Manufacturing method of the box body

Abstract

To provide, in a manufacturing method of a box body having a one-touch bottom, the box body having a lower side of a paste section of a side face part forming a side face of a box body being approximately arc shape, a manufacturing method capable of conducting bonding a paste section easily, and a blank for a box body used in the manufacturing method.SOLUTION: In the method, a lower side 18a of a paste section 18 of a blank 1 is formed to an arc shape, as well as a rule mark 22k is formed in a right bottom plate part 22, and a tip of the right bottom plate part 22 is pulled up by using an arm part 112; when the right bottom plate part 22 is folded toward a right side face part 12, by contacting with a deformation part-formed part 122 provided fixed to above a transportation passage of the blank 1, a region involving the rule mark 22k is provided as a concave to form a deformation part. By this, a gap between a region corresponding to a region along a lower side of the paste section 18 at the right bottom plate part 22 and a fourth side face is enlarged, and a region along the lower side 18a of the paste section 18 can be easily inserted to a gap between the right side face part 12 and the right bottom plate part 22.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a box body and a blank used in the manufacturing method, and more particularly to a method for manufacturing a box body having a one-touch bottom and a blank used in the manufacturing method. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a so-called one-touch bottom has been known in which the side portions of a box body are folded flat while the bottom portion is folded, and the side portions are then unfolded to form the bottom portion into a substantially flat plate shape.

[0003] An example of a blank for a box having this one-touch bottom is blank 201 shown in Figure 12, which has a side portion 205, a bottom portion 207 connected to the lower edge of side portion 205, a right flap portion 230 and a left flap portion 232 connected to the upper edge of side portion 205, and a lid portion 240, with side portion 205 having a front side portion 210, a right side portion 212, a left side portion 214, a rear side portion 216, and a glue tab portion 218, and lid portion 240 having a lid main body 242 and a tip portion 244. In addition, the bottom panel portion 207 has a front bottom panel portion 220 connected to the front side panel portion 210, a right bottom panel portion 222 connected to the right side panel portion 212, a left bottom panel portion 224 connected to the left side panel portion 214, and a rear bottom panel portion 226 connected to the rear side panel portion 216, and the front bottom panel portion 220 has a main body portion 220-1 and a tip portion 220-2, and the rear bottom panel portion 226 has a main body portion 226-1 and a tip portion 226-2. In addition, in the unfolded state of the blank 201, the right bottom panel portion 222 and the left bottom panel portion 224 are formed to have the same size and shape, the front bottom panel portion 220 and the rear bottom panel portion 226 are formed to have the same size and shape, and in the right bottom panel portion 222, a straight side portion 222a is provided from the end portion (one end portion of the lower side) opposite to the front side surface portion 210 side of the fold line 213 (which may be the lower side of the right side surface portion 212) between the right side surface portion 212 and the right bottom panel portion 222, and the angle formed by this side portion 222a and the fold line 213 of the right side surface portion 212 is 45 degrees. In other words, the side portion 222a is inclined with respect to the direction of the fold line 213.

[0004] Here, in the glue portion 218 of the blank 201 shown in Figure 12, the bottom edge 218a of the glue portion 218 is at an angle of 45 degrees with respect to the fold line C1 between the rear side portion 216 and the glue portion 218. In this manner, in a box body having a one-touch bottom, it is common for the bottom edge of the glue portion to be configured at an angle of 45 degrees with respect to the fold line between the glue portion and the adjacent side portion (rear side portion).

[0005] In other words, to assemble the bottom portion 207 of the blank 201 shown in Figure 12, i.e., the box body in an unfolded state, i.e., to attach the bottom, as shown in Figure 13, the various parts that make up the bottom portion 207 are folded, and adhesive is applied to the right bottom panel portion 222, the left bottom panel portion 224 and the adhesive margin 218, and then the right side portion 212 is folded relative to the front side portion 210 and the rear side portion 216 is folded relative to the left side portion 214, so that the adhesive margin 218 is adhered to the inner surface of the right side portion 212, the right bottom panel portion 222 is adhered to the tip portion 220-2, and the left bottom panel portion 224 is adhered to the tip portion 226-2, resulting in the state shown in Figure 14.

[0006] The bottom edge 218a of the adhesive portion 218 is at an angle of 45 degrees to the fold line C1, and the side edge 222a is at an angle of 45 degrees to the fold line 213. Therefore, in the state shown in Figure 14, the bottom edge 218a is in line with the side edge 222a, and the adhesive portion 218 and the right bottom panel portion 222 do not overlap, so there is no particular problem in adhering the adhesive portion 218 to the inner surface of the right side portion 212.

[0007] Here, as shown in Figure 15, if the vertical length of the side portion 305 is short, the length of the glue margin 318 will inevitably be short as well, and the area of ​​the glue margin 318 will be small, resulting in a weaker adhesive strength of the glue margin 318 as a whole. In particular, since the angle of the lower edge 318a of the glue margin 318 with respect to the fold line C1 between the rear side portion 316 and the glue margin 318 is 45 degrees, the adhesive strength becomes weaker as it approaches the lower end of the glue margin 318. Furthermore, when adhesive is applied to the glue margin 318, it is not applied to the area close to the fold line C1, resulting in the problem that the lower end area of ​​the glue margin 318 cannot be adhered.

[0008] Note that the blank 301 for a box shown in Figure 15 has the same configuration as blank 201 except that the vertical length of side portion 305 is shorter, and blank 301 has side portion 305, a bottom portion 307 connected to the lower edge of side portion 305, right flap portion 330 and left flap portion 332 connected to the upper edge of side portion 305, and a lid portion 340, side portion 305 has a front side portion 310, a right side portion 312, a left side portion 314, a rear side portion 316, and a glue portion 318, and lid portion 340 has a lid main body 342 and a tip portion 344. The bottom panel 307 has a front bottom panel 320, a right bottom panel 322, a left bottom panel 324, and a rear bottom panel 326. The front bottom panel 320 has a main body 320-1 and a tip 320-2, and the rear bottom panel 326 has a main body 326-1 and a tip 326-2. The angle between the side 222a of the right bottom panel 322 and the bottom side of the right side panel 212 is 45 degrees, and the angle between the bottom side 318a of the margin 318 and the fold line C1 is 45 degrees.

[0009] Therefore, a blank 301' for a box body has a bottom edge 318'a of a side edge portion formed in a substantially arc shape. This increases the adhesive area at the bottom end of the adhesive margin, and improves the adhesive strength of the adhesive margin when the side edge of the box body has a short vertical length and a one-touch bottom. In other words, as in the blank 301' for a box body shown in FIG. 16, the bottom edge 318'a of the adhesive margin 318' is formed in a substantially arc shape. The blank 301' shown in FIG. 16 is the same as the blank 301 shown in FIG. 15, except that the bottom edge 318'a of the adhesive margin 318' is substantially arc shape.

[0010] Incidentally, a measuring container disclosed in Patent Document 1 is an example of a prior art document showing such an example in which the lower edge of the overlap portion of the side surface is formed into a substantially arc shape.

[0011] The process of attaching the bottom portion 307 of blank 301' shown in Figure 16 is the same as that of blank 201, and as shown in Figure 17(a), the various parts that make up the bottom portion 307 are folded, and adhesive is applied to the right bottom panel portion 322, the left bottom panel portion 324 and the adhesive tab 318'.Then, the right side portion 312 is folded against the front side portion 310, and the rear side portion 316 is folded against the left side portion 314, so that the adhesive tab 318' is adhered to the inner surface of the right side portion 312, resulting in the state shown in Figure 17(b). [Prior art documents] [Patent documents]

[0012] [Patent Document 1] JP 2007-64833 A Summary of the Invention [Problem to be solved by the invention]

[0013] However, as shown in Figure 17(b), part of the adhesive portion 318' overlaps with the right bottom panel portion 322, so when changing from the state of Figure 15(a) to the state of Figure 15(b), it is necessary to insert the adhesive portion 318' between the right side portion 312 and the right bottom panel portion 322.This poses a problem that when manufacturing the box using a box manufacturing device, the timing for bending the right side portion 312 relative to the front side portion 310 and the timing for folding the rear side portion 316 relative to the left side portion 314 must be carefully adjusted.

