WO2021200988A1 - ダンボール材 - Google Patents
ダンボール材 Download PDFInfo
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- WO2021200988A1 WO2021200988A1 PCT/JP2021/013605 JP2021013605W WO2021200988A1 WO 2021200988 A1 WO2021200988 A1 WO 2021200988A1 JP 2021013605 W JP2021013605 W JP 2021013605W WO 2021200988 A1 WO2021200988 A1 WO 2021200988A1
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- corrugated cardboard
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- cardboard material
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/08—Corrugated paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/08—Creasing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/20—Corrugating; Corrugating combined with laminating to other layers
- B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2554/00—Paper of special types, e.g. banknotes
Definitions
- the present invention relates to a corrugated cardboard material.
- a bellows-folded (also called “fan fold”) cardboard material As a box-making material, a bellows-folded (also called “fan fold") cardboard material is known.
- the corrugated cardboard material is provided with creases between continuous rectangular sheets, and the sheets are alternately folded back at the folds.
- continuous sheets are stacked one above the other and folded into a rectangular parallelepiped packaging.
- the folding device for manufacturing the bellows-folded corrugated cardboard material includes a folding part for alternately folding continuous sheets at folds and a stacking part for stacking the folded sheets (for example, Patent Document 1 below). reference).
- a folding part for alternately folding continuous sheets at folds and a stacking part for stacking the folded sheets (for example, Patent Document 1 below). reference).
- the stacking part continuous sheets must be folded in contact with each other without leaving a gap. desirable.
- the above cardboard materials are box-making systems (“automatic packaging system”, “three-side variable system”, “three-side automatic packaging”, and “on-demand packaging” that manufacture boxes of the optimum size according to the size of the object to be packaged. It is also used as a packaging material.
- various steps illustrated below are carried out (see Patent Document 2 below).
- ⁇ Feed process Process of feeding out bellows-folded cardboard material
- ⁇ Cutting process Process of cutting out flat cardboard material fed in the feed process
- Folding process Process of assembling a box from the cardboard material cut out in the cutting process
- Printing process The process of printing on a flat or assembled cardboard material
- Packing process The process of storing the contents in the assembled box
- a corrugated cardboard material having creases such as a bellows-folded corrugated cardboard material
- tears tears
- Another object of the present invention is to prevent the box manufactured by using the corrugated cardboard material from being torn (damaged).
- one of the purposes is to suppress the creases at the creases. Not limited to this purpose, it is also possible that the actions and effects derived from each configuration shown in the “mode for carrying out the invention” described later and which cannot be obtained by the conventional technique are exhibited. It can be positioned as another purpose.
- the corrugated cardboard material disclosed here is a corrugated cardboard material using a corrugated cardboard in which a liner is attached to a core.
- This cardboard material has a dynamic viscoelasticity within a predetermined range measured by a measurement piece cut out from the liner in a tensile shear mode under a vibration condition of a frequency of 100 [Hz] under a temperature condition of 25 [° C.].
- the dynamic viscoelasticity is defined by the value of the elastic modulus E ′ and tan ⁇ , which is the ratio of the loss elastic modulus E ′′ to the elastic modulus E ′.
- the elastic modulus E' is 1.00 ⁇ 10 9 [Mpa] or more and 8.00 ⁇ 10 9 [Mpa] or less
- the tan ⁇ is 2.50 ⁇ 10 ⁇ 2 or more. It is 1.50 x 10 -1 or less.
- the corrugated cardboard material disclosed here is a corrugated cardboard material using a corrugated cardboard in which a liner is attached to a core.
- the amount of the sizing agent added to the liner is 0.2 [parts by mass] or more and 4.0 [parts by mass] or less, and the paper strength enhancer added to the liner.
- the amount added is 0.1 [parts by mass] or more and 4.0 [parts by mass] or less, and the average length of the pulp fibers constituting the liner is 0.90 [mm] or more and 1 Of the pulp fibers constituting the liner having a fiber length of .55 [mm] or less, the amount of fine fibers having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less is 23. It is [%] or more and 48 [%] or less.
- the corrugated cardboard material disclosed here is a corrugated cardboard material using a corrugated cardboard in which a liner is attached to a core.
- the density of the liner is 0.60 [g / cm 3 ] or more and 0.85 [g / cm 3 ] or less
- the average fiber length of the pulp fibers constituting the liner is 0.98 [mm] or more and 1.55 [mm] or less
- the fiber length is 0.0 [mm] or more and 0.2 [mm] or less.
- the content of the fine fibers is 15 [%] or more and 38 [%] or less.
- corrugated cardboard material as an embodiment will be described.
- the corrugated cardboard material mainly exemplified in the present embodiment is a bellows-folded box-making material in which a rectangular sheet is folded in continuous corrugated cardboard.
- corrugated cardboard material double-sided corrugated cardboard having liners on both sides with respect to the core is used.
- the above double-sided cardboard includes single-flute cardboard composed of three base papers (materials) corresponding to one core and two liners, as well as so-called “double-sided cardboard” and “double-sided cardboard". Also included is multi-flute cardboard composed of three or more cores and five or more base papers corresponding to each of the two liners.
- a corrugated cardboard material composed of double-sided corrugated cardboard of a single flute is mainly exemplified.
- the corrugated cardboard material used as the box-making material of the box-making system has a feed process in which the sheets are sent out in sequence, a cutting process in which the sent-out sheets are cut out in a box development pattern, and folding into a box shape. It is made into a cardboard box through various processes such as a folding process in which it is erected.
- the box-making system for assembling the cardboard box is not particularly limited, but for example, "Carton Wrap 1000 manufactured by CMC", “CVP-500 manufactured by Neopost", and “OS Machinery Co., Ltd.”, which are fully automatic systems for automatic packaging systems.
- the TXP-600 manufactured by the manufacturer, the semi-automatic system "EM7 manufactured by Pack Size", and the Compaq manufactured by Panotec can be used.
- the vertical direction (first direction, marked as "CD” in the figure) and the horizontal direction (second direction, marked as “MD” in the figure) are horizontal directions and along the sheet (crease). The direction in which the plane extends. These vertical and horizontal directions are orthogonal to each other.
- the height direction (third direction, indicated by "TD” in the figure) is a direction along the vertical direction and is orthogonal to both the vertical direction and the horizontal direction. This height direction corresponds to the direction in which the sheets are overlapped.
- the MD (Machine Direction) direction is also referred to as a "flow direction", and is a direction in which the corrugated cardboard material manufacturing process progresses from upstream to downstream.
- the CD (Cross Direction) direction is a direction orthogonal to the MD direction in a plane along the MD direction.
- the TD (Transverse Direction) direction is a direction orthogonal to both the MD direction and the CD direction.
- the expression "numerical value X to numerical value Y" in this embodiment means a range of numerical value X or more and numerical value Y or less.
- Item [1] describes a structure in which the corrugated cardboard material is folded (hereinafter referred to as “folded structure”).
- Item [2] describes parameters related to the properties of the sheet (corrugated cardboard sheet) used for the corrugated cardboard material. Then, the actions and effects of the configurations of items [1] and [2] will be described in item [3].
- the corrugated cardboard material 1 is a box-making material having a rectangular parallelepiped shape.
- a continuous rectangular sheet 2 (only a part of which is coded in FIG. 1) is folded back at a crease F (only a part of the sheet 2 is coded in FIG. 1), and the folded sheet 2 is folded. Stacked in the height direction.
- a plurality of folds F extend linearly along the vertical direction on a pair of side surfaces along both the vertical direction and the height direction.
- the first fold F1 is provided between the first sheet 21 and the second sheet 22, and the sheets 21 and 22 are continuous via the first fold F1.
- a second fold F2 is provided between the second sheet 22 and the third sheet 23, and the sheets 22 and 23 are continuous via the second fold F2.
- the first fold F1 is a fold F in which the second sheet 22 is folded back toward one side in the lateral direction (to the right in FIG. 1) with respect to the first sheet 21, and the other side in the corrugated cardboard material 1 (right side in FIG. 1). It is arranged on the left side in FIG.
- the second fold F2 is a fold F in which the third sheet 23 is folded back toward the other side (left in FIG. 1) with respect to the second sheet 22, and the second fold F2 is the one in the corrugated cardboard material 1 in the lateral direction (the second fold F2). It is arranged on the right side in FIG.
- the corrugated cardboard step 10 (in FIG. 1, only the front edge is marked) extends to the first edge E 1 extending in the lateral direction (the direction intersecting the crease F). Waves) are exposed.
- the cardboard is provided on the second edge E 2 extending in the lateral direction (the direction intersecting the crease F) (in FIG. 1, only the front edge is marked). The step 10 is exposed.
- the first end edge E 1 and the second end edge E 2 are arranged adjacent to each other in the height direction.
- the corrugated cardboard material 1 having the above-mentioned folding structure even a material that is difficult to be wound in a roll shape can be folded into a rectangular parallelepiped shape. That is, the corrugated cardboard sheet 2 having a higher strength than the material that can be wound in a roll shape can be made into a compact packaging.
- the corrugated cardboard material 1 in which the sheet 2 whose strength is ensured is folded in this way is suitable for use as a packaging material for a box-making system for manufacturing a box in which strength is required.
- the fold F is provided along the corrugated cardboard step 10.
- the corrugated cardboard material 1 having a step 10 perpendicular to the MD direction is manufactured.
- the corrugated cardboard material 1 is preferably wrapped (wrapped) with a packaging film in order to prevent stains and collapse of the load.
- the size of the corrugated cardboard material 1 is determined from the following dimensions L1 to L3.
- -Vertical dimension L1 Vertical dimension (first dimension) -Horizontal dimension
- L2 Horizontal dimension (second dimension) -Height dimension
- L3 Dimension in the height direction (third dimension)
- the dimensions L1 to L3 are preferably in the range shown in Table 2 below.
- the number of folds F in the corrugated cardboard material 1 is N [sheets]
- the number of sheets 2 is N + 1 [sheets].
- the N + 1 [stage] sheets 2 are overlapped on the cardboard material 1.
- the number of stages of the corrugated cardboard material for example, various stages of 10 to 1000 [stages] can be mentioned.
- the corrugated cardboard material to which the parameters related to folding, which will be described in detail later, are measured it is preferable to measure the parameters at each of all the stages for the measurement target having less than a predetermined number of stages (for example, 100 [stages]).
- the parameters may be measured partially (for example, a portion divided into parts or a set area).
- An arbitrary basis weight can be set for the sheet 2 used for the corrugated cardboard material 1.
- the range of the basis weight adopted for the sheet 2 includes a range of 50 to 1500 [g / m 2 ], preferably a range of 100 to 1000 [g / m 2 ], and more preferably 200 to 200.
- the range of 800 [g / m 2 ] is mentioned, and more preferably the range of 200 to 600 [g / m 2 ] is mentioned.
- the weight of the corrugated cardboard material 1 is calculated by adding the step ratio of the core to the above basis weight and multiplying the vertical dimension L1 and the horizontal dimension L2 by the number of steps N + 1 of the sheet 2.
- the corrugated cardboard material 1 of the present embodiment has a configuration A relating to its properties, based on the viewpoint of improving the packing shape of the corrugated cardboard material 1. Specifically, it has a predetermined configuration A regarding properties based on the following viewpoints I and II.
- the “packing form of the corrugated cardboard material 1” is the appearance of the bellows-folded cardboard material 1 folded in a rectangular parallelepiped shape.
- -Viewpoint I Ensuring folding retention at fold F
- F-Viewpoint II Suppressing rule cracking at fold F
- the above viewpoints I and II are for solving the following problems I and II. It is a viewpoint.
- ⁇ Problem I Folding at crease F opens
- Problem II Rule cracking occurs at fold F
- the "folded-back holding property" in the above viewpoint I is a performance of holding the sheet 2 in a folded state at the fold F.
- "Opening the fold at the fold F" in the task I means that when the sheet 2 is folded at the fold F, the folded state is not maintained and the sheets 2 that are continuous through the fold F are connected to each other. There is a gap between them.
- Problem I arises when the folding retention is insufficient. It can be said that the problem I is a problem that the packing shape of the corrugated cardboard material 1 is disturbed by folding back and opening at the fold F.
- the "ruled crack” is a crack (damage, tear) that occurs in the liner located outside the fold F when the sheet 2 is folded back at the fold F.
- the configuration of the folding device for manufacturing the bellows-folded corrugated cardboard material 1 and the quality of the package of the manufactured corrugated cardboard material 1 are sub-items [i] and [ii]. It will be explained in. Then, a predetermined configuration based on the viewpoints I and II will be described in the sub-item [iii].
- the folding device 50 shown in FIG. 2 is a device that folds corrugated cardboard continuous in a strip shape into a bellows fold.
- the folding device 50 is not particularly limited, but for example, the following folding device can be used.
- -Folding device BHS Corrugated Machinery Co., Ltd., Product number "AS-F"
- the folding device 50 includes a transport part 50A, a folding part 50B, and a stacking part 50C.
- the transport part 50A forms a transport path for transporting the strip-shaped cardboard web 1W manufactured by the corrugated cardboard production device (corrugator) on the upstream side (not shown) to the folding part 50B (see the alternate long and short dash line in FIG. 2).
- the corrugated cardboard web 1W manufactured by a corrugated board (not shown) is provided with a plurality of folds F at regular intervals in the lateral direction.
- Sheets 2 are continuous on the upstream side and the downstream side of each fold F.
- the upstream sheet is folded back toward one side (right side in FIG. 2) with respect to the downstream sheet (at the "first fold F1" in FIG. 1).
- the fold corresponds to the "second fold F2" in FIG. 1) in which the upstream sheet is folded back toward the other side (left in FIG. 2) in the lateral direction with respect to the downstream sheet.
- the first fold F1 and the second fold F2 are alternately arranged along the transport direction.
- the surface facing upward in the transport part 50A is referred to as the front surface (Omotemen) of the cardboard web 1W, and the surface facing downward is referred to as the back surface (Uramen) of the cardboard web 1W.
- the first fold F1 is formed by a groove recessed in the front surface of the cardboard web 1W
- the second fold F2 is formed by a groove recessed in the back surface of the cardboard web 1W in each of the above directions. Makes sure that the cardboard is folded back.
- the folding part 50B is provided between the transport part 50A and the stacking part 50C, and is a part in which the corrugated cardboard web 1W transported by the transport part 50A is alternately folded back at the fold F and fed to the stacking part 50C.
- the cardboard web 1W transported from the transport part 50A is pushed downward in the transport direction.
- the upstream sheet is folded back toward one of the lateral directions (to the right in FIG. 2) with respect to the downstream sheet, and in the second fold F2, the upstream sheet is downstream. It is folded back toward the other side (left side in FIG. 2) in the lateral direction with respect to the side sheet.
- the folding part 50B may be provided with an auxiliary mechanism (not shown) that assists the folding of the cardboard web 1W.
- the auxiliary mechanism is a mechanism for assisting the sheets forming the cardboard web 1W to be surely folded back alternately at the first fold F1 and the second fold F2.
- the specific structure of the auxiliary mechanism is not particularly limited, but for example, a rotation mechanism provided with a rod that supports the second fold F2 (see Patent Document 1 above) can be used.
- the stacking part 50C is a part for stacking (stacking) sheets that are alternately folded back in the folding part 50B.
- the stacking part 50C is arranged below the folding part 50B. Therefore, in the stacking part 50C, the sheets 2 (see FIG. 1) that are alternately folded back at the folds F1 and F2 are sequentially stacked from the bottom to the top. In this way, the bellows-folded corrugated cardboard material 1 having a rectangular parallelepiped packing shape is manufactured.
