KR101688737B1

KR101688737B1 - Method and system for producing cutting product

Info

Publication number: KR101688737B1
Application number: KR1020150098146A
Authority: KR
Inventors: 이규황; 이호경
Original assignee: 주식회사 엘지화학
Priority date: 2014-07-11
Filing date: 2015-07-10
Publication date: 2016-12-22
Also published as: KR20160007429A; CN106663285A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a production method of a cut product and a production system of the cut product and more particularly to an area yield calculation step and an area yield step of calculating the number of strips and the strip width, And a cutting step of slitting the fabric in the longitudinal direction by the number of strips and the width of the strip calculated in the step of cutting the strip to obtain a plurality of strips.

Description

TECHNICAL FIELD [0001] The present invention relates to a production method and a production system for a foundation product,

The present invention relates to a production method and a production system of a cut product.

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, if there is a scratch on the roll, a periodic defect may occur in a region contacting with the roll due to the nature 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 defects, defect inspection is performed prior to cutting, and cuts are made to avoid defects so that defects are not included in the cut unit products. 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 in which the yield is determined to be higher than a predetermined value (highest yield) based on the calculated value.

For example, Korean Patent Laid-Open 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, in the cutting method according to the prior art, for example, the following problems are pointed out.

In recent years, most fabrics have been manufactured in very large sizes. This also takes into account factors such as the efficiency of fabric manufacturing process and the fluctuation of demand for products. For such large width fabrics, a slitting cut in the lengthwise direction of the fabric may be required. However, the cutting method according to the prior art is confined to the cutting of a unit product for the greatest area yield, and the slitting cutting is not considered. As a result, it is difficult to see the method considering the maximum cutting efficiency.

On the other hand, the business purpose of the product supplier (manufacturer) can be regarded as profit. However, the cutting method according to the prior art does not consider profit. Specifically, the cutting method according to the prior art is cut by simply considering the area yield of the unit product in order to minimize the amount of scrap to be discarded. However, this has the problem that the profitability is low in some cases.

The present invention provides a production method of a cut product and a production system of a cut product that can maximize the area yield of the fabric.

It is another object of the present invention to provide a production method of a cut product and a production system of a cut product that can cut a fabric based on at least one of area yield and profitability.

It is another object of the present invention to provide a production method of a cut product and a production system of a cut product which can calculate a profitable cutting method.

According to an aspect of the present invention, there is provided an area yield calculating step of calculating a number of strips and a width of a strip such that an area yield is equal to or greater than a predetermined value when a fabric is cut. And a cutting step of slitting the fabric in the longitudinal direction by the number of strips and the width of the strip calculated in the area yield step to obtain a plurality of strips.

According to still another aspect of the present invention, there is provided a method of fabricating a yarn, comprising: an area yield calculating step of calculating an area yield of a raw fabric varying according to a cutting method of a fabric; A profit calculating step of calculating a profit of the product which changes according to the cutting method of the fabric; And a cutting step of cutting the fabric in a cutting method based on at least one of the calculated area yield and the calculated profit of the product.

According to still another aspect of the present invention, there is provided an area yield calculating unit for calculating the number of strips and the width of the strips so that the area yield is equal to or greater than a predetermined value at the time of cutting the fabric, There is provided a production system for a cut product which comprises a cutting section for slitting and cutting a raw fabric in the longitudinal direction by the number and the width of the strip to obtain a plurality of strips.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to provide a method of producing an improved cut product and a production system of the cut product.

Also, the number of strips and the width of the strips that can maximize the area yield can be calculated to perform the slitting cutting.

Also, the profitability of the product supplier (manufacturer) can be improved.

1 is a plan view showing a fabric.
2 is a plan view for explaining a cutting method of a fabric according to an embodiment of the present invention.
3 to 5 are plan views for explaining a method of cutting a fabric according to another embodiment of the present invention.
6 is a plan view for explaining a production method of a cut product according to an embodiment of the present invention.
7 is a plan view for explaining a production method of a cut product according to another embodiment of the present invention.
8 to 10 are plan views for explaining a production method of a cut product according to still another embodiment of the present invention.
11 is a configuration diagram showing a production system for a cut product according to an embodiment of the present invention.
12 is a configuration diagram showing a production system for a cut product according to still another embodiment of the present invention.

Hereinafter, a production method of a cut product and a production system of a cut product according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In addition, the same or corresponding reference numerals are given to the same or corresponding reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. For convenience of explanation, the size and shape of each constituent member shown in the drawings are exaggerated or reduced .

In this document, the "fabric" to be cut is a base material on a film (or sheet), which is included in the base material if it has a relatively large size before the cutting. In this document, the kind of the fabric 10 and the laminated structure are not particularly limited. The fabric 10 can be selected from an optical member or a protective member on a film (or sheet), for example, applied to an electric or electronic product or the like. The fabric 10 may be selected from optical members applied to a more specific example, a display device such as a TV or a monitor. Further, the fabric 10 includes a single layer body and / or a laminate body.

In one example, the fabric 10 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 10 may be, for example, in the form of a strip, which can be drawn out while being wound on a roll. The width X and the length Y of the fabric 10 are not limited. The fabric 10 may have a width X of, for example, 40 mm to 2,500 mm and a length Y of 1,000 cm to 3,000 m.

Further, in this document, the fabric 10 to be cut includes the defect d, and / or the defect d does not exist. The defect (d) is an unfavorable defect point in the product, which may be formed in the manufacturing process of the fabric 10 and / or the winding process. Defects include, for example, foreign matter, contamination, twisting, scratches, and / or bubbles.

In the accompanying drawings, "*" represents defect (d). The fabric 10 may have one or more of the above-mentioned defects (d), but in the drawings, the type of defects (d) is not taken into account and is denoted by "* ".

