JP2016124598A - Paper product-containing carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper product-containing carton capable of properly setting easiness-to-cut of an opening perforation for taking out a laminate, even if basis weight and a paper thickness of a carton are low.SOLUTION: In a paper rectangular solid-shaped carton 20 for storing a laminate of a paper product 25, basis weight of the carton is 250-370 g/m, and a plate thickness (t) is 0.28-0.43 mm/sheet, and an opening perforation 210 is formed for forming a takeout port on a top surface 201 of the carton, and the opening perforation comprises two long side parts 210L1 and 210L2 and two short side parts 210W respectively connected to both end of the two long side parts, and 50% or more of the length of the long side parts is composed of double or more of perforations, and on the perforation being the longest in a cutting line among the short side parts, in a part of 50% or more of the length of the short side parts, the length of a cutting line n1 is 7-35 mm, and the length of a connection part c1 between the adjacent cutting lines n1 is 0.70-1.40 mm, and is also (the length (mm) of the connection part c1)/(a paper thickness (mm))=t2.0-4.0.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a carton containing paper products such as tissue paper.

Paper products such as tissue paper are boxed in a paper carton, and the cartons are packed and stored in a cardboard box. At this time, since a plurality of cardboard boxes are stored in a stacked state, the lower cardboard boxes may be crushed by weight, and the inner carton may also be crushed. When the carton is crushed, it looks inferior and becomes defective. In view of this, a technique has been developed in which the inner flap of the cardboard box is crushed in the thickness direction, and the inner flap is prevented from colliding with the carton to suppress the carton from being crushed (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.
On the other hand, in order to take out a paper product from a carton, an opening perforation is formed on the top surface of the carton, and a technique for making the perforation easy to open by doubleting this perforation has been developed (Patent Document 2).

JP 2002-87423 A Japanese Patent Laid-Open No. 2004-1790

However, in the case of the technique described in Patent Document 1, it is necessary to change the manufacturing process of the cardboard box, and it may not be applicable to a general cardboard box, and may lack generality.
In addition, if the carton is downsized, the size of the paper product such as tissue paper contained in the carton becomes smaller or the number of paper products needs to be reduced, and the paper product in the carton is used up quickly. There is a problem that the exchange frequency becomes high.
Therefore, as a method for increasing the strength of the carton without reducing the size of the carton, it is possible to increase the basis weight or paper thickness of the carton, but this increases the cost. In addition, when the basis weight or paper thickness of a carton becomes high, it becomes difficult to bend the carton small when discarding a carton that has used up a paper product. On the other hand, when the basis weight or paper thickness of the carton is lowered, the strength is lowered, and it becomes difficult to suppress the carton from being crushed, and the carton is broken at the time of production to lower the productivity.

For this reason, it is necessary to reduce the basis weight and paper thickness of the carton in order to reduce costs. However, if the basis weight and paper thickness of the carton are reduced, the opening perforation tends to be cut carelessly. When the carton is folded, the sheet is broken during box production, or the carton is broken from the opening perforation during storage by putting the carton after production into cardboard. This is because the carton becomes thinner when the basis weight is lowered. As a measure for securing strength even when the basis weight or paper thickness is low, if the carton has a multilayer structure including a hard layer as will be described later, the carton strength is increased and the perforation is difficult to break. In some cases, the perforation for opening becomes easier to break.
On the other hand, if the perforated part of the perforation is lengthened, the sheet is hardly torn during the production of the carton, but it is difficult to open the sheet neatly at the perforation. As described above, when the basis weight or paper thickness of the carton is lowered, it is difficult to appropriately set the perforation ease by simply adjusting the lengths of the perforated portion and the cut line. .

  That is, the present invention provides a carton containing a paper product that can appropriately set the ease of opening of the opening perforation that forms the take-out port for taking out the laminate, even if the basis weight or paper thickness of the carton is low. Objective.

As a result of studies by the present inventors, when the basis weight of the carton or the paper thickness is lowered, the ease of perforation is set appropriately by simply adjusting the length of the perforated part of the perforation and the cut line. It has been found that it is difficult to set the relationship between the thickness of the carton and the perforation as the carton becomes thinner. In addition, paying attention to opening the opening perforation from the short side first, it has been found that it is important to set the ease of perforation of the short side.
That is, in order to solve the above-mentioned problem, the carton containing paper products of the present invention is a paper rectangular parallelepiped carton containing a laminate of paper products, and the basis weight of the carton is 250 to 370 g / m ² , paper thickness t. Is an opening perforation for forming a take-out port for taking out the laminate on the top surface of the carton and is completely separated from the carton. The opening perforations are respectively two long side portions along the longitudinal direction of the carton and short side portions along the width direction of the carton, and both ends of the two long side portions. Two short sides connected to each other, and 50% or more of the length of the long side consists of double or more perforations, and the perforation having the longest cut line among the short sides About 50% of the length of the short side The upper part has a length of the cut line n1 of 7 to 35 mm, a length of the jumper part c1 between the adjacent cut lines n1 of 0.70 to 1.40 mm, and (of the jumper part c1 Length (mm)) / (paper thickness t (mm)) = 2.0 to 4.0.

Of the two or more perforations in the long side portion, when the perforation closest to the perforation in the short side portion is the inner perforation Ri, (the length of the cut line n1 in the short side portion) (Mm))> (length (mm) of the cut line n2 of the inner perforation Ri of the long side portion).
Of the two or more perforations in the long side portion, when the perforation closest to the perforation in the short side portion is the inner perforation Ri (the number of the cut lines n1 in the short side portion) ) <(Number of cut lines n2 of the inner perforation Ri of the long side portion).
It is preferable that 50% or more of the length of the short side portion is a single perforation.
In the short side portion, the number of the cut lines n1 is preferably 1 to 10.

Of the two or more perforations in the long side portion, when the perforation closest to the perforation in the short side portion is the inner perforation Ri, the length of the collar portion c2 of the inner perforation Ri is It is preferable that the length is 0.50 to 1.20 mm and (the length (mm) of the protruding portion c2) / (the paper thickness t (mm)) = 1.5 to 3.5.
Of the two or more perforations in the long side portion, when the perforation closest to the perforation in the short side portion is the inner perforation Ri, the length of the cut line n2 of the inner perforation Ri Is 0.70 to 1.40 mm, and (the length (mm) of the cut line n2) / (the length (mm) of the joint portion c2 of the inner perforation Ri) = 0.90 to 2.00 It is preferable that

Among the two or more perforations on the long side, the perforation closest to the perforation on the short side is the inner perforation Ri, and the perforation is located on the outer side adjacent to the inner perforation Ri. Is the outer perforation Ro, the length of the crevice portion c3 between the adjacent cut lines n3 is 0.80 to 1.60 mm in the outer perforation Ro, and (of the crevice portion c3 Length (mm)) / (paper thickness t (mm)) = 1.7 to 4.6 is preferable.
Among the two or more perforations on the long side, the perforation closest to the perforation on the short side is the inner perforation Ri, and the perforation is located on the outer side adjacent to the inner perforation Ri. Is the outer perforation Ro, the length of the cut line n3 is 0.35 to 1.00 mm, and (the length of the cut line n3 (mm)) / (adjacent) It is preferable that the length (mm) of the protruding portion c3 between the cut lines n3 to be = 0.30 to 0.80.

