JPH08318923A - Bottle made of polyethylene terephthalate resin - Google Patents
Bottle made of polyethylene terephthalate resinInfo
- Publication number
- JPH08318923A JPH08318923A JP12614395A JP12614395A JPH08318923A JP H08318923 A JPH08318923 A JP H08318923A JP 12614395 A JP12614395 A JP 12614395A JP 12614395 A JP12614395 A JP 12614395A JP H08318923 A JPH08318923 A JP H08318923A
- Authority
- JP
- Japan
- Prior art keywords
- bottle
- unstretched
- polyethylene terephthalate
- terephthalate resin
- less
- 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.)
- Granted
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)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、底部に３以上で奇数個
の脚部を備える自立型のポリエチレンテレフタレート樹
脂製ボトルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-supporting polyethylene terephthalate resin bottle having three or more legs at the bottom and an odd number of legs.
【０００２】[0002]
【従来の技術】従来、炭酸飲料等の陽圧の内容物を入れ
るポリエチレンテレフタレート樹脂製ボトルとしては、
特開平６−２７０９２９号公報に見られるように、下方
に半球状に形成された底部に中空の３以上で奇数個の脚
部を有するものが知られている。この種のポリエチレン
テレフタレート樹脂製ボトルは、その本体底部にベース
キャップを装着することなく複数の脚部で自立させるこ
とができるので、リサイクルの際の仕分け作業等を軽減
することができるものである。2. Description of the Related Art Conventionally, as a bottle made of polyethylene terephthalate resin for containing positive pressure contents such as carbonated drinks,
As disclosed in Japanese Patent Laid-Open No. 6-270929, it is known that a bottom portion formed in a hemispherical shape on the lower side has three or more hollow and odd number of leg portions. This type of polyethylene terephthalate resin bottle can be self-supported by a plurality of legs without mounting a base cap on the bottom of the main body, so that sorting work and the like during recycling can be reduced.
【０００３】しかしながら、前記ボトルは自立させるた
めに設けられた脚部によって底部の形状が複雑となって
いる。このため、ブロー成形時の成形歪みが底部に残留
し、炭酸飲料等の陽圧の内容物を入れた際にその内圧に
よる応力が前記成形歪みに集中し、内圧が高くなった場
合に底部に亀裂等が発生するおそれがある。However, the bottom of the bottle has a complicated shape due to the legs provided for self-supporting. Therefore, the molding strain during blow molding remains at the bottom, and when the contents of positive pressure such as carbonated beverages are put, the stress due to the internal pressure concentrates on the molding strain, and when the internal pressure rises, Cracks may occur.
【０００４】しかも、前記ボトルは射出成形により形成
されたプリフォームを二軸延伸ブロー成形することによ
って形成されるが、ブロー成形の後であっても該底部に
は、射出成形時にプリフォームに形成されたゲート痕跡
が残存したままとなっている。このため、前記のような
内容物による内圧による底部の変形の影響からゲート痕
跡周辺に亀裂が発生しやすい。Moreover, the bottle is formed by subjecting a preform formed by injection molding to biaxial stretch blow molding. Even after the blow molding, the bottle is formed into a preform at the time of injection molding. The traces of the gate that was left remain. Therefore, cracks are likely to occur around the gate trace due to the influence of the deformation of the bottom portion due to the internal pressure due to the contents as described above.
【０００５】そこで、上記公報においては、ゲート痕跡
周辺の肉厚を確保してゲート痕跡周辺の強度を高めるた
めに底部の下方に膨出部が設けられており、内圧により
底部が変形して膨出部が更に下方に膨出しても、脚部に
よる自立を阻害しないように膨出部の高さ寸法が定めら
れてる。Therefore, in the above publication, a bulge portion is provided below the bottom portion in order to secure the wall thickness around the gate trace and enhance the strength around the gate trace, and the bottom portion is deformed and bulged due to internal pressure. The height of the bulging portion is determined so that the leg portion does not hinder the self-standing even when the bulging portion further bulges downward.
