JP2967865B2 - Food container with transparent lid - Google Patents

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 pressurized vacuum molding, for selling food while storing the food.

[0002]

2. Description of the Related Art As a lunch box or various food containers, a pressurized and vacuum formed plastic container which can be used for sale while containing food is widely used. This type of container is used for storing food at a sales site and wrapping film. Except for those that are packed in containers, foreign materials are prevented from being mixed, and the containers are stacked in several stages in the process of manufacturing, transporting, and displaying.

[0003]

However, such lids cannot be made thinner in order to increase the stacking strength, resulting in higher costs. In addition, when foods are stored in a container and displayed at a store, it is desirable to give the lid a voluminous feel in order to make the foods and the like look good. However, in such a configuration, the lid has a bulky shape, which is disadvantageous in terms of production, storage, transportation, stacking for display, and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems by solving the above problems. A container formed of a thinner plastic sheet (including a film, hereinafter the same) and having a transparent lid is used. Can be stacked, and the lid can be stably adhered for transportation (conveyance) in a closed state, display, etc., and the upper edge of the side of the main body is lowered, and conversely, the lid of the corresponding part By increasing the height of the side of the
It is an object of the present invention to provide a food container having a transparent lid, which gives the container a sense of volume and enhances the display appeal at the time of sale.

[0005] In order to solve the above problems, the present invention relates to a thermoformed container such as a pressurized vacuum forming method comprising a container body and a lid, wherein the container body has a folded edge formed by folding an upper edge of a peripheral side outward. The upper edge of the middle of the folded edge is lower, the upper edge of the corner is formed higher to provide a clear height difference between the upper edges, and the outer lower edge of the folded edge is substantially all around. The lid is formed at the same height, the lid has the upper edge of the adhered edge to be adhered to the upper edge of the container body substantially corresponding to the upper edge of the container main body, the upper edge of the middle of the side is lower, and the corner is The upper edge is formed high to provide a clear height difference between both upper edges, and the outer lower edge of the adhered edge is substantially the same height all around, and the inner edge of the lower upper edge in the middle of the side A rising side wall portion is formed upward, and the upper end portion of the rising side wall portion is formed as a protruding surface portion, and a high upper edge portion of a corner of the lid and a main upper surface portion of the lid are formed. These are also formed in the same plane with approximately the same height, and near the corners of the lid, uneven ribs of an appropriate length are formed from the top of the lid to the outside of the corners. The upper surface portion has a configuration in which the protruding portion of the rising side wall portion is appropriately protruded upward in the middle of the four sides, and the bottom of the container body is fitted between the protruding portions of the four sides. A food container is formed.

According to the above construction, even when the upper edge of the middle portion is formed lower, the upper edge of the corner is formed to be higher (deeper), so that the lid can be 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. Because the sheet is stretched greatly, the sheet thickness becomes thin, but the middle part of the side is made shallow, so it is possible to prevent excessive elongation, and it can be used even if the lid is formed using a relatively thin sheet Can withstand. In addition, while the middle part of the side of the lid is low, the rising side wall on the inside is formed high, so that the container relatively creates a voluminous appearance and enhances the visual appeal, The display effect of the food container containing the food can be enhanced. Since the corners have a high (deep) configuration, it is possible to prevent the corners of the lid from being drawn into the upper surface of the lid, and to increase the stacking strength as well as the attachment stability of the lid. If a convex surface is formed along the side inside the rising side wall of the lid, when the containers are stacked in multiple stages, the lid is stable and at the same time the bottom of the upper container is the upper surface of the lid in the convex surface Since it is possible to prevent lateral misalignment by fitting into the part, stable stacking is possible. The above function is further improved when the upper surface portion of the lid (the main portion of the upper surface excluding the contact portion with the reinforcing ribs and the container main body portion) is formed as substantially the same plane as a virtual plane connecting the upper edges of the corners of the lid. It will be effective.

Further, according to the above configuration, in a state where the lid is attached to the container main body, a simple attachment form in which the outer lower edge of the lid attachment edge is not unevenly engaged with the outer lower edge of the folded edge of the container body. It can be formed as For example, the height of the lower edge of the lid and the lower edge of the container main body may substantially coincide with each other, or the lower edge of the lid may be stopped at a slightly upper position. In this way, the extension of the plastic sheet at the folded edge of the lid can be suppressed, so that a thinner sheet can be used, the lid can be easily opened, and the lid may be damaged at the time of opening. There is no danger that a part of the food will be spilled by the recoil when the lid is opened. When transporting and storing the molded lid in a cardboard box or the like, a large number of lids can be stored by stacking the entire upper and lower ends, thereby improving the packaging efficiency. However, as in the prior art, the outer lower edge of the lid attachment edge is suspended slightly longer than the outer lower edge of the folded edge of the container body, and an inward protrusion is formed at the tip of the lower edge. The main body may be formed so as to be engaged with the folded lower edge.