  A side perforation for disassembling the carton is formed on a side surface of the carton along the width direction, and the disassembling perforation crosses the width direction to apply a finger. The arcuate part has a length of the cut line n4 of 3 to 20 mm, a length of the jumper part c4 between the adjacent cut lines n4 of 0.8 to 2.5 mm, The cutting lines n4 are arranged 2 to 10 apart from each other, and (the length of the above-mentioned claw portion c4 (mm)) / (the paper thickness t (mm)) = 2.8 to 6.0. preferable.

It is preferable that the carton is composed of multiple layers, and the ratio of the hard layer containing 40 to 100% by mass of the coniferous pulp is 15 to 75% by mass.
The hard layer preferably contains used paper derived from corrugated cardboard.
It is preferable that the ring crush value RL in the long side direction of the carton specified in JIS-P8126 is 500 to 800 N and (RL / t) is 1.7 to 2.5 N / μm.
The bending stiffness in the long side direction of the carton is preferably 3.7 to 7.5 mN · m.
The compressive strength in the long side direction of the carton is preferably 130 to 220 N / box.

  According to this invention, even if the basis weight or paper thickness of the carton is low, it is possible to appropriately set the ease of opening the opening perforation for forming the take-out port for taking out the laminate.

1 is a perspective view of a carton containing a paper product according to an embodiment of the present invention. It is a see-through | perspective perspective view which shows each component of the carton containing paper products. It is an expanded view of a carton. It is a partial top view which shows the structure of the opening perforation for forming an extraction port. It is a partial top view which shows the structure of the perforation for dismantling for dismantling a carton. 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 relationship of the displacement and load of an axial direction obtained by the measurement of compressive strength. It is a figure which shows the evaluation method of the bendability of the carton at the time of disposal. It is a partial top view which shows the structure of another embodiment of the opening perforation for forming a taking-out port. It is a partial top view which shows the structure of another embodiment of the opening perforation for forming a taking-out opening. It is a partial top view which shows the structure of another embodiment of the disassembling perforation for dismantling a carton. It is a figure which shows the state which the perforation cuts at the time of manufacture or storage of a carton, the site | part fell below, and was opened carelessly. It is a figure which shows the state by which the surface layer of the carton surface of the perforated part of the perforation was pulled to the outside at the time of opening, and it was turned up and torn. It is a figure explaining the difference in the intensity | strength of a single perforation and a double or more perforation.

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 components of the carton 20 containing paper products, and FIG. The carton 20 with a paper product (hereinafter also referred to as “carton” as appropriate) is a paper rectangular box containing a laminate of sheet-like paper products 25, and the height Hc of the carton 20 with a paper product is The height along the stacking direction of the internal paper product 25. Examples of the paper product 25 include tissue paper and hand towels, and the individual paper products 25 may be stacked by being Z-folded or V-folded in a pop-up manner, for example, or may be stacked so as not to pop up. . The carton 20 can be formed from paperboard or the like.

As shown in FIGS. 2 and 3, the carton 20 with a paper product includes a rectangular top surface portion 201 and a bottom surface portion 202 opposite to the rectangular top surface portion 201, and each of the top surface portion 201 and the bottom surface portion 202 (see FIG. 2). The first side surface portion 203 connected to the long side (on the right side), the second side surface portion 204 connected to the other long side (on the left side in FIG. 2), and the other side surface of the bottom surface portion 202 (see FIG. 2). 2, a carton glued portion 205 connected to the long side of the second side surface portion 204 and connected to the inner surface of the second side surface portion 204, and a pair of upper surface side outer flaps 206 respectively connected to both short sides of the top surface portion 201. 206B, a pair of lower side outer flaps 207, 207B connected to both short sides of the bottom surface 202, and a pair of first inner flaps 208, 208B connected to both short sides of the first side surface 203, respectively. Both short sides of the second side surface portion 204 One sheet having respectively connected pair of second inner flap 209,209B (see FIG. 3) to have been formed by Okoshihako by bending a predetermined border. Each ruled line is a fold line in which the sheet is crushed so that the sheet is beautifully bent when the sheet is opened and assembled into a three-dimensional shape.
An opening perforation 210 for forming a take-out port for taking out the paper product 25 to be stored is provided at the center of the top surface portion 201. Further, the upper surface side outer flaps 206 and 206B are provided with disassembling perforations 220 for disassembling the carton. The top surface portion 201 corresponds to the “top surface of a carton” in the claims.

Here, when manufacturing the carton 20, first, the top surface portion 201, the bottom surface portion 202, and the pair of side surfaces are bonded by adhering the carton glue portion 205 to the side edge in the long side direction of the second side surface portion 204. The parts 203 and 204 are opened in a quadrangular prism shape.
Then, after the laminated body of the paper products 25 is inserted into the box body formed into a quadrangular prism shape by bonding the carton pasting portion 205 with hot melt or glue, the first inner flap serving as one side surface of the opening of the box body 208, the second inner flap 209 is folded oppositely, and the upper surface side outer flap 206 and the lower surface side outer flap 207, which are coated with an adhesive such as hot melt or glue, are folded on the outside 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 folded oppositely, and the upper surface side outer flap 206B and the lower surface side outer flap 207B are folded on the outside to open the opening. Is closed. In this way, the carton 20 with 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 side surfaces. The side surface portion of the carton 20 constituted by the upper surface side outer flap 206 (206B) and the lower surface side outer flap 207 (207B) corresponds to the “side surface along the width direction of the carton” in the claims.

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 lowered and the carton 20 is easily crushed. If 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 t of the carton 20 is less than 0.28 mm / sheet, the strength of the carton 20 is lowered and the carton 20 is easily crushed. When the paper thickness t of the carton 20 exceeds 0.43 mm / sheet, the strength of the carton 20 increases, but the cost increases. The paper thickness t of the carton is preferably 0.28 to 0.38 mm / sheet, and more preferably 0.28 to 0.34 mm / 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 and a probe diameter of 30 mm. A sheet of carton 20 is placed between the probe and the measurement table, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. The average value of measurements repeated 10 times is taken as the paper thickness.

Next, the structure of the opening perforation 210, which is a characteristic part of the present invention, will be described with reference to FIG. Since the opening perforation 210 is bilaterally symmetrical at the center portion Ce in the longitudinal direction L of the carton 20, only the opening perforation 210 on the right side of the center portion Ce is shown in FIG. Illustration of 210 is omitted.
The opening perforation 210 is oval as a whole and is completely cut off from the carton 20 to form an outlet. Here, “completely cut off from the carton 20” is formed between the flap and the top surface portion 201 when the flap remains on the carton 20 side and covers the periphery of the take-out port even after the take-out port is formed. This means that the perforated perforations are excluded from the definition of the present invention. An example of the flap will be described later with reference to FIG.
The opening perforation 210 includes two long side portions 210L1 and 210L2 arranged along the longitudinal direction L of the carton 20, and two short side portions 210W (1 in FIG. 4) along the width direction W of the carton 20, respectively. And a closed curve (closed curve) surrounded by the long side portions 210L1, 210L2 and the short side portions 210W.

Each long side portion 210L1, 210L2 is substantially linear, and 50% or more of the length of each long side portion 210L1, 210L2 is a double or more perforation (in FIG. 4, the inner perforation Ri and the outer perforation Ro). A double perforation). Here, “50% or more of the length of the long side portion” means that 50% or more of each length of each of the long side portions 210L1 and 210L2 is composed of double or more perforations. In other words, when one long side portion is completely (100% of the length) made up of two or more perforations and the other long side portion is made of a single perforation, “50 of the length of the long side portion”. % Or more.
Here, the perforation is configured so that the cut lines and the jumper portions are alternately arranged, the cut lines are cut lines, the hook portions remain without being cut, and the hook portions are cut. Opened.
The “single perforation” refers to a structure in which each cut line and the hook portion are arranged on the same straight line or curve.
“Double or more perforations” means that single perforations are arranged at two or more different positions from the center of the top surface portion 201 toward the outside. In addition, each cut line is arranged in the same straight line or curved line, and each tabular part is arranged in the same straight line or curved line at a position different from each cut line from the center of the top surface part 201 to the outside ( A double perforation portion 410w) of FIG. 11 to be described later also corresponds to “double or more perforations”.

