JP2014226833A - Blank manufacturing system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blank manufacturing system capable of more surely detecting defective products.SOLUTION: The blank manufacturing system is configured to manufacture a blank for a container from a slender web having a defect indication mark attached to the side edge. The blank manufacturing system comprises: a first mark detection portion for detecting the defect indication mark attached to the web; a cutting portion that cutts the web to obtain the blank; and a second mark detection portion for detecting the defect indication mark attached to the blank.

Description

  The present invention relates to a system and method for manufacturing a blank for a container from an elongated web having a defect indicating mark on a side edge.

  As a container for containing a product made of a liquid such as milk or a solid such as confectionery, a container produced by folding a blank is known. The blank surface is generally printed with information about the product contained in the container. A method for manufacturing such a blank is disclosed in Patent Document 1, for example. In the blank manufacturing method described in Patent Document 1, first, predetermined product information is printed on an elongated plain web. Next, the printed web is cut using a sheet cutter, thereby obtaining a blank having a predetermined length.

  By the way, in the blank manufacturing process, various problems such as defective printing and adhesion of foreign matter may occur. As a method of eliminating defective products that have such problems, first, the surface of the printed web is inspected, and a defect display label is pasted on the defect location on the web, and then the defect that is stuck on the web. A method is known in which a display label is detected, and then a printed web is cut to generate a blank, and then a blank corresponding to a defect display label is eliminated. According to this method, since the location of the defect is clearly indicated by the defect display label, it is possible to prevent the defective blank from being shipped with a high probability. Moreover, since the inspection process for inspecting the surface of the web and the exclusion process for eliminating the defective portion are separate processes, the inspection process and the exclusion process can be carried out at different speeds on separate lines.

JP 2012-246118 A

  When the defect display label affixed to the web is detected and the corresponding blank is eliminated based on this information, the defect display label affixed to the web may not be detected depending on the positional relationship between the web and the defect display label. is there. In this case, a defective product such as a blank with the defect display label attached may be shipped.

  An object of this invention is to provide the blank manufacturing system and blank manufacturing method which can solve such a subject effectively.

  The present invention is a system for manufacturing a blank for a container from an elongated web having a defect display mark attached to a side edge, and a first mark detection unit that detects the defect display mark attached to the web; A blank manufacturing system comprising: a cutting unit that cuts the web to obtain the blank; and a second mark detection unit that detects the defect display mark attached to the blank.

  The blank manufacturing system by this invention WHEREIN: The said defect display mark may consist of the defect display label affixed on the said web. In this case, the first mark detection unit is configured to detect the defect display mark based on the fact that the defect display label protrudes from a side edge of the web, and the second mark detection unit The defect display mark may be detected based on a difference in reflectance between the surface of the blank and the surface of the defect display label.

  In the blank manufacturing system according to the present invention, the web includes a plurality of first blanks arranged in the longitudinal direction of the web, and a plurality of the blanks arranged in the longitudinal direction of the web at positions different from the first blank. The second blank may be assigned at least. In this case, the defect display mark is a first defect display mark indicating that a defect exists in a portion corresponding to the first blank in the web, and a portion corresponding to the second blank in the web. A second defect display mark indicating that a defect is present, and the color or shape of the first defect display mark may be different from the color or shape of the second defect display mark.

  The blank manufacturing system according to the present invention may further include an exclusion unit that excludes the blank to which the defect display mark is attached based on information from the first mark detection unit. In this case, based on the information as to whether the defect display mark is the first defect display mark or the second defect display mark, the exclusion unit determines which of the first blank or the second blank. It may be configured so that it can be selectively excluded.

  The blank manufacturing system according to the present invention is provided on the upstream side of the first mark detection unit, and inspects the surface of the web to detect defects, and between the inspection unit and the first mark detection unit. And a defect display unit that attaches a defect display mark to a defect portion of the web detected by the inspection unit. The blank manufacturing system according to the present invention may further include a printing unit that is provided upstream of the inspection unit and prints predetermined product information on the web.

  The present invention is a method of manufacturing a blank for a container from an elongated web having a defect display mark attached to a side edge, the first mark detecting step for detecting the defect display mark attached to the web; A blank manufacturing method comprising: a processing step of cutting the web to obtain the blank; and a second mark detection step of detecting the defect display mark attached to the blank.

