JPH01157828A - Heat-setting polyester orientation molding container - Google Patents
Heat-setting polyester orientation molding containerInfo
- Publication number
- JPH01157828A JPH01157828A JP63267173A JP26717388A JPH01157828A JP H01157828 A JPH01157828 A JP H01157828A JP 63267173 A JP63267173 A JP 63267173A JP 26717388 A JP26717388 A JP 26717388A JP H01157828 A JPH01157828 A JP H01157828A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- container
- temperature
- mold
- 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
Links
- 238000009998 heat setting Methods 0.000 title claims abstract description 23
- 229920000728 polyester Polymers 0.000 title claims abstract description 22
- 238000000465 moulding Methods 0.000 title abstract description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 16
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 16
- 238000000071 blow moulding Methods 0.000 claims abstract description 12
- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 10
- 230000014759 maintenance of location Effects 0.000 claims 1
- 230000009477 glass transition Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000137 annealing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 15
- 238000001816 cooling Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- XDODWINGEHBYRT-UHFFFAOYSA-N [2-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCCCC1CO XDODWINGEHBYRT-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
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
-
- 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
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
- B29C2049/7864—Temperature of the mould
- B29C2049/78645—Temperature of the mould characterised by temperature values or ranges
-
- 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
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
- B29C2049/7868—Temperature of the articles
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- 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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- 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
- B29C49/6604—Thermal conditioning of the blown article
- B29C49/6605—Heating the article, e.g. for hot fill
-
- 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
-
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、熱固定ポリエステル延伸成形容器に関し、よ
り詳細には、高温熱間充填または低温充填後加熱殺菌が
可能な熱固定ポリエステル延伸成形容器に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat-set polyester stretch-molded container, and more particularly, a heat-set polyester stretch-molded container that can be heat-sterilized after hot-filling or low-temperature filling. Regarding.
（従来の技術）
ポリエチレンテレフタレート（ＰＥＴ）の如き、熱可塑
性ポリエステルの二軸延伸ブロー成形容器は、優れた透
明性や表面光沢を有すると共に、びんに必要な耐衝撃性
、剛性、ガスバリヤ−性をも有しており、各種のびん詰
め容器として利用されている。(Prior Art) Biaxially stretched blow-molded containers made of thermoplastic polyester such as polyethylene terephthalate (PET) have excellent transparency and surface gloss, as well as the impact resistance, rigidity, and gas barrier properties necessary for bottles. It is also used as a variety of bottling containers.
しかしながら、ポリエステル容器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用途に対しては、熱
変形や容積の収縮変形を生じるため二軸延伸ブロー容器
を成形後に熱固定（ヒート・セット）すべく多くの提案
が既に行われている。However, polyester containers have the disadvantage of poor heat resistance, and when used to hot-fill the contents, heat deformation and volume shrinkage deformation occur. A number of proposals have already been made to
熱固定の方法には、特公昭６０−５６６０６号公報に見
られる通り、延伸ブロー成形により得られる成形品を成
形ブロー型から取出した後、熱固定用の金型内に保持し
て熱固定を行う方法や、特公昭５９−６２１６号公報に
見られる通り、ブロー成形型中で延伸ブロー成形と同時
に熱固定を行う方法が知られている。また、特開昭５７
−５３３２６号公報には、−次金型中で延伸ブロー成形
と同時に熱処理を行い、成形品を取出してこれを冷却す
ることなく、二次処理金型中でブロー成形する方法が記
載されている。As shown in Japanese Patent Publication No. 60-56606, the heat setting method involves taking out the molded product obtained by stretch blow molding from the blow mold, and then holding it in a heat setting mold to heat set it. There are known methods of carrying out heat setting at the same time as stretch blow molding in a blow mold, as shown in Japanese Patent Publication No. 59-6216. In addition, JP-A-57
Publication No. 53326 describes a method in which heat treatment is performed simultaneously with stretch blow molding in a secondary mold, and blow molding is performed in a secondary treatment mold without taking out the molded product and cooling it. .
