JP7055583B2 - Container paper sheet and its manufacturing method, container paper sheet manufacturing equipment, and container - Google Patents

Description

The present invention relates to an embossed container paper sheet and a method for manufacturing the same, an apparatus for manufacturing the container paper sheet, and a container using the container paper sheet.

Conventionally, a cup-shaped paper container (paper cup) consisting of a body and a bottom and having an open top has been used. In addition to cold drinking water, this paper cup is known to have been heat-insulated so that the outer circumference thereof can be safely grasped by fingers even if it contains hot drinking water or the like.
For example, Patent Document 1 and Patent Document 2 are embossed in which a plurality of convex portions are regularly and repeatedly formed on the outer peripheral surface of the body of the cup body in order to impart heat insulating properties to the paper cup. Disclosed is a heat insulating paper cup wrapped and attached with a paper heat insulating sheet. According to such a heat-insulating paper cup, the heat of the high-temperature contents is difficult to be directly transferred to the outer periphery of the paper cup due to the plurality of protrusions formed on the heat-insulating sheet. It can be easily grasped with fingers.

Japanese Unexamined Patent Publication No. 2001-294218 Japanese Unexamined Patent Publication No. 2000-43954

In the paper heat insulating sheet as described above, for example, a blank of the base paper is passed between a pair of embossed rolls composed of a male stamp and a female stamp in which the uneven shape of the male is inverted. It can be produced by this.
However, when the heat insulating sheet is manufactured by such roll processing, wrinkles are generated in the blank, depending on the contour shape of the convex portion constituting the embossed pattern, the height of the convex portion, or the arrangement configuration of the convex portion. It turned out that it may end up. Specifically, as shown in FIG. 5, a vertical line groove 31 extending in the vertical direction (y direction in FIG. 5), which is the traveling direction passing between the embossed rolls, and a horizontal direction perpendicular to the vertical direction (FIG. 5). When forming an embossed pattern in which a convex portion 33 is formed in a cell partitioned by a horizontal line groove 32 extending along the x direction in 5), wrinkles extending in the left-right direction occur in the vertical line groove 31. There was a problem that it would end up. This is due to the characteristic that the blank is sandwiched between a pair of embossed rolls and pulled by hand in the traveling direction, and as shown in FIGS. 6A and 6B, the upper and lower parts in the area including the horizontal line groove 32 and the protrusion 33 Any line segment extending in the direction (y direction in FIG. 6A) (line segment r1 along the cross section G according to the dotted line g in FIG. 5 in FIG. 6A) is uneven along the traveling direction (y direction in FIG. 6A). In the corresponding line segment in the area on the vertical line groove 31 (the line segment r2 along the cross section H according to the dotted line h in FIG. 5 in FIG. 6B), while the ridge line has to be long for the formation of It is considered that the ridgeline is shorter than the portion including the horizontal line groove 32 and the convex portion 33 because the unevenness is not formed, and therefore the blank is left over. In particular, in embossing, by increasing the height of the convex portion 33, clear irregularities are formed and high heat insulating properties can be obtained, but as the height of the convex portion 33 is increased, wrinkles are clearly carved. There was a problem. If the height of the convex portion 33 is excessively high, the blank of the base paper will be damaged.

The present invention solves the above-mentioned problems, and an object thereof is a container paper sheet in which a plurality of convex portions are clearly formed in embossing and the generation of wrinkles is suppressed, a method for manufacturing the same, and a container paper. The purpose is to provide a sheet manufacturing device as well as a container.

The container paper sheet of the present invention is an embossed container paper sheet in which a plurality of convex portions are regularly and repeatedly formed on the surface.
A horizontal line groove extending in the left-right direction so as to partition the plurality of protrusions in the up-down direction,
It has a vertical line groove extending in the vertical direction so as to partition the plurality of convex portions in the left-right direction.
The vertices of the plurality of protrusions are located at a level higher than the bottom of the horizontal line groove, and the bottom of the vertical line groove is located at a level lower than the bottom of the horizontal line groove.
The ratio (d / h) of the height (h) of the apex of the convex portion from the bottom of the horizontal line groove to the depth (d) of the vertical line groove from the bottom of the horizontal line groove is 0. It is characterized by being 0.8 to 1.3 .

