JP3763599B2 - Polyester bottle manufacturing method - Google Patents
Polyester bottle manufacturing method Download PDFInfo
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- JP3763599B2 JP3763599B2 JP24186195A JP24186195A JP3763599B2 JP 3763599 B2 JP3763599 B2 JP 3763599B2 JP 24186195 A JP24186195 A JP 24186195A JP 24186195 A JP24186195 A JP 24186195A JP 3763599 B2 JP3763599 B2 JP 3763599B2
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- 229920000728 polyester Polymers 0.000 title claims description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 9
- 230000008025 crystallization Effects 0.000 claims description 9
- 238000000071 blow moulding Methods 0.000 claims description 7
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 description 12
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Polyesters Or Polycarbonates (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、紫外線遮断性に優れかつ経時収縮の小さいポリエステルボトルの製造方法に関する。
【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と呼ぶことがある）で代表されるポリエステル樹脂からなるポリエステルボトルは、優れた透明性、表面光沢、耐衝撃性、剛性、ガスバリア性などの特性を生かして、各種食品等の容器として広く用いられている。
【０００３】
【発明が解決しようとする課題】
しかしポリエチレンテレフタレートは醸造酒、食用油を長期間包装するためには紫外線遮断性が不十分であり、また経時収縮、すなわち夏場の貯蔵や輸送の際に比較的長時間経過することにより、内容量が減少する現象が見られるという問題があった。
【０００４】
本発明は、上記問題を解決し、紫外線遮断性に優れかつ経時収縮の小さいポリエステルボトルの製造方法を提供するものである。
【０００５】
【課題を解決するための手段】
本発明は、エチレン−２，６−ナフタレート単位を１〜５モル％およびエチレンテレフタレート単位を９９〜９５モル％含有するポリエステルからなるプリフォームを、１１０℃より高温で、（低温結晶化温度−１０℃）以下の温度に加熱し、型内面温度を６０〜９０℃としたブロー成形型内でブロー延伸成形することを特徴とするポリエステルボトルの製造方法である。
【０００６】
本発明においては、エチレン−２，６−ナフタレート単位とエチレンテレフタレート単位の総量に対し、エチレン−２，６−ナフタレート単位を１〜５モル％、好ましくは１〜３モル％が必要とされる。
【０００７】
エチレン−２，６−ナフタレート単位が１モル％未満では紫外線遮断性が不十分であり、５モル％を越えると紫外線遮断性の改善効果は頭打ちとなり、ブロー延伸成形されたポリエステルボトルの透明性が悪化する。
【０００８】
本発明におけるポリエステルは、エチレン−２，６−ナフタレートを主たる構成単位とするポリエステル（以下ＰＥＮということがある）と、エチレンテレフタレートを主たる構成単位とするポリエステル（以下ＰＥＴということがある）とを溶融混合することにより得られる。
【０００９】
溶融混合する前のＰＥＮ、ＰＥＴはそれぞれの主たる構成単位以外の成分を５モル％以下の範囲で共重合させたものであっても良い。
【００１０】
