TWI805818B - Paper sheet for container, manufacturing method thereof, manufacturing apparatus and container for paper sheet for container - Google Patents

Abstract

An object of the present invention is to provide a paper sheet for containers capable of suppressing generation of wrinkles while clearly forming a plurality of protrusions during embossing, a method for manufacturing the same, and a paper sheet manufacturing apparatus and container for containers .

The paper sheet 10 for containers of the present invention is embossed on the surface to form a plurality of protrusions 23 regularly and repeatedly; it is provided with horizontal grooves extending in the left and right directions in order to divide the plurality of protrusions 23 in the vertical direction. Groove 22, and vertical groove 21 extending in the vertical direction in order to divide the above-mentioned plurality of protrusions 23 in the left-right direction; wherein, the apex of the above-mentioned plurality of protrusions is located at a position higher than the bottom of the above-mentioned horizontal groove, and the above-mentioned vertical groove The bottom is located at a lower position than the bottom of the above-mentioned transverse groove.

Description

Paper sheet for container, manufacturing method thereof, manufacturing apparatus and container for paper sheet for container

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

It is known to use a cup-shaped paper container (paper cup) which is composed of a cylindrical body and a bottom, and has an open top. It is known that this paper cup is not only cold or hot drinking water, but when containing high-temperature drinking water or the like, heat-insulating treatment is performed in order to allow fingers to safely grasp the outer periphery of the cup.

For example, in the heat-insulating paper cups disclosed in Patent Document 1 and Patent Document 2, in order to impart heat insulation to the paper cup, on the outer peripheral surface of the cup body barrel, a plurality of protrusions are regularly and repeatedly formed by winding. Embossed paper heat insulating sheet. According to this heat-insulating paper cup, the heat of the high-temperature content is not easily transmitted to the outer periphery of the paper cup due to the plurality of protrusions formed on the heat-insulating sheet, so that the paper cup can be easily grasped with fingers. peripheral.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-294218

[Patent Document 2] Japanese Patent Laid-Open No. 2000-43954

The above-mentioned paper heat-insulating sheet can be produced, for example, by passing a base paper sample between a pair of embossing rollers consisting of a male die and a female die that inverts the concave-convex shape of the male die.

However, when the heat-insulating sheet is produced by such a roll process, it is known that wrinkling may occur in the paper sample board depending on the contour shape of the protrusions constituting the embossing pattern, the height of the protrusions, or the arrangement of the protrusions. As a specific example, as shown in Figure 5, when the formed embossing pattern is formed by the longitudinal groove 31 [it is extended towards the up and down direction (y direction in Figure 5) belonging to the advancing direction between the embossing rollers], In the unit divided with the horizontal groove 32 [which extends in the left-right direction perpendicular to the up-down direction (the x direction in FIG. 5 )], when the convex portion 33 is formed, there will be a starting point extending in the left-right direction in the vertical groove 31. Wrinkled bad condition. In this case, under the premise that the paper sample board is clamped by a pair of embossing rollers and pulled and stretched toward the forward direction, as shown in FIG. Any line segment extending in the up and down direction (y direction in Fig. 6) (in Fig. 6, the line segment r1 along the section G of the dotted line g in Fig. 5), since it is concave and convex along the forward direction (y direction in Fig. 6), the ridge line must not On the other hand, the line segment of the corresponding area on the longitudinal groove 31 (in FIG. 6, the line segment r2 along the section H of the dotted line h in FIG. Below the part of 32 and convex part 33, the ridge line is shorter, so it is judged that the paper sample board will be loose. Especially in embossing, when it is desired to increase the height of the convex portion 33 to form clear protrusions and concaves, so as to obtain higher heat insulation, there will be a problem that the higher the height of the convex portion 33, the more clear the wrinkles will be. In addition, if the height of the convex portion 33 is too high, the base paper template will also be damaged.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a paper sheet for containers capable of suppressing the occurrence of wrinkles while clearly forming a plurality of protrusions during embossing, a method for producing the same, and a paper sheet for containers. Manufacturing devices and containers.

The paper sheet for containers of the present invention is a paper sheet for containers whose surface is embossed regularly and repeatedly to form plural protrusions; it has:

A horizontal groove extending in the left-right direction to divide the plurality of protrusions in the up-down direction; and

A longitudinal groove extending in the vertical direction to divide the above-mentioned plurality of protrusions in the left-right direction;

Wherein, the apexes of the plurality of protrusions are located at a higher position than the bottom of the horizontal groove, and the bottom of the vertical groove is located at a lower position than the bottom of the horizontal groove.

