JP4106316B2 - Paper container with lid for hot food and lid - Google Patents

Description

  The present invention relates to a lidded container and a lid. Specifically, the present invention relates to a lidded paper container for hot food and a lid.

  A lidded paper container is used to store and sell liquid foods such as hot coffee, tea, cocoa, and soup in stores and the like. At that time, the paper container with a lid is required to have high hermeticity so that the contents such as coffee, tea, and soup do not leak outside even if the container is shaken.

The inventor first experimented with a lid as shown in FIG. As the paper container 1 with a lid, a cylindrical one is illustrated, and has a reverse taper that expands toward the opening. It is comprised from the paper container 3 by which the curl part 32 was provided in the side surface 31, and the lid | cover 2 which has the fitting part 20 which can be fitted to the curl part 32. FIG. And since the side surface 31 of the paper container 3 is shape | molded by winding and bonding paper, it has the overlapping level | step-difference part 34 of paper. The paper overlap portion 33 is composed of two sheets of paper that overlap each other with a predetermined width (see, for example, Patent Document 1).

  The lid 2 is made of polystyrene. The fitting portion 20 provided on the lid 2 has a downward U-shape as a whole, and is formed in a shape that fits the curl portion 32 provided in the opening. And the fitting part 20 is comprised from the inner edge side surface 21, the folding | returning surface 23, the outer edge side surface 22, and the guide surface 24, and each is provided so that it may continue in order. The inner edge side surface 21 is formed vertically toward the folded surface 23. The outer edge side surface 22 is formed so as to expand toward the folded surface 23. The guide surface 24 guides the fitting when the lid 2 is fitted to the paper container 3.

  The lidded paper container 1 of FIG. 4 prevents leakage of the contents mainly by fitting the fitting portion 20 together.

  However, as shown in FIGS. 5 and 6, the side surface 31 of the paper container 3 has an overlapping portion 33 including an inner curled portion 321 and an outer curled portion 322, and thus an overlapping stepped portion 34 is formed.

For this reason, when hot food is put in the paper container 1 with the lid, the pressure inside the container increases due to evaporation or the like, and therefore, when the paper container 1 with the lid is shaken, the content overlaps and the gap 40 between the step portions 34. Through the experiment, it has been found that the problem is that it easily leaks to the outside due to intrusion through the surface and spreads over the entire fitting portion 20 due to surface tension.
JP-A-6-297650

  Therefore, in the present invention, when hot food is put into a paper container having a paper overlap portion on the side surface and causing a step, the contents are not leaked when the paper container is shaken. It is an object to provide a paper container with a lid and a lid.

In order to solve the above-mentioned problems, a cover-equipped paper container for hot food according to claim 1 of the present invention has a paper container on the side surface with an overlapping step portion of paper and into which the hot food is put, and an opening of the paper container And a lid provided with a fitting portion that can be fitted over the inner and outer surfaces, the lid is formed by mixing polypropylene and a predetermined amount of filler, and the fitting portion is formed on the inner surface of the paper container. The lid sheet has a thickness opposite to each other, the lid sheet has a thickness of 350 μm to 400 μm, and the reverse taper portion has the inner side surface of the reverse taper portion in a state where the lid is fitted to the paper container. It is formed so as to apply a predetermined pressing pressure to the overlapping stepped portion, and the gap between the overlapping stepped portion is closed by the heat of the hot food.

Further, the lid according to claim 3 of the present invention is used for a paper container having an overlapped step portion of paper on the side surface, and includes a fitting portion that can be fitted over the inner and outer surfaces of the opening portion of the paper container. The lid is formed by mixing polypropylene and a predetermined amount of filler, the fitting portion has a reverse tapered portion facing the inner surface of the paper container, and the thickness of the lid sheet is: 350 μm to 400 μm, and the reverse tapered portion is formed so that the inner side surface of the reverse tapered portion applies a predetermined pressing pressure to the overlapping stepped portion in a state where the lid is fitted to the paper container. The gap between the overlapping stepped portion is closed by the heat of the hot food put in the paper container.