[0008] In addition, the high upper edge of the corner and the main upper surface of the lid are both formed in the same plane at the same height, and a suitable length from the upper surface of the lid to the outside of the corner is formed near the corner of the lid. By forming the concave and convex ribs, the corners can be more reliably prevented from being drawn into the upper surface of the lid, and the attachment stability of the lid can be further improved. This can also be achieved by forming a concave surface of an appropriate width, which is slightly recessed below the upper edge of the corner and the upper surface of the lid, along the inside of the upper edge of the corner.

According to the present invention, in addition to the above-described structure, the container main body is provided with a partition wall or an upward projection formed inside the container, and the central portion is formed to be higher than the other portions. And a main upper surface portion at the center of the lid has a configuration formed so as to be in contact with each other in a state where the lid is attached, so that the food container has a transparent lid. This can further increase the strength of the container stacking,
Moreover, even if the lid is formed from a thin plastic sheet, the stability of the lid is further improved.

[0010]

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

The container body 1 is formed by folding the upper edge of the peripheral side surface outward to form a folded edge 2. The outer lower edge, which is the folded end, has substantially the same height over the entire circumference, and the intermediate portion of each side is folded. The upper edge 3 of the edge is formed low, and the corner from the corner to a portion slightly entering the side is curved, and the upper edge 4 is formed high with a clear difference in height, and the middle portion and the corner are formed. An inclined step portion 5 is formed at the folded edge between the upper and lower portions, and a partition wall 6 is formed in the storage space of the container main body. It is formed almost at the same height. The vertical difference between the upper edge 3 of the folded edge at the middle of each side and the lower edge on the outside thereof is preferably 2 mm or more. When the vertical difference is eliminated, the container body is easily bent, and it is difficult to maintain the strength of the container. It is preferable that the height of the upper edge 4 of the folded edge at the corner is higher than the upper edge 3 of the middle part of each side by 3 mm or more. By providing this height difference, the strength of the container body is increased and the lid is increased. Can be stabilized. The sheet thickness of the container body is arbitrary, and may be 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,
Although the figure shows a rectangular container in plan view, other polygons may be used. In the case of a circular container, three or four corners may be formed at equal intervals and corners may be formed between the corners.

The lid 8 is formed by bending the entire lower edge of the lid outwardly and downwardly to form an attachment edge 9, and the outer lower edge is made substantially the same height over the entire circumference, and is attached in the attached state. Upper edge 10 of the middle part of each edge of edge 9
Is low, the upper edge 11 of the corner is high, and an inclined step 12 is formed therebetween, and both are attached in contact with the upper edges 3, 4 and the step 5 of the folded edge of the container body. Thus, the outer lower end of the attachment edge 9 is formed to have the same height as the outer lower edge of the folded edge 2 of the container body, to stop slightly above, or to extend slightly below. In addition, a protruding surface portion 13 which rises slightly higher than the height of the upper edge portion 11 of the corner from the inside of the upper edge portion 10 of each side middle portion, has a rising side wall portion 14, is long along the side, and has an appropriate width. And each projection 13
The upper surface portion 15 of the inner lid is flat except for the reinforcing ribs and the like, and the protruding surface portions 13 formed along each side are stacked in multiple layers on the upper surface portion 15 of the lid surrounded by these. At this time, the bottom surface of the container body 1 is set so as to be fitted almost exactly, so that each protruding surface portion 13 can prevent lateral displacement of the bottom portion of the container stacked on top. The rising side wall 1
4 and the protruding portion 13 may be formed as a flat surface, but the surface shape may be arbitrarily set, such as a continuous uneven surface, and each protruding portion 13 along the side may be formed as a series of protruding surfaces. Alternatively, two or more protruding portions may be formed in a divided or separated state.

Further, the upper edge portion 11 of the corner portion and the upper surface portion 15 near the upper edge going inward from the lid are formed substantially flat, and the upper surface portion 15 has, for example, streaks along the lid contour. May be provided or a slightly concave surface, for example, a concave surface having a diameter or 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
In the flat upper surface, a plurality of uneven ribs 16 of an appropriate length facing the outside of the corner are formed up to the corner end of the upper surface, and the uneven rib 16 is located outward from the upper end, that is, at the corner. It can be extended to any position between the outer edge and the lower edge of the folded edge. The thickness of the plastic sheet for forming the lid 8 can be made smaller than that of the conventional lid. For example, a lid having a small size is thinner, and a large lid is slightly smaller than a small lid. Thick, but the range is 0.1
The thickness is preferably about 2 to 0.25 mm, and the transparent sheet can be formed by compressed air or vacuum. The protruding part 1
3 is preferably formed such 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 that can be in contact with the bottom. If the height is higher, the unevenness of the peripheral portion of the lid becomes too deep, and the sheet thickness must be increased accordingly, which is not preferable. If it is lower, the bottom of the containers to be stacked tends to shift, and it is difficult to maintain the stability of stacking. In addition, the planar contour shape of the lid matches the shape of the container main body, but the rib, the pattern, and other configurations are not limited. Further, as described above, the shape may be any of a square, a polygon, a circle, and the like in plan view.

