JP6031772B2 - Packaging container manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a packaging container that can easily transfer contents having fluidity such as powder, granule, and liquid to another container.

  A package described in Patent Document 1 is known as a package capable of easily refilling a powdery or granular content such as instant coffee into a storage container or a tank of a coffee machine. The refill package described in Patent Literature 1 includes a cylindrical container body, a funnel part inserted into an open end portion of the container body, and a membrane that seals the open end of the container body. When using this refill package, place the membrane part into the opening of the refill destination container such as a storage container or tank, and press the refill package toward the refill destination container to break the membrane. The contents can be transferred to the refill destination container along the inner surface of the part.

JP 2010-254326 A

  In recent years, reduction of the amount of resin used for packaging containers has been demanded from the viewpoint of resource saving and ease of disposal. Therefore, in a refill package as described in Patent Document 1, it is desired to use a funnel part molded with a material mainly made of paper instead of a funnel part of a resin molded product.

  However, a method for manufacturing a packaging container having a structure in which a paper funnel part is inserted into a paper cup container has not been proposed yet.

  An object of the present invention is to provide a method for manufacturing a packaging container in which a funnel part made using a paper-based material is joined to a cup-shaped container body made of a paper-based material. And

The present invention relates to a method for manufacturing a packaging container used for packaging contents having fluidity such as powder, granules, and liquids, and transferring the contents to another container. The manufacturing method of the packaging container according to the present invention uses a sheet material including paper and a sealant, and a funnel portion whose diameter narrows from the wide-mouth side to the narrow-mouth side, and the sheet material on the wide-mouth side of the funnel portion is disposed outside the entire circumference. is returned folding, forming and forming a funnel part and a side wall portion surrounding the outer surface of the funnel portion, the cup-shaped container body having an open end cylindrical side wall and the bottom, of the container body Attaching a funnel part to the inside. The process of attaching the funnel part includes the process of heating and softening the sealant on the outer surface of the side wall part, and shrinking the side wall part of the funnel part in the circumferential direction so that the outer diameter of the side wall part becomes smaller than the inner diameter of the open end of the container body. The funnel part is held in a state where the funnel part is held, and the funnel part is inserted into the container body with the wide-mouthed portion facing the bottom of the container body, and the funnel part of the funnel part inserted into the container body. Inserting an expansion member between the vicinity of the side wall and the side wall portion to push the side wall portion outward and crimp the side wall portion to the inner surface of the side wall of the container body. In addition, the manufacturing method of the packaging container according to the present invention uses a sheet material including paper and a sealant, and is connected to the funnel portion having a diameter narrowing from the wide mouth side to the narrow mouth side, and to the wide mouth side portion of the funnel portion. Forming a funnel part having a side wall part surrounding the outer surface of the part, forming a cup-shaped container body having a cylindrical side wall, a bottom part and an open end, and attaching the funnel part to the inside of the container body A process. The process of attaching the funnel part includes the process of heating and softening the sealant on the outer surface of the side wall part, and shrinking the side wall part of the funnel part in the circumferential direction so that the outer diameter of the side wall part becomes smaller than the inner diameter of the open end of the container body. The funnel parts are held in the state where the funnel parts are inserted, the process of inserting the funnel parts into the container body with the wide-mouthed side portion facing the bottom of the container body, and the side walls of the funnel parts inserted into the container body are expanded. A step of crimping the side wall portion to the inner surface of the side wall of the container body. In the step of forming the funnel part, a plurality of concave portions extending in the axial direction of the funnel part are formed in the side wall portion, and the side wall portion is contracted in the circumferential direction. .

  According to the present invention, a funnel part made using a paper-based material can be joined into a cup-shaped container body made of a paper-based material, and the resin usage ratio of the packaging container can be increased. It can be greatly reduced. In addition, the funnel parts are inserted into the container body after the outer diameter of the side wall portion is made smaller than the inner diameter of the container body, so the softened sealant is rubbed to generate resin scraps, or the sealant is scraped and weld strength is increased. It is greatly reduced that the deterioration occurs.

