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JP-2026075850-A - Method for manufacturing a tube member for a container and a tube member for a container

JP2026075850AJP 2026075850 AJP2026075850 AJP 2026075850AJP-2026075850-A

Abstract

[Problem] To provide a container tube component that improves manufacturing yield and is inexpensive. [Solution] A method for manufacturing a tube member 1 for a container, in which a tube container 1T is manufactured by sealing the open end, comprises: pushing open the first open end 12P of a cylindrical body 10 from the inside so that the inner surface 12Pa expands in diameter as it moves toward the side opposite to the main body 11; inserting a core 60 into the internal space SP of the cylindrical body 10 from the expanded first open end 12; positioning the core 60 inserted into the internal space SP on the inner circumference side of the main body 11 and the second open end 13; positioning a cavity 70 so that it faces the core 60 positioned on the inner circumference side of the main body 11 and the second open end 13 via the second open end 13; and injecting a resin material between the core 60 and the cavity 70 to form a dispensing portion 20 made of resin material so that the dispensing portion 20 is joined to the second open end 13. [Selection Diagram] Figure 10

Inventors

  • 森田 皓介
  • 稲川 義則
  • 柴田 博幸
  • 小川 卓也

Assignees

  • 株式会社フジシールインターナショナル

Dates

Publication Date
20260511
Application Date
20241023

Claims (4)

  1. A method for manufacturing a tube component for a container, wherein a tube container is manufactured by sealing the open end, A cylindrical body comprising a main body having a cylindrical outer shape extending in the extending direction, a first open end extending from the main body to one side in the extending direction, and a second open end extending continuously from the main body to the other side in the extending direction, is molded from a single resin sheet. The first open end of the cylindrical body is pushed open from the inside so that the inner diameter expands as it moves toward the side opposite to the main body, Inserting the core into the internal space of the cylindrical body from the first open end that has been spread open, The core inserted into the internal space is positioned on the inner circumference side of the main body and the second open end, The cavity is positioned so as to face the core, which is located on the inner circumference side of the main body and the second open end, via the second open end. A method for manufacturing a container tube member, comprising: injecting a resin material between the core and the cavity to form the dispensing portion so that the dispensing portion made of the resin material is joined to the second open end.
  2. Expanding the first open end includes pressing the pressing member against the inner surface, The method for manufacturing a container tube member according to claim 1, wherein the temperature of the portion of the pressing member that is pressed against the inner surface is near the glass transition temperature of the resin constituting the inner surface.
  3. Expanding the first open end further includes inserting the pressing member into the cylindrical body from the first open end, The pressing member includes a first edge, a second edge, and a circumferential surface. The first edge has an annular shape with a diameter smaller than the first open end before it is expanded. The second edge has an annular shape with a diameter larger than the first open end before it is expanded. The second edge is positioned in a direction opposite to the direction in which the pressing member is inserted into the first open end, when viewed from the first edge, when the pressing member is inserted into the cylindrical body. The aforementioned circumferential surface connects the first edge and the second edge to each other. The method for manufacturing a container tube member according to claim 2, wherein the circumferential surface is heated and pressed against the inner surface when the pressing member is pressed against the inner surface.
  4. A tube component for containers, wherein a tube container is manufactured by sealing the open end, A cylindrical body, It is equipped with a dispensing section, The aforementioned cylindrical body is made of a single resin sheet, The cylindrical body includes a main body, a first open end, and a second open end. The main body has a cylindrical outer shape that extends in the direction of extension. The first open end extends from the main body to one side in the extending direction, The second open end extends from the main body to the other side in the extending direction, The dispensing portion is joined to the second open end, The first open end is a container tube member in which the inner diameter widens towards the side opposite to the main body.

Description

This disclosure relates to a method for manufacturing a container tube member and to a container tube member. International Publication No. 2023/238800 discloses a method for manufacturing a tube container. The tube container comprises a cylindrical body and a dispensing section. The cylindrical body is made from a single sheet. The dispensing section is joined to the cylindrical body by so-called insert molding. In the dispensing section joining step, one end of the cylindrical body is placed inside a mold. The dispensing section is injection molded onto the cylindrical body by filling the mold with a molten resin composition onto one end of the cylindrical body. In the end joining step, a pair of sheets facing each other in a direction perpendicular to the axial direction of the cylindrical body are welded together at the other end. When manufacturing a tube container with contents, for example, after the dispensing section joining step and before the end joining step, the contents are filled into the cylindrical body from the other end. International Publication No. 2023/238800 This is a perspective view showing a container tube member according to one embodiment.This is a perspective view showing a tube container manufactured from a container tube component.This is a perspective view showing other tube containers manufactured from the same tubular material used for containers.Figure 1 is a cross-sectional view of the container tube member as seen in the direction of the arrow IV-IV.This is a flowchart showing a manufacturing method for a container tube member according to one embodiment.This is a perspective view showing a cylindrical body molded from a resin sheet, immediately after molding.This is a schematic perspective view showing the state of the cylindrical body just before its first open end is pushed open.This is a schematic cross-sectional view showing how the first open end of a cylindrical body is being spread open.This is a perspective view showing a cylindrical body with the inner surface of the first open end enlarged.This is a schematic perspective view showing the state just before the core is inserted into the cylindrical body.This is a cross-sectional view showing a cylindrical body with a portion of the core inserted into it.This is a cross-sectional view showing a cylindrical body with a core inserted.This is a cross-sectional view showing the completed placement of the core into the internal space of the cylindrical body.This is a cross-sectional view showing the completed placement of the cavities.This is a cross-sectional view showing the state immediately after the resin material has been injected.This is a cross-sectional view showing how the container tube component is separated from the cavity.This is a perspective view showing the process of removing a container tube component from the core. A container tube member and its manufacturing method according to one embodiment of this disclosure will be described with reference to the drawings. In the drawings referenced below, the same or equivalent members are numbered. Furthermore, in this specification, "a component containing a specific resin as its main component" may mean that the content of that specific resin in the component is 85% by mass or more, 90% by mass or more, 95% by mass or more, or 99% by mass or more. (Tube component for containers) Figure 1 is a perspective view showing a container tube member according to one embodiment. Figure 2 is a perspective view showing a tube container manufactured from the container tube member. As shown in Figures 1 and 2, the container tube member 1 of this disclosure is used to manufacture a tube container 1T by sealing the open end. The container tube member 1 comprises a cylindrical body 10 and a dispensing portion 20. The cylindrical body 10 includes a main body portion 11, a first open end 12, and a second open end 13. The main body portion 11 includes an end region 111 and a main body region 112. The open end, which is sealed for manufacturing the tube container 1T, consists of the first open end 12 and the end region 111, which will be described later. The tube container 1T is equipped with an end seal portion 1TE. The end seal portion 1TE is formed by welding opposing portions in a direction perpendicular to the opening direction at the open end (first open end 12 and end region 111) of the container tube member 1. In Figure 2, for convenience, the components in the tube container 1T corresponding to each component of the container tube member 1 are numbered the same as those of the container tube member 1. The welding method for forming the end seal portion 1TE may be heat welding or ultrasonic welding. Heat welding may be performed by heating with hot air. Figure 3 is a perspective view showing another tube container manufactured from the container tube member. As shown in Figure 3, in the other tube container 1Ta, the end seal portion 1TEa may be formed by cutting off a