JPH09290847A - Food container covered with transparent lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food container covered with a transparent lid that is molded of a thin plastic sheet and well appealing on display with its voluminousness at laterals and available for being covered stably with the lid and for being stacked up. SOLUTION: A turned-up edge 2 on the periphery of a container main body 1 is formed with the upper edge 3 at the middle of each of four sides made low while the upper edge 4 at each of four corners made high with apparaent difference in height provided and with a slopelike part provided at each of positions between the upper edge 3 and the upper edge 4. Then, the middle part 7 of a partition 6 in the container main body is formed with its height being almost the same as the height of the upper edges 4 at the corners. The periphery of a lid 8 is turned down to form an accepting edge 9, and the upper edge 10 at the middle of each of four sides and the upper edge 11 at each of four corners are made to correspond to the above- mentioned edges of the container main body, and a protuberant face 13 having a side wall 14 rising from the inside of the upper edge 10 in a height slightly higher than the upper edge 11 at the corner is formed at each of four sides. Ribs 16 in the form of projected and recessed stripes reaching the end of the corner are provided at the upper face 15 at the corner surrounded by the protuberant faces 13 so that the bottom of a container can be fitted thereon when piling up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoformed plastic packaging container, such as a compressed air vacuum forming, which is used for selling foods while they are stored.

[0002]

2. Description of the Related Art As a bento container and various food containers, a compressed air vacuum-molded plastic container that can be put on sale while containing food is widely used. This kind of container is a wrapping film for storing food at a sales site. Other than those packaged in, the containers are used in order to prevent the entry of foreign matter and to stack the containers in several stages in the process of manufacturing, transporting, and displaying, so that they are used with a lid having a strength that can withstand the stacking.

[0003]

However, in such a lid, the lid cannot be thinned in order to obtain stacking strength, resulting in high cost. In addition, in order to make the food and the like look good when the food and the like are stored in a container and displayed in a store, it is desirable that the lid has a voluminous feel. However, in such a configuration, the lid becomes bulky, which is disadvantageous in terms of manufacturing, storage, transportation, and stacking for exhibition.

The present invention has been made in view of the above problems and has been made to improve the problems. A container using a transparent lid, which is molded by a plastic sheet (including a film, the same applies hereinafter) thinner than before. In addition to being able to stack, the lid can be stably attached during transportation (conveyance) in a closed state, exhibition, etc., and the upper edge of the side surface of the main body can be lowered, and conversely the lid of the corresponding portion. By increasing the height of the side part of
It is intended to provide a food container with a transparent lid, which gives the container a sense of volume and enhances the effect of displaying the product at the time of sale.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a container main body which is a folded edge in which an upper edge portion of a peripheral side surface is folded back to the outside, and an adherend whose peripheral edge portion is attached to the folded edge. A thermoforming container such as a compressed air vacuum forming consisting of a lid as an edge, wherein the outer main edge of the folding edge is approximately the same height all around the container body, and the upper edge of the folding edge in the middle of the side is Low, and the upper edge of the corner is formed high to form a clear height difference between both upper edges. While keeping the same height, lower the upper edge of the folding edge at the middle part of the side so that the upper edge of the deposition edge is in contact with the upper edge of the folding edge of the container body in the attached state. The upper edge of the lid is made high to provide a clear height difference between both upper edges, and the inner surface of the folding edge of the middle part of the side rises inward and the upper surface of the lid is inserted through the side wall. Form, the upper surface portion of the lid with the exception of reinforcing ribs is obtained by forming the food container transparent lid as having a configuration in which a virtual plane substantially flush connecting the corners on the edge of the lid. Further, in addition to the above configuration, the present invention raises the rising side wall portion of the middle portion of the side higher than the virtual plane to form a protrusion surface portion higher than the lid upper surface along the side of the upper surface, and the upper surface of the lid in each protruding surface portion. It is set so that the bottom of the stacked same-shaped containers fits in the part, and the upper edge part of the corner and the upper surface part facing inward of the lid are not provided with rising sidewalls and projecting surface parts and are transparent. It also forms the food container of the lid.

