WO2016139762A1 - Paper cup, and manufacturing method and manufacturing device therefor - Google Patents

Abstract

[Problem] The present invention pertains to the following: a manufacturing method and a manufacturing device for a paper cup in which a pair of embossing rolls form opposing embossments in a middle section of the paper cup or an outer sleeve which is wrapped around the outer circumference of the middle section; and the improvement of the paper cup. [Solution] Each of dies formed on the surface of a pair of embossing rolls has substantially an identical shape and is provided with the following: a frame section that is formed of a flat surface and that partitions cells which are surrounded by lattice frames extending at regular intervals in the horizontal and vertical directions and mutually crossing; and a projection section that includes four lateral-wall surfaces that raise up from the four directions of the sides of a cell towards the center of the cell, and a peak section formed in a plane or linear shape by assembled distal ends of the lateral-wall surfaces. A pair of the dies are characterized in that: the projection sections of the dies are disposed in a direction of approaching a blank; the vertical and horizontal lengths of a quadrangular shape of a unit section are each set as one pitch, the unit section including a cell, frame sections of two sides respectively extending along the adjacent vertical and horizontal side of the cell, and an intersection of these two frame sections; and one die of the pair is offset by half the pitch in the horizontal and vertical directions with respect to the other die.

Description

Paper cup, manufacturing method and manufacturing apparatus thereof

The present invention relates to a paper cup formed by winding an embossed outer sleeve around the outer circumference of an inner cup, a manufacturing method thereof, and a manufacturing apparatus.

Conventionally, a paper cup called a paper cup or a paper cup has been used. This paper cup is known to contain not only cold and hot drinking water but also hot drinking water, etc., and heat treated so that the outer periphery of the paper cup can be safely grasped with fingers. It has been.
As an example, the heat insulating paper cup described in Patent Document 1 has a configuration in which a paper heat insulating sheet in which convex portions and concave portions are alternately arranged is wound around the outer periphery of the paper cup side wall portion.
According to such a heat insulating paper cup, since the heat of the hot contents is not directly transmitted to the outer periphery of the cup by the convex portion and the concave portion formed on the heat insulating sheet, the outer periphery of the cup can be easily grasped with fingers. It becomes possible.
And, in order to enhance the heat insulation effect, the convex portion can be raised and the heat insulation effect can be enhanced by concentrating the convex portions, but in the embossing using a pressing die, the convex portion can be increased, When the convex portions are arranged densely, the blank of the heat insulating sheet is strongly pressed by the pressing die, so that there is a risk of causing cracks or breakage.
Further, not only for heat insulation, the same problem was found in the embossed sheet with unevenness.
That is, conventionally, press processing or roll processing using a pressing die composed of male and female dies has been used, but in the former press processing, it is not possible to weave the blanks in order from the front. Further, even in the roll processing, the upper mold and the lower mold in which the unevenness of the upper mold are reversed, the strong pressure portions are engaged with each other with no margin, and the blank is pulled, so that there is a problem that cutting or wrinkling is likely to occur.

Utility Model Registration No. 2603108

The present invention was devised in view of the above circumstances, and its main problem is that a pair of pressing dies formed on the surfaces of a pair of embossing rolls facing each other are arranged so that the convex portions face each other in substantially the same shape. In addition, the pair of pressing dies are arranged with a half-pitch shift in the vertical and horizontal directions, and the blank passing between the pair of embossing rolls is embossed, so that the blank does not crack or damage. An object of the present invention is to provide a paper cup manufacturing method, a manufacturing apparatus, and a paper cup capable of forming an emboss with a raised portion and a convex portion densely formed.

