JP6684877B2 - Cartons with paper products and carton boxes - Google Patents

Description

  The present invention relates to a carton containing paper products such as tissue paper, and a carton-containing cardboard box containing the carton.

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. Further, if a carton is excessively added or coated with a starch-based or polyacrylamide-based paper strength agent, the strength is improved, but the load of wastewater treatment is increased and it is difficult to operate for a long period of time. .

  That is, the present invention, by reducing the size of the carton, adding too much paper strength agent, without significantly increasing the basis weight and paper thickness of the carton, improve the strength of the carton to prevent crushing of the carton. It is an object of the present invention to provide a carton containing suppressed paper products and a carton containing a carton.

In order to solve the above-mentioned problems, a carton containing a paper product of the present invention is a carton of a rectangular parallelepiped made of paperboard containing a laminate of paper products, the carton has a basis weight of 250 to 370 g / m ² , and a paper thickness t of 280. ~ 430 μm / sheet, the long side of the carton is 200 to 250 mm, the width is 100 to 130 mm, the height of the carton along the laminating direction of the paper product is 40 to 65 mm, and the carton defined in JIS-P8126 is used. The ring crush value RL in the long side direction is 500 to 800 N, and (RL / t) is 1.7 to 2.5 N / μm , and the ring crush value RT in the width direction of the carton is defined in JIS-P8126. Is 550 to 1,050 N and (RT / t) is 2.1 to 3.1 N / μm .

The bending stiffness of the carton in the long side direction is preferably 3.7 to 7.3 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 is aligned with the long side direction of the carton, 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, In a free state in which the other end of the test 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 The angle of rotation of the chuck holding one end of the piece, the bending resistance (load) when the test piece is pressed against the engaging portion during this rotation and the test piece bends 15 degrees, The following calculation formula: bending stiffness (mN · m) = 6 × determined bending resistance (mN) × Bending Length ^{10 (mm) 2 ÷ {π} × bending angle 15 (°) × sample width 38 (mm) × 1000}.
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 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 the outer flap of the carton is completely placed inside the plate, and the compression plate is compressed by applying a uniaxial load under the condition of a pressing speed of 10 mm / min, and in the graph of axial displacement and load, The first inflection point that appears first and has an upward convexity is set, and the values obtained 5 times under constant temperature and humidity conditions of 23 ° C. and 50% RH are averaged .
√ {(Tear strength according to JIS-P8116 (2000) in the longitudinal direction) × (Tear strength according to JIS-P8116 (2000) in the lateral direction)} of the carton is preferably 2.1 to 3.6N. .
In the height direction inside the carton, there is a gap between the laminate and the carton, and the ratio expressed by (the number of sets of the paper products in the carton) / (height of the carton) is It is preferably 2.8 to 4.3.
The hard layer preferably contains waste paper derived from corrugated board.

  The carton-containing cardboard box of the present invention is a carton-containing cardboard box in which a plurality of the carton containing the paper product is housed in a cardboard box, each of which has an outer flap and an inner flap on the upper and lower surfaces of the cardboard box. The carton is housed in a stack of two long sides along the vertical direction of the cardboard box, and the inner dimension of the cardboard box in the vertical direction is 420 to 500 mm, and the inner flap is provided on the upper surface of the carton. When brought into contact with each other, the flap gap represented by the distance between the upper surface of the inner flap and the outer flap ruled line for folding the outer flap is 1 to 18 mm.

  According to this invention, it is possible to improve the strength of the carton and reduce the crushing of the carton without reducing the size of the carton, adding excessively a paper strength agent, or significantly increasing the basis weight and the paper thickness of the carton. Can be suppressed.

It is a perspective view of a carton containing a paper product according to an embodiment of the present invention. It is a development view of a carton. It is a perspective view of the state where the upper surface of the carton housing cardboard box was opened. It is sectional drawing which follows the outer flap of a carton box containing a carton. It is a development view of a cardboard box. It is a figure which shows the measuring method of a flap gap. It is a figure which shows the measuring method of a ring crush value. 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 schematic cross section which shows the layer structure of a carton.

