KR20160037448A - Method and system for producing cutting product - Google Patents

Abstract

Provided are a method and a system for producing a cut product. The method for producing a cut product comprises: a first cutting step of cutting a material into multiple first products; a defective product extracting step of extracting defective products among the first products obtained in the first cutting step; and a second cutting step of obtaining second products, which are smaller than the first products, by cutting the defective products extracted in the defective product extracting step to avoid defects. Therefore, the present invention maximizes an area yield (commercialization efficiency).

Description

METHOD AND SYSTEM FOR PRODUCING CUTTING PRODUCT

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production method and system for a cut product, and more particularly, to a production method and system for a cut product that can maximize area yield through downsizing.

In general, a product on a film (or sheet) is produced in the form of a fabric having a size larger than the size of the product to be actually used. For example, optical members such as a polarizing plate and a retardation plate used for a display device and the like are the same. For example, considering the various factors such as the efficiency of the manufacturing process and the fluctuation of the demand for the product, the polarizer supplier (manufacturer) has to fabricate a polarizer having a length and width larger in size than the product .

Further, the fabric is, in most cases, produced in a strip shape through a continuous process, and the fabric is wound on a roll and stored. Thereafter, the fabric wound on the roll is taken out and cut into a unit product of a predetermined size.

In general, in cutting a fabric, a method of cutting a plurality of unit products simultaneously in a single cutting process is widely used. For example, a cutter frame equipped with a plurality of cutters is used. At this time, the yield of the unit product that is cut depends on how the cutting is carried out. Lower cutting efficiency increases scrap, or waste, that is discarded after cutting, which ultimately leads to increased product manufacturing costs.

Also, depending on the type of fabric, there may be undesirable defects in the product. In this case, defects are considered for quality (quality improvement) at the time of cutting the fabric. Generally, defects are formed in the manufacturing process of the fabric or the winding process.

For example, a polarizing plate used in a display device such as a TV is manufactured by (1) a step of obtaining a polarizer, (2) a step of laminating a polarizer protective layer, and (3) a step of laminating a protective film or a release film do. In the step of obtaining a polarizer, a polyvinyl alcohol (PVA) film is mainly dyed and stretched to obtain a polarizer. In the step of laminating the polarizer protective layer, a triacetylcellulose (TAC) film is attached to both surfaces of the polarizer through an adhesive to laminate the polarizer protective layer. At this time, the polarizing plate can be wound on the roll in the course of each step, and at least the product that has undergone the step (3) is wound and held on a roll. When the film is wound on a roll in this manner, it is advantageous not only in terms of transportability to each step, but also ease of storage and handling in the cutting process.

Defects of the fabric mainly occur in the stretching or winding step. For example, in the stretching process, both end portions of the fabric are fixed to the stretching device, and defects may occur in the fixing portions. In the case of the winding process, defects may occur at the end portion fixed to the roll. Further, in the case of the winding process, when there is a scratch on the roll, a periodic defect may occur in a region in contact with the roll due to the characteristics of the rotating roll. If defects are identified in the cut unit product, the loss of the product becomes large.

Accordingly, when cutting a fabric having a defect, the defect inspection is performed prior to the cutting, and cuts are made to avoid defects so that defects are not included in the cut unit product. Also, the yield of the unit product cut as described above is taken into consideration.

In general, the cutting of the fabric may include an inspection process for inspecting the position (distribution) of the defect, a yield calculation process for calculating the yield of the unit product when the cutting is performed virtually on the basis of the defect information, It is proceeding through a cutting process that cuts to a yield rate (maximum yield) higher than a predetermined value based on the calculated value.

For example, Korean Patent Publication No. 10-2008-0033863, Korean Patent No. 10-1179071, and Korean Patent No. 10-1315102 disclose techniques related to the above.

In cutting the fabric as described above, it is cut by avoiding defects, but cutting is performed considering the highest yield. In this case, the yield is the area yield, which is calculated by dividing the total area of the unit product obtained after the cutting by the total area of the entire fabric before cutting, and is usually expressed as a percentage (%).