また、本発明におけるポリエステルは、エチレン−２，６−ナフタレート単位とエチレンテレフタレート単位とを、エチレン−２，６−ナフタレート単位を１〜５モル％、好ましくは１〜３モル％の割合となるように共重合させることによっても得られる。
【００１１】
こうして得られる本発明におけるポリエステルは、固有粘度が０．５〜１．０、好ましくは０．６〜０．９の範囲にあり、通常の射出成形法によりプリフォームを得ることができる。
【００１２】
本発明においては、極めて小さな経時収縮を実現し、透明なポリエステルボトルを得るためにプリフォームを、１１０℃より高温で、（低温結晶化温度−１０℃）以下の温度に加熱する必要がある。
【００１３】
１１０℃以下では、後で示す経時収縮率が０．３％より大きくなり、一方、低温結晶化温度−１０℃よりも高温にすると、プリフォームが結晶化により白化を生ずるとともに軟化して精度良くブロー成形することが困難となる。
【００１４】
本発明においては、極めて小さな経時収縮を実現し、透明なポリエステルボトルを得るために、型内面温度を６０〜９０℃としたブロー成形型内でブロー延伸成形する必要がある。
【００１５】
型内面温度が６０℃より低いと、後で示す経時収縮率が０．３％より大きくなり、一方、型内面温度が９０℃を越えると、ブロー成形されたポリエステルボトルを、ブロー成形型から取り出す際に熱変形を生じ易いので上記範囲が必要である。
【００１６】
さらに、プリフォームを、従来より高めの１１０℃より高温で加熱すること、および、型内面温度が６０〜９０℃としたブロー成形型内でブロー延伸成形することにより、ブロー延伸時のプリフォーム壁が伸びやすくなるため、ブロー成形型へのなじみがよく型忠実なポリエステルボトル得られるばかりか、ブロー延伸成形と同時にブロー成形型内に装着された別体の取手などにプリフォーム壁を巻き付かせて取り付ける、いわゆるアウトサート成形がやりやすいという効果もある。
【００１７】
【発明の実施の形態】
本発明において、使用する物性値の測定方法は以下の通りである。
【００１８】
１）固有粘度
フェノール／テトラクロルエタンの５０／５０混合溶媒を用いて、３０℃で測定した。
【００１９】
２）紫外線遮断性
ボトルの胴部からサンプルを切り出し、日立製作所製２２８型分光光度計を用いて紫外線波長領域で光線透過率を測定し、０の部分を遮断波長とした。
【００２０】
３）プリフォーム温度
あらかじめ半割りにしたプリフォームを閉じ合わせた状態で加熱して、ブロー延伸する直前に、プリフォームの外側表面と、開いた内側表面とを赤外放射温度計で測定し、両者の平均値を求めた。
【００２１】
４）経時収縮率
ブロー延伸後のポリエステルボトルを２０℃、６０％ＲＨで２４時間保管した後、処理前満注容量（２０℃の水を使用）を測定し、その後４０℃、６０％ＲＨで７日間保管した後、処理後満注容量（２０℃の水を使用）を測定し、処理による満注容量の減少量を、処理前満注容量に対する百分率で表し、経時収縮率とした。
【００２２】
５」低温結晶化温度（Ｔｃｃ）
室温から１０℃/分で昇温し、結晶化による発熱ピーク温度を測定した。
【００２３】
６）ヘーズ
ボトル胴部からサンプルを切り出し、ヘーズメータにより測定した。
【００２４】
【実施例】
［実験例１〜６］
固有粘度０．８４のポリエチレンテレフタレート及び固有粘度０．６４のポリエチレン−２，６−ナフタレートのチップを各々１７０℃で３時間熱風乾燥した後、ポリエチレン−２，６−ナフタレートが０〜７モル％となる範囲で両者を混合し、（株）日本製鋼所製のＴＥＸ３０Ｃ二軸押出機を用いてシリンダー設定温度２８０℃で溶融ブレンドの上、吐出後急冷し、固有粘度０．６８〜０．７４の実験例１〜６のブレンドチップを得た。
【００２５】
このブレンドチップを１７０℃で３時間熱風乾燥し、東芝機械（株）製ＩＳ−９０Ｂ射出成形機で重量６２ｇ、胴部外径３３ｍｍ、肉厚３．５ｍｍ、全長１５５ｍｍの有底プリフォームを得た。
【００２６】
この有底プリフォームを１０５℃（実験例２）、１２０℃（実験例１）に加熱し、型内に別体の取手を装着した、型面温度７０℃のブロー成形型内で、延伸棒により軸方向に延伸し、且つ２７ｋｇ／ｃｍ2 の内圧をかけて円周方向に延伸せしめ胴部外径１０５ｍｍ、全高３００ｍｍ、胴部肉厚が０．２〜０．４ｍｍ、内容量１．８リットルの取手付ボトルを得た。
【００２７】
これら取手付ボトルにつき、紫外線遮断性、経時収縮率、ヘーズを測定した結果を表１に示した。
