Separation test jig

Abstract

To provide a separation test jig which can run a separation test of easily separating a test film from a test body by using a general tensile test machine.SOLUTION: The present invention relates to a separation test jig for running a separation test by grasping an end of a test film 4 to separate from a test body 3 with a first grasping part 1 of grasping parts facing a tensile test machine, and the separation test jig includes: a holding unit 5 which a second grasping part 2 can grasp, the holding unit slidably holding the test body 3 at a predetermined angle with respect to the direction of separating the test film 4; and a regulation unit 10 arranged in contact with the test film 4 or close to the test film 4 on the test body 3 over the whole length of the width of separation of the test film 4 in a position which faces the first grasping part 1, the regulation unit regulating the position of a separation part of the test film 4 from the test body 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a peel test fixture, and more particularly to a peel test fixture for peeling a test film from a test body to perform a peel test, such as a peel adhesion strength test, of the test film. [Background technology]

[0002] Peel tests are conducted as a test method for measuring the adhesive strength (adhesive strength) of adhesive tapes and adhesive sheets, and the peel adhesion strength of adhesives, etc. Among these, peel test methods for adhesive tapes and adhesive sheets are specified, for example, in JIS Z 0237, and peel test methods for adhesives are specified, for example, in JIS K 6854-1 to 4. As a peel test device for carrying out such a peel test method, for example, there is one described in Patent Document 1 below.

[0003] This peel test apparatus is composed of a gripping member that grips one end of the test film to be peeled off from the test specimen, a movable member that moves linearly in the direction of approach and separation relative to the gripping member, a holding member that is arranged on the moving member so that it can move linearly in a direction along the peel surface of the test specimen while holding the test specimen, a moving mechanism that moves the moving member linearly, a load measuring device that measures the load applied to the gripping member, a first conversion mechanism that converts the linear motion of the moving member into rotational power and outputs it, and a second conversion mechanism that converts the rotational power output from the first conversion mechanism into linear motion of the holding member relative to the moving member.

[0004] According to this peel test device, when the moving member is moved away from the gripping member while one end of the test film is held by the gripping member, the test film is peeled off from the test piece held by the holding member, and the peel load at that time is measured by a load measuring device, and for example, peel adhesion strength is obtained. At this time, the first and second conversion mechanisms move the holding member in a direction along the peel surface of the test piece by an amount of movement equal to that of the moving member, so that the test piece can be moved in the peel surface direction in synchronization with the peeling of the test film, and thus peel tests of the test films can be performed continuously. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4717156 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the peel test device described in Patent Document 1 requires a mechanism for synchronizing the movement of the moving member, i.e., the peeling of the test film, and the movement of the holding member, i.e., the movement of the test specimen. In addition, since a load measuring device is required to measure the load applied to the gripping member, the structure is complicated and expensive. In other words, a device or tool that can easily perform a peel test to peel the test film from the test specimen using, for example, a general-purpose vertical tensile tester is desired.

[0007] The present invention has been made in consideration of the above problems, and its object is to provide a peel test fixture that can easily perform a peel test in which a test film is peeled off from a test piece using a general-purpose tensile testing machine. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, a peel test tool according to one embodiment of the present invention is a peel test tool for conducting a peel test by gripping one end of a test film to be peeled from a test specimen with one of opposing gripping parts of a tensile testing machine, and is characterized by comprising: a holding part that can be gripped by the other gripping part and holds the test specimen slidably at a predetermined angle with respect to the peel direction of the test film; and a regulating part that is positioned opposite one of the gripping parts and is arranged in close proximity to the test film on the test specimen or in contact with the test film over the entire length of the peel width of the test film, and that regulates the position of the peeled part of the test film from the test specimen. Effect of the Invention

