JP4316392B2 - Peel strength measuring device - Google Patents

Description

  The present invention relates to a peel strength measuring device for measuring the peel strength of a member bonded with an adhesive, and in particular, it is possible to measure an accurate peel strength by suppressing expansion and contraction of a member to be peeled of an elastic body in measurement by T-shaped peel. The present invention relates to a peel strength measuring apparatus.

A peeling test is known as a test for evaluating the adhesive force between a sticking member and a sticking member bonded together by a pressure sensitive adhesive, like an adhesive tape. As shown in FIG. 7, there are T-shaped peeling, 90-degree peeling, 180-degree peeling, and the like, as shown in FIG. In such a peeling test, for example, in the peeling speed measuring method for measuring the peeling distance after a certain time, the peeling speed is initially slow, but the peeling speed gradually increases, so it is measured with a test piece. There was a problem that time and the like were different, and accurate performance comparison could not be performed.
In response to such a problem, a technique of a peeling tester that enables measurement without changing the peeling speed, the test time, etc. has been proposed (for example, see Patent Document 1).
JP 2000-180350 A

However, in a peeling test machine with a constant peeling speed as described above, when two members to be peeled (sticking members) are pulled at the same time in T-peeling, the members to be peeled extend before peeling, or When the elongation and the peeling proceed simultaneously, and the elongation becomes large and the adhesive strength is overcome, the phenomenon that the peeling progresses and the member to be peeled shrinks occurs. As described above, there is a problem in that the peel strength cannot be accurately measured because a phenomenon in which the member to be peeled expands and contracts occurs during the measurement in the T-shaped peeling.
Therefore, the present invention has been made in consideration of the above-described situation, and when peeling a member to be peeled, which is an elastic body, in a T-shape, the phenomenon that the member to be peeled expands and contracts is suppressed, and the peeling strength is accurately measured. It is an object of the present invention to provide a peel strength measuring device that can be used.

In order to solve the above-described problem, the invention according to claim 1 is configured such that both ends of the adherend member and the peelable member bonded by the adhesive are fixed with clamps, respectively, With one clamp fixing the end fixed to the table, the other clamp fixing the end of the member to be peeled is moved to peel the member to be peeled from the member to be adhered In the peel strength measuring device that measures the peel strength while moving, when the T-shaped peeling is performed in which both members are peeled in a substantially T shape, the two members move together with the other clamp, A holding guide for holding the portion while maintaining a predetermined angle with respect to the moving direction of the other clamp, and peeling the member to be peeled in a direction of 90 degrees with respect to the member to be stuck; When peeling 90 degrees After one clamp used for T-peeling is removed from the table and the adherend member is placed on the table, the clamp is placed on the adherend member in a pair with the other clamp. And a 90-degree peeling clamp that fixes an end portion of the adherend member to the table from the upper surface side of the clamp plate .
In the invention according to claim 2, the clamp plate is formed with a notch that exposes only the member to be peeled in a state where the clamp plate is placed on the member to be adhered. Features.

According to the present invention, the elastic body is provided with the holding guide that moves together with the other clamp and holds the unseparated portions of both members while always maintaining a predetermined angle with respect to the moving direction of the other clamp. In this case, when the member to be peeled, which is a sticking member, is peeled T-shaped, the phenomenon that the member to be peeled expands and contracts can be suppressed, and the peel strength of both members can be accurately measured.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an outline of a peel strength measuring apparatus as an embodiment of the present invention. Further, FIG. 2 is an end view of a test piece (member) to be tested, and an adhesive is applied to a PET film 16 as a member to be adhered by urethane resin 15 which is an elastic member and a member to be peeled off. Is pasted.
As shown in FIG. 1, the peel strength measuring device includes a support member 10, a table 17, clamps 12 and 13, a load measuring instrument 11, a holding guide 14, and the like. FIG. 1 shows measurement by T-peeling in which the above-mentioned test piece is peeled off in a substantially T-shape. The end of the PET film 16 of the test piece is clamped and fixed to the clamp 13, and urethane resin is attached to the clamp 12. The end of 15 is clamped and the unpeeled portion is placed on the holding guide 14 and set so that it can be measured. Note that the substantially T-shape is not limited to a T-shape in a strict sense, and the drawing directions of the urethane resin 15 and the PET film 16 form an angle of about 180 degrees and do not cross each other. This includes the case where the peeling portion A extends in a predetermined direction (it is not necessary to be orthogonal to the urethane resin and the PET film 16 film). Therefore, a Y-shaped form is also included.
At the time of measurement, the clamp 12 moves together with the load measuring device 11 in the direction of the arrow in the figure by the motor drive in this example with respect to the clamp 13 fixed to the table 17 (in this example, it rises). Thereby, the load measuring instrument 11 measures the load when the urethane resin 15 is peeled against the adhesive force from the PET film 16, and the peel strength of the test piece is obtained.
The holding guide 14 is attached to the same fixing member as the clamp 12 and rises together with the clamp 12. Further, the holding guide 14 is set so that the portion holding the test piece is at a predetermined angle (see FIG. 1) with respect to the moving direction of the clamp 12, and the unpeeled portion A of the test piece is started to peel off. The urethane resin 15 and the PET film 16 are always kept at a constant angle.
If the unpeeled portion of the test piece is maintained at a predetermined angle in this way, the phenomenon that the urethane resin 15 expands and contracts when an elastic body such as the urethane resin 15 is pulled can be suppressed. This makes it possible to accurately measure the peel strength of the test piece.
The peel strength measuring device also includes a clamp plate (not shown) that fixes a part of the test piece and is paired with the clamp 12, and peels it in a direction of 90 degrees with respect to the unpeeled portion A of the test piece. It is also possible to measure the peel strength of the test piece in the 90 degree peeling.

