Apparatus for evaluating sheet adhesion and method for evaluating sheet adhesion

Abstract

The present invention provides a sheet adhesion evaluation device and a sheet adhesion evaluation method that can suppress variations in the evaluation results of adhesion properties. [Solution] The sheet adhesion evaluation device EA is a device for evaluating the adhesion of a sheet AS having adhesive or bonding properties, and comprises a support means 10 that supports the sheet AS on a support surface 11 provided with a recess 12, a pressing means 20 that presses the sheet AS attached to the support surface 11 against the inner surface 13 of the recess 12 with a pressing member 22 to adhere it, and a detection means 30 that detects the reaction force of the sheet AS against the pressing member 22 when the pressing of the sheet AS by the pressing member 22 is released.

Description

Technical Field

[0001] The present invention relates to a sheet adhesion evaluation apparatus and a sheet adhesion evaluation method.

Background Art

[0002] A method for evaluating the adhesion of a sheet is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the evaluation of adhesion described in Patent Document 1, an adhesive sheet (sheet) is attached to a concave surface, and a person visually checks the lifting of the sheet from the concave surface. Therefore, variations occur in the evaluation results of the adhesion of the sheet.

[0005] An object of the present invention is to provide a sheet adhesion evaluation apparatus and a sheet adhesion evaluation method capable of suppressing variations in the evaluation results of adhesion.

Means for Solving the Problems

[0006] A sheet adhesion evaluation apparatus according to an aspect of the present invention is a sheet adhesion evaluation apparatus for evaluating the adhesion of a sheet having adhesiveness or adhesivity, and includes a support means for supporting the sheet on a support surface provided with a concave portion, a pressing means for pressing and attaching the sheet attached to the support surface to the inner surface of the concave portion with a pressing member, and a detection means for detecting a reaction force of the sheet against the pressing member when the pressing of the sheet by the pressing member is released.

[0007] In one aspect of the present invention, a sheet adhesion evaluation device may be configured to allow the selective use of a plurality of support means with different recess shapes.

[0008] In a sheet adhesion evaluation device according to one aspect of the present invention, the pressing means may have a variable moving speed of the pressing member when pressing the sheet against the inner surface of the recess or when releasing the pressure on the sheet.

[0009] A sheet adhesion evaluation method according to one aspect of the present invention is a sheet adhesion evaluation method for evaluating the adhesion of a sheet having adhesive or bonding properties, comprising: a support step of supporting the sheet on a support surface provided with a recess; a pressing step of pressing the sheet attached to the support surface against the inner surface of the recess with a pressing member to adhere it; and a detection step of detecting the reaction force of the sheet against the pressing member when the pressing of the sheet by the pressing member is released. [Effects of the Invention]

[0010] According to the present invention, a sheet attached to a support surface is pressed against the inner surface of a recess with a pressing member to secure it, and when the pressure on the sheet by the pressing member is released, the reaction force of the sheet against the pressing member is detected, thereby suppressing variability in the evaluation results of the adhesiveness. [Brief explanation of the drawing]

[0011] [Figure 1] An explanatory diagram of a sheet adhesion evaluation device according to an embodiment of the present invention. [Figure 2] Operational diagram of the sheet adhesion evaluation device. [Figure 3] A diagram showing the relationship between the position of the pressing member and the load. [Figure 4] An explanatory diagram of a sheet adhesion evaluation device according to a modified version of the present invention. [Modes for carrying out the invention]

[0012] One embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the X, Y, and Z axes are orthogonal to each other. The X and Y axes are axes within a predetermined plane, and the Z axis is an axis perpendicular to the predetermined plane. Furthermore, in this embodiment, when directions are indicated based on a view from the front direction in Figure 1, which is parallel to the Y axis, "up" is the direction of the Z-axis arrow and "down" is the opposite direction, "left" is the direction of the X-axis arrow and "right" is the opposite direction, and "front" is the direction of the Y-axis arrow and "back" is the opposite direction.

[0013] In Figure 1, the sheet adhesion evaluation device EA is a device for evaluating the adhesion of a sheet AS having adhesive or bonding properties, and comprises a support means 10 that performs a support step of supporting the sheet AS on a support surface 11 provided with a recess 12, a pressing means 20 that performs a pressing step of pressing the sheet AS attached to the support surface 11 against the inner surface 13 of the recess 12 with a pressing member 22 to adhere it, and a detection means 30 that performs a detection step of detecting the reaction force of the sheet AS against the pressing member 22 when the pressing of the sheet AS by the pressing member 22 is released, such as a load cell or pressure sensor.

