JPH1072056A - Deformation preventive container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a container main body from being deformed and broken especially due to a pressure reduction by a cooling after a hot filling of a content, and a pressure reduction with time by a deoxidizer, concerning a hard plastic container having a cap. SOLUTION: In an opening (1d) of a container main body, a packing 2 which is formed of a material of a low elastic modulus (modulus of rigidity) such as an elastomer, is fitted, and in addition, the opening is tightened by a cap 3. The introduction of the outside air to a space B between the packing 2 and the cap 3 is made available through the screwed part between the cap 3 and the container main body, and a groove 3c which is formed on the cap 3. When the pressure in an upper space (head space) A of the container main body is reduced by a cooling after a hot filling, the packing 2 warps and deforms to the inside of the container, and the capacity of the upper space A is reduced, and the pressure reduction in the upper space A is loosened, and the container is prevented from deforming. Also, when oxygen in the upper space A is gradually consumed by using a deoxidizeer 4, the container is prevented from deforming as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard plastic container having a cap, and more particularly to a container having a container body which is depressurized by cooling after the contents are hot-filled, and further depressurized with time by an oxygen scavenger. The present invention relates to a deformation preventing container capable of preventing deformation and further damage.

[0002]

2. Description of the Related Art As shown in FIG. 1, a wide-mouthed blown container having a relatively wide opening, such as a hard container formed mainly of high-density polyethylene (HDPE) or polyethylene terephthalate (PET). In the case where processed foods, seasonings, beverages, and the like are filled as contents in a hard container formed as a main component, the contents are hot-filled (Hot Fill). Then, a cap is attached to the opening of the container to seal the inside, and in the case of the wide-mouth blow container shown in FIG. 1, the cap is attached after the opening is covered with packing.

[0003]

In this type of rigid container, the upper space (head space) of the container body is depressurized (Partial Vacuum) by cooling after the contents are hot-filled.
um), and the volume in the upper space shrinks. During this contraction, the wall surface of the container body is deformed inward, and in some cases, the wall surface of the container may be damaged. In the wide-mouth blow container shown in FIG. 1, the opening of the container body is covered with a plate-like packing, and a screw-type cap is mounted thereon. As a conventional packing, a rigid plate-like material having a relatively high elastic modulus, such as low-expansion polyethylene having an expansion ratio of about 1.5, is used.
Since the conventional packing has a relatively high rigidity, when the upper space of the container is in a depressurized state, the wall surface of the container is first turned inward before the packing is deformed into the container body. A phenomenon of deformation occurs.

Further, as a packing used for a wide-mouth blow container, there is a packing in which a bag body containing an oxygen scavenger is attached to a surface facing the inside of the container body. In such containers,
The cooling after hot filling not only reduces the pressure in the upper space due to the pressure reduction, but also causes the oxygen in the upper space to be absorbed and consumed by the deoxidizer after the cooling, and the pressure in the upper space is gradually reduced over time. Due to the pressure reduction by cooling after the hot filling and the subsequent time-dependent pressure reduction by the oxygen scavenger, there is a problem that the deformation strength of the container is exceeded and the container wall surface is deformed inward.

[0005] As a measure for preventing the collapse of the wall surface of the container body due to the above-described decompression, in a PET bottle or the like, horizontal ribs are provided on the wall surface of the container or the bottom of the container is tapered to increase the rigidity of the container itself. Some have been enhanced. Alternatively, attempts have been made to provide reduced panels on the body of the container that can be deformed when depressurized.
However, in a container provided with horizontal ribs and the panel, since these pressure reduction measures appear as an external appearance of the container, for example, as shown in FIG. is not.

The present invention has been made to solve the above-mentioned conventional problems, and by improving the material of the plate-like packing and, if necessary, by improving the structure of the cap, it is possible to reduce the pressure by cooling after hot filling and further reduce the pressure. An object of the present invention is to provide a deformation preventing container capable of preventing deformation of a container wall surface due to a temporal decompression by an oxygen scavenger.

Further, the present invention does not require the provision of ribs or the like on the wall surface of the container body, does not require the shape and structure of the container body to be complicated, and prevents the deformation due to the reduced pressure. It is intended to provide.

