JP6684878B2 - Carton with paper products - Google Patents

Description

  This invention relates to cartons containing paper products such as tissue paper.

Paper products such as tissue paper are packed in a carton made of paper, and a plurality of the carton are housed in a corrugated cardboard box and stored. At this time, since a plurality of corrugated cardboard boxes are stored in a stacked state, the corrugated cardboard boxes on the lower side may be crushed by the weight, and the inner carton may also be crushed. When the carton is crushed, it looks bad and becomes a defective product. Therefore, a technique has been developed in which the inner flap of the corrugated board box is crushed in the thickness direction to prevent the inner flap from colliding against the carton and to suppress the crush of the carton (Patent Document 1).
Further, as a method for suppressing the collapse of the carton, it has been conventionally performed to reduce the size (length, width, height) of the carton.

JP 2002-87423

However, in the case of the technique described in Patent Document 1, it is necessary to change the manufacturing process of the corrugated cardboard box, and it is not always applicable to a general corrugated cardboard box.
Further, when the carton is downsized, the size of paper products such as tissue paper contained in the carton becomes smaller, or it becomes necessary to reduce the number of sets of paper products, and the paper products in the carton are used up immediately. There is a problem that the replacement frequency becomes high.
Therefore, as a method of increasing the strength of the carton without reducing the size of the carton, it is possible to increase the basis weight and the paper thickness of the carton, but this increases the cost. Further, when the basis weight and the paper thickness of the carton become high, it becomes difficult to bend the carton into small pieces when the carton that has used up the paper product is discarded. On the other hand, when the basis weight and paper thickness of the carton are reduced, the strength is lowered, it becomes difficult to suppress the crushing of the carton, and the carton is ruptured during the production, which lowers the productivity.

Furthermore, when the basis weight and paper thickness of the carton are reduced, the ruled lines for folding the carton sheet and opening it in a box shape are difficult to fold, and there is a problem that the workability during carton production is poor. Here, the carton 2000 containing paper products is manufactured as shown in FIG. First, the top surface portion 2010 and the bottom surface portion 2020 of the sheet forming the carton, and the pair of side surface portions 2030 and 2040 are folded and opened into a rectangular column shape by hot melt, gluing or the like to form a box. Then, after the stack of paper products 2500 is inserted into this box, the first inner flap 2080 and the second inner flap 2090, which are one side surface of the opening of the box, are folded opposite to each other, and the outer side of the upper surface side The flap 2060 and the lower surface side outer flap 2070 are folded and overlapped, and the opening is sealed by hot melt or gluing. Similarly, the first inner flap 2080B and the second inner flap 2090B, which are the other side surfaces of the opening of the box body, are folded oppositely, and the upper surface side outer flap 2060B and the lower surface side outer flap 2070B are folded on the outer side thereof to open. Is completed and the carton 2000 containing paper products is assembled.
However, when the paper thickness of the carton becomes thin, it becomes difficult to fold the fourth ruled line R40 and the fifth ruled line R50 that bend the upper side outer flap 2060, the lower side outer flap 2070 that closes the opening of the carton, and the workability at the time of manufacturing the carton is improved. Inferior. In addition, as shown in FIG. 12, the fourth ruled line R40 and the fifth ruled line R50 are not bent in a straight line, and the upper surface side outer flap 2060 and the lower surface side outer flap 2070 are displaced and face each other, so that not only the appearance but also the box is distorted. Poor quality of the carton may occur. It is considered that this is because when the paper thickness of the carton becomes thin, it becomes difficult to insert a ruled line, and the top surface portion 2010 and the bottom surface portion 2020 connected to the fourth ruled line and the fifth ruled line are bent during bending. On the other hand, when the top surface portion 2010 and the bottom surface portion 2020 and the pair of side surface portions 2030 and 2040 are bent, it suffices to fold the flat surface (sheet) in one direction, and thus the above-mentioned problems are considered to be less. In this way, when the paper thickness of the carton is reduced, the bendability of the fourth ruled line and the fifth ruled line becomes particularly important.

  That is, the present invention improves the strength of the carton and suppresses the crushing of the carton without significantly increasing the basis weight and paper thickness of the carton, and further improves the bendability of the ruled lines to improve the workability during carton production. The purpose of the present invention is to provide a carton containing a paper product that improves the carton and reduces carton defects.

As a result of studies by the present inventors, in order to improve the bendability of the fourth ruled line and the fifth ruled line when the basis weight and the paper thickness of the carton are reduced, the width and height of the fourth ruled line and the fifth ruled line are improved. It was found that it is necessary to regulate the height within a predetermined range. Further, as the paper thickness of the carton becomes thinner, it becomes more difficult for the ruled lines to bend. Therefore, it is necessary to increase the height of the ruled lines per paper thickness to some extent to facilitate bending of the fourth and fifth ruled lines. I found it.
That is, in order to solve the above problems, the paper product-containing carton of the present invention is a paper rectangular parallelepiped carton containing a stack of paper products, and the basis weight of the carton is 250 to 370 g / m ² , and the paper thickness t. Is 0.28 to 0.43 mm / sheet, the long side Lc of the carton is 200 to 250 mm, the width Wc is 100 to 130 mm, the height Hc is 40 to 65 mm , and the length of the carton is defined in JIS-P8126. The ring crush value RL in the side direction is 500 to 800 N, and (RL / t) is 1.7 to 2.5 N / μm , and the carton has a rectangular top surface portion and a bottom surface portion, and the top surface portion and A first side surface portion connected to each one long side of the bottom surface portion via a first ruled line, and a first side surface portion connected to another long side of the top surface portion or the bottom surface portion via a second ruled line. 2 side parts A carton gluing portion that is connected to the other long side of the top surface portion or the bottom surface portion through a third ruled line and is connected to overlap with the inner surface of the second side surface portion, and both short side edges of the top surface portion. 4 a pair of upper surface side outer flaps connected via four ruled lines, a pair of lower surface side outer flaps connected to both short sides of the bottom surface portion via fifth ruled lines, and both short sides of the first side surface portion A sheet having a pair of first inner flaps connected to sides through sixth ruled lines and a pair of second inner flaps connected to both short sides of the second side surface portion through seventh ruled lines, respectively The first ruled line to the seventh ruled line are bent, and the upper surface side outer flap and the lower surface side outer flap are formed so as to overlap the outer sides of the first inner flap and the second inner flap, and are formed. The width W45 of the fourth ruled line and the fifth ruled line is 1.1. 2.2 mm, the height H45 of the fourth ruled line and the fifth ruled line extending inward from the inner surface of the carton is 0.23 to 0.55 mm, and the carton adjacent to the fourth ruled line and the fifth ruled line (H45 (mm) / t45 (mm)) = 0.50 to 1.90, where t45 is the thickness.

