Packaging containers and methods for using packaging containers

Abstract

To provide a packaging container that easily adopts to the volume of content that is hard to regulate, easily addresses re-packaging of content that is hard to predict, and easily protects content that is easy to be damaged, making it easy to improve the production efficiency, and to provide a method of using the packaging container.SOLUTION: The container includes: a container body 1 with a storage part 1a that stores the content; a lid body 2 with a screen-like cover 2a that covers at least the storage part 1a; and a hinge 3 formed between the container body 1 and the lid body 2. The container body 1 includes a body engaging part 14 formed at the position facing the hinge 3, and the lid body 2 includes a lid body engaging part 21 formed at the position facing the hinge 3 so as to be engaged with the body engaging part 14.SELECTED DRAWING: Figure 1

Description

Technical Field

[0005]

[0001] The present invention relates to a packaging container including a container body for containing food and a lid for protecting the food, and a method of using the packaging container.

Background Art

[0002] Conventionally, fruits such as strawberries and grapes sold in supermarkets and convenience stores, for example, have been stored in a molded container body and covered with a thin film from above, and displayed on a product shelf. Since foods such as fruits have different individual sizes even if they are of the same type and are likely to have different amounts protruding from the container body, it is difficult to define the volume to be stored, and it is difficult to package them with a molded lid.

[0003] For example, Patent Document 1 discloses a technique in which an adhesive is applied except for both end edges of the film and end portions in the longitudinal direction of both end edges, and the film is attached to both side walls of a rectangular container through the adhesive, so that the film can be attached with a tension suitable for the volume of the contents, and even if the end portions in the longitudinal direction protrude outside the side walls of the rectangular container, troubles such as the adhesive sticking to other adjacent containers can be avoided.

Prior Art Documents

Patent Documents

[0004] [[ID=​​​​​​​​​​​​However, in Patent Document 1, because the adhesive adheres to the rectangular container, if the film is peeled off and reattached to repackage the contents, the adhesive strength may be weaker than before peeling, causing the film to peel off, or adhesive residue may be left on the side walls of the rectangular container, making it look unsightly. On the other hand, if a film with strong adhesive strength is used to prevent the film from peeling off easily, there is a concern that the process of repacking (reopening) for inspection or replacement of contents will involve the effort of peeling off the film and the effort of reattaching the film while being careful of the adhesive on the peeled film, resulting in persistent difficulties in the work. Furthermore, if the film is not properly adhered and the adhesive portion is peeling outwards, the film may stick to other products in the shopping bag of the consumer who purchased the product, causing the product to tip over when removed, potentially significantly reducing its value. In addition, the film is too thin to protect the contents from certain external forces, which can easily lead to a decrease in product value. Furthermore, the film must be produced separately from the container body, and because it is too thin, it is difficult to cut and apply adhesive to, which may result in poor production efficiency and higher manufacturing costs.

[0006] Food products containing fresh produce, which are prone to deformation, discoloration, and deterioration due to external environmental factors, tend to be replaced frequently. Therefore, the inventors, through ingenuity and resourcefulness, arrived at the conclusion that a cover structure that can be easily covered over a container without using adhesive, is harder than film, prevents a decrease in product value against a given external force, and allows for improved production efficiency with minimal processing steps, would solve the problems described in Patent Document 1 and realize a cover structure that can be easily covered over a container.

[0007] Therefore, the object of the present invention is to provide a packaging container and a method of using the packaging container that can be easily adapted to the volume of contents that is difficult to define, can easily handle the repackaging of contents that are difficult to predict, can easily protect fragile contents from external forces, and can easily improve production efficiency. [Means for solving the problem]

[0008] In other words, the packaging container in the present invention comprises a container body having a storage portion for containing contents, a lid having a curtain-like cover portion that covers at least the storage portion, and a hinge formed between the container body and the lid, wherein the container body has a body engagement portion formed at a position opposite to the hinge, and the lid has a lid engagement portion formed at a position opposite to the hinge so as to engage with the body engagement portion.

[0009] The container body preferably has a main flange portion that extends outward from the housing portion, and the main engagement portion is preferably formed on the housing portion side from the outer edge of the main flange portion.

[0010] Furthermore, another packaging container in the present invention comprises a container body having a storage section for containing contents, a double-hinged lid having a curtain-like cover section that covers at least the storage section, and a hinge formed between the container body and the lid, wherein the lid has a lid engagement section formed at a position opposite the hinge so as to engage with each other.