  According to the present invention, a blank manufacturing system detects a defect display mark attached to a blank obtained by cutting a web, and a first mark detection unit that detects a defect display mark attached to the web. A two-mark detection unit. Therefore, even if the defect display mark cannot be detected by the first mark detection unit because the positional relationship between the web and the defect display mark is inappropriate, the second defect display mark attached to the blank is not displayed. It can be detected by a mark detection unit. For this reason, it can prevent that the blank which a defect exists, or the blank with a defect display mark attached is shipped.

FIG. 1 is a diagram showing a blank manufacturing system according to an embodiment of the present invention. FIG. 2 is a plan view showing a web to which a plurality of blanks are assigned. FIG. 3 is a diagram showing a printing system for printing product information on a raw material web. FIG. 4 is a diagram illustrating an example of a method of observing a defect display mark attached to a web using the first mark detection unit. FIG. 5A is a diagram illustrating an example of a method of observing a defect display mark attached to a blank using a second mark detection unit. FIG. 5B is a diagram illustrating an example in which a part of the blank is excluded by the exclusion unit before observation using the second mark detection unit. FIGS. 5C (a) and 5 (b) are diagrams showing an example of a method for removing a blank with a defect display mark by an exclusion unit. FIG. 6 is a diagram showing a blank manufacturing system according to a first modification of the embodiment of the present invention. FIG. 7 is a diagram showing a blank manufacturing system according to a second modification of the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5B. Here, an example will be described in which product information is printed in advance, and an elongated web having defect display marks attached to the side edges is supplied to a blank manufacturing system for manufacturing a container blank. First, the web supplied to the blank manufacturing system will be described with reference to FIG.

(web)
FIG. 2 is a plan view showing the web 13. The web 13 extends in an elongated shape, and in FIG. 2, a pair of side edges thereof are indicated by reference numerals 13 a and 13 b, respectively.

  The blank manufacturing system 10 to be described later is configured to obtain a large number of product blanks from the web 13 by cutting the web 13 into a predetermined shape. Therefore, it can be said that many product blanks are assigned to the web 13. In FIG. 2, a plurality of product blanks 15 allocated to the web 13 are virtually shown by a one-dot chain line. Here, the “product blank” means a blank that becomes a container such as a milk pack by being boxed.

  In this embodiment, an example in which the blank manufacturing system 10 manufactures the product blank 15 will be described. However, as long as the blank manufacturing system 10 cuts the web 13 into a predetermined shape, a blank obtained by the blank manufacturing system 10 is used. Is not limited to the product blank 15. For example, as virtually indicated by a two-dot chain line in FIG. 2, the blank manufacturing system 10 cuts the web 13 to obtain a certain number of, for example, four sheet blanks 14 to which four product blanks 15 are assigned. Also good. In the present invention, the “blank” is a concept including both the product blank 15 and the single-wafer blank 14.

  As shown in FIG. 2, a large number of product blanks 15 allocated to the web 13 include a plurality of first blanks (first blanks) 15 a arranged in the longitudinal direction of the web 13 along the first side edge 13 a. A plurality of second blanks (second blanks) 15b arranged in the longitudinal direction of the web 13 at positions different from the first blank 15a, for example, along the second side edge 13b are included. That is, a plurality of product blanks 15 are allocated in the width direction orthogonal to the longitudinal direction of the web 13. For this reason, more product blanks 15 can be obtained from the web 13 of a fixed length, and thereby the production efficiency of the product blanks 15 can be increased.

  As shown in FIG. 2, the web 13 may be provided with cutter marks 21 serving as a guide when cutting the web 13 at equal intervals along the longitudinal direction of the web 13. For example, one cutter mark 21 is provided for one sheet-like blank 14.

  The material constituting the web 13 is not limited, and various materials can be used depending on the characteristics required for the container obtained from the product blank 15. For example, a paper web or a laminate web including a paper layer may be used as the web 13, or a plastic web may be used.

(Defect indication mark)
Next, the defect display mark 20 attached to the side edge of the web 13 will be described. In FIG. 2, the defect display mark 20 is attached to the first side edge 13a of the web 13. However, the present invention is not limited to this, and the defect display mark 20 is attached to the second side edge 13b of the web 13. It may be.

  The defect display mark 20 means that a defect is present on the surface of the web 13 at or near the location where the defect display mark 20 is attached. As the defect, for example, defective printing of product information or a foreign matter adhering to the surface of the web 13 can be considered.