（発明が解決しようとする問題点）
これらの熱固定法の内、単一の金型内で延伸ブロー成形
と同時に熱固定を行う方法は、装置コストが低く、操作
も簡便であるという利点があるが、単一の金型内で高温
での熱固定と成形体の取出しのための冷却とを行う必要
がある。このため、従来ワン・モールド熱固定法では、
延伸ブロー成形体の熱固定を比較的低温、例えば１３０
℃前後の温度で行い、熱固定後の成形体を十分に冷却し
た後、成形容器の取出しを行っている。(Problems to be Solved by the Invention) Among these heat setting methods, the method in which heat setting is performed simultaneously with stretch blow molding in a single mold has the advantages of low equipment cost and easy operation. However, it is necessary to perform heat setting at a high temperature and cooling for taking out the molded body within a single mold. For this reason, in the conventional one-mold heat setting method,
The stretch-blow molded body is heat-set at a relatively low temperature, e.g.
The molding is carried out at a temperature around 0.degree. C., and after the heat-fixed molded body has been sufficiently cooled, the molded container is taken out.
しかしながら、従来のワン・モールド熱固定法では、取
出された成形容器の器壁に残留歪があり、また熱固定の
温度も比較的低いことから、熱固定の効果（結晶化度）
も概して低く、得られる熱固定延伸成形容器の耐熱性や
寸法安定性においていまだ十分満足し得るものではなか
った。このため、この熱固定容器に内容物の熱間充填を
行うと、容器の最も重要な器壁胴部、特に容器の内容積
変化に追従するためのパネル部等に変形が生じるという
外観特性及び機能上の問題を生じる。However, in the conventional one-mold heat-setting method, there is residual strain on the wall of the molded container taken out, and the heat-setting temperature is relatively low, so the effect of heat-setting (crystallinity)
The heat resistance and dimensional stability of the resulting heat-set stretch-molded containers were still not fully satisfactory. For this reason, when this heat-fixed container is hot-filled with contents, the most important part of the container, the body, especially the panel part that follows the change in the container's internal volume, may be deformed due to its external appearance. Causes functional problems.
従って、本発明の目的は、高度の結晶化と同時に残留歪
の低減が行われていることによって、高い保形可能温度
を有する熱固定ポリエステル延伸容器を提供するにある
。Therefore, an object of the present invention is to provide a heat-set polyester stretched container which has a high shape-retention temperature due to a high degree of crystallization and a reduction in residual strain.
本発明の他の目的は、高温での熱間充填や低温充填後加
熱殺菌が可能である、耐熱性及び寸法安定性に優れた熱
固定ポリエステル延伸成形容器を提供するにある。Another object of the present invention is to provide a heat-set polyester stretch-molded container with excellent heat resistance and dimensional stability, which can be hot-filled at high temperatures or heat-sterilized after low-temperature filling.
Ｃ問題点を解決するための手段）
本発明によれば、ポリエチレンテレフタレートの二軸延
伸ブロー成形及び熱固定で形成された容器において、該
容器の胴部が３４％以上の結晶化度を有するように熱固
定され、該容器は７５乃至１２０℃の保形可能温度を有
することを特徴とする高温熱間充填または低温充填後加
熱殺菌が可能な熱固定ポリエステル延伸成形容器が提供
される。Means for Solving Problem C) According to the present invention, in a container formed by biaxial stretch blow molding and heat setting of polyethylene terephthalate, the body of the container has a crystallinity of 34% or more. Provided is a heat-set polyester stretch-molded container that can be heat-set at a high temperature or after low-temperature filling and heat sterilized, which is characterized in that the container has a shape-retainable temperature of 75 to 120°C.
（作 用）
本発明の熱固定ポリエステル延伸成形容器は、その胴部
が３４％以上の結晶化度を有し、且つ７５乃至１２０°
Ｃの保形温度を有することが特徴である。すなわち、こ
の容器の胴部は３４％以上という高い結晶化度を有する
と共に、高結晶化度への熱固定に際して生じやすい内部
歪を除去乃至低減させたことにより、７５乃至１２０℃
という保形可能温度を達成したものである。本明細書に
おいて保形可能温度とは、文言通りの意味、即ち、容器
の外形が変形することなく維持される温度を意味する。(Function) The heat-set polyester stretch-molded container of the present invention has a body having a crystallinity of 34% or more and a crystallinity of 75 to 120°.
It is characterized by having a shape-retaining temperature of C. In other words, the body of this container has a high degree of crystallinity of 34% or more, and by removing or reducing the internal strain that tends to occur during heat setting to a high crystallinity,
The shape-retaining temperature has been achieved. In this specification, the shape-retainable temperature means the literal meaning, that is, the temperature at which the outer shape of the container is maintained without deforming.