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. The carton 20 containing paper products (hereinafter also referred to as “carton” as appropriate) is composed of a rectangular 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 of the paper product 25 in the stacking direction. 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.

As shown in the development view 2, the carton 20 is a seat having a wide rectangular top surface portion 201 and a bottom surface portion 202, and a pair of narrow rectangular side surface portions 203 and 204 forming left and right side walls. Is assembled into a rectangular parallelepiped, and the top surface portion 201, the bottom surface portion 202, and the pair of side surface portions 203 and 204 are alternately connected via a fold line. Further, a carton gluing portion 205 is connected to one side edge of the bottom surface portion 202. Then, the carton gluing portion is adhered to the side edge of the side surface portion 204, and the sheet is bent along a predetermined ruled line (folding line), so that the top surface portion 201 and the bottom surface portion 202, and the pair of side surface portions 203 and 204 are formed into a quadrangular prism shape. It is opened.
Upper surface side outer flaps 206, 206B are connected to both end edges of the top surface portion 201, and lower surface side outer flaps 207, 207B are connected to both end edges of the bottom surface portion 202, respectively. Similarly, inner flaps 208 and 208B are connected to both end edges of the side surface portion 203, and inner flaps 209 and 209B are connected to both end edges of the side surface portion 204, respectively.
Further, the top surface portion 201 is provided with perforations 212 for taking out the paper products 25 to be contained.

  Then, after the laminated body of the paper products 25 is inserted into the box body formed in a rectangular column shape by adhering the carton gluing part 205 or the like, the inner flaps 208 and 209 which are one side surface of the opening of the box body are oppositely folded. Then, an adhesive such as hot melt or glue is applied to the outer surface (the surface of the paper product 25 that does not come into contact with the laminated body), the outer flaps 206 and 207 are folded, and the opening is sealed. Similarly, the inner flaps 208B and 209B, which are the other side surfaces of the opening of the box body, are folded opposite to each other, and the outer flaps 206B and 207B are folded on the outer side thereof to complete the closing of the opening. In this way, the carton 20 containing paper products is assembled.

The basis weight of the carton 20 is 250 to 370 g / m ² , the paper thickness t is 280 to 430 μm / sheet, the long side of the carton 20 is 200 to 250 mm, the width is 100 to 130 mm, and the height is 40 to 65 mm. The ring crush value RL in the long side direction of the carton 20 defined in P8126 is 500 to 800 N, and (RL / t) is 1.7 to 2.5 N / μm.

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 based on JIS-P8124.
When the paper thickness t of the carton 20 is less than 280 μm / sheet, the strength of the carton 20 is lowered and the carton 20 is easily crushed. If the paper thickness t of the carton 20 exceeds 430 μm / sheet, the strength of the carton 20 increases but the cost increases. The paper thickness t of the carton is preferably 280 to 380 μm / sheet, and more preferably 280 to 340 μm / sheet. The carton 20 is manufactured by raising a single sheet.
The paper thickness t of the carton 20 is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions are a measurement load of 250 gf, a gauge head diameter of 30 mm, a sheet of carton 20 placed between the gauge head and the measurement stand, and the gauge is read when the gauge head is lowered at a speed of 1 mm or less per second. The average value of the measurements repeated 10 times is taken as the paper thickness.

  When the long side L of the carton 20 is less than 200 mm, the width W is less than 100 mm, or the height H is less than 40 mm, the size of paper products such as tissue paper in the carton 20 becomes small, Since it is necessary to reduce the number of groups, the usability deteriorates. When the long side L of the carton 20 exceeds 250 mm, the width W exceeds 130 mm, or the height H exceeds 65 mm, the carton 20 becomes too large and the strength is lowered, and the carton 20 is easily crushed. The long side L of the carton 20 is preferably 200 to 240 mm, more preferably 220 to 230 mm. The width W of the carton 20 is preferably 100 to 125 mm, more preferably 110 to 120 mm. The height H of the carton 20 is preferably 42 to 55 mm, more preferably 42 to 48 mm.

