JP5692631B2

JP5692631B2 - Synthetic resin round frame

Info

Publication number: JP5692631B2
Application number: JP2010171716A
Authority: JP
Inventors: 浩通斉藤
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 2010-07-30
Filing date: 2010-07-30
Publication date: 2015-04-01
Anticipated expiration: 2030-07-30
Also published as: JP2012030837A

Description

本発明は高さ方向の収縮変形により、減圧状態における減容変形や軸方向の荷重による座屈変形を緩和、吸収する機能を発揮するようにした合成樹脂製丸形壜体に関する。
The present invention relates to a synthetic resin round casing that exhibits a function of mitigating and absorbing volume reduction deformation in a reduced pressure state and buckling deformation due to axial load by shrinkage deformation in the height direction.

従来から、ポリエチレンテレフタレート（以下ＰＥＴと記す。）樹脂製の二軸延伸ブロー成形壜体、所謂ＰＥＴボトルは、優れた透明性、機械強度、耐熱性、ガスバリア性等を有し、各種飲料用の容器として広く利用されている。また従来から、殺菌を必要とするたとえば果汁飲料、お茶等の内容液のＰＥＴボトルへの充填方法として、所謂、高温充填と呼ばれる方法があり、９０℃前後の温度で内容液を壜体に充填し、キャップをして密封後、冷却するものであり、壜体内がかなりの減圧状態となる。 Conventionally, polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded casings, so-called PET bottles, have excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc., and are used for various beverages. Widely used as a container. Conventionally, there is a so-called high-temperature filling method for filling a PET bottle with content liquids such as fruit juices and teas that require sterilization, and the liquid content is filled into the casing at a temperature of about 90 ° C. Then, the cap is sealed and then cooled, and the inside of the housing is in a considerably reduced pressure state.

このため、上記のような高温充填を伴う用途については、たとえば特許文献１中に記載があるように胴部に意図的に減圧により陥没状の変形が容易な領域である減圧吸収パネルを配設して、減圧時にこの減圧吸収パネルをさらに陥没状に変形させることにより、良好な外観を保持すると共に、減圧吸収パネル以外の部分で壜体としての剛性を確保できるようにし、壜体の搬送ライン、積重保管、自動販売機内等におけるトラブルがないようにする、所謂、減圧吸収機能を発揮するようにしている。 For this reason, for applications involving high-temperature filling as described above, for example, as described in Patent Document 1, a vacuum absorbing panel that is a region that can be easily deformed in a depressed state by depressurization is disposed on the body. The vacuum absorption panel is further deformed into a depressed shape at the time of depressurization, so that a good appearance can be maintained and rigidity as a casing can be secured in a portion other than the vacuum absorption panel. In addition, a so-called decompression absorption function is exhibited so as to prevent troubles in stacked storage, vending machines, and the like.

一方、特許文献２にあるように胴部に減圧吸収パネルを形成することなく、底部の底面壁の陥没状の変形により、減圧吸収機能を発揮するようにした合成樹脂製壜体も使用されている。
On the other hand, as disclosed in Patent Document 2, there is also used a synthetic resin casing which exhibits a reduced pressure absorption function by forming a depression in the bottom wall of the bottom without forming a reduced pressure absorption panel in the body portion. Yes.

特開平０８−０４８３２２号公報Japanese Patent Laid-Open No. 08-048322 特開２００７−２６９３９２号公報JP 2007-269392 A

ここで、減圧吸収パネルを配設した壜体では、減圧吸収パネル自体が撓み変形し易い部分であるので、胴部の剛性が低い、あるいは座屈強度が低い等の問題を有する。特に、１８０ｍｌ、２８０ｍｌ、５００ｍｌ等の小型の壜体では、胴部に減圧吸収パネルを形成するにしてもその面積が限定されるので、胴部の剛性や座屈強度と減圧吸収機能を十分に両立させることは困難である。そして、省資源や低コスト化の要請に沿って、壜体のさらなる薄肉化を進める必要がある場合には、この問題はさらに困難なものとなる。 Here, in the housing provided with the reduced pressure absorption panel, since the reduced pressure absorption panel itself is a portion that is easily bent and deformed, there is a problem that the rigidity of the body portion is low or the buckling strength is low. In particular, in the case of a small housing of 180 ml, 280 ml, 500 ml, etc., even if a vacuum absorbing panel is formed on the trunk, its area is limited, so the rigidity of the trunk and buckling strength and the vacuum absorbing function are sufficient. It is difficult to achieve both. This problem becomes even more difficult when it is necessary to further reduce the wall thickness in accordance with demands for resource saving and cost reduction.

一方、底部の底面壁の陥没状の変形により、減圧吸収機能を発揮するようにした合成樹脂製壜体では、減圧吸収パネルによる剛性や座屈強度の低下は避けることができるが、ここでも壜体の薄肉化が進展すると、底面壁における陥没変形が全周に亘って均一に進行することなく凹凸状に不均一に進行し、さらには底部の周縁部に配設される接地部にまで変形が進展し、外観が損なわれ、さらには壜体の自立性を損なう恐れがある。 On the other hand, in the case of a synthetic resin casing that exerts the reduced pressure absorption function due to the depression-like deformation of the bottom wall of the bottom, it is possible to avoid a decrease in rigidity and buckling strength due to the reduced pressure absorption panel. As the body becomes thinner, the depressed deformation in the bottom wall does not progress uniformly over the entire circumference, but progresses unevenly, and further deforms to the grounding part arranged at the peripheral edge of the bottom. Progresses, the appearance may be damaged, and the independence of the housing may be impaired.

そこで本発明は、上記した壜体の薄肉化への要請を背景とした減圧吸収機能と剛性や座屈強度の両立に係る問題を解消することを技術的課題とするものである。
In view of the above, the present invention has a technical problem to solve the problem relating to the compatibility between the reduced pressure absorption function and the rigidity and buckling strength against the background of the demand for thinning the casing.

