JPH0880959A - Container with sealing lid - Google Patents

Abstract

PURPOSE: To make a fluid content hard to leak out, and improve the sealability by a method wherein an annular bent part of which the cross section is hook-shaped, and which has a recessed or protruding engaging part is provided on the outer peripheral edges of a container and lid, and the recessed and protruding engaging parts are fitted to each other by pressing in the vertical direction. CONSTITUTION: An annular bent part 2 of which the cross section is hook-shaped is provided on the opening side of a square container 1, and an annular bent part 12 of which the cross section is hook-shaped is provided on a square lid 11. When the annular bent part 2 and annular bent part 12 are fitted to each other by pressing in the vertical direction, a protruding part 15 for engaging on the outer edge fitting surface is engaged with a recessed part 5 for engaging, and the lid is prevented from slipping off. In this case, a diameter D1 of an annular protruding corner 14a at the lower end of a fitting surface 14 at the mouth edge of a bent part of the lid 11 is larger than an internal diameter d1 at a contact area of a fitting surface 4 at the mouth edge of a bent part of the container 1. Therefore, the annular protruding corner 14a on the lower end of the fitting surface 14 is pressed to the fitting surface 4 at the mouth edge of the bent part of the container 1, and annularly comes into contact with the fitting surface 4. In addition, the radii of curvature for the edges of the container 1 and lid 11 are adjusted in such a manner that a pushing in quantity may gradually increase toward the central part of the edge at an annular linear contact area on the container, and even when the edges of the container 1 are expanded due to the liquid pressure of a content, the contact pressure is equalized, and a high sealability is retained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-made or paper-made lidded container in a supermarket or in a store, in which liquids, foods, etc., such as prepared foods containing fluid such as broth, can be put.

[0002]

2. Description of the Related Art Various types of containers with lids made of resin or paper that are lined up in stores are known in various shapes. Among them, the container 101 shown in FIG. Annular bent portion 101a whose outer edge has a hook-shaped cross section outward
Then, the ring-shaped bent portion 102a of the lid 102 is fitted.

This fitting is performed by fitting the outer edge fitting surface 1 of the annular bent portion 101a of the container 101 as shown in the partially enlarged view of FIG.
The angle θ10 at which the lid entrance side of 01b is opened, that is, has a large diameter
The tapered surface of No. 1 and the tapered surface of the outer edge fitting surface 102b of the annular bent portion 102a of the lid 102 are formed at substantially the same angle, and the mouth edge fitting surface 101c of the container 101a has a smaller diameter on the lid inlet side, that is, a smaller diameter. The taper surface of the angle θ102 and the taper surface of the lip fitting surface 102c of the lid 102 are formed at substantially the same angle to form a dovetail shape, and the direction opposite to the normal taper fitting, that is, the small diameter portion is the large diameter end. Due to the fitting over the lid, the lid is made hard to separate from the container.

Further, in the enlarged view of the fitting portion of another embodiment shown in FIG. 13, the mouth fitting surfaces 101c and 102c are formed straight or have a taper in which the entrance is opened by a draft and the taper is opposite to the outer edge side. The fitting prevents the lid from coming off the container.

[0005]

The contact pressure is weak on the mating surface having the dovetail cross section shown in FIG. 12 described in the prior art, and the entire circumferences of both surfaces are not always in close contact with each other. . In the latter case of the sectional shape of FIG. 13, the lid 102 and the container 101 are fitted only by the outer edge fitting surface 101b of the annular bent portion and the tapered surface of the outer edge fitting surface 102b of the annular bent portion. Similarly, the contact pressure is weak and the entire circumference is not always in close contact, and when a prepared dish containing fluid such as broth is put in the container, the broth will flow out during transportation or when placed. Had the problem of doing.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to enhance the airtightness with the container when the lid is capped and the fluid inside. It is an object of the present invention to provide an airtight container with a lid of stable quality, which is a method that does not easily flow out and is not expensive.

[0007]

In order to achieve the above object, the present invention provides a resin or paper-made polygon in an annular bent portion of a hook-shaped cross section extending outward from the mouth line of a resin or paper-made polygonal container. A container with a lid for crowning an annular bent portion of a lid having a shape, wherein the annular bent portion and an engaging concave portion engageably engageably engage with lower ends of outer edge fitting surfaces of the annular bent portion. A convex part is formed, the mouth fitting surface of the annular bent part is narrowed and the taper is formed arbitrarily, and the mouth fitting surface of the annular bent part crowned on the fitting surface of this taper is narrowed And formed with a taper having a larger angle than the taper, and the lower end thereof is formed into an annular convex corner portion that makes linear contact with the ring when fitted,
In the annular linear contact portion, the lip fitting surface is formed so that the pushing amount gradually increases toward the central portion of the polygonal side.

