JPH0698980B2 - Pressure resistant plastic bottle - Google Patents
Pressure resistant plastic bottleInfo
- Publication number
- JPH0698980B2 JPH0698980B2 JP17850690A JP17850690A JPH0698980B2 JP H0698980 B2 JPH0698980 B2 JP H0698980B2 JP 17850690 A JP17850690 A JP 17850690A JP 17850690 A JP17850690 A JP 17850690A JP H0698980 B2 JPH0698980 B2 JP H0698980B2
- Authority
- JP
- Japan
- Prior art keywords
- saddle
- pinch
- shaped curved
- bottle
- curved portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0284—Bottom construction having a discontinuous contact surface, e.g. discrete feet
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、耐圧性に優れた底構造を有する耐圧プラスチ
ックボトルに関する。より詳細には、本発明は新規なク
ロス型底形状を有し、耐圧強度と座りの安定性とに優れ
たプラスチックボトルに関する。TECHNICAL FIELD The present invention relates to a pressure-resistant plastic bottle having a bottom structure with excellent pressure resistance. More specifically, the present invention relates to a plastic bottle having a novel cross type bottom shape and having excellent pressure resistance and sitting stability.
（従来の技術） ポリプロピレンやポリエチレンテレフタレート（PET）
のようなプラスチックを溶融ブロー成形乃至延伸ブロー
成形して成るボトルは、軽量で耐衝撃性と透明性とに優
れており、特にガスバリヤー性樹脂を使用し或いは延伸
ブロー成形したものでは、耐気体透過性にも或る程度優
れていることから、各種飲料、特にビールや炭酸系飲料
を収容するための容器として広く使用されるに至ってい
る。(Conventional technology) Polypropylene and polyethylene terephthalate (PET)
Bottles made by melt blow molding or stretch blow molding of plastics such as are excellent in impact resistance and transparency, and are particularly gas resistant when using gas barrier resin or stretch blow molded. Since it is also excellent in permeability to some extent, it has been widely used as a container for storing various beverages, particularly beer and carbonated beverages.
この種のボトルにおいて耐圧性の点で最も問題となる部
分は底部であり、底部をほぼ球面状とすることにより、
耐圧性を賦与することが既に行われているが、この場合
にはボトルに自立性を与えるために、ボトルとは別個に
成形されたハカマ部品をホットメルト接着剤等により接
合しなければならないという製造工程上及び外観特性上
の問題がある。In this type of bottle, the most problematic point in terms of pressure resistance is the bottom, and by making the bottom almost spherical,
It has already been done to impart pressure resistance, but in this case, in order to give the bottle self-sustainability, it is necessary to join the Hakama parts molded separately from the bottle with hot melt adhesive etc. There are problems in manufacturing process and appearance characteristics.
ボトル底部に耐圧性と同時に自立性を与える底部構造も
既に多く提案されており、例えば特公昭48-5708号公報
には、底部の少なくとも外周に交互に配置されたほぼ球
面状の谷部と、谷部よりも軸方向外方に突出して支持面
と接触する山部（中空脚）とを備えた耐圧プラスチック
ボトルが記載されている。Many proposals have already been made for a bottom structure that imparts pressure resistance and self-supporting properties to the bottom of the bottle.For example, in Japanese Patent Publication No. Sho 48-5708, valleys of approximately spherical shape alternately arranged on at least the outer periphery of the bottom, A pressure-resistant plastic bottle is described, which has peaks (hollow legs) that project axially outwardly beyond the valleys and come into contact with the support surface.
（発明が解決しようとする問題点） この底部構造のボトルは、有底プリフオームを用いるブ
ロー成形乃至延伸ブロー成形法では製造可能であるとし
ても、パイプ状のパリソンを使用し、パリソン端部をピ
ンチオフにより閉じて底部を形成させるブロー成形乃至
延伸ブロー成形の場合には、ピンチオフによる閉じ代が
どうしても必要になり、またパリソン端部をピンチオフ
により閉じながら底部をも膨張しなければならないた
め、底の設計の点で寸法及び形状上の制約を受けること
になる。(Problems to be Solved by the Invention) Although this bottle having a bottom structure can be manufactured by a blow molding method using a bottomed preform or a stretch blow molding method, a pipe-shaped parison is used and the parison end is pinched off. In the case of blow molding or stretch blow molding in which the bottom is closed by means of a pin, a closing margin by pinch-off is inevitable, and the bottom must be expanded while closing the parison end by pinch-off. Therefore, the size and the shape are restricted.
このためピンチオフによる底部を備えたプラスチックボ
トルでは、底部の耐圧強度が十分でなく、内圧による座
屈変形がバックリング変形が生じ易く、耐圧性の点で未
だ十分満足すべきものではなかった。特に内容物を熱間
充填し、或いは自生圧力を有する内容物を充填し充填密
封後加熱殺菌する用途では、ボトルを構成する樹脂の剛
性が低下し或いは内圧が上昇することもあって、ボトル
底部が見苦しく変形して商品価値を損なうという問題が
あった。For this reason, in a plastic bottle having a bottom portion by pinch-off, the pressure resistance strength of the bottom portion is not sufficient, and buckling deformation due to internal pressure easily causes buckling deformation, which is not yet satisfactory in terms of pressure resistance. Particularly in applications where the contents are hot-filled, or where the contents having self-generated pressure are filled, filled and sealed, and then heat-sterilized, the rigidity of the resin forming the bottle may decrease or the internal pressure may increase, so that the bottom of the bottle Had a problem that it was unsightly deformed and the commercial value was lost.
