KR101536470B1 - Metal foil - Google Patents

Abstract

More particularly, the present invention relates to a metal foil whose occurrence of burrs is minimized on a cut surface cut through shearing. The metal foil is a metal foil having a thickness (t) of 2 to 300 μm , Said metal foil having a cutting face cut by shearing, said cutting face being located at the top of the cutting face in the thickness direction, and having an upper end face having a cutting edge; A lower end surface located at a lower end of the cut surface and having a cutting edge; And a foil having a fracture surface existing between the upper end face and the lower end face. The present invention also provides a method of manufacturing a metal foil, comprising: shearing at least a portion of a metal foil thickness by pressing one surface of the metal foil with a cutting edge; Stressing the metal foil by the cutting edge to fracture a portion of the remaining portion of the remaining metal foil thickness; And a step of pressing and deforming the remainder of the metal foil by means of the cutting edge so as to cut the metal foil.

Description

METAL FOIL < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cut metal foil and a method of cutting the metal foil, and more particularly, to a metal foil cutting method for minimizing the occurrence of burrs on a cut surface cut through shearing .

Recently, metal foil has been increasingly used as electronic and energy related parts. For example, substrates, support plates, protective films, sealing materials, and the like. The metal foil used for this purpose is often stacked with other components and the size of the burrs needs to be controlled to be much lower than usual.

The size and density of the bur will directly affect the reliability of the product and the service life of the equipment. That is, if the size of the bur is large, it may damage adjacent contact parts, cause electrical shorts, or cause permanent damage to the equipment in contact with the burrs. Therefore, it is required that the size of the burr is controlled to be several mu m level or less, although it differs depending on the use.

Generally, a mechanical method is used for separating a metal plate or foil into a desired shape. Such mechanical methods are primarily shearing, and include cutting, blanking, punching, trimming, notching, shaving, slitting, or the like. There is a processing method using these.

However, unlike a general sheet material or coil having a thickness of several millimeters to several centimeters, the metal foil is a very thin material having a thickness of about 100 mu m. When such a thin metal foil is cut by shearing, The thickness or size of the cutting edge or cutting block is relatively large compared to the thickness and the force exerted on the metal foil for shearing is large.

In this way, the metal foil has a very thin thickness, so that when the metal foil is cut, the whole cut surface is cut by the plastic working. As a result, a shear droop increases at the upper end of the foil, Also, a large amount of burr is generated at the lower end where the cutting edge comes out.

The generation of burrs or pressed surfaces (hereinafter, simply referred to as "burrs") by such a plastic working process occurs also in the cutting of a plate material, a coil, or the like, The size of the burr produced is relatively small compared with the thickness, and the occurrence of such burr is not a problem even in the application of the material.

However, the metal foil is a very thin material having a very thin thickness of the material itself. Therefore, it is easy to cut the metal foil, but it is very difficult to cut without producing burrs, and the size of the burr is relatively larger than the thickness, and it is also very difficult to control the burr produced.

It can be said that the weight of the burrs generated at the time of cutting the metal foil is relatively large relative to the thickness thereof. In addition, the field to which such extreme laminated materials are applied is a very sensitive field, and the occurrence of burrs can have a serious effect on parts and products as described above. Therefore, it is required to cut the metal foil that can minimize the cut metal foil and burrs with the burrs minimized.

Methods other than the above-mentioned shearing include water jet machining, laser machining, plasma cutting, wire cutting, etching, and the like. However, these methods also have the following problems.

In the water jet machining, the abrasive grains can remain on the surface of the workpiece, and cutting marks in the order of micrometers can remain on the cut surface, so that precise shape machining is not easy, and the machining method is very expensive. In addition, in the case of the above-described laser machining, equipment cost and maintenance cost are high, the burr can be formed while the material is melted and solidified, and thickness uniformity can be prevented.

In addition, plasma cutting is also required to maintain accurate machining values in the order of micrometers or less, and burrs may be generated in the melting and solidification process of the cut portions. Further, the wire cutting is expensive, the cutting speed is slow, and the productivity is not sufficient.