[0009] According to the peel test fixture of the present invention, the test specimen held by the holding portion is moved at a predetermined angle, i.e., in the direction of the peel surface, as the test film is peeled off, and this amount of movement is equal to the amount of peeling of the test film from the test specimen, so that the peeling of the test film and the movement of the test specimen can be synchronized without using a separate synchronizing mechanism, and therefore a peel test can be easily performed in which the test film is peeled off from the test specimen using a general-purpose tensile testing machine. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of a peel test fixture of the present invention. [Diagram 2] FIG. 2 is a front view of the peel test fixture of FIG. 1. [Diagram 3] 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] 3 is a cross-sectional view of FIG. 2 taken along line B-B. [Diagram 5] FIG. 2 is a front view showing a first modified example of the peel test fixture in FIG. [Figure 6] FIG. 2 is a front view showing a second modified example of the peel test fixture of FIG. [Figure 7] FIG. 2 is a perspective view showing a second embodiment of a peel test fixture according to the present invention. [Figure 8] FIG. 11 is a perspective view showing a third embodiment of a peel test fixture according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the peel test jig of the present invention will be described in detail with reference to the drawings. The embodiments shown below are examples of devices and methods for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components to the embodiments below. In addition, the drawings are schematic. Therefore, it should be noted that the relationship and ratio between the thickness and the planar dimensions are different from the actual ones, and the drawings include parts where the relationship and ratio of the dimensions are different from each other.

[0012] FIG. 1 is a perspective view showing a first embodiment of a peel test jig, and FIG. 2 is a front view of the peel test jig of FIG. 1. In this embodiment, for example, in order to measure the adhesive strength of a decorative sheet (adhesive sheet) of a building material, a decorative sheet attached to a medium density fiberboard (MDF) is pulled in a direction perpendicular to the adhesive surface to measure the peel adhesion strength (90° peel test). The test specimen 3 used in the peel test is an elongated fiberboard with a decorative sheet of the same shape attached to its upper surface, and one end of the decorative sheet in the longitudinal direction is peeled off from the fiberboard to form a test film 4, which is held vertically upward by one of the opposing gripping parts 1 and 2 (the upper gripping part 1) of a vertical tensile tester (not shown). In FIG. 1, a part of the test film 4 is shown by a virtual line.

[0013] On the other hand, the test specimen 3 is held horizontally by the holding part 5 of the jig, and the holding part 5 is held by the other (lower) holding part 2 of the tensile tester. The two holding parts 1 and 2 are relatively separated to peel the decorative sheet, which is the test film 4, from the test specimen 3, and the load caused by the peeling is measured by the tensile tester to obtain the peel adhesion strength. In this embodiment, as described later, the part near the long side of the elongated rectangular upper surface of the test specimen 3 is regulated so that the test specimen 3 does not float when the test film 4 is peeled off. For this reason, a cut 21 such as a perforation is made in the test film 4 along the length of the test specimen 3 at the part near the long side, and only the inside part of the cut 21 is peeled off. The tensile tester is a general-purpose one that performs tests such as tensile breaking strength of elongated test pieces.

[0014] In the holding section 5, a long and narrow rectangular steel plate is bent at a right angle in the longitudinal center to form a base section 6 extending horizontally and a gripped section 7 extending vertically downward, which are formed in series, and this gripped section 7 is gripped by the gripping section 2 at the bottom of the tensile tester. The test specimen 3 is mounted on the top surface of the base section 6 so that the longitudinal direction of the test specimen 3 coincides with the extension direction of the base section 6. A pressing member 18 is attached to the top surface of the base section 6 at both ends in a direction perpendicular to the extension direction of the base section of the top surface (hereinafter referred to as the width direction) to press down the long side portions of the long and narrow rectangular top surface of the test specimen 3 from above, and a restricting member 19 is attached to the gripped section side end of the pressing member 18 to restrict the position of the peeled portion of the test film 4 from the test specimen 3.

