JP2005132472A - Packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container for easily pulling out one or a plurality of containers from a plurality of containers piled up. <P>SOLUTION: This container main body 11 constituting a packaging container is provided with a bottom wall 21 and a peripheral wall 22 provided standing on the peripheral edge of the wall 21. The wall 22 is formed in a tapered shape and the further it is from the wall 21, the more outwardly it expands. The bottom wall side end part of the wall 22 is formed with a thick part 31. The part 31 is formed by inclining the inside face 31a of the part 31 to be apart from the outside face 31b of the part 31 as it comes closer to the wall 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention includes, for example, semi-solid foods such as yogurt, pudding, jelly, and ice cream, solid foods such as candy, chocolate, cookies, and biscuits, and liquid foods such as coffee, soft drinks, tea, and miso soup. The present invention relates to a packaging container used for housing.

Conventionally, as this type of packaging container, a bottomed cylinder having a disk-like bottom wall and a cylindrical peripheral wall erected from the periphery of the bottom wall by injection molding such as insert molding or in-mold molding What is formed in a shape is known. In recent years, packaging containers having a thin peripheral wall have been proposed for various purposes. For example, in Patent Document 1, in order to reduce product cost and save resources, and to enable printing on the outer peripheral surface of the peripheral wall, the peripheral wall is provided with a tapered triangular or trapezoidal thickened portion and a thinned portion in the circumferential direction. Packaging containers formed alternately are described. Patent Document 2 describes a packaging container in which a concave groove-like thin part is formed in a vertical stripe shape on the inner peripheral surface of a peripheral wall for the purpose of reducing the volume by crushing after use.
JP 2001-105457 A JP 2001-180644 A

  By the way, this type of packaging container is intended for volume reduction during transportation, storage, etc., and by inserting the bottom of the other packaging container into one packaging container, a plurality of packaging containers can be It is assumed that they are stacked. However, when a plurality of the above conventional packaging containers are stacked up and down, they always come into contact with each other at the part where the peripheral walls overlap each other at any point. For example, in the case of the packaging container in which the thickened portions and the thin-walled portions are alternately formed in the circumferential direction, the peripheral walls are in contact with each other in the entire overlapping portion of the thickened portions. Moreover, in the case of the packaging container which formed the groove-shaped thin part, the mutual surrounding walls are contacting in the whole location other than a thin part. As described above, the packaging container that brings the peripheral walls into contact with each other in a wide range has a large sliding resistance between the peripheral walls, and it is difficult to pull out one or more from the stacked state. In particular, a packaging container having a thin peripheral wall requires a large force when it is pulled out because the other packaging container enters deep into one packaging container.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a packaging container in which one or a plurality can be easily pulled out from a stacked state.

  In order to achieve the above object, the invention of a packaging container according to claim 1 includes a bottom wall and a side wall erected from an inner peripheral edge of the bottom wall, and the side wall is farther from the bottom wall. Consists of a bottomed cylindrical container body that expands outward, and forms a thick wall portion at the bottom wall side end of the side wall that is thicker than the portion other than the bottom wall side end. In addition, the gist is that either the inner surface or the outer surface of the thick wall portion is inclined so as to be separated from the other as it approaches the bottom wall.

  The invention of the packaging container according to claim 2 is provided with a bottom wall and a side wall erected from the inner peripheral edge of the bottom wall, and has a tapered shape that expands outward as the side wall moves away from the bottom wall. It is composed of a bottomed cylindrical container body, and at the bottom wall side end of the side wall is formed a thick part thicker than the part other than the bottom wall side end, and the thick part and the The gist is that the thick part is formed so that the boundary with the part other than the thick part extends in parallel with the bottom wall.

  The invention of the packaging container according to claim 3 is the invention according to claim 1 or 2, wherein the thick portion is formed by raising the inner surface of the side wall to make it thick. The gist.

  The invention of a packaging container according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the container main body includes a leg portion protruding from a peripheral edge of the outer surface of the bottom wall. The main point is that

  The invention of the packaging container according to claim 5 is the invention according to claim 4, wherein the leg portion is inclined so that the outer surface thereof is separated from the inner surface of the leg portion as the distance from the bottom wall increases. The main point is that

  As described above in detail, according to the present invention, it is possible to provide a packaging container in which one or a plurality can be easily pulled out from a stacked state.

