DE7313042U - DEVICE FOR DETERMINING THE ADHESIVE STRENGTH BETWEEN TWO MATERIALS ADHING TO EACH OTHER - Google Patents

Description

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Br. Alfred Gottfried Epprecht
CH-8303 Basnersdorf, Switzerland

Device for determining the adhesive strength between two materials that adhere to one another

A method is known to the adhesive strength between two superposed materials, for example of paint films and similar hoists, to be determined on their documents. According to this procedure a stamp provided with a contact surface is pressed onto the material to be tested and the torque measured what is required to make a disk-shaped part of a material on its own To twist the plane with respect to the other material.

This method has the disadvantage that for an adhesion measurement two measurements are always required. First, you measure what it takes to shear Torque from which the sliding torque determined by a second measurement must be subtracted afterwards.

The innovation relates to a device that is characterized by a test device that is capable to generate and measure a torque and to glue one to the material to be tested with its contact surface, essentially cylindrical punch, which is provided with a collar with an outer polygonal circumference that transmits the torque generated by the test device to the punch.

It has been shown that to measure the adhesive strength of relatively thin layers, such as lacquer layers, Color layers, glue layers, plastic layer en, galvanic coatings, etc. can use a stamp glued to the layer, which at The measurement does not need to be pressed onto the material layer to be tested. The test device can then be set up more simply and you can get by with a single measurement per test piece.

The drawing shows an example of the embodiment according to the invention Device shown and their action

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wisely explained:

Fig. 1 shows a stamp half in side view, eur half in section and below a view from above;

Pig. 2 a stamp while the adhesive layer is hardening and

3 shows the stuck-on stamp according to FIG. 1 as part of the testing device.

In Pig. 1 is a substantially cylindrical stack shown, which has a precisely centric hole 1 of has high precision. The stack of 9 has a contact surface 3 that runs exactly perpendicular to the bore 1 and is provided with a hexagonal collar 8. The latter is a little above the contact surface 3 arranged.

^ You hole 1 serves a dual purpose, first of all it is used to place the stamp exactly vertically on the PiIm 2 to be tested and to glue it. This will be on hand of the Pig. 2 explained. Afterwards it is used to center the stamp in the test device, as in " Pig. 3 is shown.

Pig. 2 shows the stamp being glued to the Film 2 to be tested for its adhesive strength. This is attached to a base 5. First of all, the contact surface 3 of the stamp is covered with a thin layer of adhesive

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(for example a two-component adhesive). so the stamp with adhesive layer 4 is placed on the PiIm 2 and with the help of a rod 6 that fits exactly sliding into the bore 1, during the entire time of glueing guided. So that the rod 6 can be moved in the bore 1 without generating pressure or vacuum, it is eur Ventilation grinded tangentially, provided with a groove or has a ventilation hole. The stick 6 Is in turn held in a support, not shown, which has an exactly vertical position of the rod document 5 guaranteed.

3m a sufficiently high contact pressure during the gluing process EU guarantee and to compensate for any shrinkage that may occur in the adhesive layer during setting, the punch is loaded with a weight 7, which is also passed through the rod 6.

Pig. 3 shows the stamp and a feil dec tester to the actual adhesion measurement. It will Put the pad on the base plate (not shown) of the testing device and the centering pin 9 of the torsion shaft 10 inserted into the bore 1 of the glued-on stamp. This guarantees that the axis of the punch is exactly in the extension of the forsionsaehse 10. Now the pad 5 is secured against rotation and

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Seehskantechltiseel 11 can use the hexagon 8 dee Stamp «will be lowered. The Toreionsachee 10 has also tin Seehskant 12 on, βοdaβ8 then by means of of the Bohrechlüseele 11 rotatably connected to the hexagon 8 is. The hexagon 12 has a spherical surface at the top 13 so that the drill key can swing easily. This ensures that, even in the event that There would still be a slight deviation of the punch axis from the torsion axis, no tilting moments the stamp can come into effect. You fact that the hexagon 8 is very close to the adhesive surface, would also result in a very small lever arm for a possible tilting moment. Of course, the measurement can also after the centering pin 9 has been pulled out of the bore 1.

Claims (3)

Il 'I a till Mil I 'ι t · I ■ «.. .1 I · I. - J 4. It « Sohutzansprttahs 1 * Device for determining the adhesive strength between two materials that adhere to one another, in particular of relatively thin layers on a rigid surface, by measuring the torque that is required, including a loheibenföraigen \ φϋΜιΑΜ * Λ% of one material in its own plane compared to the other Turning materials, characterized by a test device that is able to generate and measure a torque and a substantially cylindrical punch that is glued to the material to be tested with its contact surface (3) and that has a collar (8) with an outer polygonal Scope is provided, which transmits the torque generated by the tester to the punch. 2. Device according to claim 1, characterized in that the stamp has a sentrisoh and perpendicular to the round contact surface (3) has running bore (1). 3. Device according to claims 1 and 2, characterized in that that the test device has a torsion axis (10) with a centering pin (9) and a non-rotatable but adjustable with the torsion axis connected to the outer circumference of the poly Includes pipe wrench (11).