- the corrugated cardboard material 1 has the following configuration 1A as the configuration A corresponding to the above viewpoints I and II and the problems I and II.
- -Structure 1A The dynamic viscoelasticity of the liner constituting the cardboard material 1 is within a predetermined range. "Dynamic viscoelasticity” means three types of elastic modulus E ′, loss elastic modulus E ′′, and tan ⁇ . It is a parameter defined by the value, and is a parameter corresponding to the retention in the folded state when the cardboard material 1 is bent (difficulty in opening the crease F) and the difficulty in causing rule cracking in the crease F. be.
- the elastic modulus E' represents the strength of elasticity, and corresponds to the repulsive force that tries to return to the original shape (that is, to open the fold F) when the corrugated cardboard material 1 is bent.
- the elastic modulus E ′′ represents the strength of viscosity.
- tan ⁇ is the ratio of the loss elastic modulus E ′′ to the elastic modulus E ′ according to the following equation 1. If this tan ⁇ is a value of "1" or less, it means that it has the physical properties of an elastic region (a region that tries to return to its original shape), and otherwise it is a viscous region (a region that is difficult to return to its original shape). It means having physical characteristics.
- tan ⁇ E ′′ / E ′ ... Equation 1 The larger the value of tan ⁇ , the smaller the repulsive force, and the smaller the value of tan ⁇ , the larger the repulsive force.
- the inventors of the present application have stated that if the elastic moduli E'and tan ⁇ of the dynamic viscoelasticity of the liner constituting the cardboard material 1 are within a predetermined range, the above-mentioned problems I and II tend to be suppressed. I got the knowledge of. Conversely, it was found that corrugated cardboard materials using a dynamic viscoelastic liner outside the predetermined range tend to cause problems I and II. That is, the corrugated cardboard material 1 is provided with the above configuration 1A based on the above viewpoints I and II.
- the elastic modulus E' is 1.00 ⁇ 10 9 [Mpa] or more and 8.00 ⁇ 10 9 [Mpa] or less, and tan ⁇ is 2.50 ⁇ 10 -2 or more and 1.50 ⁇ . It is 10 -1 or less.
- the elastic modulus E' is preferably 1.50 ⁇ 10 9 [Mpa] or more and 7.00 ⁇ 10 9 [Mpa] or less, and is preferably tan ⁇ , in that it is suitable for producing a bellows-folded corrugated cardboard material.
- the elastic modulus E' is 2.00 ⁇ 10 9 [Mpa] or more and 6.00 ⁇ 10 9 [Mpa] or less, and tan ⁇ . Is more preferably 3.50 ⁇ 10 ⁇ 2 or more and 9.70 ⁇ 10 ⁇ 2 or less.
- the elastic modulus E' is preferably 3.00 ⁇ 10 9 [Mpa] or less, the tan ⁇ is 7.00 ⁇ 10 ⁇ 2 or more, and the elastic modulus E ′ is 2.50 ⁇ . It is more preferable that the value is 10 9 [Mpa] or less and the tan ⁇ is 8.00 ⁇ 10-2 or more.
- the elastic modulus E'is 4.00 ⁇ 10 9 [Mpa] or more and tan ⁇ is 4.00 ⁇ 10 -2 or less
- the elastic modulus E'is 4.50 ⁇ 10 9 It is more preferable that it is [Mpa] or more and tan ⁇ is 3.80 ⁇ 10-2 or less.
- the corrugated cardboard material 1 of the present embodiment has a configuration B related to properties, based on the viewpoint of making it possible to manufacture a box that is hard to tear when used as a box-making material. Specifically, it has a predetermined configuration B regarding properties based on the following viewpoint III.
- -Viewpoint III Suppressing tearing (damage) of the assembled box
- the above-mentioned viewpoint III is a viewpoint for solving the following problem III.
- ⁇ Problem III Easy to tear the assembled box
- creases F may be included in the bottom surface and side surfaces of the assembled box.
- tears tend to occur easily starting from the crease F. Therefore, it can be said that the above-mentioned problem I is a problem that easily causes the box assembled by using the bellows-folded cardboard material 1 to be torn.
- the tear starting from the crease F above tends to occur more easily under high humidity conditions. Therefore, it can be said that the above-mentioned problem I is a problem that easily causes the box assembled by using the bellows-folded cardboard material 1 to be torn under high humidity conditions.
- the corrugated cardboard material 1 has the following configurations B1 to B4 as the configuration B corresponding to the above viewpoint III and the problem III.
- -Structure B1 The amount of sizing agent added is within a predetermined range-Structure
- B2 The amount of paper strength enhancer added is within a predetermined range-Structure
- B3 Length of fiber length Average fiber length is a predetermined length Within the range ⁇ Composition B4: The amount of fine fibers is within the predetermined range
- the "sizing agent” is a chemical added to the liner forming the cardboard material 1 in order to impart surface characteristics such as sizing property (a function of preventing water penetration and ink bleeding) and printability to the liner.
- the amount of sizing agent added [parts by mass] is the ratio of the amount of sizing agent added [parts by mass] to the total of 100 [parts by mass] of all pulp constituting the liner.
- the "paper strength enhancer” is a chemical added to the liner forming the corrugated cardboard material 1 in order to improve the surface strength of the liner and prevent the generation of paper dust during printing.
- the amount of the paper strength enhancer added [parts by mass] is the ratio of the amount of the paper strength enhancer added [parts by mass] to a total of 100 [parts by mass] of all the pulp constituting the liner.
- the “length average fiber length” is the average length (fiber length) of the pulp fibers constituting the liner. This average length fiber length is the average length of pulp fibers containing the following fine fibers.
- the “fine fiber amount” is the ratio [%] of the amount of fine fibers contained to the total (100 [%]) of the pulp fibers constituting the liner.
- the fine fiber is a fine fiber having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less.
- the inventors of the present application have found that if the liner forming the corrugated cardboard material 1 has the above-mentioned configurations B1 to B4, the above-mentioned problem III tends to be suppressed. Conversely, it has been found that a corrugated cardboard material using a liner that does not have at least one of the above configurations B1 to B4 tends to cause problem III. That is, the corrugated cardboard material 1 is provided with the above configurations B1 to B4 based on the above-mentioned viewpoint III.
- the average fiber length of the fiber length is less than the predetermined length range. If so, it is presumed that the strength of the liner is insufficient and causes problem III. If the amount of the sizing agent added exceeds a predetermined range, it is presumed that the sizing agent inhibits the hydrogen bond between the pulp fibers constituting the liner, which causes the problem III.
- the strength of the liner tends to increase as the amount of the paper strength enhancer added increases, but when the amount of the paper strength enhancer added exceeds a predetermined range, the paper strength enhancer aggregates and the strength decreases. Therefore, it is presumed that this will lead to Problem III.
- the average length fiber length The longer the average length fiber length, the stronger the liner strength tends to be.
- the average length fiber length exceeds a predetermined length range, there are many gaps between the pulp fibers, which causes problem III. It is presumed to be. In particular, under high humidity conditions, it is presumed that water is easily absorbed in the gaps between the pulp fibers, and that problem III is more likely to occur.
- the proportion of pulp fibers (long fibers) having a long fiber length increases and the gaps between the long fibers increase, which is presumed to lead to Problem III.
- the amount of fine fibers exceeds a predetermined range, the proportion of long fibers is reduced and the entanglement of pulp fibers is reduced, which is presumed to lead to Problem III.
- the amount of the sizing agent added is 0.2 [parts by mass] or more and 4.0 [parts by mass] or less, preferably 0.5 [parts by mass] or more and 3.0 [parts by mass] or less. It is more preferably 0.8 [parts by mass] or more and 2.0 [parts by mass] or less.
- the amount of the paper strength amplifying agent added is 0.1 [parts by mass] or more and 4.0 [parts by mass] or less, preferably 0.5 [parts by mass] or more and 3.5 [parts by mass]. ] Or less, more preferably 1.0 [parts by mass] or more and 3.0 [parts by mass] or less.
- the average fiber length is 0.90 [mm] or more and 1.55 [mm] or less, preferably 1.00 [mm] or more and 1.53 [mm] or less, and more. It is preferably 1.30 [mm] or more and 1.52 [mm] or less.
- the amount of fine fibers is 23 [%] or more and 48 [%] or less, preferably 30 [%] or more and 47 [%] or less, and more preferably 40 [%] or more. It is 46 [%] or less.
- the corrugated cardboard material 1 of the present embodiment has a configuration C related to properties, based on the viewpoint of making it difficult for tears (rules) to occur at the crease F. Specifically, it has a predetermined configuration C regarding properties based on the following viewpoint IV.
- -Viewpoint IV Suppressing the rule division at the crease F
- the above-mentioned viewpoint IV is a viewpoint for solving the following problem IV.
- -Problem IV It is easy to cause creases at the crease F.
- the crease F of the bellows-folded corrugated cardboard material 1 is a place where continuous sheets are folded back by 180 [°].
- the corrugated cardboard material 1 has the following configurations C1 to C3 as the configuration C corresponding to the above viewpoint IV and the problem IV.
- -Structure C1 The liner density is within a predetermined range-Structure
- C2 Fiber length average fiber length is within a predetermined length range-Structure
- C3 Fine fiber amount is within a predetermined range
- the "Density” is a parameter representing the weight [g] per volume 1 [cm 3 ] of the liner forming the cardboard material 1.
- the “length average fiber length” is the average length (fiber length) of the pulp fibers constituting the liner. This average length fiber length is the average length of pulp fibers containing the following fine fibers.
- the “fine fiber amount” is the ratio [%] of the amount of fine fibers contained to the total (100 [%]) of the pulp fibers constituting the liner.
- the fine fiber is a fine fiber having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less.
- the inventors of the present application have found that if the liner forming the corrugated cardboard material 1 has the above-mentioned configurations C1 to C3, the above-mentioned problem IV tends to be suppressed. Conversely, it has been found that a corrugated cardboard material using a liner that does not have at least one of the above configurations C1 to C3 tends to cause problem IV. That is, the corrugated cardboard material 1 is provided with the above configurations C1 to C3 based on the above-mentioned viewpoint IV.
- the density is below the predetermined range, it is presumed that many gaps between the pulp fibers are generated and the strength of the liner becomes insufficient, which causes the problem IV.
- the density exceeds a predetermined range, it is presumed that when the gap between the pulp fibers disappears and the liner is bent, it becomes difficult for the stress to escape, which causes the problem IV.
- the shorter the average length fiber length the lower the strength of the liner tends to be. If the average length fiber length is less than the predetermined length range, the strength of the liner becomes insufficient, which causes problem IV. Inferred.
- the length average fiber length tends to increase the strength of the liner, but if the length average fiber length exceeds a predetermined length range, the distribution of pulp fibers tends to be uneven and the strength is locally increased. It is presumed that there will be a place where the value is low, which will lead to problem IV. If the amount of fine fibers is less than a predetermined range, it is presumed that the proportion of pulp fibers (long fibers) having a long fiber length increases and the gaps between the long fibers increase, which causes problem IV. If the amount of fine fibers exceeds a predetermined range, it is presumed that the proportion of long fibers decreases, the entanglement between pulp fibers decreases, the strength of the liner becomes insufficient, and problem IV is caused.
- the liner density is 0.60 [g / cm 3 ] or more and 0.85 [g / cm 3 ] or less, preferably 0.65 [g / cm 3 ] or more and 0.84 [g / cm 3] or more. It is g / cm 3 ] or less, more preferably 0.80 [g / cm 3 ] or more and 0.83 [g / cm 3 ] or less.
- the average fiber length is 0.98 [mm] or more and 1.55 [mm] or less, preferably 1.00 [mm] or more and 1.53 [mm] or less, and more. It is preferably 1.10 [mm] or more and 1.52 [mm] or less.
- the amount of fine fibers is 15 [%] or more and 38 [%] or less, preferably 17 [%] or more and 37 [%] or less, and more preferably 18 [%] or more. It is 36 [%] or less.
- the corrugated cardboard material 1 of the present embodiment includes the above-mentioned configuration A, when the corrugated cardboard material 1 is folded back at the fold F, the folding at the fold F does not open, and the fold F is ruled. Since cracks are unlikely to occur, it is possible to achieve both ensuring folding retention and suppressing ruled cracks. Therefore, for example, the bellows-folded corrugated cardboard material 1 ensures the shape and stability of the packaging.
- the corrugated cardboard material 1 of the present embodiment is provided with the above-mentioned configuration B, so that the strength of the liner forming the corrugated cardboard material 1 is ensured, so that the box manufactured by using the corrugated cardboard material 1 can be torn. Can be suppressed. Especially under high humidity conditions, tearing starting from the crease F can be suppressed.
- the corrugated cardboard material 1 of the present embodiment is provided with the above-mentioned configuration C, so that the corrugated cardboard material 1 is torn (ruled) at the crease F. It can suppress the percentage).
- the corrugated cardboard material whose parameters are measured (hereinafter referred to as “measured corrugated cardboard material”) is a double-sided corrugated cardboard sheet.
- This measured corrugated cardboard material has the following size. ⁇ Size: Vertical dimension 1300 [mm], Horizontal dimension 1150 [mm], Height dimension 1800 [mm]
- any one of the following product numbers "No. 1" to "No. 6" was used as the liner base paper.
- ⁇ No. 1 Basis weight 120 [g / m 2 ], freeness 400 [ml]
- No. 2 Basis weight 160 [g / m 2 ], freeness 400 [ml]
- No. 3 Basis weight 170 [g / m 2 ], freeness 400 [ml]
- No. 4 Basis weight 210 [g / m 2 ], freeness 400 [ml] ⁇
- No. 5 Basis weight 120 [g / m 2 ], freeness 300 [ml]
- No. 6 Basis weight 120 [g / m 2 ], freeness 600 [ml]
- the liner base paper of product number "No. 1" is made from softwood kraft pulp and corrugated cardboard pulp with a freeness of 400 [ml], and is used for corrugated cardboard, which is composed of three layers by making paper using a multi-layer paper machine. Created as liner base paper.
- the papermaking conditions include a cationic paper strength enhancer in an amount of 0.5 [parts by mass] with respect to a total of 100 [parts by mass] of the total pulp of the paper layer, and among the pulps on the surface layer, 10 softwood kraft pulps are contained. It was contained in a proportion of [mass%]. In addition, all the cationic paper strength enhancers were contained in the surface layer. The softwood kraft pulp accounted for 6 [mass%] of the total pulp in the paper layer.
- the liner base paper of product number "No. 2" was prepared by the same production method as the liner base paper of "No. 1” except that the basis weight was changed to 160 [g / m 2].
- the liner base paper of product number "No. 3” has changed the proportion of softwood kraft pulp in the surface layer pulp to 50 [mass%] and the basis weight to 170 [g / m 2 ]. It was created by the same method as the "No. 1" liner base paper.
- the liner base paper of product number "No. 4" was prepared by the same production method as the liner base paper of "No. 1” except that the basis weight was changed to 210 [g / m 2].
- the liner base paper of product number "No. 5" was prepared by the same preparation method as the liner base paper of "No. 1” except that the freeness of softwood kraft pulp and corrugated cardboard waste paper pulp was changed to 300 [ml].
- the liner base paper of product number "No. 6” was prepared by the same preparation method as the liner base paper of "No. 1” except that the freeness of softwood kraft pulp and corrugated cardboard waste paper pulp was changed to 600 [ml].
- Freeness is a parameter that indicates the degree to which the pulp that is the raw material of the base paper is beaten.
- Pulp beating is a mechanical process of beating and grinding (grinding) pulp fibers, and is carried out using a well-known refiner (mechanical processing equipment). The value of freeness can be adjusted by setting the refiner.
