JP2001315786A - Packaging container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a packaging container to save resources and to be recycled, enable a sufficient clearance of stacked flanges arranged at main bodies of a number of stacked packaging containers to be kept irrespective of their thin walls and further enable the packaging containers to be dropped positively one by one onto a downstream processing line by a robot. SOLUTION: This packaging container is characterized in that the same is comprised of a container main body and a lid made of material such as natural plant fiber that can be recycled; a stepped portion below the container main body between a product storing portion having reduced diameter at side walls and an opening portion is provided with at least three position setting protrusions protruded outwardly at a predetermined position of the lower product storing potion from a position of the stepped portion; and further the outside part of each of the protrusions is abutted against the inside part of the opening of the lower packaging container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container and, more particularly, to a recyclable thin paper packaging container.

[0002]

2. Description of the Related Art A packaging container such as natto, which is currently used today, has a rectangular box-shaped container body 26 as shown in FIG.
And a lid (not shown) that can be folded at a fold portion. The main body 26 includes a bottom portion 23 and a step portion 2.
It has a side wall 22 consisting of an upper part 22 'and a lower part 22 "which are inclined downward by reducing the diameter through 2"'. There are side walls 22.
The side wall 22 has a merchandise storage section at a lower part 22 ″ and an opening 25 as an upper part 22 ′ around the upper part of the storage part. 24. One of the four flanges is connected to the lid at the fold, but this lid is omitted in the drawing.

[0003] The packaging container has a thick wall R formed of foamed styrene, and in particular, since the opening is thick, the upper container body 26 of the upper container body 26 is placed on the upper end 27 of the lower container body 26. The outer side of the step portion 22 "" is placed, and a gap is maintained between the flanges H. That is, by inserting a fork-shaped robot arm (not shown) into this gap, a lower belt conveyor or the like is inserted. The packaging containers are intermittently dropped one by one onto a line (not shown), and a certain amount of natto is deposited in the next step, and the opening 25 is particularly thick in this packaging container. Since it is made of meat R, an opening 2 is provided between the flanges of the stacked packaging containers.
With a sufficient thickness of 5, the outer side of the step 22 "'of the upper container body can be placed on the upper end 27 of the opening 25 of the lower container body 26 described above. Although the gap H is open, this also has the following problems.

[0004] Firstly, harmful gases such as dioxin are generated during incineration of garbage because the material is made of foamed styrene, and there is a danger in food hygiene when recycling discarded containers. A problem arose.

[0005] Secondly, wooden materials such as paper have a global environmental problem of cutting down forests in a wide area.

The third problem is that, for some reason, the stacking positions of the lower and upper container bodies are shifted up and down, front and rear, and left and right, so that a gap for inserting a fork between the upper and lower flanges cannot be maintained. Inconvenience that two or more containers fall on the conveyor at one time is considered.

[0007]

Therefore, instead of styrofoam, a non-wood natural plant fiber such as reed is used, and a thin-walled packaging container is molded by molding as shown in FIG.
However, there is a limit in increasing the wall thickness because it is a vegetable fiber, and even if it is thick, there is a drawback that it takes a long time in the process and increases the cost. Above all, since the thickness of the container is thin, as shown in FIG. 4, the upper end of the opening of the lower container body (at the base of the flange) is bordered by the outside of the opening of the upper container body. Can not be placed on a certain step,
The step between the upper layer and the lower layer fell close to each other, and the gap h between the flanges became very small, resulting in a fatal defect that the foam of the robot arm could not be inserted sufficiently (see FIG. 4). The figure numbers are the same as in FIG. 5).

In view of the above circumstances, the inventor tried to make only the opening 25, which is the upper portion 22 'of the side wall of the reduced diameter container body, thick. However, the packaging container of this embodiment has a sufficient gap between the flange portions 24 as in FIG.
The technique of increasing the thickness of only the side wall opening 25 is not only difficult to produce a uniform quality with a plant fiber mold, but also the position of the vertically stacked container body is shifted as in FIG. Although the one flange part 24 which the whole leaned and climbed up has a large gap extending diagonally upward,
It has been found that the flange portion 24 located at the opposite symmetrical position overlaps the lower-layer flange portion, so that there is a defect that a gap is eliminated.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a packaging container having sufficient rigidity for accommodating commodities between container bodies capable of being laminated even if the thickness of the container is small. It is an object of the present invention to provide a packaging container capable of sufficiently stacking the container bodies by not only inclining the container body but also tilting the container body sufficiently, not to mention tilting the container body.