[0015] Fig. 3 is a cross-sectional view taken along line AA in Fig. 2, and Fig. 4 is a cross-sectional view taken along line BB in Fig. 2. The pressing member 18 is formed, for example, by cutting a rectangular steel material long in the extension direction of the substrate 6, and the corners of the steel material on the inner side of the substrate 6 in the width direction are cut into a square shape along the extension direction of the substrate to provide guide parts 8 that guide both ends in the width direction of the test piece 3, and the parts formed to remain above the guide parts 8 constitute pressing parts 9 that regulate both ends in the width direction of the test piece 3 from above. A predetermined gap is provided between the inner side surface of the guide parts 8 and both ends in the width direction of the test piece 3, and a very small predetermined gap is also provided between the lower surface of the pressing parts 9 and the upper surface of the test piece 3 (test film 4).

[0016] Therefore, the widthwise and vertical movements of the test specimen 3 mounted on the upper surface of the substrate 6 are restricted by the guide portion 8 and the pressing portion 9 of the pressing member 18, and the test specimen 3 is held slidably in the extension direction of the substrate 6, i.e., the joining direction of the test film 4 to the test specimen 3, i.e., the peeling surface direction. In this embodiment, the peeling direction of the test film 4 is set vertically upward with respect to the horizontally placed test specimen 3, so that the test specimen 3 is held slidably at a predetermined angle (=90°) with respect to the peeling direction of the test film 4. In addition, the test specimen 3 is held so that the peeled portion of the test film 4 from the test specimen 3 is perpendicular to the peeling direction of the test film 4. Each pressing member 18 is fixed to the substrate 6 by two bolts 31.

[0017] The upper part of the end of the holding part side of the pressing member 18 is cut in a square shape up to the same height as the lower surface of the pressing part 9 to form a mounting part 20, and a regulating member 19 made of a long and narrow steel plate elongated in the width direction of the substrate part is mounted so as to span the mounting parts 20 of the two holding members 18 and is fixed to the substrate part 6 by a bolt 32. The test film 4 on the test piece 3 is bent vertically upward at the lower corner of the holding part 7 side of the regulating member 19 and is held by the upper gripping part 1 of the tensile tester. Therefore, the lower corner of the holding part 7 side of the regulating member 19 is arranged in the immediate vicinity of the test film 4 on the test piece 3 over the entire length of the peel width of the test film 4 at a position facing the gripping parts 1 and 2, and constitutes a regulating part 10 that regulates the position of the peeled part of the test film 4 from the test piece 3. The lower corner of the holding part 7 side of the regulating member 19 that constitutes this regulating part 10 is subjected to so-called light chamfering.

[0018] The test piece 3, which is mounted on the upper surface of the substrate 6 and guided by the pressing portion 9 and guide portion 8 of the pressing member 18, has the test film 4 peeled off at the position of the regulating portion 10, and moves, for example, to the left in Fig. 2 as the test film 4 is peeled off. By regulating the position of the peeled portion of the test film 4 with the regulating portion 10, the test piece 3 moves in the peeled surface direction by the amount that the test film 4 is peeled off. Therefore, the amount of peeling of the test film 4 and the amount of movement of the test piece 3 are the same, so no mechanism is required to synchronize the movements of the two.

[0019] In this manner, in the peel test jig of this embodiment, one end of the test film 4 to be peeled off from the test piece 3 is held by one of the opposing gripping parts 1 and 2 of the tensile tester, and the other gripping part 2 of the tensile tester holds the holding part 5 to perform a tensile test. The load when the test film 4 is peeled off from the test piece 3 is measured by the tensile tester, and for example, the peel adhesion strength is obtained. At this time, the position of the peeled part of the test film 4 from the test piece 3 is restricted by the restricting part 10 to the opposing position of the gripping parts 1 and 2, so that the test piece 3 held by the holding part 5 is moved at a predetermined angle, that is, in the peeling surface direction, with the peeling of the test film 4. Since this movement amount is equivalent to the peeling amount of the test film 4 from the test piece 3, the peeling of the test film 4 and the movement of the test piece 3 can be synchronized without using a separate synchronization mechanism, and therefore a peel test in which the test film 4 is peeled off from the test piece 3 can be easily performed using a general-purpose tensile tester.