[0011] The lid preferably has an expandable section formed parallel to the hinge.

[0012] The thickness of the lid cover should preferably be greater than the thickness of the bottom surface of the container body.

[0013] The method of using the packaging container according to the present invention is characterized by including the steps of: disengaging the lid engagement portion; rotating the lid on the hinge axis to open the storage portion; replacing the contents of the storage portion; rotating the lid on the hinge axis to cover the storage portion; and engaging the lid engagement portion.

[0014] In this invention, "formation" means the state of having a predetermined shape. "Molding" means simply shaping or being shaped without limiting the manufacturing method, and "formation" means shaping or being shaped by fitting into a predetermined mold. In other words, "formation" and "molding" are almost synonymous, and "molding" is an expression that includes "formation." [Effects of the Invention]

[0015] According to the present invention, it is possible to expect an effect that it is easy to adapt to the volume of the content that is difficult to define, it is easy to cope with the repackaging of the content that is difficult to predict, it is easy to protect the easily damaged content from external forces, and it is easy to improve the production efficiency.

Brief Description of the Drawings

[0016] [Figure 1] It is a plan perspective view of the packaging container in one embodiment of the present invention. [Figure 2] It is a (a) plan view and (b) cross-sectional view of the X-X portion of the above packaging container. [Figure 3] It is a plan perspective view of another packaging container in one embodiment of the present invention. [Figure 4] It is a plan perspective view of another packaging container in one embodiment of the present invention. [Figure 5] It is a plan view of the above packaging container. [Figure 6] It is an enlarged end face view of the Y1-Y1 portion of FIG. 5. [Figure 7] It is an enlarged view of the Y2-Y2 portion from the direction of arrow R in FIG.

Mode for Carrying Out the Invention

[0017] Hereinafter, referring to FIGS. 1 and 2, the structure of a packaging container (hereinafter also referred to as "this packaging container") in one embodiment of the present invention will be described. In these figures, for the same parts that exist in plural, there are also parts marked with reference numerals for only one part. For the sake of convenience of explanation, a predetermined part and this lead line are shown by a hidden line (broken line) or an imaginary line (two-dot chain line), and there is also a part where the cross-sectional part is shown by hatching. In the description, terms indicating directions such as upward, downward, sideward, outward, inward, vertical direction, horizontal direction, etc. are basically based on the state in which the packaging container is installed in the normal use direction, for example, FIG. 2(a). When other references are used, it will be explained as appropriate.

[0018] <Overview of this packaging container> This packaging container is for packaging fresh foods such as fruits and vegetables including domestic and foreign grapes such as Shine Muscat, peaches, pears, apples, Shine Muscat, citrus fruits such as yuzu, persimmons, and Dekopon, as well as mushrooms, salads, and boxed lunches. It preferably includes a container body 1 for containing the contents, a lid 2 for covering the container body 1, and a hinge 3 formed between the container body 1 and the lid 2, all integrally molded. However, they may also be connected after being molded separately. This packaging container is sized to be placed on the display shelves in retail stores, but it is not limited to this size.

[0019] <Overview of the container body 1> The container body 1 has a storage portion 1a for containing the contents. Specifically, the container body 1 includes a bottom surface portion 11 for placing the contents, a storage portion 1a formed by a main body side wall portion 12 that continuously rises upward from the peripheral edge of the bottom surface portion 11, a main body flange portion 13 that extends continuously outward from the upper end edge of the main body side wall portion 12 toward the outside of the storage portion 1a, and a main body engaging portion 14 formed at a position facing the hinge 3. The planar shape of the container body 1 is a shape in which one of the longitudinal directions of a substantially rectangular shape having a longitudinal direction and a short transverse direction is curved, but it may also be a non-curved substantially rectangular shape, a substantially square shape, a pentagonal or higher shape, a circular shape, or a shape obtained by modifying a part of these shapes.

[0020] <Overview of the lid 2> The lid 2 has a curtain-like cover portion 2a that covers at least the storage portion 1a of the container body 1. Specifically, the lid 2 includes a cover portion 2a that is thin and flat like a curtain and does not engage with the storage portion 1a, and a lid engaging portion 21 formed at a position facing the hinge 3 so as to engage with the main body engaging portion 14. The lid 2 has a higher elastic modulus, strength, and rigidity than conventional films and is rotatable about the hinge 3 with respect to the container body 1 and is bendable in the same direction as the rotation direction.