  The specific configuration of the defect display mark 20 is not particularly limited as long as the location where the defect exists can be clearly indicated. For example, as the defect display mark 20, a scratch formed by a label, a file, or the like, or a print provided by an inkjet printing method or the like can be employed. Here, an example in which the defect display mark 20 includes a defect display label attached to the web 13 will be described. In addition, when a defect display label is used as the defect display mark 20, as shown in FIG. 2, the defect display label may be stuck on the web 13 so as to protrude from the first side edge 13a.

  Moreover, the defect display mark 20 which has a different color according to the location where a defect exists may be used. For example, as shown in FIG. 2, the defect display mark 20 includes a red first defect display mark 20 a indicating that a defect exists in a location corresponding to the first blank 15 a of the web 13, and a second of the web 13. And a blue second defect display mark 20b indicating that a defect exists at a location corresponding to the blank 15b. Note that the difference between the first defect display mark 20a and the second defect display mark 20b is not limited to the color. For example, as the first defect display mark 20a and the second defect display mark 20b, different shapes, for example, square and star marks may be used.

(Blank manufacturing system)
Next, with reference to FIG. 1, the blank manufacturing system 10 which cuts out the several product blank 15 from the above-mentioned web 13 is demonstrated. The blank manufacturing system 10 includes a sheet feeding unit 11 that unwinds the web 13 from the wound body 12 of the web 13 with the defect display mark 20, and a supply line 17 that conveys the web 13 unwound from the sheet feeding unit 11. The first mark detection unit 22 and the cutting unit 24 are provided in order from the upstream side along the supply line 17. In FIG. 1, the direction in which the web 13 is conveyed is indicated by an arrow F.

  The first mark detection unit 22 detects the defect display mark 20 attached to the web 13. As long as the defect display mark 20 can be detected, the specific configuration of the first mark detection unit 22 is not particularly limited. For example, the first mark detection unit 22 includes a camera that acquires the first side edge 13a of the web 13 and the surrounding image as a still image or a moving image, and an analysis device that analyzes the image to determine the presence or absence of the defect display mark 20. , Including.

  The cutting part 24 cuts the web 13 to obtain the product blank 15. As long as the product blank 15 having a desired shape can be obtained, the specific configuration is not particularly limited. For example, examples of the cutting unit 24 include a rotary die cutter (RDC) and a platen. More specifically, the cutting part 24 may include a roller to which a punching blade 24a configured to punch out the web 13 with a desired contour is attached. Note that the cutting unit 24 may be configured to obtain the sheet blank 14 to which a certain number of product blanks 15 are assigned instead of the product blank 15. In this case, as the punching blade 24 a of the cutting portion 24, a blade extending in the width direction of the web 13 can be used.

  Moreover, as shown in FIG. 1, the blank manufacturing system 10 is provided along the blank conveyance part 26 which conveys the product blank 15 obtained by the cutting | disconnection using the cutting part 24, and the blank conveyance part 26, and the product blank 15 is provided. And a second mark detector 28 for detecting the defect display mark 20 attached to the. The defect display mark 20 attached to the product blank 15 is a defect display mark 20 remaining on the product blank 15 after the web 13 is cut and the product blank 15 is obtained.

  The second mark detection unit 28 detects the defect display mark 20 attached to the product blank 15. As long as the defect display mark 20 can be detected, the specific configuration of the second mark detection unit 28 is not particularly limited. For example, similarly to the first mark detection unit 22, the second mark detection unit 28 acquires the side edge 15c of the product blank 15 obtained on the first side edge 13a side of the web 13 and the surrounding image as a still image or a moving image. And an analysis device that analyzes the image to determine the presence or absence of the defect display mark 20. The side edge 15c of the product blank 15 is a side edge along the first side edge 13a of the web 13 to which the defect display mark 20 is attached.

  The blank manufacturing system 10 further includes a blank discharge unit 30 that receives the product blank 15 that has passed through the second mark detection unit 28, and a blank stacking unit 32 that stacks the product blank 15 discharged from the blank discharge unit 30. It may be.

  Next, the operation and effect of the present embodiment having such a configuration will be described. Here, a printing method for manufacturing the elongated web 13 with the defect display mark 20 attached to the first side edge 13a using the printing system 40 will be described first with reference to FIG. Next, the blank manufacturing method which manufactures the product blank 15 from the web 13 using the above-mentioned blank manufacturing system 10 is demonstrated.