上記課題を解決するための手段のうち、本発明の主たる構成は、

２軸延伸ブロー成形され、円筒状の胴部の上端にテーパー筒状の肩部を介して口筒部を起立設した合成樹脂製丸形壜体において、

肩部の下端部から胴部の上端部にかけての領域に周壁を段差状に拡径、若しくは縮径する幅が３ｍｍ以上の傾斜周壁を配設し、

該傾斜周壁と、該傾斜周壁の縮径側周縁に連結する縮径周壁部との開き角度を、座屈変形前の状態において４５〜１３５°の範囲とし、

該傾斜周壁の拡径側周縁から該傾斜周壁の傾斜面への角度で表した該傾斜周壁の傾斜角度を、座屈変形前の状態において０〜９０°の範囲とし、

壜体の中心軸方向に作用する押圧力による、傾斜周壁を起点とした周壁の全周に亘る反転状の座屈変形により、壜体の高さが短縮し減容変形が達成される構成とする、と云うものである。

Of the means for solving the above problems, the main configuration of the present invention is as follows.

In a synthetic resin round casing that is biaxially stretched and blown up, and a mouth tube portion is erected on the upper end of a cylindrical body portion via a tapered cylindrical shoulder portion,

In the region from the lower end of the shoulder portion to the upper end portion of the trunk portion, an inclined peripheral wall having a width of 3 mm or more for expanding or reducing the diameter of the peripheral wall in a stepped manner is disposed.

The opening angle between the inclined peripheral wall and the reduced diameter peripheral wall portion connected to the reduced diameter side periphery of the inclined peripheral wall is in the range of 45 to 135 ° in the state before buckling deformation,

The inclination angle of the inclined peripheral wall represented by an angle from the peripheral edge on the enlarged diameter side of the inclined peripheral wall to the inclined surface of the inclined peripheral wall is set to a range of 0 to 90 ° in a state before buckling deformation,

A structure in which volume reduction deformation is achieved by shortening the height of the casing by reversing buckling deformation over the entire circumference of the peripheral wall starting from the inclined peripheral wall due to the pressing force acting in the central axis direction of the casing It is said to be.

上記構成の基本的な技術思想は、周壁に予め陥没変形しやすい減圧吸収パネルを配設して減圧吸収機能を発揮させたのと同様に、周壁に予め壜体に中心軸方向に作用する押圧力による座屈変形の起点となる傾斜周壁を配設し、周壁の座屈変形を予め決めた領域で、外観を損なうことなくスムーズかつ均一に、また一定の変形態様で進行させて、謂わば、座屈変形吸収機能を発揮させようとした点にある。 The basic technical idea of the above configuration is that a pressure absorbing panel that is easily depressed and deformed in advance is provided on the peripheral wall to exert a pressure reducing absorption function in advance. An inclined peripheral wall that is the starting point of buckling deformation due to pressure is arranged, and the buckling deformation of the peripheral wall proceeds in a predetermined region smoothly and uniformly without deteriorating the appearance, and in a constant deformation mode, so-called It is in the point which tried to exhibit the buckling deformation absorption function.

そして、上記構成によれば、壜体の中心軸方向に沿って押圧力が作用すると、傾斜周壁が起点となり、傾斜周壁とこの傾斜周壁の両端部に連結する周壁との連結部を基部とした、周壁の反転状の座屈変形が進行し、この座屈変形により傾斜周壁の拡径側周縁に連結する周壁部（以下、拡径周壁部とする。）と、縮径側周縁に連結する周壁部（以下、縮径周壁部とする。）が、壜体の中心軸に沿って近接するように、さらには縮径周壁部の端部が拡径周壁部の端部に嵌入するように相対的に移動変位し、これにより壜体の高さが短縮し、壜体の減容変形を、外観を損なうことなく達成することができる。 And according to the said structure, when a pressing force acts along the central-axis direction of a housing, an inclination surrounding wall will become a starting point, and the connection part of the inclination surrounding wall and the surrounding wall connected to the both ends of this inclination surrounding wall was made into the base. The reversal buckling deformation of the peripheral wall proceeds, and by this buckling deformation, the peripheral wall part (hereinafter referred to as the enlarged peripheral wall part) connected to the enlarged peripheral edge of the inclined peripheral wall and the reduced peripheral part are connected. A peripheral wall portion (hereinafter referred to as a reduced diameter peripheral wall portion) is brought close along the central axis of the housing, and further, an end portion of the reduced diameter peripheral wall portion is fitted into an end portion of the enlarged diameter peripheral wall portion. Accordingly, the height of the housing is shortened, and volume reduction deformation of the housing can be achieved without impairing the appearance.

また、座屈変形の起点となる傾斜周壁を肩部の下端部から胴部の上端部かけての領域に配設することにより、比較的厚肉に形成され、テーパー筒状である肩部の中心軸方向の押圧力に対する高い形状保持性を利用して、上記した座屈変形をスムーズにかつ均一に進行させることが可能となる。
また、本願の壜体の形状は傾斜周壁を配設するため通常の単純な直線円筒状の胴部を有する壜体に比較し、少し変わった印象を与えるものであるが、傾斜周壁をテーパー筒状の肩部の近傍に配設することにより、外観的に調和のあるデザインとすることができる。さらに座屈変形が進行した際にも、外観形状に係る違和感を緩和することができる。 In addition, by arranging the inclined peripheral wall that is the starting point of buckling deformation in the region from the lower end of the shoulder to the upper end of the torso, the shoulder is formed in a relatively thick wall and has a tapered cylindrical shape. It is possible to smoothly and uniformly advance the buckling deformation described above by utilizing the high shape retention with respect to the pressing force in the central axis direction.
In addition, the shape of the housing of the present application gives a slightly different impression as compared with a housing having a normal straight cylindrical body because an inclined peripheral wall is provided. By arranging it in the vicinity of the shoulder portion, the design can be harmonized in appearance. Furthermore, even when buckling deformation progresses, the uncomfortable feeling related to the external shape can be alleviated.