[0021] <Overview of the hinge 3> The hinge 3 is the connecting part between the container body 1 and the lid 2, and is located in the part sandwiched between the integrally molded container body 1 and lid 2. The hinge 13 is a part processed after the molding of the container body 1 and lid 2, and may be a perforation with alternating non-cut and cut sections, a part thinner than the thickness of the container body 1 and lid 2 and easily bendable, a member that connects the separately molded lid 2 to the container body 1, or simply a part that is bent in the part sandwiched between the integrally molded container body 1 and lid 2.

[0022] With this configuration, the lid 2 is rotated on the hinge 3 relative to the container body 1, and the lid engagement part 21 is engaged with the body engagement part 14. This allows the contents stored in the storage section 1a to be covered by the cover part 2a. Furthermore, even if the amount of contents overflowing from the storage section 1a differs for each product, the lid 2 flexibly bends and deforms to follow the amount of overflow. This not only provides just enough pressure to prevent the contents from being overcompressed or displaced by the packaging with the cover part 2a, but also, due to the specifications of the thickness, strength, and rigidity of the cover part 2a, the contents are less likely to be damaged even if a predetermined external force is applied through the cover part 2a. As a result, it is expected that this will make it easier to adapt to the volume of contents which is difficult to define, easier to handle the repackaging of contents which is difficult to predict, easier to protect fragile contents from external forces, and easier to improve production efficiency.

[0023] <Specifications regarding the formation method, material, dimensions, etc. of the container body 1, lid 2, and hinge 3> The container body 1, lid 2, and hinge 3 are preferably integrally formed by thermoforming a synthetic resin sheet using sheet molding methods such as vacuum forming, hot plate pressure forming, vacuum pressure forming, or double-sided vacuum forming. The synthetic resin sheet may be made of polyester resin such as polyethylene terephthalate, olefin resin such as polyethylene or polypropylene, or polystyrene resin, and may be formed as a single-layer or multi-layer sheet. It may be colored or opaque, but is preferably colorless and transparent. The surface and / or back surface of the synthetic resin sheet may be covered with a synthetic resin film, and if the surface is covered, printing may be applied. There are no particular restrictions on the thickness of the synthetic resin sheet, but it should be 0.18 to 1 mm, preferably 0.2 to 0.8 mm, and more preferably 0.25 to 0.6 mm. There are no particular restrictions on the size of the container body, but for example, it may be 50 to 350 mm in width and 50 to 350 mm in depth.

[0024] Because the container body 1 has a storage section 1a, it is molded more three-dimensionally than the lid 2. Therefore, it is stretched more than the lid 2 during thermoforming. As a result, the thickness of the cover portion 2a of the lid 2 may be thicker than the thickness of the bottom portion 11 of the container body 1. This not only gives the cover portion 2a sufficient strength and rigidity to protect the contents, but also ensures that the lid 2 is neither too thick nor too thin, resulting in less wrinkling and a smoother appearance compared to conventional films. This can be expected to improve the appearance, such as making the contents appear fresher and creating a sense of luxury. Furthermore, because a moderate tension is maintained, it is expected that the cover portion will form a nice dome shape when it covers the storage section.

[0025] The detailed structure of container body 1 is described below.

[0026] <Storage section 1a> The storage section 1a does not limit the area of ​​the bottom surface 11 or the height of the main body side wall 12, and the capacity of the storage section 1a determined by these can be any, for example, 100 to 1800 cc or 200 to 1000 cc. The bottom surface 11 and the main body side wall 12 may have one or more predetermined steps or inwardly recessed reinforcing ribs (not shown) in the vertical or horizontal direction, or they may be flush without them. The opening of the storage section 1a, which corresponds to the opening of the container body 1, is formed at the upper edge of the main body side wall 12.

[0027] <Bottom part 11> The bottom portion 11 may have a base (not shown) for holding and maintaining a firm contents, such as persimmons, in a predetermined state. The base only needs to be raised toward the inside of the container body 1, and may be one or more in number, and may be positioned approximately in the center or elsewhere of the bottom portion 11, and may be rectangular, circular or elliptical in plan view, and rectangular, semicircular or elliptical in vertical cross-sectional view, and may be of any size as long as it does not hinder the aesthetics of the packaging container or normal use.