The container of the present invention is composed of:

a cup body consisting of a barrel and a bottom closing the lower part of the barrel, and the upper part is open; and

Paper sheets for containers, which are wound in such a way as to cover the outer peripheral surface of the barrel

constitute,

Among them, the above-mentioned paper sheet for containers is composed of the above-mentioned paper sheet for containers.

The manufacturing method of the paper sheet for containers of the present invention is to make the paper sample board pass between a pair of embossing rollers facing each other, and to carry out the embossing process on the surface of the paper sample board to form a plurality of convex parts regularly and repeatedly. This manufacturing method of manufacturing the above-mentioned paper sheet for containers; wherein,

The stamper formed on the surface of one of the embossing rollers has:

a protruding portion protruding outward in a manner corresponding to the plurality of protruding portions described above; and

The recessed portion is recessed inwardly corresponding to the longitudinal groove; and the longitudinal groove extends in the vertical direction according to the state of dividing the above-mentioned protruding portion in the left and right direction;

The stamper formed on the surface of the other embossing roll has a shape inverting the concave-convex shape of the stamper formed on the surface of one of the embossing rolls.

The manufacturing device of the paper sheet for containers of the present invention is equipped with a pair of embossing rollers facing each other, and the paper pattern plate is passed between the pair of embossing rollers, and the surface of the paper pattern plate is regularly repeated to form a plurality of embossing rollers. Embossing of convex parts to manufacture the above-mentioned paper sheet for containers;

The stamper formed on the surface of one of the embossing rollers has:

a protruding portion protruding outward in a manner corresponding to the plurality of protruding portions described above; and

The recessed portion is recessed inwardly corresponding to the longitudinal groove; and the longitudinal groove extends in the vertical direction according to the state of dividing the above-mentioned protruding portion in the left and right direction;

The stamper formed on the surface of the other embossing roll has a shape inverting the concave-convex shape of the stamper formed on the surface of one of the embossing rolls.

In the paper sheet for containers of the present invention, each unit divided by the horizontal groove and the vertical groove is embossed to form a plurality of protrusions, and the apex of the plurality of protrusions is located at a position higher than the bottom of the horizontal groove. , and make the bottom of the longitudinal groove lower than the bottom of the horizontal groove. According to the paper sheet for containers of the present invention having such a structure, during embossing, the occurrence of wrinkles can be suppressed while clearly forming a plurality of protrusions. As a result, a container provided with high-quality design and high heat insulation can be easily provided by using the paper sheet for containers.

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

The manufacturing method of the paper sheet for containers and the manufacturing device of the paper sheet for containers of the present invention are to make the paper sample board pass between a pair of embossing rollers with mutually reversed concave-convex shape dies, and emboss the surface of the paper sample board Processing, the stamper formed on the surface of one of the embossing rollers is equipped with: a protruding part protruding outward in a manner corresponding to a plurality of protruding parts, and a state corresponding to dividing the protruding part in the left and right direction, along the upper and lower sides A concave portion in which a longitudinal groove extending in a direction is sunken inward. Therefore, according to the manufacturing method of the paper sheet for containers and the manufacturing apparatus of the paper sheet for containers, in the embossing pattern formed by dividing the plurality of protrusions by the horizontal grooves and the vertical grooves, the plurality of protrusions can be easily formed. The apex of the shape is located at a higher position than the bottom of the horizontal groove, and the bottom of the vertical groove is located at a lower position than the bottom of the horizontal groove. That is, the paper sheet for containers in which the generation of the above-mentioned wrinkles is suppressed can be manufactured at high speed and easily.

10‧‧‧Paper sheets for containers

11‧‧‧Large arc-shaped part

12‧‧‧Small arc-shaped part

13, 14‧‧‧straight line part

20‧‧‧Embossed pattern

21‧‧‧longitudinal groove

22‧‧‧Transverse groove

23‧‧‧convex part

31‧‧‧longitudinal groove

32‧‧‧Transverse groove

33‧‧‧convex part

Fig. 1 is a plan view for explaining the outline shape of the paper sheet for containers of the present invention.

