Testing jig for measuring creep resistance and drawing force of adhesive film

Abstract

The utility model relates to the technical field of pressure-sensitive adhesive testing equipment, in particular to a testing jig for measuring creep resistance and drawing force of an adhesive film. The device comprises a machine body and a bottom plate, the machine body is provided with a movable table movably connected to the machine body in the vertical direction, the movable table is provided with a top connecting base, the bottom plate is fixedly provided with a bottom connecting base, a detection jig is arranged between the top connecting base and the bottom connecting base, and the detection jig comprises a top pull block and a bottom pull block which are the same in structure; the top pull block and the top connecting base are detachably connected through a connecting mechanism, and the bottom pull block and the bottom connecting base are detachably connected through a connecting mechanism. Aiming at the test requirements which cannot be met by the conventional standard at present, the drawing force performance and the creep resistance of the small-area adhesive film can be tested at the same time, and the test precision and the test efficiency are met.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure-sensitive adhesive testing equipment, in particular to a fixture for measuring the creep resistance of a glue film and the draw force test. Background Art

[0002] When preparing a glue film, it is necessary to test its performance, including data such as draw force, to determine whether it meets the usage requirements. Therefore, a fixture for detecting the draw force is required. In the Chinese patent with the publication number CN214703017U, a split-type welding lining draw force measuring auxiliary tool is disclosed, which includes a mother module and a son module. The mother module is made of a strong magnet and has a hanging hole at its top. The son module includes a lower module, a left module, and a right module.

[0003] The upper surface of the lower module is adsorbed and connected to the lower surface of the mother module. The left surface and the right surface of the lower module are respectively provided with a left limit hole and a right limit hole. The upper right surface of the left module is adsorbed and connected to the left surface of the mother module, and a left limit protrusion inserted into the left limit hole is provided on the lower right surface of the left module. The upper left surface of the right module is adsorbed and connected to the right surface of the mother module, and a right limit protrusion inserted into the right limit hole is provided on the lower left surface of the right module.

[0004] Nowadays, with the continuous development of the electronics industry towards the direction of refinement, electronic module components are gradually becoming smaller, which also makes the area of the electronic glue bonded to them smaller and thinner. The requirements for the draw force performance of the glue film and the anti-deformation ability of the material are also increasing accordingly.

[0005] For the above-mentioned fixture and existing fixtures, it is necessary to prepare a relatively large sample so that the data is relatively stable during testing, and a single test fixture also has limitations. If a small-area sample is prepared, the glue film will be affected by factors such as pressure, temperature, and humidity, resulting in glue overflow, which will increase the actual bonding area and cause large test errors.

[0006] In order to simulate the performance of the glue film in actual applications, a fixture that can facilitate the testing of the draw force of a smaller area is needed to characterize the performance of the glue film. Content of the Utility Model

[0007] The purpose of the utility model is to provide a fixture for measuring the creep resistance of a glue film and the draw force test, so as to solve the problems raised in the above background art.

[0008] In order to solve the above technical problems, the utility model provides the following technical solution: A fixture for measuring the creep resistance of a glue film and the draw force test, including a machine body and a bottom plate. An activity table is movably connected to the machine body in the vertical direction on the machine body. A top connection seat is arranged on the activity table, and a bottom connection seat is fixed on the bottom plate. A detection fixture is arranged between the top connection seat and the bottom connection seat. The detection fixture includes

[0009] The top pulling block is detachably connected to the top connecting seat and is used for bonding with the top surface of the glue film;

[0010] The bottom pulling block is detachably connected to the bottom connecting seat and is used for bonding with the bottom surface of the glue film;

[0011] The glue film fitting surfaces of the top pulling block and the bottom pulling block are both square or in the shape of a Chinese character 'hui', and the top pulling block and the bottom pulling block have the same structure;

[0012] The top pulling block and the top connecting seat, and the bottom pulling block and the bottom connecting seat are detachably connected through a connecting mechanism.

[0013] Preferably, the top pulling block includes an integrally formed fitting part and a connecting part. The fitting part and the connecting part are square block structures with different thicknesses, and a pin connection hole is provided on the connecting part.