[0028] <Main body side wall portion 12> The main body side wall portion 12 is formed according to the position of the hinge 3 and the shape, position, and size of the main body engagement portion 14. Specifically, the main body side wall portion 12 is formed by recessing a portion of the longitudinal side facing the hinge 3 inward so that the inner edge of the main body engagement portion 14 protrudes into the inside of the housing portion 1a, and by lowering a portion of the longitudinal side facing the hinge 3 so that the height of the main body engagement portion 14 is relatively low, but the shape is not limited to this.

[0029] <Main body flange portion 13> The main flange portion 13 is formed according to the shape, position, and size of the main engagement portion 14. Specifically, the main flange portion 13 is formed by recessing a portion of the longitudinal side facing the hinge 3 downwards so that the height of the main engagement portion 14 is relatively lower, and is formed so that a gap corresponding to the length of the main engagement portion 14 is created. In other words, it is not formed in the part where the main engagement portion 14 is formed, but is formed continuously in the circumferential direction except for the above-mentioned portion, but is not limited to this shape. The main flange portion 13 has unnumbered main flange recesses formed with a predetermined width and depth on the longitudinal and transverse sides adjacent to the hinge 3, which is expected to reinforce the strength of the container body 1 and make it easier to remove and see the contents.

[0030] <Main body engagement part 14> The main body engagement portion 14 is formed on the housing portion 1a side from the outer edge of the main body flange portion 13. In other words, at least the outer edge of the main body engagement portion 14 does not protrude outward from the outer edge of the main body flange portion 13, and the outer edge of the main body engagement portion 14 is located on the same straight line formed by the outer edge of the main body flange portion 13, and the outer edge of the main body engagement portion 14 and the outer edge of the main body flange portion 13 do not form a predetermined unevenness in the circumferential direction.

[0031] With this configuration, the engagement portion with the lid engagement portion 21 is closer to the housing portion 1a, which increases the curvature of the lid 2 and makes it easier to create a beautiful dome shape. Furthermore, it makes it easier to insert the lid engagement portion 21 vertically, and after insertion, the lid engagement portion 21 fits easily within the projected area of ​​the container body 1. This makes it easier to arrange multiple units on display shelves, prevents damage to other products in shopping baskets during purchase, and gives consumers an overall impression of compactness. In addition, because there are no bumps or protrusions, the number of units formed from each sheet during production increases, which is expected to improve productivity.

[0032] The main body engagement portion 14 has a slit-shaped main body engagement through hole 14a into which the lid engagement portion 21 is inserted and hooked. However, it can be in any form as long as it can engage with the lid engagement portion 21, and it may also be in a form that fits with the lid engagement portion 21. The main body engagement through hole 14a may be circular or rectangular, and it may be a form into which the lid engagement portion 21 is not inserted but simply hooked. The main body engagement through hole 14a is located on the housing portion 1a side from the outer edge of the main body engagement portion 14, and more specifically, it is 3 to 20 mm away from the outer edge of the main body engagement portion 14, preferably 5 to 15 mm away, and more preferably 7 to 13 mm away. The main body engagement through hole 14a is parallel to the outer edge of the main body engagement portion 14, but may be formed perpendicular or obliquely. Also, the main body engagement through hole 14a may be curved or bent so as to be convex toward the outer edge. This configuration allows for maintaining the strength of the blade during production, improving productivity, and is expected to facilitate engagement (catching) with the lid engagement portion. Furthermore, there are no particular restrictions on the width of the main body engagement through hole 14a, but it is acceptable if it is between 15 and 30 mm, or between 18 and 28 mm.

[0033] The main body engagement portion 14 is positioned lower than the upper end surface of the main body flange portion 13, taking into consideration the length of the lid engagement portion 21, so as to make it easier to cover the housing portion 1a with the cover portion 2a, but it may also be positioned at the same height. The ratio of the height H1a of the main body engagement portion 14 to the height H1b of the upper end surface of the main body flange portion 13 (H1a:H1b) may be 1:1 to 1:5, preferably 3:4 to 1:4, more preferably 2:3 to 1:3, and may be determined according to the length of the lid engagement portion 21.

[0034] The main body engagement portion 14 has wavy main body engagement grooves 14b along its outer and inner edges to prevent cracking and whitening during cutting, but any form is acceptable as long as an equivalent effect can be achieved, for example, a dot-shaped embossing or through holes. The main body engagement portion 14 is roughly rectangular in plan view, but it may be square, polygonal, or circular including semicircles or ellipses.

