JP2015127249A - Synthetic resin round bottle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable depressed deformation of a bottom wall face of a bottom part accompanying increase in a decompression degree without damaging self-supporting performance of a bottle body and exhibit sufficient decompression absorbing performance by the entire bottle body including the depressed deformation of the bottom part, in a synthetic resin round bottle body in which a decompression absorbing panel is not arranged and surface stiffness of a peripheral wall of a barrel part is set large.SOLUTION: The round bottle body is formed by biaxial stretch blow molding, and a plurality of peripheral grooves are arranged on the peripheral wall of the bottle body so as to enable elastically compressed deformation in the longitudinal direction by action of pressing force in the longitudinal direction along with increase in the decompression degree within the bottle body. On the bottom face of the bottom part, a projection functioning as a ground part is protruded downward on the inner side of a peripheral edge part, and a depressed recess is disposed in a central part. Along with increase in the decompression degree within the bottle body, the height dimension of the barrel part is shortened accompanying compressed deformation of the peripheral grooves, and the decompression absorbing function is exhibited caused by depressed upward deformation of the depressed recess. Instead of the projection, the peripheral edge part functions as the ground part.

Description

本発明は、内部が減圧状態になった際に、この減圧を胴部に減圧吸収パネルを配設することなく吸収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 absorbs this reduced pressure without disposing a reduced pressure absorption panel in the body when the inside is in a reduced pressure state.

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、所謂、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と云う、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 so-called decompression absorption panel, which is an area where the body portion is easily deformed in a depressed state by intentional decompression, is used. By disposing and deforming this vacuum absorption panel into a depressed shape at the time of decompression, while maintaining a good appearance, it is possible to secure rigidity as a housing in parts other than the vacuum absorption panel, and transport the housing A so-called decompression absorption function is exhibited so as to prevent troubles in the line, stacked storage, vending machines and the like.

一方、特許文献２に記載が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があり、このような壜体では胴部の外観を平滑にできるデザイン的な利点があり、シュリンクラベルを外装する場合も、ラベルでの皺の発生や不均一な伸縮を抑制することができ、スッキリした外観を呈するようにすることができる。   On the other hand, as described in Patent Document 2, there is a synthetic resin casing made to exhibit a reduced pressure absorption function by a depression-like deformation of the bottom wall of the bottom without forming a reduced pressure absorption panel in the body portion, Such a housing has a design advantage that can smooth the appearance of the body, and even when a shrink label is installed, it can suppress the generation of wrinkles and uneven expansion and contraction on the label, and it has a clean appearance. It can be made to present.

ここで、図９に示す壜体１０１は、底部１０５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の一例であり、（ａ）は正面図、（ｂ）は底面図である。
この壜体１０１では、胴部１０４の周壁に複数の周溝リブ１０７を配設し、これにより胴部１０４の周壁の面剛性を大きくし、内部が減圧になった際には、胴部１０４の形状は保持しながら、底部１０５の陥没凹部１１５のさらなる陥没状の変形（図９（ａ）中の矢印方向への変形）により、減圧吸収機能を発揮するようにしている。 Here, the casing 101 shown in FIG. 9 is an example of a synthetic resin casing that exhibits a reduced pressure absorption function due to the depression-like deformation of the bottom wall of the bottom 105, (a) is a front view, (B) is a bottom view.
In this casing 101, a plurality of circumferential groove ribs 107 are arranged on the peripheral wall of the trunk portion 104, thereby increasing the surface rigidity of the peripheral wall of the trunk portion 104, and when the internal pressure is reduced, the trunk portion 104 is provided. While maintaining this shape, the reduced pressure absorbing function is exhibited by further deformed deformation (deformation in the direction of the arrow in FIG. 9A) of the depressed recess 115 of the bottom 105.

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

しかしながら、図９に示したようなタイプの壜体１０１においても、省資源やコスト削減のために、壜体の薄肉化が求められており、薄肉化が進展すると、減圧時における陥没凹部１１５のさらなる陥没状の変形の進行に伴い、この陥没部１１５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、図９（ｂ）の底面図に示されるように、径方向や周方向にいくつもの折れ目Ｖを形成しながら、凹凸状に不均一に進行し、底部１０５の周縁部に配設され接地部としての機能を発揮する周縁部１１２にまで折れ目Ｖが進行して、外観を損ない、さらには壜体１０１の自立性を損なう結果となってしまうと云う問題がある。   However, the housing 101 of the type shown in FIG. 9 is also required to reduce the thickness of the housing in order to save resources and reduce costs. As the further depression-like deformation progresses, the depression deformation in the depression 115 does not progress uniformly over the entire circumference, and as shown in the bottom view of FIG. While forming a number of folds V, the folds V are unevenly advanced, and the folds V are advanced to a peripheral portion 112 that is disposed on the peripheral portion of the bottom portion 105 and functions as a grounding portion. There is a problem that the result is that the self-supporting property of the casing 101 is impaired.

また、図９に示したようなタイプの壜体１０１は前述したように胴部１０４の周壁に複数の周溝リブ１０７を配設し、これにより胴部１０４の周壁の面剛性を大きくしており、胴部１０４の周壁の陥没状の変形による減圧吸収機能が期待できないため、高温充填を要する用途等で減圧度が大きくなった場合、底面壁の陥没状の変形による減圧吸収機能だけでは不十分となり、たとえばテーパー筒状の肩部１０３から胴部１０４の上端部にかけての部分が局部的に陥没変形すると云う問題もある。   Further, as described above, the casing 101 of the type shown in FIG. 9 is provided with a plurality of circumferential groove ribs 107 on the peripheral wall of the trunk portion 104, thereby increasing the surface rigidity of the peripheral wall of the trunk portion 104. In addition, since the decompression absorption function due to the depression-like deformation of the peripheral wall of the body portion 104 cannot be expected, when the degree of decompression increases in applications that require high-temperature filling, the decompression absorption function due to the depression-like deformation of the bottom wall is not sufficient. For example, there is a problem that a portion from the tapered cylindrical shoulder portion 103 to the upper end portion of the body portion 104 is locally depressed and deformed.