On the other hand, in this document, "cutting" can be used to mean one or more selected from among "slitting cutting" and "unit cutting ". In the present document, the term "slitting cutting" means that the raw material 10 is cut into a strip-shaped semi-finished product by cutting the raw material 10 in the direction of the length (Y) (Y) direction and the width (X) direction and cut into a unit product. At this time, in this document, the strip-shaped semi-finished product obtained through the slitting cut is referred to as a 'strip', and the cut product obtained through the unit cut is referred to as 'single product'.

In addition, the single item is a single end product having a length and a width smaller than the raw material 10, which may have, for example, a rectangular shape. 2, the strips 11, 12 and 13 are band-shaped semi-finished products having a width smaller than that of the fabric 10, which can be cut into a single piece by unit cutting have. 2 shows a state in which the fabric 10 is slit-cut and divided into a first strip 11, a second strip 12 and a third strip 13.

In this document, the cutting method is not particularly limited. The cutting method may be such that the cloth 10 can be divided into at least one piece and / or strips 11, 12, 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.

On the other hand, in this document, the "area yield" means that the total area of the cut products obtained after cutting is calculated by dividing the total area of the cutting front fabric 10 by the total area. The area yield can be expressed as a percentage (%) as usual. At this time, the cut product is selected from the single product and / or the strips 11, 12 and 13. The total area of the cut products is calculated as the area of one cut product x the number of cut products produced.

In this document, "size" means one or more selected from the width, length, area, and diagonal length of the fabric 10 or the cut product (piece and / or strip). In this document, "size" is used in the same meaning unless otherwise stated in the following embodiments. Further, "inch" 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 square single piece such as a polarizing plate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the embodiments of the present invention, detailed description of known functions and configurations will be omitted. In the embodiments illustrated below, the same terms and reference numerals denote the same functions. In addition, since the parts described in any one embodiment are used in accordance with the other embodiments, explanations of parts overlapping as much as possible are omitted. For example, when the portion described in the first embodiment is not described in the second embodiment, the second embodiment includes the portion described in the first embodiment. In addition, if there is a part which is not described in the first embodiment, the part described in the second embodiment is included.

The method of producing a cut product according to an embodiment of the present invention includes an area yield calculating step of calculating the number of strips and the width of the strip such that the area yield is equal to or greater than a predetermined value at the time of cutting the raw fabric. The production method of the cut product includes a cutting step of slitting the fabric in the longitudinal direction by the number of strips calculated in the area yield step and the width of the strip to obtain a plurality of strips.

Also, the area yield step can be performed by calculating the number of strips and the width of the strip such that the S value according to the following general formula 1 has a minimum value.

[Formula 1]

In the general formula 1, X is the width of the fabric, n is the number of strips, and W is the width of each strip. Also, the S value can be calculated while varying at least one of the number of strips and the width of the strip. In addition, the width of the strip may be set equal to the width or length of the unit product produced in each strip.

In addition, the cutting step may further comprise arranging the position of each strip based on the defect distribution of the fabric.

Further, the area yield may be selected according to various criteria such as 80% or more, 90% or more, or 95% or more, for example. Further, the area yield calculating step can be performed by calculating the number of strips and the width of the strips that maximize the area yield.

Hereinafter, a method of producing a cut product will be described in detail with reference to the accompanying drawings.

One fabric 10 is shown in Figures 1 and 2. The fabric 10 has a strip shape, for example, wound on a roll. The fabric 10 may have a large width X. The fabric 10 may have a width X of, for example, 1,000 mm or more, for example, 1,200 mm to 2,500 mm. The length Y of the fabric 10 is not limited, but may have a length Y of 1,000 cm to 3,000 m, for example. However, the width X and the length Y of the fabric 10 are not limited to the above range. The fabric 10 shown in Figs. 1 and 2 is in an unfolded form, showing a part of the overall length Y. Fig.

As described above, with respect to the fabric 10 having the longest width X, the slit cutting and the unit cutting may be progressed sequentially, which may be advantageous in the process than in the case of the unit cutting alone. A plurality of strips 11 and 12 having a width W smaller than the width X of the raw fabric 10 by slitting the raw fabric 10 in the direction of the length Y prior to the unit cutting, (13). Thereafter, each of the strips 11, 12, and 13 is cut into single pieces through a unit cut. In addition, each of the divided strips 11, 12, 13 may be cut into a single piece at the request of a consumer after being wound on a roll. At this time, the width W of each of the strips 11, 12, 13 may be equal to or larger than the size (width and / or length) of the final product, i.e.,

In the fabric 10, the area S1 that can be produced can be represented by the following general formula 5, for example.

[Formula 5]

S1 = (X-Z) Y

In the general formula 5, X is the total width of the fabric 10, Y is the length of the fabric 10, and Z is the width at which the fabric is lost during cutting.

The area yield can be maximized by setting the S1 value of the general formula 5 to the maximum value {Max [(X-Z) Y]} in the slitting cutter 10 of the fabric 10. At this time, according to the present embodiment, a combination of the number of slitting lines and the product size (width) is considered as a factor that can maximize the area yield.

Specifically, the fabric cutting method of the present invention calculates the number of strips 11, 12, 13 and the widths of the strips 11, 12, 13 that maximize the area yield according to the first embodiment Calculating an area yield; And the number of the strips 11, 12, 13 calculated in the area yield calculation step and the width of the strips 11, 12, 13 are cut by slitting the cloth 10, (12) and (13). The widths of the strips 11, 12 and 13 may be the same as the widths and / or lengths of the strips 11, 12 and 13, respectively.

The method for cutting a fabric according to the present invention includes: an area yield calculating step of selecting a cutting method in which an S value according to the following general formula 1 is the minimum value; And a cutting step of slitting the fabric in the longitudinal direction according to the selected cutting method to obtain a plurality of strips.

[Formula 1]

In the general formula 1, X is the width of the fabric 10, n is the number of the strips 11, 12, 13, and W is the width of each of the strips 11, 12, In the general formula 1, n is an integer of 2 or more, and the maximum value of n is not limited. n may be arbitrarily set, for example, arbitrarily, depending on the type of product (or fabric) and / or the customer's request, which may be 2 to 50, or 2 to 20 in one example.

