JP5870511B2 - Manufacturing apparatus and manufacturing method for flanged paper cup - Google Patents

Description

  The present invention relates to a paper cup manufacturing apparatus and manufacturing method used to form the outer peripheral edge of a paper cup opening in a flange shape.

  2. Description of the Related Art As a packaging container for powdered food products such as instant coffee, a refill packaging container in which contents are simply packaged is known. FIG. 4 is a longitudinal sectional view of such a packaging container 900 disclosed in Patent Document 1. As shown in FIG. The packaging container 900 includes a paper cup 920 having a cylindrical side wall, a funnel part 930, and a seal lid 960. The funnel part 930 is fitted inside the paper cup 920 and joined to the inner surface of the paper cup 920. A flange portion 921 having a flat flange shape is formed on the outer peripheral edge of the opening of the paper cup 920. The inside of the paper cup 920 is filled with the contents 950, and the paper cup 920 is sealed by affixing a seal lid 960 on the top surface of the flange portion 921.

  FIG. 5 is a cross-sectional view of the ultrasonic horn, the receiving jig, and the paper cup 920 showing a method for manufacturing the flange portion 921 in the paper cup 920. As a material for the paper cup 920, a sheet material obtained by laminating paper and a sealant layer such as a thermoplastic film is generally used. The paper cup 920 is formed by winding a sheet material, partially overlapping both side edges and heating and pressing to join, thereby forming a cylindrical side wall, attaching a bottom material serving as a bottom to one opening, and heating In addition, the curling 901 is formed by joining by knurling or the like, and curling the upper edge of the other opening. Then, the paper cup 920 is held by the jig 800, the processing surface 702 of the ultrasonic horn 700 is brought close to the flange receiving portion 801 of the receiving jig 800, and the upper edge of the side wall of the paper cup 920 is ultrasonically moved. When the curling 901 is crushed while being heated using the processing surface 702 of the horn 700, the curling 901 is welded in a deformed state in a flat shape, and a flange portion 921 is formed.

JP 2009-184169 A

  Since the paper cup is formed by winding a sheet material into a cylindrical shape and bonding both side ends, the bonding portion exists in a form in which the sheet materials overlap. That is, this part is considerably thicker than the other parts. Therefore, in the flange portion formed between the ultrasonic horn and the receiving jig, the bonded portion receives a stronger pressure than other portions. For this reason, there is a problem that the energy of ultrasonic waves concentrates on the bonded portion, and the sealant layer and paper of the sheet material are easily burnt. This problem was particularly remarkable when the thickness of the sheet material was 0.33 mm or more.

  Therefore, an object of the present invention is to provide an apparatus and a method for manufacturing a paper cup in which a flat flange portion is formed on the outer peripheral edge of an opening, which is easy and stable to stick a seal lid without scorching the sheet material. That is.

The present invention relates to an apparatus for manufacturing a flanged paper cup, in which the vicinity of the upper edge of a paper cup having a side wall formed by winding and laminating a sheet material containing paper in a cylindrical shape is formed in a flat flange portion surrounding the outside of the paper cup. And having an outer diameter equal to the inner diameter of the opening of the paper cup, a fitting portion that fits inside the side wall of the paper cup, and an annular shape that is connected to the outer peripheral wall of the fitting portion and contacts the opening of the paper cup An ultrasonic horn having a processed surface, a cup receiving portion having an inner diameter equal to the outer diameter of the paper cup, and a side wall of the paper cup being fitted therein, and an annular shape on the upper end surface of the opening of the cup receiving portion A receiving jig having a flange receiving portion, and as the processing surface and the flange receiving portion approach each other, the curling formed in the vicinity of the upper edge of the side wall of the paper cup is pressed and heated to crush it. When a flat flange part is formed and the processing surface and the flange receiving part are arranged facing each other, the clearance formed between the two is the laminated part where the sheet material constituting the side wall is laminated and bonded together It is partly larger in the part. The receiving jig has a recess formed in a portion of the flange receiving portion and at least a portion of the inner wall of the cup receiving portion in the vicinity of the flange receiving portion, and the clearance is partially increased by the recess. . Alternatively, a ventilation hole is formed inward from the opening of the ultrasonic horn. The present invention is also directed to a method for manufacturing a flanged paper cup using such a flanged paper cup manufacturing apparatus .

  ADVANTAGE OF THE INVENTION According to this invention, the apparatus and method which manufacture the paper cup which formed the flat flange part in the outer periphery of the opening part with which the sticking of the seal lid was easy and stable without scorching the sheet material can be provided.

