Packaging box manufacturing method and packaging box

Abstract

To provide a manufacturing method for a packaging box having a pair of cut lines extending from a side portion to a lid portion and a crease connecting the ends of the pair of cut lines, which enables a spacing between the pair of cut lines to be easily changed.SOLUTION: There is provided a method for manufacturing a packaging box made of a corrugated cardboard sheet, comprising: a horizontal crease forming step of feeding a long sheet in a longitudinal direction thereof and forming a main crease and two sub creases located on both sides of the main crease over an entire length of the sheet in the longitudinal direction; a unit cutting step of cutting the sheet in a direction perpendicular to the longitudinal direction thereof to form one piece of unit sheet for the packaging box; and a cut forming step of feeding the unit sheet in a direction perpendicular to the main crease and forming a pair of cut lines in the unit sheet, the cut lines intersecting the main crease and extending from one of the sub creases to the other of the sub creases.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a packaging box for packaging various products and to such a packaging box.

Background Art

[0002] In a packaging box formed of a cardboard sheet, there is generally one having a shape called 0201 type (A type). This is a rectangular parallelepiped shape, having side walls and flaps connected to the side walls, and the flaps are folded to form lids and bottoms. In such a packaging box, for example, when a rectangular parallelepiped product is accommodated without gaps, fingers may not be able to enter between the product and the side walls, and it may be difficult to take out the product.

[0003] Therefore, as shown in Patent Document 1, there has been proposed one having a pair of cut portions straddling from the side wall to the flap that becomes the lid, and a connecting portion that is ruled so as to connect the ends of the pair of cut portions. In this box, when taking out the accommodated product, with the flap opened and overlapped with the side wall, the portion between the pair of cut portions is bent by the connecting portion and pulled downward to the outside. Then, the portion becomes a space without the side wall, and fingers can be placed on the product from there, so that the product can be easily taken out.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, the above-described packaging box of the 0201 type has conventionally been manufactured by two devices called a corrugator and a flexo folder gluers. The corrugator overlaps the base paper of cardboard to form a long sheet, and feeds the sheet in the longitudinal direction. Then, horizontal ruled lines (horizontal ruled lines when made into a box, for example, folding lines for folding flaps) are formed over the entire longitudinal length of the sheet, and the sheet is cut to form a unit sheet corresponding to one box. The flexo folder gluers feeds the unit sheet in a direction orthogonal to the horizontal ruled lines. Then, the unit sheet is printed, vertical ruled lines (vertical ruled lines when made into a box, for example, folding lines between adjacent side faces), other partial ruled lines and cuts are formed, glued, and folded into a box.

[0006] The cut portions and connecting portions in the box of Patent Document 1 are formed in the flexo folder gluers. More specifically, a die for forming a pair of cut portions and a die for forming a connecting portion are pressed against the conveyed unit sheet.

[0007] Here, there may be a case where it is desired to change the interval between a pair of cut portions according to the product to be accommodated. At this time, for the cut portions, since only the position (the interval between them) changes, the position of the die may be changed. On the other hand, for the connecting portion, since its shape (length) itself changes, the die itself must be changed. Therefore, in the box of Patent Document 1, in order to change the width of a pair of cut portions, it is necessary to change the die of the connecting portion, so the cost becomes high and it is not easily adaptable.

[0008] The present invention has been made in view of such circumstances, and for a packaging box having a pair of cut lines extending from a side surface portion to a lid portion and a ruled line connecting the ends of the pair of cut lines, an object is to provide a manufacturing method in which the interval between the pair of cut lines can be easily changed, and the packaging box.

Means for Solving the Problems

[0009] The manufacturing method of the packaging box of the present invention is a method for manufacturing a packaging box made of a cardboard sheet, comprising: feeding the long sheet in its longitudinal direction, and forming horizontal ruled lines including a main ruled line and two sub-ruled lines located on both sides of the main ruled line over the entire longitudinal length of the sheet; a unit cutting step of cutting the sheet in a direction perpendicular to its longitudinal direction to form a unit sheet for one such packaging box; and a cut forming step of feeding the unit sheet in a direction perpendicular to the main ruled line and forming a pair of cut lines that intersect the main ruled line and extend from one sub-ruled line to the other sub-ruled line on the unit sheet. In the horizontal ruled line forming step, other ruled lines may be formed in addition to the main ruled line and the two sub-ruled lines. In the cut forming step, a plurality of sets of the pair of cut lines may be formed. In the cut forming step, other cuts may be formed in addition to the pair of cut lines.