However, the cutting method according to the prior art is hard to be considered as a method considering the maximum cutting efficiency, for example, for the following reason.

Generally, some of the cuts have drawbacks, although the above considerations are taken into account after the cut of the fabric. Accordingly, defect inspection is performed on the cut product, and when the product is defective (defect-free product) according to the defect inspection result, the product is judged to be shipped. However, the cutting method according to the prior art is disposing of defective products having defects without considering utilization. Accordingly, it is difficult to consider the maximum area yield of the cut products that can be produced from the fabric.

Korean Patent Publication No. 10-2008-0033863 Korean Patent No. 10-1179071 Korean Patent No. 10-1315102

Accordingly, it is an object of the present invention to provide a method and system for producing improved cut products.

An object of the present invention is to provide a production method and a production system of a cut product which can maximize the area yield, for example.

According to a first aspect of the present invention,

A first cutting step of cutting the fabric into a plurality of first products;

A defective product extracting step of extracting a defective product having defects from the plurality of first products obtained in the first cutting step; And

And a second cutting step of cutting the defective product extracted in the defective product extraction step so as to avoid defects to obtain a second product smaller than the size of the first product.

At this time, the defective product extracting step may include a defect inspection step of inspecting defects for each of the plurality of first products; And a product determination step of determining whether the product is a good product or a short product based on the inspection result of the defect inspection step.

According to an exemplary embodiment, the second cutting step can be cut into one or a plurality of second products having a maximum size and / or a maximum area yield taking into account the defect distribution of the extracted defective products.

According to a second aspect of the present invention,

A first cutting unit for cutting the fabric into a plurality of first products;

A defective product extracting unit for extracting a defective product having defects from a plurality of first products obtained by the first cutting unit; And

And a second cutting unit for cutting the defective product extracted by the defective product extracting unit so as to avoid defects to obtain a second product smaller than the size of the first product.

At this time, the defect product extracting unit may include a defect inspection unit for inspecting defects for each of the plurality of first products; And a product judging section that judges whether the product is a good product or a short product based on the inspection result of the defect inspecting section.

The second cutting unit may include a product selecting unit that selects a second product having a maximum size and / or a maximum area yield in consideration of a defect distribution of the defective product extracted by the defective product extracting unit; And a cutting device for cutting the product into a second product having a maximum size and / or a maximum area yield according to a result of the product selecting part.

According to the present invention, there is provided a method and system for producing an improved cut product. According to the present invention, for example, a defective product is produced through down-sizing and has a maximum area yield.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view (in the form of a fabric cut) of a fabric for explaining a production method of a cut product according to an embodiment of the present invention. Fig.
2 is a cutting process diagram for explaining a production method of a cut product according to an embodiment of the present invention.
3 is a cutting process diagram for explaining a production method of a cut product according to another embodiment of the present invention.
4 is a configuration diagram showing a production system of a cut product according to an embodiment of the present invention.
5 is a perspective view showing an embodiment of a cutting apparatus constituting a production system for a cut product according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The accompanying drawings are provided to aid in understanding the present invention. In the accompanying drawings, the thickness may be enlarged to clearly show each region, and the scope of the present invention is not limited by the thickness, size, and ratio shown in the drawings.

In the present invention, 'and / or' are used to mean at least one of the components listed before and after.

In the present invention, terms such as "first", "second", and "third" are used to distinguish one element from another, no.

In the present invention, "forming on a phase" or the like does not mean only that the constituent elements are laminated directly on each other, but includes the meaning that other constituent elements are formed between the constituent elements. For example, "formed on the surface" means not only that the second component is formed directly on the surface of the first component, but also the third component is formed between the first component and the second component It also includes the meaning that more elements can be formed.