  Each short side portion 210W is connected to both ends of the two long side portions 210L1 and 210L2 while being bent outwardly in a convex manner, and has a substantially U shape that expands toward the center in the longitudinal direction L. The perforation of the short side portion 210W is a single perforation, the length of the cut line n1 is 7 to 35 mm, and the length of the joint portion c1 between the adjacent cut lines n1 is 0.70 to 1 40 mm, and (length of the claw portion c1) / (paper thickness t) = 2.0 to 4.0.

Here, the boundary Re between the long side portions 210L1 and 210L2 and the short side portion 210W1 is the length LY of 1/10 of the length LX in the longitudinal direction L of the opening perforation 210. A position extending from both ends in the longitudinal direction L (only the right end is shown in FIG. 4) toward the center.
Moreover, in FIG. 4, although the edge part of the short side part 210W is connected on the extension line Ex of the edge part of the inner side perforation Ri of the long side part 210L1, both may not be connected on the same linear form.

As described above, when the paper thickness t of the carton 20 is lowered, the ease of cutting the opening perforation 210 is appropriately adjusted by simply adjusting the length of the cut line and the cut portion of the opening perforation 210. It is difficult to set, and it is necessary to set the relationship between the paper thickness t of the carton and the opening perforation 210 as the carton 20 becomes thinner.
Therefore, attention was paid to opening the opening perforation 210 first from the short side portion 210W. That is, it is difficult to open when the length of the tab part c1 of the short side part 210W is long, but it is possible to prevent the carton from being opened carelessly during manufacture or storage (before the user manually opens the carton). On the other hand, when the length of the jumper part c1 is shortened, it is easy to open, but there is a possibility that it will be opened carelessly during manufacture or storage of the carton. For this reason, the ratio between the length of the strip portion c1 of the short side portion 210W and the paper thickness t is defined in the above range.
By setting the perforation of the short side portion 210W in this way, even when the paper thickness t of the carton 20 is reduced to 0.43 mm / sheet or less, the opening perforation is inadvertently produced during the production or storage of the carton. It is possible to prevent the opening perforation and to easily open the perforation perforation cleanly at the time of use.
In addition, when the short side part 210W consists of two or more perforations, the part of 50% or more of the length of the short side part 210W about the perforation with the longest cut line among each single perforation. May be in a range defined by n1, c1, and c1 / t described above. This is because the perforation having the longest cut line is the easiest to open, and the cut is generated first. Here, “50% or more of the length of the short side portion” refers to a portion of 50% or more of the length of the perforation having the longest cut line in each of the short side portions 210W1 and 210W2. That is, n1, c1, c1 / t is within the above range for all of the short sides (100% of the length), and n1, c1, c1 / t is within the above range for the other short side. If it falls off, it does not fall under “50% or more of the length of the short side”.

When the length of the cut line n1 is less than 7 mm, the strength of the perforation of the short side portion 210W becomes too strong, and it becomes difficult to open the perforation 210 for opening at the time of use.
When the length of the cut line n1 exceeds 35 mm, the joint portion c1 is relatively shortened and the strength of the perforation of the short side portion 210W is weakened. As a result, as shown in FIG. 13, when a force is applied to the portion PI inside the perforation at the time of manufacture or storage of the carton, the perforation of the short side portion 210W is cut and the portion falls off downward or upward, and the Open in preparation (before the user opens it by hand during use).
If the length of the collar portion c1 is less than 0.70 mm, the perforation strength becomes too weak, and the part inside the perforation falls downward during manufacture or storage of the carton as described above, and is carelessly opened. Resulting in.
When the length of the corrugated portion c1 exceeds 1.40 mm, the perforation becomes too strong and difficult to open, and as shown in FIG. 14, the surface layer S on the carton surface of the corrugated portion c1 extends to the outside as shown in FIG. Pulled, turned and torn.

If the (length of the claw portion c1) / (paper thickness t) is less than 2.0, the perforation strength becomes too weak, and the portion inside the perforation is downward when the carton is manufactured or stored as described above. It will fall off and will be opened carelessly. If (length of the claw portion c1) / (paper thickness t) exceeds 4.0, the perforation becomes too strong and it is difficult to open the seal.
When the basis weight of the carton is 250 to 370 g / m ² and the paper thickness t is out of the range of 0.28 to 0.43 mm / sheet, (the length of the strip portion c1) / (paper thickness t) is 2. Even if it is less than 0 or exceeds 4.0, the above-described problem of difficulty in opening may not occur. However, in the present invention, the basis weight and paper thickness of the carton 20 are defined in the above range. Thus, since the object is to make the carton difficult to be crushed without causing an increase in cost, the case where the basis weight and the paper thickness of the carton 20 are out of the above range is not targeted.

On the other hand, by setting 50% or more of the lengths of the long side portions 210L1 and 210L2 to double or more perforations, the unevenness of the edges of the perforations after opening becomes smaller and smoother than the single perforations. Therefore, it is less likely that the hand is cut at the edge of the perforation after opening. Further, by making the long side portions 210L1 and 210L2 have double or more perforations, even if the length of the joint portion c2 of the inner perforation Ri increases, as in the case of the short side portion 210W (FIG. 14). (Refer) It can suppress that the surface layer S of the carton surface of a corrugated part is pulled to the outer side, and is torn.
However, as shown in FIG. 15A, in the case of a double or more perforation, for example, the inner crevice Ri of the inner perforation Ri of the long side portion 210L1 is cut between the cut line n2 adjacent to itself. In addition, there is a case where the outer perforation Ro is cut between the adjacent cut line n3, and there are three cutting paths as shown by arrows.
On the other hand, as shown in FIG. 15 (b), in the case of a single perforation, for example, the joint part c1 of the short side part 210W is cut only between the cut line n1 adjacent to itself and cut as indicated by an arrow. There is only one route. For this reason, compared with the double or more perforations, it is possible to prevent the inside portion of the perforation from dropping downward and unintentionally opening when the carton is manufactured or stored. Therefore, it is preferable that 50% or more of the length of the short side portion 210W is composed of a single perforation.
As will be described later, it is preferable that (the length of the cut line n1 of the short side portion)> (the length of the cut line n2 of the inner perforation Ri of the long side portion). Since the strength of the eye is relatively higher than the strength of the perforation of the short side portion, even if the long side portion is longer than the short side portion, the long side portion is difficult to fall off as shown in FIG. There is no problem even if a double perforation is adopted.

The length of the cut line n1 is preferably 10 to 30 mm, and more preferably 15 to 27 mm. It is preferable that the length of the bush part c1 is 0.80 to 1.30 mm, and more preferably 0.90 to 1.20 mm.
It is preferable that it is (length of the cover part c1) / (paper thickness t) = 2.6-3.7, and it is more preferable that it is 2.8-3.5.
The number of the cut lines n1 is preferably 1 to 10, more preferably 2 to 8, and further preferably 3 to 6. When the number of the cut lines n1 is less than one, it is difficult to open the perforation 210 for opening at the time of use. When the number of the cut lines n1 exceeds 10, the number of the cut lines n1 becomes too large and the carton is manufactured as described above. In some cases, the inner part of the perforation may drop downward or upward during storage and be opened carelessly.

