JP3765183B2 - Method for producing two-layer preform - Google Patents

Method for producing two-layer preform Download PDF

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Publication number
JP3765183B2
JP3765183B2 JP14334998A JP14334998A JP3765183B2 JP 3765183 B2 JP3765183 B2 JP 3765183B2 JP 14334998 A JP14334998 A JP 14334998A JP 14334998 A JP14334998 A JP 14334998A JP 3765183 B2 JP3765183 B2 JP 3765183B2
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Japan
Prior art keywords
insert piece
mold
preform
diameter
layer
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JPH11333911A (en
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潔 和田
晃孝 岩崎
関　　武邦
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Toppan Inc
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Toppan Inc
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    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0816—Wall thickness of the flange
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/082—Diameter
    • B29C2949/0825—Diameter of the flange
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer 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
    • B29C2949/3012—Preforms or parisons made of several components at flange portion
    • B29C2949/3014—Preforms or parisons made of several components at flange portion partially
    • 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
    • B29C2949/3022—Preforms or parisons made of several components at bottom portion partially
    • 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
    • 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
    • B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected

Landscapes

  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、２軸延伸ブロー成形に使用する２層プリフォームの製造方法に関するものである。
【０００２】
【従来の技術】
従来、２軸延伸ブロー成形ボトルに用途に応じた特性を付与するために、２層プリフォームを用いることが知られているが、この２層プリフォームを製造する方法としては、プリフォーム本体（２００）の樹脂の特性と異なる特性を有する円筒スリーブ状のインサートピース（１００）を、図２（ａ）に示すように、キャビティ型（３２０）内に前もって挿着して成形するか、又は、図２（ｂ）に示すように、コア型（３１０）に挿着して成形していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、上述の従来の２層プリフォームの製造方法においては、円筒スリーブ状のインサートピースを前もって型に挿着するときに、適正な位置決めが難しかったり、フランジ部や底部などのボトル成形時に延伸されにくい部分にインサートピースがなく、ボトルへの特性付与が不十分であったり、また、プリフォームを延伸ロッドで延伸するときに、インサートピースとプリフォーム本体とにずれを生じて界面剥離を生じ易いことなどがあった。
【０００４】
本発明は、上述の従来の２層プリフォームの製造方法における問題を解決したものであり、型内の適正な位置にインサートピースを挿着し易く、２軸延伸ブロー成形したボトルの特性が良好であり、また、延伸時にインサートピースが界面剥離を発生しにくい２層プリフォームの製造方法を提供するものである。
【０００５】
【課題を解決するための手段】
すなわち、本発明は、外層用インサートピースを射出成形用金型内に前もって挿着して、２軸延伸ブロー成形用プリフォームを製造する方法において、前記射出成形用金型（３００）が、図１に示すように、コア型（３１０）とキャビティ型（３２０）とネック部割型（３３０）とからなり、前記インサートピース（１００）のフランジ部（１０１）の厚みをａとし、前記ネック部割型のフランジ部（３３１）の最低深さをＡとすると、Ａ＋０．０５ｍｍ≧ａ≧Ａ−０．３０ｍｍであり、前記インサートピースのフランジ部（１０１）の径をｂとし、前記ネック部割型のフランジ部（３３１）の径をＢとすると、Ｂ≧ｂ≧Ｂ−０．６０ｍｍであり、且つ、前記インサートピースのゲート用貫通孔（１０２）の径をｃとすると、１２．００ｍｍ≧ｃ≧３．００ｍｍであることを特徴とする２層プリフォームの製造方法である。
【０００７】
【作用】
本発明の製造方法おいては、外層用インサートピースの上端開口部にフランジ部を形成しており、このフランジ部をキャビティ型の上面に掛けて金型内に挿着するため、インサートピースの金型内への挿着が一般のインサーターを使用しても容易にでき、また、型締めしたときに、ネック部割型によりしっかりと押さえて位置決めするため、インサートピースを型内の適正な位置に挿着することができる。
【０００８】
また、本発明の製造方法においては、上端開口部にフランジ部をもち、下端にゲート用貫通孔をもつ底部を有する外層用インサートピースを用いて２層プリフォームを製造するため、この２層プリフォームを２軸延伸ブロー成形して製造されたボトルは、フランジ部や底部の延伸されにくい部分にも、特性を付与するためのインサートピースがあるので、ボトルの特性が良好である。
【０００９】
さらに、本発明の製造方法で作製された２層プリフォームは、２軸延伸ブロー成形工程で加熱され、延伸ロッドをプリフォームの底部に当てて延伸するときに、インサートされている外層インサートピースにもフランジと底部とがあるため、インサートピースがプリフォーム本体と一緒に延伸ロッドで延伸され、インサートピースがプリフォーム本体から界面剥離することがない。
【００１０】
【発明の実施の形態】
本発明の２層プリフォームの製造方法は、図１に示すように、必要な特性を付与するための外層用インサートピース（１００）を射出成形用金型（３００）内に前もって挿着し、プリフォーム本体（２００）の熱溶融する結晶性の熱可塑性樹脂、例えばポリエチレンテレフタレート、ポリエチレンイソフタレートを含むポリエチレンテレフタレート、ポリプロピレン、ポリエチレンなどを射出して、２軸延伸ブロー成形用プリフォーム（１０）を製造する方法である。この得られた２層プリフォームは、加温され、延伸ロッドで縦方向に延伸され、ブロー成形されて、本体樹脂の特性とインサートピースの特性とを兼ね備えた２層ボトルとなる。
【００１１】
次に、本発明の２層プリフォームの製造方法に用いられる一実施形態の外層用インサートピース（１００）は、例えば図１に示すように、上端開口部にフランジ部（１０１）を形成し、下端底部にプリフォーム本体の熱溶融樹脂が通るゲート用貫通孔（１０２）を有するものであり、通常、ハイバリヤ性を有するナイロン、エチレン−ビニルアルコール、ポリアクリロニトリル、ポリエチレンナフタレートなどの熱可塑性樹脂を用いて射出成形法により作製するものである。なお、本実施形態のインサートピースを金型内に挿着する方法は、インサートピースのフランジ部をキャビティ型の上面に掛けて挿着し、型締めしたときに、ネック部割型によりしっかりと押さえて所定位置に位置決めするものである。
【００１２】
そして、プリフォームを製造する射出成形用金型（３００）は、通常、図１に示すように、コア型（３１０）とキャビティ型（３２０）とネック部割型（３３０）とから構成されており、インサートピース（１００）のフランジ部（１０１）の厚みをａは、ネック部割型のフランジ部（３３１）の最低深さ（Ａ）とすると、Ａ＋0.05mm≧ａ≧Ａ−0.30mmの範囲にし、インサートピースのフランジ部（１０１）の径をｂは、ネック部割型のフランジ部（３３１）の径（Ｂ）とすると、Ｂ≧ｂ≧Ｂ−0.60mmの範囲にし、また、インサートピースのゲート用貫通孔（１０２）の径（ｃ）は、12.00mm ≧ｃ≧3.00mmの範囲にするものである。これは、ａ＞Ａ＋0.05mm及びｂ＞Ｂでは、型締め時の圧縮限界を越え、ａ＜Ａ−0.30mm及びｂ＜Ｂ−0.60mmでは、射出時にインサートピースが移動し、また、ｃは、ゲート径で決まり、3.00mm径が樹脂の流動限界であり、12.00mm 径が樹脂の充填限界である。なお、インサートピースの厚みは、通常では、0.50mm〜3.00mmの範囲で作製するものである。
【００１３】
【発明の効果】