In the area yield calculation step, the S value of the general formula 1 can be calculated while changing the number of the strips 11, 12, 13 and / or the widths of the strips 11, 12, 13. The widths of the strips 11, 12 and 13 are determined by the widths of the strips 11, 12 and 13, (Width < / RTI > and / or length). The number of strips 11, 12, 13 and the widths of the strips 11, 12, 13 that minimize the S value according to the general formula 1 are calculated, Cutting can maximize area yield. For the sake of explanation, it is assumed and exemplified as follows.

It is assumed that the cloth 10 shown in Fig. 1 is slitted by five strips having different widths, for example. Specifically, it is assumed that the cloth 10 is slit-cut into five strip products A, B, C, D, and E, respectively. Further, it is assumed that the width of each strip is A product> B product> C product> D product> E product. In addition, the width of each strip may be the same as the size (width and / or length) of the single piece produced from the strip in question.

In the case of slitting and cutting the fabric 10 into five strips, various combinations are possible. The number of cases of all possible combinations can be expressed by the following general formula (6).

[Formula 6]

X = S2 - _(A W N _A + N _B + W _B W _C N _C + W _D + W _D N _E N _E)

Table 1 below illustrates some of the possible combinations. In Table 1 below, the area yield for each case is assumed as an example. "A x 1 + B x 2" means a case where one row of product A and two rows of product B are combined, and the rest are the same. As assumed in Table 1 below, in all combinations, the best area yield can be obtained in case of cutting one line of product A and two lines of product B (case 1).

<Results of area yield calculation based on cutting method> division Foundation method Area yield (%) ranking case 1 A x 1 + B x 2 96 One case 2 A x 2 + D x 1 94 2 case 3 A x 1 + B x 1 + C x 1 92 3 case 4 A x 2 + E x 1 90 4 case 5 A x 1 + B x 1 + D x 1 89 5 case 6 A x 1 + C x 2 87 6 case 7 A x 1 + C x 1 + D x 1 86 7 case 8 A x 1 + B x 1 + E x 1 84 8

The cutting type (case 1) having the highest area yield can be calculated by the general formula (6). Therefore, when cutting the fabric 10 in the form of minimizing the S2 value based on the result calculated by the general formula 6, the maximum area yield can be obtained in all the cases.

Fig. 2 shows the above-mentioned optimum cutting form. In Fig. 2, W _A is the width of the A product, and W _B is the width of the B product. That is, FIG. 2 is a sectional view showing a cut shape in which the area yield is maximized during the slitting cutting in the length (Y) direction with respect to the raw cloth 10 having the entire width X and the entire length Y, (case 1), which shows that the product is cut into one line of product A and two lines of product B.

The above general formula (6) can be expressed by the general formula (1). In this case, the general formula 1 can be applied to any n products in all cases where the widths of the strips 11 and 12 are the same or different. In the above general formula 1, X is the width of the fabric 10, which can be predetermined.

Therefore, the area yield can be maximized by calculating the cutting form that minimizes the S value according to the general formula (1). Specifically, the S value of the general formula (1) is calculated while varying the number of strips (11) (12) (13) and / or the number of strips (11) Of the calculated S values, it is possible to obtain the maximum area yield when the number of the strips 11, 12, 13 and / or the number of the strips 11, 12, 13 that minimize the S value is reduced .

Hereinafter, an embodiment capable of maximizing the quality (good quality) in consideration of the defect d of the raw material 10a will be described.

As exemplified above, it is assumed that the cutting form that maximizes the area yield with respect to the fabric 10 is one line of product A and two lines of product B, respectively. At this time, when defect (d) exists in fabric 10, cutting is performed taking into consideration the distribution (position) of defect (d) for good production. Specifically, when the cutting method (cutting type) for maximizing the area yield is determined according to the above method, the cutting is performed in the cut form, and the cut positions of the strips 11, 12, 13 And then cut to obtain the best area yield and good quality.

Referring to FIG. 3 to FIG. 5, the yield rate may vary depending on where one row of product A and two rows of product B are located. In the present invention, the "positive product rate" means the area yield in consideration of quality improvement.

As shown in Figs. 3 to 5, since the distribution of defects (d) may be different for each line, the one product A and the two products B are cut to have the highest yield rate. More specifically, in this embodiment, as described above, when the cutting form that maximizes the area yield is determined, the strips 11, 12, 13 are formed in consideration of the area yield (the yield rate) Are arranged and cut. As a result, it is possible to achieve the best area yield with the highest area yield.

FIGS. 3 to 5 illustrate the assumption of the flatness ratio according to the arrangement of one line of product A and two lines of product B. FIG. 3 to 5, the optimal cutting form may be the arrangement of FIG. That is, when cutting is performed in the order of one row of the A product, one row of the B product, and one row of the B product from the left side, the best area yield and the good yield can be obtained.

Further, the defect (d) can be inspected by the inspector or the defect inspection apparatus before the cutting. In the present invention, the inspection method of the defect (d), the dataization of the defect information, and the utilization thereof are not particularly limited, and this can be performed by a conventional method, for example.

As described above, in order to minimize the amount of scrap to be discarded, the area yield of the unit product obtained after the cutting can be taken into consideration. However, since the area yield is high, it does not necessarily have a high profit. For example, the area and price of a product are not necessarily proportional.

For example, if the product is cut into "A" with an area of "A" for a certain fabric, the area yield is 95%, and the product 2A having an area twice as large as the "A" , It is assumed that the area yield is 93%. At this time, when the price of the product A is 1 won, the price of the product 2A is not necessarily 2 won, which is more expensive than 2 won in most cases. In this case, it is advantageous from profitability that the product supplier cuts the product to the size of "Product 2A" rather than "Product A". That is, in order to select the cutting method (method), it may be desirable that both the area yield and the profitability are considered together.