- the step of beating the pulp (beating step) is carried out immediately before the papermaking process in the base paper manufacturing process. In this beating step, in addition to beating the pulp used for papermaking, a process of blending chemicals with the pulp is performed.
- Examples A1 to A6 and Comparative Examples A7 and A8 a core base paper of any one of the following product numbers "No. 7" and "No. 8" was used as the core.
- ⁇ No. 7 Basis weight 120 [g / m 2 ] [OND-EM120: manufactured by Oji Materia Co., Ltd.]
- ⁇ No. 8 Basis weight 160 [g / m 2 ] [OND-EM160: manufactured by Oji Materia Co., Ltd.]
- Each of the measured corrugated cardboard materials of Examples A1 to A6 and Comparative Examples A7 and A8 is double-sided corrugated cardboard having a total thickness [mm] shown in Table 3.
- the dynamic viscoelasticity was measured using the measurement sample pieces (measurement pieces) taken out from the measurement cardboard materials of Examples A1 to A6 and Comparative Examples A7 and A8 in the following procedures A1 to A5.
- Step A1 The measurement sheet is cut out from an arbitrary stage above the middle stage based on half the total number of stages of the corrugated cardboard material (that is, the middle stage). Specifically, when the total number of stages M of the measured corrugated cardboard material is an odd number, a sheet is collected and measured based on the stage obtained by rounding off half the number of stages M / 2 of the total number of stages of the measured corrugated cardboard material (that is, the middle stage). When the total number of stages M of the corrugated cardboard material was an even number, a sheet was collected based on the number of stages [(M / 2) + 1], which is half of the total number of stages of the measured corrugated cardboard material.
- Step A2 The measurement sheet collected in Step A1 is immersed in tap water for 15 [minutes].
- Step A3 The measurement sheet immersed in step A2 is taken out from tap water, and each of the liner base papers (front liner and back liner) of the taken out measurement sheet is peeled off by hand so that the liner base paper is not torn. Separate from the core base paper.
- Step A4 The liner base paper separated in step A3 is dried in a dryer at 105 [°] for 20 [minutes].
- Step A5 A sample piece for measurement having the following dimensions is cut out from the liner base paper dried in step A4. > Dimensions ⁇ Vertical direction: 5 [mm] ⁇ Horizontal direction: 30 [mm]
- the dynamic viscoelasticity (elastic modulus E ′, loss elastic modulus E ′′, tan ⁇ ) of the measurement sample piece cut out in the above procedure A5 was measured using the following equipment under the following conditions. For the measurement, a sample piece for measurement cut out from the liner base paper of the front liner was used. Even when the measurement sample piece cut out from the liner base paper of the back liner is used, there is no difference or substantially no difference in the measurement result from the case where the measurement sample piece of the front liner is used.
- the measurement corrugated cardboard material to be evaluated is a double-sided corrugated cardboard web manufactured in the following manufacturing process folded into a bellows fold in the following folding process.
- the manufacturing process includes the following procedures B1 to B4.
- a well-known corrugator equipped with a single facer and a double facer is used for manufacturing the double-sided cardboard web.
- -Procedure B1 A step (wave) is formed on the core base paper supplied from the core base paper roll, and an adhesive is applied to the step top of the formed step.
- -Procedure B2 The liner base paper for the back liner supplied from the back liner base paper roll is attached to the core base paper coated with the adhesive in step B1, and this is pressed and heated by the roll to adhere. , Forming a single-sided cardboard web (processing with a single facer).
- -Procedure B3 The liner base paper for the front liner supplied from the base paper roll for the front liner is adhered to the core side of the single-sided cardboard web formed in the procedure B2 with an adhesive, and this is applied by pressing and heating rolls.
- -Procedure B4 With respect to the double-sided cardboard web created in step B3, creases extending in the width direction are formed at regular intervals in the extending direction.
- a one-tank type starch paste which is usually used, was used as the adhesive for adhering the liner base paper and the core base paper in steps B1 and B2.
- An emulsion such as a synthetic resin may be used for bonding the liner base paper and the core base paper.
- the synthetic resin include polyethylene, polypropylene, polyamide, polyester, ethylene-unsaturated carboxylic acid copolymer, styrene-butadiene copolymer, butadiene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, and poly. Examples thereof include vinyl acetate, ethylene-vinyl acetate copolymer, polyacrylic acid ester-based copolymer, and styrene-acrylic acid ester copolymer.
- an adhesive layer is formed by applying extrusion lamination or a synthetic resin emulsion coating to the liner base paper or the core base paper. Then, a method of superimposing the liner base paper and the core base paper, or a method of interposing a synthetic resin film between the liner base paper and the core base paper and pressurizing and heating them to bond them may be adopted.
- the double-sided cardboard web created in the above manufacturing process is folded into a bellows fold in a folding process including the following procedures C1 and C2.
- the following folding device is used under the following conditions.
- -Folding device BHS Corrugated Machinery product number "AS-F”, ⁇ Transportation speed: 100 [m / min]
- -Procedure C1 After step B4, the created double-sided cardboard web is transported to the folding device described above (see transport part 50A in FIG. 2).
- -Procedure C2 The double-sided corrugated cardboard web transported in step C1 is alternately folded back at a fold and folded into a bellows fold to prepare a corrugated cardboard material for measuring the bellows fold of the above-mentioned packing size (folding part 50B in FIG. 2, See stacking part 50C).
- the appearance of the measured corrugated cardboard material prepared in the above procedure C2 was visually confirmed and evaluated according to the following criteria.
- - ⁇ The corrugated cardboard material to be measured can be prepared, and no gap [see reference numeral S in FIG. 3B] is formed at any of the folds.
- - ⁇ A corrugated cardboard material for measurement can be produced, but a gap [see reference numeral S in FIG. 3B] is generated at one or more creases.
- ⁇ ⁇ The measurement cardboard material could not be created. In the evaluation of stackability, " ⁇ " or higher was regarded as a good evaluation.
- the "folded portion" is an area including the periphery of the fold.
- ⁇ ⁇ No creases were found at all creases.
- - ⁇ One [pieces] or more of creases were found in a part in the width direction.
- -X At one [pieces] or more of creases, one [pieces] or more of rule cracks were observed over the entire width in the width direction.
- " ⁇ " or higher was regarded as a good evaluation.
- the elastic modulus E' is 1.00 ⁇ 10 9 [Mpa] or more and 8.00 ⁇ 10 9 [Mpa] or less, and tan ⁇ is 2.50 ⁇ 10 -2 or more. It was 1.50 ⁇ 10 -1 or less, and the stacking property and the rule-dividing property were evaluated as “ ⁇ ” or more.
- “ ⁇ ” is obtained for the rule-dividing property.
- the stacking property was evaluated as " ⁇ ".
- the elastic modulus E' is less than 1.00 ⁇ 10 9 [Mpa] or greater than 8.00 ⁇ 10 9 [Mpa], and tan ⁇ is less than 2.50 ⁇ 10 -2 or 1.50 ⁇ 10 -1 .
- Comparative Examples A7 and A8, which were also large an evaluation of "x" was obtained for stacking property or rule-splitting property.
- Comparative Example A7 in which the elastic modulus E'was larger than 8.00 ⁇ 10 9 [Mpa] and tan ⁇ was less than 2.50 ⁇ 10 -2 the rule-breaking property was evaluated as “ ⁇ ”, but the stacking property was obtained. A rating of "x" was obtained.
- the elastic modulus E' is 1.00 ⁇ 10 9 [Mpa] or more and 8.00 ⁇ 10 9 [Mpa] or less, and tan ⁇ is 2. If it is 50 ⁇ 10 -2 or more and 1.50 ⁇ 10 -1 or less, when the measurement cardboard material is folded back at the crease, the opening of the fold is suppressed and the ruled line at the fold is suppressed. It can be said that cracking is suppressed. Further, from Examples A1, A2, A5, and A6, if the elastic modulus E'is 3.00 ⁇ 10 9 [Mpa] or less and tan ⁇ is 7.00 ⁇ 10 ⁇ 2 or more, the measurement cardboard material is used.
- Comparative Example A7 which has a smaller freeness value than Examples A1 to A6, and Comparative Example A8, which has a larger freeness value than Examples A1 to A6, the smaller the freeness value, the higher the elastic modulus E'. It can be seen that the value of tan ⁇ becomes larger and the value of tan ⁇ becomes larger, and the value of elastic modulus E ′ becomes smaller and larger as the value of freeness becomes larger.
- the elastic modulus E' is 1.00 ⁇ 10 9 [Mpa] or more. It can be said that it is adjusted within the range of 8.00 ⁇ 10 9 [Mpa] or less, tan ⁇ of 2.50 ⁇ 10 -2 or more, and 1.50 ⁇ 10 -1 or less.
- Example A3 in which the ratio of softwood kraft pulp and the basis weight of the liner base paper are different from those in Example A1 and the embodiment in which the basis weight of the liner base paper is different from Example 1 From Example A4, it is presumed that the larger the ratio of softwood kraft pulp and the basis weight of the liner base paper, the larger the value of the elastic coefficient E'and the smaller the value of tan ⁇ .
- the loss modulus E '' from Examples A1 ⁇ A6, and is preferably 1.50 ⁇ 10 8 [Mpa] Exceeded by the range of 2.50 ⁇ 10 8 [Mpa] below Guessed.
- any one of the following product numbers "No. 1" to "No. 25” was used as the liner base paper.
- Each of the liner base papers of product numbers "No. 1" to “No. 25” has the following basis weight and density.
- ⁇ No. 1 Basis weight 120 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇ No. 2, No. 6 to 25: Basis weight 170 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇ No. 3: Basis weight 210 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇ No. 4: Basis weight 280 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇ No. 5: Basis weight 170 [g / m 2 ], density 0.6 [g / cm 3 ]
- the liner base paper of product number "No. 1" is for cardboard composed of three layers by using coniferous kraft pulp and cardboard waste paper pulp with a freeness of 300 [ml] as raw materials and making paper using a multi-layer paper machine. It was prepared as a liner base paper under the following papermaking conditions. Freeness was measured with the following measuring device in accordance with JIS P8121 2012. -Measuring device: Product name "Canadian Standard Freeness", Kumagai Riki Kogyo Co., Ltd., Product number "No. 2580-A"
- Size agent Drug name "Size Pine N-830 (manufactured by Arakawa Chemical Industry Co., Ltd.)"(" ⁇ " in Tables 4 to 7 below) for all pulp in the paper layer It is contained in 0.3 [parts by mass] with respect to the total of 100 [parts by mass]> Paper strength enhancer: The drug name “PT-1001 (manufactured by Arakawa Chemical Industry Co., Ltd.)" is contained in the total of 100 pulps in the paper layer.
- the liner base paper of product number "No. 2" was prepared by the same production method as the liner base paper of "No. 1” except that the basis weight was changed to 170 [g / m 2].
- the liner base paper of product number "No. 3" was prepared by the same production method as the liner base paper of "No. 1” except that the basis weight was changed to 210 [g / m 2].
- the liner base paper of product number "No. 4" was prepared in the same manner as the liner base paper of "No. 1” except that the basis weight was changed to 280 [g / m 2].
- Each of the liner base papers of product numbers "No. 5" to “No. 25” was prepared by the same production method as the liner base paper of "No. 2" except for the following.
- ⁇ No. 5 Density was changed to 0.6 [g / cm 3]
- ⁇ No. 6 The amount of fine fibers was changed to 25 [%] and the average length fiber length was changed to 1.08 [mm].
- 7 The amount of fine fibers was changed to 45 [%] and the average length fiber length was changed to 0.95 [mm].
- 8 The proportion of softwood kraft pulp in the surface pulp was changed to 20 [mass%], and the average length fiber length was changed to 1.50 [mm].
- ⁇ No. 14 The amount of the paper strength enhancer added was changed to 3.0 [parts by mass].
- 15 The amount of fine fibers was changed to 38 [%] and the average length fiber length was changed to 0.98 [mm].
- 16 The ratio of corrugated cardboard pulp contained in the surface pulp was changed to 100 [mass%].
- 17 The amount of fine fibers was changed to 45 [%], the average length fiber length was changed to 0.95 [mm], and the amount of sizing agent added was changed to 5.0 [parts by mass].
- a pyrolysis gas chromatograph mass spectrometer In measuring the concentration of various chemicals such as sizing agent and paper force paper thickener contained in liner base paper, a pyrolysis gas chromatograph mass spectrometer (pyrolysis device: PY-2020D manufactured by Frontier Lab, Gas Chroma) The drug content concentration (weight ratio to pulp) was measured using a Tograph mass spectrometer: 5973N manufactured by Agilent Technologies. Then, the liner base paper to be analyzed is peeled from the core base paper by the following procedures D1 to D2, the liner base paper is dried and then crushed by a crusher, and the crushed products are 200 to 300 [ ⁇ g], 2 The sample was measured through a pyrolysis gas chromatograph mass spectrometer.
- the peak is extracted, the peak area is read, and the read peak area is compared with the above-mentioned calibration curve with reference to the peak of the target drug obtained when the calibration curve is created. Therefore, the drug content concentration of the target drug can be calculated.
- This measurement was performed twice for each sample, and the average value was taken as the drug-containing concentration (pulp-to-pulp weight ratio).
- the various chemicals are filtered (ADVANTEC) so that the content concentrations of the various chemicals are 0.01 [%], 0.1 [%], 1 [%], 5 [%], and 10 [%] in terms of weight ratio.
- the sample was used as a sample for the calibration curve after being soaked in a circular qualitative filter paper, No. 2) and dried. Each calibration curve sample was crushed, and 200 to 300 [ ⁇ g] of the pulverized product was subjected to a pyrolysis gas chromatograph mass spectrometer to prepare the above calibration curve.
- the density was changed by adjusting the nip pressure of the multi-layer paper machine.
- the fine fiber amount and average fiber length are It was adjusted using a fiber classifier (MAX-F700, manufactured by Aikawa Iron Works Co., Ltd.).
- pulp fibers other than fine fibers were removed using a fiber classifier.
- a measurement error of about plus or minus 10% may occur in the measured values of various parameters such as density, average length fiber length, fine fibers, and basis weight, and the number of mass copies of the sizing agent and paper strength enhancer. ..
- Liner fiber information is information measured about pulp fibers constituting the liner base paper, and has three types of "runkel ratio", "length average fiber length", and "fine fiber amount”.
- the average length fiber length is the average value of the lengths (fiber lengths) of the pulp fibers constituting the liner.
- the amount of fine fibers is the ratio [%] of the amount of fine fibers contained to the total amount (100 [%]) of the pulp fibers constituting the liner.
- the fine fiber is a fine fiber having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less.
- Step D1 The second step from the top of the corrugated cardboard material was cut into 40 [cm] squares, and the 40 [cm] square cardboard sheet was used for measurement. The cutting position was in the middle of the cardboard sheet width. Then, the cardboard sheet is immersed in ion-exchanged water for 15 minutes and removed from the ion-exchanged water.
- Step D2 Each of the liner base papers (front liner and back liner) is separated from the core base paper by hand peeling from the cardboard sheet taken out in step D1 so that the liner base paper is not torn.
- Step D3 Each of the liner base paper and the core base paper separated in step D2 was immersed in ion-exchanged water to adjust the concentration to 2%, and then immersed for 24 hours.
- Step D4 After immersing each of the liner base paper and the core base paper whose concentration was adjusted according to step D3 for 24 hours, the pulp was separated into fibers using a standard type disintegrator (manufactured by Kumagai Riki Kogyo Co., Ltd.) for 20 minutes. Disassemble into a shape.
