JP2011143953A - Resin container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin container capable of preventing cracks (crazes) of a ground contact part when the container is dropped. <P>SOLUTION: The resin container includes a mouth part located at the upper end in the axial direction of the container, a cylindrical barrel part expanded from the mouth part, and a bottom part for closing the lower end of the barrel part in the axial direction of the container, and formed with a raised portion 7 raised inward of the container on the bottom part, and an annular ground contact part 8 in contact with a loading surface in an upright state on the outer circumferential side of the raised portion. The ground contact part has a half cross-section formed in a radiused shape toward the outside of the container. The radius dimension R3 of both an internal ground contact part 13 constituting the inner side at the ground contact part and an external ground contact part 12 constituting the outer side is set to be 7-13 mm. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resin container such as a plastic bottle containing a carbonated beverage, and more particularly to a resin container capable of suppressing the occurrence of cracks.

  In recent years, resin containers molded with a synthetic resin such as polyethylene terephthalate (PET) have been widely used as beverage containers for filling carbonated drinks and the like. The resin container made of PET has many advantages such as excellent gas barrier properties, high transparency and toughness, and also has the property of not transferring the odor of the contents. Such a resin container includes a mouth portion located at the upper end in the container axial direction, a cylindrical trunk portion whose diameter is expanded from the mouth portion, and a bottom portion that closes the lower end in the container axial direction of the trunk portion. It has become common.

  As for the bottom shape of the resin container, a raised portion that protrudes inward of the container is formed, and the bottom of the champagne that has an annular grounding portion that contacts the placement surface in a standing state on the outer peripheral side of the raised portion Yes, this bottom shape improves the pressure resistance that can withstand the internal pressure of the container caused by carbon dioxide gas, and the self-supporting property. As a resin container having such a bottom part shape, for example, in Patent Document 1, a part other than the ground contact part of the bottom part is formed to be ultrathin, and a reinforcing rib is formed on the bottom wall, thereby forming an ultrathin container. Reinforcement ribs absorb the impact force when dropped and prevent rupture. Moreover, in patent document 2, the deformation | transformation of the bottom part at the time of filling the high temperature contents is prevented by limiting the range of the average crystallinity degree of the grounding part of a bottom part.

Japanese Patent Laid-Open No. 10-139029 JP 2005-104500 A

  On the other hand, when the resin container falls from the bottom, the grounding portion may first hit the dropping surface, and the impact force at the time of dropping may concentrate on the grounding portion. In this case, the resin container may be broken due to a crack in the grounding portion or may be cracked in the grounding portion even if it does not break. In addition, the resin container after the contents are filled and shipped is transported, and in some cases, stored in a storage, and sold in a store or sold by a vending machine. In such a state, the grounding part is subjected to a force multiple times under various temperature environments, and when falling, the grounding part is likely to be cracked or cracked (hereinafter simply referred to as cracking). Become. By simply forming reinforcing ribs on the bottom wall as in Patent Document 1 or limiting the range of the average crystallinity of the grounding portion at the bottom as in Patent Document 2, such a crack in the grounding portion is sufficient. Cannot be prevented.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a resin container that can prevent a grounding portion from cracking when dropped.

In order to achieve the above object, the following technical measures were taken.
That is, the resin container of the present invention is a resin container that is integrally formed of resin and is filled with contents that increase the internal pressure in a sealed state, and has a mouth portion that is positioned at the upper end in the container axial direction. The cylindrical body portion having a diameter expanded from the mouth portion and a bottom portion for closing the lower end in the container axial direction of the body portion, and a bulge portion that protrudes inward of the container is provided at the bottom portion. In the resin container in which an annular grounding portion that contacts the placement surface in a standing state is formed on the outer peripheral side of the portion, the grounding portion is formed in a single-section R shape toward the outside of the container, and the grounding portion Among these, the R dimension of one or both of the inner grounding portion constituting the inner side and the outer grounding portion constituting the outer side is 7 mm to 13 mm.

  In the case of the resin container of the present invention, the grounding portion is formed in a single-section R shape toward the outside of the container, and the inner grounding portion constituting the inner side and the outer grounding portion constituting the outer side of the grounding portion. Since the R dimension of either one or both is 7 mm to 13 mm, even when the impact force at the time of dropping is concentrated on the grounding part, the impact force depends on the R shape and R dimension of the grounding part. Distributed. Thereby, the crack of the grounding part at the time of dropping can be prevented.