Generally, when the basis weight and paper thickness of the carton are reduced, the strength of the carton 20 is reduced 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. 10, the carton 20 is composed of multilayers 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% by mass is 15 to 75% by 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.

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. 7, the compressive strength when a load F is applied in the axial direction of the test piece S1 wound in a ring shape (the lateral 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. Further, the ring crush value RT in the width direction of the carton 20 means that the long side direction of the test piece S2 is perpendicular to the width direction of the carton 20 (that is, the axial direction to which the load is applied is parallel to the width direction of the carton 20). Say.
Here, as shown in FIG. 2, since the length of the carton 20 in the long side direction is sufficiently long at 200 mm or more, the test piece S2 for measuring the ring crush value RT does not include the ruled line of the carton 20. To collect. On the other hand, since the width of the carton 20 in the width direction is 130 mm or less, the test piece S1 for measuring the ring crush value RL includes at least one ruled line RC of the carton 20. However, since the ruled line RC is in the same direction as the direction in which the test piece S1 is compressed, if the ruled line RC 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) indicates that the strength is higher even if the paper thickness t is thinner. 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 cardboard is contained in the carton 20, the content ratio of the waste paper derived from the cardboard in the pulp raw material in the carton 20 is preferably 20 to 70% by mass, more preferably 30 to 70% by mass, most preferably 40 to 60% by mass. preferable.
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 ring crush value RT is 550 to 1,050 N and (RT / t) is 2.1 to 3.1 N / μm.
If RT is less than 550 N, for example, when storing a product in which a plurality of cartons 20 are packed in a package with the top surface 201 facing upward, the side surfaces 203 and 204 of the carton 20 may be crushed. On the other hand, when RT exceeds 1,050 N, the strength may be increased more than necessary and the cost may be increased.
When (RT / t) is less than 2.1, for example, when storing a product in which the carton 20 is packaged in plural so that the top surface 201 faces upward, the side surfaces 203 and 204 of the carton 20 are crushed. There are cases. On the other hand, if (RT / t) exceeds 3.1, the strength becomes high, but the carton becomes too hard, and it is difficult to form ruled lines, and the carton moldability may be poor.
The RT is more preferably 700 to 1,050 N, most preferably 800 to 1,050 N.
(RT / t) is more preferably 2.3 to 3.1 N / μm, and most preferably 2.5 to 3.1 N / μm.

It is preferable that the bending stiffness SL in the long side direction of the carton 20 is 3.7 to 7.3 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 7.3 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 135 to 190 N / box, and most preferably 140 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 compression plate, and the first inflection that appears first 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 for defining the compressive strength in the long side direction of the carton 20 is that, when the carton 20 is housed in the corrugated board 10 as shown in FIG. At that time, 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 √ {(longitudinal tear strength) × (horizontal tear strength)} of the carton 20 is 2.1 to 3.6N.
If the √ {(longitudinal tear strength) × (horizontal tear strength)} of the carton 20 is less than 2.1 N, the carton may be torn when the paper product laminate is inserted into the carton. Yes (break during manufacturing). If it exceeds 3.6 N, the strength may be increased more than necessary and the cost may be increased. √ {(Tear strength in the longitudinal direction) × (Tear strength in the lateral direction)} is preferably 2.1 to 3.2N, more preferably 2.1 to 2.6N.
The tear strength in the machine direction and the transverse direction of the carton 20 is measured according to JIS-P8116 (2000). Further, the longitudinal direction and the lateral direction are the MD and CD directions of the sheet of the carton 20, respectively.
In addition, {square root tear strength} × (horizontal tear strength)} is appropriately referred to as “tear strength”.

  The ratio T expressed by (the number of sets of paper products in the carton 20) / (height H of the carton 20) is preferably 2.8 to 4.3. If the ratio T is less than 2.8, the tissue paper in the carton 20 is small, the gap in the carton becomes large, the carton is difficult to maintain its shape, and the carton may be easily crushed. On the other hand, when the ratio T exceeds 4.3, there is a large amount of tissue paper in the carton 20, the gap in the carton becomes small, and the tissue may not be taken out easily (it becomes difficult to take out the tissue paper from the carton). . The ratio T is preferably 3.3 to 3.9.

