JP2022071135A - Container with lid, container lid, and attachment and detachment method of container lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container with lid in which a container lid seals an opening container body even before or after thermal shrinkage of the opening container body.

SOLUTION: A container with lid includes an opening container body and a container lid that detachably fits an opening side of the opening container body. The opening container body is thermally formed from a synthetic resin sheet and has a thermal shrinkage property by heating. The opening container body and the container lid protrude toward an opening of the opening container body on each of circumferences and include a body flange portion and a lid flange portion which are flange portions provided in an annular shape. The container lid fits the opening container body by the lid flange portion internally fitting to the body flange portion after thermal shrinkage by heating of the opening container body.

SELECTED DRAWING: Figure 8

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a container with a lid, a container lid, and a method for attaching and detaching the container lid. The present invention relates to a method for attaching and detaching a container lid for attaching and detaching a container lid that can be fitted to a lid and an opening container body that shrinks heat by heating.

Conventionally, there is a container with a lid provided with an opening container body that opens upward in the vertical direction and a container lid that is detachably fitted to the opening side of the opening container body. In the open state, contents such as liquid, semi-solid, and solid are filled into the opening container body from the opening, and storage, cooking, transportation, and the like are performed while maintaining the vertical orientation.

In the conventional container with a lid, the lid-side fitting portion provided on the container lid is fitted from the outside in the horizontal direction to the main body-side fitting portion provided on the opening container body around the horizontal direction. By mating, the open container body and the container lid are fitted (Patent Document 1). In this way, the fitting method in which the container lid fits from the outside of the open container body is called outer fitting, while the fitting method in which the container lid fits inside the opening container body is called outer fitting. It is known to be called internal fitting.

Since the conventional container with a lid is thermally molded from a synthetic resin sheet, the fitting portion on the main body side and the fitting portion on the lid side are easily elastically deformed, and when the container lid is fitted to the opening container main body, the container is easily deformed. Further, when the container lid is removed from the opening container main body, the main body side fitting portion is appropriately deformed inward in the horizontal direction, and the lid side fitting portion is appropriately deformed outward in the horizontal direction. Transforms into.

As a result, in the conventional container with a lid, the main body side fitting portion and the lid side fitting portion are in close contact with each other in the fitting state, the container lid seals the open container main body, and the finger is used. The container lid can be freely attached to and detached from the opening container body by fitting the container lid or removing the container lid with a finger.

Japanese Unexamined Patent Publication No. 2018-11502

By the way, containers with lids that users such as consumers and businesses purchase and carry in from convenience stores, supermarkets, suppliers, factories, etc. are pre-filled with foods such as prepared foods, noodles, and confectionery. Some open containers are heated by a heating device such as a microwave oven, an oven, or a baking line while the main body of the open container is filled with these foods. In some cases, the container lid is removed from the container with a lid to be purchased or carried in in an empty state, the open container body is filled with food in a high temperature state, and then the container lid is used to cover the container again.

Further, it may be exposed to heated steam or the like to sterilize the main body of the open container by heat.

In the conventional container with a lid, the opening container body thermoformed from the synthetic resin sheet has a property of heat shrinkage due to such heating. Such thermal shrinkage due to reheating after thermoforming is also referred to as secondary shrinkage. Therefore, while the container lid is externally fitted to the open container body, if the open container body is thermally shrunk, a gap is created between the main body side fitting portion and the lid side fitting portion. There will be a situation where these do not come into close contact with each other.

Further, if this gap is large, a situation may occur in which the container lid is pulled out from the opening container body.

As a result, it is difficult for the container lid to seal the open container body after the heat shrinkage of the open container body.

In view of such a problem, the present invention relates to a container with a lid, a container lid, and a container lid in which the container lid can seal the open container body before and after the heat shrinkage of the open container body. The purpose is to provide a desorption method.

(1) The present invention is a container with a lid provided with an open container body and a container lid that is detachably fitted to the opening side of the open container body, and the open container body is heat-molded from a synthetic resin sheet. The main body of the open container and the container lid are flange portions that protrude toward the opening of the open container main body at their respective peripheral edges and are provided in an annular shape. The container lid has a flange portion and a lid flange portion, and after the heat shrinkage of the opening container body due to the heating, the lid flange portion is internally fitted to the main body flange portion and fitted to the opening container main body. It is intended to provide a container with a lid, which is characterized in that.

That is, since the lid flange portion is internally fitted to the main body flange portion, the annular lid flange portion is fitted to the inside of the main body flange portion located in a direction away from the center thereof. At this time, since the opening container main body is thermally shrunk and the annular main body flange portion is shrunk toward the center thereof, the shrunk main body flange portion and the lid flange portion are in close contact with each other.

Thereby, in the container with a lid of the present invention, the container lid enables the opening container body to be sealed.

(2) The present invention is a container with a lid provided with an open container body that opens upward in the vertical direction and a container lid that is detachably fitted to the opening side of the open container body, and the open container body. Is thermally molded from a synthetic resin sheet and has a property of heat shrinking by heating, and the opening container body and the container lid are flange portions that protrude upward at their respective peripheral edges and are provided in an annular shape. It has a main body flange portion and a lid flange portion, and the lid flange portion is externally fitted to the main body flange portion in the fitted state, and is a peripheral wall that the main body flange portion has inside in the horizontal direction. It has a lid inner peripheral wall which is a peripheral wall disposed inwardly from a certain main body inner peripheral wall, and the lid inner peripheral wall has a heat shrinkage allowance in the horizontal direction of the main body inner peripheral wall with respect to the main body inner peripheral wall. Provided is a container with a lid, which is characterized by being separated by a distance equivalent to that of the above.

That is, in the container with a lid of the present invention, the lid flange portion is externally fitted to the main body flange portion, so that the container lid can seal the open container main body.

Further, after the heat shrinkage of the opening container main body, the position of the inner peripheral wall of the main body is displaced inward in the horizontal direction by the heat shrinkage allowance as the flange portion of the main body shrinks. Since the inner peripheral wall of the lid is arranged in advance at a distance equivalent to the heat shrinkage allowance before shrinkage, the inner peripheral wall of the main body and the inner peripheral wall of the lid are in close contact with each other after the shrinkage, and the container lid is in close contact with the inner peripheral wall of the lid. Seals the opening container body.