  In the example of FIG. 4, a pressing portion R <b> 3 composed of a substantially circular perforation is formed on the top surface portion 201 inside the short side portion 210 </ b> W. By placing the finger on the pressing portion R3 and pushing it into the inside of the carton 20, the single perforation of the short side portion 210W can be opened and the short side portion 210W can be easily opened.

It is preferable that (the length of the cut line n1 of the short side portion)> (the length of the cut line n2 of the inner perforation Ri of the long side portion). If it does in this way, even if it makes 50% or more of the length of a long side part a double or more perforation as mentioned above, it can suppress that the perforation of a long side part falls and carelessly opens. Moreover, it becomes easy to open the short side part 210W which opens the perforation 210 for opening first.
It is preferable that (the number of cut lines n1 in the short side portion) <(number of cut lines n2 in the inner perforation Ri in the long side portion). In this case, the length of the cut line per one short side portion becomes relatively long, and even if 50% or more of the length of the long side portion is a double perforation, the length of the long side portion It is possible to prevent the perforation from dropping and inadvertent opening. Moreover, it becomes easy to open the short side part 210W which opens the perforation 210 for opening first.

When the opening perforation 210 is opened from the short side portion 210W, the inner perforation Ri closest to the perforation of the short side portion 210W is opened with force, so the inner perforation Ri is set as follows. It is preferable to specify.
Note that “closest to the perforation of the short side portion 210W” means that when the cut line n1 of the perforation of the short side portion 210W exists at the boundary Re as shown in FIG. The perforation of the long side portion closest to the position of n1 (in the example of FIG. 4, the length of the cut line at both ends of the inner perforation Ri is longer than the length of the other cut line n2, The inner perforation Ri and the short side portion 210W are connected at the boundary Re without a break). On the other hand, when the perforated cut line n1 of the short side portion 210W does not exist at the boundary Re (that is, the jump line portion is interposed at the boundary Re), the position of the end of the cut line n1 closest to the boundary Re is The perforation of the nearest long side.
And the length of the inner part perforation Ri of the crevice part c2 is 0.50-1.20 mm, and (the length of the inner part c2) / (paper thickness t) = 1.5-3.5. It is preferable because it is easy to open.
When the length of the corrugated portion c2 is less than 0.50 mm, the perforation strength is weakened, and as described above, the portion inside the perforation falls downward during manufacture or storage of the carton, and is opened carelessly. Sometimes. If the length of the corrugated part c2 exceeds 1.20 mm, the perforation strength may increase and it may be difficult to open.
If (the length of the cover part c2) / (paper thickness t) is less than 1.5, the perforation strength is weakened, and the inner part of the perforation is lowered when the carton is manufactured or stored as described above. It may fall off and be opened carelessly. If (the length of the bush portion c2) / (paper thickness t) exceeds 3.5, the perforation strength may increase and it may be difficult to open.
It is preferable that the length of the bush part c2 is 0.60 to 1.10 mm, and most preferably 0.60 to 1.00 mm.
It is more preferable that (the length of the bush portion c2) / (paper thickness t) = 1.7 to 3.2, and most preferable is 2.0 to 2.8.

Similarly, the length of the cut line n2 of the inner perforation Ri is 0.70 to 1.40 mm, and (the length of the cut line n2) / (the length of the joint c2 of the inner perforation Ri) = If it is 0.90 to 2.00, it will be easy to open, which is preferable.
If the length of the cut line n2 is less than 0.70 mm, the perforation strength may increase and it may be difficult to open. When the length of the cut line n2 exceeds 1.40 mm, the strength of the perforation is weakened, and the part inside the perforation falls down during the manufacture and storage of the carton as described above, and is opened carelessly. Sometimes.
If (the length of the cut line n2) / (the length of the protruding portion c2) is less than 0.90, the perforation strength may increase and it may be difficult to open. If (the length of the cut line n2) / (the length of the collar portion c2) exceeds 2.00, the strength of the perforation is weakened, and the portion inside the perforation when the carton is manufactured or stored as described above May drop down and open carelessly.
The length of the cut line n2 is more preferably 0.70 to 1.30 mm, and most preferably 0.80 to 1.20 mm.
(Length of the cut line n2) / (Length of the jump part c2) = 0.90 to 1.60 is more preferable, and 1.1 to 1.5 is most preferable.

When a force is applied to the inner perforation Ri to open it, the perforation located on the outside adjacent to the inner perforation Ri (outer perforation Ro) is also opened, and the cut surface of the inner perforation Ri and the outer perforation Ro The edge of becomes uneven. Therefore, when the outer perforation Ro is defined as follows, the unevenness of the edge of the perforation after opening becomes small and smooth, and the hand is less likely to be cut by the perforation after opening.
For this reason, in the outer perforation Ro, the length of the jumper portion n3 is 0.80 to 1.60 mm, and (the length of the jumper portion c3) / (paper thickness t) = 1.7 to 4.6 is preferable because the unevenness of the edge of the perforation after opening becomes small.
Further, the length of the cut line n3 is 0.35 to 1.00 mm, and (the length of the cut line n3) / (the length of the strip part c3) = 0.30 to 0.80. preferable. Moreover, it is preferable that the length of the cut line n3 is shorter than the length of the protrusion part c3. In addition, it is preferable that the outer perforation Ro is formed as a cut line having the same length as the jumper c2 while being separated from the jumper c2 on the outer side of the jumper c2 of the inner perforation Ri.

If the length of the seal part n3 is less than 0.80 mm, the perforation may drop off, and if it exceeds 1.60 mm, the perforation may be strong and difficult to open.
If the (length of the claw portion c3) / (paper thickness t) is less than 1.7, the perforation may be weakly dropped, and if it exceeds 4.6, the perforation may be strong and difficult to open.

If the length of the cut line n3 is less than 0.35 mm, the perforation is strong and difficult to open, and if it exceeds 1.00 mm, the perforation is weakly dropped and the perforations on the perforation after opening become large. There is a risk of injury to the hand.
If the length of the cut line n3 is equal to or longer than the length of the seal part c3, the perforation may fall off. In particular, when (length of the cut line n3) / (length of the protruding part c3) is 0.30 to 0.80, the perforation is easily opened without dropping.

The length of the cut line n3 is more preferably 0.40 to 0.90 mm, and most preferably 0.50 to 0.80 mm. The length of the corrugated part c3 is more preferably 0.80 to 1.50 mm, and most preferably 1.00 to 1.40 mm.
(Length of cut line n3) / (length of jump part c3) = 0.30 to 0.70 is more preferable, and 0.40 to 0.60 is most preferable.
It is more preferable that (the length of the bush part c3) / (paper thickness t) = 2.2 to 4.3, and most preferable is 3.0 to 4.0.

Next, the configuration of the disassembling perforation 220 will be described with reference to FIG. The disassembling perforation 220 is not an essential component of the present invention. However, if the disassembling perforation 220 is provided, the carton 20 can be easily disassembled and separated. The disassembling perforation 220 is composed of a single perforation, two straight portions Rb formed in parallel to the width direction W of the carton 20 from the both ends of the upper surface side outer flap 206 (206B) toward the center, and each straight line. An arcuate portion Ra that is disposed in the center portion of the carton 20 and intersects the width direction W of the carton 20 between the portions Rb. The arc-shaped portion Ra has an upwardly convex semicircular shape toward the top surface portion 201, and the arc-shaped portion Ra is pushed into the carton 20 by applying a finger to the upper surface side outer flap 206 (206B) and the lower surface side outer flap 207 ( 207B) is separated for easy disassembly.
Note that “crossing the width direction W of the carton 20” means excluding the perforated part (straight line portion Rb) parallel to the width direction W of the carton 20. The disassembling perforation 220 is provided slightly above the lower end edge 206e of the upper surface side outer flap 206.