According to the above construction, even if the upper edge of the middle part of the side is formed low, the upper edge of the corner is formed high (deep), so that the lid is attached to the container body. Since the condition is stabilized, it is possible to prevent the lid from being easily detached during transportation, packaging work, display work, etc. Since the sheet is stretched greatly, the sheet thickness becomes thin, but since the middle part of the side is shallow, it is possible to prevent overstretching and it can be used sufficiently even if the lid is molded using a relatively thin sheet. Can withstand. Moreover, the middle part of the side of the lid is low, while the rising side wall part inside is high, so that the container relatively creates a volume feeling of the external appearance, enhancing the visual appeal, and at the time of sale. The display effect of the food container containing the food can be enhanced. Since the corners are high (deep) in configuration, it is possible to prevent the corners of the lid from being drawn inward of the top surface of the lid, and to enhance the stacking strength as well as the stability of attachment of the lid. If a protrusion is formed along the edge inside the rising side wall of the lid, when the containers are stacked in multiple stages, the lid is stable and the bottom of the upper container is the upper surface of the lid inside the protrusion. Since it can be fitted in the part to prevent lateral slippage, stable stacking is possible. The above function is more effective when the upper surface portion of the lid (main portion of the upper surface excluding the contact portion with the reinforcing ribs and the container body portion) is formed to be substantially flush with the virtual plane connecting the upper edges of the corners of the lid. It will be effective.

Further, according to the above construction, in the state where the lid is attached to the container body, the outer lower edge of the lid attachment edge does not engage with the outer lower edge of the folding edge of the container body in a concave and convex manner. Can be formed as. For example, the lower edge of the lid and the lower edge of the container main body may be formed to have substantially the same height, or the lower edge of the lid may be formed to stop at a slightly upper position. By doing this, it is possible to suppress the expansion of the plastic sheet on the folded edge of the lid, so that it is possible to use a thinner sheet, it is easier to open the lid, and the lid is damaged when opening. There is no risk of spilling food, and there is no risk of spilling part of the food due to the recoil when the lid is opened. When the molded lid is put in a cardboard box or the like for transportation and storage, a large number of lids can be stacked and stored by stacking the entire upper and lower ends thereof, and the packaging efficiency can be improved. However, as in the conventional case, the outer lower edge of the attached edge of the lid is hung slightly longer than the outer lower edge of the folded edge of the container main body, and an inward protrusion is formed at the tip end of the lid edge of the container. It may be formed so as to engage with the folded lower edge of the main body.

In the above structure, the upper surface of the lid, which extends from the upper edge of the corner toward the inside of the lid, has a flat shape, and the uneven rib extending from the upper surface of the lid toward the outside of the corner extends to the upper end. Alternatively, it can be formed by turning to the outer side of the edge, or a concave surface that is slightly recessed downward can be formed on the upper surface portion inside the upper edge of the corner, or both of these configurations can be provided. Can be formed. In addition, the upper surface of the lid is formed substantially at the same height as the upper edge of the corner, and a partition wall or an upward projection is formed inside the container body, and at least a part of the partition wall or the upper surface of the projection is formed. It can be formed so that a part of the upper surface of the lid is in contact with each other. In this case, the upper surface portion of the lid which comes into contact may be partially formed in a concave shape.
As an example of preferable dimensions, the folded edge of the middle portion of the side of the container body is formed so that the outer lower edge and the upper edge thereof are 2 mm or more, and the upper edge of the corner portion is 3 mm from the upper edge of the intermediate portion. The protrusion is formed so as to be higher than the above, and the projecting surface formed in the middle part of the side is formed so as to be higher than the upper edge of the corner and to project at a height within 7 mm from the upper surface of the lid. The concave surface formed on the upper surface portion inside the upper edge portion is preferably formed as a shallow concave surface within about 2 mm.

