WO2011071212A1 - Dry-attachment fastening system and a method of use for the same - Google Patents

Abstract

Disclosed are: a dry-attachment fastening system which not only gives an outstanding attachment force and creates little noise during coupling and uncoupling but also involves a straightforward structure and is easily capable of large-volume production; and a method of use for the same. To this end, provided are: a dry-attachment fastening system comprising a first attachment member having first microfibre hairs formed on a first substrate, and a second attachment member having second microfibre hairs formed on a second substrate so as to exhibit an attachment force on contact with the first microfibre hairs; and a method of use for the same. The present invention has the advantage that it can be expected to improve production efficiency and effectiveness since, unlike Velcro fastening systems of the prior art, there is no separation into a hook part and a loop part for establishing a join. Further, not only is no noise created in the process of joining and separating but also an attachment force can be obtained even from a very small area due to the use of the micro- or nano-sized microfibre hairs.

Description

Dry adhesive fastening system and its use

The present invention relates to a dry adhesive fastening system and a method of using the same. More specifically, the adhesive strength is better than the existing Velcro fastening system, and there is little noise when detaching and detaching. It relates to a dry adhesive fastening system with improved convenience and a method of using the same.

Adhesives can generally be divided into wet adhesives and dry adhesives. For example, an adhesive tape coated with an adhesive material is widely used as a representative wet adhesive and has excellent adhesive strength. However, once used, it is difficult to reuse and even if separated, the adhesive object such as a substrate, a specific part of the body, and an inner wall of a building is used. There is a problem that the damage or the adhesive material remains on the surface of the adhesive object.

A typical dry fastening system is a hook and loop velcro adhesive system that simulates burdock seeds. Since the Velcro bonding system was first designed by George de Mestral, it is now widely used as a fastener to replace zippers and buttons. Recently, a technology that complements the existing Velcro structure and a variety of applications, such as space flight, skin scuba equipment and ski equipment such as sports equipment, children's clothing, fashion bags have been developed.

For example, the Republic of Korea Patent Publication No. 10-0928394 (registered November 17, 2009) "Velcro fastener" is disclosed. This can be expected to increase the amount of formation of the hook hook per unit area of the tape body to improve the binding strength.

In addition, Republic of Korea Patent Publication No. 10-2002-0023343 (published on March 28, 2002) "Velcro, a top equipped with a squeak band", Republic of Korea Patent Publication No. 10-2002-0023341 (March 2002) 28th) published "Velcro, bottom with squeak band", Republic of Korea Patent Publication No. 10-0542328 (registered on Jan. 03, 2006) "Welcome with Velcro", Republic of Korea Utility Model Publication No. 20-0356413 No. 20/0379829 (registered on March 15, 2005) in the Korean Registered Utility Model Publication No. 20-0379829 (registered on March 15, 2005) is published in July 06, 2004. .

However, the conventional Velcro system mentioned above has to be provided with a pair of hooks (loops) and a loop (loop) for coupling, which makes the manufacturing process cumbersome. In addition, there is a problem that the hook and loop configuration that is necessarily accompanied by the coupling is possible only through the adhesive member is formed with the hook and the adhesive member is formed with a loop, respectively, the production efficiency and effectiveness. In addition, there is a limitation in the field of application because it does not provide sufficient adhesive force, and the use of it is restricted because noise occurs when detaching.

In order to solve this problem, studies are being actively conducted to simulate the adhesion system found in the natural world, and one of them is the simulation of the sole of the tokay gecko. That is, hundreds of billions to billions of fine cilia formed on the tokai gecko lizard toes exhibit strong adhesive force due to van der Waals attraction, and research has been attempted to develop various dry adhesive systems.

Therefore, by using these fine cilia, the problems of the existing Velcro system, that is, a pair of hooks and loops must be manufactured, resulting in reduced productivity and limitations in use, insufficient adhesion, noise, and a constant adhesion area. There is a demand for the development of a new concept of dry adhesive fastening system that has been improved.

Accordingly, a first object of the present invention is to provide a dry adhesive fastening system having the same shape of both structures to be fastened, ensuring economic feasibility of manufacturing, not generating noise, and having excellent adhesive strength.

It is a second object of the present invention to provide a method of using the dry adhesive fastening system.