[0008]

Means for Solving the Problems The present inventors have improved a plate-like packing to be highly elastic without changing the shape of the container, while keeping the container in a simple shape, for example, a cylindrical shape. Furthermore, by improving the structure of the cap as needed, it has been possible to prevent deformation and destruction of the container body due to decompression of the upper space in the container body.

That is, the present invention comprises a container body formed of a hard plastic material, a plate-like packing covering an opening of the container body, and a cap mounted on the container body from above the packing. A container whose contents are hot-filled, wherein the packing is mainly made of an elastic body which can be bent and deformed into the container main body before deformation of the container main body occurs when the inside of the container main body is depressurized by cooling. And a conductive path is formed between the packing and the cap, through which air outside the container body can be introduced when the packing is flexed and deformed.

[0010] The packing may have gas barrier properties, and a surface of the packing facing the inside of the container may be provided with an oxygen scavenger.

The preferred elastic modulus (rigidity) of the packing of the present invention is as follows: the packing is supported by a support having an inner diameter of 65 mm, and the center of the packing is vertically pressed by a pressing member having a tip of 12.5 mmR. The pressing load when the central portion is deformed by 5 mm is set to be 1.5 kg or less.

Further, as the conductive path in the present invention, it is possible to exemplify forming a groove or a hole through which external air can be introduced inside the cap.

According to the present invention, a synthetic rubber is used in place of a packing made of low foamed polyethylene or the like, which has a high elastic modulus (rigidity) and is hardly deformed, for covering the opening of the container body and sealing the inside of the container body. A material having a relatively low elastic modulus (rigidity) such as an elastomer represented by a rubber or a thermoplastic elastomer is used. In a container using this packing, when the pressure after the content is hot-filled and the pressure in the upper space (head space) of the container body starts to be reduced, the packing is carried out before the container body is deformed. The main body is elastically bent and deformed so as to be convex inward, and the bent deformation reduces the volume of the upper space of the container body sealed by the packing, thereby alleviating the pressure drop in the upper space. . Therefore, the pressure in the upper space does not decrease so much as to deform the container main body, and the deformation of the container main body during cooling can be prevented. In order to effectively prevent the deformation of the container body, it is necessary to set the elastic modulus (rigidity) of the packing within a specific range, but the preferable range is the central part of the 65 mmφ packing. When pressing, the pressing load is 1.
5 kg or less.

In order for the packing to be able to bend and deform inwardly of the container body during the cooling, it is necessary to easily introduce air outside the container into the space between the packing and the cap. If a conduction path for introducing external air is formed between the packing and the cap, the pressure in the space between the packing and the cap will always be increased to the atmospheric pressure when the decompression of the upper space of the container body is started. Can be kept close to. Due to the pressure difference between the pressure close to the atmospheric pressure and the reduced pressure in the upper space (head space) of the container body, the packing can be sufficiently bent and deformed into the container body, and the deformation of the packing reduces the volume in the container body. The effect of reducing the pressure and reducing the degree of pressure reduction can be sufficiently achieved.

As a specific configuration of the conduction path for introducing external air between the packing and the cap, for example, as shown in FIGS. 3 and 4, a packing pressing press formed on the inner surface of the cap is provided. It is effective to form a groove in the ring-shaped rib or to form a small hole in the ring-shaped rib. When such a cap is used, external air can be introduced from the screw portion of the cap through the groove or the small hole into the space immediately above the packing, and a state close to the atmospheric pressure can be maintained. In the case where the packing-shaped ring-shaped rib is not provided and the packing is directly pressed against the container body on the inner surface of the cap, a groove is directly formed on the upper inner surface of the cap, or the upper surface of the cap is extremely formed. A small hole may be penetrated. Alternatively, a groove or notch may be formed in at least one of the screw portions of the container body or the cap.

According to the present invention, as in the case where the volume of the upper space inside the container is large, the hot filling is performed at a high temperature, and the temperature difference at the time of cooling is large, the upper space (head space) inside the container is large. When decompression occurs rapidly, the temperature of hot filling is not so high, the temperature difference during cooling is relatively small,
In both cases where the pressure in the upper space inside the container body is gradually reduced, the effect of reducing the pressure can be exhibited.

In the case where a deoxidizer is attached to the inner surface of a packing having a gas barrier function, the pressure gradually decreases over time due to the consumption of oxygen after the temporary reduction of the internal space due to cooling. However, the present invention is also effective for such a temporal decompression.

