Container forming method and device

Abstract

Provided is a technology for suppressing defects caused when a blank is rolled into a circle and the ends are joined in the forming of a paper container including a paper cup or a paper tube. While the blank is being embossed, one end of the blank is bent toward the center of the container to form a fold line (L). The blank is rolled into a curved surface, one end (2) of the blank is arranged at the bottom, the other end (1) of the blank is arranged at the top, and the one end (2) of the blank and the other end (1) of the blank are joined to form an inverted truncated cone shape or a cylindrical shape.

Description

Technical Field

[0001] The invention relates to a method for forming containers including paper cups and paper tubes. Background Art

[0002] Examples of paper containers include paper cups and paper tubes (see, for example, Fig.11 ). Fig.11 (A) in the figure shows a paper cup. In order to make the inside clear, it is shown semi-transparently. Fig.11 (B) in FIG. 1 shows a composite container including a paper tube.

[0003] The paper cup has a circular bottom and a main body that is erected from the bottom in an inverted truncated cone shape or a cylindrical shape. If necessary, a flange or a cover may be provided on the upper edge of the main body.

[0004] The paper tube is wound around the outer circumference of the paper cup or the resin container body to form a composite container. When the composite container is in the shape of an inverted circular truncated cone, the paper tube is also in the shape of an inverted circular truncated cone.

[0005] That is, the paper cup body and the paper tube have similar shapes. The paper cup body or the paper tube rolls the fan-shaped blank into a circle, arranges one end at the bottom and the other end at the top, and overlaps and joins the two ends (for example, by heat melting) (for example, Patent Document 1).

[0006] There are also paper containers such as paper cups and paper tubes that have been embossed on the surface (e.g., Patent Document 2). Embossing improves the container's retention and thermal insulation. For example, a paper container filled with hot coffee is less likely to transfer heat to the hand and less likely to overflow. The depth of the concave and convex produced by embossing ranges from several hundred micrometers to about 2 mm.

[0007] Patent Document 1: Japanese Patent Application Publication No. 2016-098013

[0008] Patent Document 2: Japanese Utility Model Registration No. 2603108 Summary of the invention

[0009] Recently, the design of paper containers has attracted attention. For example, it is considered to improve the design by combining printing and embossing. As a result, the embossed pattern tends to become complicated.

[0010] On the other hand, if embossing is performed, the rigidity of the paper is improved. If complicated embossing is performed, the rigidity is different, and when the blank is rolled into a circle, there is a position that is easy to roll into a circle and a position that is difficult to roll into a circle, resulting in poor curved surface formation.

[0011] As a result, one end of the blank cannot be arranged on the lower side and the other end of the blank cannot be arranged on the upper side. When the ends of the blank are joined, the ends of the blank may collide with each other, resulting in poor joining.

[0012] The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a technology for suppressing the defects caused when the blank is rolled into a circle and the end portions are joined during the forming of paper containers including paper cups and paper tubes.

[0013] In order to achieve the above object, the present invention provides a method for forming a paper container, wherein the paper container includes a paper cup and / or a paper tube. While a blank is embossed, one end of the blank is bent toward the center of the container, the blank is rolled into a curved surface, one end of the blank is arranged at the bottom, the other end of the blank is arranged at the top, and one end of the blank and the other end of the blank are joined to form an inverted truncated cone shape or a cylindrical shape.

[0014] By forming the fold line according to the present invention, it is easy to arrange the upper end portion above the lower end portion, and the risk of poor joining can be suppressed.

[0015] Preferably, the bending position is located at a position more than 30% away from one end of the blank relative to the width of the joint.

[0016] Thereby, the effect of forming a broken line is surely achieved.

[0017] Preferably, one end of the blank is bent 30 to 90 degrees relative to the surface of the blank.

[0018] Thereby, the effect of forming a broken line is surely achieved.

[0019] Preferably, the embossing process is performed randomly on the blank, and the rigidity of the blank is uneven.

[0020] The problems occurring in the above-mentioned blank can be solved.

[0021] Preferably, the embossing process is performed in the center of the blank, and the rigidity of the blank is uneven.

[0022] The problems occurring in the above-mentioned blank can be solved.