In order to solve the above problem, the invention of claim 1
In the manufacturing method of the paper cup formed by forming a pair of embossing rolls on the body sleeve of the paper cup, or on the blank of the outer sleeve wound around the outer periphery of the body portion,
Each pressing die formed on the surface of the pair of embossing rolls has substantially the same shape, and extends from the flat surface that partitions each square cell surrounded by a lattice frame that extends in the vertical and horizontal directions at regular intervals. A frame portion, and four side wall surfaces that protrude from the four directions of each side of the cell toward the center side of the cell, and a projection portion that has a surface or a top portion that is formed in a line shape at the tip of the side wall surface. With
While the pressing molds of the pair of embossing rolls are arranged in a direction in which the respective protrusions approach the blank,
One pressing die with the vertical and horizontal lengths of the squares of the unit portion including the cell and two side frame portions extending along the adjacent vertical and horizontal sides of the cell and the intersection of the frame portions as one pitch each The other pressing mold is shifted by half a pitch in the vertical and horizontal directions,
The blank is formed by processing uneven embossing.
In the invention of claim 2,
The tops of the protrusions of the pair of pressing molds face each other in a state of approaching a predetermined intersection of the frame part that is the center of the four protruding parts that are adjacent to each other in the vertical and horizontal directions with the opposing pressing molds,
The four corners of the side walls of each of the protrusions of the pair of pressing molds face each other in close proximity so as to align with the respective corners of the four protruding protrusions of the opposing pressing mold,
The inclined surfaces excluding the four corners of the side wall surface of each of the protrusions of the pair of pressing molds face each other in an inclined state with the opposing pressing mold frame part,
A crossing point where a frame portion between a pair of protrusions adjacent to each other in the vertical or horizontal direction of a pair of push molds overlaps a frame portion between a pair of protrusions adjacent to each other in the horizontal or vertical direction of the opposing push molds Then, the pair of push-type frame portions are opposed to each other in a separated state.
In the invention of claim 3,
The tops of the protrusions of the pair of pressing dies are set to have a lateral width within the lateral width of the frame part facing the tops with the opposing pressing dies.
In the invention of claim 5,
In the paper cup manufacturing apparatus for forming the embossing with a pair of embossing rolls facing the body sleeve of the paper cup, or the blank of the outer sleeve wound around the outer periphery of the body portion,
Each pressing die formed on the surface of the pair of embossing rolls has substantially the same shape, and extends from the flat surface that partitions each square cell surrounded by a lattice frame that extends in the vertical and horizontal directions at regular intervals. A frame portion, and four side wall surfaces that protrude from the four directions of each side of the cell toward the center side of the cell, and a projection portion that has a surface or a top portion that is formed in a line shape at the tip of the side wall surface. With
While the pressing molds of the pair of embossing rolls are arranged in a direction in which the respective protrusions approach the blank,
One pressing die with the vertical and horizontal lengths of the squares of the unit portion including the cell and two side frame portions extending along the adjacent vertical and horizontal sides of the cell and the intersection of the frame portions as one pitch each The other pressing mold is shifted by half a pitch in the vertical and horizontal directions,
An uneven emboss is processed on the blank.
Furthermore, in the invention of claim 7,
In the paper cup formed by a pair of embossing rolls facing the embossment on the blank of the barrel of the paper cup, or the outer sleeve blank wound around the outer periphery of the barrel,
A blank section for partitioning each quadrangular cell surrounded by a grid frame extending in the vertical and horizontal directions at regular intervals on the surface of the blank, and blanking from the four directions of each side of the cell toward the center side of the cell A convex portion having a side wall surface protruding from one side of the surface and a surface gathered at the tip of the side wall surface or a linearly formed top portion,
On the back side of the blank, each rectangular cell surrounded by a lattice frame extending in the vertical and horizontal directions and intersecting at the same regular intervals as the front surface of the blank is partitioned, and a half pitch is formed in the vertical and horizontal directions of the frame portion on the front surface. A frame portion formed in a shifted manner, a side wall surface that protrudes from the back surface of the blank toward the center side of the cell from the four directions of each side of the cell toward the other side, and a surface or a line shape that gathers at the front end of the side wall surface And a concave portion viewed from the surface of the blank is formed by being shifted by a half pitch in the vertical direction and the horizontal direction of the convex portion of the surface, and the side wall surface of the convex portion and the concave portion of the concave portion are formed. The side wall surface is composed of inclined surfaces that coincide at least at four corners.
Here, the paper cup is used in a broad sense including a paper cup and a cup-shaped paper container, and includes those obtained by laminating films of various materials on a base paper.