[0010] Another object of the present invention is to provide a recyclable thin-walled material for packaging containers that is free from food hygiene problems and has no pollution.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned object, and its gist is to provide a container body having a bottom and a lid, and the container body has a side wall whose diameter is reduced downward. A product storage portion that is inclined and formed with an opening that is opened by placing a step on the upper periphery of the storage portion, and a flange portion that overlaps with the lid body is formed outside the opening portion, A packaging container for stacking a large number of container bodies, dropping the container bodies one by one from the stacked state onto a traveling line such as a conveyor below, and then dropping the products into the product storage section, wherein the containers are recycled. It is made of a possible thin material, and at least three positioning projections are provided from the stepped position of the side wall to a predetermined position of the lower product storage portion so as to protrude to the outside of the side wall corresponding to the concave portion provided inside the storage portion. By the lower layer The positioning protrusion is placed on a concave portion of a certain container body to prevent the downward movement, and the positioning protrusion is brought into contact with the inside of the opening of the lower container body to move the container body back and forth. A packaging container characterized in that a sufficient gap can be formed between the lower layer container main body and the laminated flange portion by being set to be immovable right and left.

In this case, the thickness of the opening in the upper layer is made thicker than that of the other part of the container body, so that the positioning projection is placed on the concave portion and the container body of the lower layer is formed. The container bodies of the upper and lower layers can be stably stacked also on the peripheral step portion.

In another aspect of the present invention, the packaging container is a natural vegetable fiber which is a thin non-wood fiber.

Further, the state in which the outside of the positioning projection immovable with the lower layer container main body is in contact with the inside of the opening of the container main body is such that the outer side and the inner side have a planar gap without any gap. It is preferable to be in a positioned state from the viewpoint of stability of the laminated state.

Further, as another invention of the present invention, the cover is formed with a reinforcing rib fitted into an opening of the container body, and the step is formed at a height to receive the reinforcing rib. It is characterized by.

Still further, as still another invention of the present invention, the container main body is of a rectangular box shape separated from the lid, and the positioning projections at that time are provided on four sides of a side wall, respectively. There is a feature.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS If the container main body and the lid are laminated with a sufficient gap formed between the flange portions in the laminated state, the lid and the container main body are not necessarily integrated. However, for a series of operations such as opening the lid as a packaging container, depositing the product in it, and then closing the lid, the lid is connected to the flange of the container body and the perforation etc. It is preferable that they are connected so as to be foldable.

As the recyclable thin material having no pollution, a material obtained by pressing a previously formed paper sheet or a material formed by using upper and lower molds by using recycled pulp can be considered. The use of natural plant fiber as a non-wood fiber such as reed or sugarcane scum (bagasse) has the advantage that there is no problem of environmental hormones, no harmful gas is generated when burned, and above all, it can be produced at low cost.

The above-mentioned container body may be of various box shapes such as a flat circular shape and a polygonal shape, but a container having a square side wall is generally used because it does not take up a place for display. The reinforcing rib provided at a position corresponding to the opening of the container body of the lid is projected upward in a square shape with the lid opened (FIG. 1), and is provided on the side wall together with the projection. The positioning projections and the steps are also tapered so that the upper mold can be pulled upward from the lower mold of the mold.

The thickness of the container body and the lid is about 2.5 m / m in the case of the conventional foamed styrene, but in the present invention, the thickness is 1 m / m or less, preferably about 0.5 m / m. Can be used.

Further, the height of the positioning projection projecting from the step position to the lower predetermined position is substantially the same as the height of the opening above the step, and furthermore, the flange at the upper end of the opening is provided. This is preferable in that the outer side of the step at the lower end of the opening is placed at the base of the opening, and the height of the gap between the upper and lower flanges is approximately equal to the height of the opening.