[0020] Furthermore, since the test specimen 3 is held so that the peeling portion of the test film 4 from the test specimen 3 is perpendicular to the peeling direction of the test film 4, shear stress is less likely to act on the test film 4 abutting the regulating portion 10, and therefore, the test film 4 is prevented from being cut during the peel test. FIG. 5 is a front view showing a first modified example of the peel test jig of FIG. 1, and FIG. 6 is a front view showing a second modified example of the peel test jig of FIG. 1. If the peel direction of the test film 4 with respect to the bonding surface (= peel surface) of the test film 4 to the test body 3 is defined as the peel angle, the peel angle of the test film 4 is an index showing in which direction the test film 4 is pulled and peeled off with respect to the test body 3. Since the test film 4 is pulled in various directions, it is desirable to be able to set the peel angle according to the conditions. FIG. 5 is a modified example in which the inclination angle of the substrate part 6 with respect to the gripped part 7 is set to 135°, thereby setting the peel angle of the test film 4 to 135°. Similarly, FIG. 6 is a modified example in which the inclination angle of the substrate part 6 with respect to the gripped part 7 is set to 160°, thereby setting the peel angle of the test film 4 to 160°. In each modified example, the shape of the regulating member 19 is adjusted so that the regulating member 19 does not interfere with the test film 4 peeled off at a position other than the regulating part 10.

[0021] FIG. 7 is a perspective view showing a second embodiment of the peel test jig. The tensile tester including the test specimen 3, the test film 4, and the gripping parts 1 and 2 in this embodiment is the same as that in the first embodiment, so detailed description thereof will be omitted. In this embodiment, for example, a pressing member 18 that presses both ends in the width direction of the test specimen 3 from above is attached to the upper surface of the substrate part 6 of the substrate member 22 made of a rectangular steel plate in a plan view that is slightly longer in the longitudinal direction of the test specimen 3, and the restricting part 10 is integrally formed with the pressing member 18. Specifically, the angle-shaped pressing members 18 that constitute the guide part 8 and the pressing part 9 in the first embodiment are arranged opposite both ends in the width direction of the substrate part 6, and the restricting member 19 formed by bridging the longitudinal center parts of the opposing pressing members 18 is formed integrally with the pressing member 18, and the corner part of the lower left end of the restricting member 19 in the figure is formed at an acute angle, and its tip part is made the restricting part 10. That is, the test film 4 is peeled off from the test piece 3 at the position of the restricting portion 10 .

[0022] The biggest difference between this embodiment and the first embodiment is that an angle adjustment mechanism 24 is provided for adjusting the holding direction of the test body 3 by the substrate part 6 relative to the peeling direction of the test film 4, i.e., the peeling direction. Therefore, in this embodiment, the gripped part 7 gripped by the lower gripping part 2 is formed on a gripped part 23 separate from the substrate member 22, and the gripped part 23 and the substrate member 22 form the holding part 5. A plate-like base part 25 that extends horizontally at the upper end of the gripped part 7 of the gripped part 23 and is rectangular in plan view and elongated in the extension direction of the regulating part 10 is formed. A pair of bearing parts 26 are arranged in the extension direction of the regulating part 10 on the upper surface of the base part 25 and protrude upward, and the bearing parts 26 are formed with through holes (not shown) whose axis is parallel to the extension direction of the regulating part 10.

[0023] Meanwhile, a pair of bearings 27 are also provided on the underside of the base plate 6, arranged side by side in the extension direction of the regulating portion 10 and protruding downward, and these bearings 27 are also formed with through holes (not shown) whose axes are parallel to the extension direction of the regulating portion 10. In this embodiment, the pair of downward bearings 27 protruding from the base plate 6 are tightly fitted inside the pair of upward bearings 26 protruding from the base 25. Also, a female screw (not shown) is formed in the through hole of the upward bearing 26 of the base 25 (not shown), i.e., the bearing 26 located at the backmost position in FIG. 7.

