JPH07257537A - Heat and pressure resistant vessel and production method - Google Patents

Heat and pressure resistant vessel and production method

Info

Publication number
JPH07257537A
JPH07257537A JP7817894A JP7817894A JPH07257537A JP H07257537 A JPH07257537 A JP H07257537A JP 7817894 A JP7817894 A JP 7817894A JP 7817894 A JP7817894 A JP 7817894A JP H07257537 A JPH07257537 A JP H07257537A
Authority
JP
Japan
Prior art keywords
heat
blow
container
parison
molded
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
Application number
JP7817894A
Other languages
Japanese (ja)
Inventor
Kaneo Yamada
務夫 山田
Kazuhisa Nakai
和久 中井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP7817894A priority Critical patent/JPH07257537A/en
Publication of JPH07257537A publication Critical patent/JPH07257537A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D1/00Containers 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
    • B65D1/02Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6418Heating of preforms
    • B29C49/642Heating of preforms and shrinking of the preform
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6472Heating or cooling preforms, parisons or blown articles in several stages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/0715Preforms or parisons characterised by their configuration the preform having one end closed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06Injection blow-moulding

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To provide a producing method of a biaxially orientated blow-molded plastic vessel which is excellent in heat and pressure resistance and design. CONSTITUTION:A plastic parison 20 composed of the opening 21, the body 22 and the bottom 23 is made and molded by orientation blow molding in the state that a part corresponding to the upper part of the vessel body in the parison 20 is retained in a temperature higher by 0-20 deg.C than other parts. In this way, the upper part and the lower part have almost the same thickness and a primary blow-molding 30 having the lower part with a larger diameter than the diameter of the upper part is formed. Next, the lower part and the bottom of the primary blow-molding are contracted at 130-200 deg.C and the obtained contracted molding is again treated by orientation blow-molding to produce a heat and pressure resistant vessel with an aimed shape.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は耐圧性に優れたプラスチ
ック製二軸延伸ブロー成形容器、及びそれを製造する方
法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic biaxially stretch blow molded container having excellent pressure resistance and a method for producing the same.

【0002】[0002]

【従来の技術及び発明が解決しようとする課題】ポリエ
チレンテレフタレートにより代表される飽和ポリエステ
ル樹脂等からなる二軸延伸ブロー成形ボトルは、極めて
優れた透明性及び表面光沢を有し、美麗で、ガスバリヤ
ー性、水分不透過性、耐内容物性及び保存性等に優れて
いる。また、燃焼時の発熱も少なく、炉をいためること
もないため易廃棄性である等、多くの利点を有してい
る。そのため、各種飲料水、調味料、酒類その他の食品
用の容器(ボトル)等に広く用いられている。
BACKGROUND OF THE INVENTION Biaxially stretched blow molded bottles made of saturated polyester resin represented by polyethylene terephthalate have excellent transparency and surface gloss, and are beautiful and have a gas barrier. Excellent in water resistance, moisture impermeability, content resistance and storage stability. In addition, it has many advantages such as low heat generation during combustion and easy disposal because it does not damage the furnace. Therefore, it is widely used in containers (bottles) for various drinking water, seasonings, alcoholic beverages and other foods.

【0003】近年、この二軸延伸ブロー成形によるポリ
エステル製容器に、80〜95℃に保ったジュース等の液体
を充填するいわゆるホットフィルや、60〜80℃のホット
シャワーによるパステライジングが行われるようにな
り、耐熱性だけでなく、液体の充填時と冷却時との温度
差に起因する圧力など、耐圧性に優れたボトルが要求さ
れるようになった。また、このような二軸延伸ブロー成
形によるポリエステル製容器は、大容量化が進んでお
り、2リットルを超す容量の大型ボトルも製造されるよ
うになってきており、内容物の重量に起因する圧力に対
する耐性も必要とされる。このような内部圧力は、炭酸
飲料を充填物とした時に特に顕著である。
In recent years, so-called hot fill for filling a liquid such as juice kept at 80 to 95 ° C. or pasteurizing by hot shower at 60 to 80 ° C. is performed in a polyester container made by this biaxial stretch blow molding. Therefore, not only heat resistance but also pressure resistance due to the pressure caused by the temperature difference between the time of filling the liquid and the time of cooling has been demanded. Further, the capacity of polyester containers made by such biaxially stretch blow molding has been increasing, and large bottles having a capacity of more than 2 liters have been manufactured, which is caused by the weight of the contents. Resistance to pressure is also required. Such an internal pressure is particularly remarkable when a carbonated beverage is used as the filling material.