[0022]

In the present invention, it should be noted that the positioning projection is made immovable in relation to the lower container body because the outside of the projection is inclined downwardly from the opening of the lower container body. Abuts on surface (eliminates gaps)
This restricts the container body from moving forward, backward, left and right. Further, the fact that the protrusion does not fall into the concave portion inside the protrusion of the lower container body means that the positioning protrusion provided at the same height position of the side wall whose diameter is reduced downward,
By projecting outward from the inside of the side wall (by the upper mold and lower mold of the mold, etc.), the outer diameter of the outer convex part is larger than the size of the inner concave part (outer diameter) by the thickness between the convex part and the concave part. Therefore, when a container body made of the same type is stacked on the upper layer of the container body on the lower layer, the positioning projections as projections on the outer side of the side wall of the container body of the upper layer are positioned on the lower layer. As long as the container is not pushed into the recess at the same position of the body by using the elasticity of the container, the protrusion will stop on the recess, and thereby the flange of the container body in the upper layer by the height of the recess. A gap will be created between the flanges of the lower layer. The fork claws of the robot arm are inserted into the gaps between the flanges between the opposed flange portions of the container body, and the forks are moved downward, whereby the packaging containers can be reliably dropped one by one on the line. .

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a packaging container according to the present invention will be described with reference to an overall perspective view of FIG. 1 and a partial vertical cross section of FIG. 1 in which only two container bodies are stacked (FIG. 2). , FIG. 3).

In the packaging container A of the present invention, the container body 1 and the lid 12 are made freely foldable by perforations 10 and the opening 4 which is thicker than the other side of the container body 1 is tapered downward. The main configuration is made thinner and the other container bodies are integrally formed with the same thin thickness.

The container body 1 comprises a square bottom 9 and a side wall 2 which expands upward from each side of the bottom. The side wall 2 has a product storage section 5 and a step 8 around the upper side of the product storage section 5. An opening 4 is provided through the opening 3 and the flange 3 is provided outside the four sides of the opening 4. The whole packaging container A is made of bagasse as a raw material, is formed in a wedge shape having an opening of 0.8 to 0.6 m / m, and is formed with a substantially uniform thickness of 0.5 m / m including other portions.

On the lower surface of the lid 12, there is a rectangular annular projection 11 fitted along the inner periphery of the opening 4 of the container body 1, and the upper surface of the lid opposite to the projection 11 has the projection 11 formed thereon. A concave groove (not shown) is formed by molding.

By the way, from the position of the step portion 8 to the lower position (the same length as the opening portion 4), the four side walls 2 which are inclined with decreasing diameter toward the lower side have a steeper angle than the tapered surface of the side wall 2. (Almost vertical), a positioning projection 7 projecting outward from the inner recess 6 is provided. The projection 7 is a molding die having a concave lower die and a convex upper die, leaving a predetermined thickness between the dies. Then, the lower mold is formed as a protrusion on the outer surface of the side wall 2, and the protrusion of the upper mold corresponding to the recess of the lower mold is formed as the recess 6 on the inner surface of the side wall 2. Then, the convex portion 7 and the concave portion 6
As described above, the side wall 2 is located between the concave and convex molds.
The outer diameter of the projection 7 is smaller than that of the recess 6
When the two container bodies 2 are stacked in two layers, the projections 7 of the upper container body are fitted into the recesses 6 of the lower container body 2. Instead, it will be placed on top of it. Therefore, this means that the projection 7 of the other packaging container is placed on the concave portion 6 of one packaging container among the many molded by the concave and convex portions of the same molding die (to prevent the entire concave portion 6 from being closed). 1) By being placed, the size of the gap between the flange portions 3 of the container body 2 that are vertically stacked by the height of the concave portion itself of the side wall 2 is determined. of course,
Each of the convex portions 7 and concave portions 6 provided on the four sides of the side wall 2 has the same height between the convex portions and the concave portions. In addition, the convex part 7 and the concave part 6 do not need to be present in all of the four side walls 2. If the number is three or more, the container main body 1 can be stably placed, which means that the container main body has a round pot shape. The same can be said for a thing. However, when the lid 12 is separate from the container main body 1, the lid 12 is not restricted by one side (perforation 10 side) as in the relation between the integral lid and the container main body. It is preferable that one is provided on each of the four side walls so as not to play back and forth and left and right.

By providing a step portion 8 between the opening 4 of the container body 1 and the product storage portion 5, the strip-shaped projection 11 of the lid 12 can be stably fitted into the step portion 8. And the function as a reinforcing rib of the container body 1 is provided. By forming the concave portion 6 on the inner surface of the side wall 2 below the step portion 8, the molding of the container body 1 is facilitated. At the same time, the recess 6 can also be formed simultaneously and clearly below the step 8 on the inner surface of the product storage section 5 of the side wall 2.

