Box blank sheet and its manufacturing method

Abstract

To provide a blank sheet of a box capable of assembling a box equivalent to the case where V-groove formation is performed without V-groove formation, and a manufacturing method of the same.SOLUTION: A blank sheet (S) of a box (10) has: a polygonal bottom plate part (11); rectangular side plate parts (12) adjacent to respective sides of the bottom plate part (11); a plurality of line segment-shaped first cutout parts (1) formed inside the assembled box (10) at a predetermined interval on a first finishing line (L) which is a boundary line between the bottom plate part (11) and the side plate parts (12; and a plurality of line segment-shaped second cutout parts (2) formed at a predetermined interval on a second finishing line (M) separated from the first finishing line (L) toward the side plate parts (12) by the same distance (d1) as a thickness (t) of the blank sheet (S). Each of the first cutout parts (1) and each of the second cutout parts (2) are arranged staggered in the directions of the first and second finishing lines (L, M).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a box blank sheet and a method for manufacturing the same. [Background technology]

[0002] A pasted box is a type of paper container that is made by preparing blank sheets from paperboard such as chipboard, assembling the blank sheets into a box shape to form a core box, and pasting a sticker such as decorative paper onto the core box.

[0003] A conventional method for manufacturing a rectangular pasted box will be described with reference to Figs. 13 and 14. Fig. 13(a) is a plan view of a rectangular paperboard C cut out to produce a conventional blank sheet. The paperboard C has one rectangular bottom plate portion 110, four rectangular side plate portions 120 arranged adjacent to each side of the bottom plate portion 110, and four corner portions 130. First, a V-groove processing machine is used to process the paperboard C to form a V-groove 140. The V-groove 140 is formed on the boundary line between the portions 110, 120, and 130. Fig. 13(b) is a schematic diagram of a cross section II of Fig. 13(a). As an example, the paperboard C has a two-layer structure consisting of a thin outer paper a that forms the outer surface of the core box, and a thick inner paper b that forms the inner surface and essentially constitutes the paperboard C. The V-groove 140 is carved only in the inner paper b, leaving the outer paper a, and the groove walls on both sides have an inclination of about 45° with respect to the vertical direction. Two passes through the V-groove machine are usually required to form one V-groove 140. Then, the blank sheet S is produced by cutting out the four corners 130 with a punching machine, as shown in FIG. 13(c).

[0004] FIG. 14(a) shows the process of assembling the core box 100 from the blank sheet S of FIG. 13(c). With the V-groove 140 facing inward, each side plate portion 120 is folded at a right angle to the bottom plate portion 110. Then, adjacent side plate portions 120 are fixed to each other with tape or the like. When all the side wall portions 120 are fixed, the core box 100 shown in FIG. 14(b) is completed. Then, as shown in FIG. 14(b), a sticker D is attached to the outside of the core box 100, thereby completing the pasted box 200 as shown in FIG. 14(c). The pasted box 200 is a box that opens upward. It is common to make both the body box and the lid box from pasted boxes and use them in combination.

[0005] It is well known to form such a V-groove in a portion of a paper container that is to be folded at a right angle, and is disclosed in Patent Documents 1 to 3, for example. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 53-5220 [Patent Document 2] Japanese Utility Model Application Publication No. 61-110518 [Patent Document 3] Utility Model Registration No. 3197625 Summary of the Invention [Problem to be solved by the invention]

[0007] The above-mentioned method for manufacturing a box including forming a V-groove has the following problems. -Since the V groove is engraved, paper dust is generated (dust disposal problem). The V-shaped cutting edge of the V-groove cutting machine wears out, so it needs to be sharpened frequently (maintenance issue). In addition to the punching machine for punching out the blank sheets, a V-groove machine is required, which is expensive (problems of installation space and machine cost). - To form one V-groove, the work must be passed through the V-groove processing machine twice (work load issue).

[0008] In order to solve the above problems, the object of the present invention is to provide a box blank sheet and a manufacturing method thereof that can be used to assemble a box in which the side wall portion is folded at right angles to the bottom wall portion without forming a V-groove, in the same manner as when a V-groove is formed. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention has the following configuration: Note that the numbers in parentheses are symbols in the drawings described later, and are added for reference.

