KR101642892B1 - Nonslip pad and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a slip preventing pad and a manufacturing method thereof. The slip preventing pad is capable of improving convenience for construction and improving a product usage environment by clearly indicating ends of steps by forming a bending groove enabling a pad to be bent according to an installation environment to be accurately bent along a bending line and inputting a luminous substance into the bending groove. The present invention relates to the slip preventing pad (1) including the steel or stainless metal pad (30) and a slip preventing surface (35) regularly formed on at least a part of the metal pad (30). The bending groove (39) is formed on one side of a top surface of the metal pad (30) in the longitudinal direction of the metal pad (30). A rust preventative substance (50) is filled inside the bending groove (39), thereby continuously covering the surface of the bending groove (39) after a top part (37) and a lateral part (38) of the metal pad is bent in a direction that the bending groove (39) is widened along the bending groove (39).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-slip pad,

The present invention relates to a non-slip pad, and more particularly, to a non-slip pad, which is formed with a bending groove that can be bent accurately along a bending line of a pad that must be bent according to an installation environment, The present invention relates to a non-slip pad and a method of manufacturing the same.

The edges of the stairs are equipped with various pads to prevent slippage. These pads are manufactured by bending a metal plate to form irregularities, or by forming a rubber pad having irregularities on a metal plate, or attaching high-hardness particles on the pad to prevent slippage .

The non-slip pad, which is formed by simply bending the metal plate, is deformed or worn easily due to the continuous load applied thereto, and if it is flattened by deformation and abrasion, it is no longer slip-resistant. There is a problem that it becomes more slippery. In the case of a rubber pad having unevenness, the rubber pad can not withstand a long time and is quickly worn out. Therefore, the rubber pad has to be frequently replaced. When the irregularities are thus formed, dust or dirt is inserted into the gaps between the irregularities so that the irregularities become dirty.

Non-slip pads with high-hardness particles attached to the pad to prevent slippage, because the tip of the hard particles are sharp, the object or person directly touches this area and causes friction. There is a problem that scratches are formed and the skin is damaged. High hardness particles are very difficult to manufacture in a round shape without sharper sharpness because they are difficult to process, and they are very uneconomical because they are expensive to manufacture even if they are produced in this way.

In addition, the high hardness particles themselves are not abradable and can be excellent in abrasion resistance. However, there is a problem that when the binder fixing the high hardness particles is weakened or destroyed, the particles themselves are completely removed. Conventional non-slip pads utilizing carbide particles, such as tungsten carbide, have the same problem that they melt relatively soft metal rather than tungsten carbide because they can not fix tungsten carbide directly on a heterogeneous metal pad It is due to the fact that it is made by embedding carbide particles such as tungsten carbide in it. In other words, tungsten carbide itself is a carbide particle having high abrasion resistance, but it is encouraging to use it as a material of a non-slip pad exposed to frequent friction. However, it is dangerous because there are many sharp surfaces, and when the structure for holding the tungsten carbide is weakened, it is dropped Has a limitation in productivity due to problems such as points.

On the other hand, the anti-slip pads are installed side by side on the edge of the stairs, but the conventional anti-slip pads are generally installed only on the upper edge of the stairs. However, when the anti-slip pad is provided only on the upper surface of the corner, it is another operation to catch the installation position, and when the side surface of the anti-slip pad receives an external impact to the side, the pad is separated from the stairs .

Also, in the case of a non-slip pad which covers both the upper and side surfaces of the corners of the stairs, the angles formed by the edges of the stairs may vary from site to site, so it is difficult to bend the anti- . Particularly, in the field of bending work, it is difficult to fit the bending line, and the bending of the non-slip pad and the non-slip surface formed thereon are difficult to overcome. In addition, the anti-slip pad is usually rust-proofed on the surface of the anti-slip pad in order to prevent corrosion or rusting of the anti-slip pad. In the field of bending, the rust- Dover Linda has a problem.

Korean Patent Registration No. 144210 Japanese Patent Application Laid-Open No. 1997-69218 Registration Utility Model No. 196108 Korean Patent Registration No. 778652

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the problems described above, and it is an object of the present invention to provide a metal pad which is free of sharpness and can be used for a long period of time A non-slip pad is provided.