As described above, the container with a lid of the present invention enables the container lid to seal the open container body before and after the heat shrinkage of the open container body.

In this sealed state, the inwardly facing portion such as the inner peripheral wall of the lid is in close contact with the opening container body side, and the opening container body and the container lid are fitted to each other. Applicable to the case.

(3) Further, the inner peripheral wall of the main body and the inner peripheral wall of the lid may be inclined so as to be located inward toward the upper side in the vertical direction.

That is, in the inner fitting state after the heat shrinkage of the opening container body, the inner peripheral wall and the inner peripheral wall of the lid, which are in close contact with each other, engage with each other by inclining so as to be located inward toward the upper side. In order for the container lid to be removed from the opening container body, this engaged state must be released. As a result, in the container with a lid of the present invention, the container lid is difficult to be removed from the opening container body, and the sealed state can be easily maintained.

(4) Further, the main body flange portion has a flange-shaped locking flange portion that protrudes outward in the horizontal direction, and the lid flange portion is a peripheral wall that is provided on the outer side in the horizontal direction. It has a convex locked convex portion that protrudes inward in the horizontal direction, and the locked convex portion locks the locked flange portion downward in the vertical direction in the fitted state. May be good.

That is, since the fitting portion on the opening container body side for outer fitting is compactly configured by the locked flange portion, the container lid is used for filling, cleaning, etc. of the contents. When removed from the container, the inward elastic deformation on the opening container body side and the outward elastic deformation on the container lid side can be made smaller. As a result, in the container with a lid of the present invention, the container lid has a structure that seals the opening container body, but the container lid can be easily attached and detached.

(5) The present invention is a container lid that covers an open container body to form a container with a lid, and has a lid flange portion that protrudes toward the opening of the open container body at the peripheral edge and is provided in an annular shape. The present invention provides a container lid characterized in that, after the heat shrinkage of the opening container body due to heating, the lid flange portion is internally fitted into the opening container body to cover the opening container body.

That is, since the lid flange portion is internally fitted to the opening container body, the annular lid flange portion is fitted to the inside of the opening container body located in a direction away from the center thereof. At this time, since the opening container main body is thermally contracted and contracted toward the center thereof, the opened container main body and the lid flange portion after shrinking are in close contact with each other.

As a result, the container lid of the present invention seals the opening container body.

(6) The present invention is a method for attaching and detaching a container lid for attaching and detaching a container lid to be fitted to the opening container main body to an open container main body which is thermally molded from a synthetic resin sheet and has a property of heat shrinking by heating. After the container lid removal step of removing the container lid externally fitted to the open container body from the open container body, the container lid removal step, the heating step of heating the open container body, and the heating step. The present invention provides a method for attaching and detaching a container lid, which comprises a refitting step of internally fitting the container lid removed in the container lid removing step into the heat-shrinked open container body in the heating step. Is.

That is, in the method of attaching and detaching the container lid of the present invention, in the container lid removing step without preparing another container lid that matches the dimensions of the opening container body after heat shrinkage for the purpose of the heating step. The removed container lid can be used to cover the opening container body again. Therefore, one container lid can seal the open container body before and after the heat shrinkage of the open container body.

(7) Further, the opening container main body and the container lid have a main body flange portion and a lid flange portion which are flange portions provided in an annular shape and project upward in the vertical direction at their respective peripheral edges, and the container. In the outer fitting state before the lid removal step, the lid inner peripheral wall, which is a peripheral wall arranged apart from the inner peripheral wall of the main body, which is the peripheral wall of the main body flange portion on the inner side in the horizontal direction, is the lid flange. The inner peripheral wall of the lid is separated from the inner peripheral wall of the main body by a distance equivalent to the heat shrinkage allowance in the horizontal direction of the inner peripheral wall of the main body. The relationship between the flange-shaped locking flange portion that protrudes outward in the horizontal direction and the convex locked convex portion that protrudes inward from the outer peripheral wall of the lid, which is the peripheral wall of the lid flange portion on the outside. The refitting step includes a step of releasing the stopped state, the opening container main body is covered with the container lid, and the lid flange portion is covered so that the inner peripheral wall of the main body and the inner peripheral wall of the lid come into contact with each other. It may include a step of internally fitting to the main body flange portion.

That is, in the heating step, the position of the inner peripheral wall of the main body is displaced inward in the horizontal direction by the heat shrinkage allowance as the flange portion of the main body shrinks. Since the inner peripheral wall of the lid is arranged in advance at a distance equivalent to the heat shrinkage allowance before shrinkage, the inner peripheral wall of the main body and the inner peripheral wall of the lid are in close contact with each other after the shrinkage, and the container lid is in close contact with the inner peripheral wall of the lid. Can seal the opening container body.

In this way, in the refitting step, the inner peripheral wall of the main body and the inner peripheral wall of the lid are in close contact with each other, so that even when a content that easily leaks from a gap such as a liquid or a semi-solid is filled. In the method of attaching / detaching to / from the container lid of the present invention, the container lid can firmly seal the opening container body.

(8) The present invention is a method for attaching and detaching a container lid for attaching and detaching a container lid to be fitted to the opening container main body to an open container main body which is thermally molded from a synthetic resin sheet and has a property of heat shrinking by heating. A container lid removing step of removing the container lid externally fitted to the opening container body from the opening container body, and a filling step of filling the opening container body with food in a high temperature state after the container lid removing step. After the filling step, the container lid is attached and detached, which includes a refitting step of internally fitting the container lid removed in the container lid removing step into the heat-shrinked open container body in the filling step. It provides a method.

That is, in the method of attaching and detaching the container lid of the present invention, in the container lid removing step without preparing another container lid that matches the dimensions of the opening container body after heat shrinkage for the purpose of the filling step. The removed container lid can be used to cover the opening container body again. Therefore, one container lid can seal the open container body before and after the heat shrinkage of the open container body.