  When the number of sets of paper products in the carton 20 is 150 to 200, the frequency of replacement of the tissue paper does not become too high and the cost does not become too high, so that the balance between the number of sets and the cost becomes preferable. If the number of sets is less than 150, the number of sets may be small, the tissue paper in the carton may be used up immediately, and the replacement frequency may increase. On the other hand, if the number of sets exceeds 200, the cost of the paper products in the carton 20 may increase. The number of sets of paper products is more preferably 160 to 180 and even more preferably 160 to 170.

Next, the carton-containing cardboard box 100 according to the embodiment of the present invention will be described. FIG. 3 is a perspective view showing a state where the upper surface of the carton-containing cardboard box 100 is opened, and FIG. 4 is a sectional view taken along the outer flap of the carton-containing cardboard box 100. The carton-containing cardboard box 100 includes a plurality of cartons 20 containing paper products contained in the cardboard box 10. The cardboard box 10 has a pair of outer flaps 2 and a pair of inner flaps 4 on the upper and lower surfaces, respectively, and the carton 20 is housed in the cardboard box 10 by stacking the long sides in two steps along the vertical direction U. ing.
As shown in FIG. 5, the cardboard box 10 includes four body portions 6 divided by vertical folding ruled lines R3, R3, and R3, and two outer flap ruled lines that are horizontally folded above and below the two body portions 6 separated from each other. It has an outer flap 2 connected to each other via R1 and an inner flap 4 connected to each other via two horizontally folded inner flap ruled lines R2 above and below another two body portions 6. A cutting line C is inserted between the outer flap 2 and the inner flap 4 which are adjacent to each other, and the respective flaps 2 and 4 are separated. A glue margin panel 6f is provided at the end of the outermost body portion 6, and the glue margin panel 6f is adhered to the outer surface or the inner surface of the body portion 6 on the other end side to form the body portion 6 in a rectangular column shape. It will be boxed.

Then, after a pair of inner flaps 4 on the lower side (bottom surface side) of the cardboard box 10 are valley-folded inward at inner flap ruled lines R2, a pair of outer flaps 2 at the lower side are similarly inward at outer flap ruled lines R1. It is valley-folded and the seam between the outer flaps 2 is fixed with tape or an adhesive to form the bottom surface. Alternatively, the bottom surfaces of the pair of inner flaps 4 (surfaces on the outer flap 2 side) and the upper surfaces of the pair of outer flaps 2 (surfaces on the inner flap 4 side) may be fixed by hot melt to form the bottom surfaces.
When fixing with hot melt, the ratio of the area of the pair of outer flaps 2 to the area of the pair of inner flaps 4 is preferably 1.1 to 2.0. When the above ratio exceeds the above range, the area of the outer flap 2 becomes too large with respect to the area of the inner flap 4, and the portion (glue allowance) where the adhesive for hot melt is applied becomes small, so that the flap cannot be fixed well. There is. On the other hand, when the above ratio is less than the above range, the corrugated board becomes extremely close to a square (when the above ratio is 1.0, it becomes a square), and the carton storage form is limited. In addition, the area of the flap becomes large, which may increase the cost. The ratio of the area of the outer flap 2 to the area of the inner flap 4 is preferably 1.1 to 1.8, more preferably 1.2 to 1.6, and even more preferably 1.2 to 1.4.

Next, after the carton 20 is accommodated from the top opening of the cardboard box 10, the inner flap 4 and the outer flap 2 on the upper surface side are folded inward in the same manner as described above, and the seam between the outer flaps 2 is fixed to fix the carton. The storage cardboard box 100 can be manufactured.
Here, when the outer flaps 2 that face each other are put together, they become a butt, and the total width of the outer flaps 2 substantially matches the width of the cardboard box 10 and forms the bottom surface and the top surface of the cardboard box 10. On the other hand, even if the inner flaps 4 facing each other are not butt-matched, the total length of the inner flaps 4 becomes shorter than the length in the longitudinal direction of the cardboard box 10, and a step is generated between the inner flaps 4 facing each other. . In the case of the inner flaps 4 that do not butt like this, when a plurality of carton boxes 100 are stacked as described above, the lower carton boxes may be crushed by the weight, and the inner carton may also be crushed.
Therefore, the present invention is directed to a cardboard box 10 having an inner flap 4 that does not butt.

