JP2007099299A - Paper container for food, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper box for food which can be heated in a microwave oven while containing a refrigerated food therein, and is capable of preventing water coming from the refrigerated food from leaking outside. <P>SOLUTION: The paper box 1 for food is formed by erecting and pasting a blank sheet punched into a predetermined shape. The paper box 1 for food has a shape in which a top face opening and a bottom face opening of a cylindrical barrel portion 2 are covered by a top face flap 3 and a bottom face flap 4, and a water-receiving cup 10 is arranged close to an inner bottom part. The water-receiving cup 10 is formed of a thermoplastic resin-made sheet, and an outwardly developing part to be closely attached to an inner surface of the paper container 1 for food is provided on an edge. A flange 11 and a corner projection 12 form the outwardly developing part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a food paper container, and more particularly to a food paper container of a type that can be heated as it is in a microwave oven and a method for manufacturing the same.

Paper containers are widely adopted as food packages. An example of such a paper container can be seen in US Pat. Some frozen foods in paper containers can be heated by placing them in a microwave oven. An example of a paper container used for such a purpose can be seen in Patent Document 2.
Japanese Patent Laid-Open No. 11-321856 (page 2-3, FIG. 1-7) Japanese Utility Model Publication No. 3-120472 (full text specification, page 3-4, FIG. 1-3)

  When heated in a microwave oven or left at room temperature and naturally thawed, water from frozen foods (whether it is a component liquid of food or the frost attached to the food surface has been dissolved) In this specification, the expression “water” is used as a generic name in order to simplify the explanation. Frozen foods produce a significant amount of water when heated, depending on the type. When the frozen food package is a paper container, water is likely to leak from the gap where the flap is folded. If water leaks immediately after the freshly heated food in a paper container is taken out of the microwave, it is very dangerous because the water is in hot water.

  The present invention has been made in view of the above points, and provides a food paper container of a type that can be heated in a microwave oven while containing frozen food, in which water discharged from the frozen food does not leak outside. For the purpose.

  (1) In order to achieve the above-mentioned object, the present invention provides a water receiving cup formed from a thermoplastic resin sheet in a food paper container formed by raising and pasting a blank sheet punched into a predetermined shape. It is characterized by being placed in close contact with the bottom of the container.

  According to this structure, the water which came out of the contents can be received by the water receiving cup, and can be held inside the paper container without leaking outside.

  (2) Further, the present invention is characterized in that in the food paper container having the above-described configuration, an outward development portion that is in close contact with the inner surface of the container is formed at an edge of the water receiving cup.

  According to this configuration, the edge of the water receiving cup is in close contact with the inner surface of the container, and water drops flowing down along the inner surface of the container can be received without exception.

  (3) Moreover, the present invention is a process for covering the water receiving cup with the jig in an inverted state in producing a food paper container in which the water receiving cup formed from the thermoplastic resin sheet is disposed in close contact with the inner bottom portion; Inverting the food paper container in a state where only the trunk portion is raised, and covering the water receiving cup held by the jig, and covering the water receiving cup with a bottom flap connected to the trunk portion. It is characterized by sequentially performing the folding and pasting steps.

  According to this configuration, a paper container having a thermoplastic resin sheet water receiving cup on the inner bottom surface can be efficiently manufactured.

  According to the present invention, it is possible to form a food paper container in which water discharged from the contents does not leak to the outside, and it is suitable as a food paper container that can be heated in a microwave while containing frozen food.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a food paper container, FIG. 2 is a cross-sectional view of the food paper container, FIG. 3 is a cross-sectional view of the food paper container after opening, and FIG.

  The food paper container 1 is a taper carton similar to that described in Patent Document 1, a blank sheet having a predetermined shape is opened, and a predetermined portion is glued with hot air, hot melt adhesive, cold glue adhesive, or the like. Formed. Blank sheets are stamped into a predetermined shape of printed paper sheets with material properties such as water resistance, oil resistance, heat resistance, and water repellency required for food paper containers that are heated in a microwave oven with frozen foods in them. A fold line, a zipper for opening, or a half cut line (a line formed by inserting a blade up to the middle of the thickness of the paper) is inserted.

  The food paper container 1 includes a cylindrical body 2. The horizontal section of the body part 2 is a quadrilateral, and its cross-sectional area increases toward the top. A top surface flap 3 and a bottom surface flap 4 (see FIG. 4) are connected to each surface of the body portion 2, and the top surface of the body portion 2 is attached by folding and attaching these flaps in a predetermined order. The bottom opening is closed. An opening tape portion 5 composed of a half-cut line from the inner surface and a half-cut line from the outer surface is formed at a location near the top surface of the body portion 2.