[0023] Preferably, the blank is pre-printed with a design pattern, and the embossing process is performed corresponding to the printing.

[0024] The problems occurring in the above-mentioned blank can be solved.

[0025] In order to achieve the above object, the present invention provides a device for embossing a blank of a paper container including a paper cup and / or a paper tube, comprising a crimper for bending one end of the blank toward the center of the container while embossing the blank.

[0026] The fold line can be formed by a creaser.

[0027] In order to achieve the above object, the present invention provides a method for forming a paper container, wherein the paper container includes a paper cup and / or a paper tube. The basis weight of the blank is 150 to 350 g / m2, one end of the blank is bent toward the center of the container, the blank is rolled into a curved surface, one end of the blank is arranged at the lower side, the other end of the blank is arranged at the upper side, and one end of the blank and the other end of the blank are joined to form an inverted truncated cone shape or a cylindrical shape.

[0028] By forming the fold line according to the present invention, it is possible to solve the problem that occurs in a high-rigidity blank.

[0029] According to the present invention, it is possible to suppress defects that occur when the blank is rolled into a circle and the end portions are joined.

[0030] Furthermore, according to the present invention, the design of the imprint can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is an outline of the molding method of this embodiment.

[0032] Figure 2 This is an overview of the molding device.

[0033] Figure 3 It is the action description (before the action).

[0034] Figure 4 It is the action description (after the action).

[0035] Figure 5 This is a detailed description of the molding method of this embodiment.

[0036] Figure 6 This is a detailed description of the molding method of this embodiment.

[0037] Figure 7 This is a paper container for reference.

[0038] Figure 8 It is a preferred example of a blank.

[0039] Fig. 9 It is a preferred example of a blank.

[0040] Fig.10 This is the molding method of the reference example and the comparative example.

[0041] Fig.11 This is an example of a paper container. DETAILED DESCRIPTION

[0042] ~Summary~

[0043] The paper container of this embodiment includes a paper cup and a paper tube. In addition, it is not limited to a paper container, but can also be a resin container. The main body of the paper cup and the paper tube are formed by a fan-shaped blank.

[0044] A fan-shaped blank is punched out from a pattern paper printed with a design graphic, and the blank is embossed.

[0045] Figure 1 It is a figure which shows the outline of the forming method of this embodiment. Figure 1 (A) is a stereogram. Figure 1 (B) is a top view. During the embossing process, one end 1 of the blank is bent toward the center of the container to form a fold line L.

[0046] The blank is rolled into a circle, one end 1 is arranged at the bottom, the other end 2 is arranged at the top, the joint surfaces are faced, the two ends are overlapped, and the joints are made with a predetermined joint width, thereby forming a paper cup body or a paper tube.

[0047] - Detailed explanation of forming the fold line L -

[0048] Figure 2 This is a diagram showing the overall outline of a forming device. A crimper 10 (bending mechanism) is added to a conventional forming device. The portion to which the crimper 10 is added is shown in a circular frame.

[0049] Figure 3 and Figure 4 It is a diagram for explaining an example of the operation of the crimping tool 10 . Figure 3 is the state diagram before the action, Figure 4 It is the state diagram after the action.

[0050] In order to carry out the embossing process, the blank is arranged on a support table. At this time, one end 1 of the blank extends out from the support table.

[0051] The crimper 10 is composed of a fixed upper portion 11 and a movable lower portion 12. The upper portion 11 of the crimper is located at an upper position closer to the center of the blank than the position where the fold line L is formed. As a result, the blank is clamped between the support table and the upper portion 11 of the crimper. The lower portion 12 of the crimper is located at a lower position closer to the end of the blank than the position where the fold line L is formed. An inclined surface 13 of 30 to 90 degrees (for example, 60 degrees) is provided at a position of the lower portion 12 of the crimper corresponding to the position where the fold line L is formed.

[0052] When the lower portion 12 of the crimper moves upward, a shear force is generated between the lower portion 12 and the upper portion 11 of the crimper, and a fold line L is formed at one end portion 1 of the blank.

[0053] Figure 5 and Figure 6Detailed description of the forming method of this embodiment is shown in the figure. After the stamping process and the bending process of the end portion by the crimper as a series of processes for forming the container are performed, the blank is wound on a core mold, which is an inverted cone-shaped mold with the same shape as the container body. Figure 5 and Figure 6 is a schematic diagram of the blank wound on the core mold.