The inner dimension IL (see FIG. 3) of the cardboard box 10 in the vertical direction is 420 to 510 mm, and the flap gap D (see FIG. 6) described below is 1 to 18 mm.
If the inner dimension IL is less than 420 mm, the long side L of the carton 20 that is housed in two layers in the corrugated cardboard box 10 is also less than 210 mm, and the size of paper products such as tissue paper in the carton 20 is small. It becomes smaller and the number of sets of paper products needs to be reduced, which reduces the usability.
On the other hand, when the inner dimension IL exceeds 500 mm, the long side L of the carton 20 accommodated in the corrugated cardboard box 10 also exceeds 250 mm and becomes large, and when a plurality of carton-containing corrugated cardboard boxes 100 are stacked, the corrugated cardboard box 10 on the lower side is The carton 20 inside is easily crushed due to the weight. The inner size IL is preferably 420 to 490 mm, more preferably 450 to 470 mm.

The flap gap D folds the upper surface 4a of the inner flap 4 and the outer flap 2 when the inner flap 4 is brought into contact with the upper surface 20a of the carton 20 in a state in which the carton 20 is housed in the cardboard box 10 in a two-tiered manner. Is represented by the distance from the outer flap ruled line R1. When the flap gap D is less than 1 mm, the inner flap 4 is constantly in contact with the upper surface of the carton 20 and presses the same, which may cause the carton 20 to be easily crushed. When the flap gap D exceeds 18 mm, the upper space between the upper surface of the carton 20 and the cardboard box 10 becomes too large, and the lower cardboard box 10 is crushed by the weight so as to compress the upper space and the side surface bulges. Bulging may occur, and the cardboard box 10 and the carton 20 inside thereof may be easily crushed. The flap gap D is more preferably 1 to 10 mm, even more preferably 2 to 5 mm.
The flap gap D is measured as shown in FIG. First, a weight (mass 100 g, diameter 28 mm, pressure 1.59 kPa) is placed on the upper surface 4a of the corner of the inner flap 4, and the lower surface of the inner flap 4 is brought into contact with the upper surface 20a of the carton 20. At this time, the distance (height) from the upper surface 4a of the inner flap 4 to the outer flap ruled line R1 is measured and defined as the flap gap D. The position (height) of the outer flap ruled line R1 is the apex when the outer flap 2 is folded so as to contact the outer surface of the cardboard box 10. Further, the fact that the flap gap D is minus means that the upper surface 4a of the inner flap 4 is located above the outer flap ruled line R1 in FIG.

  If the number of cartons 20 to be accommodated in the cardboard box 10 is set to 40 to 100, the cartons 20 will not be accommodated too much and the cartons 20 will not be crushed, and a large number of cartons 20 can be accommodated in one cardboard box, thus improving the transportation efficiency. To do. The number of cartons 20 accommodated in the cardboard box 10 is more preferably 50 to 80 and even more preferably 60 to 80.

The structure of the corrugated board (sheet) that constitutes the corrugated board box 10 is a known structure in which front and back liners and a core having corrugated steps sandwiched between the liners are laminated with an adhesive or the like. Structures can be used. A step is called a flute, and for example, an A flute (step height is 4.5 to 4.8 mm, 34 peaks per 30 cm, step take rate 1.6), B flute (step height is 2.5 to 2.8 mm, 50 peaks per 30 cm, rung rate 1.4), C flute (step height 3.5 to 3.8 mm, 40 peaks per 30 cm, rung rate 1.5), etc. There is. Among the A flute, B flute, and C flute, the intensities are in the order of A flute> C flute> B flute. The type of flute is not particularly limited, but A flute and C flute are preferable, and C flute is more preferable. If the strength is higher than that of the A flute, the cost of the corrugated board may increase. On the other hand, when the strength is lower than that of the B-flute, the cardboard box or carton may be easily crushed. In each flute, the step height, the number of peaks per 30 cm, and the step repeat rate may be changed as appropriate.
Further, as the material of the cardboard box, a known one can be used.

