JP4538926B2 - Paper cup and its manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper cup in which a half cut line is engraved on the periphery of the bottom so that it can be easily crushed after use, and a method for manufacturing the same.
[0002]
[Prior art]
As shown in FIG. 6, the paper cup generally has a cylindrical body member that tapers downward by joining one end of a fan-shaped body paper to the other end and joining them. A body member forming step (a), a bottom member forming step (b) in which a bottom paper punched out in a substantially circular shape from a bottom member roll is squeezed and the outer peripheral edge is erected downward to form a bottom member; The inner surface of the outer peripheral edge of the bottom member is joined to the lower inner surface, and the lower end edge of the body member is bent inward to cover the outer peripheral edge, and joined to the outer surface of the outer peripheral edge of the bottom member. It is manufactured through each step of the leg forming step (c) for forming the leg, and finally the rim portion forming step (d) for winding the upper peripheral edge of the body member outward and forming the lip portion. Yes.
[0003]
As described above, the paper cup is a container having excellent crush resistance because it has an annular leg portion and a lip portion obtained by folding a paperboard or a bottom paper.
Therefore, used paper cups, such as ice cream cups and various bending cups, cannot be easily crushed, and are very bulky.
[0004]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above-mentioned problems relating to the paper cup, and an object thereof is to provide a paper cup that can be easily crushed after use and a method for manufacturing the paper cup.
[0005]
[Means for Solving the Problems]
The invention of claim 1 of the present invention comprises a laminated sheet in which a thermoplastic resin layer is provided on at least one side of a cup base paper, and comprises a body portion and a bottom portion, and has a mouth edge portion whose outer periphery is curled outward. And a paper cup in which an annular leg is formed at the joint between the body and the bottom. The bottom has an inner peripheral edge near the annular leg and is directed from the outside toward the inside at a substantially intermediate portion of the cup base paper. It is a paper cup characterized by being engraved with half-cut lines reaching up to.
[0006]
In this way, the bottom part is formed with a half-cut line that extends from the outside toward the inside of the cup base paper toward the inside edge near the annular leg, so by pressing the bottom of the paper cup The paper cup can be easily crushed as the bottom part comes off. Moreover, the paper cup after crushing becomes small.
[0007]
Also, the invention of claim 2 is a cylinder member forming step in which one end edge of a paperboard is overlapped and joined to the other end edge to form a cylindrical body member, from a bottom member roll into a substantially circular shape. A bottom member forming step of squeezing the punched bottom paper and raising the outer peripheral edge downward to form a bottom member, joining the inner surface of the outer peripheral edge of the bottom member to the lower inner surface of the body member, and further An annular leg forming step of bending the lower end edge of the trunk member inward so as to cover and joining to the outer surface of the outer peripheral edge of the bottom member to form an annular leg, and the upper peripheral edge of the trunk member outward In the manufacturing method of a paper cup in which the steps are performed in this order, in the manufacturing process of the paper cup in which the above steps are processed in this order, immediately after the bottom paper is squeezed into the bottom member On the inside of the outer peripheral edge of the bottom member, from the outside toward the inside Is a process for manufacturing paper cups, characterized in that substantially the half-cut line is provided engraving step of engraving the half-cut line reaching an intermediate portion of.
[0008]
In this way, during the bottom member forming step, the half cut line that reaches the middle part of the cup base paper from the outside to the inside immediately after the bottom paper is squeezed and used as the bottom member. Since the half-cut line engraving process for engraving is provided, the engraving of the half-cut line on the bottom member can be naturally performed during the paper cup manufacturing process.
[0009]
The invention of claim 3 is the paper cup manufacturing method characterized in that the half-cut line engraving step is provided after the bottom member forming step.
[0010]
As described above, since the half cut line engraving step is provided after the bottom member forming step, the bottom member can be easily removed and crushed along the half cut line when the paper cup is discarded after use.
[0011]
According to a fourth aspect of the present invention, there is provided the paper cup manufacturing method, wherein the half-cut line engraving step is provided after the paper cup is formed.
[0012]
And in invention of Claim 4, the said half cut line engraving process is an engraving method by a laser cut, It is a manufacturing method of the paper cup characterized by the above-mentioned.