[0014] Therefore, in a manufacturing method for a box body having a one-touch bottom, in which the lower edge of the glue margin of the side portion that forms the side of the box body is approximately arc-shaped, the object is to provide a manufacturing method that makes it easy to glue the glue margin, and a blank for a box body to be used in the manufacturing method. [Means for solving the problem]

[0015] The present invention has been devised to solve the above problems, and firstly, there is provided a method for manufacturing a box having a one-touch bottom, comprising: a blank for a box (which may be a sheet-like blank for a box), the blank having a side portion (5) and a bottom portion (7) connected to the lower edge of the side portion, the side portion having a glue tab portion (18), a first side portion (16), a second side portion (14), a third side portion (10) and a fourth side portion (12), the glue tab portion, the first side portion, the second side portion, the third side portion and the fourth side portion being connected in this order via fold lines; and the bottom portion having a first bottom panel portion ( 26), a second bottom panel portion (24) connected to the second side surface portion via a fold line, a third bottom panel portion (20) connected to the third side surface portion via a fold line, and a fourth bottom panel portion (22) connected to the fourth side surface portion via a fold line, and the glue tab portion (18) has a substantially arc-shaped lower side (18a) and a side side (18b) connected from an upper end of the substantially arc-shaped lower side and substantially parallel to a first fold line (C1) which is a fold line between the glue tab portion and the first side surface portion, and the region along the lower side of the glue tab portion is parallel to a first straight line which is the first fold line or an extension line (C1') of the first fold line and a second straight line which is a fold line between the first side surface portion and the first bottom panel portion. The first bottom plate portion is formed by protruding from an imaginary straight line (Q) that forms an angle of approximately 45 degrees upward with respect to the first straight line from an intersection (P) with the second straight line, which is the fold line (17) or an extension (17') of the second fold line, and the first bottom plate portion has a first main body portion (26-1) connected to the first side surface portion via the fold line and a first tip portion (26-2) connected to the first main body portion via the fold line, the third bottom plate portion has a second main body portion (20-1) connected to the third side surface portion via the fold line and a second tip portion (20-2) connected to the second main body portion via the fold line, and the fourth bottom plate portion is formed by protruding from a third bottom plate portion of the fourth bottom plate portion. the fourth bottom panel portion has an inclined side (22a) which is an edge portion on the opposite side to the fourth side portion and forms an angle of approximately 45 degrees with a third fold line (13) which is a fold line between the fourth side portion and the fourth bottom panel portion, and a crease line (22k) for forming a deformation portion is provided on the fourth bottom panel portion from the inclined side and approximately parallel to the third fold line, and the crease line for forming a deformation portion is formed by pressing a crease from a surface which becomes the inside of the box body, and the length (L1) from the contact point (J) of the crease line for forming a deformation portion and the inclined piece to the third fold line is formed shorter than the length (L2) from the end (S) on the side side of the lower side of the glue tab portion to an extension line of the second fold line, and a crease is formed along the third fold line,In a blank for a box body in which the crease along the third fold line is formed by pressing from a surface that will become the inside of the box body, in a bottom panel folding process in which the first bottom panel portion is folded against the first side panel portion and the first tip portion is folded against the first main body portion, the third bottom panel portion is folded against the third side panel portion and the second tip portion is folded against the second main body portion, the second bottom panel portion is folded against the second side panel portion, and the fourth bottom panel portion is folded against the fourth side panel portion, at any time from the start to the end of folding of the fourth bottom panel portion against the fourth side panel portion, a bottom portion bending step for forming a deformed portion (W) by making an area including the ruled lines for forming a shape concave when viewed from the surface that becomes the inside of the box body; an adhesive application step for applying adhesive to the outside surface of the glue tab and applying adhesive to either the second bottom panel portion or the first tip portion and either the fourth bottom panel portion or the second tip portion; and a bonding step for folding the first side portion relative to the second side portion and folding the fourth side portion relative to the third side portion to bond the glue tab to the inside surface of the fourth side portion, bonding the second bottom panel portion to the first tip portion, and bonding the fourth bottom panel portion to the second tip portion. In the bottom portion bending step, the blank is conveyed by the conveying means with the bottom portion side at the front and the surface that will become the inside of the box body at the top, and the blank is conveyed with the tip of the fourth bottom plate portion of the conveyed blank hooked by the rotatably provided arm portion, so that the arm portion rotates upward with the tip of the fourth bottom plate portion hooked, and the tip side of the fourth bottom plate portion is lifted up, and in the deformation portion forming section that is fixedly provided above the conveying path of the blank conveyed by the conveying means, the deformation portion forming section (122) has a rod-shaped portion (122-1) on the downstream side in the conveying direction of the blank, and in the state where the tip side of the fourth bottom plate portion is lifted up, the fourth bottom plate portion is rotated relative to the fourth side portion, and a deformation portion is formed by contacting a region including the deformation portion forming ruled line of the fourth bottom plate portion. It is characterized by:

[0016] In the first configuration, a deformed portion is formed in the fourth bottom panel portion in the bottom panel bending process, so that when the glue tab is bonded to the fourth side panel portion in the bonding process, the gap between the fourth side panel portion and the fourth bottom panel portion, specifically, the gap between the area along the lower edge of the glue tab on the fourth bottom panel portion and the fourth side panel portion, corresponding to the area, is widened, making it easy to insert the glue tab, particularly the area along the lower edge, into the gap between the fourth side panel portion and the fourth bottom panel portion, and there is no need to precisely adjust the timing of folding the fourth side panel portion and the first side panel portion, and the glue tab can be easily bonded.

[0017] In particular, since the crease along the third fold line is formed by pressing from the inner surface of the box body, the fourth bottom panel portion is more likely to bend relative to the fourth side surface portion and the gap between the fourth side surface portion and the fourth bottom panel portion tends to narrower than in the case of pressing from the outer surface of the box body. Therefore, by widening the gap with the deformed portion, it is possible to make it easier to insert the glue portion into the gap between the fourth side surface portion and the fourth bottom panel portion. Furthermore, the deformation portion can be formed simply by fixing the deformation portion forming portion above the blank transport path, and by taking advantage of the fact that the tip side of the fourth bottom panel portion is pulled up by the arm portion, a configuration that forms the deformation portion at low cost can be realized.

[0018] In addition, in the above first configuration, a first score line is formed along the first fold line, a second score line is formed along the second fold line, a third score line is formed along the third fold line, a fourth score line is formed along the fold line between the first side portion and the second side portion, a fifth score line is formed along the fold line between the second side portion and the third side portion, a sixth score line is formed along the fold line between the third side portion and the fourth side portion, a seventh score line is formed along the fold line between the second side portion and the second bottom plate portion, an eighth score line is formed along the fold line between the third side portion and the second main body portion, a ninth score line is formed along the fold line between the first main body portion and the first tip portion, and a tenth score line is formed along the fold line between the second main body portion and the second tip portion, and the first score line, the second score line, the third score line, the fourth score line, the fifth score line, the sixth score line, the seventh score line, the eighth score line, the ninth score line, and the tenth score line may be formed by pressing from the surface that will become the inside of the box body.

[0019] Secondly, in the above-mentioned first configuration, the length (L3) of the blank from the end portion opposite the inclined side side of the deformation portion forming ruled line to the extension line of the edge portion (D) opposite the third side portion side of the fourth side portion is approximately the same as the length (L4) from the end portion (S) on the side side of the lower side of the glue portion to the first fold line.

[0020] Therefore, the length of the deformed portion in the direction of the deformation portion forming ruled line can be made longer than at least the width of the overlap portion, making it easier for the overlap portion to fit into the deformed portion in the bonding process.