【0004】また、このようなポリエステル製容器にお
いては、デザインの多様化、個性化、差別化を目的とし
て、また容器の自立性を付与する目的として、ポリエス
テル製容器の胴部の下部や底部の壁面に凹凸を形成する
ことにより、意匠性や機能性を向上させることが行われ
ている。しかしながら、容器の壁面に凹凸を形成する
と、その部分の肉厚が薄くなるため、耐熱圧性が低下す
るとともにクリープ変形も受けやすく、胴部の下部及び
底部が大きく膨出するおそれがあるという問題がある。
特に、容器の胴部や底部が内側に凹面となっている場合
や、鞍部面を形成する場合にはその膨出が著しい。
Further, in such a polyester container, for the purpose of diversifying, individualizing and differentiating the design, and for imparting the self-supporting property of the container, the lower part and the bottom part of the body part of the polyester container are By forming irregularities on the wall surface, design and functionality are improved. However, when unevenness is formed on the wall surface of the container, the wall thickness of that portion becomes thin, so that the heat and pressure resistance is reduced and creep deformation is likely to occur, and there is a possibility that the lower part and the bottom part of the body part may largely swell. is there.
In particular, when the body or bottom of the container is concave inward, or when the saddle surface is formed, the bulging is remarkable.

【0005】従って本発明の目的は、耐熱圧性に優れた
意匠性に富んだプラスチック製二軸延伸ブロー成形容器
を提供することである。
Therefore, an object of the present invention is to provide a plastic biaxially stretch blow molded container which is excellent in heat resistance and pressure resistance and which is rich in design.

【0006】また、本発明のもう一つの目的は、上記容
器を製造する方法を提供することである。
Another object of the present invention is to provide a method for manufacturing the above container.

【0007】[0007]

【課題を解決するための手段】上記目的に鑑み鋭意研究
の結果、本発明者は、容器胴部の下部及び底部を胴部の
上部よりも厚肉とした二軸延伸ブロー成形容器は、耐熱
圧性及び耐クリープ変形性に優れているが、そのような
形状の容器は、単一の二軸延伸ブロー成形工程では形成
することができず、パリソンの胴部の上部を他の部分よ
り0〜20℃高い温度に設定した状態で、胴部の下部が上
部より大きな径となるようにブロー成形することによ
り、容器胴部の肉厚がほぼ均一な1次ブロー成形体を製
造し、この1次ブロー成形体の下部及び底部を加熱収縮
させた後、再度二軸延伸ブロー成形することにより製造
することができることを見出した。以上の発見に基づき
本発明に想到した。
As a result of earnest research in view of the above object, the present inventors have found that a biaxially stretch blow-molded container in which the lower part and the bottom part of the container body are thicker than the upper part of the body part is heat resistant. Although excellent in pressure resistance and creep deformation resistance, a container having such a shape cannot be formed by a single biaxial stretch blow molding process, and the upper part of the parison body is more than 0 parts than other parts. With the temperature set at 20 ° C higher, blow molding is performed so that the lower part of the body has a larger diameter than the upper part to produce a primary blow-molded product with a substantially uniform wall thickness of the container. It has been found that the subsequent blow-molded product can be manufactured by shrinking the lower part and the bottom part by heating and then biaxially stretching blow-molding again. The present invention has been made based on the above findings.

【0008】すなわち、本発明の耐圧容器は、口部、肩
部、胴部及び底部からなるものであって、前記胴部の下
部及び底部が前記胴部の上部よりも厚肉であることを特
徴とする。
That is, the pressure resistant container of the present invention comprises a mouth portion, a shoulder portion, a body portion and a bottom portion, and the lower portion and the bottom portion of the body portion are thicker than the upper portion of the body portion. Characterize.

