniformly distributed load required to maintain the state in which the pressing portion 36 is deflected along the surface of the adherend 100, then equation (14) is obtained.

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[0076] Adhesive strength W of adhesive layer 26 label If the uniformly distributed load W1 is greater than or equal to the adhesive load, the pressing portion 36 can maintain a state of bending along the surface of the adherend 100 by the adhesive layer 26. That is, adhesive force W label The fact that equation (3) is satisfied suppresses the peeling of the label 20 attached to the substrate 100.

[0077] As explained above, there are adherends 100 with curved surfaces, where the surface height differs between the part to which one end of the label 20 adheres and the part to which the other end adheres. When the label 20 is attached to such an adherend 100, the intermediate part between the two ends of the label 20 is bent, and the adhesive layer 26 adheres to the adherend 100. In order to eliminate the bending of the intermediate part, a reaction force of internal stress is applied to the adhesive layer 26.

[0078] If equation (1) is satisfied, the tensile strength of the label 20 is less than the stress applied to the first starting point 31, so the label 20 bends at the first starting point 31. When the label 20 bends, the direction of the stress applied to the adhesive layer 26 between the first starting point 31 and the first end 22 changes to a direction along the surface of the adherend 100. As a result, the stress required to peel the portion between the first starting point 31 and the first end 22 from the adherend 100 increases, making the label 20 difficult to peel off. Thus, a label sheet 1 is provided in which a label 20 that is less likely to lift in the adhesive layer 26 and is difficult to peel off is attached to the backing paper 10.

[0079] The adhesive layer 26 of the pressing portion 36 can ensure the adhesive force necessary to bend the floating portion 37 by satisfying equation (2). The required adhesive force is an adhesive force greater than or equal to the load required to bend the floating portion 37 of the label 20, which is folded at the first starting point portion 31, by X1 mm. Thus, a label sheet 1 is provided in which a label 20 that is less prone to lifting and peeling is attached to the backing paper 10.

[0080] The adhesive layer 26 of the pressing portion 36 satisfies equation (3), thereby ensuring the necessary adhesive force to maintain adhesion to the adherend 100 by bending the pressing portion 36. The necessary adhesive force is an adhesive force greater than or equal to the load required to bend the pressing portion 36 by X2 mm. Thus, a label sheet 1 is provided in which a label 20 that is less prone to lifting and peeling is attached to the backing paper 10.

[0081] The label 20 has a first starting point 31 between the first end 22 and the center 24 in the first direction, and a second starting point 32 between the second end 23 and the center 24. Therefore, even when the label 20 is attached to an adherend 100 having a curved surface, lifting is less likely to occur at the ends of the label 20 including the first end 22, and also less likely to occur at the ends of the label including the second end 23. Thus, a label sheet 1 is provided in which a label 20 that is less likely to lift and less likely to peel off the adhesive layer 26 is attached to a backing sheet 10.

[0082] In the above description, the adherend 100 is an example of an adherend of the present invention. The adhesive layer 26 is an example of an adhesive layer of the present invention. The label 20 is an example of a label of the present invention. The backing paper 10 is an example of a backing paper of the present invention. The label sheet 1 is an example of a label medium of the present invention.

[0083] The first end 22 is an example of the first end of the present invention. The second end 23 is an example of the second end of the present invention. The center 24 is an example of the center of the present invention. The first starting point 31 is an example of the first starting point of the present invention. The first surface 20A and the second surface 20B are examples of the surfaces of the label of the present invention.

[0084] The specific position 35 is an example of a specific position in the present invention. The starting cross section 311 is an example of a starting cross section in the present invention.

[0085] The present invention is not limited to the above embodiments and can be modified in various ways. In a first modified example of the present invention, as shown in Figure 7, the starting points may be located not only at both ends in the first direction but also at both ends in the second direction. The label 120 has a first starting point 131, a second starting point 132, a third starting point 133, and a fourth starting point 134.

[0086] The first starting point 131 is located between the first end 122 and the center 124 of the label 120 in the first direction. The first end 122 is one end of the label 120 in the first direction. The second starting point 132 is located between the second end 123 and the center 124 of the label 120 in the first direction. The second end 123 is the other end of the label 120 in the first direction.

[0087] The third starting point 133 is located between the third end 127 and the center 124 of the label 120 in the second direction. The third end 127 is one end of the label 120 in the second direction. The fourth starting point 134 is located between the fourth end 128 and the center 124 of the label 120 in the second direction. The fourth end 128 is the other end of the label 120 in the second direction.

[0088] The first starting point 131 and the second starting point 132 are perforations consisting of rows of slits that penetrate the label 20 in a third direction and extend in a second direction, with multiple slits arranged in the second direction. The third starting point 133 and the fourth starting point 134 are perforations consisting of rows of slits that penetrate the label 20 in a third direction and extend in a first direction, with multiple slits arranged in the first direction.

[0089] In the first modified example, the third end 127 is an example of the third end of the present invention. The fourth end 128 is an example of the fourth end of the present invention.