It is preferable that (H45 (mm) / W45 (mm)) = 0.10 to 0.60.
Of the pair of first ruled lines, the first ruled line that is farther from the third ruled line has a width W12 of 1.0 to 2.5 mm, and the height of the first ruled lines from the inner surface of the carton to the inner side. When H12 is 0.12 to 0.42 mm and the thickness of the carton adjacent to the first ruled line is t12, (H12 (mm) / t12 (mm)) = 0.45 to 1.60 Preferably there is.
Of the first ruled lines, the first ruled line closer to the third ruled line and the second ruled line have a width W2 of 1.0 to 2.5 mm, and the first ruled line is directed inward from the inner surface of the carton. And it is preferable that the height H2 of the second ruled line is 0.28 to 0.62 mm.
The width W67 of the sixth ruled line and the seventh ruled line is 1.0 to 2.5 mm, and the height H67 of the sixth ruled line and the seventh ruled line from the inner surface of the carton to the inner side is 0.22 to 0.53 mm. Is preferred.
It is preferable that H45 (mm)> H67 (mm).

It is preferable that the carton is composed of multiple layers, and the proportion of the hard layer containing 40 to 100 mass% of softwood-derived pulp is 15 to 75 mass%.
The hard layer preferably contains waste paper derived from corrugated board.
It is preferable that the long bend in the side direction stiffness before Symbol carton is 3.7~7.5mN · m. However, the bending stiffness is in accordance with the method described in ISO-2493, using an L & W Bending Tester (manufactured by Lorentzen & Wettre), a width of 38 mm in which the longitudinal direction of the carton 20 is aligned with the long side direction, and a length. One end side of the 100 mm test piece is fixed to the chuck of the sample table in a cantilever manner, and one surface outside the one end side of the test piece is brought into contact with the projecting engagement portion of the detection section on the sample table, and the test is performed. In the free state where the other end of the piece is not restrained, the bending length (the distance between the chuck of the sample table and the engaging portion, that is, the span (between beams) of the test piece) is set to 10 mm, and the bending angle (the test piece The angle of rotation of the chuck holding one end, the bending resistance (load) when the test piece is pressed against the engaging part during this rotation and the test piece bends 15 degrees, and Calculation formula: bending stiffness (mN · m) = 60 × bending resistance Resistance (mN) × bending length 10 (mm) ² ÷ {π × bending angle 15 (°) × sample width 38 (mm) × 1000}.
The compressive strength of the carton in the long side direction is preferably 130 to 220 N / box. However, the compression strength is the compression strength when the carton is placed on a compression tester so that the long side of the carton becomes longitudinal (axial direction) and a compression plate having an area of 177 cm 2 (circle with a diameter of 15 cm) is arranged on the carton. The surface of each of the outer flaps of the carton is completely inside the plate, and the compression plate is compressed by applying a uniaxial load under the condition of a pressurizing speed of 10 mm / min. Then, the first inflection point that appears first and has an upward convexity is used, and the values obtained 5 times under constant temperature and humidity conditions of 23 ° C. and 50% RH are averaged.

  According to this invention, without significantly increasing the basis weight and paper thickness of the carton, the strength of the carton is improved to prevent the carton from being crushed, and the foldability of the ruled lines is further improved to improve workability during carton production. Can be improved, and carton defects can be reduced.

It is a perspective view of a carton containing a paper product according to an embodiment of the present invention. It is a perspective view showing each component of a carton containing paper products. It is a development view of a carton. It is sectional drawing which shows the width of a ruled line, height, and the thickness of a carton. It is a figure which shows the relationship of the displacement and load of the axial direction obtained by the measurement of compressive strength. It is a figure which shows the evaluation method of the bendability of a carton at the time of disposal. It is a figure which shows the ruled line crack of the actual carton surface. It is sectional drawing which shows the carton in the state folded for setting in a folder (folding machine). It is a schematic cross section which shows the layer structure of a carton. It is a figure which shows the measuring method of a ring crush value. It is a figure which shows the manufacturing method of a carton. It is a schematic diagram which shows the carton whose ruled line is a straight line and is not bent and whose quality is bad.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a perspective view of a carton 20 containing paper products according to an embodiment of the present invention, FIG. 2 is a perspective view showing each component of the carton 20 containing paper products, and FIG. 3 is a development view of the carton 20. The carton 20 containing paper products (hereinafter also referred to as “carton” as appropriate) is made of a rectangular parallelepiped box made of paper containing a stack of sheet-like paper products 25, and the height H of the carton 20 containing paper products is , The height along the stacking direction of the paper product 25 inside. Examples of the paper product 25 include tissue paper, hand towel, and the like. The individual paper products 25 may be, for example, Z-folded or V-folded in a pop-up manner to be stacked, or may be stacked so as not to pop up. . Also, the carton 20 can be formed from paperboard or the like.

Then, as shown in FIGS. 2 and 3, the carton 20 containing paper products includes a rectangular top surface portion 201 and a bottom surface portion 202 facing the rectangular top surface portion 201, and one of the top surface portion 201 and the bottom surface portion 202 (see FIG. 2). The first side surface portion 203 is connected to the long side on the right side via the first ruled lines R11 and R12, respectively, and is connected to the other long side on the left side in FIG. 2 via the second ruled line R2 on the top surface portion 201. Carton gluing that is connected to the other long side (on the left side in FIG. 2) of the bottom surface portion 202 via the third ruled line R3 and is overlapped and connected to the inner surface of the second side surface portion 204. The portion 205, a pair of upper surface side outer flaps 206 and 206B connected to both short sides of the top surface portion 201 via fourth ruled lines R4, and both short sides of the bottom surface portion 202 via fifth ruled lines R5, respectively. A pair of lower surface side outer flaps 207 connected, 07B, a pair of first inner flaps 208, 208B connected to both short sides of the first side surface portion 203 via sixth ruled lines R6, and a seventh ruled line R7 on both short sides of the second side surface portion 204, respectively. One sheet (see FIG. 3) having a pair of second inner flaps 209 and 209B connected via is formed by bending the first ruled line R11 to the seventh ruled line R7. Each ruled line is a fold line obtained by crushing the sheet so that it can be folded neatly when the sheet is opened in a three-dimensional shape and assembled.
Note that the top surface portion 201 is provided with perforations 212 for taking out the paper products 25 to be stored.

Here, at the time of manufacturing the carton 20, first, the carton gluing portion 205 is adhered to the side edge of the second side surface portion 204 in the long side direction so that the top surface portion 201 and the bottom surface portion 202, and the pair of side surfaces. The parts 203 and 204 are box-shaped.
Then, after the laminated body of the paper products 25 is inserted into the box-shaped body formed by adhering the carton gluing portion 205 with hot melt, glue or the like, the first inner flap that is one side surface of the opening of the box-shaped body is inserted. 208 and the second inner flap 209 are opposed to each other, and the outer flap 206 on the upper surface side and the outer flap 207 on the lower surface side, which are coated with an adhesive such as hot melt or glue, are folded on the outer side to seal the opening. Similarly, the first inner flap 208B and the second inner flap 209B, which are the other side surfaces of the opening of the box body, are oppositely folded, and the upper surface side outer flap 206B and the lower surface side outer flap 207B are folded on the outer side thereof to open. Closed. In this way, the carton 20 containing paper products is assembled.
The lower ends of the upper surface side outer flaps 206 and 206B are bonded so as to cover the upper ends of the lower surface side outer flaps 207 and 207B, respectively, and are connected to the first side surface portion 203 and the second side surface portion 204 at right angles. Forming a side surface portion.

