JPS6147372B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method and apparatus for measuring the peel strength of adhesives, plating, and other adhesives, and particularly relates to the measurement of peel strength at arbitrary peel angles and the measurement of peel strength at predetermined peel angles. . Conventionally, the peel adhesion strength of adhesives has been measured using a 180° peel test method between flexible and rigid materials, and a T-shaped (90°) peel test method between flexible materials.
It is described in JIS K6854, and the plating peeling test device (peeling angle 90°)
Described in No. 31481. However, they all attempt to measure the peel strength at a specific peel angle, and the peel adhesive strength of adhesives, plating, and other adhesives is not necessarily suitable for the direction of peeling or the direction in which blistering occurs or expands. It cannot be said that it is measured as something. In order to eliminate the above-mentioned drawbacks, the present invention provides a method and apparatus for measuring peel strength at various peel angles, thereby making it possible to investigate the peel strength that is most correlated with the blistering phenomenon. Next, the principle of the method and device of the present invention will be explained in the first part.
This will be explained based on the diagram. (1) Principle regarding peeling angle 1 is the base material, 2 is the plating layer plated on the base material 1,
3 is the tip of the peeled part where the plating layer 2 is partially peeled off,
Reference numeral 4 denotes a gradient shaft, which is rotated by, for example, a motor 5 to cause the grip portion 9 to slide. In order to keep the peeling angle θ constant, it is necessary to change the peeling angle ∠JAD and θ
Even if the peeling is continued after t minutes and the peeling progresses to point B, the peeling angle ∠JBE at this point B must still be the same θ as at the beginning. This will be considered next. ∠JAD=∠JBE=θ At this point, point A moves to point C, and it can be considered that = Therefore, ∠CAB=γ=180−θ/2=∝/2 …… In other words, the direction in which the condition is satisfied If point A moves to , θ will always remain constant.
Therefore, if the gradient axis 4 is made parallel to and drawn downward from the axis, θ can be kept constant. In other words, the gradient axis 4 for parallel to
If the slope ∠DGH is half of the peeling angle θ, the supplementary angle α of (∠JAD), (180° - θ), peeling is continued and even if the peeling progresses to point B after t minutes, there will still be no peeling. The angle θ, (∠JBE) can be kept constant. (2) Principle regarding peeling speed For example, using a motor 5 with a constant rotation speed,
Even if the speed (moving speed V) of moving the part 9 holding the peeling tip 3 toward the motor 5 side of the gradient shaft 4 is constant, when the peeling angle θ is changed as described above,
The speed at which the material is peeled off from the material to be measured (peeling speed ν) is not constant between before and after the change. Therefore, differences occur between the measured values, making them inappropriate as data for comparison. Therefore, the conditions for keeping the peeling angle ν constant even if the peeling angle θ is changed will be examined next. cosγ=AF/2÷(γ=180−θ/2)=AF/2·cosγ. If AB/t=peeling speed ν and AC/t=moving speed V, then ν=V0/·cosγ. Since V ₅ ∝ (the number of rotations of the motor 5), ν∝(the number of rotations of the motor 5)/2·cosγ. Therefore, by changing the rotational speed of the motor 5 in proportion to 2·cosγ, the peeling speed ν can be kept constant.
However, γ in this case is half the supplementary angle of the peeling angle θ. The present invention utilizes the principles (1) and (2) above in a peel strength measuring method and device. Next, embodiments of the present invention will be described based on the drawings. FIG. 2 is a front view of the embodiment device. In FIG. 2, reference numeral 1 denotes a plated base material, and a mount 6 is provided so as to be movable in a plane parallel to the base 13.
It is placed and fixed on top. Reference numeral 3 denotes a peeling tip obtained by peeling off a portion of the plating layer 2 to a certain width, and protrudes downward from the cutout portion of the pedestal 6. Reference numeral 4 denotes a slope shaft with a screw groove connected to a motor 5 with a transmission capable of forward and reverse rotation, and a slope mount 12 whose one end is rotatably attached to a base 13 by a rotary shaft 14. The shaft is mounted parallel to the top. Reference numeral 8 denotes a load cell, the upper end of which is connected to the peeling tip 3 with a fixture 7, and the lower end of which is connected to a slider 9 that slides by being screwed into the threaded groove of the gradient shaft 4. Reference numeral 10 denotes a strain gauge, which is attached to the load cell 8. Reference numeral 11 denotes a recorder, which is connected to the strain gauge 10 with an electric wire. 16 is a protractor that is centered on the rotating shaft 14 and is perpendicular to the base 13. 1
Reference numeral 7 is a hole drilled on the protractor 16 for fixing the slope mount 12 with the pin 15. Next, the effects of the above-mentioned embodiment device will be explained. (1) The case where the peeling angle θ is 90° will be explained. The pedestal 6 is moved directly above the base 13 and then fixed. The material to be measured (the base material 1 having the plating layer 2) is fixed on the pedestal 6 after the peeling tip 3 has been partially peeled off to a certain width in advance. The slope mount 12 is fixed at a predetermined angle γ with pins 15. This predetermined angle γ is calculated from the above principle by 45
It is ゜. The peeling tip 3 is made perpendicular to the plating layer 2. In other words, the peeling angle θ is 90°. The peeling tip 3 is connected to the upper end of the load cell 8 by a fixture 7, and in a state where the load cell 8 is hanging down, the lower end of the load cell 8 is connected to a slider 9 which has been stopped by contacting the upper end limit switch LS ₁ in advance. . A strain gauge 10 is attached to the load cell 8. After being set in this way, the motor 5 is driven and the slider 9 is moved down toward the motor 5. When the slider 9 is peeled off by a predetermined length, the slider 9 comes into contact with the lower end limit switch _LS2 and is stopped. The peel strength during this continuous peeling is measured by a recorder. In the above embodiment, the case where the peeling angle θ is 90° has been explained. For example, when the peeling angle θ is 60° or 120°, the angle γ of the slope mount 12 is 60° or 120°.
It is sufficient to measure at 30°. As described above, according to the method and apparatus of the present invention, the peel strength at any peel angle θ can be easily and accurately measured, and the apparatus is simple and easy to operate. (2) Explain the case where the peeling speed is constant. When the peeling angle θ is changed as described above, in order to keep the peeling speed ν constant, either change the rotation speed of the motor 5 as shown in the table below, or use a transmission to make the peeling speed ν constant. It is enough to change the rotation speed. For example, when the slider 9 is moved by 1 cm per minute on the threaded gradient shaft 4 with a pitch of 1 mm, the rotational speed is as shown in the following table. Therefore, by changing the rotation speed in this way, the peeling speed ν remains constant even if the peeling angle θ changes.