The paper cup manufacturing method, the manufacturing apparatus, and the paper cup of the present invention are a pair of press molds having substantially the same shape, with their protrusions facing each other and shifted by a half pitch in the vertical and horizontal directions. The embossing roll increases the height of the convex portion of the embossing by strongly pressing the front side and the back side to the blank for forming the body sleeve of the paper cup or the outer sleeve wound around the outer periphery of the body portion, and Embossing that can increase the density of convex portions can be formed without cracking or damaging the blank.

It is the front view which abbreviate | omitted illustration of the embossment of a part of paper cups. It is a front view which shows an example of an embossing roll. It is a side view of a pair of embossing rolls. It is a fragmentary sectional view of a pair of push type which forms embossing, Comprising: It is a fragmentary sectional view for blank upper part sides. It is a fragmentary sectional view of a pair of push type which forms embossing, Comprising: It is a fragmentary sectional view for blank lower sides. It is the expanded view which looked at the pressing die from the front. It is a front view which shows a part of protrusion part and frame part of the upper and lower sides of a pressing die. It is explanatory drawing seen from the plane which shows a part of press die embossed on the upper part of a blank. It is explanatory drawing which shows the state at the time of the strong pressure of a pair of push type | mold. It is a figure explaining the positional relationship of a pair of push type | mold which the hatching of Fig.8 (a) shows. It is explanatory drawing seen from the plane which shows a part of one pressing die embossed in the lower part of a blank. It is explanatory drawing seen from the plane which shows a part of other pressing die embossed in the lower part of a blank. It is explanatory drawing which shows the state at the time of the strong pressure of a pair of push type | mold of FIG. 9 by hatching. FIG. 9 is an end view taken along line xx of FIG. FIG. 9 is an end view taken along line yy of FIG. FIG. 9 is an end view taken along the line zz in FIG. FIG. 11 is an explanatory diagram in which a portion (straight line) that is sandwiched between a pair of pressing dies at the position of FIG. 11A and a portion that is not sandwiched are arranged in the horizontal axis direction, and the vertical axis direction is the flow direction of the embossing roll. is there.

FIG. 1 is a side view of a paper cup of the present embodiment, where 1 is a paper cup, 2 is an inner cup, 3 is an outer sleeve, 4 is a protrusion formed on the outer sleeve 3, and 5 is an outer sleeve 3. It is the recessed part formed.
As shown in FIG. 1, the paper cup 1 of the present embodiment is a known one in which an outer sleeve 3 that is embossed is wound around the outer periphery of the inner cup 2 made of a paper with an inverted frustoconical shape that is open at the top. According to the present invention, the paper cup 1 may not be provided with the outer sleeve 3 and the body portion of the inner cup may be directly embossed.

In this embodiment, the outer sleeve 3 uses a blank B formed in a sector shape, and the outer sleeve 3 has a lattice along the height direction (vertical direction) and the horizontal direction (arc direction) of the paper cup. A convex portion 4 that is regularly surrounded by a plurality of rectangular frame portions 6 and arranged in the vertical and horizontal directions, and a concave portion 5 in which the intersection of the frame portions 6 is the bottom is provided. (Refer to the pressing mold in FIG. 5).

In order to arrange the convex portions 4 in such an outer sleeve shape in regular alignment in the vertical direction (vertical direction) and the horizontal direction (horizontal direction) of the paper cup, the paper cup of the outer sleeve 3 is used. It is necessary to set the width of the convex portion 4 and the width of the frame portion 6 arranged on the upper side of the sheet by gradually reducing the width toward the lower side of the paper cup. The vertical width of each convex portion 4 in the column may be the same in the upper and lower sides, or may be arbitrarily long as long as the convex portions 4 are regularly arranged, for example, gradually shortening toward one of the upper and lower sides (for example, downward). That's fine.