On the other hand, the etching is a cutting using a photolithography process and can be cut to an exact size, and burr is not generated. However, expensive photoresist must be used, etching takes a long time, do. In addition, it is also difficult to recycle the remaining material after cutting.

A number of techniques for providing burr-free processed materials by removing burrs produced by cutting, for example, by grinding or the like, are known rather than suppressing the formation of burrs at the time of cutting the steel material, It is very difficult to selectively remove the burrs by such methods when the present invention is applied to a metal foil having an extremely thin thickness as in the present invention.

It may also cause damage to the metal foil during the deburring process, which can lead to product quality deterioration, which can be treated as a fatal defect, depending on the application. In addition, when a plastic protective film or the like is previously formed on at least one surface of the foil, it is not suitable to be applied.

Unlike ordinary sheets or coils with a thickness of several millimeters to several centimeters, shearing of a metal foil having a height of 300 μm or less has a relatively large thickness or size of cutting blades or cutting blocks compared to the thickness of the material, The force also increases. As a result, the entire cut surface is plasticized due to the very thin thickness, so that a large amount of burrs are formed at the end of the cut surface or the size of the shear droop is greatly increased as compared with a workpiece having a diameter of several millimeters or more. That is to say, unlike conventional workpieces of several millimeters or more, due to the characteristics of very thin workpieces when separating metal foils, the entire cut surface is subjected to plastic working so that the entire cut surface is formed only on the front surface, .

SUMMARY OF THE INVENTION The present invention is directed to a metal foil having a burr-free metal foil and a method of cutting the metal foil.

The present invention aims at suppressing the problem that burrs are generated by preventing the plastic front end surface from being formed to the output side in performing the mechanical shearing process of the metal foil.

According to an embodiment of the present invention, there is provided a metal foil having a thickness (t) ranging from 2 to 300 mu m, wherein the metal foil has a cut surface Wherein the cut surface is located at the top of the cut surface in the thickness direction and has an upper end surface having a cutting edge; A lower end surface located at a lower end of the cut surface and having a cutting edge; And a fracture surface existing between the upper end surface and the lower end surface.

The height (s1) of the upper end surface is preferably 0.05 t or more and 0.80 t or less, and the height (f) of the fracture surface is preferably 0.05 t or more and 0.80 t or less. For example, The height (f) is preferably 1 mu m or more. Further, it is preferable that the height s2 of the lower end face is 0.80t or less. For example, the height s2 of the lower end face is preferably less than 20 mu m.

Wherein a perpendicularity tolerance value, which is a distance from an upper surface of the metal foil into which the cutting edge of the lower end surface section is inserted and a cut surface farthest from the lower surface of the lower surface corner of the metal foil, t / 50.

In addition, it is preferable that the upper end surface has a shear droop, and the size d of the pressed surface is less than 2 탆. The upper end face and the lower end face have a plurality of contact marks which are straight in the cutting direction due to friction with the cutting edge. In addition, the fracture plane includes a plurality of dimples symmetrical with respect to the center axis in the cutting direction, and the dimples are formed by plastic deformation caused by stress applied to the metal foil by the cutting edge, or by plastic deformation and brittle fracture will be.

The metal foil may be formed such that the size b of the burr is less than 0.2 t, for example, the size b of the burr may be less than 8 탆.

It is preferable that the metal foil has a tensile strength of 600 MPa or more and an elongation of 10% or less.

The metal foil may be selected from the group consisting of Fe, Ag, Au, Cu, Cr, W, Al, W, Mo, Zn, Ni, Pt, Pd, And may be a metal foil of Mn, Si, Ta, Ti, Sn, Zn, Pb, V, Ru, Ir, Zr, Rh, Mg or alloys of two or more of these metals. More preferably, A metal foil made of a metal selected from the group consisting of Ni alloy, Fe-Cu alloy, Fe-Co alloy, Fe-Cr alloy, Invar and stainless steel.

Further, the metal foil may include at least one plastic film layer on at least one surface thereof. The plastic film may be formed of at least one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyamide PA), polycarbonate (PC), Optical Clear Adhesive (OCA), epoxy, and mixtures of two or more thereof.

