JPH101156A - Packaging container and its cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container with an excellent airtightness. SOLUTION: A packaging container includes a container main body 12, a cap 16 to be put on a neck 14 of the container main body 12 and a seal plate 26 made of a flexible material and arranged on the inner face of a top panel 20 of the cap 16. An annular protruding rim 28 is extended inward from the upper end of the mouth 14 and then upward to form an inner edge 30. An annular protrusion 38 with a diameter larger than the inside diameter of the protruding rim 28 is provided on the inner face of the top panel 20 of the cap 16. The protruding rim 28 is formed to hold the seal plate 26 between the inner edge 30 of the protruding rim 28 and the top panel 20 of the cap 16 when the cap 16 is screwed on the neck 14, and has an annular holding face 36 to hold the seal plate 26 between the protrusion 38 and the holding face 36 when the cap 16 is screwed on the neck 14. By this constitution, there are two seal parts, resulting in a remarkable improvement of airtightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container containing an edible dough or the like, and more particularly to a means for securely closing the mouth and neck of a container body.

[0002]

2. Description of the Related Art As a technique for sealing the mouth and neck of a container body in a packaging container, a protruding edge projecting inward and upward is formed at the upper end of the mouth and neck of a synthetic resin container body. There is one in which the end is elastically contacted with the inner surface of the top plate portion of the lid (see Japanese Utility Model Application Laid-Open No. 63-144458).

[0003]

However, in the above-described conventional structure, even in the case of a wide-mouthed container, even if the protrusion is slightly deformed, sealing leakage may occur. Further, sealing leakage due to deformation of the protruding edge portion may occur due to an increase in pressure of carbon dioxide gas or the like generated depending on the type of the edible dough product.

[0004] Therefore, an object of the present invention is to provide a packaging container excellent in hermeticity.

[0005]

In order to achieve the above object, the present invention provides a container body having a mouth and neck, a lid screwed to the mouth and neck of the container body, and a top plate of the lid. A sealing plate made of a soft material disposed on the inner surface of the portion, wherein an annular protruding edge portion is provided at an upper end of the mouth and neck portion and extends inward while the inner end extends upward. On the inner surface of the top plate, an annular protrusion having a diameter larger than the inner diameter of the protrusion is provided, and when the lid is attached to the mouth and neck, the inner end of the protrusion and the top plate of the cover A protruding edge portion is formed so that the seal plate is sandwiched between the protruding portions, and an annular clamping surface for clamping the seal plate between the protruding portion and the protruding portion when the lid is screwed to the mouth and neck portion is formed on the protruding edge portion. , Is characterized. In particular, when the lid is attached to the mouth and neck of the container body by screwing or tapping, in such a configuration, sealing is sufficiently performed at two places, so that the sealing performance is significantly improved.

Further, when the container body and the lid are made of synthetic resin, the sealing plate is pressed with an elastic force, so that the sealing performance is maintained even if the attachment of the lid by screwing is slightly loosened.
Further, when the lid is attached by tapping, the lid does not loosen, so that a higher hermeticity is maintained. In order to exhibit these effects, the synthetic resin must conform to JIS-K720.
Flexural modulus according to No. 3 is 8000 kgf / cm ^{2 to} 150
Preferably, it is 00 kgf / cm ² .

[0007] It is preferable that the protruding edge has at least two step surfaces that are located upward as it goes inward, and that the holding surface is an annular rising surface formed between the step surfaces.

Further, in the cross section along the central axis of the mouth and neck, the point of connection (P1) between the projection and the mouth and neck and the point on the inner end of the projection are provided. The angle formed by the line connecting the point (P2) that first comes into contact with the seal plate when screwed into the neck and the plane passing through the connection point (P1) at right angles to the central axis is 18
When the angle is between 50 degrees and 50 degrees, the protruding edge can contact the seal plate with an appropriate elastic force.

The soft material constituting the sealing plate is preferably a foamed plastic, and its apparent density is 0.01 g / cm ^3.
It is good to be 0.30 g / cm ³ .

[0010] When an edible dough product that generates carbon dioxide gas or the like is used as the contents of the packaging container, the top plate of the lid attached to the container main body has a pressure detecting member whose shape changes according to the internal pressure of the container main body. It is preferred to form a part. This makes it possible to visually detect the internal pressure of the packaging container.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. Note that in this specification, terms such as "up" and "down" are based on the upper and lower sides shown in the drawings.