[0010] According to an embodiment of the present invention, there is provided a blank sheet (S) for a box (10) having a polygonal bottom plate portion (11) and rectangular side plate portions (12) disposed adjacent to each side of the bottom plate portion (11), a plurality of first cutouts (1) in the form of linear segments cut across the entire thickness of the blank sheet (S) at predetermined intervals on a first finish line (L) that is the boundary between the bottom plate portion (11) and the side plate portion (12) on the inside of the assembled box (10); a plurality of second cutout portions (2) in the form of linear segments cut at predetermined intervals across the entire thickness of the blank sheet (S) on a second finish line (M) spaced from the first finish line (L) toward the side plate portion (12) by a distance (d1) equal to the thickness (t) of the blank sheet (S); Each of the first cutout portions (1) and each of the second cutout portions (2) are arranged alternately in the direction of the first and second finish lines (L, M). And, When viewed from a direction perpendicular to the extending direction of the first and second cutouts (1, 2) on the surface of the blank sheet (S), the vicinity of each end point (1a, 1b) of the first cutout (1) and the vicinity of each end point (2b, 2a) of the second cutout (2) overlap by a predetermined length (d2). It is characterized by: · In the above aspect, the overlapping length (d2) is the same as the thickness (t) of the blank sheet (S). A method for producing a blank sheet according to any one of the above aspects, comprising the steps of: The method includes a punching process for punching out at least a portion of the contour line of the blank sheet (S), and is characterized in that the first cutout portion (1) and the second cutout portion (2) are punched out simultaneously in the punching process. In yet another aspect of the present invention, there is provided a box assembled by folding the side plate portions (12) of the blank sheet (S) of any of the above aspects at right angles to the bottom plate portion (11) and fixing the adjacent side plate portions (12) together. The box (10) is also characterized in that it is a core box for pasting boxes. Yet another aspect of the present invention is a pasted box comprising the box (10) and a sticker pasted on the box (10). Yet another aspect of the present invention is a method for manufacturing a pasted box, comprising assembling a box (10) using a blank sheet produced by any of the above-described methods for manufacturing a blank sheet, and attaching a sticker to the assembled box (10) to obtain a pasted box. Effect of the Invention

[0011] According to the box blank sheet of the present invention, it is possible to assemble a box in which the side plate parts are bent at right angles to the bottom plate part without forming a V groove, with the same quality as when a V groove is formed. Therefore, it is possible to solve the above-mentioned problems (dust disposal, maintenance, installation space and machine costs, and labor burden) when forming a V groove. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a plan view of a blank sheet for a box according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of the upper right portion of FIG. [Diagram 3] Figures 3(a) and (b) are schematic diagrams showing the AA and BB cross sections of Figure 2. Figures 3(a1)(a2) and Figures 3(b1)(b2) are schematic diagrams showing the changes in the AA and BB cross sections, respectively, when a box is assembled from a blank sheet. [Figure 4]FIG. 4 shows a perspective view of a box in the first embodiment assembled from the blank sheet of FIG. [Diagram 5] FIG. 5 is an enlarged plan view similar to FIG. 2, showing a blank sheet according to a second embodiment of the present invention. [Figure 6] FIG. 6 shows a perspective view of the box in the second embodiment. [Figure 7] FIG. 7(a) is a flow diagram showing an outline of an example of a method for manufacturing a pasted box using the blank sheet according to the present invention described above, and (b) is a flow diagram of the prior art shown in FIG. 13 and FIG. 14 for comparison. [Figure 8] FIG. 8(a) is a plan view of a blank sheet for a box according to a third embodiment of the present invention, and (b) is a schematic view of the CC cross section of (a). [Figure 9] Figure 9(a) is a diagram for explaining a method of assembling a core box 10 from the blank sheet S shown in Figure 8, (b) is a DD cross-sectional view of (a), (c) is an EE cross-sectional view of (a), and (d) is a diagram showing the state during bending before reaching the final form of (c). [Figure 10] FIG. 10(a) is a plan view of the outer paper material sheet, and (b) is an FF cross-sectional view of (a). [Figure 11] FIG. 11(a) is a plan view showing the lamination process, and (b) is a cross-sectional view taken along line GG of (a). [Figure 12] FIG. 12(a) is a plan view showing the next punching step, and (b) is a schematic diagram showing the HH cross section of (a). [Figure 13] FIG. 13(a) is a plan view of a rectangular paperboard cut out to produce a conventional blank sheet, and (b) is a schematic view of a cross section taken along line II of (a). [Figure 14] 14(a), (b) and (c) show the process of producing a pasted box from the blank sheet S of FIG. 13(c). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings showing examples. In the embodiments, the same or similar components are denoted by the same reference numerals.

