KR20150049913A

KR20150049913A - Apparatus for tesing adehesive strength

Info

Publication number: KR20150049913A
Application number: KR1020130131096A
Authority: KR
Inventors: 문영환; 이재욱; 김기선; 김재철
Original assignee: 엘지전자 주식회사
Priority date: 2013-10-31
Filing date: 2013-10-31
Publication date: 2015-05-08

Abstract

An apparatus for measuring adhesive strength according to an embodiment of the present invention is to measure adhesive strength of a specimen, including a first layer and a second layer to be attached to an upper part of the first layer. The apparatus comprises: a specimen fixation part on which a specimen, that is, an object to measure adhesive strength is placed; and a moving part which can be moved in a first direction toward the specimen fixation part and which can pressurize the second layer of the specimen. The moving part includes a moving part body which moves by being pressurized by the pressurizing part and a cutter fixed to the moving part body and extended downwardly and obliquely toward the specimen. The cutter pressurizes the second layer of the specimen at a side, and a pressurizing force by the pressurizing part can be measured when the second layer is separated from the first layer by being pressurized by the cutter.

Description

[0001] APPARATUS FOR TESING ADEHESIVE STRENGTH [0002]

The present invention relates to an adhesive force measuring apparatus, and more particularly, to an adhesive force measuring apparatus that provides a new measuring method capable of accurately measuring the adhesive force between two bonded members with a minimum error.

BACKGROUND ART [0002] With the recent development of various electronic products, a large number of electronic products include parts formed by adhering members constituting a plurality of layers.

For example, a film for various purposes is attached to a window of a mobile device such as a smart phone. In order to realize a touch display, an ITO film may be pasted on a glass substrate, and a decoration film may be attached to realize a special pattern design on a window.

In the case where a plurality of layers of components are contained in an electronic product, it is necessary to accurately measure the adhesive force between the layers in order to ensure stable performance and improve durability. When a certain amount of force is applied, if it is known whether each layer is separated, the product design can be made with reference thereto.

However, the conventional adhesive force measuring method has a problem that accuracy and repeatability are not high.

1 is a view schematically showing a part of a conventional adhesive force testing apparatus.

1 includes a first layer 11 and a second layer 12 and a first layer 11 and a second layer 12 Is adhered by the adhesive 13, it is used for measuring the adhesive force.

To this end, the measuring device 20 includes a lower part 21 on which the object to be measured is placed, and an upper part 22 located thereon.

The first layer 11 of the member 20 to be measured is fixed to the upper portion of the lower portion 21 with an adhesive and the second layer 12 is fixed to the lower portion of the upper portion 22 with the adhesive 30 do.

In this state, the upper side portion 11 is moved in the direction away from the lower side portion 21, and the force when the first layer 11 and the second layer 12 are separated is measured.

In this case, since the gap between the member 10 to be measured and the measuring apparatus 20 is also fixed by the adhesive 30, an adhesive 10 for fixing the member 10 to be measured and the measuring apparatus 20 30 must have a significantly greater adhesive force than the adhesive 13 for bonding the first layer 11 and the second layer 12 of the member 10 to be measured.

Therefore, when the adhesive strength between the first layer 11 and the second layer 12 is high and the adhesive 13 for bonding the first layer 11 and the second layer 12 has a strong adhesive force, There is a problem that the member 10 to be measured can be separated from the measuring device 20 before the first layer 11 and the second layer 12 are separated.

In this method, when the member 10 using the first layer 11, the second layer 12, and the adhesive 13 of the same material is repeatedly measured, There is a big problem. That is, there is a problem that test repeatability is deteriorated.

When the actual first layer 11 is separated from the second layer 12, the separation of the first layer 11 from the boundary of the first layer 11 proceeds inward, but the conventional measurement method is not related to the actual separation condition There is a limitation in that the force required for separation under the condition is measured.

In order to solve the above problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an adhesive force measurement device capable of increasing the repeatability of a test and realizing an experiment in a condition very similar to a condition in which each layer, Device.