The container of the present invention is a container composed of a cup body having an open upper portion consisting of a body portion and a bottom portion that closes the lower portion of the body portion, and a container paper sheet wound so as to cover the outer peripheral surface of the body portion. hand,
The container paper sheet is characterized by being made of the container paper sheet.

In the method for manufacturing a sheet made of container paper of the present invention, a paper blank is passed between a pair of embossing rolls facing each other, and embossing is performed on the surface of the blank so that a plurality of convex portions are regularly and repeatedly formed. This is a method for manufacturing a container paper sheet for manufacturing the above-mentioned container paper sheet.
A stamp formed on the surface of one of the embossed rolls has a protruding portion that protrudes outward so as to correspond to the plurality of convex portions, and a vertical extending portion that extends in the vertical direction so as to partition the protruding portion in the left-right direction. It has an inwardly recessed portion corresponding to the line groove, and the stamp formed on the surface of the other embossed roll inverts the uneven shape of the stamp formed on the surface of the one embossed roll. It is characterized by having an embossed shape.

The container paper sheet manufacturing apparatus of the present invention includes a pair of facing embossed rolls, and a paper blank is passed between the pair of embossed rolls so that a plurality of protrusions are regularly formed on the surface of the blank. An apparatus for manufacturing a container paper sheet for manufacturing the above-mentioned container paper sheet by repeatedly forming embossing.
A stamp formed on the surface of one of the embossed rolls has a protruding portion that protrudes outward so as to correspond to the plurality of convex portions, and a vertical extending portion that extends in the vertical direction so as to partition the protruding portion in the left-right direction. It has an inwardly recessed portion corresponding to the line groove, and the stamp formed on the surface of the other embossed roll inverts the uneven shape of the stamp formed on the surface of the one embossed roll. It is characterized by having an embossed shape.

The container paper sheet of the present invention is embossed so that a plurality of convex portions are formed in each cell partitioned by the horizontal line groove and the vertical line groove, and the vertices of the plurality of convex portions are horizontal. It is located at a higher level than the bottom of the line groove and the bottom of the vertical line groove is located at a lower level than the bottom of the horizontal line groove. According to the container paper sheet of the present invention having such a structure, the generation of wrinkles is suppressed while a plurality of convex portions are clearly formed in the embossing process. As a result, it is possible to easily provide a container having a high-quality design and a high heat insulating property by using a container paper sheet.

According to the container of the present invention, since the sleeve covering the outer peripheral surface of the body portion or the body portion itself is formed by the above-mentioned container paper sheet, high heat insulation and high-quality design can be obtained.

In the method for producing a container paper sheet and the container paper sheet manufacturing apparatus of the present invention, a paper blank is passed between a pair of embossed rolls having a concave-convex shape stamp that is inverted from each other and passed on the surface of the blank. It is embossed, and the stamp formed on the surface of one of the embossed rolls is up and down so that the protruding part protrudes outward so as to correspond to a plurality of convex parts and the protruding part is divided in the left-right direction. It has an inwardly recessed portion corresponding to a vertical line groove extending along the direction. Therefore, according to this method for manufacturing a container paper sheet and the container paper sheet manufacturing apparatus, a plurality of convex portions are formed in an embossed pattern formed by partitioning a plurality of convex portions by a horizontal line groove and a vertical line groove. It is possible to easily form a shape in which the apex of the vertical line groove is located at a level higher than the bottom of the horizontal line groove and the bottom of the vertical line groove is located at a level lower than the bottom of the horizontal line groove. That is, it is possible to easily manufacture a container paper sheet in which the above-mentioned wrinkles are suppressed at high speed.

It is explanatory plan view which shows the contour shape of the container paper sheet of this invention. It is explanatory perspective view which shows an example of the embossing pattern of the container paper sheet of this invention. (A) It is explanatory cross-sectional view which shows the cross section along the dotted line s of FIG. (B) It is explanatory cross-sectional view which shows the cross section along the dotted line t of FIG. (C) It is explanatory cross-sectional view which shows the cross section along the dotted line u of FIG. (D) It is explanatory cross-sectional view which shows the cross section along the dotted line v of FIG. It is explanatory top view which shows another example of the embossing pattern of the container paper sheet of this invention. It is explanatory perspective view which shows the embossing pattern of the conventional container paper sheet. (A) It is explanatory cross-sectional view which shows the cross section along the dotted line g of FIG. (B) It is explanatory cross-sectional view which shows the cross section along the dotted line h of FIG.