また他の一つの問題は、ボトルが空の状態ではでは自立
性を有するとしてもボトルに自生圧力を有する内容物を
充填したとき自立性或いは自立安定性が損なわれること
である。即ち炭酸ガス含有内容物のビン詰では、圧力で
底部中心が軸方向外方に突出変形したり、或いは更にこ
の突出変形に伴って支持面と接触する底部周辺部自体も
変形することにより、一層顕著に生じる。この自立性或
いは自立安定性が損なわれると、ビン詰が支持面の振動
等により倒れ易くなり、内容物の溢出や落下による破損
等のトラブルを招くことになる。Another problem is that even if the bottle is self-supporting in an empty state, self-supporting property or self-supporting stability is impaired when the bottle is filled with contents having self-generating pressure. That is, in bottling of carbon dioxide-containing contents, the center of the bottom portion is projected and deformed outward in the axial direction due to the pressure, or the peripheral portion itself that contacts the support surface is also deformed due to the protrusion and deformation, so that Remarkably occurs. If this self-sustaining property or self-sustaining stability is impaired, the bottle filling tends to fall down due to the vibration of the supporting surface and the like, which causes troubles such as damage due to overflow or drop of the contents.
従って、本発明の目的はピンチオフによる底部を備えた
耐圧プラスチックボトルにおける上記欠点を改善し、耐
圧性、特に耐圧変形性と、自立性乃至自立安定性との優
れた組合せを有する底部構造の耐圧プラスチックボトル
を提供するにある。Therefore, an object of the present invention is to improve the above-mentioned drawbacks in a pressure-resistant plastic bottle having a bottom portion by pinch-off, and to have a bottom-structured pressure-resistant plastic having an excellent combination of pressure resistance, in particular pressure deformability, and self-sustainability or self-stability. In serving the bottle.
本発明の他の目的は、パイプ状パリソンのブロー成形乃
至延伸ブロー成形に際して、ピンチオフによる所定の形
状、寸法の新規底構造への成形が確実且つ容易に行われ
た耐圧プラスチックボトルを提供するにある。Another object of the present invention is to provide a pressure-resistant plastic bottle in which, during blow molding or stretch blow molding of a pipe-shaped parison, molding into a novel bottom structure having a predetermined shape and size by pinch-off is reliably and easily performed. .
（問題点を解決するための手段） 本発明によれば、プラスチックパリソンのブロー成形乃
至延伸ブロー成形で形成された口部、胴部及び底部から
成り且つ底部にはピンチオフにより閉塞部が形成されて
いるプラスチックボトルにおいて、該ボトル底部は、対
向する複数辺に分割されたボトル支持用底周辺部の対
と、対となった底周辺部間に、上向きに湾曲して形成さ
れた鞍状湾曲部と、該鞍状湾曲部の下面側でこれを横切
って橋掛けするように形成された底ピンチオフ橋絡部と
から成り、前記鞍状湾曲部の下側には胴部下方を貫通す
るトンネル状空間が形成されており、且つ前記底ピンチ
オフ橋絡部はトンネル状空間を中間で遮断し且つその下
端が接地面よりも若干上に位置するように設けられてい
ることを特徴とする耐圧プラスチックボトルが提供され
る。(Means for Solving the Problems) According to the present invention, the plastic parison comprises a mouth portion, a body portion and a bottom portion formed by blow molding or stretch blow molding, and the bottom portion has a closed portion formed by pinch-off. In the present plastic bottle, the bottle bottom has a saddle-shaped curved portion formed by curving upward between a pair of bottle supporting bottom peripheral portions divided into a plurality of opposing sides and a pair of bottom peripheral portions. And a bottom pinch-off bridging portion formed so as to bridge across the lower surface side of the saddle-shaped curved portion, and a tunnel shape penetrating below the trunk portion on the lower side of the saddle-shaped curved portion. A space is formed, and the bottom pinch-off bridge portion is provided so as to cut off the tunnel-shaped space in the middle and the lower end thereof is located slightly above the ground plane. Are provided.
本発明のボトルでは、胴部の径をＬ、胴部の厚みをＣ、
鞍状湾曲部の幅をＷ、鞍状湾曲部の高さをＤ、鞍状湾曲
部の上部の曲率半径をＲ、その厚みをRc、ピンチオフ橋
絡部の厚みをPwとしたとき、底部は、下記式 W/L＞1/4 ‥‥‥‥‥（１） D/W＞3/5 ‥‥‥‥‥（２） Ｒ≦10mm ‥‥‥‥‥（３） Rc≧2C ‥‥‥‥‥（４） Pw≧1.3C ‥‥‥‥‥（５） を満足する寸法を有することが好ましい。In the bottle of the present invention, the diameter of the body is L, the thickness of the body is C,
When the width of the saddle-shaped curved portion is W, the height of the saddle-shaped curved portion is D, the radius of curvature of the upper portion of the saddle-shaped curved portion is R, its thickness is R c , and the thickness of the pinch-off bridging portion is P w , bottom, the following equation W / L> 1/4 ‥‥‥‥‥ (1 ) D / W> 3/5 ‥‥‥‥‥ (2) R ≦ 10mm ‥‥‥‥‥ (3) R c ≧ 2C ‥‥‥‥‥ (4) preferably has a P w ≧ 1.3C dimensions satisfying ‥‥‥‥‥ (5).