[0014] The box blank sheet according to the present invention is preferably applied as a blank sheet for a core box of a pasted box. Therefore, the following description will be given using a blank sheet for a core box of a pasted box as an example. However, the present invention is not limited to pasted boxes, and can also be applied to boxes that are used without pasting a label on the outside, as in Patent Documents 1 and 2. The present invention can also be applied to both body boxes and lid boxes.

[0015] FIG. 1 is a plan view of a blank sheet S for a box according to a first embodiment of the present invention. FIG. 2 is an enlarged view of the upper right portion of the blank sheet S in FIG. 1. The blank sheet S is produced by, for example, punching a paperboard such as chipboard having a predetermined thickness to a predetermined contour shape. The thickness of the paperboard for the core box of the pasted box is, for example, about 1 mm to about 3 mm, and is appropriately selected according to the desired size and strength of the box. The blank sheet S in FIG. 1 is for assembling a rectangular box. Therefore, the blank sheet S is composed of one rectangular bottom plate portion 11 and four rectangular side plate portions 12 arranged adjacent to each side of the bottom plate portion 11. The four corner portions 13 shown by dotted lines have already been cut off in the punching process.

[0016] It should be noted that the box assembled from the blank sheet S according to the present invention is not limited to a rectangular parallelepiped. In the case of a box having a polygonal prism shape other than a rectangular parallelepiped, the shape of the bottom plate portion 11 of the blank sheet S is a polygon such as a triangle, a pentagon, a hexagon, or an octagon. In this case, the side plate portions 12 are rectangular and disposed adjacent to each side of the polygon of the bottom plate portion 11.

[0017] In the blank sheet S of the present invention, a plurality of first cutouts 1 and a plurality of second cutouts 2 are formed in the entire boundary area between the bottom plate portion 11 and the side plate portion 12 (shown by thick lines). The first cutouts 1 and the second cutouts 2 are arranged so as to extend on two parallel imaginary lines spaced apart at a predetermined interval (described later in detail in FIG. 2). The first and second cutouts 1 and 2 have a predetermined length in the surface direction of the blank sheet S and are cut through the entire thickness of the blank sheet S. That is, the bottom plate portion 11 and the side wall portion 12 are separated from each other at the portions of the first and second cutouts 1 and 2. Furthermore, each of the first cutouts 1 and each of the second cutouts 2 are arranged alternately along the sides of the bottom plate portion 11. Between the first cutout portion 1 and the second cutout portion 2, a connecting portion 3 that connects the bottom plate portion 11 and the side wall portion 12 is left.

[0018] In FIG. 1, the first cutouts 1 are arranged three by three along the long side of the bottom plate portion 11 and two by two along the short side, and the second cutouts 2 are arranged four by four along the long side of the bottom plate portion 11 and three by three along the short side. However, this is only an example, and the length of each cutout 1, 2, the interval between adjacent cutouts 1, 2 in the extension direction, and the number of cutouts 1, 2 arranged on one side are appropriately set according to the length of the side of the bottom plate portion 11. For example, the long side of the bottom plate portion 11 is 126 mm, the short side is 90 mm, and the length of the first and second cutouts 1, 2 is 18 mm. In the illustrated example, the first cutout 1 and the second cutout 2 are the same length, and the intervals between adjacent cutouts 1, 2 in the extension direction are all the same, but they do not have to be the same.