そこで本発明は、上記した従来技術における問題点を解消すべく、減圧吸収パネルを配設しないで、胴部の周壁の面剛性を大きくした合成樹脂製丸形壜体において、減圧度の上昇に伴う底部の底壁面の陥没変形を壜体の自立性を損なうことなく可能な構成とし、この底壁面の陥没変形を含めて壜体全体として十分に減圧吸収機能を発揮することが可能な壜体構造を創出することを課題とする。   Therefore, in order to solve the above-described problems in the prior art, the present invention increases the degree of pressure reduction in a synthetic resin round casing with increased surface rigidity of the peripheral wall of the trunk without providing a vacuum absorbing panel. A structure that allows the bottom wall of the bottom to be depressed and deformed without impairing the independence of the frame, and that can fully exhibit the vacuum absorption function as a whole, including the deformation of the bottom wall. The challenge is to create a structure.

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を有する合成樹脂製丸形壜体において、
胴部の周壁には周溝を複数配設し、
底部の底面の、周縁部の内側には底面壁を周縁部より下方に突出させて形成した接地部としての機能を発揮する突条を配設し、中央部には突条の内側を基端として、縮径状に形成された段部を介して底面壁を上方、内部方向に陥没させて形成した陥没凹部を配設し、壜体内部の減圧度の上昇に伴い、周溝の溝幅の圧縮状の変形に伴う胴部の高さ寸法の短縮化と、周突条の伸展するような変形による、突条から陥没凹部にかけての底面壁の陥没状の上方変位により減圧吸収機能が発揮されると共に、突条の替わりに周縁部が接地部としての機能を発揮する構成とする、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 having a biaxial stretch blow molded cylindrical body,
A plurality of circumferential grooves are arranged on the peripheral wall of the trunk,
On the bottom surface of the bottom portion, a ridge that functions as a grounding portion formed by projecting the bottom wall downward from the rim portion is arranged on the inner side of the peripheral portion, and the inner side of the ridge is the base end in the central portion. As shown in the figure, a concave recess formed by recessing the bottom wall upward and inward through a stepped portion having a reduced diameter is provided, and the groove width of the circumferential groove is increased as the degree of decompression inside the housing increases. Decompression of the bottom wall of the bottom wall from the ridge to the depressed recess due to the shortening of the body height due to the compression deformation of the shell and the deformation that the peripheral ridge extends, exerts a reduced pressure absorption function At the same time, instead of the ridges, the peripheral portion exhibits a function as a grounding portion.

上記構成の壜体の従来にない特徴は、
底部の底面において周縁部と中央部に配設される陥没凹部の間に突条を下方に突出させて配設すると共に、胴部の周壁に配設する周溝を壜体内部の減圧度の上昇に伴い、縦方向に圧縮状の変形が可能な構成とし、壜体内部の減圧度が上昇した際に、底面壁の陥没変形と周溝の圧縮状の変形による胴部の高さ寸法の短縮化が相俟って十分な減圧吸収機能が十分に発揮されると共に、周縁部が突条に替わって接地部としての機能を発揮して壜体の自立性が確実に維持されるようにした点にある。 An unprecedented feature of the above-structured housing is
At the bottom surface of the bottom portion, a protrusion is provided to project downward between the recessed portion provided at the peripheral portion and the central portion, and the circumferential groove provided on the peripheral wall of the trunk portion is provided with a degree of decompression inside the housing. The structure is capable of compressive deformation in the vertical direction as it rises, and when the degree of decompression inside the housing is increased, the height of the body is reduced due to the depression deformation of the bottom wall and the compression deformation of the peripheral groove. Combined with shortening, sufficient decompression absorption function is fully demonstrated, and the peripheral part is replaced with a ridge to function as a grounding part so that the independence of the housing is reliably maintained It is in the point.

ここで、突条から陥没凹部にかけての底面壁部分（以下、陥没変形部と記す場合がある。）が減圧により上方変位する前は、突条が接地部としての機能を発揮する構成としているが、減圧状態となり陥没変形部が減圧により上方変位し、突条の突出した先端部が周縁部よりも上方に変位した状態では、周縁部が接地部としての機能を発揮する。このように、接地部の機能を突条と周縁部で分担させることにより、減圧時に、壜体の自立性を損なうことなく突条を十分に上方変位可能な構成とすることができる。また、突条から陥没凹部にかけての底面壁の陥没状の上方変位、すなわち減圧吸収機能は、突条の伸展変形により得られるものである。   Here, before the bottom wall portion from the ridge to the depressed recess (hereinafter sometimes referred to as a depressed deformed portion) is displaced upward due to reduced pressure, the ridge is configured to exhibit the function as a grounding portion. In the state in which the depressed deformed portion is displaced upward due to the reduced pressure and the tip portion from which the protrusion protrudes is displaced above the peripheral portion, the peripheral portion functions as a grounding portion. In this way, by sharing the function of the grounding portion between the ridge and the peripheral portion, the ridge can be sufficiently displaced upward without deteriorating the independence of the housing during decompression. Further, the depression-like upward displacement of the bottom wall from the ridge to the depression recess, that is, the reduced pressure absorption function is obtained by the extension deformation of the ridge.