[0035] The detailed structure of lid 2 is described below.

[0036] <Cover part 2a> The cover portion 2a has an expandable portion 22 formed parallel to the hinge 3, which allows the cover portion 2a to expand and contract in the shorter direction, making it easier to conform to the volume of contents which differs for each product, and is expected to have the effect of holding the contents in place with pressure appropriate to the volume, thus preventing displacement.

[0037] The plan view shape of the cover portion 2a is a roughly rectangular shape with a longitudinal direction and a transverse direction, but it may be a square, a pentagon or more, or a circle, or a shape that is a deformed part of these. The transverse length D2 of the cover portion 2a is longer than the transverse length D1 of the container body 2, so that the cover portion 2a can be expected to have the effect of easily covering contents that protrude upward from the storage portion 1a. The length of D2, or the portion of D2 excluding the expandable portion 22, may be designed to be longer depending on the contents. For example, in the case of contents that tend to protrude from the container body 1 and are easily damaged by external forces, such as Shine Muscat grapes, the length may be 1.5 to 2 times that of D1. The length W2 of the cover portion 2a in the longitudinal direction is shorter than the length W1 of the container body 2. This prevents the shorter side of the cover portion 2a from protruding beyond the container body 1, making it easier to arrange multiple units on display shelves and preventing damage to other products in the shopping basket during purchase. It is preferable if the length is approximately the same as the length of the storage portion 1a in the longitudinal direction, as this would cover almost all of the contents.

[0038] <Extendable part 22> The expandable portion 22 has an expandable first portion 22a formed on the hinge 3 side and an expandable second portion 22b formed on the lid engagement portion 21 side, but it may be located near the center of the cover portion 2a, and may be a set of protrusions or two or more sets of protrusions on both the front and back surfaces of the cover portion 2a, or a row of protrusions or two or more rows of protrusions on one of the front or back surfaces, or a slit structure in which one or more slits cut to a predetermined length are arranged. The protrusion structure in the expandable portion 22 may have an end face shape that is arc-shaped, jagged, or a combination of arc-shaped and jagged, as shown in Figure 2(b).

[0039] Here, the width of the expandable portion 22 (length in the direction of expansion and contraction) is not particularly limited, but is for example 10 to 50 mm, preferably 20 to 40 mm, and more preferably 25 to 35 mm. When the expandable portion 22 has a convex structure, the width of each convex expands or contracts to obtain expandability. The width of each convex in the direction of expansion and contraction (length between adjacent valleys of the convex portion) is not particularly limited, but is for example 5 to 15 mm, preferably 8 to 12 mm, and more preferably 7 to 11 mm. The height and depth in the vertical direction are not particularly limited, but are for example 1 to 15 mm, preferably 2 to 10 mm, and more preferably 3 to 5 mm.

[0040] When the expandable portion 22 has a slit structure, the slit expands and contracts to provide expandability. The width of a single slit in the expansion direction (distance between adjacent slits) is not particularly limited but is 1 to 15 mm, more preferably 3 to 12 mm, and more preferably 5 to 9 mm. The length of the slit (cut portion) is not particularly limited but is 5 to 60 mm, more preferably 10 to 40 mm, and more preferably 15 to 30 mm. The distance between slits (length of the uncut portion) is not particularly limited but is 1 to 10 mm, more preferably 1.5 to 7.5 mm, and more preferably 2 to 5 mm.

[0041] <Lid engagement portion 21> The lid engagement portion 21 is a two-stage tongue protruding from the edge of the cover portion 2a in the opposite direction to the hinge 3, and has lid engagement projections 21a and 21b protruding from each surface of the tongue. However, it can be in any form as long as it can engage with the main body engagement portion 14, and may be a single-stage or three-stage or more tongue, and may be in a form that can fit into the main body engagement portion 14, or may be in a form that can be inserted into or removed from the main body engagement through hole 14a or hooked onto it. The length of the lid engagement portion 21 should be such that it does not come into contact with the mounting surface of the packaging container when engaged with the main body engagement portion 14, and preferably it should be a length that fits within the projected area of ​​the container body 1. More specifically, the length of the lid engagement portion 21 should be shorter than the height H1a of the main body engagement portion 14, for example, it should be 60 mm or less, 55 mm or less, or 50 mm or less.