- Step D5 The slurry (pulp fiber) after disintegration is separated in step D4, and the "runkel ratio", "length average fiber length", and “fine fiber amount” are measured using the following fiber length measuring machine. bottom.
- -Fiber length measuring machine Part number FS-5 UHD base unit, manufactured by Valmet
- ⁇ 5 The bottom surface of the evaluation box has not changed at all.
- ⁇ 4 The bottom surface of the evaluation box is not torn, but the bottom surface (liner inside the evaluation box) is dented or broken.
- -3 The bottom surface of the evaluation box is not torn, but the bottom surface (both inner and outer liners of the evaluation box) is dented or broken.
- ⁇ 2 The bottom surface of the evaluation box (the liner inside the evaluation box) is torn.
- ⁇ 1 While the evaluation box is being lifted and held, a large tear occurs in the evaluation box, and the weight falls from the evaluation box. Based on the above criteria, "3" or higher was regarded as a good evaluation, and "2" or less was regarded as a poor evaluation.
- the above-mentioned load test under the temperature / humidity condition A is an evaluation (wet test) of the easiness of tearing of the evaluation box under a high humidity condition.
- each of the measurement cardboard materials of Examples B1 to B19 and Comparative Examples B20 to B29 is susceptible to tearing of the evaluation box in the load test (dry test) under the dry condition of the temperature and humidity condition B below.
- Dry test > Temperature and humidity condition B: Temperature 23 [° C], Humidity 50 [% Rh]
- the dry test is the same as the above procedures E1 to E6 except that the temperature / humidity condition A is changed to the above temperature / humidity condition B in the procedures E3 and E4.
- the amount of the sizing agent added was 0.2 [parts by mass] or more and 4.0 [parts by mass] or less, and the amount of the paper strength enhancer added was 0.1 [parts by mass].
- the above is 4.0 [parts by mass] or less, the average length of pulp fibers is 0.90 [mm] or more and 1.55 [mm] or less, and the amount of fine fibers is 23 [. %] Or more and 48 [%] or less, and the fragility of tearing is evaluated as "3" or more under any of the temperature and humidity conditions A and B, and the evaluation box may be torn or the weight may fall. There wasn't.
- Example 10 having a fiber length of 1.50 [mm] or more and Examples B9 and B19 having a fine fiber amount of 40 [%] or more an evaluation of "4" or more was obtained under the temperature and humidity condition A.
- the amount of the sizing agent added is less than 0.2 [parts by mass] or more than 4.0 [parts by mass], or the amount of the paper strength enhancer added is less than 0.1 [parts by mass] or 4.0 [parts]. More than [parts by mass], the average length of pulp fibers is less than 0.90 [mm] or more than 1.55 [mm], or the amount of fine fibers is less than 23 [%] or 48. In Comparative Examples B20 to B29 larger than [%], an evaluation of "2" or less was obtained at least under the temperature and humidity condition A.
- the amount of the sizing agent added was 0.2 [parts by mass] or more and 4.0 [parts by mass] or less, and the paper strength enhancer was added.
- the amount is 0.1 [parts by mass] or more and 4.0 [parts by mass] or less, and the average fiber length of pulp fibers is 0.90 [mm] or more and 1.55 [mm] or less.
- the amount of fine fibers is 23 [%] or more and 48 [%] or less, it can be said that tearing (breakage) is suppressed in a box manufactured using the measurement cardboard material.
- the amount of the sizing agent added was 0.8 [parts by mass] or more, and the amount of the paper strength enhancer added was 1.0 [parts by mass].
- tearing breakage
- any one of the following product numbers "No. 1" to “No. 15” was used as the liner base paper.
- Each of the liner base papers of product numbers "No. 1" to “No. 15” has the following basis weight and density.
- ⁇ No. 1 Basis weight 120 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇ No. 2, No. 6-11: Basis weight 170 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇
- No. 3 Basis weight 210 [g / m 2 ], density 0.8 [g / cm 3 ] ⁇ No.
- the liner base paper of product number "No. 1" is for cardboard composed of three layers by using coniferous kraft pulp and cardboard waste paper pulp with a freeness of 400 [ml] as raw materials and making paper using a multi-layer paper machine. It was prepared as a liner base paper under the following papermaking conditions. Freeness was measured with the following measuring device in accordance with JIS P8121 2012. -Measuring device: Product name "Canadian Standard Freeness", Kumagai Riki Kogyo Co., Ltd., Product number "No. 2580-A"
- Size agent The drug name "Size Pine N-830 (manufactured by Arakawa Chemical Industry Co., Ltd.)” is 0.3 for a total of 100 [parts by mass] of the total pulp of the paper layer. Contained in [parts by mass]> Paper strength enhancer: The drug name “PT-1001 (manufactured by Arakawa Chemical Industry Co., Ltd.)” is added to 0.5 [parts by mass] for a total of 100 [parts by mass] of all pulp in the paper layer.
- Sulfate band Contained at 5 [parts by mass] with respect to the total 100 [parts by mass] of the total pulp of the paper layer > Coniferous kraft pulp: At a ratio of 10 [mass%] of the pulp fibers in the surface layer Contained. The softwood kraft pulp accounted for 6 [mass%] of the total pulp in the paper layer. > Amount of fine fibers: 36.7 [%] of the pulp fibers forming the liner.
- the surface layer of the three layers of liner base paper was prepared under the above papermaking conditions. Of the three layers of liner base paper, the papermaking conditions for the middle layer and the back layer are not limited to the above papermaking conditions.
- the liner base paper of product number "No. 2" was prepared by the same production method as the liner base paper of "No. 1” except that the basis weight was changed to 170 [g / m 2].
- the liner base paper of product number "No. 3" was prepared by the same production method as the liner base paper of "No. 1” except that the basis weight was changed to 210 [g / m 2].
- the liner base paper of product number "No. 4" was prepared in the same manner as the liner base paper of "No. 1” except that the basis weight was changed to 280 [g / m 2].
- Each of the liner base papers of product numbers "No. 5" to “No. 15" was prepared by the same production method as the liner base paper of "No. 2" except for the following.
- ⁇ No. 5 Density was changed to 0.7 [g / cm 3]
- ⁇ No. 6 The amount of fine fibers was changed to 16.5 [%].
- 7 The amount of fine fibers was changed to 19.8 [%].
- 8 The amount of fine fibers was changed to 26.8 [%].
- 9 The proportion of softwood kraft pulp in the surface pulp was changed to 20 [mass%], and the average length fiber length was changed to 1.50 [mm].
- a pyrolysis gas chromatograph mass spectrometer In measuring the concentration of various chemicals such as sizing agent and paper force paper thickener contained in liner base paper, a pyrolysis gas chromatograph mass spectrometer (pyrolysis device: PY-2020D manufactured by Frontier Lab, Gas Chroma) The drug content concentration (weight ratio to pulp) was measured using a Tograph mass spectrometer: 5973N manufactured by Agilent Technologies. Then, the liner base paper to be analyzed is peeled from the core base paper by the following procedures F1 to F2, the liner base paper is dried and then crushed by a crusher, and the crushed products are 200 to 300 [ ⁇ g], 2 The sample was measured through a pyrolysis gas chromatograph mass spectrometer.
- the peak is extracted, the peak area is read, and the read peak area is compared with the above-mentioned calibration curve with reference to the peak of the target drug obtained when the calibration curve is created. Therefore, the drug content concentration of the target drug can be calculated.
- This measurement was performed twice for each sample, and the average value was taken as the drug-containing concentration (pulp-to-pulp weight ratio).
- the various chemicals are filtered (ADVANTEC) so that the content concentrations of the various chemicals are 0.01 [%], 0.1 [%], 1 [%], 5 [%], and 10 [%] in terms of weight ratio.
- the sample was used as a sample for the calibration curve after being soaked in a circular qualitative filter paper, No. 2) and dried. Each calibration curve sample was crushed, and 200 to 300 [ ⁇ g] of the pulverized product was subjected to a pyrolysis gas chromatograph mass spectrometer to prepare the above calibration curve.
- the densities of the above product numbers "No. 5", “No. 12” to “No. 15” were changed by adjusting the nip pressure of the multi-layer paper machine.
- the amount of fine fibers and the average fiber length are the fiber classifiers (MAX-F700, Aikawa Iron Works Co., Ltd.). Was adjusted using.
- Liner fiber information is information measured about pulp fibers constituting the liner base paper, and has three types of "runkel ratio", "length average fiber length", and "fine fiber amount”.
- the average length fiber length is the average value of the lengths (fiber lengths) of the pulp fibers constituting the liner.
- the amount of fine fibers is the ratio [%] of the amount of fine fibers contained to the total amount (100 [%]) of the pulp fibers constituting the liner.
- the fine fiber is a fine fiber having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less.
- Procedure F1 The second step from the top of the corrugated cardboard material was cut into 40 [cm] squares, and the 40 [cm] square cardboard sheet was used for measurement. The cutting position was in the middle of the cardboard sheet width. Then, the cardboard sheet is immersed in ion-exchanged water for 15 minutes and removed from the ion-exchanged water.
- Step F2 Each of the liner base papers (front liner and back liner) is separated from the core base paper by hand peeling from the cardboard sheet taken out in step F1 so that the liner base paper is not torn.
- Step F3 Each of the liner base paper and the core base paper separated in step F2 was immersed in ion-exchanged water to adjust the concentration to 2%, and then immersed for 24 hours.
- Step F4 After immersing each of the liner base paper and the core base paper whose concentration was adjusted by step F3 for 24 hours, the pulp was separated into fibers using a standard type disintegrator (manufactured by Kumagai Riki Kogyo Co., Ltd.) for 20 minutes. Disassemble into a shape.
- Step F5 The slurry (pulp fiber) after disintegration is separated in step F4, and the "runkel ratio", "length average fiber length", and "fine fiber amount” are measured using the following fiber length measuring machine. bottom.
- -Fiber length measuring machine Part number FS-5 UHD base unit, manufactured by Valmet
- Rule-cutting property is an evaluation standard corresponding to the resistance to tearing at a crease where continuous sheets made of measured corrugated cardboard are folded back.
- Texture is an evaluation standard corresponding to the uniformity of the distribution of pulp fibers constituting the liner forming the corrugated cardboard material. The poorer the texture, the more uneven the fiber distribution, the more likely it is that strength nomura will occur in the liner, and the more likely it will be to cause rule splitting.
- -Procedure G1 Measurement The corrugated cardboard material is allowed to stand on a pallet, wrapped with a stretch film, and then left for 24 [hours] under the following temperature and humidity conditions.> Temperature and humidity conditions: temperature 10 [° C.], humidity 10 [% Rh] ] -Procedure G2: After procedure G1, apply an impact to the measured cardboard material using the following vibrator under the following conditions> Vibration: Product name "Multi-axis vibration test device", Product number "DS-3000-15L", Made by IMV Co., Ltd.> Vibration force: 30 [kN] > Vibration method: Random wave, > Frequency: 100 [Hz] -Procedure G3: Visually check whether or not creases have occurred after the above steps G1 and G2.
- the above rule-cutting property was evaluated according to the following criteria. - ⁇ : No rule break occurs at any crease after the procedure G2. - ⁇ : After step G2, creases occurred at one or more creases. - ⁇ : A rule was formed at one or more creases after the procedure G1. -X: Before the procedure G1, a rule was formed at one or more creases (at the time of folding into a bellows fold). Based on the above criteria, " ⁇ " or higher was regarded as a good evaluation, and " ⁇ " or less was regarded as a bad evaluation.
- the density is 0.60 [g / cm 3 ] or more and 0.85 [g / cm 3 ] or less, and the average length fiber length is 0.98 [mm] or more. It was 1.55 [mm] or less, the amount of fine fibers was 15 [%] or more and 38 [%] or less, and the evaluation of " ⁇ " or more was obtained in both the rule-cutting property and the texture.
- the density is 0.80 [g / cm 3 ] or more
- the average length fiber length is 1.10 [mm] or more
- the amount of fine fibers is 18 [%] or more.
- a rating of " ⁇ " was obtained for the split property.
- the average length fiber length was 0.98 [mm] or more and 1.05 [mm] or less
- an evaluation of “ ⁇ ” was obtained in terms of texture.
- the density is less than 0.60 [g / cm 3 ] or greater than 0.85 [g / cm 3 ], or the average length fiber length is less than 0.98 [mm] or greater than 1.55 [mm].
- the rule-cutting property was evaluated as “ ⁇ ” or less.
- the density was 0.60 [g / cm 3 ] or more and 0.85 [g / cm 3 ] or less, and the average length fiber length was If it is 0.98 [mm] or more and 1.55 [mm] or less, and the amount of fine fibers is 15 [%] or more and 38 [%] or less, at the crease of the measurement cardboard material. It can be said that the rule division is suppressed.
- the density is 0.80 [g / cm 3 ] or more, the average length fiber length is 1.10 [mm] or more, and the fine fiber amount is 18 [%] or more.
- Comparative Examples C17 and C19 since the density is larger than 0.90 [g / cm 3 ], there is no gap between the pulp fibers, stress is hard to escape when the liner is bent, and creases are likely to occur. Guessed. In Comparative Example 19, it is presumed that the liner becomes too hard and the evaluation of the rule-breaking property is inferior because the average fiber length is larger than 1.55 [mm], which is larger than 1.55 [mm]. From Comparative Examples C16 and C18, when the density is less than 0.50 [g / cm 3 ], many gaps are generated between the pulp fibers, the strength of the liner becomes insufficient, and scoring is likely to occur. It is presumed to be.
- the average length fiber length is less than 0.98 [mm] and the amount of fine fibers is larger than 38 [%], so that the average length fiber length is short and the proportion of long fibers is large. It is presumed that the strength of the liner becomes insufficient and the ruled lines are likely to occur because the number of pulp fibers is reduced and the pulp fibers are less entangled with each other. Further, in Comparative Examples C13 to C15, the average length fiber length was less than 0.98 [mm] and the amount of fine fibers was larger than 38 [%], so that the difference between the short fibers and the long fibers was not conspicuous and the texture was good. It is presumed to be.
- Comparative Example C19 the amount of fine fibers is larger than 38 [%], but the average length fiber length is larger than 1.55 [mm], so that the difference between the short fibers and the long fibers is clearly visible, and the texture is formed. Is presumed to be slightly inferior. From Comparative Example C12, when the amount of fine fibers is less than 15 [%], the proportion of pulp fibers (long fibers) having a long fiber length increases, the gaps between the long fibers increase, and creases are likely to occur. It is presumed to be.
- the corrugated cardboard material is not limited to the bellows-folded corrugated cardboard material 1, and may be a single-wafer sheet-shaped corrugated cardboard material.
- a single-sided corrugated cardboard having a liner on one side with respect to the core may be used.
- the device for folding the cardboard into a bellows fold is not particularly limited. The above-mentioned tasks I to IV can occur in a corrugated cardboard material that is bellows-folded using a folding device of any structure.
- the corrugated cardboard material is a material for a box making system
- the crease is a portion where the ruled line is folded back by 180 [°] from the starting point (for example, the ruled line is inside).
- processing such as cuts and perforations may be applied to the creases.
- bellows-folded corrugated cardboard material is not limited to the use as a box-making material applied to a box-making system.
- the bellows-folded corrugated cardboard material which is different from the conventional single-wafered corrugated cardboard sheet, and makes use of the structure in which a plurality of sheets are continuously provided through folds.
- the bellows-folded corrugated cardboard material can be treated as a web-like paper material having a large dimension in the extending direction in the unfolded state of the sheet.