Such a metal foil can be used as a substrate, a backing plate, a protective film, or an encapsulant in a field of illumination, display, solar cell, secondary battery, fuel cell, photoelectrochemical cell, sensor, and semiconductor.

Further, the present invention provides a method of manufacturing a metal foil, comprising: shearing at least a portion of a metal foil thickness by pressing one surface of the metal foil with a cutting edge; Stressing the metal foil by the cutting edge to fracture a portion of the remaining portion of the remaining metal foil thickness; And a step of pressing and deforming the remainder of the metal foil by means of the cutting edge so as to cut the metal foil.

The cut metal foil provided by the present invention can obtain a metal foil having a minimized burr of several micrometers or less by maintaining the fractured surface subjected to plastic deformation at the cut surface.

According to the present invention, it is possible to cut the metal foil through shearing in a state in which generation of burrs is minimized at a level similar to cutting by the etching method, so that the processing time and cost can be minimized compared with other methods, The metal foil can be obtained with high productivity because no additional process is required to remove burrs generated by the metal foil.

It is possible to avoid the use of the acid solution required in the conventional etching method in order to minimize the generation of burrs, thereby making it environment-friendly. Further, it is difficult to recycle the removed portion by etching. It is possible to greatly increase the rate at which reclaimed scrap can be recycled.

In addition, since generation of burrs is minimized, it is possible to eliminate the adverse effect on the parts and products when the metal foil is used as an electronic or energy-related part, and thus the life and reliability of the product and the manufacturing equipment can be greatly increased.

Further, even when a different kind of material such as a protective plastic is cut at the same time, since the dissimilar material is not subjected to the application of acid or heat, it is possible to cut at the same time, and productivity can be increased.

Fig. 1 is a schematic cross-sectional view showing a case in which burrs are generated in the case of having a cut surface cut only by shearing.
Fig. 2 is a photograph showing an example showing that burrs are generated, as shown in Fig. 1, having a cut surface cut only by shearing.
Fig. 3 is a schematic cross-sectional view showing that burrs can be generated when the shear section includes a shear section and a fracture section due to plastic deformation but does not include a lower shear section.
FIG. 4 is a schematic view of a cut surface in which a burr is not formed according to an embodiment of the present invention. The cut surface includes a top and bottom cut surface and a fractured surface between the front surface.
5 is a photograph showing an example of a cut surface on which a burr is not formed according to an embodiment of the present invention, and includes a top end and a bottom end front end face on a cut face and a fracture end face between the front end face.
6 is a view for explaining the variables in the foil cutting by the slitting of the first embodiment.

An object of the present invention is to provide a metal foil in which the generation of burrs on the cut surface is minimized when the metal foil is cut by shearing.

The metal foil can be obtained by rolling or electroforming, and the production conditions are not particularly limited. In the present invention, the metal foil is not particularly limited as long as it has a thickness of 300 mu m or less. Though not limited thereto, the thickness t of the metal foil can be suitably used for products requiring flexibility, light weight, and thin thickness. In addition, since the size of the burr formed by cutting is relatively small as compared with the thickness of the metal foil having a diameter of more than 300 mu m and the burr caused during cutting is not so large in the application, Lt; / RTI > However, the principle of the present invention can be suitably applied to metal foils having a diameter of more than 300 mu m.

For example, when a metal foil capable of realizing a radius of curvature of 10 cm or less, which is applicable to a product requiring high flexibility, is desired, it is preferable to have a thickness of 100 탆 or less. On the other hand, the present invention can more suitably be applied to a metal foil having a thickness of less than 100 mu m.

The minimum thickness of the metal foil may vary depending on the kind of the metal. However, when a carrier film is used based on a metal foil having a tensile strength of 1 GPa or more, which is the most rigid, a thickness of 2 탆 or more Preferably, the metal foil has a thickness of 2 탆 or more.