[0013]
Thus, since the half-cut line engraving step is provided after the paper cup molding, the half-cut line can be engraved in a separate process from the paper cup molding.
[0014]
The invention of claim 6 is characterized in that a paper cup is molded using a roll for a bottom member in which a desired half-cut line that reaches a substantially intermediate portion of a cup base paper is engraved in advance on a surface that becomes the outside of the paper cup. This is a method for manufacturing a paper cup.
[0015]
In this way, paper cup molding is performed using a roll for a bottom member in which a desired half-cut line that reaches a substantially intermediate portion of the cup base paper in advance is formed on the outer surface of the paper cup. Cup molding can be performed simply by attaching a sensor that detects the cut line and takes the timing.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the paper cup of the present invention will be described in detail below based on the drawings.
The paper cup of the present invention is composed of a laminated sheet (3) provided with a thermoplastic resin layer (2) on at least one surface of a cup base paper (1) as shown in FIGS. 1 (a) and 1 (b), for example. A paper cup comprising a portion (11) and a bottom portion (12), and having a mouth edge (13) whose outer periphery is curled outward, and an annular leg (14) is formed at the joint between the body and the bottom And a paper cup (having a half-cut line (h) engraved on the inner periphery of the annular leg portion from the outside toward the inside of the cup base paper (1) at the bottom (12). 1).
[0017]
The laminated sheet (3) used for the paper cup of the present invention has a base paper having a basis weight of about 100 to 500 g / m ² (both the body member forming the body portion (11) and the bottom member forming the bottom portion (12)). 1) A generally known laminated sheet (3) in which a thermoplastic resin layer (2) is formed by applying a polyolefin resin such as a polypropylene resin or a low density polyethylene resin to about 10 to 50 μm on both sides or one side of 1). .
[0018]
The half-cut line (h) engraved from the outer surface to the inner surface of the bottom (12) is a continuous half-cut line, a perforated half-cut line, a continuous half-cut line and a perforated line It is also possible to implement a combination of half-cut lines.
[0019]
Next, the manufacturing method of the paper cup of the present invention will be described focusing on the method of engraving the bottom of the half cut line (h).
[0020]
There are roughly three methods for engraving half-cut lines on the bottom of a paper cup.
That is, the first method is a method of engraving a half-cut line at the same time as the paper cup is formed, and the second method is to engrave the half-cut line after forming the paper cup. The third method is a method of preparing a roll for a bottom member in which a half cut line is engraved in advance and molding a paper cup.
[0021]
For example, in the above-described bottom member forming step (b), as shown in FIG. After forming the bottom member, the bottom member punching process for punching the substantially circular bottom paper from the roll for material, the bottom member squeezing process for squeezing the punched bottom paper and raising the outer peripheral edge downward to form the bottom member, A bottom member in which a half-cut line engraving step in which a half-cut line (22) set inside the drawing punch (21) works to engrave a half-cut line on the bottom member is sequentially performed in a series of flows. It is a method that is performed simultaneously with the aperture.
[0022]
Thus, by incorporating the half cut blade (22) inside the drawing punch (21), the half cut line can be easily engraved simultaneously with the drawing of the bottom member. However, in order not to cut the bottom member completely, it is necessary to put a spring (23) for preventing full cutting into the half-cut blade so that it returns when a force of a certain level or more is applied.
Further, as shown in FIG. 3, after the bottom paper is squeezed to form the bottom member, a half-cut line may be engraved by applying a half-cut blade (22) to the bottom member.
[0023]
For example, as shown in FIGS. 4A and 4B, a method using a half-cut blade or a method using a laser cut is adopted as a method for engraving a half-cut line after forming the second paper cup. it can.
This method has an advantage that it can be processed as a separate process completely independent from the paper cup molding because the half cut line is engraved after the paper cup is molded.
[0024]
For example, as shown in FIG. 5, for example, as shown in FIG. 5, first, a thermoplastic resin is prepared on at least one surface of the cup base paper (1). Desired dimension slightly smaller than the diameter of the bottom of the paper cup, reaching from the surface that is not the surface of the thermoplastic resin layer (2) of the laminated sheet (3) provided with the layer (2) to the approximate middle portion of the cup base paper (1) A roll for a bottom member is prepared in which half-cut lines (h) having a substantially circular shape with a diameter are continuously engraved at regular intervals by a generally known method using a half-cut blade.