  The grounding portion is preferably formed with a thickness of 1.2 mm or more. In this case, the strength of the grounding portion is improved, and the impact force can be reduced by the thick resin of the grounding portion.

  Various ring shapes can be employed for the grounding portion, and examples thereof include those formed in an annular shape centering on the container axis. If the ground contact portion is annular, a region that receives an impact at the time of dropping can be expanded, and the impact force can be reduced.

  As described above, when the grounding portion is formed in an annular shape, the R dimension of the inner grounding portion is preferably in the range of 12% to 45% of the diameter dimension of the grounding portion. By adopting a bottom shape in which the R dimension of the inner grounding part is within the range of the diameter dimension of the grounding part, it is possible to improve the strength against impact force at the time of dropping in the grounding part.

  When the trunk portion is formed in a circular cross section, it is preferable that a diameter dimension of the grounding portion is in a range of 40% to 85% of an outermost diameter dimension of the trunk portion. By adopting the shape of the resin container in which the diameter dimension of the grounding part is within the range of the outermost diameter dimension of the body part, it is possible to obtain a resin container that is not easily toppled and has excellent design.

  As described above, according to the present invention, the grounding portion is formed in a single cross-section R shape toward the outside of the container, and among the inner grounding portion constituting the inner side of the grounding portion and the outer grounding portion constituting the outer side, Since either or both of the R dimensions are 7 mm to 13 mm, even if the impact force at the time of dropping is concentrated on the grounding portion, the impact force is dispersed by the R shape and R dimension of the grounding portion. . Thereby, the crack of the grounding part at the time of dropping can be prevented.

It is a side view of the resin container concerning one embodiment of the present invention. It is the perspective view which looked at the bottom of a resin container, and its neighborhood from the lower part. It is sectional drawing of the bottom part of a resin container, and its vicinity. It is explanatory drawing for demonstrating the shape of a bottom part.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a resin container 1 according to an embodiment of the present invention. A resin container 1 shown in FIG. 1 includes a mouth 2 located at the upper end of the container axial direction (up and down direction in FIG. 1), a shoulder 3 formed continuously with the mouth 2, and a shoulder 3 The body 4 is formed continuously, and the bottom 5 is formed on one side of the body 4, and is formed in a cylindrical shape from the mouth 2 to the bottom 5. The resin container 1 is a resin container integrally formed of polyethylene terephthalate, which is a thermoplastic resin, and can be sealed with a lid (not shown) after being filled with a carbonated beverage as a content. Yes. In the following description, the lower side in the container axis direction is simply referred to as the lower side, and the upper side in the container axis direction is simply referred to as the upper side.

  The mouth portion 2 is formed in a circular cross section as a whole. The mouth portion 2 is provided with a thread 6 for attaching a lid (not shown) and a neck ring 7 below the thread 6. . By screwing the lid into the mouth portion 2, the filled contents are sealed. The shoulder portion 3 is formed so as to gradually increase in diameter from the mouth portion 2, and the body portion 4 is continuously formed at the lower end 3 a of the shoulder portion 3. The trunk | drum 4 is formed in the cross-sectional circular shape of the same diameter from the upper end 4a to the lower end 4b.

  2 is a perspective view of the bottom portion 5 of the resin container 1 and the vicinity thereof as viewed from below, FIG. 3 is a cross-sectional view of the bottom portion 5 of the resin container 1 and the vicinity thereof, and FIG. It is explanatory drawing for demonstrating the shape of this. The bottom part 5 closes the lower end 4b of the body part 4, and is formed in a bowl shape with a circular cross section that decreases in diameter as it goes downward. Further, the bottom 5 includes a raised portion 7 that protrudes inward of the container formed in the center portion of the bottom, a grounding portion 8 that is formed on the outer peripheral side of the raised portion 7 and contacts the placement surface G in an upright state, The outer peripheral portion 9 formed on the outer peripheral side of the grounding portion 8 is a champagne bottom.

  As shown also in FIG. 3, the upper end 9a of the outer peripheral part 9 is following the lower end 4b of the trunk | drum 4, and the said outer peripheral part 9 is formed in the cross-sectional circular shape which diameter-reduces as it goes below. As shown also in FIG. 4, the cross section of the outer peripheral part 9 is made into R shape which goes outside a container, and the lower part of the resin container 1 is narrowed gently as it goes below.