At this time, the cut surface includes a top end front face where the cutting edge enters the shearing direction with respect to the thickness direction of the foil, and a lower end shear face that completes the cutting of the foil by shearing while breaking the cutting edge. That is, both the upper and lower end faces are cut regions cut by shearing. The upper and lower end face sections are sheared by friction with the cutting edge, and have a plurality of contact marks straight in the cutting direction on the front end face.

On the other hand, there is a pressed surface due to the cutting blade in the thickness direction of the metal foil due to the pressure applied when the cutting edge enters. The pressed surface may be an inclined surface between the cut surface and the upper surface of the metal foil, that is, the surface on which the upper end surface is formed. Such a pressed surface is present at about 20% or less of the foil thickness.

However, if cutting of the metal foil is performed only by shearing, burrs are formed on the lower end surface of the metal foil. The present invention is intended to provide a metal foil which does not generate burrs when the metal foil is cut by shearing, and it is preferable that a fracture surface exists between the upper end front end face and the lower end front end face.

Burrs are generated when the material is pushed in the thickness direction by shearing, and the height of the plastically deformed shear surface is minimized to minimize burrs. That is, since the burr is formed in proportion to the height of continuous shearing, it is necessary to lower the height of the continuous shear section. To this end, the present invention forms a fracture surface between the upper end face and the lower end face to reduce the area of the final shearing to the lower end face, thereby minimizing burrs.

The fracture surface is a portion where the metal foil is subjected to plastic fracture, plastic fracture and brittle fracture due to stress applied by the cutting edge. Therefore, the fracture surface includes dimple-shaped protrusions and depressions as signs of plastic fracture or brittle fracture. The dimples are symmetrical with respect to the cutting direction axis but not symmetrical with respect to the vertical direction axis in the cutting direction.

As described above, by having a top end and a bottom end shear section by shear deformation and a fracture section by plastic deformation or brittle fracture, burrs can be eliminated or minimized in the lower end shear section.

Generally, at the time of cutting by shearing using a cutting blade which makes a burr, the cutting blade rubs against the cut surface of the foil, so that a part of the cut surface generates a burr as the cutting edge rises. This is schematically shown in Fig. 1, and a photograph showing an example in which a bur is formed as a cut surface of a metal foil cut by shearing is shown in Fig.

1 and 2, when the front end face 400 occupies 95% or more of the cut face 100, the front end face 400 is pushed out to the thickness of the metal foil or more and the burr 600 is generated. Specifically, as shown in FIG. 3, it is seen that the front end face 400 that is plastically deformed at the output side 300 is present in a thickness of more than the metal, and the shape of the output side 300 is uneven and a large bur 600 is generated.

However, when a fracture surface is generated between the upper end front end portion and the lower end front end portion of the cut surface as in the present invention, the portion pushed by the friction at the upper end front end is not broken along with the breaking, The cutting edge is cut by the cutting edge, so that the milling due to the cutting edge can be minimized. Therefore, the burring caused by the friction with the cutting edge is minimized or eliminated at the lower end front end, so that generation of burrs can be eliminated or minimized.

For example, in a metal foil having a thickness of a metal foil of 300 탆 or less, more preferably of 100 탆 or less, a top end front section generated by shear deformation in a cut surface is stopped by generation of a fracture surface. And then the burr can be minimized by minimizing the lower shear section. That is, burrs are not caused by plastic deformation of the entire thickness t of the cut surface, but are generated only by the lower end surface with the shear deformation region minimized by the fracture surface, thereby minimizing burr formation.

In order to eliminate or minimize the formation of burrs on the cut surface, the average height of the upper end surface is preferably 0.05 t or more and 0.80 t or less when the thickness of the metal foil is t. If a shear profile less than 0.05 t is produced, it may be cut into irregular fracture profiles and undesired shapes instead of the desired shape. This can be caused by breakage from the beginning of cutting in a material such as ceramics which is mainly brittle. On the other hand, when the size of the shear section exceeds 0.80 t of the thickness of the metal foil, the burr due to the shear progresses locally beyond the thickness of the metal foil, thereby increasing burrs. It is more preferable that the upper end surface is 0.5t or less.