（作用） 本発明の耐圧プラスチックボトルは、プラスチックパリ
ソンのブロー成形乃至延伸ブロー成形で形成された口
部、胴部及び底部を備え、その底部にはピンチオフによ
る閉塞部が形成されているが、対向する複数辺に分割さ
れたボトル自立用底周辺部の対と、対となった底周辺部
間に上向きに湾曲して形成された鞍状湾曲部と、該鞍状
湾曲部の下面側でこれを横切って橋掛けするように形成
された底ピンチオフ橋絡部とを底部に有することが顕著
な特徴である。(Operation) The pressure-resistant plastic bottle of the present invention is provided with a mouth portion, a body portion and a bottom portion formed by blow molding or stretch blow molding of a plastic parison, and a closing portion due to pinch-off is formed at the bottom portion thereof. A pair of bottle self-supporting bottom peripheral portions divided into a plurality of sides, a saddle-shaped curved portion formed by curving upward between the paired bottom peripheral portions, and a saddle-shaped curved portion on the lower surface side. It is a salient feature to have a bottom pinch-off bridging portion formed to bridge across the bottom.
ピンチオフによる閉塞部が形成されている通常のボトル
底部では、ボトル支持面と接触する周辺部リング状に連
続した形となり、中央部がやや窪んで、この窪んだ部分
にピンチオフ部が形成されている。これに対して本発明
では、底周辺部を、連続した形ではなく、対向する複数
辺に分割された形で設けることが第一の特徴である。即
ち、以下に説明する構造との組み合わせにおいては、底
周辺部が複数の辺（弧）の形に分割されていた方がボト
ルの耐圧変形性や自立性乃至自立安定性が向上すると言
うのが本発明の基本的思想である。In a normal bottle bottom part where a blockage part due to pinch-off is formed, it becomes a continuous shape like a peripheral ring contacting the bottle support surface, the center part is slightly recessed, and the pinch-off part is formed in this recessed part . On the other hand, the first feature of the present invention is that the bottom peripheral portion is provided not in a continuous form but in a form divided into a plurality of opposing sides. That is, in the combination with the structure described below, it can be said that when the bottom peripheral portion is divided into a plurality of sides (arcs), the pressure resistance deformability and the self-sustaining or self-sustaining stability of the bottle are improved. This is the basic idea of the present invention.
次に、対となった底周辺部間に上向きに湾曲して形成さ
れた鞍状湾曲部を設けるのが第二の特徴である。鞍状湾
曲部とは、その両端は開放しているが、それ以外の部分
は上向きに凸の局面をなしている湾曲部を謂う。この鞍
状湾曲部は、ボトル底部に加わる内圧を一点に集中させ
ずに分散させて、耐圧性を向上させる作用と、以下に説
明するピンチオフによる閉塞部を十分に大きな面積でし
かも十分な厚さに確保する作用とを行う。Next, the second feature is to provide a saddle-shaped curved portion formed by curving upward between the paired peripheral portions of the bottom. The saddle-shaped curved portion is a curved portion in which both ends thereof are open, but the other portions are upwardly convex. This saddle-shaped curved portion disperses the internal pressure applied to the bottom of the bottle without concentrating it at one point to improve the pressure resistance, and has a sufficiently large area for the blocking portion due to pinch-off described below and a sufficient thickness. To ensure the action.
所で、対となった底周辺部間に比較的大きい鞍状湾曲部
を設けた場合には、この鞍状湾曲部が一定の圧力以上に
なるとバックリングを引き起こす可能性がある。本発明
では、この鞍状湾曲部の下面側にこれを横切って橋掛け
するようにピンチオフ橋絡部を形成する事が、第３のそ
して最大の特徴である。即ち、このピンチオフ橋絡部に
より鞍状湾曲部の両側面が強固に確実に固定されるた
め、内圧が著しく高い場合にも鞍状湾曲部のバックリン
グが有効に防止され、底部の耐圧力が著しく向上すると
共に、底周辺部の変形も抑制されるため、内圧が高い場
合にも自立性や自立安定性が損なわれることがない。If a relatively large saddle-shaped curved portion is provided between the pair of bottom peripheral portions, buckling may occur when the saddle-shaped curved portion has a certain pressure or more. In the present invention, the third and greatest feature is that the pinch-off bridging portion is formed on the lower surface side of the saddle-shaped curved portion so as to bridge across the same. That is, since both side surfaces of the saddle-shaped curved portion are firmly and firmly fixed by the pinch-off bridging portion, buckling of the saddle-shaped curved portion is effectively prevented even when the internal pressure is extremely high, and the pressure resistance of the bottom portion is increased. Not only is it remarkably improved, but also the deformation of the peripheral portion of the bottom is suppressed, so that even when the internal pressure is high, self-sustainability and self-sustaining stability are not impaired.
本発明では、このように鞍状湾曲部とその下面側のピン
チオフ橋絡部とを十字型にクロスした構造としたことに
より、優れた耐圧性と自立性乃至自立安定性との組み合
わせとが得られるものである。本発明による上記作用
は、用いるプラスチックが比較的剛性に乏しいものであ
る場合や、加熱殺菌等で高温で高い圧力を受ける場合に
特に著しい。またピンチオフによる底の閉塞も確実にし
かも強固な形で行われるため、漏洩発生やピンチオフ不
良等の不良品の発生率を著しく低減させて、製品の歩留
まりを著しく向上させることができる。In the present invention, the structure in which the saddle-shaped curved portion and the pinch-off bridging portion on the lower surface side thereof are cross-shaped in this manner provides a combination of excellent pressure resistance and self-sustainability or self-stability. It is what is done. The above-mentioned action according to the present invention is particularly remarkable when the plastic used has a relatively low rigidity or when a high pressure is applied at a high temperature due to heat sterilization or the like. Further, since the bottom is closed certainly by pinch-off in a reliable and strong manner, it is possible to remarkably reduce the occurrence rate of defective products such as leakage and defective pinch-off, and significantly improve the product yield.