【００２８】
【表１】
【００２９】
ポリエチレン−２，６−ナフタレートが１〜５モル％となる範囲で両者を混合した実験例３〜５では、紫外線遮断性が３６０〜３７０ｎｍ以下と向上し、経時収縮率も０．２２〜０．２６％と０．３％以下の優れたものであり、さらに実験例３〜５では、プリフォーム加熱温度が１０５℃と低温の実験例２よりも取手へのプリフォーム壁の巻き付きも良好であった。
【００３０】
ポリエチレン−２，６−ナフタレートが７モル％となるよう両者を混合した実験例６では、ヘーズが２．３と大きく透明性に劣るものであった。
【００３１】
［実験例７〜１１］
次に固有粘度０．８４のポリエチレンテレフタレート及び固有粘度０．６４のポリエチレン−２，６−ナフタレートのチップを各々１７０℃で３時間熱風乾燥した後、ポリエチレン−２，６−ナフタレートが３モル％となるよう両者を混合し、（株）日本製鋼所製のＴＥＸ３０Ｃ二軸押出機を用いてシリンダー設定温度２８０℃で溶融ブレンドの上、吐出後急冷し、固有粘度０．７の実験例７〜１２のチップを得た。
【００３２】
このブレンドチップを１７０℃で３時間熱風乾燥し、東芝機械（株）製ＩＳ−９０Ｂ射出成形機で重量６２ｇ、胴部外径３３ｍｍ、肉厚３．５ｍｍ、全長１５５ｍｍの有底プリフォームを得た。
【００３３】
この有底プリフォームを１０５℃、１１３℃、１２３℃に加熱し、型内に別体の取手を装着した、型面温度７０℃のブロー成形型内で、１２３℃に加熱し型面温度５５〜９５℃のブロー成形型内で、延伸棒により軸方向に延伸し、且つ２７ｋｇ／ｃｍ2 の内圧をかけて円周方向に延伸せしめ胴部外径１０５ｍｍ、全高３００ｍｍ、胴部肉厚が０．２〜０．４ｍｍ、内容量１．８リットルの取手付ボトルを得た。
【００３４】
これら取手付ボトルにつき、紫外線遮断性、ヘーズ、経時収縮率を測定した結果を表２に示した。
【００３５】
【表２】
【００３６】
プリフォーム加熱温度が１１３〜１２３℃で、型面温度７０℃のブロー成形型内で成形した実験例８、９のものは、紫外線遮断性が３７０ｎｍ以下と向上し、経時収縮率も０．２０〜０．２４％と０．３％以下の優れたものであり、さらに実験例８、９では、プリフォーム加熱温度が１０５℃と低温の実験例７よりも取手へのプリフォーム壁の巻き付きも良好であった。
【００３７】
しかし、プリフォーム加熱温度が１２３℃であっても、型面温度５５℃と低温のブロー成形型を用いた実験例１０は経時収縮率が０．４０と大きく、型面温度９５℃と高温のブロー成形型を用いた実験例１１は、ブロー成形型からボトルを取り出す時の熱変形が大きいものであった。
【００３８】
【発明の効果】
本発明はエチレン−２，６−ナフタレート単位を１〜５モル％およびエチレンテレフタレート単位を９９〜９５モル％含有するポリエステルからなるプリフォームを、１１０℃より高温で、（低温結晶化温度−１０℃）以下の温度に加熱し、型内面温度を６０〜９０℃としたブロー成形型内でブロー延伸成形することを特徴とするポリエステルボトルの製造方法であるので、紫外線遮断性に優れかつ経時収縮が小さく、また透明性も高いポリエステルボトルが得られ、取手を取り付ける場合には、取手へのプリフォーム壁の巻き付きが良好である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a polyester bottle having excellent ultraviolet blocking properties and small shrinkage over time.
[0002]
[Prior art]
Conventionally, a polyester bottle made of a polyester resin represented by polyethylene terephthalate (hereinafter sometimes simply referred to as PET) takes advantage of excellent properties such as transparency, surface gloss, impact resistance, rigidity, and gas barrier properties. It is widely used as a container for various foods.
