JP7336908B2 - thin paper storage box - Google Patents

Description

The present invention relates to a thin paper storage box.

Cartons of tissue paper generally have their paper surfaces processed for the purpose of encouraging consumers to purchase them and imparting abrasion resistance. Appropriate glossiness is required to encourage consumers to purchase. In addition, it is also important to have a smooth feel when touching the product.

For example, in Patent Document 1, an invention has been made to provide a suede-like printed material with excellent abrasion resistance by applying a water-based ultraviolet curable overprint varnish containing microbeads.

International Publication No. 2015/029878 Pamphlet

However, in general, when the carton has a smooth surface, it feels sticky to the touch. In addition, the glossiness is also increased. On the other hand, when the glossiness is set in a moderate range, unevenness is present on the surface, resulting in poor cosmetic properties and poor tactile sensation.
Moreover, in the case of the storage box of Patent Document 1, the presence of the beads causes irregularities on the surface, and a smooth feel cannot be obtained. Furthermore, in the case of thin paper storage boxes, when embossing or ruled lines are applied, the unevenness of the surface overlaps with the processed part, causing the unevenness to stand out and the coating layer to crack. Make-up deteriorates.

Accordingly, it is an object of the present invention to provide a thin paper storage box that is smooth while having an appropriate degree of glossiness and feel, is excellent in processing suitability such as friction resistance and transportability, and is excellent in beauty. aim.

The inventors of the present invention conducted extensive research in view of the above problems. As a result, the inventors have found that the above problems can be solved by setting the average surface height Rc and the glossiness of the thin paper storage box to values within predetermined ranges, and have completed the present invention. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a thin paper storage box comprising a substrate and a varnish coating layer on the surface of the substrate, wherein the substrate is Cascoated paper and the coated The thin paper storage box is characterized in that the average height Rc of the surface of the thin paper storage box including the layer is 2.0 or less and the glossiness is 60% or more and 80% or less.

(2) A second aspect of the present invention is the thin paper storage box according to (1), characterized in that the static friction coefficient of the surface of the thin paper storage box is 0.15 or more and 0.50 or less. It is characterized by

(3) A third aspect of the present invention is the thin paper storage box according to (1) or (2), wherein the dynamic friction coefficient of the surface of the thin paper storage box is 0.10 or more and 0.40 or less. It is characterized by

(4) A fourth aspect of the present invention is the thin paper storage box according to any one of (1) to (3), wherein the thin paper storage box has a top surface portion, a bottom surface portion, and left and right sides in an unfolded state. A flap is provided on a side portion, and the bending stiffness of the flap is 80 gf/50 mm or more and 160 gf/50 mm or less.

(5) A fifth aspect of the present invention is the thin paper storage box according to any one of (1) to (4), wherein the height dimension of the thin paper storage box is 65 mm or more and 135 mm or less. It is characterized by

(6) A sixth aspect of the present invention is the thin paper storage box according to any one of (1) to (5), wherein the Cass coated paper including the coating layer has a basis weight of 200 g/m It is characterized by being ² or more and 550 g/m ² or less.

Therefore, according to the present invention, it is possible to provide a thin paper storage box that is smooth while having an appropriate degree of glossiness and touch feeling, is excellent in processing suitability such as friction resistance and transportability, and is excellent in beauty. be able to.

1(a) is a perspective view showing the appearance of the thin paper storage box according to the present invention, and (b) is a perspective view showing the appearance of the thin paper storage box according to the present invention when it is used. 1 is an unfolded plan view of a thin paper storage box according to the present invention; FIG.

Embodiments of the present invention will be described in detail below, but the following embodiments are presented for the purpose of illustration, and the present invention is not limited to the embodiments shown below. The same numbers are given to the same elements throughout the description of the embodiment.