Hereinafter, the present invention will be described in detail.
[Container paper sheet]
The container paper sheet 10 according to an embodiment of the present invention is used as a sleeve wound so as to cover the outer peripheral surface of the body portion of the cup body having an open upper portion, and a plurality of convex portions 23 are formed on the surface thereof. The embossed pattern 20 is formed by being subjected to an embossing process that is regularly and repeatedly formed. The container paper sheet 10 may be embossed on the entire surface or embossed on a part of the surface.
As shown in FIG. 1, the container paper sheet 10 has, for example, a fan-shaped outer contour shape. Specifically, the great arc-shaped portion 11 and the small arc-shaped portion 12, and the straight line portion 13 connecting both ends of these two large and small arc-shaped portions 11 and 12 with a straight line extending radially around the position of the main point of the fan. It has a fan shape surrounded by, 14.

As shown in FIG. 2, the embossed pattern 20 formed on the container paper sheet 10 has a plurality of convex portions 23, and extends along the left-right direction so as to partition the plurality of convex portions 23 in the vertical direction. It has a horizontal line groove 22 and a vertical line groove 21 extending in the vertical direction so as to partition a plurality of convex portions 23 in the left-right direction, and is partitioned by being surrounded by the horizontal line groove 22 and the vertical line groove 21. One convex portion 23 is arranged and formed in one cell.
In the present invention, the vertical direction is the direction in which the straight line connecting the midpoint P of the large arcuate portion 11 and the midpoint Q of the small arcuate portion 12 extends in the fan-shaped container paper sheet 10 (in FIG. 1). The y direction), and the left-right direction means a direction perpendicular to the up-down direction (x-direction in FIG. 1).
The vertical line groove 21 is, for example, a bottomed groove having a rectangular cross section, and extends radially and linearly from the small arc-shaped portion 12 to the great circle-shaped portion 11 around the key position of the fan of the container paper sheet 10. be. That is, the outer edge of the vertical line groove 21 according to this embodiment is composed of a straight line. Further, as another embodiment, the vertical line groove 21 may meander and extend substantially radially around the position of the main point of the fan, and the outer edge thereof may be composed of a curved line.
The vertical line groove 21 has an inclination angle of 0 ° or more and less than ± 45 ° with respect to the vertical direction when the inclination angle in the vertical direction is considered in the range of −90 ° to + 90 °. When the vertical line groove 21 meanders and extends, the inclination angle of the tangent line with respect to the vertical direction at any position on the outer edge thereof may be within the range of 0 ° or more and less than ± 45 °.
The width of the vertical line groove 21 is, for example, 1.0 mm or more, specifically 1.0 to 10.0 mm. If the width of the vertical line groove 21 is too small, the blank will be cracked or damaged because the portion to be the convex portion 23 will be strongly pressed by the stamping die when embossing the blank of the base paper as described later. May occur.

The horizontal line groove 22 has an inclination angle of ± 45 ° or more and ± 90 ° or less with respect to the vertical direction of the tangent line of the outer edge thereof. When the horizontal line groove 22 is not linear, the inclination angle of the tangent line with respect to the vertical direction may be within a range of ± 45 ° or more and ± 90 ° or less at any position on the outer edge thereof.
The horizontal line groove 22 extends in an arc shape in parallel with the great circle-shaped portion 11 and the small arc-shaped portion 12, and is formed between all the vertical line grooves 21. That is, it extends from the nth vertical line groove 21 to the adjacent n + 1th vertical line groove 21 while partitioning the arbitrary two convex portions 23 that are continuously arranged in the vertical direction in the vertical direction.
In the container paper sheet 10 of this embodiment, the plurality of horizontal line grooves 22 are arranged on an arc parallel to the great circle-shaped portion 11, that is, the plurality of horizontal line grooves 22 are arranged from the straight portion 13 to the straight portion. Up to 14, they are intermittently arranged on the same arc except for the portion intersecting the vertical line groove 21. By arranging the plurality of horizontal line grooves 22 in this way, the convex portions 23 are arranged vertically and horizontally in a grid pattern in a plan view. Further, as shown in FIG. 4, the plurality of horizontal line grooves 22 may be arranged such that the horizontal line grooves 22 adjacent to each other in the arc direction are offset by half a pitch in the vertical direction. By arranging the plurality of horizontal line grooves 22 in this way, the convex portions 23 are also arranged in a staggered manner in a plan view with a deviation of half a pitch.
The horizontal line groove 22 is a bottomed groove having a rectangular cross section, and the width of the horizontal line groove 22 is, for example, 1.0 mm or more, specifically 1.0 to 10.0 mm. If the width of the horizontal line groove 22 is too small, as will be described later, when embossing the blank of the base paper, the portion to be the convex portion 23 is strongly pressed by the stamping die, so that the blank is cracked or damaged. May occur.