The basis weight of the carton 20 is 250 to 370 g / m ² , and the paper thickness is 0.28 to 0.43 mm / sheet.

When the basis weight of the carton 20 is less than 250 g / m ² , the strength of the carton 20 is reduced and the carton 20 is easily crushed. When the basis weight of the carton 20 exceeds 370 g / m ² , the strength of the carton 20 increases but the cost increases. The basis weight of the carton is preferably 250~340g / ^{m 2,} and more preferably 250-300 g / ^{m 2.} The basis weight of the carton 20 is measured per sheet based on JIS P8124.
When the paper thickness of the carton 20 is less than 0.28 mm / sheet, the strength of the carton 20 is reduced and the carton 20 is easily crushed. If the paper thickness of the carton 20 exceeds 0.43 mm / sheet, the strength of the carton 20 increases, but the cost increases. The paper thickness of the carton is preferably 0.28 to 0.38 mm / sheet, and more preferably 0.28 to 0.34 mm / sheet.

In the present invention, the width W45 of the fourth ruled line R4 and the fifth ruled line R5 is 1.0 to 2.5 mm, and the height H45 of the fourth ruled line R4 and the fifth ruled line R5 that are inward from the inner surface of the carton 20 is 0. The feature is that it is 23 to 0.55 mm.
As described above, it is necessary to improve the bendability of the fourth ruled line R4 and the fifth ruled line R5 when the basis weight and the paper thickness of the carton are reduced, and therefore, the fourth ruled line R4 and the fifth ruled line R5 cannot be bent. The width W45 and the height H45 are defined.
Here, the width W45, the height H45, and the carton thickness t45 described later are shown in FIG. The width W45 is the maximum width of the ruled line in the direction (width direction) perpendicular to the extending direction of the ruled lines (the fourth ruled line R4 and the fifth ruled line R5). The height H45 is from the inner surface (the surface in contact with the paper product 25) of the carton 20 adjacent to the ruled lines (the fourth ruled line R4 and the fifth ruled line R5) to the maximum protrusion of the ruled lines (the fourth ruled line R4 and the fifth ruled line R5). Is the distance. The carton thickness t45 is the thickness of the carton 20 adjacent to the ruled lines (the fourth ruled line R4 and the fifth ruled line R5).
In addition, "adjacent" means the position of the carton outside the width W45 of the fourth ruled line R4 and the fifth ruled line R5.

The height H45 of the ruled line is measured using a thickness gauge (a dial thickness gauge "PEACOCK G" manufactured by Ozaki Seisakusho). The measurement conditions are a measuring force of 1.8 N or less, a gauge head diameter of 10 mm, a ruled line is set between the gauge heads, the gauge is read when the gauge head is lowered at a speed of 1 mm or less per second, and the value is B And In addition, the paper thickness t45 on both outer sides of the ruled line width W45 is measured at two places (the measurement condition of t45 is the same as H45) so that the ruled line is not included, and the average value is set to A. Then, the height H45 = BA is calculated. The measurements of A and B are repeated 10 times, and the average value of H45 is adopted.
When the value B is measured, the box-shaped carton may be disassembled and then measured, but the creases of the ruled lines are likely to remain, and the creases may change the value B. Therefore, as shown in FIG. 4, the carton on both outer sides sandwiching the ruled line is flattened so that the surfaces thereof are flush with each other.
The heights of other ruled lines, which will be described later, are measured in the same manner.

If the width W45 is less than 1.0 mm, it is difficult to bend the ruled lines (the fourth ruled line R4 and the fifth ruled line R5), and the upper side outer flap 206 (206B) connected to the fourth ruled line R4 and the fifth ruled line R5, the lower side. The outer flap 207 (207B) is inferior in bendability, and the workability at the time of manufacturing a carton is deteriorated. If the width W45 exceeds 2.5 mm, the ruled line is too wide and does not bend in a straight line so that the carton can be processed, but the carton becomes defective as shown in FIG. The width W45 is preferably 1.1 to 2.2 mm, more preferably 1.2 to 2.0 mm.
If the height H45 is less than 0.23 mm, it is difficult to bend the ruled lines (the fourth ruled line R4 and the fifth ruled line R5), and the upper outer flap 206 (206B) that is connected to the fourth ruled line R4 and the fifth ruled line R5, the lower surface. The outer side flap 207 (207B) is inferior in bendability, and the workability at the time of carton manufacturing is deteriorated. If the height H45 exceeds 0.55 mm, ruled line cracks occur. As shown in FIG. 7, the ruled line cracking is a phenomenon in which the corner line paper which is the opposite side of the ruled line is torn when the ruled line is inserted too deeply (the ruled line height is made too high), and the carton is defective. Become.
The height H45 is preferably 0.23 to 0.45 mm, more preferably 0.26 to 0.39 mm.

Further, as described above, as the basis weight of the carton and the paper thickness are made thinner, it becomes more difficult for the ruled lines to bend. Therefore, the height of the ruled lines per paper thickness is increased to some extent to make the fourth ruled line R4 and the fifth ruled line R5. It is necessary to make it easy to bend. From this, (H45 (mm) / t45 (mm)) is defined.
(H45 (mm) / t45 (mm)) = 0.50 to 1.90. When (H45 / t45) = 0.50 is less than the height of the ruled line with respect to the carton thickness, the ruled lines (the fourth ruled line R4 and the fifth ruled line R5) are difficult to bend and the fourth ruled line The upper surface side outer flap 206 (206B) and the lower surface side outer flap 207 (207B) connected to R4 and the fifth ruled line R5 are inferior in bendability, and the workability at the time of manufacturing the carton is deteriorated. If (H45 / t45) = 1.90 is exceeded, ruled line cracks occur.
(H45 / t45) = 0.65 to 1.50 is preferable, and 0.75 to 1.30 is more preferable.

It is preferable that (H45 (mm) / W45 (mm)) = 0.10 to 0.60. If (H45 / W45) = 0.10 is less than 0.10, the height of the ruled line becomes relatively low with respect to the width of the ruled line, and the quality of the ruled line when the ruled line is put on the sheet is not stable (inferior productivity). There is. When (H45 / W45) = 0.60 is exceeded, the height of the ruled line becomes relatively large with respect to the width of the ruled line, and the quality of the ruled line when the ruled line is put on the sheet may be unstable (inferior productivity). is there.
(H45 / W45) = 0.10 to 0.40 is more preferable, and 0.15 to 0.30 is further preferable.