When a packing having a substantially gas barrier property is used, the inside of the container body can be completely shielded from the outside air, and even if the contents are foods sensitive to oxygen, etc. , Can protect the contents from oxygen attack.

The present invention is not limited to a relatively wide-mouthed blow container mainly made of high-density polyethylene or the like as shown in FIG. 1, but can prevent deformation under reduced pressure even in a PET bottle or the like containing beverages. Is effective in

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view showing a deformation preventing container of the present invention, FIG. 2 is an enlarged sectional view of a packing and a cap mounting portion, FIG. 3 is a plan view of the cap viewed from the inside, and FIG. It is a partial expanded sectional view of a packing and a cap mounting part. The contents of the container shown in FIG. 1 are, for example, pickled ginger and other processed foods, or seasonings.

The main body 1a of the container body 1 has a cylindrical shape having a circular cross section and a predetermined height. A cap mounting portion 1b is formed at the upper end of the body portion 1a.
A screw portion 1c is integrally formed on an outer peripheral surface of the cap b, and a wide opening 1d is opened at an upper end of the cap mounting portion 1b.
The container body 1 is made of hard plastic by direct blow molding. The hard plastic is mainly composed of high-density polyethylene (HDPE), and an ethylene-vinyl alcohol copolymer (EVO) is used as a gas barrier layer.
H) is a multilayer structure in which the layers are stacked. The specific layer structure is
For example, HDPE / adhesive / EVOH / adhesive / regrind HDPE.

The opening 1d is closed by a plate-like packing 2. This packing 2 is used for cooling after the content is hot-filled and before the body 1a of the container body 1 is deformed when the decompression of the upper space of the container body 1 is started.
Is formed mainly of an elastic body having a relatively low elastic modulus (rigidity) so as to be able to bend and deform as indicated by a chain line. The packing 2 is formed of an elastomer having a specific elastic modulus. As the elastomer, a synthetic rubber or a thermoplastic elastomer of a type having no problem in food safety and hygiene is preferably used.

The synthetic rubber is a nitrile rubber (NB)
R), acrylic rubber (ACM), butadiene rubber (B
R) and urethane rubber (U). As the thermoplastic elastomer, a styrene block copolymer (S
BCs), thermoplastic polyolefin elastomer (TP
Os), thermoplastic polyurethane elastomer (TPU)
s), thermoplastic copolyester elastomer (COPE
s) and soft (plasticized) polyvinyl chloride (PVC).

A foamed resin such as highly foamed polyethylene having an expansion ratio of 3 times or more, preferably 5 times or more can also be used. The packing 2 in the present invention is not limited to those formed of the materials exemplified above, but the elastic modulus (rigidity) of the packing 2 is such that the evaluation result obtained by the following evaluation method falls within a predetermined range. It is preferred that

(Evaluation of Packing Rigidity) FIG. 5 (A)
As shown in (1), packing supports 11, 11 each having a hole of 65 mmφ formed in the center are used as jigs, and packing 2 is fixed by packing supports 11, 11 from above and below. The pressing member 12 is a round bar having a diameter of 30 mmφ, and the pressing portion at the tip has a spherical shape of 12.5 mmR. The center of the free portion having a diameter of 65 mm of the packing 2 supported by the packing supports 11 is vertically pressed by the pressing member 12 at a descent speed of 10 mm / min. At this time, the load F applied to the pressing member 12 and the pressing member 1
2 (indentation amount, deformation amount of packing deformation) δ is converted to tensilon (UTM-4-1, manufactured by Toyo Baldwin Co., Ltd.).
000). The measurement environment is an atmosphere at a temperature of 23 ° C. and a relative humidity of 50%.

When evaluated by the above-described evaluation method, a packing suitable for the present invention is as follows. When the displacement of the pressing member 12, ie, the amount of bending deformation δ at the center of the packing 2, is 5 mm, the load F is 1.5 kg or less. . Also, JIS-K
6301, a preferred range of the hardness of the packing 2 measured according to a spring type mold hardness test type A is 40 to 80.

