JPH09290457A - Method for producing polyester bottle and polyester bottle - Google Patents
Method for producing polyester bottle and polyester bottleInfo
- Publication number
- JPH09290457A JPH09290457A JP10663396A JP10663396A JPH09290457A JP H09290457 A JPH09290457 A JP H09290457A JP 10663396 A JP10663396 A JP 10663396A JP 10663396 A JP10663396 A JP 10663396A JP H09290457 A JPH09290457 A JP H09290457A
- Authority
- JP
- Japan
- Prior art keywords
- bottle
- mold
- preform
- polyester
- temp
- 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
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
- B29C2049/4602—Blowing fluids
- B29C2049/4638—Blowing fluids being a hot gas, i.e. gas with a temperature higher than ambient temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0041—Crystalline
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポリエステルボト
ルの製造方法及びポリエステルボトルに関し、詳しく
は、耐熱性に優れ、外観も良好なポリエステルボトルに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester bottle manufacturing method and a polyester bottle, and more particularly to a polyester bottle having excellent heat resistance and good appearance.
【０００２】[0002]
【従来の技術】ポリエチレンテレフタレート（ＰＥＴ）
のような熱可塑性ポリエステルからなる二軸延伸ブロー
成形ボトルは、優れた透明性や表面光沢を有するととも
に、ボトルに必要な耐衝撃性，剛性，ガスバリア性をも
有しており、各種液体の瓶詰ボトルとして利用されてい
る。2. Description of the Related Art Polyethylene terephthalate (PET)
Biaxially stretched blow molded bottles made of thermoplastic polyester such as that have excellent transparency and surface gloss, as well as the impact resistance, rigidity and gas barrier properties required for bottles, and can be used for bottling of various liquids. It is used as a bottle.
【０００３】しかし、ポリエステルボトルは、耐熱性に
劣るという欠点があり、内容物を熱間充填する場合に
は、熱変形や容積の収縮変形を生じることがあった。特
に、把手付ボトルでは把手取付部の変形や収縮により把
手の取付け強度が低下することがある。However, the polyester bottle has a drawback that it is inferior in heat resistance, and when the contents are hot-filled, heat deformation or volume contraction deformation may occur. In particular, in a bottle with a handle, the attachment strength of the handle may be reduced due to the deformation or contraction of the handle attachment portion.
【０００４】このため、ポリエステルボトルを二軸延伸
ブロー成形した後、熱固定（ヒートセット）を行って耐
熱性を高めておく必要があるが、この熱固定の方法に
は、従来から多くの提案がなされており、例えば、高温
に加熱したブロー成形金型内で熱処理することにより、
耐熱性を向上させる方法が知られている。For this reason, it is necessary to heat-set (heat-set) the polyester bottle after biaxially stretch-blow molding to enhance heat resistance. However, many heat-setting methods have heretofore been proposed. Has been made, for example, by heat treatment in a blow molding die heated to a high temperature,
A method for improving heat resistance is known.
【０００５】[0005]
【発明が解決しようとする課題】上記高温の金型内での
熱固定は、工程数が少なく、装置コストも低いという利
点を有しており、工業的に優れた方法ではあるが、ブロ
ー成形後の熱固定とその後の冷却とのために比較的長い
型内滞留時間を必要とし、成形サイクルが長くなり、生
産速度が低いという問題があった。The heat fixation in the high temperature mold has the advantages of a small number of steps and a low apparatus cost, and is an industrially excellent method, but it is blow molding. There is a problem that a relatively long residence time in the mold is required for the subsequent heat setting and the subsequent cooling, the molding cycle becomes long, and the production rate is low.