[0012]

First Embodiment FIGS. 1 and 2 are sectional views showing an embodiment of a packaging container constructed according to the present invention.
The illustrated packaging container 10 includes a container body 12 made of a synthetic resin.
And a lid 16 made of a synthetic resin for closing the mouth and neck 14 of the container body 12. Edible dough products,
Contains semi-fluids and fluids such as grease and other machine oils, hand creams, cosmetic emulsions, kneading detergents, glue wax for pruning cuts on planting trees, wood glue used for pasting shoji paper, etc. It is a good thing to do.

The container body 12 is a substantially cylindrical bottomed container, and a substantially cylindrical mouth and neck portion 14 is integrally formed on an upper portion thereof. A screw ridge is formed on the outer peripheral surface of the mouth and neck portion 14 to constitute a male screw portion 18.

The lid 16 includes a disk-shaped top plate portion 20 and a substantially cylindrical side wall portion 22 hanging down from the periphery of the top plate portion 20. A screw ridge is formed on the inner peripheral surface of the side wall portion 22, and forms a female screw portion 24 that can be screwed with the external thread portion 18 of the container body 12.

The synthetic resin for forming the lid 16 and the container body 12 includes low-density polyethylene, medium-density polyethylene, high-density polyethylene, and α-olefin having 4 to 4 carbon atoms.
8, ethylene / α-olefin copolymer, polypropylene, ethylene / propylene copolymer, ethylene / vinyl acetate copolymer, ethylene / (meth) acrylate copolymer, ethylene / alkyl (meth) acrylate copolymer Preferred are coalesce, 4-methylpentene-1 polymer, aliphatic polyamide, aromatic polyamide, and ester copolymer. More preferred synthetic resins are high-density polyethylene, medium-density polyethylene, ethylene / butene-1 copolymer, ethylene / hexene-1 copolymer, ethylene / 4-methylpentene-1 copolymer, and ethylene / octene-1 copolymer. It is a polymer.

The inner surface of the top plate 20 of the lid 16 (FIGS. 1 and 2)
In the lower surface), the diameter is almost the same as the diameter of the top plate portion 20,
If necessary, a disk-shaped seal plate 26 having a diameter of about 90% of the diameter is fitted and attached. If necessary, in the case of a disc-shaped sealing plate 26 having a diameter smaller than or about 90% of the diameter of the top plate portion 20, in order to prevent the sealing material 26 from falling off, the side wall portion 22 is formed.
An annular projection or a spaced apart annular projection can be provided along the inner peripheral wall of the. The sealing plate 26 is made of a soft material, preferably a foamed plastic or an elastomer resin, and is more preferably formed by stamping a single-layer or laminated foamed plastic plate. The cell structure of the foamed plastic may be either a closed cell structure or an open cell structure, but the apparent density is 0.01 g / cm ^{3 to} 0.30 g.
/ Cm ³ is preferable. When a seal plate 26 containing open cells is used, it is preferable to re-melt one or both surfaces of the seal plate 26 with a heating roller in order to eliminate through holes penetrating both surfaces of the seal plate 26.
As the elastomer resin, a thermoplastic elastomer is preferable. Among them, if it is an olefin-based resin, an ethylene / propylene copolymer, an ethylene / vinyl acetate copolymer, an ethylene / (meth) acrylic acid copolymer, an ethylene / (meth) ) A metal salt partially neutralized product of an acrylic acid copolymer, or an ethylene / (meth) acrylic acid alkyl ester copolymer, or styrene / butadiene /
Isoprene copolymer, styrene-ethylene-butadiene block copolymer (SEBS), vinyl chloride-based vinyl chloride-acrylonitrile-butadiene copolymer, and urethane-based thermoplastic polyurethane (TP
U), if it is an ester type, it is preferable to use polyester or polyether / ester; if it is an amide type, it is preferable to use polyether / ester / amide;
Particularly, ethylene / propylene copolymer, styrene / butadiene / isoprene copolymer, SEBS and TPU are preferable. In addition, these thermoplastic elastomers, if necessary, pigments for coloring, heat stabilizers or processing aids to improve processability, slip agents or anti-blocking agents to improve surface properties or Organic or inorganic fillers can be added as appropriate.