An adhesive force measuring apparatus according to an embodiment of the present invention is an adhesive force measuring apparatus for measuring an adhesive force of a test piece including a first layer and a second layer bonded to an upper portion of the first layer, A specimen fixing part on which the specimen is mounted; A movable part movable in the first direction toward the specimen fixing part and capable of pressing the second layer of the test piece; And a pressing portion that presses the moving portion to move toward the test piece, wherein the moving portion includes a moving portion main body which is pressed and moved by the pressing portion, a cutter fixed to the moving portion main body and extending obliquely downward toward the test piece, Wherein the cutter presses the second layer of the test piece sideways and the pressing force by the pressing portion can be measured when the second layer is pressed by the cutter and separated from the first layer.

According to the present invention, it is possible to perform an experiment in a condition very similar to a condition in which each layer constituting one component is actually separated, thereby increasing measurement reliability.

In addition, the reliability of the test can be increased by increasing the repeatability of the test.

1 is a view schematically showing a part of a conventional adhesive force measuring apparatus.
2 is a view schematically showing an adhesive force measuring apparatus according to an embodiment of the present invention.
3 is a plan view showing a test piece fixing portion.
4 is a plan view showing the test piece fixing portion.
5 is a side cross-sectional view schematically showing a part of an adhesive force measuring apparatus according to an embodiment of the present invention.
6 is a side cross-sectional view schematically showing a part of an adhesive force measuring apparatus according to an embodiment of the present invention.
FIG. 7 is a view schematically showing a part of an adhesive force measuring apparatus according to an embodiment of the present invention, with the moving part as a center.
8 is a view for explaining the operating principle of the pressing portion.
9 is a graph showing a relationship between a distance and a force, which is a value measured by an adhesive force measuring apparatus according to an embodiment of the present invention.

Hereinafter, a mobile terminal according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 2, the adhesive force measuring apparatus according to an embodiment of the present invention includes a test piece fixing unit 100 to which a test piece to be measured is fixed, A moving part 200 moving in a direction away from the moving part 100 and a pressing part 300 pressing a moving part 200 by generating a force for moving the moving part 200.

Here, the test piece is a member composed of two layers, and more specifically, a member in which two layers are bonded by an adhesive material. That is, the first layer 11 and the second layer 12 are bonded to each other by the adhesive material 13. For example, a member in which a glass and an ITO film constituting a touch panel are combined may be a test piece. In this case, the glass may be the first layer 11, and the ITO film attached to the glass may be the second layer 12. [ On the other hand, for more accurate measurement, the area of the first layer 11 located relatively below the first layer 11 may be larger than the area of the second layer 12 located above the first layer 11. Alternatively, at least a part of the first layer 11 may protrude more outward than the second layer 12. [ This is because the end portion of the cutter 220 described later presses the first layer 11 downward by an appropriate force at the upper portion of the first layer 11 while simultaneously pressing the second layer 12 laterally So that it can be pushed out.

Hereinafter, each configuration of the specimen fixing unit 100, the moving unit 200, and the pressing unit 300, which constitute the adhesive force measuring apparatus according to one embodiment of the present invention, will be described in more detail.

First, the test piece fixing unit 100 will be described with reference to FIGS. 3 to 6. FIG. 3 and 4 show a schematic plan view of the specimen fixing part 100, and in FIGS. 5 and 6 a schematic side cross-sectional view of the specimen fixing part 100 is shown.

The test piece fixing part 100 serves to fix the test piece 10 and includes a fixing table 110, a supporting part 120, a fixing screw 130 and a handle 140.

The fixing table 110 has a wide and flat shape as a portion where the test piece is lifted. The fixing table 110 is provided with cutouts 111 and 112 extending along the moving direction of the moving unit 200. Hereinafter, a direction in which the cutouts 111 and 112 extend long is referred to as a first direction. The first direction is also a direction in which a moving part 200, which will be described later, approaches the test specimen fixing part 100 or moves away from the specimen fixing part 100.

The cutouts 111 and 112 may be provided in parallel with each other. That is, the first incision part 111 and the second incision part 112 may be provided. The cutouts 111 and 112 serve as passages through which the fixing screws 130 described later can move.

The supporting part 120 is fixed to the fixing table 110 to fix and support the test piece 10. That is, the test piece 10 prevents the test piece 10 from being pushed in a moving direction (first direction), which will be described later, of the moving part 200.

The supporting part 120 includes an upper part 121 located above the fixing table 110 and a lower part 122 located below the fixing table 110 with the fixing table 110 interposed therebetween do.