[0025]
From this barrel member prepared separately from the roll for the bottom member, cup molding is performed by using a generally known paper cup molding machine, and the base paper is directed from the outside toward the inside at the inner edge near the annular leg at the bottom. This is a paper cup of the present invention in which a substantially circular half-cut line reaching up to a substantially middle portion is engraved.
In this case, it is necessary to check and position the part where the half cut line is engraved with a sensor or the like immediately before punching the bottom sheet from the roll for the bottom member, and punch the bottom sheet so that the half cut line is located at the center of the bottom. There is.
[0026]
【The invention's effect】
As described above, the paper cup of the present invention has a circular half-cut line engraved at the bottom, so that the paper cup can be crushed with a little force (easy disassembly). In addition, there is an advantage that the paper cup after being crushed becomes small (volume reduction).
[Brief description of the drawings]
FIG. 1 shows an embodiment of a paper cup according to the present invention, (a) is a partial cross-sectional explanatory view, and (b) is a plane explanatory view seen from the bottom.
FIG. 2 is a schematic explanatory view showing an example in which an engraving process for engraving a half-cut line at the bottom of a paper cup is performed during the bottom member forming process.
FIG. 3 is a schematic explanatory view showing an example in which an engraving process for engraving a half-cut line at the bottom of a paper cup after forming a bottom member is shown.
FIGS. 4A and 4B are schematic explanatory views showing an example in which a half cut line is engraved after forming a paper cup, FIG. 4A is a method using a half cut blade, and FIG. 4B is a method using a laser cut.
FIG. 5 is a schematic explanatory view showing an example of a bottom member roll in which half-cut lines are engraved in advance.
FIG. 6 is a schematic explanatory view showing an example of a general manufacturing process of a paper cup.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cup base paper 2 ... Thermoplastic resin layer 3 ... Laminated sheet 10 ... Paper cup 11 ... Body 12 ... Bottom 13 ... Mouth edge 14 ... Annular leg 21 ... Drawing punch 22 ... Half-cut blade 23 ... Spring 24 ... Laser h ... Half-cut wire

Claims (6)

Consists of a laminated sheet provided with a thermoplastic resin layer on at least one side of the cup base paper, consisting of a body part and a bottom part, and having a lip part whose outer periphery is curled outwardly, A paper cup in which an annular leg portion is formed, and a half-cut line is formed on the bottom portion so as to reach an approximately middle portion of the cup base paper from the outside toward the inside edge near the annular leg portion. A paper cup characterized by A body member forming step in which one end edge of the body paper is overlapped and joined to the other end edge to form a cylindrical body member;
A bottom member forming step in which the bottom paper punched out in a substantially circular shape from the roll for the bottom member is squeezed and the outer peripheral edge is raised downward to form the bottom member,
The inner surface of the outer peripheral edge of the bottom member is joined to the lower inner surface of the body member, and the lower edge of the body member is bent inward so as to cover the outer peripheral edge, and the outer surface of the outer peripheral edge of the bottom member An annular leg forming step in which an annular leg is formed by bonding to
The rim portion forming step for winding the upper peripheral edge of the body member outward and forming the lip portion,
In the manufacturing method of the paper cup which processes each said process in this order,
Immediately after the bottom paper is squeezed into the bottom member during the bottom member forming step, a half-cut line is formed on the inside of the outer peripheral edge of the bottom member from the outside toward the inside of the cup base paper. A method for producing a paper cup, characterized in that a half-cut line engraving step is provided. The paper cup manufacturing method according to claim 2, wherein the half-cut line engraving step is provided after the bottom member forming step. The paper cup manufacturing method according to claim 2, wherein the half-cut line engraving step is provided after the paper cup is formed. The paper cup manufacturing method according to claim 4, wherein the half-cut line engraving step is an engraving method by laser cutting. A method for producing a paper cup, comprising: forming a paper cup using a bottom member roll in which a desired half-cut line reaching a substantially intermediate portion of a base paper of a cup is preliminarily formed on a surface to be outside of the paper cup.

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