そして、高温充填工程を要する用途等、壜体の内部が減圧状態となる用途では、上記した反転状の座屈変形に伴う壜体の減容変形により減圧吸収機能を発揮させることができる。
ここで、本発明の壜体では胴部に減圧吸収パネルを配設して、２種類の減圧吸収機構を併用することも可能であり、これにより十分に減圧吸収機能を発揮させることができ、小型で薄肉化すると云った厳しい条件下であっても、減圧吸収機能と剛性や座屈強度を高いレベルで両立させることが可能となる。 In applications where the inside of the casing is in a reduced pressure state, such as applications requiring a high-temperature filling step, the reduced pressure absorption function can be exhibited by the volume reduction deformation of the casing accompanying the reverse buckling deformation described above.
Here, in the housing of the present invention, it is possible to dispose a reduced pressure absorption panel in the body portion, and to use two types of reduced pressure absorption mechanisms in combination, thereby sufficiently exhibiting the reduced pressure absorption function, Even under severe conditions such as small size and thinning, it is possible to achieve both a reduced pressure absorption function and rigidity and buckling strength at a high level.

また、内容液を充填した壜体を箱詰めし、この箱を積重して保管する場合、さらには箱を積重した状態でトラック等で運搬する場合等、壜体の中心軸方向に大きな押圧状の荷重が作用する際にも、上記した傾斜周壁を起点とする周壁の反転状の座屈変形により、周壁の一部が歪に座屈変形してしまい外観を損ねるようなことを効果的に防ぐことができる。
さらに、座屈変形した状態では、壜体の高さ方向の短縮による減容変形に伴い、ヘッドスペースが減少し壜体内部が加圧状態となるので、座屈強度が向上し、苛酷な状態でも壜体の変形を防ぐことができる。 In addition, when the box filled with the contents liquid is boxed and the boxes are stacked and stored, or when the boxes are stacked and transported by a truck, etc., a large pressing in the central axis direction of the box Even when a load of a shape acts, it is effective that a part of the peripheral wall buckles and deforms due to the reverse buckling deformation of the peripheral wall starting from the inclined peripheral wall described above, and the appearance is impaired. Can be prevented.
Furthermore, in the buckled deformation state, the head space is reduced and the inside of the housing becomes pressurized due to volume reduction deformation due to shortening of the height of the housing, so that the buckling strength is improved and the harsh state But it can prevent deformation of the housing.

傾斜周壁を起点とした反転状の座屈変形では、周壁が反転する際、傾斜周壁は径方向に撓み変形する必要があり、幅が狭いとこの撓み変形が困難となり座屈変形がスムーズに進行しないが、上記構成により傾斜周壁の幅を３ｍｍ以上とすることにより、壜体内部の減圧状態による押圧力程度の作用であっても、撓み変形をスムーズに進行させて、座屈変形をスムーズに進行させることが可能となる。 In the reverse buckling deformation starting from the inclined peripheral wall, when the peripheral wall is reversed, the inclined peripheral wall needs to bend and deform in the radial direction. If the width is narrow, this bending deformation becomes difficult and the buckling deformation proceeds smoothly. However, by setting the width of the inclined peripheral wall to 3 mm or more with the above configuration, even if it is an action of a pressing force due to the reduced pressure state inside the housing, the bending deformation is smoothly advanced and the buckling deformation is smoothly performed. It is possible to proceed.

傾斜周壁と縮径周壁部との開き角度や、傾斜周壁の傾斜角度は、傾斜周壁を起点とした反転状の座屈変形のし易さの他にも、壜体の成形性、壜体の外観的なデザイン性等も考慮して決めることができるものであるが、傾斜周壁と縮径周壁部との開き角度については上記構成にあるように４５〜１３５°の範囲とすることが好ましく、また傾斜周壁の傾斜角度については０〜９０°の範囲とするのが好ましい。 The opening angle between the inclined peripheral wall and the reduced diameter peripheral wall and the inclined angle of the inclined peripheral wall are not only easy to reverse buckling deformation starting from the inclined peripheral wall, but also the formability of the casing, Although it can be determined in consideration of the appearance design etc., the opening angle between the inclined peripheral wall and the reduced diameter peripheral wall is preferably in the range of 45 to 135 ° as in the above configuration, The inclination angle of the inclined peripheral wall is preferably in the range of 0 to 90 °.

本発明のさらに他の構成は、上記主たる構成において、傾斜周壁の縮径側周縁に連結する周壁である縮径周壁部を、縮径側周縁に向けて縮径する構成とする、と云うものである。 Still another configuration of the present invention is such that, in the main configuration described above, the reduced diameter peripheral wall portion, which is a peripheral wall connected to the reduced diameter side periphery of the inclined peripheral wall, is reduced in diameter toward the reduced diameter side periphery. It is.

上記構成により、縮径周壁部を縮径側周縁に向けて縮径する構成とすることにより、この縮径周壁部に作用する押圧力の作用方向を壜体の中心軸方向に沿う方向から外れないようにすることができ、傾斜周壁を起点とした反転状の座屈変形に伴う、縮径周壁部と拡径周壁部の相対的な移動変位を中心軸に沿ってよりスムーズに進行させることができる。 With the above configuration, by reducing the diameter of the reduced diameter peripheral wall toward the reduced diameter side periphery, the action direction of the pressing force acting on the reduced diameter peripheral wall is deviated from the direction along the central axis direction of the housing. The relative displacement of the reduced-diameter peripheral wall and the expanded peripheral wall due to the reverse buckling deformation starting from the inclined peripheral wall can be more smoothly advanced along the central axis. Can do.

本発明のさらに他の構成は、上記主たる構成において、胴部の周壁に複数の周溝リブを形成する、と云うものである。 Still another configuration of the present invention is that, in the main configuration described above, a plurality of circumferential groove ribs are formed on the peripheral wall of the body portion.

上記構成により、胴部に複数の周溝リブを形成することにより、胴部の面剛性を大きくして高い形状保持性を付与すると共に、減圧時には壜体の高さ方向の短縮により減圧吸収機能を発揮させることができる丸形壜体を提供することができる。
By forming a plurality of circumferential groove ribs in the body, the above structure increases the surface rigidity of the body and gives it high shape retention. It is possible to provide a round casing capable of exhibiting the above.

