JP2019026283A - Lid body for packaging container and method for packaging food product - Google Patents

Abstract

To provide a lid body for a packaging container having openability (easy openness while keeping shape) to rigidity of a seal type three-dimensional molding lid, and to provide a method for packaging a food product using the lid body.SOLUTION: A lid body C that is molded with a thermoplastic resin sheet for press molding having at least a base material layer and a seal layer having a glass transition temperature lower than that of the base material layer specified by JIS K 7121 includes: a cover part 1 covering an opening portion of a container body P when the lid is closed; and a flange part 2 fastened to the flange part P1 of the container body, where the cover part has at least two or more folded parts 11a and 11b that are folded when the lid is opened.SELECTED DRAWING: Figure 1

Description

    The present invention relates to a lid for a packaging container and a food packaging method, for example, for sealing an opening of a container body, and more specifically, a lid for a three-dimensional packaging container having an opening structure and packaging for food. Regarding the method.

  Conventionally, for example, foods sold in supermarkets and convenience stores have been sold in a packaging container made of thermoplastic resin. At this time, the type of packaging container has been selected according to the food and sales form. For example, a packaging container molded from a material having a high hermeticity or gas barrier property has been adopted for foods that can be set for a longer shelf life. Such a packaging container has also been devised for a lid that closes the opening of the container body.

  For example, the top seal type lid body has a higher advantage than other lid bodies in that the opening portion of the container body can be easily sealed by thermocompression bonding, and the range of utilization has expanded. Furthermore, long-term preservation | save of the food was implement | achieved by interrupting | blocking the gas (oxygen in the atmosphere, carbon dioxide, etc.) which causes deterioration of the food permeate | transmitted from a cover body. However, the top seal type lid has a drawback that it is difficult to maintain a desired shape under the influence of heat shrinkage force, gravity, or other external force due to the film shape having low rigidity.

Therefore, in order to top-seal the opening of the container body with a three-dimensional molded lid having a predetermined thickness instead of a film shape, the base material layer contains a polyolefin-based resin that is available at high strength and low cost, An idea of containing a low crystalline polypropylene in the seal layer is disclosed (for example, see Patent Document 1).
Furthermore, the idea of a heat welding type three-dimensional molded lid having a structure that bends when the lid is opened is disclosed. That is, the above idea expects an effect that can be partially opened and closed at any time with a bent portion as a boundary for the purpose of forming a half-open state and ease of resealing (see, for example, Patent Document 2).

International Publication WO2015 / 053380 JP 2003-252355 A

  On the other hand, the sealing type three-dimensional molded lid has a problem that it is difficult to open. This is because the three-dimensional part becomes an obstacle at the time of opening the lid, and not only the force required for peeling is not easily transmitted to the bonded part, but also the force is not easily controlled depending on the peeling strength. That is, if too much force is applied, the bonded portion is peeled off vigorously, and there is a risk that the three-dimensional portions collide with each other to be deformed or damaged, or the contents are scattered. In addition, unlike the sheet-like lid, it is difficult to apply a force uniformly because the lid cannot be pulled substantially parallel to the bonded portion (flange portion). That is, there is a risk that smooth opening is difficult.

  Here, Patent Document 1 discloses easy-openability of the sealed molded lid (whether it can be easily opened), but the above-mentioned openability is related to the sealability (adhesion degree between the molded lid and the container body). In view of this, the openability of the molded lid with respect to the three-dimensional portion is not considered. Furthermore, in Patent Document 2, the shape of the molded lid is in consideration of problems due to elastic deformation peculiar to the flat shape that has been conventionally employed (half-opening and difficulty in resealing). Problems and issues are not considered.

  In response to an unsolved problem in adopting such a top-seal-type molded lid, the inventors arrived at the development of a new molded lid based on a technical idea completely different from the prior art after creative ingenuity. . That is, for the three-dimensional molded lid fixed with the adhesive strength necessary to ensure the sealability of the seal portion, a structure that satisfies both appropriate rigidity and openability is an indispensable element. Etc. have arrived.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lid for a packaging container having an openability (ease of easy opening while maintaining the shape) with respect to the rigidity of a seal type three-dimensional molded lid, and packaging of food using the lid. It is to provide a method.