【0009】また、上記耐圧容器を製造する本発明の方
法は、(a) 口部、胴部及び底部からなるプラスチック製
のパリソンを作成し、(b) 前記パリソンにおける前記容
器の胴部の上部に相当する部分を他の部分より0〜20℃
高い温度に保持した状態で前記パリソンを延伸ブロー成
形することにより、前記上部と前記下部の肉厚がほぼ等
しくて、前記下部の径が前記上部より大きな1次ブロー
成形体を形成し、(c) 前記1次ブロー成形体の下部及び
底部を130 〜200 ℃で収縮させ、(d) 前記(c) で得られ
た収縮成形体を再度延伸ブロー成形することにより目的
形状とすることを特徴とする。
The method of the present invention for producing the pressure-resistant container comprises: (a) forming a plastic parison having a mouth portion, a body portion and a bottom portion, and (b) an upper portion of the body portion of the container in the parison. The part corresponding to
Stretch blow molding of the parison in a state of being kept at a high temperature forms a primary blow molded body in which the upper portion and the lower portion have substantially the same wall thickness and the lower portion has a diameter larger than that of the upper portion. ) The lower part and the bottom part of the primary blow-molded product are shrunk at 130 to 200 ° C., and (d) the shrink-molded product obtained in (c) is stretch-blow-molded again to obtain a target shape. To do.

【0010】以下本発明を詳細に説明する。〔1〕樹脂成分 まず本発明の耐熱圧容器を構成する樹脂について説明す
る。
The present invention will be described in detail below. [1] Resin Component First, the resin constituting the heat resistant pressure container of the present invention will be described.

【0011】本発明の二軸延伸ブロー成形耐熱圧容器を
構成する樹脂としては、ポリエステル樹脂が好適であ
る。ポリエステル樹脂としては、飽和ジカルボン酸と飽
和二価アルコールとからなる熱可塑性樹脂が使用でき
る。飽和ジカルボン酸としては、テレフタル酸、イソフ
タル酸、フタル酸、ナフタレン-1,4- 又は2,6-ジカルボ
ン酸、ジフェニルエーテル-4,4′- ジカルボン酸、ジフ
ェニルジカルボン酸類、ジフェノキシエタンジエタンジ
カルボン酸類等の芳香族ジカルボン酸類、アジピン酸、
セバチン酸、アゼライン酸、デカン-1,10-ジカルボン酸
等の脂肪族ジカルボン酸、シクロヘキサンジカルボン酸
等の脂環族ジカルボン酸等を使用することができる。ま
た飽和二価アルコールとしては、エチレングリコール、
プロピレングリコール、トリメチレングリコール、テト
ラメチレングリコール、ジエチレングリコール、ポリエ
チレングリコール、ポリプロピレングリコール、ポリテ
トラメチレングリコール、ヘキサメチレングリコール、
ドデカメチレングリコール、ネオペンチルグリコール等
の脂肪族グリコール類、シクロヘキサンジメタノール等
の脂環族グリコール、2,2-ビス(4′- β- ヒドロキシエ
トキシフェニル)プロパン、その他の芳香族ジオール類
等を使用することができる。好ましいポリエステルは、
テレフタル酸とエチレングリコールとからなるポリエチ
レンテレフタレートである。
A polyester resin is suitable as a resin constituting the biaxially stretch blow molded heat resistant pressure container of the present invention. As the polyester resin, a thermoplastic resin composed of saturated dicarboxylic acid and saturated dihydric alcohol can be used. Saturated dicarboxylic acids include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-1,4- or 2,6-dicarboxylic acid, diphenyl ether-4,4'-dicarboxylic acid, diphenyldicarboxylic acids, diphenoxyethanediethanedicarboxylic acids Aromatic dicarboxylic acids such as adipic acid,
Aliphatic dicarboxylic acids such as sebacic acid, azelaic acid and decane-1,10-dicarboxylic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid can be used. Further, as the saturated dihydric alcohol, ethylene glycol,
Propylene glycol, trimethylene glycol, tetramethylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, hexamethylene glycol,
Uses aliphatic glycols such as dodecamethylene glycol and neopentyl glycol, alicyclic glycols such as cyclohexanedimethanol, 2,2-bis (4'-β-hydroxyethoxyphenyl) propane, and other aromatic diols can do. The preferred polyester is
Polyethylene terephthalate composed of terephthalic acid and ethylene glycol.

【0012】本発明に用いるポリエスル樹脂は、固有粘
度が0.5 〜1.5 、好ましくは0.55〜0.8 の範囲の値を有
する。またこのようなポリエステルは、溶融重合で製造
され、 180〜250 ℃の温度下で減圧処理または不活性ガ
ス雰囲気で熱処理されたもの、または固相重合して低分
子量重合物であるオリゴマーやアセトアルデヒドの含有
量を低減させたものが好適である。
The polyester resin used in the present invention has an intrinsic viscosity in the range of 0.5 to 1.5, preferably 0.55 to 0.8. Further, such polyesters are produced by melt polymerization and subjected to a reduced pressure treatment or a heat treatment in an inert gas atmosphere at a temperature of 180 to 250 ° C., or a low molecular weight oligomer or acetaldehyde of a low molecular weight polymer obtained by solid state polymerization. Those with a reduced content are preferable.