本発明は、上記した構成となっているので、以下に示す効果を奏する。
本発明の主たる構成は、周壁に予め、壜体に中心軸方向に作用する押圧力による座屈変形の起点となる傾斜周壁を配設し、周壁の座屈変形を予め決めた領域で、外観を損なうことなくスムーズかつ均一に、また一定の変形態様で進行させて、謂わば、座屈変形吸収機能を発揮させようとしたものであり、傾斜周壁を起点とする反転状の座屈変形に伴う壜体の減容変形により、内部が減圧状態となる用途では、小型で薄肉の壜体であっても、壜体の剛性や座屈強度と減圧吸収機能を共に高いレベルで発揮させることができる。 Since the present invention has the above-described configuration, the following effects can be obtained.
The main configuration of the present invention is that an inclined peripheral wall that is a starting point of buckling deformation due to a pressing force acting on the casing in the direction of the central axis is disposed on the peripheral wall in advance, and the buckling deformation of the peripheral wall is determined in advance in the region. The so-called buckling deformation absorption function is achieved by smoothly and uniformly proceeding in a constant deformation mode without damaging the surface, and in reverse buckling deformation starting from the inclined peripheral wall. In applications where the internal volume is reduced due to the volume reduction deformation of the housing, even if it is a small and thin housing, both the rigidity and buckling strength of the housing and the reduced pressure absorption function can be exhibited at a high level. it can.

また内容液の充填した壜体を箱詰めし、この箱を積重して運搬するような苛酷な荷重が作用する用途であっても、減容変形によりヘッドスペースが減少し壜体内部が加圧状態となることも相俟って、上記座屈変形吸収機能により周壁の一部が歪に座屈変形してしまい外観を損ねるようなことを効果的に防ぐことができ、壜体の周壁の薄肉化をさらに進めることが可能となる。
In addition, even in applications where severe loads such as stacking and transporting the boxes filled with the contents liquid are applied, the head space is reduced due to volume reduction deformation, and the inside of the casing is pressurized. Combined with the state, it is possible to effectively prevent a part of the peripheral wall from being buckled and deformed by strain due to the above-described buckling deformation absorption function, It is possible to further reduce the thickness.

本発明の壜体の第１実施例を示す正面図である。It is a front view which shows 1st Example of the housing of this invention. 図１の壜体の傾斜周壁近傍の周壁の縦断面図である。It is a longitudinal cross-sectional view of the surrounding wall of the inclination surrounding wall vicinity of the housing of FIG. 図１の壜体の変形状態を示す正面図である。It is a front view which shows the deformation | transformation state of the housing of FIG. 図１の壜体の他の変形状態を示す正面図である。It is a front view which shows the other deformation | transformation state of the housing of FIG. （ａ）は図３の変形状態、（ｂ）は図４の変形状態における周壁の変形態様を図２と同様の縦断面図で示した説明図である。(A) is the deformation | transformation state of FIG. 3, (b) is explanatory drawing which showed the deformation | transformation aspect of the surrounding wall in the deformation state of FIG. 4 with the longitudinal cross-sectional view similar to FIG. 本発明の壜体の第２実施例を示す正面図である。It is a front view which shows 2nd Example of the housing of this invention. 図６の壜体の傾斜周壁近傍の周壁の縦断面図である。It is a longitudinal cross-sectional view of the surrounding wall of the inclination surrounding wall vicinity of the housing of FIG. 図６の壜体の変形状態を示す正面図である。It is a front view which shows the deformation | transformation state of the housing of FIG. 図６の壜体の他の変形状態を示す正面図である。It is a front view which shows the other deformation | transformation state of the housing of FIG. （ａ）は図８の変形状態、（ｂ）は図９の変形状態における周壁の変形態様を図７と同様の縦断面図で示した説明図である。(A) is the explanatory view which showed the deformation | transformation state of FIG. 8, and (b) was the longitudinal cross-sectional view similar to FIG. 7 which showed the deformation | transformation aspect of the surrounding wall in the deformation state of FIG.

以下、本発明の実施の形態を実施例に沿って図面を参照しながら説明する。
図１、２は本発明による合成樹脂製壜体の第１実施例を示すもので、図１は正面図、図２は傾斜周壁１１近傍の周壁の縦断面図である。
この壜体１は口筒部２、テーパー筒状の肩部３、円筒状の胴部４、底部５を有し、全高さが１００ｍｍ、最大径が６５ｍｍ、容量が１８０ｍｌのＰＥＴ樹脂製の２軸延伸ブロー成形品である。
なお、この種の形状の壜体では肩部３と胴部４の区分けは曖昧となるが、ここでは図１の右側に示したように肩部３と胴部４を区分けして以下説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
1 and 2 show a first embodiment of a synthetic resin casing according to the present invention, FIG. 1 is a front view, and FIG. 2 is a longitudinal sectional view of a peripheral wall in the vicinity of an inclined peripheral wall 11.
This housing 1 has a mouth tube part 2, a tapered cylindrical shoulder part 3, a cylindrical body part 4, and a bottom part 5, and is made of PET resin 2 having an overall height of 100 mm, a maximum diameter of 65 mm, and a capacity of 180 ml. It is an axial stretch blow molded product.
In this type of housing, the section between the shoulder 3 and the body 4 is ambiguous, but here the shoulder 3 and the body 4 are separated as shown on the right side of FIG. .

胴部４には横方向の面剛性と座屈強度を高くする手段の一つとして４ケの周溝リブ７を形成し、胴部４を高い形状保形性を有するものとしている。勿論、面剛性と座屈強度を高くするための手段は周溝リブ７に限定されるものではない。 The body portion 4 is formed with four circumferential groove ribs 7 as one means for increasing the lateral rigidity and buckling strength, and the body portion 4 has high shape retention. Of course, the means for increasing the surface rigidity and the buckling strength is not limited to the circumferential groove rib 7.