The arc-shaped portion Ra has a length of the cut line n4 of 3 to 20 mm, a length of the flute portion c4 of 0.8 to 2.5 mm, and 2 to 10 cut lines n4 are arranged apart from each other, The length of c4) / (paper thickness t) is preferably 2.8 to 6.0.
By setting the arc-shaped portion Ra in this way, even if the paper thickness t of the carton 20 is reduced to 0.43 mm / sheet or less, the sheet is not easily broken by the perforation for dismantling when the carton is manufactured, and when the carton is dismantled It becomes easy to cut off by the arc-shaped portion Ra of the perforation line, and the ease of cutting the perforation line for disassembly can be set appropriately.

If the length of the cut line n4 is less than 3 mm, the strength of the perforation may be increased and it may be difficult to open the disassembling perforation 220. When the length of the cut line n4 exceeds 20 mm, the perforation becomes weak, and the part inside the perforation may drop downward during manufacture or storage of the carton as described above, and may be opened carelessly. is there.
If the length of the corrugated part c4 is less than 0.8 mm, the perforation becomes weak, and the part inside the perforation falls down during the manufacture and storage of the carton as described above, and opens unintentionally. There is a case. When the length of the corrugated part c4 exceeds 2.5 mm, the strength of the perforation may be increased and it may be difficult to open the disassembling perforation 220.
When the number of the cut lines n4 is less than 2, the arc-shaped portion Ra may be small, and it may be difficult to open the disassembling perforation 220. When the number of the cut lines n4 exceeds 10, the arc-shaped portion Ra becomes too large, and the part inside the perforation may drop downward during manufacture or storage of the carton as described above, and may be opened carelessly. is there.
When (length of the cushion part c4) / (paper thickness t) is less than 2.8, the perforation becomes weak, and the part inside the perforation falls off during manufacture and storage of the carton as described above. , You may open it carelessly. If (the length of the bush part c4) / (paper thickness t) exceeds 6.0, the strength of the perforations may be increased, making it difficult to open the disassembling perforations 220.

The length of the cut line n4 is more preferably 3 to 10 mm, and most preferably 4 to 8 mm. The length of the corrugated part c4 is more preferably 1.00 to 2.00 mm, and most preferably 1.20 to 1.60 mm.
It is more preferable that 2 to 8 cutting lines n4 are arranged apart from each other, and it is most preferable that 4 to 7 separation lines are arranged apart.
(Length of the bush part c4) / (paper thickness t) is more preferably 3.3 to 5.4, and most preferably 3.8 to 5.0.

By the way, generally, when the basis weight or paper thickness of a carton is 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. 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 inner carton 20 is easily crushed is increased. Is required. And, for example, as shown in FIG. 6, the carton 20 is composed of multiple layers 20U to 20Z, and the proportion of the hard layers 20X, 20Y, and 20Z containing 40 to 100% by mass of the coniferous pulp is 15 to 75% by mass. It has been found that the strength of the carton can be increased without increasing the cost even if the basis weight or paper thickness of the carton is low.
If the carton contains a hard layer, the strength of the carton will increase and the perforation will be difficult to cut, or the carton will become brittle and the perforation may be easily cut. When the invention is applied, the ease of opening the perforation for opening can be set more appropriately.
Here, instead of increasing the strength of all the layers constituting the carton 20, if a hard layer having a high strength and a hard layer is laminated on a part of the layer of the carton 20, even if the basis weight or the paper thickness of the carton is low, The crushing of the carton can be reduced.
In addition, the hard layers 20X, 20Y, and 20Z preferably contain 40 to 80% by mass, more preferably 40 to 60% by mass of the conifer-derived pulp. Of the layers constituting the carton 20, the layers 20U, 20V, and 20W other than the hard layers 20X, 20Y, and 20Z contain less than 40% by mass of softwood-derived pulp, and are stronger than the hard layers 20X, 20Y, and 20Z. Low.
Further, the hard layers 20X, 20Y, and 20Z can be made from a raw material mainly composed of corrugated cardboard waste paper, for example, and the total amount of coniferous pulp is adjusted by adjusting the blending amount of the corrugated cardboard waste paper. Thereby, the cost of virgin pulp can be suppressed. The other layers 20U, 20V, and 20W can be made from, for example, raw materials mainly composed of magazine waste paper.
In addition, although there is no restriction | limiting in the position of the hard layer in the layer of the carton 20, It is preferable to provide layers other than a hard layer on the surface. By providing a layer other than the hard layer on the surface, the surface property of the carton is improved, and the tactile sensation and the print quality are improved.

In addition, “the pulp derived from conifers” 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 discriminate softwood pulp by dyeing according to this test method, the fiber form of softwood pulp (fiber length of about 2.0 to 4.5 mm, fiber width of about 20 to 70 μm) is hardwood pulp. This is different from the fiber form (fiber length of about 0.8 to 1.8 mm, fiber width of about 10 to 50 μm).
Further, if the proportion of the hard layer in the carton is less than 15% by mass, the carton strength may be lowered when the basis weight of the carton or the paper thickness is lowered. If the proportion of the hard layer in the carton exceeds 75% by mass, it may be difficult to insert ruled lines during the production of the carton, resulting in poor formability, and it may be difficult to fold the carton during disposal. The proportion of the hard layer in the carton is more preferably 25 to 70% by mass, still more preferably 30 to 65% by mass, and most preferably 40 to 60% by mass.
In addition, since each layer separates when the carton is immersed in water or hot water, the pulp is derived from the conifers contained in each layer by separating the separated layers and collecting the fibers and measuring the amount of long fibers by microscopic observation Can be determined. Thus, after each layer which comprises a carton is discriminate | determined, the ratio for which a hard layer accounts is calculated as (total mass of all the hard layers) / (mass of carton) x100 (%).

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

The ring crush value is measured by collecting a strip-shaped test piece having a width of 12.7 mm and a length of 152.4 mm from a sheet of the carton 20 according to JIS-P8126 (2005). 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 (short direction of the test piece) is measured.
The ring crush value RL in the long side direction of the carton 20 is 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). Refers to cases.
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). 3 includes two ruled lines RC). However, since the ruled line is the same as the direction in which the test piece S1 is compressed, the measurement can be performed if the number of ruled lines RC included in the test piece S1 is two or less.

Further, (RL / t) represents a ring crush value RL per sheet thickness t, and indicates that the higher the (RL / t) is, the higher the strength is. When (RL / t) is less than 1.7, RL becomes low and the carton is easily crushed. On the other hand, when (RL / t) exceeds 2.5, the strength is increased, but the carton becomes too hard and the ruled line is difficult to enter, and the carton moldability may be inferior. In addition, as described above, when the hard layer contains corrugated cardboard waste paper, if (RL / t) exceeds 2.5, the percentage of corrugated cardboard waste paper in the carton becomes too large and the carton becomes brittle. When forming into a box shape, ruled line cracks may occur.
(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 corrugated cardboard waste paper, the content of the corrugated cardboard waste paper in the pulp raw material in the carton 20 is preferably 20 to 80 mass%, more preferably 25 to 75 mass%, and more preferably 30 to 70 mass%. % Is more preferable, and 35 to 65% by mass is most preferable.
When the content ratio of the waste paper derived from corrugated cardboard is less than 20% by mass, the strength is hardly increased and the carton may be easily crushed. On the other hand, when the content ratio of the used paper derived from corrugated cardboard exceeds 80% by mass, the carton becomes brittle and ruled line cracks may occur when it is formed into a box shape.
When used corrugated paper, aluminum contained in the used corrugated paper (derived from aluminum vapor-deposited paper pack, foil stamped paper, etc.) may be a foreign substance and contained in the carton. Since it becomes a claim when the foreign matter derived from aluminum is contained in the carton, the rejection rate of the screen or the like in the used paper pulp process is appropriately adjusted so that the size of the foreign matter derived from aluminum contained in the carton is 3.0 mm ² or less. Is preferred.