It is another object of the present invention to provide a non-slip pad which can easily bend in the field and does not break the rust-preventive structure of the bent portion even after the bending operation.

It is another object of the present invention to provide a method for easily manufacturing the non-slip pad.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an electronic device comprising: an iron or stainless steel metal pad; And a non-slip surface (35) provided at regular intervals on at least a part of an area of the metal pad (30), characterized in that the non-slip pad (1) A ridge 39 is formed in the bending groove 39 and a rust preventing material 50 is filled in the bending groove 39 so that the upper surface 37 of the metal pad 37 And the side surface portion 38 and the side surface portion 38 of the metal pad 40. The surface of the bending groove 39 where the material filled in the bending groove 39 is continuously applied is maintained, The metal balls 20 of the same material as the metal balls 20 are formed by thermally fused portions W on the upper surface of the metal pad and the metal balls adjacent to each other and are fixed to each other, Fused neighboring metal balls and the metal balls The adjacent metal balls and the metal balls which are in contact with the metal balls are partially overlapped by the heat welded portion w of the metal pads in contact with each other, And the air gap portion S is provided in a non-sealed state.

The rustproofing material 50 filled in the bending groove 39 is a viscous material filled at least above the height of the upper surface of the metal pad 30, (50) includes a light emitting material.

The non-slip pad is characterized in that the metal balls 20 have a diameter of 0.5 mm to 1.2 mm.

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The depth of the portion w to be superimposed by thermal fusion from the surface between the metal balls and the surface between the metal balls and the metal pad in contact with the metal balls is 0.02 mm to 0.15 mm.

According to another aspect of the present invention, there is provided a method of manufacturing the anti-slip pad, comprising: forming a bending groove (39) on one side of the iron or stainless metal pad (30) Applying a binder (40) to an area of the metal pad (30) where an anti-slip surface (35) is to be formed; The metal balls 20 having the same material as the metal pad are poured on the metal pad 30 coated with the binder 40 so that the metal balls 20 are densely adhered to the portion to which the binder 40 is applied step; Densely collecting the metal balls (20) attached to the binder (40) while removing the binder (40); And the metal balls (20) and the metal pads are heat-welded at their contact points, and the heat-welded neighboring metal balls and the heat-welded portion (w) of the metal pads in contact with the metal balls , The neighboring metal balls and the metal balls and the metal pads in contact with each other are partially overlapped with each other so that the gap S is provided between the metal balls and the metal pad in a mutually thermally fused state so as to be in an unsealed state The method of manufacturing a non-slip pad according to claim 1,

The welding step may include pressing the metal balls 20 at the upper portion and electrically connecting the first electrode to the upper portion of the metal ball and the second electrode to the lower surface of the metal pad facing the non-slip surface 35 And the adjacent metal balls 20 and the metal pad surface are electrically welded to each other by welding.

In the step of removing the binder, the binder 40 is volatilized or burned by heating the binder 40 to remove the binder.

And further comprising a step of rust-proofing at least the bending grooves (39) after the heat-welding step by the welding.

According to the present invention, a bending groove can be formed on the upper surface of the metal pad so that the bending can be performed at an accurate position, and the rust prevention is continuously maintained at the portion where plastic deformation occurs due to bending after bending.

According to the present invention, the anticorrosive material applied to the bending portion has antirust function as well as luminescence (fluorescence, luminous flux, luminous luminous flux, etc.) so that the edge portion of the staircase Can be guided very precisely.

In addition, since the non-slip surfaces formed in the form of the balls being concentrated are formed on the non-slip pad, the non-slip effect can be enhanced without being sharp.

In addition, the metal balls constituting the non-slip surfaces and the metal pads are made of the same material, and they are welded to each other by heat welding, so that the metal balls exhibiting the anti-slip effect are fixed very firmly and surely prevented from falling off the anti- .

In addition, since the metal balls having relatively uniform shape and size are welded at the mutual contact points, it is possible to sufficiently secure the number of welding points as well as to uniformly distribute the welding points, thereby greatly increasing the bonding force of the metal ball have.

In addition, when the metal balls are welded to each other at the contact points, since the balls are substantially spherical in shape, it is possible to sufficiently absorb the deformation by the air gap when the metal material is deformed by the heat by securing the air gap between the metal balls, It is possible to prevent the bonding force of the contact portion from being weakened or broken.