そして、この胴部４の上端部には周壁を段差状に下方に向かって拡径する傾斜周壁１１が配設されており、この傾斜周壁１１の上端部に相当する縮径側周縁１１ｂには縮径周壁部４ｂが連設し、下端部に相当する拡径側周縁１１ａには拡径周壁部４ａが連設している。
本実施例では、傾斜周壁１１の幅Ｗｐは６．５ｍｍ、傾斜周壁１１と縮径周壁部４ｂの開き角度Ｋａは１００°、拡径側周縁１１ａから傾斜周壁１１の傾斜面への角度で表した傾斜周壁１１の傾斜角度Ｋｂは２５°としている。
また、縮径周壁部４ｂは縮径側周縁１１ｂに向かって緩やかに縮径するように形成している。 An inclined peripheral wall 11 is provided at the upper end portion of the body portion 4 to expand the peripheral wall downward in a stepped shape. The reduced-diameter side peripheral edge 11b corresponding to the upper end portion of the inclined peripheral wall 11 includes The reduced diameter peripheral wall portion 4b is continuously provided, and the enlarged diameter peripheral wall portion 4a is continuously provided on the enlarged diameter side peripheral edge 11a corresponding to the lower end portion.
In this embodiment, the width Wp of the inclined peripheral wall 11 is 6.5 mm, the opening angle Ka between the inclined peripheral wall 11 and the reduced diameter peripheral wall portion 4b is 100 °, and the angle from the enlarged peripheral edge 11a to the inclined surface of the inclined peripheral wall 11 is expressed. The inclined angle Kb of the inclined peripheral wall 11 is 25 °.
Further, the reduced diameter peripheral wall portion 4b is formed so as to be gradually reduced in diameter toward the reduced diameter side peripheral edge 11b.

図３、４は壜体１に中心軸方向Ａｘに沿って押圧力が作用した際の壜体の変形状態を示すものである。この中、図３は高温充填法で９０℃前後の水を主体とした内容液を充填後、キャップ２１でシールし、室温に戻り壜体内部が減圧状態となった際の減容変形した状態を示すもので、ここでの減容変形は、傾斜周壁１１を介して上下に位置する縮径周壁部４ｂと拡径周壁部４ａが中心軸Ａｘに沿って相互に近接するように移動変位することにより、壜体１の高さが短縮し達成される。変形部分がテーパー筒状の肩部３の近傍にあることも相俟って、壜体１全体として外観が損なわれることもなく、小型の壜体に拘わらず減圧吸収機能が十分に達成される。 3 and 4 show the deformation state of the housing when a pressing force is applied to the housing 1 along the central axis direction Ax. FIG. 3 shows a state in which the volume is reduced and deformed when the content liquid mainly composed of water of about 90 ° C. is filled with a high temperature filling method and then sealed with a cap 21 and returned to room temperature and the inside of the housing is in a decompressed state. In this case, the volumetric deformation is displaced through the inclined peripheral wall 11 so that the reduced diameter peripheral wall part 4b and the enlarged diameter peripheral wall part 4a are close to each other along the central axis Ax. As a result, the height of the housing 1 is shortened and achieved. Combined with the fact that the deformed portion is in the vicinity of the tapered cylindrical shoulder 3, the overall appearance of the casing 1 is not impaired, and the reduced pressure absorption function is sufficiently achieved regardless of the small casing. .

ここで、減圧状態では壜体１の周壁全体に、周壁に垂直な方向に外力が作用するが、胴部４には面剛性を強化するための周溝リブ７を配設した構成のため、外力の横方向成分の力による円筒状の周壁の陥没状の変形は進行せず、外力の縦方向成分の力、すなわち中心軸Ａｘ方向に作用する押圧力により、壜体１の高さ方向の短縮変形が優先的に進行し減容変形が達成される。 Here, in the reduced pressure state, an external force acts on the entire peripheral wall of the housing 1 in a direction perpendicular to the peripheral wall, but the body portion 4 has a configuration in which peripheral groove ribs 7 for reinforcing the surface rigidity are disposed. Depression-like deformation of the cylindrical peripheral wall due to the force of the lateral component of the external force does not proceed, and the vertical component of the external force, that is, the pressing force acting in the direction of the central axis Ax, Shortening deformation proceeds preferentially and volume reduction deformation is achieved.

図４は、内容液を充填した壜体を箱詰めし、この箱を積重して保管する場合、さらには箱を積重した状態でトラックで運搬する場合等、壜体の中心軸方向にさらに苛酷な押圧力が作用するケースを想定し、壜体１に内容液を充填後キャップ２１でシールし、図中の白抜き矢印方向に大きな荷重を作用させた際の変形態様を示すものである。 FIG. 4 shows the case where the casing filled with the content liquid is packed in a box, and when the boxes are stacked and stored, or when the boxes are stacked and transported by a truck, the center axis of the casing is further increased. Assuming a case where severe pressing force is applied, the casing 1 is filled with the content liquid and sealed with a cap 21, and a deformation mode is shown when a large load is applied in the direction of the white arrow in the figure. .

このような苛酷な条件では、通常の胴部が直線円筒状の壜体では周壁の一部で座屈変形が発生してしまうが、本実施例の壜体１では前述した図３の変形状態から、縮径周壁部４ｂと拡径周壁部４ａが中心軸Ａｘに沿って相互に近接するような移動変位がさらに進行し、縮径周壁部４ｂの下端部が拡径周壁部４ａの上端部に嵌入するように変位した状態となる。
そして、このような変形状態であっても、壜体１全体として外観が損なわれることもなく、謂わば、座屈変形吸収機能とも云える機能が発揮される。 Under such severe conditions, in a case where a normal cylindrical body is a straight cylindrical case, buckling deformation occurs in a part of the peripheral wall. However, in the case 1 of the present embodiment, the deformation state shown in FIG. Therefore, the displacement of the diameter-reduced peripheral wall 4b and the diameter-expanded peripheral wall 4a further proceeds along the central axis Ax, and the lower end of the diameter-reduced peripheral wall 4b is the upper end of the diameter-enlarged peripheral wall 4a. It will be in the state displaced so that it may fit in.
And even if it is such a deformation | transformation state, the function as what is called a buckling deformation absorption function is exhibited, without impairing the external appearance as the housing 1 whole.