[0019] These linear first and second cutouts 1, 2 can be formed by punching out at least a part of the contour of the blank sheet S at the same time in a punching process. For example, in the process of cutting out the corner 13, the cutting out of the corner 13 and the formation of the cutouts 1, 2 can be performed simultaneously using the same punching die. For example, punching can be performed with a straight blade of a predetermined length.

[0020] With reference to FIG. 2, the first cutout portion 1, the second cutout portion 2 and the connecting portion 3 will be described in more detail.

[0021] A plurality of first cutouts 1, each having a predetermined length, are formed at predetermined intervals on a first finish line L indicated by a dashed line. The first finish line L is an imaginary line for explanation purposes, and is a straight line that becomes the boundary line between the bottom plate portion 11 and the side plate portion 12 on the inside of the box when the box is assembled from the blank sheet S.

[0022] A plurality of second cutouts 2, each having a predetermined length, are formed at predetermined intervals on a second finish line M shown by a dashed line. The second finish line M is also an imaginary line for the purpose of explanation, and is a straight line spaced a distance d1 from the first finish line L toward the side plate portion 12. This distance d1 is the same as the thickness of the blank sheet S. Thus, the first finish line L and the second finish line M extend parallel to each other.

[0023] The first cutouts 1 and the second cutouts 2 are arranged alternately, one by one, in the directions of the first and second finish lines L, M. In other words, the first cutouts 1 and the second cutouts 2 are not arranged in parallel, but are arranged alternately with a shift of approximately the entire length of each cutout 1, 2 in the extension direction.

[0024] The first cutout portion 1 has end points 1a and 1b at both ends, and the second cutout portion 2 has end points 2a and 2b at both ends. In the first embodiment, when viewed from a direction perpendicular to the extending direction of the first and second cutout portions 1 and 2 on the surface of the blank sheet S (the direction of the arrow X), the end points 1a and 1b of the first cutout portion and the end points 2b and 2a of the second cutout portion are at the same position. For example, when viewed from the X direction, the end point 1a of the first cutout portion 1 and the end point 2b of the second cutout portion 2 are at the same position, and the end point 1b of the first cutout portion and the end point 2a of the second cutout portion are at the same position. The area between the end points at the same position becomes the connecting portion 3. The line segment connecting the end point 1a (or 1b) and the end point 2b (or 2a) in the connecting portion 3 is perpendicular to the extending direction of the cutout portions 1 and 2. The actual connecting portion 3 also includes a portion that is connected in the thickness direction of the blank sheet S.

[0025] Figures 3(a) and (b) are schematic diagrams showing cross sections AA and BB, respectively, of Figure 2. For reference, the positions of the first finish line L, the second finish line M, and the connecting portion 3 (dotted lines) are also shown.

[0026] In the AA cross section of Fig. 3(a), the bottom plate portion 11 is continuous at the position of the first finishing line L, and the second cutout portion 2 is present at the position of the second finishing line M. As shown in the figure, the distance d1 between the lines L and M is the same as the thickness t of the blank sheet. On the other hand, in the BB cross section of Fig. 3(b), the first cutout portion 1 is present at the position of the first finishing line L, and the side plate portion 12 is continuous at the position of the second finishing line M.

[0027] 3(a1)(a2) and 3(b1)(b2) are diagrams showing schematic changes in the AA and BB cross sections when a box is assembled from the blank sheet S in FIG. 1. When assembling a box from the blank sheet S, the side plate portion 12 is folded at a right angle to the bottom plate portion 11. At this time, if the blank sheet S does not have a front and back, it may be folded in either direction. As another example, if one side of the blank sheet S is a paperboard surface with thin white paper attached and the other side is the surface of the paperboard itself (e.g., gray), the side plate portion 12 is folded toward the side with the white paper attached. As a result, the inside of the assembled box will be white.

