JPH0470977B2 - - Google Patents
Info
- Publication number
- JPH0470977B2 JPH0470977B2 JP60157856A JP15785685A JPH0470977B2 JP H0470977 B2 JPH0470977 B2 JP H0470977B2 JP 60157856 A JP60157856 A JP 60157856A JP 15785685 A JP15785685 A JP 15785685A JP H0470977 B2 JPH0470977 B2 JP H0470977B2
- Authority
- JP
- Japan
- Prior art keywords
- bottle
- intermediate layer
- pet
- layer
- resin
- 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.)
- Expired
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
- B29C49/78—Measuring, controlling or regulating
-
- 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
- B29C2049/787—Thickness
- B29C2049/78705—Thickness of a layer, e.g. intermediate layer
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3008—Preforms or parisons made of several components at neck portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3012—Preforms or parisons made of several components at flange portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3016—Preforms or parisons made of several components at body portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/302—Preforms or parisons made of several components at bottom portion
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
- B29C2949/3026—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
- B29C2949/3028—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components
-
- 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
- B29C2949/30—Preforms or parisons made of several components
- B29C2949/3032—Preforms or parisons made of several components having components being injected
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
技術分野
本発明は、ポリエチレンテレフタレート
（PET）ボトルの例えばガスバリヤー性または耐
熱性等の性質を改善するため積層構造となした
PETボトルの製造法に関する。[Detailed Description of the Invention] Technical Field The present invention relates to a polyethylene terephthalate (PET) bottle having a laminated structure to improve properties such as gas barrier properties or heat resistance.
Regarding the manufacturing method of PET bottles.
従来技術と問題点
PET製のプラスチツクボトルは食品や飲料等
の液体容器として広く使用されている。通常は単
層であるが、PET単層では満足し得ない性能、
例えばガスバリヤー性や耐熱性が要求される場
合、PETを両側層とし、目的に応じ例えばガス
バリヤー性または耐熱性にすぐれた熱可塑性樹脂
を中間層とした積層構造のプリフオームを成形
し、該プリフオームを延伸ブロー成形によつて積
層PETボトルを製造する方法が提案されている。
この場合中間樹脂層は求められている性能を有す
るほか、PETの透明性を阻害しないように無色
透明なものが一般に使用されている。Prior Art and Problems Plastic bottles made of PET are widely used as containers for liquids such as food and beverages. It is usually a single layer, but the performance cannot be satisfied with a single PET layer.
For example, when gas barrier properties or heat resistance are required, a preform with a laminated structure is molded, with PET layers on both sides and a thermoplastic resin with excellent gas barrier properties or heat resistance as an intermediate layer depending on the purpose. A method of manufacturing laminated PET bottles by stretch blow molding has been proposed.
In this case, the intermediate resin layer has the required performance and is generally colorless and transparent so as not to impede the transparency of PET.
このような積層構造のプリフオームの製造法
は、例えば特開昭57−128520に開示されている。
該方法は共射出成形法により、先に射出する流動
状態にあるPET樹脂中にタイミングをずらして
中間層の他の樹脂を注入することを骨子とするも
のであるが、PETおよび他の樹脂の温度、他の
樹脂をPET中に注入するタイミングおよびその
注入圧等の成形条件の微妙な変化によつて中間層
樹脂の分布状態が変動するという問題があつた。
しかしながら従来は中間層樹脂の分布状態を的確
に、かつ簡便に把握する方法が知られていなかつ
たために、中間層樹脂の分布状態に関連させてボ
トル製造条件を的確に制御することができなかつ
た。 A method for manufacturing a preform having such a laminated structure is disclosed in, for example, Japanese Patent Laid-Open No. 128520/1983.
This method is based on co-injection molding, in which other resins for the intermediate layer are injected at different timings into the fluidized PET resin that is injected first. There was a problem in that the distribution state of the intermediate layer resin fluctuated due to subtle changes in molding conditions such as temperature, the timing of injecting other resins into PET, and the injection pressure.
However, since there was no known method to accurately and easily grasp the distribution state of the intermediate layer resin, it was not possible to accurately control bottle manufacturing conditions in relation to the distribution state of the intermediate layer resin. .