A method of producing a cut product in accordance with another embodiment of the present invention includes calculating an area yield calculating step of calculating an area yield of a fabric varying in accordance with a cutting method of a fabric and calculating a profit of a product that changes according to a cutting method of the fabric And a profit calculation step. In addition, the production method of the cut product includes a production step of the cut product including a cutting step of cutting the fabric in a cutting method based on at least one of the calculated area yield and the calculated profit of the product.

Here, the cutting step may be such that even if the area yield calculated by the first cutting method is lower than the area yield by the second cutting method, the profit of the product calculated by the first cutting method is smaller than the yield of the product calculated by the second cutting method If it is large, it can be performed by cutting the fabric with the first cutting method.

In addition, the cutting step can be performed by cutting the cloth in a cutting method in which the profit of the product calculated in the profit calculating step shows the maximum value.

The product to be cut may be a single piece obtained by cutting the raw fabric in the longitudinal direction and the width direction, respectively, or a band-shaped strip obtained by cutting the raw fabric in the longitudinal direction.

In addition, the profit of the product can be calculated by the following formula 2.

[Formula 2]

In the general formula 2, n is the number of products to be cut, and P is the price of each product cut.

Alternatively, the profit calculation step may be performed based on the following general formula (3). In the cutting step, a plurality of strips are obtained by slitting the fabric in the longitudinal direction according to a cutting method in which the value of M is the maximum, and a step of cutting the cut plural strips in the width direction to obtain a single product .

[Formula 3]

In the above general formula 3, n is the number of strips, T is the number of individual articles produced in each strip, and P is the price of the individual articles produced in each strip. Also, the value of M can be calculated by varying the width of the strip and / or the number of strips. In addition, the width of the strip can be set equal to the width or length of the single article. In addition, the step of obtaining a plurality of strips may further include the step of arranging the positions of the respective strips in accordance with the defect distribution of the fabric.

On the other hand, the profit calculating step may be performed based on the following general formula (4).

[Formula 4]

Where m is the number of fabrics, n is the number of strips produced at each fabric, T is the number of individual articles produced in each strip and P is the price of the individual articles produced in each strip.

Here, the cutting step may include a fabric selecting step of selecting a fabric according to a cutting method in which the value of R is the maximum value; A step of slitting and cutting the selected fabric in the longitudinal direction to obtain a plurality of strips, and a step of cutting each of the plurality of strips obtained in the width direction to obtain a single product.

Further, the R value can be calculated while varying the width of the strip and / or the number of strips. In addition, the width of the strip can be set equal to the width or length of the single article. In addition, the step of obtaining a plurality of strips may further include the step of arranging the positions of the respective strips in accordance with the defect distribution of the fabric.

On the other hand, the area yield calculation step may be performed by calculating the number of strips and the width of the strip such that the area yield is equal to or greater than a predetermined value, and the area yield calculation step is performed in the same manner as described with reference to Figs. 2 to 5 .

A method of producing a cut product for improving profitability includes: a profit calculating step of calculating a profit of a product that changes according to a cutting method of the fabric 10, according to the first embodiment; And a cutting step of cutting the fabric 10 by a cutting method in which the profit of the product calculated in the profit calculating step indicates a maximum value.

The profit calculating step can calculate the profit of the product that changes according to the cutting method when the fabric 10 is cut. In the present invention, "revenue of a product that changes according to a cutting method" may mean a profit that can be changed according to, for example, selection of a cut product and / or selection of the cloth 10. The selection of the cut product may be made, for example, by selecting the size and / or the number of the product to be cut (produced by the cutter), and the selection of the cut 10 may be performed by roll selection. Generally, the roll selection is based on the size of the fabric 10, the number of fabrics 10, the quality of the fabric 10, and / or the quality of the fabric 10, (Or production date) of the product. Also, in the present invention, the profit calculation can be calculated based on the price (sales price) of the product to be cut.

In one example, the revenue of the product may be calculated via the following equation (2).

[Formula 2]

In the profit calculating step, for example, when the cloth 10 is cut into n products (n > = 2), the product obtained from the cloth 10 on the basis of the prices of the n products to be cut You can calculate the total revenue you have. Here, "n products" may be two or more products, and they may be the same or different in size. Further, in the above "n products", n may vary depending on the size of the fabric 10 and / or the size of each product produced from the fabric 10, so the upper limit of n is not limited. Although not particularly limited, n may be, for example, 5 million or less, or 1 million or less. Further, in the "n products ", the product can be selected from the single product 10a and / or the strips 11, 12 and 13 as mentioned above.

Hereinafter, with reference to Fig. 6, embodiments of the present embodiment will be described by taking, as an example, a case in which the cloth 10 is cut into a plurality of pieces 10a. Specifically, in the present embodiment, a case where a plurality of individual articles 10a are obtained by unit cutting in the width X direction and the length Y direction of the fabric 10 is illustrated.

One fabric 10 is shown in Fig.

It is assumed that a single piece 10a having a size (area or inch) different from that of the raw material 10 is cut into, for example, a product A, a product B, or a product C (case). It is also assumed that the size of each individual product 10a is product A <product B <product C. And the prices of the individual items 10a are different from each other.

With respect to the fabric 10, the area yield for each product can be calculated. The area yield can be calculated, for example, by dividing the total area of the cut single piece 10a cut by the total area of the cutting front fabric 10 when the cutting is performed virtually as in the normal case. As a result of calculating the area yield for each product in this way, it is assumed that the area yield is as shown in the following [Table 2], for example. That is, as shown in Table 2 below, product A has the highest area yield at a yield of 96% at the time of cutting, and the specific product ranking is A product (area yield 96%), product B Area yield: 93%) and C product (area yield: 89%).

&Lt; Results of calculating the area yield according to the cutting type & division
Single x number Area yield (%) ranking case 1
A x 30 96 One case 2
B x 25 93 2 case 3
C x 12 89 3

In case of cutting the fabric 10, considering the area yield, case (case 1) may be optimal in the case of cutting to the smallest size A product as described above. However, if you consider the profit, the rankings may be different. Specifically, when the profit is calculated in consideration of the price (sales price) of each product after the cutting, for example, the results shown in Table 3 below can be shown.