On the other hand, it is possible to eliminate or minimize the generation of burrs in the lower end shear section for the reasons described above just by forming the broken section. However, for example, More preferable. When the length of the fracture surface is less than 0.05t, the upper end surface and the lower end surface can not be completely disconnected, so that the shear deformation can be continued. In this case, the burr can not be minimized. Also, the length of the lower end face may be increased. In this case, burrs may occur, and it is preferable that the upper end face has a greater fracture surface in order to suppress the generation of burrs as much as possible. For example, the fracture surface is preferably larger than 1 mu m. More preferably 5 mu m or more.

On the other hand, it is preferable that the fracture surface is 0.80 t or less. If it is larger than this, generation of burrs can be prevented, but a substantial part of the cut surface of the metal foil may be nonuniformly formed by plastic fracture or brittle fracture, The portion remaining on the nonuniform cut surface is folded, which may have adverse effects similar to burrs in some cases.

The present invention minimizes the generation of burrs on the output side by decreasing the height of the continuous shear deformation, so that it is desirable to minimize the height of the lower end shear section that generates burrs.

It is preferable that the lower end face has a thickness of 0.80 t or less with respect to the thickness t of the foil. When the size of the lower end surface of the lower end surface exceeds 0.80 t, the length of the lower end surface of the lower end surface is likely to be large as described above. In order to suppress the generation of burrs as much as possible, desirable. On the other hand, it is more preferable that the lower end surface section is 0.05 t or more. In the case of not having the lower end shearing section, the breaking section may become larger, and in this case, the breaking section is uneven, which is not preferable. For example, in order not to damage the electronic device or the equipment, it is preferable that the lower end surface section is less than 20 占 퐉. More preferably not more than 10 mu m.

In the present invention, it is most preferable that the perpendicularity tolerance value measured from each of the one side of the metal foil where the top end front end faces and the other side of the metal foil where the bottom end front end contact is 0, Due to the presence of the crushed surface and the presence of the fracture surface, it has a squareness tolerance value. However, when the squareness tolerance value is large, the shape of the cut surface is not smooth, which may cause side effects when applied to a product.

An example of a metal foil having a cut surface provided by the present invention is shown in Figs. 4 and 5. Fig. 4 is a view schematically showing a cut surface of a cut metal foil by shearing. 4 shows that the metal foil has a front end face 400 and a front end face 400 formed by a shearing process on the input side 200 where the cutting edge is inserted and the output side 300 where the cutting edge is out, And has a frustoconical surface 500 between the cross-sections 410. As can be seen from this, it can be seen that burrs are not generated on the lower end face side, that is, on the exit side where the cutting edge goes out.

FIG. 5 is a SEM photograph of a cut surface 100 of a sheared metal foil including a cutting surface according to the present invention. The upper smooth surface is a top end surface 400, The cutting face 100 is formed by plastic deformation of the cutting face 100 of the metal foil by the cutting edge and the cutting face 100 is formed in a straight line in the cutting direction due to the friction between the cutting edge and the metal foil due to the fine surface roughness existing in the cutting edge. Is observed. The size of the upper end face section 400 ranges from a minimum of about 10% to about 45% over the section thickness t.

From the upper front end face 400, there is a fracture face 500 including dimple-shaped concave-convex portions having a size of 1 to 2 탆 or less as a region where plastic destruction occurred. The fracture surface 500 is formed from about 30% to about 75% of the thickness t of the cut surface 100.

A lower end shear section 410 of a smooth surface similar to the upper end front section 400 is formed from the lower end section 500 to the upper section 300 at a height of about 3% .

3 is a schematic diagram showing that the burr 600 can be generated when the burr 600 includes the front end face 400 and the fracture end face 500 but does not include the lower end front end face. In other words, if the upper end face 400 includes the broken end face 500 but the lower end face is not formed, if the size of the broken end face 600 is small, as shown in FIG. 3, The burr 600 can be generated by the cutting surface pushed by the friction with the cutting edge.