(9) Further, the open container main body and the container lid have a main body flange portion and a lid flange portion, which are flange portions provided in an annular shape and project upward in the vertical direction at their respective peripheral edges, and the container. In the outer fitting state before the lid removal step, the lid inner peripheral wall, which is a peripheral wall arranged apart from the inner peripheral wall of the main body, which is the peripheral wall of the main body flange portion on the inner side in the horizontal direction, is the lid flange. The inner peripheral wall of the lid is separated from the inner peripheral wall of the main body by a distance equivalent to the heat shrinkage allowance in the horizontal direction of the inner peripheral wall of the main body. The relationship between the flange-shaped locking flange portion that protrudes outward in the horizontal direction and the convex locked convex portion that protrudes inward from the outer peripheral wall of the lid, which is the peripheral wall of the lid flange portion on the outside. The refitting step includes a step of releasing the stopped state, the opening container main body is covered with the container lid, and the lid flange portion is covered so that the inner peripheral wall of the main body and the inner peripheral wall of the lid come into contact with each other. It may include a step of internally fitting to the main body flange portion.

That is, in the heating step, the position of the inner peripheral wall of the main body is displaced inward in the horizontal direction by the heat shrinkage allowance as the flange portion of the main body shrinks. Since the inner peripheral wall of the lid is arranged in advance at a distance equivalent to the heat shrinkage allowance before shrinkage, the inner peripheral wall of the main body and the inner peripheral wall of the lid are in close contact with each other after the shrinkage, and the container lid is in close contact with the inner peripheral wall of the lid. Can seal the opening container body.

In this way, in the refitting step, the inner peripheral wall of the main body and the inner peripheral wall of the lid are in close contact with each other, so that even when a content that easily leaks from a gap such as a liquid or a semi-solid is filled. In the method of attaching / detaching to / from the container lid of the present invention, the container lid can firmly seal the opening container body.

The present invention provides a container with a lid, a container lid, and a method for attaching / detaching the container lid so that the container lid can seal the open container body before and after the heat shrinkage of the open container body. Can be done.

The front view of the container 1 with a lid which concerns on embodiment of this invention is shown. The front sectional view of the opening container main body 2 which concerns on embodiment of this invention is shown. The plan view of the opening container main body 2 which concerns on embodiment of this invention is shown. The front sectional view of the container lid 3 which concerns on embodiment of this invention is shown. The plan view of the container lid 3 which concerns on embodiment of this invention is shown. The enlarged view of the S part of the container lid 3 plane which concerns on embodiment of this invention is shown. The front sectional view of the container 1 with a lid which concerns on embodiment of this invention is shown. The partial end view of the fitting state Bs before the secondary shrinkage in the EE cross section of the container 1 with a lid which concerns on embodiment of this invention is shown. The partial end view of the fitting state As after the secondary shrinkage in the EE cross section of the container 1 with a lid which concerns on embodiment of this invention is shown. The flow diagram which shows the 1st container lid attachment / detachment method CS1 which concerns on embodiment of this invention is shown. The flow chart which shows the 2nd container lid attachment / detachment method CS11 which concerns on embodiment of this invention is shown. The plan view of the container lid which concerns on the modification of embodiment of this invention is shown.

Hereinafter, embodiments of the present invention will be illustrated with reference to the drawings. In the front view of FIG. 1, reference numeral 1 is a container with a lid. The container with a lid 1 includes an open container main body 2 and a container lid 3 that is detachably fitted to the open side of the open container main body 2. As shown in the plan view of the opening container body 2 and the plan view of the container lid 3 described later, the container 1 with a lid is formed in a substantially oval shape that is long to the left and right in a plan view.

Regarding the orientation of the container with a lid 1 shown in the figure and the opening container main body 2 and the container lid 3 constituting the container, the vertical direction in the front view is referred to as a vertical direction V, and the direction in which the opening container main body 2 opens is referred to as an upward U. The opposite direction is called downward D. Further, the horizontal direction including the left-right and front-back directions of the front view is simply called the horizontal direction H, the left-right direction of the front view is called the width direction W, and the left-facing direction of the front view is simply called the left-facing L. The reverse direction is called rightward R. Further, the direction toward the center of the horizontal direction H of the opening container body 2 or the container lid 3 is referred to as inward I, and the direction away from the center is referred to as outward O. Then, in the horizontal direction H, the side of the inward I is called the inside, and the side of the outward O is also called the outside.

The opening container body 2 is a molded product in the shape of an open bottom container obtained by thermoforming a synthetic resin sheet, and is open upward in U and constant in the vertical direction V so that the food F can be held inside. Has a depth of. The synthetic resin sheet formed on the opening container body 2 contains a material made of a crystalline polymer, and contains, for example, polypropylene (PP), a PET-based resin such as crystalline polyethylene terephthalate (C-PET), and polylactic acid. Including those used as raw materials. FIG. 1 shows a state in which the opening container main body 2 is colored white.

It is known that synthetic resin sheets made from these crystalline polymers as raw materials shrink by heating after molding. For example, in the case of PET-based resin, it is known that when heated to 110 ° C. or higher, heat shrinks at any ratio of 2/1000 to 18/1000 depending on the type of resin. Such thermal shrinkage due to reheating after thermoforming is also referred to as secondary shrinkage.

As shown in the front view of FIG. 1 and the front sectional view of FIG. 2, the opening container main body 2 has a main body flange portion 4 which is a flange portion which protrudes upward at the peripheral edge and is provided in an annular shape. As shown in FIG. 2, the opening container main body 2 opens upward from the container portion 2a for holding the food F through the step portion 2b. Then, a main body flange portion 4 is provided at the peripheral edge of the main body opening 2c so as to surround the main body opening 2c in an annular shape. The front cross section of FIG. 2 is the EE cross section shown in the plan view of the opening container body of FIG.

As shown in the front view of FIG. 1 and the front sectional view of FIG. 4, the container lid 3 has a lid flange portion 5 which is a flange portion which protrudes upward at the peripheral edge and is provided in an annular shape. The container lid 3 hangs downward from the end of the canopy portion 3a, which is the ceiling portion, and the lowermost part of the hanging portion constitutes the lid opening 3b. Then, a recess 3c extending outward O is provided on the outside of the lid opening 3b. Then, an annular lid flange portion 5 surrounding the recess 3c is provided on the outer peripheral edge of the recess 3c so as to rise from the recess 3c.