By the way, as shown in FIG. 8, in the carton 20, the carton gluing part 205 is previously adhered to the side edge of the second side surface part 204 in the long side direction, and the top surface part 201 and the bottom surface part 202, and the pair of side surface parts 203, It is set in a folder (folding machine) in a state where it is folded so that 204 touches it, and after opening (raising) the carton 20 in the direction of the arrow in FIG. 8, the stack of paper products 25 is inserted. There is. Note that, in FIG. 8, the carton 20 is illustrated as being slightly opened to facilitate understanding, but in actuality, the top surface portion 201 and the bottom surface portion 202 are set so as to be in close contact with each other.
Therefore, the folded carton 20 is in an initial state in which the first ruled line R12 is not folded (in some cases, the carton gluing portion 205 is disposed on the side edge in the long side direction of the second side surface portion 204). The first ruled line R12 may be preliminarily folded before being adhered to the first ruled line R12). If the first ruled line R12 is not easily bendable when the carton 20 is opened, it is difficult to open the box and the workability during carton manufacturing. May decrease. Therefore, it is preferable to define the first ruled line R12 as follows.
That is, of the pair of first ruled lines R11, R12, the width W12 of the first ruled line R12 that is farther from the third ruled line R3 is 1.0 to 2.5 mm, and the first inner ruled line of the carton 20 goes inward. The height H12 of the ruled line R12 is preferably 0.12 to 0.42 mm.
If the width W12 is less than 1.0 mm, it is difficult to bend the ruled line (first ruled line R12), and the workability (boxing property) during carton production may be poor. If the width W12 exceeds 2.5 mm, the ruled line is too wide and does not bend in a straight line so that the carton can be processed, but the carton may fail as shown in FIG.
If the height H12 is less than 0.12 mm, it is difficult to bend the ruled line (first ruled line R12) and the processability (boxing property) during carton production may be poor. If the height H12 exceeds 0.42 mm, ruled line cracks may occur.

The width W12, the height H12, and the carton thickness t12 described later are defined in the same manner as the width W45, the height H45, and the carton thickness t45 shown in FIG.
The width W12 is more preferably 1.1 to 2.2 mm, further preferably 1.2 to 2.0 mm. Further, the height H12 is more preferably 0.12 to 0.32 mm, further preferably 0.14 to 0.29 mm.

When the thickness of the carton adjacent to the first ruled line R12 is t12, it is preferable that (H12 (mm) / t12 (mm)) = 0.45 to 1.60. When (H12 / t12) is less than 0.45, the projected height of the ruled line is too small, the ruled line (first ruled line R12) is difficult to bend, and the workability during carton production may be poor. If (H12 / t12) = 1.60 is exceeded, ruled line cracks may occur.
(H12 / t12) = 0.45 to 1.30 is more preferable, and 0.55 to 1.00 is further preferable.

  It is preferable that (H12 (mm) / W12 (mm)) = 0.10-0.40. If (H12 / W12) = 0.10 is less than 0.10, the height of the ruled line becomes relatively low with respect to the width of the ruled line, and the quality of the ruled line when the ruled line is put on the sheet is not stable (poor productivity). There is. If (H12 / W12) = 0.40 is exceeded, the height of the ruled line becomes relatively large with respect to the width of the ruled line, and the quality of the ruled line when the ruled line is inserted into the sheet may be unstable (inferior productivity). is there. (H12 / W12) = 0.10 to 0.30 is more preferable, and 0.10 to 0.20 is further preferable.

  It is preferable that H45 (mm)> H12 (mm). This is because the long side direction of the carton 20 is CD and the short side direction is MD, and the ruled line H12 in the long side direction is more likely to cause ruled line cracking than the ruled line H45 in the short side direction, and H12 is small. This is because it is possible to effectively prevent the ruled line from cracking.

Further, as shown in FIG. 8, the carton 20 is set in a folder (folding machine) in a state of being folded so that the top surface portion 201 and the bottom surface portion 202 and the pair of side surface portions 203 and 204 are in contact with each other. At this time, the ruled lines R2 and R11 are in a bent state. Therefore, by defining the width and height of the ruled lines R11 and R2, the thickness of the carton becomes constant in the folded state, the supply of the carton to the folder is stabilized, and the productivity is improved.
That is, of the first ruled lines, the width W2 of the first ruled line R11 and the second ruled line R2, which are closer to the third ruled line R3, is 1.0 to 2.5 mm, and the width W2 of the first ruled line goes from the inner surface of the carton 20 to the inner side. The height H2 of the first ruled line R11 and the second ruled line R2 is preferably 0.28 to 0.62 mm.
Note that "W2" and "H2" represent the width and height of both the first ruled line R11 and the second ruled line R2. Further, “W2” and “H2” in Tables 1 and 2 described later are average values of the values of the first ruled line R11 and the second ruled line R2.

If the width W2 is less than 1.0 mm, it becomes difficult to fold the carton along the ruled lines R11 and R2, the thickness of the carton in the folded state becomes large, and the supply of the carton to the folder is not stable, resulting in production. May deteriorate. If the width W2 exceeds 2.5 mm, the ruled line is too wide and does not bend in a straight line neatly, and the carton can be processed, but the carton becomes defective as shown in FIG.
If the height H2 is less than 0.28 mm or exceeds 0.62 mm, in any case, it becomes difficult to bend the carton along the ruled lines R11 and R2, and variations in the thickness of the carton in the folded state increase, The supply of cartons to the folders may be unstable and productivity may drop.

The width W2 and the height H2 are defined in the same manner as the width W45 and the height H45 shown in FIG.
The width W2 is more preferably 1.1 to 2.2 mm, further preferably 1.2 to 2.0 mm. Further, the height H2 is more preferably 0.28 to 0.56 mm, further preferably 0.32 to 0.53 mm.
The heights of the ruled lines R2 and R12 immediately after the ruled lines are inserted are the same. However, after that, since the ruled line R3 is not folded and the ruled lines R2 and R11 are firmly bent, the structure of the ruled lines R2 and R11 is significantly changed (the ruled line becomes higher), and the height of the ruled line is R2 (= R11 )> R12.

The sixth ruled line R6 and the seventh ruled line R7 are connected to the first inner flap 208 (208B) and the second inner flap 209 (209B), respectively, and the first inner flap 208 after the carton is opened in the shape of a rectangular column. (208B) and the degree of opening of the second inner flap 209 (209B) are affected.
Therefore, the width W67 of the sixth ruled line R6 and the seventh ruled line R7 is 1.0 to 2.5 mm, and the height H67 of the sixth ruled line R6 and the seventh ruled line R7 from the inner surface of the carton 20 toward the inside is 0.22 to 0. It is preferably 0.53 mm.
If the width W67 is less than 1.0 mm, the first inner flap 208 (208B) and the second inner flap 209 (209B) may be less bendable, and the workability during carton production may be reduced. When the width W67 exceeds 2.5 mm, the ruled line is too wide and does not bend in a straight line neatly, and the carton can be processed, but the carton failure as shown in FIG. 12 may occur.
When the height H67 is less than 0.22 mm, the first inner flap 208 (208B) and the second inner flap 209 (209B) are less likely to bend, and the workability during carton production may be reduced. If the height H67 exceeds 0.53 mm, ruled line cracks may occur.