  As the liner, a kraft liner mainly made of kraft pulp, a liner mainly made of waste paper, and the like are preferably used. The core preferably uses recycled paper as a main raw material. Further, a core may be used for the back liner. The raw material for the liner and the core is not limited, but it is preferable to use recycled paper for the liner. Craft liners are strong, but can be costly. Further, as the core, a reinforced core having increased strength may be used. When the reinforced core is used, the basis weight can be reduced as compared with the normal core.

The basis weight of the liner is preferably 140 to 200 g / m ² . If the basis weight of the liner exceeds 200 g / m ² , the cost may increase. On the other hand, when the basis weight of the liner is less than 140 g / m ² , the strength of the cardboard box becomes weak and the carton and the cardboard box may be easily crushed. The basis weight of the liner is more preferably ^{150~180g / m 2, 160~170g / m} 2 is most preferred.
The basis weight of the core is preferably 100 to 200 g / m ² . If the basis weight of the core exceeds 200 g / m ² , the cost may increase. On the other hand, when the basis weight of the core is less than 100 g / m ² , the strength of the cardboard box becomes weak and the carton or the cardboard box may be easily crushed. The basis weight of the corrugated medium is more preferably 110~180g / ^{m 2,} and most preferably 120-150 g / ^{m 2.}

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, in the above example, the cardboard box is a one-piece sheet provided with ruled lines and cutting lines, but a three-piece sheet may be used.
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 containing tissue paper (paper products: the number of groups shown in Tables 1 and 2) laminated in a pop-up type is prepared, and five cartons are stacked in the height direction to form a film. The packed product was housed in a cardboard box 10 shown in FIG. 3, and the flaps 2 and 4 on the upper surface were sealed to obtain a carton-containing cardboard box 100. Tables 1 and 2 show specifications of the cardboard box 10 and various dimensions of the cardboard box 10 and the carton 20.
Carton basis weight, paper thickness, compressive strength (longitudinal direction), ring crush value, bending stiffness in long side direction, tear strength (√ {(longitudinal tear strength) x (horizontal tear strength)} ) Was measured as described above.
The carton had a total of 6 layers, of which 3 were hard layers. However, in Examples 2, 3 and 4, the hard layers were 1 layer, 2 layers and 4 layers respectively, and in Comparative Examples 1 and 10, the hard layers were 1 layer and 5 layers respectively and the basis weight of each layer was changed. For example, in Example 1, the hard layer was 3 layers out of the 6 layers, and the basis length of each layer was the same, so the ratio of the hard layer was 50% by mass. Further, in Comparative Example 2, the hard layer is 3 out of 6 layers, but the grammage of the hard layer is lower than the grammage of the other layers, and when the grammage is taken into consideration, the ratio of the hard layer is 40 mass. It became%. In addition, the carton was immersed in water at room temperature for 30 minutes, each layer was peeled off, and then the composition and basis weight of each layer were measured.
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.

  In addition, 10 carton-containing cardboard boxes 100 were stacked and stored for 1 week, and the presence or absence of bulging of the lowermost carton-containing cardboard box 100 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 lowermost carton-containing cardboard box 100 was opened and the presence or absence of collapse of the carton was visually determined.
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.
Furthermore, the presence or absence of breakage of the carton when the tissue laminate was inserted into the carton was evaluated.
In each 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.

  In addition, the size of the tissue paper (paper product), the balance between the number of sets in the carton 20 and the cost, and the take-out property were 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. Note that if the number of sets in the carton becomes too small, the tissue paper in the carton will be used up immediately and the replacement frequency will increase, so the balance between the number of sets and cost will be poor, and the number of sets in the carton will increase. If too much, the tissue paper cost will increase, and the balance between the number of sets and the cost will also deteriorate.