When the bending stiffness SL in the long side direction of the carton 20 is 3.7 to 7.5 mN · m, the strength is maintained even with a low basis weight, and the collapse of the carton can be further suppressed. If the bending stiffness SL of the carton is less than 3.7 mN · m, the carton tends to be crushed, and if it exceeds 7.5 mN · m, the strength becomes higher 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 in accordance with the method described in ISO-2493, using L & W Bending Tester (manufactured by Lorentzen & Wettre), one end of a test piece with a width of 38 mm and a length of 100 mm on a chuck of a sample stand. Then, the one surface outside the one end side of the test piece is brought into contact with the protruding engagement portion of the detection portion on the sample stage. At this time, the other end of the test piece is in an unconstrained free state. In this state, the bending length (the distance between the chuck of the sample table and the engaging portion, that is, the span of the test piece (between the beams)) is 10 mm, and the bending angle (the rotation angle of the chuck holding one end of the test piece, this rotation). In this case, the test piece was pressed against the engaging portion, and the bending resistance (load) was measured at 15 degrees. 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 the 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. When the bending stiffness ST is less than 7.5 mN · m, for example, when storing a product in which a plurality of packaging packs of the carton 20 are placed with the top surface portion 201 facing upward, the side surface portions 203 and 204 of the carton 20 are bent. There is a case. On the other hand, if the bending stiffness ST exceeds 14.5 mN · m, the strength may become higher than necessary and the cost may increase.

The compressive strength in the long side direction of the carton 20 is preferably 130 to 220 N / box. If the compressive strength is less than 130 N / box, the strength of the carton 20 may be reduced 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 compression strength is performed as follows. First, the carton 20 is placed in a compression tester (for example, product name: AUTOCOM, manufactured by TS E) so that the long side of the carton 20 is vertical (axial direction), and a compression plate having an area of 177 cm 2 (a circle having a diameter of 15 cm). Is placed on the carton 20. At this time, the surfaces of the outer flaps 206 and 207 of the carton 20 are completely placed inside the compression plate. Then, the compression plate is compressed by applying a uniaxial load under the condition of a pressing speed of 10 mm / min, and the first inflection that first appears upward in the axial displacement and load graph shown in FIG. The point (the lower part when the long side of the carton 20 was placed vertically (axial direction) was often crushed or buckled) was defined as the compressive strength (N). The measurement averaged the value performed 5 times on the constant temperature and humidity conditions of 23 degreeC and 50% RH.
The reason why the compressive strength in the long side direction of the carton 20 is specified is that when a plurality of cartons 20 with the long sides of the carton 20 being vertically stored are stored in the cardboard 10 and stored, a plurality of carton containing cardboard boxes 100 are stacked. This is because the load is applied in the long side direction of the carton 20 and 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.
If 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 the paper product such as tissue paper contained in the carton 20 may be reduced. It may be necessary to reduce the number of sets, which may reduce the feeling of use. If 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 decreases, and the carton 20 may be easily crushed. is there. The long side Lc of the carton 20 is preferably 220 to 240 mm, and more preferably 220 to 230 mm. Further, the width Wc of the carton 20 is preferably 110 to 125 mm, and more preferably 110 to 120 mm. The height Hc of the carton 20 is preferably 42 to 55 mm, and more preferably 42 to 48 mm.

  It goes without saying that the present invention is not limited to the above-described embodiment, but extends to various modifications and equivalents included in the spirit and scope of the present invention. For example, the type and material of the carton and the paper product accommodated in the carton and the lamination mode of the paper product are not limited. The configurations of the opening perforation and the disassembling perforation are not limited to the above.

FIG. 10 is a partial top view showing the configuration of another embodiment of the opening perforation 310. The opening perforation 310 has a substantially elliptical shape that is long in the longitudinal direction L of the carton 20, and each of the long side portions 310L1 and 310L2 is a curve. Further, the short side portion 310W (only one is shown in FIG. 10) extends along the width direction W of the carton 20, and toward the both ends Re of the inner perforation Ri of the long side portion 310L1 (310L2), toward the outside. It is curved and connected to a curve. Since the opening perforation 310 is symmetrical in the center portion Ce in the longitudinal direction L of the carton 20, only the opening perforation 310 on the right side of the center portion Ce is shown in FIG. The illustration of the eye 310 is omitted. However, the pressing portion R31 is formed only on the right side of the central portion Ce.
In addition, a pressing portion R31 made of a perforation is formed inside both the long side portions 310L1 and 310L2. The pressing portion R31 has a substantially circular central portion and linear portions extending in the width direction W of the carton 20 from the central portion toward the inner perforations Ri of the long side portions 310L1 and 310L2, and each end portion of the linear portion. Is connected to the inner perforation Ri. By placing the finger on the pressing portion R31 and pushing it into the carton 20, the short side portion 310W can be easily opened.
When the perforation of the pressing portion R31 is cut and the perforation of the short side portion 310W is left without being cut, the region F (hatching region in FIG. 10) between the pressing portion R31 and the short side portion 310W is a carton. Even after the takeout port is formed, it remains as a flap on the carton 20 side and covers the periphery of the takeout port. Accordingly, in this case, the perforation of the short side portion 310W on the right side of the center portion Ce constituting the flap of the region F is excluded from the definition of the present invention, and the perforation of the short side portion 310W on the left side of the center portion Ce (not shown) is excluded. Will be prescribed. Of course, when the region F is separated, the definition of the present invention is applied to the perforation of the short side portion 310W on the right side of the center portion Ce.

FIG. 11 is a partial top view showing the configuration of still another embodiment of the opening perforation 410. The opening perforation 410 has a long side portion 210L1 (210L2) having the same shape as the opening perforation 210, and a short side portion 410W. Since the opening perforation 410 is symmetrical in the center portion Ce in the longitudinal direction L of the carton 20, only the opening perforation 410 on the right side of the center portion Ce is shown in FIG. The illustration of the eye 410 is omitted. However, the pressing portion R3 is formed only on the right side of the central portion Ce.
The short side portion 410W constitutes a double perforation composed of an inner perforation Rs and an outer perforation Rp, and the above-described n1, c1, and c1 / t are defined for the perforation Rs having the longest cut line. To do. The perforation Rp is formed as a cut line having the same length as that of the joint portion c1 while being separated from the joint portion c1 on the outer side of the joint portion c1 of the perforation Rs.