(1) Fabric

In the present invention, the raw material to be cut is a base material on a film (or sheet), which is included in the base material as long as it has a relatively larger size than before the cutting. In the present invention, the fabric to be cut includes a fabric produced at a manufacturing factory of the fabric, and a strip fabric obtained by slitting the fabric in the lengthwise direction.

Further, in the present invention, the kind of the fabric and the laminated structure are not particularly limited. The fabric may be selected from an optical member or a protective member on a film (or sheet) to be applied to, for example, electric or electronic products. The fabric may be selected from optical members applied to a more specific example, a display device such as a TV or a monitor. In addition, the fabric includes a single layer body and / or a laminate body.

In one example, the fabric may be selected from a polarizer. At this time, the polarizing plate may have a laminated structure including a polarizer and a polarizer protective layer formed on the polarizer. The polarizer may be selected from, for example, a polyvinyl alcohol (PVA) film or the like which is dyed and stretched. The polarizer protective layer may be selected from, for example, triacetylcellulose (TAC) film and attached to both sides of the polarizer through an adhesive. In addition, the polarizing plate may have a laminated structure further comprising a protective film and / or a release film formed on the polarizer protective layer.

The fabric can be taken out, for example, in the form of a strip wound on a roll. The width and length of the fabric are not limited. The fabric may have a width of, for example, 40 mm to 2,500 mm and a length of 1,000 cm to 3,000 m, but is not limited thereto.

On the other hand, the defect formed on the fabric is an undesirable defect point for the product, which may be formed in the manufacturing process of the fabric and / or the winding process. Defects include, for example, foreign matter, contamination, twisting, scratches, and / or bubbles.

In the accompanying drawings, "*" represents defect (d). There may be one or more of the above-mentioned defects in the fabric, but two or more kinds of defects may exist in the fabric.

(2) Foundation

In the present invention, the cutting is not particularly limited. The cutting may be performed as long as the product can be obtained by cutting the fabric in the longitudinal direction and the width direction. The cutting may be performed, for example, through a metal knife, a jet water knife and / or a light source, and the light source may be a laser beam or the like.

(3) Products, good and shorts

In the present invention, a product means a cut product produced by cutting. And good product means good quality product with no defects (d) in the cut products, and defective product means defective product with defect (d) among the cut products.

(4) Area yield

In the present invention, the area yield is calculated by dividing the area of the cut product obtained after cutting by the area before cutting. In the following embodiments, the terms used and the yield of the good product refer to the area yield of the good product considering the defect (d).

(5) Size

In the present invention, the size means at least one selected from the width, length, area, and diagonal length of the fabric or cut product.

In the present invention, the size is used in the above meaning unless otherwise specified in the following embodiments. Also, inches representing the length may mean diagonal length, as is well known. The inch may refer to a diagonal length, for example, when the product is a rectangular product such as a polarizing plate for a TV.

A method of producing a cut product according to the present invention includes a first cutting step of cutting a raw material 10 into a plurality of first products 11, a first cutting step of cutting a plurality of first products 11 obtained in the first cutting step, and a second cutting step of cutting the defective product 11d extracted in the defective product extracting step into a second product 12, as shown in FIG. At this time, the second product 12 is smaller than the first product 11 and is a good product. An exemplary embodiment of each step will be described as follows.

Step 1 of Foundation

One fabric 10 is shown in Fig. The fabric 10 has a strip shape, for example, wound on a roll. The fabric 10 shown in Fig. 1 is an unfolded, which shows a part of the fabric 10.

For the raw fabric 10, a specific first product 11 having the greatest area yield is cut. The area yield can be calculated, for example, by dividing the total area of the first product 11 to be cut, which is virtually cut, by the area of the cutting front end 10. For example, area yields of products A, B, and C differing in size from each other with respect to the fabric 10 are calculated at the time of virtual cutting, and the area yield of the products is calculated. do. At this time, the area yield is also taken into consideration for defect (d). That is, it is cut into a specific product having the largest area yield considering the defect (d).