[0014] Preferably, the bottom connecting seat has the same structure as the top connecting seat. The connecting mechanism includes a top connecting block and a bottom connecting block with the same structure. One end of the top connecting block is embedded and fixed in the top connecting seat, and the other end is clamped outside the connecting part.

[0015] Preferably, the top connecting block includes a fitting part. A connecting groove with a shape adapted to the connecting part is provided on the fitting part, and a pin connection hole is also provided at the position corresponding to the pin connection hole on the fitting part. A movable pin is inserted through the pin connection hole.

[0016] Preferably, the top connecting block includes a fixing part. A fixing groove is provided on the top connecting seat. The fixing groove is cylindrical, and the shape of the fixing part is adapted to the shape of the fixing groove. When connecting, the fixing part is embedded in the fixing groove.

[0017] Preferably, the fixing part and the fitting part are connected by a screw. A nut is threadedly connected to the screw; a locking disc is movably sleeved on the screw.

[0018] Preferably, the fixing part and the fixing groove are pin-connected and fixed, and are clamped by the cooperation of the nut and the locking disc.

[0019] Preferably, a tensile and compressive force meter is provided between the movable table and the top connecting seat. The tensile and compressive force meter is equipped with a digital display screen; a control host is connected to one side of the machine body.

[0020] Preferably, an infrared extensometer is movably connected to the machine body and is used for synchronously detecting the thickness change of the glue film when the detection jig presses the glue film to cause deformation.

[0021] Preferably, after the detection jig applies a load to the glue film, the deformation amount is ΔT, and its calculation formula is as follows:

[0022]

[0023] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0024] (1) In the present utility model, the bonding area is controlled by the specified size of the pulling block. Under a fixed bonding area, the glue film will not overflow due to the influence of pressure and temperature, thus increasing the bonding area.

[0025] (2) In the present utility model, the two pulling blocks adopt an inverted T-shaped design. When replacing the sample, the glue film can be easily removed by simply translating it back and forth, with high replacement efficiency and simple and convenient operation.

[0026] (3) In the present utility model, the change situation of the glue film can be detected in real time to ensure the accuracy and stability of the detection data.

[0027] (4) In the present utility model, the mutual cooperation of the pin connection, nut, and locking disc can make the fixation between the connecting block and the connecting seat more tight and firm, avoiding the influence on the detection accuracy of the glue film performance caused by shaking during the pulling and pressing processes.

[0028] (5) The present utility model is designed for the small-area pull force test fixture, which makes up for the test shortcomings of the conventional fixture, reduces the test cost, can better fit the actual application size test of the electronic module, and can also achieve a more accurate detection effect and reduce the test error when testing the small-area glue film. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:

[0030] Figure 1 is the overall structural schematic diagram of the present utility model;

[0031] Figure 2 is the enlarged connection schematic diagram of the detection fixture;

[0032] Figure 3 is the structural schematic diagram of the detection fixture;

[0033] Figure 4 is the schematic diagram of the deformation amount of the glue film before and after applying the load.

[0034] Among them, 1. Machine body; 11. Bottom plate; 12. Movable table; 13. Top connecting seat; 14. Bottom connecting seat; 15. Tensile-compressive force gauge; 16. Control host; 2. Detection jig; 21. Top pulling block; 211. Fitting part; 212. Connecting part; 213. Pin connection hole; 22. Bottom pulling block; 23. Top connecting block; 231. Fitting part; 232. Connecting groove; 233. Fixing part; 234. Fixing groove; 24. Bottom connecting block; 3. Connecting mechanism; 31. Movable pin; 32. Screw; 33. Nut; 34. Locking disc. Detailed implementation manner

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] A test fixture for measuring the creep resistance and pulling force of a glue film, the structure of which is as Figure 1 shown, including a bottom plate 11 placed on the table, a column-shaped machine body 1 is fixed on the bottom plate 11, and a control host 16 is on one side of the machine body 1 for regulating the entire test fixture. A movable table 12 is provided on the machine body 1, the movable table 12 is connected to the machine body 1 in a lifting manner, and a tensile-compressive force gauge 15 is fixed at the bottom of the movable table 12, and the tensile-compressive force gauge 15 is equipped with a digital display screen.