  The grounding portion 8 is formed in an annular shape centering on the container axis 10 as a whole (see FIG. 2), and one cross section of the grounding portion 8 is curved toward the outside of the container. The grounding portion 8 includes an outer grounding portion 12 on the outer peripheral side continuous with the outer peripheral portion 9 via the corner portion 11 and an inner grounding portion 13 on the inner peripheral side continuous with the outer grounding portion 12 (see FIG. 4). ). The outer grounding portion 12 and the inner grounding portion 13 are formed in a single-section R shape with the same R dimension.

  The grounding portion 8 formed in this way is a part that comes into contact with the placement surface G when the resin container 1 is made to stand on its own, and its one-section is curved outward from the container. The mounting surface G is in line contact with the annular shape. The boundary between the outer grounding portion 12 and the inner grounding portion 13 is the lower end of the grounding portion 8 and is the contact portion S where the grounding portion 8 actually contacts the placement surface G. The grounding portion 8 is a contact portion S that contacts the placement surface G and its vicinity. In the resin container 1 of the present embodiment, 4.5 mm (outer grounding) outward in the radial direction of the contact portion S. Part), an area of 8.5 mm (inner grounding part) radially inward.

  The raised portion 7 that is continuous with the grounding portion 8 is raised upward from the grounding portion 8 toward the container axis 10, and one side of the raised portion 7 has an R shape.

  The dimensions of the respective parts are as follows (see FIG. 1). The outer diameter D1 of the mouth 2 is 26 mm, the outer diameter D2 of the body 4 is 83 mm, the diameter D3 of the contact portion S is 40 mm, the height H1 of the body 4 is 70 mm, and the height H2 of the bottom 5. Is 33 mm, and the height dimension from the contact portion S to the top portion 7 a of the raised portion 7 (height dimension combining the inner grounded portion 13 of the grounding portion 8 and the raised portion 7) H3 is 11 mm. In addition, the diameter dimension of the grounding part 8 as used in the field of this invention shall mean the diameter dimension D3 of the contact part S. FIG. In the following description, the diameter dimension D3 of the contact portion S is referred to as the diameter dimension D3 of the grounding portion 8.

  The R dimension of each part of the bottom 5 is as follows (see FIG. 4). The R dimension R1 of the outer peripheral part 9 is 65 mm, the R dimension R2 of the corner part 11 is 5 mm, the R dimension R3 of the outer grounding part 12 and the inner grounding part 13 of the grounding part 8 is 10 mm, and the R dimension R4 of the raised part 7 is 14 mm. is there.

  The grounding portion 8 constituting a part of the bottom portion 5 is formed with a thickness T1 (the thickness of the molded product) of 1.5 mm. In the present embodiment, the thickness T1 of the bottom portion 5 including the ground contact portion 8 is 1.5 mm, and the thickness T2 of the other trunk portions 4 and the like is 1.0 mm or less, which is smaller than the ground contact portion 8. (See FIG. 3). The thickness T1 of the grounding portion 8 is changed according to the specifications of the resin container 1, and the thickness T1 is preferably 1.2 mm or more, and is 1.5 mm or more as in the present embodiment. More preferably it is.

  As described above, the diameter dimension D3 of the grounding portion 8 is 40 mm, the R dimension R3 of the inner grounding portion 13 of the grounding portion 8 is 10 mm, and the R dimension R3 of the inner grounding portion 13 is the diameter dimension D3 of the grounding portion 8. Of 25%. The R dimension R3 of the inner grounding portion 13 and the diameter dimension D3 of the grounding portion 8 are changed according to the specifications of the resin container 1, but the R dimension R3 of the inner grounding portion 13 is the diameter of the grounding portion 8. It is preferable to be within a range of 12% to 45% of the dimension D3.

  Further, as described above, the diameter dimension D3 of the grounding portion 8 is 40 mm, the outer diameter dimension D2 of the trunk portion 4 is 83 mm, and the diameter dimension D3 of the grounding portion 8 is 48% of the outer diameter dimension D2 of the trunk portion 4. Has been. The diameter dimension D3 of the grounding part 8 and the outer diameter dimension D2 of the trunk part 4 are changed according to the specifications of the resin container 1, but the diameter dimension D3 of the grounding part 8 is the outer diameter dimension of the trunk part 4. It is preferably within the range of 40% to 85% of D2. Here, the outer diameter dimension D2 of the trunk portion 4 is the largest outer diameter dimension (outermost diameter dimension) when the outer diameter changes in the longitudinal direction when the trunk portion 4 has a circular cylindrical shape. It shall be said.