【０００６】また、金型を高温にすればするほど熱固定
の効果は向上できるが、高温にするとボトルからオリゴ
マーが析出して金型に転着するため、得られるボトルの
外観が損なわれるだけでなく、その予防のために、定期
的に金型表面のオリゴマーを拭き取る必要があり、更に
生産性を低下させる要因となっていた。Further, the higher the temperature of the mold, the more the effect of heat fixation can be improved, but at the higher temperature, oligomers are precipitated from the bottle and transferred to the mold, so that the appearance of the obtained bottle is only impaired. However, in order to prevent this, it is necessary to periodically wipe off the oligomer on the surface of the mold, which is a factor that further reduces the productivity.
【０００７】さらに、把手付ボトルにおいては、金型を
高温にして熱固定する方法では、把手取付部のボトル壁
が把手と接しており、高温の金型とは接していないた
め、熱固定されず、結果として把手取付部に十分な耐熱
性を付与することができず、熱間充填時に収縮や変形を
生じ、把手の取付け強度が低下するという問題があっ
た。Further, in the case of a bottle with a handle, in the method in which the mold is heated to a high temperature and heat-set, the bottle wall of the handle mounting portion is in contact with the handle and is not in contact with the hot mold, so that the bottle is heat-set. As a result, there has been a problem that sufficient heat resistance cannot be imparted to the handle mounting portion, shrinkage or deformation occurs during hot filling, and the handle mounting strength decreases.
【０００８】そこで本発明は、耐熱性に優れるとともに
外観も良好なポリエステルボトルを低コストで提供する
ことを目的としている。Therefore, an object of the present invention is to provide a polyester bottle having excellent heat resistance and good appearance at low cost.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、本発明のポリエステルボトルの製造方法は、二軸延
伸ブロー成形によりポリエステルボトルを製造する方法
において、６０〜１２０℃の温度に維持された金型内
に、延伸可能な温度に加熱した熱可塑性ポリエステルの
プリフォームを装着し、該プリフォーム内に、１５０〜
５００℃の熱風を吹込み、軸方向及び周方向に二軸延伸
成形を行いつつ熱固定を行うことを特徴としている。In order to achieve the above object, the method for producing a polyester bottle of the present invention is a method for producing a polyester bottle by biaxial stretch blow molding, in which the temperature is maintained at 60 to 120 ° C. A thermoplastic polyester preform heated to a temperature at which it can be stretched is mounted in a mold, and 150 to
It is characterized in that hot air is blown at 500 ° C. to perform heat setting while performing biaxial stretch molding in the axial direction and the circumferential direction.
【００１０】また、本発明のポリエステルボトルは、上
記方法により得られた、首部，肩部，胴部及び底部から
なるポリエステルボトルであって、該ボトルの首部及び
底部以外の部分が透明で、かつ、２７％以上の結晶化度
を有していること、さらに、首部及び首部から肩部にか
けての範囲と底部とを除いた胴部において、その少なく
とも一部は、内面の平均屈折率が１．５９０以上であ
り、かつ、外面の平均屈折率より０．００１以上高いこ
とを特徴としている。Further, the polyester bottle of the present invention is a polyester bottle obtained by the above method and comprising a neck portion, a shoulder portion, a body portion and a bottom portion, the portion other than the neck portion and the bottom portion being transparent, and , 27% or more of crystallinity, and in the body except for the neck and the range from the neck to the shoulder and the bottom, at least a part of the inner surface has an average refractive index of 1. It is characterized by being 590 or more and 0.001 or more higher than the average refractive index of the outer surface.
【００１１】[0011]
【発明の実施の形態】以下、本発明を、図面を参照して
さらに詳細に説明する。図１は把手付ポリエステルボト
ルの正面図、図２はポリエステルボトルを二軸延伸ブロ
ー成形する金型の断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view of a polyester bottle with a handle, and FIG. 2 is a sectional view of a mold for biaxially stretch-blowing the polyester bottle.
【００１２】本形態例に示す把手付ポリエステルボトル
１は、首部２，肩部３，胴部４及び底部５からなるもの
で、胴部壁面に設けた凹部６に、別に成形した把手７を
ブロー成形時に一体的に嵌着したものである。The polyester bottle with a handle 1 shown in this embodiment comprises a neck portion 2, a shoulder portion 3, a body portion 4 and a bottom portion 5, and a separately formed handle 7 is blown into a concave portion 6 provided on the wall surface of the body portion. It is integrally fitted at the time of molding.