The container lid 3 is a molded product obtained by thermoforming a synthetic resin sheet in the same manner as the opening container body 2, but a raw material that does not cause secondary shrinkage such as the opening container body 2 is used, or the container lid 3 is used. A raw material whose shrinkage rate is smaller than the shrinkage rate at the time of the secondary shrinkage of the opening container body 2 is used even when the secondary shrinkage occurs. FIG. 1 shows a state in which the container lid 3 is transparent.

As shown in FIG. 3, the main body flange portion 4 extends outwardly from the main body opening 2c.

The main body flange portion 4 has a main body flange contact surface 4a which is a flat surface of upward U as shown in FIGS. 2 and 3. Further, the main body flange portion 4 has a locking flange portion 6 that hangs downward from the outer end of the main body flange contact surface 4a and protrudes outward O from the lower end thereof. Further, the main body flange portion 4 is an inner peripheral wall, and has a main body inner peripheral wall 7 that is inclined so as to be located inward toward the upper side in the vertical direction V.

As shown in the plan view of the lid of FIG. 5, the lid flange portion 5 extends outward from the recessed portion 3c on the outside of the lid opening 3b so as to extend outward.

The lid flange portion 5 has a lid flange contact surface 5a which is a flat surface of downward D as shown in FIGS. 4 and 5. Further, the lid flange portion 5 is an outer peripheral wall, and has a lid outer peripheral wall 8 that hangs downward from the outer end of the lid flange contact surface 5a. Further, the lid flange portion 5 is an inner peripheral wall, and has a lid inner peripheral wall 9 that is inclined so as to be located inward toward the upper side in the vertical direction V. It should be noted that FIGS. 4 and 5 are provided with arrows for indicating the EE cross section and the FF cross section of the container 1 with a lid, which will be described in detail later.

The locking flange portion 6 is provided so as to project in the left half of FIG. 2 in the left direction L in the width direction W and in the right half in the right direction R in the width direction W. Further, the locking flange portion 6 surrounds the entire circumference of the main body flange contact surface 4a as shown in FIG. That is, the locking flange portion 6 is provided over the entire circumference of the main body flange portion 4 so as to project outward O.

The inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid are formed so that their respective inclination angles are substantially the same.

The outer peripheral wall 8 of the lid has a plurality of locked convex portions 8a. Each locked convex portion 8a is formed in a convex shape, and in the left half of FIG. 4, it protrudes in the right direction R in the width direction W, and in the right half, it protrudes in the left direction L in the width direction W. As shown in FIG. 5, each locked convex portion 8a is formed elongated along the outer peripheral wall 8 of the lid, and is arranged in an annular shape and discontinuously. FIG. 6 is a plan enlarged view of a portion of the container lid 3 shown by the virtual line S in FIG.

The lid outer peripheral wall 8 constitutes a lid outer peripheral wall recess 8b that is recessed outward O on the lower side of the lid flange contact surface 5a in the vertical direction V and on the upper side of each locked convex portion 8a.

FIG. 7 shows a front sectional view of a container with a lid 1 in a state where the container lid 3 is fitted to the open container main body 2. In this state, the opening container body 2 does not undergo secondary shrinkage. Further, the lid flange contact surface 5a is in close contact with the main body flange contact surface 4a from above V in the vertical direction. Such a fitting state before the secondary shrinkage is hereinafter referred to as a fitting state Bs before the secondary shrinkage.

The dimensions of the open container body 2 and the container lid 3 are such that in the fitted state Bs before secondary shrinkage, the plan view shape formed by the tip of the outward O of the locking flange portion 6 is the plan view shape formed by the lid outer peripheral wall recess 8b. The dimensions are set to be the same as or slightly smaller than the plan view shape formed by the lid outer peripheral wall recess 8b.

Further, the height H1 in the vertical direction V from the locking flange portion 6 to the lid flange contact surface 5a is higher than the height H2 in the vertical direction V from the upper end of each locked convex portion 8a to the lid flange contact surface 5a. The dimensions are set so that they are smaller.

Further, the dimensions of the open container main body 2 and the container lid 3 are set so that the main body flange portion 4 is accommodated from the vertical V lower side of the lid flange portion 5 in the pre-secondary shrinkage fitting state Bs.

Moreover, the dimensions of the opening container body 2 and the container lid 3 are such that the recess 3c of the container lid 3 is located above the vertical V of the step portion 2b of the opening container body 2 in the pre-shrinkage fitting state Bs. Set to dimensions.

With such a configuration, the lid flange portion 5 can be externally fitted to the main body flange portion 4, and the container lid 3 can be externally fitted to the open container main body 2 as the whole container with lid 1. By this outer fitting, the container 1 with a lid reaches the fitting state Bs before the secondary shrinkage, and the container lid 3 seals the open container main body 2.

Further, since the locking flange portion 6 of the opening container body 2 locks the locked convex portion 8a of the container lid 3 downward to D, the container lid 3 does not come off from the opening container body 2 and is secondary. The pre-shrinkage fitting state Bs is maintained. At this time, the locking flange portion 6 is fitted into the lid outer peripheral wall recess 8b.

When the user fits the container lid 3 to the open container main body 2 or intentionally removes the container lid 3 from the open container main body 2, the open container main body 2, the container lid 3, or the open container main body 2 and The container lid 3 is slightly elastically deformed, the locking flange portion 6 is fitted into the lid outer peripheral wall recess 8b, and the locked convex portion 8a is locked by the locking flange portion 6, or the locking flange portion 6 is used. Is removed from the lid outer peripheral wall concave portion 8b, and the locked state of the locked convex portion 8a by the locking flange portion 6 is released. Since both the opening container body 2 and the container lid 3 are molded products made of a synthetic resin sheet, they can be easily deformed for locking or releasing the locked state.

Further, since each locked convex portion 8a is discontinuously arranged, the friction generated between the opening container main body 2 and the container lid 3 can be reduced, and the locking or engaging portion is locked by the locking flange portion 6. The stopped state can be easily released. Moreover, each locked convex portion 8a is arranged so as to be symmetrical in the left-right front-rear direction in the width direction W and the depth direction Y, as shown in FIGS. 5 and 6 in the plan view of the container lid 3. Therefore, the degree of difficulty in fitting or removing the container lid 3 due to the locking flange portion 6 locking the locked convex portion 8a can be set substantially uniformly on the left, right, front and back of the container with the lid 1. ..