また、底部による減圧吸収機能は底面壁を薄肉化することにより大きくすることが可能であるものの、他方、薄肉化すると高温充填工程での、所謂、底落ちの問題や、底部の接地機能の低下の問題があるため、底部だけで必要とされる減圧吸収機能を発揮させることが困難な場合もあるが、上記構成によれば、不足分を胴部の高さ寸法の短縮化による減圧吸収機能で補完することが可能となる。
見方を変えると、この胴部の高さ寸法の短縮化による補完機能により、底部の肉厚を含めた形状設計の自由度を大きくすることができると云える。 In addition, the vacuum absorption function at the bottom can be increased by thinning the bottom wall, but on the other hand, when the wall is thinned, the so-called bottom-down problem and the bottom grounding function in the high-temperature filling process are reduced. In some cases, it may be difficult to demonstrate the vacuum absorption function required only at the bottom, but according to the above configuration, the vacuum absorption function is achieved by shortening the height of the trunk. It becomes possible to supplement with.
From a different perspective, it can be said that the degree of freedom in shape design including the thickness of the bottom can be increased by the complementary function by shortening the height of the body.

なお、周溝の溝幅、溝深さ等を含む縦断面形状、そして配設位置や配設数等は、外観デザイン、必要とされる減圧吸収機能の他に、周溝による胴部の面剛性に係る補強効果、周溝の配設による縦方向の座屈強度の低下の程度を考慮して適宜に設定することができる。もちろん、配設数を多くすればそれだけ減圧吸収機能を発揮させることができる。   In addition, the longitudinal cross-sectional shape including the groove width, groove depth, etc. of the circumferential groove, the arrangement position and the number of arrangements, etc. are the appearance design, the required vacuum absorption function, the surface of the body part by the circumferential groove It can be set appropriately in consideration of the reinforcing effect related to rigidity and the degree of reduction in the buckling strength in the vertical direction due to the arrangement of the circumferential groove. Of course, if the number of arrangements is increased, the reduced pressure absorption function can be exhibited.

本発明の他の構成は、上記主たる構成において、周溝は、壜体内部の減圧度の上昇に伴う縦方向の押圧力の作用により縦方向に弾性的に圧縮状の変形が可能に周壁を縦断面でみて台形状に屈曲して形成した構成とし、周溝の溝深さを２ｍｍ以上とする、と云うものである。   According to another configuration of the present invention, in the main configuration described above, the peripheral groove has a peripheral wall that can be elastically compressed and deformed in the vertical direction by the action of the vertical pressing force accompanying an increase in the degree of decompression inside the housing. The structure is formed by bending in a trapezoidal shape when viewed in the longitudinal section, and the groove depth of the circumferential groove is 2 mm or more.

本発明のさらに他の構成は、上記主たる構成において、周溝の溝側壁の水平方向からの傾斜角度を４５°以下とする、と云うものである。
なお、傾斜角度は０°以上である。 Still another configuration of the present invention is that, in the main configuration described above, an inclination angle of the groove side wall of the circumferential groove from the horizontal direction is set to 45 ° or less.
The inclination angle is 0 ° or more.

縦方向の押圧力の作用による周溝の縦方向の、弾性的な圧縮状の変形のし易さは、周壁の肉厚や周溝の縦断面形状（溝幅、溝深さ、溝側壁の水平方向からの傾斜角度等）により適宜設定することができるが、上記構成により溝深さを２ｍｍ以上とすることにより、また溝側壁の水平方向からの傾斜角度を４５°以下とすることにより、壜体内での減圧度の進行により周溝を縦方向にスムーズに圧縮状に変形させることができ、減圧吸収機能をスムーズに発揮させることができる。   The ease of elastic compression deformation in the longitudinal direction of the circumferential groove due to the action of the vertical pressing force depends on the wall thickness of the circumferential wall and the longitudinal sectional shape of the circumferential groove (groove width, groove depth, groove side wall The inclination angle from the horizontal direction, etc.) can be set as appropriate, but by setting the groove depth to 2 mm or more with the above configuration, and by setting the inclination angle of the groove sidewall from the horizontal direction to 45 ° or less, Due to the progress of the degree of decompression in the housing, the circumferential groove can be smoothly deformed in the longitudinal direction into a compressed state, and the decompression absorption function can be exhibited smoothly.

本発明の他の構成は、上記主たる構成において、周縁部を、壜体の中心軸方向に向けて斜め上方に傾斜する傾斜面状とする、と云うものである。   Another configuration of the present invention is that, in the main configuration described above, the peripheral portion has an inclined surface shape inclined obliquely upward toward the central axis direction of the housing.

上記構成の壜体は、高温充填工程において、高温の内容液を充填しキャップにより密閉した直後、壜体を形成する合成樹脂が軟化することと、壜体内が加圧状態になることが相俟って、壜体の底壁が下方に向けて膨出状に変形すると云う問題、所謂、底落ち現象を効果的に抑制することを考慮したものである。
そして、上記構成により周縁部を、壜体の中心軸方向に向けて斜め上方に傾斜する傾斜面状とすることにより、上記底落ち現象を効果的に抑制することができ、その後、壜体内が減圧状態になった際には陥没変形部を陥没状に均一に上方変位させて、減圧吸収機能をスムーズに発揮させると共に、周縁部による自立性を十分確保することができる。 In the high-temperature filling step, the case having the above-described structure is considered to be that immediately after the high-temperature content liquid is filled and sealed with a cap, the synthetic resin forming the case is softened and the case is in a pressurized state. Thus, the problem that the bottom wall of the housing is deformed in a bulging shape downward, that is, the so-called bottom falling phenomenon is effectively suppressed.
And by making the peripheral part into the inclined surface shape inclined obliquely upward toward the central axis direction of the casing by the above configuration, the bottom-down phenomenon can be effectively suppressed, and then the casing is When the reduced pressure state is reached, the depressed deformed portion can be uniformly displaced upward in a depressed shape so that the reduced pressure absorption function can be exhibited smoothly and sufficient self-sustainability by the peripheral edge portion can be ensured.