FIG. 12 is a partial top view showing the configuration of another embodiment of the disassembling perforation 320. The disassembling perforation 320 is composed of a single perforation, and is formed of two straight portions Rd that are formed in parallel to the width direction W of the carton 20 and slightly from both ends of the lower surface side outer flap 207 (207B) toward the center. And an arcuate portion Ra2 that is disposed at the center of the lower surface side outer flap 207 (207B) and intersects the width direction W of the carton 20 between the straight portions Rd. The arc-shaped portion Ra2 has a semicircular shape that protrudes downward toward the bottom surface portion 202, and presses the arc-shaped portion Ra2 into the carton 20 by applying a finger to the upper surface side outer flap 206 (206B) and the lower surface side outer flap 207 ( 207B) is separated for easy disassembly.
The disassembling perforation 320 is provided slightly below the upper edge 207e of the lower surface side outer flap 207, and only the arc-shaped portion Ra2 is exposed, and each straight portion Rd is covered by the upper surface side outer flap 206 (206B). Yes. When the arc-shaped portion Ra2 is pushed in, the arc-shaped portion Ra2 and each linear portion Rd are cut to separate the upper surface side outer flap 206 (206B) and the lower surface side outer flap 207 (207B).

A tissue paper carton (tissue paper box) 20 containing 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 to 4.
In the carton, the total number of layers was six, of which the hard layer was three. Since the basis weight of each layer was the same, the ratio of the hard layer was 50% by mass. Moreover, in each hard layer, the ratio of the pulp derived from conifers was 50 mass%. Further, as the pulp raw material of each layer, the pulp other than the hard layer was a pulp mainly made of magazine waste paper, and the hard layer was a waste paper pulp derived from corrugated cardboard.
A multilayer carton was obtained by paper making using a known multilayer paper machine having a large number of head boxes. If necessary, a known paper strength agent was applied between the layers.
The basis weight of the carton, the paper thickness t, the compressive strength, and the bending stiffness in the long side direction were measured as described above. The size of each perforation was measured using a ruler or a microscope.

Various characteristics at the time of manufacturing a carton by bending a ruled line from the sheet shown in FIG. 3 were evaluated as follows.
Ease of opening each perforation: Ease of opening perforations when using a carton was evaluated.
Presence of inadvertent opening due to omission of each perforation: Before packing the manufactured carton into cardboard, the perforation is cut as shown in FIG. It was visually evaluated whether or not it was dropped.
Breaking of carton surface outside perforation: When the carton is used, when the perforation of the short side is opened, whether the surface layer of the carton surface of the claw portion c1 is turned to the outside as shown in FIG. Visually evaluated.
Unevenness at the edge of the perforation at the long side: When the length of the cut line n3 of the outer perforation Ro exceeds 1.00 mm, the unevenness at the edge of the perforation was considered to be large and inferior in smoothness.
In each evaluation, the normal level of crushing, which is not a problem in practice, was set to “3”, “4” was slightly superior, and “5” was excellent. Similarly, “2” indicates an inferior value to “3”, and “1” indicates an inferior value. If evaluation is 3-5, there is no problem.

  Further, a pack product in which five cartons 20 are stacked in the height direction and packed with a film is stored in a predetermined cardboard box 10 in a plurality of stages with the long sides of the carton 20 vertically, and ten carton-containing cardboard boxes are stacked. The carton containing cardboard box at the bottom was opened and visually checked for the presence of crushing of the carton. In the evaluation, the normal level of crushing, which has no practical problem, was set to “3”, the slightly superior level was “4”, and the excellent level was set to “5”. Similarly, “2” indicates an inferior value to “3”, and “1” indicates an inferior value. If evaluation is 3-5, there is no problem.

Furthermore, the bendability of the carton at the time of disposal was evaluated as follows. First, the empty carton 20 that uses up tissue paper is formed into a quadrangular prism shape with the outer flaps 206 and 207 opened, and is further crushed along a ruled line as shown in FIG. And the side portion 203. Next, this carton was folded back by hand at the central portion C in the long side direction, and the ease of folding was evaluated.
In the evaluation, “3” was set to be equivalent to the conventional product, and the evaluation was made on the basis of 5 grades in the same manner as described above.

  The obtained results are shown in Tables 1 to 4.

  As is clear from Table 1 to Table 4, in each example in which the basis weight of the carton, the paper thickness, and the setting of the perforation for opening are within a predetermined range, even if the basis weight of the carton and the paper thickness are low, The opening perforation does not open carelessly during manufacture or storage of the carton, and it is easy to open during use, making the opening perforation easier to break, and the carton breaks starting from the opening perforation I was able to prevent. Further, in each of the examples, the carton strength was improved without significantly increasing the basis weight or the paper thickness of the carton, thereby preventing the carton from being crushed.

  On the other hand, in the case of Comparative Example 1 where the basis weight of the carton and the paper thickness were less than the specified range, the strength of the carton was lowered and the carton was crushed.

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

  In the case of Comparative Example 3 in which the length of the cut line n1 at the short side of the opening perforation is less than 7 mm, the opening perforation is difficult to open. In the case of Comparative Example 3, the length of the arc-shaped cut line n4 was less than 3 mm, and it was difficult to open the disassembling perforation.

  In the case of Comparative Example 4 in which the length of the cut line n1 of the short side portion of the opening perforation exceeded 35 mm, the opening perforation dropped and was opened carelessly. In the case of Comparative Example 4, the length of the arc-shaped cut line n4 exceeded 20 mm, and the disassembling perforation was also dropped and opened unintentionally.

  In the case of Comparative Example 5 in which the length of the short side part of the opening perforation c1 is as short as less than 0.70 mm and the length / paper thickness t of the joint part c1 is less than 2.0, for opening The perforation dropped and was opened carelessly. In the case of Comparative Example 5, since the length of the arcuate part c4 is less than 0.80 mm and the length / paper thickness t of the part c4 is less than 2.8, the disassembling perforation is also used. I dropped it and opened it carelessly.

  In the case of Comparative Example 6 in which the length of the short part c1 of the opening perforation exceeds 1.4 mm and the length / paper thickness t of the part c1 exceeds 4.0, the perforation for opening Became difficult to open, and the carton surface outside the perforation was torn. In the case of Comparative Example 6, since the length of the arcuate part of the corrugated part c4 exceeds 2.0 mm and the length of the corrugated part c4 / paper thickness t exceeds 6.0, the disassembling perforation is also opened. It became difficult to do.

  In the case of Comparative Example 7 in which the number of cut lines n1 on the short side of the opening perforation is less than one, the opening perforation is difficult to open. In the case of Comparative Example 7, the length of the cut line n2 of the inner side perforation Ri of the long side is as short as less than 0.70 mm, and the length of the cut line n2 / the length of the strip part c2 is 0.9. Therefore, the opening perforation is difficult to open even on the long side. Further, the number of cut lines n4 in the arc-shaped portion is less than 2, and it is difficult to open the disassembling perforation.

  In the case of Comparative Example 8 in which the number of cut lines n1 on the short side portion of the opening perforation exceeded 10, the opening perforation dropped and was opened carelessly. In the case of Comparative Example 8, the length of the cut line n2 of the inner perforation Ri of the long side portion exceeds 1.40 mm, and (the length of the cut line n2 / the length of the contact portion c2) is 2. Since it exceeded 0, the long side portion of the opening perforation was also dropped and opened carelessly. Moreover, in the case of the comparative example 8, the cut line n4 of the arc-shaped part exceeded ten pieces, the perforation for dismantling also fell off and opened carelessly.

  In the case of Comparative Example 9 in which the length of the cut line n1 at the short side portion of the opening perforation is less than 7 mm, the opening perforation is difficult to open. In the case of the comparative example 9, the length of the inner side perforation Ri of the long side portion c2 is less than 0.50 mm and (the length of the cut line n2 / the length of the hook portion c2) is 2.0. And (the length of the strip portion c2 / paper thickness t) was less than 1.5, and the long side portion of the opening perforation was also dropped and opened unintentionally.