By making the corners flat and forming the uneven ribs or the slightly concave surfaces, it is possible to more reliably prevent the corners from being drawn inward of the upper surface of the lid, and to stabilize the attachment of the lid. In addition to the above-mentioned structure, by making a part of the partition wall or the projection and the upper surface part of the lid in contact with each other, the strength against stacking of the containers can be further strengthened, and a thin plastic sheet can be used. Even if the lid is molded, the stability of the lid deposition becomes even higher.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the lid and the container body in a separated state, FIG. 2 is a partial front view thereof, FIG. 3 is a cross-sectional view of an intermediate portion of the side, FIG. 4 is a cross-sectional view of a corner portion, and FIG. 5 is a top view of the corner portion. For example, the container has a horizontal and vertical size of 150 to 450 m.
Those having a size of about m and a depth of about 20 to 45 mm are suitable.

The container body 1 is formed by folding back the upper edge of the peripheral side surface to the outside to form a folding edge 2, and the outer lower edge which is the folding end has substantially the same height all around and the folding of the middle portion of each side. The upper edge 3 of the edge is formed low, the corner from the corner to a part slightly on the side is curved, and the upper edge 4 is formed high with a clear height difference. An inclined step portion 5 is formed at the folded edge between the upper and lower portions, a partition wall 6 is formed in the storage space of the container body, and at least the central portion 7 is appropriately long and the upper edge portion 4 of the corner portion is formed. It is formed almost at the same height. It is preferable that the upper and lower folding edges of the folding edge of the middle portion of each side and the outer lower edge thereof be 2 mm or more. If this vertical difference is eliminated, the container body is likely to bend and it becomes difficult to maintain the strength of the container. The height of the upper edge portion 4 of the folded edge of the corner is preferably set to be 3 mm or more higher than that of the upper edge portion 3 of the middle portion of each side. By providing this height difference, the strength of the container body is increased and the lid is closed. The closed state of can be stabilized. The sheet thickness of the container body is arbitrary and may be either a non-foamed sheet or a foamed sheet. The form of the partition wall is not limited at all. For example, instead of the partition wall, a protrusion rising from the bottom surface may be used. The ribs, patterns, and other configurations are not limited. Also,
The figure shows a rectangular container in plan view, but other polygonal shapes may be used. In the case of a circular container, it is possible to form three or four corner portions at equal intervals and a side intermediate portion between them.

The lid 8 is formed by bending the lower edge of the entire circumference to the outer lower side to form an adhered edge 9, and the outer lower edge of the lid 8 has substantially the same height around the entire circumference and is adhered in the adhered state. Upper edge part 10 of each side middle part of edge 9
Is low, the upper edge 11 of the corner is high, and an inclined step portion 12 is formed therebetween, both of which are attached in contact with the upper edge portions 3 and 4 and the step portion 5 of the folded edge of the container body. As described above, the outer edge of the adhered edge 9 is formed at the same height as the outer lower edge of the folded edge 2 of the container body, or at a length that stops slightly above or extends slightly downward. Further, from the inside of the upper edge portion 10 of each side intermediate portion, a rising surface portion 13 which rises slightly higher than the height of the upper edge portion 11 of the corner and has a rising side wall portion 14 is formed along the side and has a proper width. And each protrusion 13
The upper surface portion 15 of the inner lid is flat except for the reinforcing ribs, and the projecting surface portions 13 formed along the respective sides are stacked in multiple stages on the upper surface portion 15 inside the lid surrounded by these. At this time, the bottom surface of the container body 1 is set so as to be fitted into the container body almost exactly so that the respective projecting surface portions 13 can prevent the lateral displacement of the bottom portion of the container which is overlaid. The rising side wall 1
4 and the projecting surface portion 13 may be formed as a flat surface, but the surface shape may be arbitrary such as a continuous concavo-convex surface, and the projecting surface portions 13 along the sides may be formed as a series of projecting surface shapes. Alternatively, it may be formed as two or more projecting surface portions in a divided or separated state.