本発明の熱固定ポリエステル延伸成形容器は、ポリエチ
レンテレフタレートから成る有底プリフォームを、高温
、金型内で二軸延伸ブロー成形すると共に、得られる成
形体をこの金型内にて１３５℃以上の高温で熱固定し、
熱固定された成形体をその表面温度がポリエチレンテレ
フタレートのガラス転移点よりも高温でしかも実質上保
形可能な温度で金型より取出し、取出した成形体を放冷
雰囲気中でアニーリングして、成形体を自由収縮させる
ことにより製造される。The heat-set polyester stretch molded container of the present invention is produced by subjecting a bottomed preform made of polyethylene terephthalate to biaxial stretch blow molding in a mold at high temperature, and then molding the resulting molded product in the mold at a temperature of 135°C or higher. Heat set at high temperature,
The heat-set molded body is taken out from the mold when its surface temperature is higher than the glass transition point of polyethylene terephthalate and at a temperature that can substantially retain its shape, and the taken out molded body is annealed in an air-cooled atmosphere and molded. Manufactured by free contraction of the body.
熱固定温度は１３５℃以上であることが必要であり、１
４０乃至２３０℃の温度が好ましい。本明細書において
、熱固定温度とは、二軸延伸ブロー成形体が金型キャビ
ティ表面と接触して熱固定が行われることから、金型キ
ャビティの表面温度を言う。The heat fixing temperature must be 135°C or higher, and 1
Temperatures of 40 to 230°C are preferred. In this specification, the heat setting temperature refers to the surface temperature of the mold cavity since the biaxially stretched blow-molded article is heat set in contact with the surface of the mold cavity.
熱固定によりもたらされる延伸成形容器壁（胴部の結晶
化度は、温度と時間の関数であり、高温では短時間の内
にポリエステルの結晶化度が向上し、比較的短時間の内
に熱固定の効果が発現される。本発明の容器の製造では
、１３５℃以上という高温で熱固定操作を行うことによ
り、二軸延伸ブローにより最も高度に二軸分子配向され
た胴部壁の結晶化度を３４％以上に高めることができる
。熱固定の時間は、温度によっても相違するが、一般に
２秒以上、特に３乃至１０秒の範囲である。熱固定操作
時には、熱効率の点で、ブロー成形に用いた加圧流体を
成形体内部に閉じ込めておくのがよい。The crystallinity of the stretch-formed container wall (body) produced by heat setting is a function of temperature and time; at high temperatures the crystallinity of polyester increases within a short time; In the production of the container of the present invention, the heat setting operation is carried out at a high temperature of 135°C or higher to achieve crystallization of the body wall with the most highly biaxial molecular orientation due to biaxial stretching blowing. The heat setting time varies depending on the temperature, but is generally 2 seconds or more, especially in the range of 3 to 10 seconds. It is preferable to confine the pressurized fluid used for molding inside the molded body.
次いで熱固定された成形体を、その表面温度（外表面温
度）がポリエチレンテレフタレート（ＰＥＴ）のガラス
転移点（Ｔｇ＝６９℃）よりも高温でしかも実質上保形
可能な温度、好適には７５乃至１２０℃の温度、最も好
適には８０乃至１１５℃の温度で金型より取出す、延伸
成形され且つ熱固定された成形体器壁には、内部歪が残
留しているが、熱固定後の成形体を、ＰＥＴのガラス転
移点（Ｔｇ）よりも高い温度で取出すことにより、器壁
中の（ＰＥＴ）分子鎖の運動が可能となることから、後
述するアニーリング処理により、内部残留歪みの除去乃
至は低減化が可能となる。Next, the heat-set molded body is heated to a temperature at which its surface temperature (outer surface temperature) is higher than the glass transition point (Tg = 69°C) of polyethylene terephthalate (PET) and at which it can substantially retain its shape, preferably 75°C. The wall of the stretch-formed and heat-set molded body removed from the mold at a temperature between 120°C and 120°C, most preferably between 80°C and 115°C, retains some internal strain; By taking out the molded body at a temperature higher than the glass transition point (Tg) of PET, the (PET) molecular chains in the container wall can move, so the internal residual strain can be removed by the annealing treatment described below. Or it can be reduced.