  According to the above configuration, when the lid is fitted, a pressing pressure is generated by the reverse taper portion against the opposing surface of the paper container inner surface. And the softening of the reverse taper part by the heat | fever of a thermal food and the pressing pressure by a reverse taper part couple | bond together, and the gap | interval with the overlapping step part of paper closes.

A second aspect of the present invention is the paper container with a lid according to the first aspect, wherein a mixing ratio of the filler is 35 wt% to 45 wt% of the whole.
According to a fourth aspect of the present invention, in the lid according to the third aspect, the mixing ratio of the filler is 35 wt% to 45 wt% of the whole.

  According to the above configuration, the mixing ratio of the filler is optimized from the viewpoint of closing the gap in the overlapping step portion of the paper within the temperature range of the thermal food.

  As described above, according to the present invention, the gap at the overlapped step portion of the paper container is closed by providing the reverse taper portion at the fitting portion of the lid and forming the lid material from polypropylene and filler. Therefore, the content does not leak through the gap.

  Hereinafter, the lidded paper container for thermal food according to the present invention will be described based on the embodiments. Embodiment (1) of the present invention is shown in FIGS.

  FIG. 1 shows a paper container with a lid according to the embodiment (1). FIG. 2 is a partially enlarged view showing the AA cross section of FIG. 1 in a state where the lid and the paper container are fitted. 3 is a cross-sectional view taken along the line BB in FIG.

  As shown in FIG. 1, the lidded paper container 1 includes a lid 2 and a paper container 3.

  The paper container 3 is composed of a bottom surface 30 and a side surface 31 having a circular opening periphery, and a curling portion 32 is provided on the opening periphery of the side surface 31. The side surface 31 is formed by winding a single sheet of paper and pasting the end portions together, and thus has an overlapping step portion 34.

  2A and 2B, a curled portion 32 having an overlapping step portion 34 and a curled portion 32A located at a portion other than the overlapping step portion 34 are shown. The overlapping stepped portion 34 is formed by an inner curled portion 321 and an outer curled portion 322, and a step is generated at the end of the overlapping stepped portion 34.

  The thickness of the side surface 31 of the paper container is preferably 300 μm to 450 μm. When the thickness of the side surface 31 is less than 300 μm, the rigidity is not sufficient and the side surface 31 is easily deformed. When the thickness of the side surface 31 is greater than 450 μm, the gap 40 due to the overlapping stepped portion 34 is large, and the gap 40 may not be sufficiently closed by the lid 2.

Next, the lid 2 will be described.
The lid 2 is formed in a circular shape, and a fitting portion 20 that can be fitted to the peripheral edge of the opening of the paper container 3 is provided on the peripheral edge thereof. As shown in FIG. 3, the fitting portion 20 includes an inner edge side surface 21, a folded surface 23, an outer edge side surface 22, and a guide surface 24, and each is provided so as to be successively connected. And both the inner edge side surface 21 and the outer edge side surface 22 are formed so that a cross section may expand toward the folding surface 23, and become reverse taper shape.

  The lid 2 is formed by mixing polypropylene and filler. A resin composed of polypropylene and filler has moderate rigidity and thermoplasticity with respect to a normally assumed hot food (about 40 to 100 ° C.). That is, since the material has an appropriate rigidity, when the lid 2 is fitted, a pressure is applied to the curled portion 32 of the inner edge side surface 21 formed in a reverse taper shape. Moreover, since the material has moderate thermoplasticity, the inner edge side surface 21 is softened by heat and closes the gap 40 between the overlapping stepped portion 34 of the paper container 3.

  Examples of the filler include calcium carbonate, aluminum hydroxide, magnesium hydroxide, and calcium carbonate is particularly preferably used for food safety. In addition to calcium carbonate, other fillers can be used. A filler refers to a substance for improving various physical properties and properties.

The mixing ratio of the filler is preferably 35 wt% to 45 wt% of the whole. When the mixing ratio of the filler is greater than 45 wt%, the rigidity of the lid 2 increases and the flexibility decreases. For this reason, the lid 2 is difficult to be softened by heat, and the gap 40 between the overlapping step 34 of the paper cannot be sufficiently closed. On the other hand, if less than 3 5 wt%, the rigidity of the lid 2 is lowered. For this reason, the pressing pressure against the curled portion 32 by the inner edge side surface 21 due to heat is reduced, and the contents are likely to leak.