Hereinafter, an embodiment in which the present invention is embodied in a beverage cup will be described with reference to the drawings.
As shown in FIG.2 and FIG.3, the container main body 11 which comprises a drink cup was standingly arranged along the bottom wall 21 formed in disk shape, and the inner surface (upper surface) periphery of the bottom wall 21. As shown in FIG. It is formed in a bottomed cylindrical shape from the peripheral wall 22 which is a side wall. The container body 11 includes a leg portion 23 that protrudes along the outer peripheral surface (lower surface) of the bottom wall 21 and can be stably supported by the leg portion 23. ing. A bottom wall reinforcing portion 24 is provided at the central portion of the bottom wall 21 by projecting its wall surface into the interior of the container body 11 in a hemispherical shape (dome shape). The bottom wall reinforcing portion 24 improves the strength and rigidity of the lower portion of the container body 11. The legs 23 support the container body 11 and improve the strength and rigidity of the lower part of the container body 11 together with the bottom wall reinforcing part 24.

  The container body 11 is formed by an injection molding method using a synthetic resin such as polyethylene, polyethylene terephthalate, or polypropylene. And the cup for drinks is comprised by printing on the outer surface of the said container main body 11, sticking a film, etc., and carrying out beautification processing. In addition, the said cup for drinks may be comprised, without performing a beautification process etc. on the outer surface of the container main body 11. FIG. Moreover, since the said drink cup accommodates a liquid foodstuff, in addition to the said container main body 11, it may be provided with the cover body which obstruct | occludes the opening 11a.

  The peripheral wall 22 is formed in a tapered shape that expands outward as the distance from the bottom wall 21 increases. By forming the peripheral wall 22 into a tapered shape, the container body 11 is configured to be able to reduce the volume by stacking a plurality of the container body 11 up and down during transportation and storage. That is, as shown by a two-dot chain line in FIG. 3, by inserting the upper container body 11 into the lower container body 11, the pair of upper and lower container bodies 11 can be stacked to reduce the volume. It has become.

  On the inner peripheral surface of the peripheral wall 22, a plurality of support protrusions 25 having a substantially triangular pyramid shape are provided at the lower end portion thereof. These support protrusions 25 restrict the amount of insertion into the lower container body 11 from being excessive by locking the lower end of the upper container body 11 when the volume of the plurality of container bodies 11 is reduced. In addition, the upper container body 11 is supported. The upper end portion of the peripheral wall 22 is provided with a reinforcing portion 26 by forming the upper end portion in a step shape. A flange 27 that extends outward of the container body 11 along the upper edge of the reinforcing portion 26 is provided at the upper end portion of the reinforcing portion 26. The strength of the upper portion of the container body 11 is increased by the reinforcing portion 26 and the flange 27.

  As shown in FIG. 1, the thick wall portion 31 is formed at the lower portion of the peripheral wall 22, which is the end portion on the bottom wall 21 side, so that the thickness increases as it approaches the bottom wall 21. On the other hand, a thin portion 32 is formed on the upper portion of the peripheral wall 22 so as to have a constant thickness. The thick portion 31 is formed by raising the inner peripheral surface of the peripheral wall 22 to make it thick. That is, the inner surface of the thick portion 31 (hereinafter referred to as the thick portion inner surface 31a) is separated from the outer surface (hereinafter referred to as the thick portion outer surface 31b) as it approaches the bottom wall 21. Is so inclined. In contrast, the inner surface of the thin portion 32 (hereinafter referred to as the thin portion inner surface 32a) extends in parallel with the outer surface (hereinafter referred to as the thin portion outer surface 32b). In FIG. 1, the thickness of the peripheral wall 22 is exaggerated for easy understanding of the thick portion 31.

  The thick part 31 is formed at a constant height over the circumferential direction of the peripheral wall 22. Therefore, the boundary 33 between the thick portion 31 and the thin portion 32 formed between the thick portion inner surface 31a and the thin portion inner surface 32a on the inner peripheral surface of the peripheral wall 22 is parallel to the bottom wall 21, that is, the peripheral wall. 22 extends linearly in the circumferential direction. In addition, by raising the inner peripheral surface of the peripheral wall 22 to form the thick portion 31, the thick portion outer surface 31b and the thin portion outer surface 32b are connected in a flat shape at the same angle. Therefore, in this embodiment, the boundary between the thick portion 31 and the thin portion 32 does not appear on the outer peripheral surface of the peripheral wall 22.

  At the location where the bottom wall 21, the peripheral wall 22 and the leg portion 23 are connected at the lower part of the container body 11, the lower end of the thick wall portion 31, the peripheral edge of the bottom wall 21 and the upper end of the leg portion 23 are substantially the same thickness. Is formed. In addition, in the upper part of the container body 11, the thin portion 32, the reinforcing portion 26, and the flange 27 are formed to have substantially the same thickness.