Further, according to the present invention, it is possible to manufacture a non-slip pad by a relatively simple process without a complicated process, so that the productivity is very high and the cost can be reduced.

In addition, according to the present invention, since the process of heating in the preceding binder removal process increases the workability of the resistance welding which follows, the airflow can be further reduced.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a perspective view of a non-slip pad according to the present invention,
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1,
FIG. 3 is a view showing a state in which a binder is applied to an area where an anti-slip surface is to be formed on a metal pad,
FIG. 4 is a view showing a state where a plurality of metal balls are placed on a metal pad of FIG. 3 and attached to a binder;
FIG. 5 is a view showing a state in which the binder of FIG. 4 is closely adhered to the metal balls attached to the binder while the binder is vaporized by heating the metal pad;
FIG. 6 is a view showing a state in which the metal balls of FIG. 5 are pressed against the metal pad surface and the center of the non-slip surface,
7 is a view showing a state in which the surfaces of the metal balls which are in contact with each other and the upper surface of the metal pad are thermally fused,
8 is a sectional view taken along line BB of Fig. 1, and
FIG. 9 is a view showing a state where the anti-slip pad of FIG. 8 is bent along a bending groove.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

FIG. 1 is a perspective view of a non-slip pad according to the present invention, and FIG. 2 is a cross-sectional view taken along line A-A of FIG. 7 is a portion showing a larger portion of FIG. 2, and therefore, FIG. 7 can also be referred to together.

The non-slip pad 1 of the present invention has a non-slip surface 35 at a predetermined position on the metal pad 30 as shown in FIG. The non-slip surface 35 may be provided over the entire area of the metal pad, but by forming the non-slip surface in several places as shown in the figure to the extent that the person does not slip when moving up and down the stairs, It is more preferable that at least three non-slip surfaces are included in the foot area of a person when the user touches the anti-slip pads so that the anti-slip effect is sufficiently achieved.

The material of the metal pad 30 may be, for example, iron or stainless steel. Bending grooves 39 are formed in the upper surface of the metal pad 30 along the longitudinal direction and the rubbing grooves 39 are filled with a rust preventive material 50 containing a light emitting material.

A plurality of metal balls 20 are fixed to each other in a densely packed manner in the area of the metal pad 30 which becomes the non-slip surface 35. The metal ball 20 is made of a material having a sufficient welding strength when welded to the metal pad 30, and may be made of the same material as the metal pad 30, for example. Between the metal ball 20 and the metal pad 30 and between the neighboring metal balls 20 are welded to each other at their contacts.

Particularly, since all the metal balls 20 are in the form of balls, the area of the contact points between adjacent metal balls is considerably wide from a microscopic viewpoint, and the mutual bonding force can be sufficiently secured. In addition, since all of the uniform ball-shaped metal balls are adjacent to each other and are welded to each other at their contacts, when viewed from the position of one metal ball, at least three positions are welded to adjacent metal balls or metal pads . In particular, since one metal ball may be welded at 10 or more positions, it can be said that the metal balls fixed on the metal pad are tightly connected and fixed to each other.

Since the present invention is of such a shape that the small diameter metal balls are densely fixed, the upper surface of the non-slip surface 35 becomes a very rugged shape, which provides a non-slip effect. Of course, it should also be noted that each projection is rounded and therefore not sharp.

That is, according to the present invention, since the welding is performed for each contact point in a state in which the substantially spherical metal balls are densely arranged to each other, the number of welding points between neighboring balls can be sufficiently secured and the slip- . This also has the effect of sufficiently securing the gap portion S to be described later.

On the other hand, if metal fragments of very irregular shape and size are used, it is difficult to ensure that all metal fragments are tightly held together even if they are welded together at their contacts, and sharp parts may be exposed to the upper side of the anti- have.