[0042] The lid engagement projections 21a and 21b protrude in the direction shown in Figure 2(b) (inward when the cover portion 2a is closed). However, if they protruded in the opposite direction (outward when the cover portion 2a is closed), even if the lid engagement projection 21 was bent from between the lid engagement projections 21a and 21b to prevent it from coming loose, the lid engagement projection 21a corresponding to the bent portion would face inward, thus making it less noticeable. If there were perforations between the lid engagement projections 21a and 21b, it would be easier to bend them.

[0043] Next, we will explain how to use this packaging container.

[0044] Firstly, the method of packaging contents using this packaging container includes the steps of: placing the contents into the storage section 1a of the container body 1; rotating the lid 2 on the hinge 3 to cover the contents from above with the cover section 2a; and inserting the lid engaging section 21 into the main body engaging through-hole 14a from the surface side of the main body engaging section 14, and hooking the lid engaging projection 21a or 21b onto the back side of the main body engaging section 14. This method is expected to allow for easy and rapid packaging of contents without the need to prepare a separate film or adhere a film to the container body, as is done in the past.

[0045] Next, the method for repackaging (repacking) the contents of this packaging container by replacing the contents includes the steps of: removing the lid engaging portion 14 which is engaged with the main body engaging portion 14 of the container body 1, which has a storage portion 1a covered by a cover portion 2a; more specifically, pulling out the lid engaging portion 14 from the main body engaging through hole 14a so as to release the catch of the lid engaging projection 21a or 21b on the back side of the main body engaging portion 14; rotating the lid 2 on the hinge 3 to open the storage portion 1a; taking out the contents in the storage portion 1a and re-storing other contents (a step of replacing the contents of the storage portion); rotating the lid 2 on the hinge 3 to cover the storage portion 1a again; and engaging the main body engaging portion and the lid engaging portion. This method is expected to have the effect of allowing the contents to be repackaged easily and quickly any number of times without having to remove or re-adhere the film from the container body as in the conventional method.

[0046] It should be noted that the packaging container shown in this embodiment is not limited to the above-described content, and includes the position, shape, dimensions, and relationships between any part, as long as equivalent effects can be obtained.

[0047] Next, referring to Figures 3 to 7, we will explain the differences between another packaging container in one embodiment of the present invention and the packaging container described above, while omitting the explanation of equivalent parts. To facilitate reference, parts or components equivalent to those shown in Figures 1 and 2 are uniformly numbered 100 and 200 in Figures 3 to 6.

[0048] As shown in Figure 3, the lid 102 is of the double-door type and has lids 102a and 102b. Of the hinges 103, hinge 103a is formed between the container body 101 and lid 102a, and hinge 103b is formed between the container body 101 and lid 102b. The lid 102 has lid engagement portions 121 at positions opposite to the hinges, and specifically, lids 102a and 102b have lid engagement portions 121a and 121b at positions opposite to hinges 103a and 103b so as to engage with each other. With this configuration, the container body 101 does not need to be formed into a body engagement portion, and the lids 102a and 102b can be rotated around the hinges 103a and 103b respectively to cover the unnumbered storage portion of the container body 101. Therefore, it is expected that packaging, loading and unloading, and repackaging of the contents will all be made easy.

[0049] There may be multiple lid engagement portions 121b parallel to the hinge 103b, which makes it easier to adjust the size of the dome formed by the lid 102, even if the lid engagement portion 121a is a single-stage type. By inserting the lid engagement portion 121a onto the lid engagement portion 121b from above, the lid 121a does not protrude outward, making it easier to form a neat dome. The shapes and lengths of the lids 102a and 102b in the short-side direction may be the same or different.

[0050] As shown in Figures 4 and 5, the body engagement through-hole 214a included in the body engagement portion 214 of the container body 201 is curved and protrudes outward from the container body 201, and is formed by a curved blade. This improves the durability of the blade shape because the curved blade is relatively less prone to warping compared to a straight blade, and it is also expected to have the effect of making it easier for the lid engagement projections 221a and 221b of the lid engagement portion 221 to catch and difficult to pull out.

[0051] As shown in Figures 4 and 5, the cover portion 202a of the lid 202 is composed only of a single expandable portion 222s having a thin and low projection at its longitudinal end parallel to the hinge 203, or two or more of these are arranged in a continuous, uneven manner, and has projections 223, 223 to prevent stacked packaging containers from sticking together during transport, etc., and markings 224, 224 to indicate that the hinge 203 is an opening that can be torn off by perforations or the like.