[0021] Thirdly, in the above-mentioned first or second configuration, the length (L1) from the junction (J) of the deformation portion forming rule and the inclined piece to the third fold line is approximately half the length (L2) from the end (S) on the side edge of the lower edge of the glue portion to the extension line of the second fold line.

[0022] Therefore, the center position of the deformed portion in the direction perpendicular to the third fold line can be made to approximately coincide with the center position of the glue portion in the direction along the first fold line, making it easier for the area along the lower edge of the glue portion to fit into the deformed portion. Effect of the Invention

[0033] According to the manufacturing method of a box body based on the present invention, a deformed portion is formed in the fourth bottom panel portion in the bottom panel bending process, so that when the glue tab is bonded to the fourth side panel portion in the bonding process, the gap between the fourth side panel portion and the fourth bottom panel portion, specifically, the gap between the area along the lower edge of the glue tab on the fourth bottom panel portion and the fourth side panel portion, is widened, making it easy to insert the glue tab, particularly the area along the lower edge, into the gap between the fourth side panel portion and the fourth bottom panel portion, and there is no need to precisely adjust the timing of folding the fourth side panel portion and the first side panel, and the glue tab can be easily bonded.

[0034] In particular, since the crease along the third fold line is formed by pressing from the inner surface of the box body, the fourth bottom panel portion is more likely to bend relative to the fourth side surface portion and the gap between the fourth side surface portion and the fourth bottom panel portion tends to narrower than in the case of pressing from the outer surface of the box body. Therefore, by widening the gap with the deformed portion, it is possible to make it easier to insert the glue portion into the gap between the fourth side surface portion and the fourth bottom panel portion. Furthermore, the deformation portion can be formed simply by fixing the deformation portion forming portion above the blank transport path, and by taking advantage of the fact that the tip side of the fourth bottom panel portion is pulled up by the arm portion, a configuration that forms the deformation portion at low cost can be realized. [Brief description of the drawings]

[0037] [Figure 1] FIG. 4 is a plan view of the blank as seen from the outer surface of the box body. [Diagram 2] FIG. 4 is a plan view of the blank as seen from the inner surface of the box body. [Diagram 3] FIG. 2 is an enlarged view of a main part of FIG. [Figure 4] 10 is a flowchart showing a method for manufacturing a box using a blank. [Diagram 5] 11 is a plan view showing a method for manufacturing a box using a blank. FIG. [Figure 6] 11 is a plan view showing a method for manufacturing a box using a blank. FIG. [Figure 7] FIG. 11 is a side view showing a method for manufacturing a box using a blank. [Figure 8] FIG. 11 is a diagram showing the right bottom panel portion in which a deformation portion is formed, where (a) is a plan view, (b) is a right side view, (c) is a left side view, (d) is a front view, (e) is a rear view, and (f) is a cross-sectional view taken along line AA in (a). [Figure 9] FIG. 13 is a plan view showing the state immediately before the adhesive portion is adhered to the right side view. [Figure 10] FIG. 13 is a rear view showing the state immediately before the adhesive portion is adhered to the right side view. [Figure 11] 11 is a perspective view showing a state seen from the direction B in FIG. [Figure 12] FIG. 1 is a plan view showing a conventional box blank. [Figure 13] 13 is a plan view showing a method for manufacturing a box using the blank of FIG. 12. [Figure 14] 13 is a plan view showing a method for manufacturing a box using the blank of FIG. 12. [Figure 15] FIG. 1 is a plan view showing a conventional box blank. [Figure 16] FIG. 1 is a plan view showing a conventional box blank. [Figure 17] 17 is a plan view showing a method for manufacturing a box using the blank of FIG. 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] In the present invention, in a manufacturing method for a box body having a one-touch bottom, in which the lower edge of the glue tab of the side portion forming the side of the box body is approximately arc-shaped, the objective of providing a manufacturing method that makes it easy to bond the glue tab and a blank for a box body to be used in the manufacturing method is achieved in the following manner.

[0039] A blank 1 for a box body for realizing a manufacturing method of the bottom portion of a box body based on the present invention is a sheet-like blank and is configured as shown in Figures 1 and 2, and the blank 1 has a side portion 5, a bottom portion 7 connected to the lower edge of the side portion 5, a right flap portion 30 and a left flap portion 32 connected to the upper edge of the side portion 5, and a lid portion 40, the side portion 5 has a front side portion (third side portion) 10, a right side portion (fourth side portion) 12, a left side portion (second side portion) 14, a rear side portion (first side portion) 16, and a glue margin portion 18, and the lid portion 40 has a lid portion main body 42 and a tip portion 44.

[0040] Moreover, the blank 1 is formed by punching out a sheet-like member in order to manufacture a box, and is made of corrugated cardboard (for example, thin corrugated cardboard). In other words, the box manufactured from the blank 1 is a box formed of a corrugated cardboard material (particularly, double-sided corrugated cardboard material).

[0041] In blank 1, the lower edge of side portion 5 (the boundary line with bottom portion 7), i.e., the fold line (8th fold line) 11 between front side portion 10 and front bottom plate portion 20, the fold line (3rd fold line) 13 between right side portion 12 and right bottom plate portion 22, the fold line (7th fold line) 15 between left side portion 14 and left bottom plate portion 24, and the fold line 17 between rear side portion 16 and rear bottom plate portion 26 are formed on a single straight line.

[0042] In addition, the fold line (first fold line) C1 between the glue portion 18 and the rear side portion 16, the fold line (fourth fold line) C2 between the rear side portion 16 and the left side portion 14, the fold line (fifth fold line) C3 between the left side portion 14 and the front side portion 10, and the fold line (sixth fold line) C4 between the front side portion 10 and the right side portion 12 are parallel to each other and perpendicular to the direction of the lower edge of the side portion 5.

[0043] The horizontal length of the front side portion 10 (the length between the fold lines C3 and C4) and the horizontal length of the rear side portion 16 (the length between the fold lines C1 and C2) are formed to be the same, and the horizontal length of the right side portion 12 (the length between the fold line C4 and the side portion D of the right side portion 12 opposite to the fold line C4) and the horizontal length of the left side portion 14 (the length between the fold lines C2 and C3) are approximately the same, but the horizontal length of the right side portion 12 is formed to be slightly shorter than the horizontal length of the left side portion 14. The horizontal length of the right side portion 12 and the horizontal length of the left side portion 14 may be the same.

[0044] The glue margin portion 18 is surrounded by a fold line C1, a lower edge 18a connected to the lower end of the fold line C1, a side edge 18b connected to the lower edge 18a, and an upper edge 18c connected to the side edge 18b. The lower edge 18a is arc-shaped (or may be approximately arc-shaped), and the lower end region of the glue margin portion 18 bulges out in an arc shape downward. The side edge 18b is linear and parallel to the fold line C1 (or may be approximately parallel), and the upper edge 18c is linear and inclined at an acute angle to the fold line C1 (i.e., inclined downward toward the side edge 18b).

[0045] The tangent to the lower end of the lower side 18a (the point of contact with the folded line C1) is parallel to the folded line 17, and the tangent to the upper end of the lower side 18a (the point of contact with the side side 18b) is in the direction of the side side 18b. In other words, the lower side 18a has a quarter circular arc shape.

[0046] Since the bottom side 18a of the margin 18 is arc-shaped, the margin 18 (particularly the region along the bottom side 18a of the margin 18) is formed to protrude obliquely downward from a virtual straight line Q that forms an angle of 45 degrees (or may be approximately 45 degrees) upward from the intersection P of an extension C1' (first straight line) of the fold line C1 and an extension 17' (second straight line) of the fold line 17 with respect to the first straight line (i.e., α is 45 degrees). In other words, in a box body that has been manufactured, when the box body is folded flat, the side 22a of the right bottom panel 22 is in a state along the virtual straight line Q, so that the margin 18 and the right bottom panel 22 overlap (see FIG. 6(e)).