Next, the operation of the beverage cup will be described below.
Now, the container body 11 of the beverage cup is formed by injection molding. At the time of this injection molding, the resin supply port (gate) of the mold is disposed at the center of the bottom wall 21. Here, when the container body 11 is formed by injection molding, if the distance from the gate to the flange 27 is L and the thickness of the peripheral wall 22 and the like of the container body 11 is t, L / t must be a constant value. There is a restriction that it must not. For this reason, conventionally, t is set according to L, and the injection pressure at the gate in the mold and the injection pressure at the location to become the flange 27 are almost the same value.

  On the other hand, in the container main body 11 of the embodiment, the thick portion 31 has a shape that increases in thickness as it approaches the bottom wall 21. As a result, the injection pressure continuously increases while the resin melted in the mold passes through the thick portion 31 and reaches the thin portion 32. For this reason, the injection pressure in the location which becomes the flange 27 in the mold is higher than the injection pressure in the gate. That is, when molding the container body 11 of the embodiment, the range from the center of the bottom wall 21 in the mold to the thick wall 31 can be assumed as a virtual gate. It is. Therefore, since the L is shortened and t can be reduced accordingly, the thin-walled portion 32 can be innovatively made thinner than the conventional one.

  In addition, the metal mold | die used by said injection molding is comprised from the female type | mold which shape | molds the outer surface part of the said container main body 11, and the male type | mold which shape | molds the inner surface part of the said container main body 11. FIG. Here, the thinner the thin portion 32 is, the narrower the molding space formed between the female mold and the male mold, so that the thin portion 32 may become defective due to misalignment of the mold. There is. In particular, as in the present embodiment, when the male mold is a fixed side with a vertically long drinking cup, the male mold has a thin and long shape, and a load is easily applied to the tip of the male mold, thereby easily shifting the position.

  On the other hand, in this embodiment, since the thick portion 31 is formed, the male tip has a reduced diameter, and the load applied to the tip can be reduced. In addition, when moving the female mold relative to the male mold during mold clamping, the margin formed between the male mold and the female mold at the tip of the male mold is larger than the other parts, so both types of collision or Contact can be avoided, and displacement of the mold is suppressed. Here, if the cup is low in height like a cup for containing pudding, yogurt, etc., that is, if it is possible to make the male mold thin but short, the above-described misalignment of the mold will be Hard to happen. That is, the above-described misalignment of the mold is likely to occur when the male mold has a thin and long shape, and the thickness is further reduced. And if it is a thing of the said embodiment, even if the height of the container main body 11 is 2 times or more with respect to the diameter of the said opening 11a, it is possible to suppress the position shift of a metal mold | die.

  Further, in the mold, the positional relationship between the male mold and the female mold is fixed before the synthetic resin flows into the thin-walled portion 32 because the synthetic resin quickly flows into the thick-walled portion 31. Also, the displacement of the mold is suppressed. Furthermore, since the synthetic resin flows uniformly in the mold due to the shortening of the L, the synthetic resin pushes out the air in the mold uniformly. For this reason, formation of air pockets in the mold can be suppressed, and molding defects of the container body 11, particularly molding defects of the flange 27 can be suppressed.

  On the other hand, in order to facilitate the molding by the above-described injection molding, the leg portion 23 is formed so as to increase in thickness as it approaches the bottom wall 21. Therefore, the amount of shrinkage of the synthetic resin after molding differs between the upper end portion and the lower end portion of the leg portion 23. And since the part which thickens shrink | contracts so much as the thickness is thick, the said leg part 23 may become a taper shape which spreads outward of the said container main body 11 after it forms from the said bottom wall 21. FIG.

  In the beverage cup, the container main body 11 can be discarded by reducing its volume by crushing after use. That is, the container body 11 is formed such that the thin portion 32, the reinforcing portion 26, and the flange 27 have substantially the same thickness as described above. And the thin part 32 is innovatively thin compared with the conventional one as mentioned above. Therefore, even if it is a conventional one, it is difficult to crush due to the structure provided with a flange or the like even if the wall thickness is reduced. Moreover, even if the thickness of the peripheral wall is partially reduced, if the flange or the like is approximately the same thickness as the bottom wall, the flange or the like retains its shape even if the peripheral wall is crushed. May return to its original shape. On the other hand, the container main body 11 is also thin in the reinforcing portion 26 and the flange 27 and deforms when crushed, so that the volume can be effectively reduced. The reinforcing portion 26 and the flange 27 have such strength and rigidity that the shape of the container body 11 can be maintained unless the user of the beverage cup or the like intentionally crushes.

