JP2009172942A - Corrugating medium and corrugated cardboard sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrugating medium capable of realizing a corrugated cardboard sheet capable of replacing the conventional cardboard of A and B grade, and reduced in weight and excellent in resource saving and reduction of costs as compared with the conventional cardboard of A and B grade, and a corrugated cardboard sheet with the corrugating medium. <P>SOLUTION: A corrugating medium 10 has crest 11 and trough 12 sections formed of an arc, and a straight line section 13 making tangent to both crest 11 and trough 12 sections; wherein a flute height H is 7.9 mm-8.1 mm, the number of flute tips is 22±1 per 30 cm and a tilt angle θ which the straight line 13 makes with a with a straight line connecting flute tips T of the crest 11 is 60°-70°. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a corrugated core in which corrugated core base paper is formed in a corrugated shape, and a corrugated cardboard sheet having the corrugated core.

  Three types of corrugated cardboard are defined by JIS Z1516: A, B, and C. Stage A has a height of 34 ± 2 per 30 cm, and the height of the stage is usually about 4.8 to 5.0 mm. Since it has excellent buffering properties, it is suitable for packaging relatively light and fragile items. Yes. Stage B has 50 ± 2 steps per 30 cm, and the height is about 2.5 to 2.8 mm. It has a high flat compressive strength and is suitable as an outer packaging box for items that cannot be easily crushed, such as canned beverages and canned foods. ing. The C stage has a number of stages and a height between the A stage and the B stage, and is a standard often used in Europe and America, but is rarely used in Japan. In addition, stages other than JIS regulations, such as E stage and F stage, which have a higher number of stages and a lower stage height than B stages, are also used for gift boxes and cosmetic printing boxes.

  In Japan, double-sided corrugated cardboard of A-stage and B-stage is the mainstream among the above-mentioned types, but in addition, double-sided cardboard called “AB-stage”, which has improved buffering and box strength by multilayering. Corrugated cardboard is often used for packing heavy goods or for transportation. The “AB stage” is a structure in which single-sided cardboards of the A stage and the B stage are attached and an outer liner is further arranged. Currently, the AB stage occupies a significant proportion of the total production of corrugated board. Moreover, it is common that the box making trader is also provided with the box making apparatus and equipment for AB steps.

  The above prior art is publicly implemented, and the applicant has not found a document describing this prior art at the time of filing this application.

  However, the AB stage frequently used as described above has the following problems. That is, the corrugated board itself becomes heavy due to the multi-layered structure, and it is difficult to carry, and there is a problem that the corrugated board of the lower layer is easily crushed when stored in a stacked state. Further, in the production of double-sided corrugated cardboard, there is a problem that the consumption and cost of materials increase because a large amount of liner base paper, core base paper, adhesive, etc. are required as compared with the case of double-sided corrugated cardboard. In addition, in order to manufacture a double-sided cardboard, in addition to the double-sided cardboard manufacturing process, a process for further double-sided cardboard is required. There was a problem of needing more.

  Therefore, in view of the above circumstances, the present invention can be used as a corrugated cardboard sheet that can be replaced with the conventional AB stage and can be reduced in weight, resource, and cost compared to the AB stage. An object is to provide a core and a corrugated cardboard sheet having the corrugated core.

  In order to solve the above-mentioned problem, the corrugated core according to the present invention is a corrugated core in which a corrugated core base paper is formed in a corrugated shape, and a peak and a valley formed by an arc, and the peak And a straight portion that is tangent to both the valley portion and the valley portion, the height is 7.9 mm to 8.1 mm, the number of steps is 22 ± 1 per 30 cm in length, and the peak portion The inclination angle of the straight line portion with respect to the straight line connecting the vertices is 60 ° to 70 °.

  In the corrugated cardboard industry, the term “core” may be used to refer to a base paper that has not been formed into a corrugated shape, or may be used to refer to a material that has been formed into a corrugated shape. In this specification and claims, the core before being formed into a waveform is referred to as “core core paper”, and the core after being formed into a waveform is distinguished using the term “corrugated core”. I decided to.

  In the corrugated shape, peaks and valleys can be changed depending on the viewing direction, but for the sake of convenience in the present invention, the side where the liner is first attached in the manufacturing process is referred to as “valley”, and the word “peak” on the other side. We will use it.

  “Height” refers to the length of a perpendicular drawn from one of the straight line connecting the peaks of the peaks and the straight line connecting the bottoms of the valleys toward the other. The term “the number of steps” is according to JIS Z1516.

  The “inclination angle of the straight line portion with respect to a straight line connecting the apexes of the peak portions” is the same as the inclination angle of the straight line portion with respect to the straight line connecting the bottom points of the valley portions, and is an angle referred to as a “flank angle”.