The perspective view of the packaging container which concerns on embodiment Sectional view along the II-II line shown in FIG. 2 is a perspective view of the funnel part shown in FIG. Sectional drawing which shows the use condition of the packaging container which concerns on embodiment The flowchart which shows the manufacturing method of the packaging container which concerns on embodiment The figure for demonstrating the manufacturing process of the funnel part shown in FIG. Drawing for explaining the manufacturing process following FIG. 6A The figure for demonstrating the manufacturing process following FIG. 6B. The figure for demonstrating the manufacturing process following FIG. 6C. Drawing for explaining the manufacturing process following FIG. 6D The figure which shows the state which the fracture | rupture generate | occur | produced at the time of the folding | turning of the narrow edge side edge of an intermediate body Front view showing another example of funnel parts The figure for demonstrating the manufacturing process of the funnel part shown in FIG. The figure for demonstrating the manufacturing process following FIG. 9A. The figure for demonstrating the manufacturing process following FIG. 9B. The figure for demonstrating the manufacturing process following FIG. 9C. Sectional view showing the state of ruled lines before and after drawing Sectional drawing which shows the manufacturing method of the container main body shown in FIG. The figure for demonstrating the manufacturing process following FIG. 11A The figure for demonstrating the manufacturing process following FIG. 11B. The figure for demonstrating the manufacturing process following FIG. 11C Sectional view showing how to attach the funnel part to the container body The figure for demonstrating the manufacturing process following FIG. 12A. The figure for demonstrating the manufacturing process following FIG. 12B. Sectional drawing which follows the XIV-XIV line shown to FIG. 12B Sectional drawing explaining the curvature of the side wall part of a funnel part

<1. Configuration of packaging container>
1 is a perspective view of the packaging container according to the embodiment, FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 1, and FIG. 3 is a perspective view of the funnel part shown in FIG. It is.

  The packaging container 1 wraps powdered, granular, liquid, and other fluid contents such as instant coffee and powdered milk, and toner for copying machines and laser printers. It can be easily transferred to. The packaging container 1 includes a cup-shaped container body 2, a funnel part 3 fitted in the container body 2, and a seal lid 4.

  The container body 2 includes a cylindrical side wall 15 and a bottom portion 16. One end of the cylinder formed by the side wall 15 is closed by the bottom 16 and the other end is open. A flange portion 17 is formed in the open end portion of the container body 2 by curling the edge of the side wall 15 outward and then crushing it flat. The container main body 2 is formed of a material mainly made of paper in consideration of weight reduction of the container, ease of disposal, and resource saving. As an example, a laminated film of paper and resin can be used. When gas barrier properties are required, a gas barrier layer such as a vapor deposition film or an aluminum foil is included in the layer configuration. Details of the manufacturing method of the container body 2 will be described later.

  The funnel part 3 includes a funnel portion 13 having a diameter that narrows from the wide-mouth side opening to the narrow-mouth side opening, and a side wall portion 9 that surrounds the outer surface of the funnel portion 13 and is connected to the wide-mouth side opening of the funnel portion 13. . The funnel part 3 is integrally formed using a material mainly composed of paper. As a material for the funnel part 3, a laminated sheet of paper and polyethylene can be suitably used. Details of the method of manufacturing the funnel part 3 will be described later.

The funnel part 13 is connected to the discharge part 6 constituting the narrow opening part, the first taper part 7 connected to the discharge part 6, and the first taper part 7, and the second part constituting the wide opening part. And a tapered portion 8. Here, the taper angle θ ₁ of the first taper portion 7 is designed to be larger than the taper angle θ ₂ of the second taper portion 8. The discharge part 6 may be formed in a straight shape having a substantially constant diameter, or may be formed in a tapered shape with a taper angle θ ₃ . When the packaging container 1 is opened, a pressing force is applied to the discharge part 6 through the seal lid 4, and therefore the discharge part 6 is straight (ie, the taper angle θ ₃ = 0 °) in order to increase the buckling strength. Ideally set to. However, in order to improve the releasability at the time of molding, the taper angle θ ₃ is preferably set to a value larger than 0 ° and 15 ° or less, and even within this range, it is set to 5 to 10 °. It is more preferable. As the taper angle θ ₃ is increased, the releasability at the time of molding is improved. However, when the taper angle θ ₃ exceeds 15 °, the strength of the discharge part 6 is reduced.

  Further, a folded portion 10 is formed inside the discharge portion 6 by folding a part of the sheet material inward. The folded portion 10 is heat-sealed on the inner surface of the discharge portion 6 and has a function of reinforcing the narrow-side opening of the funnel part 3. The edge of the folded portion 10 is formed in a wave shape. This is for relaxing the tension applied to the sheet material and preventing the breakage of the sheet material when the folded portion 10 is formed by folding the sheet material. Is.