In order to achieve the first object of the present invention described above, the present invention comprises: a first adhesive member having a first fine cilia formed on a first substrate; And a second adhesive member having a second fine cilia formed on the second substrate so as to be in contact with the first fine cilia.

In addition, in order to achieve the second object of the present invention, the present invention comprises the steps of preparing a first adhesive member having a first fine cilia formed on the first substrate and the second substrate to exhibit the adhesive force with the first micro cilia It provides a method of using a dry adhesive fastening system comprising the step of contacting the second microcilia formed on the first microcilia.

Using the dry adhesive fastening system according to the present invention and a method of using the same, micro or nano-sized micro cilia can be bonded using van der Waals forces, and thus an effect of having a higher tensile strength can be expected compared to a conventional Velcro fastening system. . In addition, unlike the existing Velcro fastening system, there is an advantage that the hook portion and the loop portion for coupling are not distinguished, and thus the production efficiency and effectiveness can be expected to be improved.

In addition, noise is not generated during the coupling / separation process, and micro- or nano-sized fine cilia can be used to realize adhesion in a very small area, thereby having a wider application range than a conventional Velcro system.

1 is a schematic diagram for explaining a dry adhesive fastening system according to an embodiment of the present invention.

2 and 3 are schematic diagrams for explaining the adhesion of the dry adhesive fastening system according to an embodiment of the present invention.

4 is an image taken with an electron microscope of a state in which the first adhesive member and the second adhesive member are bonded to the dry adhesive fastening system according to an embodiment of the present invention.

Figure 5 is a schematic diagram for explaining the detachment of the dry adhesive fastening system according to an embodiment of the present invention.

6 is a view showing experimental conditions for confirming the tensile strength of the dry adhesive fastening system according to an embodiment of the present invention.

7 to 12 are graphs for explaining the correlation between the tensile strength according to the size, aspect ratio, density, and pressure of the micro-ciliary structure of the dry adhesive fastening system according to an embodiment of the present invention.

13 is a schematic flowchart illustrating a method of using a dry adhesive fastening system according to an embodiment of the present invention.

Brief description of the main parts of the drawing

100: first adhesive member 110: first substrate

120: first fine cilia 200: second adhesive member

210: second substrate 220: second micro fine

Hereinafter, a dry adhesive fastening system and a method of using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Conventional Velcro fastening system was a fastening system that is in contact with each other to be paired with the hook (loop) and loop (loop) configuration, but dry adhesive fastening system according to an embodiment of the present invention is a hook and loop configuration The present invention relates to a fastening system of a new concept using van der Waals forces due to the contact of fine cilia which does not require the distinction between hook and loop parts.

In addition, the dry adhesive fastening system according to an embodiment of the present invention can not only reduce the nano-sized dimensions that can be adhered without losing the fastening force, but also different hooks and loops for adhesion, unlike conventional Velcro fastening systems. It is not necessary and can be bonded in the same pair.

1 is a schematic diagram for explaining a dry adhesive fastening system according to an embodiment of the present invention.

Referring to FIG. 1, a dry adhesive fastening system according to an embodiment of the present invention includes a first adhesive member 100 and a second adhesive member 200.

In detail, the first adhesive member 100 includes a first substrate 110 and a first micro-cilia 120 formed on the first substrate 110. The second adhesive member 200 also has a similar shape, and the second micro fine fibers formed on the second substrate 210 to show adhesive strength in contact with the second substrate 210 and the first micro fine fibers 120 ( 220).

Existing Velcro system is a pair of adhesive members of different shapes, such as hooks and loops are fastened in a mechanical manner, but the present invention provides two adhesive members having the same or similar shape, that is, micro-cilia are formed. It is a way of contacting each other. Therefore, the first adhesive member 100 including the first substrate 110 and the first fine cilia 120 and the second adhesive member 200 including the second substrate 210 and the second fine cilia 220. May have the same shape as each other. That is, the length, aspect ratio, thickness, and the direction formed with respect to the substrate of the micro cilia may be different from each other, but in terms of using the micro cilia, the shapes of the two adhesive members bonded to each other are the same.

The first and second fine cilia 120 and 220 are micro or nano-sized fine cilia structures, and preferably have a cilia shape having the same diameter.