  The sheet thickness of the lid 2 is preferably 350 μm to 400 μm, although it depends on the filler content. When the sheet thickness is less than 350 μm, the rigidity of the material is lowered, and the pressing pressure against the curled portion 32 by the inner edge side surface 21 is lowered. On the other hand, when the sheet thickness is thicker than 400 μm, the rigidity of the material increases and the flexibility decreases.

  As a method for manufacturing the lid 2, a method such as compressed air molding or vacuum molding can be used, and there is no particular limitation as long as a reverse tapered portion is provided on the surface of the fitting portion facing the inner surface of the paper container.

  According to the embodiment (1), the pressing pressure against the curled portion 32 is generated by the inner edge side surface 21 provided in the fitting portion 20. Further, since the inner edge side surface 21 is softened by the heat of the contents, the adhesion between the inner edge side surface 21A and the curled portion 32A is improved at a portion other than the overlapping step 34 of the paper. And the softening of the inner edge side surface 21 due to the heat of the contents and the pressing pressure by the inner edge side surface 21 combine, and as shown in FIG. For this reason, when the contents such as beverages are shaken, the contents are not leaked from the gap 40 or the like due to the overlapping step portion 34 of the paper.

  Furthermore, since the outer edge side surface 22 of the fitting portion 20 is also formed in a reverse taper shape, the curled portion 32 is sandwiched and fixed by the pressing pressure of the outer edge side surface 22. Thereby, the pressing pressure of the inner edge side surface 21 acts on the curled portion 32 with certainty.

It is a perspective view which shows the paper container with a lid | cover for thermal food of Embodiment (1) which concerns on this invention. It is the fragmentary sectional view which showed the AA cross section of FIG. 1 in the state which the lid | cover and the paper container fitted. It is BB sectional drawing of FIG. It is sectional drawing of the paper container with a lid of another example. It is a principal part enlarged view of FIG. It is CC sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper container 2 with a lid | cover 20, 20A Fitting part 21, 21A Inner edge side surface 22, 22A Outer edge side surface 23, 23A Folding surface 24, 24A Guide surface 3 Paper container 30 Bottom surface 31 Side surface 32, 32A Curl part 321 Inner curl Part 322 outer curl part 33 overlapping part 34 overlapping step part 40 gap

Claims (4)

The paper container comprises a paper container in which a thermal food is placed with a stepped portion of paper overlapped on the side surface, and a lid provided with a fitting portion that can be fitted over the inner and outer surfaces of the opening of the paper container, the lid being made of polypropylene And a predetermined amount of filler, and the fitting portion has a reverse taper portion facing the inner surface of the paper container,
The lid sheet has a thickness of 350 μm to 400 μm, and the reverse taper portion is a state in which the lid is fitted to the paper container, and the inner side surface of the reverse taper portion has a predetermined pressing pressure against the overlapping step portion. A paper container with a lid for thermal food, characterized in that the gap between the overlapping stepped portion is closed by the heat of the thermal food.   The paper container with a lid according to claim 1, wherein a mixing ratio of the filler is 35 wt% to 45 wt% of the whole. A lid having a fitting portion that is used for a paper container having an overlapped step portion of paper on a side surface and can be fitted over the inner and outer surfaces of the opening of the paper container, the lid being made of polypropylene and a predetermined amount It is formed by mixing with a filler, and the fitting portion has a reverse taper portion facing the inner surface of the paper container,
The lid sheet has a thickness of 350 μm to 400 μm, and the reverse taper portion is a state in which the lid is fitted to the paper container, and the inner side surface of the reverse taper portion has a predetermined pressing pressure against the overlapping step portion. A lid formed by adding heat and closing a gap with the overlapping stepped portion by heat of the hot food put in the paper container.   The lid according to claim 3, wherein the mixing ratio of the filler is 35 wt% to 45 wt% of the whole.

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