[0028] As shown in FIG. 3(a1), in the AA cross section, the side plate portion 12 rotates as indicated by the arrow r1. This rotational movement is performed around the connecting portions 3 located at both ends of the second cutout portion 2 as an axis. As a result, the bottom plate portion 11 and the side plate portion 12 are separated at the second cutout portion 2, and the end portion of the side plate portion 12 rotates around the connecting portion 3 as an axis as indicated by the arrow r2 and rides up onto the surface of the bottom plate portion 11. Finally, as shown in FIG. 3(a2), the side plate portion 12 rides on the end portion of the bottom plate portion 11. In this final form, the second finish line M is in the same position as the first finish line L.

[0029] Similarly, in the BB cross section, as shown in FIG. 3(b1), the side plate portion 12 rotates as indicated by the arrow r1. This rotational movement is performed around the connecting portions 3 located at both ends of the first cutout portion 1 as an axis. As a result, the bottom plate portion 11 and the side plate portion 12 are separated at the first cutout portion 1, and the end portion of the side plate portion 12 rotates around the connecting portion 3 as an axis as indicated by the arrow r3 and drops off from the surface of the bottom plate portion 11. Finally, as shown in FIG. 3(b2), the end portion of the side plate portion 12 abuts against the side surface of the bottom plate portion 11. In this final form, the second finish line M is in the same position as the first finish line L.

[0030] Comparing the cross sections of the final form in Figure 3(a2) and Figure 3(b2), the relative positions of the bottom plate portion 11 and the side plate portion 12 are different, but the positions and contour shapes of the right-angled vertices formed on the inner surface (inside of the box) and outer surface (outside of the box) are the same.

[0031] Fig. 4 shows a perspective view of the box 10 in the first embodiment assembled from the blank sheet S in Fig. 1. The box 10 is a rectangular box that opens upward. After the side plate portions 12 are folded at right angles as shown in Fig. 3, the upper ends of the adjacent side plate portions 12 are fixed together with tape 15 or the like.

[0032] Ideally, in the assembled box 10, there should be no gap at the position of the first cutout 1 and the second cutout 2, and it is preferable that they look like a single line. However, in reality, the first cutout 1 and the second cutout 2 tend to open slightly and form a gap (shown in Fig. 4 as an exaggerated bold line). In applications where such a gap is not a problem, it can be used sufficiently. The box 10 in Fig. 4 is used as a core box, and a pasted box is obtained by pasting a paper on the core box as shown in Fig. 14(b)(c) described above. Furthermore, a body box and a lid box are each formed from pasted boxes, and a box with a lid is obtained by combining them.

[0033] Fig. 5 is an enlarged plan view of a blank sheet S according to a second embodiment of the present invention, similar to Fig. 2. The second embodiment differs from the first embodiment in that the ends of the first cutout portions 1 and the second cutout portions 2, which are alternately arranged, overlap each other by a predetermined length d2.

[0034] That is, in the second embodiment, when viewed from a direction perpendicular to the extending direction of the first and second cutouts 1 and 2 on the surface of the blank sheet S (the direction of the arrow X), the vicinity of each end point 1a, 1b of the first cutout overlaps with the vicinity of each end point 2b, 2a of the second cutout by a length d2. For example, when viewed from the X direction, the vicinity of the end point 1a of the first cutout overlaps with the vicinity of the end point 2b of the second cutout overlaps with the vicinity of the end point 1b of the first cutout overlaps with the vicinity of the end point 2a of the second cutout. The rectangular area between the overlapping parts becomes the connecting part 3. In the second embodiment, the size of the connecting part 3 is larger than that of the first embodiment. In the rectangular connecting portion 3, the diagonal line connecting the end point 1a (or the end point 1b) and the end point 2b (or the end point 2a) is inclined with respect to the extending direction of the cutout portions 1 and 2. The actual connecting portion 3 also includes a portion that is connected in the thickness direction of the blank sheet S.

[0035] The overlapping length d2 is preferably equal to the thickness t of the blank sheet S. As another example, the length d2 may be in a range greater than zero and less than the thickness t. When the length d2 is zero, it is the same as the first embodiment.

[0036] Fig. 6 shows a perspective view of the box 10 in the second embodiment. The method of assembling the box 10 is as described with reference to Figs. 3(a1), (a2), (b1), and (b2).