【００１３】把手付ポリエステルボトル１の原料となる
熱可塑性ポリエステルとしては、ポリエチレンテレフタ
レートが好適に使用されるが、ポリエチレンテレフタレ
ートボトルの特性及び本発明の要旨を損なわない範囲
で、すなわち、１０モル％以下の範囲内で、共重合成分
として、イソフタル酸、ｐ−β−オキシエトキシ安息香
酸、ナフタレン２，６−ジカルボン酸、ジフェノキシエ
タン−４，４−ジカルボン酸、５−ナトリウムスルホイ
ソフタル酸、アジピン酸、セバシン酸、又はこれらのア
ルキルエステル誘導体等のジカルボン酸成分、プロピレ
ングリコール、１，４−ブタジオール、ネオペンチルグ
リコール、１，６−ヘキシレングリコール、シクロヘキ
サンジメタノール、ビスフェノールＡのエチレンオキシ
ド付加物等のグリコール成分を含有するコポリエステル
等も使用することができる。さらに、このポリエステル
には、顔料，染料等の着色剤、紫外線吸収剤、帯電防止
剤等の添加物を添加することもできる。Polyethylene terephthalate is preferably used as the thermoplastic polyester as the raw material of the polyester bottle 1 with a handle, but within the range not impairing the characteristics of the polyethylene terephthalate bottle and the gist of the present invention, that is, 10 mol% or less. Within the range of, as the copolymerization component, isophthalic acid, p-β-oxyethoxybenzoic acid, naphthalene 2,6-dicarboxylic acid, diphenoxyethane-4,4-dicarboxylic acid, 5-sodium sulfoisophthalic acid, adipic acid. , Dicarboxylic acid components such as sebacic acid or alkyl ester derivatives thereof, propylene glycol, 1,4-butadiol, neopentyl glycol, 1,6-hexylene glycol, cyclohexanedimethanol, and glycols such as ethylene oxide adducts of bisphenol A. Copolyesters such as containing Le component can also be used. Further, additives such as colorants such as pigments and dyes, ultraviolet absorbers and antistatic agents can be added to the polyester.
【００１４】このような熱可塑性ポリエステルを用いて
把手付ポリエステルボトル１を製造する際には、まず、
射出成形によりプリフォーム（パリソン）１１と称する
非結晶の中空円筒有底状の成形品を製造する。次に、こ
のプリフォーム１１を延伸可能な温度まで加熱した後、
一対の金型１２ａ，１２ｂ及び底部金型１２ｃからなる
ブロー成形金型１２の所定位置に装着するとともに、あ
らかじめ別途成形した把手も金型内の所定位置にセット
する（図示せず）。続いて、延伸ロッド１３でプリフォ
ーム１１を軸方向に延伸するとともに、プリフォーム１
１内に高圧ガス（ブローエアー）を吹込んで周方向に延
伸し、金型内面形状に対応したボトルを成形する。When manufacturing a polyester bottle with a handle 1 using such a thermoplastic polyester, first,
An amorphous hollow cylindrical bottomed molded product called a preform (parison) 11 is manufactured by injection molding. Next, after heating this preform 11 to a temperature at which it can be stretched,
The blow molding die 12 including the pair of dies 12a and 12b and the bottom die 12c is mounted at a predetermined position, and a handle separately molded in advance is also set at a predetermined position in the mold (not shown). Then, the preform 11 is stretched in the axial direction by the stretching rod 13, and the preform 1
A high-pressure gas (blow air) is blown into 1 and stretched in the circumferential direction to mold a bottle corresponding to the inner surface shape of the mold.