さらに、座屈変形した状態では、壜体１の高さ方向の短縮による減容変形に伴い、ヘッドスペースが減少し壜体１内部が加圧状態となるので、座屈強度が向上し、さらに苛酷な状態でも壜体１の変形を防ぐことができる。
なお、本実施例の形状は、通常の直線円筒状の胴部を有する壜体に比較し、少し変わった印象を与えるものであるが、傾斜周壁１１をテーパー筒状の肩部３の近傍に配設することにより、外観的に調和のあるデザインとすることができ、図３、４に示される変形後の形状であっても外観形状に係る違和感を緩和することができるものとしている。 Furthermore, in the buckled and deformed state, the head space is reduced and the inside of the housing 1 is in a pressurized state due to volume reduction deformation due to shortening of the height direction of the housing 1. The deformation of the housing 1 can be prevented even in a harsh state.
The shape of the present embodiment gives a slightly different impression as compared with a case having a normal straight cylindrical body, but the inclined peripheral wall 11 is located in the vicinity of the tapered cylindrical shoulder 3. By arranging it, it is possible to make the design harmonious in appearance, and even the deformed shape shown in FIGS. 3 and 4 can alleviate the uncomfortable feeling related to the external shape.

図５は、図３、４を参照して説明した変形状態での周壁の変形態様を図２と同様の縦断面図で示した説明図であり、図５（ａ）は図３の変形状態、（ｂ）は図４の変形状態に相当し、中心軸Ａｘ方向の押圧力による変形は、変形前の図２の状態から、図５（ａ）の状態へ、さらに図５（ｂ）へと進行する。
そしてこれらの図から分かるように、傾斜周壁１１と、上部に連結する縮径周壁部４ｂあるいは下部に連結する拡径周壁部４ａとの連結部に相当する縮径側周縁１１ｂと拡径側周縁１１ａを基部とした、縮径周壁部４ｂ、傾斜周壁１１、拡径周壁部４ａから構成される周壁部分の反転状の座屈変形により、縮径周壁部４ｂが縮径側周縁１１ｂに向かって緩やかに縮径していることも相俟って、前述した縮径周壁部４ｂと拡径周壁部４ａが中心軸Ａｘに沿って相互に近接するような、さらには縮径周壁部４ｂの下端部が拡径周壁部４ａの上端部に嵌入するような移動変位をスムーズに進行させることができる。 FIG. 5 is an explanatory view showing a deformation mode of the peripheral wall in the deformation state described with reference to FIGS. 3 and 4 in a vertical sectional view similar to FIG. 2, and FIG. 5 (a) is a deformation state of FIG. , (B) corresponds to the deformation state of FIG. 4, and the deformation due to the pressing force in the direction of the central axis Ax is changed from the state of FIG. 2 before the deformation to the state of FIG. 5 (a) and further to FIG. And proceed.
As can be seen from these drawings, the reduced diameter side peripheral edge 11b and the expanded diameter side peripheral edge corresponding to the connecting portion between the inclined peripheral wall 11 and the reduced diameter peripheral wall portion 4b connected to the upper portion or the enlarged diameter peripheral wall portion 4a connected to the lower portion. Due to the reverse buckling deformation of the peripheral wall portion composed of the reduced diameter peripheral wall portion 4b, the inclined peripheral wall 11, and the enlarged diameter peripheral wall portion 4a, the reduced diameter peripheral wall portion 4b is directed toward the reduced diameter side peripheral edge 11b. Combined with the gradual reduction in diameter, the above-mentioned reduced diameter peripheral wall 4b and the enlarged diameter peripheral wall 4a are close to each other along the central axis Ax. It is possible to smoothly advance the movement displacement such that the portion fits into the upper end portion of the enlarged diameter peripheral wall portion 4a.

ここで、傾斜周壁１１は反転状の座屈変形の、謂わば、起点となる部位であるが、座屈変形の過程で傾斜周壁１１は例えば図５（ａ）に示されるように湾曲状に変形、あるいはＳ字状に撓み変形するため、この種の撓み変形がスムーズに達成できるように、傾斜周壁１１幅Ｗｐはその点を考慮して設定する必要がある。そして、減圧時の比較的小さな押圧力を考慮すると、この幅Ｗｐは３ｍｍ以上とするのが好ましい。また、開き角度Ｋａや傾斜角度Ｋｂも座屈変形のし易さを決める重要な要素である。 Here, the inclined peripheral wall 11 is a so-called starting point of the reverse buckling deformation, but in the buckling deformation process, the inclined peripheral wall 11 is curved, for example, as shown in FIG. Since it is deformed or deformed into an S shape, the width Wp of the inclined peripheral wall 11 needs to be set in consideration of this point so that this kind of deformation can be achieved smoothly. In consideration of a relatively small pressing force during decompression, the width Wp is preferably set to 3 mm or more. The opening angle Ka and the inclination angle Kb are also important factors that determine the ease of buckling deformation.

次に、図６、７は、本発明による合成樹脂製壜体の第２実施例を示すもので、図６は正面図、図７は傾斜周壁１１近傍の周壁の縦断面図である。
この壜体１は図１に示される第１実施例の壜体と同様に口筒部２、テーパー筒状の肩部３、円筒状の胴部４、底部５を有し、全高さが１００ｍｍ、最大径が６５ｍｍ、容量が１８０ｍｌのＰＥＴ樹脂製の２軸延伸ブロー成形品である。
なお、ここでも図６の右側に示したように肩部３と胴部４を区分けして以下説明する。 Next, FIGS. 6 and 7 show a second embodiment of the synthetic resin casing according to the present invention, FIG. 6 is a front view, and FIG. 7 is a longitudinal sectional view of the peripheral wall in the vicinity of the inclined peripheral wall 11.
This casing 1 has a mouth tube part 2, a tapered cylindrical shoulder part 3, a cylindrical body part 4 and a bottom part 5 as in the case of the first embodiment shown in FIG. A biaxial stretch blow molded product made of PET resin having a maximum diameter of 65 mm and a capacity of 180 ml.
In addition, here, as shown on the right side of FIG.