The figure which shows the ultrasonic horn which concerns on one Embodiment of this invention. The figure which shows the receiving jig which concerns on one Embodiment of this invention. The figure which shows the manufacturing method of the paper cup which concerns on one Embodiment of this invention. Figure showing a conventional paper cup The figure which shows the manufacturing method of the conventional paper cup

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a diagram showing an ultrasonic horn 100 according to the present embodiment. 1A and 1B are a cross-sectional view and a bottom view of the ultrasonic horn 100, respectively. The sectional view of FIG. 1A shows a longitudinal section along the line AA ′ of FIG. The ultrasonic horn 100 is made of, for example, aluminum or titanium. The ultrasonic horn 100 includes a fitting portion 102 on the periphery of the opening, and an annular processing surface 101 connected to the outer periphery of the fitting portion 102. A ventilation hole 103 is formed inside the ultrasonic horn 100. FIG. 1C is an enlarged view of a portion surrounded by a dotted line in FIG. The processing surface 101 is a tapered surface whose diameter increases toward the fitting portion 102 side (the lower side in FIG. 1A). In the present embodiment, the angle formed by the processing surface 101 with respect to a plane orthogonal to the central axis of the ultrasonic horn is 15 ° (that is, the taper apex angle of the processing surface 101 is 75 °).

  FIG. 2 is a view showing a receiving jig 200 according to the present embodiment. 2A and 2B are a cross-sectional view and a top (top) view of the receiving jig 200. FIG. The cross-sectional view of FIG. 2A shows a vertical cross section along the line BB ′ of FIG. The receiving jig 200 includes, for example, a cup receiving part 201 made of stainless steel and having a cylindrical inner shape, and an annular flange receiving part 202 connected to the outer periphery of the opening of the cup receiving part 201. Yes. A recess 203 is provided in a part of the flange receiving portion 202 over a length of 12 mm. (C) and (d) in FIG. 2 are enlarged views of portions surrounded by dotted lines in (a) and (b), respectively. The upper end surface of the flange receiving portion 202 is tapered, and the outer peripheral edge is located closer to the bottom of the receiving jig 200 than the inner peripheral edge. In the present embodiment, the angle formed by the flange receiving portion 202 with respect to a plane orthogonal to the central axis of the receiving jig 200 is 17 ° (that is, the taper apex angle of the upper end surface of the flange receiving portion 202 is 73 °). The recessed part 203 is recessed about 0.3 mm from the other part of the flange receiving part 202. As a result, the clearance between the processing surface 101 of the ultrasonic horn 100 and the cup receiving part 201 of the receiving jig 200 is about 0.3 mm greater at the location where the recess 203 is provided than at the location where the recess 203 is not provided. Moreover, you may give a dent about 0.3 mm similarly in the part from the location connected to the recessed part 203 to the bottom face among the inner walls of the cup receiving part 201. FIG.

  Below, the method of forming the flange of a paper cup using these ultrasonic horn 100 and the receiving jig 200 is demonstrated. First, a sheet material is wound, and both side ends are bonded together to form a cylindrical side wall, a bottom material serving as a bottom surface is attached to one opening, and a paper cup 300 is prepared in which curling is formed on the upper edge of the other opening. . That is, the paper cup 300 is manufactured by the same manufacturing method as the conventional paper cup 920, and the curling has the same cross-sectional shape as the curling 901 of the conventional paper cup 920 shown in FIG. The material of the sheet material includes a laminate of LDPE (low density polyethylene) / paper / LDPE / aluminum / adhesive / PET (polyethylene terephthalate) / adhesive / LDPE. In addition, a sealant layer is laminated on paper. If you have done. As described above, the paper cup 300 is attached with the bottom sheet material serving as the bottom surface at the other opening at this time, but may be attached after the flange is formed.

  The thickness of the sheet material was 0.40 mm, and the width of the bonding portion 303 in which the sheet materials were stacked and bonded together was 10 mm. The finished thickness of the flange portion 302 was 1.3 mm at the bonding portion 303 and 1.0 mm at portions other than the bonding portion 303.

  Next, the paper cup 300 is fitted inside the cup receiving part 201 of the receiving jig 200. The inner diameter of the cup receiving part 201 is substantially equal to the outer diameter of the paper cup 300. At this time, the bonding portion 303 of the paper cup 300 performs alignment so as to face the concave portion 203 of the flange receiving portion 202 of the receiving jig 200. The length of 12 mm of the recess 203 is determined in accordance with the width of 10 mm of the bonding portion 303 of the paper cup 300. Further, the depth of 0.3 mm of the concave portion 203 is set in accordance with the difference between the thickness of 1.3 mm of the bonding portion 303 of the flange portion 302 of the paper cup 300 and the thickness of 1.0 mm of portions other than the bonding portion 303. It has been established. Therefore, the length and depth of the recess 203 may be appropriately designed based on the width of the bonding portion 303 of the paper cup 300 and the finished thickness when formed on the flange portion 302.

