JPH02274523A - Multilayer Stretched Blown Polyester Container - Google Patents
Multilayer Stretched Blown Polyester ContainerInfo
- Publication number
- JPH02274523A JPH02274523A JP1096672A JP9667289A JPH02274523A JP H02274523 A JPH02274523 A JP H02274523A JP 1096672 A JP1096672 A JP 1096672A JP 9667289 A JP9667289 A JP 9667289A JP H02274523 A JPH02274523 A JP H02274523A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- gas barrier
- injection
- container
- polyester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
- B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、多層構造を有するポリエステル容器に関する
もので、より詳細には、優れたガスバリアー性と共に口
頚部熱安定性を有する耐熱性を有する多層延伸ブローポ
リエステル容器に関する。Detailed Description of the Invention <Industrial Application Field> The present invention relates to a polyester container having a multilayer structure, and more specifically, a polyester container having excellent gas barrier properties and heat resistance with mouth and neck thermal stability. The present invention relates to a multilayer stretch-blown polyester container.
〈従来の技術〉
従来より延伸ブロー成形法によるポリエステル製容器、
特にポリエチレンテレフタレート製容器は、その優れた
諸物性（軽量性、透明性、適度な剛性等）から炭酸飲料
をはじめとする飲料、調味料、化粧品、液体洗剤、等の
容器として広く用いられている。しかし延伸ポリエステ
ル容器は無視できない程度のガス透過性を有するため、
酸素により劣化しやすい内容物、炭酸飲料などの容器と
してはガスバリアー性が不十分である。ガスバリアー性
を向上させるための手段として、他のガスバリアー性に
優れる樹脂、例えばエチレン−酢酸ビニル共重合体ケン
化物、芳香族ポリアミド樹脂などを、少な（とも−層設
けた積層構造としたり、ポリエステルと前記ガスバリア
ー性の優れる樹脂をブレンドするなどの複合容器とする
ことにより解決できることが知られている。また、延伸
ポリエステル容器は内容物を加熱充填すると、容器の変
形や収縮を引き起こすことがある。特に容器口頚部にお
ける熱変形は、液漏れの原因となるため好ましくない。<Conventional technology> Conventionally, polyester containers have been made by stretch blow molding,
In particular, polyethylene terephthalate containers are widely used as containers for carbonated drinks and other beverages, seasonings, cosmetics, liquid detergents, etc. due to their excellent physical properties (lightness, transparency, appropriate rigidity, etc.) . However, since stretched polyester containers have a non-negligible level of gas permeability,
Gas barrier properties are insufficient for containers for contents that are easily degraded by oxygen, such as carbonated drinks. As a means to improve gas barrier properties, other resins with excellent gas barrier properties, such as saponified ethylene-vinyl acetate copolymer, aromatic polyamide resin, etc., can be used in a laminated structure with a small number of layers. It is known that this problem can be solved by creating a composite container, such as by blending polyester with the resin with excellent gas barrier properties.Also, when heated and filled with stretched polyester containers, the problem may cause deformation or shrinkage of the container. In particular, thermal deformation at the mouth and neck of the container is undesirable because it causes liquid leakage.
容器の口頚部に耐熱性を付与する方法として口頚部を加
熱して結晶化したり、他の耐熱性樹脂、例えばボリアリ
レート樹脂との積層構造とする方法が知られている。Known methods for imparting heat resistance to the neck and neck of a container include heating the neck and crystallizing the mouth and creating a laminated structure with other heat-resistant resins, such as polyarylate resins.
〈発明が解決しようとする課題〉
上記のごと（延伸ポリエステル容器はガスバリアー性と
耐熱性が不十分であり各々を改良する手段は知られてい
るが、両者を満足する容器は得られていない。<Problems to be solved by the invention> As mentioned above (stretched polyester containers have insufficient gas barrier properties and heat resistance, and although means to improve each are known, a container that satisfies both has not been obtained) .
本発明は、延伸ポリエステル容器のガスバリアー性及び
耐熱性を向上する目的でなされたものである。The present invention was made for the purpose of improving the gas barrier properties and heat resistance of stretched polyester containers.
〈課題を解決するための手段〉
本発明では延伸ポリエステル容器の主に胴部にガスバリ
アー性に優れる樹脂層を少な（とも−層設け、且つ口頚
部に耐熱性に優れる樹脂層を少なくとも一層以上積層さ
せた構造とすることにより解決した。<Means for Solving the Problems> In the present invention, a stretched polyester container is provided with a small number of resin layers with excellent gas barrier properties mainly in the body, and at least one resin layer with excellent heat resistance is provided in the mouth and neck. The problem was solved by creating a laminated structure.