  The side wall portion 9 is a portion for welding the funnel part 3 to the inner peripheral wall of the container body 2. As shown in FIG. 3, a plurality of folds 14 extending in the axial direction of the funnel part 3 are formed in the side wall portion 9 except for the overlapping portion (the range indicated by the arrow) of the sheet material. The folds 14 impart elasticity to the side wall 9. By providing a plurality of ruled lines instead of the pleats 14, embossing, and forming a wavy shape in which the distance from the side wall 9 to the central axis of the funnel part 3 is increased or decreased, the elasticity is imparted. You may do it.

  The funnel part 3 is fixed to the container body 2 by being inserted into the container body 2 with the wide-mouth side opening directed toward the bottom 16 and welding the outer surface of the side wall 9 to the inner peripheral surface of the container body 2. Yes. The attachment position of the funnel part 3 is adjusted so that the end of the discharge part 6 protrudes outward from the plane including the open end of the container body 2. Thus, by making the discharge part 6 of the funnel part 3 protrude from the plane including the open end of the container body, the adhesion between the funnel part 3 and the seal lid 4 is improved, and the narrow side end of the funnel part 3 The contents can be prevented from passing around the outside of the funnel part 3 through the space between the seal lid 4 and the seal lid 4. In addition, the protrusion amount d of the funnel part 3 is set to be larger than 0 mm and 2 mm or less. Even within this range, if the projecting amount d of the opening on the narrow mouth side is 0.5 mm or more and 1.5 mm or less, the funnel part 3 can be easily positioned with respect to the container body 2, and the packaging container 1 can be easily manufactured. It becomes.

  The seal lid 4 includes a lower layer film 18 that is sealed to the flange portion 17 of the container body 2 and an upper layer film 19 that is detachably laminated on the outer surface of the lower layer film 18. The lower layer film 18 is provided with perforations (not shown) in a radial pattern, and is broken by receiving a pressing force from the refill destination container during use. The upper film 19 is provided for protecting perforations formed in the lower film 18 and ensuring the sealing property of the packaging container 1, and is peeled off from the lower film 18 when used. A tab 5 is provided on a part of the outer peripheral edge of the upper layer film 19 so as to be easily held when peeled from the lower layer film 18.

  FIG. 4 is a cross-sectional view showing a usage state of the packaging container according to the embodiment.

  When the packaging container 1 is used, as shown in FIG. 4A, the upper layer film 19 of the seal lid 4 is peeled off, the packaging container 1 is inverted, and the lower layer film 18 of the seal lid 4 is placed in a storage container or a tank. The lower film 18 of the seal lid 4 is placed in the opening of the refill destination container 28. Then, the lower layer film 18 of the seal lid 4 is broken as shown in FIG. 4B by pressing the packaging container toward the refill destination container 28 side. When the lower layer film 18 is broken, the content 12 flows into the refill destination container along the inner surface of the funnel part 3. According to such a packaging container 1, the contents 12 can be easily refilled into the refill destination container without contaminating the operator's hand or work place.

  The funnel part 3 is provided with cushioning properties by providing the first taper portion 7 and the second taper portion 8 having different taper angles. The pressing force applied to the discharge part 6 at the time of opening (FIG. 4 (a)), transportation, etc. is near the boundary between the first taper part 7 and the second taper part 8, and the first taper part 7 and the discharge part 6 Since it is absorbed by elastic deformation with the vicinity of the boundary, buckling deformation of the funnel part 3 can be effectively suppressed.

<2. Manufacturing method of packaging container>
FIG. 5 is a flowchart showing a method for manufacturing the packaging container according to the embodiment.

  The manufacturing method of the packaging container according to the present embodiment includes a step S1 for molding the funnel part 3, a step S2 for molding the container body 2, a step S3 for attaching the funnel part 3 to the container body 2, and the opening of the container body 2. And a step S4 of sealing the end with the seal lid 4. Either the molding step S1 of the funnel part 3 or the molding step S2 of the container body 2 may be performed first. Moreover, the filling of the contents into the packaging container 1 is performed between the attachment process S3 of the funnel part and the sealing process S4 with the seal lid. Details of the manufacturing method will be described below.