Further, the container and the lid are oval instead of polygonal.

Further, the engaging concave portion at the lower end of the outer edge fitting surface of the container is removed and the engaging convex portion at the lower end of the outer edge fitting surface of the lid is engaged with the lower end.

The outer edge fitting surfaces of the container and the lid are removed.

Further, the polygonal side of the linear contact portion of the lip fitting surface of the container is an outward convex arc, and the outward convex arc of the polygonal side of the linear contact portion of the lid fitting surface of the lid is the above-mentioned. It has a smaller curvature than a convex arc.

Further, the polygonal side of the linear contact portion on the lip fitting surface of the container is a straight line, and the polygonal side of the linear contact portion on the lip fitting surface of the lid is an outward convex arc.

Also, the polygonal side of the linear contact portion of the mouth fitting surface of the container is an inward convex arc, and the polygonal side of the linear contact portion of the mouth fitting surface of the lid is a straight line. is there.

Further, the polygonal side of the linear contact portion of the mouth fitting surface of the container is an inward convex arc, and the polygonal side of the linear contact portion of the lid fitting surface of the lid is an inward convex arc. The curvature is larger than the curvature of the inwardly convex arc.

Further, a container with a lid for fitting a resin or paper lid whose fitting portion has a similar shape to the inside of a non-circular container made of resin or paper, which is located at the position of the mouth of the container In the above, the two are formed in a shape of annular linear contact fitting, and the container and the lid are formed to a size that compensates for the decrease in the contact pressure toward the center between the corners of the fitting part. is there.

[0016]

According to the present invention, when the lid 11 is capped on the container 1 and the annular bent portion 12 and the annular bent portion 2 are vertically pressed and fitted, the engaging protrusions on the outer edge fitting surface on the lid side. The portion 15 engages with the engagement recess 5 or the lower end of the outer edge fitting surface on the container side, and the fitting edge surface of the container and the annular convex corner portion of the fitting edge surface of the lid are in an annular line contact state. When fitted, the lid is prevented from coming off and sealed. The pushing pressure becomes larger toward the center between the corners of the polygon, which compensates for the decrease in the contact pressure due to the opening of the container due to the hydraulic pressure from the inside, and the weaker line contact pressure due to manufacturing errors. Is added to maintain a perfect seal.

According to a second aspect of the present invention, the central portion of the side of the ellipse in the major axis direction is expanded by the internal pressure of the liquid, and the decrease of the line contact pressure is compensated for by the gradually pushing amount of the annular convex corner of the lid toward the central portion of the side.

According to a fourth aspect of the present invention, the ceiling of the annular bent portion of the container and the ceiling of the annular bent portion of the lid come into contact with each other to define the contact position between the fitting surface of the container rim and the annular convex corner portion of the lid, thereby making line contact. The contact pressure does not decrease due to the gradually increasing amount of pushing in the central part of the side of the polygon, and the sealing is ensured.

According to a fifth aspect of the present invention, the curvature of the convex arc of the polygonal side of the lid is made smaller than the curvature of the convex arc of the polygonal side of the container so that the wall of the container is pushed out. Also, the line contact pressure is compensated for and the high sealing performance is obtained.

According to the sixth aspect of the present invention, since the polygonal sides of the container are straight lines, the central portion is pushed out by the convex arc of the lid, and the reduction of the line contact pressure due to the internal pressure of the liquid is compensated for, and high sealing performance is obtained.

According to a seventh aspect, the inward convex arc of the polygonal side of the container is pushed by the internal pressure of the liquid so that the side is close to a straight line, and the line contact pressure is averaged and high due to contact with the straight line of the side of the lid. Sealability is obtained.

According to the eighth aspect of the present invention, the inwardly convex arc of the polygonal side of the container has a large curvature, whereas the inwardly convex arc of the lid has a large curvature.
Even if the convex arc of the container is expanded by the internal pressure of the liquid and the curvature of the convex arc increases, the line contact pressure is averaged close to the convex arc of the lid having a large curvature, and high sealing performance is obtained.