The cutting method is as described above. The cutting can be, for example, a metal knife, a jet water knife and / or a light source (such as a laser beam). The cutting can use a cutting frame F equipped with a plurality of cutters, according to one embodiment. At this time, a metal knife is attached to the cutting frame F as a cutter, and cutting can be performed by a punching method. As shown in Fig. 1, it is possible to cut a plurality of first products 11 using a cutting frame F so as to have a predetermined inclination angle with respect to the longitudinal direction of the raw material 10. At this time, the longitudinal direction of the first product 11 to be cut and the longitudinal direction of the cloth 10 may have an acute angle of, for example, 45 degrees.

Through the above-described cutting, a plurality of first products 11 are obtained. At this time, a plurality of first products 11 produced after the cutting is mostly good, and a part thereof may be a shortage 11d. The defective product 11d is a defective product having the defect d as mentioned above. One or a plurality of defects d may exist in such a product 11d. In Fig. 2, a single piece 11d is illustrated.

Defective product extraction step

(11d) is extracted from the plurality of first products (11) obtained in the first cutting step. The defective product extracting step includes a defective inspection step for inspecting defects (d) for each of the plurality of first products (11), and a defective product detection step ) To determine whether the product is a product or not. At this time, a product having at least one defect (d) as a result of the defect inspection is determined as a product 11d and extracted. And good goods without defects (d) are shipped.

The defect (d) can be inspected by the inspector or defect inspection apparatus. In one example, the defect (d) is inspected by an automatic defect inspection apparatus through an image in an automatic scanning manner, and the defect information thus inspected can be displayed on the screen through a display unit of the defect inspection apparatus. The determination information includes the position (distribution), type, size, and / or number of the defect (d), and may be expressed as x-y coordinates in the case of the position (distribution) of the defect (d). The inspection method and display method of the defect (d) are not particularly limited, and they can be carried out by a conventional method, for example.

Fig. 2 shows a cutting process according to an exemplary embodiment of the present invention. In Fig. 2, a piece 11d having two defects (d) is illustrated. 2, (a) shows a state in which two defects (d) are represented by coordinates (x1, y1) and coordinates (x2, y2). The piece 11d having a defect (d) distribution as shown in Fig. 2 can be cut into a good piece. Specifically, the product 11d shown in FIG. 2 can be produced as a second product 12 that is smaller than the size of the first product 11 through down-sizing. Therefore, the product judging step judges whether the cut first product 11 is a good product or a short product 11d, and judges a shortage (d) distribution (position) with respect to the judged product 11d, Can be produced in the second product (12).

2nd Foundation Phase

The defective product 11d extracted in the combined product extraction step is cut into the second product 12 while avoiding the defect (d). The second product 12 is a good product having a size smaller than that of the first product 11, which is one or more than two. At this time, one or more second products 12 are cut in consideration of the maximum product size and / or the maximum area yield among the second products 12 that can be cut.

FIG. 2 illustrates a state in which a piece of the product 11d is cut into a single second product 12, and FIG. 3 illustrates a state in which the product is cut into two pieces of the second product 12a and 12b. For example, with respect to the product 11d shown in Fig. 2, the maximum area that can be obtained by avoiding the defect (d) may be the area "S" indicated by the dotted line in Fig. The size and the number of the second products 12 which can maximize the use of the area "S" are selected and cut.

For example, assume that there are products A, B, C, D, and E that can be cut with respect to the fabric 10, and the sizes of these products are A> B> C> D> E. At this time, when the first product 11 is cut into a product A having the largest size, the product 11d is down-sized and cut into a second product 12 smaller than the product A. Specifically, the second product 12 produced by cutting the piece 11d may be at least one selected from products B to E. At this time, referring to FIG. 2, if the second product 12 capable of maximizing the area "S" has one product B, it is cut into one product B while avoiding the defect (d). Fig. 3 shows a cut form according to another embodiment. 3, when the second product 12 capable of maximizing the area "S" is a combination of one product D and one product E, as shown in FIG. 3, it is possible to avoid the defect (d) 1 and one E product and cut into two second products 12a and 12b.