The lid inner peripheral wall 9 is disposed apart from the inside of the main body inner peripheral wall 7 in the fitting state Bs before secondary contraction. In the front end view of the EE cross section in which the left side flange portions 4 and 5 in the mated state Bs before the secondary contraction are enlarged in FIG. 8, the inner peripheral wall 9 of the lid is relative to the inner peripheral wall 7 of the main body in the EE cross section. The distance wd before the secondary contraction of the EE cross section, which is the distance separated in the horizontal direction H, is shown.

In this state, the main body flange contact surface 4a and the lid flange contact surface 5a come into contact with each other. Then, the lid flange portion 5 is externally fitted to the main body flange portion 4, so that the container lid 3 is externally fitted to the open container main body 2 as the whole container with lid 1.

Here, the dimensions of the opening container body 2 and the container lid 3 are such that the distance wd before the secondary contraction of the EE cross section is the distance between the left and right inner peripheral walls 7 of the main body shown in FIG. It is set to be 1/2 of the distance from w1 minus the distance w2 between the inner peripheral walls 7 of the left and right main bodies after the opening container main body 2 has undergone secondary contraction. do. Such a distance of (w1-w2) / 2 is called an EE cross-section secondary contraction allowance wa. That is, the dimensions of the opening container body 2 and the container lid 3 are set so that the separation distance wd before the secondary shrinkage of the EE cross section corresponds to the secondary shrinkage allowance wa of the EE cross section.

Regarding the relationship between the dimensions before the secondary shrinkage and the dimensions after the secondary shrinkage, when the raw material of the opening container body 2 is, for example, crystalline polyethylene terephthalate (C-PET), the ratio is 2/1000 to 18/1000. It is known that there is.

FIG. 9 shows a state in which the opening container main body 2 causes secondary shrinkage due to heating, and the inner peripheral wall 7 of the main body on the left side shown in FIG. 2 is displaced to the right R by the distance of the secondary shrinkage allowance wa in the EE cross section. While the inner peripheral wall 7 of the main body on the left side is displaced to the right R, the lid flange contact surface 5a is in close contact with the main body flange contact surface 4a as in the case before the secondary shrinkage. Further, the lower surface of the recessed portion 3c of the container lid 3 abuts on the upper surface of the stepped portion 2b of the opening container main body 2.

As shown in FIG. 8, the inner peripheral wall 9 of the lid was located inward in the horizontal direction H with respect to the inner peripheral wall 7 of the main body by the separation distance wd before the secondary contraction in the EE cross section in the fitted state Bs before the secondary contraction. When the opening container body 2 is covered again with the container lid 3 after the secondary contraction of the opening container body 2, the inner peripheral wall 7 of the main body has an EE cross-sectional secondary contraction allowance wa corresponding to the separation distance wd before the secondary contraction of the EE cross-section. Since the distance is displaced inward I, the inner peripheral wall 7 of the main body comes into contact with and adheres to the inner peripheral wall 9 of the lid. As a result, the lid flange portion 5 is internally fitted to the main body flange portion 4, and the container lid 3 can be internally fitted to the open container main body 2 as the whole container with lid 1. Such a fitting state after the secondary shrinkage is hereinafter referred to as a fitting state As after the secondary shrinkage.

In the fitted state As after the secondary shrinkage, the container lid 3 seals the open container body 2.

Further, since the inner peripheral wall 9 of the lid is inclined so as to be located inward toward the upper side in the vertical direction V, and the inner peripheral wall 7 of the main body is also inclined in the same manner, the container lid 3 is opened in the fitted state As after the secondary shrinkage. Even when a force for pulling upward from the main body 2 acts, the inner peripheral wall 7 of the main body can lock the container lid 3 downward D and maintain a sealed state.

When the user fits the container lid 3 to the open container main body 2 or intentionally removes the container lid 3 from the open container main body 2, the open container main body 2, the container lid 3, or the open container main body 2 and The container lid 3 is slightly elastically deformed, and the inner peripheral wall 9 of the lid is rubbed against the inner peripheral wall 7 of the main body to move downward D or upward U. Since both the opening container body 2 and the container lid 3 are molded products made of a synthetic resin sheet, they can be easily deformed for locking or releasing the locked state.

8 and 9 show the end face of the front cross section of the EE cross section, but the side cross section of the FF cross section with arrows in FIGS. 3 and 5 and the cross section from other angles are also open containers. The main body 2 and the container lid 3 are configured in the same manner. For example, in the FF cross section, the inner peripheral wall 7 of the main body on one of the left and right sides faces the distance of the secondary contraction allowance ya in the FF cross section (not shown) to the right.
Displaces to contact the inner peripheral wall 9 of the lid and adheres to it. That is, with respect to the entire circumference of the container with a lid, the lid flange portion 5 is in close contact with the lid inner peripheral wall 9 in contact with the lid inner peripheral wall 9 in the fitted state As after secondary shrinkage, so that the lid flange portion 5 is in close contact with the main body flange portion 4. The container lid 3 can be internally fitted to the open container body 2 as a whole of the container with a lid 1.

In FIG. 10, CS1 illustrates an embodiment of the first method of attaching and detaching the container lid of the present invention. The first method for attaching / detaching the container lid CS1 is a container lid that fits the container 1 with a lid as described above with an open container body 2 that is thermoformed from a synthetic resin sheet and has a property of being thermoformed by heating. It is a method of attaching and detaching 3.

First method for attaching / detaching the container lid In the container 1 with a lid before performing CS1, for example, the container lid 3 is detachably fitted into the open container body 2 in a state where the food F that can be cooked is filled in the open container body 2. It is in a state of matching. The food F at this time is at room temperature.

Similarly, in order to sterilize the inside of the container 1 with a lid with superheated steam, for example, the open container main body 2 may be placed in an unfilled state.

Then, before the first container lid attachment / detachment method CS1 is performed, the container with a lid 1 is in the pre-secondary shrinkage fitting state Bs. That is, as shown in FIGS. 1, 7 and 8, the lid flange portion 5 is externally fitted to the main body flange portion 4, whereby the container lid 3 is externally fitted to the open container main body 2.

In the first container lid attachment / detachment method CS1, the container lid removal step S1 for removing the container lid 3 from the open container main body 2, the heating step S2 for heating the open container main body 2, and the container lid 3 for the open container main body 2 are sequentially performed. Includes a refitting step S3 for internal fitting.