【００１５】そして、上述のブロー成形において、本発
明では、前記ブロー成形金型１２の温度を６０〜１２０
℃の範囲、好ましくは８０〜１１０℃の範囲とし、プリ
フォーム１１内に吹込むブローエアーの温度を１５０〜
５００℃、好ましくは１８０〜４００℃の温度の熱風と
する。In the blow molding described above, in the present invention, the temperature of the blow molding die 12 is 60 to 120.
C., preferably in the range of 80 to 110.degree. C., and the temperature of the blow air blown into the preform 11 is 150.degree.
The hot air has a temperature of 500 ° C., preferably 180 to 400 ° C.
【００１６】前記ブロー成形金型１２においてブロー成
形と熱固定とを同時に行う場合は、耐熱性を付与する点
で、金型の温度をできるだけ高くすることが望ましい
が、生産性やボトルの取出しの点からは、金型の温度は
低くすることが望ましい。したがって、金型の温度範囲
は、ポリエステルの種類や分子配向及び熱固定の程度に
よって異なるが、最終成形品（ボトル）を実質的に非冷
却下でも変形無しに取出すことができる範囲で、できる
だけ高い温度に設定することが好ましい。When blow molding and heat setting are simultaneously performed in the blow molding die 12, it is desirable to raise the temperature of the die as high as possible from the viewpoint of imparting heat resistance. From the point of view, it is desirable to lower the mold temperature. Therefore, the temperature range of the mold varies depending on the type of polyester, the molecular orientation and the degree of heat setting, but is as high as possible as long as the final molded product (bottle) can be taken out without deformation even when it is substantially uncooled. It is preferable to set the temperature.
【００１７】一方、プリフォーム１１内に吹き込む熱風
の温度は、できるだけ高い方が熱固定には有利である
が、使用するポリエステルの性状や前記金型の温度、ブ
ローエアーの加熱に要するコスト等に応じて設定すれば
よい。また、熱風の導入量，導入時間は、所望の熱固定
を行える範囲で設定すればよく、熱風や金型の温度に応
じて適宜に設定することができる。On the other hand, it is advantageous for heat fixing that the temperature of the hot air blown into the preform 11 is as high as possible. However, the temperature of the polyester used, the temperature of the mold, the cost required to heat the blow air, etc. It may be set accordingly. Further, the introduction amount and the introduction time of the hot air may be set within a range in which desired heat fixation can be performed, and can be appropriately set according to the temperature of the hot air and the mold.
【００１８】すなわち、ボトルの熱固定を、吹込む熱風
の温度を１５０〜５００℃、特に１８０〜４００℃にし
て行うとともに、成形後のボトルを実質的に非冷却下で
取出し可能な６０〜１２０℃の範囲、好ましくは８０〜
１１０℃の温度に金型の温度を維持することにより、延
伸ブロー成形と熱固定とを同時に進行させることがで
き、さらに、成形サイクルにおける冷却時間をほとんど
必要とせずに、金型からボトルを取出すことができ、成
形サイクルの短縮、即ち製造速度の向上が図れる。That is, the bottle is heat-set at a temperature of hot air of 150 to 500 ° C., particularly 180 to 400 ° C., and the bottle after molding can be taken out substantially without cooling. ℃ range, preferably 80 ~
By maintaining the mold temperature at 110 ° C., stretch blow molding and heat setting can proceed at the same time, and the bottle is taken out from the mold with almost no cooling time required in the molding cycle. Therefore, the molding cycle can be shortened, that is, the manufacturing speed can be improved.
【００１９】さらに、金型の温度を、ボトルを実質的に
非冷却状態で取出し可能な比較的低い温度としたことに
より、ボトルからオリゴマーが析出することがなくなる
ので、従来のように、オリゴマーが金型に転着してボト
ルの外観を損なうことがなくなり、同時に、金型表面に
付着するオリゴマーを拭き取る必要がなくなるため、ボ
トルの外観を良好に保つことができるとともに、生産性
を大幅に向上させることができる。Furthermore, since the temperature of the mold is set to a relatively low temperature at which the bottle can be taken out in a substantially uncooled state, the oligomer is prevented from precipitating from the bottle. There is no need to transfer to the mold to impair the appearance of the bottle, and at the same time, it is not necessary to wipe off the oligomer adhering to the mold surface, so that the appearance of the bottle can be kept good and productivity is greatly improved. Can be made.