Furthermore, if the height at which the protrusions 4 are raised so as to gradually decrease from the top to the bottom of the paper cup, the stacked paper cups can be easily removed one by one from the bottom or top.
In the illustrated example, the lattice-like frame portion 6 is illustrated as a square or rectangle in which the vertical and horizontal intersect at a right angle. However, in the present invention, the frame portion 6 is a quadrangle such as a rhombus that intersects at an angle other than a right angle. May be. Further, the vertical and horizontal arrangement of the convex portions 4 may be inclined obliquely.

Next, an example of the pressing dies K1, K2 for forming the convex portion 4 and the concave portion 5 will be described.
The pressing dies K1 and K2 are formed of the same shape, and are formed on the surfaces of a pair of embossing rollers R1 and R2. In the illustrated example, the pressing dies K1 are an upper die and the pressing dies K2 are lower dies, Although the upper die is pressed against the blank B with a half-pitch delay with respect to the lower die, this may be reversed in the present invention (see FIGS. 2 to 6).
Hereinafter, for convenience of explanation, the same structure with different pressing dies will be described with “′” attached to the same reference numeral on one side.

A part of the pressing die K1 (K2), as shown in FIG. 7, is a belt-shaped frame portion 15a, 15b (15a ′, 15b ′) formed in a lattice frame shape that intersects vertically and horizontally; Four side wall surfaces 12 (12 ′) projecting while being inclined toward the center side of the cell c from each side of each square cell c partitioned by the frame portions 15a and 15b, and at the upper end of the side wall surface 12 It has a protrusion 14 (14 ') with a top 13 (13') formed in a plane or line shape.
Here, the cell c coincides with the outer periphery of the base end of the protrusion 14.

Then, as shown in FIGS. 4 (a) and 4 (b), each of the pressing dies K1 and K2 has a pair of the embossing rolls R1 and R1 so that the top portions 13 and 13 ′ of the projections 14 and 14 ′ face each other with a deviation. Arranged at R2.
4 (a) shows the upper side of the paper cup, and FIG. 4 (b) shows the lower side unevenness, and the lower projections 14 and 14 'are higher than the upper side. The height is low and the lateral width is narrow (see FIG. 6).
Here, the reason why the horizontal width is narrow is that in the present embodiment, the number of upper left and right protrusions and the number of lower left and right protrusions are set to the same number.

The pressing dies K1 and K2 are formed in an L-shaped frame including the rectangular cell c and two sides c1 and c2 adjacent in the vertical and horizontal directions of the cell c, and including an intersection corresponding to the intersection c3 of the two sides. The vertical and horizontal lengths L1 and L2 of the rectangle combined with the portion F (shaded portion in FIG. 7) are each set to one pitch, and the pressing die K2 of the other embossing roll R2 is set to the pressing die K1 of one embossing roll R1. They are shifted in the vertical and horizontal directions at intervals of a half pitch (L1 / 2, L2 / 2) and used for embossing (see FIG. 8).

Thereby, the top part 13 of the protrusion 14 of one pressing die K1 (shown by a thin line in FIG. 8A) is vertically and horizontally adjacent to the opposing pressing die K2 (shown by a thick line in FIG. 8A). The center is surrounded by the four protrusions 14 'and approaches the intersection 15c' of the frame parts 15a 'and 15b' so as to face each other, and the side wall surface 12 of the protrusion 14 of the pair of pressing dies K1. The four corners 12c are arranged so as to approach and face each other as inclined surfaces having substantially the same angle as the adjacent corners 12c ′ of the side wall surfaces 12 ′ of the four projections 14 ′ of the opposed pressing mold K2. (See FIG. 11).