  That is, the lid of the packaging container according to the present invention is molded from a thermoplastic resin sheet for press molding having at least a base material layer and a seal layer having a glass transition temperature defined in JIS K 7121 lower than that of the base material layer. A cover that covers the opening of the container main body when the lid is closed, and a flange that is fixed to the flange of the container main body, and the cover includes a bent portion that bends when the cover is opened. It may be characterized by having at least two or more.

  The cover part is formed by arranging a plurality of convex parts protruding upward from the flange part, and the bent part is between the flange part and the convex part and / or between each of the convex parts. It is desirable to be provided.

  It is desirable that the cover part further has a position shift prevention part near the boundary with the flange part.

  It is desirable that the flange portion does not have a folded portion that protrudes downward from the outer peripheral edge.

  The food packaging method according to the present invention is characterized in that the container body containing the food is sealed with the lid of the packaging container described above.

  Below, the definition of each requirement which comprises this invention, a meaning, or a specific example is shown.

  “Press molding” may mean molding a thermoplastic resin sheet with a male mold and / or a female mold, and a molding method (for example, vacuum molding, pressure molding, vacuum / pressure molding, double-sided vacuum molding, hot plate) There is no limitation on sheet molding such as molding.

“Thermoplastic resin sheet” may mean a single-layer sheet or a multi-layer laminated sheet made of a predetermined thermoplastic resin, and at least another layer (gas barrier layer) including a base material layer and a sealing layer having different melting points. May be included.) May be laminated.
The thermoplastic resin constituting the “thermoplastic resin sheet” may be, for example, a polyester resin, a polystyrene resin, a polycarbonate resin, or a polyolefin resin, preferably a polyolefin resin, more preferably a polypropylene resin, and polypropylene. A mixture of resin and polyethylene resin may be used, and there is no limitation.

The melting point difference between the base material layer and the sealing layer constituting the “thermoplastic resin sheet” may be 10 ° C. or more, preferably 30 ° C. or more, and more preferably 50 ° C. or more. This is because if the difference in melting point is less than 10 ° C., not only the sealing layer but also the base material layer is melted and the appearance of the sealing part (the surface of the flange part of the lid) may be deteriorated. On the other hand, if the melting point difference is more than 50 ° C., it may stick to the mold during molding and may not peel off.
The haze value (cloudiness) of the “thermoplastic resin sheet” is preferably 10% or less. If it is higher than 10%, the visibility may not be secured.

The “cover portion” may be a portion for covering the opening of the container body when the lid is closed and protecting the contents (for example, food).
The shape of the “cover part” may be rectangular, circular, or elliptical in plan view, and is formed by arranging one or more convex parts protruding upward or downward with respect to the “flange part”. Also good.

Each of the convex portions forming the “cover portion” may have a trapezoidal shape, a rectangular shape, or a circular shape in a plan view and / or an end face view cut vertically.
The height of each of the plurality of convex portions with respect to the “flange portion” may be 5 to 40 mm, preferably 8 to 30 mm, more preferably 10 to 25 mm, and may be the same or different. If the thickness is smaller than 5 mm, a large amount of content does not enter and the superiority of the film-like top seal cannot be obtained. If the thickness is larger than 40 mm, the thickness control becomes difficult, and the sealing performance is deteriorated. The interval between the protrusions may be 0.5 to 2.0 times the height of the protrusions. If it is 0.5 times or less, the projections may interfere with each other at the time of opening, and the opening may be hindered. If it is 2.0 times or more, the distance between the projections may be changed, affecting the bending, and may be prevented from being opened. .
The thickness of the “cover portion” may be 0.2 mm or more. If it is thinner than 0.2 mm, the compressive strength (for example, difficulty in crushing when held in the hand) may be insufficient.

The “flange portion” may be a portion that is in close contact with the flange portion of the container body when the lid is opened to seal the opening portion.
Further, “sealing the opening portion of the container body” may mean closing the opening portion so that the inside of the container body does not come into contact with the outside air. You may employ | adopt the top seal type which adheres the periphery of the opening part of a main body, and the periphery of a "flange part", and the adhesion type which adhere | attaches with a predetermined adhesive agent.

The shape of the “flange” may be the same or different shape as the outer periphery of the “cover” (the outer periphery is rectangular, circular, or elliptical in plan view). Further, it may be a flat shape extending outward from a lower end edge or an upper end edge (based on the protruding direction) corresponding to the outer peripheral end of the “cover portion”.
The thickness of the “flange” may be 0.1 to 0.4 mm. If it is thinner than 0.1 mm, the flange portion may be stretched at the time of opening, and if it is thicker than 0.4 mm, the adhesive strength may be insufficient, or the flange portion may feel hard at the time of opening.

