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JP-2026075825-A - Paper container and method for manufacturing the same

JP2026075825AJP 2026075825 AJP2026075825 AJP 2026075825AJP-2026075825-A

Abstract

[Problem] To reduce the amount of oil-resistant agent used to control costs, while eliminating uneven application and efficiently penetrating the oil-resistant agent to the areas of the substrate where oil resistance is required. [Solution] The method for manufacturing a paper container according to the present invention includes the steps of: forming a blank bundle by stacking a plurality of fan-shaped paper substrates that will form the body; pressing the blank bundle with a pair of clamping plates by pressing one main surface and the other main surface of the blank bundle with the clamping plates; impregnating at least a portion of the end faces of the blank bundle with an oil-resistant agent via an oil-resistant agent application roller while the blank bundle is pressed with the clamping plates; drying the end faces of the blank bundle that have been impregnated with the oil-resistant agent via a drying device; and after the drying process, separating the paper substrates that have been impregnated with the oil-resistant agent at their lateral ends from the blank bundle and fixing the lateral ends of the paper substrates together to form the body. [Selection Diagram] Figure 2

Inventors

  • 荒木 慶
  • 並木 邦裕
  • 阿部 裕

Assignees

  • 東罐興業株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (10)

  1. A method for manufacturing a paper container comprising a bottom plate and a peripheral wall-shaped body portion rising from the periphery of the bottom plate, The process of forming a blank bundle by stacking multiple fan-shaped paper substrates that will form the body, The process involves clamping the blank bundle with the clamping plates by pressing one main surface of the blank bundle against the other main surface of the blank bundle via a pair of clamping plates, The process involves applying pressure to the blank bundle with the clamping plate, and then impregnating at least a portion of the end faces of the blank bundle with an oil-resistant agent via an oil-resistant agent application roller. A step of drying the end face of the blank bundle impregnated with the oil-resistant agent using a drying device, After the drying process, the paper substrate impregnated with the oil-resistant agent at its lateral end is separated from the blank bundle, and the lateral ends of the separated paper substrates are fixed together to form the body portion. A method for manufacturing a paper container, characterized by including the following:
  2. The oil-resistant agent comprises an oil-resistant resin component, water, and alcohol. A method for manufacturing a paper container according to claim 1, wherein the ratio of the alcohol to the oil-resistant resin component is adjusted so that the surface tension of the oil-resistant agent is 19.2 to 30.3 mN/m.
  3. A method for manufacturing a paper container according to claim 1, comprising sliding the oil-resistant coating roller and the drying device in parallel against the end face of the blank bundle, thereby impregnating the end face with the oil-resistant coating roller, and subsequently drying the end face with the drying device.
  4. A forward process involves sliding the oil-resistant coating roller and the drying device in a first direction passing directly below the end face to apply and dry the oil-resistant agent to the end face using the oil-resistant coating roller. A method for manufacturing a paper container according to claim 3, comprising a return step of sliding the oil-resistant coating roller and the drying device in a second direction opposite to the first direction while moving the oil-resistant coating roller away from the end face, thereby drying by the drying device without applying the oil-resistant agent.
  5. A method for manufacturing a paper container according to any one of claims 1 to 4, comprising: placing the end face of the blank bundle on a slit plate with an opening while the blank bundle is pressed with the clamping plate; and impregnating at least a portion of the end face with the oil-resistant agent using the oil-resistant agent application roller through the slit plate while the end face is exposed through the opening.
  6. The method for manufacturing a paper container according to claim 5, wherein the blank bundle is supported by a side support member when the end face of the blank bundle is supported on the slit plate.
  7. The base plate and It has a side seam region formed by overlapping and joining one side end of a fan-shaped paper substrate to the other side end, and a peripheral wall-shaped body portion rising from the periphery of the bottom plate, A paper container equipped with, On one of the lateral ends located on the inner surface side of the body, an oil-resistant impregnation region is formed, having a concentration gradient of the oil-resistant agent from one lateral end toward the other lateral end. A paper container characterized by the following features.
  8. The paper container according to claim 7, wherein the oil-resistant impregnation region is formed such that the impregnation width of the oil-resistant agent from one side end does not exceed the side seam region.
  9. A resin layer is laminated to the inner circumferential surface of the aforementioned paper substrate, which is the inner surface side. The paper container according to claim 8, wherein the impregnation width from one of the side ends is inclined such that it increases from the inner surface to the outer surface in the thickness direction of the paper substrate.
  10. A resin layer is laminated to the inner circumferential surface of the paper substrate that is on the inner side and to the outer circumferential surface opposite to the inner circumferential surface. The paper container according to claim 8, wherein the impregnation width from one of the lateral ends is inclined in the thickness direction of the paper substrate such that it increases from the inner circumferential surface and the outer circumferential surface towards the center.