本発明のボトル底部は前記式（１）乃至（５）の諸寸法
を有することが特に望ましい。鞍状湾曲部の幅Ｗが式
（１）の範囲よりも小さい場合や、その高さ（深さ）が
式（２）の範囲よりも小さくなる場合には、強固なピン
チオフ部の形成が困難ものとなったり、十分な耐圧性が
得られなくなる傾向がある。また、自立性や自立安定性
の低下する傾向が認められる。鞍状湾曲部の曲率半径が
式（３）を下回り、或いはその厚みが式（４）より低く
なると、鞍状湾曲部の機械的強度が不十分となり、高圧
力下でその形態を保てなくなる傾向がある。ピンチオフ
部の厚みが式（５）の範囲よりも小さくなる場合には、
強固なピンチオフ部の形成が困難なものとなり、十分な
耐圧性が得られなくなり、また、自立性や自立安定性も
低下する傾向が認められる。It is particularly desirable for the bottle bottom of the present invention to have the dimensions of equations (1) to (5) above. When the width W of the saddle-shaped curved portion is smaller than the range of the formula (1) or when the height (depth) thereof is smaller than the range of the formula (2), it is difficult to form a strong pinch-off part. However, there is a tendency that sufficient pressure resistance cannot be obtained. In addition, there is a tendency that independence and independence stability decline. If the radius of curvature of the saddle-shaped curved portion is lower than the expression (3) or the thickness thereof is lower than that of the expression (4), the mechanical strength of the saddle-shaped curved portion becomes insufficient and the shape cannot be maintained under high pressure. Tend. If the thickness of the pinch-off part is smaller than the range of equation (5),
It is difficult to form a strong pinch-off portion, sufficient pressure resistance cannot be obtained, and the self-sustainability and self-stability tend to decrease.
（実施例） 本発明の耐圧プラスチックボトルの全体の配置を示す第
１図（一部断面側面図）、第２図（底面図）及び第３図
（第１図のボトルを90度回転して示す一部断面側面図）
において、このプラスチックボトル１は、プラスチック
パリソンのブロー成形乃至延伸ブロー成形で一体に成形
された筒状の胴部２、胴部の下端を閉じている底部３、
胴部の上端に肩部４を介して連なる口部５からなってい
る。この具体例の容器においては、口部５の下部にはキ
ャップ６（第３図参照）を締結するためのネジ７が設け
られている。また胴部２と肩部４との境界部分には、こ
の部分を補強し且つ容器の伸縮を緩和するための凹ビー
ド８が設けられている。(Example) FIG. 1 (partially sectional side view), FIG. 2 (bottom view) and FIG. 3 (partial cross-sectional side view) showing the entire arrangement of the pressure-resistant plastic bottle of the present invention are rotated 90 degrees. (Partial cross-section side view shown)
In this plastic bottle 1, a tubular body portion 2 integrally formed by blow molding or stretch blow molding of a plastic parison, a bottom portion 3 closing the lower end of the body portion,
A mouth portion 5 is connected to the upper end of the body portion via a shoulder portion 4. In the container of this specific example, a screw 7 for fastening a cap 6 (see FIG. 3) is provided at the lower portion of the mouth portion 5. In addition, a concave bead 8 is provided at the boundary between the body 2 and the shoulder 4 to reinforce this portion and reduce expansion and contraction of the container.
本発明のボトルは、底部３の形状及び構造に特徴を有す
るものであり、この底部３は対向する複数辺（この具体
例では２辺の弧）に分割されたボトル自立用底周辺部9
a,9bの対と、対となった底周辺部間に上向きに湾曲して
形成された鞍状湾曲部10と、鞍状湾曲部10の下面側でこ
れを横切って橋掛けするように形成された底ピンチオフ
橋絡部11とからなる。底周辺部9a、9bは円弧の形をなし
ていて、ボルト支持面と接触するが、この底周辺部間は
切り欠かれていて、鞍状湾曲部10となっている。この鞍
状湾曲部10は上部（頂部）12と両側部13a、13bとからな
っており、それらの両末端は胴部が切りかかれた開口と
なっている。鞍状湾曲部の両側13a、13bは中心側で間隔
が最も小さく、径外方に向けて間隔が次第に大きくなる
ようになっている。また、鞍状湾曲部の上部12はやはり
中心側で高さが最も小さく、径外方に向けて高さが次第
に大きくなるようになっている。鞍状湾曲部10の中心に
両側部13a、13bを横切り、これを橋掛けするように、ピ
ンチオフ部11が形成される。より詳細に説明すると、鞍
状湾曲部10の両側部13a、13bと底周辺部9a、9bとの間に
は段差部14a、14bが設けられており、ピンチオフ橋絡部
11はこれら段差部14a、14bの下面側を通って底周辺部9
a、9bのごく近傍まで延びている。この様に底周辺部9
a、9bのごく近傍まで延びるをように、ピンチオフ橋絡
部11を連結させることにより、底周辺部9a、9bの内圧に
よる変形を殆ど完全に防止し、ボトルの座りを著しく良
好なものとする事ができる。ピンチオフ部11の下端15と
底周辺部9a、9bとの段差はかなり小さなものとできるこ
とも本発明の顕著な特徴である。と言うのは、鞍状湾曲
部とその下面側のピンチオフ橋絡部とを十字型にクロス
した構造では、内圧がかなり高い場合にもこの全体の構
造が軸方向下方に変形する量は殆ど無視し得るからであ
る。The bottle of the present invention is characterized by the shape and structure of the bottom portion 3. The bottom portion 3 is divided into a plurality of opposing sides (in this specific example, an arc of two sides), and the peripheral portion 9 for the bottom of the bottle self-standing.