本発明の構成
本発明は、両外層をポリエチレンテレフタレー
トとし、中間層を他の熱可塑性樹脂層とした三層
構造のプリフオームを成形し、次いで該プリフオ
ームを延伸ブロー成形してプラスチツクボトルを
製造する方法であつて、あらかじめ中間層を形成
する樹脂中に紫外線吸収剤を含ませておき、得ら
れたプリフオームおよび／またはボトル壁の紫外
線吸収率を測定することによつて中間層の分布状
態を把握し、それに基づいてボトルの製造条件を
適宜制御することを特徴とする積層プラスチツク
ボトルの製造法を提供する。Structure of the present invention The present invention is a method for manufacturing a plastic bottle by molding a three-layer preform in which both outer layers are made of polyethylene terephthalate and an intermediate layer is another thermoplastic resin layer, and then the preform is stretch-blow molded. The distribution state of the intermediate layer can be ascertained by impregnating a UV absorber in the resin forming the intermediate layer in advance and measuring the UV absorbance of the obtained preform and/or bottle wall. The present invention provides a method for manufacturing a laminated plastic bottle, which is characterized in that bottle manufacturing conditions are appropriately controlled based on the method.
積層構造のプリフオームの成形方法としては、
例えば前出の特開昭57−128520に開示されている
共射出成形法を使用することができるが、これに
限られない。例えば、引用公開公報の方法におい
ては、ボトルネツクの単層部分とボトル本体の積
層部分との境界の位置は、主として流動状態にあ
るPET中へ中間層樹脂を注入するタイミングに
よつて決まる。このタイミングが早いと中間層が
ボトルネツク部分にも形成され、遅ければボトル
本体に中間層を持たない部分が形成されることに
なる。そこでプリフオームまたは最終ボトルまた
はその両方の必要箇所について紫外線吸収率を測
定すれば、前記境界の位置が明確になり、それに
よつて中間層樹脂の注入を開始すべき適切なタイ
ミングを決定することができる。同様に、中間層
の厚みを紫外線吸収率に関連させて制御すること
も可能である。 The method for forming a preform with a laminated structure is as follows:
For example, the co-injection molding method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 57-128520 can be used, but is not limited thereto. For example, in the method disclosed in the cited publication, the position of the boundary between the single layer portion of the bottleneck and the laminated portion of the bottle body is determined mainly by the timing of injecting the intermediate layer resin into PET in a fluid state. If this timing is early, the intermediate layer will also be formed in the bottle neck portion, and if this timing is late, a portion without the intermediate layer will be formed in the bottle body. Therefore, by measuring the UV absorption at the required points on the preform and/or the final bottle, the location of said boundaries can be clearly determined, thereby determining the appropriate timing to start injecting the interlayer resin. . It is likewise possible to control the thickness of the intermediate layer in relation to the UV absorption.
本発明において両側の外層に使用するPET樹
脂は公知のものでよく、いわゆる第３成分を含む
ものであつてもよい。ただし外層樹脂は紫外線吸
収剤を含んではならないことは自明であろう。 In the present invention, the PET resin used for the outer layers on both sides may be of a known type, and may also contain a so-called third component. However, it is obvious that the outer layer resin must not contain an ultraviolet absorber.
中間層に用いる熱可塑性樹脂は目的に応じて選
択される。例えばガスバリヤー性の改善の目的に
はポリアミド樹脂、エチレン−ビニルアルコール
共重合体、ポリエチレンイソフタレート、ポリ塩
化ビニリデン等が使用され、耐熱性の改善の目的
には、フタル酸とビスフエノールＡよりなるポリ
エステル樹脂（ユニチカ製、Ｕポリマー8400）、
変性ポリアクリレート、アクリロニトリル−スチ
レン共重合体等が使用できる。その他目的に応じ
て種々の熱可塑性樹脂が中間層として使用可能で
ある。 The thermoplastic resin used for the intermediate layer is selected depending on the purpose. For example, for the purpose of improving gas barrier properties, polyamide resin, ethylene-vinyl alcohol copolymer, polyethylene isophthalate, polyvinylidene chloride, etc. are used, and for the purpose of improving heat resistance, phthalic acid and bisphenol A are used. Polyester resin (manufactured by Unitika, U Polymer 8400),
Modified polyacrylates, acrylonitrile-styrene copolymers, etc. can be used. Various other thermoplastic resins can be used as the intermediate layer depending on the purpose.