The “folded portion” is a portion for assisting the folding and opening of the lid as the lid is opened, and there may be at least two regularly or irregularly with respect to the “cover portion”.
The form of the “folded portion” is, for example, a slit-like (width 0.5 to 2.5 mm, depth 0.1 to 1.0 mm) or V-shaped or concave groove (width 0.5 to 5 mm, depth). 5 to 40 mm).
The shape of the “folded portion” may be, for example, a straight shape or a shape along the shape of the “cover portion” or the “flange portion” (for example, an L shape or a curved shape).
The directions of the “folded portions” may be parallel or different in angle, and may be orthogonal to the direction of opening (the direction in which the lid is turned up).

  The position and range in which the “folded portion” is provided are, for example, the inner peripheral edge of the other flange portion that faces the central portion of the “cover portion” and / or the portion other than the center from the vicinity of the inner peripheral edge of one flange portion. It may be close to the inside of the other flange part adjacent to the inner peripheral edge of one flange part with respect to a part of the cover part (including the boundary part between the flange part and the boundary part between the convex part and the flat part). It may be up to the vicinity of the periphery. When the “cover portion” is formed by arranging a plurality of convex portions, the “folded portion” may be provided between the “flange portion” and the convex portion and / or between each of the convex portions. .

  The “container body” is a laminate sheet composed of at least a base material layer and a seal layer made of a predetermined thermoplastic resin, has moderate rigidity and heat resistance, and stores contents A shape that can be sealed (eg, a shape that includes at least a bottom portion and a side wall portion standing from the periphery of the bottom portion), and a shape that can be sealed with a lid (eg, the upper edge of the side wall portion is the opening of the container body) Applicable and a shape having a flange portion extending outward from the upper edge.

The “positional displacement prevention unit” may be a part for helping to maintain the lid when the lid is fixed with respect to the container body and / or to maintain the lid closed state.
The form of the “position displacement prevention portion” is, for example, a first position displacement prevention portion projecting upward from a flat portion (a portion other than the convex portion) of the “cover portion” and / or a second portion projecting downward. It may be a misalignment prevention unit.
The shape of the “position shift prevention unit” may be, for example, a linear shape, a curved shape, or an L shape in plan view.

The position of the “position shift prevention part” is, for example, the first position at a position in contact with the inner periphery of the flange part of the container body and / or the vicinity of the knob part inside the “flange part” and picked when the lid is opened. A shift prevention part and / or a second position shift prevention part may be provided, and when the container body is rectangular, it may be provided so as to be close to each of the corners of the four corners.
The state of the “position displacement prevention portion” when the lid is closed may be, for example, the first position displacement prevention portion covering the convex portion of the container body provided at a position close to the knob portion described above, or the flange portion of the container body. The second misalignment prevention unit may come into contact with the inner peripheral edge.

  The “folded portion” may be a portion that is integrally provided so as to protrude downward (substantially hang down) from the outer peripheral edge of the flange portion in order to be externally fitted to the flange portion of the container body.

  The lid of the packaging container according to the present invention has two or more opening portions because the cover portion formed from the thermoplastic resin sheet having the above-described characteristics has at least two bent portions that bend when opened. Since work becomes possible, the difficulty of opening which a sealing type | mold molding lid has can be eliminated. In other words, the bent part does not reach the flange part and the desired sealed state is secured, and the bent part is bent stepwise (in order) with the opening operation, so the cover part is forcibly bent and broken. The effect that the lid can be opened smoothly partially or entirely without using it is expected.

  Further, the cover portion is formed by arranging a plurality of convex portions protruding above the flange portion, and the bent portion is provided between the flange portion and the convex portion and / or between each of the convex portions. Thus, since the convex portions do not interfere with each other when the lid is opened, smooth opening is realized. That is, for example, since the first bent portion is between the flange portion and the convex portion, the force immediately after opening as the first step is transmitted to the bent portion and bent, so that the convex portion While maintaining an adhesion state, breakage can be avoided. Further, since the second bent portion is between each of the convex portions, the force applied as the second step is transmitted to the bent portion and bends. Therefore, the convex portion on the back side from the bent portion is bent. While maintaining the adhesion state, it is possible to avoid damage to the convex portion on the near side.