The packing 2 shown in FIG. 2 has gas barrier properties. As a method for imparting gas barrier properties to the packing 2, the packing itself may be formed of a barrier material, or a polyvinylidene chloride (PVDC) resin may be formed on the surface of an elastic plate made of synthetic rubber or thermoplastic elastomer. Such as coating a gas barrier material layer, or laminating a thin gas barrier film. When the contents to be filled in the container body 1 need to be protected from the influence of oxygen, a deoxidizer 4 for removing oxygen in the upper space of the container body 1 or dissolved oxygen in the contents is used for the packing 2. Attached to the inner surface (lower surface). A deoxygenator containing a sachet (small bag) is used and attached to the inner surface of the packing 2.

A cap 3 is mounted on the cap mounting portion 1b of the container body 1 by being tightened with a screw. The packing 2 is brought into close contact with the opening 1 d of the container body 1 by the tightening force of the cap 3. Cap 3
It is made of polypropylene (PP) or polyethylene (PE).

As shown in FIGS. 2, 3 and 4, the cap 3 is a so-called screw cap, which has a screw portion 3a formed on the inner surface of the cylindrical peripheral wall and is screwed to the screw portion 1c of the container body 1. You. Also, the upper inner surface 3 of the cap 3
At d, a ring-shaped rib 3b is integrally formed to protrude. The cap 3 is a cap mounting portion 1b of the container body 1.
When the packing 3 is tightened, the outer periphery of the packing 2 is pressed against the periphery of the opening 1 d of the container body 1 by the rib 3 b, and the upper space (head space) A inside the container below the packing 2 is packed 2. Sealed. In addition, a groove 3c penetrating through the rib 3b is formed in a portion indicated by a chain line in FIG. 3, as shown in an enlarged manner in FIG. Space B between packing 2 and cap 3
Is communicated with the external space of the container through the groove 3c and the gap between the threaded portions of the screw portions 1c and 3a, so that the space B immediately above the packing 2 can be maintained at a state close to the atmospheric pressure. ing. Therefore, in this example, the gap between the groove 3c and the threaded portion between the thread portions 1c and 3a is a conduction path for introducing external air. Instead of forming the groove 3c, a small hole penetrating the rib 3b may be formed.

In the deformation preventing container of the present invention, contents such as processed food are hot-filled in the body 1a of the container body 1, the packing 2 is mounted in the opening 1d, and the cap 3 is fastened. When the upper space A above the contents of the container main body 1 is decompressed by the subsequent cooling, before the body 1a of the container main body 1 is deformed, the packing 2 is closed as shown by a chain line in FIG. It is elastically deformed in the direction of the upper space A of the main body 1. At this time, external air enters the space B between the packing 2 and the cap 3 through the groove 3c formed in the cap 3 and the gap between the screw portions 1c and 3a, and the space B becomes substantially equal to the atmospheric pressure. The packing 2 is easily deformed into the upper space A. Due to the elastic deformation of the packing 2, the substantial volume of the upper space A decreases, and the upper space A
Of the internal pressure is alleviated. Therefore, it is possible to prevent the container body 1 from being deformed such as a dent or to be damaged by the decompression during cooling.

In the case where the oxygen absorber 4 is attached to the lower surface (inner surface) of the packing 2, the oxygen absorber consumes the oxygen inside the container body 1 even after cooling, so that the upper space A gradually decreases with time. The packing is also reduced
Are deformed so as to bend into the upper space A, so that a decrease in pressure in the upper space A can be reduced.

[0032]

EXAMPLES Examples of the deformation preventing container of the present invention and comparative examples, and evaluation of the examples and comparative examples will be described below. (Preparation of Bottle) The multilayer resin was extruded using a plurality of extruders, and the container body 1 of the wide-mouth blow container shown in FIG. 1 was formed by a direct blow method. The inner diameter of the body 1a of the container body is 97 mmφ, and the height of the entire container is 166 m.
m, the opening diameter of the opening 1d was 67.5 mmφ, the total volume of the inner space of the body 1a and the cap mounting portion 1b was 1160 cc, and the basis weight was 75 g. The wall thickness of the body 1a is at least 90.
0 μm, maximum 1270 μm, average about 1150
μm.