[0054] The formation position of the fold line L is located at a position that is at least 30% away from one end of the blank relative to the joining width (for example, 3 mm relative to a joining width of 10 mm). If it is less than 30%, the effect of forming the fold line L (described later) is insufficient. Although it can be at least 100% (=joining width), in practice, 100% is the upper limit.

[0055] Due to the fold line L, one end portion 1 of the blank forms an angle of 30 to 90 degrees (for example, 60 degrees) relative to the blank surface. It is preferably 45 degrees or more. In addition, it is preferably 75 degrees or less. This angle corresponds to the angle of the inclined surface 13. However, the paper returns slightly due to its elasticity, so it is smaller than the angle of the inclined surface 13. If it is less than 30 degrees, the effect of forming the fold line L (described later) is not sufficient. If it exceeds 90 degrees, it may become a cause of poor bonding.

[0056] ~Reference example~

[0057] Before describing the preferred examples of the present invention, reference examples will be described. The reference examples are not intended to exclude the molding method of the present invention, and can also be appropriately used in the present invention.

[0058] Figure 7 This is a reference paper cup. The main body of the paper cup is embossed. Figure 7 In the stamping shown in (A), substantially rectangular convex portions are repeatedly formed intermittently in the circumferential direction to form convex portion rows, and a plurality of convex portion rows are formed at substantially equal intervals in the vertical direction (reference example 1). Figure 7 In the stamping shown in (B) in FIG. 1 , grooves continuous in the up-down direction are repeatedly formed intermittently at substantially equal intervals in the circumferential direction (reference example 2).

[0059] In the embossing process of the reference example, the rigidity also varies, and when the blank is rolled into a circle, there are parts that are easy to roll into a circle and parts that are difficult to roll into a circle. On the other hand, since the embossing is regular, it cannot be said that the rigidity is uneven from the perspective of the blank as a whole, and it cannot be said that the formation of the curved surface is significantly hindered. As a result, the possibility of poor bonding is not high.

[0060] ~Better Example~

[0061] Figure 8This is a blank of the paper cup body of the preferred example (preferred example 1). In the blank shown in preferred example 1, the following design pattern is printed: animal characters are irregularly arranged in the roughly four-divided areas, and a plurality of stars of different sizes are irregularly arranged between the animal characters. The embossing process is performed corresponding to the printing.

[0062] Fig. 9 This is a blank of the main body of a paper cup of a preferred example (preferred example 2). In the blank shown in preferred example 2, in the center of an area divided into approximately three equal parts, there are printed characters and graphics for identification, and embossing is performed corresponding to the printing. The identified characters are described in detail. Relatively large characters are written horizontally in the approximate center of the circular figure. Relatively small characters are arranged on the upper and lower sides to form a circle surrounding the large characters in the center. The upper character marking is convex, and the lower character marking is concave. Moreover, embossing is performed on both sides of the area divided into approximately three equal parts, so that grooves that are continuous in the up and down directions are repeatedly formed intermittently and approximately at equal intervals in the circumferential direction.

[0063] Although not shown in the drawings, a case where a random design pattern such as the touch of a tree is expressed by a combination of printing and embossing processing is a preferred application example of the present invention.

[0064] In the embossing process of the preferred example, the rigidity is uneven, and when the blank is rolled into a circle, portions that are easy to roll into a circle and portions that are difficult to roll into a circle are irregularly generated. Due to the irregular embossing, the embossing position is significantly deviated, thereby significantly hindering the formation of the curved surface. As a result, compared with the above-mentioned reference example, the possibility of poor bonding is high. In addition, it is difficult to predict the details of the poor curved surface formation at the design stage. Therefore, the effect of forming the fold line L (described later) is significant.

[0065] In addition, in the preferred example, because the design pattern is printed first, it is necessary to make the embossing position consistent with the printing position, so it is difficult to adjust the rolling position (joining position) to reduce the risk of poor joining. In this regard, in the preferred example, the effect of forming the fold line L (described later) is significant.