  The obtained results are shown in Tables 1 and 2.

  As is clear from Table 1 and Table 2, each example in which the basis weight of the carton, the paper thickness t, the ring crush value RL, (RL / t), the long side L, the width W, and the height H were set in the predetermined ranges. In the case of, it was possible to suppress the collapse of the carton by improving the strength of the carton without significantly increasing the basis weight and the paper thickness of the carton while maintaining the feeling of use without reducing the size of the carton. .

On the other hand, in the case of Comparative Examples 1 to 4 in which the basis weight of the carton, the paper thickness t, the compressive strength (longitudinal direction), RL, (RL / t) are less than the specified range, the strength of the carton decreases and the carton collapses. A tear occurred during the manufacture of the carton.
In the case of Comparative Example 1 in which the proportion of the hard layer in the carton is less than 15% by mass and the proportion of the softwood pulp in the hard layer is less than 40% by mass, the proportion of the hard layer and the proportion of the softwood pulp in the hard layer. The carton was more crushed than that of Comparative Example 2 in which the value was within the specified range. Further, in the case of Comparative Example 1 in which RT is less than 550 N and (RT / t) is less than 2.1 N / μm, the carton 20 is stored in a five-pack product with the top surface portion 201 facing upward. At that time, the side surfaces 203 and 204 of the carton 20 were crushed.
Further, in the case of Comparative Example 3 in which the flap gap D exceeded 15 mm, the bulging of the corrugated board box occurred more than in Comparative Example 2 in which the flap gap D was 15 mm or less.
Further, in the case of Comparative Example 4 in which the flap gap D was less than 1 mm, the carton was more significantly crushed than in Comparative Example 2 in which the flap gap D was 1 mm or less.

  In the case of Comparative Example 5 in which the basis weight, the paper thickness, and the RL of the carton exceeded the predetermined ranges, the strength of the carton was increased and the carton was not crushed, but the cost was increased and it was difficult to bend the carton at the time of disposal. .

  In the case of Comparative Example 6 in which the basis weight, paper thickness, and RL of the carton are less than the specified ranges, and the long sides, widths, and heights of the carton exceed the specified ranges, the strength of the carton decreases and the carton collapses, A tear occurred during the manufacture of the carton. Further, in the case of Comparative Example 6, the ratio T represented by (the number of sets of paper products) / (height H of carton) is less than 2.8, and the number of sets of paper products in the carton 20 is small, The inner gap became large and the carton was difficult to maintain its shape, and the carton collapsed. In addition, the number of tissue groups was reduced and the balance between the number of groups and cost was poor.

  In the case of Comparative Example 7 in which the basis weight of the carton, the paper thickness, and the RL are less than the specified ranges, and the ratio T represented by (the number of sets of paper products) / (height H of the carton) exceeds 4.3. , The strength of the carton was lowered, the carton was crushed, and the carton was torn during manufacturing. In addition, the tissue paper in the carton 20 was large, and the gaps in the carton were small, so that the tissue could not be taken out easily (it was difficult to take out the tissue paper from the carton).

  In the case of Comparative Example 8 in which the basis weight of the carton, the paper thickness, and the RL are less than the specified ranges and the number of paper product groups in the carton 20 exceeds 200, the strength of the carton decreases and the carton collapses, A tear occurred during the manufacture of the carton. In addition, the number of sets of paper products in the carton 20 exceeds 200, the cost of the paper products in the carton increases, and the balance between the number of sets and cost is poor.