[0003]
[Problems to be solved by the invention]
However, polyethylene terephthalate has insufficient UV-blocking properties for long-term packaging of brewed liquor and edible oil, and shrinks with time, i.e., a relatively long period of time during storage and transportation in summer, so There was a problem that the phenomenon of decrease was observed.
[0004]
The present invention solves the above problems and provides a method for producing a polyester bottle having excellent ultraviolet blocking properties and low shrinkage over time.
[0005]
[Means for Solving the Problems]
The present invention relates to a preform comprising a polyester containing 1 to 5 mol% of ethylene-2,6-naphthalate units and 99 to 95 mol% of ethylene terephthalate units at a temperature higher than 110 ° C. (low temperature crystallization temperature −10 C.) a polyester bottle manufacturing method, characterized by being blow-drawn and molded in a blow-molding mold heated to a temperature below or below and having a mold inner surface temperature of 60 to 90.degree.
[0006]
In the present invention, 1 to 5 mol%, preferably 1 to 3 mol% of ethylene-2,6-naphthalate units are required with respect to the total amount of ethylene-2,6-naphthalate units and ethylene terephthalate units.
[0007]
When the ethylene-2,6-naphthalate unit is less than 1 mol%, the ultraviolet blocking property is insufficient. When the ethylene-2,6-naphthalate unit is more than 5 mol%, the effect of improving the ultraviolet blocking property reaches its peak, and the transparency of the blow-stretched polyester bottle is low. Getting worse.
[0008]
The polyester in the present invention is a melt of a polyester having ethylene-2,6-naphthalate as a main structural unit (hereinafter sometimes referred to as PEN) and a polyester having ethylene terephthalate as a main structural unit (hereinafter sometimes referred to as PET). It is obtained by mixing.
[0009]
PEN and PET before being melt-mixed may be those obtained by copolymerizing components other than the main structural units in a range of 5 mol% or less.
[0010]
In the polyester of the present invention, the ethylene-2,6-naphthalate unit and the ethylene terephthalate unit are in a proportion of 1 to 5 mol%, preferably 1 to 3 mol% of the ethylene-2,6-naphthalate unit. It can also be obtained by copolymerization.
[0011]
The polyester in the present invention thus obtained has an intrinsic viscosity in the range of 0.5 to 1.0, preferably 0.6 to 0.9, and a preform can be obtained by an ordinary injection molding method.
[0012]
In the present invention, it is necessary to heat the preform at a temperature higher than 110 ° C. and lower than (low temperature crystallization temperature−10 ° C.) in order to achieve a very small shrinkage with time and obtain a transparent polyester bottle.
[0013]
Below 110 ° C., the shrinkage ratio with time will be larger than 0.3%. On the other hand, when the temperature is lower than the low temperature crystallization temperature −10 ° C., the preform is whitened by crystallization and softens with high accuracy. Blow molding becomes difficult.
[0014]
In the present invention, in order to achieve a very small shrinkage with time and to obtain a transparent polyester bottle, it is necessary to perform blow-stretching in a blow-molding die having a die inner surface temperature of 60 to 90 ° C.
[0015]
When the mold inner surface temperature is lower than 60 ° C., the shrinkage rate with time will be larger than 0.3%. On the other hand, when the mold inner surface temperature exceeds 90 ° C., the blow molded polyester bottle is taken out from the blow mold. In this case, the above range is necessary because thermal deformation easily occurs.
[0016]
Furthermore, the preform wall during blow-stretching is heated by heating the preform at a temperature higher than 110 ° C., which is higher than before, and by blow-stretching in a blow-molding die having a mold inner surface temperature of 60 to 90 ° C. This makes it easy to stretch, so that you can not only obtain a polyester bottle that fits well into the blow mold, but also wraps the preform wall around a separate handle attached in the blow mold simultaneously with blow-stretching. The so-called outsert molding is easy to do.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the physical property values used are measured as follows.
[0018]
1) It measured at 30 degreeC using the 50/50 mixed solvent of intrinsic viscosity phenol / tetrachloroethane.
