JP5580078B2 - Packaging container - Google Patents

Description

  The present invention relates to a packaging container having a large number of ribs on the outer periphery of the container side surface.

  Conventionally, many containers in which a synthetic resin sheet is thermoformed are used as packaging containers for packaging food. A container formed by thermoforming this synthetic resin sheet is lightweight but excellent in strength and has a small amount of resin material required for production, and thus can be said to be a packaging container suitable for the demand for simplifying packaging.

  Many packaged foods in which food is contained in such packaging containers are sold at convenience stores and supermarkets. These packaged foods are often eaten after being warmed in a microwave oven, but the heat of the packaged food is transmitted, and the packaging container itself becomes hot and difficult to hold by hand.

  As means for solving such a difficulty, a method is adopted in which the container is molded with a highly heat-insulating foamed resin, has a double structure, a handle is provided on the outer peripheral edge of the container, and paper is wrapped around the side of the container.

  As conventional examples of packaging containers having a double structure, the lid is reversed and the container body is fitted to make it difficult to transfer heat (the invention described in Patent Document 1), or by providing reinforcing ribs between the inner and outer layers, And the like having a hollow double structure (invention described in Patent Document 2).

JP 2008-150099 A JP-A-7-132777

  The packaging container molded from the above foamed resin is excellent in heat insulation, but has problems in heat resistance, oil resistance, chemical resistance and the like. Packaging containers provided with a double structure or a handle have disadvantages in terms of cost such that the amount of resin required for production increases and the molding method becomes complicated. Even paper-wrapped paper has drawbacks such as requiring a separate process.

  The present invention is also devised in order to prevent the above-described heat when held by hand, and solves the problem by means such as providing a large number of ribs on the side surface of the packaging container.

  A more specific solution is as follows.

  Claim 1: In a packaging container provided with a large number of ribs on the side surface, ribs are provided at a density of 3 or more per 20 mm side length at a low rib number density, and the maximum depth of the ribs is 1.3 mm or more, The diameter of the rib is set to 3.0 mm or less, more preferably 2.0 mm or less.

  [2] A packaging container as set forth in [1], wherein a hill is provided on the bottom surface.

  [3] The packaging container according to [2], wherein the height of the hill is set to 3.0 mm or more and the width is set to 4.0 mm or less.

  Claim 4: The packaging container is formed by placing a thermoplastic resin sheet on a male mold and vacuum forming or vacuum / pressure forming.

  It will be described in detail how the present invention configured as described above has an effect of solving the problems.

  As a result of diligent research, the present inventors have found that by providing a large number of ribs 3 on the side surface of the packaging container as shown in FIG. 1, the heat when the packaged food is heated can be prevented. More specifically, as shown in FIG. 4, three or more ribs 3 per 20 mm side length are provided at a portion where the rib number density is low, and the maximum depth H of the ribs 3 is formed to be 1.3 mm or more. It has been found that heat can be effectively prevented by setting the thickness to 3.0 mm or less, more preferably 2.5 mm or less.

  By providing three or more ribs 3 per side length of 20 mm, the distance between the ribs 3 and 3 is reduced, the finger is prevented from directly touching the side of the container, and the height H is set to 1.3 mm or more. Is efficiently prevented from reaching the top of the rib 3.

  Furthermore, the strength is increased by providing a large number of ribs.

  Moreover, it can prevent that the rice grain and other foodstuffs contained in packaged food are set in the rib 3 by setting the diameter W to 3.0 mm or less, and it is contained in packaged food by setting it to 2.5 mm or less. It is possible to prevent as much as possible that the juice accumulates in the rib 3 and the rib 3 becomes hot.

  Furthermore, by providing a large number of ribs 3 on the side surface, it is possible to ensure a vapor escape path and to prevent the packaged food from sticking due to water droplets. On the other hand, the rib groove becomes a space through which the steam passes, and the food can be efficiently steamed and heated.

  In order to mold the rib 3 satisfying the above numerical requirements, it is preferable to dispose a thermoplastic resin sheet 6 on the male mold 2 as shown in FIG. 4 and shape it by vacuum molding or vacuum / pressure forming. This is because by using the male mold 5, a mold exists in the rib 3 when the rib 3 is molded, and the rib 3 can be prevented from being crushed or deformed.

  On the other hand, when a female mold is used, it is difficult to form a shape that is narrow as in the case of the present rib 3, is higher than the diameter, and is hollow.

  On the other hand, according to injection molding, it is possible to mold a similar shape, but the mold is expensive, mass production is difficult and time consuming, and the resin thickness is 0.6 mm or more, and vacuum molding, vacuum / compression It has a drawback that it becomes thicker than molding.