本発明のさらに他の構成は、陥没凹部を、その平断面形状が中央部近傍の円形から基端部の正三角形状まで変化する形状とする、と云う者である。   Still another configuration of the present invention is that the depressed concave portion has a shape in which a flat cross-sectional shape changes from a circular shape near the central portion to an equilateral triangular shape at the proximal end portion.

上記構成により、減圧時における陥没変形部での折れ目の形成を平断面形状で、正三角形の頂点が位置する方向に分散すると共に特定することができ、環状平坦部における折れ目の形成をより効果的に抑制することができる。また、陥没状の変形態様を制御できるので、より安定して、一定の減圧吸収機能を発揮させることができる。   With the above configuration, the formation of the folds at the depression deformed portion at the time of decompression can be specified in a flat cross-sectional shape and dispersed in the direction in which the apex of the equilateral triangle is located, and the formation of the folds at the annular flat portion can be more It can be effectively suppressed. In addition, since the depression-like deformation mode can be controlled, it is possible to exhibit a constant reduced pressure absorption function more stably.

本発明のさらに他の構成は、周縁部の内周縁と突条の外周縁の境界部分に、底面壁を上方、内部方向に段差状に陥没させて形成した溝状凹部を配設する、と云うものである。   According to still another configuration of the present invention, a groove-like recess formed by stepping the bottom wall upward and inward is provided at the boundary between the inner peripheral edge of the peripheral edge and the outer peripheral edge of the protrusion. It is said.

上記構成により、溝状凹部を起点として減圧状態における陥没変形部の陥没状の上方変位をスムーズに進展させることができると共に、周縁部における歪な変形を抑制して周縁部の接地部としての機能を安定して発揮させることができる。   With the above-described configuration, the depression-like upward displacement of the depression-deformed portion in the decompressed state can be smoothly advanced from the groove-like depression as a starting point, and the deformation as a peripheral portion can be suppressed to function as the ground-contact portion of the periphery Can be exhibited stably.

本発明の合成樹脂製壜体は、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を有するものにあっては、壜体内部の減圧度が上昇した際に、底面壁の陥没変形と、周溝の圧縮状の変形による胴部の高さ寸法の短縮化が相俟って十分な減圧吸収機能が十分に発揮されると共に、周縁部が突条に替わって接地部としての機能を発揮するため壜体の自立性が確実に維持される。 Since the synthetic resin casing of the present invention has the above-described configuration, the following effects are exhibited.
In the case of the main configuration of the present invention, when the degree of decompression inside the housing is increased, the height of the body portion can be shortened by the depression deformation of the bottom wall and the compression deformation of the circumferential groove. Together, a sufficient decompression absorption function is sufficiently exhibited, and the peripheral portion exhibits a function as a grounding portion instead of the protrusion, so that the self-supporting property of the casing is reliably maintained.

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の壜体の底面図である。It is a bottom view of the housing of FIG. 図１の壜体の周溝近傍を縦断して示す周壁の外輪郭線図である。It is an outer contour line figure of a peripheral wall which shows a peripheral groove neighborhood of a case of Drawing 1 by carrying out a longitudinal section. 図１の壜体の底部近傍を拡大し、図２中のＡ−Ａ線に沿って示す縦断面図である。FIG. 3 is an enlarged longitudinal sectional view taken along the line AA in FIG. 2, enlarging the vicinity of the bottom of the housing of FIG. 1. 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５の壜体の底面図である。It is a bottom view of the housing of FIG. （ａ）は図５の壜体の図６中のＢ−Ｂ線に沿って示す底部の周縁部と突条の近傍の縦断面図であり、（ｂ）は比較のための壜体について（ａ）と同様に示す縦断面図である。(A) is the longitudinal cross-sectional view of the peripheral part of the bottom part shown along the BB line in FIG. 6 of the housing of FIG. 5, and the vicinity of a protrusion, (b) is about the housing for a comparison ( It is a longitudinal cross-sectional view shown similarly to a). 底部の形状の他の例を示す底面図である。It is a bottom view which shows the other example of the shape of a bottom part. 従来例の壜体を示す（ａ）は正面図、（ｂ）は底面図である。(A) which shows the housing of a prior art example is a front view, (b) is a bottom view.

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１〜４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は底面図、また図３は周溝６近傍を縦断して示す周壁４ａの外輪郭線図、図４は底部５近傍を拡大し、図２中のＡ−Ａ線に沿って示す縦断面図である。この壜体１は口筒部２、肩部３、円筒状の胴部４、底部５を有し、胴部４の最大径が６６ｍｍ、全高さが１３４ｍｍ、容量が２８０ｍｌの丸形壜体で、ＰＥＴ樹脂製の２軸延伸ブロー成形品である。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
1 to 4 show a first embodiment of a synthetic resin casing according to the present invention. FIG. 1 is a front view, FIG. 2 is a bottom view, and FIG. 4a is an outer contour diagram, and FIG. 4 is an enlarged longitudinal sectional view taken along line AA in FIG. This housing 1 is a round housing having a mouth tube portion 2, a shoulder portion 3, a cylindrical body portion 4 and a bottom portion 5. The body portion 4 has a maximum diameter of 66 mm, an overall height of 134 mm, and a capacity of 280 ml. A biaxial stretch blow molded product made of PET resin.

胴部４の周壁４ａには、図３に示されるように胴部４の周壁４ａを屈曲させて、凹状の断面形状を有する４ケの周溝６を付設している。この周溝６の断面形状は台形状で、周溝６の溝深さＤは５ｍｍ、溝上端６ａでの溝幅Ｗｃｔは５ｍｍ、溝底６ｃでの溝幅Ｗｃｂは１．７５ｍｍ、そして溝側壁６ｂの水平方向からの傾斜角度Ａは２０°である。   As shown in FIG. 3, the peripheral wall 4a of the body part 4 is provided with four peripheral grooves 6 having a concave cross-sectional shape by bending the peripheral wall 4a. The cross-sectional shape of the circumferential groove 6 is trapezoidal, the groove depth D of the circumferential groove 6 is 5 mm, the groove width Wct at the groove upper end 6a is 5 mm, the groove width Wcb at the groove bottom 6c is 1.75 mm, and the groove side wall The inclination angle A from the horizontal direction of 6b is 20 °.