Similarly, the top portion 13 'of the protrusion 14' of the other pressing die K2 is an intersection of the frame portions 15a and 15b located at the center surrounded by the four protruding portions 14 that are adjacent to each other in the vertical and horizontal directions in the opposing pressing die K1. The corner 12c ′ of the side wall surface 12 ′ of the protrusion 14 ′ of the other pressing die K2 is close to and opposed to the side wall surface 12 of the four protrusions 14 of the opposing pressing die K1. The corners 12c are arranged close to each other so as to form an inclined surface having substantially the same angle.
In the case of the illustrated example, the corners 12c and 12c ′ are formed so that the end portions of the adjacent side wall surfaces 12 in one projection portion are in contact with each other, with the ridge line extending from the upper end to the lower end of the two side wall surfaces approximately centered. And 14 'refers to the range where they can overlap each other.
In other words, in the illustrated example, the corner is square or rectangular in plan view, the ridge line is one diagonal line position, and the two surfaces are inclined in the vertical and horizontal directions of the cell c with the ridge line as a boundary. Is included.

As described above, the embossing pattern of the concave portion 5 and the convex portion 4 is processed by pressing the blank B between the embossing rolls R1 and R2 in which the pressing dies K1 and K2 are arranged.
Here, the protrusion 14 of one pressing die K1 forms the protrusion 4 on the surface of the blank B, and the protrusion 14 'of the other pressing die K2 protrudes from the protrusion on the back surface of the blank B, that is, from the blank surface. As a result, the concave portion 5 is formed.

Referring to FIGS. 8 (a) and 8 (b), a portion that is strongly pressed close to and parallel to the crossing portion 15c ′ of the frame portions 15a ′ and 15b ′ facing the top portion 13 of the protrusion portion 14 is as follows. It becomes A part (FIG.8 (b)) in which the top part of the convex part 4 is formed.
On the contrary, the part which is pressed in parallel and strongly pressed by the crossing part 15c of the frame parts 15a and 15b facing the top part 13 'of the projection part 14' becomes the D part where the bottom part of the concave part 5 is formed.

Next, the four corners 12c of the side wall surface 12 of the projecting portion 14 approach substantially parallel so as to be inclined surfaces at substantially the same angle as the adjacent corner portions 12c ′ of the four side wall surfaces 12 ′ of the four projecting portions 14 ′. Thus, the strongly pressed portion becomes the B portion where the corner portion of the side wall surface of the convex portion 4 and the corner portion of the side wall surface of the concave portion 5 are formed at the same time.

An inclined surface extending in the vertical direction and the horizontal direction of the top portion 13 at the central portion of the side wall surface 12 excluding the four corners 12c of the side wall surface 12 of the projection portion 14 becomes a C portion facing the flat frame portion 15b ′.
Similarly, the inclined surface extending in the vertical direction and the horizontal direction of the top portion 13 ′ at the central portion of the side wall surface excluding the four corners 12c ′ of the side wall surface 12 ′ of the protrusion 14 ′ is opposed to the flat frame portion 15b. Part.
The C part and the E part are strongly pressed with one of the inclined surfaces approaching a horizontal flat surface and the other spaced apart from the horizontal surface. Become.

A frame 15a 'sandwiched between the C parts facing each other between the protrusions 14 adjacent in the vertical direction, and a frame sandwiched between the E parts facing each other between the protrusions 14' adjacent in the horizontal direction. The intersection with the portion 15b becomes an F portion that faces the flat frame portion in a separated state.
Similarly, it is a portion of the frame portion 15a sandwiched between the E portions facing each other between the projecting portions 14 'adjacent in the vertical direction, and is sandwiched between the C portions facing each other between the projecting portions 14 adjacent in the lateral direction. Further, the intersecting portion of the frame portion 15b ′ becomes an F portion that faces the flat frame portion in a separated state. The F portion is not strongly pressed because the frame portions are separated at the time of strong pressure, and the corresponding portion of the blank B can be freely deformed.