[0010] Further, in the manufacturing method of the packaging box of the present invention, the horizontal ruled line forming step and the unit cutting step may be carried out in a corrugator, and the cut forming step may be carried out in a flexo folder gluer.

[0011] The packaging box of the present invention is made of a cardboard sheet, and has a side surface portion, a lid portion connected to the side surface portion via a main ruled line, a side surface sub-ruled line parallel to the main ruled line and formed over the entire length of the side surface portion, a lid sub-ruled line parallel to the main ruled line and formed over the entire length of the lid portion, and a pair of cut lines that intersect the main ruled line and extend from the side surface sub-ruled line to the lid sub-ruled line.

Effects of the Invention

[0012] According to the method for manufacturing a packaging box of the present invention, in the cut formation step, by changing the position of the formation of the cut line in the direction orthogonal to the feeding direction of the unit sheet, the positions and intervals of the pair of cut lines can be freely set. At this time, the sub-ruled lines are formed over the entire length of the unit sheet, and since a part of these sub-ruled lines becomes the folding line of the portion between the pair of cut lines, regardless of the positions and intervals of the pair of cut lines, there is no need to separately form the ruled lines that become the folding lines. And according to the packaging box manufactured in this way, when taking out the stored product, with the lid opened and overlapped with the side surface portion, by folding the portion between the pair of cut lines and pulling it downwards, this portion becomes a space where the side surface portion does not exist, and since fingers can be placed on the product from there, the product can be easily taken out. Also, since the sub-ruled lines are formed over the entire length of the unit sheet, they are easy to visually recognize, and it is easy to recognize that it is a packaging box having the above effects.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0014] First, the packaging box of the present invention will be described. In the state of a single unit sheet 100 before forming the box, as shown in FIG. 2, the front-back, left-right directions are defined. The front side is the direction in which the unit sheet 100 advances in the flexo folder gluer 300 in the manufacturing method described later. The unit sheet 100 that becomes the packaging box of the first embodiment is made of cardboard, and the direction of the corrugations coincides with the front-back direction.

[0015] The unit sheet 100 includes a side portion 110 composed of two side panels 101 and two end panels 102 that are alternately connected in the left - right direction, a glue margin portion 103 connected to one end (here, the left end) in the left - right direction of the side portion 110, outer flaps (upper outer flap 104, lower outer flap 105) connected before and after the side panel 101, and inner flaps (upper inner flap 106, lower inner flap 107) connected before and after the end panel 102. The two upper outer flaps 104 and the two upper inner flaps 106 form a lid portion 120, and the two lower outer flaps 105 and the two lower inner flaps 107 form a bottom portion 130. The side panel 101, end panel 102, upper outer flap 104, lower outer flap 105, upper inner flap 106, and lower inner flap 107 are all rectangular. The glue margin portion 103 is a trapezoid that tapers slightly towards the left side (tip side). The side portion 110 and the lid portion 120 (side panel 101 and upper outer flap 104, and end panel 102 and upper inner flap 106) are foldably connected via an upper horizontal ruled line 141, which is a fold line extending in the left - right direction. The upper horizontal ruled line 141 is the main ruled line in the present invention. The side portion 110 and the bottom portion 130 (side panel 101 and lower outer flap 105, and end panel 102 and lower inner flap 107) are foldably connected via a lower horizontal ruled line 142, which is a fold line extending in the left - right direction. The upper horizontal ruled line 141 and the lower horizontal ruled line 142 are formed in a straight line over the entire left - right length of the unit sheet 100. The side panel 101 and the end panel 102 or the glue margin portion 103 are partitioned by a vertical ruled line 143, which is a fold line extending in the front - rear direction. The flaps are partitioned by a groove portion 144, which is a cut extending in the front - rear direction with a width sufficiently narrower than the left - right length of the flap. The side panel 101 is longer in the left - right length than the end panel 102. The upper outer flap 104 and the lower outer flap 105 have the same left - right length as the side panel 101, and the upper inner flap 106 and the lower inner flap 107 have the same left - right length as the end panel 102. The upper outer flap 104, lower outer flap 105, upper inner flap 106, and lower inner flap 107 all have the same front - rear length, which is 1 / 2 of the left - right length of the end panel 102.