[0037] In the second embodiment, the side plate portion 12 of FIG. 3(a1) rides up and the side plate portion 12 of FIG. 3(b1) falls down at the same time in the connecting portion 3. As a result, a tensile force acts on the connecting portion 3 to pull the bottom plate portion 11 and the side plate portion 12 along a diagonal line connecting the end point 1a (or 1b) of the first cutout portion and the end point 2b (or 2a) of the second cutout portion. As a result, no gap is generated at the positions of the first cutout portion 1 and the second cutout portion 2 in the assembled box 10, and they are seen as one line. Therefore, in the second embodiment, a bent portion with a good accuracy and an aesthetic appearance equivalent to that obtained when the V-groove formation of the conventional technology is performed can be obtained. Such a box 10 is suitable as a core box for a pasted box. A pasted box can be obtained by pasting a paper on the core box as shown in FIG. 14(b)(c) using the box 10 of FIG. 6 as the core box. Furthermore, a body box and a lid box are each formed from pasted boxes, and then combined to obtain a box with a lid.

[0038] Fig. 7(a) is a flow diagram that shows an outline of an example of a method for manufacturing a pasted box using the blank sheet S according to the present invention, and (b) is a flow diagram of the prior art shown in Fig. 13 and Fig. 14 for comparison. In the following, the symbols in the above-mentioned drawings will be used for explanation.

[0039] Here, the previous process up to preparing the paperboard having the contour shape including the corner portion 13 is omitted. In the present invention, in step S11, the blank sheet S is punched. In this punching process, the corner portion 13 can be cut out and the first and second cutout portions 1 and 2 can be cut out at the same time. The punching process includes both a case where the entire contour line of the blank sheet S is punched out and a case where only the corner portion 13 is required to be removed. In either case, the first and second cutout portions 1 and 2 can also be punched out in the punching process for punching out at least a part of the contour line of the blank sheet S. Therefore, the formation of the first and second cutout portions 1 and 2 can be performed in the punching process of the conventional manufacturing method without adding a new process to the conventional manufacturing method. In this case, the punching die is provided with a blade for punching out the contour line of the blank sheet S as well as a blade for punching out the first and second cutout portions 1 and 2.

[0040] Next, in step S12, the core box 10 is assembled. In this assembly process, the side plate portions 12 are folded at right angles to the bottom plate portion 11, and adjacent side plate portions 12 are fixed together with tape 15 or the like. After that, in step S13, a sticker is attached to the core box 10 to complete the pasted box. In the present invention, boxes can be manufactured with only a die-cutting machine in addition to a printing machine used in the previous process for applying positioning marks.

[0041] 7(b), a V-groove is formed before the punching process of cutting out the corner 130 from the blank sheet S. For this reason, an expensive V-groove processing machine is required in addition to the printing machine and punching machine.

[0042] A box blank sheet S and a manufacturing method thereof, as well as a box manufacturing method using the blank sheet S, according to a third embodiment of the present invention will be described with reference to Figs.

[0043] FIG. 8(a) is a plan view of a box blank sheet S according to a third embodiment of the present invention, and (b) is a schematic view of the CC cross section of (a).

[0044] The blank sheet S of the third embodiment is composed of one rectangular bottom plate portion 11 and four rectangular side plate portions 12 arranged adjacent to each side of the bottom plate portion 11, as in the above-mentioned embodiment. Four corner portions 13 indicated by dotted lines have already been cut off in the punching process. The bottom plate portion 11 may be polygonal. In the third embodiment, as shown in FIG. 8(b), the blank sheet S is formed by bonding an inner sheet Sb, which is a paperboard such as chipboard having a thickness t substantially the same as the thickness of the entire blank sheet S, and an outer sheet Sa, which is extremely thinner than the inner sheet Sb. In FIG. 8(b), the thickness of the outer sheet Sa is shown enlarged for ease of understanding, but the thickness of the outer sheet Sa is almost negligible in the overall thickness of the blank sheet S. In addition, in FIG. 8(b), the thickness of the layer of adhesive (e.g., glue) 17 that bonds the outer sheet Sa and the inner sheet Sb is also shown enlarged, but in reality, it is negligible in the overall thickness of the blank sheet S.