Fig. 2 is a schematic perspective view illustrating an example of the embossed pattern of the paper sheet for containers of the present invention.

In Fig. 3, (a) is an explanatory cross-sectional view along the cross-section of the dotted line s in Fig. 2; (b) is an explanatory cross-sectional view along the dotted line t of Fig. 2; (c) is a cross-section along the dotted line u of Fig. 2 (d) is a cross-sectional view along the dotted line v in Fig. 2 for illustration.

Fig. 4 is a plan view for explaining another example of the embossed pattern of the paper sheet for containers of the present invention.

Fig. 5 is a schematic perspective view illustrating an embossed pattern of a conventional paper sheet for containers.

In FIG. 6 , (a) is an explanatory cross-sectional view of a cross-section taken along a dotted line g in FIG. 5 ; and (b) is an explanatory cross-sectional view of a cross-section taken along a dotted line h in FIG. 5 .

Hereinafter, the present invention will be described in detail.

〔Paper sheets for containers〕

The paper sheet 10 for containers according to one embodiment of the present invention is used as a sleeve wound around the outer peripheral surface of the cup body with an open top, and a plurality of protrusions are regularly and repeatedly formed on the surface. 23 embossing process to form an embossed pattern 20. The paper sheet 10 for containers may be embossed on the entire surface, or may be embossed on only a part of the surface.

The paper sheet 10 for containers has, for example, a fan-shaped outer contour as shown in FIG. 1 . Specifically, it has a fan shape surrounded by a large arc-shaped portion 11 , a small arc-shaped portion 12 , and linear portions 13 and 14 . The linear parts 13, 14 are formed by connecting the two ends of the above-mentioned two large and small arc-shaped parts 11, 12 with a straight line extending radially around the position of the fan axis.

The embossed pattern 20 formed on the container paper sheet 10 is, as shown in FIG. The extended horizontal groove 22 and the vertical groove 21 extending in the vertical direction so as to divide the plurality of protrusions 23 in the left and right directions are formed in one unit surrounded by the horizontal groove 22 and the vertical groove 21 Among them, one convex portion 23 is arranged.

In addition, in the present invention, the so-called "vertical direction" refers to the paper sheet for fan-shaped containers. In 10, the extension direction (y direction in Fig. 1) of the straight line connected by the midpoint P of the large arc-shaped part 11 and the midpoint Q of the small arc-shaped part 12, and the so-called "left and right direction" refers to up and down The vertical direction of the direction (the x direction in Figure 1).

The vertical groove 21 is, for example, a bottomed groove with a rectangular cross-section, centered on the fan axis of the container paper sheet 10 , extending radially and linearly from the small arc-shaped portion 12 to the large arc-shaped portion 11 . That is, the outer edge of the vertical groove 21 in this embodiment is constituted by a straight line. In addition, the longitudinal groove 21 in another embodiment can also extend in a roughly radial shape with the fan axis as the center, and the outer edge is formed of a curved line.

If the inclination angle of the longitudinal groove 21 to the vertical direction is in the range of -90°~+90°, the tangent line of the outer edge has an inclination angle of more than 0° and less than ±45° in the vertical direction. When the longitudinal groove 21 extends in a meandering manner, no matter where the outer edge is located, as long as the inclination angle of the tangent to the vertical direction is greater than 0° and less than ±45°.

The width of the vertical groove 21 is, for example, 1.0 mm or more, specifically, 1.0 to 10.0 mm. If the width of the longitudinal groove 21 is too small, as described later, when embossing is performed on the base paper sample, the part that should be the convex portion 23 will be strongly pressed by the press mold, which may cause cracks or damage to the paper sample. sex.

The horizontal groove 22 refers to a tangent line of the outer edge forming an inclination angle of more than ±45° and less than ±90° to the vertical direction. When the lateral groove 22 is not linear, the inclination angle of the tangent to the up-down direction may be within the range of ±45° to ±90° regardless of the position of the outer edge.

The transverse grooves 22 extend in an arc shape parallel to the large arc-shaped portion 11 and the small arc-shaped portion 12 , and are formed between all the longitudinal grooves 21 . That is, any two convex portions 23 arranged vertically in succession are divided in the vertical direction while extending from the nth vertical groove 21 to the adjacent n+1th vertical groove 21 .