Further, by positioning the positioning projections 7 provided at least at three places of the upper container body 1 on the inner side surface of the opening 4 of the lower container body 1, the container body stacked on the upper layer and the lower layer is provided. To move left, right, front and back.

The concave and convex ribs 1 are provided on the bottom 9 of the container body 1.
3 is provided for reinforcement.

Although not described in the above embodiment,
When the thin material of the present invention is a natural plant fiber, the inner surface of the container body may be coated or laminated with a water-resistant thin film having no problem on food so that water does not permeate.

[0032]

According to the present invention, there is provided a packaging container comprising a container body having a bottom and side walls, and a lid, wherein a plurality of container bodies are stacked and dropped one by one on a line. From a recyclable thin material such as natural plant fiber, from the step position at the border of the product storage section on the side wall and the opening above it to the predetermined position of the product storage section below,
By providing at least three positioning projections that protrude to the outside of the side wall corresponding to the recesses of the product storage portion, when a plurality of packaging containers are stacked, the plurality of packaging containers are placed above the recesses of the lower (lower layer) packaging containers. Since the convex part of the (upper layer) packaging container is placed, it is possible to prevent the downward movement of the upper packaging container, and therefore, the gap between the upper and lower packaging container flanges is kept constant. Can be kept.

In addition, at least three positioning projections of the upper packaging container are in contact with the inside of the opening of the lower packaging container, thereby restricting the mutual movement of the stacked packaging containers from front to back and from side to side. Accordingly, there is an effect that the stacked packaging containers are prevented from being inclined and a sufficient gap is maintained in the gap between the flanges.

That is, even if the packaging container of the present invention is made of a recyclable thin material, the spacing between the packaging containers that are still sufficiently laminated, in other words, the spacing between the flanges can be sufficiently maintained. Provided a packaging container that can be dropped one by one into the lower line.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a packaging container according to the present invention.

FIG. 2 is a partial longitudinal sectional view of a positioning projection [XX] in a state where two container bodies of FIG. 1 are stacked.

FIG. 3 is a partial longitudinal sectional view of [YY] other than a positioning projection in a state where two container bodies of FIG. 1 are stacked.

FIG. 4 is a partial cross-sectional view showing a state in which all three containers of a packaging container made of a thin material until the present invention is completed are stacked.

FIG. 5 is a partial cross-sectional view of a conventional packaging container in which three container bodies are stacked.

[Explanation of symbols]

 A Packaging Container 1 Container Main Body 2 Side Wall of Container Main Body 3 Flange of Container Main Body 6 Recess Provided Inside Side Wall 7 Protrusion Provided Outside Side Wall 8 Step 9 Bottom of Container Main Body 12 Lid

Claims (5)

[Claims] 1. A container main body having a bottom portion and a lid, wherein the container main body is opened by placing a step portion around the upper side of the storage portion and a product storage portion which is inclined by reducing its side wall downward. The container body is formed with an opening, and a flange portion is formed outside the opening to overlap with the lid.The container bodies are stacked in large numbers, and the container bodies are individually placed one by one from the stacked state. A packaging container that falls on a traveling line and then drops the product into the product storage portion, wherein the container is made of a recyclable thin material and extends from a step position of the side wall to a predetermined position of a lower product storage portion. By providing at least three positioning projections protruding outside the side wall corresponding to the recesses provided inside the storage section,
The positioning protrusion is placed on the concave portion of the container body in the lower layer to prevent downward movement, and the positioning body is brought into contact with the inner side of the opening of the lower container body so that the container body is A packaging container characterized in that a sufficient gap can be formed between the lower-layer container main body and the laminated flange portion by being set to be immovable in the front-rear and left-right directions. 2. The packaging container according to claim 1, wherein the thickness of the opening is thicker than the other part of the container body. 3. The packaging container according to claim 1, wherein the recyclable thin material is a natural vegetable fiber that is a non-wood fiber. 4. The container according to claim 1, wherein said lid is formed with a reinforcing rib fitted into an opening of said container body, and said step is formed at a height to receive said reinforcing rib. The packaging container according to any one of the above. 5. A container according to claim 1, wherein said container main body has a rectangular box shape separated from said lid, and said positioning projections are provided on four sides of a side wall, respectively. A packaging container according to any one of claims 1 to 4.