胴部４の下端には湾曲筒状に成形されたヒール壁部１１を介して底部５が連設されているが、この底部５の底面の周縁部１２は環状平坦部１２ａとしている。また、周縁部１２の内側には、底面壁を環状平坦部１２ａより下方に突出させて形成した接地部としての機能を発揮する突条１３として周突条１３ａが周設されており、中央部には周突条１３ａの内側を基端とし、縮径状に形成された段部１５ｓを介して底面壁を上方、内部方向に陥没させて形成した陥没凹部１５を配設するようにしている。また、周縁部１２の内周縁と突条１３の外周縁の境界部分には底面壁を上方、内部方向に段差状に陥没させて形成した溝状凹部１７を配設している。   A bottom portion 5 is connected to the lower end of the body portion 4 via a heel wall portion 11 formed in a curved cylindrical shape. A peripheral edge portion 12 of the bottom surface of the bottom portion 5 is an annular flat portion 12a. In addition, a circumferential ridge 13a is provided on the inner side of the peripheral edge portion 12 as a ridge 13 that functions as a grounding portion formed by projecting a bottom wall downward from the annular flat portion 12a. In this case, a concave recess 15 formed by recessing the bottom wall upward and inward through a stepped portion 15s formed in a reduced diameter is provided with the inner side of the circumferential protrusion 13a as a base end. . In addition, a groove-like recess 17 formed by stepping the bottom wall upward and inward is provided at the boundary between the inner peripheral edge of the peripheral edge 12 and the outer peripheral edge of the protrusion 13.

周突条１３ａは、一対の側壁１３ｓと平坦状の先端平坦部１３ｔから形成されており、その断面形状は台形状（Ｕ字状とすることもできる。）であり、本実施例では環状平坦部１２ａからの突出高さＨを２ｍｍ、先端平坦部１３ｔの幅Ｗを６ｍｍとしている。また、陥没凹部１５の形状は、その平断面形状が中央部近傍の円形から基端部の正三角形状まで緩やかに変化する形状としている。ここで、上記のように突条１３を接地部とする場合には、周縁部１２を接地部とする場合に比較して自立性の低下が懸念されるが、突条１３の配設位置を考慮してその突出高さを所定の範囲内とすることにより、たとえ壜体が転倒しかけた際にも、周縁部１２である環状平坦部１２ａが被接地面に当たって支えとすることができ、その転倒角度を低下させることなく、壜体の自立性を保持することができる。   The circumferential ridge 13a is formed of a pair of side walls 13s and a flat tip flat portion 13t, and its cross-sectional shape is trapezoidal (can be U-shaped). The protruding height H from the portion 12a is 2 mm, and the width W of the tip flat portion 13t is 6 mm. Further, the shape of the depressed recess 15 is such that its flat cross-sectional shape gradually changes from a circle near the center to a regular triangle at the base end. Here, when the ridge 13 is used as the grounding portion as described above, there is a concern that the independence may be lowered as compared with the case where the peripheral edge portion 12 is used as the grounding portion. By considering the protruding height within a predetermined range in consideration, even when the housing is about to fall down, the annular flat portion 12a, which is the peripheral portion 12, can contact the grounded surface and be supported. The independence of the housing can be maintained without reducing the falling angle.

上記のような構成により本実施例の壜体１では、高温充填工程後の冷却により壜体１内が減圧状態となった際には、周溝６の周リブ的な作用効果により胴部４の周壁４ａが局部的に反転変形することなく、その円筒状の形状が保持される。
そして、周壁４ａには図３中に白抜き矢印で示されるように縦方向に押圧力が作用し、図３中の２点鎖線で概略的に示したように、周溝６が弾性的に、縦方向に圧縮状に変形して胴部４の高さ寸法が短縮し、
図４中の２点鎖線で概略的に示したように、断面形状が台形状の形状をした周突条１３ａが伸展するように変形し、周突条１３ａから陥没凹部１５にかけての陥没変形部１６が陥没状に、上方変位（図４中の白抜き矢印の方向参照）し、
これら、胴部４の高さ寸法の短縮と、陥没変形部１６の上方変位が相俟って、減圧吸収機能が十分に発揮される。 With the above-described configuration, in the case 1 of this embodiment, when the inside of the case 1 is in a reduced pressure state due to cooling after the high-temperature filling process, the body 4 The cylindrical shape of the peripheral wall 4a is maintained without being locally inverted and deformed.
Then, a pressing force acts on the peripheral wall 4a in the vertical direction as shown by a white arrow in FIG. 3, and the peripheral groove 6 elastically moves as schematically shown by a two-dot chain line in FIG. , The height dimension of the body part 4 is shortened by being deformed in a compressed state in the vertical direction,
As schematically shown by a two-dot chain line in FIG. 4, the circumferential protrusion 13 a having a trapezoidal cross-sectional shape is deformed so as to extend, and a depressed deformation portion extending from the circumferential protrusion 13 a to the depressed recess 15. 16 is displaced upward (see the direction of the white arrow in FIG. 4),
The shortening of the height dimension of the body part 4 and the upward displacement of the depressed deformation part 16 combine to fully exhibit the reduced pressure absorption function.