[0047] In the example of Figure 3, since the fold line C1 is not formed in the height direction to the position of the fold line 17, and the fold line 17 is not formed in the horizontal direction to the position of the fold line C1, the intersection point P is the intersection point of the extension line C1' of the fold line C1 and the extension line 17' of the fold line 17. However, in Figure 3, if the fold line C1 is formed in the height direction to the position of the fold line 17, and the fold line 17 is not formed in the horizontal direction to the position of the fold line C1, the intersection point P is the intersection point of the extension line of the fold line 17 and the fold line C1. If the fold line 17 is formed in the horizontal direction to the position of the fold line C1, and the fold line C1 is not formed in the height direction to the position of the fold line 17, the intersection point P is the intersection point of the extension line of the fold line C1 and the fold line 17. If the fold line C1 is formed in the height direction to the position of the fold line 17, and the fold line 17 is formed in the horizontal direction to the position of the fold line C1, the intersection point P is the intersection point of the fold line 17 and the fold line C1. In other words, the intersection point P is an intersection point between the broken line C1 or a first straight line which is an extension of the broken line C1, the broken line 17, and a second straight line which is an extension of the broken line 17.

[0048] The bottom panel portion 7 has a front bottom panel portion (third bottom panel portion) 20 connected to the front side panel portion 10 via fold line 11, a right bottom panel portion (fourth bottom panel portion) 22 connected to the right side panel portion 12 via fold line 13, a left bottom panel portion (second bottom panel portion) 24 connected to the left side panel portion 14 via fold line 15, and a rear bottom panel portion (first bottom panel portion) 26 connected to the rear side panel portion 16 via fold line (second fold line) 17, and the front bottom panel portion 20 has a main body portion (second main body portion) 20-1 and a tip portion (second tip portion) 20-2, and the rear bottom panel portion 26 has a main body portion (first main body portion) 26-1 and a tip portion (first tip portion) 26-2.

[0049] The right bottom panel portion 22 has a straight edge portion (inclined edge) 22a, a straight edge portion 22b connected from the end of edge portion 22a, an approximately arc-shaped edge portion 22c connected from the end of edge portion 22b, and a straight edge portion 22d connected from the end of edge portion 22c, where edge portion 22a is the edge portion on the opposite side of the front bottom panel portion 20 of the right bottom panel portion 22 and is inclined with respect to the fold line 13, edge portion 22a forms an angle of 45 degrees (or may be approximately 45 degrees) with respect to the direction of fold line 13, edge portion 22b is approximately parallel to fold line 13, edge portion 22d is inclined with respect to fold line 13, and edge portion 22d forms an acute angle with respect to fold line 13.

[0050] Furthermore, in the right bottom panel portion 22, since the right side portion 12 is adhered to the glue portion 18, the horizontal length of the right side portion 12 is formed slightly shorter than the horizontal length of the left side portion 14. Therefore, between the end of the fold line 13 and the end of the side portion 22a, there is provided a side portion 22e, which is an extension of the side portion D opposite the fold line C4 of the right side portion 12, and if it is assumed that the length between the fold line C4 and the side portion D is the same as the length between the fold line C2 and the fold line C3, and if it is assumed that the fold line 13 is also longer by that amount, the extension of the side portion 22a is formed so as to contact the end portion on the rear side of the fold line 13 (which may be the lower end of the side portion D).

[0051] Furthermore, in the right bottom panel portion 22, a crease (crease for forming a deformed portion) 22k that is parallel to the fold line 13 is formed from a position on the side portion 22e side of the side portion 22a. This crease 22k is formed by pressing from the surface side that will be the inside of the box body formed by the blank 1. In other words, the crease 22k is formed by pressing from the side shown in FIG.

[0052] Here, the specific formation position of the ruled line 22k is such that the length L1 from the contact point J between the ruled line 22k and the side portion 22a to the broken line 13 (which may also be the length L1 between the ruled line 22k and the broken line 13) is shorter than the length L2 from the end portion S on the side 18b side of the substantially arc-shaped lower side 18a of the adhesive margin portion 18 (the upper end of the lower side 18a (the contact point between the lower side 18a and the side 18b)) to the extension line of the broken line 17 (that is, the length along the direction of the broken line C1) (that is, L1 < L2), and the length L1 is approximately half of the length L2 (that is, L1 ≒ L2 / 2). That is, by pushing the position of the ruled line 22k with a deformation portion forming unit 120 (described later), a deformation portion W (see FIG. 8) is formed by making the region including the ruled line 22k concave (described later), but when the adhesive margin portion 18 is adhered to the inner surface of the right side surface portion 12 (particularly, when the adhesive margin portion 18 is inserted into the gap between the right side surface portion 12 and the right bottom plate portion 22 from the state shown in FIGS. 9 to 11 (described later)), by setting L1 < L2, a deformation portion is formed in the region corresponding to the position of the adhesive margin portion 18 on the right bottom plate portion 22, so that the region along the lower side 18a of the adhesive margin portion 18 easily enters the deformation portion W. In particular, by setting L1 ≒ L2 / 2, the central position in the direction perpendicular to the broken line 13 in the deformation portion W can be made to substantially coincide with the central position in the direction along the broken line C1 of the adhesive margin portion 18, and the region along the lower side 18a of the adhesive margin portion 18 more easily enters the deformation portion W.

[0053] Also, the length L3 from the end portion of the ruled line 22k on the side opposite to the side portion 22a to the extension line of the side portion D of the right side surface portion 12 is the same (may also be substantially the same) as the length L4 from the upper end of the lower side 18a of the adhesive margin portion 18 to the broken line C1 (which may also be the lateral length of the adhesive margin portion 18 (the length between the broken line C1 and the side 18b)). Thereby, the length (lateral length (the direction of the ruled line 22k)) of the deformation portion W can be made at least the length of the length L3 (see FIG. 8), so when the adhesive margin portion 18 is adhered to the inner surface of the right side surface portion 12 (particularly, when the adhesive margin portion 18 is inserted into the gap between the right side surface portion 12 and the right bottom plate portion 22 from the state shown in FIGS. 9 to 11 (described later)), the adhesive margin portion 18 is made to easily enter the deformation portion W.

[0054] The left bottom panel 24 has substantially the same configuration as the right bottom panel 22, but has sides 24a, 24b, 24c, and 24d, and does not have a side corresponding to side 22e, nor does it have a ruled line corresponding to ruled line 22k. Side 24a forms an angle of 45 degrees (or may be approximately 45 degrees) with respect to the direction of fold line 15.

[0055] Since the formation of the deformed portion W results in a concave recess U on the inner surface of the right bottom panel portion 22, a convex protrusion V is naturally formed on the opposite outer surface (see FIG. 8). The creases 22k are formed horizontally, and the deformed portion W is formed along the creases 22k, so the deformed portion W also basically has a horizontal shape. The creases 22k are formed by pressing from the surface that will be the inner surface of the box body, so it can be said that the deformed portion W is easily formed on the inner surface of the right bottom panel portion 22. In other words, it is easier to form the deformed portion W than when the creases 22k are formed by pressing from the surface that will be the outer surface of the box body.

[0056] The front bottom panel 20 and the rear bottom panel 26 are formed to have the same size and shape, and the front bottom panel 20 has a main body 20-1 and a tip 20-2 connected to the main body 20-1 via a fold line (tenth fold line) 20a, and the inner surface of the tip 20-2 is bonded to the outer surface of the right bottom panel 22. The extension of the fold line 20a is configured to pass through the junction of the extension of the fold line C4 and the extension of the fold line 11. The rear bottom panel 26 has a main body 26-1 and a tip 26-2 connected to the main body 26-1 via a fold line (ninth fold line) 26a, and the inner surface of the tip 26-2 is bonded to the outer surface of the left bottom panel 24. The extension of the fold line 26a is configured to pass through the junction of the extension of the fold line C2 and the extension of the fold line 17. The fold line 20a is inclined at an angle of 45 degrees (or may be approximately 45 degrees) with respect to the direction of the fold line 11, and the fold line 26a is inclined at an angle of 45 degrees (or may be approximately 45 degrees) with respect to the direction of the fold line 17.