The width W67 and the height H67 are defined in the same manner as the width W45 and the height H45 shown in FIG.
The width W67 is more preferably 1.1 to 2.2 mm, further preferably 1.2 to 2.0 mm. Further, the height H67 is more preferably 0.22 to 0.44 mm, further preferably 0.25 to 0.37 mm.

  Furthermore, it is preferable that H45 (mm)> H67 (mm). This is because when H67 (mm) is reduced, it becomes slightly difficult to bend when the first inner flap 208 (208B) and the second inner flap 209 (209B) are folded along the sixth ruled line R6 and the seventh ruled line R7, respectively. This is because a certain amount of repulsive force (the second inner flap returns to the original) is generated and the second inner flap opens, and it becomes easy to bond the upper surface side outer flap 206 (206B) and the lower surface side outer flap 207 (207B).

By the way, generally, when the basis weight and the paper thickness of the carton are lowered, the strength of the carton 20 is lowered and the carton is crushed. The strength of the carton 20 can be evaluated by a ring crush value, which is a compressive strength, and in particular, when the carton-containing cardboard box 100 described later is stored, the ring crush value RL in the long side direction in which the carton 20 inside is easily crushed is increased. Is required. Then, for example, as shown in FIG. 9, the carton 20 is composed of multiple layers 20U to 20Z, and the proportion of the hard layers 20X, 20Y, and 20Z in which the pulp derived from softwood is 40 to 100 mass% is 15 to 75 mass. It has been found that by configuring the carton so that the strength of the carton can be increased without increasing the cost even if the basis weight and the paper thickness of the carton are low.
Here, instead of increasing the strength of all the layers constituting the carton 20, if a strong and hard hard layer is laminated on a part of the layers of the carton 20, even if the basis weight and the paper thickness of the carton are low, The crushing of the carton can be reduced.
The hard layers 20X, 20Y, and 20Z preferably contain 40 to 80% by mass, more preferably 40 to 60% by mass of softwood-derived pulp. Further, among the layers constituting the carton 20, the layers 20U, 20V, 20W other than the hard layers 20X, 20Y, 20Z contain less than 40% by mass of pulp derived from softwood and have strengths higher than those of the hard layers 20X, 20Y, 20Z. Low.
The hard layers 20X, 20Y, and 20Z can be made, for example, from a raw material mainly composed of waste paper derived from corrugated board, and the total amount of pulp derived from softwood is adjusted by adjusting the blending amount of waste paper derived from cardboard. Therefore, the cost of virgin pulp can be suppressed. The other layers 20U, 20V, and 20W can be made from, for example, a raw material mainly containing magazine waste paper.
The position of the hard layer in the layers of the carton 20 is not limited, but a layer other than the hard layer is preferably provided on the surface. By providing a layer other than the hard layer on the surface, the surface properties of the carton are improved, and the touch and print quality are improved.

The "pulp derived from softwood" in the hard layers 20X, 20Y, and 20Z can be quantified according to the fiber composition test method of JIS P8120. Even if it is difficult to distinguish the softwood pulp by dyeing according to this test method, the fiber form of the softwood pulp (fiber length of about 2.0 to 4.5 mm, fiber width of about 20 to 70 μm) is a hardwood pulp. It can be determined because it is different from the fiber form (fiber length is about 0.8 to 1.8 mm, fiber width is about 10 to 50 μm).
If the proportion of the hard layer in the carton is less than 15% by mass, the strength of the carton may decrease when the basis weight or paper thickness of the carton is reduced. When the proportion of the hard layer in the carton exceeds 75% by mass, it is difficult to form a ruled line at the time of manufacturing the carton, the moldability is deteriorated, and it may be difficult to bend the carton at the time of disposal. The proportion of the hard layer in the carton is more preferably 25 to 70% by mass, and most preferably 40 to 60% by mass.
In addition, when the carton is immersed in water or hot water, the layers are separated, and thus the separated layers are disintegrated to recover the fibers, and the amount of the long fibers is measured by microscopic observation. The ratio of can be calculated.

The ring crush value RL of the carton 20 is preferably 500 to 800 N and (RL / t) is 1.7 to 2.5 N / μm.
If the ring crush value RL is less than 500 N, the carton 20 is likely to be crushed, and if the ring crush value RL exceeds 800 N, the strength is increased more than necessary and the cost is increased.
RL is preferably 550 to 740N, more preferably 600 to 720N.

The ring crush value is measured according to JIS-P8126 (2005) by collecting a strip-shaped test piece having a width of 12.7 mm and a length of 152.4 mm from the sheet of the carton 20. Specifically, as shown in FIG. 10, the compressive strength when a load F is applied in the axial direction of the test piece S1 wound in a ring shape (short direction of the test piece) is measured.
The ring crush value RL in the long side direction of the carton 20 means that the long side direction of the test piece S1 is perpendicular to the long side direction of the carton 20 (that is, the axial direction to which the load is applied is parallel to the long side direction of the carton 20). Say the case.
Here, as shown in FIG. 3, since the length of the carton 20 in the width direction is about 130 mm or less, the test piece S1 for measuring the ring crush value RL has at least one ruled line of the carton 20 (see FIG. 3 includes two ruled lines R11 and R12). However, since the ruled lines are in the same direction as the direction in which the test piece S1 is compressed, if the number of ruled lines included in the test piece S1 is two or less, there is no problem in measurement.

Further, (RL / t) represents the ring crush value RL per paper thickness t, and the higher (RL / t) is, the higher the strength is even if it is thin. When (RL / t) is less than 1.7, RL becomes low and the carton is easily crushed. On the other hand, if (RL / t) exceeds 2.5, the strength becomes high, but the carton becomes too hard, and it becomes difficult to form ruled lines, and the carton formability may be poor. Further, as described above, when the hard layer contains corrugated cardboard-derived waste paper, if the (RL / t) exceeds 2.5, the percentage of corrugated cardboard-derived waste paper in the carton becomes too large, and the carton becomes brittle. , When it is formed into a box, creases may be broken.
(RL / t) is preferably 1.9 to 2.5 N / μm, and more preferably 2.0 to 2.5 N / μm.