熱固定された成形体を取出す時の温度は、成形体の自由
収縮は生ずるが成形体の外形が実質上保存されるような
温度であることから、本発明の容器における保形可能温
度は、取出し時の温度とほぼ対応する。この取出し時の
温度は、未熱固定の成形体では低く、熱固定の程度が大
きくなれば高くなる。上記の製法では、二輪延伸成形体
を１３５℃以上という高温で熱固定するため、取出し温
度の上限値を１２０℃と高くすることが可能となり、こ
れに伴って保形可能温度も高くなる。The temperature at which the heat-set molded product is taken out is such that free shrinkage of the molded product occurs but the external shape of the molded product is substantially preserved, so the temperature at which the container of the present invention can retain its shape is: It roughly corresponds to the temperature at the time of removal. The temperature at the time of taking out is low for unheated compacts, and increases as the degree of heat setting increases. In the above manufacturing method, the two-wheel stretched molded body is heat-set at a high temperature of 135° C. or higher, so the upper limit of the take-out temperature can be increased to 120° C., and the shape-retainable temperature also increases accordingly.
熱固定後の成形体を金型内から取出すための冷却は、高
温の金型キャビティ表面温度をあまり冷却しないように
、成形体内部に室温の流体或いは冷却された流体を循環
させることにより有利に行われる。一般に、この取出し
のための冷却は３乃至２０秒程度の時間で行うことが望
ましい。Cooling for taking out the molded product from the mold after heat-setting is advantageous by circulating room temperature fluid or cooled fluid inside the molded product so as not to cool down the high-temperature mold cavity surface temperature too much. It will be done. Generally, it is desirable that this cooling for removal be carried out for about 3 to 20 seconds.
最後に、取出した成形体を室温雰囲気中でアニーリング
して成形体を自由収縮させる。このアニーリングによる
成形体の自由収縮により、成形体器壁中の残留歪が緩和
され、容器の保形可能温度を取出し時の温度とほぼ対応
させることが可能となる。Finally, the molded body taken out is annealed in an atmosphere at room temperature to allow the molded body to freely shrink. Due to the free shrinkage of the molded product due to this annealing, the residual strain in the wall of the molded product container is alleviated, and it becomes possible to make the temperature at which the container can retain its shape approximately correspond to the temperature at the time of removal.
成形体の自由収縮は、金型内容積（Ｖ 、 ）に対する
容器外形体積（Ｖ２）の減少率（α）、即ち、
が、０．３乃至３．０％の範囲となるように行えば、残
留率はほぼ緩和されているということができる。容器外
形体積（Ｖ２）は、容器内容積をｖｌ、容器目付量をＷ
、容器壁密度なρとすると、式
％式％
本発明の容器においては、内容物の熱間充填や内容物充
填容器の加熱殺菌に際して、器壁の不斉変形（部分的な
変形）や全体的な収縮が防止され、熱固定ポリエステル
延伸成形容器のこの用途への応用が可能となる。If the free shrinkage of the molded body is performed such that the reduction rate (α) of the container external volume (V2) with respect to the mold internal volume (V, ), that is, is in the range of 0.3 to 3.0%, It can be said that the residual rate is almost relaxed. The external volume of the container (V2) is defined by the internal volume of the container as vl and the basis weight of the container as W.
, the container wall density is ρ, the formula % formula % In the container of the present invention, when hot filling the contents or heat sterilizing the filled container, the container wall may be asymmetrically deformed (partially deformed) or the entire container may be deformed. This prevents physical shrinkage and allows the use of heat-set polyester stretch-molded containers for this purpose.