  In addition, since the cover portion further includes a position shift prevention portion in the vicinity of the boundary with the flange portion, not only is it easy to seal in a fixed position, but also an inadvertent opening of the lid is prevented. That is, when the flange portion is sealed to the flange portion of the container body when the lid is closed, for example, the above-described first misalignment prevention portion is put on the convex portion of the container body, and the second misalignment prevention portion is placed on the container body. By contacting the inner peripheral edge of the flange part, not only can the fixed position of the lid be easily determined, but if the convex part of the container body is in the vicinity of the knob of the lid, the initial opening force Therefore, it is possible to avoid the possibility of opening due to impact during transportation or dropping.

  Further, since the flange portion does not have the folded portion that protrudes downward from the outer peripheral edge, since there is no portion that interferes with the operation of the flange portion at the time of opening the lid, the unsealing property is improved. That is, the sealing lid has a different closing means from the outer fitting lid that fits and closes the flange portion of the container body from the outside. In addition, since the operation of the flange portion accompanying the opening of the lid is different, the opening without the folded portion can be smoothly performed. Further, by not having the folded portion, it is possible to prevent the occurrence of injury such as cutting a finger at the tip.

  In addition, the food packaging method according to the present invention only realizes long-term storage of food compared to a fitting lid by sealing the container body containing the food with the lid of the packaging container described above. In addition, when the cover portion is formed by arranging a plurality of convex portions projecting upward from the flange portion, in addition to accommodating the volume of the convex portion in comparison with the sheet-like seal lid, two more If the above-described two-stage opening by the bent portion is realized, it is possible to eliminate the risk of damaging or popping out food as compared with the conventional opening means. Furthermore, by sealing the container body with a molded lid, the appearance can be improved, and the reliability of the product held by the consumer can be improved. In addition, the folded portion can be concealed by wrapping the packaging container containing the food with a band shrink film or the like on which product information is printed and printed so as to cover the lid, which is the same as in the past. Good looking products can also be provided. In other words, from the conventional simple impression, it is possible to expect the effect of improving the consumer's willingness to purchase by providing a packaging method that gives a sense of cheapness in addition to a sense of luxury and solidness.

It is a perspective view of the state where the lid in one embodiment of the present invention was equipped with the container main part. It is a top view of the said cover body. It is a front view of the said cover body. It is a top view of the said container main body. It is a front view of the said container main body.

With reference to FIGS. 1 to 5, the lid of the packaging container according to the present embodiment (hereinafter also referred to as “the main lid”), the container main body (hereinafter referred to as the “main container main body”), and the main lid and the container A method for packaging food by the main body will be described.
In these drawings, a plurality of identical parts may be numbered only in one part. For parts that cannot be confirmed on the drawing and cannot be seen, some of the parts and lead lines are indicated by broken lines. In the drawings, there are some parts that are depicted in phantom, in which the parts and lead lines are indicated by two-dot chain lines. In the drawings, when the rear view is a front view and / or the left side view is the same as or symmetrical to the right side view, the rear view and / or the left side view may be omitted.
The direction of the lid of the packaging container may be based on the normal direction in which the consumer faces the packaging container, and this normal direction may be the front of the lid of the packaging container. The nearer to the consumer located in the front may be represented as the near side, the farther away as the far side, the left hand direction as the left side, the right hand direction as the right side, the upward direction as the upper side, and the downward direction as the lower side.

  First, an outline of the lid and a food packaging method using the lid will be described with reference to FIG.

  As shown in FIG. 1, this lid body was molded with a thermoplastic resin sheet for press molding having at least a base material layer and a seal layer having a glass transition temperature defined in JIS K 7121 lower than the base material layer. The cover C includes at least a cover portion 1 that covers the opening of the container body P when the lid is closed, and a lid flange portion 2 that is fixed to the body flange portion P1 of the container body. You may have at least 2 bending part 11 (11a, 11b) bent at the time of lid opening.

  Further, the cover portion 1 is formed by arranging a plurality of convex portions 12 (12a, 12b) projecting upward from the flange portion 2, and the bent portions 11 (11a, 11b) are formed between the flange portion and the convex portion. And between each of the convex portions.