[0090] The first starting point 131 and the second starting point 132 are not limited to perforations, but may also be a single slit extending in the second direction. The third starting point 133 and the fourth starting point 134 are not limited to perforations, but may also be a single slit extending in the first direction. Alternatively, the first starting point 131 and the second starting point 132 may be folds that are recessed in the third direction and extend in the second direction on the first side 120A or the second side 120B or both of the label 120. The third starting point 133 and the fourth starting point 134 may be folds that are recessed in the third direction and extend in the first direction on the first side 120A or the second side 120B or both of the label 120.

[0091] The first starting point 31 and the second starting point 32 in this embodiment, and the first starting point 131 and the second starting point 132 in the first modified example, may each be located at multiple locations in the second direction. The third starting point 133 and the fourth starting point 134 may each be located at multiple locations in the first direction.

[0092] In a second modification of the present invention, as shown in Figure 8, the label 220 may have a non-adhesive area 228. The non-adhesive area 228 is an area that does not have an adhesive function. The adhesive function is the function of being able to stick to the object to which it is attached. That is, the label 220 cannot stick to the object to which it is attached in the non-adhesive area 228. The non-adhesive area 228 is located between a first starting point 231 which is closer to the first end 322 than the center 224 in the first direction, and a second starting point 232 which is closer to the second end 323 than the center 224.

[0093] If there is no adhesive layer 226 in the non-adhesive area 228 of the first side 220A of the label 220, the label 20 cannot adhere to the object to which it is applied and does not have an adhesive function. Also, even if there is an adhesive layer 226 in the non-adhesive area 228, if the adhesion of the adhesive layer 226 to the object to which it is applied is inhibited, the label 220 does not have an adhesive function. An example of a state in which adhesion is inhibited is when the adhesive layer 226 has been processed to eliminate its adhesiveness, for example, by applying varnish or attaching a film to it. Furthermore, when peeling the label 220 from the backing paper 10, if a part of the backing paper 10 is not peeled off and remains attached to the adhesive layer 226, the remaining part of the backing paper 10 can be made to have no adhesive function. In the second modified example, the label 220 has an adhesive layer 226 in the part that has an adhesive function, and no adhesive layer 226 in the part that does not have an adhesive function.

[0094] The non-adhesive area 228 of the label 220 does not have an adhesive layer 226. Therefore, when applying the label 220, the worker is made aware of pressing one end, including the first end 222, and the other end, including the second end 223, against the substrate 100. Thus, the worker is encouraged to apply the label 220 while pressing the end including the first end 222 and the end including the second end 223 against the substrate 100. As a result, a label sheet 1 is provided in which the adhesive layer 26 is less likely to lift and the label 20 is less likely to peel off, and the label 20 is attached to the backing paper 10. Note that the non-adhesive area 228 is an example of a non-adhesive area in the present invention.

[0095] In a third modified example of the present invention, as shown in Figure 9, the label 320 may have a weak adhesive region 327. The weak adhesive region 327 is an adhesive layer with weaker adhesive strength compared to the adhesive layer 326 on the first surface 320A of the label 320. The weak adhesive region 327 is located between a first starting point 231, which is closer to the first end 322 than the center 324, and a second starting point 232, which is closer to the second end 323 than the center 324, in the first direction. Note that the weak adhesive region 327 is an example of a weak adhesive region in the present invention.

[0096] The weakly adhesive area 327 of the label 320 has weaker adhesive strength than the adhesive layer 326. The worker temporarily attaches the weakly adhesive area 327 to the substrate 100. Then the worker presses one end, including the first end 322 which has stronger adhesive strength than the weakly adhesive area 327, and the other end, including the second end 323, against the substrate 100. At this time, the worker attaches the label 320 to the substrate 100 while correcting the orientation of the label 320.

[0097] Other variations are described below. The adhesive layer 26 covers the entire surface of the first surface 20A of the label 20, but may be present only partially. The first starting point 31 is located between the first end 22 and the center 24, but is preferably closer to the first end 22 than to the center 24. The second starting point 32 is located between the second end 23 and the center 24, but is preferably closer to the second end 23 than to the center 24.

[0098] The printing layer 21 of the label 20 is not limited to thermal paper; it may also be a paper material or film on which characters, etc., are printed using an ink ribbon. Alternatively, the label 20 may be printed on a transparent film, with double-sided tape attached to the printed surface so that the printed surface is protected by the film.

[0099] The label sheet 1 may be wound with the backing paper 10 positioned on the inner circumference of the label 20. In this case, the label 20 will have a tendency to bend, with the second side 20B facing outward and the first side 20A curving inward. When this label 20 is attached to the adherend 100, the label 20 will be more likely to maintain a shape that conforms to the surface of the adherend 100 due to its tendency to bend. In other words, the label 20 will be more likely to maintain a bent state without being subjected to external stress. Therefore, the label sheet 1 that can provide such a label 20 will further suppress the peeling of the label 20 from the adherend 100.

[0100] The label sheet 1 is provided with multiple labels 20 already attached to the backing paper 10 by pre-cutting the sheet using the notches 29. However, the labels 20 may be created by cutting the label sheet 1 to the appropriate length each time printing is required. Alternatively, the label sheet 1 is not limited to a roll but may be a single sheet. The labels 20 are arranged in the first direction along the shorter side of the label sheet 1, but they may also be arranged along the longer side.