<3. Manufacturing method of funnel parts>
6A to 6E are views for explaining a manufacturing process of the funnel part shown in FIG.

  First, a blank material 21 shown in FIG. 6A is produced by punching a sheet material mainly made of paper with a mold. The blank material 21 has a shape in which a part of a sector shape is cut out. More specifically, the blank member 21 includes an arc 25, two straight lines 26a and 26b extending in the radial direction of the arc, an arc concentric with the arc 25 and having a smaller radius than the arc 25 (in FIG. 6A, a two-dot chain line). And a shape surrounded by a wavy line 27 extending along a line (shown virtually). As a material of the blank material 21, for example, a sheet material having a layer configuration of polyethylene / paper / polyethylene can be suitably used.

  Next, a substantially truncated cone-shaped intermediate body 22 shown in FIG. 6B is formed. More specifically, the blank 22 is wound around the frustoconical mandrel, the vicinity of the straight lines 26a and 26b is overlapped, and the overlapping portion is heat-sealed to obtain the intermediate body 22.

  Next, the narrow portion of the intermediate body 22 is folded back to form the intermediate body 23 shown in FIG. 6C. More specifically, first, the inner surface of the narrow opening portion of the intermediate body 22 is heated with hot air or the like to melt the sealant. Next, liquid paraffin is applied to the outer surface of the narrow mouth portion. The liquid paraffin is for improving the sliding property between the folded portion of the intermediate 22 and the mold. Then, the folded portion 10 is formed by folding the narrow opening portion inward with a mold and sealing the folded portion to the inner surface of the tapered portion. Note that, after the narrow portion of the intermediate body 22 is folded, the overlapping portion may be heated and sealed. Here, the liquid paraffin is used for the purpose of preventing breakage of the folded portion of the intermediate body 22 and improving the releasability from the mold or the like, and is preferably applied but may not be applied.

  Next, liquid paraffin is applied to the wide-mouthed portion of the intermediate body 23 and then folded outward to form the intermediate body 24 shown in FIG. 6D. At this time, the side wall 9 is shrunk in the circumferential direction by using a mold having irregularities in the portion corresponding to the side wall 9 to attach a fold 14 to the side wall 9 simultaneously with the formation of the side wall 9. Further, by heating the mold to about 40 ° C., the side wall portion 9 is held in a contracted state, and the folds 14 on the side wall portion 9 are prevented from spreading after molding. Instead of providing the folds 14, the side walls 9 may be stretched by providing ruled lines on the blank material and contracting the ruled line portions. Further, the embossing provides a plurality of recesses extending in the axial direction of the intermediate body 23, or the side wall part 9 is molded such that the distance from the axial center of the intermediate body 23 increases or decreases. You may give elasticity to. Also in this step, the liquid paraffin is used for the purpose of preventing breakage of the folded portion of the intermediate 24 and improving the releasability from the mold or the like, and is preferably applied but may not be applied. .

  Next, the intermediate body 24 is press-molded using a mold heated to about 65 ° C., and the discharge portion 6, the first taper portion 7, and the second taper portion 8 are simultaneously formed as shown in FIG. 6E. . At the time of press molding, a plurality of embosses 11 extending in the axial direction of the funnel part 3 are formed so as to straddle the boundary between the discharge part 6 and the first taper part 7. By providing the emboss 11, it is possible to suppress wrinkles at the boundary between the discharge portion 6 and the first taper portion 7. The discharge portion 6, the first taper portion 7, and the second taper portion 8 may be formed by drawing before the side wall portion 9 is formed.

  Here, the reason why the narrow side edge of the intermediate body 22 is cut into a wave shape will be described.

  FIGS. 7A and 7B are diagrams showing a state in which a breakage occurs when the narrow edge of the intermediate body is folded back, where FIG. 7A is a top view and FIG. 7B is a cross-sectional view.

  In the case of folding back the narrow side portion of the tapered intermediate body, when the taper angle of the intermediate body 22 shown in FIG. 6B is approximately 10 ° or more, the circumferential length of the crease portion and the circumferential length in the vicinity of the edge of the sheet material are The difference becomes larger, and this difference cannot be absorbed by the elongation of the sheet material. Accordingly, during folding, a large tension is generated in the circumferential direction at the edge portion of the folded portion 45, and the folded portion 45 is broken as shown in FIG. 7B. When the folded portion 45 is broken, the broken portion is more likely to be broken than the other portions. Therefore, as shown in FIG. 7A, the narrow opening is polygonal, which is not preferable in terms of aesthetics. In addition, when the narrow mouth side opening has a polygonal shape, after sealing the seal lid, a gap is formed between the seal lid and the narrow mouth opening, or the strength is reduced, so that deformation tends to occur. There is also a problem in terms of functionality.