Therefore, it is preferable that the squareness tolerance value is cut so as to be minimized. Since the metal foil is used as an ultra precise part, a variation in size, shape, etc. of the upper surface of the metal foil having the cutting edge after cutting and the lower surface of the metal foil having the cutting edge must be minimized.

For example, a distance from the upper surface of the metal foil including the cutting edge of the lower end surface section to the cutting surface that is farthest from the lower surface of the lower surface corner of the metal foil is defined as a rectangular angle tolerance value , The perpendicularity degree tolerance value is preferably t / 10 to t / 50, where t is the thickness of the metal foil.

According to the present invention, when the cut surface of the metal foil is t, the thickness of the metal foil is t, a metal foil having a cut surface with a burr of 0.2 t or less can be obtained. For example, in the case of a metal foil having a thickness of 50 mu m, although depending on the thickness of the metal foil, a metal foil having a cut surface with 8 mu m burrs can be obtained.

According to the present invention, it is possible to secure the safety even if it is applied to various fields such as illumination, display, solar cell, secondary battery, fuel cell, photoelectric chemical cell, sensor, .

The metal foil is not particularly limited and includes, for example, Fe, Ag, Au, Cu, Cr, W, Al, W, Mo, Zn, Ni, Pt, Pd, Co, In. Mn, Si, Ta, Ti, Sn, Zn, Pb, V, Ru, Ir, Zr, Rh or Mg. At this time, the foil may be a single metal of these metals or a foil of two or more alloys. Specific examples of the metal foil may include pure iron, low carbon steel, Fe-Ni alloy, Fe-Cu alloy, Fe-Co alloy, Fe-Cr alloy, Invar or stainless steel.

On the other hand, in the present invention, the metal foil is not necessarily limited to this, but it may be more suitably applied to a metal foil having a tensile strength of 600 MPa or more or an elongation of 10% or less. In the case of a foil having a tensile strength of the foil of less than 600 MPa or an elongation of more than 10%, breakage does not occur due to the characteristics of the material, and the foil is completely cut by shearing.

The present invention can also be applied to a case where a coating layer is included on one side or both sides of a metal foil. The coating layer may be, for example, a resin film, and the resin film may be a multilayer.

The resin film may be, for example, PET, PEN, PI, PA, PC, OCA, epoxy, or the like. These resin films may be a single kind of film or may be a single layer or a composite layer in which different kinds of resins are mixed.

In obtaining the metal foil having the cut surface formed by the shearing of the present invention, the cutting means by shearing is applicable, and there is no particular limitation. For example, slitting, trimming, cutting, blanking, punching and the like can be applied, and the cutting blade can be a roll-to-roll It may be the end of the wheel used in the roll-to-roll process, the end of the square used for cutting, or the end of the die used for blanking.

Example

Hereinafter, the present invention will be described more specifically by way of examples. However, the following embodiments are only examples of the present invention, and thus the present invention is not limited thereto.

Example  One

The rolled foil was sheared to a width of 100 mm by slitting by a roll-to-roll continuous process and cut. At this time, the slitting conditions at the time of cutting were as shown in Table 1.

No. One 2 3 4 5 6 7 8 9 10 depth 0.3 0.3 0.3 0.2 0.2 0.2 0.2 0.2 0.2 0.1 Side pressure 0.03 0.06 0.09 0.09 0.09 0.06 0.06 0.03 0.03 0.1 Angle of the day 30 30 30 30 45 30 45 30 45 30 Burst occurrence ○ ○ ○ × × ○ × ○ × ○

The slitting parameters are shown in Fig. That is, the depth refers to the depth at which the cemented carbide wheel is inserted past the pedestal, the side pressure is the lateral distance between the cemented carbide wheel and the pedestal, and the blade angle means the tip angle of the carbide wheel.

When the depth, blade angle, and side pressure were changed as shown in Table 1, no. 4, 5, 7, and 9, no burrs were observed. As a result of checking the cut surfaces, it was confirmed that both the shear surface and the fractured surface having the shapes shown in Figs. 4 and 5 were mixed.