[0019]
2) A sample was cut out from the body of the ultraviolet blocking bottle, the light transmittance was measured in the ultraviolet wavelength region using a Hitachi 228 type spectrophotometer, and the 0 portion was defined as the blocking wavelength.
[0020]
3) Preform temperature Heated in a state where the preforms were preliminarily closed, and immediately before blow-stretching, the outer surface of the preform and the opened inner surface were measured with an infrared radiation thermometer, The average value of both was obtained.
[0021]
4) Shrinkage ratio with time After the polyester bottle after blow stretching was stored at 20 ° C. and 60% RH for 24 hours, the pre-treatment full capacity (using 20 ° C. water) was measured, and then at 40 ° C. and 60% RH. After storage for 7 days, the full volume after treatment (using water at 20 ° C.) was measured, and the amount of decrease in the full volume due to treatment was expressed as a percentage of the full volume before treatment, which was defined as the shrinkage rate with time.
[0022]
5 ”Low temperature crystallization temperature (Tcc)
The temperature was raised from room temperature at 10 ° C./min, and the exothermic peak temperature due to crystallization was measured.
[0023]
6) A sample was cut out from the haze bottle body and measured with a haze meter.
[0024]
【Example】
[Experimental Examples 1-6]
Chips of polyethylene terephthalate having an intrinsic viscosity of 0.84 and polyethylene-2,6-naphthalate having an intrinsic viscosity of 0.64 were each dried with hot air at 170 ° C. for 3 hours, and then polyethylene-2,6-naphthalate was 0 to 7 mol%. Both are mixed within the range, and using a TEX30C twin screw extruder manufactured by Nippon Steel, Ltd., melt blending at a cylinder set temperature of 280 ° C., followed by rapid cooling after discharge, and an intrinsic viscosity of 0.68 to 0.74. Blend chips of Experimental Examples 1 to 6 were obtained.
[0025]
This blended chip was dried with hot air at 170 ° C. for 3 hours, and a bottomed preform having a weight of 62 g, a barrel outer diameter of 33 mm, a wall thickness of 3.5 mm, and a total length of 155 mm was obtained with an IS-90B injection molding machine manufactured by Toshiba Machine Co., Ltd. It was.
[0026]
This bottomed preform was heated to 105 ° C. (Experimental Example 2) and 120 ° C. (Experimental Example 1), and a draw bar was placed in a blow mold having a mold surface temperature of 70 ° C. with a separate handle in the mold. The body is stretched in the axial direction and stretched in the circumferential direction by applying an internal pressure of 27 kg / cm @ 2, the outer diameter of the barrel is 105 mm, the overall height is 300 mm, the thickness of the barrel is 0.2 to 0.4 mm, and the inner volume is 1.8 liters. A bottle with a handle was obtained.
[0027]
Table 1 shows the results of measurement of ultraviolet blocking property, shrinkage with time, and haze for these bottles with handles.
[0028]
[Table 1]
[0029]
In Experimental Examples 3 to 5, in which polyethylene-2,6-naphthalate was mixed in the range of 1 to 5 mol%, the ultraviolet blocking property was improved to 360 to 370 nm or less, and the shrinkage with time was also 0.22 to 0. 26% and 0.3% or less, and in Examples 3 to 5, the preform wall was wrapped around the handle better than in Example 2 where the preform heating temperature was 105 ° C. and low. It was.
[0030]
In Experimental Example 6 in which both were mixed so that polyethylene-2,6-naphthalate was 7 mol%, the haze was as large as 2.3 and the transparency was inferior.
[0031]
[Experimental Examples 7 to 11]
Next, chips of polyethylene terephthalate having an intrinsic viscosity of 0.84 and polyethylene-2,6-naphthalate having an intrinsic viscosity of 0.64 were each dried with hot air at 170 ° C. for 3 hours, and then polyethylene-2,6-naphthalate was 3 mol%. Both were mixed so that the mixture was melted and blended at a cylinder setting temperature of 280 ° C. using a TEX30C twin-screw extruder manufactured by Nippon Steel, Ltd., and rapidly cooled after discharge. Experimental Examples 7 to 12 having an intrinsic viscosity of 0.7 Got the chips.