本実施例の壜体の第２実施例の壜体に対する主たる特徴は、下方に向かって縮径する傾斜周壁１１を配設した点にあり、この傾斜周壁１１の上端部に相当する拡径側周縁１１ａには拡径周壁部４ａが連設し、下端部に相当する縮径側周縁１１ｂには縮径周壁部４ｂが連設している。
なお、本実施例では、傾斜周壁１１の幅Ｗｐは６．５ｍｍ、傾斜周壁１１と縮径周壁部４ｂの開き角度Ｋａは９０°、拡径側周縁１１ａから傾斜周壁１１の傾斜面への角度で表した傾斜周壁１１の傾斜角度Ｋｂは２５°としている。
また、縮径周壁部４ｂは縮径側周縁１１ｂに向かって縮径するように形成されている。
また、縮径側周縁１１ｂより下方で、胴部４はかなりの高さ範囲で縮径周壁部４ｂに連続するようにテーパー状に形成されており、４ケの周溝リブ７が配設されている。 The main features for the bottle of the second embodiment of the bottle of the present embodiment is in the point which is disposed an inclined peripheral wall 11 which decreases in diameter downward, enlarged side corresponding to the upper end of the inclined wall 11 An enlarged diameter peripheral wall portion 4a is connected to the peripheral edge 11a, and a reduced diameter peripheral wall portion 4b is connected to the reduced diameter side peripheral edge 11b corresponding to the lower end portion.
In the present embodiment, the width Wp of the inclined peripheral wall 11 is 6.5 mm, the opening angle Ka between the inclined peripheral wall 11 and the reduced diameter peripheral wall portion 4b is 90 °, and the angle from the enlarged peripheral edge 11a to the inclined surface of the inclined peripheral wall 11 The inclination angle Kb of the inclined peripheral wall 11 represented by is set to 25 °.
Further, the reduced diameter peripheral wall portion 4b is formed to reduce the diameter toward the reduced diameter side peripheral edge 11b.
Further, below the reduced diameter side peripheral edge 11b, the body part 4 is formed in a tapered shape so as to continue to the reduced diameter peripheral wall part 4b in a considerable height range, and four circumferential groove ribs 7 are provided. ing.

図８、９は壜体１に中心軸方向Ａｘに押圧力が作用した際の壜体の変形状態を示すもので、これらは第１実施例の壜体１の図３、４に示した変形状態に相当し、図８は壜体１内部が減圧状態となった際の減容変形した状態を示し、図９は壜体１に内容液を充填後キャップ２１でシールし、図中の白抜き矢印方向に大きな荷重を作用した際の変形態様を示すものである。 8 and 9 show the deformation state of the housing when the pressing force is applied to the housing 1 in the central axis direction Ax. These are the deformations of the housing 1 of the first embodiment shown in FIGS. 8 shows a state where the volume of the housing 1 is reduced and deformed when the inside of the housing 1 is in a reduced pressure state. FIG. 9 shows a state in which the housing 1 is filled with the content liquid and is sealed with a cap 21. The deformation | transformation aspect at the time of applying a big load to the extraction arrow direction is shown.

また、図１０は、図８、９の変形状態での周壁の変形態様を図７と同様の縦断面図で示した説明図であり、図１０（ａ）は図８の変形状態、図１０（ｂ）は図９の変形状態に相当し、中心軸Ａｘ方向の押圧力による変形は、変形前の図７の状態から、図１０（ａ）の状態へ、さらに図１０（ｂ）の状態へと進行する。 10 is an explanatory view showing a deformation mode of the peripheral wall in the deformation state of FIGS. 8 and 9 in a vertical sectional view similar to FIG. 7, and FIG. 10 (a) is a deformation state of FIG. (B) corresponds to the deformed state of FIG. 9, and the deformation due to the pressing force in the direction of the central axis Ax changes from the state of FIG. 7 before the deformation to the state of FIG. 10 (a) and further to the state of FIG. 10 (b). Proceed to.

そして、本実施例の下方に縮径する傾斜周壁１１を配設した壜体１では、傾斜周壁１１と、上部に連結する拡径周壁部４ａあるいは下部に連結する縮径周壁部４ｂとの連結部に相当する拡径側周縁１１ａと縮径側周縁１１ｂを基部とした、拡径周壁部４ａ、傾斜周壁１１、縮径周壁部４ｂから構成される周壁部分の反転状の座屈変形により、拡径周壁部４ａと縮径周壁部４ｂとが中心軸Ａｘに沿って相互に近接するような、さらには縮径周壁部４ｂの上端部が拡径周壁部４ａの下端部に嵌入するような移動変位をスムーズに進行させることができ、この移動変位により第１実施例の壜体と同様に減圧吸収機能や座屈変形吸収機能を十分に発揮させることができる。 And in the housing 1 which arrange | positioned the inclination surrounding wall 11 diameter-reduced below the present Example, the connection with the inclination surrounding wall 11 and the diameter expansion surrounding wall part 4a connected to the upper part, or the diameter reduction surrounding wall part 4b connected to the lower part Based on the reverse buckling deformation of the peripheral wall portion composed of the enlarged peripheral wall portion 4a, the inclined peripheral wall portion 11 and the reduced diameter peripheral wall portion 4b, with the enlarged diameter side peripheral edge 11a and the reduced diameter side peripheral edge 11b as the base. The enlarged diameter peripheral wall portion 4a and the reduced diameter peripheral wall portion 4b are close to each other along the central axis Ax, and the upper end portion of the reduced diameter peripheral wall portion 4b is fitted into the lower end portion of the enlarged diameter peripheral wall portion 4a. The movement displacement can be made to proceed smoothly, and the reduced pressure absorption function and the buckling deformation absorption function can be sufficiently exhibited by this movement displacement in the same manner as the case of the first embodiment.

以上、実施例に沿って本発明の構成とその作用効果について説明したが、本発明の実施の形態は上記実施例に限定されるものではない。
上記実施例は１８０ｍｌの小型の壜体についてのものであったが、本願の減容変形機構はさらに小型、あるいは大型の壜体についても適用することができる。 As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.
Although the above embodiment is for a 180 ml small casing, the volume reduction deformation mechanism of the present application can be applied to a smaller or larger casing.