In the container paper sheet 10 of the present embodiment, the plurality of transverse grooves 22 are arranged on an arc parallel to the large arc-shaped portion 11, that is, the plurality of transverse grooves 22 are arranged on the straight line portion 13. The linear portion 14 is intermittently arranged on the same circular arc except for the portion intersecting with the vertical groove 21 . By disposing the plurality of horizontal grooves 22 in this manner, the protrusions 23 are arranged in a grid pattern in the vertical and horizontal directions when viewed from above. Furthermore, as shown in FIG. 4 , the plurality of lateral grooves 22 may be arranged with a half-pitch in the vertical direction between adjacent lateral grooves 22 in the arc direction. Due to the arrangement of the plurality of transverse grooves 22 in this manner, the protrusions 23 are also staggered by a half pitch, and are arranged in a staggered grid when viewed from above.

The horizontal groove 22 is a bottomed groove with a rectangular cross section, and the width of the horizontal groove 22 is, for example, 1.0 mm or more, specifically 1.0 to 10.0 mm. If the width of the transverse groove 22 is too small, as described later, when embossing is performed on the base paper sample, the part that should be the convex portion 23 will be strongly pressed by the die, which may cause cracks and damage to the paper sample. sex.

The plurality of protrusions 23 constituting the embossed pattern 20 have substantially the same shape, for example, a substantially rectangular peripheral edge (contour) in plan view, and a trapezoidal, rectangular or semicircular cross-section. Specifically, it has an outline composed of four side wall surfaces raised from the four sides of the unit toward the center of the unit, and a surface covering the tops of the four side wall surfaces, and has a substantially rectangular top.

When the protrusion 23 has a trapezoidal cross-section, the angle of the side wall of the container paper sheet 10 facing the vertical direction (z direction in FIG. 2 ) is set to 50° or less, and one example is set to 20°.

Furthermore, in the paper sheet 10 for containers according to one embodiment of the present invention, as shown in FIG. The depth of the bottom is deep. That is, the apex of the protrusion 23 is positioned higher than the bottom of the horizontal groove 22 , and the bottom of the vertical groove 21 is positioned lower than the bottom of the horizontal groove 22 .

The ratio (d/h) of the height (h) from the apex of the protrusion 23 to the bottom of the horizontal groove 22 and the depth (d) of the vertical groove 21 from the bottom of the horizontal groove 22 is, for example, 0.8 to 1.3. When the ratio (d/h) is within this range, it is possible to suppress the wrinkling of the obtained paper sheet 10 for containers, or even if the wrinkling occurs, it is fine and inconspicuous, and as a result, a high-style embossing pattern can be obtained 20. The ratio (d/h) is preferably set to 1.0, that is, the height from the bottom of the horizontal groove 22 to the apex of the protrusion 23 is the same as the depth from the bottom of the horizontal groove 22 to the bottom of the vertical groove 21 . By setting the height from the bottom of the horizontal groove 22 to the apex of the protrusion 23 and the depth from the bottom of the horizontal groove 22 to the bottom of the vertical groove 21 to be the same, it is possible to reliably suppress the wrinkling of the obtained paper sheet 10 for containers, so that High-style embossing patterns 20 can be reliably obtained.

The difference between the maximum height and the minimum height of the embossed pattern 20, that is, the depth d _max between the top of the convex portion 23 and the bottom of the longitudinal groove 21, is set to 0.3-1.5 mm, for example, 0.8 mm in one example.

If the depth of the apex of the convex portion 23 from the bottom of the longitudinal groove 21 is too deep, as will be described later, when embossing is performed on the base paper template, the part that should become the convex portion 23 will be strongly pressed due to the die, and the paper template will be damaged. There is a possibility of cracks and breakage.

The repetition pitch p2 of the protrusions 23 constituting the embossed pattern 20 along the transverse groove 22 is set in the range of 2.0-20.0 mm. The pitch p2 of the convex portion 23 along the transverse groove 22 is set from the end of one convex portion 23 close to the straight line portion 13 of the container paper sheet 10 to the end adjacent to the straight line portion 13 of the convex portion 23 .

Furthermore, the repetition pitch p1 of the protrusions 23 constituting the embossed pattern 20 along the longitudinal groove 21 is set in the range of 2.0-20.0 mm. The pitch p1 of the convex portion 23 along the longitudinal groove 21 is set from the end of one convex portion 23 close to the large arc-shaped portion 11 of the container paper sheet 10 to the adjacent convex portion 23 close to the large arc-shaped portion. to the end of section 11.