FIG. 3 shows a case where a test piece (member) for 90-degree peeling is attached by removing the clamp 13 used for T-shaped peeling. As shown in FIG. 4, the test piece for 90-degree peeling is an adhesive member, and is configured by laminating a urethane resin 18 as a member to be peeled and a PET film 19 as a member to be stuck. FIG. 5 shows a state in which a 90-degree peeling test piece (FIG. 4) is set. As shown in the figure, in setting the test piece, the clamp 13 is removed, set on the table 22, the clamp plate 20 is placed, and the clamp 21 is fastened and fixed.
As shown in FIG. 6, a notch 20a is formed in the clamp plate 20 so that only the part to be peeled (urethane resin 18) of the test piece is exposed. As a result, only the portion of the test piece other than the urethane resin 18 is pressed and held by the clamp plate 20. At the time of measurement, one end of the urethane resin 18 of the test piece for peeling at 90 degrees is fixed to the clamp 12 of the load measuring device 11, and the load measuring device 11 is raised to measure the peel strength of the test piece.
In this way, the clamp 13 used for T-shaped peeling can be easily removed, and switching to 90-degree peeling is easy. In addition, since the notch is formed on the clamp plate 20 used for 90-degree peeling so that only the member to be peeled (urethane resin 18) is exposed, setting becomes easy, and peeling strength measurement based on reliable fixation is possible. Become.

The front view of embodiment (peeling strength measuring device) of the present invention. The top view of a test piece (member). The front view of the peeling strength measurement apparatus at the time of making it attach the test piece for 90 degree | times peeling. The top view of the test piece for 90 degree | times peeling. The top view which shows the set state of the test piece for 90 degree | times peeling. The top view of the clamp board 20. FIG. Schematic which shows the kind of peeling form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support member 11 Load measuring instrument 12, 13, 21 Clamp 14 Holding guide 15, 18 Urethane resin 16, 19 PET film 17, 22 Table 20 Clamp plate

Claims (2)

In a state where both ends of both the adherend member and the peelable member bonded by the adhesive are fixed with clamps, and one clamp fixing the end portion of the adherend member is fixed to the table , In the peel strength measuring device for measuring the peel strength while moving the other clamp fixing the end of the peeled member and peeling the peeled member from the adherend member ,
When performing T-shaped peeling in which both members are peeled off in a substantially T shape, the member moves together with the other clamp, and the unseparated portion of both members is moved with respect to the moving direction of the other clamp. It has a holding guide that holds it while maintaining it at a predetermined angle,
When performing the 90-degree peeling that peels the peel- off member from the adherend in a 90-degree direction, one of the clamps used for the T-shaped peel is removed from the table and placed on the table. After the adherend member is placed, a clamp plate placed in a pair with the other clamp on the adherend member, and an end portion of the adherend member from the upper surface side of the clamp plate A peeling strength measuring device comprising a 90-degree peeling clamp for fixing the tape to the table . The peel strength measurement according to claim 1 , wherein the clamp plate is formed with a notch that exposes only the member to be peeled in a state where the clamp plate is placed on the member to be stuck. apparatus.

Images