[0045] The thinner outer paper Sa is a single continuous sheet of paper. The outer paper Sa comprises an outer bottom plate portion 11a forming the bottom plate portion 11, and rectangular outer side plate portions 12a which are disposed adjacent to each side of the outer bottom plate portion 11a and form the side plate portions 12.

[0046] On the other hand, the thicker inner paper Sb is composed of multiple pieces of paperboard arranged separately from each other. The inner paper Sb includes an inner bottom plate portion 11b forming the bottom plate portion 11, and inner side plate portions 12b forming the side plate portions 12, each spaced a distance d3 from each side of the inner bottom plate portion 11b, which is the same as the thickness t of the inner paper Sb.

[0047] Therefore, as shown in the CC cross section of Figure 8(b), a groove 14 having a width of distance d3 is formed along the boundary between the bottom plate portion 11 and the side plate portion 12, and no inner paper Sb exists in this portion, which is connected only by the outer paper Sa. Along this boundary, a release varnish 16 is applied by printing to the outer paper Sa with a width greater than the distance d3 (i.e., the thickness t of the outer paper Sa). For ease of understanding, the thickness of the release varnish 16 is shown enlarged in Figure 8(b), but in reality it is negligible in the overall thickness of the blank sheet S.

[0048] Fig. 9(a) is a diagram for explaining a method of assembling a box 10, for example a core box for a pasted box, from the blank sheet S shown in Fig. 8. The finished box 10 will be a rectangular parallelepiped similar to those shown in Fig. 4 and Fig. 6 above, but for the sake of explanation, Fig. 9(a) shows a state in which the left side panel 12 has not yet been folded.

[0049] Fig. 9(b) shows a schematic DD cross section of (a). This is similar to Fig. 8(b), but the adhesive layer and the layer of release varnish are omitted. Fig. 9(c) shows a schematic EE cross section of (a). The side plate portion 12 is bent at a right angle to the bottom plate portion 11. In this final form, the inner side plate portion 12b rests on the end of the inner bottom plate portion 11b.

[0050] 9(d) is a diagram showing a state during folding before the final shape of (c) is obtained. As shown by the arrow r2, the inner side plate portion 12b rotates around the edge of the inner bottom plate portion 11b as an axis, and the inner side plate portion 12b rides on the end of the inner bottom plate portion 11b. If the box 10 is a core box for a pasted box, a pasted box can be obtained by pasting a paper on the core box, as in the above-mentioned embodiment.

[0051] A method for producing the blank sheet S of the third embodiment shown in FIG. 8 will be described with reference to FIGS.

[0052] Fig. 10(a) is a plan view of the material sheet (card paper, etc.) of the outer paper Sa, and (b) is a schematic diagram of the FF cross section of (a). At this stage, the outer paper Sa still includes the corner portion 13a. In practice, a material sheet of a larger area is prepared and punched out in the punching process described below so as to have the contour line shown in Fig. 8, but here only the parts related to the main part of the present invention will be briefly described. At this stage, the inner paper Sb has not yet been attached.

[0053] First, as shown in Figure 10(a), in the release varnish printing process, release varnish 16 is printed on the outer paper Sa along the boundary line (shown by dotted line P in Figure 10(a)) between the outer bottom plate portion 11a and the outer side plate portion 12a with a width greater than the thickness t of the inner paper Sb. If the release varnish is printed repeatedly, for example, two or more times, on the same location of the outer paper Sa, even if the inner paper Sb is attached on top of it with an adhesive, it will not adhere and interlayer delamination will occur at that location. Note that the thicknesses of the outer paper Sa and the release varnish 16 are exaggerated.

[0054] 11(a) is a plan view showing the next lamination step, and (b) is a schematic diagram showing the GG cross section of (a). In the lamination step, adhesive 17 such as glue is applied to the entire surface of the outer paper Sa on which the release varnish 16 is printed, and the cardboard of the inner paper Sb is laminated. At this point, the inner paper Sb still includes the corners 13b. Note that the thicknesses of the outer paper Sa, release varnish 16, and adhesive 17 are exaggerated.