The plurality of convex portions 23 constituting the embossed pattern 20 have substantially the same shape, for example, having a substantially rectangular peripheral edge (contour) in a plan view and having a trapezoidal, rectangular or semicircular cross section. It is said that. Specifically, the contour consisting of four side wall surfaces rising from the four sides of the cell toward the center side of the cell and a surface containing all the upper ends of the four side wall surfaces has a substantially rectangular top.
When the convex portion 23 has a trapezoidal cross section, the angle of the side wall surface with respect to the direction perpendicular to the container paper sheet 10 (z direction in FIG. 2) is 50 ° or less, for example, 20 °. To.

Then, in the container paper sheet 10 according to the embodiment of the present invention, as shown in FIGS. 3A to 3D, the depth from the apex of the convex portion 23 to the bottom of the vertical line groove 21 is the convex portion 23. It is deeper than the depth from the apex to the bottom of the horizontal line groove 22. That is, the apex of the convex portion 23 is located at a level higher than the bottom of the horizontal line groove 22, and the bottom of the vertical line groove 21 is located at a level lower than the bottom of the horizontal line groove 22.
The ratio (d / h) of the height (h) of the apex of the convex portion 23 from the bottom of the horizontal line groove 22 to the depth (d) of the horizontal line groove 22 of the vertical line groove 21 is, for example. It is set to 0.8 to 1.3. When the ratio (d / h) is in this range, wrinkles are suppressed from being generated on the obtained container paper sheet 10, or even if wrinkles are generated, they are fine and inconspicuous, and as a result, the design is good. Highly embossed pattern 20 can be obtained. The ratio (d / h) is particularly 1.0, that is, the height from the bottom of the horizontal line groove 22 to the apex of the convex portion 23 and the depth from the bottom of the horizontal line groove 22 to the bottom of the vertical line groove 21 are the same. It is said that. The container paper sheet 10 obtained by setting the height from the bottom of the horizontal line groove 22 to the apex of the convex portion 23 and the depth from the bottom of the horizontal line groove 22 to the bottom of the vertical line groove 21 to be the same. The occurrence of wrinkles is surely suppressed, and the embossed pattern 20 with high design is surely obtained.
The difference between the maximum height and the minimum height in the embossed pattern 20, that is, the depth d _max from the apex of the convex portion 23 to the bottom of the vertical line groove 21 is, for example, 0.3 to 1.5 mm. It is 8 mm.
If the depth from the apex of the convex portion 23 to the bottom of the vertical line groove 21 is excessively deep, the portion to be the convex portion 23 is strongly pressed by the stamping die when embossing the blank of the base paper as described later. As a result, the blank may be cracked or damaged.

The repeating pitch p2 along the horizontal line groove 22 of the convex portion 23 constituting the embossed pattern 20 is set to be within the range of 2.0 to 20.0 mm. The pitch p2 along the horizontal line groove 22 of the convex portion 23 is from the end of one convex portion 23 on the one straight line portion 13 side of the container paper sheet 10 to the one straight portion 13 side of the adjacent convex portion 23. It is said to be up to the end of.
Further, the repeating pitch p1 along the vertical line groove 21 of the convex portion 23 constituting the embossed pattern 20 is set to be within the range of 2.0 to 20.0 mm. The pitch p1 along the vertical line groove 21 of the convex portion 23 is from the end portion of one convex portion 23 on the great circle-shaped portion 11 side of the container paper sheet 10 to the great circle-shaped portion 11 side of the adjacent convex portion 23. It is said to be up to the end of.
If the pitch is too fine, the height of the convex portion 23 cannot be secured, and as a result, sufficient space is provided between the container paper sheet 10 formed by the convex portion 23 and the body of the cup body. There is a possibility that sufficient heat insulating properties cannot be obtained because the size cannot be obtained, and there is a possibility that the uneven design becomes difficult to recognize and the design is inferior. On the other hand, if the pitch is excessively coarse, the size of the space between the container paper sheet 10 formed by the convex portion 23 and the body of the cup body becomes excessively large, and as a result, the convex portion 23 is easily deformed and has rigidity. May be inferior to.