Description

This invention relates to a paper container that uses fewer materials and has excellent oil resistance, and to a method for manufacturing the same. Paper containers, such as paper cups and paper trays, are used to store food and beverages. Paper containers are formed by combining a base plate and a body to create a cup or tray shape. Generally, paper containers are laminated with a thermoplastic resin such as polyethylene or PET film on the inner surface to prevent moisture and oil contained in the food from seeping into the body and base plate. Incidentally, paper containers can sometimes store foods containing relatively high levels of oil, and in such cases, oil can penetrate the body and bottom plate of the paper container. In response to this, Patent Document 1 proposes molding paper containers using water- and oil-resistant paper, in which a fluorine-based oil-resistant agent with a perfluoroalkyl group having a carbon chain length of 6 or less is impregnated and attached to a base paper mainly composed of porous fibers. Furthermore, Patent Document 2 discloses applying a water- and oil-resistant penetration-preventing coating liquid using a dispenser or spray only to the joints between the body sections and the joint between the body section and the bottom plate on the inner surface of the molded paper container. Japanese Patent Publication No. 2009-120996Japanese Patent Publication No. 2017-52199 This is a schematic diagram showing a paper container according to an embodiment and a blank as the base material constituting this paper container.This is a schematic cross-sectional view showing portion α in Figure 1.This is a schematic diagram showing the state of a blank (paper substrate) impregnated with an oil-resistant agent.Figure 2 is an enlarged cross-sectional view of section β, and is a schematic diagram showing the end of the body of a paper container molded using a blank impregnated with an oil-resistant agent.This is a front view showing the configuration of a paper container manufacturing apparatus according to an embodiment.This is a side view showing the configuration of a paper container manufacturing apparatus according to an embodiment.This is a top view showing the configuration of a paper container manufacturing apparatus according to an embodiment.This is a schematic diagram showing the configuration of the roller coating section of a paper container manufacturing apparatus according to the embodiment.This is a schematic diagram (part 1) illustrating the arrangement of the blank bundle in the manufacturing method of a paper container according to the embodiment.This is a schematic diagram (part 2) illustrating the arrangement of the blank bundle in the manufacturing method of a paper container according to the embodiment.This is a schematic diagram illustrating the method of applying an oil-resistant agent to a blank bundle in a method for manufacturing a paper container according to an embodiment.This is a schematic cross-sectional view showing the end of the body of a modified paper container. The following description will specifically explain the paper container and its manufacturing method according to this embodiment, with reference to the drawings as appropriate. The following embodiments describe one example to which the present invention is applied, and are not intended to limit the invention in any way. Furthermore, other known configurations, including those described in the above-mentioned patent documents, may be appropriately supplemented and implemented. In the following, the vertical direction with respect to the installation surface of the device will be defined as the Z direction, the short-side direction of the opening OP (described later) in which the oil-resistant coating roller and drying device move will be defined as the X direction, and the long-side direction of the opening OP will be defined as the Y direction for convenience. [Paper container 100] First, the paper container 100 in this embodiment will be described with reference to Figures 1 and 2 as appropriate. As shown in the figures, the paper container 100 in this embodiment can be exemplified by a paper cup made of a paper base material. In the following description, a paper cup will be used as an example of the paper container 100, but various known paper containers having a side seam region on the body, such as a paper tray, are included in the paper container 100 of this embodiment. As shown in the figure, the paper container 100 of this embodiment comprises a bottom plate 10 and a peripheral wall-shaped body portion 20 rising from the periphery of the bottom plate 10. The bottom plate 10 has a circular outer shape, for example, if the paper container 100 is cylindrical. The body portion 20 has a peripheral wall-shaped outer shape rising from the periphery of the bottom plate 10, achieved by molding a paper base material 30 so that the body portion 20 surrounds the periphery of the bottom plate 10