[0055] FIG. 12(a) is a plan view showing the next punching step, and (b) is a schematic diagram showing the (a) HH cross section. In the punching step, only the inner paper Sb is punched out on the release varnish 16, leaving the outer paper Sa. The inner paper Sb is punched out so as to form two cut lines 18. The two cut lines 18 are parallel lines spaced apart by a predetermined distance, and the distance d3 is the same as the thickness t of the inner paper Sb. The inner cut line of the two cut lines 18 is located on the boundary line between the outer bottom plate portion 11a and the outer side plate portion 12a, which are shown by the dotted line P in FIG. 10(a).

[0056] In this punching process, the corners 13 are also punched out and removed at the same time, and other contour lines are also formed by punching.

[0057] Finally, in the groove forming step, the inner surface paper Sb between the two cut lines 18 is removed to form the groove 14 shown in FIG. 8(b) described above.

[0058] As in the above-mentioned embodiments, in the third embodiment, in addition to a printing machine for applying positioning marks and release varnish, only a die-cutting machine is required to manufacture the boxes; an expensive V-groove processing machine is not required.

[0059] According to the present invention, it is possible to realize boxes of the same quality as those made by the conventional technology of forming V-grooves at a low cost.

[0060] The above-described embodiments of the present invention are merely examples, and various modifications are possible within the scope of the present invention. [Explanation of symbols]

[0061] 1 First cutout 1a, 1b end points 2 Second cutout 2a, 2b end points 3 Connecting part 10 core box 11 Bottom plate part 12 Side plate part 13 Corner 14 groove 15 Tape 16 Stripping varnish 17 Adhesive 100 core box L First Finishing Line M Second Finishing Line P border S Blank Sheet C. Paperboard D. Poster t Thickness d1, d2, d3 distance r1, r2, r3 moving direction a, Sa outer paper b, Sb inner paper

Claims

1. A blank sheet (S) for a box (10) having a polygonal bottom plate portion (11) and rectangular side plate portions (12) disposed adjacent to each side of the bottom plate portion (11), a plurality of first cutouts (1) in the form of linear segments cut across the entire thickness of the blank sheet (S) at predetermined intervals on a first finish line (L) that is a boundary line between the bottom plate portion (11) and the side plate portion (12) on the inside of the assembled box (10); a plurality of second cutout portions (2) in the form of linear segments cut at predetermined intervals across the entire thickness of the blank sheet (S) on a second finish line (M) spaced from the first finish line (L) toward the side plate portion (12) by a distance (d1) equal to the thickness (t) of the blank sheet (S); Each of the first cutouts (1) and each of the second cutouts (2) are arranged alternately in the direction of the first and second finish lines (L, M); A blank sheet characterized in that, when viewed on the surface of the blank sheet (S) in a direction perpendicular to the extension direction of the first and second cutout portions (1, 2), the vicinity of each end point (1a, 1b) of the first cutout portion (1) and the vicinity of each end point (2b, 2a) of the second cutout portion (2) overlap by a predetermined length (d2).

2. 2. The blank sheet according to claim 1, wherein the overlapping length (d2) is equal to the thickness (t) of the blank sheet (S).

3. A method for manufacturing a blank sheet according to claim 1 or 2, comprising the steps of: A method for manufacturing a blank sheet, comprising a punching process for punching out at least a portion of the contour line of the blank sheet (S), wherein the first cutout portion (1) and the second cutout portion (2) are simultaneously punched out in the punching process.

4. 3. A box assembled by folding the side plate portions (12) of the blank sheet (S) according to claim 1 or 2 at right angles to the bottom plate portion (11) and fixing adjacent side plate portions (12) to each other.

5. 5. Box according to claim 4, characterized in that the box (10) is a core box for pasting boxes.

6. A pasted box comprising the box (10) according to claim 5 and a sticker attached to the box (10).

7. A method for manufacturing a pasted box, comprising assembling a box (10) using a blank sheet produced by the method for manufacturing a blank sheet according to claim 3, and attaching a sticker to the assembled box (10) to obtain a pasted box.

Images