Since the blank B is embossed from both the front and back sides as described above, the concave and convex portions on the front and back surfaces of the blank B are embossed in a state where they are shifted by a half pitch vertically and horizontally.
At this time, since the blank B was entirely sandwiched between the surfaces in the past, there was no escape space for the paper. However, in this embodiment, the pressing dies K1 and K2 are not sandwiched by the surfaces but are sandwiched by lines. Since there is a part, a part that can be freely deformed is left in the blank B at the time of strong pressure by embossing, and the part can be deformed by being pushed to the load side when forming the convex part and the concave part. An embossing process in which the height difference is ensured and the convex portions are concentrated as much as possible can be formed without cracking or damaging the blank B.

That is, the blank can move freely at both ends of the sandwiched portion with the surface (line) with respect to the axial direction. (See FIGS. 11A and 11D).
At the same time, a pair of pressing dies K1. Next to the portion sandwiched by K2, the embossing rolls R1 and R2 rotate the pushing dies K1 and K2 to push the portion that was not pushed in the previous stage (the blank moves freely).
That is, as shown in FIG. 11 (d), the freely moving locations at both ends of the sandwiched location become locations that are sandwiched next by the rotation of the roll.
As described above, the distribution of the portions pressed by the pressing dies K1 and K2 and the portion not pressed is uniform with respect to the axial direction.
For the above reasons, even if an emboss is formed on the blank, it is difficult to wrinkle and torn.

In the present embodiment, as described above, the width of the protrusions 14 and 14 'and the frame portions 15a and 15a' is reduced in the lower portion when the blank paper cup is mounted, and the protrusions 14 and 14 ' The height is also set low.
An example of the shape of the protrusions 14 and 14 'in such a case is shown in FIGS.
The protrusions 14 and 14 'have side wall surfaces 12 and 12' inclined toward the center from the four sides of the cell c, respectively, and one pair of opposite side wall surfaces is linear with its upper ends gathered. The other pair of opposite side wall surfaces are formed like a ridge shape whose upper ends are gathered at the respective end portions of the top portions 13 and 13 ′.

In this embodiment, since the blank B has a fan shape, the protrusions 14 and 14 ′ (cell c) of the upper and lower pressing dies K 1 and K 2 are from the arc side of the upper width of the blank B to the lower end of the short width. The width gradually decreases from the arc side, that is, from the top to the bottom of the cup body.
Therefore, for convenience of description, if the rows of the cells c are sequentially row 1, row 2, row 3,... In the column direction from top to bottom, the horizontal widths of the cells in each row of the cells c are the same, Therefore, the width of the cell c in the lower row (for example, the cell in row 2) is equal to or shorter than the width of the cell c in the upper row (for example, cell in row 1).
Further, the horizontal width of each cell c of the upper die K1 and the lower die K2 is shifted by a half pitch in the vertical direction, and is delayed from the lower die K2 by the upper die K2. Is the blank B, the width of the cell c in the row 1 of the lower die K2 is the width of the cell c in the row 1 of the upper die K1, and the cell c in the row 2 of the lower die K2. This relationship is repeated sequentially.
The horizontal width of the cell c may be changed for each of the upper and lower rows, or may be changed for each of a plurality of rows.

And the top parts 13 and 13 'of the projections 14 and 14' are linear, and the top parts 13 'and 13 are included in the lateral width of the frame parts 15a and 15a' at the time of pressing, and The top portions 13 and 13 'are arranged so that the main portions are included in the planes of the intersections 15c' and 15c of the frame portion, respectively.
FIG. 10 illustrates a case where the pressing dies K1 and K2 are arranged with a half-pitch shift, and the combination of the pressing dies is illustrated using hatching from the A part to the F part in FIG. 8B.
Since other configurations are the same as those in the above embodiment, the description thereof is omitted.
Even in the case of the projections 14 and 14 'and the vertical and horizontal frame portions 15a, 15b, 15a', and 15b 'in the form of a lattice, as in FIG. 8, one pressing die K1 and the other pressing die K2 Are arranged so as to be shifted by a half pitch in the vertical direction and the horizontal direction, so that the convex part 4 and the concave part 5 according to the structure can be formed below the blank B (see FIG. 8).