[0023]

[Examples] Vacuum or pressure molding with a thermoplastic resin sheet, injection molding or blow molding (hollow molding) using pellets of a thermoplastic resin, paper sheet, artificial paper,
Alternatively, as shown in FIG. 1, the container 1 made by press-molding a mixed material of resin and paper has a barrel-shaped quadrangular shape so that the body part is drafted so that the mouth side is opened so that it can be easily released from the mold. It is shaped like a truncated pyramid. An annular bent portion (hereinafter referred to as a bent portion) 2 having a hook-shaped cross section is formed on the outer edge of the lip for reinforcement.

The bent portion 2 has a flat ceiling, the outer edge fitting surface 3 is a surface perpendicular to the bottom surface or an inverse taper with a large diameter on the lid inlet side, and the lower end is engaged annularly inwardly. The concave portion 5 is formed, and the inner edge fitting surface 4 of the bent portion 2 is formed in a reverse taper, which has a small diameter on the lid inlet side and is arbitrarily narrowed. The taper angle θ _{1 on the} outer edge side is 0 ° to 10 °, the taper angle θ _{2 on the} mouth edge side
Is in the range of 1 ° to 10 °, preferably 2 ° to 6 °.

A tongue piece 7 is formed at a lower end of a part of the outer edge fitting surface 3 of the bent portion so as to project laterally at a right angle. The tongue piece 7 has a diagonal line which does not include the tongue piece of the container 1. In parallel, an oval concave fitting portion 6 that serves as a female hook is formed, and the concave fitting portion 6 is formed in a dovetail shape with a widened bottom. Further, a tongue piece 8 serving as a knob at a right angle to the lower end of the bent-edge outer edge fitting surface 3 is provided so that the lid 11 can be easily opened at a corner portion opposite to the tongue piece 7.
Are formed.

As shown in FIG. 2, the lid 11 to be capped on the container 1 is in the shape of a barrel and has an annular bent portion with a hook-shaped cross section that engages with the bent portion 2 of the container 1 (hereinafter referred to as a bent portion). 12
Is formed on the bent portion 12, and the outer edge fitting surface 13 that closely fits the outer edge fitting surface 3 of the bent portion of the container 1 and the bent edge fitting surface 4 of the container 1 are covered. A mating lip fitting surface 14 is provided.

The lower portion of the bent-portion edge fitting surface 14 is formed in a reverse taper having a large diameter, and the taper angle θ ₄ is θ.
_The angle is 1 ° or more, preferably 2 ° to 10 ° larger than 2. Further, in the bent portion lip fitting surface 14, the outer diameter D ₁ of the lower annular convex corner portion 14a shown in FIG. 3 is slightly smaller than the inner diameter d ₁ of the abutting portion of the bent portion lip fitting surface 4 of the container 1, for example, 0.
1 to 0.5 mm, preferably 0.2 mm larger in size. Since the rim fitting surface is formed with θ ₂ <θ ₄ , when crowned, the annular convex corner portion 14a of the rim fitting surface 14 is formed into an annular linear shape on the tapered surface of the rim fitting surface 4 of the container. Make contact.

Most importantly, the central portion of the side of the quadrangle at the abutting portion of the ring-shaped convex corner portion 14a of the rim fitting surface 4 of the bent portion of the rectangular container 1 and the rim fitting surface 14 of the bent portion of the lid 11. With a pushing amount that gradually increases toward
As will be described later with reference to FIGS. 7 to 10, the annular convex corner portion has a barrel shape or the container has a bobbin shape on the rim fitting surface side.

The outer edge fitting surface 13 of the bent portion is formed such that the lower side is an inverse taper having a small diameter or a surface perpendicular to the bottom surface, and the taper angle θ ₃ is the same as or slightly larger than θ _1. At the lower end of the outer edge fitting surface 13, there is provided an inward engaging convex portion 15 that engages with the engaging concave portion 5 of the container 1 in a disengageable manner. The engaging concave portion 5 and the engaging convex portion 15 are usually formed in an annular shape, but not limited to this, and may be formed at equal positions.

Further, when the lid 11 is capped on the container 1, a small tongue piece 17 is formed at a position corresponding to the tongue piece 7 so as to project laterally at a right angle from the lower end of the outer edge fitting surface 13 of the bent portion. Then, a circular convex fitting portion 16 that fits in the approximate center of the position corresponding to the concave fitting portion 6 is formed on the lower side thereof. The tip of the dovetail-shaped cross section of the convex fitting portion 16 is made to have a diameter of, for example, 0.3 to 0.5 mm larger than the width of the dovetail-shaped concave fitting portion 6 of which the bottom opens.