(Printing method)
As shown in FIG. 3, the printing system 40 is provided in order from the upstream side along the supply line 41 that feeds a web 42 (hereinafter also referred to as a raw material web) 42 on which product information or the like is not printed. A printing unit 44, an inspection unit 46, and a defect display unit 48.

  First, the printing system 40 uses the printing unit 44 to print predetermined product information on the raw material web 42. As a result, a printed web 13 is obtained. A specific method of printing is not particularly limited, and a known method such as gravure printing or offset printing is appropriately employed.

  Next, an inspection unit 46 provided on the downstream side of the printing unit 44 inspects the surface of the web 13 and detects a defect. When a defect is detected, information regarding the timing at which the defect is detected is sent from the inspection unit 46 to the defect display unit 48. At this time, the inspection unit 46 may send not only information regarding the timing at which the defect is detected but also information regarding the position of the defect to the defect display unit 48. For example, whether a defect is detected at a location on the first side edge 13a side of the web 13 (location corresponding to the first blank 15a) or a location on the second side edge 13b side of the web 13 (corresponding to the second blank 15b). Information on whether or not it was detected at the location).

  Thereafter, the defect display unit 48 provided on the downstream side of the inspection unit 46 attaches the defect display mark 20 to the defect portion of the web 13 detected by the inspection unit 46. For example, the defect display unit 48 attaches the defect display mark 20 to the defective portion in consideration of the conveyance speed of the supply line 41 and the distance between the inspection unit 46 and the defect display unit 48. The web 13 on which the predetermined product information is printed and the defect display mark 20 is attached is wound up to become the wound body 12. The obtained wound body 12 is transferred to the blank manufacturing system 10 described above.

  In addition, when the information regarding the position of a defect is sent to the defect display part 48 from the test | inspection part 46, the defect display part 48 may use properly the color and shape of the defect display mark 20 according to the position of a defect. For example, when a defect is detected at a location corresponding to the first blank 15a, the defect display unit 48 uses the red first defect display mark 20a and a defect is detected at a location corresponding to the second blank 15b. Alternatively, the blue second defect display mark 20b may be used.

By the way, the positional relationship between the web 13 and the defect display mark 20 in the width direction of the web 13 is not always constant. For example, when the defect display mark 20 is composed of a defect display label, as is apparent from a comparison between the defect display label denoted by reference numeral (1) and the defect display label denoted by reference numeral (3) in FIG. There may be individual differences in the protrusion length a1 where the label protrudes from the first side edge 13a of the web 13, the length a2 of the defect display label located on the web 13, and the like. Such an individual difference may be caused by a positional deviation of the web 13 in the width direction, an individual difference in the length of the defect display label, or the like. It is also conceivable that the portion of the defect display label that protrudes from the first side edge 13a of the web 13 is bent or torn while the roll 12 of the web 13 is transferred. In such a case, the operation | work which detects the defect display mark 20 which consists of a defect display label will become difficult.
Moreover, the defect display mark 20 may be attached so that it may straddle the boundary between the two 1st blanks 15a like the defect display mark 20 attached | subjected the code | symbol (2) in FIG. Here, when most of the defect display marks 20 are present in one of the two first blanks 15a, only one of the first blanks 15a is determined to be defective, and the other first blank 15a is a non-defective product. May be determined. However, as long as the defect display mark 20 is partially present in the other first blank 15a, the other first blank 15a should also be excluded as a defective product.
Here, according to the blank manufacturing system 10 described above, these problems can be solved, and only the product blank 15 without the defect display mark 20 can be easily shipped. Hereinafter, with reference to FIG. 4 and FIG. 5A, the process of manufacturing the product blank 15 from the web 13 using the blank manufacturing system 10 is demonstrated.

(Blank manufacturing method)
First, referring to FIG. 4, a first detection step of detecting the defect display mark 20 attached to the web 13 using the first mark detection unit 22 is performed. Here, a method of detecting the defect display mark 20 using the two cameras (the first camera 22a and the second camera 22b) of the first mark detection unit 22 will be described.

  The first camera 22a and the second camera 22b are arranged along the longitudinal direction of the web 13 with an interval corresponding to the length of one product blank 15 (dimension in the longitudinal direction of the web 13). Further, each of the first camera 22a and the second camera 22b is configured to be able to photograph the first side edge 13a of the web 13 and its peripheral region over the entire length of at least one product blank 15. . Therefore, by using the first camera 22a and the second camera 22b, a defect is displayed in one image over the entire length of the plurality of sheet blanks 14 to which four product blanks 15 are assigned. The mark 20 can be detected.