  Conventionally, there has been no corrugated cardboard sheet having the same height as the AB stage and having a strength corresponding to the AB stage. The present inventor makes the corrugated core a special shape having the above-described configuration, and by providing the corrugated core, the height becomes equal to the AB stage in one stage, and the weight per unit area is less than the AB stage. It was found that a corrugated cardboard sheet exhibiting a strength equal to or higher than that of the AB step can be realized.

  Therefore, by using the corrugated core of the present invention, a corrugated cardboard sheet that can be used in place of the AB stage can be provided with a lighter weight than the AB stage. Further, since the usage fee of the base paper and the adhesive is less than that of the AB stage, the cost can be suppressed and the resource saving measures are contributed. Furthermore, since the number of manufacturing steps is smaller than in the case of the AB stage, the time and energy for operating the manufacturing line, and the number of workers for line management can be suppressed.

  In addition, the height of the corrugated core of the present invention is 7.9 mm to 8.1 mm, which is the height obtained by removing the two outer liners from the conventional AB-stage double-sided cardboard sheet, that is, the A-stage corrugated core, The height is equal to the sum of the heights of the liner and the B-stage corrugated core. As a result, the apparatus conventionally used for the AB stage is used as it is as a box making apparatus for processing a ruled line, grooving, cutting, etc. on the corrugated cardboard sheet using the corrugated core of the present invention. It does not impose new capital investment on box makers. Moreover, the corrugated sheet using the corrugated core of the present invention can be used with the conventional AB stage box-making line without the need to adjust the spacing between the creaser for crease and the blade part for grooving / cutting. Can be processed.

  Next, the corrugated cardboard sheet according to the present invention includes “a single-sided corrugated cardboard sheet in which a liner is adhered to one side of the corrugated core”.

  In the production process of a corrugated cardboard sheet, first, a core base paper is formed into a corrugated shape, and a liner is attached to one side thereof to produce a single-sided corrugated cardboard sheet. Therefore, according to the present invention, a single-sided corrugated cardboard, which is a unit for producing corrugated cardboard sheets, can be produced using the excellent corrugated core. In addition, as long as it is a corrugated cardboard sheet provided with a single-sided corrugated cardboard sheet, a double-sided corrugated cardboard sheet with a liner attached to the other side may be used. Further, a multilayered double-sided cardboard sheet or a double-sided cardboard sheet can be used. For example, by adopting a configuration in which an A-level single-sided cardboard is further disposed on a double-sided cardboard sheet, the height is equivalent to a double-sided cardboard sheet having a configuration in which an A-level single-sided cardboard sheet is disposed on a conventional AB level. It can be a double-sided corrugated cardboard sheet that can be substituted for this.

  Further, the corrugated cardboard sheet according to the present invention can be “consisting only of a double-sided corrugated cardboard sheet in which a single liner is adhered to both sides of the single corrugated core”.

  The above configuration is a so-called single-wall cardboard sheet that is used only as a double-sided cardboard. As described above, in the present invention, even if the weight per unit area is less than the AB stage, it exhibits strength equal to or higher than that of the AB stage. It can be widely used for applications.

  As described above, as an effect of the present invention, the corrugated cardboard sheet that can be replaced with the conventional AB stage and can realize a weight reduction, resource saving, and cost reduction as compared with the AB stage is in the waveform. A corrugated cardboard sheet provided with a core and the corrugated core can be provided.

  Hereinafter, the corrugated core, which is the best embodiment of the present invention, and the configuration of a corrugated cardboard sheet having the corrugated core will be described with reference to FIGS. 1 to 3. Here, FIG. 1 is a configuration diagram of a corrugated core according to an embodiment of the present invention, and FIG. 2A is a configuration diagram of a single-sided cardboard sheet having the corrugated core of FIG. b) is a configuration diagram of a double-sided corrugated cardboard sheet having the corrugated core of FIG. 1, and FIG. 3 is an explanatory diagram for explaining the formation of the corrugated core.

  The corrugated core 10 of the present embodiment is a corrugated core in which corrugated core base paper is formed in a corrugated shape, and as shown in FIG. A straight portion 13 that is tangent to both the portion 11 and the valley portion 12, the height H is 7.9 mm to 8.1 mm, and the number of steps is 22 ± 1 per 30 cm in length, The inclination angle θ of the straight line portion 13 with respect to the straight line connecting the vertices T of the peak portion 11 is 60 ° to 70 °. In the following description, the “inclination angle θ of the straight line portion 13 with respect to the straight line connecting the vertices T of the peak portion 11” will be referred to as “flank angle θ”.