  When the opening tape portion 5 is peeled off and the portion above it is removed, the contents are exposed and can be taken out. The portion above the opening tape portion can be covered as a lid 6 (see FIG. 3). Heating by a microwave oven is performed by covering the lid 6 after being opened in this manner. The reason for covering the lid 6 is to confine steam and produce a steaming effect.

  A feature of the present invention is that a water receiving cup 10 formed from a thermoplastic resin sheet is disposed in close contact with the inner bottom portion of the food paper container 1. The water receiving cup 10 is formed by vacuum forming a thin synthetic resin sheet having a predetermined heat resistance such as polypropylene (PP) to form a cup shape, and punching it in a form leaving a flange 11 at the edge of the opening, It has a horizontal cross section and a taper shape that are in close contact with the inner bottom of the food paper container 1 without a gap. The flange 11 spreads outward to form an outward development portion, and its edge is in close contact with the inner surface of the food paper container 1. Due to the presence of the water receiving cup 10, the water discharged from the contents can be received by the water receiving cup and kept inside the food paper container 1 without leaking to the outside.

  The water receiving cup 10 is attached to the inner bottom portion of the food paper container 1 as follows. As shown in FIG. 4, an anvil-shaped jig 20 is prepared, and the water receiving cup 10 is covered with the jig in an inverted state. Then, the food paper container 1 in a state where only the trunk portion 2 is raised is inverted and is placed on the water receiving cup 10 held by the jig 20. Thereafter, the bottom flap 4 continuously provided on the body portion 2 is folded and glued so as to cover the water receiving cup 10, whereby the food paper container 1 having the water receiving cup 10 inside and the bottom closed is completed. . When the paper container 1 is turned upside down, the contents are put through the opening on the top surface, the top surface flap 3 is closed and glued, the food paper container 1 is in a completed form.

  Since the flange 11 that spreads outward is provided as the outward development portion, the water receiving cup 10 always has a mouth portion at the food paper container 1 even if a gap is formed between the main body portion and the food paper container 1. It will be in close contact with the inner surface. Therefore, it is possible to catch all the water drops flowing down along the inner surface of the food paper container 1.

  FIG. 5 shows a second embodiment of the present invention. FIG. 5 is a perspective view of the water receiving cup.

  In the second embodiment, the water receiving function of the water receiving cup is further enhanced. That is, the water receiving cup 10a of the second embodiment includes a substantially triangular corner projection 12 at a corner of the cup between the flange 11 and the flange 11. This corner projection 12 also constitutes an outward development portion, like the flange 11. When the water receiving cup 10 a is put in the food paper container 1, the corner projection 12 closes the corner of the inner surface of the food paper container 1. As a result, water drops flowing down along the corners of the inner surface of the food paper container 1 can be received by the water receiving cup 10a without missing.

  In order to prevent the water receiving cup 10 from being lifted, the food paper container 1 and the water receiving cup 10 may be pasted together.

  While the embodiments of the present invention have been described above, various modifications can be made without departing from the spirit of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely used for paper containers for frozen foods, in particular, paper containers of the type that can be heated by placing them in a microwave oven while containing the contents.

Perspective view of food paper container Cross section of food paper container Cross section of food paper container after opening Food process container manufacturing process conceptual diagram A perspective view of a water receiving cup used in the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Food paper container 2 Body part 3 Top surface flap 4 Bottom surface flap 5 Opening tape part 10, 10a Water receiving cup 11 Flange (outward expansion | deployment part)
12 Corner protrusion (outward development part)

Claims (3)

In a food paper container formed by opening and pasting a blank sheet punched into a predetermined shape,
A food paper container comprising a water receiving cup formed of a thermoplastic resin sheet in close contact with the bottom of the container.   The food paper container according to claim 1, wherein an outward spreading portion that is in close contact with the inner surface of the container is formed at an edge of the water receiving cup. In manufacturing a food paper container in which a water receiving cup formed from a sheet made of thermoplastic resin is closely attached to the inner bottom portion,
Covering the jig with the water receiving cup in an inverted state;
Inverting the food paper container in a state where only the trunk is raised, and covering the water receiving cup held by the jig;
Folding and pasting the bottom flap connected to the body part over the water receiving cup;
A method for manufacturing a food paper container characterized by sequentially performing the steps.

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