[0057] In addition, a cutout portion 20b formed from a right-angled side portion is formed in main body portion 20-1, and a cutout portion 26b formed from a right-angled side portion is formed in main body portion 26-1. By expanding side portion 5 into a rectangular tube shape, cutout portion 20b and cutout portion 26b engage with each other, and bottom portion 7 is assembled.

[0058] In addition, the right flap portion 30 is connected to the upper edge of the right side portion 12 via a fold line, the left flap portion 32 is connected to the upper edge of the left side portion 14 via a fold line, the lid main body 42 is connected to the upper edge of the rear side portion 16 via a fold line, and the tip portion 44 is connected to the edge of the lid main body 42 opposite the rear side portion 16 via a fold line.

[0059] In blank 1, creases are provided along the fold lines, and specifically, creases (creases for folding) are formed by pressing from the surface side that will be the inside of a box formed from blank 1. In other words, the creases are formed by pressing from the side shown in FIG. 2, and the creases are formed along the fold lines shown by thin lines in blank 1.

[0060] The scores on blank 1, including score 22k and the scores other than score 22k, are both formed by pressing from the side of the box that will be the inside of the box body, so that when blank 1 is manufactured by punching out the blank from a cardboard sheet using a Thompson process, score 22k and the scores other than score 22k can be formed simultaneously.

[0061] A method for manufacturing a box using blank 1 having the above configuration, i.e., a box-making method (i.e., a bottom-pasting method), will be described with reference to Figures 4 to 11. As shown in Figure 4, first, each part constituting bottom portion 7 is folded (bottom portion folding step (S11)).

[0062] The bottom panel folding section, which is a component that performs the bottom panel folding process in a box making machine that manufactures boxes from blanks, includes a conveying means (specifically, a conveying belt (not shown)) for transporting the blank 1 in an unfolded state, a front bottom panel folding section 104 for folding the front bottom panel section 20, a right bottom panel folding section 102 for folding the right bottom panel section 22, a left bottom panel folding section 106 for folding the left bottom panel section 24, a rear bottom panel folding section 108 for folding the rear bottom panel section 26, and a deformation section forming unit 120 for forming a deformation section at the position of the score line 22k (see Figures 5(b) and 6(c)).

[0063] The front bottom plate bending portion 104 and the rear bottom plate bending portion 108 are provided upstream of the right bottom plate bending portion 102 and the left bottom plate bending portion 106 in the blank conveying direction, and the front bottom plate bending portion 104 and the rear bottom plate bending portion 108 are provided at the same position (may be approximately the same position) in the blank conveying direction. The right bottom plate bending portion 102 and the left bottom plate bending portion 106 are provided at the same position in the blank conveying direction. Although the right bottom plate bending portion 102 and the left bottom plate bending portion 106 are described as being provided at the same position in the blank conveying direction, they may be provided at approximately the same position, for example, the right bottom plate bending portion 102 may be provided downstream of the left bottom plate bending portion 106.

[0064] The front bottom panel bending portion 104 has an arm unit 117 for hooking the front bottom panel portion 20 (particularly, the main body portion 20-1) and a guide portion 137 for folding the tip portion 20-2 relative to the main body portion 20-1 and holding the main body portion 20-1 in a folded-back state relative to the front side portion 10 with the tip portion 20-2 folded back relative to the main body portion 20-1. The rear bottom panel bending portion 108 has an arm unit 118 for hooking the rear bottom panel portion 26 (particularly, the main body portion 26-1) and a guide portion 137 for folding the tip portion 26-2 relative to the main body portion 26-1 and holding the main body portion 26-1 in a folded-back state relative to the rear side portion 16. and a guide portion 138 for holding the right bottom panel portion 22 in a folded-back state with the tip portion 26-2 folded back against the main body portion 26-1 (see FIG. 5(b)), the right bottom panel bending portion 102 has an arm unit 110 for hooking the right bottom panel portion 22 and a guide portion 130 for holding the right bottom panel portion 22 in a folded-back state with respect to the right side portion 12, and the left bottom panel bending portion 106 has an arm unit 116 for hooking the left bottom panel portion 24 and a guide portion 136 for holding the left bottom panel portion 24 in a folded-back state with respect to the left side portion 14 (see FIG. 6(c)). The blank 1 is transported on the transport rail H by the transport means.

[0065] Here, since arm unit 110, arm unit 116, arm unit 117, and arm unit 118 have the same configuration, arm unit 110 will be described as an example. Arm unit 110 has arm portion 112 and support portion 114 that rotatably supports arm portion 112. Arm portion 112 has arm portion main body 112a of a strip-shaped portion and hook portion 112b that is provided at the tip of arm portion main body 112a and is bent relative to arm portion main body 112a, so that hook portion 112b hooks onto the tip of right bottom plate portion 22 of blank 1 that is conveyed. Support portion 114 is pivotally supported around the end portion on the base end side of arm portion 112 so as to be rotatable along the conveying direction of blank 1. In other words, support portion 114 is provided in a fixed state (i.e., in a state where it is fixed to a fixed object (e.g., a frame) of the can making device). It should be noted that the arm portion 112 is merely rotatably supported by the support portion 114, and the arm portion 112 itself is not rotationally driven.

[0066] The arm units other than arm unit 110 have the same configuration as arm unit 110, with the tip of the arm portion of arm unit 116 hooked onto the tip of the left bottom panel portion 24, the tip of the arm portion of arm unit 117 hooked onto the tip of the front bottom panel portion 20 (particularly, main body portion 20-1), and the tip of the arm portion of arm unit 118 hooked onto the tip of the rear bottom panel portion 26 (particularly, main body portion 26-1).

[0067] The deformation-section forming unit 120 has a deformation-section forming section 122 and a support section 124 that supports the deformation-section forming section 122 in a suspended state. The deformation-section forming section 122 is generally rod-shaped and curved in a substantially arc shape. The deformation-section forming section 122 is fixedly provided above the conveying path of the blank 1 and is provided along the conveying direction of the blank 1 (the direction indicated by the white arrow in Figs. 5 to 7). In plan view, as shown in Fig. 5, the deformation-section forming section 122 is provided parallel to the conveying direction of the blank 1, and in side view, the deformation-section forming section 122 is curved downward from the upstream side to the downstream side in the conveying direction, and the inclination angle with respect to the horizontal direction (the direction of the blank conveying surface (the virtual conveying surface through which the lower surface of the blank passes)) gradually decreases from the upstream side to the downstream side. The cross section of the deformation-section forming section 122 is circular, and the shape of the downstream end (tip 122a) that contacts the right bottom plate section 22 is a circular planar shape. The shape of the tip 122a of the deformation portion forming portion 122 may be substantially hemispherical. The deformation portion forming portion 122 has a rod shape, and at least has a rod-shaped portion 122-1 having a rod shape on the downstream side in the conveying direction of the blank 1, and the tip 122a is provided on the downstream side of the rod-shaped portion 122-1 in the blank conveying direction.

[0068] The deformation portion forming portion 122 is fixed at a position spaced from the upper surface of the blank 1 with the blank 1 located directly below the deformation portion forming portion 122, and the tip portion 122a of the deformation portion forming portion 122 is adapted to contact the position of the line 22k of the right bottom panel portion 22 when the tip side is pulled up and rotated by the arm portion 112.

[0069] More specifically, it is preferable that the tip 122a of the deformation portion forming portion 122 is tangent to the horizontal center position of the line 22k in the horizontal direction (the direction of the fold line 13), and that the line 22k is tangent to the center of the tip 122a (the center of the circle) in the vertical direction (the direction perpendicular to the direction of the fold line 13) (Figure 8).

[0070] Supporting portion 124 is fixed to deformation-portion forming portion 122 and has a rod shape extending in the vertical direction. Supporting portion 124 is fixed (i.e., fixed to a fixed object of the can manufacturing device), and thus deformation-portion forming unit 120 is fixed as a whole.