Thereby, on the surface of the blank B, a rectangular frame portion 6 for partitioning each rectangular cell c surrounded by a lattice frame extending in the vertical and horizontal directions at regular intervals, and a cell surrounded by the frame portion 6 Side wall surface 4a that protrudes from the surface of blank B toward one side from the four directions of each side of c toward the center side of cell c, and a top portion 4b that is formed in a plane or a line that gathers at the tip of side wall surface 4a The convex part 4 which has is formed.

On the other hand, the back surface of the blank B partitions each square cell c surrounded by a lattice frame extending and intersecting in the vertical and horizontal directions at the same regular intervals as the surface of the blank B, and the vertical of the frame portion 6 on the front surface. Frame portion 6 'formed with a half-pitch shift in the lateral and lateral directions, and side wall surface 6a protruding from the back surface of blank B toward the other side from the four directions of each side of cell c toward the center side of cell c. The surface of the blank B having a surface that gathers at the tip of the side wall surface 6a 'or a concave portion 5b' that is linearly formed and shifted by a half pitch in the vertical and horizontal directions of the convex portion 4 of the surface A concave surface 5 ′ viewed from above is formed, and an inclined surface is formed in which the side wall surface 4a of the convex portion 4 and the side wall surface 5a ′ of the concave portion 5 ′ coincide with each other at least at four corners.
The concave portion 5 ′ is a concave portion when viewed from the front surface of the blank B, but is a convex portion when viewed from the rear surface.

And the central part of the side wall surfaces 4a and 5a 'of the convex part 4 and the concave part 5' and the intersecting portions at regular intervals of the frame parts 6 and 6 'are not directly pressurized, so the embossing is applied. Even if there is a spot where the mark is applied, the blank can be freely moved, and the blank B can be embossed without being cracked or damaged.

In the said Example, although the case where the blank B was sector shape was illustrated, square, a rectangle, and other arbitrary shapes may be sufficient.
Moreover, although the example which embosses on the whole surface of the blank B was shown, the case where it embosses on a part of blank B may be sufficient.
In addition, it goes without saying that various design changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Paper cup 2 Inner cup 3 Outer sleeve 4 Convex part 5 Concave part 6 Frame part (lattice-like frame part)
12, 12 'Side wall surface 13, 13' Top portion 14, 14 'Protruding portion 15a, 15a' Vertical frame portion 15b, 15b 'Horizontal frame portion 15c, 15c' Intersection c cell c1, c2 Adjacent to cell 2 sides c3 Intersection K1, K2 Stamping die R1, R2 Embossing roll

Claims (8)