<Thin paper storage box>
As an example of the present embodiment, a thin paper storage box 1 for storing tissues 6 as thin paper will be described. FIG. 1(a) is a perspective view showing the appearance of a thin paper storage box 1 according to the present invention, and FIG. 1(b) is a perspective view showing the appearance during use. As shown in FIG. 1(a), the appearance of the thin paper storage box 1 consists of a top surface portion 2 having an outlet 2a for tissues 6, a bottom surface portion 3 facing the top surface portion 2, and left and right sides connecting the top surface portion 2 and the bottom surface portion 3. is a box partitioned by side portions 4, 4', 5, 5'. In addition, stacked tissues 6 are stored in the inner space of the thin paper storage box 1, and the tissues 6 can be taken out from the outlet 2a (see FIG. 1(b)). . In this specification, the longitudinal direction refers to a direction parallel to the outlet 2a on the top surface 2 of the thin paper storage box 1 and is the direction indicated by Y in the figure, and the width direction is perpendicular to the longitudinal direction. direction, which is indicated by X in the figure. Furthermore, the height direction is a direction perpendicular to the longitudinal direction and the width direction, and is indicated by Z in the drawing.

FIG. 2 is an unfolded plan view of the thin paper storage box 1 according to the present invention. As shown in FIG. 2, this thin paper storage box 1 is made from one sheet of material called carton blanks a, and each flap of a top surface 2, a bottom surface 3, and left and right side surfaces 4, 4', 5, 5' is formed. It is formed by bending and adhering the abutting portions of each flap with a hot-melt adhesive or the like.
At this time, the bending stiffness of each flap is preferably 80 gf/50 mm or more and 160 gf/50 mm or less, more preferably 90 gf/50 mm or more and 150 gf/50 mm or less, and 100 gf/50 mm or more and 140 gf/50 mm or less. More preferred. If the bending stiffness is less than 80 gf/50 mm, the flaps tend to bend, and the flaps are displaced during bonding, resulting in a deterioration in the appearance of the thin paper storage box 1 . If the bending stiffness exceeds 160 gf/50 mm, the bending resistance is large, and processing defects may occur during processing.

In order to optimize the bending stiffness strength of the flap, it is possible to adjust the bending stiffness of the base material including the coating layer, which will be described later, based on JIS P 8125. The bending stiffness in the CD direction of the substrate including the coating layer is preferably 5 mN m or more and 20 mN m or less, more preferably 7 mN m or more and 17 mN m or less, and 9 mN m or more and 15 mN m More preferably: In addition, the bending stiffness in the MD direction is preferably 15 mN-m or more and 45 mN-m or less, more preferably 20 mN-m or more and 40 mN-m or less, and 25 mN-m or more and 35 mN-m or less. More preferred.
Also, the bending stiffness of the flap can be made appropriate by adjusting the thickness of the base material including the coating layer, which will be described later. At this time, the thickness per substrate including the coating layer is preferably 230 μm or more and 750 μm or less, preferably 330 μm or more and 700 μm or less, and more preferably 380 μm or more and 600 μm or less. Here, the MD direction of the substrate corresponds to the height direction of the thin paper storage box 1, and the CD direction of the substrate is a direction perpendicular to the MD direction.

In this embodiment, as the base material constituting the thin paper storage box 1, Cass coated paper is used. At this time, the basis weight of the Cass-coated paper containing the coating layer described later is preferably 200 g/m ² or more and 550 g/m ² or less, more preferably 250 g/m ² or more and 500 g/m ² or less, It is more preferably 300 g/m ² or more and 450 g/m ² or less. If the basis weight is less than 200 g/m ² , the thin paper storage box 1 will be crushed, resulting in poor cosmeticity. If the basis weight exceeds 550 g/m ² , the bending stiffness of the flap increases, which may cause processing defects in the thin paper storage box 1 .

The longitudinal dimension of the thin paper storage box 1 is preferably 100 mm or more and 290 mm or less, more preferably 150 mm or more and 270 mm or less, and even more preferably 200 mm or more and 250 mm or less. The dimension in the width direction is preferably 80 mm or more and 150 mm or less, more preferably 90 mm or more and 140 mm or less, and even more preferably 100 mm or more and 135 mm or less.
The height dimension of the thin paper storage box 1 is preferably 65 mm or more and 135 mm or less, more preferably 80 mm or more and 120 mm or less, and even more preferably 95 mm or more and 110 mm or less. If the height direction is less than 65 mm, the thin paper storage box 1 becomes small and the cosmeticity deteriorates. If the height exceeds 135 mm, the thin paper storage box 1 is likely to be crushed, resulting in poor cosmetic appearance.