In the container lid removing step S1, the flange-shaped locking flange portion 6 projecting upward from the flange portion of the main body, which is a flange portion provided in an annular shape, and the flange-shaped locking flange portion 6 projecting outward at the peripheral edge of the opening container main body 2, and the container lid. With the convex locked convex portion 8a protruding inward I from the outer peripheral wall 8 of the lid, which is the peripheral wall of the lid flange portion 5 which is a flange portion provided in an annular shape and protrudes upward at the peripheral edge of the lid. The step S1a for releasing the locked state is included.

In step S1a for releasing the locked state between the locking flange portion 6 and the locked convex portion 8a, after releasing the locked state, the container lid 3 is pulled upward from the opening container body 2 upward U. Since the container lid 3 thus removed is used in the refitting step S3, it is also stored during the heating step S2 described later.

In the container removal step S1, the user of the container 1 with a lid, such as a consumer or a business operator, is filled with food F immediately after being purchased / carried in from a convenience store, a supermarket, a supplier, a factory, or the like. The open container main body 2 is in a state where it can be heated by a heating device such as a microwave oven, an oven, or a baking line. Alternatively, the inside of the container with a lid 1 can be sterilized and disinfected with superheated steam.

In the heating step S2, after the user such as a consumer or a business operator removes the container lid 3 from the opening container main body 2, the opening container main body 2 is filled with food F such as prepared foods, noodles, and confectionery. Includes the step of cooking food F by heating it with a heating device such as a microwave oven, an oven, or a baking line. Alternatively, after the user such as a business operator removes the container lid 3 from the open container main body 2, the open container main body 2 in an unfilled state is exposed to superheated steam or the like, and the open container main body 2 is heated by heat. Includes steps to sterilize.

The opening container body 2 is heated by cooking the food F and sterilizing it with superheated steam. At this time, the temperature of the open container body 2 rises to 110 ° C. or higher, causing secondary shrinkage. That is, by passing through the heating step S2 for heating the opening container main body 2, the opening container main body 2 causes a secondary contraction. The distance between the peripheral walls before the contraction w1 decreases to the distance w2 between the peripheral walls after the secondary contraction of the EE cross section.

Among the prepared foods and confectioneries mentioned above, it is known that when gratin or baked confectionery is cooked, the temperature is raised to 150 ° C. or 230 ° C., respectively.

On the other hand, when the raw material of the container lid 3 uses a raw material that does not cause secondary shrinkage, it does not cause secondary shrinkage even after the heating step S2. Further, even when a raw material that causes secondary shrinkage is used, the container lid 3 does not cause secondary shrinkage because it has already been removed from the open container body 2. As a result, only the opening container main body 2 undergoes the secondary shrinkage through the heating step S2.

In the refitting step S3, the container lid 3 stored during the heating step S2 is combined with the open container main body 2 heated and shrinked by the heating step S2, and the open container main body 2 is covered by the container lid 3. Includes a step to cover.

Further, the refitting step S3 includes a step S3a in which the lid flange portion 5 is internally fitted to the main body flange portion 4 so that the main body inner peripheral wall 7 and the lid inner peripheral wall 9 are in contact with each other. In this refitting step S3, the container lid 3 is internally fitted to the open container body 2.

Users such as consumers do not immediately eat foods F such as prepared foods and noodles cooked by microwave ovens, but spend a certain amount of time for storage, movement, steam and additional cooking over time. I may eat it after I'm there. Further, a user such as a business operator may distribute foods F such as prepared foods and confectionery cooked by, for example, an oven, a baking line, etc. in a packaged state.

In such a case, in order to steam the food F, prevent the food F from spilling, and prevent foreign substances from being mixed into the food F, the user can use the first container lid attachment / detachment method CS1 of the present invention to prevent the container lid 3 from being mixed. This allows the open container body 2 to be covered and the container lid 3 to be refitted to the open container body 2. In the refitting step S3, the inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid are in contact with each other to be sealed. Can be done.

Businesses such as convenience stores and supermarkets cook the food F filled in the open container body 2 in these stores and cover it again with the container lid 3 to match the sales. Freshly prepared and appropriate quantity of cooked food can be lined up in the store.

Even when the opening container body 2 is sterilized and disinfected, the user covers the opening container body 2 again with the container lid 3 in order to maintain the sterilized state or the sterile state inside the opening container body 2.

In the container 1 with a lid used in the container lid attachment / detachment method CS1 of the present invention, the lid flange portion 5 is externally fitted to the main body flange portion 4 in the pre-secondary shrinkage fitting state Bs, and the lid flange contacts the main body flange contact surface 4a. The surfaces 5a come into contact with each other to prevent leakage of the contents. On the other hand, in the fitted state As after the secondary contraction, the inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid, which are located inside the contact surfaces 4a and 5a, are in contact with each other and sealed, so that the contents leak. The fear of giving out is smaller.

Further, when the inner peripheral walls 7 and 9 are inclined, one of them locks the other, so that the degree of sealing is higher.

The method for attaching / detaching the container 1 with a lid and the first container lid CS1 of the present invention utilizes the heat-shrinkable property of the open container body 2 due to the unique structure of the open container body 2 and the container lid 3 used for these. A strong internal fitting between the open container body 2 and the container lid 3 is realized.

Moreover, the container lid 3 used in the pre-shrinkage fitting state Bs can be shared in the post-secondary shrinkage fitting state As. Therefore, the container lid 3 removed in the container lid removal step S1 can be used as it is for the refitting step S3, and another container lid 3 that matches the dimensions of the open container body 2 after heat shrinkage is prepared. There is no need.

In FIG. 11, CS11 exemplifies the method of attaching and detaching the second container lid of the present invention. The second container lid attachment / detachment method CS11 includes, in order, a container lid removal step S11, a filling step S12, and a refitting step S13.

Second method of attaching / detaching the container lid The container 1 with a lid before performing CS11 is in the fitted state Bs before secondary shrinkage, the open container body 2 is not filled with anything, and the container lid 3 is the open container body. It is placed in a state where it can be detachably fitted to 2.