  The beverage cup is reduced in volume by stacking the container body 11 up and down during transport, storage, and the like. At this time, as indicated by a two-dot chain line in FIGS. 1 and 3, a gap is formed between the peripheral walls 22 of the lower container body 11 and the upper container body 11. By forming this gap, the sliding resistance generated between the container main bodies 11 is reduced, so that one or a plurality of container main bodies 11 can be easily pulled out from the stacked state. .

  The gap is formed by providing the thick portion 31 below the peripheral wall 22. That is, in the thick portion 31, the thick portion inner surface 31a is inclined with respect to the thick portion outer surface 31b so as to expand inward of the container body 11 as it approaches the bottom wall 21. On the other hand, in the thin portion 32, the thin portion inner surface 32a and the thin portion outer surface 32b are parallel to each other. For this reason, when the upper container body 11 is inserted into the lower container body 11, the upper container body 11 is thicker before the thin wall outer surface 32b is brought into contact with the lower wall inner surface 32a of the lower container body 11. The part outer surface 31b is brought into contact with the thick part inner surface 31a of the container body 11 below. Accordingly, in the portion where the container main bodies 11 overlap with each other, the peripheral walls 22 do not come into contact with each other at the entire portion.

The effects exhibited by the above embodiment will be described below.
-According to the beverage cup of the embodiment, the thick part 31 is formed in the lower part of the peripheral wall 22 constituting the container body 11, and the thin part 32 is formed in the upper part. In the thick part 31, the thick part inner surface 31a is inclined with respect to the thick part outer surface 31b so as to be separated from the thick wall part 31 as it approaches the bottom wall 21. For this reason, when another container main body 11 is inserted and stacked inside the container main body 11, the thick portion outer surface 31 b of the container main body 11 contacts the thick portion inner surface 31 a of the other container main body 11. This avoids contact between the thin portions 32 of each other. Therefore, by forming a gap between the thin portions 32, it is possible to easily pull out one or a plurality of container bodies 11 from a stacked state.

  The boundary 33 between the thick wall portion 31 and the thin wall portion 32 extends linearly in the circumferential direction of the peripheral wall 22. For this reason, it is possible to eliminate an imbalance of sliding resistance, such as high sliding resistance in some places and low sliding resistance in other places between the stacked container bodies 11, and a plurality of them are stacked. One or a plurality of container main bodies 11 can be easily pulled out from the state.

  In addition, by making the boundary 33 linearly extend in the circumferential direction of the peripheral wall 22, the thick portion 31 can be formed at a constant height. For this reason, one container main body 11 can make the whole thick part outer surface 31b contact the whole thick part inner surface 31a of the other container main body 11. FIG. Therefore, compared with the case where a part of the thick part outer surface 31 b of one container body 11 is in contact with a part of the thick part inner surface 31 a of the other container body 11, It can suppress that the main body 11 is inclined and inserted. In addition, when one container main body 11 is inclined and inserted with respect to the other container main body 11, a load from one container main body 11 is added to the other container main body 11, and the container main body 11 is offset. There is a risk that problems such as distortion, breakage, etc. may occur.

  In addition, the thick portion 31 is formed to be thick by raising the inner peripheral surface of the peripheral wall 22. For this reason, the thin part outer surface 32b and the thick part outer surface 31b can be connected at the same angle, and the outer peripheral surface of the said surrounding wall 22 can be made into a flat surface. Therefore, when a beverage cup is beautified by attaching a label made of a film or the like or printing, the label, printing, etc. are prevented from becoming uneven, and the appearance quality is improved. be able to.

  A leg portion 23 is provided at the bottom of the container body 11. By providing the leg portions 23, the container body 11 can be stably supported and the bottom wall 21 can be reinforced.

  In addition, by providing the leg portion 23, when one container body 11 is inserted into the other container body 11, the thick portion outer surface 31 b of the one container body 11 is the inner surface of the thick portion of the other container body 11. Prior to contacting 31a, the end of the leg portion 23 can be brought into contact with the inner surface 31a of the same thick portion. For this reason, in the stacked container main bodies 11, a gap can be formed between the thick portions 31 in addition to between the thin portions 32, and the container main body 11 can be pulled out more easily. .