また、減圧により陥没変形部１６が陥没状に上方変位した状態では、周突条１３ａの替わりに環状平坦部１２ａが接地部としての機能を発揮するので、減圧状態でも壜体１の自立性は保持される。
ここで、周縁部１２の内周縁と突条１３の外周縁の境界部分に溝状凹部１７を配設することにより、この溝状凹部１７を起点として減圧状態における陥没変形部１６の陥没状の上方変位をスムーズに伸展させることができると共に、周縁部１２における歪な変形を抑制して周縁部１２の接地部としての機能をより安定して発揮させることができる。 Further, in the state where the depressed deformed portion 16 is displaced upward due to the reduced pressure, the annular flat portion 12a functions as a grounding portion instead of the circumferential protrusion 13a. Retained.
Here, by disposing a groove-like recess 17 at the boundary between the inner periphery of the peripheral edge 12 and the outer periphery of the ridge 13, the depression-like deformed portion 16 in the decompressed state starts from the groove-like recess 17 as a starting point. The upward displacement can be extended smoothly, and the distortion of the peripheral edge portion 12 can be suppressed and the function of the peripheral edge portion 12 as a ground contact portion can be exhibited more stably.

次に、図５〜図７は、本発明の第２実施例の壜体を示し、図５は正面図、図６は底面図である。この壜体１の全体的な形状は、図１、２に示される壜体と略同様であり、突条１３の形状は、突出高さＨが２ｍｍで幅Ｗが８ｍｍである。   Next, FIGS. 5 to 7 show a housing of a second embodiment of the present invention, FIG. 5 is a front view, and FIG. 6 is a bottom view. The overall shape of the housing 1 is substantially the same as the housing shown in FIGS. 1 and 2, and the shape of the ridge 13 is a protruding height H of 2 mm and a width W of 8 mm.

図７（ａ）はこの第２実施例の壜体の、また（ｂ）はこの実施例に係る比較例の壜体の周縁部１２と突条１３近傍の要部拡大縦断面である。
底部５の形状は、両壜体ともヒール壁部１１から周縁部１２を介して突条１３が連設されており、また、周縁部１２の内周縁と突条１３の外周縁の境界部分には底面壁を上方、内部方向に段差状に陥没させて形成した溝状凹部１７が配設されている。 FIG. 7A is an enlarged vertical cross-sectional view of the main part in the vicinity of the peripheral edge 12 and the ridge 13 of the casing of the comparative example according to this embodiment, and FIG.
As for the shape of the bottom portion 5, the protrusions 13 are continuously provided from the heel wall portion 11 via the peripheral edge portion 12 in both cases, and at the boundary portion between the inner peripheral edge of the peripheral edge portion 12 and the outer peripheral edge of the protrusion 13. Is provided with a groove-shaped recess 17 formed by stepping the bottom wall upward and inwardly in a step shape.

両壜体とも周縁部１２の幅Ｗｐは３ｍｍとしているが、比較例の壜体ではこの周縁部１２が水平状で環状平坦部１２ａとしているのに対して、
第２実施例の壜体では図７（ａ）に見られるように、周縁部１２を、壜体の中心軸方向に向けて斜め上方に傾斜する傾斜面状としているのが特徴である。
そしてこの傾斜面の傾斜の程度を、周縁部１２の下端１２ｂと内周縁の高低差ｈ（図７（ａ）参照）で表わすと、その高低差ｈを０．５ｍｍとしている。 In both cases, the width Wp of the peripheral edge portion 12 is 3 mm, but in the case of the comparative example, the peripheral edge portion 12 is horizontal and has an annular flat portion 12a.
As shown in FIG. 7A, the casing of the second embodiment is characterized in that the peripheral edge portion 12 has an inclined surface inclined obliquely upward toward the central axis direction of the casing.
When the degree of inclination of the inclined surface is expressed by the height difference h (see FIG. 7A) between the lower end 12b of the peripheral edge portion 12 and the inner peripheral edge, the height difference h is set to 0.5 mm.

ここで、高温充填工程において、高温の内容液を充填しキャップにより密閉した直後、壜体を形成する合成樹脂が軟化することと、壜体内が加圧状態になることが相俟って、壜体の底壁が下方に向けて（図７（ａ）中の白抜き矢印の方向）膨出状に変形する、所謂、底落ち現象が発生する。
この底落ち現象は、内容液の充填温度が高くなるほど、また壜体の壁厚を薄肉化するほど大きくなり、ある程度まで大きくなると、壜体内が減圧状態となった際に、陥没変形部１６の陥没状の上方変位が不均一に偏って発生するようになり、その結果減圧吸収機能が十分発揮されず、さらには周縁部で局部的な変形が発生し、壜体の自立性が損なわれるという恐れがある。 Here, in the high temperature filling step, immediately after filling the high temperature content liquid and sealing with the cap, the synthetic resin forming the casing is softened and the inside of the casing is in a pressurized state. A so-called bottoming phenomenon occurs in which the bottom wall of the body is deformed in a bulging shape downward (in the direction of the white arrow in FIG. 7A).
This bottoming phenomenon becomes larger as the filling temperature of the content liquid becomes higher and the wall thickness of the housing is made thinner, and when it is increased to a certain extent, when the housing is in a decompressed state, The depression-like upward displacement occurs unevenly and unevenly. As a result, the reduced pressure absorption function is not sufficiently exhibited, and further, local deformation occurs at the peripheral portion, and the independence of the housing is impaired. There is a fear.

第２実施例の壜体は上記のような、内容液の充填温度のさらなる高温化、壜体の壁厚のさらなる薄肉化に対応するためのものであり、周縁部１２を図７（ａ）に見られるように傾斜状にすることにより、上記の底落ち現象を効果的に抑制するようにしたものである。   The housing of the second embodiment is for dealing with the further increase in the filling temperature of the content liquid and the further thinning of the wall thickness of the housing as described above, and the peripheral portion 12 is shown in FIG. As described above, the bottoming phenomenon is effectively suppressed by making the inclined shape.