Hereinafter, an example of a method for detecting the defect display mark 20 attached to the web 13 using the first mark detection unit 22 will be described. In this example, the first mark detection unit 22 is configured to detect the defect display mark 20 based on the fact that the defect display mark 20 including the defect display label protrudes from the first side edge 13a of the web 13. Will be described.
First, the 1st mark detection part 22 image | photographs the area | region of the 1st side edge 13a of the web 13, and its periphery using the above-mentioned 1st camera 22a and 2nd camera 22b. Next, the first mark detection unit 22 analyzes the obtained image and determines the presence or absence of an object that protrudes laterally from the first side edge 13 a of the web 13. In general, the side edge of the web 13 extends linearly. For this reason, the presence of an object projecting laterally from the first side edge 13a of the web 13 means that a defect display mark (defect display label) 20 is affixed to the location. Yes. Therefore, the defect display mark 20 can be easily detected by determining the presence or absence of a protruding object.

  Next, the cutting unit 24 performs a processing step of cutting the web 13 into a predetermined shape to obtain the product blank 15. The cutting unit 24 may perform alignment of the web 13 at the time of cutting, using the cutter mark 21 as a guide. Thereafter, the product blank 15 is sent to the blank transport unit 26. FIG. 5A shows a state in which the first blank 15a and the second blank 15b of the product blank 15 on the blank transport unit 26 are arranged with a predetermined gap for convenience. May be arranged on the blank conveyance section 26 without a gap.

  Then, as shown in FIG. 1, the 2nd detection process of detecting the defect display mark 20 attached | subjected to the product blank 15 using the 2nd mark detection part 28 is implemented. For example, as shown in FIG. 5A, as in the case of the first detection process using the first mark detection unit 22 described above, two cameras (a first camera 28a and a second camera 28b) of the second mark detection unit 28 are used. ) To detect the defect display mark 20. Since the arrangement method and photographing range of the two cameras 28a and 28b are the same as those of the cameras 22a and 22b of the first mark detection unit 22, detailed description thereof is omitted.

Hereinafter, an example of a method for detecting the defect display mark 20 attached to the product blank 15 using the second mark detection unit 28 will be described. Here, the second mark detection unit 28 is configured to detect the defect display mark 20 based on the difference in reflectance between the surface of the product blank 15 and the surface of the defect display mark 20 formed of the defect display label. An example will be described.
First, the second mark detection unit 28 photographs the side edge 15c of the first blank 15a and the surrounding area using the first camera 28a and the second camera 28b described above. Next, the second mark detection unit 28 analyzes the density distribution of the obtained image and determines the presence or absence of the defect display mark 20. In general, the side edge 15c of the first blank 15a is assigned a portion that becomes an upper end portion or a lower end portion of the container when the box is made into a container. The upper end or the lower end of the container is a portion formed by bonding the inner surfaces of the first blanks 15a. These portions are usually not printed with images or the like, and even if they are printed, there are only a few prints representing the expiration date. That is, the portion of the first blank 15a to which the defect display mark 20 is attached and the surrounding portion are mostly plain and white portions. For this reason, it is expected that the contrast between the portion where the defect display mark 20 exists and the surrounding portion is increased. Therefore, the defect display mark 20 can be easily detected by analyzing the density distribution of the obtained image and determining whether or not there is a portion with a large density difference.

  Then, based on the information from the 1st mark detection part 22 and the 2nd mark detection part 28, the exclusion process which excludes the product blank 15 with which the defect display mark 20 is attached is implemented. For example, the blank manufacturing system 10 uses the blank conveyance unit 26 or a blank on the downstream side of the product blank 15 with the defect display mark 20 based on information from the first mark detection unit 22 and the second mark detection unit 28. You may provide the exclusion part excluded automatically from the discharge part 30. FIG.