  On the other hand, as shown in FIG. 6B, by narrowing the narrow-edge side edge of the intermediate body 22 into a wavy shape, it is allowed to expand the portion that becomes the crest of the wavy line when folded back. It is possible to prevent the narrow mouth portion of the body 22 from being broken when folded. Moreover, since the incurl mold used when forming the folded part 10 does not receive a large resistance from the edge of the folded part 10, it can be folded with a small press pressure. Therefore, the amount of liquid paraffin used for improving the slipperiness of the mold and the sheet material can be reduced or eliminated.

  FIG. 8 is a front view showing another example of the funnel part. The funnel part 30 shown in FIG. 8 is different from the funnel part 3 shown in FIG.

  The funnel part 30 includes a funnel portion 35 whose diameter narrows from the wide-mouth side opening to the narrow-mouth side opening, and a side wall portion 33 that surrounds the outer surface of the funnel portion 35 and is connected to the wide-mouth side opening of the funnel portion 35. . The funnel part 30 is also integrally formed using a material mainly made of paper. As a material for forming the funnel part 30, a laminated sheet of paper and polyethylene can be suitably used.

  The funnel portion 35 includes a discharge portion 31 that constitutes the narrow-side opening, and a tapered portion 32 that is connected to the discharge portion 31. In order to reinforce the narrow opening of the funnel part 30, a folded portion (not shown) is formed inside the discharge portion 31 by folding a part of the sheet material inwardly and sealing. Yes.

  The side wall portion 33 is a portion for welding the funnel part 30 to the inner surface of the container body 2. A plurality of folds 14 extending in the axial direction of the funnel part 30 are formed on the side wall 33. The folds 14 impart elasticity to the side wall 33. Instead of providing the folds 14, the side wall 33 may be provided with stretchability by providing a ruled line on the blank material and contracting the ruled line part. Further, by embossing, a plurality of concave portions extending in the axial direction of the funnel part 30 are provided, or the side wall portion 33 is molded so as to have a wave shape in which the distance from the axial center of the funnel part 30 increases or decreases. You may give elasticity to.

  9A to 9D are diagrams for explaining the manufacturing process of the funnel part shown in FIG. 8, and FIG. 10 is a cross-sectional view showing the state of the ruled line portion before and after drawing.

  First, a blank material 36 shown in FIG. 9A is produced by punching a sheet material mainly made of paper with a mold. The blank member 36 has a shape in which a part of a sector shape is cut out. More specifically, the blank member 36 has an arc 46, two straight lines 47 a and 47 b extending in the radial direction of the arc 46, and an arc having a smaller radius than the arc 47. 48. As a material of the blank material 36, for example, a sheet material having a layer configuration of polyethylene / paper / polyethylene can be suitably used. Further, a plurality of ruled lines 37 extending in the radial direction of the arc 46 are formed in the blank material 36.

  Next, the blank material 36 is wound around the frustoconical mandrel, the vicinity of the straight lines 47a and 47b is overlapped, and the overlapping portion is heat-sealed, whereby the substantially truncated cone shaped intermediate body 38 shown in FIG. 9B is obtained. Form.

Next, the intermediate body 39 shown in FIG. 9C is formed by performing press working using a heated mold. More specifically, the narrow mouth portion 40 and the tapered portion 41 connected thereto are formed by drawing the narrow mouth side portion of the intermediate body 38 shown in FIG. 9B. At this time, the taper angle θ ₅ of the taper portion 41 is larger than the taper angle θ ₄ of the intermediate body 38. Further, by pressing for forming the intermediate body 39, the vicinity of the ruled line 37 shown in FIG. 10A is welded in a crushed state as shown in FIG. 10B. Thus, the strength of the whole funnel part can be improved by pressing and hardening the sheet material so as to fill the concave portion of the ruled line 37.