[0016] On the side surface portion 110 (side panel 101 and end face panel 102), a side sub-ruled line 151, which is a folding line extending in the left-right direction, is formed. The side sub-ruled line 151 is positioned closer to the front than the center in the front-rear direction of the side surface portion 110. The side sub-ruled line 151 is parallel to the upper horizontal ruled line 141 (main ruled line) and is formed over the entire length of the side surface portion 110. Note that the side sub-ruled line 151 extends further from the left end of the side surface portion 110 to the pasting margin portion 103. On the lid portion 120 (upper outer flap 104 and upper inner flap 106), a lid sub-ruled line 152, which is a folding line extending in the left-right direction, is formed. The lid sub-ruled line 152 is positioned closer to the front than the center in the front-rear direction of the lid portion 120. The lid sub-ruled line 152 is parallel to the upper horizontal ruled line 141 (main ruled line) and is formed over the entire length of the lid portion 120. The interval between the upper horizontal ruled line 141 (main ruled line) and the side sub-ruled line 151 is equal to the interval between the upper horizontal ruled line 141 (main ruled line) and the lid sub-ruled line 152.

[0017] On the two side panels 101 and the two upper outer flaps 104, a pair of cut lines 160 extending from the side sub-ruled line 151 to the lid sub-ruled line 152 are respectively formed. In this way, the pair of cut lines 160 are formed on the same surface on each surface constituting the side portion 110 (the pair of cut lines 160 are not formed across two surfaces of the side portion 110). The interval between the pair of cut lines 160 is approximately 1 / 5 of the left-right direction length of the side panel 101. In the left side panel 101 and the upper outer flap 104, the pair of cut lines 160 are located to the left of the center in the left-right direction of the side panel 101, and in the right side panel 101 and the upper outer flap 104, the pair of cut lines 160 are located to the right of the center in the left-right direction of the side panel 101. The distance from the left end of the side panel 101 to the left cut line 160 in the left side panel 101 is the same as the distance from the right end of the side panel 101 to the right cut line 160 in the right side panel 101. The pair of cut lines 160 intersect the upper horizontal ruled line 141 (main ruled line). The pair of cut lines 160 are composed of a pair of side cut lines 161 extending from the side sub-ruled line 151 to the upper horizontal ruled line 141 and a pair of lid cut lines 162 extending from the upper horizontal ruled line 141 to the lid sub-ruled line 152. The pair of side cut lines 161 are parallel to each other and extend in the front-rear direction. The pair of lid cut lines 162 extend from the front ends of the respective side cut lines 161 in a direction approaching each other slightly as they go forward. The portion between the pair of cut lines 160 is defined as the tilt piece 163.

[0018] The side panels 101 and end panels 102 at the left and right ends of the unit sheet 100 thus formed are folded, and the adhesive portion 103 is glued to the right end of the side portion 110 to form a tube. Furthermore, the cover portion 120 (upper outer flap 104 and upper inner flap 106) is folded inward to form a top surface, and the bottom portion 130 (lower outer flap 105 and lower inner flap 107) is folded inward to form a bottom surface. In this manner, a rectangular parallelepiped packaging box B is formed as shown in FIG. 3(a). In the cover portion 120, the upper outer flaps 104 are butted against each other, and a gap is formed between the upper inner flaps 106. In the bottom portion 130, the lower outer flaps 105 are butted against each other, and a gap is formed between the lower inner flaps 107. The two tilting pieces 163 are positioned so as to face each other.

[0019] The packaging box B of this first embodiment can be used in the same way as a conventional general cardboard box. That is, the bottom 130 is fixed with tape or the like, the product is accommodated inside, and the lid 120 is also fixed with tape or the like. And, as shown in FIG. 4(a), for example, when a rectangular parallelepiped product P is accommodated without gaps, when taking out the product P from the packaging box B, a finger cannot enter between the product P and the side surface portion 110, and it is difficult to take out as it is. Therefore, first, as shown in FIG. 4(a), the upper outer flap 104 of the lid 120 is opened and overlapped with the side panel 101 (FIG. 3(b) shows a diagram omitting the product in the same state for reference). At this time, at the pair of cut lines 160, the side cut line 161 of the side panel 101 and the lid cut line 162 of the upper outer flap 104 are substantially overlapped, and the tilt piece 163 is in a state of being folded in two. Then, as shown in FIG. 4(b), the two-folded tilt piece 163 is bent by the side sub-ruled line 151 and the lid sub-ruled line 152 and tilted outward (FIG. 3(c) shows a diagram omitting the product in the same state for reference). Thereby, a space S is formed between the product P and the tilt piece 163. Since a finger can be inserted into this space S, the product P can be easily taken out. In addition, since the side sub-ruled line 151 is formed over the entire length of the side surface portion 110 and the lid sub-ruled line 152 is formed over the entire length of the lid portion 120, as shown in FIG. 3(a), the side sub-ruled line 151 and the lid sub-ruled line 152 are easy to visually recognize with the lid portion 120 closed. Also, as shown in FIGS. 3(b), (c) (FIGS. 4(b), (c)), the lid sub-ruled line 152 is easy to visually recognize with the lid portion 120 opened. Thereby, it is easy to recognize that it is the packaging box B having the tilt piece 163 that can be bent.