  Said resin container 1 is shape | molded by the biaxial stretch blow molding method which consists of a preform shaping | molding process and a blow molding process. In the preform molding step, a preform as a preform is molded with a preform molding die, and in the blow molding step, the obtained preform is stretch blow molded in a blow molding die. More specifically, molten PET as a raw material is injected into a preform molding die provided with an in-core that forms a hollow portion by an injection molding machine, and a mouth portion, a hollow cylindrical portion, and a hemisphere A preform composed of a bottom of the shape is molded.

  Subsequently, in a state where the mouth portion of the obtained preform is sandwiched, a blow mold is attached to the preform, and stretched in the container axial direction with a stretch rod inserted into the hollow portion, The container is stretched in the container radial direction by the introduced gas. By this biaxial stretching, the resin container 1 is molded along the shape of the cavity of the blow mold. Here, in order to form the outer grounding portion 12, the inner grounding portion 13, the outer peripheral portion 9, the raised portion 8 and the like into the R shape with a single cross section, the molding corresponding to each portion of the blow molding die. The shape and dimensions of the surface may be set according to them.

  The resin container 1 of the present embodiment configured as described above is used as a resin container filled with contents that increase the internal pressure in a sealed state, and has sufficient pressure resistance to maintain the container shape, Has independence. Specifically, the resin container 1 is suitably used when filling various carbonated drinks with a high gas volume. The gas volume is a numerical value obtained by dividing the volume of the gas dissolved in the beverage by the volume of the beverage in the standard state, and is a unit representing the content of carbon dioxide in the beverage.

  In the case of the resin container 1 of the present embodiment, the grounding portion 8 is formed in a single cross-section R shape toward the outside of the container, and the outer grounding portion 12 constituting the outer side of the grounding portion 8 and the inner side are formed. Since the R dimension of the inner grounding portion 13 is 10 mm, even when the impact force at the time of dropping is concentrated on the grounding portion 8, the impact force is dispersed by the R shape and R dimension of the grounding portion 8. The Thereby, the crack of the grounding part 8 at the time of dropping can be prevented. In addition, the resin container 1 after the contents are filled and shipped is transported and stored in a storage in some cases, sold at a store or sold by a vending machine, and various temperatures are supplied to the grounding unit 8. Even when a force is applied multiple times under the environment, the grounding part 8 can be prevented from cracking due to the above-described shape and size of the grounding part 8 due to the crack prevention effect.

  In the present embodiment, by setting the R dimension of both the outer grounding part 12 constituting the outer side and the inner grounding part 13 constituting the inner side to 10 mm, the grounding part 8 has one R dimension. Although formed, the outer grounding portion 12 and the inner grounding portion 13 may both have a single-section R shape, and one of the R dimensions may be 10 mm. Specifically, each of the outer grounding portion 12 and the inner grounding portion 13 has a single-section R shape, and the R dimension of only the outer grounding portion 12 is 10 mm, or both the outer grounding portion 12 and the inner grounding portion 13 are R. The R dimension of only the inner ground contact portion 13 is 10 mm.

  The R dimension of the outer grounding portion 12 and the inner grounding portion 13 is preferably 7 mm to 13 mm, and more preferably 9 mm to 11 mm as in the present embodiment. If the R dimension of both the outer grounding portion 12 and the inner grounding portion 13 is less than 7 mm, the impact force at the time of dropping cannot be sufficiently dispersed, and the grounding portion 8 may be cracked. If the R dimension of both 12 and the inner grounding portion 13 exceeds 13 mm, the grounding portion 8 is insufficient in strength against impact force when dropped, and the grounding portion 8 may be cracked or deformed.

  Since the grounding portion 8 of the bottom portion 5 constituting the resin container 1 is formed with a thickness T1 of 1.2 mm or more, the strength of the grounding portion 8 is improved and the thickness of the grounding portion 8 is increased. The impact force can be reduced by the resin. If the thickness of the grounding portion 8 is less than 1.2 mm, the strength is not sufficient, and it is difficult to reduce the impact force. Here, the outer peripheral part 9 (bottom part 5), the raised part 7 (bottom part 5), the trunk part 4 and the like other than the grounding part 8 are smaller in thickness than the grounding part 8, and the same thickness as the grounding part 8. Alternatively, it may be thicker than the grounding portion 8. In the present embodiment, the grounding portion 8, the raised portion 7, and the outer peripheral portion 9 have the same thickness T1, and the trunk portion 4 has a smaller thickness T2. However, for example, the raised portion 7 is replaced with the grounding portion 8. And the wall thickness larger than the ground contact portion 8, and the outer peripheral portion 9 is made the same thickness as the ground contact portion 8 or smaller than the ground contact portion 8.