  Next, the fitting portion 102 of the ultrasonic horn 100 is fitted inside the paper cup 300. The outer diameter of the fitting portion 102 is substantially equal to the inner diameter of the opening of the paper cup 300. A certain pressure is applied to the opening of the paper cup 300 from the processing surface 101 of the ultrasonic horn 100, and the ultrasonic horn 100 is interposed between the processing surface 101 of the ultrasonic horn 100 and the flange receiving portion 202 of the receiving jig 200. Ultrasonic waves are oscillated from an ultrasonic oscillator (not shown) connected to, and the curling of the paper cup 300 is heated from the processed surface 101 of the ultrasonic horn 100. Here, gas is blown from the vent hole 103 of the ultrasonic horn 100 almost simultaneously with the oscillation of the ultrasonic wave. Due to the pressure from the processing surface 101 of the ultrasonic horn 100, the curling is crushed to the finished thickness of the flange portion 302 and deformed into a flat shape. In this state, the sealant layer is melted by heating and is welded in a state where the flat deformation is maintained. Thereby, the flange part 302 of the paper cup 300 is formed. Note that the timing of blowing the gas is not limited substantially at the same time as the ultrasonic oscillation, and may be performed at any time from the ultrasonic oscillation until the paper cup 300 is separated from the ultrasonic horn 100. The effect of blowing gas will be described later.

  FIG. 3 is a longitudinal sectional view schematically showing the ultrasonic horn 100, the receiving jig 200, and the paper cup 300 in this state. As shown in FIG. 3, the bonded portion 303 of the flange portion 302 of the paper cup 300 is accommodated in the concave portion 203 of the flange receiving portion 202 of the receiving jig 200, so that the flange portion 302 has a uniform pressure and pressure over the entire circumference. Due to the heating, the sticking portion 303 is prevented from being burnt. Note that the recess 203 may be provided not on the flange receiving portion 202 of the receiving jig 200 but on the processed surface 101 of the ultrasonic horn 100. However, in this case, the bonded portion 303 of the flange portion 302 of the paper cup 300 accommodated in the recessed portion 203 forms a convex portion on the top surface side of the flange portion 302, so that a seal lid or the like can be attached. May be difficult.

  Further, after the formation of the flange portion 302, the pulling force when the ultrasonic horn 100 is removed from the opening of the paper cup 300 and the flange portion 302 has a certain thickness, so that the flat state is changed to the original curling state. The power to return is working. When the processing surface 101 of the ultrasonic horn and the flange receiving portion 202 of the receiving jig 200 are formed horizontally without providing the above-described inclination, the flange portion 302 warps obliquely upward from the horizontal direction by these forces. As a result, it may be difficult to attach a seal lid or the like to the top surface of the flange portion 302. By providing the above-described inclination on the processing surface 101 of the ultrasonic horn 100 and the flange receiving portion 202 of the receiving jig 200, the top surface of the flange portion 302 is formed horizontally, making it difficult to attach a seal lid or the like. Can be prevented. In this embodiment, the inclination angle of the processing surface 101 of the ultrasonic horn 100 is set to 15 ° and the inclination angle of the flange receiving portion 202 of the receiving jig 200 is set to 17 °. The inclination angle of the flange receiving portion 202 of the receiving jig 200 is in the range of −2 to 5 ° with respect to the inclination angle of the processed surface 101 of the ultrasonic horn 100. A preferable result is obtained when the thickness of the sheet material of the paper cup 300 is 0.38 mm or more.

  Finally, the ultrasonic horn 100 is separated from the receiving jig 200 and the paper cup 300 is taken out. At this time, since the gas is blown from the vent hole, the internal pressure of the paper cup 300 is higher than the external pressure, and the flange portion 302 of the paper cup 300 and the processed surface 101 of the ultrasonic horn 100 are easily separated. . Therefore, an abnormality in the production line due to the paper cup 300 being lifted together with the ultrasonic horn 100 is less likely to occur. Further, since the paper cup 300 is shaken off from the ultrasonic horn 100, it is not necessary to perform another ultrasonic oscillation (afterburst), the production speed can be improved, and an oscillation abnormality caused by overheating of the ultrasonic horn 100 due to the afterburst can be improved. Can be prevented.