When the carton 20 contains waste paper derived from corrugated board, the content rate of the waste paper derived from corrugated board in the pulp raw material in the carton 20 is preferably 20 to 70% by mass, more preferably 30 to 70% by mass, and 40 to 60% by mass. % Is most preferred.
When the content ratio of waste paper derived from corrugated board is less than 20% by mass, the strength is difficult to increase and the carton may be easily crushed. On the other hand, when the content ratio of waste paper derived from corrugated board exceeds 70% by mass, the carton becomes brittle, which may cause crease cracks when formed into a box shape.
In addition, when corrugated cardboard waste paper is blended, aluminum contained in the corrugated cardboard waste paper (derived from aluminum vapor-deposited paper packs, foil stamping paper, etc.) becomes a foreign substance and may be contained in the carton. Since it becomes a claim that foreign substances derived from aluminum are contained in the carton, it is necessary to properly adjust the reject rate of screens and the like in the used paper pulp process so that the size of foreign substances derived from aluminum contained in the carton is 3.0 mm ² or less. Is preferred.

It is preferable that the bending stiffness SL in the long side direction of the carton 20 is 3.7 to 7.5 mN · m because the strength can be maintained even with a low basis weight and the crushing of the carton can be further suppressed. If the bending stiffness SL of the carton is less than 3.7 mN · m, the carton is likely to be crushed, and if it exceeds 7.5 mN · m, the strength may be increased more than necessary and the cost may be increased. The bending stiffness SL is preferably 3.7 to 6.0 mN · m, and more preferably 3.7 to 4.8 mN · m.
The bending stiffness is based on the method described in ISO-2493, and using a L & W Bending Tester (manufactured by Lorentzen & Wettre), one end side of a test piece having a width of 38 mm and a length of 100 mm is cantilevered on a chuck of a sample table. Then, one side of the test piece outside the one end side is brought into contact with the projecting engagement part of the detection part on the sample table. At this time, the other end of the test piece is in a free state where it is not restrained. In this state, the bending length (the distance between the chuck of the sample table and the engaging portion, that is, the span (between beams) of the test piece) was set to 10 mm, and the bending angle (the rotation angle of the chuck holding one end of the test piece, this rotation At this time, the test piece was pressed against the engaging portion, and the bending resistance (load) was measured when the test piece was bent at 15 degrees, and the bending resistance (load) was calculated by the following calculation formula. Bending stiffness (mN · m) = 60 × bending resistance (mN) × bending length 10 (mm) ² ÷ {π × bending angle 15 (°) × sample width 38 (mm) × 1000}.
The bending stiffness SL refers to the case where the long side direction (between beams) of the test piece is equal to the long side direction of the carton 20. The bending stiffness ST refers to a case where the long side direction (between beams) of the test piece is equal to the width direction of the carton 20.

  The bending stiffness ST is preferably 7.5 to 14.5 mN · m, more preferably 7.5 to 12.0 mN · m, and most preferably 7.5 to 9.5 mN · m. If the bending stiffness ST is less than 7.5 mN · m, for example, when storing a product in which the carton 20 is packaged in plural so that the top surface portion 201 faces upward, the side surface portions 203 and 204 of the carton 20 bend. There are cases. On the other hand, when the bending stiffness ST exceeds 14.5 mN · m, the strength may be increased more than necessary and the cost may be increased.

The compressive strength of the carton 20 in the long side direction is preferably 130 to 220 N / box. If the compressive strength is less than 130 N / box, the strength of the carton 20 may decrease and the carton 20 may be easily crushed. If the compressive strength exceeds 220 N / box, the strength of the carton 20 increases, but the cost may increase. The compressive strength is more preferably 130 to 190 N / box, and most preferably 135 to 160 N / box.
The above compression strength is performed as follows. First, the carton 20 is placed on a compression tester (for example, a product name manufactured by TS E Co., Ltd .: AUTOCOM) so that the long side thereof becomes vertical (axial direction), and a compression plate having an area of 177 cm 2 (circle having a diameter of 15 cm). Are placed on the carton 20. At this time, the surfaces of the outer flaps 206 and 207 of the carton 20 are completely inside the compression plate. Then, a uniaxial load is applied to the compression plate under the condition of a pressurizing speed of 10 mm / min to compress the compressed plate, and in the graph of axial displacement and load shown in FIG. The point (the lower part often collapses or buckles when the long side of the carton 20 is placed vertically (axial direction)) was defined as the compressive strength (N). The measurement was performed by averaging the values obtained 5 times under the constant temperature and humidity conditions of 23 ° C. and 50% RH.
The reason why the compressive strength in the long side direction of the carton 20 is defined is that when a plurality of corrugated boxes having the long sides of the carton 20 in the vertical direction are housed in the corrugated cardboard 10 and stored, a plurality of carton-containing corrugated cardboard boxes 100 are stacked. This is because it is stored, but in that case, a load may be applied in the long side direction of the carton 20 and the carton 20 may be crushed.

It is preferable that the long side Lc of the carton is 200 to 250 mm, the width Wc is 100 to 130 mm, and the height Hc is 40 to 65 mm.
When the long side Lc of the carton 20 is less than 200 mm, the width Wc is less than 100 mm, or the height Hc is less than 40 mm, the size of paper products such as tissue paper in the carton 20 becomes small, It may be necessary to reduce the number of groups, and the usability may deteriorate. When the long side Lc of the carton 20 exceeds 250 mm, the width Wc exceeds 130 mm, or the height Hc exceeds 65 mm, the carton 20 becomes too large and the strength is lowered, and the carton 20 may be easily crushed. is there. The long side Lc of the carton 20 is preferably 220 to 240 mm, more preferably 220 to 230 mm. The width Wc of the carton 20 is preferably 110 to 125 mm, more preferably 110 to 120 mm. The height Hc of the carton 20 is preferably 42 to 55 mm, more preferably 42 to 48 mm.

  It is needless to say that the present invention is not limited to the above-described embodiments and covers various modifications and equivalents included in the concept and scope of the present invention. For example, the type and material of the carton and the paper product contained therein, and the stacking mode of the paper product are not limited.

A tissue paper carton (tissue paper box) 20 accommodating tissue paper (paper product: a predetermined number of sets) stacked in a pop-up manner was prepared. Various dimensions of the carton 20 are shown in Tables 1 and 2.
The carton had a total of 6 layers, of which 3 were hard layers. Since the basis weight of each layer was the same, the ratio of the hard layer was 50% by mass. In each hard layer, the proportion of softwood-derived pulp was set to 50% by mass. As the pulp material for each layer, pulp mainly composed of magazine waste paper was used for layers other than the hard layer, and waste paper pulp derived from corrugated board was used for the hard layer.
A multi-layer carton was obtained by making a paper with a known multi-layer paper making machine having many head boxes. A known paper strength agent was applied between the layers as needed.
The basis weight of the carton, the paper thickness t, the size of each ruled line, the compressive strength, and the bending stiffness in the long side direction were measured as described above.