  When the outer peripheral portion 9 and the raised portion 7 are formed with a thickness smaller than that of the grounding portion 8, the grounding portion 8 is made to have a thickness of 1.2 mm or more, and the thickness is gradually reduced from a place away from the grounding portion 8. Alternatively, the contact portion S of the ground contact portion 8 is set to the maximum thickness, and the thickness is gradually reduced from the outer peripheral portion 9 to the raised portion 7 while maintaining a thickness of 1.2 mm or more at the ground contact portion 8 as the distance from the contact portion S increases. You just have to.

  In addition, since the ground contact portion 8 has an annular shape, a region that receives an impact when dropped is widened, and the impact force can be reduced. Since the R dimension R3 of the inner grounding portion 13 constituting the inner peripheral side of the grounding portion 8 adopts a bottom shape that is within a range of 12% to 45% of the diameter dimension D3 of the grounding portion 8, the grounding portion The strength against the impact force at the time of dropping in 8 can be improved. If the R dimension R3 of the inner grounding portion 13 is a bottom shape exceeding 45% of the diameter D3 of the grounding portion 8, the strength against the impact force at the time of dropping at the grounding portion 8 cannot be improved. The raised portion 7 is easily deformed by the internal pressure of the object, and the shape of the resin container 1 is difficult to maintain. If the R dimension R4 of the inner grounding portion 13 is a bottom shape that is less than 12% of the diameter D3 of the grounding portion 8, the impact force at the time of dropping in the grounding portion 8 cannot be sufficiently dispersed, and the grounding portion 8 may be cracked.

As a modification of the resin container, the R dimension R3 of the inner grounding portion 13 constituting the inner peripheral side of the grounding part 8 is in the range of 12% to 45% of the diameter dimension D3 of the grounding part 8 as the following modifications What has is suitable. The values in parentheses are values obtained by dividing the R dimension R3 of the inner grounding portion 13 by the diameter dimension D3 of the grounding portion 8.
When D3 is 35 mm, R3 is 5.0 mm (14%), 10 mm (29%), and 15 mm (43%).
When D3 is 40 mm, R3 is 5.0 mm (13%), 10 mm (25%), 15 mm (38%).
When D3 is 44 mm, R3 is 10 mm (23%) and 15 mm (34%).

  Since the shape of the resin container 1 is adopted in which the diameter dimension D3 of the grounding part 8 is in the range of 40% to 85% of the outer diameter dimension D2 of the body part 4, it is difficult to fall down and is excellent in design. The resin container 1 can be obtained. If the diameter dimension D3 of the grounding part 8 is less than 40% of the outer diameter dimension D2 of the body part 4, the resin container 1 will easily fall over, and if the diameter dimension D3 exceeds 85% of the outer diameter dimension D2. Good designability cannot be obtained.

As a modified example of the resin container in which the diameter D3 of the grounding portion 8 is in the range of 40% to 85% of the outer diameter D2 of the trunk portion 4, one having the following dimensions is preferable. The values in parentheses are values obtained by dividing the diameter D3 of the grounding portion 8 by the outer diameter D2 of the trunk portion 4.
When D2 is 84 mm, D3 is 35 mm (42%), 40 mm (48%), and 44 mm (53%).
When D2 is 55 mm, D3 is 35 mm (63%), 40 mm (73%), and 44 mm (80%).

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. In addition, this invention is not limited to a following example.

The produced resin container is filled with 4.0 gas volume of carbonated water, sealed, put in a thermostat adjusted to 30 ° C., and taken out of the thermostat after two weeks. A drop test of the resin container after being allowed to cool was performed.
(Drop test) The resin container was dropped from a height of 2 m so that the grounding part hit the falling surface, and the state of the grounding part was observed. Forty resin containers of each Example and each Comparative Example were performed.