本発明の２層プリフォームの製造方法によると、インサートピースの形状から型内の適正な位置にインサートピースを挿着し易く、一般のインサーターを用いてインサートピースの型内への挿着ができ、また、延伸時にインサートピースとプリフォーム本体との界面剥離がなく、プリフォームの製造における生産性が安定している。そして、このプリフォームを２軸延伸ブロー成形して得られたボトルは、フランジ部や底部などの延伸されにくい部分にもインサートピースがインサートされているため、ボトルの特性が良好である。
【図面の簡単な説明】
【図１】本発明の２層プリフォームの製造方法の一実施形態におけるインサートピースの形状、金型内の挿着位置、及び２層プリフォームの構成を示す説明図である。
【図２】（ａ）は、従来の一例の２層プリフォームの製造方法におけるインサートピースの形状、金型内の挿着位置、及び２層プリフォームの構成を示す説明図であり、（ｂ）は、従来の他の一例の２層プリフォームの製造方法におけるインサートピースの形状、金型内の挿着位置、及び２層プリフォームの構成を示す説明図である。
【符号の説明】
１０……プリフォーム
１００……インサートピース
１０１，２３１……フランジ部
１０２……ゲート用貫通孔
２００……プリフォーム本体
３００……射出成形用金型
３１０……コア型
３２０……キャビティ型
３３０……ネック部割型
３２１……ゲート
ａ……インサートピースのフランジ部の厚み
Ａ……ネック部割型のフランジ部の最低深さ
ｂ……インサートピースのフランジ部の径
Ｂ……ネック部割型のフランジ部の径
ｃ……インサートピースのゲート用貫通孔の径[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a two-layer preform used for biaxial stretch blow molding.
[0002]
[Prior art]
Conventionally, it has been known to use a two-layer preform in order to give a biaxial stretch blow-molded bottle a characteristic according to the application. As a method for producing this two-layer preform, a preform body ( A cylindrical sleeve-like insert piece (100) having characteristics different from those of the resin of (200) is inserted in the cavity mold (320) in advance as shown in FIG. As shown in FIG.2 (b), it inserted and shape | molded to the core type | mold (310).
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional two-layer preform manufacturing method, when a cylindrical sleeve-shaped insert piece is inserted into a mold in advance, proper positioning is difficult, or the flange portion and the bottom portion are stretched when forming a bottle. There is no insert piece in the difficult part, the property imparting to the bottle is insufficient, and when the preform is stretched with a stretching rod, the insert piece and the preform body are displaced and interface peeling is likely to occur. There was a thing.
[0004]
The present invention solves the problems in the above-mentioned conventional two-layer preform manufacturing method, and it is easy to insert the insert piece at an appropriate position in the mold, and the characteristics of the biaxial stretch blow molded bottle are good. In addition, the present invention provides a method for producing a two-layer preform in which the insert piece is less likely to cause interfacial peeling during stretching.
[0005]
[Means for Solving the Problems]
That is, the present invention relates to a method of manufacturing a biaxial stretch blow molding preform by previously inserting an insert piece for an outer layer into an injection mold, and the injection mold (300) 1 includes a core mold (310), a cavity mold (320), and a neck part split mold (330), and the thickness of the flange part (101) of the insert piece (100) is a, Assuming that the minimum depth of the split flange portion (331) is A, A + 0.05 mm ≧ a ≧ A−0.30 mm, the diameter of the flange portion (101) of the insert piece is b, and the neck portion split If the diameter of the flange portion (331) of the mold is B, B ≧ b ≧ B−0.60 mm, and if the diameter of the gate through hole (102) of the insert piece is c, 12.00 mm A method for producing a two-layer preform, which is a c ≧ 3.00 mm.
[0007]
[Action]
In the manufacturing method of the present invention, a flange portion is formed at the upper end opening of the outer layer insert piece, and the flange portion is hung on the upper surface of the cavity mold and inserted into the mold. The insert piece can be easily inserted into the mold using a general inserter, and when the mold is clamped, the insert piece is placed in an appropriate position in the mold so that it can be firmly pressed and positioned by the neck split mold. Can be inserted.
[0008]
In the manufacturing method of the present invention, a two-layer preform is manufactured by using an outer layer insert piece having a flange portion at the upper end opening and a bottom portion having a gate through hole at the lower end. A bottle manufactured by biaxially stretching blow-molding a reformer has good characteristics of the bottle because there is an insert piece for imparting characteristics to the flange portion and the bottom portion which are difficult to be stretched.
[0009]