  Note that, as indicated by reference numeral 34 in FIG. 1, the exclusion unit that excludes the product blank 15 to which the defect display mark 20 is attached is provided between the first mark detection unit 22 and the second mark detection unit 28. May be. In the example shown in FIG. 1, the exclusion unit 34 is configured to exclude the product blank 15 to which the defect display mark 20 is attached based on information from the first mark detection unit 22. For example, the exclusion unit 34 transports the product blank 15 without the defect display mark 20 along the normal transport direction F (see FIG. 5C (a)), but does not have the defect display mark 20 attached. A movable transport unit 34a that discharges the blank 15 in a discharge direction F ′ that is obliquely shifted downward from the transport direction F is included. Further, in FIG. 5B, a portion where the product blank 15 excluded by the exclusion unit 34 exists in the blank transport unit 26 is indicated by a dotted line. According to the example shown in FIG. 5B, most of the product blank 15 with the defect display mark 20 can be excluded on the upstream side of the second mark detection unit 28. In this case, a product blank with a defect display mark 20 that could not be detected by the first mark detection unit 22, such as a product blank 15 with a second defect display mark 20 b with a reference sign (4) remaining. Only 15 reaches the second mark detection unit 28. Therefore, the load on the second mark detection unit 28 can be reduced as compared with the case where such an exclusion unit 34 is not provided.

  In the example shown in FIG. 5B, the exclusion unit 34 determines whether the defect display mark 20 is the first defect display mark 20a or the second defect display mark 20b. Any of 15b may be selectively excluded. For example, when the defect display mark 20 is the first defect display mark 20a, it is the first blank 15a that has a defect. In this case, the exclusion part 34 should just exclude only the 1st blank 15a among the adjacent 1st blanks 15a and 2nd blanks 15b. On the other hand, when the defect display mark 20 is the first defect display mark 20a, the defect exists in the second blank 15b, but the first blank 15a adjacent to the second blank 15b has a first defect display mark. 20a is attached. Therefore, in order to prevent the first blank 15a with the first defect display mark 20a being attached from being shipped, as shown in FIG. 5B, the exclusion unit 34 is not only the second blank 15b where the defect exists, The adjacent first blank 15a is also excluded.

  The product blank 15 that has passed through the second mark detection unit 28 is transferred from the blank transport unit 26 to the blank discharge unit 30, and then sent into the blank stacking unit 32 by the blank discharge unit 30. Accumulated. In addition, when the blank manufacturing system 10 is configured to obtain a sheet-like blank 14 to which a certain number of product blanks 15 are assigned as described above, the sheet-like blank 14 accumulated in the blank accumulating unit 32 is a sheet-like shape. It may be sent to a subsequent process for punching the blank 14 to obtain the product blank 15.

  According to the present embodiment, the blank manufacturing system 10 is attached to the first mark detection unit 22 that detects the defect display mark 20 attached to the web 13 and the blank obtained by cutting the web 13. And a second mark detection unit 28 for detecting the defect display mark 20. Therefore, even if the first mark detection unit 22 cannot detect the defect display mark 20 because the positional relationship between the web 13 and the defect display mark 20 is inappropriate, the defect display attached to the blank is displayed. The mark 20 can be detected by the second mark detection unit 28. For example, the protrusion length a1 of the defect display label is insufficient due to misalignment of the web 13, bending or tearing of the defect display label, and the first mark detection unit 22 cannot detect the defect display label. Also, the blank on which the defect display mark 20 is attached can be detected by the second mark detection unit 28 based on the contrast between the defect display label and its peripheral portion, that is, the difference in reflectance. For this reason, it can prevent that the blank in which a defect exists, or the blank with a defect display label affixed is shipped.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

(First modification)
In the above-described embodiment, the example in which the inspection unit 46 and the defect display unit 48 are provided in the printing system 40 that is separate from the blank manufacturing system 10 has been described. However, the present invention is not limited to this, and as shown in FIG. 6, the blank manufacturing system 10 is provided on the upstream side of the first mark detection unit 22 and inspects the surface of the web 13 to detect defects. 46 and a defect display unit 48 that is provided between the inspection unit 46 and the first mark detection unit 22 and attaches the defect display mark 20 to a defect portion of the web 13 detected by the inspection unit 46. Also good. That is, the inspection process by the inspection unit 46 and the defect display process by the defect display unit 48 are performed in-line with the first detection process by the first mark detection unit 22 and the second detection process by the second mark detection unit 28. Also good. Although not illustrated, the above-described exclusion unit 34 may also be provided in the blank manufacturing system 10 according to the present modification.