本発明に右いて、熱可塑性ポリエステルとしては、エチ
レンテレフタレート単位を主体とする熱可塑性ポリエス
テル、例えばＰＥＴやグリコール成分としてヘキサヒド
ロキシリレングリコール等の他のグリコール類の少量を
含有せしめ或いは二塩基酸成分としてイソフタル酸やヘ
キサヒドロテレフタル酸等の他の二塩基酸成分の少量を
含有せしめた所謂改質ＰＥＴ等が使用される。これらの
ポリエステルは、単独でも或いはナイロン類、ポリカー
ボネート或いはボリアリレート等の他の樹脂とのブレン
ド物の形でも使用し得る。用いるポリエステルは、当然
のことながら、フィルムを形成するに足る分子量を有す
るべきである。ポリエステルの固有粘度は０．７０乃至
１．２０ｄｌ／ｇの範囲内にあるがよい。In the present invention, thermoplastic polyesters include thermoplastic polyesters mainly containing ethylene terephthalate units, such as PET, containing small amounts of other glycols such as hexahydroxylylene glycol as a glycol component, or as a dibasic acid component. So-called modified PET containing a small amount of other dibasic acid components such as isophthalic acid and hexahydroterephthalic acid is used. These polyesters can be used alone or in the form of blends with other resins such as nylons, polycarbonates or polyarylates. The polyester used should, of course, have a sufficient molecular weight to form a film. The intrinsic viscosity of the polyester may be in the range of 0.70 to 1.20 dl/g.
延伸ブロー成形に使用する有底プリフォームは、それ自
体公知の任意の手法、例えば射出成形法、バイブ押出成
形法等の製造される。前者の方法では、溶融ポリエステ
ルを射出し、最終容器に対応する口頚部を備えた有底プ
リフォームを非晶質の状態で製造する。後者の方法はエ
チレン−ビニルアルコール共重合体等のガスバリヤ−性
中間樹脂層を備えた有底プリフォームの製造に有利な方
法であり、押出された非晶質パイプを切断し、一端部に
圧縮成形で口頚部を形成されると共に。The bottomed preform used in stretch blow molding is manufactured by any method known per se, for example, injection molding, vibrator extrusion, and the like. In the former method, molten polyester is injected to produce a bottomed preform in an amorphous state with a mouth and neck corresponding to the final container. The latter method is advantageous for manufacturing bottomed preforms with a gas barrier intermediate resin layer such as ethylene-vinyl alcohol copolymer, and involves cutting the extruded amorphous pipe and compressing it at one end. Along with the mouth and neck being formed by molding.
他端部を閉じて有底プリフォームとする。高温下での蓋
との係合、密封状態を良好に維持するために、容器口頚
部となる部分のみを予め熱結晶化させておくことができ
る。勿論、この熱結晶化は以後の任意の段階で行うこと
もできる。The other end is closed to form a bottomed preform. In order to maintain good engagement with the lid and sealing under high temperatures, only the portion that will become the neck of the container can be thermally crystallized in advance. Of course, this thermal crystallization can also be performed at any subsequent step.
このプリフォームの二軸延伸ブロー成形は、割金型（キ
ャビティ型）及びコア金型を使用して、それ自体公知の
条件で行われ、例えば延伸温度、一般に９０乃至１３０
℃、特に１００乃至１２０℃の温度に予備加熱されたプ
リフォームに対して、延伸棒によりプリフォームを軸方
向に引張延伸すると共に、流体吹込みにより周方向に膨
張延伸される。軸方向の延伸倍率は、１．５乃至３．５
倍、特に２乃至３倍とし、周方向の延伸倍率は胴部で２
乃至５倍、特に３乃至４．５倍とするのがよい。Biaxial stretch blow molding of this preform is performed using a split mold (cavity mold) and a core mold under conditions known per se, for example, the stretching temperature is generally 90 to 130
C., particularly at a temperature of 100 to 120.degree. C., the preform is stretched in the axial direction by a stretching rod, and expanded and stretched in the circumferential direction by blowing fluid. The stretching ratio in the axial direction is 1.5 to 3.5.
The stretching ratio in the circumferential direction is 2 times, especially 2 to 3 times, in the body.
It is preferably 5 to 5 times, particularly 3 to 4.5 times.
本発明による優れた効果を次の例で説明する。The excellent effects of the present invention will be explained in the following example.
（実施例）
実施例１
固有粘度ＩＶが０．７８ｄｌ／ｇ、ガラス転移温度Ｔｇ
６９℃（密度ｄ １．３３５ｇ／ｃｍ３）のポリエチレ
ンテレフタレートを射出成形し、高さ１６２ｍｍ、胴部
径３０ｍｍ、胴部平均肉厚４ｍｍ、そして首部肉厚１．
５ｍｍの有底パリソン（プリフォーム）を成形し、口部
のみ熱風（２４０℃）により熱処理を行い結晶化させた
。(Example) Example 1 Intrinsic viscosity IV is 0.78 dl/g, glass transition temperature Tg
Injection molded polyethylene terephthalate at 69°C (density d 1.335 g/cm3), height 162 mm, body diameter 30 mm, body average wall thickness 4 mm, and neck wall thickness 1.