  In the corrugated core 10 of the present embodiment, since the number of steps is 22 ± 1 per 30 cm in length, the linear distance between the apexes T of the adjacent peak portions 11 or the bottom point B of the adjacent valley portion 12 is obtained. The step pitch D (see FIG. 1) corresponding to the linear distance between them is 30 / (22 ± 1) cm.

  Moreover, the corrugated cardboard sheet of this embodiment can be configured as a single-sided corrugated cardboard sheet 3 by sticking the liner 2 to one side of the corrugated core 10 as shown in FIG. Or as shown in FIG.2 (b), it can comprise as the double-sided cardboard sheet | seat 4 by sticking the liner 2 on the both sides of the corrugated core 10. FIG.

  The configuration of the corrugated core 10 will be described in more detail. In the corrugated core 10 of the present embodiment, the arcs of the peak portion 11 and the valley portion 12 have substantially the same radius R. In addition to the above configuration, the corrugated core 10 of the present embodiment has a length ratio of 1.5 to 1 along the waveform between the vertices T with respect to the linear distance between the vertices T of the adjacent peaks 11. .7. Here, “the ratio of the length along the waveform between the vertices T to the linear distance between the vertices T of the adjacent peak portions 11” is the “step rate” when the liner is attached to the core base paper 10. That is, it corresponds to the ratio of the used length of the core base paper to the liner of the unit length. Hereinafter, for the sake of convenience, the term “step rate” is used including the case where the waveform center is described.

  Here, the larger the step pitch D, the smaller the flank angle θ. If the step pitch D is the same, the smaller the step rate, the smaller the flank angle θ, and as a result, the strength against the compressive force acting in the thickness direction. Decreases. On the other hand, if the step pitch D is decreased, the flank angle θ is increased and the strength against the compressive force acting in the thickness direction is increased, but the amount of the core raw paper used is increased. Alternatively, the flank angle θ can also be increased by increasing the step rate, but the amount of core base paper used increases, and if the step rate is too high, the linear portion 13 tilts in the opposite direction. End up. In this embodiment, the number of steps is 22 ± 1 per 30 cm in length, the step rate is 1.5 to 1.7, and the flank angle is 60 to 70 °, which is equivalent to the conventional AB step. While exhibiting the above strength, it is possible to reduce the amount of core base paper used. The number of steps is 22.5 ± 0.5 per 30 cm length, the step rate is 1.65 ± 0.05, and the flank angle θ is 65 ° ± 0.5 °. If so, it is more desirable.

  Next, molding of the corrugated core 10 will be described. As shown in FIG. 3, the core base paper 1 is formed into a waveform by a pair of corrugated rolls 50a and 50b. Here, the corrugated rolls 50a and 50b are substantially cylindrical, and the outer peripheral surface thereof is a corrugated surface including a roll crest 51, a roll trough 52, and a roll straight line 53.

  The core base paper 1 is sent between the corrugated rolls 50a and 50b rotating in opposite directions, and along the roll crest 51, the roll linear part 53, and the roll trough 52 by the meshing of the corrugated rolls 50a and 50b. Molded into a shape. At this time, since a gap for interposing the core raw paper 1 is necessary between the roll crest 51 and the roll trough 52, there is an appropriate difference between the radius of the roll crest 51 and the radius of the roll trough 52. is required.

  In FIG. 3, the adhesive 2 is applied to the corrugated core 10 formed by the corrugated rolls 50 a and 50 b by the glue roll 61, and then the liner 2 is adhered by pressing with the press belt 62, so that the single-sided cardboard Although the example (belt press type) used as the sheet | seat 3 is shown in figure, the sticking system of the liner 2 and the corrugated core 10 is not limited to this. For example, a press roll type in which the liner is pressed against the corrugated core by one roll, or a beltless system in which the liner is pressed against the corrugated core by two rolls (a guide roll and a winding roll) may be used.

  Next, a specific example of this embodiment will be described in comparison with a conventional AB stage. FIG. 4 shows the vertical compressive strength (column strength) with respect to the total basis weight (weight per unit area) of the base paper used for each of the double-sided cardboard sheet of the present embodiment and the conventional AB-stage double-sided cardboard sheet. Shown in graph form. The total basis weight of the double-sided cardboard sheet of the present embodiment is the sum of the basis weights of the core base paper used for the two liners and the corrugated core, and the total basis weight of the AB-stage double-sided cardboard sheet is: This is the total basis weight of the base paper used for the two outer liners, the A-stage corrugated core, the middle liner, and the B-stage corrugated core.