[0024] A rotating shaft (not shown) is inserted through the through holes of the bearings 26 and 27. The rotating shaft is inserted into the through holes of the bearings 26 and 27 from the front side of FIG. 7, and a flange portion 28 having the same function as the head of a bolt is formed at the end of the rotating shaft on the front side in the insertion direction, and a handle portion 29 is provided on the flange portion 28. A male thread (not shown) is formed at the tip of the rotating shaft in the insertion direction to be screwed into a female thread formed in the through hole of the bearing portion 26 located at the innermost position, and is screwed into the female thread in the inserted state of the rotating shaft. Incidentally, the outer diameter of the male thread forming portion of the rotating shaft is smaller than the outer diameter of the portion on the front side in the insertion direction.

[0025] Therefore, when the rotating shaft is rotated by pinching the handle portion 29 so that the male screw of the rotating shaft is fastened to the female screw of the bearing portion 26, the thrust of the screw generated between the flange portion 28 of the rotating shaft and the bearing portion 26 located at the innermost position presses the bearing portion 27 of the substrate portion 6 and the bearing portion 26 of the base portion 25, and the substrate portion 6 and the base portion 25 are fixed. From this state, when the rotating shaft is rotated so that the male screw of the rotating shaft is loosened from the female screw of the bearing portion, the pressing force acting between the bearing portion 27 of the substrate portion 6 and the bearing portion 26 of the base portion 25 becomes smaller, and the substrate portion 6 can be rotated around the rotating shaft. Since the rotating shaft is arranged in an axial state parallel to the extension direction of the restricting portion 10, the peeling direction of the test film 4 with respect to the bonding surface (= peeling surface) of the test film 4 to the test specimen 3, i.e., the peeling angle, can be variously changed and adjusted. After the peeling angle is adjusted to a desired angle, the rotating shaft is rotated so that the male thread of the rotating shaft is fastened to the female thread of the bearing portion, thereby fixing the substrate portion 6.

[0026] In this manner, in this embodiment, by providing an angle adjustment mechanism 24 for adjusting the peel angle, i.e., the holding (sliding) angle of the test specimen 3 relative to the peel direction of the test film 4, it is possible to perform peel tests by adjusting the peel angle in various ways. FIG. 8 is a perspective view showing a third embodiment of the peel test jig. The tensile tester including the test piece 3, the test film 4, and the gripping parts 1 and 2 in this embodiment are equivalent to those in the first embodiment, so detailed description thereof will be omitted. In addition, the peel angle adjustment mechanism 24 in this embodiment is equivalent to that in the second embodiment, so detailed description thereof will be omitted. In this embodiment, the regulating member 19 for forming the regulating part 10 is not fixed to the holding part 5, specifically, the substrate part 6, but is magnetically attached to the substrate part 6 made of a steel plate. This regulating member 19 has a pressing part 30 made of, for example, a steel plate, which is sized to fit between the pressing parts 9 of the opposing pressing members 18, and a regulating part 10 formed in series at the lower left end of the pressing part 30 in the figure, and the shape of the regulating part 10 is approximately equivalent to that in the second embodiment.

[0027] In this embodiment, two magnets 31 are embedded in the lower surface of the pressing part 30, i.e., in the part on the test film 4 side, and the entire regulating member 19 is magnetically attached to the steel plate substrate part 6 by the magnetic force of these magnets 31. Therefore, in this embodiment, the regulating part 10 (regulating member 19) is disposed in contact with the test film 4. As in the previous embodiments, the test film 4 is peeled off from the test body 3 at the position of the regulating part 10. At this time, the test film 4 is pressed toward the substrate part 6 by the pressing part 30 of the regulating member 19, but if the moving force of the test body 3 accompanying the peeling of the test film 4 is greater than the magnetic force magnetically attaching the regulating member 19 to the substrate part 6, the test body 3 is moved in the peeling surface direction accompanying the peeling of the test film 4. At that time, the regulating member 19 is moved in a sliding manner on the upper surface of the test film 4, so that the pressing force of the pressing part 30 of the regulating member 19 on the test film 4 continues to act during that time. Therefore, in this embodiment, depending on the circumstances, the pressing part 9 may not be required for the pressing member 18.