【００２０】また、把手付ボトルにおいては、ボトル内
部から熱固定することにより、高温金型による熱固定が
不可能であった把手取付部に対しても十分な熱固定がで
きるので、耐熱性を有する把手付ボトルを得ることがで
きる。Further, in the case of a bottle with a handle, heat fixing from the inside of the bottle allows sufficient heat setting even for a handle mounting portion which could not be heat set by a high temperature mold, and therefore has heat resistance. A bottle with a handle can be obtained.
【００２１】なお、前述の実質的に非冷却下とは、ボト
ルを金型から取出す際に内部の熱風を大気と置換する程
度の冷却は含んでいる。The term "substantially uncooled" includes cooling to the extent that the hot air inside the bottle is replaced with the atmosphere when the bottle is taken out of the mold.
【００２２】このようにしてポリエステルボトルを二軸
延伸ブロー成形することにより、耐熱性及び外観に優
れ、延伸倍率が低い把手取付部の強度も安定したポリエ
ステルボトルを効率よく製造することができる。By biaxially stretch-blow-molding the polyester bottle in this manner, it is possible to efficiently manufacture a polyester bottle having excellent heat resistance and appearance, and having a low draw ratio and stable grip attachment portion strength.
【００２３】そして、本発明のポリエステルボトルは、
少なくともボトルの首部２及び底部５以外の部分が透明
であって、かつ、２７％以上の結晶化度を有している。
このように、肩部３や胴部４を透明とし、結晶化度を２
７％以上にすることにより、耐熱性に優れるとともに外
観も良好なポリエステルボトルが得られる。The polyester bottle of the present invention is
At least the portion other than the neck portion 2 and the bottom portion 5 of the bottle is transparent and has a crystallinity of 27% or more.
In this way, the shoulder 3 and the body 4 are made transparent, and the crystallinity is 2
When it is 7% or more, a polyester bottle having excellent heat resistance and good appearance can be obtained.
【００２４】また、首部２及び首部２から肩部３にかけ
ての範囲と底部５とを除いた胴部４の少なくとも一部
を、内面の平均屈折率が１．５９０以上であり、かつ、
外面の平均屈折率より０．００１以上高くすることによ
り、上記同様に、耐熱性及び外観に優れたポリエステル
ボトルが得られる。The inner surface of at least a part of the body 4 excluding the neck 2 and the range from the neck 2 to the shoulder 3 and the bottom 5 has an average refractive index of 1.590 or more, and
By increasing the average refractive index of the outer surface by 0.001 or more, a polyester bottle excellent in heat resistance and appearance can be obtained in the same manner as above.
【００２５】[0025]
【実施例】以下、本発明の実施例及び比較例を説明す
る。ＩＶ（極限粘度数）が０．７６のポリエチレンテレ
フタレートを常法により射出成形し、首部を結晶化処理
した肉厚３．８ｍｍ，重量６０ｇのプリフォームを作成
した。このプリフォームを、１１０℃に予備加熱した
後、ブロー成形金型の所定位置に把手と共に装着し、延
伸ロッドとブローエアーとにより内容量１．５リットル
の把手付ポリエステルボトルを二軸延伸ブロー成形し、
次いでボトル内に上記ブローエアーを４秒間循環させた
後、大気を吹込んでボトル内の熱風を大気と置換してか
ら型を開いて取出した。EXAMPLES Examples and comparative examples of the present invention will be described below. A preform having a wall thickness of 3.8 mm and a weight of 60 g was prepared by injection-molding polyethylene terephthalate having an IV (intrinsic viscosity number) of 0.76 by a conventional method, and crystallizing the neck portion. After preheating this preform to 110 ° C., it is attached to a predetermined position of a blow molding die together with a handle, and a polyester bottle with a handle having an internal capacity of 1.5 liter is biaxially stretch blow molded by a stretching rod and blow air. Then
Then, after the blow air was circulated in the bottle for 4 seconds, the atmosphere was blown to replace the hot air in the bottle with the atmosphere, and then the mold was opened and taken out.