The container paper sheet 10 is made of, for example, a paper material having a basis weight of 150 to 300 g / m ² .

The container paper sheet 10 as described above is embossed so that a plurality of convex portions 23 are formed in each cell partitioned by the horizontal line groove 22 and the vertical line groove 21, and the plurality of convex portions are formed. The apex of the portion 23 is located at a level higher than the bottom of the horizontal line groove 22, and the bottom of the vertical line groove 21 is located at a level lower than the bottom of the horizontal line groove 22. By having such a configuration, the generation of wrinkles is suppressed while a plurality of convex portions 23 are clearly formed in the embossing process.
It has an embossed pattern 20 in which the vertices of the plurality of convex portions 23 are located at a level higher than the bottom of the horizontal line groove 22 and the bottom of the vertical line groove 21 is located at a level lower than the bottom of the horizontal line groove 22. The following (1) and (2) can be considered as the reasons why the occurrence of wrinkles in the vertical line groove 21 is suppressed in the container paper sheet 10.
(1) As shown in FIGS. 3A (a) and 3B (b), any line segment extending in the vertical direction (y direction in FIGS. 3A and 3B) in the area including the horizontal line groove 22 and the convex portion 23. (Line segment w1 along the cross section S in FIG. 3A) and a line segment in the area on the vertical line groove 21 extending in the same length and direction as the line segment w1 (line segment along the cross section T in FIG. 3B). When compared with w2), it is presumed that the difference in the length of the ridge line can be suppressed to be small. Specifically, the horizontal line groove 22 is configured to be shallower in the container paper sheet 10 of the present invention as compared with the case where the horizontal line groove has the same depth as the vertical line groove (see FIGS. 6A and 6B). Therefore, the length of the ridge line of the line segment w1 that vertically traverses the convex portion 23 and the horizontal line groove 22 becomes shorter, and is generated by the difference in length between the ridge line of the line segment w1 and the ridge line of the line segment w2. It is presumed that the wrinkles that are thought to be suppressed.
(2) The depth of the vertical line groove 21 is relatively deeper than the depth of the horizontal line groove 22, in other words, the vertical line groove 21 is convex toward the back surface, so that the horizontal line groove 22 and the convex portion 23 are formed. It is also presumed that the occurrence of wrinkles is suppressed by extending the blank portion, which should be slack and excessively wrinkled as compared with the portion including the portion, to the back surface side in the formation of the vertical line groove 21.

〔container〕
The container according to an embodiment of the present invention is wound so as to cover the cup body having an open top, which consists of an inverted truncated cone-shaped body and a bottom that closes the lower part of the body, and an outer peripheral surface of the body. It is made of a sleeve, and the sleeve is made of the above-mentioned container paper sheet 10.
The body of the cup body of the container is formed by winding a fan-shaped base material into an inverted conical cylinder, and when the upper part is configured as an opening, for example, the peripheral edge of the opening is rolled outward. It constitutes the curl part.
The bottom of the cup body of the container is closed by a circular bottom plate. The peripheral edge of the bottom plate is bent downward to form a peripheral wall portion, and such a peripheral wall portion is sandwiched between a lower end portion of the body portion of the cup body and a folded portion. The bottom of the cup body is blocked by this.
Then, a fan-shaped container paper sheet 10 having an embossed pattern 20 formed on the surface thereof is wound around the outer peripheral surface of the body of the cup body without a gap with the convex portion 23 of the embossed pattern 20 on the outside. One end (straight line portion) 13 and the other end (straight line portion) 14 of the container paper sheet 10 having a shape are overlapped with each other, and in this state, they are attached with an appropriate adhesive to form a cup body. Is fixed to.
In this container, a space is formed between the outer peripheral surface of the cup body and the inside of the convex portion 23 forming the embossed pattern 20 of the container paper sheet 10, and the heat insulating property is exhibited.

As the base material constituting the body of the cup body, for example, a cup base paper having a basis weight of about 150 to 300 g / m ² or a polyethylene processed paper in which polyethylene resin is applied to both sides of the cup base paper or one side inside the cup. , Resin sheets and the like can be used.