Various properties when a ruled line was bent from the sheet shown in FIG. 3 to manufacture a carton were evaluated as follows.
Ruled line cracks: The presence or absence of ruled line cracks at the corners of the carton surface after manufacturing the carton was visually evaluated.
Ease of bending ruled lines: The processing speed during carton production was evaluated. If the ruled lines are difficult to bend, the processing speed is reduced and the productivity is reduced.

Ruler line straightness: The ruler line straightness that appeared on the surface of the carton after the carton was manufactured was evaluated as follows.
(1) Linearity of the ruled lines R4 and R5: The ratio of the number of cartons in which the deviation amount d (see FIG. 12) in the width direction of the upper outer flap 206 and the lower outer flap 207 after manufacturing the carton is 1 mm or more was evaluated. .
(2) Linearity of ruled lines R6 and R7: The width Wc of the carton is measured at three positions in different height directions of the carton, and the carton in which the difference between the maximum value and the minimum value of Wc is 1 mm or more among the predetermined number of cartons The ratio of the number of was evaluated.
(3) Linearity of the ruled lines R11 and R12: The height Hc of the carton is measured at 5 locations in different long side directions of the carton, and the difference between the maximum value and the minimum value of Hc is 1 mm or more among a predetermined number of cartons. The percentage of the number of cartons was evaluated.

Quality stability of creases: The processing speed at the time of inserting creases during carton production was evaluated. If the quality of the ruled lines is not stable, the processing speed decreases and the productivity decreases.
Supplyability of carton: The operability of the folder when the carton in the folded state as shown in FIG. 8 was set in a folder (folding machine) and operated was evaluated.
Openability of carton: The processing speed during carton production was evaluated. When the boxing property is poor, the processing speed is reduced and the productivity is reduced.
Flexibility: During operation in MF, the flexibility of the flap portion was evaluated.
Adhesion between the inner flap and the outer flap: Ease of adhesion when the outer flap was adhered to the outer side of the inner flap was evaluated.
In each evaluation, the crushing at a normal level that causes no practical problem was set to “3”, slightly better than this, “4”, and excellent was set to “5”. Similarly, "2" means that it is inferior to "3", and "1" means that it is extremely inferior. If the evaluation is 3 to 5, there is no problem.

  In addition, a pack product obtained by stacking five cartons 20 in the height direction and packing them with a film is accommodated in a predetermined cardboard box 10 in which a plurality of stages with the long sides of the cartons 20 being longitudinal are stacked, and the carton-containing cardboard boxes are stacked in ten stages. For 1 week, the lowermost carton containing cardboard box was opened, and the presence or absence of collapse of the carton was visually determined. In the evaluation, the usual level of crushing, which is not a problem in practical use, is "3", slightly better than "4", and better is "5". Similarly, "2" means that it is inferior to "3", and "1" means that it is extremely inferior. If the evaluation is 3 to 5, there is no problem.

Further, the bendability of the carton at the time of disposal was evaluated as follows. First, the empty carton 20 that has been used up with tissue paper is formed into a rectangular column shape with the outer flaps 206 and 207 opened, and is further crushed along the ruled lines as shown in FIG. And the side surface portion 203 are overlapped with each other. Next, this carton was manually folded back at the central portion C in the long side direction, and the ease of folding was evaluated.
In the evaluation, the same value as the conventional product was set to "3", and this was used as a reference and evaluated in the same manner as the above-mentioned five-level evaluation.

  The obtained results are shown in Tables 1 and 2.

  As is clear from Table 1 and Table 2, in the case of each example in which the basis weight of the carton, the paper thickness, and the dimensions of the fourth and fifth ruled lines are within the predetermined ranges, the basis weight of the carton and the paper thickness are remarkably increased. It was possible to improve the strength of the carton without increasing it and suppress the collapse of the carton. Further, although the basis weight and the paper thickness were not high, the ruled lines R4 and R5 were easily bent, the workability during carton production was excellent, and the linearity of the ruled lines R4 and R5 was excellent, and the carton failure was suppressed.

  On the other hand, in the case of Comparative Example 1 in which the basis weight and paper thickness of the carton were less than the specified ranges, the strength of the carton decreased and the carton collapsed.

  In the case of Comparative Example 2 in which the basis weight and the paper thickness of the carton exceeded the predetermined ranges, the strength of the carton was increased and the carton was not crushed, but it was difficult to bend the carton at the time of disposal.

In the case of Comparative Examples 3 and 4 in which the width W45 of the fourth ruled line and the fifth ruled line was less than the specified range and the height H45 and (H45 / t45) exceeded the specified range, it was difficult to bend the ruled lines R4 and R5 and the carton The workability at the time of manufacturing was inferior and the ruled lines were cracked.
In the case of Comparative Example 4, since W67 exceeded 2.5 mm, the ruled lines R6 and R7 were not bent in a straight line and could be processed into a carton, but a carton defect occurred.

Also in Comparative Examples 5 to 9, 10, 13, and 14 in which the width W45 was less than the specified range, the ruled lines R4 and R5 were difficult to bend, and the workability during carton production was poor.
In Comparative Examples 7 and 8 in which the width W12 of the first ruled line was less than the specified range, the first ruled line R12 was difficult to bend, and the workability (boxing property) during carton production was further deteriorated. Further, in the case of Comparative Example 8, since the heights H12 and (H12 / t12) were also less than the specified range, the boxing property was the worst.
In addition to Comparative Example 8, in the case of Comparative Example 9 in which (H12 / W12) exceeded the specified range, the quality of the ruled lines when the ruled lines were formed on the sheet was not stable, and the productivity was further deteriorated. Further, in the case of Comparative Example 9, (H12 / t12) exceeded the specified range, and the ruled line R12 cracked.
In the case of Comparative Example 10 in which the width W12 exceeded the specified range, the ruled line R12 was not a straight line and was not bent, and although the carton could be processed, further carton failure occurred. Further, in the case of Comparative Example 10, (H12 / W12) was less than the specified range, the quality of the ruled lines when the ruled lines were formed on the sheet was not stable, and the productivity was further deteriorated.
In the case of Comparative Example 13 in which the height H2 and the width W2 are less than the stipulated ranges, it becomes difficult to bend the carton along the ruled line R2, the thickness of the carton in the folded state becomes large, and the carton is supplied to the folder. Was not stable, and productivity fell.
In the case of Comparative Example 14 in which the height H2 exceeds the specified range, it becomes difficult to bend the carton along the ruled line R2, the thickness of the carton in the folded state becomes large, and the supply of the carton to the folder is stabilized. Productivity was reduced. In the case of Comparative Example 14, since the width W2 also exceeded the specified range, the ruled line R2 was not curved in a straight line and could be processed into a carton, but a carton defect also occurred.