<Result of profitability calculation according to foundation type> division
Single x number Revenue (Unit: 10,000 won) ranking case 1
A x 30 1842 2 case 2
B x 25 1968 One case 3
C x 12 1820 3

The ranking is different considering the profit as above. That is, as shown in Table 3, considering the profit, it is optimal to cut the product into a medium size B product (case 2). This is because, as mentioned above, the size (area or inch) of the product and the price are not necessarily proportional.

In this embodiment, it is cut considering the profit of each product (size) as described above. Specifically, in this embodiment, when the cloth 10 is virtually cut, the profit according to the size of the product to be cut is calculated. For example, when the fabric 10 is virtually cut into n products, the profit for each product is calculated on the basis of the prices of the n products to be cut. Here, n products are products having different sizes (areas or inches), which may be arbitrarily assumed or arbitrarily determined depending on the kind of the product (or fabric) and / or the demand of the consumer. In the examples shown in [Table 2] and [Table 3], n products are 30 in case of A product.

For example, polarizers have different price (price) depending on size (area or inch). Further, the polarizing plate, when the size (area or inch) is doubled, the price exceeds twice. For example, in the case of a polarizer having a size of 55 inches, 47 inches and 42 inches, the price (sales price) differs for each inch, and a 55 inch polarizer may be twice as high as a 42 inch polarizer, for example. Based on this price (sales price), the profit for each product is calculated.

In this embodiment, the profit may mean a value obtained by subtracting the production cost of the product from the price of the product obtained after the cutting. Further, the price is a price at the time of cutting, which may be a sale price when a product to be cut is supplied to a consumer. In addition, the production cost may mean a cost including manufacturing cost of the fabric 10. The production cost may further include, for example, the cutting cost (estimated cost) required for the cutting process in the manufacturing cost of the fabric 10. The revenue can be calculated, for example, by the following general formula 7 or 8.

[Formula 7]

Revenue = P x N - Q

[Formula 8]

Revenue = P x N - (Q + R)

In the above general formulas 7 and 8, P represents the price (sales price) of one of the cut products, N represents the number of cut products produced by the cutting, Q represents the manufacturing cost (manufacturing cost) Represents the cutting costs incurred in the cutting process.

In addition, the profit can be calculated through a profit calculator, for example. At this time, price information according to the size of each product and manufacturing cost (manufacturing cost) of the fabric 10 can be input to the profit calculator. In some cases, the profit calculator may be further fed with the cutting costs incurred in the cutting process.

After calculating the profit for each product as above, we cut the product (size) with the highest profit from the calculated profit. For example, among products A, B, and C of Table 3, it is cut into a B product (medium size) having the highest profit. Accordingly, it can be matched to the business purpose of a product supplier (manufacturer) for profitability purposes.

On the other hand, when the defect (d) exists in the fabric (10), the defect (d) is avoided in order to obtain a good quality (good quality). Specifically, when the product (size) that maximizes the profit is determined according to the above method, the fabric 10 is cut with the product (size) of the highest profitability, and the cut is made avoiding the defect (d). For example, in Table 3, product B has the highest profit. Thus, the fabric 10 is cut into a B product, which is cut by avoiding a defect (d), thereby achieving high profitability and productivity.

Further, the defect (d) can be inspected by the inspector or the defect inspection apparatus before the cutting. In the present embodiment, the inspection method of the defect (d), the data conversion of defect information, and the utilization thereof are not particularly limited, and they can be performed by a conventional method, for example.

In addition, when the fabric 10 is cut into the single piece 10a, it can be cut at a predetermined inclination angle, for example. Fig. 6 shows such a cutting form. Specifically, as shown in Fig. 6, a plurality of individual articles 10a can be cut using the cutting frame F, and cut so as to have a predetermined inclination angle with the length Y direction of the raw material 10. For example, the longitudinal direction of the single article 10a may have an acute angle of 45 degrees with the length (Y) direction of the raw fabric 10.

In the first embodiment, the case where the fabric 10 is cut into a plurality of individual articles 10a has been described as an example. In the present embodiment, a description will be given taking as an example a case where the raw fabric 10 is cut into a plurality of strips 11, 12, Specifically, in this embodiment, a case is shown in which strips 11, 12, and 13 in strip form are obtained by cutting the raw fabric 10 long in the direction of the length (Y). In this embodiment, a method of maximizing the area yield is also provided.

Figs. 2 and 7 illustrate two cases in which the cutting form is different. Fig. 2 shows a cut-off configuration maximizing the area yield, and Fig. 7 illustrates a cut-off configuration maximizing profitability.

Referring to Figs. 2 and 7, in the present embodiment, the raw material 10 has a band shape and can have a wide width X.

As described above, with respect to the fabric 10 having the longest width X, the slit cutting and the unit cutting may be progressed sequentially, which may be advantageous in the process than in the case of the unit cutting alone. A plurality of strips 11 and 12 having a width W smaller than the width X of the raw fabric 10 by slitting the raw fabric 10 in the direction of the length Y prior to the unit cutting, (13). Then, each of the strips 11, 12, and 13 is cut into a single product 10a through a unit cut. In addition, each of the divided strips 11, 12, 13 may be cut into a single piece 10a at the request of the consumer after being wound on a roll. At this time, the width W of each of the strips 11, 12, and 13 may be equal to or greater than the size (width and / or length) of the final product, that is, the single product 10a.

According to the second embodiment, a profit calculating step of selecting a cutting method in which an M value of the following general formula 3 represents a maximum value; A first cutting step of slitting the fabric 10 in the longitudinal direction according to the selected cutting method to obtain a plurality of strips 11, 12, 13; And a second cutting step of cutting the obtained plurality of strips 11, 12, 13 in the width direction to obtain a single article 10a.

[Formula 3]

In the general formula 3, n is the number of the strips 11, 12, 13, T is the number of the individual articles 10a produced in each strip, P is the price of the single article 10a produced in each strip to be.