  Further, the cover portion 1 may further include a misalignment prevention portion 13 (13a, 13b) in the vicinity of the boundary with the flange portion 2.

  Moreover, the flange part 2 does not need to have the folding | returning part which protrudes below from an outer periphery.

  Moreover, the food packaging method using the present lid may seal the container body P in which the food is accommodated by the lid C.

Next, details of the lid body and the container body will be described with reference to FIGS.
First, the structure of the present lid body (particularly the cover portion 1) will be described with reference to FIGS.

2 and 3 includes a cover portion 1 projecting upward from a flat portion serving as a foundation, a flange portion 2 extending outward from the lower end edge of the cover portion, and the flange portion You may be comprised with the knob | pick part 3 applicable to the substantially right-angled square part shape | molded integrally. The shape of the lid 1 may be a substantially rectangular shape in plan view.
The cover portion 11 may have a shape protruding toward the container body side (downward). The shape of the lid 1 may be circular or elliptical in plan view.

The cover portion 1 includes a first bent portion 11a and a second bent portion 11b that are bent in order in accordance with the operation of opening the lid, and a first convex portion 12a that is arranged to bisect the longitudinal direction. In addition, a second misalignment prevention portion 13b and a second misalignment prevention portion 13b may be provided near the boundary with the flange portion 2 and at the four corners. The shape of the cover part 1 may be a substantially rectangular shape in plan view.
In addition, the cover part may be circular or elliptical in plan view, and the arrangement of each part in that case may be the same or different.

The 1st convex part 12a and the 2nd convex part 12b may protrude upwards from the inner periphery of the flange part 2 at predetermined intervals. The boundary between the first convex portion 12a and the second convex portion 12b may be a width of 1 to 3 mm and a direction orthogonal to the longitudinal direction of the cover portion 1. The shape of the first convex portion 12a in plan view may be a substantially trapezoidal shape having a cutout portion 12ay in which one corner of a substantially rectangular shape is cut out. The planar shape of the second convex portion 12b may be a substantially rectangular shape. The planar shape of the first convex portion 12a and the second convex portion 12b may be the same shape and the same size except for the presence or absence of the notch portion 12ay. The shape of the first convex portion 12a and the second convex portion 12b as viewed from the end surface cut at substantially the center in the longitudinal direction is substantially trapezoidal and may have the same shape and the same size. The inclination angle of the first convex side wall part 12ax and the second convex side wall part 12bx in which the first convex part 12a and the second convex part 12b are adjacently opposed to each other is opposite to these. The slope may be steeper than the inclination angle of the side wall (hereinafter also referred to as “outside side wall”).
The notch 12ay is provided on the knob 3 side, and is notched in a direction perpendicular to a bisector that bisects the knob, and is a flat wall surface having a predetermined inclination angle. Also good.

  In addition to the first convex portion 12a and the second convex portion 12b, one or a plurality of other convex portions may be adjacent to each other, and the planar view shape combining them may be a rectangular shape or a circular shape as a whole. However, it may be oval. The interval between the first convex portion 12a and the second convex portion 12b may be more than 3 mm, and there is no limitation as long as it is not necessary to provide another convex portion to ensure rigidity. The notch 12ay may be provided at the other corner of the first convex portion 12a and at one and / or both corners of the second convex portion 12b.

The first bent portion 11a is parallel to the lower end edge within a range close to the lower end edge of the notch portion 12ay (or the boundary between the notch portion and the flat portion of the cover portion 1) and not reaching the flange portion 2. May be provided. The shape of the first bent portion 11 a may be a concave shape that is recessed downward from the flat portion of the cover portion 1.
The 2nd bending part 12a may be provided in the range which does not reach the flange part 2 and the straight part between the 1st convex part 12a and the 2nd convex part 12b. In other words, the 2nd bending part 12a may correspond to the flat part (width 1-3mm) of the cover part 1, and even if it is not the concave shape dented below like the 1st bending part 11a. Good.
The directions of the first bent part 11a and the second bent part 12a may be orthogonal to the opening direction.

  Note that not only the first bent portion 11a and the second bent portion 11b but also other bent portions are flat portions of the cover portion 1, gaps between other convex portions, or notches in other convex portions. You may be provided in the position close | similar to the lower end part of a part.