Such containers can be used for various purposes. For example, it can be used as a container for beverages, a filling container for flower pots and snack foods, and a container for filling various other contents.
According to such a container of the present invention, since the sleeve covering the outer peripheral surface of the body portion is formed by the above-mentioned container paper sheet 10, high heat insulating properties and high-quality design can be obtained.

[Manufacturing method and equipment for container paper sheets]
The container paper sheet 10 as described above uses a manufacturing apparatus provided with a pair of embossed rolls provided so as to face each other, and a paper blank is passed between the pair of embossed rolls, and a plurality of blanks are formed on the surface of the blank. It can be manufactured by embossing in which convex portions are regularly and repeatedly formed.
A stamp is formed on the surface of both embossed rolls in the manufacturing apparatus. One embossed roll stamp has a protruding portion (convex portion protruding portion) that protrudes outward (in the direction toward the other embossed roll) and has a shape corresponding to a plurality of convex portions 23 constituting the embossed pattern 20. An inwardly dented portion (recessed portion for vertical line groove) having a shape corresponding to the vertical line groove 21 of the embossed pattern 20 extending in the vertical direction so as to partition the protruding portion for the convex portion in the left-right direction. The embossed roll of the other embossed roll has a shape obtained by reversing the uneven shape of the embossed roll formed on the surface of the one embossed roll. That is, both embossed rolls are supposed to have male and female stamps on each other.
Specifically, the uneven shape of one of the embossed rolls is sandwiched between a groove-shaped vertical line groove recess corresponding to the vertical line groove 21 extending in one direction (vertical direction) and the vertical line groove recess. It consists of a wide band-shaped portion extending in one direction (longitudinal direction), and the wide band-shaped portion corresponds to a protrusion for a convex portion corresponding to a substantially rectangular convex portion 23 in a plan view and a horizontal line groove 22. Groove-shaped flat surfaces are alternately formed. The uneven shape of the other embossed roll is sandwiched between a bank-shaped protrusion (protruding portion for the vertical line groove) corresponding to the vertical line groove 21 extending in one direction (vertical direction) and the protruding portion for the vertical line groove. It consists of a wide band-shaped portion extending in one direction (vertical direction), and in the wide band-shaped portion, a recessed portion (recessed portion for the convex portion) corresponding to a substantially rectangular convex portion 23 in a plan view and a horizontal line groove 22. The groove-shaped flat surface portions corresponding to the above are alternately formed.

The container paper sheet 10 is manufactured using the manufacturing apparatus as described above as follows.
That is, a pair of blanks trimmed into a fan shape are in a state where the vertical direction of the blank coincides with the traveling direction, starting from the point that becomes the midpoint P of the great circle-shaped portion 11 when the sheet 10 is made of container paper. Passed between the embossed rolls. At this time, one embossed roll is passed in contact with the back surface of the blank. Then, the protruding portion (protruding portion for the convex portion) of one embossed roll presses the blank from the back surface side toward the front surface side to form the convex portion 23, and at the same time, the embossed roll of the other embossed roll protrudes like a bank. The vertical line groove 21 is formed by the portion (protruding portion for the vertical line groove) pressing the blank from the front surface side to the back surface side, and is sandwiched between the remaining flat portions of the wide portion of the embossed roll. The portion of the blank becomes a horizontal line groove 22 without being pressed relatively on the front surface side or the back surface side, whereby the uneven pattern of the embossed roll stamp is transferred to the blank.
The trimming of the container paper sheet 10 into a fan shape may be performed before the embossed pattern 20 is formed, or may be performed after the embossed pattern 20 is formed.

According to the method for manufacturing a sheet made of container paper and the apparatus for manufacturing a sheet made of container paper of the present invention, the embossed pattern 20 in which a plurality of convex portions 23 are formed in a cell partitioned by a horizontal line groove 22 and a vertical line groove 21. In the above, it is easy to form a shape in which the vertices of the plurality of convex portions 23 are positioned at a level higher than the bottom of the horizontal line groove 22 and the bottom of the vertical line groove 21 is located at a level lower than the bottom of the horizontal line groove 22. Can be formed into. That is, the container paper sheet 10 in which the above-mentioned wrinkles are suppressed can be easily manufactured at high speed.