The container lid removing step S11 has the same configuration as the container removing step S1 of the above-described embodiment, and also includes a step S11a for releasing the locked state between the locking flange portion 6 and the locked convex portion 8a. ..

A user such as a consumer or a business operator brings the prepared open container main body 2 of the container 1 with a lid into a state in which the contents such as food F can be filled by the container removal step S11.

Next, in the filling step S12, the food F in a high temperature state is filled in the opening container main body 2. The food F to be filled is, for example, prepared foods, noodles, etc., and is heated to 110 ° C. or higher. By filling the food F in such a high temperature state, the opening container main body 2 is heated. At this time, the temperature of the open container body 2 rises to 110 ° C. or higher, causing secondary shrinkage. That is, after passing through the filling step S12, the opening container main body 2 undergoes secondary shrinkage. For example, in the case of an EE cross section, the distance between the left and right main body inner peripheral walls 7 is from the distance w1 before the secondary shrinkage of the EE cross section. After the secondary contraction of the EE cross section, the distance between the peripheral walls is reduced to w2.

Finally, the refitting step S13 has the same configuration as the refitting step S3 of the embodiment described above, and the container lid 3 stored during the filling step S12 is thermally shrunk by the filling step S12. Including a step of combining with the opening container main body 2 and covering the opening container main body 2 with the container lid 3. As a result, the container 1 with a lid reaches the fitted state As after the secondary contraction. In addition, the configuration of the second container lid attachment / detachment method CS11 is the same as the configuration of the first container lid attachment / detachment method CS unless otherwise specified.

Users such as consumers do not immediately eat food F such as prepared foods and noodles filled in a high temperature state, but wait for a certain period of time for storage, movement, steam and additional cooking over time. I may eat from. In addition, users such as businesses may distribute foods F such as prepared foods and confectionery filled in a high temperature state in a packaged state.

In such a case, in order to steam the food F, prevent the food F from spilling, and prevent foreign substances from being mixed into the food F, the user can use the container lid attachment / detachment method CS11 of the present invention to open the container by the container lid 3. The main body 2 can be covered, and the container lid 3 can be refitted to the open container main body 2. In the refitting step S13, the inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid are in contact with each other to be sealed. Can be done.

With the above configuration, in the method for attaching / detaching the container 1 with a lid, the container lid 3 and the container lid CS1 and CS11 of the present invention, the container lid 3 makes the open container body 2 before and after the heat shrinkage of the open container body 2. Allows for sealing.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, the planar shape of the container with a lid 1, the open container main body 2, the container lid 3, the main body flange portion 4 and the lid flange portion 5 may be a shape other than the substantially oval shape as shown in each figure, and is shown in FIG. 8 over the entire circumference. And, if the cross-sectional structures of the main body flange portion 4 and the lid flange portion 5 in the pre-shrinkage fitting state Bs and the post-secondary shrinkage fitting state As as shown in FIG. 9 can be provided, they are rectangular, elliptical, and poly. It may have a rectangular shape, a circular shape, or the like. As a modification, the plan shape of the container with a lid, the opening container main body, the container lid, the main body flange portion, and the lid flange portion may be formed in a circular shape. For example, a circular container lid is shown in the plan view of FIG. There is.

Further, the main body flange contact surface 4a and the lid flange contact surface 5a may be formed on a surface other than the flat surface as shown in each figure, and all of them are in the pre-shrinkage fitting state Bs and the post-secondary shrinkage fitting state As. As long as they are in close contact with each other over the circumference, they may be formed on a curved surface bulging upward U, a curved surface bulging downward D, or the like.

Further, the inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid may be formed on a surface other than the flat surface as shown in each figure, and if they come into contact with each other over the entire circumference in the fitted state As after the secondary contraction and are in close contact with each other, the outward O It may be formed on a curved surface bulging inward, a curved surface bulging inward I, or the like.

The main body flange portion 4 has a main body outer peripheral wall on the outer side, and in the mated state Bs before secondary shrinkage, the lid outer peripheral wall 8 abuts inward I on the main body outer peripheral wall, so that the lid flange portion 5 becomes the main body flange portion. It may be configured to be externally fitted to 4. Further, at this time, the outer peripheral wall of the main body and the outer peripheral wall of the lid 8 may be inclined so as to be located on the outer side toward the upper side, and the outer peripheral wall of the main body may lock the outer peripheral wall 8 of the lid downward D.

Even if the inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid are not inclined, if the fitted state can be maintained by friction between the inner peripheral walls 7 and 9 in the fitted state As after the secondary contraction, for example, in the vertical direction. It may stand upright on V.

The material of the container lid 3 may be a material other than the synthetic resin sheet, and the open container main body 2, the container lid 3, or the open container main body 2 and the container lid 3 are elastically deformed as necessary for removal and fitting. If possible, materials other than synthetic resins such as paper, wood, and glass may be used. Further, the container lid 3 may be a molded product obtained by thermoforming, or may be obtained by casting, laminating, cutting, cutting, compression molding, or the like.

For the purpose of removing the container lid 3 from the container 1 with a lid in the container removal step S1, examples of cooking, filling of food F in a high temperature state, and sterilization and disinfection with superheated steam have been given. It may be for purposes such as surface processing with heating, molding, and coating. Further, the reason for heating the opening container main body 2 in the heating step S2 may be due to these purposes.

Although cooking is taken as an example for the purpose of heating food F, it may be for purposes other than cooking such as reheating food F and high temperature sterilization. Further, although food F is taken as an example of the content to be filled in the opening container main body 2, solids, semi-solids, liquids and the like other than food F such as chemicals, cosmetics and chemicals may be used.

As an example of the temperature at which secondary shrinkage occurs, 110 ° C. in the case of PET-based resin is given as an example, but this temperature varies depending on the type of synthetic resin used for the opening container main body 2.

The case where only the open container main body 2 causes the secondary shrinkage and the container lid 3 does not cause the secondary shrinkage is given as an example, but even when the container lid 3 causes thermal shrinkage due to a shrinkage rate smaller than that of the open container main body 2. , The separation between the inner peripheral wall 7 of the main body and the inner peripheral wall 9 of the lid in the pre-secondary shrinkage fitting state Bs such as the EE cross section before the secondary shrinkage distance wd according to the difference in the shrinkage rate between the open container main body 2 and the container lid 3. All you have to do is set the distance.