The 1st position shift prevention part 13a may protrude L-shaped and upward along the corner | angular part in which the knob | pick part 3 is distribute | arranged. In other words, the 1st position shift prevention part 13a may be distribute | arranged between the knob | pick part 3 and the 1st bending part 11a.
The second misalignment prevention unit 13b may be L-shaped and protrude downward along three corners other than the corner where the knob 3 is disposed.
The width of the first misregistration prevention unit 13a may be wider than the width of the second misregistration prevention unit 13b.

  The first misregistration prevention unit 13a may be linear, rectangular, circular, or the like, and both end portions may be inclined surfaces. There is no limitation on the width of the first misalignment prevention unit 13a and the second misregistration prevention unit 13b.

  Next, the structure of this container main body is demonstrated using FIG.4 and FIG.5.

The container main body P shown in FIGS. 4 and 5 has a substantially flat bottom portion (not numbered), a main body side wall portion (not numbered) erected from the periphery of the bottom portion, and an upper end edge of the main body side wall portion. A main body flange portion P1 extending outward from the main body, a main body knob portion (not numbered) formed integrally with the four corner portions of the main body flange portion, and a portion projecting inward from the main body side wall portion It may be composed of a protrusion P2 protruding from the upper end of the.
As long as the flange portion 2 of the lid C can be fixed to the main body flange portion P1, the shape of the container main body P in plan view is not limited. Ribs may be provided from the bottom to the side wall.

The protruding portion P2 may be L-shaped and protrude upward along a corner portion where the main body knob portion is disposed. The shape of the projecting portion P2 is not limited as long as the first misalignment preventing portion 13a of the lid C is covered with no excess gap (or is appropriately fitted).
In addition, the protrusion part P2 may be provided in another corner | angular part and other parts, as long as it does not interfere with the 2nd position shift prevention part 13b.

  Next, the sheet structure that constitutes the main lid and the main container body will be described.

The lid C is composed of a laminated sheet in which a base material layer located on the outermost layer on the opposite side to the container body P side and a seal layer located on the innermost layer on the container body side are laminated. Also good.
The thickness of the laminated sheet before molding may be 0.2 to 0.4 mm, preferably 0.25 to 0.35 mm, and more preferably 0.27 to 0.33 mm.
Note that the laminated sheet constituting the lid 1 may be laminated with other layers such as a printing layer, a gas barrier layer, and a dry lamination adhesive layer.

The base material layer may be a portion that contacts the thermocompression bonding device when sealing the opening of the container body. The thermoplastic resin constituting the base material layer may be, for example, a polyolefin resin, preferably a polypropylene resin, and may contain an inorganic filler.
The thickness of the base material layer may be 150 μm to 350 μm. The melting point of the base material layer may be 160 ° C. or higher.

The seal layer may be a portion that contacts the flange portion of the container body when the opening portion of the container body P is sealed. The thermoplastic resin constituting the sealing layer may be, for example, a polyolefin resin, and an easy peel property in which a plurality of resins (for example, a polypropylene resin and a polyethylene resin) are mixed within a range where the mixing ratio of the polyolefin resin is 50% or more. A resin may be used, and a polystyrene resin and various additives may be mixed as appropriate.
The thickness of the sealing layer may be 10 μm to 100 μm. The melting point of the sealing layer may be 110 ° C to 150 ° C.
The sealing layer may be laminated not only on the entire base material layer but also on the portion corresponding to the flange portion of the container body in the base material layer by so-called part coating.

  Considering thermocompression bonding such as a top seal type, the melting point difference between the base material layer and the seal layer may be 10 ° C. or more, preferably 30 ° C. or more, and more preferably 50 ° C. or more. If the difference in melting point is not higher than 10 ° C., not only the seal layer but also the base material layer is melted, and the appearance of the seal portion (the surface of the lid flange portion, etc.) may be deteriorated. On the other hand, if the melting point difference is more than 50 ° C., it may stick to the mold during molding and may not peel off.

The container body P is a laminate in which at least a base material layer made of a predetermined thermoplastic resin and another layer including a seal layer (for example, a gas barrier layer disposed between the base material layer and the seal layer) are laminated. The sheet may be molded, have a suitable rigidity and heat resistance, a shape that can store the contents, and a shape that can be sealed with the lid C.
The base material layer and the seal layer of the container body P may be entirely or partially equivalent to the contents described in the base material layer and the seal layer of the lid C.