A 5 mm bottomed parison (preform) was molded, and only the mouth part was heat-treated with hot air (240°C) to crystallize it.
このプリフォームを延伸温度９７℃〜９８°Ｃに加熱し
、このプリフォームをキャビティ表面温度が１２５℃、
１４０℃及び１６０℃に加熱された内容積１５５０ｍｌ
のキャビティを有するブロー金型内で二軸延伸ブローし
てボトルを成形すると共に、該ブロー金型内に４秒間保
持して熱固定を行った後、ボトル表面温度が６５℃、７
５℃、９５℃、１１０℃及び１３０℃になった時点で金
型よりボトルを取出し、このボトルを室温雰囲気（約２
０℃）中でアニーリングして収縮させた。This preform is heated to a stretching temperature of 97°C to 98°C, and the preform is heated to a cavity surface temperature of 125°C.
Internal volume 1550ml heated to 140℃ and 160℃
The bottle was molded by biaxial stretching blowing in a blow mold with a cavity of
When the temperature reaches 5℃, 95℃, 110℃ and 130℃, remove the bottle from the mold and place the bottle in a room temperature atmosphere (approx.
0° C.) for shrinkage.
ブロー金型のキャビティ表面温度とブロー金型内容積に
対するボトル外形体積の減少率及びボトル胴部の結晶化
度との関係を表１に示す。Table 1 shows the relationship between the cavity surface temperature of the blow mold, the reduction rate of the bottle external volume with respect to the blow mold internal volume, and the crystallinity of the bottle body.
表 １
結晶化度Ｘ（％）は得られたボトルの胴部の密度を測定
し次式によって求めた。Table 1 Crystallinity X (%) was determined by measuring the density of the body of the obtained bottle and using the following formula.
ただし、ｄは２５℃における密度、ｄ。However, d is the density at 25°C.
＝１．３３５ ｇ／ｃｍ” 、 ｄ ｃ ＝１．４５５
ｇ／ｃｍ３得られたボトルを高温での熱間充填法及び
低温（室温）充填後殺菌法にて評価し、その結果を表２
に示す。=1.335 g/cm", dc =1.455
g/cm3 The obtained bottles were evaluated by hot filling method at high temperature and sterilization method after filling at low temperature (room temperature), and the results are shown in Table 2.
Shown below.
表２の結果から、本発明によって成形されたボトル、即
ちＮｏ、４．５．６及び９のボトルは、金型からの取出
し時の変形も少なく、且つ高温熱間充填法及び低温充填
後殺菌法により殺菌を施しても変形が少なく、良好な外
観を示したが、本発明の範囲外のものは変形を生じ良好
な外観を示さなかった。From the results in Table 2, the bottles molded according to the present invention, that is, bottles No. 4, 5, 6, and 9, have little deformation when taken out from the mold, and can be sterilized using the high-temperature hot filling method and the low-temperature post-filling method. Even when sterilized by the method, there was little deformation and a good appearance was exhibited, but those outside the scope of the present invention were deformed and did not have a good appearance.
（発明の効果）
本発明によれば、熱固定ポリエステル延伸固定容器の胴
部の結晶化度を３４％以上、容器の保形可能温度を７５
乃至１２０℃としたことにより、内容物の高温熱間充填
または低温充填後加熱殺菌が器壁の不斉変形や熱収縮を
生じることなしに可能になった。(Effects of the Invention) According to the present invention, the crystallinity of the body of the heat-set polyester stretch-fixed container can be increased to 34% or more, and the shape-retainable temperature of the container can be increased to 75%.
By setting the temperature to 120°C, it became possible to heat sterilize the contents after high-temperature hot filling or low-temperature filling without causing asymmetric deformation or thermal contraction of the container wall.