上記のごとき構成の延伸ポリエステル容器を得るには、
予め胴部にガスバリアー性に優れる樹脂層が少なくとも
１層介在し、且つ口頚部に耐熱性に優れる樹脂層を少な
くとも一層以上積層させた構造の多層構造を有するプリ
フォームを成形する必要がある。多層プリフォームを製
造する手段としては共射出成形法、多段射出成形法、共
押出成形法等による方法が知られている。To obtain a stretched polyester container with the above configuration,
It is necessary to mold in advance a preform having a multilayer structure in which at least one resin layer with excellent gas barrier properties is interposed in the body part, and at least one resin layer with excellent heat resistance is laminated in the mouth and neck part. Co-injection molding, multi-stage injection molding, co-extrusion, and other methods are known as methods for manufacturing multilayer preforms.
本発明においてはポリエステル樹脂、ガスバリアー性樹
脂、耐熱性樹脂の３種の樹脂を所望のプリフォームを得
るのに最適なタイミングにより共射出することによって
多層プリフォームを製造した。In the present invention, a multilayer preform was manufactured by co-injecting three types of resin, a polyester resin, a gas barrier resin, and a heat-resistant resin, at the optimal timing to obtain a desired preform.
３種の樹脂を共射出するための装置としては、独立して
射出速度、射出圧力、射出タイミングを制御できる３本
の射出シリンダーを備えそのおのおのより射出された樹
脂がプリフォーム型のゲート下部に位置するホットラン
ナ−ノズル部分において合流する構造とした。The device for co-injecting three types of resin has three injection cylinders that can independently control injection speed, injection pressure, and injection timing, and the resin injected from each cylinder is placed at the bottom of the gate of the preform mold. The structure is such that they merge at the hot runner nozzle section.
以下、図面に基づいて本発明の容器の製造方法について
説明する。Hereinafter, the method for manufacturing a container of the present invention will be explained based on the drawings.
第１図に示すごとく、成形機にはポリエステル樹脂、ガ
スバリアー性樹脂、耐熱性樹脂に相当する３本の射出シ
リンダー７．８．９が備えられ、プリフォーム型１のゲ
ート部分４に連なるホットランナ−ノズル部分５におい
て各樹脂が同心円上の流路を通過しノズル先端部分６に
おいて合流する構造となっている。各樹脂の充填条件は
、まずベースレジンであるポリエステル樹脂が適当量射
出充填された時点で、ガスバリアー性樹脂の射出を開始
する。As shown in FIG. 1, the molding machine is equipped with three injection cylinders 7, 8, 9 corresponding to polyester resin, gas barrier resin, and heat-resistant resin, and the injection cylinders 7, 8, 9 are connected to the gate part 4 of the preform mold 1. Each resin passes through concentric channels in the runner-nozzle portion 5 and merges at the nozzle tip portion 6. The filling conditions for each resin are as follows: First, when an appropriate amount of polyester resin as a base resin is injected and filled, injection of gas barrier resin is started.
その後のポリエステル樹脂とガスバリアー性樹脂との共
射出過程において、ガスバリアー性樹脂は金型表面近傍
に形成される冷却固化したポリエステル樹脂スキン層の
間の溶融部分を流動しプリフォーム胴部に−様な層を形
成する。In the subsequent co-injection process of the polyester resin and the gas barrier resin, the gas barrier resin flows through the molten portion between the cooled and solidified polyester resin skin layer formed near the mold surface, and flows into the body of the preform. Forms various layers.
この際ガスバリアー性樹脂の射出速度はポリエステル樹
脂のプリフォーム型への充填が終了するのとほぼ同時に
ガスバリアー性樹脂の射出充填が完了するような一定の
速度にすることが望ましい。At this time, it is desirable that the injection speed of the gas barrier resin be set at a constant speed so that the injection and filling of the gas barrier resin is completed almost at the same time as the filling of the polyester resin into the preform mold is completed.
耐熱性樹脂の射出充填はプリフォーム型内へおよそ６０
〜８０％樹脂が充填された時点に射出を開始する。射出
速度は大で、射出圧力も高くしスポット的に射出充填す
る。Injection filling of heat-resistant resin into the preform mold takes approximately 60 minutes.
Injection begins when ~80% resin is filled. The injection speed is high and the injection pressure is high to perform spot injection filling.
上記のごとく３種の樹脂を共射出することにより胴部に
−様なガスバリアー性樹脂層が介在し、口頚部に耐熱性
樹脂が積層した構造の目的とするプリフォームが成形さ
れる。ついでこれを適切な温度にＭｉｌｌし、通常の方
法で延伸ブローすることにより第２図のごとき本発明の
容器が得られる。By co-injecting the three types of resins as described above, a desired preform having a structure in which a gas barrier resin layer like this is interposed in the body part and a heat-resistant resin layered in the mouth and neck part is molded. The container of the present invention as shown in FIG. 2 is then obtained by milling this to an appropriate temperature and stretch-blowing in a conventional manner.