In addition, since the present invention attaches them to each other at the contact point between the metal balls and the metal pad, the gap S is generated between the balls. According to the present invention, this gap S between the metal balls and between the metal ball and the metal pad remains unsealed. That is, since the air gap S has a structure in which air can pass through, moisture present in the air gap portion is easily dried, thereby preventing water from being generated on the non-slip surface, thereby preventing rust. In addition, the metal balls repeatedly expand or contract due to changes in the temperature due to seasonal changes. The air gap portion (S) serves as a buffer for such expansion or contraction, It is possible to prevent a phenomenon in which the coupling between the electrodes is weakened or broken. On the other hand, as described above, when irregularly shaped metal fragments are used, not only the void portion S can not be secured sufficiently, but the length of the thermal deformation along the irregular shape changes depending on the deformation direction. There is a problem that the weakening phenomenon can not be prevented.

The diameters of the metal balls 20 are preferably constant, and it is preferable to use balls having diameters in the range of at least 0.5 mm to 1.2 mm. When the diameter of the metal ball is less than 0.5 mm, the area of the whole contact point between the metal balls constituting the anti-slip surface and the metal pad is too wide, resistance welding is not easily generated, and the curvature protruding to the upper portion of the non- The slip prevention effect becomes weak. On the other hand, when the diameter of the metal ball is larger than 1.2 mm, the number of welding points per unit area of the non-slip surface decreases, while the size of one metal ball becomes larger, Of course, when the impact force is concentrated, there is a possibility that the metal ball will fall off.

It is preferable that a depth of heat fusion between the surface of the metal balls adjacent to each other and the surface between the metal balls and the metal pad in contact therewith is about 0.02 mm to 0.15 mm. That is, the portions where the two surfaces are fused when mutually fused and overlap each other (that is, the w portion in FIG. 7) is about 0.02 mm to 0.15 mm. If the fusing depth is less than 0.02 mm, it is difficult to secure the area of the contact, and the bonding force becomes low. If the fusing depth is too deep, the fusing protruding to the upper portion of the slip prevention surface is weakened, I will not. Such fusion depth can be controlled by adjusting the amount of current applied to the resistance welding to be described later.

In addition, the non-slip surface 35 may be rust-proofed. For example, when stainless steel is used as a metal material, it does not cause corrosion such as rust. However, since the non-slip surface portion can not completely eliminate the concern that some rust will start at the welded portion or the like, So that the binding force of the metal ball is weakened, so that the metal ball can not fall off.

Next, matters related to the bending of the anti-slip pad 1 will be described in detail. FIG. 8 is a sectional view taken along the line B-B in FIG. 1, and FIG. 9 is a view showing a state in which the anti-slip pad of FIG. 8 is bent along the bending groove. As shown in the figure, a bending groove 39 is formed at one side of the anti-slip pad.

The bending groove 39 is formed along the longitudinal direction of the non-slip pad 1 as shown in FIG. 1, and the rust preventing material 50 is coated in the bending groove 39. 8, the internal angle of the bending groove 39 is an acute angle smaller than 90 degrees. 9, the angle formed by the bent groove 39 after the folding may be less than 180 degrees, that is, in the case where the concave shape 39 is formed in the concave shape .

The rust preventive material 50 filled in the bend grooves 39 is a completely solidified viscous body and the rust preventive material 50 is well adhered to the inner surface of the bend grooves 39. Even if the bending groove 39 is bent as shown in FIG. 9, the rust preventive material 50 still remains in a state of being applied to the bent groove 39 in a state of being attached to the inner surface of the bending groove 39 do. The reason why the internal angle of the bending groove 39 before bending is an acute angle is largely related to the preservation of the state of the anticorrosive material 50. Even after bending, the bending groove 39 has an angle of less than 180 degrees, It is possible to minimize the degree of stretching of the viscous rust preventing material 50, thereby preventing the rust-preventive material from being broken, and also enabling the rust-preventive substance to be kept thickest at the center portion. Since the central part of the bending groove (the deepest part of the bending part) is the area where plastic deformation occurs the most, the rust prevention of the corresponding area must also be made thicker. Even after bending, the central part of the bending groove 39 has an angle of less than 180 degrees, , The rust prevention of the central part becomes the thickest.