According to the present embodiment, it is possible to realize a cutting form having the highest profitability through the general formula (3). For the purpose of illustration, the following is exemplified.

In the fabric 10 shown in Figs. 2 and 7, the area that can be produced can be represented by, for example, the above-described general formula 5.

The area yield can be maximized by setting the S1 value of the general formula 5 to the maximum value {Max [(X-Z) Y]} in the slitting cutter 10 of the fabric 10. At this time, according to the present embodiment, a combination of the number of slits (number of lines) and the size of the single article 10a is considered as a factor that can maximize the area yield. More specifically, according to one embodiment of the present invention, the number of strips 11, 12, 13 (the number of lines generated after slitting cutting) and the number of strips 11, 12, 13 If it is specified which one component 10a of which size is to be used, the area yield can be maximized. For the sake of explanation, it is assumed and exemplified as follows.

It is assumed that slitting cutting is performed with the products A, B, C, D and E with respect to the cloth 10 shown in Fig. Further, it is assumed that the width of each strip is A product> B product> C product> D product> E product. And each strip is different price. At this time, the price of each strip can be calculated by the price (sales price) of the single article 10a produced from the strip. In this case, the width of each strip is determined by the size of the single article 10a Or length).

Various combinations are possible for the slitting cutter 10 of the fabric 10.

As described above, Table 1 exemplifies some of all possible combinations. In Table 1, the area yield for each case is assumed as an example. Also, as assumed in [Table 1], in the case of all combinations, it is possible to obtain the best area yield in case of cutting one line of product A and two lines of product B (case 1).

The cutting type (case 1) having the highest area yield can be easily calculated through the above general formula (1). Therefore, when cutting the fabric 10 based on the result calculated through the general formula 1, the maximum area yield can be obtained in all the cases.

Fig. 2 shows the above-mentioned optimum cutting form. In Figure 2, W _A is the width of the A product, W _B is the width of the B product, and Z is the width at which it is lost. That is, FIG. 2 is a sectional view showing a cut shape in which the area yield in slitting cutting is maximized in the length (Y) direction with respect to the raw cloth 10 having the entire width X and the entire length Y, (case 1), which shows that the product is cut into one line of product A and two lines of product B.

Considering the area yield as above, case 1 may be optimal when cutting into one line of product A and two lines of product B. However, if you consider the profit, the rankings may be different. Specifically, when the profit is calculated in consideration of the price (sales price) of each product, the [Table 1] may show the same result as [Table 4].

<Result of profitability calculation according to foundation type> division
Foundation type Revenue (Unit: 10,000 won) ranking case 1
A x 1 + B x 2 2163 3 case 2
A x 2 + D x 1 2265 One case 3
A x 1 + B x 1 + C x 1 2255 2 case 4
A x 2 + E x 1 2132 4 case 5
A x 1 + B x 1 + D x 1 2150 5 case 6
A x 1 + C x 2 2117 6 case 7
A x 1 + C x 1 + D x 1 2059 7 case 8
A x 1 + B x 1 + E x 1
2037
8

The ranking is different considering the profit as above. In other words, considering profit, it is best to cut 2 lines of product A and 1 line of product D (case 2). In case of showing the highest value in area yield (case 1), it can be ranked as the third place.

Fig. 7 shows the above-described cutting form. 7, W _A is the width of the A product, and W _D is the width of the D product. That is, FIG. 3 shows a case in which cutting is performed for two lines of product A and one line of product D at the time of slitting in the longitudinal direction with respect to the fabric 10 having the overall width X and the overall length Y, . Therefore, it is advisable to cut in the form of the cut shown in FIG. 7 in consideration of the profit.

The above general formula (3) can be applied to any n strips in all cases where the widths of the strips (11) (12) 13 are equal to or different from each other. In the general formula 3, P representing the price of the single article 10a can be obtained through the product price information at the time of cutting. Further, n is an arbitrary value and can be determined according to the width of the fabric 10 and the width of the strips 11, 12 (13). In addition, T indicating the number of products of the single article 10a can be predetermined. For example, in the case of a polarizing plate, since the width and the length are standardized in units of inch, when the width of the strips 11, 12, 13 is determined, T is determined according to the standard. In this case, ) 13 is equal to the size (width and / or length) of the single article 10a.

Therefore, calculating the cutting type that maximizes the M value according to the general formula (3) can maximize profitability. Specifically, the M value of the general formula (3) is calculated while varying the width of the strip and / or the number of strips. Among the calculated M values, it is possible to obtain the best profitability by cutting the width of the strips 11, 12, 13 and / or the number of the strips 11, 12, 13 that maximize the value of M .

In the second embodiment, a case has been described in which one raw fabric 10 is cut into a plurality of strips 11, 12, and 13. Generally, the fabric 10 is wound on a roll and stored in a clean room. In the clean room, a plurality of fabrics 10 having different sizes, qualities, and enhancement periods (or production dates) are stored. The present embodiment illustrates a slitting cutting method that provides the best profitability to the plurality of fabrics 10 as described above.

According to a third aspect of the present invention, there is provided a production method of a cut product of the present invention, comprising: a profit calculating step of selecting a cutting method in which the R value of the following general formula (4) A fabric selection step of selecting a fabric 10 according to the selected cutting method among a plurality of fabrics 10; Obtaining a plurality of strips (11), (12), and (13) by slitting and cutting the selected raw material (10) in the longitudinal direction; And a step of cutting the strips (11), (12) and (13) obtained in the width direction to obtain a single article (10a).

[Formula 4]

M is the number of the fabric 10 (m? 2), n is the number (n? 2) of the strips 11, 12, 13 produced in each fabric 10, T is the number of individual articles 10a produced in each of the strips 11, 12 and 13 and P is the price of the individual articles 10a produced in the respective strips 11, 12 and 13.

Specifically, a cutting method of maximizing the R value of the general formula (4) is selected. Selection of the cutting method is as described in the first embodiment and the second embodiment. In one example, based on the size of each fabric 10, a fabric 10 that maximizes the R value of the general formula 4 is selected.