[Table] By changing the moving speed V of the slider 9 and keeping the peeling speed ν constant as described above, measuring the peeling strength at various peeling angles θ makes it easier to compare these measured values. The method and apparatus according to the present invention are not limited to the above-mentioned embodiments, but can be broadly encompassed as long as they do not go against the gist of the claims of the present application. It does not fall within the scope of the claims of the present application to use a rod or a hydraulic cylinder, or to select any angle other than the peeling angle θ (120°, 90°, 60°) described in the above embodiments. It is something that

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the principle of the present invention, and FIG. 2 is a front view of one embodiment of the device of the present invention. 1: Base material, 2: Plating layer, 3: Peeling tip, 4: Gradient axis, 5: Motor, 6: Frame, 8: Load cell,
9: slider, 10: strain gauge, 11: recorder, 12: slope mount, 13: base, 15: pin, 16: protractor, 17: hole.

Claims (1)

[Claims] 1. The peeling tip is moved away from the pedestal on a straight line parallel to the bisector of the supplementary angle of the peeling angle in a plane that includes the peeling direction and is perpendicular to the pedestal for placing the material to be measured. A peel strength measuring method characterized by measuring the tensile force when pulling. 2 In the measurement method set forth in claim 1, the moving speed of the peeling tip is set in proportion to the cosine of half of the supplementary angle of the peeling angle, thereby keeping the peeling speed constant during measurement. A measurement method characterized by: 3. A pedestal 6 for placing the material to be measured which is fixed in parallel to the base 13, and a slope shaft 4 whose one end 14 is pivotally attached to the base 13 and whose angle relative to the base 13 can be arbitrarily set. a slider 9 that moves along the gradient axis 4; a load cell 8 whose one end is connected to the slider 9 and the other end is connected to the peeling tip 3 of the material to be measured 1; A means for moving along the gradient axis 4, a strain gauge 10 provided on the load cell 8, and a recorder 11 for recording the output of the strain gauge 10.
Therefore, a part of the material to be measured 1 placed on the mount 6 for mounting the material to be measured is peeled off, its tip 3 is connected to the other end of the load cell 8, and the base of the gradient axis 4 is separated. Angle with respect to the table 13 (supplementary angle α of the required peeling angle θ)
The peel strength at a required constant peel angle θ is measured by moving the slider 9 toward the base along the gradient axis 4 while arbitrarily and keeping constant γ), which is half of Peel strength measuring device.