If the pitch is too fine, the height of the convex portion 23 cannot be ensured. As a result, the height formed by the convex portion 23 The space between the finished paper sheet 10 for containers and the cup body barrel cannot be sufficiently large, resulting in the possibility that sufficient heat insulation cannot be obtained, and there is a possibility that the pattern of the concave and convex patterns is difficult to be recognized. On the other hand, if the pitch is too thick, the space between the paper sheet 10 for the container formed by the convex portion 23 and the barrel of the cup body becomes too large, causing the convex portion 23 to be easily deformed, resulting in poor rigidity. possibility.

The paper sheet 10 for containers is formed of, for example, a paper material with a basis weight of 150 to 300 g/m ² .

As above-mentioned paper sheet 10 for containers, embossing processing is performed to form a plurality of protrusions 23 in each unit divided by the horizontal groove 22 and the vertical groove 21, and the apexes of the plurality of protrusions 23 are located at the lower edge of the horizontal groove. 22 is at a higher position, and the bottom of the longitudinal groove 21 is at a lower position than the bottom of the horizontal groove 22 . By having such a structure, generation|occurrence|production of a wrinkle can be suppressed, forming the several convex part 23 clearly at the time of embossing.

The container paper sheet 10 having the embossed pattern 20 in which the apex of the plurality of protrusions 23 is higher than the bottom of the horizontal groove 22 and the bottom of the vertical groove 21 is lower than the bottom of the horizontal groove 22 can suppress the vertical The reasons for the wrinkling of the groove 21 are considered to be the following (1) and (2).

(1) As shown in Figure 3 (a) and (b), it is estimated that in the area covering the transverse groove 22 and the convex part 23, any line segment extending in the vertical direction (y direction in Figure 3) (Figure 3 along the section The line segment w1 of S) is compared with the line segment (line segment w2 along the section T in FIG. Sincerely. Specifically, compared with the case where the horizontal grooves and the vertical grooves have the same depth (refer to FIG. 6 ), since the horizontal grooves 22 of the paper sheet 10 for containers of the present invention become shallower, the protrusions 23 and the horizontal surface The length of the ridge line of the line segment w1 of the groove 22 is shortened, and it is presumed that this part can suppress the wrinkling caused by the length difference between the ridge line of the line segment w1 and the ridge line of the line segment w2.

(2) The depth of the longitudinal groove 21 is deeper than that of the transverse groove 22 , in other words, by the longitudinal groove 21 protruding toward the back side, compared with the portion covering the transverse groove 22 and the protrusion 23 , It is presumed that the occurrence of wrinkles can be suppressed by extending the portion of the paper sample board that would become wrinkled due to slack toward the back side when the vertical groove 21 is formed.

〔container〕

A container according to one embodiment of the present invention is composed of a cup body and a sleeve. This sleeve is constituted by the paper sheet 10 for containers described above. The cup system is composed of an inverted conical cylindrical body and a bottom that closes the lower part of the body, and the upper part is open. The sleeve is wound so as to cover the outer peripheral surface of the barrel.

The barrel part of the cup body of the container is formed by winding the fan-shaped base material to form an inverted cone shape. When the upper part forms an opening, for example, the peripheral part of the opening is rolled outward to form a curling part.

The bottom of the cup body of the container is closed by a circular bottom plate. The peripheral portion of the outer periphery of the bottom plate is bent downward to form a peripheral wall portion, which is sandwiched by the lower end portion of the barrel body of the cup body and the folded portion, whereby the bottom of the cup body is closed.

Also, on the outer peripheral surface of the barrel portion of the cup body, the fan-shaped container paper sheet 10 with the embossed pattern 20 formed on the surface is wound in such a way that the convex portion 23 of the embossed pattern 20 faces outward and without gaps. , and one end (straight line portion) 13 of the paper sheet 10 for the fan-shaped container overlaps with the other end (straight line portion) 14, and in this state utilizes an appropriate adhesive to stick and is fixed on the cup body.

In this container, a space is formed between the outer peripheral surface of the cup body and the inside of the convex portion 23 constituting the embossed pattern 20 of the paper sheet 10 for the container, thereby exhibiting thermal insulation.