Further, the upper edge portion 11 of the corner and the upper surface portion 15 near the upper edge toward the inside of the lid are formed into a substantially flat surface, and the upper surface portion 15 has, for example, a stripe shape along the contour of the lid. The reinforcing ribs may be provided or a slight concave surface, for example, a concave surface having a diameter or a vertical and horizontal width of about 2 cm or less may be partially provided, but the upper surface portion 15 near the corner is flat and the corner 11 has
Plural concavo-convex rib ribs 16 of appropriate length are formed in a flat upper surface toward the outside of the corner up to the corner end of the upper surface. It can be extended to an arbitrary position between the outer and lower ends of the folded edge. The thickness of the plastic sheet for molding the lid 8 can be made thinner than that of a conventional lid. For example, a small lid has a smaller thickness and a large lid has a smaller thickness than a small lid. Thicken, but the range is 0.1
The thickness is preferably about 2 to 0.25 mm, and the transparent sheet can be formed under pressure or vacuum. The projecting surface portion 1
3 is preferably formed so that the bottom of the container body 1 is higher by about 2 to 7 mm than the upper surface portion 15 of the lid with which the bottom surface of the container body 1 can come into contact. If the height is made higher, the irregularities on the periphery of the lid become too deep, and the sheet thickness must be increased accordingly, which is not preferable. If it is lower, the bottom of the stacking container is likely to be displaced, and it becomes difficult to maintain the stacking stability. The planar contour shape of the lid matches the shape of the container body, but the ribs, patterns, and other configurations are not limited. Further, similarly to the above, whether it is a quadrangle, a polygon, or a circle in plan view is arbitrary.

In the above description, the contact position between a part of the partition wall 6 of the container body 1 and the upper surface portion 15 of the lid 8 can be set to an appropriate height, for example, the partition wall or the projection. It is also possible to form the contact portion of the lid lower than the folded edge, and recess the portion including the contact portion of the lid corresponding thereto so as to be the lower position. When the abutting portion of the lid is recessed, it is preferable that the diameter is about 2 cm or less if the top view is circular and the side is about 2 cm or less if it is quadrangular.

When the lid 8 having the above-mentioned structure is attached to the container body, as shown in FIGS. 2 to 4 and FIG. 8, the upper edge 10 of the middle portion of the side of the lid 8 is the side of the container body 1. It is attached to the upper edge 3 of the intermediate portion, the upper edge 11 of the corner of the lid 8 is attached to the upper edge 4 of the corner of the container body 1, and the inclined step portion 12 is attached to the same 5. Further, the upper edge of the central portion 7 of the partition wall 6 of the container body is brought into contact with the central portion of the upper surface portion 15 of the lid 8 so that the attachment is reliably performed. The lid 8 is attached to the upper edge 11 of each corner with a sufficient height (depth) on the upper edge 4 of each corner of the container body 1. Even if the end is not engaged with the outer lower edge of the folded edge 2 of the container body 1, there is no risk of accidental disengagement, and when the containers are stacked in multiple stages, the central part of the lid is the partition wall. Since it is supported by the central portion 7 (the protrusion in the case of a protrusion) of 6, there is no recess, and since each corner is sufficiently adhered as described above, the upper surface portion 15 of the lid is It is possible to prevent the lid surface from being pulled toward the center due to some bending (concave),
Does not cause the lid to come off. The ribs 16 prevent the above-mentioned retraction even more reliably.

Therefore, even if the lid 8 is formed of a sheet sufficiently thinner than the container body 1, a stable lid function can be exhibited. Since the lid 8 is not engaged with the container body, the lid opening operation is easy and simple. However, it is also possible to make it the structure made to engage. Further, since the projecting surface portion 13 is formed inside the upper edge portion 10 of the middle portion of the side through the rising side wall portion 14, the three-dimensional shape of the lid becomes relatively large, and the inside of the container becomes easy to see, and the volume feeling of the container is increased. Since the number of products increases, the display appeal effect as a product can be enhanced. Moreover, the shape retention of the lid 8 can be further enhanced by forming a step between the upper edge portion and the upper surface portion and combining with the configuration of the corner portion.