Thus, according to the present invention, the product 11d generated at the time of cutting the fabric 10 is not discarded but is produced as a good product 12 through down-sizing, and the maximum area yield Yield).

Hereinafter, an exemplary embodiment of a production system of a cut product according to the present invention will be described. 4 and 5 show an exemplary configuration of a production system for a cut product according to the present invention.

4, a production system (apparatus) for a cut product according to the present invention includes a first cutting unit 100, a defective product extracting unit 200, and a second cutting unit 300, The first cutting step, the defect product extracting step, and the second cutting step.

The first cutting unit 100 cuts the fabric 10 into a plurality of first products 11. The first cutting unit cuts the specific first product 11 having the greatest area yield, for example, by pulling the cloth 10 out of the roll.

The cutting unit 300 includes at least a cutting device. The above-described cutting device can be configured as usual, for example. The cutting device may include, for example, a supporting means for supporting the fabric 10 and a cutting means for cutting the fabric 10. The support means may comprise at least one selected from, for example, a conveying conveyor, a conveying roll, and a support plate. The cutting means may have a structure including at least one selected from a metal knife, a jet water knife, a light source (laser beam irradiator, etc.), and the like.

The defective product extracting unit 200 extracts a product 11d having a defect d from a plurality of first products 11 obtained from the first cutting unit 100. [ The defect product extracting unit 200 includes a defect inspecting unit 210 for inspecting each of the plurality of first products 11 with a defect d and a defect inspection unit 210, , And a product judging unit 220 for judging whether the product is a good product or a product 11d.

The defect inspection unit 210 may include a defect inspection apparatus for inspecting the defect (d) by an automatic scanning method through an image. The defect inspection apparatus may be selected from a commonly used apparatus. The product judging unit 220 can judge and extract a product having at least one defect d as a product 11d and make a shipping decision for a good product without a defect d. The product determining unit 220 determines whether the first product 11 that has been cut is a good product or a lost product 11d based on the inspection result of the defect inspecting unit 210, It is possible to determine whether or not it can be produced in the second product 12 of a predetermined size considering the defect (d) distribution (position).

The second cutting unit 300 cuts the second product 12 from the defect 11d extracted from the defective product extracting unit 200 while avoiding the defect d. As described above, the second product 12 is a good product smaller than the first product 11. At this time, the second cutting unit 300 cuts into one or a plurality of second products 12 having a maximum size and / or a maximum area yield in consideration of the defect distribution (position) of the product 11d . To this end, the second cutting unit 300 may include a product selecting unit (not shown) for selecting the second product 12 having the largest size and / or the largest area yield in consideration of the defect distribution of each extracted product 11d 310 and a cutting device 320 for cutting the second product 12 having a maximum size and / or a maximum area yield according to a result of the product selection part 310. [

The cutting device 320 includes a support means (not shown) for supporting the product 11d and a cutting means 322 for cutting the product 11d into the second product 12, . At this time, the supporting means and the cutting means 322 are the same as those of the first cutting unit 100. The cutting means 322 may have a structure including at least one selected from the metal knife, the jet water knife, and the light source (laser beam irradiator, etc.).

According to one embodiment, the cutting device 320 may cut a plurality of second products 12 having different sizes. To this end, the cutting device 320 includes a light source (laser beam irradiator or the like) as the cutting means 322, and the light source may be capable of adjusting the area (size) of the cutting line. In another example, the cutting device 320 may include a plurality of cutting means 322 of different sizes. At this time, the plurality of cutting means 322 can be selected from, for example, a metal knife cutter or the like. Fig. 4 illustrates a cutting apparatus 320 including a plurality of cutting means 322. As shown in Fig.