【０００６】しかし、前記ボトルの底部に膨出部を設け
ただけでは、底部に残留する成形歪みが原因となる上記
の不都合を回避することはできない。However, it is not possible to avoid the above-mentioned inconvenience caused by the molding strain remaining at the bottom simply by providing the bulging portion at the bottom of the bottle.
【０００７】そこで、前記内容物の内圧によるボトル底
部の変形を防止するために、例えば、ボトル底部を加熱
して結晶化し密度を上げることが考えられる。しかし、
密度を上げ過ぎると、硬度が高くなるためボトル底部の
変形を抑制できる反面、脆くなるため内容物が充填され
たボトルを落下させた際の衝撃によって底部が割れ易く
なる不都合がある。Therefore, in order to prevent the bottom of the bottle from being deformed due to the internal pressure of the contents, for example, it is conceivable to heat the bottom of the bottle to crystallize it and increase its density. But,
If the density is increased too much, the hardness becomes high and deformation of the bottom of the bottle can be suppressed, but it becomes brittle, so that there is a disadvantage that the bottom is easily cracked by the impact when the bottle filled with the contents is dropped.
【０００８】[0008]
【発明が解決しようとする課題】かかる不都合を解消し
て、本発明は、陽圧の内容物に対する耐内圧性と、落下
等に対する耐衝撃性とを共に向上させることができるポ
リエチレンテレフタレート樹脂製ボトルを提供すること
を目的とする。The present invention solves the above inconvenience, and the present invention provides a bottle made of polyethylene terephthalate resin capable of improving both the internal pressure resistance against a positive pressure content and the impact resistance against a drop or the like. The purpose is to provide.
【０００９】[0009]
【課題を解決するための手段】かかる目的を達成するた
めに、本発明は、円筒状の胴部と、下方に半球状に形成
されて該胴部の下端を閉塞し、略中央部にゲート痕跡を
有する底部と、該底部の周方向に等間隔に該底部の下方
に向かって延出された中空の３以上で奇数個の脚部とを
備えたポリエチレンテレフタレート樹脂製ボトルにおい
て、前記底部中心からボトル最大径の２０％以上５０％
以下の同心円面積を有して前記ゲート痕跡を含む範囲内
に実質的に未延伸で且つ非晶状態の未延伸部を設け、前
記底部中心からボトル最大径の８％以上２０％以下の同
心円面積を有して前記ゲート痕跡を含む範囲内に底部の
外方に突出する凸形状部を設けたことを特徴とする。In order to achieve the above object, the present invention is directed to a cylindrical body and a hemispherical lower part that closes the lower end of the body, and a gate is formed substantially at the center. A polyethylene terephthalate resin bottle having a bottom having a trace and three or more hollow odd-numbered legs extending downwardly of the bottom at equal intervals in the circumferential direction of the bottom, wherein the bottom center To 20% or more and 50% of the maximum bottle diameter
The following concentric circle area is provided, and a substantially unstretched and amorphous unstretched portion is provided in the range including the gate trace, and the concentric circle area is 8% or more and 20% or less of the maximum bottle diameter from the center of the bottom. And a convex portion protruding outward from the bottom portion is provided within the range including the gate trace.
【００１０】また、前記未延伸部の中央から該未延伸部
の少なくとも８０％の同心円面積を有する範囲を実質的
に非晶状態としその密度は１．３３６ｇ／cm3 以上１．
３４０ｇ／cm3 以下とすることが好ましい。A range from the center of the unstretched portion having a concentric circle area of at least 80% of the unstretched portion is made substantially amorphous and the density thereof is 1.336 g / cm 3 or more.
It is preferably 340 g / cm 3 or less.
【００１１】[0011]
【作用】本発明は、ボトル底部に実質的に未延伸で且つ
非晶状態の未延伸部を設けることにより該底部を柔軟に
形成して落下時の衝撃による割れ等の発生を防止する。
未延伸部はボトル最大径の２０％以上５０％以下とし、
底部中心からボトル最大径の８％以上２０％以下の同心
円面積を有して前記ゲート痕跡を含む範囲内に底部の外
方に突出する凸形状部を設ける。これにより、該未延伸
部の範囲内にゲート痕跡を位置させ、ボトル底部を柔軟
に形成して該底部を比較的変形し易くして、予め凸形状
部が内容物の陽圧の方向である底部の外方に突出してい
るので、ゲート痕跡とその近傍に底部形状に反した急激
な変形が発生しない。According to the present invention, the bottom portion of the bottle is provided with a substantially unstretched and non-stretched portion in an amorphous state, so that the bottom portion can be flexibly formed to prevent cracking and the like due to impact when dropped.