[Example]
(Embodiment 1) One-section R shape of the grounding part toward the outside of the container, the R dimension of the outer grounding part is 6 mm, the R dimension of the inner grounding part is 10 mm, and the diameter dimension of the grounding part is 40 mm. The same resin container as that of the above embodiment was manufactured.
(Example 2) One-section R shape of the grounding portion toward the outside of the container, the R dimension of the outer grounding portion and the inner grounding portion is 10 mm, the diameter dimension of the grounding portion is 40 mm, and other dimensions are the same as those of the above embodiment. The same plastic container as the one was made.

[Comparative example]
(Comparative Example 1) One-section R shape with the grounding portion facing outward from the container, the R dimension of the outer grounding portion is 6 mm, the R dimension of the inner grounding portion is 5 mm, and the diameter dimension of the grounding portion is 40 mm. The same resin container as that of the above embodiment was manufactured.
(Comparative Example 2) One-section R-shape of the grounding portion toward the outside of the container, R dimension of the outer grounding portion and the inner grounding portion is 15 mm, the diameter of the grounding portion 8 is 35 mm, and other dimensions are those of the above embodiment. The same resin container as in the above was manufactured.

The results of the drop test of the resin container of each example and the resin container of each comparative example are as follows. The result is shown by [number of cracks / 40].
Example 1: 1/40, Example 2: 0/40 Comparative Example 1: 9/40, Comparative 2: 8/40

  The resin container of each embodiment in which the R dimension of either or both of the inner ground portion and the outer ground portion constituting the ground portion is in the range of 7 mm to 13 mm is both the inner ground portion and the outer ground portion. It is recognized that there are fewer cracks when dropped than the resin containers of the comparative examples in which the R dimension is outside the range of 7 mm to 13 mm.

  The resin containers of the embodiments and examples disclosed above are examples of the resin container according to the present invention, and the shape, size, and R dimension of each part are appropriately changed. The resin constituting the resin container is a thermoplastic resin such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polylactic acid, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene, etc. These resins or a blend of these resins and other resins can be used as a raw material. Among these, polyethylene terephthalate is particularly preferably used as in this embodiment.

  The above resins contain various resin additives such as colorants, antioxidants, UV absorbers, mold release agents, lubricants, nucleating agents, and antistatic agents, as long as the quality of the resin container is not impaired. can do. Furthermore, in addition to the case where the resin container is formed of a single layer resin as in this embodiment, the resin container can be formed of two or more layers of resin. For example, the outer layer and the inner layer may be two layers, or the outer layer, one or a plurality of intermediate layers, and the inner layer may be a plurality of layers exceeding two layers.

  In this case, an intermediate layer that improves the functionality of the resin container can be employed. The intermediate layer may be a gas barrier layer, for example, so that oxygen permeation from the outside into the container is suppressed to prevent the contents from being altered. Moreover, you may coat a single layer, the outer surface of multiple layers, or an inner surface. The scope of the present invention is not limited to the embodiments and examples described above, but is defined by the scope of the claims, and includes meanings equivalent to the scope of the claims and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1 Resin container 4 Trunk part 5 Bottom part 7 Raised part 8 Grounding part 9 Outer peripheral part 10 Container axial core 12 Outer grounding part 13 Inner grounding part S Contact part G Mounting surface

Claims (5)

A resin container that is integrally formed with resin and filled with contents that increase the internal pressure in a sealed state,
A mouth portion positioned at the upper end of the container axial direction, a cylindrical barrel portion whose diameter is expanded from the mouth portion, and a bottom portion that closes the lower end of the barrel portion in the container axial direction. In the resin container in which an annular grounding portion is provided on the outer peripheral side of the raised portion and in contact with the mounting surface in a standing state,
The grounding portion is formed in a R shape having a single cross section toward the outside of the container, and one or both of the R of the inner grounding portion constituting the inner side and the outer grounding portion constituting the outer side of the grounding portion. A resin container having a size of 7 mm to 13 mm.   2. The resin container according to claim 1, wherein the grounding portion is formed with a thickness of 1.2 mm or more.   The resin container according to claim 1, wherein the grounding portion is formed in an annular shape centering on a container axis.   4. The resin container according to claim 3, wherein an R dimension of the inner grounding portion is in a range of 12% to 45% of a diameter dimension of the grounding portion.   The said trunk | drum is formed in the cross-sectional circle shape, The diameter dimension of the said earthing | grounding part is made into the range of 40%-85% of the outermost diameter dimension of the said trunk | drum. 4. The resin container according to 4.

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