JPS624658B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the adhesion of rubber or rubber-like elastic sheets or paint-like substances such as adhesive tapes and inks.

This type of adhesive force measurement is carried out by pressing samples together under a light load and measuring the force required to peel them off.

Such a pressure-peel type adhesive force measurement device involves bringing a metal disk wrapped around a sample piece into contact with a sheet-like sample under a predetermined load, and measuring the force required to move the metal disk and peel off both samples. There is a pick-up type device (for example, British Patent No. 742214) that measures adhesive strength by measuring . Furthermore, as an improvement patent for the above-mentioned pick-up type device, Japanese Patent Application Laid-Open No. 51-75580
No. 51-75581 and Japanese Utility Model Publication No. 55-33233 have been proposed.

The pressure bonding load of each of the conventional devices has the following problems. In general, crimping loads are classified into loads and dead loads, but in all of the conventional devices mentioned above, the weights are fixed to the device itself, or even if the weights are removable, the device itself must be disassembled. As a result, it was a very complicated mechanism that acted like a dead weight.

The crimp load originally has an important influence on the evaluation of the adhesive strength of the sample, and the magnitude of the crimp load can reverse the superiority or inferiority of the adhesive strength evaluation. The present invention has been made with attention to the above points, and an object of the present invention is to provide an adhesive force measuring device that allows the pressure bonding load to be easily and arbitrarily varied.

The embodiments shown in the drawings will be described below.

In Figure 1, 1 is a cube-shaped outer frame,
A sample holder 2 for the lower sample S is fixed to the lower end, and the main body of the measuring device shown in FIG. 2 is housed inside. The lower sample S is placed on the stand 3. Outer frame 1
The front side of the is an operation surface, and this operation surface includes a push button switch 4 with an indicator light that lights up while the power is on, an indicator light 5 that lights up when crimping, and a display that lights up when peeling. A light 6, a push button switch 7 for starting the test, a push button switch 8 for stopping the test, a speed adjustment knob 9 for setting the rotation speed of the servo motor 18, which will be described later, and an indicator 1 for adhesive strength.
0. A timer display 11 for setting the crimping time and the like are provided.

The displays 10 and 11 may be analog displays such as meters using scale plates, but it is preferable to use digital displays such as numeric displays because they can be easily read.

As shown in FIG.
4, which are fixed at a predetermined distance apart in the vertical direction, and are attached to the lower fixing plate 13.
The whole is supported by book legs 16. The rotating shaft 17 is a threaded rod with a square thread formed over almost its entire length, and its lower end is directly connected to the rotating shaft of a servo motor 18 fixed to the upper surface of the lower fixed plate 13, and its upper end is connected to the upper fixed plate 12. Rotatably connected.

A movable body 20 is provided between the fixed plates 12 and 13, through which a rotating shaft 17 and fixed shafts 14 and 15 pass. The hole in the movable body 20 through which the rotary shaft 17 passes is a female screw threaded into the rotary shaft 17, and when the rotary shaft 17 is rotated by the servo motor 18, the movable body 20 moves in the vertical direction.

A tension-compression type spring scale 21 is fixed to the lower surface of the movable body 20, and the upper part of a shaft 22 is fixed to the spring scale 21, and the upper sample S' is attached to the lower part of the shaft 22. The metal disc 23 is the set screw 2
A support 24 supported via 5 is fixed. As the movable body 20 moves up and down, the spring meter 2
1, the shaft 22, support body 24, and disc 23 are moved up and down, and the spring gauge 21 receives a tensile load when the movable body 20 rises, and receives a compressive load when the movable body 20 descends.

A loading weight 26 (hereinafter referred to as a weight), which is an important part of the present invention, is attached to the support 24. An example of the structure of the weight 26 is shown in FIGS. 3 and 4. The weight 26 has a short cylindrical shape, and has a circular convex portion 27 formed on its upper surface that rises slightly upward, and a male screw portion 28 with a thread cut on the outer periphery protrudes from the center. Further, a circular recess 29 into which the circular protrusion 27 fits is formed on the lower surface, and a female thread 30 into which the male thread 28 is screwed is formed at the center. Furthermore, a notched groove 31 having a width slightly larger than the diameter of the load shaft 22 is formed from the outer peripheral edge to the center.

To attach the weight 26 to the load shaft 22,
By inserting the notched groove 31 into the load shaft 22, applying the female threaded part 30 to the male threaded part 28 of the weight located at the bottom, and rotating it slightly, the male and female threaded parts 28 and 30 are screwed together. , the circular concave portion 29 and the circular convex portion 27 fit together, and the upper and lower weights are fixed together. Note that if the notch grooves 30 of the upper and lower weights are oriented in different directions when the male and female threaded portions 28 and 29 are completely screwed together, the weights will not come off the shaft 22. A threaded portion 32 having the same configuration as the male threaded portion 28 is provided at the lower end of the shaft 22,
The female threaded portion 30 of the weight at the lowest end is screwed into this. This securely fixes all the weights to the upper part of the support 24. In the adhesion test, if the peeling speed is high, the peeling of the upper and lower samples S and S' will be shocking and the weight 26 will jump up on the axis at the end of the test. The purpose of fixing the weight is to eliminate this dancing.

FIG. 5 shows the results of a test to measure the adhesive strength of a natural rubber-based unvulcanized rubber sheet using the above-mentioned apparatus.

Shaft 22 + support body 24 + disc 23 + as dead load
The device was made so that the load on the set screw 25 was exactly 100.0gr, and the weight was adjusted to exactly 100.0gr.
These are the measurement results when adding 100.0gr, 200gr, 300gr, and 400gr. From the figure, it can be seen that the evaluation of adhesive force reverses as the pressure load increases. That is, these analyzes clarify points that were unclear in the conventional adhesion phenomena, such as the relationship between the pressure bonding load, the viscosity of the sample, and the contact area.

The device of the present invention can be used not only to measure the adhesive force between rubber or rubber-like elastic sheets, but also to measure the adhesive force between rubber or rubber-like elastic sheets and other materials, such as metals and wood, or adhesive tapes, inks, etc. It can also be applied to measuring the adhesion of paint-like substances.

According to the present invention, since the loading weight can be easily attached and removed as described above, the adhesive strength can be measured under various loading conditions. This has the effect of elucidating various characteristics.

[Brief explanation of the drawing]

Figure 1 is a front view of the entire adhesive force measuring device, Figure 2 is a perspective view of the internal mechanism of the same as above, Figure 3 is a plan view of the loading weight, Figure 4 is a cross-sectional view taken along the line - - of Figure 3, FIG. 5 is a graph showing the measurement results by the apparatus of the present invention. 22: shaft, 23: metal disk, 24: support, 2
6: Load weight, 28: Male thread, 30: Female thread, 31: Notch groove.

Claims (1)

[Claims] 1. In a pick-up type adhesive force measurement device that presses the upper sample wrapped around a metal disk to the lower sample and then pulls up the upper sample to measure the pressure bonding and peeling force between both samples, the upper and lower parts of the center A loading weight is provided at the lower end of the shaft connected to the support of the metal disk. It is characterized in that it is removably mounted on a support by screwing the female threaded portion into the threaded portion, and the load weights are removably connected to each other by screwing the male threaded portion and the female threaded portion together. Adhesive force measuring device.