  When sealing the opening part of the container main body P with the lid C, a thermocompression bonding apparatus having a predetermined temperature (for example, 170 ° C. to 230 ° C.) from above the lid with respect to the main body flange portion P1 of the container main body. May be pressed. At this time, the lid layer C is melted as it is and both the sealing layers are melted by the difference between the melting point of the base material layer of the lid C, the melting point of the sealing layer, and the melting point of the sealing layer of the container body P. The body may be thermocompression bonded to the flange portion of the container body.

  Here, the opening strength of the lid and the container body will be described.

The opening strength of the portion where the main body flange portion P1 of the container main body P and the flange portion 2 of the lid C are fixed may satisfy the following conditions.
Condition 1) 1st opening strength is 20N or less Condition 2) 1st opening strength ≦ 2nd opening strength

“1st opening strength” means the opening strength of the first portion to be opened (for example, the opening strength from the unopened state to the first bent portion 11a), and “2nd opening strength” means the 1st opening strength or later The opening strength (for example, the opening strength from the first bent portion 11a to the second bent portion 11b) may be meant.
When “1st opening strength” is larger than 20N under condition 1, a strong force is required for opening, and there is a possibility that a child or an elderly person cannot easily open. The difference between “1st opening strength” and “2nd opening strength” may be 15N. The reason for the condition 2 may be due to the arrangement (ease of applying force) or the area (the width of the part to be peeled) of the fixing part.

  Next, with reference to FIG. 1, FIG. 3, and FIG. 5, the operation and situation when the lid is opened from the container body will be described.

  First, when the knob part 3 of the lid C is picked and turned up, it reaches the outer edge of the first misalignment prevention part 13a. At this time, since the first misalignment prevention portion 13a covers the projection P2 of the container main body P and the projection is arranged in the operation direction of the opening lid, Since it is difficult to peel off, a force greater than the initial opening force is required.

  If the lid is continuously opened after removing the first misalignment prevention portion 13a from the projection P2, the first bent portion 11a is bent. That is, the opening operation of the first stage is finished when the first bent portion 11a is bent, and the initial opening force is adjusted (or the force at the time of passage of the protrusion P2 is generally “1st opening force”). Since it is difficult to peel off as it is, a further force (hereinafter also referred to as “2nd opening force”) is required.

  If the lid is opened as it is after the first bent portion 11a is bent, the flange portion 2 surrounding the outer edge of the first convex portion 12a starts to peel off from the main body flange portion P1. The reason why the 2nd opening force at this time is larger than the 1st opening force is that the interval and area of the fixing portion between the flange portion 2 and the main body flange portion P1 are wider than the corner portion to the first bent portion 11a. It is done. If the lid is further opened, the opening direction becomes the direction perpendicular to the second bent portion 11b, the second bent portion starts to bend and the first convex portion 12a is inclined upward, and the fixing portion is moved. When peeling is completed, the first convex side wall portion 12ax and the second convex side wall portion 12bx face each other.

  If the lid is opened as it is after the second bent portion 11b is bent, the flange portion 2 surrounding the outer edge of the second convex portion 12b starts to peel off from the main body flange portion P1. The opening force at this time may be equivalent to the 2nd opening force described above. When the lid is further opened, the second convex portion 12b is inclined upward, and the fixing portion is completely peeled off to complete the lid opening.

  Therefore, the following effects can be expected from the embodiment of the present lid.

  The cover body has a first bent portion 11a and a second bent portion 11b that are bent when the cover portion 1 molded from the thermoplastic resin sheet having the above-described characteristics is opened. Since work becomes possible, the difficulty of opening which a sealing type | mold molding lid has can be eliminated. That is, the first bent portion 11a and the second bent portion 11b do not reach the flange portion 2 and ensure a desired sealing state, and the first and second bent portions are accompanied with the opening operation. Since the bent portions are bent stepwise (in order), it is possible to expect an effect that the cover portion 1 can be smoothly opened partially or entirely without forcibly bending and breaking the cover portion 1.