In addition, the first substrate 110 of the first adhesive member 100 and the second substrate 210 of the second adhesive member 200 may be made of various materials, but by imprint lithography, capillary force lithography, or the like. It is preferable to use a polymer resin having a flexible property capable of forming fine cilia. For example, the first substrate 110 and the second substrate 210 may be manufactured using a polyethylene terephthalate (PET) material.

In addition, the first micro fine fibers 120 of the first adhesive member 100 are formed on the first substrate 110. The first fine cilia 120 may be formed in a direction perpendicular to or inclined with respect to the first substrate 110. However, when formed to be inclined, it is preferable that the adhesive members which are in contact with each other are in contact with each other in the direction parallel to each other micro fine cilia. Therefore, it is better to select both adhesive members in consideration of the inclined direction.

On the other hand, when the first micro fine filament 120 and the second micro fine filament 220 are formed in the vertical direction with respect to the first substrate 110 and the second substrate, respectively, a force is applied to the first substrate in the vertical direction. Contact with the second adhesive member enables adhesion. Therefore, as long as the structure is in contact with each other in a state in which the objects to be bonded are in parallel with each other, it is practical to form the fine cilia in the direction perpendicular to each substrate.

The greater the number of the first micro-cilia 120 and the second micro-cilia 220 per unit area of the first substrate 110 and the second substrate 210, respectively, the better the adhesive strength. That is, the higher the density of the formed microcilia, the greater the van der Waals force due to the contact between the microcilia, the adhesion is improved. Therefore, it is possible to adjust the formation density of the fine cilia according to the environment in which the dry adhesive fastening system according to the present invention is used.

The van der Waals force is precisely when the first adhesive member 100 and the second adhesive member 200 are adhered to each other in the dry adhesive fastening system of the present invention, the first fine cilia of the first adhesive member 100 ( It occurs when the 120 and the second fine cilia 220 of the second adhesive member 200 are bonded to each other. Specifically, when the ends of the first micro-cili 120 and the second micro-cili 220 are bonded to each other or additional pressure is applied, the first micro-cili 120 and the second micro-cili 220 are mutually It occurs when the sides of both cilia come into contact with each other when they become a shape to be fitted (engaged).

In this way, in order to increase the van der Waals force providing the adhesive force in the present adhesive system, it is preferable to widen the contact area between the first micro fine filament 120 and the second fine cilia 220. Therefore, if the contact area is increased by applying pressure to the first substrate or the second substrate so that the first micro-cilia 120 and the second micro-cilia 220 are fitted to each other (engaged shape). Strong adhesion can be achieved.

In addition, the first adhesive member 100 and the second adhesive member 200 bonded as described above have little noise when detaching as compared to the conventional Velcro bonding system, and can be detached very easily using a small force.

This will be described in detail with reference to the accompanying drawings.

2 and 3 are schematic diagrams for explaining the adhesion of the dry adhesive fastening system according to an embodiment of the present invention, Figure 4 is a schematic diagram for explaining the detachment of the dry adhesive fastening system according to an embodiment of the present invention. .

Referring to FIG. 2, the dry adhesive fastening system according to an embodiment of the present invention first performs an operation of adhering the first adhesive member 100 and the second adhesive member 200 for adhesion. At this time, the first micro-cilia 120 and the second micro-cilia 220 of the first adhesive member 100 and the second adhesive member 200 are made of a myriad of fine micro-structures having the same arrangement, each other In order to prevent the microstructures having the same arrangement from being crushed, that is, the first microcilia 120 and the second microcilia 220 are bonded to each other while crossing each other.

Referring to FIG. 3, even when a strong shear stress is applied to the first adhesive member 100 and the second adhesive member 200, the first adhesive member ( 100 and the second adhesive member 200 are not detached. Moreover, in the process of applying the shear stress, the side of the first fine cilia 120 is in close contact with the side of the second fine cilia 220, so that the adhesion is further improved and thus can withstand the strong pressure.

Through this process, the first adhesive member 100 and the second adhesive member 200 are bonded while having a high tensile strength.

4 is an image taken with an electron microscope of a state in which the first adhesive member and the second adhesive member are bonded to the dry adhesive fastening system according to an embodiment of the present invention. Referring to FIG. 4, it was confirmed that adhesion was maintained while maintaining the van der Waals force induced up to 38N / cm 2 under a condition of 50% relative humidity.