The thin paper storage box 1 is provided with a varnish coating layer on the surface of the base material, and the content of the granular beads and matte pigments contained in the varnish is preferably 15% or less. More preferably 10% or less, still more preferably 5% or less. If the content of the beads and pigment exceeds 15%, the average height Rc of the surface of the thin paper storage box 1 increases, and a smooth feel cannot be obtained.
Granular beads and matte pigments include urethane beads, precipitated barium sulfate, magnesium carbonate, polyvinyl chloride powder, urea resin, polyethylene powder, silica, and the like. The varnish of the coating layer is not particularly limited as long as it is cured by heating, cooling or ultraviolet rays (UV), but preferably contains an acrylic polymer.

The average surface height Rc of the thin paper storage box 1 including the coating layer is 2.0 or less, preferably 1.5 or less, and more preferably 1.0 or less. If Rc exceeds 2.0, the surface of the substrate becomes rough, and the texture of the thin paper storage box 1 is poor. Moreover, it is also inferior in abrasion resistance.
Further, the glossiness of the surface of the thin paper storage box 1 is 60% or more and 80% or less, preferably 63% or more and 78% or less, and more preferably 65% or more and 75% or less. When the glossiness is within the above numerical range, the thin paper storage box 1 having good cosmetic properties can be obtained.
In addition, when the thin paper storage box 1 is sold at a store, it is preferable that the thin paper storage box 1 is not wrapped in a film so that the texture and glossiness of the thin paper storage box 1 can be conveyed.

The coefficient of static friction of the surface of the substrate is preferably 0.15 or more and 0.50 or less, more preferably 0.20 or more and 0.45 or less, and further preferably 0.30 or more and 0.40 or less. preferable. If the coefficient of static friction is less than 0.15, the thin paper storage box 1 will slip during the manufacturing process, resulting in poor transport. If it exceeds 0.50, the thin paper storage box 1 has a poor feel to the touch, and it is difficult to slip during the manufacturing process, which may lead to defective transportation.

In addition, the dynamic friction coefficient of the surface of the substrate is preferably 0.10 or more and 0.40 or less, more preferably 0.15 or more and 0.35 or less, and 0.20 or more and 0.30 or less. is more preferred. If the coefficient of dynamic friction is less than 0.10, the thin paper storage box 1 will slip during the manufacturing process, resulting in poor transport. If it exceeds 0.40, the texture of the thin paper container 1 is poor, and it is difficult to slip during the manufacturing process, which may lead to defective transportation.

The tissue 6 stored in the thin paper storage box 1 preferably has a basis weight of 12.0 g/m ^{2 or} more and 18.0 g/m ² or less, and more preferably 14.0 g/m ^{2 or} more and 16.0 g/m ² or less. It is more preferable to have Also, the number of pairs is preferably 180 or more and 260 or less, more preferably 200 or more and 240 or less. Also, the weight of the clip is preferably 200 g or more and 450 g or less, more preferably 280 g or more and 370 g or less. When the basis weight, the number of sets, and the clip weight of the tissue 6 are within the above numerical ranges, the transportability and workability of the thin paper storage box 1 are improved.

Although the present invention has been described using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be clear to those skilled in the art that improvements are possible. In addition, it is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. It should be noted that the present invention is by no means limited to the examples shown below.

Thin paper storage boxes of Examples 1 to 19 and Comparative Examples 1 to 10 shown in Tables 1 and 2 were prepared. At this time, all the thin paper storage boxes had a lengthwise dimension of 245 mm and a widthwise dimension of 120 mm.
Moreover, each measured value was measured by the following method.

Average surface height Rc: Measured with a one-shot 3D shape measuring machine Head VR-3100 (manufactured by Keyence Corporation) in accordance with the method described in JIS B 0601 (2001).
Measurement conditions: magnification: 160 times, measurement area: 1.9 mm × 1.4 mm, tilt correction: automatic, cutoff: λ _S = none, λ _C = none, roughness standard: ISO 4287:1997 (JIS B 0601 : 2001). An image analysis software (VK Analyzer) was used to determine the average surface height Rc from the resulting images. The average height Rc of the surface was measured at locations that did not include foil stamping, embossing, or ruled lines.

Glossiness: Measured according to JIS P 8142 (2005). The measurement conditions were as follows: measurement method: reflection, measurement angle: 75 degrees. Glossiness was measured at a location that did not include foil stamping, embossing, or ruled lines.