中間層樹脂へ添加される紫外線吸収剤として
は、ベンゾフエノン系、ベンゾトリアゾール系、
サリチル酸誘導体等の有機系のもののほか、平均
粒子径が可視光線の波長よりも小さく、紫外線を
選択的に反射、散乱により遮蔽する超微粒子酸化
チタン、酸化鉄、酸化ケイ素等の無機紫外線遮蔽
剤も使用し得る。これら超微粒子無機酸化物は、
実用的な添加量範囲内では樹脂に十分な透明性を
保持させることができる。紫外線吸収剤の添加量
は約0.01〜10％、好ましくは0.1〜１％である。
紫外線吸収率に代えて紫外線透過率を測定しても
同一目的が達成し得ることは自明であろう。 Ultraviolet absorbers added to the intermediate layer resin include benzophenone, benzotriazole,
In addition to organic products such as salicylic acid derivatives, there are also inorganic UV-screening agents such as ultrafine particle titanium oxide, iron oxide, and silicon oxide that have an average particle diameter smaller than the wavelength of visible light and selectively reflect and scatter UV rays. Can be used. These ultrafine particle inorganic oxides are
Within a practical addition amount range, the resin can maintain sufficient transparency. The amount of ultraviolet absorber added is approximately 0.01-10%, preferably 0.1-1%.
It is obvious that the same objective can be achieved by measuring ultraviolet transmittance instead of ultraviolet absorbance.
中間層に含まれる紫外線吸収剤は製品ボトル中
に残留し、ボトルを充填した後中味を紫外線によ
る変質から保護するのに役立つ。 The UV absorber contained in the intermediate layer remains in the product bottle and helps protect the contents from UV deterioration after the bottle is filled.
実施例 １
両側層を市販のPETとし、中間層をフタル酸
とビスフエノールＡよりなるポリエステルを含有
する樹脂（ユニチカ製、Ｕポリマー8400）とし、
この中間層に紫外線吸収剤〔住化カラー社製、ス
ミソーブ200、化学名２−（2′−ヒドロキシ−5′−
メチルフエニル）ベンゾトリアゾール〕を0.1％
混入し、共射出成形法によりプリフオームを成形
し、延伸ブロー成形して耐熱性ボトルを製造し
た。Example 1 Both layers were made of commercially available PET, the middle layer was made of a resin containing polyester made of phthalic acid and bisphenol A (manufactured by Unitika, U Polymer 8400),
This intermediate layer contains an ultraviolet absorber [manufactured by Sumika Color Co., Ltd., Sumisorb 200, chemical name: 2-(2'-hydroxy-5'-
Methylphenylbenzotriazole] 0.1%
A preform was formed by co-injection molding, and a heat-resistant bottle was manufactured by stretch blow molding.
PET層の全厚みは315μｍ、中間層の厚みは35μ
ｍであつた。このボトルの壁部分の紫外線吸収率
を日立製作所製、ダブルビーム分光光度計150−
20型を用い、波長340nｍにおいて吸収率を測定
した。比較のためPET単体ボトル（厚み350μｍ）
についても同様に紫外線吸収率を測定した。その
結果は以下のとおりであり、この測定が中間層形
成樹脂の分布状態を把握する手段として有効であ
ることが判明した。 ボ ト ル
UV吸収率、％
PET単層 29
PET／Ｕポリマー8400／PET 82
実施例 ２
両側層をPETとし、中間層をエチレン−ビニ
ルアルコール共重合体樹脂とし、この中間層に紫
外線吸収剤（スミソーブ200）を0.05％混入し、
共射出成形法によりプリフオームを成形し、延伸
ブロー成形してガスバリヤー性を持つボトルを製
造した。 The total thickness of the PET layer is 315μm, the thickness of the middle layer is 35μm
It was m. The ultraviolet absorption rate of the wall of this bottle was measured using a Hitachi Double Beam Spectrophotometer 150-
Absorption rate was measured at a wavelength of 340 nm using a model 20. For comparison, a single PET bottle (thickness 350μm)
The ultraviolet absorbance was also measured in the same manner. The results are as follows, and it has been found that this measurement is effective as a means of grasping the distribution state of the intermediate layer forming resin. Bottle UV absorption rate, % PET single layer 29 PET/U polymer 8400/PET 82 Example 2 Both sides are made of PET, the middle layer is made of ethylene-vinyl alcohol copolymer resin, and this middle layer has a UV absorber ( Mixed with 0.05% of Sumisorb 200),
A preform was molded by co-injection molding, and a bottle with gas barrier properties was manufactured by stretch blow molding.