The unstretched part is 20% or more and 50% or less of the maximum diameter of the bottle,
A convex portion having an area of concentric circles of not less than 8% and not more than 20% of the maximum diameter of the bottle from the center of the bottom and projecting outward of the bottom is provided within a range including the gate trace. As a result, the gate trace is positioned within the range of the unstretched portion, the bottle bottom portion is formed flexibly, and the bottom portion is relatively easily deformed, and the convex shape portion is in the positive pressure direction of the contents in advance. Since it protrudes to the outside of the bottom, the gate trace and its vicinity do not undergo sudden deformation contrary to the shape of the bottom.
【００１２】ここで、発明者は、未延伸部の面積がボト
ル最大径の５０％以下であれば、ボトル底部の変形が比
較的少なくしかも落下時の衝撃を柔軟に分散して十分な
耐衝撃性を得ることができ、未延伸部の面積がボトル最
大径の５０％を越えているとボトルの内圧によって過剰
に変形し易くなることを知見した。また、前記凸形状部
は、ボトル最大径の２０％を越えると、ボトルの内圧が
該凸形状部に集中して長時間経過した際に凸形状が外方
に過剰に膨出し、ボトル最大径の８％未満であると、前
記ゲート痕跡の位置ズレ等に対応することができないこ
とも知見している。更に、未延伸部の面積がボトル最大
径の２０％未満であると凸形状部の形成範囲を制限する
ことになるので好ましくない。従って、本発明において
は、未延伸部をボトル最大径の２０％以上５０％以下と
し、凸形状部をボトル最大径の８％以上２０％以下とし
た。Here, the inventor has found that if the area of the unstretched portion is 50% or less of the maximum diameter of the bottle, the deformation of the bottom portion of the bottle is relatively small and the impact at the time of dropping is flexibly dispersed to provide sufficient impact resistance. It has been found that when the area of the unstretched part exceeds 50% of the maximum diameter of the bottle, it is likely to be excessively deformed by the internal pressure of the bottle. When the convex portion exceeds 20% of the maximum diameter of the bottle, the internal pressure of the bottle concentrates on the convex portion and the convex shape excessively bulges outward when a long time elapses. It has also been found that if it is less than 8%, it is not possible to cope with the positional deviation of the gate trace. Furthermore, if the area of the unstretched portion is less than 20% of the maximum diameter of the bottle, the range of forming the convex portion is limited, which is not preferable. Therefore, in the present invention, the unstretched portion is 20% or more and 50% or less of the maximum bottle diameter, and the convex portion is 8% or more and 20% or less of the maximum bottle diameter.
【００１３】また、該未延伸部の密度を１．３３６ｇ／
cm3 以上１．３４０ｇ／cm3 以下の実質的に非晶状態と
することにより、落下時の衝撃を柔軟に分散して十分な
耐衝撃性を得ることができる。そして、この密度を有す
る範囲は未延伸部の８０％以上とすることにより、該未
延伸部による耐衝撃性を十分に得ることが可能となる。The density of the unstretched portion is 1.336 g /
By providing a substantially amorphous state of not less than cm 3 and not more than 1.340 g / cm 3 , it is possible to flexibly disperse the impact at the time of dropping and obtain sufficient impact resistance. By setting the range having this density to 80% or more of the unstretched portion, it becomes possible to sufficiently obtain the impact resistance of the unstretched portion.