A pair of a and 9b, a saddle-shaped curved portion 10 formed by curving upward between the paired bottom peripheral portions, and a lower surface side of the saddle-shaped curved portion 10 formed so as to bridge across the same. And the bottom pinch-off bridging portion 11 formed. The bottom peripheral portions 9a, 9b are in the shape of an arc and contact the bolt supporting surface, but the bottom peripheral portions are notched to form a saddle-shaped curved portion 10. The saddle-shaped curved portion 10 is composed of an upper portion (top portion) 12 and both side portions 13a and 13b, and both ends thereof are openings in which the body portion is cut out. Both sides 13a, 13b of the saddle-shaped curved portion have the smallest distance on the center side, and the distance gradually increases toward the radially outer side. Further, the upper portion 12 of the saddle-shaped curved portion has the smallest height on the center side, and the height gradually increases toward the radially outer side. A pinch-off portion 11 is formed so as to cross both side portions 13a and 13b in the center of the saddle-shaped curved portion 10 and bridge them. More specifically, step portions 14a and 14b are provided between the side portions 13a and 13b of the saddle-shaped curved portion 10 and the bottom peripheral portions 9a and 9b, and the pinch-off bridging portion is provided.
11 is a bottom peripheral portion 9 passing through the lower surface side of these step portions 14a and 14b.
It extends very close to a and 9b. In this way, the bottom peripheral part 9
By connecting the pinch-off bridging portion 11 so as to extend to the immediate vicinity of a and 9b, deformation of the bottom peripheral portions 9a and 9b due to internal pressure is almost completely prevented, and the sitting of the bottle is remarkably good. I can do things. It is also a remarkable feature of the present invention that the step between the lower end 15 of the pinch-off portion 11 and the bottom peripheral portions 9a and 9b can be made quite small. This is because in the structure where the saddle-shaped curved part and the pinch-off bridging part on the lower surface side are crossed in a cross shape, even if the internal pressure is considerably high, the amount of deformation of this entire structure in the axial downward direction is almost ignored. Because you can.
本発明の耐圧プラスチックボトルにおいては、前述した
本発明の精神を逸脱しない範囲で多くの変更が可能であ
る。例えば底周辺部を対向する二辺とする代わりに、４
辺、６辺或いはそれ以上の辺に分割することができ、ま
た底周辺部に多数の微小突起を形成したりすることがで
きる。また、鞍状湾曲部は滑らかな曲面となっているこ
とが圧力を分散させるために望ましいが、上部と両側部
とが滑らかに接続させている限り、両側面の垂直断面形
状は特に制限を受けず、例えば直線状、２次曲線状であ
っても良い。第４図は底部の各寸法を示すものである
が、一般に前記式（１）乃至（５）の寸法満足するよう
に定める。経済上及び製造上の見地からは、胴厚Ｃは１
乃至3mmの範囲にあるのがよく、Rcは3C以下、Pwは2.5C
以下であるのが良い。Many modifications can be made to the pressure-resistant plastic bottle of the present invention without departing from the spirit of the present invention described above. For example, instead of using two opposite sides at the bottom periphery, 4
It can be divided into sides, 6 sides or more, and a large number of minute protrusions can be formed on the peripheral portion of the bottom. Also, it is desirable that the saddle-shaped curved portion has a smooth curved surface in order to disperse pressure, but as long as the upper part and both sides are smoothly connected, the vertical cross-sectional shape of both sides is not particularly limited. Alternatively, for example, it may be linear or quadratic curve. FIG. 4 shows the respective dimensions of the bottom portion, but they are generally determined so as to satisfy the dimensions of the equations (1) to (5). From an economic and manufacturing standpoint, the body thickness C is 1
To 3 mm, R c is 3 C or less, P w is 2.5 C
The following is good.
本発明において、容器本体を構成する樹脂としては、ブ
ロー成形可能で且つ内圧に耐える強度を有する熱可塑性
樹脂であれば任意のものを用いることができる。このよ
うな樹脂として、高密度ポリエチレン、ポリプロピレ
ン、ポリブテン−１、ポリ−４−メチルペンテン−１、
プロピレン−エチレン共重合体、プロピレン−ブテン−
１共重合体、アイオノマー等のオレフイン樹脂；ポリエ
チレンテレフタレート（PET）、ポリブチレンテレフタ
レート等の熱可塑性ポリエステル；ポリカーボネート
類；アクリル−ブタジエン−スチレン共重合体（ABS樹
脂）；ポリアセタール樹脂；ナイロン６、ナイロン66、
それらの共重合ナイロン等のナイロン類；ポリメチルメ
タクリレート等のアクリル樹脂；ポリアリレート、ポリ
スルホン、等を挙げることができる。これらの樹脂は単
独でも２種以上の組み合わせでも使用することができ、
例えば２種以上の樹脂のブレンド物の形で、或いは２種
以上の多層積層物の形で使用することができる。ピンチ
オフによる閉塞底部の形成は、ポリプロピレン等のオレ
フイン樹脂のブロー成形や延伸ブロー成形に広く適用さ
れていることから、本発明は、ボトル形成用のプラスチ
ックの少なくとも一部がオレフイン樹脂からなる成るも
のに好適に適用される。ポリプロピレンが特に好適な樹
脂である。In the present invention, as the resin constituting the container body, any resin can be used as long as it is a thermoplastic resin that can be blow-molded and has strength to withstand internal pressure. As such resin, high density polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1,
Propylene-ethylene copolymer, propylene-butene-
1 Copolymers, olefin resins such as ionomers; thermoplastic polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate; polycarbonates; acrylic-butadiene-styrene copolymers (ABS resins); polyacetal resins; nylon 6, nylon 66 ,
Examples thereof include nylons such as copolymerized nylon; acrylic resins such as polymethylmethacrylate; polyarylate and polysulfone. These resins can be used alone or in combination of two or more kinds,
For example, it can be used in the form of a blend of two or more kinds of resins, or in the form of a multilayer laminate of two or more kinds. Since the formation of the closed bottom portion by pinch-off is widely applied to blow molding and stretch blow molding of olefin resin such as polypropylene, the present invention provides that at least a part of the plastic for forming the bottle is made of olefin resin. It is preferably applied. Polypropylene is a particularly suitable resin.