[0020] As described above, while the pair of side cut lines 161 are parallel, the pair of lid cut lines 162 extend so as to approach each other. That is, in the double-folded tilt piece 163, the inner part (the part formed on the side panel 101) is thicker than the outer part (the part formed on the upper outer flap 104). That is, the inner part of the tilt piece 163 is thicker than the interval between the pair of lid cut lines 162. Then, when the tilt piece 163 is tilted as shown in FIG. 4(b), the inner part of the tilt piece 163 bites into the edge (lid cut line 162) of the upper outer flap 104 (since it is made of cardboard, it can be bitten in without requiring a large force). By the tilt piece 163 biting into the upper outer flap 104 in this way, the state where the tilt piece 163 is tilted is maintained. As a result, the state where the space S is formed is maintained, and the state where the upper outer flap 104 is opened is maintained. If only the upper outer flap 104 is opened, it may return to the closed state, which may hinder the operation of taking out the product P. However, by fixing the upper outer flap 104 in the opened state, the operation of taking out the product P is not hindered. When accommodating the product P, the tilt piece 163 may be tilted in the same manner and fixed with the upper outer flap 104 opened.

[0021] Next, a method for manufacturing this packaging box will be described. This packaging box is manufactured by two devices. The first device used is the corrugator 200, and the second device used is the flexo folder gluer 300. FIG. 1 is an explanatory diagram of the manufacturing method of this packaging box, with the upper part showing the process by the corrugator 200 and the lower part showing the process by the flexo folder gluer 300. In both the upper and lower parts, the left side of the figure is the front side, the right side of the figure is the rear side, and the process proceeds from the rear side to the front side. Also, the near side of the figure is the left side, and the far side of the figure is the right side.

[0022] The corrugator 200 has a forming means 210, a horizontal ruled line forming means 220, a longitudinal cutting means 230, and a unit cutting means 240. The flexo folder gluer 300 has a printing means 310, a vertical ruled line forming means 320, a groove forming means 330, a cut forming means 340, a folding means 350, and a discharging means 360.

[0023] First, the forming step is performed by the forming means 210 of the corrugator 200. In the forming step, the cardboard sheet 10 is formed from the base paper. The sheet 10 consists of a core 11 and liners 12 pasted on both the front and back thereof. The forming means 210 has a core base paper roll 211 around which the base paper of the core 11 is wound and two liner base paper rolls 212 around which the base paper of the liner 12 is wound. First, the core 11 is drawn out from the core base paper roll 211 and processed into a corrugated shape. Then, the liner 12 is drawn out from one liner base paper roll 212 and pasted onto the upper surface of the core 11 to form a single-sided cardboard. Further, the liner 12 is drawn out from the other liner base paper roll 212 and pasted onto the lower surface of the core 11 to form a double-sided cardboard, which becomes the sheet 10. The gluing mechanism for pasting and the like are well-known and the description thereof is omitted. The sheet 10 thus formed is long and is sent in its longitudinal direction (front side direction). The direction of the corrugations of the sheet 10 is orthogonal to the longitudinal direction (front-back direction) (i.e., coincides with the left-right direction). Also, two unit sheets 100 are formed side by side left and right from this sheet 10. In each unit sheet 100, the right side is the upper side when it becomes a box.