【００１４】[0014]
【実施例】本発明の一実施例を図面に基づいて説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
【００１５】図１は本実施例のポリエチレンテレフタレ
ート樹脂製ボトルの正面図、図２は図１に示すポリエチ
レンテレフタレート樹脂製ボトルの底部の形状を示す平
面図、図３は図２のＩＩＩ−ＩＩＩ線断面図、図４は本
実施例のポリエチレンテレフタレート樹脂製ボトルのブ
ロー成形方法を示す説明的断面図である。FIG. 1 is a front view of the polyethylene terephthalate resin bottle of this embodiment, FIG. 2 is a plan view showing the shape of the bottom of the polyethylene terephthalate resin bottle shown in FIG. 1, and FIG. 3 is a III-III line of FIG. A sectional view and FIG. 4 are explanatory sectional views showing a method of blow molding a polyethylene terephthalate resin bottle of this embodiment.
【００１６】図１に示す本実施例のポリエチレンテレフ
タレート樹脂製ボトル（ＰＥＴボトル）１は、炭酸飲料
を充填するためのボトルであって、胴部２と、胴部２の
下方に設けられた底部３と、胴部２の上方に設けられた
口部４とからなっている。A polyethylene terephthalate resin bottle (PET bottle) 1 of this embodiment shown in FIG. 1 is a bottle for filling a carbonated beverage, and has a body portion 2 and a bottom portion provided below the body portion 2. 3 and a mouth portion 4 provided above the body portion 2.
【００１７】ＰＥＴボトル１において、胴部２はポリエ
チレンテレフタレート樹脂を二軸延伸することにより形
成されており、底部３はその一部に殆ど二軸延伸されな
い実質的な未延伸であり非晶状態が維持された後述する
未延伸部５が形成されている。該未延伸部５の範囲内で
あり底部３の略中央部には二軸延伸の前工程で形成され
る後述のプリフォーム６の射出成形時に形成されたゲー
ト痕跡７が残存する。また、口部４は未延伸であり、口
部４の外周部にはねじ形成部８が設けられている。In the PET bottle 1, the body 2 is formed by biaxially stretching a polyethylene terephthalate resin, and the bottom 3 is substantially unstretched in a part thereof and is substantially unstretched and in an amorphous state. An unstretched portion 5 which will be described later and is maintained is formed. A gate trace 7 formed during injection molding of a preform 6 to be described later, which is formed in a pre-process of biaxial stretching, remains in the center of the bottom portion 3 within the range of the unstretched portion 5. Further, the mouth portion 4 is unstretched, and the thread forming portion 8 is provided on the outer peripheral portion of the mouth portion 4.
【００１８】底部３は、胴部２の下方に半球状に膨出し
ており、更に下方に突出させて設けた複数の脚部９を有
している。ＰＥＴボトル１は脚部９により自立性が付与
されるようになっている。脚部９は、図２及び図３に示
すように、底部３の最下位置となる中心Ｘの周囲に等中
心角毎に５か所に形成されている。The bottom portion 3 bulges in a hemispherical shape below the body portion 2 and has a plurality of leg portions 9 provided so as to project further downward. The PET bottle 1 is designed to be self-supporting by the legs 9. As shown in FIGS. 2 and 3, the leg portions 9 are formed at five locations at equal equiangular angles around the center X which is the lowest position of the bottom portion 3.
【００１９】また、前記底部３の前記未延伸部５は、底
部３の中心ＸからＰＥＴボトル１の最大径の４６％の同
心円面積を占める。更に、該未延伸部５の８０％の同心
円面積を有する範囲の密度は１．３３７ｇ／cm3 に形成
されている。これにより、底部３が柔軟となるので、落
下等の衝撃による底部３の割れ等を防止することができ
る。The unstretched portion 5 of the bottom portion 3 occupies a concentric area of 46% of the maximum diameter of the PET bottle 1 from the center X of the bottom portion 3. Further, the density of the area having a concentric area of 80% of the unstretched portion 5 is formed to 1.337 g / cm 3 . As a result, the bottom portion 3 becomes flexible, so that it is possible to prevent the bottom portion 3 from cracking due to an impact such as a drop.
