JPH0322094Y2 - - Google Patents
Info
- Publication number
- JPH0322094Y2 JPH0322094Y2 JP1983013077U JP1307783U JPH0322094Y2 JP H0322094 Y2 JPH0322094 Y2 JP H0322094Y2 JP 1983013077 U JP1983013077 U JP 1983013077U JP 1307783 U JP1307783 U JP 1307783U JP H0322094 Y2 JPH0322094 Y2 JP H0322094Y2
- Authority
- JP
- Japan
- Prior art keywords
- boundary
- curved portion
- radius
- concave curved
- inner edge
- 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
Links
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、強化された底部構造を有する耐内圧
プラスチツクボトルに関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pressure-resistant plastic bottle having a reinforced bottom structure.
（従来の技術および考案が解決しようとする課
題）
従来より、プラスチツクのボトルは高温充填に
よる加熱や内圧上昇によつて特に底部が外方にふ
くらみ自立性を失なう問題があつた。このため底
部を上げ底状にした上、花弁状のリブを設けて補
強したり、上げ底の要所に同心円状の段部を設け
て変形を防止していた。しかしながら前者は複雑
な形状のため自立性は保てても変形は避けられず
後者も変形防止効果が不充分であつた。(Problems to be Solved by Prior Art and Ideas) Conventionally, plastic bottles have had the problem that their bottoms in particular bulge outward due to heating and internal pressure increases due to high-temperature filling, causing them to lose their independence. For this reason, the bottom was made to have a raised bottom shape, and petal-shaped ribs were provided to strengthen it, and concentric steps were provided at important points on the raised bottom to prevent deformation. However, since the former has a complicated shape, deformation is inevitable even though it maintains its independence, and the latter also has an insufficient deformation prevention effect.
（課題を解決するための手段）
本考案は底部構造について種々検討した結果下
方に凸の湾曲部と下方に凹の湾曲部とを特定の順
序で組み合わせて底部を構成することにより強度
を向上し得ることを見出し、本考案に至つたもの
であり、以下図面に基いて本考案をさらに詳細に
説明する。(Means for Solving the Problem) As a result of various studies regarding the bottom structure, the present invention improves strength by configuring the bottom by combining a downwardly convex curved portion and a downwardly concave curved portion in a specific order. The present invention will now be described in more detail with reference to the drawings.
第１図は、本考案の耐内圧プラスチツクボトル
の一例を示す縦断面図であり、第２図は従来の例
を示す瓶底部の縦断面図である。 FIG. 1 is a longitudinal sectional view showing an example of the pressure-resistant plastic bottle of the present invention, and FIG. 2 is a longitudinal sectional view of the bottom of the bottle showing a conventional example.
本考案は第１図に示すように上げ底状の底部を
有する耐内圧プラスチツクボトルにおいて、底部
外周の接地部１内縁から中央に向かつて順次高く
なるように、下方に凸で上端がほぼ垂直方向に立
ち上つた湾曲部２、該湾曲部２に続いて急角度で
上方に立ち上つた下方に凹の湾曲部３、段状の境
界３１、下方に凹の湾曲部４を同心円状に連続形
成して少なくとも３つの曲面で底部を構成すると
ともに、接地部１内縁の半径をＲとしたときに前
記境界３１の半径が0.3R≦r3≦0.55Rとしたこと
を特徴とするものである。 As shown in Fig. 1, the present invention is a pressure-resistant plastic bottle with a raised bottom. A rising curved portion 2, a downwardly concave curved portion 3 that rises upward at a steep angle following the curved portion 2, a stepped boundary 31, and a downwardly concave curved portion 4 are continuously formed concentrically. The bottom portion is composed of at least three curved surfaces, and the radius of the boundary 31 satisfies 0.3R≦r 3 ≦0.55R, where R is the radius of the inner edge of the ground contact portion 1.
プラスチツクボトルの材質としては、ポリエチ
レンテレフタレート、ポリ塩化ビニル等が使用で
きるが特にポリエチレンテレフタレートを配向温
度でブロー延伸成形してなる瓶が、その配向効果
によつて底部の強度が極めて向上するので好まし
い。 As the material for the plastic bottle, polyethylene terephthalate, polyvinyl chloride, etc. can be used, but a bottle made of polyethylene terephthalate blow-stretched at an orientation temperature is particularly preferred because the strength of the bottom part is greatly improved by the orientation effect.