Claims (1)
形及び熱固定で形成された容器において、該容器の胴部
が３４％以上の結晶化度を有するように熱固定され、該
容器は７５乃至１２０℃の保形可能温度を有することを
特徴とする高温熱間充填または低温充填後加熱殺菌が可
能な熱固定ポリエステル延伸成形容器。(1) In a container formed by biaxial stretch blow molding and heat setting of polyethylene terephthalate, the body of the container is heat set to have a crystallinity of 34% or more, and the container is heated at 75 to 120°C. A heat-set polyester stretch-molded container that can be heat-sterilized after high-temperature hot filling or low-temperature filling, which is characterized by having a temperature that allows shape retention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63267173A JPH01157828A (en) | 1988-10-25 | 1988-10-25 | Heat-setting polyester orientation molding container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63267173A JPH01157828A (en) | 1988-10-25 | 1988-10-25 | Heat-setting polyester orientation molding container |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62016273A Division JPS63185620A (en) | 1987-01-28 | 1987-01-28 | Production of thermally set polyester stretched molded container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01157828A true JPH01157828A (en) | 1989-06-21 |
Family
ID=17441118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63267173A Pending JPH01157828A (en) | 1988-10-25 | 1988-10-25 | Heat-setting polyester orientation molding container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01157828A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122327A (en) * | 1991-04-18 | 1992-06-16 | Hoover Universal, Inc. | Blow molding method for making a reversely oriented hot fill container |
| US5281387A (en) * | 1992-07-07 | 1994-01-25 | Continental Pet Technologies, Inc. | Method of forming a container having a low crystallinity |
| US5474735A (en) * | 1993-09-24 | 1995-12-12 | Continental Pet Technologies, Inc. | Pulse blow method for forming container with enhanced thermal stability |
| US5829614A (en) * | 1992-07-07 | 1998-11-03 | Continental Pet Technologies, Inc. | Method of forming container with high-crystallinity sidewall and low-crystallinity base |
| JP2003095273A (en) * | 2001-09-18 | 2003-04-03 | Dainippon Printing Co Ltd | Plastic container |
| JP2011501705A (en) * | 2007-10-10 | 2011-01-13 | テクソー エイチアール エスエイエス | Thin wall container manufacturing method, pressure reinforcement method for the same container |
| JP2021530374A (en) * | 2018-07-12 | 2021-11-11 | フラニックス・テクノロジーズ・ベーフェー | Manufacturing method of container and its container |
-
1988
- 1988-10-25 JP JP63267173A patent/JPH01157828A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122327A (en) * | 1991-04-18 | 1992-06-16 | Hoover Universal, Inc. | Blow molding method for making a reversely oriented hot fill container |
| US5281387A (en) * | 1992-07-07 | 1994-01-25 | Continental Pet Technologies, Inc. | Method of forming a container having a low crystallinity |
| US5520877A (en) * | 1992-07-07 | 1996-05-28 | Continental Pet Technologies, Inc. | Method of forming container with high-crystallinity sidewall and low-crystallinity base |
| US5829614A (en) * | 1992-07-07 | 1998-11-03 | Continental Pet Technologies, Inc. | Method of forming container with high-crystallinity sidewall and low-crystallinity base |
| US6372318B1 (en) | 1992-07-07 | 2002-04-16 | Continental Pet Technologies, Inc. | Method of forming container with high-crystallinity sidewall and low-crystallinity base |
| US6926859B2 (en) | 1992-07-07 | 2005-08-09 | Graham Packaging Pet Technologies Inc. | Method of forming container with high-crystallinity sidewall and low-crystallinity base |
| US7445826B2 (en) | 1992-07-07 | 2008-11-04 | Graham Packaging Pet Technologies Inc. | Container with high-crystallinity sidewall and low-crystallinity base |
| US5474735A (en) * | 1993-09-24 | 1995-12-12 | Continental Pet Technologies, Inc. | Pulse blow method for forming container with enhanced thermal stability |
| JP2003095273A (en) * | 2001-09-18 | 2003-04-03 | Dainippon Printing Co Ltd | Plastic container |
| JP2011501705A (en) * | 2007-10-10 | 2011-01-13 | テクソー エイチアール エスエイエス | Thin wall container manufacturing method, pressure reinforcement method for the same container |
| US9011756B2 (en) | 2007-10-10 | 2015-04-21 | Plastipak Packaging, Inc. | Thin-walled plastic container for pressurization |
| JP2021530374A (en) * | 2018-07-12 | 2021-11-11 | フラニックス・テクノロジーズ・ベーフェー | Manufacturing method of container and its container |
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