【0013】また本発明においては、口部等の特に耐熱
性を要求される部分を、上述したポリエステルと、耐熱
性樹脂との多層構造とすることができる。上記耐熱性樹
脂としては、ポリアリレート、ポリカーボネート、ポリ
エチレンナフタレート、ポリアセタール、ポリサルフォ
ン、ポリエーテルエーテルケトン、ポリエーテルサルフ
ォン、ポリエーテルイミド、ポリフェニレンサルファイ
ド及びこれらの樹脂とポリエチレンテレフタレートとの
ブレンドポリマー、及び上記耐熱性樹脂間のブレンドポ
リマー、さらには上記耐熱性樹脂の2種以上の樹脂とポ
リエチレンテレフタレートとのブレンドポリマー、Uポ
リマー(ユニチカ製、ポリアリレートとポリエチレンテ
レフタレートのブレンドポリマー)、J320(三井石油化
学工業(株)製、ポリアリレートとポリカーボネートと
ポリエチレンテレフタレートとのブレンドポリマー)等
を使用し得る。好ましくはUポリマーを使用する。
Further, in the present invention, a portion such as a mouth portion, which is particularly required to have heat resistance, may have a multilayer structure of the above-mentioned polyester and heat resistant resin. Examples of the heat-resistant resin include polyarylate, polycarbonate, polyethylene naphthalate, polyacetal, polysulfone, polyether ether ketone, polyether sulfone, polyetherimide, polyphenylene sulfide, and a blend polymer of these resins and polyethylene terephthalate, and the above. Blend polymer between heat resistant resins, further blend polymer of two or more kinds of the above heat resistant resins with polyethylene terephthalate, U polymer (Unitika, blend polymer of polyarylate and polyethylene terephthalate), J320 (Mitsui Petrochemical Industry) (A blended polymer of polyarylate, polycarbonate and polyethylene terephthalate manufactured by K.K.) can be used. U polymers are preferably used.

【0014】なお本発明で使用するポリエステル樹脂及
び耐熱性樹脂中には、安定剤、顔料、酸化防止剤、熱劣
化防止剤、紫外線劣化防止剤、帯電防止剤、抗菌剤等の
添加剤やその他の樹脂等を適量加えることができる。
In the polyester resin and heat-resistant resin used in the present invention, additives such as stabilizers, pigments, antioxidants, heat deterioration inhibitors, ultraviolet deterioration inhibitors, antistatic agents, antibacterial agents, etc. An appropriate amount of the resin or the like can be added.

【0015】〔2〕耐熱圧容器 本発明の耐熱圧容器は、図1に例示するように口部11
と、肩部12と、胴部13と、底部14とからなる。この胴部
13は、肉厚(T1 ) の薄い上部13aと、それよりも厚肉
(T2 ) の下部13bとからなる。また、底部14も下部13
bとほぼ同じ肉厚を有する。T2 はT1 よりも50〜200
%大きいのが好ましい。本発明の耐熱圧容器は、このよ
うな構造を有するため、内容物の重量や内圧によりクリ
ープ変形しにくいだけでなく、耐熱圧性が極めて良好で
ある。
[2] Heat-resistant pressure container The heat-resistant pressure container of the present invention has a mouth portion 11 as illustrated in FIG.
And a shoulder portion 12, a body portion 13, and a bottom portion 14. This torso
13 includes an upper portion 13a having a thin wall thickness (T 1 ) and a lower portion 13b having a thinner wall thickness (T 2 ). In addition, the bottom 14 is also the bottom 13
It has almost the same thickness as b. T 2 is 50 to 200 than T 1
% Is preferable. Since the heat and pressure resistant container of the present invention has such a structure, not only is it difficult to undergo creep deformation due to the weight of the contents and the internal pressure, but also the heat and pressure resistant property is extremely good.

【0016】〔3〕製造方法 (a) パリソンの製造 図2は、本発明に使用することができるパリソンの一例
を概略的に示す断面図である図2に示すパリソン20は、
サポートリング24を有する口部21と、実質的に円筒状の
胴部22と、底部23とからなる。パリソン20の胴部22及び
底部23の肉厚は実質的に同じでよい。このパリソン20
は、上述したポリエステル樹脂を射出成形することによ
り形成することができる。
[3] Production Method (a) Production of Parison FIG. 2 is a sectional view schematically showing an example of the parison that can be used in the present invention. The parison 20 shown in FIG.
It comprises a mouth portion 21 having a support ring 24, a substantially cylindrical body portion 22, and a bottom portion 23. The thickness of the body portion 22 and the bottom portion 23 of the parison 20 may be substantially the same. This parison 20
Can be formed by injection molding the above-mentioned polyester resin.