In addition, the present invention can make such a rust preventive substance further include a luminescent substance. When the anticorrosive material includes the light emitting material, even if the anticorrosive material is used without being bent as shown in FIG. 8, since the light emitting material is applied along the bending groove 39, the vicinity of the edge of the staircase is well displayed In the case of bending as shown in Fig. 9, it has the effect of accurately displaying the vicinity of the edge of the staircase. The luminescent material may be a material that emits light that has been phosphorescent when it emits light in a bright environment and becomes a fluorescent material in a dark environment. That is, the luminescent material has a function of visually marking its position in the eye.

According to this construction of the present invention, since the rusting of the bent portion and the visual indication of the corner portion of the stairs are performed at once, it is not necessary to break the rustproofing or perform a separate process for displaying the corner portion.

Hereinafter, a method of manufacturing the non-slip pad will be described in detail.

FIG. 3 is a view showing a state in which a binder is applied to an area where a non-slip surface is to be formed on a metal pad, FIG. 4 is a state in which a plurality of metal balls are mounted on the metal pad, FIG. 5 is a view showing a state in which the binder of FIG. 4 is heated by heating a metal pad and the metal balls attached to the binder are closely adhered while the binder is vaporized. FIG. 6 is a cross- FIG. 7 is a view showing a state in which the surfaces of the metal balls contacting each other and the upper surface of the metal pad are thermally fused. FIG.

3, an iron or stainless steel metal pad 30 is prepared and a binder 40 is coated on the area of the metal pad 30 where the non-slip surface 35 is to be formed. The binder 40 is somewhat viscous and does not flow or spread to the periphery from the applied position, and temporarily supports the metal balls 20.

Next, the metal balls 20 are poured on the metal pad 30 on which the binder 40 is applied, so that the metal balls 20 are densely adhered to the portion to which the binder 40 is applied. That is, when the metal balls 20 are poured on the metal pad 30 as shown in FIG. 3 and the metal balls 20 are pressed on the upper surface of the metal pad 20, And is adhered and supported by the binder 40. When the metal balls 20 are attached to the binder 40 and the remaining metal balls are removed, the state shown in FIG. 4 is obtained.

Then, the binder 40 is removed. Removing the binder 40 does not mean that the binder 40 is simply removed, but removes the remaining components of the binder 40 except for the components involved in the adhesion of the metal balls, and burns or removes the components. For example, when using the volatile binder 40, the volume of the binder 40 gradually decreases over time, so that the metal balls 20 attached to the binder 40 gather more densely (see FIG. 5). It is also possible to densely collect the metal balls 20 attached to the binder 40 while reducing the volume of the binder 40 even in a method of heating and burning the binder 40. In particular, when the binder 40 is heated regardless of the volatility characteristics or the combustion, the temperature of the metal ball 20 and the metal pad 30 in the vicinity thereof also increases considerably. This allows better resistance welding. That is, as the temperature of the metal increases, the resistance tends to increase accordingly. The above-described heating process not only eliminates the binder but also ensures that the resistance welding to be performed immediately after is performed.

Next, as shown in Fig. 6, the metal balls and the metal pads are resistance welded so that they are heat-welded at their contacts. Resistance welding uses the principle that high temperature is generated at a region where resistance flows as current flows. The amount of heat generated becomes larger as the amount of current flowing and the resistance increase. However, since the metal balls and the metal pads are heated to some extent in the process of removing the binder in the previous step and the residual binder increases the electrical resistance between the adjacent metal balls, The resistance can be sufficiently secured even if the number of the electrodes is large.

The first pole energizing pressing member 61 as shown in the drawing is pressed against the metal pad 20 at the upper portion and toward the metal pad surface and the metal balls are pressed toward the center of the non-slip surface And a concave portion, the edge of which has a curved surface. As described above, the first electrode (+) is formed on the upper portion of the metal ball through the first pole energizing pressing member 61, and the lower surface of the metal pad facing the non-slip surface 35 via the second pole energizing member When the second electrode (-) is electrically connected and energized, high-temperature heat is generated at the contact points of the metal balls 20 and the metal pad 30, which are relatively high in resistance, and they are welded or thermally fused .

As described above, since the non-slip pad of the present invention is welded while closely contacting balls of substantially uniform diameter and shape on the non-slip surface, the particles of one ball 20 are positioned at three different positions And the gap S can be ensured to some extent (see Fig. 7).

If necessary, the work for rust-proofing the non-slip surface 35 after the welding operation can be further carried out.