[0071] The installation position of the deformation portion forming unit 120 in the conveying direction of the blank 1 is a position where, as the blank 1 is conveyed, the right bottom panel portion 22 is caught by the arm portion 112, the tip side of the right bottom panel portion 22 is pulled up and the right bottom panel portion 22 rotates relative to the right side surface portion 12, and the rotated right bottom panel portion 22 comes into contact with the tip portion 122a at a timing when it is inclined relative to the horizontal direction (see FIG. 7(b)), and the support portion 124 of the deformation portion forming unit 120 is provided slightly downstream in the conveying direction than the support portion 114 of the arm unit 110. In other words, as the tip side of the right bottom panel portion 22 is pulled up, the right bottom panel portion 22 rotates relative to the right side surface portion 12, and the tip portion 122a comes into contact with the area including the ruled line 22k of the right bottom panel portion 22, thereby forming the deformation portion W.

[0072] By pressing the position of the crease 22k of the right bottom plate portion 22 with the deformation-portion forming portion 122, a deformation portion W is formed in the right bottom plate portion 22. In other words, since the crease 22k is provided, it is easy to form the deformation portion W by pressing the area including the crease 22k with the deformation-portion forming portion 122.

[0073] In the example of Figure 7, the deformed portion W is formed when the right bottom panel portion 22 is tilted as shown in Figure 7(b), but it is sufficient that the right bottom panel portion 22 contacts the tip portion 122a to form the deformed portion W at any time during the period from the start of bending the right bottom panel portion 22 relative to the right side portion 12 (which may be the time when bending begins) (which may be the time when the arm portion 112 starts to pull up the tip side of the right bottom panel portion 22) to the end of bending (which may be the time when folding is completed) (which may be the time when the right bottom panel portion 22 is folded back relative to the right side portion 12).

[0074] The right bottom plate portion 22 may come into contact with the tip portion 122a to form the deformed portion W at any time between when bending of the right bottom plate portion 22 relative to the right side portion 12 begins and when the angle of the right bottom plate portion 22 relative to the right side portion 12 becomes 90 degrees. Also, bending of the right bottom plate portion 22 relative to the right side portion 12 may begin when the angle of the right bottom plate portion 22 relative to the right side portion 12 becomes greater than 0 degrees.

[0075] In this way, by simply fixing the deformation portion forming portion 122 above the conveying path of the blank 1, the deformation portion W can be formed by utilizing the fact that the tip side of the right bottom panel portion 22 is pulled up by the arm portion 112, so that a configuration for forming the deformation portion W at low cost can be realized.

[0076] In addition, since each guide section in the guide sections 130 and 136 has the same configuration, the guide section 130 will be described as an example. The guide section 130 has a guide section main body 132 and a support section 134 that supports the guide section main body 132 in a suspended state. The guide section main body 132 is generally plate-shaped and has an inclined section 132a provided on the upstream side in the conveying direction of the blank 1 and a horizontal section 132b that is connected to the end of the inclined section 132a on the downstream side in the conveying direction and extends to the downstream side, the inclined section 132a is formed so as to be inclined upward as it goes upstream, the horizontal section 132b is provided parallel to the conveying surface of the blank, and the inclined section 132a and the horizontal section 132b are fixedly provided at positions spaced from the upper surface of the blank 1 when the blank 1 is located directly below the guide section main body 132.

[0077] Support portion 134 is fixed to guide portion main body 132 and has a rod shape extending in the vertical direction. Support portion 134 is fixed (i.e., fixed to a fixed object of the can manufacturing device), and thus guide portion 130 as a whole is fixed.

[0078] As the blank 1 is transported toward the guide portion 130, the right bottom panel portion 22, which has been folded back against the right side portion 12 by the arm portion 112, is further folded back against the right side portion 12 while contacting the inclined portion 132a, and while folded back against the right side portion 12, the right bottom panel portion 22 passes below the horizontal portion 132b while contacting the underside of the horizontal portion 132b, until the right bottom panel portion 22 is sufficiently folded back against the right side portion 12.

[0079] Guide portion 136 has the same configuration as guide portion 130, and left bottom panel portion 24 passes through guide portion 136 while being in contact with the lower surface thereof in a state where it is folded back relative to left side portion 14.

[0080] The guide portion 137 in the front bottom plate bending portion 104 has an upstream guide portion 137-1 for bending the tip portion 20-2 relative to the main body portion 20-1 when the main body portion 20-1 is rotated by the arm portion of the arm unit 117, and a substantially plate-shaped downstream guide portion 137-2 for holding the main body portion 20-1 in a state where the main body portion 20-1 is folded back relative to the front side surface portion 10 and the tip portion 20-2 is folded back relative to the main body portion 20-1. The downstream guide portion 137-2 is connected downstream from the upstream guide portion 137-1. In other words, the blank 1 is transported while contacting the lower surface of the downstream guide 137-2 with the main body portion 20-1 and the tip portion 20-2 folded back.

[0081] The guide portion 138 in the rear bottom plate bending portion 108 has an upstream guide portion 138-1 for bending the tip portion 26-2 relative to the main body portion 26-1 when the main body portion 26-1 is rotated by the arm portion of the arm unit 118, and a substantially plate-shaped downstream guide portion 138-2 for holding the main body portion 26-1 in a state where the main body portion 26-1 is folded back relative to the rear side surface portion 16 and the tip portion 26-2 is folded back relative to the main body portion 26-1. The downstream guide portion 138-2 is connected to the upstream guide portion 138-1 downstream. In other words, the blank 1 is transported while contacting the lower surface of the downstream guide 138-2 with the main body portion 26-1 and the tip portion 26-2 folded back.

[0082] It should be noted that the configuration of the bottom surface bending section in the box making apparatus, except for the deformation section forming unit 120, is the same as that of a conventional box making apparatus.

[0083] The configuration for performing the bottom portion bending process in the box making apparatus is formed as described above. In this bottom portion bending process, the blank 1 is transported with the inner surface facing up and the bottom portion 7 side at the front (see Figure 5(a)). At the front bottom panel bending section 104, the arm portion of the arm unit 117 rotates the main body portion 20-1 so that the main body portion 20-1 is folded back against the front side portion 10, and at the timing when the main body portion 20-1 rotates, the tip portion 20-2 is folded back against the main body portion 20-1. At the rear bottom panel bending section 108, the arm portion of the arm unit 118 rotates the main body portion 26-1 so that the main body portion 26-1 is folded back against the rear side portion 16, and at the timing when the main body portion 26-1 rotates, the tip portion 26-2 is folded back against the main body portion 26-1 (see Figure 5(b)).

[0084] At the bottom panel bending portion, the right bottom panel portion 22 and the left bottom panel portion 24 then rotate at the right bottom panel portion bending portion 102 and the left bottom panel portion bending portion 106. That is, the right bottom panel portion 22 rotates by the arm portion 112 of the arm unit 110, and the left bottom panel portion 24 rotates by the arm portion of the arm unit 116 (see FIG. 6(c)).

[0085] For example, with respect to the right bottom panel portion 22, when the blank 1 is transported with the tip of the right bottom panel portion 22 hooked by the arm portion 112 (see Figure 7 (a)), the arm portion 112 rotates while hooking the right bottom panel portion 22, the tip side of the right bottom panel portion 22 is pulled up, and the right bottom panel portion 22 rotates.

[0086] Then, at the timing when the right bottom panel portion 22 rotates and tilts, the right bottom panel portion 22 comes into contact with the tip portion 122a of the deformation portion forming portion 122 and is pushed by the tip portion 122a (see FIG. 7(b)), so that the area including the line 22k is formed in a concave shape when viewed from the surface that becomes the inside of the box body, forming the deformation portion W centered on the line 22k, as shown in FIG. 8. In other words, the area including the line 22k becomes the deformation portion W.

[0087] Then, as shown in Figures 7(c) to 7(d), the right bottom panel portion 22 is folded back onto the right side portion 12, and the left bottom panel portion 24 is folded back onto the left side portion 14, and then, as the blank 1 passes through guide portions 130, 136, the right bottom panel portion 22 and the left bottom panel portion 24 are sufficiently folded back onto the side portion 5, as shown in Figure 6(d).