【0017】(b) 1次ブロー成形体の製造 パリソン20の1次ブロー成形に際しては、口部以外の全
体を90〜110 ℃に加熱するとともに、上部22aをそれ以
外の部分よりも0〜30℃、好ましくは3〜10℃高い温度
に保持する。これにより、1次延伸ブロー成形におい
て、上部22aを下部22bより延伸を先行させることによ
りも縦方向に高い延伸倍率とすることができる。
(B) Manufacture of Primary Blow Molded Body At the time of primary blow molding of the parison 20, the entire body except the mouth is heated to 90 to 110 ° C., and the upper portion 22a is heated to 0 to 30 more than other portions. The temperature is kept at ℃, preferably 3 to 10 ℃ higher. Accordingly, in the primary stretch blow molding, by stretching the upper portion 22a ahead of the lower portion 22b, it is possible to obtain a high stretch ratio in the longitudinal direction.

【0018】このパリソン20を二軸延伸ブロー成形して
図3に示す1次ブロー成形体30を得るために、上部32a
よりも下部32bの方が径が大きいキャビティ型を用い
る。上述した温度に保ったパリソン20の1次二軸延伸ブ
ロー成形法自体は、通常の方法により行うことができ
る。このようにして得られた1次ブロー成形体30の下部
32b及び底部33の径は、上部32aの径よりも大きい。1
次二軸延伸ブロー成形では、延伸倍率(表面積倍率で表
す)を6〜15倍とするのが好ましい。
The parison 20 is biaxially stretch blow molded to obtain the primary blow molded body 30 shown in FIG.
A cavity mold having a larger diameter in the lower portion 32b is used. The primary biaxial stretching blow molding method itself of the parison 20 kept at the above-mentioned temperature can be performed by a usual method. The lower part of the primary blow-molded body 30 thus obtained
The diameter of 32b and the bottom portion 33 is larger than the diameter of the upper portion 32a. 1
In the secondary biaxial stretching blow molding, the stretching ratio (expressed by surface area ratio) is preferably 6 to 15 times.

【0019】上述したようにパリソンの胴部上部22aを
相対的に高温に保持しているので、延伸ロッドの降下に
より縦方向により多く延伸される。そこで、上記形状の
1次ブロー成形型で二軸延伸ブロー成形すると、下部32
b及び底部33の径は上記32aより大きくなる。このよう
に上部32aは縦方向の延伸倍率を大きくし、下部32bは
径方向の延伸倍率を大きくすることで、両者の表面積倍
率で表した延伸倍率をほぼ等しくし、もって1次ブロー
成形体の胴部の上部及び下部及び底部の肉厚(T3 、T
4 ) をほぼ等しくすることができる。
As described above, since the upper part 22a of the parison body is kept at a relatively high temperature, the draw rod is lowered to draw more in the longitudinal direction. Therefore, when biaxial stretch blow molding is performed using the primary blow molding die having the above-mentioned shape, the lower part 32
The diameters of b and the bottom portion 33 are larger than 32a. In this way, the upper part 32a has a larger stretching ratio in the longitudinal direction, and the lower part 32b has a larger stretching ratio in the radial direction. Thickness of the upper and lower parts of the body and the bottom (T 3 , T
4 ) can be made almost equal.

【0020】(c) 収縮成形体の製造 次に、上述のようにして得られた1次ブロー成形体の下
部32b及び底部33をガラス転移点以上の温度、好ましく
は130 〜200 ℃に加熱し、図4に示すように胴部下部32
b及び底部33(点線で示す)は42b及び43(実線で示
す)まで収縮する。このようにして得られた収縮成形体
40では、胴部42aの肉厚T3 ' はT3 とほとんど変わら
ないが、下部42b及び底部43の肉厚T 4' はT 4より非
常大きくなっている(好ましくは0.5 〜3倍)。このと
き1次ブロー成形体内の圧力は徐々に下げるのが好まし
い。
(C) Manufacture of Shrinkage Molded Product Next, the lower part 32b and the bottom part 33 of the primary blow-molded product obtained as described above are heated to a temperature not lower than the glass transition point, preferably 130 to 200 ° C. , The lower part of the body 32 as shown in FIG.
b and bottom 33 (shown in dotted lines) contract to 42b and 43 (shown in solid lines). Shrinkage molded article obtained in this way
In 40, the wall thickness T 3 ′ of the body portion 42a is almost the same as T 3 , but the wall thickness T 4 ′ of the lower portion 42b and the bottom portion 43 is much larger than T 4 (preferably 0.5 to 3 times). At this time, it is preferable that the pressure in the primary blow-molded body is gradually reduced.