[0024] Next, the horizontal ruled line forming step is performed by the horizontal ruled line forming means 220 of the corrugator 200. In the horizontal ruled line forming step, ruled lines are formed along the longitudinal direction of the sheet 10. The ruled lines formed here extend horizontally (laterally) when the box is formed, and thus are called horizontal ruled lines. The horizontal ruled line forming means 220 has a plurality of scorers 221. The scorer 221 has a disk shape and is attached to a shaft portion 222 extending in the left-right direction, and rotates around the left-right direction axis. The rotation direction is clockwise in FIG. 1, that is, the direction in which the sheet 10 is sent forward. By pressing this scorer 221 against the surface of the sheet 10, horizontal ruled lines are formed on the sheet 10. The horizontal ruled lines are formed over the entire length in the longitudinal direction of the sheet 10. Note that FIG. 1 is schematic, and the scorer 221 is located only above the sheet 10, but scorers may be arranged above and below the sheet 10 to sandwich the sheet 10 from above and below. The number and positions of the scorers 221 attached to the shaft portion 222 can be freely set. Here, eight scorers 221 are arranged side by side on the left and right. Note that a plurality of shaft portions 222 may be provided in the front-rear direction, and the scorers 221 may be divided into a plurality of front-rear rows and arranged. As described above, since two unit sheets 100 are formed side by side on the left and right from this sheet 10, four scorers 221 correspond to one unit sheet 100, and four horizontal ruled lines are formed on one unit sheet 100. The four horizontal ruled lines are, from the right side, the lid sub-ruled line 152, the upper horizontal ruled line 141 (main ruled line), the side surface sub-ruled line 151, and the lower horizontal ruled line 142. Thus, in the horizontal ruled line forming step, the long sheet 10 is sent in its longitudinal direction, and the upper horizontal ruled line 141 (main ruled line), the side surface sub-ruled lines 151 located on both sides thereof, the lid sub-ruled line 152, and the lower horizontal ruled line 142 are formed over the entire length in the longitudinal direction of the sheet 10.

[0025] Next, the longitudinal cutting process is performed by the longitudinal cutting means 230 of the collator 200. In the longitudinal cutting process, the sheet 10 is cut along the longitudinal direction. The longitudinal cutting means has a plurality of cutters 231. The cutter 231 is disc-shaped and is attached to a shaft portion 232 extending in the left-right direction, and rotates around the left-right axis. The rotation direction is the clockwise direction in FIG. 1, that is, the direction in which the sheet 10 is sent forward. By this cutter 231, the sheet 10 is cut over the entire length in the longitudinal direction. Note that FIG. 1 is schematic, and the cutter 231 is located above the sheet 10, but a member for receiving the cutter 231 may be provided below the sheet 10, or the upper and lower positions of the cutter and the receiving member may be reversed. The number and position of the cutters 231 attached to the shaft portion 232 can be freely set. Here, three cutters 231 are arranged side by side on the left and right. The central cutter 231 is located at the center of the sheet 10 in the left-right direction, and the left and right cutters 231 are located at the left and right ends of the sheet 10, respectively. By the central cutter 231, the sheet 10 is divided into two parts left and right, and by the left and right cutters 231, the left and right ends of the sheet 10 are cut off.

[0026] Next, the unit cutting process is performed by the unit cutting means 240 of the collator 200. In the unit cutting process, the sheet 10 is cut in a direction perpendicular to its longitudinal direction, and unit sheets 100 are formed. The unit cutting means 240 has an orthogonal cutter 241. The orthogonal cutter 241 has a blade extending linearly in the left-right direction and is provided on the side surface of a columnar shaft portion 242 extending in the left-right direction. The shaft portion 242 rotates around the left-right axis. The rotation direction is the clockwise direction in FIG. 1, that is, the direction in which the sheet 10 is sent forward. With respect to the sheet 10 sent in the longitudinal direction (forward direction), when the orthogonal cutter 241 (shaft portion 242) rotates at a predetermined rotational speed, the sheet 10 is cut in the front-rear direction at a predetermined length. By one cut by the orthogonal cutter 241, two unit sheets 100 are formed on the left and right.

[0027] The unit sheet 100 formed in this way is rectangular and has four horizontal ruled lines formed thereon. This unit sheet 100 is carried out from the outlet of the collator 200 and carried into the inlet of the flexo folder gluer 300. This carrying in and out are known processes and will not be described. A feeder for inserting the unit sheet 100 may be provided at the inlet of the flexo folder gluer 300. The feeding direction of the unit sheet 100 in the flexo folder gluer 300 is different by 90 degrees from the feeding direction in the collator 200. That is, in the flexo folder gluer 300, the unit sheet 100 is fed in a direction orthogonal to the direction in which the horizontal ruled lines (the lid sub-ruled line 152, the upper horizontal ruled line 141, the side sub-ruled line 151, and the lower horizontal ruled line 142) extend. The front side direction in FIG. 2 is the feeding direction, and the feeding direction coincides with the step direction.