In the above description, the contact position between a part or protrusion of the partition wall 6 of the container body 1 and the upper surface part 15 of the lid 8 can be set to an appropriate height, for example, the partition wall or protrusion. May be formed to be lower than the folded edge, and the corresponding portion of the lid including the contact portion may be recessed to be lower. When the contact portion of the lid is depressed, the diameter is preferably about 2 cm or less if the top view is circular, and about 2 cm or less per side if it is square.

When the lid 8 having the above structure is attached to the container main body, as shown in FIGS. 2 to 4 and as shown in FIG. 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 12 is fitted to the upper edge 3 of the container 8. In addition, 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 performed reliably. The upper edge 11 of each corner of the lid 8 is attached to the upper edge 4 of each corner of the container body 1 with a sufficient height (depth). Even if the end is not engaged with the outer lower edge of the folded edge 2 of the container main body 1, there is no risk of accidental detachment, and when the containers are stacked in multiple stages, the central part of the lid is the partition wall. 6 is supported by the central portion 7 (in the case of a projection, the projection is used) so that it is not depressed, and since each corner is sufficiently covered as described above, the upper surface 15 of the lid It is possible to prevent the lid surface from being pulled toward the center by a part of the bending (recess),
The lid does not come off. The retraction is more reliably prevented by the ribs 16.

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 adopt a configuration for engaging. In addition, since the protruding portion 13 is formed inside the upper edge portion 10 at the middle of the side via the rising side wall portion 14, the three-dimensional shape of the lid becomes relatively large, the inside of the container becomes easy to see, and the volume feeling of the container is reduced. Since it increases, the display appeal effect as a product can be enhanced. In addition, a step is formed between the upper edge portion and the upper surface portion, and the shape retention of the lid 8 can be further enhanced in combination with the configuration of the corner portion.

FIGS. 6 and 7 show an embodiment different from the above. The upper edge 11 of the corner of the lid 8 is formed to be substantially the same height as the upper surface 15 as in the above embodiment. However, the upper edge 11 and the upper surface 15 are located inside the upper edge 11.
A concave surface 16A which is slightly recessed downward with a step is formed. It is desirable from the viewpoint of the reinforcing effect that the dent is within about 2 mm. Also in this configuration, the step on the outside of the concave surface 16A prevents the upper surface from being bent, and achieves the same stability as the above-described lid attached state.

[Brief description of the drawings]

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

FIG. 2 is a partial front view of the container shown in FIG. 1 with a part thereof omitted;

FIG. 3 is a vertical sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a partial longitudinal sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a partial top view of a corner of the lid of FIG. 1;

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

FIG. 7 is a partial longitudinal sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a vertical sectional view taken along line VIII-VIII of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Folding edge 3 Upper edge of side middle part 4 Upper edge of corner 5 Step part 6 Partition wall 7 Central part 8 Lid 9 Adhering edge 10 Upper edge of side middle part 11 Above corner Edge 12 Step 13 Protrusion 14 Rising sidewall 15 Top 16 Rib 16A Concave

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65D 39/00-55/16

Claims (3)

(57) [Claims] 1. A thermoformed container such as a pressurized vacuum forming method comprising a container main body and a lid, wherein the container main body has a peripheral edge which is folded back outwardly, and which is located on a middle of the folded edge. The edge is low, the upper edge of the corner is formed high, and a clear difference in height is provided between both upper edges, and the outer lower edge of the folded edge is formed with the same height around the entire circumference, The upper edge of the adhered edge to be adhered to the upper edge of the container body substantially corresponds to the upper edge of the container body, and the upper edge of the middle of the side is lowered,
The upper edge of the corner is formed high to provide a distinct height difference between the upper edges, and the outer lower edge of the adhered edge is substantially the same height all around, and the lower upper edge in the middle of the side A rising sidewall portion is formed inward of the upper portion, and an upper end portion of the rising sidewall portion is formed as a protruding surface portion, and both a high upper edge portion of a corner portion of the lid and a main upper surface portion of the lid are substantially formed. It is formed as the same surface at the same height, and an uneven rib strip of an appropriate length from the top surface of the lid to the outside of the corner is formed near the corner of the lid, and further, with respect to the top surface portion of the lid almost at the same height A food container having a transparent lid having a configuration in which a protruding surface portion of a rising side wall portion is appropriately protruded upward in the middle of the four sides so that the bottom of the container body fits between the protruding surfaces of the four sides. 2. The structure according to claim 1, except for the concave and convex ribs extending from the upper surface of the lid to the outside of the corner in the vicinity of the corner of the lid, and the upper edge of the corner is provided along the inside of the upper edge of the corner. A food container having a transparent lid having a configuration in which a concave portion of an appropriate width is formed by slightly recessing the portion and the lid upper surface portion. 3. The container body according to claim 1 or 2, wherein the container body has a partition wall or an upward projection formed inside the container, and a portion near the center portion is formed higher than other portions. A transparent lid food container having a configuration in which a high portion and a main upper surface portion at the center of the lid are formed so as to contact each other when the lid is attached.