〈実施例〉
第１図においてポリエステル樹脂用射出シリンダー径が
３５ｍｍ、ガスバリアー性樹脂及び耐熱性樹脂用射出シ
リンダー径が１９ｍｍのものを使用した。<Example> In FIG. 1, the diameter of the injection cylinder for polyester resin was 35 mm, and the diameter of the injection cylinder for gas barrier resin and heat-resistant resin was 19 mm.
ホットランナ−ノズル５は、各樹脂が同心円上の流路を
通過しノズル先端部分６において合流する構造のものを
用い、波路外側からポリエステル樹脂、バリアー性樹脂
、耐熱性樹脂が通過するようにした。The hot runner nozzle 5 has a structure in which each resin passes through concentric channels and merges at the nozzle tip 6, so that the polyester resin, barrier resin, and heat-resistant resin pass from the outside of the wave channel. .
プリフォームは全長１４５ｍｍ、胴部外径２８ｍｍ、胴
部肉厚４．５ｍｍのものを使用し、これを容Ｉｔ １５
０ Ｏｍ ｌの容器１０に２軸延伸成形した。尚、樅延
伸倍率は２．０倍、面積倍率は７゜２倍である。使用し
た各樹脂は次の通りである９ポリエステル樹脂：ポリエ
チレンテレフタレー） （ＰＥＴ、 ＩＶ＝０
． ７５）ガスバリアー性梼脂（１）：メタキシリレ
ン基含有ポリアミド（ＭＸＮｙ）
ガスバリアー性梼脂（２）：エチレンービニルアルコー
ル共重合体（ＥＶＯＨ、エチレン部分４４％）
耐熱性樹脂：ボリアリレート樹脂
多層プリフォームの成形はまずポリエステル樹脂を１〜
２秒間射出充填した時点でガスバリアー性樹脂の射出を
開始し２種の樹脂を共射出させる。The preform used had a total length of 145 mm, a body outer diameter of 28 mm, and a body wall thickness of 4.5 mm.
A container 10 of 0 Oml was formed by biaxial stretching. Incidentally, the fir stretching magnification is 2.0 times, and the area magnification is 7°2 times. The resins used are as follows.9 Polyester resin: polyethylene terephthalate (PET, IV=0
．． 75) Gas barrier resin (1): Meta-xylylene group-containing polyamide (MXNy) Gas barrier resin (2): Ethylene-vinyl alcohol copolymer (EVOH, 44% ethylene portion) Heat-resistant resin: polyarylate resin multilayer To mold the preform, first of all, polyester resin is
After injection and filling for 2 seconds, injection of the gas barrier resin is started and the two resins are co-injected.
ついでポリエステル樹脂の射出開始から２．５〜３秒後
に耐熱性樹脂の射出を開始し、大きな射出速度と高い射
出圧力をもってスポット的に射出充填を完了させる。Then, 2.5 to 3 seconds after the start of injection of the polyester resin, injection of the heat-resistant resin is started, and injection filling is completed in a spot manner at a high injection speed and high injection pressure.
その後ポリエステル樹脂とガスバリアー性樹脂の共射出
を継続し、ポリエステル樹脂の射出開始から６〜８秒後
に樹脂の充填を完了させ、８〜ｌＯ秒間の保圧時間査と
る。Thereafter, the co-injection of the polyester resin and the gas barrier resin is continued, and filling of the resin is completed 6 to 8 seconds after the start of injection of the polyester resin, and a pressure holding time of 8 to 10 seconds is taken.
つぎにプリフォームを９０〜１００°Ｃに温調し、これ
を容器形状のブロー型内において延伸ロンドにより縦方
向に延伸し、次いで２０ｋｇ／ｃｍ２の圧縮空気を吹き
込んで容器１０を得た。得られた容器のガスバリアー性
及び耐熱性の評価結果は次のようである。Next, the temperature of the preform was adjusted to 90 to 100°C, and it was stretched in the longitudinal direction by a stretching iron in a container-shaped blow mold, and then compressed air of 20 kg/cm 2 was blown into the preform to obtain a container 10. The evaluation results of the gas barrier properties and heat resistance of the obtained container are as follows.