[0028] Next, a printing process is performed by the printing means 310 of the flexo folder gluer 300. In the printing process, characters, patterns, etc. are printed on the surface of the unit sheet 100. The printing means 310 has a cylindrical plate cylinder 311 provided with a printing plate on its surface. The ink applied to the printing plate of the plate cylinder 311 is transferred to the surface of the unit sheet 100. The ink supply structure and the like are known and will not be described. A plurality of plate cylinders 311 may be provided for different colors.

[0029] Next, the vertical grid line forming step is performed by the vertical grid line forming means 320 of the flexo folder gluer 300. In the vertical grid line forming step, grid lines are formed along the feeding direction of the unit sheet 100. Here, the grid lines formed are called vertical grid lines 143 because they extend vertically (perpendicularly) when the box is formed. The vertical grid line forming means 320 has a plurality of upper and lower pairs of creasers 321. The creaser 321 is annular and is provided on the side surface of a columnar shaft portion 322 extending in the left-right direction, and rotates around the left-right direction axis. The rotation direction is such that in FIG. 1, the upper creaser 321 rotates clockwise and the lower creaser 321 rotates counterclockwise, that is, in the direction of feeding the unit sheet 100 forward. By sandwiching the unit sheet 100 between the upper and lower pairs of creasers 321, the vertical grid lines 143 are formed on the unit sheet 100. The vertical grid lines 143 are formed over the entire length of the unit sheet 100 in the front-rear direction. The number and positions of the creasers 321 attached to the shaft portion 322 can be freely set. Here, four upper and lower pairs of creasers 321 are provided side by side in the left-right direction. That is, four vertical grid lines 143 are formed on one unit sheet 100. Note that a plurality of shaft portions 322 may be provided in the front-rear direction, and the creasers 321 may be arranged separately in a plurality of front-rear rows. The unit sheet 100 is partitioned by the four vertical grid lines 143 to form the side panels 101 and the end panels 102.

[0030] Next, a groove forming process is performed by the groove forming means 330 of the flexo folder gluer 300. In the groove forming process, the unit sheet 100 is fed in a direction perpendicular to the horizontal grid lines, and the groove portion 144 is formed on the unit sheet 100. Also, in the groove forming process, the front and rear portions of the adhesive margin portion 103 are cut off to form the adhesive margin portion 103. The groove forming means 330 has a groove portion die 331 for forming the groove portion 144 and an adhesive margin portion die 332 for forming the adhesive margin portion 103 corresponding to the cuts of each part. Three groove portion dies 331 are provided. One adhesive margin portion die 332 is provided. Both the groove portion die 331 and the adhesive margin portion die 332 are provided on the side surface of a columnar shaft portion 333 extending in the left - right direction and rotate around the left - right direction axis. The shaft portion 333 is located above the unit sheet 100. Also, columnar receiving portions 334 for receiving the respective dies are provided below the unit sheet 100. The receiving portions 334 rotate around the left - right direction axis. The rotation direction is such that in FIG. 1, the upper shaft portion 333 rotates in the clockwise direction and the lower receiving portion 334 rotates in the counter - clockwise direction, that is, the direction in which the unit sheet 100 is fed in the front direction. By sandwiching the unit sheet 100 between these dies (groove portion die 331 and adhesive margin portion die 332) and the receiving portions 334, the groove portion 144 and the adhesive margin portion 103 are formed on the unit sheet 100. Note that a plurality of shaft portions 333 may be provided in the front - rear direction and the dies may be arranged in a plurality of front - rear rows and divided.