[0014] The support means 10 comprises a support surface 11 that supports the sheet AS and a recess 12 provided on the support surface 11, with the upper surface of the support surface 11 being formed in a recessed shape by the recess 12. The recess 12 has a semicircular inner surface 13 in cross-sectional view that extends in the front-to-back direction, with both ends open in the front-to-back direction.

[0015] The pressing means 20 includes a linear motor 21 as a drive device and a pressing member 22 supported on the output shaft 21A of the linear motor 21 via a detection means 30. The pressing member 22 includes a first pressing surface 23 facing the support surface 11 of the support means 10, and a second pressing surface 24 protruding from the first pressing surface 23 and facing the inner surface 13 of the recess 12. The first pressing surface 23 is provided parallel to the support surface 11 and sandwiches the sheet AS between itself and the support surface 11. The second pressing surface 24 has a semicircular cross-section and extends in the front-rear direction, sandwiching the sheet AS between itself and the inner surface 13 of the recess 12.

[0016] The detection means 30 detects an upward load applied by the pressing member 22 to the detection means 30 as a reaction force of the sheet AS against the pressing member 22.

[0017] The operation of the above sheet adhesion evaluation apparatus EA will be described. First, for the sheet adhesion evaluation apparatus EA in which each member is arranged at the initial position shown by the solid line in FIG. 1, a user of the sheet adhesion evaluation apparatus EA (hereinafter simply referred to as "user"), or conveying means not shown such as an articulated robot or a belt conveyor, places the sheet AS on the support surface 11 and attaches the sheet AS to the support surface 11 as shown in FIG. 1. Next, the pressing means 20 drives the linear motion motor 21, and as shown in FIG. 2, the pressing member 22 is lowered to push the sheet AS into the concave portion 12, and the sheet AS is pressed against the inner surface 13 of the concave portion 12 by the pressing member 22 for attachment. Then, until the pressing member 22 reaches the lowest point, the load acting on the detection means 30 is detected by the detection means 30. In a state where the pressing member 22 has reached the lowest point, the portion of the sheet AS that has been previously attached to the support surface 11 is pressed by the first pressing surface 23 and sandwiched between the support surface 11 and the first pressing surface 23.

[0018] Thereafter, when a predetermined time has elapsed while the pressing member 22 is pressing the sheet AS against the inner surface 13 of the concave portion 12, the pressing means 20 drives the linear motion motor 21 and raises the pressing member 22 as shown in FIG. 2. Then, until the pressing member 22 reaches the initial position, the load acting on the detection means 30 is detected by the detection means 30. Next, the user or the conveying means not shown peels the sheet AS from the support surface 11 and conveys it to a recovery means such as a box or a bag, and thereafter the same operation as above is repeated.

[0019] Here, the better the adhesion of the sheet AS, the less likely it is to peel from the inner surface 13 of the concave portion 12 and the less likely it is to lift from the inner surface 13 of the concave portion 12. Therefore, when the pressing member 22 is raised, the load acting on the detection means 30 becomes smaller. For this reason, the adhesion of the sheet AS can be evaluated based on the load detected by the detection means 30.

[0020] FIG. 3(A) and (B) are diagrams plotting the relationship between the load detected by the detection means 30 when evaluating different samples S1 to S3 of the sheet AS and the position of the pressing member 22 when that load was detected. FIG. 3(A) shows the situation when the pressing member 22 is lowered and the sheet AS is pushed into the recess 12, and FIG. 3(B) shows the situation when the pressing member 22 is raised. The position [mm] shown on the horizontal axis in FIGS. 3(A) and (B) is the position of the lower edge of the pressing member 22, and the position of the lower edge of the pressing member 22 when the pressing member 22 is in the initial position is zero. Also, the distance from the lower edge of the pressing member 22 to the support surface 11 when the pressing member 22 is in the initial position is approximately 62 [mm].

[0021] As shown in FIG. 3(A), for sample S1, the load until the pressing member 22 reaches the lowest point is larger and the rigidity is higher compared to samples S2 and S3. However, as shown in FIG. 3(B), the load when raising the pressing member 22 is smaller compared to samples S2 and S3, and the adhesiveness is good.

[0022] In contrast, for sample S2, as shown in FIG. 3(A), the load until the pressing member 22 reaches the lowest point is smaller and the rigidity is lower compared to samples S1 and S3. However, as shown in FIG. 3(B), the load when raising the pressing member 22 is larger compared to sample S1. For sample S3, as shown in FIG. 3(A), the load until the pressing member 22 reaches the lowest point is between that of samples S1 and S3. However, as shown in FIG. 3(B), the load when raising the pressing member 22 is larger compared to samples S1 and S2, and it has the lowest adhesiveness among the three.