The packaging container 10 according to the present embodiment is further formed integrally with the mouth and neck 14 and
Is provided with an annular protruding edge portion 28 extending inward from the upper end of the tongue. The protruding edge portion 28 has a central axis A of the mouth and neck portion 14 as a whole.
, And its inner end 30 extends upward substantially in parallel with the central axis A. Also,
The protruding edge portion 28 has at least two step surfaces 32 and 34 formed so as to be higher toward the center. These step surfaces 32 and 34 are gradually inclined upward toward the central axis A, and a steep rising surface 36 is formed between both step surfaces 32 and 34. When the lid 16 is screwed onto the mouth and neck portion 14 of the container body 12, the inner end 30 of the protruding edge portion 28 elastically contacts the lower surface of the seal plate 26 as shown in FIG. It is sandwiched between the lower surface of the top plate portion 16 and a desired sealing effect.

An annular projection 38 is formed on the lower surface of the top plate portion 20 of the lid 16 coaxially with the female screw portion 24.
The protrusion 38 has an inner surface 40 extending substantially perpendicular to the lower surface of the top plate 20 and an inclined outer surface 42. The inner diameter of the inner surface 40 of the protrusion 38 is substantially the same as or slightly larger than the inner diameter of the rising surface 36 of the protrusion 28 of the container body 12 (the distance from the central axis A to the point a in FIG. 1). It has been. When the lid 16 is screwed onto the mouth-and-neck portion 14 of the container body 12, as shown in FIG. 2, the protruding portion 38 forms a seal plate 26 between the rising surface (clamping surface) 36 of the protruding edge 28. Therefore, the position of the protruding portion 38 depends on the bent state of the protruding portion 28 when the cover 16 is screwed, and the rising surface 3 of the protruding portion 28.
6 is appropriately selected according to the position of the sealing plate 26, the thickness of the sealing plate 26, and the like.

As described above, in the packaging container 10 of the present embodiment, the lid 16 is screwed onto the mouth-and-neck portion 14 of the container body 12 and the inner end 30 of the protruding edge 28 and the top of the lid 16 are screwed. The sealing plate 26 is sandwiched between the plate portion 20 and the two portions between the rising surface 36 of the protruding edge portion 28 and the protruding portion 38 of the lid 16, so that a very high sealing effect can be obtained. Also, lid 1
6 and the container body 12 are made of a synthetic resin having an appropriate elastic modulus, the protruding edge portion 28 is elastically bent, so that even if the lid 16 is slightly loosened, the protruding edge portion with respect to the seal plate 26 is formed. The pressing force of 28 is maintained, and the sealing effect is not lost. Therefore, when the content is an edible kneaded product, rot, discoloration, or odor can be suppressed. Further, when the content is grease, it is possible to suppress a change in viscosity and an unpleasant odor due to oxidation. Furthermore, when the content is a hand cream or a cosmetic emulsion, the separation of oils and fats or the unpleasant odor can be suppressed. A change in viscosity or discoloration due to evaporation can be suppressed.

In consideration of the fact that the cover 16 is generally removed manually, the cover 16 is screwed in place.
The torque applied to the tire is 30 kgf · cm to 80 kgf
· Cm, more preferably 50 kg
f · cm to 60 kgf · cm. If necessary, the air in the head space of the container body 12 containing the contents may be replaced with carbon dioxide gas or nitrogen gas.

In order to sufficiently exhibit the above-mentioned sealing effect, the synthetic resin constituting the lid 16 and the container body 12 is made of JI
Flexural modulus according to SK7203 is 8000kgf / c
It is effective that m ^{2 to} 15000 kgf / cm ² .

Further, in the cross section along the central axis A of the mouth and neck portion 14, the connecting point P between the protruding edge portion 28 and the mouth and neck portion 14
1, that is, the point of inflection of the protruding portion 28 and the point P2 on the inner end 30 of the protruding portion 28 that first comes into contact with the seal plate 26 when the lid 16 is screwed onto the mouth and neck portion 14. A line segment P connecting
If the angle between 1-P2 and the plane S passing through the joining point (P1) at right angles to the central axis A is θ, the value of θ is the circumferential angle 3
When the angle is 18 degrees to 50 degrees in the 60 degree display, the protruding edge portion 28 can come into contact with the seal plate 26 with an appropriate elastic force.