- Use as disaster supplies By attaching it to windows, it can be used as a measure against window cracking during typhoons, as a partition for privacy protection and stress reduction at evacuation centers, as a cushioning material and as a rug for measures against cold. It is available.
- Use at event events It can be used for creations such as signboards for events and school events.
- Use as a building / moving material When it is necessary to temporarily protect a door, wall, door, etc. at a construction site or a moving site, it can be used as a protective material (curing material) that can be attached to an object.
- the dynamic viscoelasticity is defined by the value of the elastic modulus E ′ and tan ⁇ , which is the ratio of the loss elastic modulus E ′′ to the elastic modulus E ′.
- the predetermined range is The elastic modulus E'is 1.00 ⁇ 10 9 [Mpa] or more and 8.00 ⁇ 10 9 [Mpa] or less.
- Appendix 2 The elastic modulus E'is 3.00 ⁇ 10 9 [Mpa] or less, The corrugated cardboard material according to Appendix 1, wherein the tan ⁇ is 7.00 ⁇ 10-2 or more.
- [Appendix 3] The elastic modulus E'is 4.00 ⁇ 10 9 [Mpa] or more, The corrugated cardboard material according to Appendix 1, wherein the tan ⁇ is 4.00 ⁇ 10-2 or less.
- [Appendix 4] The corrugated cardboard material according to any one of Supplementary note 1 to 3, wherein the freeness of the pulp used for the base paper forming the liner is 350 [ml] or more and 500 [ml] or less.
- [Appendix 5] The corrugated cardboard material according to any one of Appendix 1 to 4, wherein a double-sided corrugated cardboard in which the liner is attached to both sides of the core is used as the corrugated cardboard.
- [Appendix 6] The corrugated cardboard material according to any one of Appendix 1 to 5, wherein the corrugated cardboard is a bellows fold in which the corrugated cardboards that are continuous in a strip shape are alternately folded and stacked.
- Appendix 7 It is a corrugated cardboard material that uses corrugated cardboard with a liner attached to the core, and is a bellows-folded corrugated cardboard that is stacked by alternately folding back the corrugated cardboard that is continuous in a strip shape.
- the dynamic viscoelasticity of the measurement piece cut out from the liner measured in the tensile shear mode under the vibration condition of the frequency of 100 [Hz] under the temperature condition of 25 [° C.] is within the predetermined range.
- the dynamic viscoelasticity is defined by the value of the elastic modulus E ′ and tan ⁇ , which is the ratio of the loss elastic modulus E ′′ to the elastic modulus E ′.
- the predetermined range is The elastic modulus E'is 1.00 ⁇ 10 9 [Mpa] or more and 3.00 ⁇ 10 9 [Mpa] or less.
- Appendix 8 The corrugated cardboard material according to Appendix 7, wherein the freeness of the pulp used for the base paper forming the liner is 350 [ml] or more and 500 [ml] or less.
- [Appendix 9] The corrugated cardboard material according to Appendix 7 or 8, wherein a double-sided corrugated cardboard in which the liner is attached to both sides of the core is used as the corrugated cardboard.
- Appendix 10 It is a corrugated cardboard material that uses corrugated cardboard with a liner attached to the core.
- the amount of the sizing agent added to the liner is 0.2 [parts by mass] or more and 4.0 [parts by mass] or less.
- the amount of the paper strength enhancer added to the liner is 0.1 [parts by mass] or more and 4.0 [parts by mass] or less.
- the average length of the pulp fibers constituting the liner is 0.90 [mm] or more and 1.55 [mm] or less.
- the amount of fine fibers having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less is 23 [%] or more and 48 [%].
- % A cardboard material characterized by being less than or equal to.
- Appendix 11 The cardboard material according to claim 10, wherein the amount of the sizing agent added is 0.8 [parts by mass] or more.
- Appendix 12 The cardboard material according to claim 10 or 11, wherein the amount of the paper strength enhancer added is 1.0 [parts by mass] or more.
- Appendix 13 The corrugated cardboard material according to any one of Appendix 10 to 12, wherein the average fiber length is 1.50 [mm] or more.
- [Appendix 14] The corrugated cardboard material according to any one of Supplementary note 10 to 13, wherein the amount of the fine fibers contained is 40 [%] or more.
- Appendix 15 The corrugated cardboard material according to any one of Appendix 10 to 14, wherein a double-sided corrugated cardboard in which the liner is attached to both sides of the core is used as the corrugated cardboard.
- Appendix 16 The corrugated cardboard material according to any one of Appendix 10 to 15, wherein the corrugated cardboard is a bellows fold in which the corrugated cardboards that are continuous in a strip shape are alternately folded and stacked.
- Appendix 17 It is a corrugated cardboard material that uses corrugated cardboard with a liner attached to the core.
- the density of the liner is 0.60 [g / cm 3 ] or more and 0.85 [g / cm 3 ] or less.
- the average length of the pulp fibers constituting the liner is 0.98 [mm] or more and 1.55 [mm] or less.
- the amount of fine fibers having a fiber length of 0.0 [mm] or more and 0.2 [mm] or less is 15 [%] or more and 38 [%].
- %] A cardboard material characterized by being less than or equal to.
- the density is 0.80 [g / cm 3 ] or more, and the density is 0.80 [g / cm 3] or more.
- the average fiber length is 1.10 [mm] or more, and the average fiber length is 1.10 [mm] or more.
- the average fiber length is 0.98 [mm] or more and 1.05 [mm] or less.
- Appendix 20 The corrugated cardboard material according to any one of Appendix 17 to 19, wherein double-sided corrugated cardboard having the liner bonded to both sides of the core is used as the corrugated cardboard.
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Abstract
Description
ダンボール材には連続する矩形状のシート間に折目が設けられ、この折目でシートが交互に折り返されている。このような蛇腹折りのダンボール材では、連続するシートが上下に積み重ねられ、直方体状の荷姿に折り畳まれている。
製造されたダンボール材で荷姿の安定性や定形性を確保するためには、スタッキングパートにおいて、折目を介して連続したシートどうしが隙間を開けずに接した状態で折り合わされていることが望ましい。
・フィード工程:蛇腹折りのダンボール材を繰り出す工程
・ カット工程 :フィード工程で繰り出された平面状のダンボール材を切り出す工程
・フォールド工程:カット工程で切り出されたダンボール材から箱を組み立てる工程
・プリント工程:平面状もしくは組み立てられたダンボール材に印刷を施す工程
・ 荷詰め工程 :組み立てられる箱に内容物を収容する工程
本件は、上記の課題に鑑みて創案されたものであり、折り返し保持性の確保と罫割れの抑制との両立を図ることを目的の一つとする。また、ダンボール材を用いて製造された箱の破れ(破損)を抑制することを目的の一つとする。また、折目の箇所の罫割を抑制することを目的の一つとする。なお、この目的に限らず、後述する「発明を実施するための形態」に示す各構成から導き出される作用および効果であって、従来の技術では得られない作用および効果を奏することも、本件の他の目的として位置付けることができる。
(2)本件によれば、ダンボール材を用いて製造された箱の破損を抑制することができる。
(3)本件によれば、折目の箇所の罫割を抑制することができる。
本実施形態で主に例示するダンボール材は、連続するダンボールにおいて矩形状のシートが折り畳まれた蛇腹折りの製函用資材である。このダンボール材には、中芯に対して両側にライナが設けられた両面ダンボールが用いられる。
・方向 I :水平面に載置されたダンボール材における方向
・方向II:ダンボール材を製造する途中の半製品における方向
そのほか、特に断らない限り、本実施形態の「数値X~数値Y」なる表現は、数値X以上であって数値Y以下の範囲を意味する。
下記の一実施形態では、ダンボール材の構成を項目[1]および[2]で述べる。項目[1]では、ダンボール材が折り畳まれた構造(以下「折畳構造」と称する)を説明する。項目[2]では、ダンボール材に用いられるシート(段ボールシート)の性状に関するパラメータを説明する。
そして、項目[1]および[2]の構成による作用および効果を項目[3]で述べる。
図1に示すように、ダンボール材1は、直方体状をなす製函用資材である。
ダンボール材1では、連続する矩形状のシート2(図1では一部のみに符号を付す)が折目F(図1では一部のみに符号を付す)で折り返され、折り返されたシート2が高さ方向に積み重ねられている。
このように折り畳まれたダンボール材1には、縦方向および高さ方向の双方に沿う一対の側面に、複数の折目Fが縦方向に沿って直線状に延在する。
・第一シート21:第二シート22の一側に連続するシート2
・第二シート22:第一シート21と第三シート23との双方に連続するシート2
・第三シート23:第二シート22の他側に連続するシート2
第一折目F1は、第一シート21に対して横方向の一方(図1では右方)へ向けて第二シート22が折り返される折目Fであり、ダンボール材1における横方向の他方(図1では左方)に配置される。第二折目F2は、第二シート22に対して横方向の他方(図1では左方)へ向けて第三シート23が折り返される折目Fであり、ダンボール材1における横方向の一方(図1では右方)に配置される。
第一シート21および第二シート22からなるシート対20では、第一端縁E1と第二端縁E2とが高さ方向に隣り合って配置される。
なお、ダンボール材1は、汚損や荷崩れを防ぐために、包装用のフィルムで被包(包装)されることが好ましい。
以下、ダンボール材1のパラメータを説明する。
まず、ダンボール材1のサイズや段数などの基本的なパラメータを述べる。その後に、ダンボール材1のシート2に関するパラメータを詳述する。
ダンボール材1のサイズは、下記の寸法L1~L3から定まる。
・ 縦寸法L1 :縦方向の寸法(第一寸法)