[0052] <Extendable single unit 222s> As shown in Figure 6, the expandable unit 222s is composed of expandable unit ends 222se, 222se corresponding to the longitudinal ends, and an expandable unit longitudinal section 222sf that is continuous with the expandable unit ends 222se. As shown in Figure 5, the width in the short direction of the expandable unit ends 222se, 222se is narrower than the width in the short direction of the expandable unit longitudinal section 222sf, and as shown in Figure 7, the height of the expandable unit ends 222se, 222se is relatively lower than the height of the expandable unit longitudinal section 222sf. With this configuration, if the expandable unit ends 222se, 222se, which are the parts that are cut by the cutting machine when forming the packaging container, are thin and low, the difference in shape from the flat plate-shaped part that is easiest to cut is reduced, which can be expected to prevent burrs from forming or crushing due to incomplete cutting.

[0053] <Protrusion 223> As shown in Figures 4 and 5, the projection 223 protrudes from the flat portion of the cover portion 202a and protrudes outward and / or inward from the cover portion 202a when the lid 202 is attached to the container body 201, preferably protruding only outward so as not to damage the contents. With this configuration, the projection 223 contacts a predetermined part of the stacked packaging containers, creating a gap, which is expected to make them easier to remove. The projection 223 may be located on the lid engagement portion 221 side or on the hinge portion 203 side, preferably located around the corner portion of the cover portion 202a, and may be rectangular, circular, or elliptical in plan view, and rectangular, semicircular, or elliptical in vertical cross-sectional view, and any size is acceptable as long as it does not interfere with the aesthetics of the packaging container or normal use. The lid engagement projections 221a and 221b of the lid engagement portion 221 may also function as the projection 223.

[0054] <Marker section 224> As shown in Figures 4 and 5, the marker portion 224 may be a portion that protrudes from the flat portion of the cover portion 202a in the shape of an arrow and / or letters, or a portion that is printed on the flat portion, and may be granular or linear. If the marker portion 224 is the protruding portion, it may or may not be formed by a known embossing process, and when the lid 202 is attached to the container body 201, it protrudes outward and / or inward from the cover portion 202a, preferably protruding only outward so as not to damage the contents. [Explanation of symbols]

[0055] 1,101,201 Container body, 1a Storage section 11 Bottom part 12 Main body side wall 13 Main body flange section 14,214 Body engagement part, 14a, 214a Body engagement through hole, 14b Body engagement uneven part 2,102(102a,102b),202 Lid, 2a,202a Cover 21,121,221 Lid engagement part, 21a, 21b, 121a, 121b, 221a, 221b Lid engagement protrusion 22,222 Telescopic part, 22a Telescopic part 1, 22b Telescopic part 2 222s: Telescopic single unit, 222se: Telescopic single unit end, 222sf: Telescopic single unit longitudinal section 223 Protrusion 224 Marker section 3,103(103a,103b),203 hinge

Claims

1. A container body having a compartment for containing contents, A lid having at least a cover portion that covers the housing portion, It comprises a hinge formed between the container body and the lid, The container body has a body engagement portion formed at a position opposite the hinge, The lid has a lid engagement portion formed at a position opposite the hinge so as to engage with the main body engagement portion. The cover portion has an expandable section formed parallel to the hinge. A packaging container characterized by the following features.

2. The container body has a main flange portion that faces outward from the storage area. The main body engagement portion is formed on the housing side from the outer edge of the main body flange portion. The packaging container according to feature 1.

3. A container body having a compartment for containing contents, A double-door type lid having at least a cover portion that covers the storage area, It comprises a hinge formed between the container body and the lid, The lid has a lid engagement portion formed in a position opposite the hinge so as to engage with each other. The cover portion has an expandable section formed parallel to the hinge. A packaging container characterized by the following features.

4. The thickness of the lid cover is greater than the thickness of the bottom of the container body. A packaging container according to any one of features 1 to 3.

5. A method of using a packaging container according to any one of claims 1 to 4, The process of removing the lid engagement part, The process involves rotating the lid on the hinge to open the storage compartment, The process of replacing the contents of the storage compartment, The process involves rotating the lid around the hinge to cover the storage area, The step includes engaging the lid engagement portion. A method for using a packaging container characterized by the following features.

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