Hereinafter, specific examples of the present invention will be described, but the present invention is not limited thereto.
<Example A1>
The width of the vertical line groove 21 is 2.0 mm, the width of the horizontal line groove 22 is 1.0 mm, the top of the convex portion 23 is a rectangle of 5 mm × 10 mm, the angle of the side wall portion of the convex portion 23 is 20 °, and a plurality of horizontal lines. The grooves 22 are arranged in a straight line, and the convex portions 23 are arranged vertically and horizontally. The height (h) from the bottom of the horizontal line groove 22 at the apex of the convex portion 23 and the bottom of the horizontal line groove 22 of the vertical line groove 21. Using a nested mold produced by a 3D printer, the depth (d) from (d) is as shown in Table 1, and a blank made of paper with a basis weight of 200 g / m ² is embossed to form an embossed pattern. A sheet made of container paper [A1] was produced.

<Comparative Examples A2-A4>
In Example A1, the height (h) of the apex of the convex portion 23 from the bottom of the horizontal line groove 22 and the depth (d) of the vertical line groove 21 from the bottom of the horizontal line groove 22 are as shown in Table 1. Embossed patterns were formed in the same manner except that the nesting molds having the same depth were used, and container paper sheets [A2] to [A4] were prepared, respectively.

With respect to the container paper sheets [A1] to [A4], whether or not wrinkles were generated was visually confirmed according to the following evaluation criteria. The results are shown in Table 1.
-Evaluation criteria-
A: No wrinkles B: Slight wrinkles C: Clear wrinkles

As is clear from Table 1, it was confirmed that the occurrence of wrinkles was prevented by having the vertical line grooves 21 and the horizontal line grooves 22 having different depths. Further, it was found that the effect of suppressing the occurrence of wrinkles was small only by lowering the height of the convex portion 23.

<Example B1>
The width of the vertical line groove is 2.0 mm, the width of the horizontal line groove is 2.0 mm, the top of the convex portion 23 is a square of 10 mm × 10 mm, the angle of the side wall portion of the convex portion 23 is 20 °, and a plurality of horizontal line grooves 22. Are arranged in a straight line, and the convex portions 23 are arranged vertically and horizontally, and the height (h) from the bottom of the horizontal line groove 22 at the apex of the convex portion 23 and the height (h) from the bottom of the horizontal line groove 22 of the vertical line groove 21. Using a nested mold produced by a 3D printer with a depth (d) as shown in Table 1, a blank made of paper with a basis weight of 200 g / m ² is embossed to form an embossed pattern, and the container paper is formed. A sheet [B1] was produced.

<Comparative Example B2>
In Example B1, the height (h) of the apex of the convex portion 23 from the bottom of the horizontal line groove 22 and the depth (d) of the vertical line groove 21 from the bottom of the horizontal line groove 22 are as shown in Table 2. An embossed pattern was formed in the same manner except that a nesting mold having the same depth was used, and a container paper sheet [B2] was produced.

<Example C1>
The width of the vertical line groove is 2.0 mm, the width of the horizontal line groove is 2.0 mm, the top of the convex portion 23 is a square of 10 mm × 10 mm, the angle of the side wall portion of the convex portion 23 is 20 °, and the adjacent horizontal line groove 22. Are arranged half-pitch-shifted from each other as shown in FIG. 4, and therefore the convex portions 23 are also arranged in a staggered pattern with a half-pitch shift, and the height (h) from the bottom of the horizontal line groove 22 at the apex of the convex portion 23. And the depth (d) from the bottom of the horizontal line groove 22 of the vertical line groove 21 is as shown in Table 1, using a nesting mold manufactured by a 3D printer, and using paper having a basis weight of 200 g / m ² . The blank was embossed to form an embossed pattern, and a container paper sheet [C1] was produced.

<Comparative Example C2>
In Example C1, the height (h) of the apex of the convex portion 23 from the bottom of the horizontal line groove 22 and the depth (d) of the vertical line groove 21 from the bottom of the horizontal line groove 22 are as shown in Table 2. An embossed pattern was formed in the same manner except that a nesting mold having the same depth was used, and a container paper sheet [C2] was produced.

It was visually confirmed whether or not wrinkles were generated in the container paper sheets [B1], [B2], [C1], and [C2] according to the above evaluation criteria. The results are shown in Table 2.

As is clear from Table 2, even when the plurality of convex portions 23 are arranged in a staggered manner as in the case where the plurality of convex portions 23 are arranged vertically and horizontally, the vertical line grooves 21 and the horizontal line grooves 22 having different depths are provided. , It was confirmed that the occurrence of wrinkles was prevented.