Further, the torque applied to the lid 16 at the time of screwing is 3
When the thickness is 0 kgf · cm to 80 kgf · cm, the thickness of the seal plate 26 is preferably 0.5 mm to 4.0 mm. If the thickness of the seal plate 26 is larger than 4.0 mm, the screwing torque must be increased,
There is a possibility that the container body 12 is deformed and the airtightness is impaired. Conversely, when the container body 12 is smaller than 0.5 mm, it is necessary to increase the dimensional accuracy of the projection 38 of the lid 16 and the projection 28 of the container body 12.

Although the preferred embodiment of the present invention has been described in detail, it goes without saying that the present invention is not limited to the above embodiment. For example, in the above embodiment,
Although the seal plate 26 is a flat plate, the outer periphery of the seal plate 26 is deformed downward when the cover plate 16 is fitted into the cover 16 and the cover 16 is further tightened.
In order to reduce the deformation of the outer peripheral portion of 6, the shape of the seal plate 26 may be spherical, or the outer peripheral portion may be a truncated cylindrical shape. Further, an annular projection (not shown) that hangs downward from the outer peripheral edge of the seal plate 26 may be provided, and the outer peripheral surface of the upper end portion of the mouth and neck portion 14 may be sealed by the projection.

[0025]

Second Embodiment FIGS. 3 and 4 are sectional views of another embodiment of the packaging container according to the present invention. In addition,
The same elements as those in the first embodiment are denoted by the same reference numerals.

In the present embodiment, the mouth and neck 1 of the container body 12
Unlike the first embodiment in which the lid 16 is screwed to the container 4, the lid 16 is stoppered to the mouth and neck of the container body 12. More specifically, an annular convex portion 1 is formed on the outer peripheral surface of a substantially cylindrical mouth and neck portion 14 integrally formed on the upper portion of the container body 12.
An annular concave portion 25 is formed on the inner peripheral surface of the side wall portion 22 constituting the lid 16 so that the annular concave portion 25 can be fitted with the annular convex portion 19 of the container body 12 when the stopper is plugged.

In this embodiment, even when the lid 16 is plugged into the mouth and neck 14 of the container body 12, the same sealing effect as in the first embodiment can be obtained. That is, the protruding edge portion 28 of the mouth and neck portion 14
As shown in FIG. 4, the inner end 30 elastically contacts the lower surface of the seal plate 26, and the seal plate 26 is sandwiched between the lower surface of the top plate portion 20 of the lid 16 to obtain a desired sealing effect. Like that.

When the annular projection 38 on the lower surface of the top plate portion 20 of the lid 16 pierces the lid 16 to the mouth and neck portion 14, as shown in FIG. Clamping surface) 36
And the sealing plate 26 is sandwiched between them to obtain a sealing effect.

As described above, in the packaging container 10 of the present embodiment, similarly to the case of screwing, the inner end 30 of the protruding edge 28 and the lid 1
6, the sealing plate 26 is sandwiched between the rising surface 36 of the protruding edge 28, the lid 16 and the protruding portion 38, and a very high sealing effect is obtained. .

Further, in the packaging container 10, the lid 16
Is attached to the mouth and neck portion 14 of the container body 12 in a state where it is plugged, so that it does not loosen. Therefore, the sealing plate 2
The pressing force of the lip 28 against the rim 6 is maintained and a high degree of sealing effect is constantly maintained. In particular, this sealing effect becomes more remarkable when the lid 16 and the container body 12 are made of the above-mentioned synthetic resin having an appropriate elastic modulus, because the protruding edge portion 28 is elastically bent.

As described above, the container body 12 and the lid 16
Had a substantially cylindrical shape. However, when the lid 16 is attached to the container body 12 by stoppering,
Unlike the case of screwing, the circumferential position of the lid 16 with respect to the container body 12 is arbitrarily determined while maintaining a constant sealing effect. Therefore, even when the horizontal cross-sectional shapes of the outer peripheral surfaces of the container body 12 and the lid 16 are, for example, elliptical, in the case of stoppering, positioning at the time of attachment becomes easy. Note that FIG.
As shown in FIG. 3 and FIG. 3, the annular convex portion 19 and the annular concave portion 25 are not formed continuously in the circumferential direction, but are arranged at regular intervals in the circumferential direction.
Even if the position of the lid 16 with respect to the container body 12 is uniquely or appropriately determined, the same operation and effect can be obtained.