(Second modification)
Alternatively, as shown in FIG. 7, the blank manufacturing system 10 is provided on the upstream side of the inspection unit 46 in addition to the inspection unit 46 and the defect display unit 48 described above, and predetermined product information is provided on the web (raw material web 42). You may further provide the printing part 44 to print. That is, the printing process by the printing unit 44 may be performed in-line with the first detection process by the first mark detection unit 22 and the second detection process by the second mark detection unit 28. Although not illustrated, the above-described exclusion unit 34 may also be provided in the blank manufacturing system 10 according to the present modification.

(Other variations)
In the above-described embodiment, the example in which the color and shape of the defect display mark 20 are selectively used according to the position of the defect is shown. However, the present invention is not limited to this, and the color and shape of the defect display mark 20 may be properly used based on other viewpoints. For example, when the presence or absence of a defect is inspected for both the front surface and the back surface of the web 13, the color and shape of the defect display mark 20 are selectively used depending on whether the defect exists on the front surface or the back surface of the web 13. May be.

  Further, in the above-described embodiment, when the second mark detection unit 28 detects the defect display mark 20, the information is sent to the exclusion unit, and the product blank 15 with the defect display mark 20 is excluded by the exclusion unit. An example to be shown. However, the method for eliminating the product blank 15 with the defect display mark 20 is not particularly limited. For example, when it is predicted that the probability that the product blank 15 with the defect display mark 20 will reach the second mark detection unit 28 is low, the blank manufacturing system 10 uses the product blank 15 with the defect display mark 20 attached. The operation of the entire blank manufacturing system 10 may be stopped every time it is detected by the second mark detection unit 28. In this case, the operator may confirm and eliminate the product blank 15 with the defect display mark 20 attached thereto.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

DESCRIPTION OF SYMBOLS 10 Blank manufacturing system 12 Winding body 13 Web 13a 1st side edge 13b 2nd side edge 14 Sheet-fed blank 15 Product blank 15a 1st blank 15b 2nd blank 20 Defect display mark 20a 1st defect display mark 20b 2nd defect display mark DESCRIPTION OF SYMBOLS 22 1st mark detection part 24 Cutting part 28 2nd mark detection part 30 Blank discharge part 32 Blank stacking part 34 Exclusion part 40 Printing system 42 Raw material web 44 Printing part 46 Inspection part 48 Defect display part

Claims (8)

A system for producing a blank for a container from an elongated web having a defect indication mark on a side edge,
A first mark detection unit that detects the defect display mark attached to the web;
A cutting part for cutting the web to obtain the blank;
A blank manufacturing system, comprising: a second mark detection unit that detects the defect display mark attached to the blank.   The blank manufacturing system according to claim 1, wherein the defect display mark includes a defect display label affixed to the web. The first mark detection unit is configured to detect the defect display mark based on the defect display label protruding from a side edge of the web.
The said 2nd mark detection part is comprised so that the said defect display mark may be detected based on the difference in the reflectance between the surface of the said blank, and the surface of the said defect display label. Blank manufacturing system. The web includes a plurality of first blanks arranged in the longitudinal direction of the web and a plurality of second blanks arranged in the longitudinal direction of the web at positions different from the first blank. Assigned at least,
The defect display mark has a defect at a position corresponding to the second blank in the web, and a first defect display mark indicating that a defect exists at a position corresponding to the first blank in the web. A second defect indicating mark indicating the presence,
The blank manufacturing system according to any one of claims 1 to 3, wherein a color or a shape of the first defect display mark is different from a color or a shape of the second defect display mark. Based on the information from the first mark detection unit, further comprising an exclusion unit that eliminates the blank to which the defect display mark is attached,
The exclusion unit selects either the first blank or the second blank based on information indicating whether the defect display mark is the first defect display mark or the second defect display mark. The blank manufacturing system according to claim 4, wherein the blank manufacturing system is configured to be able to be eliminated. An inspection unit that is provided upstream of the first mark detection unit and inspects the surface of the web to detect defects;
6. A defect display unit provided between the inspection unit and the first mark detection unit, and further including a defect display unit for attaching a defect display mark to a defect portion of the web detected by the inspection unit. The blank manufacturing system as described in any one of.   The blank manufacturing system according to claim 6, further comprising a printing unit that is provided upstream of the inspection unit and prints predetermined product information on the web. A method for manufacturing a blank for a container from an elongated web having a defect indication mark on a side edge,
A first mark detection step of detecting the defect display mark attached to the web;
A processing step of cutting the web to obtain the blank;
And a second mark detection step of detecting the defect display mark attached to the blank.

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