  Next, the narrow portion of the intermediate body 38 is folded inward to form the intermediate body 42 shown in FIG. 9D. More specifically, first, the inner surface of the narrow opening portion of the intermediate body 38 is heated with hot air or the like to melt the sealant. Next, liquid paraffin is applied to the outer surface of the narrow mouth portion, the narrow mouth portion is folded inward with a mold, and the folded portion is sealed to the inner surface of the discharge portion 31. As shown in FIG. 9C, the narrow side edge is not cut into a wavy shape, but the narrow side part is drawn in advance into a straight or tapered shape with a very small taper angle. Therefore, there is little risk of the sheet material breaking.

  Then, liquid paraffin is applied to the wide mouth portion of the intermediate body 42 and then folded outward to form the side wall portion 33 shown in FIG. At this time, the side wall 33 is contracted in the circumferential direction by applying a crease 14 to the side wall 33 simultaneously with the formation of the side wall 33 using a mold provided with irregularities in a portion corresponding to the side wall 33. Further, by heating the mold to about 40 ° C., the side wall portion 33 is held in a contracted state, and the pleats 14 on the side wall portion 33 are prevented from spreading after molding. The funnel part 30 shown in FIG. 8 is completed through the above steps. The side wall portion 33 may be formed before the narrow portion is folded.

  As described above, according to the manufacturing method according to the present embodiment, a substantially frustoconical intermediate is produced using a sheet material mainly made of paper, and this is press-molded. Strong funnel parts can be manufactured at low cost.

<4. Manufacturing method of container body>
11A to 11D are views for explaining a method of manufacturing the container main body shown in FIG.

  First, a cup-shaped intermediate 51 shown in FIG. 11A is formed. Specifically, a rectangular sheet material is wound around the peripheral wall surface of a cylindrical mandrel, the edges are overlapped with each other, and the overlapping portion is heat-sealed to form a cylindrical intermediate body. Subsequently, at one end portion of the cylindrical intermediate body, the outer peripheral edge portion of the circular bottom member is sandwiched and sealed to form the intermediate body 51 shown in FIG. 11A. As a material for forming the side wall 15, a sheet material having a layer structure of polyethylene / paper / polyethylene terephthalate / polyethylene or a sheet material having a layer structure of polyethylene / paper / aluminum / polyethylene can be used.

  Next, the intermediate body 52 shown in FIG. 11B is formed. Specifically, after applying liquid paraffin to the open end portion of the intermediate 51, the curling mold is used to curl the open end portion outward about one turn, thereby forming the curling 53 at the open end portion. .

  Next, the intermediate body 54 shown in FIG. 11C is formed. Specifically, the lower part of the curling 53 of the intermediate body 52 and a part of the side wall 15 in the vicinity of the curling 53 are heated with hot air or the like to melt the sealant (the part indicated by the arrow in FIG. 11B). Further, it is curled outward to form a curling 55 shown in FIG. 11C. The curling 55 is obtained by winding the open end portion of the side wall 15 by 1.5 turns or more. Moreover, it is preferable to apply liquid paraffin to a mold for forming the curling 55 in advance.

  Then, as shown in FIG. 11D, the flange portion 17 is formed by sandwiching and curling the curling 55 from above and below using the molds 56 and 57. The container body 2 is completed through the above steps.

  As a conventional method of forming the flange portion 17, the formed curling is sandwiched between an ultrasonic horn and a receiving mold and crushed, and the crushed portion is ultrasonically welded, or curling is formed while heating, and curling is performed. The method of heat-pressing with a mold was employed. However, the former method has a problem that the pressure is concentrated on a relatively thick portion and scorching occurs. In particular, this problem is prominent when the thickness of the sheet material is 0.4 mm or more. In addition, the latter method has a problem in that the product cannot be manufactured due to buckling wrinkles occurring during pressing on the flange portion and the side wall due to a decrease in slipperiness of the heated sheet material. .

  According to the manufacturing method of the container body 2 according to the present embodiment, the squeezed portion is sufficiently welded only by crushing the curling 55 by heating and melting the sealant in advance during the formation of the curling 55. In addition, the flange portion 17 having no buckling wrinkles on the flange portion or the side wall and having a flat upper surface can be formed. Moreover, according to the manufacturing method which concerns on this embodiment, formation of the flange part 17 was possible even if the thickness of the sheet material was about 0.45 mm.