Friction coefficient: Measured according to ISO 15359 using an automatic friction tester NSF-100 (manufactured by Nomura Shoji Co., Ltd.). In ISO 15359, the same sample is used to measure the static friction coefficient three times, and the first and third values are adopted. In the present invention, the value of the first time was adopted. For the measurement, the substrate was cut so that the CD direction was 16 cm and the MD direction was 6 cm, and the coefficient of friction between the surfaces of the substrate including the coating layer was measured. The measurement was repeated 10 times, and the average value was taken as the measured value.

Bending stiffness of flap: Measured according to JIS P 8111. Each flap including the side portion was cut out from a thin paper storage box, and after humidity control, it was cut to a width of 50 mm. The 90° bending resistance value was measured using BST-150M (manufactured by Katayama Die Mfg. Co., Ltd.). The measured value was taken as the average value of the measurements taken three times by folding in the direction opposite to the already folded direction. It should be noted that the bending position may be either inside or outside the ruled line portion when the measurement is performed.

Basis weight of substrate including coating layer: Measured based on JIS P 8124.

Thickness of substrate including coating layer: Measured based on JIS P 8118:2014. In addition, the measurement was repeated 10 times for one thin paper storage box, and the average value was used as the measured value. In addition, foil stamping, embossing, and areas other than ruled lines were subjected.

Bending stiffness of substrate including coating layer: Measured based on JIS P 8125:2000. The bending angle was 15° and the width of the test piece was 38 mm.

Moreover, each evaluation was performed based on the following methods and criteria.

<Evaluation method>
Twenty monitors conducted the evaluation by selecting "good" or "bad" for each evaluation item. Evaluation criteria are as follows. ⊚, ∘, and Δ were regarded as acceptable.
◎: 18 to 20 people rated “good” ○: 14 to 17 people rated “good” △: 10 to 13 people rated “good” ×: 6 people rated “good” More than 9 people or less XX: There is no "good" or 1 or more and 5 people or less Each evaluation item is shown below.

Cosmetic property of storage box: Tissue paper storage boxes were arranged on a shelf, and the appearance was evaluated.

Touch of storage box: The touch of the thin paper storage box was evaluated.

Abrasion resistance: Evaluation was made on the abrasion resistance of the thin paper storage box immediately after production.

Misalignment of flaps: Misalignment of flaps was evaluated visually.

Collapse of storage box: Collapse of the thin paper storage box was visually evaluated.

Transportability: The transportability at the time of production was evaluated.

Workability: The workability during production was evaluated.

The results obtained are shown in Tables 1 and 2.

As described above, the thin paper storage box of the present invention is smooth while having an appropriate glossiness and a feeling of touch, is excellent in processability such as friction resistance and transportability, and is excellent in cosmeticity. I know there is.

1 thin paper storage box 1a carton blanks 2 top face 2a take-out port 3 bottom face 4, 4', 5, 5' left and right side faces 6 tissue

Claims (6)

a substrate;
A thin paper storage box comprising a varnish coating layer on the surface of the base material,
The base material is Cass-coated paper,
The content of granular beads and matte pigments contained in the varnish of the coating layer is 15% or less,
A thin paper storage box, characterized in that the average height Rc of the surface of the thin paper storage box including the coating layer is 2.0 or less, and the glossiness is 60% or more and 80% or less. 2. The thin paper storage box according to claim 1, wherein the static friction coefficient of the surface of said thin paper storage box is 0.15 or more and 0.50 or less. 3. The thin paper storage box according to claim 1, wherein the dynamic friction coefficient of the surface of said thin paper storage box is 0.10 or more and 0.40 or less. The thin paper storage box has flaps on the top surface, the bottom surface, and the left and right side surfaces in the unfolded state,
4. The thin paper storage box according to claim 1, wherein the bending stiffness of the flap is 80 gf/50 mm or more and 160 gf/50 mm or less. 5. The thin paper storage box according to claim 1, wherein the height dimension of said thin paper storage box is 65 mm or more and 135 mm or less. The thin paper storage box according to any one of Claims 1 to 5, wherein the basis weight of the Cass coated paper including the coating layer is 200 g/m2 ^or more and 550 g/ ^m2 or less.

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