下方に凸の湾曲部２は、接地部１内縁から、下
方に凹の湾曲部３との境界２１まで形成され、そ
の上端である境界２１付近ではほぼ垂直方向に立
ち上つており、底部内側が角ばらずに徐々に接地
しているのでこの部分に応力が集中しないととも
に、ブロー延伸時に特に大きく引き伸ばされる底
壁周囲が成形型の接地部内縁近傍でさらに鋭く成
形されて薄くなり過ぎるようなことがないので、
接地部１の強度が保たれる。湾曲部２としては要
するに角ばらなければ良く、瓶の材質や大きさに
より異なるが、ポリエチレンテレフタレートの瓶
では通常、曲率半径が３mm以上が好ましい。 The downwardly convex curved portion 2 is formed from the inner edge of the ground contact portion 1 to the boundary 21 with the downwardly concave curved portion 3, and rises almost vertically near the boundary 21, which is the upper end, and the bottom inner side is Since it touches the ground gradually without being angular, stress will not be concentrated in this area, and the area around the bottom wall, which is particularly stretched during blow stretching, will not be shaped too sharply near the inner edge of the ground contact part of the mold, making it too thin. Since there is no
The strength of the grounding part 1 is maintained. In short, the curved portion 2 only needs to have a non-angular shape, and although it varies depending on the material and size of the bottle, it is usually preferable that the radius of curvature is 3 mm or more for polyethylene terephthalate bottles.
下方に凹の湾曲部３は、上端がほぼ垂直方向に
立ち上つた湾曲部２との境界２１から急角度で上
方に立ち上つているのでその深いアーチ構造によ
り、充填された内容物の重量によつて下方に落ち
込むことがない。湾曲部３と前記湾曲部２との境
界２１は下方に凸から凹への変曲点としてなめら
かに連続しているので、ブロー成形時に底部外周
への瓶壁の移動が成形型上でなめらかに行なわれ
て良好に成形される。 The downwardly concave curved portion 3 rises upward at a steep angle from the boundary 21 with the curved portion 2 whose upper end rises in an almost vertical direction, so its deep arch structure reduces the weight of the filled contents. Therefore, it will not fall downward. Since the boundary 21 between the curved part 3 and the curved part 2 continues smoothly downward as an inflection point from convex to concave, the movement of the bottle wall toward the outer periphery of the bottom on the mold is smooth during blow molding. It is well made and molded well.
２つめの、下方へ凹の湾曲部４は、前記湾曲部
３との間に段状の境界３１を介して連続するよう
に成形すれば良い。この段状の境界３１によつて
底部の強度が向上する。この理由は明らかではな
いが段状の境界３１が補強リブの役割を果すもの
と考えられる。 The second downwardly concave curved portion 4 may be formed so as to be continuous with the curved portion 3 via a stepped boundary 31. This stepped boundary 31 improves the strength of the bottom. Although the reason for this is not clear, it is thought that the stepped boundaries 31 play the role of reinforcing ribs.
この境界３１の位置は接地部１内縁の半径をＲ
として境界３１の半径をr3とすると、0.3R≦r3≦
0.55Rとしたので、底部中心と接地部内周とのほ
ぼ中間に位置して、底部全体に対する補強効果が
高くて好ましい。 The position of this boundary 31 is the radius of the inner edge of the grounding part 1
If the radius of the boundary 31 is r 3 , then 0.3R≦r 3 ≦
Since it is set to 0.55R, it is preferably located approximately midway between the center of the bottom and the inner periphery of the ground-contacting part, and has a high reinforcing effect on the entire bottom.
また、上げ底状底部の中央部５の、接地部１か
らの高さをＨとすると、高さＨは0.4R以上とす
るのが上げ底による補強効果が高くて好ましい。 Further, if the height of the center portion 5 of the raised bottom portion from the ground contact portion 1 is H, it is preferable that the height H is 0.4R or more because the reinforcing effect of the raised bottom is high.
（実施例）
以下、ポリエチレンテレフタレート瓶について
実施例を挙げる。(Example) Examples of polyethylene terephthalate bottles will be given below.
第１図に示す形状の底部を有するポリエチレン
テレフタレート二軸配向瓶であつて、接地部１内
縁の半径Ｒが31.5mm、底部中央部５の高さＨが20
mm、境界２１の半径r2が25mm、境界３１の半径r3
が14.5mm、容量1040c.c.の瓶に75℃の温水1010c.c.を
充填密栓して20℃の雰囲気に24時間放置したとこ
ろほとんど変形がみられなかつた。 It is a polyethylene terephthalate biaxially oriented bottle having a bottom shaped as shown in FIG.
mm, radius r 2 of boundary 21 is 25 mm, radius r 3 of boundary 31
When a bottle with a diameter of 14.5 mm and a capacity of 1040 c.c. was filled with 1010 c.c. of hot water at 75°C and sealed and left in an atmosphere of 20°C for 24 hours, almost no deformation was observed.