[0028] Thus, in this embodiment, the regulating member 19 (regulating portion 10) is separate from the holding portion 5, and this regulating member 19 is magnetically attached to the substrate portion 6 (holding portion 5) via the test piece 3, making it possible to further simplify the configuration of the jig. EXAMPLES

[0029] As an example, a test specimen 3 was prepared by attaching an olefin-based wood grain decorative sheet to a 2.5 mm thick MDF substrate with a water-based urethane adhesive, and the decorative sheet was peeled off from the test specimen 3 at one end in the longitudinal direction, and a 90° peel test was performed using the peel test tool of the first embodiment. As a comparative example, the same test specimen 3 was directly held by the lower gripping part 2 of the tensile tester, and the test film 4 once peeled off in the longitudinal direction was similarly directly held by the upper gripping part 1 to perform a 180° peel test. In the example, the test film 4 made of a decorative sheet was peeled off without stretching, with the MDF fibers attached to the peeled surface of the test film 4. Since the peel interface of the MDF at this time was the same as the peel interface when the decorative sheet was peeled off by hand, it is presumed that the peel adhesion strength was measured to be the same as when the sheet was peeled off by hand. In contrast, in the comparative example, since the MDF fibers did not adhere to the peeled test film 4, it was observed that the peel interface was different from when the sheet was peeled off by hand. Furthermore, the peeled test film 4 was stretched more than before peeling, and as a result, the peel adhesive strength was measured to be large.

[0030] The peel test jig according to the embodiment has been described above, but the present invention is not limited to the configuration described in the above embodiment, and various modifications are possible within the scope of the gist of the present invention. For example, in the above embodiment, the angle adjustment mechanism 24 that allows the substrate part 6 to rotate around a rotation axis inserted into the bearing part of the substrate part 6 and the bearing part of the base part 25 and enables adjustment of the peel angle has been described, but the configuration of the angle adjustment mechanism 24 is not limited to this, and a wide variety of well-known angle adjustment mechanisms 24 (and fixing mechanisms) can be adopted.

[0031] In the above embodiment, the decorative sheet (adhesive sheet) is used as the test film 4, and the fiberboard with the decorative sheet attached is used as the test specimen 3, but the test film 4 and the test specimen 3 are not limited to these. For example, it is also possible to apply an adhesive tape to the test film 4 instead of the adhesive sheet, and to apply a metal plate or a resin plate instead of the fiberboard. [Explanation of symbols]

[0032] 1, 2 Grip part 3. Test specimen 4 Test membrane 5 Holding part 10 Regulatory Department 24 Angle adjustment mechanism

Claims

1. A peel test tool for performing a peel test by gripping one end of a test film to be peeled from a test specimen with one of the opposing gripping parts of a tensile tester, A holding part that can be held by the other holding part and holds the test body slidably at a predetermined angle with respect to the peeling direction of the test film; A peel test tool comprising: a regulating portion that is positioned opposite one of the gripping portions and is positioned immediately adjacent to the test film on the test specimen or in contact with the test film over the entire length of the peel width of the test film, and that regulates the position of the peeled portion of the test film from the test specimen.

2. The peel test fixture according to claim 1 , wherein the holding portion holds the test specimen so that a peeled portion of the test film from the test specimen is perpendicular to a peeling direction of the test film.

3. 2. The peel test fixture according to claim 1, further comprising an angle adjustment mechanism capable of adjusting the predetermined angle.

4. 2. The peel test fixture according to claim 1, wherein the restricting portion is separate from the holding portion, and the restricting portion is magnetically attached to the holding portion via the test piece.

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