・ 横寸法L2 :横方向の寸法(第二寸法)
・高さ寸法L3:高さ方向の寸法(第三寸法)
上記の寸法L1~L3は、小さいほど製造される箱のサイズや形状の制約が大きくなるおそれがあり、大きいほど運搬や納入といった作業性が低下するおそれがある。これらの観点より、寸法L1~L3は、下記の表2に示す範囲であることが好ましい。
たとえば、ダンボール材1の段数としては、たとえば10~1000[段]のさまざまな段数が挙げられる。詳細を後述する折り畳みに関するパラメータが測定される対象のダンボール材については、所定の段数(たとえば100[段])未満の測定対象については、全段のそれぞれにおいてパラメータを測定するのが好ましい。一方、所定の段数(たとえば100[段])以上の測定対象については、部分的(たとえばパートに分けた部分や設定された領域)にパラメータを測定してもよい。
上記の坪量に中芯の段繰率を加味し、縦寸法L1および横寸法L2とシート2の段数N+1とを乗算すれば、ダンボール材1の重量が算出される。
<構成A>
本実施形態のダンボール材1は、ダンボール材1の荷姿を良好にする観点に立脚して、性状に関する構成Aを備えている。具体的には、以下の観点I,IIに立脚して、性状に関する所定の構成Aを備えている。「ダンボール材1の荷姿」とは、直方体状に折り畳まれた蛇腹折りのダンボール材1の外観である。
・観点 I :折目Fでの折り返し保持性を確保すること
・観点 II :折目Fでの罫割れを抑制すること
上記の観点I,IIは、下記の課題I,IIを解決するための観点である。
・課題 I :折目Fでの折り返しが開くこと
・課題 II :折目Fで罫割れが生じること
課題Iでいう「折目Fでの折り返しが開くこと」とは、シート2を折目Fで折り返した際に、折り返した状態が保持されずに折目Fを介して連続するシート2どうしの間に隙間が生じることである。折り返し保持性が不十分であると課題Iが生じる。この課題Iは、折目Fでの折り返し開くことによりダンボール材1の荷姿が乱れる課題とも言える。
上記の観点II,課題IIで「罫割れ」とは、シート2を折目Fで折り返した状態で、折目Fの外側に位置するライナに生じる割れ(破損,破れ)である。
以下、上記の観点I,IIの前提事項として、蛇腹折りのダンボール材1を製造する折り畳み装置の構成と、製造されたダンボール材1の荷姿の良否とを小項目〔i〕,〔ii〕で説明する。その後、小項目〔iii〕で観点I,IIに立脚した所定の構成を説明する。
図2に示す折り畳み装置50は、帯状に連続するダンボールを蛇腹折りに折り畳む装置である。
折り畳み装置50は、特に制限されないが、例えば下記の折り畳み装置を用いることができる。
・折り畳み装置:BHS Corrugated Machinery 社製,
品番「AS-F」
搬送パート50Aは、図示しない上流側のダンボール生産装置(コルゲータ)で製造された帯状のダンボールウェブ1Wをフォールディングパート50B(図2で二点鎖線を参照)へ搬送する搬送路をなす。
複数の折目Fには、上流側のシートが下流側のシートに対して横方向の一方(図2では右方)へ向けて折り返される折目(図1の「第一折目F1」に対応する折目)と、上流側のシートが下流側のシートに対して横方向の他方(図2では左方)へ向けて折り返される折目(図1の「第二折目F2」に対応する折目)とがある。これら第一折目F1と第二折目F2とは搬送方向に沿って交互に並んでいる。
フォールディングパート50Bでは、搬送パート50Aから搬送されたダンボールウェブ1Wが搬送方向へ押し出されつつ下方へ落下する。このとき、第一折目F1では上流側のシートが下流側のシートに対して横方向の一方(図2では右方)へ向けて折り返され、第二折目F2では上流側のシートが下流側のシートに対して横方向の他方(図2では左方)へ向けて折り返される。
荷姿が良好なダンボール材1では、図3Aに示すように、折目Fを介して連続するシートどうしが折目Fで180[°]折り返された後、その折目Fを介して連続するシートどうしが隙間を開けずに接した状態で折り合される。
このように折目Fが閉じた状態で保持されている場合、ダンボール材1の荷姿が良好であるものの、折目Fの罫割れを招くという課題IIが生じるおそれがある。
このように折目Fの閉じた状態が保持されていない場合、折目Fの罫割れは生じにくいものの、折目Fでの折り返しが開くという課題Iが生じるおそれがある。これにより、隙間Sの箇所でシートに折れが生じたり、隙間Sよりも上方でダンボール材1が傾いたりして、ダンボール材1の定形性や安定性が損なわれるおそれもある。延いては蛇腹折りの途中で積み重ねられたシートが崩れてしまい、蛇腹折りのダンボール材1が作成できないおそれがある。
ダンボール材1は、上記の観点I,IIおよび課題I,IIに対応する構成Aとして、下記の構成1Aを備えている。
・構成1A:ダンボール材1を構成するライナの動的粘弾性が所定の範囲内であること
「動的粘弾性」とは、弾性率E′,損失弾性率E′′,tanδとの三種の値で規定されるパラメータであって、ダンボール材1を折り曲げた際の折り曲げた状態の保持性(折目Fの開きにくさ)と折目Fでの罫割れの生じにくさに対応するパラメータである。ダンボール材1を折目Fで折り曲げた際にダンボール材1のライナ原紙をなすパルプ繊維に伸びが生じるが、「動的粘弾性」は、ダンボール材1を折目Fで折り曲げた際にパルプ繊維が伸びた状態の保持性に対応するパラメータとも言える。
損失弾性率E′′は、粘性の強さを表している。
tanδは、下記の式1より弾性率E′に対する損失弾性率E′′の比率である。このtanδは、「1」以下の値であると弾性領域(元の形に戻ろうとする領域)の物性をもつことを意味し、そうでなければ粘性領域(元の形に戻りにくい領域)の物性をもつことを意味する。
tanδ=E′′/E′・・・・式1
tanδの値が大きいほど上記の反発力が小さくなり、tanδの値が小さいほど上記の反発力が大きくなる。
つまり、ダンボール材1には、上述の観点I,IIに立脚して上記の構成1Aが備えられている。
動的粘弾性のうち弾性率E′が所定の範囲を下回っており、tanδが所定の範囲を上回っている場合、ダンボール材1が折目Fで折り曲げられた際、ライナ原紙をなすパルプ繊維が伸びた状態で折目Fに折り曲げによる外力が加わり、課題IIを招きやすくなるものと推察される。
蛇腹折りのダンボール材の製造に適しているという点で、弾性率E′が1.50×109[Mpa]以上であって7.00×109[Mpa]以下であることが好ましく、tanδが3.00×10-2以上であって1.00×10-1以下であることが好ましい。
自動包装システムに用いる資材に適しているという点で、弾性率E′が2.00×109[Mpa]以上であって6.00×109[Mpa]以下であることがより好ましく、tanδが3.50×10-2以上であって9.70×10-2以下であることがより好ましい。
観点IIに立脚すると弾性率E′が4.00×109[Mpa]以上であってtanδが4.00×10-2以下であることが好ましく、弾性率E′が4.50×109[Mpa]以上であってtanδが3.80×10-2以下であることがより好ましい。
また、本実施形態のダンボール材1は、製函資材に用いられた場合に破れにくい箱を製造することができるようにする観点に立脚して、性状に関する構成Bを備えている。具体的には、以下の観点IIIに立脚して、性状に関する所定の構成Bを備えている。
・観点 III :組み立てられた箱の破れ(破損)を抑えること
上記の観点IIIは、下記の課題IIIを解決するための観点である。
・課題 III :組み立てられた箱の破れを招きやすいこと
上記の折目Fの箇所を起点にした破れは、多湿条件下でより発生しやすい傾向がある。そのため、上記の課題Iは、多湿条件下で、蛇腹折りのダンボール材1を用いて組み立てられた箱の破れを招きやすい課題ともいえる。
・構成B1:サイズ剤の添加量が所定の範囲内である
・構成B2:紙力増強剤の添加量が所定の範囲内である
・構成B3:繊維長の長さ平均繊維長が所定の長さ範囲内である
・構成B4:微細繊維量が所定の範囲内である
「紙力増強剤」は、ライナの表面強度向上や印刷時の紙粉発生を防止するために、ダンボール材1をなすライナに添加される薬品である。紙力増強剤の添加量[質量部]は、ライナを構成する全パルプの合計100[質量部]に対して含有される紙力増強剤の添加量[質量部]の割合である。
「微細繊維量」は、ライナを構成するパルプ繊維の合計(100[%])に対して微細繊維が含有される量の割合[%]である。ここで、微細繊維は、繊維長が0.0[mm]以上であって0.2[mm]以下である微細な繊維である。
つまり、ダンボール材1には、上述の観点IIIに立脚して上記の構成B1~B4が備えられている。
サイズ剤の添加量が所定の範囲を上回っている場合、ライナを構成するパルプ繊維間の水素結合をサイズ剤が阻害するため、課題IIIを招くものと推察される。
紙力増強剤の添加量が多いほどライナの強度が増加する傾向にあるが、紙力増強剤の添加量が所定の範囲を上回っている場合、紙力増強剤が凝集して強度が低下するため、課題IIIを招くものと推察される。
微細繊維量が所定の範囲を上回っていると、長繊維の割合が減ってパルプ繊維どうしの絡まりが少なくなり、課題IIIを招くものと推察される。
紙力増幅剤の添加量は、0.1[質量部]以上であって4.0[質量部]以下であり、好ましくは0.5[質量部]以上であって3.5[質量部]以下であり、より好ましくは1.0[質量部]以上であって3.0[質量部]以下である。
微細繊維量は、23[%]以上であって48[%]以下であり、好ましくは30[%]以上であって47[%]以下であり、より好ましくは40[%]以上であって46[%]以下である。
本実施形態のダンボール材1は、折目Fの箇所に破れ(罫割)が生じにくいようにする観点に立脚して、性状に関する構成Cを備えている。具体的には、以下の観点IVに立脚して、性状に関する所定の構成Cを備えている。
・観点 IV :折目Fの箇所で罫割を抑えること
上記の観点IVは、下記の課題IVを解決するための観点である。
・課題 IV :折目Fの箇所で罫割を招きやすいこと
蛇腹折りのダンボール材1で折目Fは連続するシートを180[°]折り返す箇所である。蛇腹折りのダンボール材1では、この折目Fの箇所に罫割が発生しやすい傾向がある。そのため、上記の課題IVは、蛇腹折りのダンボール材1で折目Fの箇所に罫割を招きやすい課題といえる。
ダンボール材1は、上記の観点IVおよび課題IVに対応する構成Cとして、下記の構成C1~C3を備えている。
・構成C1:ライナの密度が所定の範囲内である
・構成C2:繊維長の長さ平均繊維長が所定の長さ範囲内である
・構成C3:微細繊維量が所定の範囲内である
「長さ平均繊維長」は、ライナを構成するパルプ繊維の長さ(繊維長)の平均である。この長さ平均繊維長は、下記の微細繊維を含むパルプ繊維の長さの平均である。
「微細繊維量」は、ライナを構成するパルプ繊維の合計(100[%])に対して微細繊維が含有される量の割合[%]である。ここで、微細繊維は、繊維長が0.0[mm]以上であって0.2[mm]以下である微細な繊維である。
つまり、ダンボール材1には、上述の観点IVに立脚して上記の構成C1~C3が備えられている。
密度が所定の範囲を上回っている場合、パルプ繊維間の隙間がなくなってライナを折り曲げたときに応力が逃げ難くなり、課題IVを招くものと推察される。
長さ平均繊維長が短いほどライナの強度が低減する傾向にあり、長さ平均繊維長が所定の長さ範囲を下回っていると、ライナの強度が不十分になり、課題IVを招くものと推察される。
微細繊維量が所定の範囲を下回っていると、繊維長の長いパルプ繊維(長繊維)の割合が増して長繊維間の隙間が多くなり、課題IVを招くものと推察される。
微細繊維量が所定の範囲を上回っていると、長繊維の割合が減ってパルプ繊維どうしの絡まりが少なくなってライナの強度が不十分になり、課題IVを招くものと推察される。
長さ平均繊維長は、0.98[mm]以上であって1.55[mm]以下であり、好ましくは1.00[mm]以上であって1.53[mm]以下であり、より好ましくは1.10[mm]以上であって1.52[mm]以下である。
微細繊維量は、15[%]以上であって38[%]以下であり、好ましくは17[%]以上であって37[%]以下であり、より好ましくは18[%]以上であって36[%]以下である。
(1)本実施形態のダンボール材1は、上述の構成Aを備えることにより、ダンボール材1を折目Fで折り返した際に折目Fでの折り返しが開かず、また、折目Fで罫割れが生じにくいため、折り返し保持性の確保と罫割れの抑制との両立を図ることができる。そのため、例えば蛇腹折りのダンボール材1で荷姿の定形性や安定性が確保される。
以下、実施例および比較例を挙げて本発明の構成A,BおよびCを具体的に説明する。ただし、本発明は、下記の実施例に限定されるものではない。
実施例および比較例において、パラメータの測定される対象となるダンボール材(以下「測定ダンボール材」と称する)は、両面ダンボールのシートである。
この測定ダンボール材は、下記のサイズである。
・ サ イ ズ :縦寸法1300[mm],
横寸法1150[mm],
高さ寸法1800[mm]
まず、構成Aに関する実施例を述べる。
実施例A1~A6および比較例A7,A8では、以下に示す三種のフルートのうち何れか一つのフルートを採用した。
・ A フルート
・ B フルート
・ E フルート
・No.1:坪量120[g/m2],フリーネス400[ml]
・No.2:坪量160[g/m2],フリーネス400[ml]
・No.3:坪量170[g/m2],フリーネス400[ml]
・No.4:坪量210[g/m2],フリーネス400[ml]
・No.5:坪量120[g/m2],フリーネス300[ml]
・No.6:坪量120[g/m2],フリーネス600[ml]
品番「No.3」のライナ原紙は、表層のパルプのうち針葉樹クラフトパルプが含有される割合を50[質量%]に変更し、坪量を170[g/m2]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
品番「No.4」のライナ原紙は、坪量を210[g/m2]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
品番「No.6」のライナ原紙は、針葉樹クラフトパルプおよびダンボール古紙パルプのフリーネスを600[ml]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
パルプの叩解とは、パルプ繊維を叩き、磨砕(摩砕)する機械的処理であり、周知のリファイナー(機械的処理設備)を用いて実施される。フリーネスの値はリファイナーの設定により調節され得る。
パルプを叩解する工程(叩解工程)は、原紙の製造工程における抄紙工程の直前に実施される。この叩解工程では、抄紙に用いられるパルプの叩解のほか、パルプに薬品を配合する処理などが施される。
・No.7:坪量120[g/m2]〔OND-EM120:王子マテリア株式会社製〕
・No.8:坪量160[g/m2]〔OND-EM160:王子マテリア株式会社製〕
実施例A1~A6および比較例A7,A8の測定ダンボール材のそれぞれは、表3に示す総厚[mm]を有する両面ダンボールである。
実施例A1~A6および比較例A7,A8のそれぞれでは、ライナ原紙のフリーネスを調節することで、弾性率E′の値を変化させており、その結果tanδの値が調節されている。
手順A2:手順A1で採取した測定用シートを、水道水に15[分]間浸漬する。
手順A3:手順A2で浸漬された測定用シートを水道水から取り出して、取り出した測定用シートのライナ原紙(表ライナおよび裏ライナ)のそれぞれを、ライナ原紙が破れないよう、手で剥がすことで中芯原紙から分離する。
手順A4:手順A3で分離したライナ原紙を105[°]の乾燥機で20[分]間乾燥する。
手順A5:手順A4で乾燥されたライナ原紙から下記の寸法の測定用サンプル片を切り出す。
>寸法
・縦方向:5[mm]
・横方向:30[mm]
>機器
動的粘弾性測定装置
株式会社ユービーエム製,型番Rheogel-E4000
>条件
・測定手法:引張剪断モード
・ 周波数 :100 [Hz](振動条件)
・ 歪 み :0.10[%]
・ 温 度 :25 [℃](温度条件)
上記のようにして動的粘弾性が測定された実施例A1~A6および比較例A7,A8について、つぎに説明するスタッキング性と罫割性とを評価した。
「スタッキング性」は、測定ダンボール材が蛇腹折りに折り畳まれた(スタッキングされた)際の荷姿の良否に対応する評価基準であり、シートを折目で折り返した状態の保持する性能(折り返し保持性)とも言える。
「罫割性」は、測定ダンボール材を折目で折り返した状態で、折目の箇所における破損(罫割れ)のしにくさに対応する評価基準である。破損は折目の箇所でのライナ原紙の割れ,裂け,破れなどを含む。折目の箇所とは折目の周辺を含む領域である。
製造工程は下記の手順B1~B4を備える。この製造工程で両面ダンボールウェブの製造には、シングルフェーサとダブルフェーサとを備える周知のコルゲータが用いられる。
・手順B2:手順B1で接着剤を塗布した中芯原紙に対して裏ライナ用原紙ロールから供給された裏ライナ用のライナ原紙を貼合し、これをロールで加圧および加熱して接着し、片面ダンボールウェブを形成する(シングルフェーサでの処理)。
・手順B3:手順B2で形成した片面ダンボールウェブの中芯側に、表ライナ用原紙ロールから供給された表ライナ用のライナ原紙を接着剤で貼合し、これを加圧および加熱ロールで加圧および加熱して接着し、両面ダンボールウェブを作成する(ダブルフェーサでの処理)。