本発明の容器は、耐圧容器であり、内部にガスが充填さ
れることから、ガスに対するバリヤー性を有しているこ
とが好ましく、このためにガスバリヤー性樹脂、例えば
エチレン−ビニルアルコール共重合体、ナイロン樹脂、
塩化ビニリレン樹脂、ハイニトリル樹脂との多層積層耐
の形で用いるのがよい。ガスバリヤー樹脂はオレフイン
樹脂内外層に対して、中間層として組み合わせるのが、
ピンチオフ部の形成を確実にする上でも、ガスバリヤー
樹脂の外部へ露出を防止する上でも望ましいが、湿度の
影響の少ない樹脂の場合には内層或いは外層として設け
ることもできる。The container of the present invention is a pressure resistant container, and since it is filled with gas, it is preferable that it has a gas barrier property. For this reason, a gas barrier resin such as an ethylene-vinyl alcohol copolymer is preferred. , Nylon resin,
It is preferably used in the form of multi-layer lamination resistance with vinylene chloride resin or high nitrile resin. The gas barrier resin is combined with the olefin resin inner and outer layers as an intermediate layer.
Although it is desirable to ensure the formation of the pinch-off portion and to prevent the gas barrier resin from being exposed to the outside, it can be provided as an inner layer or an outer layer in the case of a resin that is less affected by humidity.
また、耐圧性が要求されることから、この樹脂は大きな
剛性乃至強度を有しているのがよく、このためオレフイ
ン樹脂を用いる場合には、剛性の大きいエンジニアプラ
スチックを積層して、多層の形で組み合わせて用いるの
がよい、例えば前述したガスバリヤー樹脂の多くは高い
剛性を有しており、またポリエステル、ポリカーボネー
トも高い剛性を有するのでこの目的に使用できる。Also, since pressure resistance is required, it is preferable that this resin has great rigidity or strength. Therefore, when olefin resin is used, engineering plastics with high rigidity are laminated to form a multilayer structure. It is preferable to use them in combination with each other. For example, most of the above-mentioned gas barrier resins have high rigidity, and polyester and polycarbonate also have high rigidity, so that they can be used for this purpose.
本発明において、ブロー成形用乃至延伸ブロー成形用パ
リソからのボトルの製造は、前述した特徴とする点、即
ちパリソンのピンチオフを前述した底形状に対応する金
型を使用する点を除けば、それ自体周知の方法で実施す
ることができる。例えば、ブロー成形（溶融ブロー成
形）に際しては、樹脂をリングダイを通してパイプ状に
押し出し、押し出されたパリソンが未だ溶融状態にある
間に、ブロー型で挟んでパリソン内に流体を吹き込んで
所定形状に成形する。一方延伸ブロー成形に際しては、
樹脂をパイプの形に溶融押し出しし、これを冷却して所
定サイズに裁断した後、このパイプ状プリフォームを延
伸温度に予備加熱した後、ブロー型中で軸方向に引張り
延伸すると共に、周方向に膨張延伸させる事によりボト
ルの形に成形する。勿論、本発明の耐圧プラスチックボ
トルを製造するには、用いるブロー金型として前述した
底形状と一致する形状のものを用いるのは当然である
が、本発明の底の構造では、ピンチオフによる底閉塞が
確実に不良品の発生無しに行われるのも本発明の利点の
一つである。In the present invention, the production of a bottle from a blow molding or stretch blow molding pariso except for the feature point described above, that is, the use of a mold corresponding to the above-mentioned bottom shape for the parison pinch-off, It can be carried out by a method known per se. For example, in blow molding (melt blow molding), resin is extruded into a pipe shape through a ring die, and while the extruded parison is still in a molten state, it is sandwiched by a blow mold and a fluid is blown into the parison to give it a predetermined shape. Mold. On the other hand, during stretch blow molding,
The resin is melt extruded in the shape of a pipe, cooled and cut into a predetermined size, and after preheating this pipe-shaped preform to a stretching temperature, it is stretched and stretched in the axial direction in a blow mold, and in the circumferential direction. It is expanded and stretched to form a bottle. Of course, in order to manufacture the pressure-resistant plastic bottle of the present invention, it is natural to use a blow mold having a shape corresponding to the above-mentioned bottom shape, but in the bottom structure of the present invention, bottom closure by pinch-off is used. It is one of the advantages of the present invention that the process is performed without fail.
実施例１及び比較例1. 内外層としてポリプロピレン樹脂（ｄ＝0.9,MI＝1.