[0032]
This blended chip was dried with hot air at 170 ° C. for 3 hours, and a bottomed preform having a weight of 62 g, a barrel outer diameter of 33 mm, a wall thickness of 3.5 mm, and a total length of 155 mm was obtained with an IS-90B injection molding machine manufactured by Toshiba Machine Co., Ltd. It was.
[0033]
This bottomed preform was heated to 105 ° C., 113 ° C., and 123 ° C., and was heated to 123 ° C. in a blow mold having a mold surface temperature of 70 ° C. with a separate handle attached to the mold, and the mold surface temperature was 55 ° C. In a blow mold of .about.95.degree. C., it is stretched in the axial direction by a stretching rod and stretched in the circumferential direction by applying an internal pressure of 27 kg / cm.sup.2, the barrel outer diameter is 105 mm, the total height is 300 mm, and the barrel thickness is 0.1. A bottle with a handle of 2 to 0.4 mm and an internal volume of 1.8 liters was obtained.
[0034]
Table 2 shows the results of measuring the ultraviolet blocking property, haze, and shrinkage with time for these bottles with handles.
[0035]
[Table 2]
[0036]
In Examples 8 and 9 molded in a blow mold having a preform heating temperature of 113 to 123 ° C. and a mold surface temperature of 70 ° C., the ultraviolet blocking property was improved to 370 nm or less, and the shrinkage ratio with time was 0.20. In addition, in Experimental Examples 8 and 9, the preform heating temperature is 105 ° C., and the preform wall is wrapped around the handle as compared with Experimental Example 7 at a low temperature. It was good.
[0037]
However, even if the preform heating temperature is 123 ° C., Experimental Example 10 using a low-temperature blow molding die with a mold surface temperature of 55 ° C. has a large shrinkage ratio with time of 0.40, and the mold surface temperature of 95 ° C. is high. In Experimental Example 11 using the blow mold, the thermal deformation when taking out the bottle from the blow mold was large.
[0038]
【The invention's effect】
The present invention relates to a preform comprising a polyester containing 1 to 5 mol% of ethylene-2,6-naphthalate units and 99 to 95 mol% of ethylene terephthalate units at a temperature higher than 110 ° C. (low temperature crystallization temperature −10 ° C. ) A polyester bottle manufacturing method characterized in that it is heated to the following temperature and blow-stretched in a blow mold with a mold inner surface temperature of 60-90 ° C. A small and highly transparent polyester bottle can be obtained, and when the handle is attached, the preform wall is well wrapped around the handle.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24186195A JP3763599B2 (en) | 1995-09-20 | 1995-09-20 | Polyester bottle manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24186195A JP3763599B2 (en) | 1995-09-20 | 1995-09-20 | Polyester bottle manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0976336A JPH0976336A (en) | 1997-03-25 |
| JP3763599B2 true JP3763599B2 (en) | 2006-04-05 |
Family
ID=17080618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24186195A Expired - Lifetime JP3763599B2 (en) | 1995-09-20 | 1995-09-20 | Polyester bottle manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3763599B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100226191B1 (en) * | 1997-04-03 | 1999-10-15 | 구광시 | Plastic bottles for drinks |
| JP4393004B2 (en) * | 2001-02-06 | 2010-01-06 | 三菱化学株式会社 | Polyester resin |
| BRPI0411557A (en) * | 2003-06-18 | 2006-08-01 | Coca Cola Campany | container prepared by a heat cured stretch blow molding process, and heat cured stretch blow molding processes to produce a container, and for hot filling a container |
| US7572493B2 (en) | 2005-05-11 | 2009-08-11 | The Coca-Cola Company | Low IV pet based copolymer preform with enhanced mechanical properties and cycle time, container made therewith and methods |
-
1995
- 1995-09-20 JP JP24186195A patent/JP3763599B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0976336A (en) | 1997-03-25 |
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