なお、周縁部１２の傾斜を大きくしすぎると、底落ちは十分抑制することができるが、一方、減圧時に陥没変形部１６の陥没状の上方変位がし難くなり、減圧吸収機能が十分に発揮されなくなる。
従って、周縁部１２の幅Ｗｐは、減圧時における陥没変形部１６の陥没状の上方変位後の接地部としての機能を考慮して２〜４ｍｍ（第２実施例の壜体では３ｍｍとしている。）の範囲とし、高低差ｈを０．２〜０．８ｍｍ（第２実施例の壜体では０．５ｍｍとしている。）の範囲とすることにより、底落ちを効果的に抑制しながら減圧吸収機能を十分に発揮させることができる。 In addition, if the inclination of the peripheral edge portion 12 is excessively increased, the bottom drop can be sufficiently suppressed, but on the other hand, the depressed deformation portion 16 is difficult to be displaced upward during decompression, and the decompression absorption function is sufficiently exerted. It will not be done.
Accordingly, the width Wp of the peripheral edge portion 12 is 2 to 4 mm (3 mm in the case of the second embodiment) in consideration of the function as the ground contact portion after the depression-like upward displacement of the depression deformation portion 16 at the time of decompression. ) And the height difference h is in the range of 0.2 to 0.8 mm (0.5 mm in the case of the second embodiment). The function can be fully exhibited.

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。
まず、周溝の溝幅、溝深さ、溝側壁の傾斜等を含む縦断面形状、そして配設位置や配設数等は、外観デザイン、必要とされる減圧吸収機能の他に、周溝による胴部の面剛性に係る補強効果、周溝の配設による縦方向の座屈強度の低下の程度を考慮して適宜、設定することができるものである。 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.
First, the longitudinal cross-sectional shape including the groove width, groove depth, groove sidewall inclination, and the like, and the position and number of arrangements of the circumferential groove, in addition to the appearance design and the required vacuum absorption function, the circumferential groove It can be set as appropriate in consideration of the reinforcing effect related to the surface rigidity of the body portion due to the above and the degree of reduction in the buckling strength in the vertical direction due to the arrangement of the circumferential groove.

また、図８に底部の形状の３つの例（ａ）、（ｂ）、（ｃ）を示すように、底部の形状も上記実施例に限定されることなくさまざまなバリエーションのものを採用することができる。
陥没凹部１５の平断面形状を正三角形状に異方性のある形状としたが、図８（ａ）に示したようにその平断面形状を円形状とすること、また図８（ｂ）に示されるように段部１５ｓの部分を多角形状とすることもできる。 Further, as shown in FIG. 8 which shows three examples (a), (b), and (c) of the shape of the bottom, the shape of the bottom is not limited to the above embodiment, and various variations are adopted. Can do.
Although the flat cross-sectional shape of the depression 15 is an equilateral triangular anisotropy, the flat cross-sectional shape is circular as shown in FIG. 8A, and FIG. As shown, the step portion 15s may have a polygonal shape.

また、突条１３の幅、突出高さ等の形状は壜体の大きさや肉厚、壜体の自立性等を考慮すると共に、底面壁の変形のし易さ等の変形態様に係る計算や試験結果を踏まえながら適宜設定することができる。
また、突条１３は上記実施例のように周突条１３ａとすることに限定されるものではなく、図８（ｃ）に示されるように、多数の（図８（ｃ）の例では８ケ）の突条１３を、欠部１３Ｋを挟んで周状に配設する構成とすることもできる。 In addition, the shape of the ridge 13 such as the width and the height of the protrusion considers the size and thickness of the housing, the independence of the housing, etc. It can be set as appropriate based on the test results.
Further, the ridge 13 is not limited to the circumferential ridge 13a as in the above-described embodiment. As shown in FIG. 8C, a large number of ridges 13 (8 in the example of FIG. 8C). The projecting ridges 13) may be arranged around the notch 13K.

また、溝状凹部１７の配設は必要に応じて配設することができ、その幅、溝深さ等の形状は適宜決めることができるものである。
また、周縁部１２を水平平坦状にするか、傾斜面にするか、傾斜の程度をどの程度にするかは、内容液の充填温度、薄肉化の程度等を考慮して適宜決めることができるものである。
Further, the groove-shaped concave portion 17 can be disposed as needed, and the shape such as the width and the groove depth can be appropriately determined.
Further, whether the peripheral edge portion 12 is horizontally flat, inclined, or the degree of inclination can be appropriately determined in consideration of the filling temperature of the content liquid, the degree of thinning, and the like. Is.

本発明の合成樹脂製壜体は、底部の底面壁の陥没変形と胴部の周溝の圧縮状の変形が相俟って十分な減圧吸収機能が十分に発揮されると共に、減圧時にも自立性が十分発揮され、また胴部に減圧吸収パネルがないため平滑な周壁を有し、シュリンクラベルを外装した場合にも皺等がなくスッキリした外観を呈することができるものであり、高温充填を必要とするボトル分野等での幅広い用途展開を期待することができる。
The synthetic resin casing of the present invention combines the depression deformation of the bottom wall of the bottom part with the compression deformation of the circumferential groove of the trunk part to sufficiently exhibit a sufficient decompression absorption function, and is self-supporting even during decompression. It has a smooth peripheral wall because it does not have a vacuum absorbing panel in the body part, and even when a shrink label is externally mounted, it can exhibit a clean appearance without wrinkles, etc. It can be expected to develop a wide range of applications in the required bottle field.