The base material that constitutes the body of the cup can be used, for example: cup base paper with a basis weight of 150~300g/ ^m2 , polyethylene resin coated on both sides of the cup base paper or one side inside the cup. Paper, resin sheets, etc.

Such containers can be used for various purposes. It can be used, for example, in containers for beverages, flower pots, containers for filling snacks, and other containers for filling various contents.

According to such a container of the present invention, since the sleeve covering the outer peripheral surface of the body is formed of the above-mentioned container paper sheet 10, high thermal insulation and high-quality design can be obtained.

[Manufacturing method and manufacturing apparatus of paper sheet for container]

The above-mentioned paper sheet 10 for containers uses a manufacturing device equipped with a pair of embossing rollers facing each other, and the paper pattern is passed between the pair of embossing rollers, and the surface of the paper pattern is repeated regularly to form a plurality of embossing rollers. It can be manufactured by embossing the convex part.

A stamper is formed on the surface of two embossing rolls of the manufacturing apparatus. The die system of one of the embossing rollers is equipped with: a protrusion (protrusion for the protrusion) and a depression (depression for the longitudinal groove), and the protrusion corresponds to the shape of the plurality of protrusions 23 constituting the embossing pattern 20 toward the The outer edge (toward the direction of the other embossing roller) protrudes; the above-mentioned concave part extends in the up and down direction in the state where the convex part is divided into the left and right direction by the protruding part, corresponding to the shape of the longitudinal groove 21 of the embossing pattern 20. Concave toward the inner side; And, the stamper of another embossing roll has the inverted shape of the concave-convex shape of the stamper formed on the surface of one of the embossing rolls. That is, the two embossing rolls have dies that are male and female dies.

Specifically, the concave-convex shape of one of the embossing rollers is composed of: a groove-like concave portion for the longitudinal groove corresponding to the longitudinal groove 21 extending in one direction (longitudinal direction); A wide strip-shaped portion extending in the vertical direction (longitudinal direction) is formed, and in the wide strip-shaped portion, protrusions for protrusions corresponding to the convex portion 23 in a planar view and a substantially rectangular shape are formed alternately, and corresponding to A groove-shaped flat portion of the lateral groove 22 . The concavo-convex shape of another embossing roll is composed of: a bank-shaped protrusion (protrusion for longitudinal groove) corresponding to the longitudinal groove 21 extending in one direction (longitudinal direction); A wide strip-shaped portion extending in the vertical direction (longitudinal direction) is formed, and in the wide strip-shaped portion, the depressions (concaves for convexes) corresponding to the substantially rectangular convexes 23 in plan view and the depressions corresponding to the transverse grooves are alternately formed. 22 ditch-like planar portion.

The manufacture of the paper sheet 10 for containers performed using the above-mentioned manufacturing apparatus is performed as follows.

That is, the paper sample board trimmed into a fan shape is passed through a pair of embossing plates in a state where the midpoint P of the large arc-shaped portion 11 faces the front when it becomes a paper sheet 10 for containers, and the up and down direction of the paper sample board is consistent with the forward direction. between the rolls. At this time, one of the embossing rollers passes through in a state of touching the back of the paper sample. Then, the paper sample board is pressed from the back toward the surface by the protruding portion (protruding portion for convex portion) of one of the embossing rolls to form the protruding portion 23, and the bank-shaped protruding portion (for longitudinal groove) of the other embossing roll protruding part) presses the paper sample board from the surface to the back to form a longitudinal groove 21, and the rest of the paper sample board part sandwiched by the flat part of the wide part of one of the embossing rolls and the other embossing roll, the opposite surface and The back side is not pressed to form a transverse groove 22, so that the concave-convex patterns of the embossing rollers are transferred to the paper template.

In addition, the operation of trimming the paper sheet 10 for containers 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 manufacturing method of the paper sheet for containers and the manufacturing apparatus of the paper sheet for containers of the present invention, in the embossed pattern 20 formed on the units divided by the plurality of convex parts 23 by the horizontal grooves 22 and the vertical grooves 21 , it is easy to form a plurality of protrusions 23 whose apex is located higher than the bottom of the horizontal groove 22, and the bottom of the vertical groove 21 is located at a lower position than the bottom of the horizontal groove 22 the shape. That is, the container paper sheet 10 in which the occurrence of the above-mentioned wrinkles is suppressed can be manufactured easily at high speed.

[Example]

Hereinafter, specific embodiments of the present invention will be described, however, the present invention is not limited thereto.