[0037] A top connecting seat 13 is fixed at the bottom of the tensile-compressive force gauge 15, and a bottom connecting seat 14 is provided on the corresponding central axis of the bottom plate 11. A detection jig 2 is arranged between the top connecting seat 13 and the bottom connecting seat 14 and is connected through a connecting mechanism 3. The detection jig 2 includes a top pulling block 21 and a bottom pulling block 22 with the same structure. The top pulling block 21 is detachably connected to the top connecting seat 13 through a top connecting block 23, and the bottom pulling block 22 is detachably connected to the bottom connecting seat 14 through a bottom connecting block 24.

[0038] As Figure 2 and Figure 3 shown, the structures of the two connecting blocks are the same. Here, the structures of the top connecting block 23 and the top pulling block 21 are taken as an example. The top pulling block 21 includes an integrally formed fitting part 211 and a connecting part 212. The fitting part 211 and the connecting part 212 are square structures with different thicknesses, and a pin connection hole 213 is opened on the connecting part 212. One end of the top connecting block 23 is embedded and fixed in the top connecting seat 13, and the other end is clamped outside the connecting part 212. The structure of the top connecting block 23 located in the top connecting seat 13 is the fixing part 233, and the structure connected to the connecting part 212 is the fitting part 231.

[0039] A connecting groove 232 with a shape adapted to the connecting portion 212 is provided on the fitting portion 231. A pin hole 213 is also provided at the position corresponding to the pin hole 213 on the fitting portion 231. A movable pin 31 is inserted into the pin hole 213. During connection, the fitting portion 231 and the connecting groove 232 are fitted with each other and fixed by the movable pin 31. A fixing groove 234 is provided in the top connecting seat 13. The fixing groove 234 is cylindrical. The shape of the fixing portion 233 is adapted to the shape of the fixing groove 234. During connection, the fixing portion 233 is embedded in the fixing groove 234 and fixed by pin connection.

[0040] In order to improve the connection firmness among the detection jig 2, the two connecting blocks and the two connecting seats, the present utility model further adds a connecting mechanism 3, that is, a screw 32 is used to connect between the fixing portion 233 and the fitting portion 231, and a nut 33 is threadedly connected to the screw 32; a locking disc 34 which is movably connected is sleeved on the screw 32. When the fixing portion 233 and the fixing groove 234 are fixed by pin connection, the nut 33 is tightened and cooperates with the locking disc 34 to be clamped tightly, so that the top connecting block 23 and the top connecting seat 13 are locked and fixed.

[0041] The fitting portions 211 of the top pulling block 21 and the bottom pulling block 22 are exactly the same. The cross-sectional shape of the fitting portion 211 is square or square with a loop in the middle. Its size can be 3X3 cm, 5X5 cm, 10X10 cm and other sizes, corresponding to different sizes of adhesive films. In order to ensure the accurate control of the deformation process of the adhesive film during detection, an infrared extensometer can also be used, or the infrared extensometer can be directly arranged on the machine body 1 to synchronously monitor the change of the adhesive film.

[0042] Before detection, both sides of the adhesive film need to be respectively attached to the fitting portions 211 of the top pulling block 21 and the bottom pulling block 22, and a load is applied to the adhesive film through the movable table 12 and kept under pressure for a period of time.

[0043] When detecting the creep resistance of the adhesive film, under specified conditions, by applying the required load and measuring the deformation amount ΔT, the two adhesive film surfaces are gradually separated, and the infrared light will also scan the process of the two adhesive film surfaces being gradually separated. While testing the above-mentioned pulling force, the creep resistance of the adhesive film material will also be evaluated.

[0044] The specific process of testing the deformation amount ΔT is as follows:

[0045] After preparing the sample adhesive film PSA, as Figure 4 shown, at the same cross-section, two points a and b are marked with a marker pen at the top and bottom of the upper and lower T-shaped jigs; first, use an optical microscope to take a photo to test the thickness T1 of the top pulling block, and then take a photo to test the distance between the two points a and b as T2; then use an infrared extensometer to respectively test the above two thicknesses and record them as L1 and L2.

[0046] The sample is kept under pressure for a certain period and then left to stand for 24H / 48H according to the product requirements. Then, the infrared extensometer is used again to measure the above two thicknesses, and L1’ and L2’ are recorded. Assume L1’ = L1.