【0021】(d) 二次延伸ブロー成形 続いて、図5に例示するように、この収縮成形体40(図
中の破線)を再度二軸延伸ブロー成形して目的とする耐
熱圧容器50を製造する。この2次二軸延伸ブロー成形で
は、最終製品の形状のキャビティを有する金型を用いる
以外、通常の条件により行うことができる。収縮成形体
40の温度は全体的にほぼ均一でよい。二次ブロー成形に
より、胴部上部42aはほとんど変化がないので、その最
終肉厚T1 はT3 ' とほとんど変わらない。一方下部42
b及び底部43は、再度大きく延伸されるので、それらの
肉厚は、T 4' からT2 に大きく減少する(好ましくは
1/2〜1/5)。これにより、T1 /T2 は2/3〜
1/2の範囲となる。
(D) Secondary Stretch Blow Molding Subsequently, as illustrated in FIG. 5, the shrink-molded body 40 (broken line in the figure) is biaxially stretch-blow molded again to form the target heat-resistant pressure container 50. To manufacture. This secondary biaxial stretch blow molding can be performed under normal conditions, except that a mold having a cavity having the shape of the final product is used. Shrink molding
The temperature at 40 may be generally uniform throughout. Due to the secondary blow molding, the upper portion 42a of the body portion hardly changes, so that the final wall thickness T 1 thereof is almost the same as T 3 ′. Meanwhile lower part 42
Since b and the bottom 43 are stretched again again, their wall thickness is greatly reduced from T 4 ′ to T 2 (preferably 1/2 to 1/5). As a result, T 1 / T 2 2/3
It becomes the range of 1/2.

【0022】なお、本実施例においては、耐熱圧容器50
の胴部の上部及び下部の壁面にそれぞれ凹凸を有する
が、この凹凸は、1次ブロー成形時及び/又は2次ブロ
ー成形時に形成することができる。特に、胴部の上部で
は1次ブロー成形時と2次ブロー成形時とで、寸法の変
化があまりないので、いずれのブロー成形時に形成して
もよいが、下部は、大幅な寸法変化を伴うので、2次ブ
ロー成形時に凹凸を形成するのが好ましい。
In this embodiment, the heat-resistant pressure container 50
The upper and lower wall surfaces of the body part have irregularities, which can be formed during primary blow molding and / or secondary blow molding. In particular, the upper part of the body does not change much in dimension between the primary blow molding and the secondary blow molding, so it may be formed in any of the blow moldings, but the lower part involves a large dimensional change. Therefore, it is preferable to form irregularities during the secondary blow molding.

【0023】以上、本発明を添付図面を参照して説明し
てきたが、本発明は、これに限定されず、例えば、パリ
ソンは単層成形体でなくとも多層成形体であってもよ
く、本発明の思想を逸脱しない限り種々の応用が可能で
ある。
Although the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to this. For example, the parison may be a multi-layer molded product instead of a single-layer molded product. Various applications are possible without departing from the idea of the invention.

【0024】[0024]

【実施例】本発明を以下の実施例によりさらに詳細に説
明する。
The present invention will be described in more detail by the following examples.

【0025】実施例1 結晶性プラスチックとしてポリエチレンテレフタレート
樹脂(三井PETJ125 (三井石油化学工業(株)製)
を用いて、射出成形法により図2に示すパリソンを成形
した。
Example 1 Polyethylene terephthalate resin (Mitsui PETJ125 (manufactured by Mitsui Petrochemical Industry Co., Ltd.) as a crystalline plastic
Was used to mold the parison shown in FIG. 2 by the injection molding method.