<Example A1>

Manufactured by a 3D printer: the width of the longitudinal groove 21 is 2.0mm, the width of the transverse groove 22 is 1.0mm, the top of the convex part 23 is a rectangle of 5mm x 10mm, the angle of the side wall of the convex part 23 is 20°, and the multiple horizontal grooves 22 are in a straight line The height (h) between the top of the convex portion 23 and the bottom of the transverse groove 22, and the depth (d) of the vertical groove 21 from the bottom of the transverse groove 22 are as shown in Table 1. In the insert mold, embossing was performed on a paper sample sheet formed of paper with a basis weight of 200 g/m ² to form an embossed pattern, and a paper sheet for containers [A1] was obtained.

<Comparative examples A2~A4>

In Example A1, except that the height (h) between the apex of the convex portion 23 and the bottom of the transverse groove 22 and the depth (d) of the vertical groove 21 from the bottom of the transverse groove 22 are used, as shown in Table 1, they are set to the same depth. Except for the embossed mold, the rest are uniformly formed with embossing patterns, and the paper sheets [A2] to [A4] for containers are obtained respectively.

With regard to the paper sheets [A1] to [A4] for containers, the presence or absence of wrinkling was visually confirmed according to the following evaluation criteria. The results are shown in Table 1.

-Evaluation criteria-

A: no wrinkle

B: slightly wrinkled

C: Definite wrinkling occurs

From Table 1, it was confirmed that by providing the vertical grooves 21 and the horizontal grooves 22 with different depths, the generation of wrinkles can be prevented. Also, it was found that the effect of suppressing the occurrence of wrinkles is relatively small when only the height of the convex portion 23 is reduced.

<Example B1>

Manufactured by 3D printer: longitudinal groove width 2.0mm, horizontal groove width 2.0mm, the top of the convex part 23 is 10mm×10mm square, the side wall angle of the convex part 23 is 20°, and the multiple horizontal grooves 22 are arranged in a straight line , the convex portion 23 is arranged vertically and horizontally, and the height (h) between the apex of the convex portion 23 and the bottom of the horizontal groove 22, and the depth (d) of the vertical groove 21 from the bottom of the horizontal groove 22 are embedded types as shown in Table 1 A mold was used to emboss a paper sample sheet formed of paper with a basis weight of 200 g/m ² to form an embossed pattern to obtain a paper sheet for containers [B1].

<Comparative Example B2>

In Example B1, except that the height (h) between the apex of the convex portion 23 and the bottom of the transverse groove 22 and the depth (d) of the vertical groove 21 from the bottom of the transverse groove 22 are used, as shown in Table 2, they are set to the same depth of Except for the insert mold, the embossing patterns were formed in the same manner to obtain a paper sheet for containers [B2].

<Example C1>

Manufactured using a 3D printer: the width of the longitudinal groove is 2.0mm, the width of the transverse groove is 2.0mm, the top of the convex part 23 is 10mm x 10mm square, the angle of the side wall of the convex part 23 is 20°, adjacent to the horizontal groove 22 as shown in Figure 4 As shown, the arrangement is staggered by half a pitch from each other, and the convex parts 23 are also staggered by half a pitch to form a staggered grid arrangement, and the height (h) between the top of the convex part 23 and the bottom of the transverse groove 22 is the same as the distance between the longitudinal groove 21 and the transverse groove. The depth (d) of the bottom of the groove 22 is an insert mold as shown in Table 1, embossing is carried out on the paper template formed by the paper with a basis weight of 200g/ ^m2 to form an embossing pattern, and a paper sheet for a container is obtained [ C1].

<Comparative example C2>

In embodiment C1, except that the height (h) between the apex of the convex portion 23 and the bottom of the transverse groove 22 and the depth (d) of the longitudinal groove 21 from the bottom of the transverse groove 22 are used, the same depth is set as shown in Table 2. The embossing pattern was formed in the same manner except for the insert mold of the same type, and a paper sheet for containers [C2] was obtained.

Regarding the paper sheets [B1], [B2], [C1], and [C2] for containers, the presence or absence of wrinkles was visually confirmed according to the above-mentioned evaluation criteria. The results are shown in Table 2.

As can be seen from Table 2, it has been confirmed that regardless of the situation in which the plurality of protrusions 23 are arranged vertically and horizontally, and the situation in which they are also arranged in a staggered lattice, the vertical grooves 21 and the horizontal grooves 22 of different depths can be provided. Prevent wrinkling.