The layer structure of the hard plastic constituting the container body 1 is HDPE / adhesive / EVOH / adhesive / regrind / HDPE from the outside. HDPE has a density of 0.954, an MFR of 0.25, and a flexural rigidity of 1300.
A sample having a weight of 0 kg / cm ² (Showa Aroma, manufactured by Showa Denko KK) was used. EVOH uses a substance having an ethylene content of 32 mol% (manufactured by Nippon Synthetic Chemical Co., Soarnol),
The adhesive used was maleic anhydride-modified graft PE (manufactured by Mitsui Petrochemical, Admer).

(Preparation of Cap) As the cap 3, a commercially available polypropylene screw cap capable of engaging with the screw portion 1c of the container body 1 was used. The shape of the cap 3 is as shown in FIGS. 2 to 4, and a ring-shaped rib 3b for pressing the packing is formed on the upper inner surface. The rib 3b has a diameter of 68 mmφ and a raised height of 3
mm. In the cap used in the embodiment, FIG.
As shown in FIG. 7, a groove 3c crossing the rib 3b was formed on the upper inner surface 3d. The depth and width of the groove 3c are appropriately determined depending on the opening diameter of the opening 1d of the container body, the internal volume of the container body, the volume of the upper space A after the contents are filled, and the like. 3c is not only the ribs 3b but also the upper inner surface 3d into the wall thickness within a minimum of 0.2 mm and a maximum of 1 m
m cut in width, minimum 0.5mm, maximum 1.5mm
It was made.

(Production of Packing) Example-1 Synthetic rubber (NBR) having a thickness of 1.5 mm and a diameter of 95 mm
PVDC as a gas barrier coat on the surface of
Was coated with a thickness of 2 μm. J
The hardness measured by IS-K6301 was 62. Example 2 A commercially available packing made of expanded polyethylene having a thickness of 1.5 mm, a diameter of 95 mm, and a degree of foaming of 5 times was used. JIS
The hardness at -K6301 was 63. A sachet (small bag) containing a deoxidizer ("Ageless" manufactured by Mitsubishi Gas Chemical Co., Ltd.) was attached to the inner surface of the packing. Example 3 A synthetic rubber packing (hardness 62) coated with the same PVDC as shown in Example 1 above was attached with a sachet (small bag) containing an oxygen scavenger. used. -Example-4 Synthetic rubber (NBR) having a thickness of 1.5 mm and a diameter of 95 mm
A packing (hardness: 64) coated with PVDC having a thickness of 2 μm was used for the disk of No. 1.・ Comparative Example-1 Made of low-expanded polyethylene having an expansion ratio of 1.5 and a thickness of 1.5.
Commercial packing having a diameter of 95 mm and a diameter of 95 mm was used. Comparative Example 2 The same packing as that of Comparative Example 1 was used, in which a deoxygenated sachet was attached to the lower surface.

(Evaluation of Packing Rigidity) FIG. 5 (A)
The rigidity of each packing of Example-1 to Example-4 and the packing of Comparative Example-1 and Comparative Example-2 was evaluated by the method shown in FIG. FIG. 5B shows the result. FIG.
(B) shows the amount of movement of the pressing member 12 (the amount of deflection at the center of the packing) δ on the horizontal axis and the load F on the vertical axis.
According to this evaluation result, the packings of Examples -1 to -4 all have a load F when the center portion is displaced by 5 mm.
Was 1.5 kg or less, and in fact, all were 1.0 kg or less. On the other hand, in Comparative Example-1 and Comparative Example-2, the displacement δ
Is 5 mm, the load F exceeds 2 kg.

(Decompression Test) In the container using the packings of Examples 1 to 4 described above, the packing is attached to the opening 1d of the container body 1, and the upper inner surface 3d as shown in FIG. And a cap 3 having a single groove 3c formed in the rib 3b. Comparative Example-
1. In the container using the packing of Comparative Example-2, a commercially available polypropylene cap in which the groove 3c was not formed was directly attached to the container body.

A conduit was fixed to each of the container bodies 1 equipped with the packings of Examples 1 to 4 and Comparative Examples 1 and 2, and a leak tester was connected to the conduit. It was set so that the decompressed state of the upper space (head space) A inside the container body 1 could be measured and recorded. Then, hot water of 60 ° C.
Pack it with 0cc, attach the packing and cap, 5 ℃
Cooled down. Then, the degree of pressure reduction in the upper space A inside the container body with the passage of time was measured and recorded, and it was further observed whether the container body was deformed.