【００２６】表１に示すように、金型温度及びブローエ
アー温度を変えて６種類のボトルを製造し、各ボトルに
ついて、胴部の結晶化度及び内外両面の屈折率を測定す
るとともに、ボトルの耐熱性，把手の固定状態及び外観
を判定した。As shown in Table 1, six types of bottles were manufactured by changing the mold temperature and the blow air temperature, and the crystallinity of the body and the refractive index of both the inner and outer surfaces of each bottle were measured, and the bottles were also measured. The heat resistance, fixed state and appearance of the handle were evaluated.
【００２７】なお、原料樹脂のＩＶは、次のようにして
求めた。まず、採取したサンプル４００ｍｇをフェノー
ル・テトラクロロエタン混合溶媒（重量比１：１）４０
ｍｌに１２０℃で２０分間撹拌して溶解した後、得られ
た溶液の粘度を、３０℃の恒温水槽中でウベローデ型粘
度計により測定し、これから次式に従ってＩＶを算出し
た。The IV of the raw material resin was determined as follows. First, 400 mg of the collected sample was mixed with 40% phenol / tetrachloroethane mixed solvent (weight ratio 1: 1).
After stirring and dissolving in 120 ml at 120 ° C. for 20 minutes, the viscosity of the obtained solution was measured by an Ubbelohde viscometer in a constant temperature water bath at 30 ° C., and IV was calculated according to the following equation.
【００２８】 相対粘度 ηrel ＝ｔ／ｔ0 ｔ：溶液の落下時間［ｓｅｃ］ ｔ0 ：溶媒の落下時間［ｓｅｃ］ 比粘度 ηsp＝ηrel −１ ＩＶ η＝｛−１＋（１＋４・ｋ′・ηsp）1/2 ｝／（２・ｋ′・Ｃ） ｋ′：０．３３（ハギンスの恒数） Ｃ：１（溶液濃度）Relative viscosity η rel = t / t 0 t: falling time of solution [sec] t 0 : falling time of solvent [sec] Specific viscosity η sp = η rel −1 IV η = {− 1+ (1 + 4 · k ′ · Η sp ) 1/2 } / (2 · k ′ · C) k ′: 0.33 (Huggins constant) C: 1 (solution concentration)
【００２９】結晶化度は、ボトルの胴部中央から切り出
したサンプルを使用して次のようにして求めた。まず、
ｎ−ヘプタン−四塩化炭素系密度勾配管を作成し、２０
℃の条件下でサンプルの密度を求めた。得られた密度か
ら次式に従って結晶化度を算出した。The crystallinity was determined as follows using a sample cut from the center of the body of the bottle. First,
An n-heptane-carbon tetrachloride-based density gradient tube was prepared, and 20
The density of the sample was determined under the condition of ° C. The crystallinity was calculated from the obtained density according to the following formula.
【００３０】結晶化度 Ｘｃ＝｛（ρ−ρa ）／（ρc
−ρa ）｝×１００ ［％］ ρ：測定密度［ｇ／ｃｍ3 ］ ρa ：非晶密度［ｇ／ｃｍ3 ］ ρc ：結晶密度［ｇ／ｃｍ3 ］Crystallinity Xc = {(ρ-ρ a ) / (ρ c
−ρ a )} × 100 [%] ρ: measured density [g / cm 3 ] ρ a : amorphous density [g / cm 3 ] ρ c : crystal density [g / cm 3 ]
【００３１】平均屈折率は、ボトル胴部中央から切り出
したサンプルについて、ボトル外面側及び内面側の双方
をアッベの屈折計により３方向の屈折率（軸方向：
ｎAD、周方向：ｎHD、厚さ方向：ｎThD ）をそれぞれ読
取り、この３個の屈折率の平均値を平均屈折率（外面：
ｎO 、内面：ｎi ）とした。The average refractive index of the sample cut out from the center of the bottle body was measured by Abbe's refractometer on both the outer and inner surfaces of the bottle in three directions (axial direction:
n AD , circumferential direction: n HD , thickness direction: n ThD ) are read, and the average value of the three refractive indexes is average refractive index (outer surface:
n O, Inside: was n i).