【００２０】そして更に、前記底部３中心からＰＥＴボ
トル１の最大径の１０％の同心円面積を有する範囲に
は、底部３の下方に突出する凸形状部１０が形成されて
いる。前記ゲート痕跡７は、凸形状部１０が形成された
範囲内に位置されている。これにより、予め凸形状部１
０が底部３の下方に突出しているので、ＰＥＴボトル１
の内圧により、底部３が内部から更に下方に押されても
ゲート痕跡７とその近傍の突出方向が反転されることが
ないのでゲート痕跡７周辺の割れ等の発生を防止するこ
とができる。Further, in a range having a concentric area of 10% of the maximum diameter of the PET bottle 1 from the center of the bottom portion 3, a convex portion 10 projecting downward of the bottom portion 3 is formed. The gate trace 7 is located within the area where the convex portion 10 is formed. As a result, the convex portion 1
Since 0 projects below the bottom part 3, PET bottle 1
Even if the bottom portion 3 is pushed further downward from the inside by the internal pressure, the gate trace 7 and the protruding direction in the vicinity thereof are not reversed, so that the occurrence of cracks around the gate trace 7 can be prevented.
【００２１】本実施例においては、未延伸部５は、底部
３の中心ＸからＰＥＴボトル１の最大径の４６％の同心
円面積を占めるように形成されているが、ＰＥＴボトル
１の最大径の２０％以上５０％以下であればよい。な
お、５０％を超える同心円面積が未延伸部５によって占
められている場合には、底部３が過剰に柔軟となって底
部３に延びが発生するので好ましくなく、２０％未満で
あると後述の凸形状部１０の形成範囲を制限することに
なるので好ましくない。また、未延伸部５の少なくとも
８０％の同心円面積を有する範囲の密度は１．３３６ｇ
／cm3 以上１．３４０ｇ／cm3 以下であればよく、１．
３３７ｇ／cm3 以下であることが最も好ましい。なお、
１．３４０ｇ／cm3 を超える場合には落下時に割れが発
生し易くなるため好ましくない。In the present embodiment, the unstretched portion 5 is formed so as to occupy a concentric area of 46% of the maximum diameter of the PET bottle 1 from the center X of the bottom portion 3. It may be 20% or more and 50% or less. In addition, when the concentric area exceeding 50% is occupied by the unstretched portion 5, the bottom portion 3 becomes excessively flexible and the bottom portion 3 is stretched, which is not preferable. This is not preferable because it limits the formation range of the convex portion 10. Further, the density of the area having the concentric area of at least 80% of the unstretched portion 5 is 1.336 g.
/ Cm 3 or more and 1.340 g / cm 3 or less may be sufficient.
Most preferably, it is 337 g / cm 3 or less. In addition,
If it exceeds 1.340 g / cm 3 , cracking is likely to occur when dropped, which is not preferable.
【００２２】また、凸形状部１０は、底部３の中心Ｘか
らＰＥＴボトル１の最大径の８％以上２０％以下の同心
円面積を有する範囲に形成されていればよい。なお、８
％未満であると、ゲート痕跡７が位置ずれして形成され
ている場合に凸形状部１０に含むことが困難となり、２
０％を超えていると凸形状部１０の形状が大となり過ぎ
るために脚部９による接地位置よりも下方に膨出してＰ
ＥＴボトル１の自立を妨げるおそれがあるため好ましく
ない。The convex portion 10 may be formed in a range having a concentric area of 8% or more and 20% or less of the maximum diameter of the PET bottle 1 from the center X of the bottom portion 3. 8
When it is less than%, it is difficult to include the gate trace 7 in the convex portion 10 when the gate trace 7 is formed with a positional deviation, and 2
If it exceeds 0%, the shape of the convex portion 10 becomes too large, so that it bulges below the ground contact position by the leg portion 9 and P
This is not preferable because it may hinder the independence of the ET bottle 1.