For example, suppose that there are three fabrics (Fabric R1, Fabric R2 and Fabric R3) and produce Fabric A, Fabric B, Fabric C, Fabric D, and Fabric E for these fabrics. The R value is calculated for each of the fabrics R1 to R3 while varying the width of the strip and / or the number of strips. In this case, for example, in the case of maximizing the R value of the general formula (3), the fabric R1 has two strips A and B and one strip C and one strip C and four strips D , And the fabric R3 is three strips of product B and two strips of product E, one of the cloths R1 to R3 is selected in consideration of production schedule and the like. If the selected fabric is the fabric R1, cut the fabric R1 into two strips of product A and one strip of product B. You can then select Fabric 2 and cut it into one strip of C and four strips of D.

As mentioned above, since the fabric 10 is generally wound on a roll, the selection of the fabric 10 in this embodiment may mean roll selection.

In the present embodiment, a case where a quality of good quality (good quality) can be maximized in consideration of the defect (d) will be described. According to the present embodiment, in the cutting process, the fabric is cut by slitting the fabric with the number of strips calculated, and the positions of the strips are arranged according to the defect distribution to cut.

As in the second embodiment, it is assumed that the cutting type that maximizes the profitability with respect to the fabric 10 shown in Fig. 7 is to cut two lines of product A and one product D, respectively. At this time, when the defect (d) exists in the fabric (10), the distribution (position) of the defect (d) can be considered for the improvement.

Referring to FIGS. 8 to 10, the product yield may vary depending on where the two rows of product A and one row of product D are located. In the present invention, the "positive product rate" means the area yield in consideration of quality improvement.

As shown in Figs. 8 to 10, since the distribution of the defect (d) may be different for each line, the two products of the product A and the product of the product D are set to have the highest throughput rate and cut. More specifically, in the present embodiment, when the cutting mode that maximizes the profitability is determined in the second embodiment, the strips 11 and 12 are formed in consideration of the area yield (positive yield rate) (13) is arranged and cut. As a result, it is possible to achieve the best profitability as well as the highest throughput rate. This is also because a plurality of strips 11 (12) and 13 (13) calculated in the form of a cut to maximize profitability are at least two (2 lines) or more and the number of lines It may be useful when it includes two or more kinds of strips 11, 12, and 13. Figures 8 to 10 illustrate this case.

FIGS. 8 to 10 illustrate the assumption of the flatness according to the arrangement of two lines of product A and one line of product D, respectively. At this time, among FIGS. 8 to 10, the optimum cutting form can be the arrangement of FIG. In other words, when the product is cut in the order of 1 product of A product, 1 product of A product and 1 product of D product from the left, it is possible to obtain the highest profitability / good product rate.

11 and 12, a production system for a cut product includes an area yield calculating unit 210 for calculating the number of strips and the width of the strip such that the area yield is equal to or greater than a predetermined value at the time of cutting the raw fabric, And a cutting unit 300 for obtaining a plurality of strips by slitting the raw material in the longitudinal direction by the number of strips calculated by the yield calculating unit 210 and the width of the strip.

In addition, the production system of the cut product may include a product information input unit 110 for inputting a price for each product to be cut, and a profit calculation unit 120 for calculating a profit of the product, based on the price of each product input to the product information input unit 110 (220). &Lt; / RTI >

Referring to FIG. 6, the production system of the cut product may include a far-end information input unit 120.

The product information input unit 110 stores product information. At this time, the information of the product includes the size of each product. For example, when the cloth 10 is cut into n products, the sizes of the n products to be cut are input to the product information input unit 110. Here, n products (n? 2) are as described above. For example, when there are five strip products having different sizes (areas or inches) as the products to be cut, sizes of the five strip products are stored in the product information input unit 110.

The raw information of the raw fabric 10 is input to the raw information input unit 120. The fabric information input unit 120 is inputted with fabric information such as the cost of producing the fabric 10, the price of the fabric 10 and / or the date of enhancement of the fabric 10 (and / or the production date) Lt; / RTI > At this time, the production cost includes at least the manufacturing cost of the fabric 10, as mentioned above. Specifically, at least the fabrication cost of the fabric 10 may be input and stored in the fabric information input unit 120. [ In some cases, the estimated cost for cutting, which may be generated at the cutting of the fabric 10, may be input to the fabric information input unit 120. In the far-end information input unit 120, the size of the raw material 10, for example, may be input as far-end information. More specifically, at least one selected from the width X and the length Y of the fabric 10 may be input to the fabric information input unit 120. In addition, the date of manufacture and / or the date of production of the fabric 10 may be further input to the fabric information input unit 120.

The area yield calculating unit 210 calculates the area yields of the strips 11, 12 and 13 and the widths of the strips 11, 12 and 13, which maximize the area yield, . In one example, the area yield calculation unit 210 calculates the number of strips and the width of strips that maximize the area yield based on the information of the product information input unit 110 and / or the far-end information input unit 120 . The area yield calculating unit 210 may calculate the area yield ratios of the strips 11, 12, 13 and / or the strips 11, 12, 13 having the greatest area yield based on the above- 12) (13) can be calculated.

The cutting unit 300 can cut the fabric 10 in a cut shape having the maximum area yield based on the result calculated by the area yield calculating unit 210. [ For example, the cutting unit 300 may cut the number (stripes) of the strips 11, 12, 13 and / or the strips 11, 12, 13 calculated by the area yield calculating unit 210, The fabric 10 can be cut with the width of the fabric.

The cutting unit 300 includes a cutting device. 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 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 cutting unit 300 includes a first cutting unit for obtaining a plurality of strips 11, 12, and 13 by slitting the fabric 10 in the longitudinal direction. In addition, the cutting unit 300 may include a second cutting unit that cuts the plurality of strips 11, 12, 13 in the width direction to obtain a single piece.