5）、中間層としてエチレン−ビニルアルコール共重合
体（ビニルアルコール含有量36重量％）、内外層と中間
層との間の接着剤層として酸変性ポリプロピレンの多層
パリソンをブロー成形して、第１乃至３図に示す形状
で、外径（Ｌ）66mm、高さ150mm、内容積300mlの円筒形
の多層ブロー成形ボトルを製造した。Example 1 and Comparative Example 1. Polypropylene resin (d = 0.9, MI = 1.
5), an ethylene-vinyl alcohol copolymer (vinyl alcohol content 36% by weight) is used as the intermediate layer, and a multi-layer parison of acid-modified polypropylene is blow-molded as the adhesive layer between the inner and outer layers and the intermediate layer. A cylindrical multi-layer blow-molded bottle having an outer diameter (L) of 66 mm, a height of 150 mm and an inner volume of 300 ml was manufactured in the shape shown in FIGS.
胴部肉厚（Ｃ）は1.2mm（内層：外層：中間層の厚み比
＝1:1:0.1）で、鞍状湾曲部の幅（Ｗ）22m、高さ（Ｄ）
16mm、上部の曲率半径（Ｒ）7mm、ピンチオフ橋絡部の
厚み（Pw）2mmであった。Body thickness (C) is 1.2 mm (thickness ratio of inner layer: outer layer: middle layer = 1: 1: 0.1), saddle-like curved part width (W) 22 m, height (D)
The radius of curvature (R) of the upper portion was 16 mm, the thickness of the pinch-off bridge portion (P w ) was 2 mm.
評価として、2kg/cm2の圧力になるように調整された炭
酸ガス入りソーダを上記容器に詰めたところ、底部のバ
ックリングもなく、また異常な変形もなく、自立性の良
好であった。更に１ヶ月常温で保存したが、何等異常が
なく、良好であった。As an evaluation, when soda containing carbon dioxide gas adjusted to have a pressure of 2 kg / cm 2 was packed in the above container, there was no buckling at the bottom and no abnormal deformation, and the self-sustaining property was good. Further, it was stored for one month at room temperature, and it was good without any abnormality.
比較として、実施例１と同様の方法で、底部形状を通常
のフラットなものものとして成形し、2kg/cm2の圧力に
調整された炭酸ガス入りソーダを詰めたところ、直ちに
バックリングを起こし、容器が転倒した。圧力を下げて
バックリングが生じない条件を求めたところ、その限界
は0.2kg/cm2であった。For comparison, in the same manner as in Example 1, the bottom shape was molded into a normal flat shape, and when soda containing carbon dioxide gas adjusted to a pressure of 2 kg / cm 2 was packed, immediate buckling occurred, The container fell. When the pressure was reduced to obtain the condition that buckling did not occur, the limit was 0.2 kg / cm 2 .
実施例２乃至７及び比較例２乃至7. 低密度ポリエチレン（LDPE）、高密度ポリエチレン（HD
PE）、エチレン−ビニルアルコール共重合体（EVOH）、
ポリプロピレン（PP）、塩化ビニル樹脂（PVC）、ナイ
ロン樹脂（Ny）、ポリカーボネート（PC）下記第１表の
層構成で用いる以外は、実施例１及び比較例１と同様に
してボトルを製造した。尚EVOHは厚さ0.1mmで、その他
の樹脂は厚さ1mmで使用した。結果を第１表に示す。Examples 2 to 7 and Comparative Examples 2 to 7. Low density polyethylene (LDPE), high density polyethylene (HD
PE), ethylene-vinyl alcohol copolymer (EVOH),
Bottles were produced in the same manner as in Example 1 and Comparative Example 1 except that polypropylene (PP), vinyl chloride resin (PVC), nylon resin (Ny), polycarbonate (PC) were used in the layer structure shown in Table 1 below. EVOH had a thickness of 0.1 mm, and other resins had a thickness of 1 mm. The results are shown in Table 1.
（発明の効果） 本発明によれば、ボトル底部を、対向する複数辺に分割
されたボトル支持用底周辺部の対と、対となった底周辺
部間に上向きに湾曲して形成された鞍状湾曲部と、該鞍
状湾曲部の下面側でこれを横切って橋掛けするように形
成された底ピンチオフ橋絡部とから構成し、鞍状湾曲部
とその下面側のピンチオフ橋絡部とを十字型にクロスし
た構造としたことにより、優れた耐圧性と自立性乃至自
立安定性との組み合わせとが得られるものである。本発
明による上記作用は、用いるプラスチックが比較的剛性
に乏しいものである場合や、加熱殺菌等で高温で高い圧
力を受ける場合に特に著しい。またピンチオフによる底
の閉塞も確実にしかも強固な形で行われるため、漏洩発
生やピンチオフ不良等の不良品の発生率を著しく低減さ
せて、製品の歩留まりを著しく向上させることができ
る。 (Effect of the Invention) According to the present invention, the bottle bottom portion is formed by curving upward between the pair of bottle supporting bottom peripheral portions divided into a plurality of opposing sides and the paired bottom peripheral portions. The saddle-shaped curved portion and the bottom pinch-off bridging portion formed so as to bridge across the lower surface side of the saddle-shaped curved portion, the saddle-shaped curved portion and the pinch-off bridging portion on the lower surface side thereof. By adopting a cross-shaped structure of and, it is possible to obtain a combination of excellent pressure resistance and self-sustainability or self-stability. The above-mentioned action according to the present invention is particularly remarkable when the plastic used has a relatively low rigidity or when a high pressure is applied at a high temperature due to heat sterilization or the like. Further, since the bottom is closed certainly by pinch-off in a reliable and strong manner, it is possible to remarkably reduce the occurrence rate of defective products such as leakage and defective pinch-off, and significantly improve the product yield.