Figure 5 is a schematic diagram for explaining the detachment of the dry adhesive fastening system according to an embodiment of the present invention.

Referring to FIG. 5, an operation for detaching the first adhesive member 100 and the second adhesive member 200 bonded as described above may be performed by applying a predetermined force to one end of the second adhesive member 200. 1 The process of removing from the adhesive member 100 is performed. That is, when one end portion of the second adhesive member 200 (or the first adhesive member 100) is pulled in the upper direction instead of the lateral direction, the adhesive is released at the same time as the A portion to release the second adhesive member. 200 is detached from the first adhesive member 100.

In one embodiment, the first adhesive member 100 and the second adhesive member 200 adhered to each other while maintaining the van der Waals force induced up to 38 N / cm 2 need only be 0.02 N / cm 2 for detachment. By using very little force it could be confirmed that the detachment is possible.

As described above, the dry adhesive fastening system according to one embodiment of the present invention bonds the first adhesive member 100 and the second adhesive member 200 using van der Waals forces, thereby improving the adhesive force. Looking at it as follows.

The adhesive force between the first fine cilia 120 of the first adhesive member 100 and the second micro cilia 220 of the second adhesive member 200 may be confirmed by measuring tensile strength.

The tensile strength increases as the diameters of the first and second fine cilia 120 and 220 become small, the aspect ratio increases, and the density of formation of the cilia increases. Accordingly, the dry adhesive fastening system of the present invention can increase the tensile strength by reducing the diameter of the microciliary structure, increasing the aspect ratio, or increasing the density.

In addition, in order to adjust the adhesive force, the surface of the first microcili and the second microcili may be subjected to a constant treatment. For example, using a tridecafluoro-1,1,2,2-tetrahydrooctyl-trichlorosilane (tridecafluoro-1,1,2,2-tetrahydrooctyl) -trichlorosilane) and the like self-assembled monolayer ( Self Assembly Monolayer (SAM) may be added, or a metal coating or polymer coating may be added.

Methods for increasing the above-described tensile strength can be confirmed through experiments. Figure 6 is a view showing the experimental conditions for confirming the tensile strength of the dry adhesive fastening system according to an embodiment of the present invention, Figures 7 to 12 are fine cilia of the dry adhesive fastening system according to an embodiment of the present invention It is a graph to explain the correlation between the tensile strength according to the size (thickness of fine cilia), aspect ratio, density, and pressure of the structure.

Referring to Figure 6, the experimental conditions for checking the tensile strength is placed in the center of the pulley (3) in the prepared state of the prepared bonding system, using a wire to connect the weight (4) and the adhesive member (1) located at the top I was. Using this method, the shear stress (y-axis) of the portion where the adhesive member 1 located in the upper part and the adhesive member 2 located in the lower part was compared according to the weight (x axis) of the weight. Shear stress under each condition was compared and tested by dividing the contact member into a surface-plane, micro-seam-plane, and micro-cili-fine cilia, respectively.

7, 9, and 11 are photographic diagrams showing the shapes of the fine cilia. 7, 9, and 11, the microciliates shown in each of the figures increase in length, aspect ratio, and density of the microciliates in the order of FIG. 7 <FIG. 9 <FIG. 11. It can be seen that the thickness (diameter) is FIG. 7> FIG. 9> FIG. 11.

8, 10, and 12 are graphs showing results of experiments using the micro-cilia of FIGS. 7, 9, and 11, respectively.

At this time, as a pair of adhesive members 1 and 2 in contact with each other, when a flat adhesive member is not formed with fine cilia (surface-plane; FIGS. 7 and 8), the flat adhesive member and the present invention are used. In the case of using the adhesive member formed with the micro-cili according to an embodiment of the present invention (face-fine cilia; Fig. 9, Figure 10), in the case of using a pair of the adhesive member formed with the micro-cili according to an embodiment of the present invention (fine Shear stress of cilia-fine cilia; FIGS. 11 and 12) was compared. In the case of FIG. 7, the shear stress is the best in the case of surface-to-face contact, but in the case of FIGS. 9 and 11, it is confirmed that the shear stress is the best in the microcili-microciliary contact as the weight of the weight increases.