[0032]

[Third Embodiment] When the edible dough described in the first embodiment is contained as a content in a container body, a gas such as carbon dioxide gas may be released depending on the type. For example, it is common to heat-treat the yeast contained in the miso so that the miso contained therein is distributed at room temperature. However, in recent years, miso that is not heat-treated and has a specialty of so-called raw miso has been distributed. In this raw miso, carbon dioxide is generated by its metabolism, and the inside of the packaging container 10 is filled with a positive pressure, so that the packaging container 10 receives a large load. Therefore, in the packaging container 10 of the present embodiment, by providing the top plate portion 20 of the lid 16 with the pressure detection unit 44 in which the shape of the packaging container 10 changes according to the internal pressure, The internal state of the container 10 can be detected.

Referring to FIG. 5 in detail, a pressure detecting section 44 is provided at the center of the top plate section 20 of the lid 16 so as to be curved toward the container body 12. Preferably, the pressure detecting portion 44 is formed inside the inner end 30 of the projecting edge portion 28 of the container main body, and a sealing effect is obtained at the two sealing portions described above. The shape of the pressure detector 44 is such that the center is the center axis A of the packaging container 10.
And the thickness thereof becomes thinner toward the center of the pressure detecting portion 44. Thereby, the pressure detecting section 44 is easily subjected to a change in shape according to the internal pressure of the packaging container 10, and when a certain pressure is reached, the pressure detecting section 44 reverses to a state of being curved upward. It becomes deformed. Therefore, the internal pressure of the packaging container 10 can be visually confirmed. In order for such deformation to be reversible, it is preferable that the lid 16 constituting the top plate portion 20 is made of a synthetic resin having appropriate elasticity as described above. Therefore, in this case, the temporal change of the internal pressure of the packaging container 10 can be visually confirmed.

The present embodiment is not limited to the pressure detecting section 44 having the shape shown in FIG. 5, but may be a pressure detecting section 44 having the shape shown in FIGS. That is, unlike the pressure detecting unit 44 of FIG. 5 which is formed as a part of the spherical surface, the central part and the peripheral part of the pressure detecting unit 44 are made flat and part of the spherical surface, respectively (see FIG. 6), or the spherical surface is formed. Or a part of an inverted conical shape (see FIG. 7), or a part of a curved spherical surface that is convex upward and convex downward (see FIG. 8). Further, in order to visually detect a state in which the internal pressure is different, the pressure detectors 4 having different thicknesses are provided.
A plurality of 4 may be provided. For example, as shown in FIG. 9, around the pressure detecting unit 44 shown in FIG. 5, pressure detecting units 44 a to 44 having different thicknesses from the pressure detecting unit 44.
c may be further provided at equal intervals in the circumferential direction, and the internal pressure of the packaging container 10 may be detected stepwise.

The foods generating carbon dioxide gas and the like are limited to raw miso in the present embodiment. In addition, there are yam, unheated garlic and natural cheese, roasted coffee beans, and the like. .

Next, the results of a trial production of a packaging container 10 according to the present invention and a shelf life test assuming a practical state are shown below. In this shelf life test, discoloration and odor on the headspace side surface of the contents were stored for 30 days at 15 ° C. after refrigeration and storage, based on the contents filled in a glass sealed container in which the air in the headspace was replaced with nitrogen gas. The comparison was made between the visual and olfactory senses of healthy people. Then, based on the presence / absence of discoloration from the reference hue, classification is performed with or without discoloration.
Based on the presence or absence of a difference in odor, the odor was classified as having or not having a change.

[0037]

Embodiment 1 The shape of the packaging container of Example 1 is basically the same as the shape of the packaging container 10 shown in FIGS. 1 and 2 or FIGS. 3 and 4. The shapes of the following Examples 2 and 3 are basically the same as those shown in FIGS. 1 and 2 or FIGS. 3 and 4.

The container body and lid of this packaging container are made of JI
Flexural modulus by S-K7203 is 13000 kgf /
cm ² , density according to JIS-K6760 is 0.954 g
/ Cm ³ and a melt flow rate of 0.25
g / 10 min.