On the other hand, the production system of the cut product may further include a defect information storage unit 400 and a good product calculation unit 500.

The defect information of the fabric 10 is stored in the defect information storage 400. The defect information may be, for example, the distribution (position) and / or the type of the defect (d) of the defect (d) present in the fabric 10. The defect information may be inspected by, for example, a defect inspection apparatus (not shown) and input to the defect information storage unit 400. [ In addition, the defect information may be displayed on an x-y coordinate through a monitor (not shown).

The good product calculating unit 500 calculates the yield rate of the flat product based on the distribution of defects (d) stored in the defect information storage unit 400, that is, the area yield according to the distribution of defects (d). This is as described in the above embodiment. The good product calculating unit 500 calculates the yield rate in consideration of such a cutting form and a distribution of defects (d) when the area yield calculating unit 200 calculates a cut shape having the largest area yield. For example, as exemplified in the above embodiment, it is assumed that the cutting form having the largest area yield is one line of product A and two lines of product B, respectively. At this time, the good product calculating unit 500 calculates the quantity of the positive product according to the arrangement order of the first product A and the second product B on the fabric 10. Specifically, as shown in FIG. 3 to FIG. 5, the yield rate according to the arrangement of each product is calculated. In the cutting unit 300, the cloth 10 can be cut with an arrangement having the highest yield rate.

The profit calculating unit 220 calculates the profit based on the information of the product information input unit 110 and / or the far-end information input unit 120. In one example, the profit calculator 220 includes at least a profit calculator for calculating and calculating a profit for each product, which can calculate the profit through Equation 2, for example. For example, when there are products A, B, and C, the price (sales price) of each product and the manufacturing cost of the fabric 10 are calculated, and the profit for each product is calculated.

In addition, the profit calculating unit 220 calculates the number (the number of lines) of the strips 11 (12 (13)) having the highest profit, the strip 11 ( 12) It is possible to calculate the number of produced pieces 10a, the widths of the strips 11, 12, 13, and / or the fabric 10,

The cutting unit 300 can cut the product (product) having the highest profit based on the result calculated by the profit calculating unit 220. Specifically, the cutting unit 300 cuts the fabric 10 to a size (product) having the highest profit among profits for each product calculated by the profit calculating unit 220. If the profit calculating unit 220 calculates the cutting form having the highest profit based on the general formula 3 or the formula 4, the cutting unit 300 can cut the cloth 10 in such a cutting form have.

In addition, the good product calculating unit 500 can calculate the yield rate considering the cutting type and the defect (d) distribution when the profit form calculating unit 220 calculates the cut form having the highest profit. For example, in the above-described third embodiment, it is assumed that the cutting type having the highest profit is 2 lines of product A and 1 product of product D, respectively. At this time, the good product calculating unit 500 calculates the quantity of the positive product according to the arrangement order of the two products A and one product D on the fabric 10. Specifically, as shown in Figs. 8 to 10, the yield rate of each product is calculated. In the cutting unit 300, the cloth 10 can be cut with an arrangement having the highest yield rate.

In another embodiment of the present invention, the fabric 10 is slit-cut to have the highest profitability and / or productivity rate as described above, and then the slit-cut strips 11, 12, (10a).

The foregoing description of the preferred embodiments of the present invention has been presented for purposes of illustration and various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention, And additions should be considered as falling within the scope of the following claims.

10: Fabric
11, 12, 13: strip

Claims

delete

An area yield calculating step of calculating an area yield of the raw fabric that changes according to the cutting method of the fabric;
A profit calculating step of calculating a profit of the product which changes according to the cutting method of the fabric; And
And a cutting step of cutting the fabric in a cutting method based on at least one of the calculated area yield and the calculated profit of the product.

The method according to claim 6,
The cutting step may be such that the yield of the product calculated by the first cutting method is larger than the yield of the product calculated by the second cutting method even if the area yield calculated by the first cutting method is lower than the area yield by the second cutting method Wherein the first cutting method is performed by cutting the fabric by a first cutting method.

The method according to claim 6,
The stage of the foundation is performed by cutting the fabric with a cutting method that represents the maximum value of the product calculated in the profit calculation stage.

9. The method of claim 8,
Wherein the product to be cut is a single piece obtained by cutting the raw fabric in the longitudinal direction and the width direction respectively, or a strip-shaped strip obtained by cutting the raw fabric in the longitudinal direction.

The method according to claim 6,
Wherein the profit of the product is calculated by the following formula 2:
[Formula 2]

Where n is the number of products to be cut and P is the price of each cut product.

The method according to claim 6,
The profit calculation step is performed based on the following general formula (3)
The cutting step includes a step of slitting the fabric in a lengthwise direction in accordance with a cutting method in which the value of M is the maximum, obtaining a plurality of strips, and cutting the cut plurality of strips in the width direction to obtain a single product Production method of foundation products:
[Formula 3]

Where n is the number of strips, T is the number of individual articles produced in each strip, and P is the price of the individual articles produced in each strip.

12. The method of claim 11,
Wherein the M value is calculated by varying the width of the strip and / or the number of strips.

12. The method of claim 11,
Wherein the width of the strip is set equal to the width or length of the single piece.

12. The method of claim 11,
Wherein the step of obtaining a plurality of strips further comprises the step of arranging the positions of the respective strips according to the defect distribution of the fabric.

The method according to claim 6,
The profit calculation step is performed based on the following general formula (4)
The cutting step includes a fabric selecting step of selecting a fabric according to a cutting method in which the value of R is the maximum value; Obtaining a plurality of strips by slitting the selected fabric in the longitudinal direction; And a step of cutting each of the obtained strips in the width direction to obtain a single product.
[Formula 4]

16. The method of claim 15,
The R value is calculated by varying the width of the strip and / or the number of strips.

16. The method of claim 15,
Wherein the width of the strip is set equal to the width or length of the single piece.

The method according to claim 6,
Wherein the area yield calculation step is performed by calculating the number of strips and the width of the strip such that the area yield is equal to or greater than a predetermined value.

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