[0031] Next, the indentation forming process is carried out by the indentation forming means 340 of the flexo folder lug 300. In the indentation forming process, the unit sheet 100 is fed in a direction perpendicular to the horizontal grid lines, and a pair of indentation lines 160 that intersect the upper horizontal grid line 141 (main grid line) and extend from the lid sub-grid line 152 to the side sub-grid line 151 are formed on the unit sheet 100. The indentation forming means 340 has an indentation line pattern 341 for forming the indentation lines 160. The indentation line pattern 341 is provided one by one for each of the left and right indentation lines 160 in the pair of indentation lines 160. Here, since two pairs of indentation lines 160 are formed, four indentation line patterns 341 are provided. The indentation line pattern 341 is provided on the side surface of the columnar shaft portion 342 extending in the left-right direction and rotates around the left-right direction axis. The shaft portion 342 is located above the unit sheet 100. Also, a columnar receiving portion 343 for receiving the indentation line pattern 341 is provided below the unit sheet 100. The receiving portion 343 rotates around the left-right direction axis. The rotation direction is such that in FIG. 1, the upper shaft portion 342 rotates in the clockwise direction and the lower receiving portion 343 rotates in the counterclockwise direction, that is, the direction in which the unit sheet 100 is fed in the front direction. By sandwiching the unit sheet 100 between the indentation line pattern 341 and the receiving portion 343, the indentation lines 160 are formed on the unit sheet 100. Note that a plurality of shaft portions 342 may be provided in the front-rear direction, and the indentation line patterns 341 may be arranged in multiple rows in the front-rear direction. Also, the left-right mounting position of the indentation line pattern 341 with respect to the shaft portion 342 can be freely set. Furthermore, a pattern other than the indentation line pattern 341 may be provided on the shaft portion 342, and the shape (type) of the pattern can also be freely set. For example, a pattern for forming a handle hole may be provided to form a handle hole in the indentation forming process.

[0032] Next, the folding process is carried out by the folding means 350 of the flexo folder lug 300. In the folding process, glue is applied to the glue margin portion 103 of the unit sheet 100, the side panel 101 and the end panel 102 on the left and right direction end sides of the unit sheet 100 are folded, and the glue margin portion 103 is glued to the right end of the side portion 110 to make the unit sheet 100 into a cylindrical shape. The folding means 350 is well-known and the description thereof is omitted.

[0033] Next, the discharging step is performed by the discharging means 360 of the flexo folder gluer 300. In the discharging step, the folded and tubular unit sheets 100 are stacked and discharged in predetermined numbers. When stacking the unit sheets 100, they may be sandwiched from the front and rear to correct the displacement during folding. The stacked unit sheets 100 may be bundled in predetermined numbers. The discharging means 360 is known and its description is omitted.

[0034] Thus, the manufacturing of the packaging box by the collator 200 and the flexo folder gluer 300 is completed. Note that some steps may be omitted, or other steps may be added. Also, the order of some steps may be swapped, or a plurality of steps may be performed simultaneously.

[0035] According to such a method for manufacturing a packaging box, in the cut forming step, a pair of cut lines 160 are formed, and a packaging box from which the product P can be easily taken out as described above can be manufactured. And regarding the direction orthogonal to the feeding direction of the unit sheet 100 (the left - right direction in the flexo folder gluer 300), by changing the formation position of the cut line 160, the position and interval of the pair of cut lines 160 can be freely set. To change the formation position of the cut line 160, in the cut forming means 340, the mounting position of the cut line die 341 with respect to the shaft portion 342 may be changed. Also, it is easy to increase the number of the pair of cut lines 160 by adding a cut line die 341 to be attached to the shaft portion 342. And the side secondary ruled lines 151 and the lid secondary ruled lines 152 are formed over the entire left - right length of the unit sheet 100, and since a part of these side secondary ruled lines 151 and lid secondary ruled lines 152 becomes the folding line of the portion between the pair of cut lines 160, regardless of the position and interval of the pair of cut lines 160, there is no need to separately form the horizontal ruled lines that become the folding line.

[0036] In this way, according to the method for manufacturing a packaging box of the present invention, the position, interval, and number of the pair of cut lines 160 can be freely set. Next, examples thereof will be shown.

[0037] Based on FIG. 5, the packaging box of the second embodiment will be described. FIG. 5 shows the state of a single unit sheet 100a before forming the box. The packaging box of the second embodiment differs only in the aspect of a pair of cut lines 160a compared to the first embodiment, so only that point will be described. In the packaging box of the second embodiment, a pair of cut lines 160a extending from the side sub-ruled lines 151 to the lid sub-ruled lines 152 are formed on each of the two side panels 101 and the two upper outer flaps 104. The interval between the pair of cut lines 160a is approximately 3 / 4 of the length of the side panel 101 in the left-right direction. In any of the side panels 101 and the upper outer flaps 104, the pair of cut lines 160a are located at the center of the side panel 101 in the left-right direction. In the second embodiment, the width of the tilting piece 163a, which is the portion between the pair of cut lines 160a, is wider than that in the first embodiment.