  In the present embodiment, the curling 53 is formed by winding the open end portion outward for about one turn, and after heating the curling 53, the curling 53 is further wound for about 0.5 turn, so that about 1.5 turns outward. The curling 55 that is wound around the circumference is formed, but the amount of winding described here is an example, and is not limited to this example. The curling amounts of the curlings 53 and 55 can heat and melt a part of the sealant of the curling 53 formed at the time of the first curling formation, and the sealant melted at the time of the next curling formation is wound inside the curling 55 and welded What is necessary is just to set so that it can be made.

<5. How to install the funnel parts>
12A to 12C are cross-sectional views showing a method of attaching the funnel part to the container body, and FIG. 13 is a cross-sectional view taken along the line XIII-XIII shown in FIG. 12B.

  First, as shown in FIG. 12A, the funnel part 3 is held by the chuck 60 inserted from the narrow side opening of the funnel part 3 into the inside, and the outer surface of the side wall 9 and the inner surface of the container body 2 are heated to sealant. To melt. Next, the chuck 60 is moved to insert the funnel part 3 into the container main body 2, and the funnel part 3 is arranged at an attachment position indicated by a two-dot chain line. Here, the side wall portion 9 of the funnel part 3 is molded in a state of being contracted in the circumferential direction by providing a fold, and the outer diameter of the side wall portion 9 is smaller than the inner diameter of the container body 2. Therefore, the funnel part 3 can be inserted into the container body 2 without bringing the side wall portion 9 into contact with the inner wall of the container body 2. As a result, it is possible to prevent generation of resin waste and a decrease in welding strength due to rubbing between the side wall portion 9 of the funnel part 3 and the inner surface of the container body 2. In sealing the funnel part 3 to the container body 2, it is preferable to heat both the outer surface of the side wall portion 9 and the sealing portion of the side wall portion 9 on the inner surface of the container body 2. Only one of the outer surface and the sealing portion of the side wall 9 on the inner surface of the container body 2 may be heated to melt the sealant.

  Next, as shown to FIG. 12B and 13, the side wall part 9 is joined to the container main body 2 using the expansion members 61a-61f. The expansion members 61 a to 61 f are arranged side by side in the circumferential direction of the funnel part 3, are movable in the radial direction of the funnel part 3, and move the side wall portion 9 on the inner surface of the container body 2 by moving radially outward. Can be crimped. The container body 2 is held by a jig (not shown) having a peripheral surface along the outer peripheral surface of the side wall 15. The crimping of the side wall 9 by the expansion members 61a to 61f may be performed a plurality of times. As shown in FIG. 12C, the funnel part 3 is fixed to the container body 2 as the sealant is cured by being subjected to pressure bonding and cooling by the expansion members 61 a to 61 f.

  FIG. 14 is a cross-sectional view illustrating warpage of the side wall portion of the funnel part.

  The funnel part shown in FIG. 14 has the same discharge part 6, first taper part 7 and second taper part 8 as the funnel part 3 shown in FIG. 3, but the funnel part is not provided with a fold on the side wall part 59. Different from part 3. As described above, since the side wall 59 is formed by folding the wide-mouthed side portion of the truncated cone-shaped intermediate body outward, the circumferential length differs between the fold line portion and the edge portion of the side wall 59. Therefore, while the temperature of the sheet material immediately after the formation of the side wall portion 59 is high, the side wall portion 59 can maintain a substantially constant outer diameter. However, when the sheet material contracts with cooling, the edge portion having a long peripheral length is formed. It spreads and the side wall 59 is warped.

  When the outer diameter of the side wall portion 59 is not constant and the side wall portion 59 is not stretchable, contact between the side wall portion 59 and the inner surface of the container body can be avoided when the funnel part is inserted into the container body. It will not be. As a result, resin scraps are generated, or the sealant is scraped, resulting in a decrease in welding strength.

  On the other hand, in this embodiment, the funnel part 3 is configured so that the side wall portion 9 can expand and contract in the circumferential direction, and the funnel part 3 is inserted into the container body 2 in a state where the side wall portion 9 is contracted. Thereafter, the side wall 9 is expanded and crimped to the container body 2. Therefore, it can be reduced that the melt-softened sealant is partially scraped and the welding strength is lowered. In addition, it is possible to reduce the occurrence of rough resin on the inner surface of the container body 2 and generation of powdery and thread-like resin scraps.