本発明の耐圧プラスチックボトルは上記特性に優れてい
ることから、自生圧力を有する内容物、例えばビール、
炭酸入り清涼飲料、炭酸入り果汁飲料や窒素充填内容物
を充填し保存する包装容器として有用である。Since the pressure-resistant plastic bottle of the present invention is excellent in the above-mentioned characteristics, contents having autogenous pressure, such as beer,
It is useful as a packaging container for filling and storing carbonated soft drinks, carbonated fruit juice drinks and nitrogen-filled contents.
第１図は本発明の耐圧プラスチックボトルの全体の配置
を示す一部断面側面図、 第２図は本発明の耐圧プラスチックボトルにおける底形
状の底面図、 第３図は第１図の耐圧プラスチックボトルを90度回転し
て示す一部断面側面図、 第４図はボトル底部における各部材の諸寸法を説明する
ための説明図である。 １はボトル、２胴部、３は底部、４は肩部、５は口部、
9a、9bは底周辺部、10は鞍状湾曲部、11はピンチオフ橋
絡部である。1 is a partial cross-sectional side view showing the overall arrangement of the pressure-resistant plastic bottle of the present invention, FIG. 2 is a bottom view of the bottom shape of the pressure-resistant plastic bottle of the present invention, and FIG. 3 is the pressure-resistant plastic bottle of FIG. FIG. 4 is a side view of a partial cross section of the bottle rotated by 90 degrees, and FIG. 4 is an explanatory view for explaining various dimensions of each member at the bottom of the bottle. 1 is a bottle, 2 is a body, 3 is a bottom, 4 is a shoulder, 5 is a mouth,
9a and 9b are peripheral portions of the bottom, 10 is a saddle-shaped curved portion, and 11 is a pinch-off bridging portion.
Claims (2)
伸ブロー成形で形成された口部、胴部及び底部から成り
且つ底部にはピンチオフによる閉塞部が形成されている
プラスチックボトルにおいて、 該ボトル底部は、対向する複数辺に分割されたボトル支
持用底周辺部の対と、対となった底周辺部間に、上向き
に湾曲して形成された鞍状湾曲部と、該鞍状湾曲部の下
面側でこれを横切って橋掛けするように形成された底ピ
ンチオフ橋絡部とから成り、 前記鞍状湾曲部の下側には胴部下方を貫通するトンネル
状空間が形成されており、且つ前記底ピンチオフ橋絡部
はトンネル状空間を中間で遮断し且つその下端が接地面
よりも若干上に位置するように設けられていることを特
徴とする耐圧プラスチックボトル。1. A plastic bottle comprising a mouth portion, a body portion and a bottom portion formed by blow molding or stretch blow molding of a plastic parison and having a closed portion by pinch-off at the bottom portion, wherein the bottle bottom portions are opposed to each other. A pair of bottle supporting bottom peripheral portions divided into a plurality of sides, a saddle-shaped curved portion formed by curving upward between the paired bottom peripheral portions, and a lower surface side of the saddle-shaped curved portion. And a bottom pinch-off bridging portion formed so as to bridge across this, and a tunnel-like space penetrating below the trunk is formed below the saddle-shaped curved portion, and the bottom pinch-off portion is formed. A pressure-resistant plastic bottle characterized in that the bridge portion is provided so as to block the tunnel-shaped space in the middle and the lower end thereof is located slightly above the ground contact surface.
部の幅をＷ、鞍状湾曲部の高さをＤ、鞍状湾曲部の上部
の曲率半径をＲ、その厚みをRc、ピンチオフ橋絡部の厚
みをPwとしたとき、底部は、下記式 W/L＞1/4 D/W＞3/5 Ｒ≦10mm Rc≧2C Pw≧1.3C を満足する寸法を有することを特徴とする請求項１記載
の耐圧プラスチックボトル。2. The diameter of the body portion is L, the thickness of the body portion is C, the width of the saddle-shaped curved portion is W, the height of the saddle-shaped curved portion is D, and the radius of curvature of the upper portion of the saddle-shaped curved portion is R, When the thickness is R c and the thickness of the pinch-off bridging part is P w , the bottom part has the following formula W / L> 1/4 D / W> 3/5 R ≦ 10 mm R c ≧ 2C P w ≧ 1.3C The pressure-resistant plastic bottle according to claim 1, which has a size that satisfies
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17850690A JPH0698980B2 (en) | 1990-07-07 | 1990-07-07 | Pressure resistant plastic bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17850690A JPH0698980B2 (en) | 1990-07-07 | 1990-07-07 | Pressure resistant plastic bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0472130A JPH0472130A (en) | 1992-03-06 |
| JPH0698980B2 true JPH0698980B2 (en) | 1994-12-07 |
Family
ID=16049658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17850690A Expired - Fee Related JPH0698980B2 (en) | 1990-07-07 | 1990-07-07 | Pressure resistant plastic bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0698980B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2228400C (en) * | 1996-05-30 | 2006-05-02 | Yoshino Kogyosho Co., Ltd. | Extrusion-blow molded container having cylindrical body and metal mold for producing the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5127451U (en) * | 1974-08-21 | 1976-02-28 | ||
| JPS63178931A (en) * | 1986-12-27 | 1988-07-23 | 田原 吉昌 | Multilayer blow molded vessel and manufacture thereof |
-
1990
- 1990-07-07 JP JP17850690A patent/JPH0698980B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0472130A (en) | 1992-03-06 |
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