Above, the paper sheet for containers, the method for manufacturing the container and the paper sheet for containers, and the apparatus for manufacturing the paper sheet for containers according to an embodiment of the present invention have been described. However, the present invention is not limited to the above-mentioned embodiment. Various changes are added.

For example, the embossed pattern 20 of the container paper sheet 10 is provided with a pattern of vertical grooves and horizontal grooves, and is not limited to patterns in which the protrusions 23 are arranged in a grid or a staggered grid when viewed from above.

Furthermore, for example, the outer contour shape of the container paper sheet 10 is not limited to a fan shape, and may be a square, a rectangle, or other arbitrary shapes.

Furthermore, for example, the container may also include a barrel and a bottom, and the upper part is an open cup, and the barrel itself may be formed from the paper sheet 10 for the container.

10‧‧‧Paper sheets for containers

20‧‧‧Embossed pattern

21‧‧‧longitudinal groove

22‧‧‧Transverse groove

23‧‧‧convex part

u, v, s, t‧‧‧dotted line

Claims (8)

A paper sheet for containers, the surface of which is embossed to form a plurality of protrusions regularly and repeatedly; it is provided with: a horizontal groove, which divides the plurality of protrusions upward and downward The method extends in the left and right directions; and the longitudinal groove extends in the up and down direction according to the method of dividing the above-mentioned plurality of convex parts in the left and right direction; wherein, the apex of the above-mentioned plurality of convex parts is located higher than the bottom of the above-mentioned horizontal groove and the bottom of the above-mentioned longitudinal groove is located at a lower position than the bottom of the above-mentioned horizontal groove. The ratio (d/h) of the depth (d) of the bottom is 0.8-1.3. The paper sheet for containers according to Claim 1, wherein the height from the bottom of the horizontal groove to the apex of the plurality of protrusions is the same as the depth from the bottom of the horizontal groove to the bottom of the vertical groove. The paper sheet for containers according to claim 1 or 2, wherein the paper sheet for containers is in the shape of a fan, and the longitudinal grooves extend radially around the position of the fan axis. The paper sheet for containers according to claim 1 or 2, wherein the above-mentioned longitudinal grooves are linear. A container is composed of: a cup body, which is composed of a cylindrical body and a bottom that closes the lower part of the cylindrical body, and the upper part is open; Formed by winding; wherein, the paper sheet for containers is composed of the paper sheet for containers in claim 1 or 2. A container, which is a cup-shaped container consisting of a barrel and a bottom that closes the lower part of the barrel, and the upper part is open, wherein the barrel is made of the paper sheet for the container of claim 1 or 2 . A method for manufacturing a paper sheet for a container, by passing the paper template between a pair of facing embossing rollers, and embossing the surface of the paper template to form a plurality of convex parts regularly and repeatedly, thereby A method of manufacturing a paper sheet for containers according to claim 1 or 2; wherein, the stamper formed on the surface of one of the embossing rollers is provided with: protruding parts corresponding to the above-mentioned plurality of convex parts protruding toward the outside in the same way; and the recessed part, which corresponds to the longitudinal groove groove inwardly recessed, and the above-mentioned longitudinal groove extends in the up and down direction according to the state of dividing the above-mentioned protruding part in the left and right direction; on the surface of another embossing roller The formed stamper has a shape inverting the concave-convex shape of the stamper formed on the surface of one of the above-mentioned embossing rollers. A device for manufacturing paper sheets for containers, which is equipped with a pair of facing embossing rollers, so that the paper pattern board passes between the above pair of embossing rollers, and a plurality of embossing patterns are formed by regularly repeating the surface of the paper pattern board. The embossing process of the part, and the manufacturing device of the paper sheet for the container of claim 1 or 2; the stamper formed on the surface of one of the embossing rollers is equipped with: a protruding part, which corresponds to the above-mentioned The plurality of convex parts protrude outward; and the concave part is recessed inwardly corresponding to the longitudinal groove, and the above-mentioned longitudinal groove extends in the vertical direction according to the state of dividing the above-mentioned protruding part in the left and right direction; The stamper formed on the surface of the embossing roll has a shape inverting the concave-convex shape of the stamper formed on the surface of one of the embossing rolls.

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