  In addition, when the container body 11 is formed by injection molding, the leg portion 23 may have a tapered shape that spreads outward from the container body 11 as the distance from the bottom wall 21 increases. In this case, when one container main body 11 is inserted into the other container main body 11, it is possible to reduce the contact area of the outer surface of the leg portion 23 with respect to the thick portion inner surface 31a. Therefore, it is possible to form a gap in a wider range between the stacked container bodies 11, and the container body 11 can be easily pulled out.

In addition, this embodiment can also be changed and embodied as follows.
-The packaging container is not limited to the beverage cup shown in the embodiment as long as it can package the contents contained therein, and for example, food containing ice cream, pudding, jelly, yogurt, chocolate, cookies, biscuits, etc. It may be a cup. Moreover, not only food but also toys, accessories, stationery, and the like may be used as contained items.

  -The container body 11 is not limited to a bottomed cylindrical shape, for example, a polygonal cylindrical shape such as a bottomed square cylindrical shape or a bottomed triangular cylindrical shape, a box shape such as a square box shape or a trapezoidal shape, a conical shape, a triangular pyramid shape, etc. A conical shape or the like may be used. In this case, for example, if the shape is a polygonal cylinder or box, the side wall is a square plate or a trapezoid. If the shape is a triangular pyramid or the like, the side wall is a triangle.

The thick portion 31 is not limited to the thickening of the inner peripheral surface of the peripheral wall 22 and may be thickened by increasing the outer peripheral surface of the peripheral wall 22.
As shown in FIG. 4A, only a part (upper part) of the thick part inner surface 31a is inclined so that the other part (lower part) of the thick part inner surface 31a and the thick part outer surface 31b are parallel to each other. You may form in. Alternatively, as shown in FIG. 4B, the thick-walled inner surface 31a may have an arc shape that curves outwardly of the container body 11 in a cross-sectional view.

  -As shown in FIG.4 (c), you may form the thick part 31 so that the boundary 33 of the thick part 31 and the thin part 32 may make a wave shape. That is, the thick part 31 is not limited to be formed at a constant height, and the height of the thick part 31 may be changed at predetermined intervals in the circumferential direction of the peripheral wall 22.

-You may comprise the said leg part 23 abbreviate | omitting.
The bottom wall reinforcing portion 24 may be omitted, and the bottom wall 21 may be formed into a flat plate shape.
-You may comprise abbreviate | omitting at least any one among the said reinforcement part 26 and the flange 27. FIG. Thus, even if either the reinforcing part 26 or the flange 27, or the reinforcing part 26 and the flange 27 are omitted, the container body 11 has the thick part 31, the bottom wall 21, and the leg part 23 having substantially the same thickness. Therefore, necessary and sufficient strength and rigidity can be maintained.

Further, the technical idea that can be grasped from the embodiment will be described below.
(1) A flange for reinforcing the container body is formed at the upper end of the container body, and the flange and the thin portion have the same thickness. Packaging container according to 1.

  (2) The packaging container according to any one of claims 1 to 5, wherein the container body is formed by injection molding.

Sectional drawing which shows the thick part of a container main body. The perspective view which shows a container main body. Sectional drawing which shows a container main body. (A), (b), (c) is sectional drawing which shows the thick part of another form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Container main body, 21 ... Bottom wall, 22 ... Perimeter wall as side wall, 23 ... Leg part, 31 ... Thick part, 33 ... Boundary.

Claims (5)

A bottom wall and a side wall erected from the inner peripheral edge of the bottom wall, the side wall comprising a bottomed tubular container body having a tapered shape extending outward as the distance from the bottom wall increases. A thick wall portion that is thicker than a portion other than the bottom wall side end portion is formed at the bottom wall side end portion, and either the inner surface or the outer surface of the thick wall portion is the bottom wall with respect to the other. A packaging container which is inclined so as to be separated as it approaches. A bottom wall and a side wall erected from the inner peripheral edge of the bottom wall, the side wall comprising a bottomed tubular container body having a tapered shape extending outward as the distance from the bottom wall increases. The bottom wall side end portion is formed with a thicker portion that is thicker than the portion other than the bottom wall side end portion, and the boundary between the thick portion and the portion other than the thick portion is the bottom wall. A packaging container characterized in that the thick part is formed so as to extend in parallel with the container. The packaging container according to claim 1 or 2, wherein the thick part is formed by raising the inner surface of the side wall to make it thick. The packaging container according to any one of claims 1 to 3, wherein the container body includes a leg portion protruding from an outer peripheral edge of the bottom wall. The packaging container according to claim 4, wherein the leg portion is inclined so that an outer surface thereof is separated from an inner surface of the leg portion as the distance from the bottom wall increases.

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