  The packaging container according to claim 2 is provided with a hill 4 on the bottom surface. This is for preventing the fingertip from directly touching the bottom surface and preventing the heat from being transmitted. The hill 4 also has an anti-slip effect when held by hand.

  In the packaging container according to claim 3, the height of the hill 4 is set to 3.0 mm or more and the width is set to 4.0 mm or less. According to the knowledge obtained by the present inventors, if such a condition is satisfied, even if hot food is packaged, it is possible to prevent the hill itself from becoming hot as much as possible.

  In order to mold a hill satisfying such conditions, it is preferable to arrange the thermoplastic resin sheet 6 on the male mold 5 and shape it by vacuum molding or vacuum / pressure molding for the same reason as described above.

  Further, when molding is performed using a male mold, a groove 4a is formed on the inner surface of the hill as shown in FIG. Water such as juice is accumulated in the groove 4a, and the effect of preventing the food from sticking is also produced.

Front view of the present invention Bottom view AA line sectional view in FIG. Explanatory drawing schematically showing rib forming Front view showing another embodiment

  Hereinafter, an embodiment of the preferred invention will be outlined.

  As shown in FIG. 1, the packaging container according to the present invention includes a container main body 1, a peripheral side frame 2 attached to the outer peripheral edge of the container main body 1, and a hill 4 provided at the bottom.

  As shown in FIG. 2, the container body 1 is not limited to a circular shape in plan view (bottom view), and may be a square or other polygonal shapes (note that FIG. 2 makes the cross section visible). Therefore, it is drawn thicker than actual).

  The hill 4 is not limited to a circular shape as viewed from the bottom as shown, and may be a square or other polygonal shapes. Furthermore, the height 4 may be one or plural. When the hill 4 is provided concentrically as shown in FIG. 2, the fingertip can come into contact with the inner hill 4, and the vicinity of the first joint can be brought into contact with the outer hill 4, and the finger is heated more reliably. It can prevent touching the bottom. As shown in FIGS. 1 to 3, if the notch 4a is provided on the hill 4, the amount of resin required can be reduced, which contributes to the cost and can increase the strength.

  As described above, the height 4 is preferably provided with a height of 3.0 mm or more and a width of 4.0 mm or less.

  A plurality of ribs 3 are provided on the side surface of the container body 1. It is preferable that three or more ribs 3 are provided per side length of 20 mm, the maximum depth H is 1.3 mm or more, and the diameter W is 3.0 mm or less, more preferably 2.5 mm or less in a portion where the rib number density is low. As described above. In the case of the substantially cylindrical container shown in FIGS. 1 to 3, the number of ribs 3 is set at a density of 3 or more in the width per 20 mm on the circumference of the outer periphery of the side surface. That's what it means.

  Moreover, since the diameter is reduced from the upper part to the lower part of the container in the portion having a low rib number density in FIG. 1, the rib number density per width increases. Therefore, the vicinity of the upper end corresponds to “a portion having a low rib density”.

  On the other hand, in the case of a container in which a rib is not provided at a specific portion of the peripheral surface as shown in FIG. 5, the “rib number density” in the portion where the rib is provided is set to be 3 or more. is there.

  The packaging container according to the present invention is made of a thermoplastic resin vacuum molded product or a vacuum / pressure molded product. Specifically, it is formed by thermoforming a thermoplastic resin sheet (plastic sheet). Examples of the plastic include polypropylene (PP), polypropylene talc (PP.T), polyethylene terephthalate (PET), polycarbonate, or polystyrene. (PS) or the like may be used alone or in combination of two or more.

  Specifically, the molding method is as follows, for example. After the thermoplastic resin sheet 6 is heated, the thermoplastic resin sheet 6 is placed on the male mold 5 having the shape shown in FIG. After holding and cooling, it is removed from the mold and formed.

3. ・ Rib 4 ・ ・ High stand 5 ・ ・ Male 6 ・ ・ Thermoplastic resin sheet

Claims (3)

A packaging container provided with a large number of ribs on the side surface, wherein the ribs 3 are provided at a density of 3 or more per 20 mm side length at a low rib number density, and the rib 3 has a maximum depth of 1.3 mm or more, The diameter of the rib 3 is 3.0 mm or less, more preferably 2.0 mm or less,
A packaging container provided with a plurality of hills 4 on a concentric circle on the bottom.   The packaging container according to claim 1, wherein the height of the height 4 is set to 3.0 mm or more and the width is set to 4.0 mm or less.   The packaging container according to claim 1 or 2, wherein the thermoplastic resin sheet (6) is placed on the male mold (5) and shaped by vacuum molding or vacuum / pressure forming. Production method.

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