[0047] It can be obtained that Finally, the deformation amount ΔT is:

[0048]

[0049] The smaller the deformation amount, the stronger the anti-deformation ability of different materials under the same pressure condition, and the better the anti-creep performance of the material. Therefore, it can be seen that the fixture of the present utility model can simultaneously meet the test requirements of the drawing force performance and anti-creep performance of small-area adhesive films, and meet the test accuracy and test efficiency.

[0050] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0051] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A test fixture for measuring creep resistance and pull-out force of a film, comprising a body (1) and a bottom plate (11), characterized in that: The machine body (1) is provided with a movable platform (12) movably connected to the machine body (1) in a vertical direction, the movable platform (12) is provided with a top connecting seat (13), the bottom plate (11) is fixed with a bottom connecting seat (14), a detection fixture (2) is provided between the top connecting seat (13) and the bottom connecting seat (14), and the detection fixture (2) comprises A top pull block (21) is detachably connected to the top connection seat (13) and is used to bond with the top surface of the adhesive film; A bottom pull block (22) is detachably connected to the bottom connection seat (14) and is used to bond with the bottom surface of the adhesive film; The adhesive film bonding surfaces of the top pull block (21) and the bottom pull block (22) are both square or U-shaped, and the top pull block (21) and the bottom pull block (22) have the same structure; The top pull block (21) and the top connecting seat (13), as well as the bottom pull block (22) and the bottom connecting seat (14) are detachably connected via a connecting mechanism (3).

2. A test fixture for measuring creep resistance and pull-out force of a film according to claim 1, characterized in that: The top pull block (21) comprises an integrally formed fitting portion (211) and a connecting portion (212); the fitting portion (211) and the connecting portion (212) are block structures with different thicknesses; and a pin connection hole (213) is provided on the connecting portion (212).

3. A test fixture for measuring creep resistance and pull-out force of a film according to claim 2, characterized in that: The bottom connecting seat (14) has the same structure as the top connecting seat (13), and the connecting mechanism (3) comprises a top connecting block (23) and a bottom connecting block (24) having the same structure, one end of the top connecting block (23) being embedded and fixed in the top connecting seat (13), and the other end being clamped on the outside of the connecting portion (212).

4. A test fixture for measuring creep resistance and pull-out force of a film according to claim 3, characterized in that: The top connection block (23) comprises a fitting portion (231), the fitting portion (231) being provided with a connection groove (232) whose shape matches that of the connection portion (212), the fitting portion (231) also being provided with a pin connection hole (213) at a position corresponding to the pin connection hole (213), and a movable pin (31) being inserted into the pin connection hole (213).

5. A test fixture for measuring creep resistance and pull-out force of a film according to claim 4, characterized in that: The top connection block (23) comprises a fixing portion (233), and a fixing groove (234) is provided on the top connection seat (13). The fixing groove (234) is cylindrical, and the shape of the fixing portion (233) matches the shape of the fixing groove (234). When connected, the fixing portion (233) is embedded in the fixing groove (234).

6. A test fixture for measuring creep resistance and pull-out force of a film according to claim 5, characterized in that: The fixing portion (233) and the engaging portion (231) are connected via a screw rod (32), a nut (33) being threadedly connected to the screw rod (32); and a movably connected locking disk (34) is sleeved on the screw rod (32).

7. A test fixture for measuring creep resistance and pull-out force of a film according to claim 6, characterized in that: The fixing portion (233) is fixed to the fixing groove (234) by pin connection, and is clamped by the nut (33) and the locking disk (34).

8. The test fixture for measuring creep resistance and pull-out force of a film according to claim 1, characterized in that: A tension and pressure gauge (15) is provided between the movable platform (12) and the top connecting seat (13), and the tension and pressure gauge (15) carries a digital display screen; a control host (16) is connected to one side of the machine body (1).

9. The test fixture for measuring creep resistance and pull-out force of a film according to claim 1, characterized in that: An infrared extensometer is movably connected to the machine body (1) and is used to synchronously detect changes in the thickness of the adhesive film when the detection jig (2) applies pressure to the adhesive film to cause deformation.

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