[0088] As shown in Figure 6 (c), an approximately plate-shaped guide portion 139 is provided at the upper position of the front bottom panel portion 20 for maintaining the folded state of the front bottom panel portion 20, and an approximately plate-shaped guide portion 140 is provided at the upper position of the rear bottom panel portion 26 for maintaining the folded state of the rear bottom panel portion 26.

[0089] As described above, in the bottom portion folding process, the rear bottom panel portion 26 is folded against the rear side portion 16 while the tip portion 26-2 is folded against the main body portion 26-1, the front bottom panel portion 20 is folded against the front side portion 10 while the tip portion 20-2 is folded against the main body portion 20-1, the left bottom panel portion 24 is folded against the left side portion 14, and the right bottom panel portion 22 is folded against the right side portion 12, and the bottom portion folding process results in the blank 1 being in the state shown in Figure 6(d).

[0090] The bottom portion bending step is the same as the conventional one, except that the deformed portion W is formed by the deformed portion forming unit 120. Note that the configuration of the box making device is omitted in Figures 6(d) and (e).

[0091] Although the above-mentioned folding lines are provided on the blank 1 immediately before the bottom portion folding step is performed, no part of the blank 1 is folded across the lines.

[0092] In the bottom portion bending process, the right bottom panel portion 22 and the left bottom panel portion 24 are bent after the front bottom panel portion 20 and the rear bottom panel portion 26 are bent (i.e., the bottom portion bending process includes a first process in which the rear bottom panel portion 26 is bent and the tip portion 26-2 is bent, and the front bottom panel portion 20 is bent and the tip portion 20-2 is bent, and a second process following the first process in which the right bottom panel portion 22 and the left bottom panel portion 24 are bent). ), however, the bending of the right bottom panel portion 22 and the left bottom panel portion 24 may be performed before the folding of the front bottom panel portion 20 and the rear bottom panel portion 26, and the bending of the right bottom panel portion 22, the folding of the left bottom panel portion 24, the folding of the front bottom panel portion 20, and the folding of the rear bottom panel portion 26 may be performed at the same timing, and as a result, the timing of the folding of the right bottom panel portion 22, the folding of the left bottom panel portion 24, the folding of the front bottom panel portion 20, and the folding of the rear bottom panel portion 26 is arbitrary.

[0093] Next, in the step following the bottom portion bending step, adhesive is applied to the glue tab 18, and adhesive is also applied to the right bottom panel portion 22 and the left bottom panel portion 24 (adhesive application step (S12)). Specifically, adhesive is applied to the outer surface of the glue tab 18 (the back surface in FIG. 6(d)), and then adhesive is applied to the outer surfaces of the right bottom panel portion 22 and the left bottom panel portion 24 (the front surfaces in FIG. 6(d)).

[0094] The configuration for performing the adhesive application process in the box making device includes a conveying means for conveying the blank 1 (specifically, a conveying belt (not shown)), a ring-shaped member (not shown) for applying adhesive to the glue tab 18, and a spraying device (not shown) for spraying and applying adhesive to the right bottom plate 22 and the left bottom plate 24. The ring-shaped member is provided below the passing blank 1 and is rotatable about an axis perpendicular to the conveying direction, and adhesive is applied to the glue tab 18 as the glue tab 18 passes over the ring-shaped member on whose surface the adhesive is applied. When applying adhesive to the glue tab 18, the adhesive is applied to almost the entire surface of the glue tab 18, but is not usually applied to the area close to the fold line C1.

[0095] In addition, when applying adhesive to the right bottom panel portion 22, the adhesive is applied to the area of ​​the right bottom panel portion 22 where the tip portion 20-2 will be bonded, and when applying adhesive to the left bottom panel portion 24, the adhesive is applied to the area of ​​the left bottom panel portion 24 where the tip portion 26-2 will be bonded.

[0096] It can be said that the configuration for performing the adhesive application step in the box making device is provided in a conventional box making device, and this adhesive application step is the same as the adhesive application step in the conventional box making method.

[0097] Alternatively, the adhesive may be applied to the tip portion 20-2 instead of the right bottom plate portion 22, and the adhesive may be applied to the tip portion 26-2 instead of the left bottom plate portion 24.

[0098] Next, in the next step of the adhesive application process, the right side portion 12 is folded toward the front side portion 10, and the rear side portion 16 is folded toward the left side portion 14, thereby adhering the glue tab portion 18 to the right side portion 12, adhering the left bottom panel portion 24 to the tip portion 26-2, and adhering the right bottom panel portion 22 to the tip portion 20-2 (adhering process (which may also be a side portion folding process) (S13)).

[0099] The configuration for performing the bonding process in the box-making equipment involves rotating the right side portion 12 and the rear side portion 16 using a conveyor belt (not shown) that is inclined relative to the conveying direction, folding the right side portion 12 back over the front side portion 10 so that the right bottom panel portion 22 is bonded to the tip portion 20-2, and folding the rear side portion 16 back over the left side portion 14 so that the tip portion 26-2 is bonded to the left bottom panel portion 24 and the glue tab portion 18 is bonded to the inner surface of the right side portion 12 (see Figure 6(e)).

[0100] It should be noted that the configuration for performing the bonding step in the box making device can be said to be provided in a conventional box making device, and this bonding step is the same as the bonding step in the conventional box making method.

[0101] Just before the adhesive portion 18 is adhered to the inner surface of the right side portion 12, as shown in Figures 9 to 11, the adhesive portion 18 is in a state just before entering the inside of the right side portion 12, but since a deformation portion W is formed in the right bottom panel portion 22, it becomes easier for the adhesive portion 18 to enter the inside of the right side portion 12.

[0102] That is, in the adhesive portion 18, the lower side 18a is formed in a substantially arc shape, and when the adhesive portion 18 is adhered to the right side surface portion 12, the adhesive portion 18 overlaps with the right bottom surface plate portion 22 (see FIG. 17). Therefore, in order to adhere the adhesive portion 18 to the inside surface of the right side surface portion 12, it is necessary to insert the area along the lower side 18a of the adhesive portion 18 between the right side surface portion 12 and the right bottom surface plate portion 22. However, since the deformed portion W is formed in the right bottom surface plate portion 22, the adhesive portion 18 overlaps with the right bottom surface plate portion 22 (see FIG. 17). The gap between the side portion 12 and the right bottom panel portion 22 (specifically, the gap between the area along the lower edge 18a of the adhesive portion 18 on the right bottom panel portion 22 corresponding to the area (i.e., the area including the area that overlaps with the area along the lower edge 18a when the adhesive portion 18 is adhered to the inner surface of the right side portion 12) and the right side portion 12) is widened, making it easy to insert the adhesive portion 18 (especially the area along the lower edge 18a) into the gap between the right side portion 12 and the right bottom panel portion 22.

[0103] In particular, since the blank 1 has lines formed by pressing from the inside surface of the box body, the right bottom panel 22 is more likely to bend relative to the right side panel 12 and the gap between the right side panel 12 and the right bottom panel 22 tends to narrower than when lines are pressed from the outside surface of the box body, and therefore widening the gap with the deformation portion W makes it easier to insert the glue tab 18 into the gap between the right side panel 12 and the right bottom panel 22. In other words, it can be said that the effect of widening the gap with the deformation portion W is greater when lines are formed by pressing from the inside surface of the box body than when lines are formed by pressing from the outside surface of the box body.

[0104] This eliminates the need to precisely adjust the timing for folding the right side surface portion 12 and the rear side surface portion 16, and allows the adhesive margin portion 18 to be easily adhered.

[0105] In other words, as shown in Figure 16, in the case of a blank for a box body having a one-touch bottom, in which the bottom edge 318'a of the glue tab 318' is formed in an approximately arc shape, the structure for folding the right side portion 312 and the rear side portion 316 in the bonding process (e.g., a conveying belt) must be precisely configured and the timing for folding the right side portion 312 and the rear side portion 16 must be precisely adjusted; particularly in the case of lines formed by pressing from the inside face of the box body, more precise adjustment is required; however, in this embodiment, as described above, precise adjustment is not necessary.