【００３２】耐熱性は、得られた各ボトルに８５℃の温
水を充填し、水冷後に変形が認められなかったものを
「○」、少しでも変形していたときには「×」とした。
同時に、把手７の状態を判定し、確実な固定状態を維持
していたものには「○」、少しでもガタがあるものは
「×」とした。また、外観は、５００本連続して成形し
た後に採取したボトルを目視で判定し、表面光沢の良い
ものは「○」、表面光沢が損なわれているものを「×」
とした。Regarding the heat resistance, each of the obtained bottles was filled with warm water at 85 ° C., and no deformation was observed after cooling with water was “◯”, and when it was slightly deformed, it was “X”.
At the same time, the state of the handle 7 was judged, and "○" was given to those that maintained a reliable fixed state, and "X" was given to those that had some play. In addition, the appearance is judged by visually inspecting the bottles collected after continuously molding 500 bottles. Good ones with good surface gloss are "○", and those with impaired surface gloss are "x".
And
【００３３】[0033]
【表１】 [Table 1]
【００３４】[0034]
【発明の効果】以上説明したように、本発明によれば、
耐熱性が高く、外観も良好で、延伸倍率の低い把手取付
部の強度も安定している各種形状のポリエステルボトル
を提供することができ、その生産効率も大幅に向上させ
ることができる。As described above, according to the present invention,
It is possible to provide a polyester bottle having various shapes that has high heat resistance, a good appearance, and a stable grip attachment portion with a low draw ratio, and the production efficiency thereof can be significantly improved.
【図面の簡単な説明】[Brief description of drawings]
【図１】 把手付ポリエステルボトルの正面図である。FIG. 1 is a front view of a polyester bottle with a handle.
【図２】 ブロー成形金型の断面図である。FIG. 2 is a cross-sectional view of a blow molding die.
１…把手付ポリエステルボトル、２…首部、３…肩部、
４…胴部、５…底部、６…凹部、７…把手、１１…プリ
フォーム、１２…ブロー成形金型、１３…延伸ロッド1 ... Polyester bottle with handle, 2 ... Neck, 3 ... Shoulder,
4 ... Body, 5 ... Bottom, 6 ... Recess, 7 ... Handle, 11 ... Preform, 12 ... Blow molding die, 13 ... Stretch rod
Claims (3)
ボトルを製造する方法において、６０〜１２０℃の温度
に維持された金型内に、延伸可能な温度に加熱した熱可
塑性ポリエステルのプリフォームを装着し、該プリフォ
ーム内に、１５０〜５００℃の熱風を吹込み、軸方向及
び周方向に二軸延伸成形を行いつつ熱固定を行うことを
特徴とするポリエステルボトルの製造方法。1. A method for producing a polyester bottle by biaxial stretch blow molding, wherein a thermoplastic polyester preform heated to a stretchable temperature is mounted in a mold maintained at a temperature of 60 to 120 ° C. A method for producing a polyester bottle, characterized in that hot air of 150 to 500 ° C. is blown into the preform to perform heat setting while biaxially stretch-molding in the axial direction and the circumferential direction.
首部，肩部，胴部及び底部からなるポリエステルボトル
であって、該ボトルの首部及び底部以外の部分が透明
で、かつ、２７％以上の結晶化度を有していることを特
徴とするポリエステルボトル。2. Manufactured by the method according to claim 1,
A polyester bottle comprising a neck portion, a shoulder portion, a body portion and a bottom portion, wherein the portion other than the neck portion and the bottom portion of the bottle is transparent and has a crystallinity of 27% or more. Bottle.