  Further, the cover part 1 is formed by arranging a first convex part 12a and a second convex part 12b that protrude upward from the flange part 2, and the first bent part 11a and the second bent part 11b are formed. Is provided between the flange portion 2 and the first convex portion 12a and / or between the first convex portion and the second convex portion, the first convex portion and the first convex portion when the lid is opened. Since the second convex portion does not interfere, smooth opening is realized. That is, for example, since the first bent portion 11a is between the flange portion 2 and the first convex portion 12a, the force immediately after opening as the first step is transmitted to the first bent portion. Since it bends, it can maintain the adhesion state of this 1st convex part, and can avoid damage. Further, since the second bent portion 11b is between the first convex portion 12a and the second convex portion 12b, the force applied as the second step is transmitted to the second bent portion and bent. Therefore, while maintaining the adhesion state of the second convex portion on the back side from the second bent portion, it is possible to avoid the breakage of the first convex portion on the near side.

  Further, since the cover portion 1 further includes the first misalignment prevention portion 13a and the second misalignment prevention portion 13b in the vicinity of the boundary with the flange portion 2, it is not only easy to seal in place but also inadvertently. It leads to prevention of opening. That is, when the flange portion 2 is sealed to the main body flange portion P1 of the container main body P when the lid is closed, for example, the above-described first misalignment prevention portion 13a is put on the protruding portion P2 of the container main body, and the second position. If the slip prevention portion 13b is brought into contact with the inner peripheral edge of the flange portion of the container main body, the fixed position of the lid C can be easily determined, and the protruding portion of the container main body can be picked by the lid. If it is in the vicinity of the portion 3, it becomes a barrier against the transmission of the initial opening force, so that it is possible to avoid the possibility of opening due to impact during transportation or dropping.

  Further, since the flange portion 2 does not have a folded portion that protrudes downward from the outer peripheral edge, there is no portion that interferes with the operation of the flange portion at the time of opening the lid, so that the unsealing property is improved. That is, the sealing lid body is different from the outer fitting lid body in which the main body flange portion P1 of the container body P is fitted from the outside to close the lid, so that the above outer fitting lid body is used. In addition, since the folded portion included in is not required and the operation of the flange portion 2 associated with the opening is different, the unfolded portion can be opened more smoothly. Further, by not having the folded portion, it is possible to prevent the occurrence of injury such as cutting a finger with a sharp tip.

  Moreover, the packaging method of the foodstuff using this lid body and this container main body seals the container main body P in which the food was accommodated by the lid body C, so that food can be stored for a long period of time compared to the fitting lid body. Not only to realize, but when the cover portion 1 is formed by arranging the first convex portion 12a and the second convex portion 12b projecting upward from the flange portion 2, compared with the sheet-like seal lid In addition to being able to accommodate a large amount of food for the volume of these convex portions, if the two-stage opening by the first bent portion 11a and the second bent portion 11b is realized, the food is damaged compared with the conventional opening means. The fear of jumping out or jumping out can be eliminated. Furthermore, by sealing the container main body P with the molded lid C, the appearance can be improved and the reliability of the product held by the consumer can be increased. In addition, by wrapping the packaging container containing the food with a band shrink film or the like on which product information is printed and printed so as to cover the lid C, the first bent portion 11a and / or the second The bent portion 11b can be hidden, and a product that looks the same as before can also be provided. In other words, from the conventional simple impression, it is possible to expect the effect of improving the consumer's willingness to purchase by providing a packaging method that gives a sense of cheapness in addition to a sense of luxury and solidness.

C cover 1 cover portion 11a first bent portion 11b second bent portion 12a first convex portion 12b second convex portion 13a first misalignment preventing portion 13b second misalignment preventing portion 2 flange Part 3 Cover picking part P Container body P1 Body flange part P2 Protrusion part

Claims (5)

A lid molded from a thermoplastic resin sheet for press molding having at least a base material layer and a seal layer having a glass transition temperature defined in JIS K 7121 lower than the base material layer,
A cover portion that covers the opening portion of the container body when the lid is closed, and a flange portion that is fixed to the flange portion of the container body,
The cover part has at least two or more bent parts that bend when the cover is opened. The cover part is formed by arranging a plurality of convex parts protruding upward from the flange part,
The lid of the packaging container according to claim 1, wherein the bent portion is provided between the flange portion and the convex portion and / or between each of the convex portions. The lid of the packaging container according to claim 1 or 2, wherein the cover part further includes a position shift prevention part near a boundary with the flange part. The said flange part does not have a folding | returning part which protrudes below from an outer periphery. The cover body of the packaging container as described in any one of the Claims 1 thru | or 3 characterized by the above-mentioned. A method of packaging food, comprising: sealing the container body containing the food with the lid of the packaging container according to any one of claims 1 to 4.

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