The present invention can be used for a container with a lid that requires sealing between the opening container body and the container lid.

1 Container with lid 2 Open container main body 3 Container lid 4 Main body flange part 4a Main body flange contact surface 5 Lid flange part 5a Lid flange contact surface 6 Locking flange part 7 Main body inner peripheral wall 8 Lid outer peripheral wall 8a Locked convex part 8b Lid Outer peripheral wall recess 9 Lid inner peripheral wall CS1 First container lid attachment / detachment method CS11 Second container lid attachment / detachment method S1, S11 Container removal step S2 Heating step S12 Filling step S3, S13 Refitting step

Claims (9)

A container with a lid provided with an open container body and a container lid that is detachably fitted to the open side of the open container body.
The opening container body is thermoformed from a synthetic resin sheet and has the property of being thermoformed by heating.
The open container main body and the container lid have a main body flange portion and a lid flange portion which are flange portions provided in an annular shape and project toward the opening of the open container main body at their respective peripheral edges.
The container lid is a container with a lid, wherein the lid flange portion is internally fitted to the main body flange portion and fitted to the open container main body after heat shrinkage of the open container main body due to the heating. A container with a lid provided with an opening container body that opens upward in the vertical direction and a container lid that is detachably fitted to the opening side of the opening container body.
The opening container body is thermoformed from a synthetic resin sheet and has the property of being thermoformed by heating.
The open container main body and the container lid have a main body flange portion and a lid flange portion, which are flange portions that protrude upward and are provided in an annular shape on their respective peripheral edges.
In the fitted state, the lid flange portion is externally fitted to the main body flange portion, and is arranged at a distance inward from the inner peripheral wall of the main body, which is a peripheral wall that the main body flange portion has inside in the horizontal direction. It has a lid inner peripheral wall which is a peripheral wall to be provided, and the lid inner peripheral wall is characterized in that the distance equivalent to the heat shrinkage allowance in the horizontal direction of the main body inner peripheral wall is separated from the main body inner peripheral wall. Container with lid. The container with a lid according to claim 2, wherein the inner peripheral wall of the main body and the inner peripheral wall of the lid are inclined so as to be located inward toward the upper side in the vertical direction, respectively. The main body flange portion has a flange-shaped locking flange portion that projects outward in the horizontal direction.
It has a convex locked convex portion that protrudes inward in the horizontal direction from the outer peripheral wall of the lid, which is the peripheral wall of the lid flange portion on the outer side in the horizontal direction.
The container with a lid according to claim 2 or 3, wherein the locking convex portion locks the locked flange portion downward in the vertical direction in the fitted state. A container lid that covers the main body of an open container to form a container with a lid.
It has a lid flange portion that protrudes toward the opening of the opening container body at the peripheral edge and is provided in an annular shape.
A container lid characterized in that after the heat shrinkage of the opening container body due to heating, the lid flange portion is internally fitted to the opening container body to cover the opening container body. It is a method of attaching and detaching a container lid that attaches and detaches a container lid that fits with the opening container body to an opening container body that is thermoformed from a synthetic resin sheet and has a property of heat shrinking by heating.
A container lid removing step of removing the container lid that is externally fitted to the opening container body from the opening container body,
After the container lid removing step, a heating step of heating the opening container body and a heating step
After the heating step, the container lid is attached and detached, which comprises a refitting step of internally fitting the container lid removed in the container lid removing step into the open container body which has been heat-shrinked in the heating step. Method. The open container main body and the container lid have a main body flange portion and a lid flange portion, which are flange portions provided in an annular shape and project upward in the vertical direction at their respective peripheral edges.
In the outer fitting state before the container lid removing step, the inner peripheral wall of the lid, which is a peripheral wall disposed inwardly from the inner peripheral wall of the main body, which is the peripheral wall of the main body flange portion on the inner side in the horizontal direction, is described. The lid flange portion has the inner peripheral wall of the lid separated from the inner peripheral wall of the main body by a distance equivalent to the heat shrinkage allowance of the inner peripheral wall of the main body in the horizontal direction.
The container lid removing step projects inward from the flange-shaped locking flange portion that protrudes outward from the main body flange portion and the outer peripheral wall of the lid that is the peripheral wall of the lid flange portion on the outside. Including the step of releasing the locked state with the convex locked convex portion.
In the refitting step, the opening container main body is covered with the container lid, and the lid flange portion is internally fitted to the main body flange portion so that the inner peripheral wall of the main body and the inner peripheral wall of the lid are in contact with each other. The method for attaching and detaching a container lid according to claim 6, further comprising a step. It is a method of attaching and detaching a container lid that attaches and detaches a container lid that fits with the opening container body to an opening container body that is thermoformed from a synthetic resin sheet and has a property of heat shrinking by heating.
A container lid removing step of removing the container lid that is externally fitted to the opening container body from the opening container body,
After the container lid removing step, a filling step of filling the open container body with food in a high temperature state,
After the filling step, the container lid is attached / detached, comprising a refitting step of internally fitting the container lid removed in the container lid removing step into the heat-shrinked open container body in the filling step. Method. The open container main body and the container lid have a main body flange portion and a lid flange portion, which are flange portions provided in an annular shape and project upward in the vertical direction at their respective peripheral edges.
In the outer fitting state before the container lid removing step, the inner peripheral wall of the lid, which is a peripheral wall disposed inwardly from the inner peripheral wall of the main body, which is the peripheral wall of the main body flange portion on the inner side in the horizontal direction, is described. The lid flange portion has the inner peripheral wall of the lid separated from the inner peripheral wall of the main body by a distance equivalent to the heat shrinkage allowance of the inner peripheral wall of the main body in the horizontal direction.
The container lid removing step projects inward from the flange-shaped locking flange portion that protrudes outward from the main body flange portion and the outer peripheral wall of the lid that is the peripheral wall of the lid flange portion on the outside. Including the step of releasing the locked state with the convex locked convex portion.
In the refitting step, the opening container main body is covered with the container lid, and the lid flange portion is internally fitted to the main body flange portion so that the inner peripheral wall of the main body and the inner peripheral wall of the lid are in contact with each other. The method for attaching and detaching a container lid according to claim 8, further comprising a step.

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