[0106] In the manufacturing method of a box body using the above-mentioned blank 1, the bottom portion folding process is the same as conventional except for the formation of the deformed portion W, and the adhesive application process and the bonding process are the same as conventional, so as a result, it can be said that the method is the same as conventional except for the formation of the deformed portion W.

[0107] In the above description, the right side portion 12 as the fourth side portion constitutes the right side of the side portion 5, and the left side portion 14 as the second side portion constitutes the left side of the side portion 5. However, the blank 1 may be configured symmetrically, with the right side portion 12 as the fourth side portion constitutes the left side of the side portion 5, and the left side portion 14 as the second side portion constitutes the right side of the side portion 5. In other words, the fourth side portion constitutes the left side of the side portion 5, and the second side portion constitutes the right side of the side portion 5. Even in this case, the creases provided on the blank 1 are formed by pressing from the inner surface side of the box body, but may be formed by pressing from the outer surface side of the box body. [Explanation of symbols]

[0108] 1 Blank 5 Side part 7 Bottom part 10 Front side 11, 13, 15, 17, 20a, 26a Broken line 12 Right side part 14 Left side part 16 Posterior side part 18 Glue section 18a Bottom 20 Front bottom plate 22a, 22b, 22c, 22d, 22e, 24a, 24b, 24c, 24d Side part 20b, 26b Notch 20-1 Main body 20-2 Tip 22 Right bottom plate 22k Ruled 24 Left bottom plate 26 Rear bottom plate 26-1 Main body 26-2 Tip 30 Right flap part 32 Left flap 40 Lid 42 Lid body 44 Tip 102 Right bottom panel bend 104 Front bottom panel bend 106 Left bottom panel bend 108 Rear bottom panel bend 110, 116, 117, 118 Arm Unit 112 Arm section 112a Arm body 112b Latch part 114 Support part 120 Deformation section forming unit 122 Deformation section forming section 122-1 Rod-shaped part 122a Tip 124 Support part 130, 136, 137, 138, 139, 140 Guide section 132 Guide body 132a Slope 132b Horizontal part 134 Support part 201, 301, 301' Blank 205, 305 Side part 210, 310 Front side part 212, 312 Right side part 214, 314 Left side part 216, 316 Posterior side part 218, 318, 318' Glue section 218a, 318a, 318'a bottom 220, 320 Front bottom plate 220-1, 226-1, 320-1, 320-2 Main unit 220-2, 226-2, 320-2, 326-2 Tip 222, 322 Right bottom plate 222a, 322a edge 224, 324 Left bottom plate 226, 326 Rear bottom plate 230, 330 Right flap 232, 332 Left flap 240, 340 Lid 242, 342 Lid body 244, 344 Tip C1, C2, C3, C4 Line J contact P intersection Q Virtual line S end W Deformation part U recess V convex part

Claims

1. A method for manufacturing a box having a one-touch bottom, comprising the steps of: A blank for a box body has a side portion (5) and a bottom portion (7) connected to the lower edge of the side portion, the side portion having a glue tab (18), a first side portion (16), a second side portion (14), a third side portion (10), and a fourth side portion (12), and the glue tab, the first side portion, the second side portion, the third side portion, and the fourth side portion are connected in this order via a fold line, and the bottom portion has a first bottom panel portion (26) connected to the first side portion via the fold line, a second bottom panel portion (24) connected to the second side portion via the fold line, a third bottom panel portion (20) connected to the third side portion via the fold line, and a fourth side portion (12). The adhesive portion (18) has a fourth bottom panel portion (22) connected to the upper end of the adhesive portion (18) via a fold line, and the adhesive portion (18) has a substantially arc-shaped lower side (18a) and a side side (18b) connected to the upper end of the substantially arc-shaped lower side and substantially parallel to a first fold line (C1) which is a fold line between the adhesive portion and the first side surface portion, and the region along the lower side of the adhesive portion is a virtual straight line which forms an angle of approximately 45 degrees upward with respect to the first straight line from an intersection (P) of a first straight line which is the first fold line or an extension (C1') of the first fold line and a second straight line which is the second fold line (17) which is a fold line between the first side surface portion and the first bottom panel portion or an extension (17') of the second fold line. (Q), the first bottom panel portion has a first main body portion (26-1) connected to the first side surface portion via a fold line and a first tip portion (26-2) connected to the first main body portion via a fold line, the third bottom panel portion has a second main body portion (20-1) connected to the third side surface portion via a fold line and a second tip portion (20-2) connected to the second main body portion via a fold line, and the fourth bottom panel portion is a side portion on the opposite side to the third bottom panel portion side of the fourth bottom panel portion and forms an angle of approximately 45 degrees with the third fold line (13), which is a fold line between the fourth side surface portion and the fourth bottom panel portion. a fourth bottom panel portion having an inclined side (22a), a deformation portion forming crease (22k) extending from the inclined side and substantially parallel to the third fold line, the deformation portion forming crease being formed by pressing from a surface that will become the inside of the box body, a length (L1) from a contact point (J) of the deformation portion forming crease and the inclined piece to the third fold line being shorter than a length (L2) from an end (S) on the side side of the lower side of the glue tab portion to an extension of the second fold line, and a crease being formed along the third fold line, the crease being formed along the third fold line by pressing from a surface that will become the inside of the box body;a bottom portion bending process for bending the first bottom panel portion against the first side portion and folding the first tip portion against the first main body portion, bending the third bottom panel portion against the third side portion and folding the second tip portion against the second main body portion, folding the second bottom panel portion against the second side portion, and folding the fourth bottom panel portion against the fourth side portion, the bottom portion bending process including a bottom portion bending step for forming a deformed portion (W) by making an area of ​​the fourth bottom panel portion including the line for forming the deformed portion concave as viewed from the inner surface of the box body at any time during a period from the start to the end of bending the fourth bottom panel portion against the fourth side portion; an adhesive application step of applying an adhesive to an outer surface of the overlap portion and also to either the second bottom plate portion or the first tip portion and either the fourth bottom plate portion or the second tip portion; a bonding process of folding the first side surface portion relative to the second side surface portion and folding the fourth side surface portion relative to the third side surface portion to bond a glue tab portion to an inner surface of the fourth side surface portion, bonding the second bottom surface plate portion to the first tip portion, and bonding the fourth bottom surface plate portion to the second tip portion; having A method for manufacturing a box body, characterized in that in the bottom portion bending process, the blank is transported by a transporting means with the bottom portion side at the front and the surface that will become the inside of the box body at the top, and the blank is transported with the tip of the fourth bottom panel portion of the transported blank hooked by an arm portion that is freely rotatable, so that the arm portion rotates upward with the tip of the fourth bottom panel portion hooked, and the tip side of the fourth bottom panel portion is pulled up, and a deformation portion forming section is fixedly provided above the transport path of the blank transported by the transporting means, and a downstream tip portion (122a) of the rod-shaped portion in the deformation portion forming section (122) having a rod-shaped portion (122-1) on the downstream side in the transport direction of the blank is brought into contact with an area including the deformation portion forming ruled line of the fourth bottom panel portion in a state in which the tip side of the fourth bottom panel portion is pulled up, thereby rotating the fourth bottom panel portion relative to the fourth side portion, thereby forming a deformation portion.

2. A method for manufacturing a box body as described in claim 1, characterized in that in the blank, the length (L3) from the end portion opposite the inclined side side of the deformation portion forming rule to the extension line of the edge portion (D) opposite the third side portion side of the fourth side portion is approximately the same as the length (L4) from the end portion (S) on the side side of the lower side of the glue portion to the first fold line.

3. A method for manufacturing a box body as described in claim 1 or 2, characterized in that the length (L1) from the tangent point (J) of the deformation portion forming rule and the inclined piece to the third fold line is approximately half the length (L2) from the end (S) on the side edge of the lower side of the glue portion to the extension line of the second fold line.

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