また、傾斜周壁の幅や配設角度を含めた形状は、幅Ｗｐを３ｍｍ以上とする、開き角度Ｋａを４５〜１３５°の範囲とする、傾斜角度Ｋｂを０〜９０°の範囲とする、と云う範疇のなかで、座屈変形の起点として作用効果の他に、壜体の成形性、壜体の外観的なデザイン性等も考慮して決めることができるものである。
また、上記実施例では胴部に周溝を複数配設し、横方向の面剛性や座屈強度を大きくした壜体としたが、胴部に減圧吸収パネルを配設した構成とすることにより、本願の傾斜周壁を起点とした減圧吸収機構と併用し、十分に減圧吸収機能を発揮させることができ、小型で薄肉化すると云った厳しい条件下であっても、減圧吸収機能と剛性や座屈強度を高いレベルで両立させることが可能となる。
In addition, the shape including the width and arrangement angle of the inclined peripheral wall has a width Wp of 3 mm or more, an opening angle Ka in the range of 45 to 135 °, and an inclination angle Kb in the range of 0 to 90 °. In this category, it can be determined in consideration of the formability of the housing, the external design of the housing, etc. in addition to the function and effect as the starting point of the buckling deformation.
Also, in the above embodiment, a plurality of circumferential grooves are provided in the body portion, and the housing has increased lateral surface rigidity and buckling strength. However, by adopting a configuration in which a reduced pressure absorption panel is provided in the body portion. In combination with the vacuum absorption mechanism starting from the inclined peripheral wall of the present application, the vacuum absorption function can be sufficiently exerted, and even under severe conditions such as being small and thin, It becomes possible to make the bending strength compatible at a high level.

本発明の合成樹脂製壜体は、周壁に予め座屈変形の起点となる傾斜周壁を配設し、周壁の座屈変形を予め決めた領域で、外観を損なうことなくスムーズかつ均一に、また一定の変形態様で進行させて減容変形を達成できるものであり、高温充填を必要とする用途、運搬等で苛酷な荷重の作用が予想される用途での幅広い利用展開が期待される。
The synthetic resin casing of the present invention is provided with an inclined peripheral wall that is a starting point of buckling deformation in advance on the peripheral wall, and in a region where the buckling deformation of the peripheral wall is determined in advance, smoothly and uniformly without impairing the appearance. It is possible to achieve volume reduction deformation by proceeding in a certain deformation mode, and is expected to be widely used in applications that require high-temperature filling and applications that are expected to be subjected to severe loads during transportation and the like.

１；壜体
２；口筒部
３；肩部
４；胴部
４ａ；拡径周壁部
４ｂ；縮径周壁部
５；底部
７；周溝リブ
１１；傾斜周壁
１１ａ；拡径側周縁
１１ｂ；縮径側周縁
２１；キャップ
Ａｘ；中心軸
Ｋａ；開き角度
Ｋｂ；傾斜角度
Ｗｐ；幅 DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Body part 4a; Expanded-diameter peripheral wall part 4b; Reduced-diameter peripheral wall part 5; Bottom part 7; Circumferential groove rib 11; Inclined peripheral wall 11a; Radial side edge 21; Cap Ax; Center axis Ka; Opening angle Kb; Inclination angle Wp;

Claims

２軸延伸ブロー成形され、円筒状の胴部(4)の上端にテーパー筒状の肩部(3)を介して口筒部(2)を起立設した合成樹脂製丸形壜体であり、

前記肩部(3)の下端部から胴部(4)の上端部にかけての領域に周壁を段差状に拡径、若しくは縮径する幅(Wp)が３ｍｍ以上の傾斜周壁(11)を配設し、

該傾斜周壁(11)と、該傾斜周壁(11)の縮径側周縁(11b)に連結する縮径周壁部(4b)との開き角度(Ka)を、座屈変形前の状態において４５〜１３５°の範囲とし、

該傾斜周壁(11)の拡径側周縁(11a)から該傾斜周壁(11)の傾斜面への角度で表した該傾斜周壁(11)の傾斜角度(Kb)を、座屈変形前の状態において０〜９０°の範囲とし、

壜体の中心軸(Ax)方向に作用する押圧力による、前記傾斜周壁(11)を起点とした周壁の全周に亘る反転状の座屈変形により、壜体の高さが短縮し減容変形が達成される構成とした合成樹脂製丸形壜体。

A synthetic resin round casing that is biaxially stretched and blown up and has a cylindrical tube (2) upright via a tapered cylindrical shoulder (3) at the upper end of a cylindrical barrel (4).

An inclined peripheral wall (11) having a width (Wp) of 3 mm or more is provided in the region extending from the lower end of the shoulder (3) to the upper end of the body (4). And

The opening angle (Ka) between the inclined peripheral wall (11) and the reduced diameter peripheral wall portion (4b) connected to the reduced diameter side periphery (11b) of the inclined peripheral wall (11) is 45 to 45 in a state before buckling deformation. A range of 135 °,

The inclination angle (Kb) of the inclined peripheral wall (11) represented by the angle from the peripheral edge (11a) on the expanded diameter side of the inclined peripheral wall (11) to the inclined surface of the inclined peripheral wall (11) is a state before buckling deformation. In the range of 0-90 °,

Due to the reverse buckling deformation over the entire circumference of the peripheral wall starting from the inclined peripheral wall (11) due to the pressing force acting in the central axis (Ax) direction of the casing, the height of the casing is shortened and the volume is reduced. Synthetic resin round frame with a structure that achieves deformation.

傾斜周壁(11)の縮径側周縁(11b)に連結する周壁である縮径周壁部(4b)を、前記縮径側周縁(11b)に向けて縮径する構成とした請求項１記載の合成樹脂製丸形壜体。

Reduced-diameter circumferential wall portion is a peripheral wall that connects the reduced diameter side rim (11b) of the inclined wall (11) and (4b), according to claim 1 Symbol placement has a configuration whose diameter decreases toward the reduced diameter side rim (11b) Synthetic resin round frame.

胴部(4)の周壁に複数の周溝リブ(7)を形成した請求項１または２記載の合成樹脂製丸形壜体。

Barrel (4) a plurality of circumferential grooves ribs (7) was formed according to claim 1 or 2 Symbol placement synthetic resin round bottle of the peripheral wall of the.