<6. Sealing the open end of the container body>
After the container body 2 assembled in the state shown in FIG. 12C is filled with the contents, the sealing lid 4 is heat-sealed to the flange portion 17 so as to cover the open end portion of the container body 2, and the structure is shown in FIG. The packaging container 1 is completed. The filling of the contents can be performed through a nozzle inserted from the narrow opening of the funnel part 3.

  INDUSTRIAL APPLICATION This invention can be utilized for the manufacturing method of the packaging container which can transfer easily the content which has fluidity | liquidity, such as a powder form, a granular form, and a liquid, to another container.

DESCRIPTION OF SYMBOLS 1 Packaging container 2 Container main body 3 Funnel part 4 Seal cover 6 Discharge part 7 1st taper part 8 2nd taper part 9 Side wall part 10 Folding part 11 Emboss 13 Funnel part 15 Side wall 16 Bottom part 17 Flange part 21 Blank materials 22, 23, 24 intermediate body 25 arc 26a, 26b straight line 27 wavy line 30 funnel part 31 discharge part 32 taper part 33 side wall part 35 funnel part 36 blank material 37 ruled line 38, 39 intermediate body 40 narrow mouth part 41 taper part 42 intermediate body 46 arc 47a, 47b Straight line 48 Arc 51, 52 Intermediate 53 Curling 54 Intermediate 55 Curling

Claims (5)

It is a method of manufacturing a packaging container that is used to wrap contents having fluidity such as powder, granules, liquid, etc., and transfer the contents to another container,
Using a sheet material including paper and sealants, a funnel whose diameter narrows from wide opening side to the narrow-mouthed side, the sheet material in wide mouth side of the funnel portion is returned folded outwardly over the entire circumference, of the funnel Forming a funnel part having a side wall surrounding the outer surface;
Forming a cup-shaped container body having a cylindrical side wall, a bottom, and an open end;
Attaching the funnel part to the inside of the container body,
The process of attaching the funnel part is as follows:
Heating and softening the sealant on the outer surface of the side wall,
Holding the funnel part in a state where the side wall of the funnel part is contracted in the circumferential direction so that the outer diameter of the side wall is smaller than the inner diameter of the open end of the container body, Inserting the funnel part into the container body toward the bottom of the container body;
An expansion member is inserted between the vicinity of the wide-mouthed portion of the funnel part of the funnel part inserted into the container body and the side wall part to push the side wall part outward, and the side wall part is expanded to the container. A method of manufacturing a packaging container, including a step of crimping to an inner surface of a side wall of the main body. It is a method of manufacturing a packaging container that is used to wrap contents having fluidity such as powder, granules, liquid, etc., and transfer the contents to another container,
A funnel portion having a diameter narrowed from the wide-mouth side to the narrow-mouth side using a sheet material including paper and a sealant, and a side wall portion connected to the wide-mouth side portion of the funnel portion and surrounding the outer surface of the funnel portion Forming a part;
Forming a cup-shaped container body having a cylindrical side wall, a bottom, and an open end;
Attaching the funnel part to the inside of the container body,
The process of attaching the funnel part is as follows:
Heating and softening the sealant on the outer surface of the side wall,
Holding the funnel part in a state where the side wall of the funnel part is contracted in the circumferential direction so that the outer diameter of the side wall is smaller than the inner diameter of the open end of the container body, Inserting the funnel part into the container body toward the bottom of the container body;
Expanding the side wall of the funnel part inserted into the container body, and crimping the side wall to the inner wall of the container body.
In the step of forming the funnel part, a method of manufacturing a packaging container, wherein a plurality of recesses extending in the axial direction of the funnel part are formed in the side wall portion, and the side wall portion is contracted in the circumferential direction.   The method of manufacturing a packaging container according to claim 1, wherein, in the step of forming the funnel part, a plurality of recesses extending in the axial direction of the funnel part are formed in the side wall portion, and the side wall portion is contracted in the circumferential direction. . In the step of attaching the funnel part, before the step of inserting the funnel part into the inside of the container body, the sealant at the portion where the side wall portion of the funnel part is sealed is heated on the inner surface of the side wall of the container body. The manufacturing method of the packaging container in any one of Claims 1-3 which further includes the process made to soften. The method further comprises the step of sealing the open end of the container body by sealing a film that is broken by receiving a pressing force after filling the contents into the container body after the step of attaching the funnel part. method for manufacturing a packaging container according to any one of 1 to 4.

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