4, the second cutting unit 300 includes a product selecting unit 310 and a cutting unit 320. The cutting unit 320 may include a plurality of cutting units 322 . The cutting means 322 may include a first cutting means 322, a second cutting means 322, a third cutting means 322, and an n-th cutting means 322 as n pieces. The plurality of cutting means 322 may have a size of the first cutting means 322> the second cutting means 322> the third cutting means 322> the n-th cutting means 322 . In this case, n is an integer of 2 or more, and the upper limit value of n is not limited, but may be 20 or less, 10 or less, or 5 or less, for example.

For example, as shown above, there are products A, B, C, D and E that can be cut with respect to the fabric 10, and the sizes of these products are A> B> C> D> E Product. As a result of calculating the area yield for each product, if the product having the largest area yield is product A, the first product 11 is cut to the size of product A as the first product 11. Thereafter, the combined product extracting unit 200 checks each of the cut first products 11 for a defect d to judge whether the product is a good or small product 11d, and extracts the product 11d. The product selection unit 310 determines the size and / or number of the second product 12 having the maximum size and / or the largest area yield among the products B to E, taking into account the defect distribution of each product 11d . Thereafter, the cutting device 320 cuts the product 11d in size and / or number of the second product 12 selected by the product selecting part 310 to obtain the second product 12.

At this time, the cutting means 322 is selected according to the result selected by the product selecting unit 310. For example, as described with reference to Fig. 2, the second product 12 that can maximize the area "S" in Fig. 2 is one product B, and among the plurality of first to n-th cutting means 322 If the cutting means 322 corresponding to the size of the product B is the first cutting means 322, the piece 11d shown in Fig. 2 is cut by the first cutting means 322. [ As described with reference to Fig. 3, the second product 12 capable of maximizing the area "S" is a combination of one product D and one product E, and the plurality of first to n-th cutting means 322 3 and the cutting means 322 corresponding to the size of the product E are the third cutting means 322 and the fourth cutting means 322, 4 Cut with cutting means 322.

The cutting device 320 may include a controller 323 for automatically selecting the cutting means 322 and automatically operating the cutting means 322 based on a result selected by the product selecting unit 310, As shown in FIG. Specifically, in the above example, when the product selecting unit 310 selects one product B as the second product 12, the controller 323 selects one of the plurality of cutting means 322, The operation of the first cutting means 322 can be controlled.

According to one embodiment, the cutting device 320 includes a plurality of cutting means 322 of different sizes, a carrier 324 for moving the respective cutting means 322, And a controller 323 for controlling the controller 324. At this time, the cutting means 322 can be moved vertically and horizontally (vertically and horizontally) by the carrier 324. An exemplary embodiment of the cutting device 320 is shown in Fig. Fig. 5 shows a cutting device 320 provided with two cutting means 322 and two carriers 324 for moving the respective cutting means 322. Fig.

5, the carrier 324 may move the cutting means 322 at least in the x-axis (right and left) and the z-axis (up and down) in the x-y-z axial space. The carrier 324 can also cause the cutting means 322 to move in the x-axis and the z-axis as well as the y-axis. The carrier 324 includes a vertical moving means 324a for moving the cutting means 322 in the z-axis direction (vertical direction), a horizontal moving means 324b for moving the vertical moving means 324a in the x- And a rail member 324c for moving the horizontally moving member 324b in the y-axis direction.

The vertical movement means 324a may include an actuator that operates with electricity, hydraulic pressure, and / or pneumatic pressure. The vertical moving means 324a may include, for example, a vertical axis moving member coupled to the cutting means 322 for moving vertically and an electric motor for transmitting power to the longitudinal moving member. 5, the vertical moving means 324a includes a hydraulic or pneumatic cylinder operated by hydraulic pressure or pneumatic pressure, and a piston rod (not shown) driven vertically by the driving of the oil / and a piston rod.