【００２３】本実施例のＰＥＴボトル１は、次のように
して製造することができる。図４に示すように、従来公
知の方法により得られたプリフォーム６を１００℃に加
熱して、口部４を口部成形部１１で保持した状態で、Ｐ
ＥＴボトル１の外部形状に一致する形状の凹部を有する
ブロー成形金型１２に装着する。ブロー成型金型１２
は、胴部成形部１３と底部成形部１４とを備えており、
胴部成形部１３の温度は約６０℃に設定され、底部成形
部１４の温度は約１０℃に設定されている。次いで、プ
リフォーム６の内面側に気体を給入してプリフォーム６
を膨張させる。これにより、胴部２は二軸延伸され、底
部３に脚部９及び凸形状部１０が形成される。このと
き、底部３は十分には二軸延伸されず実質的未延伸の状
態で形成され、胴部２よりも肉厚の厚い未延伸部５とな
る。The PET bottle 1 of this embodiment can be manufactured as follows. As shown in FIG. 4, the preform 6 obtained by a conventionally known method is heated to 100 ° C., and the mouth 4 is held by the mouth molding unit 11,
The ET bottle 1 is mounted on a blow molding die 12 having a recess having a shape corresponding to the external shape. Blow molding die 12
Includes a body forming portion 13 and a bottom forming portion 14,
The temperature of the body forming part 13 is set to about 60 ° C, and the temperature of the bottom forming part 14 is set to about 10 ° C. Then, gas is supplied to the inner surface side of the preform 6 so that the preform 6
Inflate. Thereby, the body portion 2 is biaxially stretched, and the leg portion 9 and the convex portion 10 are formed on the bottom portion 3. At this time, the bottom portion 3 is formed in a substantially unstretched state without being sufficiently biaxially stretched, and becomes the unstretched portion 5 having a larger wall thickness than the body portion 2.
【００２４】次に、ブロー成形金型１２の内部で膨張し
て該金型１２の内壁に接触したＰＥＴボトル１は、底部
成形部１４に接触した部分が底部成形部１４によって冷
却され、比較的低い温度に保たれる。具体的には、底部
成形部１４の設定温度（１０℃）によって底部３成形後
の温度が約４５℃とされて結晶化が防止される。なお、
底部３成形後の温度は底部成形部１４の設定温度によっ
て調整できるが、未延伸部５を非晶状態とするために
は、底部３成形後の温度が５０℃〜６０℃を限度として
底部成形部１４の温度を設定する。Next, in the PET bottle 1 that has expanded inside the blow molding die 12 and has come into contact with the inner wall of the die 12, the portion in contact with the bottom molding portion 14 is cooled by the bottom molding portion 14 and relatively. It is kept at a low temperature. Specifically, the temperature after forming the bottom portion 3 is set to about 45 ° C. by the set temperature (10 ° C.) of the bottom portion forming portion 14, and crystallization is prevented. In addition,
The temperature after forming the bottom portion 3 can be adjusted by the set temperature of the bottom forming portion 14, but in order to make the unstretched portion 5 in an amorphous state, the temperature after forming the bottom portion 3 is limited to 50 ° C to 60 ° C. The temperature of the section 14 is set.
【００２５】これにより、未延伸部５は高温による結晶
化は殆ど行われず、密度は１．３３６ｇ／cm3 以上１．
３４０ｇ／cm3 以下の実質的に非晶状態とされる。この
ようにして、ＰＥＴボトル１の底部に非晶状態の未延伸
部５を形成することができる。As a result, the unstretched portion 5 is hardly crystallized at a high temperature and has a density of 1.336 g / cm 3 or more.
A substantially amorphous state of 340 g / cm 3 or less is obtained. In this way, the amorphous undrawn portion 5 can be formed at the bottom of the PET bottle 1.
【００２６】[0026]
【発明の効果】以上のことから明らかなように、本発明
は、ボトル底部に実質的に未延伸で且つ非晶状態の未延
伸部を設けることにより該底部を柔軟に形成して落下時
の衝撃による割れ等の発生を防止することができる。該
未延伸部は、ボトル最大径の２０％以上５０％以下の同
心円面積としたことにより内圧の影響によって底部が過
剰に変形することを防止しそれによってブロー成形時の
残留歪みによる底部の割れ等を防止することができる。As is apparent from the above, the present invention provides the bottom portion of the bottle with a substantially unstretched and amorphous unstretched portion to flexibly form the bottom portion so that the bottom portion of the bottle is not stretched. It is possible to prevent cracking due to impact. The unstretched portion has a concentric circular area of 20% or more and 50% or less of the maximum diameter of the bottle to prevent the bottom portion from being excessively deformed due to the influence of the internal pressure, whereby the bottom portion is cracked due to residual strain during blow molding. Can be prevented.