In the manufacturing method of the paper cup formed by forming a pair of embossing rolls on the body sleeve of the paper cup, or on the blank of the outer sleeve wound around the outer periphery of the body portion,
Each pressing die formed on the surface of the pair of embossing rolls has substantially the same shape, and extends from the flat surface that partitions each square cell surrounded by a lattice frame that extends in the vertical and horizontal directions at regular intervals. A frame portion, and four side wall surfaces that protrude from the four directions of each side of the cell toward the center side of the cell, and a projection portion that has a surface or a top portion that is formed in a line shape at the tip of the side wall surface. With
While the pressing molds of the pair of embossing rolls are arranged in a direction in which the respective protrusions approach the blank,
One pressing die with the vertical and horizontal lengths of the squares of the unit portion including the cell and two side frame portions extending along the adjacent vertical and horizontal sides of the cell and the intersection of the frame portions as one pitch each The other pressing mold is shifted by half a pitch in the vertical and horizontal directions,
A process for producing a paper cup, wherein the blank is processed with uneven embossing. The tops of the protrusions of the pair of pressing molds face each other in a state of approaching a predetermined intersection of the frame part that is the center of the four protruding parts that are adjacent to each other in the vertical and horizontal directions in the opposing pressing molds,
The four corners of the side walls of each of the protrusions of the pair of pressing molds face each other in close proximity so as to align with the respective corners of the four protruding protrusions of the opposing pressing mold,
The inclined surfaces excluding the four corners of the side wall surface of each of the protrusions of the pair of pressing molds face each other in an inclined state with the opposing pressing mold frame part,
A crossing point where a frame portion between a pair of protrusions adjacent to each other in the vertical or horizontal direction of a pair of push molds overlaps a frame portion between a pair of protrusions adjacent to each other in the horizontal or vertical direction of the opposing push molds Then, the paper cup manufacturing method according to claim 1, wherein the pair of push-type frame portions face each other in a separated state. The paper cup according to claim 1 or 2, wherein the top portions of the pair of pressing mold protrusions are set to have a width within a width of a frame portion facing the top portion of the opposing pressing mold. Method. The pair of pressing molds has a width of the vertical frame of the pressing mold that comes into contact with the blank first and a width of the protruding section, and the width of the vertical frame of the pressing mold that comes into contact with the blank after facing the pressing mold and the width of the protruding section. The method for producing a paper cup according to any one of claims 1 to 3, wherein the lateral width is set shorter. In the paper cup manufacturing apparatus for forming the embossing with a pair of embossing rolls facing the body sleeve of the paper cup, or the blank of the outer sleeve wound around the outer periphery of the body portion,
Each pressing die formed on the surface of the pair of embossing rolls has substantially the same shape, and extends from the flat surface that partitions each square cell surrounded by a lattice frame that extends in the vertical and horizontal directions at regular intervals. A frame portion, and four side wall surfaces that protrude from the four directions of each side of the cell toward the center side of the cell, and a projection portion that has a surface or a top portion that is formed in a line shape at the tip of the side wall surface. With
While the pressing molds of the pair of embossing rolls are arranged in a direction in which the respective protrusions approach the blank,
One pressing die with the vertical and horizontal lengths of the squares of the unit portion including the cell and two side frame portions extending along the adjacent vertical and horizontal sides of the cell and the intersection of the frame portions as one pitch each The other pressing mold is shifted by half a pitch in the vertical and horizontal directions,
An apparatus for manufacturing a paper cup, wherein the blank is processed with uneven embossing. An apparatus for manufacturing a paper cup, which is used in the method for manufacturing a paper cup according to any one of claims 1 to 4. In the paper cup formed by a pair of embossing rolls facing the embossment on the blank of the barrel of the paper cup, or the outer sleeve blank wound around the outer periphery of the barrel,
A blank section for partitioning each quadrangular cell surrounded by a lattice frame extending in the vertical and horizontal directions at regular intervals on the surface of the blank, and blanking from the four directions of each side of the cell toward the center side of the cell A convex portion having a side wall surface protruding from one side of the surface and a surface gathered at the tip of the side wall surface or a linearly formed top portion,
On the back side of the blank, each rectangular cell surrounded by a lattice frame extending in the vertical and horizontal directions and intersecting at the same regular intervals as the front surface of the blank is partitioned, and a half pitch is formed in the vertical and horizontal directions of the frame portion on the front surface. A frame portion formed in a shifted manner, a side wall surface that protrudes from the back surface of the blank toward the center side of the cell from the four directions of each side of the cell toward the other side, and a surface or a line shape that gathers at the front end of the side wall surface And a concave portion viewed from the surface of the blank is formed by being shifted by a half pitch in the vertical direction and the horizontal direction of the convex portion of the surface, and the side wall surface of the convex portion and the concave portion of the concave portion are formed. A paper cup characterized in that the side wall surface is composed of inclined surfaces that coincide at least at four corners. A paper cup formed by the paper cup manufacturing method according to any one of claims 1 to 4.

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