【0026】このパリソンの胴部の上部を110 ℃に、そ
れ以外の部分を100 ℃に加熱保持した後、二軸延伸ブロ
ー成形法により図3に示す形状の1次ブロー成形体を製
造した。この時の延伸倍率は表面積倍率で11倍であっ
た。なお、このときの1次ブロー成形型温度は胴部上部
が40〜60℃で、その他の部分が50〜60℃とした。
After the upper part of the body of this parison was heated and held at 110 ° C. and the other parts at 100 ° C., a primary blow-molded product having the shape shown in FIG. 3 was manufactured by the biaxial stretch blow molding method. The draw ratio at this time was 11 times in terms of surface area ratio. The temperature of the primary blow molding die at this time was 40 to 60 ° C in the upper part of the body and 50 to 60 ° C in the other parts.

【0027】次に、この1次ブロー成形体を胴部の下部
及び底部を130 〜160 ℃に、それ以外の部分を100 ℃に
加熱保持しながら内部を減圧して上部を20%、下部及び
底部を約200 %収縮させた。
Next, the primary blow-molded body was depressurized while heating and holding the lower part and the bottom part of the body at 130 to 160 ° C and the other parts at 100 ° C, and the upper part 20%, the lower part and the lower part. The bottom was shrunk approximately 200%.

【0028】この収縮成形体を最終容器形状に対応する
キャビティを有する2次ブロー成形型内に設置し、収縮
時の温度を保持した状態で2次延伸ブロー成形を行っ
た。このときの2次ブロー成形型の温度は100 〜140 ℃
とした。
This shrink-molded article was placed in a secondary blow-molding die having a cavity corresponding to the shape of the final container, and secondary stretch blow-molding was carried out while maintaining the temperature at the time of shrinkage. At this time, the temperature of the secondary blow mold is 100-140 ° C.
And

【0029】このようにして図1に示す形状の容器(容
量1.5 リットル)を得た。この容器の上部及び下部の肉
厚をそれぞれ測定したところ、上部が約0.4mm で、下部
及び底部が約0.8mm であった。また、この容器に炭酸飲
料をホットフィルしても変形は認められず、また7日間
放置しても変形は認められず、良好な耐熱圧性及び耐ク
リープ変形性を有することがわかる。
Thus, a container (capacity: 1.5 liter) having the shape shown in FIG. 1 was obtained. When the wall thicknesses of the upper part and the lower part of this container were measured, the upper part was about 0.4 mm and the lower part and the bottom part were about 0.8 mm. Further, no deformation was observed when hot filling a carbonated beverage in this container, and no deformation was observed even after standing for 7 days, which shows that it has good heat and pressure resistance and creep deformation resistance.

【0030】[0030]

【発明の効果】以上詳述した通り、本発明においては、
パリソンの胴部の上部を、他の部分よりも0〜20℃高い
温度に設定するとともに、胴部の下部及び底部が上部よ
りも大きな径となるように1次ブロー成形することによ
り、容器胴部の肉厚がほぼ均一な1次ブロー成形体を製
造し、この1次ブロー成形体の下部及び底部を加熱収縮
させた後、再度延伸ブロー成形しているので、得られる
二軸延伸ブロー成形容器の胴部下部及び底部が上部より
も肉厚となっている。このため、耐熱圧性及び耐クリー
プ変形性に優れている。
As described above in detail, in the present invention,
By setting the upper part of the parison body to a temperature 0 to 20 ° C higher than other parts and performing primary blow molding so that the lower part and bottom part of the parison have a larger diameter than the upper part, the container body Since a primary blow-molded product having a substantially uniform wall thickness is manufactured, and the lower part and bottom of the primary blow-molded product are heat-shrinked, stretch blow-molding is performed again, the resulting biaxial stretch blow-molded product is obtained. The bottom and bottom of the body of the container are thicker than the top. Therefore, it is excellent in heat resistance and pressure resistance and creep deformation resistance.

【0031】このような本発明の耐熱圧容器は、ホット
フィルやホットシャワーによるパステライジングを行う
ジュース等のボトルや、炭酸飲料、レトルト食品等の容
器に好適である。
The heat and pressure resistant container of the present invention as described above is suitable for a bottle of juice or the like which is pasteurized by hot fill or hot shower, a container of carbonated drink, retort food and the like.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の耐熱圧容器の一例を示す部分破断正面
図である。
FIG. 1 is a partially cutaway front view showing an example of a heat resistant pressure container of the present invention.

【図2】本発明に用いることができるパリソンの概略を
示す断面図である。
FIG. 2 is a sectional view schematically showing a parison that can be used in the present invention.

【図3】1次ブロー成形体を示す部分破断正面図であ
る。
FIG. 3 is a partially cutaway front view showing a primary blow-molded product.