・手順B4:手順B3で作成した両面ダンボールウェブに対して、延在方向に一定間隔で離間して幅方向に延びる折目を形成する。
>手順B2(シングルフェーサ)
・加熱温度120~200[℃]
・ロール線圧20~40[kN/m]
・加圧時間0.01~0.20[秒]、
>手順 B3 (ダブルフェーサ)
・加熱温度120~200[℃]
・ロール線圧0.1~1.0[kN/m]
・加圧時間2~7[秒]
なお、ライナ原紙と中芯原紙とを貼合には、合成樹脂などのエマルジョンが使用されてもよい。合成樹脂の具体例としては、ポリエチレン,ポリプロピレン,ポリアミド,ポリエステル,エチレン-不飽和カルボン酸共重合体,スチレン-ブタジエン共重合体,ブタジエン-アクリロニトリル共重合体,スチレン-ブタジエン-アクリロニトリル共重合体,ポリ酢酸ビニル,エチレン-酢酸ビニル共重合体,ポリアクリル酸エステル系共重合体,スチレン-アクリル酸エステル共重合体などが挙げられる。
・折り畳み装置:BHS Corrugated Machinery 社製
品番「AS-F」,
・ 搬 送 速 度:100[m/min]
・手順C1:手順B4の後、作成された両面ダンボールウェブを上記の折り畳み装置へ搬送する(図2の搬送パート50Aを参照)。
・手順C2:手順C1で搬送された両面ダンボールウェブを折目で交互に折り返して、蛇腹折りに折り畳み、上述した荷姿寸法の蛇腹折りの測定ダンボール材を作成する(図2のフォールディングパート50B,スタッキングパート50Cを参照)。
・○:測定ダンボール材が作成可能であり、何れの折目にも隙間〔図3Bの符号Sを参照〕が生じていない。
・△:測定ダンボール材が作成可能であるが、一[個]以上の折目に隙間〔図3Bの符号Sを参照〕が生じた。
・×:測定ダンボール材が作成できなかった。
スタッキング性の評価では「△」以上を良好な評価とした。
・○:全ての折目に罫割がみられなかった。
・△:一[個]以上の折目で幅方向の一部分に罫割れが一[個]以上みられた。
・×:一[個]以上の折目で幅方向の全幅にわたり罫割れが一[個]以上みられた。
罫割性の評価では「△」以上を良好な評価とした。
特に、弾性率E′が3.00×109[Mpa]以下であってtanδが7.00×10-2以上である実施例A1,A2,A5,A6では、罫割性について「△」の評価だったが、スタッキング性について「〇」の評価が得られた。
また、弾性率E′が4.00×109[Mpa]以上であってtanδが4.00×10-2以下である実施例A3,A4ではスタッキング性について「△」の評価だったが、罫割性について「〇」の評価が得られた。
弾性率E′が8.00×109[Mpa]より大きくtanδが2.50×10-2未満である比較例A7では、罫割性について「〇」の評価が得られたがスタッキング性について「×」の評価が得られた。また、弾性率E′が1.00×109[Mpa]未満でtanδが1.50×10-1より大きい比較例A8では、スタッキング性について「〇」の評価が得られたが罫割性について「×」の評価が得られた。
さらに、実施例A1,A2,A5,A6からは、弾性率E′が3.00×109[Mpa]以下であってtanδが7.00×10-2以上であれば、測定ダンボール材を折目で折り返した際に折目での折り返しが開くことを防止できると言える。実施例A3,A4からは、弾性率E′が4.00×109[Mpa]以上であってtanδが4.00×10-2以下であれば、測定ダンボール材を折目で折り返した際に折目での罫割れを防止できると言える。
比較例A8からは、弾性率E′が1.00×109[Mpa]未満でtanδが1.50×10-1より大きいことにより、ライナ原紙をなすパルプ繊維が伸びた状態で折目Fに折り曲げによる外力が加わり、罫割性が不良になるものと推測される。
比較例A7,A8に鑑みて実施例A1~A6からはフリーネスの値が350[ml]以上であり500[ml]以下であれば、弾性率E′が1.00×109[Mpa]以上であって8.00×109[Mpa]以下であり、tanδが2.50×10-2以上であって1.50×10-1以下の範囲内に調節されると言える。
なお、損失弾性率E′′については、実施例A1~A6から、1.50×108[Mpa]以上であって2.50×108[Mpa]以下の範囲内であることが好ましいと推測される。
次に、構成Bに関する実施例を述べる。
・ A フルート(シングルフルート),総厚:5.0[mm]
・ E フルート(シングルフルート),総厚:1.5[mm]
・ AB フルート(ダブルルフルート),総厚:8.5[mm]
・No.1:坪量120[g/m2],密度0.8[g/cm3]
・No.2,No.6~25:坪量170[g/m2],密度0.8[g/cm3]
・No.3:坪量210[g/m2],密度0.8[g/cm3]
・No.4:坪量280[g/m2],密度0.8[g/cm3]
・No.5:坪量170[g/m2],密度0.6[g/cm3]
・測定装置:製品名「カナディアンスタンダードフリーネス」,熊谷理機工業株式会社,製品番号「No.2580‐A」
>サイズ剤:薬剤名「サイズパイン N-830(荒川化学工業株式会社製)」(下記の表4~表7で「α」)を紙層の全パルプの合計100[質量部]に対して0.3[質量部]で含有する
>紙力増強剤:薬剤名「PT-1001(荒川化学工業株式会社製)」を紙層の全パルプの合計100[質量部]に対して0.2[質量部]で含有する
>硫酸バンド:紙層の全パルプの合計100[質量部]に対して5[質量部]で含有する
>針葉樹クラフトパルプ:表層のパルプ繊維のうち10[質量%]の割合で含有した。また、針葉樹クラフトパルプは紙層の全パルプのうち6[質量%]であった。
>微細繊維量:ライナをなすパルプ繊維のうち33[%]であった。
上記の抄紙条件でライナ原紙の三層のうち表層を作成した。ライナ原紙の三層のうち中層と裏層との抄紙条件は上記の抄紙条件に限定されない。
品番「No.3」のライナ原紙は、坪量を210[g/m2]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
品番「No.4」のライナ原紙は、坪量を280[g/m2]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
・No.5:密度を0.6[g/cm3]に変更した
・No.6:微細繊維量を25[%]に変更して長さ平均繊維長を1.08[mm]に変更した
・No.7:微細繊維量を45[%]に変更して長さ平均繊維長を0.95[mm]に変更した
・No.8:表層のパルプのうち針葉樹クラフトパルプの含有される割合を20[質量%]に変更し、長さ平均繊維長を1.50[mm]に変更した
・No.10:サイズ剤の添加量を5[質量部]に変更した
・No.11:サイズ剤を薬剤名「サイズパイン NT-78(荒川化学工業株式会社製)」(下記の表4~表7で「β」)に変更した
・No.12:サイズ剤を薬剤名「サイズパイン K-287(荒川化学工業株式会社製)」(下記の表4~表7で「γ」)に変更した
・No.13:紙力増強剤の添加量を1.5[質量部]に変更した
・No.15:微細繊維量を38[%]に変更して長さ平均繊維長を0.98[mm]に変更した
・No.16:表層のパルプのうちダンボール古紙パルプの含有される割合を100[質量%]に変更した
・No.17:微細繊維量を45[%]に変更して長さ平均繊維長を0.95[mm]に変更し、サイズ剤の添加量を5.0[質量部]に変更した
・No.19:微細繊維量を50[%]に変更して長さ平均繊維長を0.94[mm]に変更した
・No.20:表層のパルプのうち針葉樹クラフトパルプの含有される割合を20[質量%]に変更し、長さ平均繊維長を1.60[mm]に変更した
・No.21:サイズ剤を添加しなかった
・No.23:紙力増強剤を添加しなかった
・No.24:紙力増強剤の添加量を5.0[質量部]に変更した
・No.25:表層のパルプのうち針葉樹クラフトパルプの含有される割合を20[質量%]に変更し、サイズ剤の添加量を8.0[質量部]に変更し、微細繊維量を50[%]に変更して長さ平均繊維長を1.60[mm]に変更した
その上で、分析対象の上記ライナ原紙を下記手順D1~D2により、中芯原紙から剥離し、ライナ原紙を乾燥後、粉砕機にて粉砕し、それら粉砕物を200~300[μg]、2サンプルを熱分解ガスクロマトグラフ質量分析装置にかけて測定した。
この測定は、各サンプルについて2回ずつ行って、その平均値を薬剤含有濃度(対パルプ重量比)とした。
なお、各種薬剤の含有濃度が重量比で0.01[%],0.1[%],1[%],5[%],10[%]となるように、各種薬剤をろ紙(ADVANTEC製、円形定性ろ紙、No.2)に染込ませ、乾燥させたものを検量線用サンプルとした。各検量線用サンプルを粉砕し、それら粉砕物を200~300[μg]を熱分解ガスクロマトグラフ質量分析装置にかけることで上記の検量線を作成した。
上記の品番「No.6」~「No.8」,「No.15」,「No.17」~「No.20」,「No.25」で微細繊維量や長さ平均繊維長は、繊維分級機(MAX-F700,相川鉄工株式会社製)を用いて調節された。品番「No.7」,「No.17」では繊維分級機を用いて微細繊維以外のパルプ繊維を取り除いた。
・No.26:坪量120[g/m2],密度0.65[g/cm3]〔OND-EM120:王子マテリア株式会社製〕
・No.27:坪量160[g/m2],密度0.65[g/cm3]〔OND-EM160:王子マテリア株式会社製〕
上記の実施例B1~B19および比較例B20~B29のそれぞれについて、表4~表7に示すライナ繊維情報が測定された。なお、密度や、長さ平均繊維長,微細繊維,坪量など各種パラメータの測定値や、サイズ剤,紙力増強剤の質量部数には、測定誤差がプラスマイナス10%程度生じる可能性がある。
ルンケル比は、パルプ繊維の形状を示すパラメータであり、(ルンケル比)=(繊維壁厚の2倍)/(繊維内腔径)で算出される。ルンケル比が大きいほど剛直な繊維であることを示している。
長さ平均繊維長は、ライナを構成するパルプ繊維の長さ(繊維長)の平均値である。
微細繊維量は、ライナを構成するパルプ繊維の合計(100[%])に対して微細繊維が含有される量の割合[%]である。微細繊維は、繊維長が0.0[mm]以上であって0.2[mm]以下である微細な繊維である。
手順D1:ダンボール材の最上段から2段目を40[cm]角に切り出し、その40[cm]角ダンボールシートを測定に供試した。切り出し位置はダンボールシート幅の真ん中とした。それから、ダンボールシートをイオン交換水に15分間浸漬し、イオン交換水から取り出す。
手順D2:手順D1で取り出したダンボールシートからライナ原紙(表ライナおよび裏ライナ)のそれぞれを、ライナ原紙が破れないよう、手で剥がすことで中芯原紙から分離する。
手順D3:手順D2で分離したライナ原紙と中芯原紙とのそれぞれを、イオン交換水に浸し、濃度2%に調整した上で、24時間浸した。
手順D4:手順D3により濃度を調整したライナ原紙と中芯原紙とのそれぞれを24時間浸した後、標準型離解機(熊谷理機工業社製)を用いて20分間離解して、パルプを繊維状に分解する。
手順D5:手順D4で離解後のスラリー(パルプ繊維)を分取し、下記の繊維長測定機を使用して、「ルンケル比」,「長さ平均繊維長」,「微細繊維量」を測定した。
・繊維長測定機:品番FS-5 UHDベースユニット,バルメット社製
上記のようにして「ルンケル比」,「長さ平均繊維長」,「微細繊維量」が測定された実施例B1~B19および比較例B20~B29について、評価箱の破れやすさを評価した。
「破れやすさ」とは、箱に収容される内容物に対する耐荷重の軽重に対応する評価基準である。この破れやすさは、下記の手順E1~E6に従う荷重試験で評価した。
・手順E1:測定ダンボール材から下記の形状・サイズにサンプルカッター(株式会社ミマキエンジニアリング社製,CF2-1218)で評価箱の展開パターンを切り抜く。
>形 状:A式段ボール箱が展開されたパターン
>サイズ:A式段ボール箱の側板の幅寸法356[mm],
A式段ボール箱の端板の幅寸法159[mm],
A式段ボール箱の高さ寸法256[mm]
・手順E2:手順E1で切り抜いた展開パターンで評価箱の底面をなす領域に下記の罫線治具で下記の深さの罫線(折目)を手動でつけて、手組みで評価箱を組み立てる。
>罫線治具:R罫(罫線幅2[mm],日本ダイスチール株式会社製)
>罫線深さ:測定ダンボール材の総厚の50[%]凹ませる
・手順E3:手順E2で組み立てた評価箱を下記の温湿度条件Aで1[時間]処理する。
>温湿度条件A:温度30[℃],湿度90[%Rh]
・手順E4:手順E3で処理した後、上記の温湿度条件Aで評価箱に重さ15[kg]のオモリを収容する。なお、オモリは評価箱の底面全体に荷重がかかるように配置される。
・手順E5:手順E4の後、二人の作業員が評価箱を持ち上げて、30[秒]間保持する。
・手順E6:手順E5にて評価箱に破れが発生したか否かを目視で確認する。
・5:評価箱の底面が全く変化していない。
・4:評価箱の底面に破れは生じないが、底面(評価箱の内側のライナ)に凹みや折れが生じる。
・3:評価箱の底面に破れは生じないが、底面(評価箱の内側および外側の両ライナ)に凹みや折れが生じる。
・2:評価箱の底面(評価箱の内側のライナ)に破れが生じる。
・1:評価箱を持ち上げて保持している最中に評価箱に大きな破れが生じ、オモリが評価箱から落下する。
上記の基準で「3」以上を良好な評価とし、「2」以下を不良な評価とした。
実施例B1~B19および比較例B20~B29の測定ダンボール材のそれぞれは、ウェット試験に加えて、下記の温湿度条件Bの乾燥条件下の荷重試験(ドライ試験)でも評価箱の破れやすさが評価される。
>温湿度条件B:温度23[℃],湿度50[%Rh]
ドライ試験は、手順E3,E4で温湿度条件Aを上記の温湿度条件Bに変更したことを除き、上記手順E1~E6と同様である。
さらに、実施例B9,B10,B11,B12,B15,B16、B19からは、サイズ剤の添加量が0.8[質量部]以上,紙力増強剤の添加量が1.0[質量部]以上,長さ平均繊維長が1.50[mm]以上,および、微細繊維量が40[%]以上の何れか一つを備えると、多湿条件下で破れ(破損)を防止できると言える。
比較例B28からは、紙力増強剤の添加量が4.0[質量部]より大きいことにより、紙力増強剤が凝集してしまいライナの強度が低下し、破れやすくなるものと推測される。
比較例B24,B29からは、長さ平均繊維長が1.55[mm]より大きいことにより、長繊維間の隙間が多く吸水しやすくなり、多湿条件下でライナの強度が低下して、破れやすくなるものと推測される。
比較例B20からは、微細繊維量が23[%]未満であることにより、長繊維間の隙間が多く吸水しやすくなり、多湿条件下でライナの強度が低下して、破れやすくなるものと推測される。
比較例B21~B23,B29からは、微細繊維量が48[%]よりも大きいことにより、長繊維が少なくなりパルプ繊維どうしの絡まりが少なく、ライナの強度が低下して、破れやすくなるものと推測される。
次に、構成Cに関する実施例を述べる。
構成Cに関する実施例で測定ダンボール材は、作業者が手作業で、帯状に延在するダンボールウェブを上記のサイズとなるように蛇腹折りに折り畳んで作成された。
・ A フルート(シングルフルート),総厚:5.0[mm]
・ E フルート(シングルフルート),総厚:1.5[mm]
・ AB フルート(ダブルルフルート),総厚:8.2[mm]
・No.1:坪量120[g/m2],密度0.8[g/cm3]
・No.2,No.6~11:坪量170[g/m2],密度0.8[g/cm3]
・No.3:坪量210[g/m2],密度0.8[g/cm3]
・No.4:坪量280[g/m2],密度0.8[g/cm3]
・No.5:坪量170[g/m2],密度0.7[g/cm3]
・No.12,14:坪量170[g/m2],密度0.5[g/cm3]
・No.13,15:坪量170[g/m2],密度0.9[g/cm3]
・測定装置:製品名「カナディアンスタンダードフリーネス」,熊谷理機工業株式会社,製品番号「No.2580‐A」
>サイズ剤:薬剤名「サイズパイン N-830(荒川化学工業株式会社製)」を紙層の全パルプの合計100[質量部]に対して0.3[質量部]で含有する
>紙力増強剤:薬剤名「PT-1001(荒川化学工業株式会社製)」を紙層の全パルプの合計100[質量部]に対して0.5[質量部]で含有する
>硫酸バンド:紙層の全パルプの合計100[質量部]に対して5[質量部]で含有する
>針葉樹クラフトパルプ:表層のパルプ繊維のうち10[質量%]の割合で含有した。また、針葉樹クラフトパルプは紙層の全パルプのうち6[質量%]であった。
>微細繊維量:ライナをなすパルプ繊維のうち36.7[%]であった。
上記の抄紙条件でライナ原紙の三層のうち表層を作成した。ライナ原紙の三層のうち中層と裏層との抄紙条件は上記の抄紙条件に限定されない。
品番「No.3」のライナ原紙は、坪量を210[g/m2]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
品番「No.4」のライナ原紙は、坪量を280[g/m2]に変更した以外は、「No.1」のライナ原紙と同様の作成方法で作成された。
・No.5:密度を0.7[g/cm3]に変更した
・No.6:微細繊維量を16.5[%]に変更した
・No.7:微細繊維量を19.8[%]に変更した
・No.8:微細繊維量を26.8[%]に変更した
・No.9:表層のパルプのうち針葉樹クラフトパルプの含有される割合を20[質量%]に変更し、長さ平均繊維長を1.50[mm]に変更した