これに対して第２図に示す例の接地部１内縁よ
り同心円テーパ部６を介して下方に凹の湾曲部７
が１つだけ形成され底部中央部８に至る構造で接
地部１内縁の半径Ｒが31.5mm底部８の高さＨが20
mmの底部構造を有する容量1040c.c.のポリエチレン
テレフタレート瓶について、上記実施例と同様に
75℃の温水を充填密栓後、20℃で24hr放置したと
ころ、20mmだつた底部８の高さが24hr後で８mmと
なりかなり変形した。 On the other hand, in the example shown in FIG.
The radius R of the inner edge of the grounding part 1 is 31.5 mm, and the height H of the bottom part 8 is 20 mm.
Regarding a polyethylene terephthalate bottle with a capacity of 1040 c.c. and a bottom structure of mm, the same procedure as in the above example was carried out.
After filling with hot water at 75°C and sealing the container, the container was left at 20°C for 24 hours, and the height of the bottom part 8, which was 20 mm, became 8 mm after 24 hours and was considerably deformed.
（考案の効果）
以上説明したように、本考案の耐内圧プラスチ
ツクボトルは、下方に凸の湾曲部、下方に凹の湾
曲部、段状の境界、下方に凹の湾曲部を連続成形
して特定の３つの曲面により底部を構成したこと
により、加熱や内部圧力によつて底部が変形し難
いという、優れた作用効果を示すものである。(Effects of the invention) As explained above, the pressure-resistant plastic bottle of the invention has a downwardly convex curved part, a downwardly concave curved part, a stepped boundary, and a downwardly concave curved part that are continuously formed. By configuring the bottom portion with three specific curved surfaces, the bottom portion is not easily deformed by heating or internal pressure, which is an excellent effect.
第１図は、本考案の耐内圧プラスチツクボトル
の一例を示す、断面図であり、第２図は従来の例
を示す、底部近傍の断面図である。
１……接地部、２……下方に凸の湾曲部、２１
……境界、３……下方に凹の湾曲部、３１……段
状の境界、４……下方に凹の湾曲部。
FIG. 1 is a cross-sectional view showing an example of the pressure-resistant plastic bottle of the present invention, and FIG. 2 is a cross-sectional view of the vicinity of the bottom of a conventional example. 1...Grounding part, 2...Downward convex curved part, 21
...Boundary, 3...Downward concave curved part, 31...Step-like boundary, 4...Downward concave curved part.
Claims (1)
トルにおいて、底部外周の接地部１内縁から中央
に向かつて順次高くなるように、下方に凸で上端
がほぼ垂直方向に立ち上つた湾曲部２、該湾曲部
２に続いて急角度で上方に立ち上つた下方に凹の
湾曲部３、段状の境界３１、下方に凹の湾曲部４
を同心円状に連続形成して少なくとも３つの曲面
で底部を構成するとともに、接地部１内縁の半径
をＲとしたときに前記境界３１の半径r3が0.3R≦
r3≦0.55Rとした耐内圧プラスチツクボトル。 In a pressure-resistant plastic bottle having a raised bottom, the curved portion 2 is convex downward and has an upper end rising in a substantially vertical direction so as to be gradually higher from the inner edge of the ground contact portion 1 on the outer periphery of the bottom toward the center; Following 2, there is a downwardly concave curved portion 3 that rises upward at a steep angle, a stepped boundary 31, and a downwardly concave curved portion 4.
are continuously formed concentrically to constitute the bottom part with at least three curved surfaces, and when the radius of the inner edge of the grounding part 1 is R, the radius r 3 of the boundary 31 is 0.3R≦
Internal pressure resistant plastic bottle with r 3 ≦0.55R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1307783U JPS59118713U (en) | 1983-02-01 | 1983-02-01 | plastic bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1307783U JPS59118713U (en) | 1983-02-01 | 1983-02-01 | plastic bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59118713U JPS59118713U (en) | 1984-08-10 |
| JPH0322094Y2 true JPH0322094Y2 (en) | 1991-05-14 |
Family
ID=30144470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1307783U Granted JPS59118713U (en) | 1983-02-01 | 1983-02-01 | plastic bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59118713U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006501109A (en) * | 2002-09-30 | 2006-01-12 | シー・オー・２・パツク・リミテツド | Vessel structure for removal of vacuum pressure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53149264A (en) * | 1977-06-01 | 1978-12-26 | Yoshino Kogyosho Co Ltd | Apparatus for making polyester bottle |
| FR2408524A1 (en) * | 1977-11-10 | 1979-06-08 | Solvay | HOLLOW BODY IN ORIENTED THERMOPLASTIC MATERIAL |
-
1983
- 1983-02-01 JP JP1307783U patent/JPS59118713U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006501109A (en) * | 2002-09-30 | 2006-01-12 | シー・オー・２・パツク・リミテツド | Vessel structure for removal of vacuum pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59118713U (en) | 1984-08-10 |
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