  As shown in FIG. 4, the vertical compressive strengths of the present embodiment and the AB stage each increase almost linearly as the total basis weight increases. And in order to exhibit the vertical compressive strength comparable, it turns out that the total basic weight may be less in the case of this embodiment compared with AB stage | step.

For example, when the double-sided cardboard sheet of the present embodiment is configured using a liner having a basis weight of 200 g / m ^{2 and} a core base paper having a basis weight of 180, the total basis weight is 696 g / m ² and the vertical compressive strength is It was 6.7 KN / m. And as shown using the chain line a in the figure, in order to obtain the same level of strength in the conventional AB stage, about 850 g / m ² , that is, a total basis weight that is 20% or more higher than that of the present embodiment is required. It turns out that it is. Moreover, as shown using the dashed-dotted line b in a figure, if the total basic weight of about 850 g / m < ² > is used, in this embodiment, about 1.5 times the vertical compression strength of AB stage | stage should be exhibited. I understand.

  FIG. 5 shows a box for the total basis weight of a cardboard box having a length of 360 mm, a width of 300 mm, and a height of 250 mm, which is prepared by using the double-sided cardboard sheet of the present embodiment and the conventional AB double-sided double-sided cardboard sheet, respectively. The compressive strength is shown as a graph. From FIG. 5, it can be seen that the box compressive strength has the same tendency as the vertical compressive strength.

  As described above, according to the double-sided corrugated cardboard sheet 4 of the present embodiment provided with the corrugated core 10, the same basis weight as that of the AB stage is exhibited with less total basis weight than the conventional AB-stage double-sided cardboard. Thereby, the double-sided cardboard sheet 4 that is lighter than the AB-staged double-sided cardboard can be used for its application in place of the AB-staged, double-sided cardboard. Further, the double-sided corrugated cardboard sheet 4 uses less raw material or adhesive than the AB double-sided double-sided cardboard, so that costs can be reduced and resources can be saved. Furthermore, since the manufacturing process of the double-sided corrugated cardboard sheet 4 requires fewer steps than the manufacturing process of the AB-stage double-sided corrugated cardboard sheet, it is possible to reduce the time and energy required to operate the manufacturing line.

  In addition, since the double-sided corrugated cardboard sheet 4 of the present embodiment has the same height as a conventional AB-stage double-sided corrugated cardboard sheet, it can be used as a box-making apparatus for processing such as ruled lines, grooving, and cutting. In addition, it is possible to use an apparatus that has been used conventionally. Further, it is possible to process the double-sided corrugated cardboard sheet 4 as it is with the conventional AB-stage box-making line, without the need to adjust the distance between the creaser for making ruled lines and the blade part for grooving / cutting. .

  In addition, the double-sided corrugated cardboard sheet 4 of the present embodiment exhibits a higher vertical compression strength and box compression strength than the AB stage even if the total basis weight is less than the AB stage, so that only one stage is required without being multi-layered. Instead of the AB stage, it can be widely used for applications such as packing heavy goods and transportation.

  Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.

It is a block diagram of the waveform core which is one Embodiment of this invention. It is the block diagram of the (a) single-sided cardboard sheet | seat provided with the corrugated core of FIG. 1, (b) The block diagram of a double-sided cardboard sheet | seat. It is explanatory drawing explaining shaping | molding of a waveform center. It is a graph which shows the vertical compressive strength with respect to gross basic weight with respect to the double-sided corrugated paper sheet of FIG. It is a graph which shows the box compressive strength with respect to gross basic weight with respect to the cardboard box using the double-sided cardboard sheet of FIG.

Explanation of symbols

1 Core raw paper 2 Liner 3 Single-sided cardboard sheet (cardboard sheet)
4 Double-sided corrugated cardboard sheet
10 corrugated core 11 peak 12 valley 13 straight line H height T peak apex θ flank angle (inclination angle of straight line with respect to straight line connecting peaks apex)

Claims (3)

The corrugated core base paper is a corrugated core formed into a corrugated shape,
Crests and troughs formed by arcs;
A straight portion that is tangent to both the peak and the valley,
The height is from 7.9 mm to 8.1 mm,
The number of steps is 22 ± 1 per 30 cm length;
The corrugated core, wherein an inclination angle of the straight line portion with respect to a straight line connecting the apexes of the peak portions is 60 ° to 70 °.   A corrugated sheet comprising a single-sided corrugated sheet having a liner attached to one side of the corrugated core according to claim 1.   3. The corrugated cardboard sheet according to claim 2, wherein the corrugated cardboard sheet is composed of only a double-sided cardboard sheet having a single liner attached to both sides of the corrugated core according to claim 1.

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