・No.11:微細繊維量を40.1[%]に変更した
・No.12:密度を0.5[g/cm3]に変更した
・No.13:密度を0.9[g/cm3]に変更した
・No.14:微細繊維量を13.9[%]に変更し、密度を0.5[g/cm3]に変更した
・No.15:表層のパルプのうち針葉樹クラフトパルプの含有される割合を20[質量%]に変更して、微細繊維量を40.1[%]に変更し、密度を0.9[g/cm3]に変更した
その上で、分析対象の上記ライナ原紙を下記手順F1~F2により、中芯原紙から剥離し、ライナ原紙を乾燥後、粉砕機にて粉砕し、それら粉砕物を200~300[μg]、2サンプルを熱分解ガスクロマトグラフ質量分析装置にかけて測定した。
この測定は、各サンプルについて2回ずつ行って、その平均値を薬剤含有濃度(対パルプ重量比)とした。
なお、各種薬剤の含有濃度が重量比で0.01[%],0.1[%],1[%],5[%],10[%]となるように、各種薬剤をろ紙(ADVANTEC製、円形定性ろ紙、No.2)に染込ませ、乾燥させたものを検量線用サンプルとした。各検量線用サンプルを粉砕し、それら粉砕物を200~300[μg]を熱分解ガスクロマトグラフ質量分析装置にかけることで上記の検量線を作成した。
上記の品番「No.6」~「No.11」,「No.14」,「No.15」で微細繊維量や長さ平均繊維長は、繊維分級機(MAX-F700,相川鉄工株式会社製)を用いて調節された。
・No.16:坪量120[g/m2],密度0.65[g/cm3]〔OND-EM120:王子マテリア株式会社製〕
・No.17:坪量160[g/m2],密度0.65[g/cm3]〔OND-EM160:王子マテリア株式会社製〕
上記の実施例C1~C11および比較例C12~C19のそれぞれについて、表8~表10に示すライナ繊維情報が測定された。なお、密度や、長さ平均繊維長,微細繊維,坪量など各種パラメータの測定値には、測定誤差がプラスマイナス10%程度生じる可能性がある。
ルンケル比は、パルプ繊維の形状を示すパラメータであり、(ルンケル比)=(繊維壁厚の2倍)/(繊維内腔径)で算出される。ルンケル比が大きいほど剛直な繊維であることを示している。
長さ平均繊維長は、ライナを構成するパルプ繊維の長さ(繊維長)の平均値である。
微細繊維量は、ライナを構成するパルプ繊維の合計(100[%])に対して微細繊維が含有される量の割合[%]である。微細繊維は、繊維長が0.0[mm]以上であって0.2[mm]以下である微細な繊維である。
手順F1:ダンボール材の最上段から2段目を40[cm]角に切り出し、その40[cm]角ダンボールシートを測定に供試した。切り出し位置はダンボールシート幅の真ん中とした。それから、ダンボールシートをイオン交換水に15分間浸漬し、イオン交換水から取り出す。
手順F2:手順F1で取り出したダンボールシートからライナ原紙(表ライナおよび裏ライナ)のそれぞれを、ライナ原紙が破れないよう、手で剥がすことで中芯原紙から分離する。
手順F3:手順F2で分離したライナ原紙と中芯原紙とのそれぞれを、イオン交換水に浸し、濃度2%に調整した上で、24時間浸した。
手順F4:手順F3により濃度を調整したライナ原紙と中芯原紙とのそれぞれを24時間浸した後、標準型離解機(熊谷理機工業社製)を用いて20分間離解して、パルプを繊維状に分解する。
手順F5:手順F4で離解後のスラリー(パルプ繊維)を分取し、下記の繊維長測定機を使用して、「ルンケル比」,「長さ平均繊維長」,「微細繊維量」を測定した。
・繊維長測定機:品番FS-5 UHDベースユニット,バルメット社製
上記のようにして「ルンケル比」,「長さ平均繊維長」,「微細繊維量」が測定された実施例C1~C11および比較例C12~C19について、罫割性と地合いを評価した。
「罫割性」とは、測定ダンボール材で連続するシートどうしを折り返した折目の箇所での破れにくさに対応する評価基準である。
「地合い」とは、測定ダンボール材をなすライナを構成するパルプ繊維の分布の均一性に対応する評価基準である。地合いが悪いほど、繊維分布が不均一となりライナに強度ノムラが生じやすくなり罫割を招きやすい傾向がある。
・手順G1:測定ダンボール材をパレットに静置して、ストレッチフィルムで包装した後、下記の温湿度条件で24[時間]放置する
>温湿度条件:温度10[℃],湿度10[%Rh]
・手順G2:手順G1の後、下記の振動機を用いて下記の条件で測定ダンボール材に衝撃を加える
>振動機:製品名「多軸振動試験装置」,品番「DS-3000-15L」,IMV株式会社製
>加 振 力:30[kN]
>加振方法:ランダム波、
>周 波 数:100[Hz]
・手順G3:上記の手順G1,G2の後に折目に罫割が発生したか否かを目視で確認する。
・◎:手順G2の後に何れの折目にも罫割が全く生じない。
・〇:手順G2の後に一[箇所]以上の折目で罫割が生じた。
・△:手順G1の後に一[箇所]以上の折目で罫割が生じた。
・×:手順G1の前に(蛇腹折りに折り畳む時点で)一[箇所]以上の折目で罫割が生じた。
上記の基準で「〇」以上を良好な評価とし、「△」以下を不良な評価とした。
地合いは、下記の基準で評価した。
・◎:パルプ繊維のムラがない。
・〇:パルプ繊維にムラが生じている(雲状地合)。
・×:パルプ繊維の凝集物が観察された。
上記の基準で「〇」以上を良好な評価とし、「×」以下を不良な評価とした。
長さ平均繊維長が0.98[mm]以上であって1.05[mm]以下である実施例C1~C7では、地合いで「◎」の評価が得られた。
実施例C9~C11からは、密度が0.80[g/cm3]以上であり、長さ平均繊維長が1.10[mm]以上であり、微細繊維量が18[%]以上の何れか一つを備えると、折目の箇所で罫割を防止できると言える。
実施例C1~C7からは、長さ平均繊維長が0.99[mm]以上であって1.00[mm]以下であると地合いが良好になると言える。
比較例C16,C18からは、密度が0.50[g/cm3]未満であることにより、パルプ繊維間の隙間が多く発生してライナの強度が不十分になり、罫割が生じやすくなるものと推測される。
また、比較例C13~C15では長さ平均繊維長が0.98[mm]未満で微細繊維量が38[%]よりも大きいことにより短繊維と長繊維の差が目立たず、地合いが良好になるものと推測される。比較例C19では、微細繊維量が38[%]よりも大きいが長さ平均繊維長が長さ1.55[mm]よりも大きいため、短繊維と長繊維との差がはっきり見やすくなり、地合いがやや劣るものと推測される。
比較例C12からは、微細繊維量が15[%]未満であることにより、繊維長の長いパルプ繊維(長繊維)の割合が増して長繊維間の隙間が多くなり、罫割が生じやすくなるものと推測される。
上述の実施形態はあくまでも例示に過ぎず、この実施形態で明示しない種々の変形や技術の適用を排除する意図はない。本実施形態の各構成は、それらの趣旨を逸脱しない範囲で種々変形して実施することができる。また、必要に応じて取捨選択することができ、適宜組み合わせることもできる。
ダンボール材が製函システム用の資材である場合には、意図的に形成された切れ込みやミシン目などの追加加工が折目に施されていないことが好ましく、ダンボール材におけるライナの表層に設けられる罫線を起点(たとえば罫線を内側)に180[°]折り返される箇所が折目であることが好ましい。一方、ダンボール材が製函システム用以外の資材である場合には、切れ込みやミシン目などの加工が折目に施されていてもよい。
蛇腹折りのダンボール材には、従来の枚葉のダンボールシートと異なる、複数のシートが折目を介して連設された構造を活かした様々な活用方法がある。
例えば、蛇腹折りのダンボール材は、シートを展開した状態で、延在する方向の寸法が大きいウェブ状の紙資材として扱うこともできる。
災害用品としての利用:窓に貼り付けることで、台風時の窓割れ対策に利用できるほか、避難所でのプライバシー保護やストレス軽減用のパーテーションとしての利用や、緩衝材や冷え対策用の敷物として利用可能である。
イベント行事での利用:イベントや学校行事の看板等の創作物に利用可能である。
建築/引越資材としての利用:建築現場や引越し現場で一時的にドアや壁、扉などを守る必要がある場合、対象物に貼り付けるタイプの保護材(養生材)として活用可能である。対象物に巻き付けるタイプの保護材(梱包資材)として利用することもできる。
何れの利用方法においても、複数のシートが折目を介して連設された構造であることで、作業効率向上や、延在する方向の寸法を確保できるという利点がある。
[IV.付記]
以上の実施形態に関する付記を開示する。
〔付記1〕
中芯に対してライナを貼合したダンボールを用いたダンボール材であって、
前記ライナから切り出した測定片を25[℃]の温度条件のもと周波数100[Hz]の振動条件の引張剪断モードで測定された動的粘弾性が所定の範囲内であり、
前記動的粘弾性は、弾性率E′と、前記弾性率E′に対する損失弾性率E′′の比率であるtanδとの値により規定されており、
前記所定の範囲は、
前記弾性率E′が1.00×109[Mpa]以上であって8.00×109[Mpa]以下であり、
前記tanδが2.50×10-2以上であって1.50×10-1以下である
ことを特徴とするダンボール材。
〔付記2〕
前記弾性率E′が3.00×109[Mpa]以下であって、
前記tanδが7.00×10-2以上である
ことを特徴とする付記1に記載のダンボール材。
〔付記3〕
前記弾性率E′が4.00×109[Mpa]以上であって、
前記tanδが4.00×10-2以下である
ことを特徴とする付記1に記載のダンボール材。
〔付記4〕
前記ライナをなす原紙に用いるパルプのフリーネスが350[ml]以上であって500[ml]以下である
ことを特徴とする付記1~3の何れか1項に記載のダンボール材。
〔付記5〕
前記中芯の両側に対して前記ライナを貼合した両面ダンボールを前記ダンボールとして用いた
ことを特徴とする付記1~4の何れか1項に記載のダンボール材。
〔付記6〕
帯状に連続する前記ダンボールを交互に折り返して積み重ねられた蛇腹折りである
ことを特徴とする付記1~5の何れか1項に記載のダンボール材。
〔付記7〕
中芯に対してライナを貼合したダンボールを用いており、帯状に連続する前記ダンボールを交互に折り返して積み重ねられた蛇腹折りであるダンボール材であって、
前記ライナから切り出した測定片を25[℃]の温度条件のもと周波数100[Hz]の振動条件の引張剪断モードで測定された動的粘弾性が所定の範囲内であり、
前記動的粘弾性は、弾性率E′と、前記弾性率E′に対する損失弾性率E′′の比率であるtanδとの値により規定されており、
前記所定の範囲は、
前記弾性率E′が1.00×109[Mpa]以上であって3.00×109[Mpa]以下であり、
前記tanδが7.00×10-2以上であって1.50×10-1以下であることを特徴とするダンボール材。
〔付記8〕
前記ライナをなす原紙に用いるパルプのフリーネスが350[ml]以上であって500[ml]以下である
ことを特徴とする付記7に記載のダンボール材。
〔付記9〕
前記中芯の両側に対して前記ライナを貼合した両面ダンボールを前記ダンボールとして用いた
ことを特徴とする付記7または8に記載のダンボール材。
〔付記10〕
中芯に対してライナを貼合したダンボールを用いたダンボール材であって、
前記ライナに添加されたサイズ剤の添加量が0.2[質量部]以上であって4.0[質量部]以下であり、
前記ライナに添加された紙力増強剤の添加量が0.1[質量部]以上であって4.0[質量部]以下であり、
前記ライナを構成するパルプ繊維の長さ平均繊維長が0.90[mm]以上であって1.55[mm]以下であり、
前記ライナを構成するパルプ繊維のうち、繊維長が0.0[mm]以上であって0.2[mm]以下である微細繊維の含有される量が23[%]以上であって48[%]以下である
ことを特徴とするダンボール材。
〔付記11〕
前記サイズ剤の添加量が0.8[質量部]以上である
ことを特徴とする請求項10に記載のダンボール材。
〔付記12〕
前記紙力増強剤の添加量が1.0[質量部]以上である
ことを特徴とする請求項10または11に記載のダンボール材。
〔付記13〕
前記長さ平均繊維長が1.50[mm]以上である
ことを特徴とする付記10~12の何れか1項に記載のダンボール材。
〔付記14〕
前記微細繊維の含有される量が40[%]以上である
ことを特徴とする付記10~13の何れか1項に記載のダンボール材。
〔付記15〕
前記中芯の両側に対して前記ライナを貼合した両面ダンボールを前記ダンボールとして用いた
ことを特徴とする付記10~14の何れか1項に記載のダンボール材。
〔付記16〕
帯状に連続する前記ダンボールを交互に折り返して積み重ねられた蛇腹折りである
ことを特徴とする付記10~15の何れか1項に記載のダンボール材。
〔付記17〕
中芯に対してライナを貼合したダンボールを用いたダンボール材であって、
前記ライナの密度が0.60[g/cm3]以上であって0.85[g/cm3]以下であり、
前記ライナを構成するパルプ繊維の長さ平均繊維長が0.98[mm]以上であって1.55[mm]以下であり、
前記ライナを構成するパルプ繊維のうち、繊維長が0.0[mm]以上であって0.2[mm]以下である微細繊維の含有される量が15[%]以上であって38[%]以下である
ことを特徴とするダンボール材。
〔付記18〕
前記密度が0.80[g/cm3]以上であり、
前記長さ平均繊維長が1.10[mm]以上であり、
前記微細繊維の含有される量が18[%]以上である
ことを特徴とする付記17に記載のダンボール材。
〔付記19〕
前記長さ平均繊維長が0.98[mm]以上であって1.05[mm]以下である、
ことを特徴とする付記17に記載のダンボール材。
〔付記20〕
前記中芯の両側に対して前記ライナを貼合した両面ダンボールを前記ダンボールとして用いた
ことを特徴とする付記17~19の何れか1項に記載のダンボール材。
〔付記21〕
帯状に連続する前記ダンボールを交互に折り返して積み重ねられた蛇腹折りである
ことを特徴とする付記17~20の何れか1項に記載のダンボール材。
10 段目(波目)
2 シート
20 シート対
21 第一シート
22 第二シート
23 第三シート
50 折り畳み装置
50A 搬送パート
50B フォールディングパート
50C スタッキングパート
F 折目
L 補助線
L1 縦寸法(第一寸法)
L2 横寸法(第二寸法)
L3 高さ寸法(第三寸法)
Claims (3)
- 中芯に対してライナを貼合したダンボールを用いたダンボール材であって、
前記ライナから切り出した測定片を25[℃]の温度条件のもと周波数100[Hz]の振動条件の引張剪断モードで測定された動的粘弾性が所定の範囲内であり、
前記動的粘弾性は、弾性率E′と、前記弾性率E′に対する損失弾性率E′′の比率であるtanδとの値により規定されており、
前記所定の範囲は、
前記弾性率E′が1.00×109[Mpa]以上であって8.00×109[Mpa]以下であり、
前記tanδが2.50×10-2以上であって1.50×10-1以下である
ことを特徴とするダンボール材。 - 中芯に対してライナを貼合したダンボールを用いたダンボール材であって、
前記ライナに添加されたサイズ剤の添加量が0.2[質量部]以上であって4.0[質量部]以下であり、
前記ライナに添加された紙力増強剤の添加量が0.1[質量部]以上であって4.0[質量部]以下であり、
前記ライナを構成するパルプ繊維の長さ平均繊維長が0.90[mm]以上であって1.55[mm]以下であり、
前記ライナを構成するパルプ繊維のうち、繊維長が0.0[mm]以上であって0.2[mm]以下である微細繊維の含有される量が23[%]以上であって48[%]以下である
ことを特徴とするダンボール材。 - 中芯に対してライナを貼合したダンボールを用いたダンボール材であって、
前記ライナの密度が0.60[g/cm3]以上であって0.85[g/cm3]以下であり、
前記ライナを構成するパルプ繊維の長さ平均繊維長が0.98[mm]以上であって1.55[mm]以下であり、
前記ライナを構成するパルプ繊維のうち、繊維長が0.0[mm]以上であって0.2[mm]以下である微細繊維の含有される量が15[%]以上であって38[%]以下である
ことを特徴とするダンボール材。
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KR1020237043434A KR20240000628A (ko) | 2020-03-31 | 2021-03-30 | 골판지재 |
AU2021249695A AU2021249695B2 (en) | 2020-03-31 | 2021-03-30 | Corrugated fiberboard material |
KR1020237043438A KR20240000629A (ko) | 2020-03-31 | 2021-03-30 | 골판지재 |
KR1020227036414A KR20220154811A (ko) | 2020-03-31 | 2021-03-30 | 골판지재 |
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JP2020-075604 | 2020-04-21 | ||
JP2020075603A JP6822593B1 (ja) | 2020-04-21 | 2020-04-21 | ダンボール材 |
JP2020-075603 | 2020-04-21 | ||
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