【図4】加熱収縮体を示す部分破断正面図である。FIG. 4 is a partially cutaway front view showing a heat-shrinkable body.

【図5】加熱収縮成形体を再度二軸延伸ブロー成形する
状態を示す概略図である。
FIG. 5 is a schematic view showing a state where the heat-shrinkable molded body is biaxially stretch blow molded again.

【符号の説明】[Explanation of symbols]

1、50・・・耐熱圧容器 11、21、31・・・口部 12・・・肩部 13、22、32・・・胴部 13a、22a、32a・・・上部 14b、22b、32b・・・下部 14、23、33・・・底部 20・・・パリソン 24・・・サポートリング 30・・・1次ブロー成形体 40・・・収縮成形体 1, 50 ... Heat-resistant pressure container 11, 21, 31 ... Mouth 12 ... Shoulder 13, 22, 32 ... Body 13a, 22a, 32a ... Top 14b, 22b, 32b. ..Bottom parts 14, 23, 33 ... Bottom part 20 ... Parison 24 ... Support ring 30 ... Primary blow molded product 40 ... Shrink molded product

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 口部、肩部、胴部及び底部からなる耐熱
圧容器であって、前記胴部の下部及び底部が前記胴部の
上部よりも厚肉であることを特徴とする二軸延伸ブロー
成形耐熱圧容器。
1. A heat-resistant pressure container comprising a mouth portion, a shoulder portion, a body portion and a bottom portion, wherein the lower portion and the bottom portion of the body portion are thicker than the upper portion of the body portion. Stretch blow molded heat resistant pressure container.
【請求項2】 請求項1に記載の耐熱圧容器の製造方法
であって、(a) 口部、胴部及び底部からなるプラスチッ
ク製のパリソンを作成し、(b) 前記パリソンにおける前
記容器の胴部の上部に相当する部分を他の部分より0〜
20℃高い温度に保持した状態で前記パリソンを延伸ブロ
ー成形することにより、前記上部と前記下部の肉厚がほ
ぼ等しくて、前記下部の径が前記上部より大きな1次ブ
ロー成形体を形成し、(c) 前記1次ブロー成形体の下部
及び底部を130 〜200 ℃で収縮させ、(d) 前記(c) で得
られた収縮成形体を再度延伸ブロー成形することにより
目的形状とすることを特徴とする製造方法。
2. The method for manufacturing a heat and pressure resistant container according to claim 1, wherein (a) a plastic parison having a mouth portion, a body portion, and a bottom portion is formed, and (b) the container of the parison is formed. The part corresponding to the upper part of the body is 0 to more than other parts
Stretch-blow molding of the parison while maintaining the temperature at 20 ° C. higher forms a primary blow-molded body in which the upper portion and the lower portion have substantially the same wall thickness and the lower portion has a larger diameter than the upper portion, (c) The lower part and the bottom part of the primary blow-molded product are shrunk at 130 to 200 ° C., and (d) the shrink-molded product obtained in (c) is stretch-blow-molded again to obtain the target shape. Characteristic manufacturing method.
JP7817894A 1994-03-24 1994-03-24 Heat and pressure resistant vessel and production method Pending JPH07257537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7817894A JPH07257537A (en) 1994-03-24 1994-03-24 Heat and pressure resistant vessel and production method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7817894A JPH07257537A (en) 1994-03-24 1994-03-24 Heat and pressure resistant vessel and production method

Publications (1)

Publication Number Publication Date
JPH07257537A true JPH07257537A (en) 1995-10-09

Family

ID=13654718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7817894A Pending JPH07257537A (en) 1994-03-24 1994-03-24 Heat and pressure resistant vessel and production method

Country Status (1)

Country Link
JP (1) JPH07257537A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000094500A (en) * 1998-09-21 2000-04-04 Teijin Ltd Bottle and its manufacture
WO2012057090A1 (en) * 2010-10-25 2012-05-03 日精エー・エス・ビー機械株式会社 Production method for hollow container
JP2020044693A (en) * 2018-09-18 2020-03-26 東洋製罐株式会社 Synthetic resin container and manufacturing method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000094500A (en) * 1998-09-21 2000-04-04 Teijin Ltd Bottle and its manufacture
WO2012057090A1 (en) * 2010-10-25 2012-05-03 日精エー・エス・ビー機械株式会社 Production method for hollow container
JP2020044693A (en) * 2018-09-18 2020-03-26 東洋製罐株式会社 Synthetic resin container and manufacturing method thereof

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