5, the vertical moving unit 324a may be moved along the guide groove 324b-1 of the horizontal moving member 324b in the x-axis direction. The horizontal moving member 324b can be moved in the y-axis along the sliding groove 324c-1 of the rail member 324c. At this time, the x-axis movement of the vertical movement means 324a and the y-axis movement of the horizontal movement member 324b can be realized by an actuator (not shown) as illustrated above.

The vertical moving means 324a and the horizontal moving member 324b are controlled by the controller 323. [ Accordingly, the cutting means 322 can be freely moved in the x-y-z axial space by the operation of the carrier 324 through the controller 323. [ The carrier 324 is not limited as long as the cutting means 322 causes the x-y-z axial solid space to be moved, which may have another structure, for example, a robot structure. Further, the controller 323 is not limited as long as it can control the operation of each carrier 324. The controller 323 may include, for example, a PLC (Programmable Logic Controller) which is widely used for controlling a general machine.

Therefore, when the second product 12 having the maximum size and / or the largest area yield is selected in the product selection unit 310, the operation of the carrier 324 through the controller 323 allows the maximum size and / The second product 12 having an area yield can be automatically cut.

As described above, according to the present invention, it is possible to produce a good product of a predetermined size through down-sizing without discarding the product 11d generated at the time of cutting the cloth 10. Thus, the fabric 10 can be cut with a maximum area yield (good yield). INDUSTRIAL APPLICABILITY The present invention can be usefully applied in, for example, technical fields such as various display industries, optical industries and film manufacturing industries.

10: Fabric 11: First product
11d: Shortage 12: Second Product
100: first cutting unit 200: defective product extracting unit
210: defect inspection section 220: product determination section
300: second cutting unit 310: product selecting unit
320: Cutting device 322: Cutting means
323: Controller 324: Carrier
d: defect

Claims (11)

A first cutting step of cutting the fabric into a plurality of first products;
A defective product extracting step of extracting a defective product having defects from the plurality of first products obtained in the first cutting step; And
And a second cutting step of cutting the defective product extracted in the defective product extraction step so as to avoid defects to obtain a second product smaller than the size of the first product. The method according to claim 1,
The defect product extracting step may include defect inspection step of inspecting defects for each of the plurality of first products; And
And a product judging step of judging whether the product is a good product or a short product based on the inspection result of the defect inspection step. The method according to claim 1,
And the second cutting step is performed by cutting out a second product having a maximum size in consideration of a defect distribution of the extracted defective product. The method according to claim 1,
And the second cutting step is performed by cutting one or a plurality of second products having the largest area yield in consideration of defect distribution of the extracted defective products. A first cutting unit for cutting the fabric into a plurality of first products;
A defective product extracting unit for extracting a defective product having defects from a plurality of first products obtained by the first cutting unit; And
And a second cutting unit for cutting the defective product extracted by the defective product extracting unit so as to avoid defects to obtain a second product smaller than the size of the first product. 6. The method of claim 5,
The defective product extracting unit includes a defect inspection unit for inspecting a plurality of defects for each first product; And
And a product judging section that judges whether the product is a good product or a short product based on the inspection result of the defect inspecting section. 6. The method of claim 5,
A second selecting unit for selecting a second product having a maximum size in consideration of a defect distribution of the defective product extracted by the defective product extracting unit; And
And a cutting device for cutting the second product into a second product having a maximum size according to a result of the product selecting section. 6. The method of claim 5,
A product selecting unit for selecting a second product having a maximum area yield in consideration of a fault distribution of the defective product extracted by the defective product extracting unit; And
And a cutting device for cutting one or a plurality of second products having a maximum area yield according to a result of the product selecting section. 6. The method of claim 5,
And the second cutting unit includes cutting means capable of cutting a plurality of second products having different sizes. 6. The method of claim 5,
And the second cutting unit includes a plurality of cutting means having different sizes. 6. The method of claim 5,
The second cutting-
A plurality of cutting means having different sizes;
A carrier for moving each of the cutting means; And
And a controller for controlling the carrier.

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