１ ；壜体
２ ；口筒部
３ ；肩部
４ ；胴部
５ ；底部
６ ；周溝
６ａ；溝上端
６ｂ；溝側壁
６ｃ；溝底
１１；ヒール壁部
１２；周縁部
１２ａ；環状平坦部
１３；突条
１３Ｋ；欠部
１３ａ；周突条
１３ｔ；先端平坦部
１３ｓ；側部
１５；陥没凹部
１５ｓ；段部
１６；陥没変形部
１７；溝状凹部
１０１；壜体
１０３；肩部
１０４；胴部
１０７；周溝リブ
１１２；周縁部
１１５；陥没凹部
Ａ ；傾斜角度
Ｄ ；溝深さ
Ｗｃｂ；（溝上端での）溝幅
Ｗｃｔ；（溝底での）溝幅
Ｖ ；折れ目
Ｈ ：（突条の）突出高さ
Ｗ ；（突条の）幅
Ｗｐ；（周縁部の）幅 DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Trunk part 5; Bottom part 6; Circumferential groove 6a; Groove upper end 6b; Groove side wall 6c; Groove bottom 11: Heel wall part 12: Peripheral part 12a; 13; ridge 13K; notch 13a; peripheral ridge 13t; flat tip portion 13s; side 15; depression 15s; step 16; depression deformed portion 17; groove-like depression 101; Trunk portion 107; peripheral groove rib 112; peripheral edge 115; recessed recess A; inclination angle D; groove depth Wcb; groove width Wct (at the groove upper end); groove width V (at the groove bottom); Projection height W (of the ridge); width Wp (of the ridge); width (of the peripheral edge)

Claims (6)

２軸延伸ブロー成形され円筒状の胴部(4)を有する合成樹脂製丸形壜体において、前記胴部(4)の周壁(4a)には周溝(6)を複数配設し、
底部(5)の底面の、周縁部(12)の内側には底面壁を前記周縁部(12)より下方に突出させて形成した接地部としての機能を発揮する突条(13)を配設し、中央部には前記突条(13)の内側を基端として、縮径状に形成された段部（１５ｓ）を介して底面壁を上方、内部方向に陥没させて形成した陥没凹部(15)を配設し、壜体内部の減圧度の上昇に伴い、前記周溝(6)の圧縮状の変形に伴う胴部(4)の高さ寸法の短縮化と、前記周突条（１３ａ）の伸展するような変形による、突条(13)から陥没凹部(15)にかけての底面壁の陥没状の上方変位により減圧吸収機能が発揮されると共に、前記突条(13)の替わりに周縁部(12)が接地部としての機能を発揮する構成とした合成樹脂製丸形壜体。 In a synthetic resin round casing having a cylindrical body (4) that is biaxially stretched and blow molded, a plurality of circumferential grooves (6) are disposed on the peripheral wall (4a) of the body (4),
On the bottom surface of the bottom portion (5), on the inner side of the peripheral edge portion (12), there is disposed a ridge (13) that functions as a grounding portion formed by protruding the bottom wall downward from the peripheral edge portion (12). In the central portion, a recessed portion formed by recessing the bottom wall upward and inward through a step portion (15s) formed in a reduced diameter with the inner side of the protrusion (13) as a base end ( 15), the height of the body (4) is shortened along with the compression deformation of the circumferential groove (6), and the circumferential ridge ( 13a) is capable of exerting a reduced pressure absorption function due to the depression-like upward displacement of the bottom wall from the ridge (13) to the depression (15) due to the extending deformation of 13a), and instead of the ridge (13). A synthetic resin round casing with a configuration in which the peripheral portion (12) functions as a grounding portion. 周溝（６）は、壜体内部の減圧度の上昇に伴う縦方向の押圧力の作用により縦方向に弾性的に圧縮状の変形が可能に周壁（４ａ）を縦断面でみて台形状に屈曲して形成した構成とし、前記周溝(6)の溝深さ(Ｄ)を２ｍｍ以上とした請求項１記載の合成樹脂製丸形壜体。 The circumferential groove (6) has a trapezoidal shape when the circumferential wall (4a) is viewed in a longitudinal section so that the circumferential wall (4a) can be elastically compressed and deformed in the longitudinal direction by the action of the longitudinal pressing force accompanying an increase in the degree of decompression inside the housing. The synthetic resin-made round casing according to claim 1, wherein the circumferential groove (6) has a groove depth (D) of 2 mm or more. 周溝(6)の溝側壁(6b)の水平方向からの傾斜角度(A)を４５°以下とした請求項１または２記載の合成樹脂製丸形壜体。 The synthetic resin round casing according to claim 1 or 2, wherein an inclination angle (A) of the groove side wall (6b) of the circumferential groove (6) from the horizontal direction is 45 ° or less. 周縁部(12)を壜体の中心軸方向に向けて斜め上方に傾斜する傾斜面状とした請求項１、２または３記載の合成樹脂製丸形壜体。 The synthetic resin round casing according to claim 1, 2, or 3, wherein the peripheral edge portion (12) has an inclined surface inclined obliquely upward toward the central axis direction of the casing. 陥没凹部(15)を、その平断面形状が中央部近傍の円形から基端部の正三角形状まで変化する形状とした請求項１、２、３または４記載の合成樹脂製丸形壜体。 The synthetic resin round casing according to claim 1, 2, 3, or 4, wherein the depressed concave portion (15) has a shape in which a flat cross-sectional shape changes from a circle in the vicinity of the central portion to a regular triangular shape at the base end portion. 周縁部(12)の内周縁と突条(13)の外周縁の境界部分に、底面壁を上方、内部方向に段差状に陥没させて形成した溝状凹部(17)を配設した請求項１、２、３または５記載の合成樹脂製丸形壜体。 A groove-shaped recess (17) formed by stepping the bottom wall upwardly and inwardly at the boundary between the inner peripheral edge of the peripheral edge (12) and the outer peripheral edge of the ridge (13) is provided. 1, 2, 3 or 5 synthetic resin round casing.

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