The upper portion 121 may have a plate shape elongated in a direction intersecting the direction in which the cutouts 111 and 112 extend. Hereinafter, the direction in which the plate extends is referred to as a second direction. The upper portion 121 may have a through-hole 123 through which a screw described later passes. The plurality of through holes 123 may be provided corresponding to the number of the fixing screws 130. The through hole 123 may have a shape of a long hole extending in the second direction.

The lower portion 122 may be a plate having the same or similar shape as the upper portion 121. The lower portion 122 is formed with a through hole through which the fixing screw 130 can be screwed. A thread may be formed in the through hole. However, the present invention is not limited thereto, and the lower portion 122 may be a nut into which the fixing screw 130 is inserted and screwed.

The fixing screw 130 penetrates the support part 120 and the fixing table 110 in the vertical direction. More specifically, the through holes of the upper portion 121, the cutouts 111 and 112 of the fixing table 110, and the through holes of the lower portion 122 pass through in order. The fixing screw 130 is movable along a first direction that is an extending direction of the cutout in the cutouts 111 and 112 of the fixing table 110. [ A plurality of the fixing screws 130 may be provided. For example, the fixing screw 130 may include a first screw 131 and a second screw 132. The first screw 131 is inserted into the first cutout 111 and is movable. The second screw 132 is inserted into the second cutout 112 and is movable.

A handle 140 is coupled to the top of the screw 130. More specifically, the screw 140 is integrally rotatably coupled to one end of the handle 140, and the other end is formed as a free end. The handle 140 has a suitable length so that the handle 140 can be held by a user. A pair of the handles 140 may be provided. That is, the handle 140 may include a first handle 141 coupled to the first screw 131 and a second handle 142 coupled to the second screw 132.

Hereinafter, the moving unit 200 will be described with reference to FIG. Fig. 7 is a view showing a part of the adhesive force measuring device with the moving part 200 as a center.

The moving part 200 is arranged to be movable in the first direction. The moving unit 200 includes a moving unit main body 210 and a cutter 220 coupled to the moving unit main body 210. The cutter 220 is fixed to the cutter holder 230 coupled to the moving part 210 and may be coupled to the moving part 210 through the cutter holder 230.

The cutter 220 extends obliquely downward and in the direction toward the specimen fixing part 100. [ In other words, it extends in the first direction toward the test specimen fixing part 200, and at the same time, it extends obliquely downward. The cutter 220 has one end fixed to the moving part 210 and the other end formed as a free end. The end portion formed by the free end may have a shape in which at least a part thereof becomes thinner in the vertical direction as it goes outward. That is, the upper and lower thicknesses can be made smaller toward the outer side.

The moving unit 200 may further include a height adjusting unit 240. The height adjuster 240 is provided to adjust the height of the cutter holder 230. When the height of the cutter holder 230 is adjusted, the height of the cutter 220 can be adjusted. Therefore, the height adjusting means 240 is also for adjusting the height of the cutter 220.

In the height adjuster 240, a through hole is formed through the cutter holder 230 so as to pass through the cutter holder 230. A thread is formed on the inner circumferential surface of the through hole, and a height adjusting screw 241 is coupled to the through hole. have. Therefore, the height of the cutter holder 230 and the cutter 220 can be adjusted according to the direction in which the height adjusting screw 241 is rotated.

The moving unit 200 may further include a roller 250 provided at a lower portion of the moving unit 210. Meanwhile, a rail 400 for guiding the movement of the moving unit 200 may be provided on the floor.

Hereinafter, referring to FIG. 8, a pressing portion 300 that generates a force for moving the moving portion 200 and presses the moving portion 200 will be described. 8 is a view schematically showing a part of the pressing part 300 and a part of the moving part 200 in order to explain the operation principle of the pressing part 300. As shown in FIG.

The pressing unit 300 includes a pressing unit body 310 and a direction switching unit 320.

The pushing portion main body 310 can increase or decrease the magnitude of the force by pressing the test piece 10 by generating a force to press an object and accurately measure the magnitude of the force acting thereon . A universal testing machine (UTM) may be used as the pressing unit body 310. When the direction in which the pressing force of the pressing portion main body 310 is different from the direction in which the test piece 10 is to be pressed is different from the direction in which the pressing force of the pressing portion main body 310 is different, The test piece 10 may be pressurized. That is, the pressing portion main body 310 presses the direction switching portion 320, and the direction switching portion 320 presses the test piece 10.