（以下余白）
表
〈発明の効果〉
本発明の如くポリエステル容器の胴部にガスバリアー性
樹脂、口頚部に耐熱性樹脂を介在させることにより、容
器にガスバリアー性と耐熱性を同時に付与できるので応
用できる内容物の種類も増しその実用性は高い。また共
射出法により多層プリフォームを１工程で成形するので
他に余分な工程が不用となり生産コストも向上する。(The following is a blank space) Table <Effects of the Invention> By interposing a gas barrier resin in the body of a polyester container and a heat resistant resin in the mouth and neck as in the present invention, gas barrier properties and heat resistance can be imparted to the container at the same time. The variety of contents to which it can be applied is increasing, and its practicality is high. Furthermore, since the multilayer preform is molded in one step using the co-injection method, no additional steps are required, which improves production costs.
第１図は、本発明の容器の製造に用いる多層プリフォー
ムを成形する装置の概略図、第２図は本発明の多層容器
の１例の断面図である。
１・・・ プリフォーム型
２・・・ キャビティ型
３・・・ コア型
４・・・ ゲート部分
５・・・ ホイノトラン六−ノズル
６・・・ ノズル先端
７・・・ ポリエステル射出シリンダー８・・・ ガス
バリアー性樹脂射出シリンダー９・・・ 耐熱性樹脂射
出シリンダー
１０・・・ 多層容器本体
１１・・・ ポリエステエル樹脂層
１２・・・ ガスバリアー性樹脂層
耐熱性樹脂層
特
許
出
願
人
凸
版
印
刷
株
式FIG. 1 is a schematic diagram of an apparatus for molding a multilayer preform used for manufacturing the container of the present invention, and FIG. 2 is a sectional view of an example of the multilayer container of the present invention. 1... Preform mold 2... Cavity mold 3... Core mold 4... Gate part 5... Hoinotran 6-nozzle 6... Nozzle tip 7... Polyester injection cylinder 8... Gas barrier resin injection cylinder 9 Heat resistant resin injection cylinder 10 Multilayer container body 11 Polyester resin layer 12 Gas barrier resin layer Heat resistant resin layer Patent applicant Toppan Printing Co., Ltd.
Claims (1)
成形してなる口頚部、肩部、胴部、底部を有する多層プ
ラスチック容器において、ポリエチレンテレフタレート
樹脂を主体とする熱可塑性ポリエステルを内外層とし、
胴部にガスバリアー性に優れる樹脂層が少なくとも１層
介在し、口頚部に耐熱性に優れる樹脂が少なくとも１層
以上積層した構造であることを特徴とする多層延伸ブロ
ー容器(1) In a multilayer plastic container having a neck and neck, shoulders, body, and bottom formed by biaxial stretch blow molding of a preform having a multilayer structure, the inner and outer layers are made of thermoplastic polyester mainly composed of polyethylene terephthalate resin,
A multilayer stretch blow container characterized by having a structure in which at least one resin layer with excellent gas barrier properties is interposed in the body, and at least one layer of resin with excellent heat resistance is laminated in the mouth and neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1096672A JPH02274523A (en) | 1989-04-17 | 1989-04-17 | Multilayer Stretched Blown Polyester Container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1096672A JPH02274523A (en) | 1989-04-17 | 1989-04-17 | Multilayer Stretched Blown Polyester Container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02274523A true JPH02274523A (en) | 1990-11-08 |
Family
ID=14171295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1096672A Pending JPH02274523A (en) | 1989-04-17 | 1989-04-17 | Multilayer Stretched Blown Polyester Container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02274523A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03136813A (en) * | 1989-10-23 | 1991-06-11 | Nissei Ee S B Kikai Kk | Preform of heat resistant synthetic resin vessel and molding method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57128516A (en) * | 1981-10-23 | 1982-08-10 | Toyobo Co Ltd | Blow-molded container having multilayer construction and method for producing the same |
| JPS63124904A (en) * | 1986-11-04 | 1988-05-28 | インペリアル・ケミカル・インダストリーズ・ピーエルシー | Grain gage |
| JPS63163650A (en) * | 1986-12-26 | 1988-07-07 | Matsushita Electric Ind Co Ltd | Ic card |
-
1989
- 1989-04-17 JP JP1096672A patent/JPH02274523A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57128516A (en) * | 1981-10-23 | 1982-08-10 | Toyobo Co Ltd | Blow-molded container having multilayer construction and method for producing the same |
| JPS63124904A (en) * | 1986-11-04 | 1988-05-28 | インペリアル・ケミカル・インダストリーズ・ピーエルシー | Grain gage |
| JPS63163650A (en) * | 1986-12-26 | 1988-07-07 | Matsushita Electric Ind Co Ltd | Ic card |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03136813A (en) * | 1989-10-23 | 1991-06-11 | Nissei Ee S B Kikai Kk | Preform of heat resistant synthetic resin vessel and molding method thereof |
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