【００２７】また、ボトル底部が柔軟に形成されていて
も、前記凸形状部が底部の外方に突出しているので、ゲ
ート痕跡とその近傍に急激な変形が発生せず、ボトルの
内圧によるゲート痕跡周辺の割れ等の発生を防止するこ
とができる。前記凸形状部は、ボトル最大径の８％以上
２０％以下の同心円面積の範囲に設けることにより、凸
形状が下方に過剰に膨出することを防止すると共に、ゲ
ート痕跡に位置ズレ等が発生しても確実にゲート痕跡を
凸形状部に含ませることができる。Further, even if the bottom of the bottle is formed flexibly, since the convex portion projects to the outside of the bottom, no sudden deformation occurs in the trace of the gate and its vicinity, and the gate is caused by the internal pressure of the bottle. It is possible to prevent the occurrence of cracks around the traces. By providing the convex portion within a concentric circle area of 8% or more and 20% or less of the maximum diameter of the bottle, the convex shape is prevented from excessively bulging downward, and a positional deviation or the like occurs in the trace of the gate. Even if it is, the gate trace can be surely included in the convex portion.
【００２８】これによって、落下等に対する高い耐衝撃
性と陽圧の内容物に対する高い耐内圧性とを両立するこ
とができる。This makes it possible to achieve both high impact resistance against drops and the like and high internal pressure resistance against positive pressure contents.
【００２９】また、前記未延伸部の少なくとも８０％の
同心円面積を有する範囲を実質的に非晶状態とし、その
具体的な密度を１．３３６ｇ／cm3 以上１．３４０ｇ／
cm3以下とすることにより、落下時の衝撃を柔軟に分散
して十分な耐衝撃性を得ることができる。A range having a concentric circle area of at least 80% of the unstretched portion is made substantially amorphous, and its specific density is 1.336 g / cm 3 or more and 1.340 g / cm 3.
By setting it to 3 cm 3 or less, the impact at the time of dropping can be flexibly dispersed and sufficient impact resistance can be obtained.
【００３０】従って、本発明によれば、陽圧の内容物に
対する耐内圧性と、落下等に対する耐衝撃性とを共に向
上させることができるポリエチレンテレフタレート樹脂
製ボトルを提供することができる。Therefore, according to the present invention, it is possible to provide a polyethylene terephthalate resin bottle capable of improving both the internal pressure resistance against a positive pressure content and the impact resistance against a drop or the like.
【図１】本実施例のポリエチレンテレフタレート樹脂製
ボトルの正面図。FIG. 1 is a front view of a polyethylene terephthalate resin bottle of this embodiment.
【図２】図１のポリエチレンテレフタレート樹脂製ボト
ルの底部形状を示す平面図。FIG. 2 is a plan view showing the bottom shape of the polyethylene terephthalate resin bottle of FIG.
【図３】図２のＩＩＩ−ＩＩＩ線断面図。3 is a sectional view taken along line III-III in FIG.
【図４】本実施例のポリエチレンテレフタレート樹脂製
ボトルのブロー成形方法を示す説明的断面図。FIG. 4 is an explanatory cross-sectional view showing a blow molding method for a bottle made of polyethylene terephthalate resin according to this embodiment.
１…ポリエチレンテレフタレート樹脂製ボトル、２…胴
部、３…底部、５…実質的未延伸部、７…ゲート痕跡、
９…脚部、１０…凸形状部。DESCRIPTION OF SYMBOLS 1 ... Bottle made of polyethylene terephthalate resin, 2 ... Body part, 3 ... Bottom part, 5 ... Substantially unstretched part, 7 ... Gate trace,
9 ... Legs, 10 ... Convex portion.