The base of the tongue piece 17 forms a thin portion 18 along the outer periphery of the lid 11 so that it can be easily bent. Further, a tongue piece 10 is formed at a position corresponding to the tongue piece 8 of the container 1 so as to project laterally at a right angle from the tongue end of the bent portion outer edge fitting surface 13, and the tongue piece 10 and the tongue piece 8 of the container 1 are formed. The phases are slightly shifted so that they can be easily pinched. In this embodiment, the lidded container is shown in a quadrangular shape, but may be in a polygonal shape such as a pentagon, a hexagon, or an ellipse. Note that the present invention does not include a circle.

In the enlarged view (FIG. 3) of the hook-shaped cross section of the container 1 and the lid 11 shown in FIGS. 1 and 2, the outer edge fitting surface 3,
13 is a surface perpendicular to the bottom surface. Next, the operation will be described based on FIGS. 1, 2, and 3.

In a preparation room such as a supermarket, the container 1 is filled with a side dish containing a liquid such as broth for one person, the lid 11 is placed on the container, and the tongue piece 7 serves as a hook.
When the concave fitting portion 6 and the convex fitting portion 16 of the tongue piece 7 are pressed and fitted from above and below, and the bent portion 12 of the lid 11 is put on the bent portion 2 of the container 11 and pressed and fitted from above and below, As shown in FIG. 3, the bent portion 12 of the lid 11 and the bent portion 2 of the container 1 are fitted by the reverse taper of the outer edge fitting surface, and at the same time, the engaging convex portion 15 engages with the engaging concave portion to detach the lid. Is blocked.

At this time, the rim fitting surface 1 of the bent portion of the lid 11
Since the diameter D ₁ of the annular convex corner portion 14a at the lower end of 4 is larger than the inner diameter d ₁ of the contact portion of the bent portion rim fitting surface 4 of the container 1, the lower end of the annular portion at the lower end is annular due to the elasticity of the bent portion. The convex corner portion 14a is pressed against the bent portion rim fitting surface 4 of the container 1 and comes into annular contact. And the center of the container opens by the pressure of the juice inside, but the amount of pushing gradually increases toward the center of the side of the quadrangle prevents the decrease of the line contact pressure. can get.

FIG. 4 shows a first modified example of the fitting portion of the hook-shaped cross section of the container 1 and the lid 11, and in the one shown in FIG. 3, the lower end of the outer edge fitting surface 3 of the container is shown. The inward engaging concave portion 5 of the container 11 is removed, and the inward engaging convex portion 15 of the lower end of the outer edge fitting surface of the lid 11 is fitted to the lower end of the vertical surface of the outer edge fitting surface 3 of the container 1. It is what makes me.

In FIG. 5, which shows a realistic shape which is effective in facilitating the production of the molding die and preventing the quality unevenness due to variations in molding in the shape of FIG. By forming the rising corner 4b of the tapered lip fitting surface 4 of the bent portion 2 of the container 1 into a slightly large arc, it is possible to prevent variations during molding of the container. The corners 4a to the ceiling 2a are opened and tapered, and the lower end of the vertical outer edge fitting surface 3 is bent outward to facilitate cutting from the sheet, and the engagement protrusion 15 described later is easily engaged. .

The mold can be easily manufactured by forming the annular convex corner portion 14a at the lower end of the tapered lip fitting surface 14 of the lid 11 into an obtuse angle without forming an acute angle as the reverse taper inclined surface 14b. However, the effect of contacting the circular wire remains the same. Corner 4
Since a and 14b are tapered, the lid 11 can be easily slid into the container 1 when it is fitted. By making the inner corner 14c of the ceiling of the bent portion 12 of the lid a slightly larger arc, it is possible to prevent variations in molding the lid. Further, by bending the end of the engaging convex portion 15 at the lower end of the outer edge fitting surface 13 of the lid outward, the cutting from the sheet can be facilitated.

Further, what is shown in FIG. 6 is a container 1 and a lid 11.
2 is a second modified example of the fitting portion of FIG. 3, which is a collar-shaped cross section in which the outer edge fitting portion is removed from the one shown in FIGS. In order to define the position of the annular line contact portion from the open end of the container 1, the ceilings of the bent portion and the bent portion must be in close contact with each other. 3 and 4, the ceiling does not necessarily have to be in close contact.