In the case of Comparative Example 11 in which the width W45 of the fourth ruled line and the fifth ruled line exceeded the specified range, the ruled lines R4 and R5 did not bend neatly and straightly, and the carton could be processed, but a carton defect occurred.
In the case of Comparative Example 11, (H45 / W45) was less than the specified range, the quality of the ruled line when the ruled line was formed on the sheet was not stable, and the productivity was further deteriorated.
In the case of Comparative Example 12 in which the height H45 of the fourth ruled line and the fifth ruled line was less than the specified range, the ruled lines R4 and R5 were difficult to bend, and the workability during carton production was poor. In the case of Comparative Example 12, H45> H67, and the adhesiveness between the inner flap and the outer flap was further deteriorated.

  If the widths of the ruled lines R4, R5, R6, and R7 exceed the specified range, the bendability with the flaps connected to these ruled lines is poor, and the linearity of the corners of these flaps is poor. If the widths of the ruled lines R11, R12, R2, and R3 exceed the specified range, the linearity of the ruled lines in the long side direction of the carton 20 is poor. In any case, if the linearity of the ruled line is inferior, a carton defect occurs.

20 carton 25 paper product 201 top surface portion 202 bottom surface portion 203 first side surface portion 204 second side surface portion 205 carton gluing portion 206, 206B upper surface side outer flap 207, 207B lower surface side outer flap 208, 208B first inner flap 209, 209B second 2 Inner flap R11, R12 First ruled line R11 First ruled line that is closer to the third ruled line R12 First ruled line that is farther from the third ruled line R2 Second ruled line R3 Third ruled line R4 Fourth ruled line R5 5th ruled line R6 6th ruled line R7 7th ruled line W45 Width of 4th ruled line and 5th ruled line H45 Height of 4th ruled line and 5th ruled line from the inner surface of the carton t45 Adjacent to 4th ruled line and 5th ruled line Carton thickness

Claims (10)

In a rectangular parallelepiped carton containing a stack of paper products,
The basis weight of the carton is 250 to 370 g / m ² , the paper thickness t is 0.28 to 0.43 mm / sheet,
The long side Lc of the carton is 200 to 250 mm, the width Wc is 100 to 130 mm, and the height Hc is 40 to 65 mm .
The ring crush value RL in the long side direction of the carton defined in JIS-P8126 is 500 to 800 N, and (RL / t) is 1.7 to 2.5 N / μm ,
The carton has a rectangular top surface portion and a bottom surface portion, a first side surface portion connected to one long side of each of the top surface portion and the bottom surface portion via a first ruled line, the top surface portion or the above. A second side surface portion connected to the other long side of the bottom surface portion via a second ruled line, and a second side surface portion connected to the other long side of the top surface portion or the bottom surface portion via a third ruled line A carton gluing portion that is connected to overlap the inner surface of the top surface, a pair of upper outer flaps that are connected to both short sides of the top surface portion via fourth ruled lines, and a fifth portion of both short sides of the bottom surface portion. A pair of lower surface side outer flaps connected via ruled lines, a pair of first inner flaps connected to both short sides of the first side surface portion via sixth ruled lines, and both of the second side surface portions. It has a pair of second inner flaps connected to the short sides through seventh ruled lines, respectively. The first ruled line to the seventh ruled line are bent, and the upper side outer flap and the lower side outer flap are opened so as to overlap the outer sides of the first inner flap and the second inner flap. ,
The width W45 of the fourth ruled line and the fifth ruled line is 1.1 to 2.2 mm, and the height H45 of the fourth ruled line and the fifth ruled line from the inner surface of the carton to the inner side is 0.23 to 0.55 mm. And
When the thickness of the carton adjacent to the fourth ruled line and the fifth ruled line is t45, (H45 (mm) / t45 (mm)) = 0.50 to 1.90
Cartons with paper products that are. The carton containing a paper product according to claim 1, wherein (H45 (mm) / W45 (mm)) = 0.10 to 0.60. Of the pair of first ruled lines, the first ruled line that is farther from the third ruled line has a width W12 of 1.0 to 2.5 mm, and the height of the first ruled lines from the inner surface of the carton to the inner side. When H12 is 0.12 to 0.42 mm and the thickness of the carton adjacent to the first ruled line is t12, (H12 (mm) / t12 (mm)) = 0.45 to 1.60 A carton containing a paper product according to claim 1 or 2. Of the first ruled lines, the first ruled line closer to the third ruled line and the second ruled line have a width W2 of 1.0 to 2.5 mm, and the first ruled line is directed inward from the inner surface of the carton. The height H2 of the second ruled line is 0.28 to 0.62 mm, and the carton containing the paper product according to any one of claims 1 to 3. The width W67 of the sixth ruled line and the seventh ruled line is 1.0 to 2.5 mm, and the height H67 of the sixth ruled line and the seventh ruled line from the inner surface of the carton to the inner side is 0.22 to 0.53 mm. The carton containing the paper product according to any one of claims 1 to 4. The carton containing a paper product according to claim 5 , wherein H45 (mm)> H67 (mm). The carton with a paper product according to any one of claims 1 to 6, wherein the carton is composed of multiple layers, and the proportion of the hard layer containing 40 to 100 mass% of softwood-derived pulp is 15 to 75 mass%. . The carton containing a paper product according to claim 7, wherein the hard layer contains waste paper derived from corrugated board. 9. The carton containing a paper product according to claim 1 , wherein the bending stiffness of the carton in the long side direction is 3.7 to 7.5 mN · m .
However, the bending stiffness is in accordance with the method described in ISO-2493, using an L & W Bending Tester (manufactured by Lorentzen & Wettre), a width of 38 mm in which the longitudinal direction of the carton 20 is aligned with the long side direction, and a length. One end side of the 100 mm test piece is fixed to the chuck of the sample table in a cantilever manner, and one surface outside the one end side of the test piece is brought into contact with the projecting engagement portion of the detection section on the sample table, and the test is performed. In the free state where the other end of the piece is not restrained, the bending length (the distance between the chuck of the sample table and the engaging portion, that is, the span (between beams) of the test piece) is set to 10 mm, and the bending angle (the test piece The angle of rotation of the chuck holding one end, the bending resistance (load) when the test piece is pressed against the engaging part during this rotation and the test piece bends 15 degrees, and Calculation formula: bending stiffness (mN · m) = 60 × bending resistance Resistance (mN) × bending length 10 (mm) ² ÷ {π × bending angle 15 (°) × sample width 38 (mm) × 1000}. The carton containing a paper product according to any one of claims 1 to 9 , wherein the compressive strength of the carton in the long side direction is 130 to 220 N / box .
However, the compression strength is the compression strength when the carton is placed on a compression tester so that the long side of the carton becomes longitudinal (axial direction) and a compression plate having an area of 177 cm 2 (circle with a diameter of 15 cm) is arranged on the carton. The surface of each of the outer flaps of the carton is completely inside the plate, and the compression plate is compressed by applying a uniaxial load under the condition of a pressurizing speed of 10 mm / min. Then, the first inflection point that appears first and has an upward convexity is used, and the values obtained 5 times under constant temperature and humidity conditions of 23 ° C. and 50% RH are averaged.