Further, the two-layer preform produced by the production method of the present invention is heated in a biaxial stretch blow molding process, and when the stretch rod is stretched against the bottom of the preform, the outer layer insert piece is inserted. Since there is also a flange and a bottom portion, the insert piece is stretched by the stretching rod together with the preform body, and the insert piece does not peel off from the preform body.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The method for producing a two-layer preform of the present invention, as shown in FIG. 1, inserts an insert piece for outer layer (100) for imparting necessary properties in advance into an injection mold (300), A biaxially stretched blow-molded preform (10) is injected by injecting a crystalline thermoplastic resin, such as polyethylene terephthalate, polyethylene terephthalate containing polyethylene isophthalate, polypropylene, polyethylene, etc. It is a manufacturing method. The obtained two-layer preform is heated, stretched in the longitudinal direction with a stretching rod, and blow-molded to form a two-layer bottle having both the characteristics of the main body resin and the characteristics of the insert piece.
[0011]
Next, the insert piece for outer layer (100) of one embodiment used in the method for producing a two-layer preform of the present invention, for example, as shown in FIG. 1, forms a flange portion (101) in the upper end opening, It has a through hole for gate (102) through which the hot melt resin of the preform body passes at the bottom of the lower end, and usually a thermoplastic resin such as nylon, ethylene-vinyl alcohol, polyacrylonitrile, polyethylene naphthalate having high barrier properties. It is produced by an injection molding method. Note that the method of inserting the insert piece of this embodiment into the mold is to hold the insert piece firmly on the neck part mold when the flange part of the insert piece is inserted over the cavity mold and clamped. Positioning at a predetermined position.
[0012]
The injection mold (300) for producing the preform is usually composed of a core mold (310), a cavity mold (320), and a neck split mold (330) as shown in FIG. If the thickness of the flange part (101) of the insert piece (100) is the minimum depth (A) of the flange part (331) of the neck part split mold, A + 0.05 mm ≧ a ≧ A−0.30 mm If the diameter of the flange part (101) of the insert piece is b is the diameter (B) of the flange part (331) of the neck part split type, the range is B ≧ b ≧ B−0.60 mm. The diameter (c) of the through-hole (102) for the gate of the piece is in the range of 12.00 mm ≧ c ≧ 3.00 mm. This is because when a> A + 0.05 mm and b> B, the compression limit at the time of clamping is exceeded, and when a <A−0.30 mm and b <B−0.60 mm, the insert piece moves during injection, and c is The diameter is determined by the gate diameter. The 3.00 mm diameter is the resin flow limit, and the 12.00 mm diameter is the resin filling limit. In addition, the thickness of the insert piece is normally produced in the range of 0.50 mm to 3.00 mm.
[0013]
【The invention's effect】
According to the method for manufacturing a two-layer preform of the present invention, it is easy to insert the insert piece at an appropriate position in the mold from the shape of the insert piece, and the insert piece can be inserted into the mold using a general inserter. Moreover, there is no interfacial peeling between the insert piece and the preform body during stretching, and the productivity in manufacturing the preform is stable. And since the insert piece is inserted also into the part which is hard to be extended | stretched, such as a flange part and a bottom part, the bottle obtained by carrying out biaxial stretching blow molding of this preform has the favorable characteristic of a bottle.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the shape of an insert piece, the insertion position in a mold, and the configuration of a two-layer preform in an embodiment of a method for producing a two-layer preform of the present invention.
FIG. 2 (a) is an explanatory view showing the shape of an insert piece, the insertion position in a mold, and the configuration of a two-layer preform in a conventional method for manufacturing a two-layer preform; ) Is an explanatory view showing the shape of the insert piece, the insertion position in the mold, and the configuration of the two-layer preform in another conventional method for manufacturing a two-layer preform.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Preform 100 ...... Insert piece 101, 231 ... Flange part 102 ... Gate through-hole 200 ... Preform body 300 ... Injection mold 310 ... Core mold 320 ... Cavity mold 330 ... ... Neck part split mold 321 ... Gate a ... Insert piece flange part thickness A ... Neck part split part flange depth b ... Insert piece flange part diameter B ... Neck part split part Diameter of flange part c ... Diameter of through hole for gate of insert piece