The direction switching unit 320 serves to switch the direction of the force applied from the pressing unit body 310 in a direction orthogonal to the direction. The direction switching unit 320 may be an "L" -shaped member rotating around a hinge axis. That is, the direction switching unit 320 includes a first extending portion 321 and a second extending portion 322 extending at an angle of 90 degrees with respect to each other, and the first extending portion 321 and the second extending portion 322, To the hinge shaft 323.

When the pushing portion main body 310 is provided so as to exert a force only in the vertical direction, the first extending portion is pressed by the pushing portion main body 310, and the second extending portion pushes the moving portion 200 in the first direction . More specifically, when the vicinity of the end of the first extending portion is pushed downward by the pressing portion main body 310, the direction changing portion 320 rotates clockwise, and the second extending portion rotates the moving portion 200 And is pressed in the first direction. The distance from the hinge axis 323 to the point where the force acts on the first extended portion 321 and the distance from the hinge axis 323 to the end of the second extended portion 322 The distance can be the same. This is because, if the distance from the hinge shaft 323 is changed, the magnitude of the force generated in the pressing unit body 310 and the magnitude of the force applied to the actual moving unit 200 can be changed.

Hereinafter, a method of measuring the adhesive force between the respective layers of the test piece 10 bonded in two layers using the adhesive force measuring apparatus having the above-described configuration will be described.

First, a process of setting the test specimen fixing unit 100 to fix the test specimen 10 will be described. The test piece 10 is composed of a first layer 11 and a second layer 12. An adhesive layer 13 made of an adhesive material is disposed between the first layer 11 and the second layer 12 do.

First, the handle 140 is rotated to rotate the fixing screw 130 to release the fixed state between the support 120 and the fixing table 110. When the fixing screw 130 rotates, the distance between the upper portion 121 and the lower portion 122 increases, and the force by which the support portion 120 presses the fixing table 110 in the vertical direction is weakened. Accordingly, a spaced space is formed between the support 120 and the fixing table 110. A gap is formed between the lower portion 122 and the bottom surface of the fixing table 110. At this time, the upper portion 121 is in contact with the upper surface of the fixing table 110 due to its own weight .

When the force for pressing the fixing member 110 from both the upper and lower sides disappears and the gap between the supporting member 120 and the fixing member 110 is generated, the operator inserts the supporting member 120 into the incisions 111 and 112, In the first direction, which is the longitudinal direction of the main body. That is, it becomes possible to move along the direction in which the cutouts 111 and 112 extend.

3, the first screw 131 and the second screw 132 may be aligned in the same position in the first direction, and may be arranged at different positions in the longitudinal direction as shown in FIG. 4, Lt; / RTI > 3, when the first screw 131 and the second screw 132 are aligned in the same position in the first direction, the upper portion 121 is positioned in the extending direction of the cut-out portions 111 and 121 Vertically. 3, when the first screw 131 and the second screw 132 are positioned at different positions in the first direction, the second direction, which is the extending direction of the upper portion 121, 112 in the first direction.

That is, by adjusting the positions of the first screw 131 and the second screw 132, the position and angle of the upper portion 121 can be adjusted.

When the test specimen fixing unit 100 is set in the above manner, the test specimen 10 is placed on the fixing table 110. At this time, the test piece 10 is disposed on the fixing table 110 so as to be in contact with the supporting portion 120 on one side. More specifically, to one side of the support portion 120 that faces the moving portion 200 side. This is to prevent the test piece 10 from being pushed back when the cutter 220 of the moving part 200 presses the test piece 10.

The moving part 200 is moved while the test piece 10 is placed on the fixing table 110 so that the tip of the cutter 220 comes to the boundary of the second layer 12 at the upper part of the first layer 11 .

In this state, the pressing portion 300 is operated. First, the pusher main body 310 is gradually activated by operating the pusher main body 310, so that a large force is gradually applied to the first extension portion 321 of the direction switching portion 320 do.

The second extending portion 322 presses the moving unit main body 210 while the direction changing unit 320 rotates about the hinge axis 323 when a force is applied to the first extending unit 321. [

The moving part main body 210 is pressed toward the test piece fixing part 100 in the longitudinal direction and the cutter 220 moving integrally with the moving part main body 210 presses the side of the first layer of the test piece 10 do.