[0038] According to such a packaging box of the second embodiment, similar to the first embodiment, by bending the tilting piece 163a and tilting it outward, the stored product can be easily taken out. The width of the tilting piece 163a is wider than that in the first embodiment, and a wider space is formed between the product and the tilting piece 163a, so it can also cope with the case where a larger product is stored. Also, by tilting the tilting piece 163a, the upper outer flap 104 is fixed in an open state.

[0039] A packaging box according to the third embodiment will be described with reference to FIG. 6. FIG. 6 shows a state of one unit sheet 100b before the box is formed. The packaging box according to the third embodiment differs from the first embodiment only in the form of a pair of cut lines 160b, so only this point will be described. In the packaging box according to the third embodiment, a pair of cut lines 160b extending from the side minor line 151 to the lid minor line 152 is formed on the two side panels 101 and the two upper outer flaps 104. This is the same as the pair of cut lines 160 in the first embodiment. Furthermore, a pair of cut lines 160b extending from the side minor line 151 to the lid minor line 152 is also formed on the two end panels 102 and the two upper inner flaps 106. The shape (spacing and shape of the cut) of the pair of cut lines 160b formed on the end panel 102 and the upper inner flap 106 is the same as that formed on the side panel 101 and the upper outer flap 104. In the left end panel 102 and the upper inner flap 106, the pair of cut lines 160b is located to the left of the center in the left-right direction of the end panel 102, and in the right end panel 102 and the upper inner flap 106, the pair of cut lines 160b is located to the right of the center in the left-right direction of the end panel 102. The distance from the left end of the end panel 102 to the left cut line 160b in the left end panel 102 is the same as the distance from the right end of the end panel 102 to the right cut line 160b in the right end panel 102. In the third embodiment, four inclined pieces 163b are formed, one on each surface of the side surface portion 110.

[0040] According to the packaging box of the third embodiment, as in the first embodiment, the tilting pieces 163b are bent and tilted outward to allow the stored product to be easily removed. Since the tilting pieces 163b are arranged on all four sides of the side portion, the product can be easily removed regardless of the way it is stored. In addition, by tilting the tilting pieces 163b, the upper outer flap 104 and the upper inner flap 106 are fixed in the open state.

[0041] The present invention is not limited to the above-described embodiments, and within the scope of the gist of the invention, the shapes and structures of each part can be appropriately changed. For example, a corrugator and a flexo folder gluer are both well-known devices, and those shown in the above embodiments are merely examples. Also, as long as the pair of cutting lines extend from the side sub-ruling lines to the lid sub-ruling lines, they may be curved or the like. Further, when the tilt pieces are respectively formed on the opposing surfaces of the side portions, the two tilt pieces may be formed at positions shifted from each other without facing each other, or the widths of the two tilt pieces may be different.

Explanation of Signs

[0042] 10 Sheet 100 Unit Sheet 110 Side Portion 120 Lid Portion 141 Upper Horizontal Ruling Line (Main Ruling Line) 151 Side Sub-Ruling Line (Sub-Ruling Line) 152 Lid Sub-Ruling Line (Sub-Ruling Line) 160 Cutting Line 200 Corrugator 300 Flexo Folder Gluer B Packaging Box

Claims

1. A method for manufacturing a packaging box made of a cardboard sheet, comprising: feeding the long cardboard sheet in its longitudinal direction, and forming horizontal ruling lines including a main ruling line and two sub-ruling lines located on both sides of the main ruling line over the entire longitudinal length of the sheet; a unit cutting step of cutting the sheet in a direction perpendicular to its longitudinal direction to form a unit sheet for one packaging box; a method for manufacturing a packaging box, characterized by having a notch forming step of feeding the unit sheet in a direction perpendicular to the main ruling line and forming a pair of cutting lines that intersect the main ruling line and extend from one sub-ruling line to the other sub-ruling line with respect to the unit sheet.

2. The method for manufacturing a packaging box according to claim 1, wherein the horizontal ruling line forming step and the unit cutting step are carried out in a corrugator, and the notch forming step is carried out in a flexo folder gluer.

3. Comprising a cardboard sheet, a side surface portion, a lid portion connected to the side surface portion via a main ruling line, a side surface sub-ruling line parallel to the main ruling line and formed over the entire length of the side surface portion, a lid sub-ruling line parallel to the main ruling line and formed over the entire length of the lid portion, and a pair of cutting lines that intersect the main ruling line and extend from the side surface sub-ruling line to the lid sub-ruling line.

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