[0066] ~Effect 1~

[0067] The effect of forming the fold line L in the present invention will be described by comparison with the comparative example. Before describing the comparative example, the reference example (see above) will be described. Fig.10 (A) is a forming method of a reference example. In the reference example, from the perspective of the blank as a whole, it cannot be said that the rigidity is uneven (no rigidity difference), and it cannot be said that the curved surface formation is significantly hindered. As a result, the possibility of poor bonding is not high.

[0068] Fig.10 (B) is a molding method of a comparative example. Specifically, an example of poor curved surface formation in the preferred example 2 is shown.

[0069] In the preferred example 2, the rigidity of the central portion roughly divided into three equal parts is significantly high, and the circumferential rigidity of the left and right sides roughly divided into three equal parts is lower than the rigidity of the central portion (for example, less than 75%, particularly less than 50%).

[0070] As a result, the blank becomes flat when the curved surface is formed, and it is difficult to arrange the upper end portion 2 above the lower end portion 1, which may cause poor joining.

[0071] On the other hand, even if some defects occur when the curved surface is formed, by forming the fold line L of the present application, it is easy to make the joint surfaces face each other and arrange the upper end 2 above the lower end 1 (see Figure 1 ), which can reduce the risk of poor bonding.

[0072] ~Effect 2~

[0073] In the above preferred example, the design is improved by the combination of printing and embossing. At this time, the consistency of the printing position and the embossing position becomes important. If the printing position and the embossing position deviate, the design is significantly reduced.

[0074] In contrast, the formation of the fold line L in the present application is performed together with the embossing process (see Figure 4 ). When forming the fold line L of the present application, one end 1 of the blank is constrained by the creaser 10. As a result, the blank on the support table will not deviate, the printing position and the embossing processing position are consistent, and the design is clear.

[0075] ~Modification~

[0076] The blanks of the reference examples and preferred examples are pre-stamped. The basis weight of the usual blank is 150 to 350 g / m 2 .

[0077] However, when the basis weight exceeds 200g / m 2 , especially when the basis weight exceeds 250g / m 2 In the case of , the rigidity is significantly high, and the same problem as that of the present application may occur regardless of whether or not the embossing process is performed.

[0078] Even if the rigidity of the blank is high, the same effect as the effect of forming the fold line L in the present application can be obtained.

[0079] Description of Reference Numerals

[0080] 1: End of blank (lower side)

[0081] 2: End of blank (upper side)

[0082] 10: Seam Creasing Machine

[0083] 11: Upper side of the crease

[0084] 12: Underside of the crease

[0085] 13: Inclined surface

[0086] L: Polyline

Claims

1. A method for forming a container, wherein a blank is formed into an inverted truncated cone shape or a cylindrical shape, wherein the container comprises a paper cup and / or a paper tube, and the forming method comprises: While the blank is being embossed, one end of the blank is bent toward the center of the container. Rolling the blank into a curved surface, One end of the blank is arranged at the lower side, and the other end of the blank is arranged at the upper side, Joining one end of the blank with the other end of the blank, The bending position is located at a position which is more than 30% away from one end of the blank relative to the width of the joint, Relative to the surface of the blank, one end of the blank is bent 30 to 90 degrees, The embossing process is performed randomly on the blank, and the rigidity of the blank is uneven. The blank is pre-printed with a design pattern, and the embossing process is performed corresponding to the printing.

2. A method for forming a container, wherein a blank is formed into an inverted truncated cone shape or a cylindrical shape, wherein the container comprises a paper cup and / or a paper tube, and the forming method comprises: While the blank is being embossed, one end of the blank is bent toward the center of the container. Rolling the blank into a curved surface, One end of the blank is arranged at the lower side, and the other end of the blank is arranged at the upper side, Joining one end of the blank with the other end of the blank, The bending position is located at a position which is more than 30% away from one end of the blank relative to the width of the joint, Relative to the surface of the blank, one end of the blank is bent 30 to 90 degrees, The embossing process is performed in the center of the blank, and the rigidity of the blank is uneven. The blank is pre-printed with a design pattern, and the embossing process is performed corresponding to the printing.

3. An apparatus for performing the embossing process of claim 1 or 2, comprising: The crimping device is used to bend one end of the blank toward the center of the container while the blank is being embossed.

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