Claims (2)
て該胴部の下端を閉塞し、略中央部にゲート痕跡を有す
る底部と、該底部の周方向に等間隔に該底部の下方に向
かって延出された中空の３以上で奇数個の脚部とを備え
たポリエチレンテレフタレート樹脂製ボトルにおいて、 前記底部中心からボトル最大径の２０％以上５０％以下
の同心円面積を有して前記ゲート痕跡を含む範囲内に実
質的な未延伸で非晶状態の未延伸部を設け、 前記底部中心からボトル最大径の８％以上２０％以下の
同心円面積を有して前記ゲート痕跡を含む範囲内に底部
の外方に突出する凸形状部を設けたことを特徴とするポ
リエチレンテレフタレート樹脂製ボトル。1. A cylindrical body portion, a bottom portion formed in a hemispherical shape below to close the lower end of the body portion, and a bottom portion having a gate trace at a substantially central portion, and the bottom portion at equal intervals in the circumferential direction. A polyethylene terephthalate resin bottle having three or more hollow and an odd number of legs extending downward from the bottom, and having a concentric area of 20% or more and 50% or less of the maximum diameter of the bottle from the center of the bottom. Then, a substantially unstretched and amorphous unstretched portion is provided within the range including the gate trace, and the gate trace has a concentric area of 8% or more and 20% or less of the maximum bottle diameter from the center of the bottom. A polyethylene terephthalate resin bottle characterized in that a convex portion projecting outward from the bottom portion is provided within the range including.
くとも８０％の同心円面積を有する範囲を実質的に非晶
状態としその密度は１．３３６ｇ／cm3 以上１．３４０
ｇ／cm3 以下としたことを特徴とする請求項１記載のポ
リエチレンテレフタレート樹脂製ボトル。2. A range from the center of the unstretched portion having a concentric circle area of at least 80% of the unstretched portion is made substantially amorphous, and its density is 1.336 g / cm 3 or more and 1.340.
The polyethylene terephthalate resin bottle according to claim 1, wherein the bottle has a g / cm 3 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12614395A JP3676426B2 (en) | 1995-05-25 | 1995-05-25 | Polyethylene terephthalate resin bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12614395A JP3676426B2 (en) | 1995-05-25 | 1995-05-25 | Polyethylene terephthalate resin bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08318923A true JPH08318923A (en) | 1996-12-03 |
| JP3676426B2 JP3676426B2 (en) | 2005-07-27 |
Family
ID=14927746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12614395A Expired - Fee Related JP3676426B2 (en) | 1995-05-25 | 1995-05-25 | Polyethylene terephthalate resin bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3676426B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006011612A1 (en) * | 2004-07-27 | 2006-02-02 | Toyo Seikan Kaisha, Ltd. | Polyester container excellent in resistance to heat and impact, and method for production thereof |
| JP2006035747A (en) * | 2004-07-29 | 2006-02-09 | Toyo Seikan Kaisha Ltd | Polyester vessel showing excellence in heat resistance and impact resistance and its manufacturing method |
| GB2479451A (en) * | 2010-04-06 | 2011-10-12 | Petainer Lidkoeping Ab | Petaloid Container Base with Reduced Diameter Contact Circle |
-
1995
- 1995-05-25 JP JP12614395A patent/JP3676426B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006011612A1 (en) * | 2004-07-27 | 2006-02-02 | Toyo Seikan Kaisha, Ltd. | Polyester container excellent in resistance to heat and impact, and method for production thereof |
| US7833467B2 (en) | 2004-07-27 | 2010-11-16 | Toyo Seikan Kaisha, Ltd. | Polyester container having excellent heat resistance and shock resistance and method of producing the same |
| JP2006035747A (en) * | 2004-07-29 | 2006-02-09 | Toyo Seikan Kaisha Ltd | Polyester vessel showing excellence in heat resistance and impact resistance and its manufacturing method |
| JP4635506B2 (en) * | 2004-07-29 | 2011-02-23 | 東洋製罐株式会社 | Polyester container excellent in heat resistance and impact resistance and production method thereof |
| GB2479451A (en) * | 2010-04-06 | 2011-10-12 | Petainer Lidkoeping Ab | Petaloid Container Base with Reduced Diameter Contact Circle |
| GB2479451B (en) * | 2010-04-06 | 2012-12-26 | Petainer Lidka Ping Ab | Self-standing container |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3676426B2 (en) | 2005-07-27 |
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