[0101] A spits tube was given as an example of the adherend 100, but it is not limited to this. The configuration of the label 20 is effective when the adhesive surface is not flat, and the adhesive position of the end including the first end 22 and the adhesive position of the end including the second end 23 are different in a third direction. [Explanation of Symbols]

[0102] 1 Label sheet 10 mounting boards 20,120,220,320 labels 20A,120A,220A,320A 1st side 20B,120B 2nd side 22,122,222,322 1st end 23,123,223,323 2nd end 24,124,224,324 center 26,126,226,326 Adhesive layer 31,131,231,331 1st starting point 32,132, 232,332 Second starting point 35 Specific locations 100 were covered 127 Third End 128 End 4 133 Part 3 134 Part 4 228 Non-adhesive domain 311 Starting Section 327 Weakly Adhesive Domain

Claims

1. A label medium comprising a label having an adhesive layer for attaching to a substrate, and a backing sheet to which the label is attached via the adhesive layer, The label, when not attached to the adherend, extends in a first direction and a second direction intersecting the first direction. The first end, which is one end in the first direction, The second end, which is the other end in the first direction, A first starting point portion is located between the center and the first end of the label in the first direction, and serves as the starting point when the label bends in a third direction that intersects the first and second directions. It has, The first starting point is, A slit extending in the second direction while penetrating the label in the third direction, with portions of the label connected in the first direction located at both ends. Or a row of slits arranged in the second direction, Alternatively, a fold on the surface of the label that is recessed in the third direction and extends in the second direction. And is arranged at one or more locations in the first direction, The tensile strength of the aforementioned label is σ ｍａｘ [N / mm ２ ], The adhesive force of the aforementioned adhesive layer is W ｌａｂｅｌ [N / mm] In the first direction, the portion from a specific position between the first starting point and the second end to the second end is attached to the adherend via the adhesive layer, and the portion from the specific position to the first end is not attached to the adherend. In this state, the length of the label between the first end and the specific position in the first direction is L. １ [mm] The length between the first end and the first starting point of the label in the first direction is L. ２ [mm] Of the cross-sections of the label perpendicular to the first direction, the sum of the lengths in the second direction of the starting cross-section, which is the cross-section at the first starting point, is B １ [mm] The sum of the lengths in the third direction of the starting cross section is H １ [mm] In that case, The aforementioned label is, [Math 1] Satisfying the conditions A label medium characterized by the following.

2. The Young's modulus of the aforementioned label is E [N / mm] ２ ], Let the length of the label in the second direction be B [mm]. Let H [mm] be the length of the label in the third direction. In a state where the portion from the specific position to the second end is attached to the adherend through the adhesive layer and the portion from the specific position to the first end is not attached to the adherend, the length X by which the surface of the adherend and the first starting point portion are separated in the third direction １ [mm] In that case, The aforementioned label is, [Math 2] Satisfying the conditions A label medium according to claim 1, characterized by the following:

3. When the portion from the first starting point to the second end is attached to the adherend via the adhesive layer, and the portion from the first starting point to the first end is not attached to the adherend, the distance between the surface of the adherend and the first end in the third direction is X. ２ [mm] In that case, The aforementioned label is, [Math 3] Satisfying the conditions The label medium according to claim 2, characterized by the following:

4. The aforementioned label is, The label further has a second starting point located between the center and the second end of the label in the first direction, which serves as the starting point when the label bends in the third direction. The second starting point is, A slit extending in the second direction while penetrating the label in the third direction, with portions of the label connected in the first direction located at both ends. Or a row of slits arranged in the second direction, Alternatively, a fold on the surface of the label that is recessed in the third direction and extends in the second direction. and is arranged at one or more locations in the first direction. A label medium according to any one of claims 1 to 3, characterized by the following:

5. The aforementioned label is, The third end, which is one end in the second direction, The fourth end, which is the other end in the second direction, A third starting point portion is located between the center of the label and the third end in the second direction, and serves as the starting point when the label bends in the third direction. A fourth starting point portion is located between the center of the label in the second direction and the fourth end, and serves as the starting point when the label bends in the third direction. It further possesses, The third starting point and the fourth starting point are, A slit extending in the first direction while penetrating the label in the third direction, with portions of the label connected in the first direction located at both ends. Or a row of slits arranged in the first direction, Alternatively, a fold on the surface of the label that is recessed in the third direction and extends in the first direction. and each is arranged at one or more locations in the second direction. A label medium according to claim 4, characterized by the following:

6. The adhesive layer of the label is In the first direction, there is a non-adhesive region between the first starting point and the second starting point. The non-adhesive region is a region that does not have an adhesive function to the adherend. A label medium according to claim 4, characterized by the following:

7. The adhesive layer of the label is In the first direction, there is a weakly adhesive region between the first starting point and the second starting point. The weakly adhesive region is a region in which the adhesive force to the adherend is weaker than that of other regions of the adhesive layer. A label medium according to claim 4, characterized by the following:

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