In the case of the container body and the lid attached by screwing, the outer diameter of the container body is about 97 mm, the outer diameter of the external thread portion of the mouth and neck is about 78 mm, the valley diameter is about 75.6 mm, and the protruding edge portion Had an inner diameter of about 67.5 mm. The outer diameter of the lid was about 81 mm. Further, a step surface 32 and a step surface 34, which are two step surfaces that are located higher inside the protruding edge portion 28, are provided, and an angle between a line segment P1-P2 connecting the points P1 and P2 and the surface S is formed. was set to 24 degrees, and the height of the protrusion was about 1 mm. As the sealing plate, foamed low-density polyethylene having a closed cell structure, an apparent density of 0.26 g / cm ³ , and a thickness of 3 mm was used. In FIG. 1, the cross-sectional length of the step surface 32 on the container body 12 side is 1.0 mm, and the cross-sectional length of the second step surface 34 is 0.5 mm.

In the case of the container body and the lid attached by tapping, the outer diameter of the mouth and neck is about 78 mm, and the inner diameter of the protruding edge is about 67.5 mm. And

The packaging container containing 500 g is filled with 90% by weight of the ground pepper, sealed under the above conditions, and stored refrigerated at 15 ° C. for 30 days. The surface was judged to have no discoloration and no change in odor.

[0042]

Embodiment 2 In the packaging container of Embodiment 2, the angle θ between the line segment P1-P2 and the surface S was 45 degrees with respect to the shape of the protruding edge, and SEBS having a thickness of 2 mm was used as a sealing plate. Except for this point, it was substantially the same as that of Example 1.

Such a packaging container containing 500 g was filled with 90% by weight of the kneaded pepper, sealed under the above conditions, and stored refrigerated at 15 ° C. for 30 days. The surface was judged to have no discoloration and no change in odor.

[0044]

Embodiment 3 In the packaging container of Embodiment 3, the angle θ between the line segment P1-P2 and the surface S is set to 18 degrees, the thickness of the sealing plate is 3 mm, and the apparent density is 0. 32g
/ Cm ³ , except that foamed low-density polyethylene was used.

Into such a packaging container containing 500 g, 90% by weight of miso was filled and sealed under the above conditions.
As a result of refrigerated storage at 15 ° C. for 30 days, it was determined that the headspace side surface of the filled miso had no discoloration and no change in odor.

[0046]

Example 4 In the packaging container of Example 3, a low-density polyethylene in a foamed state having a thickness of 1 mm and an apparent density of 0.26 g / cm ³ was used as a sealing plate, and its shape was a flat plate having an annular projection on the periphery. It was substantially the same as that of the example 1 except that the shape was changed.

The packaging container containing 500 g is filled with 90% by weight of the ground pepper, sealed under the above conditions, and refrigerated at 15 ° C. for 30 days. As a result, the head space side of the filled ground pepper is obtained. The surface was judged to have no discoloration and no change in odor.

[0048]

Fifth Embodiment A fifth embodiment is different from the first embodiment except that a pressure detection unit 44 as shown in FIG.
A packaging container substantially the same as the packaging container 10 described in (1) was used.

The packaging container was filled with 90% by weight of kneaded garlic without heat treatment (kneaded garlic that continuously generates carbon dioxide gas), sealed, and stored at 15 ° C. for 30 days. As a result, due to the carbon dioxide gas generated from the kneaded garlic, the internal pressure of the packaging container is increased, and the pressure detection unit provided on the top plate of the lid is inverted, but the sealing property of the packaging container is maintained, The surface on the head space side was discolored, and it was judged that there was no change in odor.

[0050]

As described above, in the packaging container according to the present invention, when the lid is screwed or stoppered on the mouth and neck of the container body, two annular seal portions are formed between the mouth and neck and the lid. Formed between them. As a result, the sealing effect is significantly improved, and the contents can be stored for a long time.

In order to visually detect the internal pressure of the packaging container, a pressure detecting portion that changes the shape of the packaging container according to the internal pressure is provided on the top plate of the lid.
Thus, in the case of an edible dough product that generates carbon dioxide gas or the like as the contents of the packaging container, the internal state can be visually determined without opening the package.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a packaging container according to the present invention, showing a state where a lid and a container body are separated.

FIG. 2 is a partial cross-sectional side view showing a state where a lid is screwed onto a mouth and neck of a container body in the packaging container of FIG. 1;

FIG. 3 is a cross-sectional view showing a second embodiment of the packaging container according to the present invention, showing a state where a lid and a container body are separated.

FIG. 4 is a partial cross-sectional side view showing a state in which the lid is plugged into the mouth and neck of the container body in the packaging container of FIG. 3;

FIG. 5 is a partial cross-sectional side view showing a third embodiment of the packaging container according to the present invention, showing a state where a lid is screwed onto a mouth and neck of a container body.