[0023] According to the above-described embodiment, the sheet AS attached to the support surface 11 is pressed and attached to the inner surface 13 of the recess 12 by the pressing member 22. When the pressing of the sheet AS by the pressing member 22 is released, the reaction force of the sheet AS against the pressing member 22 is detected, so that variations in the evaluation results of the adhesiveness can be suppressed.

[0024] Furthermore, since the load when the pressing member 22 is lowered to push the sheet AS into the recess 12 is also detected, in addition to the evaluation results of the adhesiveness of the sheet AS, the relationship between the rigidity of the sheet AS and its base material and the adhesiveness of the sheet AS can be obtained.

[0025] As described above, the best configurations, methods, etc., for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, although the present invention is mainly illustrated and described in relation to specific embodiments, those skilled in the art can make various modifications to the embodiments described above in terms of shape, material, quantity, and other detailed configurations without departing from the scope of the technical idea and objectives of the present invention. Furthermore, the descriptions of shapes, materials, etc. disclosed above are illustrative to facilitate understanding of the present invention and do not limit the present invention, so descriptions of components with some or all of those limitations removed are included in the present invention. Furthermore, the means and processes in the present invention are not limited in any way as long as they can perform the operations, functions, or processes described for those means and processes, and are certainly not limited at all to the components or processes of a single embodiment shown above. For example, the support means can be anything that supports the sheet on a support surface provided with a recess, and is not limited in any way as long as it is within the scope of the common technical knowledge at the time of filing (the same applies to other means and processes).

[0026] The shape of the recess 12 of the support means 10 is not particularly limited. For example, as shown in Figure 4(A), it may have a recess 12A with an inner surface 13A that is roughly rectangular in cross-section and extends in the front-rear direction, or as shown in Figure 4(B), it may have a recess 12B with an inner surface 13B that is roughly triangular in cross-section and extends in the front-rear direction, or it may have a circular, elliptical, triangular, quadrilateral or other polygonal shape in plan view. The support means 10 may have a plurality of recesses 12, for example, one or more of the recesses 12, 12A, and 12B may be arranged parallel to each other, or they may be arranged to intersect each other.

[0027] The pressing means 20 only needs to have a pressing surface 24 of the pressing member 22 whose shape corresponds to the shape of the inner surface 13 of the recess 12. For example, it may include a pressing member 22A having a second pressing surface 24A of the shape shown in Figure 4(A), or a pressing member 22B having a second pressing surface 24B of the shape shown in Figure 4(B). The pressing means 20 may have a variable moving speed for the pressing member 22 when pressing the sheet AS against the inner surfaces 13, 13A, 13B of the recesses 12, 12A, 12B, or when releasing the pressure on the sheet AS. For example, the pressing means 20 may move the pressing member 22 at the same speed when it is descending and when it is ascending, or it may move the pressing member 22 at different speeds when it is descending and when it is ascending, or it may change the moving speed of the pressing member 22 while it is descending or ascending, or it may change the moving speed of the pressing member 22 according to the shape of the recesses 12, 12A, 12B of the support means 10, or the characteristics of the sheet AS such as the material, type, and shape. By making the moving speed of the pressing member 22 variable in this way, in addition to evaluating the adhesiveness of the sheet AS, it is possible to evaluate the characteristics of the sheet AS and its base material and to use this information for selecting the base material.

[0028] The detection means 30 does not necessarily have to be interposed between the output shaft 21A of the linear motor 21 and the pressing member 22. For example, it may be positioned to contact the sheet AS within recesses provided on the second pressing surfaces 24, 24A, and 24B of the pressing members 22, 22A, and 22B.

[0029] As shown in Figures 1 and 4(A) and (B), the sheet adhesion evaluation device EA may be configured to allow the selective use of multiple support means 10 with different shapes of recesses 12, 12A, and 12B. The sheet adhesion evaluation device EA may include heating means such as a coil heater or the heating side of a heat pipe for heating the sheet AS, and cooling means such as a Peltier element or the cooling side of a heat pipe for cooling the sheet AS. In this case, the heating means and cooling means may be provided within the support means 10, provided within the pressing member 22, or configured as separate components independent of the support means 10 and the pressing member 22. The heating means may heat the sheet AS by blowing heated gas onto the sheet AS. The cooling means may cool the sheet AS by blowing cooled gas onto the sheet AS.

[0030] The material, type, shape, etc. of the sheet AS in the present invention are not particularly limited. For example, the sheet AS may be circular, elliptical, polygonal such as a triangle or square, or other shapes, and may have adhesive properties such as pressure-sensitive adhesive or heat-sensitive adhesive. If a heat-sensitive adhesive sheet AS is used, it may be bonded by an appropriate method, such as providing a suitable heating means such as a suitable coil heater or the heating side of a heat pipe to heat the sheet AS. Furthermore, such a sheet AS may be any type, such as a single layer consisting only of an adhesive layer or bonding layer, a two-layer sheet in which a base material and an adhesive layer or bonding layer are laminated, a three-layer or three-or-more-layer sheet in which one or more intermediate layers are laminated between the base material and the adhesive layer or bonding layer, a three-layer or three-or-more-layer sheet in which one or more cover layers are laminated on the upper surface of the base material, a sheet in which the base material, intermediate layer or cover layer is peelably provided, a single-layer double-sided adhesive sheet or double-sided bonding sheet consisting only of an adhesive layer or bonding layer, a double-sided adhesive sheet or double-sided bonding sheet in which an adhesive layer or bonding layer is laminated on both outermost surfaces of one or more intermediate layers, etc. The sheet AS may be any sheet such as an information label, decorative label, protective sheet, dicing tape, die attach film, die bonding tape, recording layer forming resin sheet, film such as vehicle marking film, tape, etc.

[0031] The drive equipment in the above embodiment may be electric motors such as rotary motors, linear motors, single-axis robots, and so-called articulated robots with two or three or more joints, or actuators such as air cylinders, hydraulic cylinders, rodless cylinders, and rotary cylinders, either individually or in combination directly or indirectly. Furthermore, the drive equipment may be capable of or incapable of torque control or speed control of the output section of the electric motors or actuators.

[0032] In the above embodiment, an object (hereinafter referred to as "object A") and an object moving relative to object A (hereinafter referred to as "object B"), that is, object A and object B moving relative to object A, may be such that object B moves relative to object A which does not move, or object A moves relative to object B which does not move, or both object A and object B may move, and either object A or object B may move as long as the result achieved by the movement is the same. If a means of pressing or a pressing member such as a pressing roller or pressing head is used to press the object to be pressed, rollers, round bars, blade materials, brush-like members may be used instead of or in combination with those exemplified above, and the pressing material may be made of a deformable material such as rubber, resin, or sponge, or a non-deformable part such as metal or glass. It may be constructed of materials, or if a support (holding) means or support (holding) member or other means for supporting (holding) the supported member (held member) is employed, a configuration may be adopted in which the supported member is supported (held) by gripping means such as mechanical chucks or chuck cylinders, Coulomb force, adhesive (adhesive sheet, adhesive tape), adhesive agent (adhesive sheet, adhesive tape), magnetic force, Bernoulli adsorption, suction adsorption, drive equipment, etc. If a cutting means or cutting member or other means for cutting the member to be cut or forming cuts or cutting lines in the member to be cut is employed, instead of or in combination with the examples above, a cutter blade, laser cutter, ion beam, thermal power, heat, water pressure, electric heating wire, spraying of gas or liquid, etc. may be employed, or the member to be cut may be moved by combining appropriate drive equipment to perform the cutting. [Explanation of Symbols]

[0033] EA…Sheet Adhesion Evaluation Device 10...Support means 11...Support surface 12…recess 20... means of pressing 22…Pressing member 30...Detection means AS...sheet

Claims

1. A sheet adhesion evaluation device for evaluating the adhesion properties of adhesive or bonding sheets, A support means for supporting the sheet on a support surface provided with a recess, A pressing means for pressing the sheet attached to the support surface against the inner surface of the recess with a pressing member to attach it, A sheet adhesion evaluation device characterized by comprising detection means for detecting the reaction force of the sheet against the pressing member when the pressing of the sheet by the pressing member is released.

2. The sheet adhesion evaluation device according to claim 1, characterized in that a plurality of support means with different recess shapes can be selectively used.

3. The sheet adhesion evaluation device according to claim 1 or 2, characterized in that the pressing means has a variable moving speed of the pressing member when pressing the sheet against the inner surface of the recess or when releasing the pressure on the sheet.

4. A method for evaluating the adhesiveness of a sheet having adhesive or bonding properties, A support step in which the sheet is supported on a support surface provided with a recess, A pressing step in which the sheet attached to the support surface is pressed against the inner surface of the recess with a pressing member to attach it, A method for evaluating the adhesion properties of a sheet, characterized by performing a detection step of detecting the reaction force of the sheet against the pressing member when the pressing of the sheet by the pressing member is released.

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