In the case of Comparative Example 9 in which the basis weight, paper thickness, and RL of the carton are less than the specified ranges, and the long sides, widths, and heights of the cartons are less than the specified ranges, the strength of the carton decreases, and the carton collapses, A tear occurred during the manufacture of the carton. Further, in the case of Comparative Example 9, the size of the tissue paper contained in the carton was small, and the number of sets was less than 150, resulting in poor balance between the number of sets and the cost.
In the case of Comparative Example 10 in which Rl and (RL / t) exceeded the specified range, the strength of the carton was high and the carton was not crushed, but it was difficult to form the ruled lines during the production of the carton and the formability was poor, and the carton was discarded. It became difficult to bend the carton. Further, since the ratio of the hard layer in the carton exceeds 75% by mass in order to increase the strength, it is difficult to insert the ruled lines during the production of the carton. In the case of Comparative Example 10, the hard layer contained a large amount of softwood pulp, so that the cost did not increase as in Comparative Example 5.
In the case of the commercially available product 1 and the commercially available product 2 in which the basis weight and paper thickness of the carton exceeded the specified range and the (RL / t) was less than the specified range, the cost of the carton was high and the folding property at the time of disposal was also poor.

2 Outer flap 4 Inner flap 10 Cardboard box 20 Carton 25 Paper product 100 Carton containing cardboard box L Carton long side W Carton width H Carton height U Carton box vertical direction IL Cardboard box vertical dimension D flap gap

Claims (8)

In a rectangular carton made of paperboard containing a stack of paper products,
The basis weight of the carton is 250 to 370 g / m ² , the paper thickness t is 280 to 340 μm / sheet,
The long side of the carton is 200 to 250 mm, the width is 100 to 130 mm, the height of the carton along the stacking direction of the paper products is 40 to 65 mm,
The ring crush value RL in the long side direction of the carton defined by JIS-P8126 is 500 to 800 N, and (RL / t) is 1.7 to 2.5 N / μm ,
A carton containing a paper product having a ring crush value RT in the width direction of 550 to 1,050 N and an (RT / t) of 2.1 to 3.1 N / μm defined in JIS-P8126 . 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 7.3 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 is aligned with the long side direction of the carton, 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, In a free state in which the other end of the test 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 The angle of rotation of the chuck holding one end of the piece, the bending resistance (load) when the test piece is pressed against the engaging portion during this rotation and the test piece bends 15 degrees, The following calculation formula: bending stiffness (mN · m) = 6 × determined bending resistance (mN) × Bending Length ^{10 (mm) 2 ÷ {π} × bending angle 15 (°) × sample width 38 (mm) × 1000}. The carton containing a paper product according to claim 1 or 2, wherein the carton has a multi-layer structure, and the hard layer containing 40 to 100% by mass of pulp derived from softwood occupies 15 to 75% by mass. The carton containing paper products according to any one of claims 1 to 3, 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 the outer flap of the carton is completely placed inside the plate, and the compression plate is compressed by applying a uniaxial load under the condition of a pressing speed of 10 mm / min, and in the graph of axial displacement and load, The first inflection point that appears first and has an upward convexity is set, and the values obtained 5 times under constant temperature and humidity conditions of 23 ° C. and 50% RH are averaged. The √ {(tear strength according to JIS-P8116 (2000) in the longitudinal direction) × (tear strength according to JIS-P8116 (2000) in the lateral direction)} of the carton is 2.1 to 3.6N. A carton containing the paper product according to any one of to 4. In the height direction inside the carton, there is a gap between the laminate and the carton,
The paper according to any one of claims 1 to 5 , wherein a ratio represented by (the number of sets of the paper products in the carton) / (height of the carton) is 2.8 to 4.3. Product carton. The carton containing a paper product according to any one of claims 1 to 6 , wherein the hard layer contains waste paper derived from corrugated board. A carton-containing corrugated box in which a plurality of cartons containing the paper product according to any one of claims 1 to 7 are housed in a corrugated box.
  Each has an outer flap and an inner flap on the upper and lower surfaces of the cardboard box,
  The carton is accommodated by stacking the long sides in two stages along the vertical direction of the cardboard box,
  The inner dimension of the cardboard box in the vertical direction is 420 to 500 mm,
  When the inner flap is brought into contact with the upper surface of the carton, a carton-containing cardboard box having a flap gap represented by a distance between an upper surface of the inner flap and an outer flap ruled line for folding the outer flap is 1 to 18 mm. .

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