Next, description will be given based on FIGS. 7 to 10 and FIG. 3 showing sectional end views of the line contact portion of the annular convex corner which is a feature of the present invention. 3 and 7, the barrel-shaped square lid 1
The outer diameter D ₁ of the diagonal position B ₁ B ₃ ; B ₂ B ₄ of the annular convex corner portion 14a at the lower end of the rim fitting surface 14 of the first bent portion 12 is
From the corresponding diagonal positions A ₁ A ₃ ; A ₂ A ₄ of the line contact portion of the bent edge fitting surface 4 of the container 1 from the inner diameter d ₁ of only 0.1 to 0.5 mm, preferably 0. It is formed with a size larger by 2 mm. This dimension is common to each figure.

Then, each side of the quadrangle of the container 1 A ₁ A ₂ , A
Each of ₂ A ₃ , A ₃ A ₄ , and A ₄ A ₁ is formed by an arc of the same size and having a large curvature R ₁ which is convex outward, and this arc R ₁ is an arc in contact with a small arc R ₀ of a corner portion. Is. Each side of the quadrangle of the lid 11 B ₁ B ₂ , B ₂ B ₃ , B ₃ B ₄ , B
Similarly, ₄ B _{1 is} also formed by an arc having a large curvature R ₂ which is convex outward in the same size, and this arc R ₂ is an arc in contact with the small arc R ₀ at the corner.

The relationship between R ₁ and R ₂ is R ₁ > R ₂ , and the annular convex corner portion 14a of the inner lid gradually increases the pushing amount δ toward the central portion of the side of the quadrangle, and at the central portion. The amount is appropriately determined according to the length of the side of the polygon, but is 0.2 to 1.0 mm. Preferably 0.3-
It is 0.5 mm. For this reason, the line contact pressure in the central portion increases, but the contact pressure is averaged by compensating for the spread of the liquid contained in the container 1 due to the internal pressure and the variation in the contact pressure due to a molding error.

In FIG. 8 shown as a modification of FIG. 7,
Each side of the quadrangle of the container 1 has a small arc R _{0 at} the corner of the line contact portion.
Is formed by a straight line in contact with a small arc R ₀ at a corner of the lid 11 and a large arc R ₃ in contact with a small arc R _0, and the pushing amount of the central part is appropriately determined by the length of the side of the polygon. ．
2 to 1.0 mm, preferably 0.3 to 0.5 mm.

The one shown in FIG. 9 is a lid 1 that enters the inside of the container.
The annular convex corner portion 14a of 1 is a small circular arc R in which each side of the quadrangle is a corner portion.
It is formed by a straight line in contact with ₀ , the container 1 is a bobbin shape, and each side of the quadrangle of the contact portion of the rim fitting surface 4 is an inward large arc R ₄ in contact with the small arc R ₀ of the corner portion, and the inside of the central portion of the side. Similarly, the amount of pushing in is 0.2 to 1.0 mm, preferably 0.3 to 0.
It is 5 mm.

The one shown in FIG. 10 which was without the large arc inward instead 9 that the linear square sides of the lid 11 in the container pincushion square, for large arc R ₆ of the container lid The relation with the large arc R ₅ is R ₆ <R ₅ , and the inward pushing amount of the central portion is 0.2 to 1.0 mm, preferably 0.3.
~ 0.5 mm. The operation of any of the above is the same as that described with reference to FIG. 7.

[0045]

As described above, the present invention has the following effects. When the soup is placed in the container, lateral pressure is applied to increase the flexure of the central portion of the side of the quadrangle and reduce the contact pressure. Alternatively, since the amount of pushing into the central portion is gradually increased with respect to the formation of the gap, it is possible to prevent the contact pressure from being averaged without lowering and impairing the hermeticity. This effect becomes more remarkable as the container becomes larger.
Moreover, the pressure is averaged by compensating for the non-uniformity of the line contact pressure due to variations in the production of containers and lids, and the product is more reliably sealed and its quality is more stable.

[Brief description of drawings]

FIG. 1 is a diagram of a rectangular container of a container with a sealed lid according to an embodiment of the present invention, (a) is a front view and (b) is a side sectional view.