PET層の全厚みは315μｍ、中間層の厚みは35μ
ｍであつた。このボトルの壁部分の紫外線吸収率
を実施例１と同様に測定した。比較のためPET
単体ボトル（厚み350μｍ）についても同様に紫
外線吸収率を測定した。その結果は以下のとおり
であり、この測定が中間層形成樹脂の分布状態を
把握する手段として有効であることが判明した。 ボ ト ル
UV吸収率、％
PET単層 29
PET／エチレン−ビニルアル
コール共重合体／PET 55
以上の説明から明らかなように、本発明は簡便
な方法で積層構造のPETボトルの中間層形成樹
脂の分布状態を把握することを可能とするもので
あり、これにより適切な中間層を有する高品質の
積層プラスチツクボトルが得られるように製造条
件を制御することを可能としたものである。 The total thickness of the PET layer is 315μm, the thickness of the middle layer is 35μm
It was m. The ultraviolet absorbance of the wall portion of this bottle was measured in the same manner as in Example 1. PET for comparison
The ultraviolet absorbance of a single bottle (thickness: 350 μm) was also measured in the same manner. The results are as follows, and it has been found that this measurement is effective as a means of grasping the distribution state of the intermediate layer forming resin. Bottle UV absorption rate, % PET single layer 29 PET/ethylene-vinyl alcohol copolymer/PET 55 As is clear from the above explanation, the present invention uses a simple method to create an intermediate layer forming resin for PET bottles with a laminated structure. This makes it possible to understand the distribution state of the plastic bottles, which makes it possible to control manufacturing conditions so as to obtain high-quality laminated plastic bottles with appropriate intermediate layers.
Claims (1)
中間層を他の熱可塑性樹脂層とした三層構造のプ
リフオームを成形し、次いで該プリフオームを延
伸ブロー成形してプラスチツクボトルを製造する
方法であつて、あらかじめ中間層を形成する樹脂
中に一定濃度で紫外線吸収剤を含ませておき、得
られたプリフオームおよび／またはボトル壁の紫
外線吸収率を測定することによつて中間層の分布
状態を把握し、それに基づいてボトルの製造条件
を適宜制御することを特徴とする積層プラスチツ
クボトルの製造法。1 Both outer layers are made of polyethylene terephthalate,
A method of manufacturing a plastic bottle by molding a three-layer preform with the intermediate layer as another thermoplastic resin layer, and then stretch-blow molding the preform, in which a certain concentration is added to the resin forming the intermediate layer in advance. By impregnating the bottle with a UV absorber and measuring the UV absorbance of the obtained preform and/or bottle wall, the distribution state of the intermediate layer can be ascertained, and the manufacturing conditions of the bottle can be appropriately controlled based on this. A method for manufacturing a laminated plastic bottle characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60157856A JPS6218238A (en) | 1985-07-16 | 1985-07-16 | Manufacture of laminated plastic bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60157856A JPS6218238A (en) | 1985-07-16 | 1985-07-16 | Manufacture of laminated plastic bottle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6218238A JPS6218238A (en) | 1987-01-27 |
| JPH0470977B2 true JPH0470977B2 (en) | 1992-11-12 |
Family
ID=15658867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60157856A Granted JPS6218238A (en) | 1985-07-16 | 1985-07-16 | Manufacture of laminated plastic bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6218238A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5013442A (en) * | 1990-02-09 | 1991-05-07 | Davis Water & Waste Industries, Inc. | Aerobic wastewater treatment with alkalinity control |
| US5094752A (en) * | 1990-02-09 | 1992-03-10 | Davis Water & Waste Industries, Inc. | Aerobic wastewater treatment with alkalinity control |
| KR20050100574A (en) * | 2005-09-27 | 2005-10-19 | 주식회사 이생 | A manufacturing method of blow mold preventing permeation and absorption of oxygen |
-
1985
- 1985-07-16 JP JP60157856A patent/JPS6218238A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6218238A (en) | 1987-01-27 |
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