On the other hand, no. 1, 2, 3, 6, 8, and 10 were formed as shown in FIG. 3, in which the upper end surface was excessively large and only a part of the fracture surface was formed, or only one shear surface was formed as shown in FIG.

Example  2

The STS foil having a thickness of 50 탆 and a width of 500 mm wound with a roll was cut using a calotting machine under the same conditions as shown in Table 2.

The cut surfaces of the cut foil were observed, and the results are shown in Table 2.

No One 2 3 4 5 6 7 8 9 10 Side pressure 0.03 0.06 0.09 0.09 0.06 0.02 0.06 0.03 0.02 0.1 Angle of the day 45 45 45 45 45 45 45 45 45 45 Burst occurrence O O O O X O X O O O

As shown in Table 2, 5 and 7, no burr occurred. As a result of checking the cut surfaces, it was confirmed that the fracture surfaces existed between the upper end surface and the lower end surface, as shown in Figs. 4 and 5.

100: Cutting plane 200: Border side 300: Out side
400: first front end face 410: second front end face 500: broken end face
600: Burr

Claims (20)

A metal foil having a thickness (t) ranging from 2 to 300 mu m,
Wherein the metal foil has a cut surface cut by shearing,
Wherein the cut surface is located at the top of the cut surface in the thickness direction and has an upper end surface having a cutting edge; A lower end surface located at a lower end of the cut surface and having a cutting edge; And a fracture surface existing between the upper end surface and the lower end surface.
The metal foil according to claim 1, wherein a height (s1) of the upper end surface is 0.05 t or more and 0.80 t or less on average.
The metal foil according to claim 1, wherein the height (f) of the fracture surface is 0.05 t or more and 0.80 t or less.
The metal foil according to claim 1, wherein the height (f) of the fracture surface is 1 占 퐉 or more.
The metal foil according to claim 1, wherein the height (s2) of the lower end face is 0.80 t or less.
The metal foil according to claim 1, wherein the height (s2) of the lower end face is less than 20 占 퐉.
The method of manufacturing a metal foil according to any one of claims 1 to 3, wherein a perpendicularity degree which is a distance from an upper surface of the metal foil into which the cutting edge of the lower end surface section is inserted to a cut surface farthest from the lower surface of the lower surface corner, A metal foil having a value of t / 10 to t / 50.
The metal foil of claim 1, wherein the upper end face has a pressed surface, and the size (d) of the pressed surface is less than 2 占 퐉.
The metal foil according to claim 1, wherein the upper end surface and the lower end surface have a plurality of contact marks which are straight in the cutting direction due to friction with the cutting edge.
The metal foil of claim 1, wherein the fracture surface comprises a plurality of dimples, the dimples being symmetrical about a center axis in the cutting direction.
11. The metal foil according to claim 10, wherein the dimples are formed by plastic fracture or plastic fracture and brittle fracture caused by stress applied to the metal foil by a cutting edge.
The metal foil according to any one of claims 1 to 11, wherein the metal foil has a size (b) of a burr of 0.2 t or less.
The metal foil according to any one of claims 1 to 11, wherein the metal foil has a size (b) of a burr of 8 탆 or less.
The metal foil according to claim 1, wherein the tensile strength of the metal foil is 600 MPa or more.
The metal foil according to claim 1, wherein the metal foil has an elongation of 10% or less.
The metal foil of claim 1, wherein the metal foil comprises at least one plastic film layer on at least one side.
17. The method of claim 16, wherein the plastic film is selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyamide (PA), polycarbonate A metal foil that is one or more plastic selected.
The method of claim 1, wherein the metal foil is Fe, Ag, Au, Cu, Cr, W, Al, W, Mo, Zn, Ni, Pt, Pd, A metal foil made of at least two alloys of Mn, Si, Ta, Ti, Sn, Zn, Pb, V, Ru, Ir, Zr, Rh,
The metal foil according to claim 1, wherein the metal foil is a metal foil made of a metal selected from the group consisting of pure iron, low carbon steel, Fe-Ni alloy, Fe-Cu alloy, Fe-Co alloy, Fe-Cr alloy, Invar and stainless steel .
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