  In the case of Comparative Example 10 in which the length of the cut line n1 at the short side portion of the opening perforation is less than 7 mm, the opening perforation is difficult to open. In the case of Comparative Example 10, the length of the inner crevice Ri of the long side portion c2 exceeds 1.20 mm, and (the length of the cut line n2 / the length of the hook portion c2) is 0.9. Since the length of the corrugated part c2 / paper thickness t) exceeded 3.5, the opening perforation became more difficult to open at the long side part.

  In the case of Comparative Example 11 in which the length of the cut line n1 at the short side portion of the opening perforation is less than 7 mm, the opening perforation is difficult to open. In the case of Comparative Example 11, the length of the outer perforation Ro of the long side portion c3 is less than 0.80 mm, and (the length of the cut line n3 / the length of the hook portion c3) is 0.8. And the length (paper thickness t) of the corrugated portion c3 was less than 1.7, so that the long side portion of the opening perforation dropped and was opened carelessly.

  In the case of Comparative Example 12 in which the length of the cut line at the short side portion of the opening perforation is less than 7 mm, the opening perforation becomes difficult to open. In the case of the comparative example 12, the length of the outer side perforation Ro of the long side portion c3 exceeds 1.60 mm, and (the length of the cut line n3 / the length of the hook portion c3) is 0.3. Since the (length of the cushion part c3 / paper thickness t) exceeded 4.6, it was difficult to open the long side part of the opening perforation.

  In the case of Comparative Example 13 in which the length of the cut line n1 of the short side portion of the opening perforation is less than 7 mm, the opening perforation becomes difficult to open. In the case of Comparative Example 13, the length of the cut line n3 of the long side outer perforation Ro is as short as less than 0.35 mm, and (the length of the cut line n3 / the length of the strip portion c3) is Since it is less than 0.30, it is difficult to open the long side portion of the opening perforation.

  In the case of Comparative Example 14 in which the length of the cut line at the short side of the opening perforation is less than 7 mm, the opening perforation is difficult to open. In the case of Comparative Example 14, the length of the cut line n3 of the outer side perforation Ro in the long side portion exceeds 1.00 mm, and (the length of the cut line n3 / the length of the strip portion c3) is 0. Since it exceeded .80, the long side part of the opening perforation dropped off and was inadvertently opened, and the unevenness of the edge of the perforation of the long side part after opening became large, resulting in the risk of injury to the hand.

  In addition, as for the commercial items 1 and 2, the basis weight of the carton and the paper thickness exceeded the predetermined range, and the cost was increased.

20 Carton 20X, 20Y, 20Z Hard layer 25 Paper product 201 Top surface (top surface)
210-410 Perforation for opening 210L1, 210L2, 310L1, 310L2 Long side portion 210W-410W Short side portion 220, 320 Perforation for disassembly L Long side direction of carton W Width direction of carton Re Both ends of long side portion Ri Inner sewing machine Eye Ro Outer perforation Ra, Ra2 Arc-shaped part n1-n4 Cut line c1-c4 Corrugated part

Claims (15)

In a paper cuboid carton containing a laminate 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,
On the top surface of the carton, an opening perforation for forming a takeout opening for taking out the laminate is formed, and an opening perforation that is completely separated from the carton is formed,
The opening perforations are two long side portions along the longitudinal direction of the carton, and short side portions along the width direction of the carton, and are connected to both ends of the two long side portions, respectively. A short side of the book,
50% or more of the length of the long side part is composed of double or more perforations,
Regarding the perforation having the longest cut line among the short sides, the length of the cut line n1 is 7 to 35 mm and the adjacent cut line n1 is 50% or more of the length of the short side. The length of the jumper portion c1 between 0.70 and 1.40 mm,
And (cartridge length c1 length (mm)) / (paper thickness t (mm)) = 2.0 to 4.0 carton containing paper products. Among the two or more perforations of the long side portion, when the perforation closest to the perforation of the short side portion is the inner perforation Ri,
The length (mm) of the cut line n1 of the short side part> (the length (mm) of the cut line n2 of the inner perforation Ri of the long side part). Carton with paper products. Among the two or more perforations of the long side portion, when the perforation closest to the perforation of the short side portion is the inner perforation Ri,
The carton containing paper products according to claim 1 or 2, wherein (the number of the cut lines n1 in the short side portion) <(the number of the cut lines n2 in the inner perforation Ri in the long side portion). The carton containing a paper product according to any one of claims 1 to 3, wherein 50% or more of the length of the short side portion is a single perforation. The carton containing a paper product according to any one of claims 1 to 4, wherein the number of the cut lines n1 is 1 to 10 in the short side portion. Among the two or more perforations of the long side portion, when the perforation closest to the perforation of the short side portion is the inner perforation Ri,
The length of the inner part c2 of the inner perforation Ri is 0.50 to 1.20 mm, and (the length of the upper part c2 (mm)) / (the paper thickness t (mm)) = 1. The carton containing a paper product according to any one of claims 1 to 5, which is 5 to 3.5. Among the two or more perforations of the long side portion, when the perforation closest to the perforation of the short side portion is the inner perforation Ri,
The length of the cut line n2 of the inner perforation Ri is 0.70 to 1.40 mm, and (the length of the cut line n2 (mm)) / (the length of the joint c2 of the inner perforation Ri The thickness (mm)) = 0.90 to 2.00. The carton containing paper product according to any one of claims 1 to 6. Among the two or more perforations on the long side, the perforation closest to the perforation on the short side is the inner perforation Ri, and the perforation is located on the outer side adjacent to the inner perforation Ri. Is the outer perforation Ro,
In the outer perforation Ro, the length of the protruding portion c3 between adjacent cut lines n3 is 0.80 to 1.60 mm, and (the length of the protruding portion c3 (mm)) / (the above Paper thickness t (mm)) = 1.7-4.6. The carton containing the paper product according to any one of claims 1 to 7. Among the two or more perforations on the long side, the perforation closest to the perforation on the short side is the inner perforation Ri, and the perforation is located on the outer side adjacent to the inner perforation Ri. Is the outer perforation Ro,
In the outer perforation Ro, the length of the cut line n3 is 0.35 to 1.00 mm, and (the length of the cut line n3 (mm)) / (between the adjacent cut lines n3. The carton containing a paper product according to any one of claims 1 to 8, wherein the length (mm) of the brim part c3 is 0.30 to 0.80. A side perforation for disassembling the carton is formed on a side surface of the carton along the width direction, and the disassembling perforation crosses the width direction to apply a finger. Having an arcuate portion of
The arcuate part has a length of the cut line n4 of 3 to 20 mm, a length of the hook part c4 between the adjacent cut lines n4 of 0.8 to 2.5 mm, and the cut line n4 of 2 to 2. 10 separated,
And (length of the said part c4 (mm)) / (the said paper thickness t (mm)) = 2.8-6.0 It contains paper products as described in any one of Claims 1-9 carton. 11. The carton containing a paper product according to claim 1, wherein the carton is composed of a plurality of layers, and a ratio of a hard layer containing 40 to 100% by mass of softwood-derived pulp is 15 to 75% by mass. . The carton containing a paper product according to claim 11, wherein the hard layer contains used paper derived from corrugated cardboard. 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. Carton containing paper product according to one item. The carton containing a paper product according to any one of claims 1 to 13, wherein a bending stiffness in the long side direction of the carton is 3.7 to 7.5 mN · m. The carton containing a paper product according to any one of claims 1 to 14, wherein the compressive strength in the long side direction of the carton is 130 to 220 N / box.