Through these experiments, it is possible to check the correlation between the tensile strength according to the size, aspect ratio, density, and pressure of the microciliar. Looking at the conclusions drawn through the experiment, the first microciliar 120 and the second It can be seen that the smaller the diameter of the micro-cilia 220, the larger the aspect ratio, the higher the density, the higher the shear stress and the tensile strength.

In addition, the dry adhesive fastening system according to an embodiment of the present invention is a UV polymer, such as polyurethane acrylate (PUA: Poly Urethane Acrylate), polystyrene (PS) for the first microcilia 120 and the second microcilia 220 It may be preferable to form a polymer such as an acrylic resin such as PolyStyrene polymer or polymethyl methacrylate (PMMA).

The first micro-cilia 120 and the second micro-cilia 220 formed of the material as described above are preferably manufactured by a method such as nanoimprint lithography or capillary force lithography. In addition, any method can be used as long as it is possible to make small structures.

For example, the nanoimprint lithography is known as a representative method for forming microstructures. According to this method, a small structure of several tens of nanometers can be made by using a mold having a high strength.

Looking at the method of using the dry adhesive fastening system according to an embodiment of the present invention configured as described above are as follows.

13 is a schematic flowchart illustrating a method of using a dry adhesive fastening system according to an embodiment of the present invention.

Referring to FIG. 13, in the method of using the dry adhesive fastening system of the present invention, first, a first adhesive member 100 having a first fine cilia 120 formed on the first substrate 110 is prepared (S100). Subsequently, the second micro fine filament 220 formed on the second substrate 210 is brought into contact with the first micro fine filament 120 to show adhesive strength with the first micro fine filament 120 (S200).

In step S200, the adhesive force may be controlled by adjusting the force applied when the first microciliton 120 and the second microciliar 220 are in contact with each other. In addition, the diameter of the first fine cilia 120 or the second fine cilia 220, or the first fine cilia 120 or the second fine formed on the first substrate 110 and the second substrate 210, respectively The adhesive force may be adjusted by adjusting the density of the cilia 220 or the aspect ratio of the first microcili 120 or the second micro cilia 220.

Subsequently, in order to detach the adhered first adhesive member 100 and the second adhesive member 200, a part of the first substrate 110 and the second substrate 210 to be adhered are separated from each other, particularly one end thereof. The first adhesive member 100 and the second adhesive member 200 may be separated. That is, when one end of the first substrate 110 and the second substrate 210 are bonded to each other in the manner shown in FIG. 4, the first adhesive member 100 and the second adhesive member may be adhered to each other even with a very small force. The member 200 may be separated.

While the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (13)

A first adhesive member having a first fine cilia formed on the first substrate; And Dry adhesive fastening system comprising a second adhesive member having a second fine cilia formed on a second substrate in contact with the first fine cilia to exhibit an adhesive force The dry adhesive fastening system according to claim 1, wherein the first and second fine cilia are micro or nano size. The dry adhesive fastening system of claim 1, wherein the first substrate and the second substrate comprise a PET substrate. The dry adhesive fastening system according to claim 1, wherein the adhesive force between the first and second fine cilia is a attraction force due to van der Waals force. The dry adhesive fastening system according to claim 1, wherein the first and second fine cilia comprise an ultraviolet curable resin. The dry adhesive fastening system of claim 1, wherein the first and second fine cilia are formed in a direction perpendicular to the first substrate and the second substrate, respectively. The dry adhesive fastening system according to claim 1, wherein the surfaces of the first and second fine cilia are surface treated to control the adhesive force. Preparing a first adhesive member having a first fine cilia formed on the first substrate; And And contacting the second microcilia formed on the second substrate with the first microcilia so as to exhibit adhesive force with the first microcilia. 10. The method of claim 8, wherein the adhesive force is controlled by adjusting a force applied when the first and second fine cilia are in contact with each other. 10. The method of claim 8, wherein the adhesive force is adjusted by varying the size of the diameter of the first or second fine cilia. The method of claim 8, wherein the adhesive force is controlled by varying the density of the first or second fine cilia formed on the first and second substrates, respectively. 10. The method of claim 8, wherein the adhesive force is controlled by adjusting an aspect ratio of the first or second fine cilia. The method of claim 8, After the step of contacting the first and second microcilia, And separating the first adhesive member and the second adhesive member by separating a portion of the first substrate and the second substrate from each other.

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