  As described above, in the present embodiment, the flange portion 302 of the paper cup 300 can be formed flat while preventing scorching, and the formed paper cup 300 can be easily separated from the ultrasonic horn 100. In this embodiment, the paper cup 300 is a cylindrical straight type, but the present invention is also applicable to a paper cup having a taper type.

INDUSTRIAL APPLICABILITY The present invention is useful for an apparatus and a method for manufacturing a paper cup or the like in which a flat flange portion is formed on the outer peripheral edge of an opening without burning the sheet material.
Useful for.

100, 700 Ultrasonic horn 101, 702 Processing surface 102 Fitting portion 103 Vent hole 200, 800 Receiving jig 201 Cup receiving portion 202, 801 Flange receiving portion 203 Recessed portion 300, 920 Paper cup 302, 921 Flange portion 303 Bonding portion 900 Packaging container 901 Curling 930 Funnel parts 950 Contents 960 Seal lid

Claims (6)

An apparatus for manufacturing a flanged paper cup, in which a flat flange portion is provided on a paper cup having a side wall formed by winding and laminating a sheet material including paper in a cylindrical shape,
An outer diameter equal to the inner diameter of the opening of the paper cup, a fitting portion that fits inside the side wall of the paper cup, and a circle that is connected to the outer peripheral wall of the fitting portion and contacts the opening of the paper cup An ultrasonic horn having an annular processing surface;
A receiver having an inner diameter equal to the outer diameter of the paper cup, in which the side wall of the paper cup fits, and an annular flange receiver on the upper end surface of the opening of the cup receiver. With a jig,
As the processing surface and the flange receiving portion approach each other, a flat flange portion is formed by pressing and heating and crushing curling formed near the upper edge of the side wall of the paper cup,
In the receiving jig, a recess is formed in a part of the flange receiving part and in the vicinity of at least the part of the flange receiving part among the inner walls of the cup receiving part,
The clearance formed between the processing surface and the flange receiving portion when facing each other is a portion where the bonding portion where the sheet material constituting the side wall is stacked and bonded is disposed, An apparatus for manufacturing a flanged paper cup, which is partially enlarged by the recess . An apparatus for manufacturing a flanged paper cup, in which a flat flange portion is provided on a paper cup having a side wall formed by winding and laminating a sheet material including paper in a cylindrical shape,
An outer diameter equal to the inner diameter of the opening of the paper cup, a fitting portion that fits inside the side wall of the paper cup, and a circle that is connected to the outer peripheral wall of the fitting portion and contacts the opening of the paper cup An ultrasonic horn having an annular processing surface;
A receiver having an inner diameter equal to the outer diameter of the paper cup, in which the side wall of the paper cup fits, and an annular flange receiver on the upper end surface of the opening of the cup receiver. With a jig,
As the processing surface and the flange receiving portion approach each other, a flat flange portion is formed by pressing and heating and crushing curling formed near the upper edge of the side wall of the paper cup,
The clearance formed between the processing surface and the flange receiving portion when facing each other is a portion where the bonding portion where the sheet material constituting the side wall is stacked and bonded is disposed, Partly larger ,
An apparatus for manufacturing a flanged paper cup , wherein a vent hole is formed inward from the opening of the ultrasonic horn . The apparatus for manufacturing a flanged paper cup according to claim 1, wherein a vent hole is formed inward from the opening of the ultrasonic horn. The processing surface of the ultrasonic horn is a tapered surface whose diameter is widened toward the receiving jig side,
The flanged paper cup manufacturing apparatus according to any one of claims 1 to 3 , wherein a tapered surface corresponding to the processed surface is provided on an upper end surface of the flange receiving portion of the receiving jig. A method for manufacturing a flanged paper cup using the flanged paper cup manufacturing apparatus according to claim 1 ,
A cylindrical side wall is formed by winding a sheet material and joining the edges on both sides partially, joining the bottom material to one opening of the side wall, and curling the upper edge of the other opening Preparing a paper cup with curling formed thereon,
Wherein by the working surface and the flange receiving portion, and uniformly pressed and heated the entire periphery of the curling process and the including forming a flat flange portion, the manufacturing method of the flanged paper cup. In the step of forming the flange portion, pressing and heating using an ultrasonic horn, blowing gas into the paper cup, and making the internal pressure of the paper cup higher than the external pressure, the paper cup is detached from the ultrasonic horn. The manufacturing method of the paper cup with a flange of Claim 5 which assists.

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