Meanwhile, the bending groove 31 may be formed by extruding the metal pad 30 in a longitudinal direction by a roll or the like, or may be molded separately after the metal pad 30 is formed. Alternatively, You may.

It is preferable that the operation of filling the bending groove 39 with the rust preventive material is performed after the fusion of the metal balls is completed, thereby preventing heat generated by resistance welding of the metal balls from causing denaturation of the rust preventing substance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed exemplary embodiments. It is obvious that a transformation can be made. Although the embodiments of the present invention have been described in detail above, the effects of the present invention are not explicitly described and described, but it is needless to say that the effects that can be predicted by the configurations should also be recognized.

1: Non-slip pad
20: Metal ball
30: metal pad
35: Non-slip surface
37: upper surface portion
38:
39: Bending groove
40: binder
50: Antirust material (including luminescent material)
61: first pole energizing pressing member
62: second pole current carrying member
S:
W:

Claims (8)

An iron or stainless steel metal pad 30; And a non-slip surface (35) provided in a regular arrangement in at least a partial area on the metal pad (30)
A bending groove 39 is formed on one upper surface of the metal pad 30 along the longitudinal direction of the metal pad 30. The bending groove 39 is filled with a rust preventive material 50,
The upper surface portion 37 and the side surface portion 38 of the metal pad are bent in the direction in which the bending groove 39 extends along the bending groove 39 and then the bending groove 39 in which the material filled in the bending groove 39 is bent ) Surface is maintained in a continuously applied state,
The metal balls 20 of the same material as the metal pads are fixed to the upper surface of the metal pad adjacent to the metal pad and the metal balls and are fixed to each other at the portion of the non-slip surface 35, A heat-welded portion is formed at a position more than a position,
The metal balls adjacent to each other and the metal pads in contact with the metal balls are partially overlapped by the heat-welded neighboring metal balls and the heat fusion portion (w) of the metal pads in contact with the metal balls ,
Wherein a gap (S) is provided between the metal balls and the metal pad in a state where the metal balls are mutually thermally fused, thereby becoming unsealed.
The method according to claim 1,
The internal angle of the bending groove 39 before bending is an acute angle,
The rust preventive material 50 filled in the bending groove 39 is a viscous material filled at least above the height of the upper surface of the metal pad 30,
Wherein the rustproofing material (50) comprises a light emitting material.
The method according to claim 1,
Wherein the metal balls (20) have a diameter of 0.5 mm to 1.2 mm.
The method according to claim 1,
A depth of a portion w to be superimposed by thermal fusion from a surface between the adjacent metal balls which are thermally welded and a surface between the metal balls and the metal pad in contact therewith is 0.02 mm to 0.15 mm The non-slip pad.
A method of manufacturing a non-slip pad as claimed in any one of claims 1 to 4,
Forming a bending groove (39) on one side upper surface along the longitudinal direction of the iron or stainless steel metal pad (30);
Applying a binder (40) to an area of the metal pad (30) where an anti-slip surface (35) is to be formed;
The metal balls 20 having the same material as the metal pad are poured on the metal pad 30 coated with the binder 40 so that the metal balls 20 are densely adhered to the portion to which the binder 40 is applied step;
Densely collecting the metal balls (20) attached to the binder (40) while removing the binder (40); And
The metal balls 20 and the metal pads are subjected to resistance welding so that the metal balls 20 and the metal pads are thermally fused at the contact points of the metal balls 20 and the metal pads, The adjacent metal balls and the metal balls and the metal pads in contact with each other are partially overlapped with each other so that the gap S is formed between the metal balls and the metal pad in a mutually thermally fused state so as to be in an unsealed state Wherein the step of forming the anti-slip pad comprises:
The method of claim 5,
The welding step comprises pressing the metal balls (20) at the top and electrically connecting the first electrode to the top of the metal ball, the second electrode to the bottom surface of the metal pad facing the non-slip surface (35) Wherein the adjacent metal balls (20) and the metal pad surface are welded to each other by thermal fusion.
The method of claim 5,
Wherein the binder (40) is volatilized or burned by heating to proceed with the removal of the binder.
The method of claim 5,
Wherein at least the bending grooves (39) are rust-proofed after the heat-sealing.

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