2A and 2B are views of a rectangular lid of a container with a sealed lid according to an embodiment of the present invention, in which FIG. 2A is a front view and FIG. 2B is a side sectional view.

FIG. 3 is an enlarged cross-sectional view of a fitting portion between the container and the lid of the container with a sealed lid according to the embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a fitting portion according to another embodiment.

5 is an enlarged cross-sectional view of a fitting portion showing a practical type with respect to the basic type of FIG.

FIG. 6 is an enlarged cross-sectional view of a fitting portion according to another embodiment.

FIG. 7 is a contact line diagram of a line contact portion between the container and the lid, showing the extruded amount at the center of the side in an exaggerated manner. (A) shows the container overlaid with the lid in phantom line (b) shows It is a lid.

FIG. 8 is another contact line diagram of the line contact portion between the container and the lid, showing the extruded amount at the center of the side in an exaggerated manner, (a) showing the container with the lid overlaid by phantom lines, and (b) showing It is a lid.

FIG. 9 is another contact line diagram of the line contact portion between the container and the lid, showing the extruded amount at the center of the side in an exaggerated manner, (a) showing the container over the lid in phantom lines, and (b) showing It is a lid.

FIG. 10 is another sectional end view of the line contact portion between the container and the lid,
It is the figure which exaggerated the amount of extrusion of the center part of a side, (a) shows a lid to a container with an imaginary line, (b) is a lid.

FIG. 11 is a fitting cross-sectional view of a conventional container with a lid.

12 is an enlarged cross-sectional view of the fitting portion of FIG.

FIG. 13 is an enlarged cross-sectional view of a fitting portion of another example of a conventional lidded container.

Claims (9)

[Claims] 1. A container with a lid, in which an annular bent portion of a resin or paper-made polygonal lid is crowned on an annular bent portion of a hook-shaped cross section outward from the mouth line of the resin-made or paper-made polygonal container. There is formed an engaging concave portion and an engaging convex portion that engage with each other at the lower end of the outer edge fitting surface of each of the annular bent portion and the annular bent portion, and the edge fitting surface of the annular bent portion. The mouth is narrowed to form an arbitrary taper, and the edge fitting surface of the annular bent portion that is capped on the mating surface of this taper is formed with a narrower mouth and a taper with a larger angle than the taper Is formed in an annular convex corner that makes an annular linear contact when mating,
A container with a closed lid, characterized in that an edge fitting surface is formed so that the amount of pushing gradually increases toward the center of the polygonal side at the annular linear contact portion. 2. The container with a closed lid according to claim 1, wherein the container and the lid are oval instead of polygonal. 3. The container according to claim 1 or 2, wherein the engaging concave portion at the lower end of the outer edge fitting surface of the container is removed and the engaging convex portion at the lower end of the outer edge fitting surface of the lid is engaged with the lower end. A container with a closed lid. 4. The container with a closed lid according to claim 1, wherein the outer edge fitting surfaces of the container and the lid are removed. 5. The polygonal side of the linear contact portion of the lip fitting surface of the container is an outwardly convex arc, and the outward convex arc of the polygonal side of the linear contact portion of the lip fitting surface of the lid is The container with a sealed lid according to claim 1, which has a curvature smaller than that of the convex arc. 6. The polygonal side of the linear contact portion of the lip fitting surface of the container is a straight line, and the polygonal side of the linear contact portion of the lid fitting surface of the lid is an outwardly convex arc. Any one of items 1, 3 and 4
The container with a closed lid according to item. 7. The polygonal side of the linear contact portion of the lip fitting surface of the container is an inwardly convex arc, and the polygonal side of the linear contact portion of the lid fitting surface of the lid is a straight line. Any one of items 1, 3 and 4
The container with a closed lid according to item. 8. The polygonal side of the linear contact portion of the lip fitting surface of the container is an inwardly convex arc, and the polygonal side of the linear contact portion of the lip fitting surface of the lid is an inwardly convex arc. The container with a sealed lid according to claim 1, wherein the container has a curvature larger than that of the inwardly convex arc. 9. A container with a lid for fitting a resin or paper lid whose fitting portion has a similar shape to the inside of a non-circular container made of resin or paper, which is inserted from the mouth of the container. At the position, both are formed in a shape that makes an annular linear contact fit, and the container and the lid are formed to a size that compensates for the decrease in the contact pressure toward the center between the corners of the fitting part. A container with an airtight lid characterized by: