JPH0986528A - Self-sustained bottle - Google Patents
Self-sustained bottleInfo
- Publication number
- JPH0986528A JPH0986528A JP24467695A JP24467695A JPH0986528A JP H0986528 A JPH0986528 A JP H0986528A JP 24467695 A JP24467695 A JP 24467695A JP 24467695 A JP24467695 A JP 24467695A JP H0986528 A JPH0986528 A JP H0986528A
- Authority
- JP
- Japan
- Prior art keywords
- self
- bottle
- ground contact
- contact surface
- thickness
- 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.)
- Pending
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)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加熱殺菌処理を行
った場合の高温・高圧状態においても異常変形すること
のない、自立型ボトルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-supporting bottle that does not deform abnormally even when subjected to heat sterilization even at high temperature and high pressure.
【０００２】[0002]
【従来の技術】従来、ポリエチレンテレフタレート（以
下、単にＰＥＴと呼ぶ）で代表されるポリエステル樹脂
などからなるプラスチツクボトルは、果汁入り炭酸飲料
用容器などのように加熱殺菌時における高温・高圧に耐
える必要がある場合には、底部を半球状の耐圧形状と
し、ベースカップと称するスカート状の保持台を装着し
て自立性を付与していた。2. Description of the Related Art Conventionally, plastic bottles made of polyester resin typified by polyethylene terephthalate (hereinafter simply referred to as PET) are required to withstand high temperature and high pressure during heat sterilization, such as containers for carbonated beverages containing fruit juice. In some cases, the bottom portion has a hemispherical pressure-resistant shape, and a skirt-shaped holding table called a base cup is attached to provide self-supporting property.
【０００３】しかしながら、ベースカップの装着は、
（１）コストが大となる、（２）リサイクルの際に障害
となる、（３）加熱殺菌のシャワーの流れを妨げる（結
果としてベースカップ付近で内容物の温度上昇が遅れ
る）等の問題を生じさせるため、その底部が半球状曲面
の底面から下方に膨出させた複数の脚部を周方向に略等
間隔で配置された自立型ボトルが要請されている。However, the mounting of the base cup is
Problems such as (1) high cost, (2) obstacles during recycling, (3) obstructing the flow of the shower for heat sterilization (as a result, the temperature rise of the contents is delayed near the base cup) In order to generate it, a self-standing bottle in which a plurality of legs whose bottoms bulge downward from the bottom surface of a hemispherical curved surface are arranged at substantially equal intervals in the circumferential direction is required.
【０００４】[0004]
【発明が解決しようとする課題】従来からある炭酸飲料
用ボトルのような自立型ボトルに炭酸水を充填し、加熱
殺菌処理を行った場合、高温時の高い内部圧力に耐えき
れず底部が著しく変形し、ボトルが直立できなくなると
いう問題があった。本発明は、上記欠点を無くし、底部
が自立性のある形状であり、なおかつ高度の耐熱・耐圧
性を有するボトルを提供するものである。When a self-supporting bottle such as a conventional carbonated beverage bottle is filled with carbonated water and subjected to heat sterilization treatment, it cannot withstand a high internal pressure at a high temperature and its bottom is remarkably high. There was a problem that it was deformed and the bottle could not stand upright. The present invention eliminates the above-mentioned drawbacks, and provides a bottle having a self-supporting bottom portion and having a high degree of heat resistance and pressure resistance.
【０００５】[0005]
【課題を解決するための手段】本発明は、二軸延伸成形
されたプラスチックボトルにおいて、その底部が半球状
曲面の底面から下方に膨出させた複数の脚部を周方向に
略等間隔で配置されてあり、エチレンテレフタレート単
位を９９〜９０モル％およびエチレン−２，６−ナフタ
レート単位を１〜１０モル％含有するポリエステルから
なることを特徴とする自立型ボトルである。DISCLOSURE OF THE INVENTION The present invention is a biaxially stretch-molded plastic bottle having a plurality of legs whose bottom bulges downward from the bottom surface of a hemispherical curved surface at substantially equal intervals in the circumferential direction. A self-supporting bottle, characterized in that it is arranged and consists of polyester containing 99 to 90 mol% of ethylene terephthalate units and 1 to 10 mol% of ethylene-2,6-naphthalate units.
【０００６】テレフタル酸成分と２，６−ナフタレンジ
カルボン酸成分とが含まれている組成物とは、（I ）Ｐ
ＥＴおよびポリエチレンナフタレート（以下、単にＰＥ
Ｎと呼ぶことがある）からなる混合物、（II）テレフタ
ル酸、２，６−ナフタレンジカルボン酸、エチレングリ
コールを反応させることにより生成されるコポリエステ
ル、（III ）ＰＥＴと（II）に示したコポリエステルか
らなる混合物などが挙げられる。A composition containing a terephthalic acid component and a 2,6-naphthalenedicarboxylic acid component is (I) P
ET and polyethylene naphthalate (hereinafter, simply PE
N)), (II) terephthalic acid, 2,6-naphthalenedicarboxylic acid, a copolyester produced by reacting ethylene glycol, (III) PET and the copolyester shown in (II). Examples include a mixture of polyester.
【０００７】また、エチレンテレフタレート単位を９９
〜９０モル％およびエチレン−２，６−ナフタレート単
位を１〜１０モル％含有するとは、ポリエステル中のエ
チレンテレフタレート単位とエチレン−２，６−ナフタ
レート単位との総量に対し、エチレン−２，６−ナフタ
レート単位が１〜１０モル％であれば良い。Further, the ethylene terephthalate unit is 99
-90 mol% and 1-10 mol% of ethylene-2,6-naphthalate units are contained in the polyester based on the total amount of ethylene terephthalate units and ethylene-2,6-naphthalate units. The naphthalate unit may be 1 to 10 mol%.
【０００８】ＰＥＴとＰＥＮの混合物を使用する場合に
おいては、ＰＥＴ９０〜９９重量％、ＰＥＮ１〜１０重
量％の混合物を使用するとよい。When a mixture of PET and PEN is used, a mixture of PET 90 to 99% by weight and PEN 1 to 10% by weight is preferably used.
【０００９】ＰＥＮが１重量％以下とした場合には十分
な効果が発揮されず、加熱殺菌時、底部が変形し、自立
性を失われ、また、ＰＥＮが１０重量％以上の場合には
成形性が悪くなるという問題が生じてくる。When PEN is less than 1% by weight, the sufficient effect is not exhibited, the bottom part is deformed during heat sterilization and self-sustaining property is lost, and when PEN is more than 10% by weight, molding is performed. The problem arises that the sex becomes worse.
【００１０】本発明において、前記底面中央最下部にお
ける肉厚は２．５ｍｍ以上、好ましくは３．２ｍｍ以上
とすることにより、加熱処理時における底部変形をより
効果的に抑えることができる。また、この肉厚は６．０
ｍｍ以下とするのが、冷却速度低下に伴う白化のおそれ
が少ないなどの理由により好ましい。In the present invention, when the thickness at the bottom center lowermost portion is 2.5 mm or more, preferably 3.2 mm or more, bottom deformation during heat treatment can be suppressed more effectively. Also, this wall thickness is 6.0
The thickness of not more than mm is preferable for the reason that there is little risk of whitening due to a decrease in cooling rate.
【００１１】また、本発明におけるボトルは成形時にお
いて、底部は前記脚部における接地面の密度が１．３６
５ｇ／ｃｍ3 以上、好ましくは１．３７０ｇ／ｃｍ3 と
なる程度に熱処理されると、加熱処理時における底部変
形をさらに効果的に抑えることができるので好ましい。Further, when the bottle of the present invention is molded, the bottom portion has a density of the ground contact surface of the leg portion of 1.36.
5 g / cm 3 or more, so preferably the heat treated to the extent that a 1.370g / cm 3, it is possible to further effectively suppressed bottom deformation during heat treatment preferred.
【００１２】さらに、接地面から前記底面中央最下部ま
での高さは４．０ｍｍ以上、好ましくは６．０ｍｍ以上
とすることにより、万が一底部が変形した場合において
も自立性を保持させることが可能となる。また、この高
さは２０ｍｍ以下とするのが、成形精度が低下するおそ
れが少ないなどの理由により好ましい。Further, by setting the height from the ground contact surface to the lowermost part of the center of the bottom surface to be 4.0 mm or more, preferably 6.0 mm or more, it is possible to maintain the self-supporting property even if the bottom is deformed. Becomes Further, this height is preferably set to 20 mm or less for the reason that the molding accuracy is less likely to decrease.
【００１３】[0013]
【発明の実施の形態】図１は本発明による耐熱・耐圧性
ボトルの例を示す全体正面図、図２は図１における底部
の拡大断面図、図３は本発明による耐熱・耐圧性ボトル
の例を示す底面図である。1 is an overall front view showing an example of a heat-resistant and pressure-resistant bottle according to the present invention, FIG. 2 is an enlarged sectional view of a bottom portion in FIG. 1, and FIG. 3 is a heat-resistant and pressure-resistant bottle according to the present invention. It is a bottom view which shows an example.
【００１４】本発明は図１〜３に示すように、二軸延伸
成形されたプラスチックボトルにおいて、その底部１が
半球状曲面の底面１１から下方に膨出させた複数の脚部
２を周方向に略等間隔で配置されてあり、エチレンテレ
フタレート単位を９９〜９０モル％およびエチレン−
２，６−ナフタレート単位を１〜１０モル％含有するポ
リエステルからなることを特徴とする自立型ボトルであ
る。As shown in FIGS. 1 to 3, the present invention is a biaxially stretched plastic bottle having a plurality of leg portions 2 whose bottom portion 1 bulges downward from a bottom surface 11 of a hemispherical curved surface in the circumferential direction. Are arranged at substantially equal intervals, and contain 99 to 90 mol% of ethylene terephthalate units and ethylene-
A self-supporting bottle comprising a polyester containing 1 to 10 mol% of 2,6-naphthalate units.
【００１５】また、前記底面１１中央最下部１０の肉厚
が２．５〜６．０ｍｍの範囲であり、前記脚部２の接地
面２１の肉厚が０．３〜０．８ｍｍの範囲であることを
特徴としている。In addition, the thickness of the bottom center 11 of the bottom surface 11 is in the range of 2.5 to 6.0 mm, and the thickness of the ground contact surface 21 of the leg 2 is in the range of 0.3 to 0.8 mm. It is characterized by being.
【００１６】そして、少なくとも前記脚部の接地面の密
度が１．３６５〜１．３７５ｇ／ｃｍ3 の範囲となるよ
うに前記底部が熱処理されてあることを特徴としてい
る。The bottom portion is heat-treated so that the density of the ground contact surface of at least the leg portion is in the range of 1.365 to 1.375 g / cm 3 .
【００１７】さらに、前記脚部２の接地面２１から前記
底面１１中央最下部１０までの高さＨが４．０〜２０ｍ
ｍの範囲であることを特徴としている。Further, the height H from the ground contact surface 21 of the leg portion 2 to the central bottom portion 10 of the bottom surface 11 is 4.0 to 20 m.
It is characterized in that it is in the range of m.
【００１８】[0018]
【実施例】本実施例において、ガスボリウムとは、２０
℃、１気圧において炭酸ガスを水に溶解するとき、溶解
する炭酸ガスの体積の、水の体積に対する倍率で表した
ものである。また、密度は密度勾配管により測定した。EXAMPLE In this example, the gas volume is 20
When carbon dioxide is dissolved in water at 1 ° C. and 1 ° C., the ratio of the volume of dissolved carbon dioxide to the volume of water is represented. The density was measured by a density gradient tube.
【００１９】本実施例において、評価は以下のように行
なった。In this example, evaluation was performed as follows.
【００２０】成形性：成形直後のボトルの外観を各条件
５本ずつ目視して、形忠実に成形され、かつ平坦面に立
てた時に正立するものを○、立てた時に傾くものを△、
一見して形状が形忠実でないものを×で表した。Moldability: The appearance of the bottle immediately after molding was visually checked under five conditions, and the shape was faithfully molded, and the one standing upright when standing on a flat surface was ○, the one tilting when standing was △.
At first glance, the shape that was not faithful to the shape was represented by x.
【００２１】加熱処理後外観：成形後のボトル各条件５
本ずつに、２．５ガスボリウムの炭酸水を充填し、加熱
殺菌処理（７０℃シャワー×４０分）を行なったものに
つき、外観を目視して底部にほとんど変形の見られない
ものを◎、平坦面に立てた時に自立可能なものを○、平
坦面に立てた時に倒れるものを×で表した。Appearance after heat treatment: each condition of bottle after molding 5
Each one was filled with 2.5 gas volume of carbonated water and subjected to heat sterilization treatment (70 ° C shower x 40 minutes). When standing on a flat surface, the one that can stand on its own is indicated by a circle, and when standing on a flat surface, the one that falls down is indicated by a cross.
【００２２】［実験例１〜６］ 表１に示すように、
ＰＥＴ ９９．５Ｋｇ〜８５．０Ｋｇ、ＰＥＮ ０．５
Ｋｇ〜１５．０Ｋｇを攪拌混合した後、射出成形により
予備成形品を成形し、これを胴部金型温度が８５℃であ
り、底型温度が１３０℃であるブロー金型内においてブ
ロー成形することにより、底面中央最下部の肉厚が３．
０ｍｍであり、底面中央最下部の高さが６ｍｍであり、
かつ脚部における接地面の肉厚が０．３５ｍｍ、密度が
１．３７ｇ／ｃｍ3 であり図１〜３に示すようなボトル
を成形した。Experimental Examples 1 to 6 As shown in Table 1,
PET 99.5Kg-85.0Kg, PEN 0.5
After stirring and mixing Kg to 15.0 Kg, a preform is molded by injection molding, and this is blow-molded in a blow mold having a body mold temperature of 85 ° C and a bottom mold temperature of 130 ° C. As a result, the thickness of the bottom bottom center bottom is 3.
0 mm, the height of the bottom center bottom is 6 mm,
In addition, the thickness of the ground contact surface of the leg portion was 0.35 mm, the density was 1.37 g / cm 3 , and a bottle as shown in FIGS.
【００２３】上記方法により得られたＰＥＴボトルにつ
き、成形性および加熱処理後外観を評価した結果を表１
に示す。The PET bottles obtained by the above method were evaluated for moldability and appearance after heat treatment.
Shown in
【００２４】[0024]
【表１】 表１から明らかなように、ＰＥＮが０．５重量％と少な
い実験例１では、耐熱性が不十分であり、熱処理すると
脚部が変形し、自立性が失われた。またＰＥＮが１５重
量％と多い実験例６では、一見して形の悪いボトルしか
得られず、成形性に劣るものであった。[Table 1] As is clear from Table 1, in Experimental Example 1 in which the PEN content was as low as 0.5% by weight, the heat resistance was insufficient, and the legs were deformed by heat treatment and the self-supporting property was lost. Further, in Experimental Example 6 in which the PEN content was as high as 15% by weight, only a bottle having a bad shape at first glance was obtained, and the moldability was poor.
【００２５】一方、その組成中にテレフタル酸成分と
２，６−ナフタレンジカルボン酸成分が１．０重量％か
ら１０重量％の比率で含まれている組成物からなる実験
例２〜５のものは、成形性も良好であるとともに、加熱
殺菌処理を行った場合でも、ほとんど変形しないか、少
々変形しても自立性は保たれ、耐熱・耐圧性に優れるも
のであった。On the other hand, those of Experimental Examples 2 to 5 composed of a composition containing a terephthalic acid component and a 2,6-naphthalenedicarboxylic acid component in the composition in a ratio of 1.0% by weight to 10% by weight. The moldability was good, and even when it was subjected to the heat sterilization treatment, it hardly deformed, or even if it deformed a little, it maintained its self-supporting property and was excellent in heat resistance and pressure resistance.
【００２６】［実験例７〜１２］ ＰＥＴ ９５Ｋ
ｇ、ＰＥＮ ５Ｋｇを攪拌混合した後、射出成形により
予備成形品を成形し、これを胴部金型温度が８５℃であ
り、底型温度が１３０℃であるブロー金型内においてブ
ロー成形することにより、表２に示すように、底面中央
最下部の肉厚が２．３０〜６．２０ｍｍであり、底面中
央最下部の高さが６ｍｍであり、かつ脚部における接地
面の肉厚が０．２５〜１．１０ｍｍ、同じく接地面の密
度が１．３７０ｇ／ｃｍ3 であり，図１〜３に示すよう
なボトルを成形した。[Experimental Examples 7 to 12] PET 95K
g, PEN (5 kg) is stirred and mixed, and then a preform is formed by injection molding, and the preform is blow-molded in a blow mold having a body mold temperature of 85 ° C and a bottom mold temperature of 130 ° C. Thus, as shown in Table 2, the thickness of the bottom bottom center bottom is 2.30 to 6.20 mm, the height of the bottom bottom center bottom is 6 mm, and the ground contact surface thickness of the legs is 0. 0.25 to 1.10 mm, the density of the ground contact surface was 1.370 g / cm 3 , and a bottle as shown in FIGS.
【００２７】上記方法により得られたＰＥＴボトルにつ
き、成形性および加熱処理後外観を評価した結果を表２
に示す。The PET bottles obtained by the above method were evaluated for moldability and appearance after heat treatment.
Shown in
【００２８】[0028]
【表２】 表２から明らかなように、ＰＥＮが５重量％であって
も、底面中央最下部の肉厚が２．３０ｍｍ、脚部におけ
る接地面の肉厚が０．２５ｍｍと薄い実験例７のものは
耐熱性が不十分であり、熱処理すると脚部が変形し、自
立性が失われ、また底面中央最下部の肉厚が６．２０ｍ
ｍ、脚部における接地面の肉厚が１．１０ｍｍと厚い実
験例１２のものでは、成形性に幾分劣るものであった。[Table 2] As is clear from Table 2, even if PEN is 5% by weight, the thickness of the bottom center lowermost portion is 2.30 mm, and the thickness of the grounding surface of the leg is 0.25 mm. Insufficient heat resistance, heat treatment deforms legs, loses self-supporting property, and the thickness of the bottom bottom center is 6.20 m
In Experimental Example 12, in which the thickness of the ground contact surface of the leg portion was 1.10 mm, which was large, the moldability was somewhat inferior.
【００２９】一方、底面中央最下部の肉厚が２．５０〜
５．８０ｍｍであり、かつ脚部における接地面の肉厚が
０．３０〜０．７６ｍｍの範囲の実験例８〜１１のもの
は、成形性も良好であるとともに、加熱殺菌処理を行っ
た場合でも、ほとんど変形しないか、少々変形しても自
立性は保たれ、耐熱・耐圧性に優れる好ましいものであ
った。On the other hand, the thickness of the bottom bottom center is 2.50.
In the case of Experimental Examples 8 to 11 in which the thickness of the ground contact surface in the legs is in the range of 0.30 to 0.76 mm, the moldability is good, and heat sterilization treatment is performed. However, it is preferable that it is hardly deformed, or even if it is slightly deformed, the self-sustaining property is maintained and the heat resistance and pressure resistance are excellent.
【００３０】［実験例１３〜１８］ ＰＥＴ ９５Ｋ
ｇ、ＰＥＮ ５Ｋｇを攪拌混合した後、射出成形により
予備成形品を成形し、これを胴部金型温度が８５℃であ
り、表３に示すように、底型温度が９０℃〜１８０℃で
あるブロー金型内においてブロー成形することにより、
底面中央最下部の肉厚が３．０ｍｍであり、底面中央最
下部の高さが６ｍｍであり、かつ脚部における接地面の
肉厚が０．３５ｍｍ、同じく接地面の密度が表３に示す
ように、１．３６０ｇ／ｃｍ3 〜１．３８０ｇ／ｃｍ3
であり、図１〜３に示すようなボトルを成形した。[Experimental Examples 13 to 18] PET 95K
g and PEN (5 kg) were mixed by stirring, and then a preform was molded by injection molding. The temperature of the body mold was 85 ° C, and the bottom mold temperature was 90 ° C to 180 ° C as shown in Table 3. By blow molding in a blow mold,
The bottom center bottom has a thickness of 3.0 mm, the bottom center bottom has a height of 6 mm, and the legs have a grounding surface thickness of 0.35 mm. So that 1.360 g / cm 3 to 1.380 g / cm 3
That is, a bottle as shown in FIGS.
【００３１】上記方法により得られたＰＥＴボトルにつ
き、成形性および加熱処理後外観を評価した結果を表３
に示す。The PET bottles obtained by the above method were evaluated for moldability and appearance after heat treatment.
Shown in
【００３２】[0032]
【表３】 表３から明らかなように、底型温度が９０℃と低く接地
面の密度が１．３６０ｇ／ｃｍ3 と小さい実験例１３で
は、耐熱性が不十分であり、熱処理すると脚部が変形
し、自立性が失われ、また底型温度が１８０℃と高温で
接地面の密度が１．３８０ｇ／ｃｍ3 と大きい実験例１
８のものは成形性に劣るものであった。[Table 3] As is clear from Table 3, in Experimental Example 13 in which the temperature of the bottom mold is as low as 90 ° C. and the density of the contact surface is as small as 1.360 g / cm 3 , the heat resistance is insufficient, and the legs are deformed by heat treatment, Experimental example 1 in which the self-supporting property was lost, and the bottom surface temperature was as high as 180 ° C. and the density of the contact surface was as large as 1.380 g / cm 3.
No. 8 was inferior in moldability.
【００３３】一方、底型温度が１１０℃〜１５０℃であ
るブロー金型内においてブロー成形することにより、接
地面の密度が表３に示すように、１．３６５ｇ／ｃｍ3
〜１．３７５ｇ／ｃｍ3 である実験例１４〜１７のもの
は、成形性も良好であるとともに、加熱殺菌処理を行っ
た場合でも、ほとんど変形しないか、少々変形しても自
立性は保たれ、耐熱・耐圧性に優れ、好ましいものであ
った。On the other hand, by performing blow molding in a blow mold having a bottom mold temperature of 110 ° C. to 150 ° C., the density of the ground contact surface is 1.365 g / cm 3 as shown in Table 3.
The experimental examples 14 to 17 having an amount of ˜1.375 g / cm 3 have good moldability, and even when subjected to a heat sterilization treatment, they are hardly deformed or their self-sustaining property is maintained even if they are slightly deformed. It was excellent in heat resistance and pressure resistance and was preferable.
【００３４】［実験例１９〜２４］ ＰＥＴ ９５Ｋ
ｇ、ＰＥＮ ５Ｋｇを攪拌混合した後、射出成形により
予備成形品を成形し、これを胴部金型温度が８５℃であ
り、底型温度が１３０℃であるブロー金型内においてブ
ロー成形することにより、底面中央最下部の肉厚が３．
０ｍｍであり、底面中央最下部の高さが表４に示すよう
に、３〜２５ｍｍであり、かつ脚部における接地面の肉
厚が０．３５ｍｍ、同じく接地面の密度が１．３７０ｇ
／ｃｍ3 であり、図１〜３に示すようなボトルを成形し
た。[Experimental Examples 19 to 24] PET 95K
g, PEN (5 kg) is stirred and mixed, and then a preform is formed by injection molding, and the preform is blow-molded in a blow mold having a body mold temperature of 85 ° C and a bottom mold temperature of 130 ° C. As a result, the wall thickness at the bottom bottom center is 3.
0 mm, the height of the bottom bottom center is 3 to 25 mm, as shown in Table 4, the thickness of the ground surface of the leg is 0.35 mm, and the density of the ground surface is 1.370 g.
/ Cm 3 , and a bottle as shown in FIGS. 1 to 3 was molded.
【００３５】上記方法により得られたＰＥＴボトルにつ
き、成形性および加熱処理後外観を評価した結果を表４
に示す。The PET bottles obtained by the above method were evaluated for moldability and appearance after heat treatment.
Shown in
【００３６】[0036]
【表４】 表４から明らかなように、底面中央最下部の高さが、３
ｍｍと低い実験例１９では、耐熱性が不十分であり、熱
処理すると底面中央最下部が変形し、自立性が失われ、
また底面中央最下部の高さが２５ｍｍと大きい実験例２
４のものは成形性に劣るものであった。[Table 4] As is clear from Table 4, the height of the bottom bottom center is 3
In Experimental Example 19 having a low value of mm, the heat resistance was insufficient, and when heat-treated, the bottom center bottom part was deformed, and the self-supporting property was lost.
In addition, Experimental Example 2 in which the height at the bottom of the bottom center is as large as 25 mm
No. 4 was inferior in moldability.
【００３７】一方、底面中央最下部の高さが表４に示す
ように、４〜１８ｍｍである実験例２０〜２３のもの
は、成形性も良好であるとともに、加熱殺菌処理を行っ
た場合でも、ほとんど変形しないか、少々変形しても自
立性は保たれ、耐熱・耐圧性に優れ、好ましいものであ
った。On the other hand, as shown in Table 4, the heights of the lowermost part of the bottom center are 4 to 18 mm, and those of Experimental Examples 20 to 23 have good moldability and even when subjected to heat sterilization treatment. However, it is preferable that it is hardly deformed, or even if it is slightly deformed, the self-sustaining property is maintained and the heat resistance and pressure resistance are excellent.
【００３８】[0038]
【発明の効果】本発明は二軸延伸成形されたプラスチッ
クボトルにおいて、その底部が半球状曲面の底面から下
方に膨出させた複数の脚部を周方向に略等間隔で配置さ
れてあり、エチレンテレフタレート単位を９９〜９０モ
ル％およびエチレン−２，６−ナフタレート単位を１〜
１０モル％含有するポリエステルからなることを特徴と
する自立型ボトルであるから、成形性が良好であるとと
もに炭酸飲料を充填し、加熱殺菌処理を行った場合にお
いても著しい変形を起こすことがない耐熱・耐圧性に優
れた自立型ボトルを得ることができる。According to the present invention, in a biaxially stretch-molded plastic bottle, a plurality of legs, the bottom of which is bulged downward from the bottom surface of a hemispherical curved surface, are arranged at substantially equal intervals in the circumferential direction, 99 to 90 mol% of ethylene terephthalate units and 1 to 1 of ethylene-2,6-naphthalate units.
Since it is a self-supporting bottle characterized by being made of polyester containing 10 mol%, it has good moldability and does not cause significant deformation even when it is filled with a carbonated beverage and subjected to heat sterilization treatment.・ It is possible to obtain a self-supporting bottle with excellent pressure resistance.
【図１】本発明による耐熱・耐圧性ボトルの例を示す全
体正面図FIG. 1 is an overall front view showing an example of a heat and pressure resistant bottle according to the present invention.
【図２】図１における底部の拡大断面図FIG. 2 is an enlarged cross-sectional view of the bottom portion in FIG.
【図３】本発明による耐熱・耐圧性ボトルの例を示す底
面図FIG. 3 is a bottom view showing an example of a heat-resistant and pressure-resistant bottle according to the present invention.
１ 底部 １０ 底面中央最下部 １１ 底面 ２ 脚部 ２１ 脚部接地面 1 Bottom 10 Bottom Bottom Central Bottom 11 Bottom 2 Leg 21 Leg Grounding Surface
Claims (5)
ルにおいて、その底部が半球状曲面の底面から下方に膨
出させた複数の脚部を周方向に略等間隔で配置されてあ
り、エチレンテレフタレート単位を９９〜９０モル％お
よびエチレン−２，６−ナフタレート単位を１〜１０モ
ル％含有するポリエステルからなることを特徴とする自
立型ボトル。1. A biaxially stretch-molded plastic bottle has a plurality of legs whose bottoms bulge downward from the bottom surface of a hemispherical curved surface and are arranged at substantially equal intervals in the circumferential direction. A self-supporting bottle comprising a polyester containing 99 to 90 mol% of ethylene and 1 to 10 mol% of an ethylene-2,6-naphthalate unit.
フタレート９９〜９０重量％およびポリエチレンナフタ
レート１〜１０重量％からなる混合物であることを特徴
とする請求項１記載の自立型ボトル。2. The self-supporting bottle according to claim 1, wherein the polyester is a mixture of 99 to 90% by weight of polyethylene terephthalate and 1 to 10% by weight of polyethylene naphthalate.
〜６．０ｍｍの範囲であり、前記脚部の接地面の肉厚が
０．３〜０．８ｍｍの範囲であることを特徴とする請求
項１または請求項２記載の自立型ボトル。3. The wall thickness of the bottom center portion of the bottom surface is 2.5.
3. The self-supporting bottle according to claim 1 or 2, wherein the thickness of the ground contact surface of the legs is in the range of 0.3 to 0.8 mm.
１．３６５〜１．３７５ｇ／ｃｍ3 の範囲となるように
前記底部が熱処理されてあることを特徴とする請求項１
または請求項２または請求項３記載の自立型ボトル。4. The bottom portion is heat-treated so that the density of at least the ground contact surface of the leg portion is in the range of 1.365 to 1.375 g / cm 3.
Alternatively, the self-supporting bottle according to claim 2 or claim 3.
下部までの高さが４．０〜２０ｍｍの範囲であることを
特徴とする請求項１または請求項２または請求項３また
は請求項４記載の自立型ボトル。5. The height from the ground contact surface of the leg portion to the lowermost portion of the bottom surface center is in the range of 4.0 to 20 mm, claim 1 or claim 2 or claim 3 or claim 5. The self-supporting bottle described in 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24467695A JPH0986528A (en) | 1995-09-22 | 1995-09-22 | Self-sustained bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24467695A JPH0986528A (en) | 1995-09-22 | 1995-09-22 | Self-sustained bottle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0986528A true JPH0986528A (en) | 1997-03-31 |
Family
ID=17122298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24467695A Pending JPH0986528A (en) | 1995-09-22 | 1995-09-22 | Self-sustained bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0986528A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999001508A1 (en) * | 1997-07-04 | 1999-01-14 | Mitsubishi Plastics, Inc. | Polyester resin composition and bottle produced from the resin composition |
| FR2784081A1 (en) * | 1998-10-06 | 2000-04-07 | Oreal | Gas-propelled aerosol dispenser has spherical container of thermoplastic material with vitreous transition temperature above 80 deg C |
| JP2012162287A (en) * | 2011-02-04 | 2012-08-30 | Dainippon Printing Co Ltd | Plastic bottle |
| JP2012162290A (en) * | 2011-02-04 | 2012-08-30 | Dainippon Printing Co Ltd | Plastic bottle |
-
1995
- 1995-09-22 JP JP24467695A patent/JPH0986528A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999001508A1 (en) * | 1997-07-04 | 1999-01-14 | Mitsubishi Plastics, Inc. | Polyester resin composition and bottle produced from the resin composition |
| EP0926197A1 (en) * | 1997-07-04 | 1999-06-30 | Mitsubishi Plastics Inc. | Polyester resin composition and bottle produced from the resin composition |
| EP0926197A4 (en) * | 1997-07-04 | 2002-02-06 | Mitsubishi Plastics Inc | Polyester resin composition and bottle produced from the resin composition |
| FR2784081A1 (en) * | 1998-10-06 | 2000-04-07 | Oreal | Gas-propelled aerosol dispenser has spherical container of thermoplastic material with vitreous transition temperature above 80 deg C |
| EP0995697A1 (en) * | 1998-10-06 | 2000-04-26 | L'oreal | Spherical plastic aerosol |
| JP2012162287A (en) * | 2011-02-04 | 2012-08-30 | Dainippon Printing Co Ltd | Plastic bottle |
| JP2012162290A (en) * | 2011-02-04 | 2012-08-30 | Dainippon Printing Co Ltd | Plastic bottle |
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