(Results) Deformation of the container body was observed for 100 hours after cooling, and a comparative example using an oxygen scavenger was used.
In No. 2, remarkable dent deformation was confirmed in the trunk portion 1a of the container body 1. Further, in Comparative Example-1 in which no oxygen scavenger was used, slight depression deformation was confirmed in the trunk portion 1a. However, no deformation was observed in any of Example-1 to Example-4.

FIG. 6 shows a second embodiment and a second embodiment in which packing having relatively high rigidity is used among the packings of the embodiment.
4 shows the measurement results of the degree of reduced pressure in the upper space A inside the container in Comparative Examples 1 and 2. The horizontal axis (logarithmic axis) indicates the elapsed time after cooling the container body to 5 ° C., and the vertical axis indicates the degree of decompression of the upper space A by (−mmHg). FIG.
As shown in Comparative Example 2, in which the oxygen absorber was used, the pressure in the upper space A decreased for a long time,
At the time when the time had elapsed, the degree of reduced pressure exceeded -150 mmHg. In Comparative Example-2, a slight dent deformation was confirmed in the body portion 1a at the time of one hour after cooling, and the dent deformation was gradually amplified from the lapse of about 10 hours. A considerably large dent deformation was confirmed in the body 1a. Comparative Example not using oxygen scavenger-
In No. 1, a slight dent deformation appeared in the trunk portion 1a at the point of time one hour after cooling, as in Comparative Example 2, and the state continued.

From the above, the container body 1 used in the present test was a critical point at which the pressure was reduced to about -140 mmHg in the upper space A at a limit point at which the deformation was caused by -150 mm.
It was found that the deformation further progressed when Hg was exceeded.
In contrast, in Example-2 using an oxygen scavenger and Example-4 not using an oxygen scavenger, the degree of decompression at the time when 100 hours had elapsed was sufficiently lower than -140 mmHg. It was confirmed that the deformation limit of the container body was not reached.

[0042]

As described above, in the present invention, by using an elastomer having a relatively low elastic modulus as the packing, it is possible to reduce the pressure in the internal space after hot filling of the contents and to use an oxygen scavenger. The decompression is alleviated, and deformation and breakage of the container body can be prevented. In addition, by forming an air passage in the cap immediately above the packing, the packing is easily deformed when the pressure inside the container is reduced, and the deformation of the container can be more effectively prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a direct-blow-molded wide-mouthed container body,

FIG. 2 is an enlarged cross-sectional view showing a state where a packing and a cap are attached to a container body.

FIG. 3 is a plan view of the cap as viewed from the inside,

FIG. 4 is a partially enlarged sectional view of a mounting portion of a packing and a cap,

FIG. 5 (A) is an explanatory diagram of a method for evaluating the packing rigidity, FIG. 5 (B) is a diagram showing the evaluation results of the packing rigidity of each embodiment and each comparative example,

FIG. 6 is a diagram showing pressure reduction test results of an example and a comparative example;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 1a Body 1d Opening 2 Packing 3 Cap 3b Ring-shaped rib 3c Groove

Claims (5)

[Claims] 1. A container body formed of a hard plastic material, a plate-shaped packing covering an opening of the container body, and a cap mounted on the container body from above the packing, wherein the contents are A hot-filled container,
The packing is formed mainly of an elastic body which can be bent and deformed inwardly of the container body before deformation of the container body occurs when the inside of the container body is depressurized by cooling, and when the packing is bent and deformed. A deformation preventing container, wherein a conduction path through which air outside the container body can be introduced is formed between the packing and the cap. 2. The deformation preventing container according to claim 1, wherein the packing has a gas barrier property. 3. The deformation-preventing container according to claim 1, wherein an oxygen scavenger is attached to a surface of the packing that faces the inside of the container body. 4. The packing is supported by a support having an inner diameter of 65 mm, and when the center of the packing is vertically pressed by a pressing member having a tip of 12.5 mmR, the center is 5 mm.
The deformation preventing container according to any one of claims 1 to 3, wherein a pressing load at the time of deformation is 1.5 kg or less. 5. The inside of a cap as the conduction path,
5. The deformation preventing container according to claim 1, wherein a groove or a hole through which external air can be introduced is formed.