As the force is gradually increased, the first layer 11 is peeled off from the second layer 12 at any moment and as the moving part 200 continues to move, the first layer 11 and the second layer 12 move further Separated. Therefore, by measuring the force at the boundary of the second layer where the peeling takes place, it can be reflected in the product design.

Fig. 9 is a result of measuring the force required for peeling the ITO film when the ITO film (second layer) is adhered on the glass substrate (first layer). It can be seen that the greatest force is required at the boundary of the film.

That is, when the second layer 12 is actually bonded to the first layer 11, the separation of the second layer 12 is from the edge boundary of the second layer 12, The greatest force is required to separate the boundary portions.

It is therefore advantageous to measure the adhesive force required to separate one layer from the other layer on the basis of how much force is required to separate the boundaries of either layer, It can be said that.

According to an embodiment of the present invention, it is possible to accurately measure the adhesive force at the boundary of any one of the layers, and to increase the repeatability, and as a result, the measurement reliability can be improved.

10: Test piece 11: First layer
12: second layer 13: adhesive layer
100: specimen fixing part 110:
111: first incision part 112: first incision part
120: support portion 121: upper side portion
122: lower side 123: through hole
130: fixing screw 140: handle
200: moving part 210: moving part main body
220: cutter 230: cutter holder
240: Height adjusting part 241: Height adjusting screw
250: roller 300:
310: pressurizing unit main body 320:
321: first extension part 322: second extension part
323: Hinge shaft 400: Rail

Claims

An adhesive force measuring device for measuring an adhesive force of a test piece comprising a first layer and a second layer adhered to an upper portion of the first layer,
A specimen fixing section on which a specimen to be subjected to the adhesive force measurement is placed;
A movable part movable in the first direction toward the specimen fixing part and capable of pressing the second layer of the test piece;
And a pressing portion for pressing the moving portion to move toward the test piece,
The moving unit includes:
A moving part main body which is pressed and moved by the pressing part,
And a cutter fixed to the moving part main body and extending obliquely downward toward the test piece,
The cutter presses the second layer of the test specimen laterally,
The pressing force by the pressing portion can be measured when the second layer is pressed by the cutter and separated from the first layer
Adhesive force measuring device.

The method according to claim 1,
The moving unit may further include a height adjuster capable of adjusting the height of the cutter
Adhesive force measuring device.

3. The method of claim 2,
The test piece fixing portion
A fixing table on which the test piece is mounted,
And a support coupled to the fixed base,
Wherein the support portion includes at least a portion located on the upper portion of the fixing table so as to support one side of the test piece
Adhesive force measuring device.

The method of claim 3,
Wherein the support portion extends in a second direction intersecting the moving direction of the moving portion,
The relative angle of the second direction with respect to the first direction is adjustable
Adhesive force measuring device.

5. The method of claim 4,
Preferably,
A screw penetrating the fixing table and the supporting portion vertically,
A handle coupled to the screw,
Wherein the fixing base is provided with a cut-away portion through which the fixing screw is movable along the moving direction of the moving portion,
As the handle is operated, the fixing screw rotates to adjust the coupling force between the fixing table and the supporting portion
Adhesive force measuring device.

6. The method of claim 5,
At least one pair of the cutout portion, the fixing screw, and the handle,
Wherein the angle adjustment of the support portion is performed in accordance with a difference in position from the moving portion of the pair of fixing screws
Adhesive force measuring device.

The method according to claim 1,
The pressing portion
A direction switching unit for converting a force applied in the vertical direction into a first direction which is a horizontal direction,
And a pressing unit body for pressing the direction changing unit in a vertical direction,
The pressing unit body may adjust the magnitude of the force pressing the direction switching unit and measure the force
Adhesive force measuring device.

8. The method of claim 7,
The direction-
A first extension extending in either direction,
And a second extension extending perpendicular to the first extension,
Wherein the first extension and the second extension are rotatable about a hinge axis
Adhesive force measuring device.

8. The method of claim 7,
The presser unit main body is a universal material testing machine (UTM)
Adhesive force measuring device.

The method according to claim 1,
The moving unit includes:
And a roller provided at a lower portion of the moving unit main body
Adhesive force measuring device.

11. The method of claim 10,
And a guide rail provided on the bottom surface and guiding the movement of the roller
Adhesive force measuring device.