FIGS. 6 and 7 show an embodiment different from the above, in which the upper edge 11 of the corner of the lid 8 is formed to have substantially the same height as the upper surface 15 as in the above embodiment. However, in the inner portion of the upper edge portion 11, the upper edge portion 11 and the upper surface portion 15
A concave surface 16A that is slightly recessed downward is formed with a step. It is desirable that the recess be within 2 mm from the viewpoint of the reinforcing effect. Also in this configuration, the step on the outer side of the concave surface 16A prevents the upper surface portion from bending and realizes the stability of the lid attached state similar to the above.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a transparent lid food container according to an embodiment of the present invention.

FIG. 2 is a partial front view showing a part of the container of FIG. 1 omitted.

3 is a vertical cross-sectional view taken along line III-III of FIG.

4 is a vertical cross-sectional view taken along line IV-IV of FIG.

5 is a partial top view of a corner of the lid of FIG.

FIG. 6 shows another example of FIG. 5 and is a partial top view of a corner portion of the lid.

7 is a partial vertical cross-sectional view taken along line VII-VII of FIG.

FIG. 8 is a vertical cross-sectional view taken along the line VIII-VIII of FIG.

[Explanation of symbols]

 1 Container Main Body 2 Folding Edge 3 Upper Edge of Middle Side 4 Upper Edge of Corner 5 Step 6 Partition Wall 7 Center Part 8 Lid 9 Attached Edge 10 Upper Edge 11 of Side Middle 11 Above Corner Edge portion 12 Step portion 13 Projection surface portion 14 Standing side wall portion 15 Upper surface portion 16 Rib line 16A Concave surface

Claims (5)

[Claims] 1. A thermoforming container such as a compressed air vacuum forming comprising a container main body having a folded edge formed by folding back an upper edge portion of a peripheral side surface to the outside and a lid having a peripheral edge portion adhered to the folded edge. The outer lower edge of the folding edge is approximately the same height all around the circumference of the container body, and the upper edge of the folding edge in the middle of the side is low and the upper edge of the corner is high. It is formed with a structure in which a clear height difference is provided between the upper edge portions, and the lid has an outer lower edge of the adhered edge having substantially the same height all around,
In the attached state, lower the upper edge of the folded edge in the middle part and raise the upper edge of the corner so that the upper edge of the attached edge is in contact with the upper edge of the folded edge of the container body. By forming a clear height difference between both upper edge parts, the upper surface of the lid is formed inside the upper edge part of the folded edge of the middle part of the side through the rising side wall part, and the upper surface part of the lid except the reinforcing rib is A food container with a transparent lid, which has substantially the same plane as a virtual plane connecting the upper edges of the respective corners of the lid. 2. A rising side wall portion at a middle portion of the side is raised higher than the virtual plane to form a projecting surface portion higher than the lid upper surface along the side of the upper surface, and the projecting surface portions inside the projecting surface portions are stacked on the upper surface portion of the lid. The same-shaped container is set so that the bottom fits thereinto, and the upper edge of the corner and the upper surface portion facing inward of the lid are not provided with rising side walls and projecting surface portions. 1. A transparent lid food container according to 1. 3. A lid upper surface portion extending from the upper edge portion of the corner portion toward the inside of the lid is flat, and an uneven rib having a proper length extending from the lid upper surface toward the corner portion is formed at least up to the upper surface end portion. Or a concave surface having a proper width slightly depressed downward on the upper surface portion inside the upper edge portion of the corner, or having both of these configurations. Transparent lid food container. 4. An upper surface of the lid is formed substantially at the same height as an upper edge of a corner, and a partition wall or an upward projection is formed inside the container body, and at least a part of the upper surface or the projection of the partition wall is formed. The food container with a transparent lid according to any one of claims 1 to 3, wherein the top surface of the lid and a part of the top surface of the lid are formed so as to be in contact with each other. 5. The container body is formed such that the folded edge of the middle portion of the side is 2 mm or more between the outer lower edge and the upper edge, and the upper edge of the corner is 3 mm or more from the upper edge of the middle portion of the side. When it is formed so as to be higher and a projecting surface portion is formed in the middle portion of the side, the projecting surface portion is formed so as to be higher than the upper edge of the above-mentioned corner and project within 7 mm above the upper surface of the lid. The food container with a transparent lid according to any one of claims 1 to 4, which has the following structure.