二軸延伸し、かつ、熱固定することにより得られた、首
部，肩部，胴部及び底部からなるポリエステルボトルで
あって、該ボトルの首部及び首部から肩部にかけての範
囲と底部とを除いた胴部において、その少なくとも一部
は、内面の平均屈折率が１．５９０以上であり、かつ、
外面の平均屈折率より０．００１以上高いことを特徴と
するポリエステルボトル。3. A polyester bottle comprising a neck portion, a shoulder portion, a body portion and a bottom portion, which is obtained by biaxially stretching a thermoplastic polyester preform and thermally fixing the preform. In the body part excluding the range from the neck part to the shoulder part and the bottom part, at least a part thereof has an average inner surface refractive index of 1.590 or more, and
A polyester bottle having a refractive index of 0.001 or more higher than the average refractive index of the outer surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10663396A JPH09290457A (en) | 1996-04-26 | 1996-04-26 | Method for producing polyester bottle and polyester bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10663396A JPH09290457A (en) | 1996-04-26 | 1996-04-26 | Method for producing polyester bottle and polyester bottle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09290457A true JPH09290457A (en) | 1997-11-11 |
Family
ID=14438525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10663396A Pending JPH09290457A (en) | 1996-04-26 | 1996-04-26 | Method for producing polyester bottle and polyester bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09290457A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001019594A1 (en) * | 1999-09-14 | 2001-03-22 | Schmalbach-Lubeca Ag | Blow molding method and machine for producing pasteurizable containers |
| WO2001034370A1 (en) * | 1999-11-09 | 2001-05-17 | Schmalbach-Lubeca Ag | Blow molding method and machine for producing pasteurizable containers |
| WO2002002295A1 (en) * | 2000-06-30 | 2002-01-10 | Schmalbach-Lubeca Ag | Method for producing plastic containers having high crystallinity bases |
| WO2009001475A1 (en) * | 2007-06-26 | 2008-12-31 | Toyo Seikan Kaisha, Ltd. | Polyester bottle with resistance to heat and pressure and process for producing the same |
| JP2018135146A (en) * | 2017-02-23 | 2018-08-30 | 大日本印刷株式会社 | Aseptic filling method and aseptic filling equipment |
-
1996
- 1996-04-26 JP JP10663396A patent/JPH09290457A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001019594A1 (en) * | 1999-09-14 | 2001-03-22 | Schmalbach-Lubeca Ag | Blow molding method and machine for producing pasteurizable containers |
| WO2001034370A1 (en) * | 1999-11-09 | 2001-05-17 | Schmalbach-Lubeca Ag | Blow molding method and machine for producing pasteurizable containers |
| WO2002002295A1 (en) * | 2000-06-30 | 2002-01-10 | Schmalbach-Lubeca Ag | Method for producing plastic containers having high crystallinity bases |
| WO2009001475A1 (en) * | 2007-06-26 | 2008-12-31 | Toyo Seikan Kaisha, Ltd. | Polyester bottle with resistance to heat and pressure and process for producing the same |
| CN101808801A (en) * | 2007-06-26 | 2010-08-18 | 东洋制罐株式会社 | Polyester bottle with resistance to heat and pressure and process for producing the same |
| JPWO2009001475A1 (en) * | 2007-06-26 | 2010-08-26 | 東洋製罐株式会社 | Heat-resistant and pressure-resistant polyester bottle and method for producing the same |
| US8815354B2 (en) | 2007-06-26 | 2014-08-26 | Toyo Seikan Kaisha, Ltd. | Heat- and pressure-resistant polyester bottle and process for producing the same |
| JP2018135146A (en) * | 2017-02-23 | 2018-08-30 | 大日本印刷株式会社 | Aseptic filling method and aseptic filling equipment |
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