Although the method for manufacturing the container paper sheet, the container and the container paper sheet, and the container paper sheet manufacturing apparatus according to the embodiment of the present invention have been described above, the present invention is not limited to the above embodiment. Various changes can be made without.
For example, the embossed pattern 20 of the container paper sheet 10 is not limited to a pattern in which the convex portions 23 are arranged in a grid pattern or a staggered pattern in a plan view as long as the pattern has vertical line grooves and horizontal line grooves.
Further, for example, the container paper sheet 10 is not limited to having a fan shape as an outer contour shape, and may have a square shape, a rectangular shape, or any other shape.
Further, for example, the container may be a cup-shaped container having an open upper portion including a body portion and a bottom portion, and the body portion itself may be formed of the container paper sheet 10 described above.

10 Container paper sheet 11 Great circle-shaped part 12 Small arc-shaped part 13, 14 Straight part 20 Embossed pattern 21 Vertical line groove 22 Horizontal line groove 23 Convex part 31 Vertical line groove 32 Horizontal line groove 33 Convex part

Claims (8)

An embossed container paper sheet in which multiple protrusions are regularly and repeatedly formed on the surface.
A horizontal line groove extending in the left-right direction so as to partition the plurality of protrusions in the up-down direction,
It has a vertical line groove extending in the vertical direction so as to partition the plurality of convex portions in the left-right direction.
The vertices of the plurality of protrusions are located at a level higher than the bottom of the horizontal line groove, and the bottom of the vertical line groove is located at a level lower than the bottom of the horizontal line groove.
The ratio (d / h) of the height (h) of the apex of the convex portion from the bottom of the horizontal line groove to the depth (d) of the vertical line groove from the bottom of the horizontal line groove is 0. .A sheet made of container paper, characterized by being 8 to 1.3 . The first aspect of the present invention is characterized in that the height from the bottom of the horizontal line groove to the vertices of the plurality of convex portions and the depth from the bottom of the horizontal line groove to the bottom of the vertical line groove are the same. Container paper sheet. The container paper sheet according to claim 1 or 2, wherein the container paper sheet has a fan shape, and the vertical line groove extends radially around a key position of the fan. The container paper sheet according to any one of claims 1 to 3, wherein the vertical line groove is linear. A container consisting of a cup body having an open upper portion consisting of a body portion and a bottom portion that closes the lower portion of the body portion, and a container paper sheet wound so as to cover the outer peripheral surface of the body portion.
A container characterized in that the container paper sheet is made of the container paper sheet according to any one of claims 1 to 4. A cup-shaped container with an open top consisting of a torso and a bottom that closes the lower part of the torso.
A container characterized in that the body portion is formed from the container paper sheet according to any one of claims 1 to 4. Any of claims 1 to 4 by passing a paper blank between a pair of embossing rolls facing each other and embossing the surface of the blank so that a plurality of convex portions are regularly and repeatedly formed. It is a method of manufacturing a container paper sheet for manufacturing the container paper sheet described in the above.
A stamp formed on the surface of one of the embossed rolls has a protruding portion that protrudes outward so as to correspond to the plurality of convex portions, and a vertical extending portion that extends in the vertical direction so as to partition the protruding portion in the left-right direction. It has an inwardly recessed portion corresponding to the line groove, and the stamp formed on the surface of the other embossed roll inverts the uneven shape of the stamp formed on the surface of the one embossed roll. A method for manufacturing a sheet made of container paper, which is characterized by having an embossed shape. Claims are made by providing a pair of facing embossing rolls, passing a paper blank between the pair of embossing rolls, and embossing the surface of the blank so that a plurality of convex portions are regularly and repeatedly formed. A device for manufacturing a container paper sheet for manufacturing the container paper sheet according to any one of items 1 to 4.
A stamp formed on the surface of one of the embossed rolls has a protruding portion that protrudes outward so as to correspond to the plurality of convex portions, and a vertical extending portion that extends in the vertical direction so as to partition the protruding portion in the left-right direction. It has an inwardly recessed portion corresponding to the line groove, and the stamp formed on the surface of the other embossed roll inverts the uneven shape of the stamp formed on the surface of the one embossed roll. An apparatus for manufacturing a sheet made of container paper, which is characterized by having an embossed shape.

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