Claims (1)

外層用インサートピースを射出成形用金型内に前もって挿着して、２軸延伸ブロー成形用プリフォームを製造する方法において、前記射出成形用金型が、コア型とキャビティ型とネック部割型とからなり、前記インサートピースのフランジ部の厚みをａとし、前記ネック部割型のフランジ部の最低深さをＡとすると、Ａ＋０．０５ｍｍ≧ａ≧Ａ−０．３０ｍｍであり、前記インサートピースのフランジ部の径をｂとし、前記ネック部割型のフランジ部の径をＢとすると、Ｂ≧ｂ≧Ｂ−０．６０ｍｍであり、且つ、前記インサートピースのゲート用貫通孔の径をｃとすると、１２．００ｍｍ≧ｃ≧３．００ｍｍであることを特徴とする２層プリフォームの製造方法。 In the method of manufacturing the biaxial stretch blow molding preform by inserting the outer layer insert piece into the injection molding mold in advance, the injection molding mold includes a core mold, a cavity mold, and a neck part split mold. When the thickness of the flange part of the insert piece is a and the minimum depth of the flange part of the neck part split mold is A, A + 0.05 mm ≧ a ≧ A−0.30 mm, and the insert piece If the diameter of the flange portion of the insert piece is b and the diameter of the flange portion of the neck portion split mold is B, then B ≧ b ≧ B−0.60 mm, and the diameter of the through hole for the gate of the insert piece is c Then, a manufacturing method of a two-layer preform, wherein 12.00 mm ≧ c ≧ 3.00 mm.
JP14334998A 1998-05-25 1998-05-25 Method for producing two-layer preform Expired - Fee Related JP3765183B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14334998A JP3765183B2 (en) 1998-05-25 1998-05-25 Method for producing two-layer preform

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Application Number Priority Date Filing Date Title
JP14334998A JP3765183B2 (en) 1998-05-25 1998-05-25 Method for producing two-layer preform

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JP3765183B2 true JP3765183B2 (en) 2006-04-12

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Publication number Priority date Publication date Assignee Title
JP4752128B2 (en) * 2001-04-27 2011-08-17 凸版印刷株式会社 Manufacturing method of two-layer preform
JP2002361716A (en) * 2001-06-08 2002-12-18 Toppan Printing Co Ltd Method for manufacturing two-layered preform
JP2006263948A (en) * 2005-03-22 2006-10-05 Dainippon Printing Co Ltd Preform of bottle container made of plastic and bottle container manufactured therefrom
JP6459041B2 (en) * 2014-12-16 2019-01-30 大日本印刷株式会社 Method for manufacturing composite container and composite container
JP6935139B2 (en) * 2017-12-26 2021-09-15 株式会社吉野工業所 Synthetic resin container

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