FIG. 6 is a partial cross-sectional side view showing a lid of a third embodiment of the packaging container according to the present invention, showing a first modified example thereof.

FIG. 7 is a partial cross-sectional side view showing a lid of a third embodiment of a packaging container according to the present invention, showing a second modified example thereof.

FIG. 8 is a partial cross-sectional side view showing a lid of a third embodiment of the packaging container according to the present invention, showing a third modified example thereof.

FIG. 9 is a top view of a lid of a packaging container according to a fourth modification of the third embodiment of the present invention.

[Explanation of symbols]

10: packaging container, 12: container body, 14: mouth and neck, 1
6 ... lid, 18 ... male thread, 19 ... annular convex part, 20 ... top plate part, 22 ... side wall part, 24 ... female thread part, 25 ... annular concave part,
26 ... seal plate, 28 ... protruding edge, 30 ... inner end, 32,
34: stepped surface, 36: rising surface (holding surface), 38: projection, 40: inner surface, 42: outer surface, 44, 44a, b,
c: Pressure detector.

Claims (15)

[Claims] 1. A container body having a mouth-neck portion, a lid attached to the mouth-neck portion of the container body, and a seal plate made of a soft material disposed on an inner surface of a top plate portion of the lid. In the packaging container, at the upper end of the mouth and neck portion, an annular protruding portion is provided which extends inward and an inner end thereof extends upward, and an inner surface of the top plate portion of the lid has an inner diameter of the protruding portion. An annular protrusion having a larger diameter than the seal plate is sandwiched between the inner end of the protrusion and the top plate of the lid when the lid is attached to the mouth and neck. Forming the protruding edge portion, and forming an annular holding surface for holding the seal plate between the protruding portion and the protruding portion when the lid is attached to the mouth and neck portion. A packaging container, characterized in that: 2. The container according to claim 1, wherein the lid is screwed onto the mouth and neck of the container body.
4. The packaging container according to 1. 3. The container according to claim 1, wherein the lid is attached to the mouth and neck of the container body by tapping.
4. The packaging container according to 1. 4. The packaging container according to claim 1, wherein the container body is made of a synthetic resin. 5. The container body has a flexural modulus according to JIS-K7203 of 8000 kgf / cm ^{2 to} 15000.
Packaging container according to claim 4, characterized in that the kgf / cm ^2. 6. The packaging container according to claim 1, wherein the lid is made of a synthetic resin. 7. The lid has a flexural modulus according to JIS-K7203 of 8000 kgf / cm ^{2 to} 15000 kgf.
/ Cm ^2. The packaging container according to claim 6, wherein 8. The device according to claim 1, wherein the protruding edge has at least two step surfaces which are located upward as it goes inward, and wherein the holding surface is an annular rising surface formed between the step surfaces. Item 8. The packaging container according to any one of Items 1 to 7. 9. A connecting point (P1) between the protruding edge and the mouth and neck in a cross section along the central axis of the mouth and neck.
And a point on the inner end of the protruding edge portion and a point (P2) that first comes into contact with the seal plate when the lid is attached to the mouth and neck, is the central axis line. The angle between the plane and the plane passing through the junction point (P1) at a right angle to
The packaging container according to any one of claims 1 to 8, wherein the degree is a degree. 10. The packaging container according to claim 1, wherein the soft material is a foamed plastic. 11. The packaging container according to claim 10, wherein the apparent density of the foamed plastic is 0.01 g / cm ³ to 0.30 g / cm ³ . 12. A pressure detecting part whose shape changes according to the internal pressure of the container main body is formed on the top plate part of the lid attached to the container main body. 12. The packaging container according to any one of items 11 to 11. 13. A lid attached to the mouth and neck of the container main body, wherein the top plate has a pressure detecting portion whose shape changes according to the internal pressure of the attached container main body. A lid for a packaging container, comprising: 14. The container according to claim 1, wherein the lid is attached to the mouth and neck of the container body by screwing, and a center of the pressure detecting portion forms a part of a spherical surface passing through a center axis A of the packaging container. The lid of the packaging container according to claim 13, wherein: 15. The container according to claim 1, wherein the lid is attached to the mouth and neck portion of the container body by a stopper, and a center of the pressure detecting portion forms a part of a spherical surface passing through a central axis A of the packaging container. The lid of the packaging container according to claim 13, wherein: