JP2004098666A

JP2004098666A - Parison molding process and equipment, parison, and parison fabricating method

Info

Publication number: JP2004098666A
Application number: JP2003282035A
Authority: JP
Inventors: Kimio Takeuchi; 竹内　公生; Takahiro Kurosawa; 黒沢　高博; Isamu Takeda; 武田　勇; Masashi Tanaka; 田中　政資
Original assignee: Toyo Seikan Kaisha Ltd
Current assignee: Toyo Seikan Group Holdings Ltd
Priority date: 2002-08-23
Filing date: 2003-07-29
Publication date: 2004-04-02
Anticipated expiration: 2023-07-29
Also published as: JP4407796B2

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a parison capable of disposing a desired resin in an optional position, causing flashes consisting only of a resin facilitating recycling in a continuous extrusion blow molding, and forming a vessel having different material and color along an axial direction. <P>SOLUTION: A single or multiply layered first resin continuously extruded from first resin extruders 10a-10c is formed into intermittent first parison parts 36 by moving a core member 4 up and down to open and close a first die head outlet 23. Further, a second resin consisting of one or more resins given by one or more second die head outlets 24 other than the first die head outlet is discharged between the intermittent parisons 36 to connect them to form second parisons 37. Two or more resins are disposed in a longitudinal direction of the parison. <P>COPYRIGHT: (C)2004,JPO

Description

　本発明は、パリソンの成形方法及びその成形装置に関し、さらにこれらにより得られたパリソン、そしてこのパリソンを用いて２次成形加工する２次成形加工方法に関する。 The present invention relates to a parison molding method and a molding apparatus thereof, and further relates to a parison obtained by the parison and a secondary molding method for performing secondary molding using the parison.

　従来、押出し成形したパリソンをブロー成形等で二次成形加工して容器を製造する際、容器のガスバリア性や光バリア性あるいは強度や耐化学変化性等を高めるために、複数種の樹脂（又は接着剤）を多層に押出して多層パリソンを成形し、それを二次成形して多層容器を製造することが行われている。その場合、パリソンの成形でピンチオフされたバリも多層となるので、バリに異種の材料が混在しその再利用が困難であるという問題点がある。特に、連続押出ブロー成形法ではブロー型間に一定長さの接続部を必要とするので大量のバリが発生し、それを有効に再利用することは、省資源、コストの低減化の観点からも重要である。この問題点は、ピンチオフ部又は接続部となる部分をパリソン成形部の多層構造に代えて確実に単一樹脂層若しくは再利用に支障のない複数種の樹脂層にすることができれば解決できるので、従来その観点から種々の方策が提案されている。 Conventionally, when a container is manufactured by secondary molding processing of an extruded parison by blow molding or the like, in order to improve the gas barrier property, light barrier property, strength, chemical resistance, etc. of the container, a plurality of types of resins (or It is practiced to produce a multilayer container by extruding an adhesive) into multiple layers to form a multilayer parison and then secondary molding it. In that case, since the burrs pinched off by the molding of the parison are also multi-layered, there is a problem that different materials are mixed in the burrs and it is difficult to reuse them. In particular, the continuous extrusion blow molding method requires a certain length of connection between the blow molds, so a large amount of burrs are generated, and it is possible to effectively reuse them from the viewpoint of resource saving and cost reduction. It is also important. Since this problem can be solved if the pinch-off part or the connection part can be replaced with a multilayer structure of the parison molded part and a single resin layer or a plurality of types of resin layers that do not hinder reuse can be solved, Conventionally, various measures have been proposed from this viewpoint.

　例えば、自動車等の燃料タンクをブロー成形するに際して、パリソンの押出し時、中間樹脂層（例えばバリア層となる樹脂層）が成形型の食い切り部に相当する部位よりも設定量だけキャビティの外側に位置するように、中間樹脂層をダイ内部で間欠的に蓄積して付加して、多層パリソンを押出し成形することが提案されている（特開昭６３−２６０４２４号公報）。また、他の方法として、ダイヘッド吐出口付近に高圧で樹脂を付加することによって、主パリソンを切断して接続部を主パリソンと異なる単一樹脂からなる樹脂で形成するようにしたもの（特許文献１参照）が提案されている。さらに、内層に別成形したプリフォームを用い、押出し樹脂により外側を覆い、ピンチオフ部を外層単独に構成したもの（特許文献２参照）、あるいは内外層を交互に蓄積・射出・ピンチオフするようにしたもの（特許文献３参照）等が提案されている。
特開平１−２６７０２３号公報特許第３２４９０５４号掲載公報特開平１０−１２８８３２号公報 For example, when blow molding a fuel tank of an automobile or the like, when extruding a parison, the intermediate resin layer (for example, a resin layer serving as a barrier layer) is positioned outside the cavity by a set amount from the portion corresponding to the cutout portion of the mold. Thus, it has been proposed to intermittently accumulate and add an intermediate resin layer inside a die to extrude a multilayer parison (Japanese Patent Laid-Open No. 63-260424). As another method, the main parison is cut by adding a resin at a high pressure in the vicinity of the die head discharge port so that the connection portion is formed of a resin made of a single resin different from the main parison (Patent Document) 1) has been proposed. Furthermore, a preform formed separately in the inner layer is used, the outer side is covered with an extruded resin, and the pinch-off part is configured as an outer layer alone (see Patent Document 2), or the inner and outer layers are alternately accumulated, injected, and pinched off. A thing (refer patent document 3) etc. are proposed.
Japanese Patent Laid-Open No. 1-267023 Patent No. 3249054 Japanese Patent Application Laid-Open No. 10-128832

　しかしながら、ダイ内部で中間層を付加すると、樹脂がダイから吐出されるまでの間に、付加樹脂が周方向で不均一な挙動を示し、中間層切断面が長手方向に傾斜が生じ易くなる欠点がある。また、その場合、中間層付加位置から二次成形位置までの距離が大きこと、及びダイ内ではより不安定挙動の影響が大きいことにより、押出機の始動時や再始動時に避けられない樹脂の不安定挙動による悪影響が更に増幅される欠点がある。さらに、ダイ内の樹脂の流れに乱れが生じ易いために、安定した成形を行うには不利であるという欠点もある。
　また、ダイヘッド吐出口付近に高圧で樹脂を付加することによって、主パリソンを切断する方法は、主パリソンを切断するための樹脂をかなり高圧にしなければならない問題点があると共に、主パリソンに対してある程度粘性を持った樹脂を選定しなければならず、樹脂の選択幅が狭まるという問題点もある。
　また、内層に別成形したプリフォームを用い、押出し樹脂により外側を覆い、ピンチオフ部を外層単独に構成する方法は、プリフォームを成形するための別装置・別工程を必要とする。しかもその場合は、連続したパリソンは得られないため、高速成形には不利である。さらに、内外層を交互に蓄積・射出・ピンチオフするようにしたものは、内層及び外層の吐出制御が非常に複雑であると共に、連続したパリソンは得られないため、高速成形には不利であるという欠点がある。 However, when the intermediate layer is added inside the die, the additional resin exhibits a non-uniform behavior in the circumferential direction until the resin is discharged from the die, and the intermediate layer cut surface tends to be inclined in the longitudinal direction. There is. In that case, the distance from the intermediate layer addition position to the secondary molding position is large, and the influence of unstable behavior is larger in the die. There is a disadvantage that the adverse effects due to unstable behavior are further amplified. Further, since the flow of the resin in the die tends to be disturbed, there is a disadvantage that it is disadvantageous for stable molding.
In addition, the method of cutting the main parison by adding resin at a high pressure near the die head discharge port has a problem that the resin for cutting the main parison must be considerably high in pressure. A resin having a certain degree of viscosity must be selected, and there is a problem that the selection range of the resin is narrowed.
Moreover, the method of using the preform separately molded in the inner layer, covering the outside with an extruded resin, and configuring the pinch-off portion as the outer layer alone requires a separate apparatus and a separate process for molding the preform. In addition, in that case, a continuous parison cannot be obtained, which is disadvantageous for high speed molding. Furthermore, it is said that the one that alternately accumulates, injects, and pinches off the inner and outer layers is disadvantageous for high-speed molding because the discharge control of the inner and outer layers is very complicated and a continuous parison cannot be obtained. There are drawbacks.

　また、従来提案されているパリソンは、前記のように厚さ方向には複数樹脂の積層構造になっているもの、あるいは長手方向ではバリとなるところを別材料で形成したものはあるが、二次成形加工部となるパリソンの長手方向には全て同じ樹脂で形成されているため、例えばブロー成形された容器の軸方向に樹脂の材質を変えるとか、あるいは色彩を変えるとか等、ブロー成形容器にデザインや機能性に変化を持たせるのが困難であった。さらに、従来のパリソン成形方法ではパリソンの肉厚を任意に又は部分的に変更したり制御することが困難であった。 In addition, some of the parisons that have been proposed in the past have a laminated structure of a plurality of resins in the thickness direction as described above, or those in which burrs are formed in different directions in the longitudinal direction. Since all the longitudinal direction of the parison that will be the next molding process part is made of the same resin, for example, changing the material of the resin in the axial direction of the blow molded container or changing the color, etc. in the blow molded container It was difficult to change the design and functionality. Furthermore, it is difficult to change or control the wall thickness of the parison arbitrarily or partially by the conventional parison molding method.

　そこで、本発明は従来技術のもつ上記課題を全て解決しようとするもので、パリソン中の所望の樹脂を成形品の任意の位置に配置することができ、連続押出ブロー成形を実施する際に、金型間のバリに相当する部分を１種類の樹脂のみ、もしくはその大部分を１種類の樹脂のみにすることができ、バリ部分を効果的に再利用することができ、あるいはパリソンの長手方向に任意に材質を変えてパリソンを押出成形でき、それにより軸方向に材質や色彩の違う容器を二次成形することができるパリソンの成形方法及び成形装置、さらにこれらにより得られたパリソン、そして該パリソンを用いて２次成形加工する２次成形加工方法を提供することを目的とする。 Therefore, the present invention is intended to solve all the above-mentioned problems of the prior art, the desired resin in the parison can be placed at any position of the molded product, and when performing continuous extrusion blow molding, The part corresponding to the burrs between the molds can be made of only one kind of resin, or most of the parts can be made of only one kind of resin, and the burrs can be effectively reused, or the longitudinal direction of the parison The parison can be extruded by arbitrarily changing the material, whereby a parison molding method and apparatus capable of secondary molding of containers of different materials and colors in the axial direction, and the parison obtained thereby, and the An object of the present invention is to provide a secondary molding method for performing secondary molding using a parison.

　上記問題点を解決する本発明のパリソン成形方法は、第１樹脂押出機より押出される第１樹脂を、第１ダイヘッド吐出口において該第１ダイヘッド吐出口を開閉することにより吐出させ、間欠的な第１パリソン部を形成すると共に、該間欠的な第１パリソン部間を前記第１ダイヘッド吐出口とは異なる一つ以上の第２ダイヘッド吐出口から付与される一つ以上の樹脂からなる第２樹脂により接続することにより、パリソンの長手方向に二つ以上の樹脂を配置することを主な構成としている。 In the parison molding method of the present invention for solving the above-mentioned problems, the first resin extruded from the first resin extruder is discharged by opening and closing the first die head discharge port at the first die head discharge port, and intermittently. A first parison portion is formed, and the intermittent first parison portion is formed from one or more second die head discharge ports different from the first die head discharge ports. The main configuration is to arrange two or more resins in the longitudinal direction of the parison by connecting them with two resins.

　前記第１ダイヘッド吐出ロをダイヘッドの環状樹脂流路の中心に位置するコア又は筒状開閉弁の動作により開閉して、第１樹脂を切断することにより接続部が傾斜することなく、良好に接続することができる。間欠的な前記第１パリソン部を接続する前記第２樹脂は、第１ダイヘッド吐出ロの外周側、もしくは内周側から、あるいは外周側と内周側の両側から付与してもよい。前記第１パリソン部を、複数以上の押出機から押出される樹脂により多層構造とすることによって、例えばバリの再利用を阻害することなしに、バリア性の高い容器等の機能性の高い二次成形容器を得ることができる。また、前記第２パリソン部の一部もしくは全てを、多層構造とすることも可能であり、それにより軸方向に変化に富んだ二次成形容器を得ることができる。　 The first die head discharge roller is opened and closed by the operation of a core or a cylindrical opening / closing valve located at the center of the annular resin flow path of the die head, and the first resin is cut, so that the connection portion is not inclined and the connection portion is inclined. can do. The second resin that intermittently connects the first parison portions may be applied from the outer peripheral side or inner peripheral side of the first die head discharge roller, or from both the outer peripheral side and the inner peripheral side. By forming the first parison part into a multilayer structure with a resin extruded from a plurality of extruders, for example, without inhibiting the reuse of burrs, a secondary having high functionality such as a container having a high barrier property. A molded container can be obtained. In addition, a part or all of the second parison portion may have a multi-layer structure, whereby a secondary molded container rich in changes in the axial direction can be obtained. *

　前記第２樹脂は、容器の形態や樹脂の種類により、前記第１樹脂が吐出されている間は完全に吐出を停止させることもでき、あるいはその一部もしくは全てを、前記第１樹脂が吐出されている間も吐出させることも可能である。そして、前記第２樹脂の一部もしくは全ての流量を常時もしくは定期的に制御することが望ましい。また、前記第１パリソン部及び第２パリソン部が押出されるダイヘッド吐出口の開口量を調整可能とすることにより、肉厚が均一なパリソンを得ることができると共に、部分的に肉厚を変えたパリソンを得ることができ、例えば連続ブロー成形でバリとなる部分の肉厚を薄くすることが可能である。
　さらに、前記第１パリソン部間を前記第２樹脂により接続する際に、前記第１ダイヘッド吐出口の外周側、もしくは内周側、もしくは外周側と内周側から流体を付加することが望ましい。 Depending on the shape of the container and the type of resin, the second resin can be completely stopped while the first resin is being discharged, or a part or all of the second resin can be discharged by the first resin. It is also possible to discharge while being carried out. It is desirable to control the flow rate of a part or all of the second resin constantly or periodically. Moreover, by making it possible to adjust the opening amount of the die head discharge port through which the first parison part and the second parison part are extruded, it is possible to obtain a parison with a uniform wall thickness and to partially change the wall thickness. A parison can be obtained, and for example, it is possible to reduce the thickness of a portion that becomes a burr by continuous blow molding.
Further, when the first parison portions are connected by the second resin, it is desirable to add fluid from the outer peripheral side, the inner peripheral side, or the outer peripheral side and the inner peripheral side of the first die head discharge port.

　上記パリソン成形方法により得られた本発明のパリソンは、少なくとも、厚さ方向に一層又は多層配置された第１樹脂からなる第１パリソン部に、厚さ方向に一層又は多層配置された第２樹脂からなる第２パリソン部が接続されて、パリソンの長手方向に二つ以上の樹脂を配置してなることを特徴とするものである。
　前記第２パリソン部は、バリ部となる場合に限らず、二次成形部の一部となる場合もあり、バリ部となる場合は単一樹脂が望ましいが、二次成形部の一部となる場合は、成形する容器に応じて多層あるいは単層構造とすることができる。また、第２パリソン部は、必ずしも軸方向に一段と限らず、二つ以上の樹脂を配置して２段以上にすることも可能である。 The parison of the present invention obtained by the above-described parison molding method includes at least a second resin arranged in one or more layers in the thickness direction in the first parison portion made of the first resin arranged in one or more layers in the thickness direction. The second parison part is formed by connecting two or more resins in the longitudinal direction of the parison.
The second parison part is not limited to the burr part, but may be a part of the secondary molding part. When the burr part is a single resin, In this case, a multi-layer structure or a single-layer structure can be used depending on the container to be molded. Further, the second parison portion is not necessarily limited to one step in the axial direction, and two or more resins can be arranged to have two or more steps.

　上記パリソンを成形する本発明のパリソン成形装置は、ダイヘッドに、第１樹脂押出機、第２樹脂押出機、前記第１樹脂押出機から押出された溶融樹脂を通過させ端部が第１ダイヘッド吐出口となっている第１樹脂流路、前記第２樹脂押出機から押出された溶融樹脂を通過させ端部が第２ダイヘッド吐出口となっている第２樹脂流路を有し、且つ第１ダイヘッド吐出口を開閉する第１ダイヘッド吐出口開閉手段を有し、前記第１ダイヘッド吐出ロを前記第１ダイヘッド吐出ロ開閉手段が間欠的に閉塞することにより、前記第１樹脂押出機より押出される第１樹脂を間欠的に遮断すると共に、前記第１樹脂に前記第２ダイヘッド吐出口から吐出される第２樹脂が接続されるようにしてなることを主な構成としているる。 In the parison molding apparatus of the present invention for molding the parison, the molten resin extruded from the first resin extruder, the second resin extruder, and the first resin extruder is passed through the die head, and the end portion is discharged from the first die head. A first resin flow path serving as an outlet; a second resin flow path through which the molten resin extruded from the second resin extruder passes and having an end serving as a second die head discharge port; The first die head discharge opening / closing means for opening and closing the die head discharge opening is provided, and the first die head discharge opening / closing means is intermittently closed by the first die head discharge opening / closing means to be pushed out by the first resin extruder. The main structure is that the first resin is intermittently cut off, and the second resin discharged from the second die head discharge port is connected to the first resin.

　前記第１ダイヘッド吐出ロ開閉手段は、ダイヘッドの中心部に位置してコア駆動装置により所定ストロークで変位可能に設けられたコアで構成することができ、またダイヘッドの中央部に位置して所定ストロークで変位可能に設けられた筒状開閉バルブで構成することができる。そして、前記筒状開閉バルブの中心部を貫通して所定ストロークで変位可能にコアを設け、該コアの下端がダイヘッド吐出口の開口量を制御してパリソンの肉厚を制御する肉厚制御部材として構成することによって、ダイヘッド吐出口から押出されるパリソンの肉厚を任意に制御することができる。さらに、パリソンの偏肉及び／又は偏心を調整するパリソン肉厚調整機構を設けることによって、押出すパリソンの偏肉及び／又は偏心を調整することができる。パリソン肉厚調整機構を第１ダイヘッド吐出口より上方に設けることによって、第１パリソンのみの偏肉及び／又は偏心を調整することができる。　 The first die head discharge roller opening / closing means can be constituted by a core located at the center of the die head and displaceable at a predetermined stroke by a core driving device, and is located at the center of the die head at a predetermined stroke. And can be constituted by a cylindrical on-off valve provided so as to be displaceable. A thickness control member that passes through the central portion of the cylindrical on-off valve and is provided with a core that can be displaced by a predetermined stroke, and the lower end of the core controls the opening amount of the die head discharge port to control the thickness of the parison. By configuring as above, the thickness of the parison extruded from the die head discharge port can be arbitrarily controlled. Furthermore, the thickness and / or eccentricity of the parison to be extruded can be adjusted by providing a parison thickness adjusting mechanism for adjusting the thickness and / or eccentricity of the parison. By providing the parison thickness adjusting mechanism above the first die head discharge port, the thickness deviation and / or the eccentricity of only the first parison can be adjusted. *

　前記第１樹脂押出機及び第２樹脂押出機は必ずしも単一の樹脂押出機に限らず、それぞれを１台以上の樹脂押出機群から構成して、前記第１樹脂及び第２樹脂がそれぞれ１層又は多層となって前記第１樹脂流路及び第２樹脂流路を通過することもできる。前記第１樹脂を前記第２樹脂により接続する際に、前記第１ダイヘッド吐出口の外周側、もしくは内周側、もしくは外周側と内周側から流体を付加する流体吹出し口を設けることによって、ダイヘッド吐出口への溶融樹脂の付着を少なくすることができる。 The first resin extruder and the second resin extruder are not necessarily limited to a single resin extruder, and each of them is composed of a group of one or more resin extruders, and each of the first resin and the second resin is 1 It may be a layer or a multilayer and pass through the first resin flow path and the second resin flow path. When connecting the first resin with the second resin, by providing a fluid outlet for adding fluid from the outer peripheral side, the inner peripheral side, or the outer peripheral side and the inner peripheral side of the first die head discharge port, The adhesion of the molten resin to the die head discharge port can be reduced.

　さらに、本発明のパリソン加工方法は、請求項１乃至８により得られたパリソンを用いて２次成形加工を行うときに、該パリソン中の所望の樹脂を成形品の任意の位置に配置することを特徴とするものである。また、本発明の他のパリソン加工方法は、請求項１乃至８により得られたパリソンを用いて連続押出ブローによる２次成形を行うときに、金型間のバリに相当する部分を１種類の樹脂のみ、もしくはその大部分を１種類の樹脂のみにすることを特徴とするものである。 Furthermore, the parison processing method of this invention arrange | positions the desired resin in this parison in arbitrary positions of a molded article, when performing a secondary shaping | molding process using the parison obtained by Claims 1 thru | or 8. It is characterized by. Further, another parison processing method of the present invention is such that when the secondary molding is performed by continuous extrusion blow using the parison obtained in claims 1 to 8, one portion of the portion corresponding to the burr between the dies is formed. It is characterized in that only the resin or most of it is only one kind of resin.

　以上のように本発明によれば、パリソン中の所望の樹脂を成形品の任意の位置に配置することができ、連続押出ブロー成形を実施する際に、金型間のバリに相当する部分を１種類の樹脂のみ、もしくはその大部分を１種類の樹脂のみにすることができ、バリ部分を効果的に再利用することができる。また、パリソンの長手方向に任意に材質を変えてパリソンを押出成形することができ、それにより長手方向に材質や色彩の違う容器を二次成形することができる。特に、本発明によれば、押出成形ダイの内部構造を複雑にすることなく、また、樹脂の切断時に圧力を不当に上げることなく、確実に第１樹脂を切断して第２樹脂を接続したパリソンを得ることができるので、ブロー成形する際に、効果的にバリ部への第１樹脂層の混入を低減させることができ、バリ部の再利用が及ぼす製品への悪影響を最小化することができる。その結果、従来小型のガスバリア性の高い容器のブロー成形で困難であったバリの再利用を促進することができる。さらに、同一ブロー成形容器において、軸方向の材質を任意に変更することができるので、従来にない変化に富んだ容器を成形することも可能である。また、第１ダイヘッド吐出口開閉手段に筒状開閉バルブを採用することによって、第１ダイヘッド吐出口を第２ダイヘッド吐出口又はダイヘッド吐出口と独立して確実に第１ダイヘッド吐出口を開閉でき、またその中心部にコア部材を設けることも可能となり、パリソンの肉厚を任意に制御することができる。 As described above, according to the present invention, a desired resin in a parison can be arranged at an arbitrary position of a molded product, and when performing continuous extrusion blow molding, a portion corresponding to a burr between dies is provided. Only one type of resin or most of it can be made of only one type of resin, and the burr portion can be effectively reused. In addition, the parison can be extrusion molded by arbitrarily changing the material in the longitudinal direction of the parison, whereby secondary containers of different materials and colors can be formed in the longitudinal direction. In particular, according to the present invention, the first resin is reliably cut and the second resin is connected without complicating the internal structure of the extrusion die and without unduly raising the pressure when cutting the resin. Since the parison can be obtained, when blow molding is performed, it is possible to effectively reduce the mixing of the first resin layer into the burr part, and to minimize the adverse effect on the product caused by the reuse of the burr part. Can do. As a result, it is possible to promote the reuse of burrs, which has been difficult in conventional blow molding of small containers with high gas barrier properties. Furthermore, since the material in the axial direction can be arbitrarily changed in the same blow-molded container, it is possible to mold a container rich in changes unprecedented. Further, by adopting a cylindrical opening / closing valve as the first die head discharge port opening / closing means, the first die head discharge port can be reliably opened / closed independently of the second die head discharge port or the die head discharge port, Moreover, it becomes possible to provide a core member in the center part, and the thickness of a parison can be controlled arbitrarily.

　以下、本発明を図１及び図２に示す実施形態により詳細に説明する。図１、２は、第１パリソン部が内層、中間層、外層の３層からなる容器成形部となり、第２パリソン部が第１パリソン部を接続するバリとなるパリソンを連続押出成形するパリソン成形装置１のダイ要部断面図であり、図１は容器をブロー成形する部分となる多層パリソン（第１パリソン部）を成形している状態、図２は前記多層パリソン間のバリとなる連結部分（第２パリソン部）を成形している状態を示している。 Hereinafter, the present invention will be described in detail with reference to the embodiment shown in FIGS. 1 and 2 show a parison molding in which the first parison part is a container molding part consisting of three layers of an inner layer, an intermediate layer, and an outer layer, and the second parison part continuously extrudes a parison that serves as a burr connecting the first parison part. FIG. 1 is a cross-sectional view of a main part of a die of the apparatus 1, in which FIG. 1 is a state where a multi-layer parison (first parison part) that is a part for blow-molding a container is formed, and FIG. The state which has shape | molded (2nd parison part) is shown.

　本実施形態のパリソン成形装置１は、ダイは中空筒状のダイ本体２内に円筒状の内筒３が同心状に設けられ、該内筒３にコア部材４が摺動可能に嵌装されている。コア部材４は、下端に後述する吐出樹脂制御部材３２が設けられ、コア駆動装置５によって、所定のストロークで内筒３内を上下して、吐出樹脂制御部材３２が第１樹脂流路２２の下端部に位置する第１ダイヘッド吐出口２３を開閉し、ダイヘッドから吐出する樹脂を第１パリソン樹脂と第２パリソン樹脂とに切りかえるようになっている。ダイ本体２の外部には、内層となる樹脂を押出す第１樹脂押出機１０ａ、中間層となる樹脂を押出す第１樹脂押出機１０ｂ、外層となる樹脂を押出す第１樹脂押出機１０ｃが設けられている。本実施形態では、これらの第１樹脂押出機１０ａ〜１０ｃで第１の押出機群を構成し第１パリソン樹脂を連続して押出す。ダイ本体２と内筒３との間に第１円筒部材１４が嵌合され、該第１円筒部材１４の内周面と内筒３の外周面との間に円環状の内層樹脂流路１６が形成され、該内層樹脂流路１６に第１樹脂押出機１０ａがアダプターを介して連通し、第１樹脂押出機１０ａにより内層を形成すべく内層用の溶融樹脂を押し出す。 In the parison molding apparatus 1 of the present embodiment, the die is provided with a cylindrical inner cylinder 3 concentrically provided in a hollow cylindrical die body 2, and a core member 4 is slidably fitted into the inner cylinder 3. ing. The core member 4 is provided with a discharge resin control member 32 to be described later at the lower end, and the core drive device 5 moves up and down the inner cylinder 3 with a predetermined stroke so that the discharge resin control member 32 is connected to the first resin flow path 22. The first die head discharge port 23 located at the lower end is opened and closed, and the resin discharged from the die head is switched between the first parison resin and the second parison resin. Outside the die body 2, a first resin extruder 10a that extrudes an inner layer resin, a first resin extruder 10b that extrudes an intermediate layer resin, and a first resin extruder 10c that extrudes an outer layer resin. Is provided. In this embodiment, these 1st resin extruders 10a-10c comprise a 1st extruder group, and 1st parison resin is extruded continuously. A first cylindrical member 14 is fitted between the die body 2 and the inner cylinder 3, and an annular inner layer resin flow path 16 is provided between the inner peripheral surface of the first cylindrical member 14 and the outer peripheral surface of the inner cylinder 3. The first resin extruder 10a communicates with the inner layer resin flow path 16 via an adapter, and the first resin extruder 10a extrudes molten resin for the inner layer to form the inner layer.

　また、前記第１円筒部材１４の下方にダイ本体２と内筒３との間に嵌合して第２円筒部材１７が設けられ、その内周面と前記内層樹脂流路１６の外周面との間で円環状の中間層樹脂流路１９が形成される。第１樹脂押出機１０ｂは、アダプターを介して中間層樹脂流路１９に連通し、中間層を形成すべく溶融樹脂を押出すようになっている。したがって、中間層は、内層の外周面に積層して形成されることになり、第２円筒部材１７の内径によって、中間層の厚みが制御される。そして、前記第２円筒部材１７の下方で、ダイ本体２の内周面と、前記中間層樹脂流路１９の外周面との間に円環状の外層樹脂流路２０が形成され、第１樹脂押出機１０ｃは、アダプターを介して外層を形成すべく溶融樹脂を押出すようになっている。したがって、外層は、中間層の外周面に積層して形成されることになり、外層樹脂流路２０を形成するダイ本体２の内径によって、外層の厚みが制御される。前記内層樹脂流路、中間層樹脂流路、及び外層樹脂流路が一体となって、コア部材との間で多層の第１樹脂流路２２が形成され、その下方部（便宜上図面において地方向を下方として表現するが、装置が縦型や横型によってその方向が相違し、必ずしも物理的な上下を意味するものではない）が、第１ダイヘッド吐出口２３となっている。 Further, a second cylindrical member 17 is provided below the first cylindrical member 14 so as to be fitted between the die body 2 and the inner cylinder 3, and an inner peripheral surface thereof and an outer peripheral surface of the inner layer resin flow path 16 are provided. An annular intermediate layer resin flow path 19 is formed between the two. The first resin extruder 10b communicates with the intermediate layer resin flow path 19 through an adapter, and extrudes molten resin to form an intermediate layer. Therefore, the intermediate layer is formed by being laminated on the outer peripheral surface of the inner layer, and the thickness of the intermediate layer is controlled by the inner diameter of the second cylindrical member 17. An annular outer layer resin flow path 20 is formed below the second cylindrical member 17 between the inner peripheral surface of the die body 2 and the outer peripheral surface of the intermediate layer resin flow path 19. The extruder 10c extrudes molten resin to form an outer layer via an adapter. Therefore, the outer layer is formed by being laminated on the outer peripheral surface of the intermediate layer, and the thickness of the outer layer is controlled by the inner diameter of the die body 2 that forms the outer layer resin flow path 20. The inner layer resin flow path, the intermediate layer resin flow path, and the outer layer resin flow path are integrated to form a multilayer first resin flow path 22 between the core member and a lower portion thereof (for the sake of convenience, the ground direction in the drawing). However, the direction of the apparatus differs depending on whether it is a vertical type or a horizontal type, and does not necessarily mean physical top and bottom).

　本実施形態では、さらにダイ本体２の下方に設けられたダイ外筒２５に、第１パリソン間の第２パリソンを構成する樹脂を押し出すための第２樹脂押出機２６が設けられている。第２樹脂押出機２６は、アキュムレータ２７を有し、プランジャ−２８により溶融樹脂を射出するように構成され、第２樹脂流路２９を介して第１ダイヘッド吐出口２３の外周部近傍に設けられた第２ダイヘッド吐出口２４へと連通している。また、ダイ外筒２５の下端内部には、リング状のパリソン肉厚調整機構３１が設けられ、該パリソン肉厚調整機構の内周面とコア部材４の下端に設けられた吐出樹脂制御部材３２との間で、ダイヘッド吐出口３０を構成している。吐出樹脂制御部材３２は、コア部材４の下端部からテーパー状に下方に向けて拡がっている傾斜部３３を有し、その下方がコア部材の外周面よりも径大で、コア部材４が上昇したときダイ本体の内周面に嵌合して第１ダイヘッド吐出口２３を完全に閉塞できるような円柱面３４となっている。したがって、該円柱面３４の外方に形成されるダイヘッド吐出口３０は、前記第１樹脂流路２２よりも外側に位置することになり、コア部材４が下降している状態で傾斜部３３とダイ本体下端面およびパリソン肉厚調整機構内周面上部との間が、第１パリソン樹脂流路２２とダイヘッド吐出口３０とを連通する連通路となっている。そして、本実施形態では、該連通路に第２樹脂を吐出する第２樹脂流路２９の開口端部である第２ダイヘッド吐出口２４が開口し、第２樹脂流路２９内の第２パリソン樹脂が前記連通路を通過する第１パリソンの外層樹脂の外周面に繋がっている状態にある。なお、吐出樹脂制御部材３２は、コア部材と一体に形成してもよく、別部材で形成して取りつけてもよい。 In the present embodiment, a second resin extruder 26 for extruding the resin constituting the second parison between the first parisons is further provided on the die outer cylinder 25 provided below the die body 2. The second resin extruder 26 has an accumulator 27, is configured to inject molten resin by a plunger 28, and is provided in the vicinity of the outer periphery of the first die head discharge port 23 via a second resin flow path 29. The second die head discharge port 24 communicates. Further, a ring-shaped parison thickness adjusting mechanism 31 is provided inside the lower end of the die outer cylinder 25, and a discharge resin control member 32 provided on the inner peripheral surface of the parison thickness adjusting mechanism and the lower end of the core member 4. The die head discharge port 30 is formed between the two. The discharge resin control member 32 has an inclined portion 33 that extends downward in a tapered manner from the lower end portion of the core member 4. The lower portion is larger in diameter than the outer peripheral surface of the core member, and the core member 4 rises. In this case, the cylindrical surface 34 is formed so that the first die head discharge port 23 can be completely closed by fitting to the inner peripheral surface of the die body. Therefore, the die head discharge port 30 formed outside the cylindrical surface 34 is located outside the first resin flow path 22, and the inclined portion 33 is in a state where the core member 4 is lowered. A space between the lower end surface of the die body and the upper part of the inner peripheral surface of the parison thickness adjusting mechanism is a communication path that communicates the first parison resin flow path 22 and the die head discharge port 30. In this embodiment, the second die head discharge port 24 that is the opening end portion of the second resin flow path 29 that discharges the second resin into the communication path is opened, and the second parison in the second resin flow path 29 is opened. The resin is in a state of being connected to the outer peripheral surface of the outer layer resin of the first parison passing through the communication path. The discharge resin control member 32 may be formed integrally with the core member, or may be formed and attached as a separate member.

　本実施形態のパリソン成形装置は、以上のように構成され、内層、バリア層（中間層）及び外層の３層からなる第１パリソン部３６を、接続樹脂１層からなる第２パリソン部３７を介して連続成形する場合について説明する。
　図１は、第１パリソン部３６を吐出している状態を示し、コア部材４は下方位置に押し下げられ、ダイ吐出口３０は第１ダイ吐出口２３と連通している状態にある。したがって、図示のように第１樹脂押出機１０ａから押出された内層樹脂４０の上に、第１樹脂押出機１０ｂから押出された中間層樹脂４１、第１樹脂押出機１０ｃから押出された外層樹脂４２が順次積層されて第１樹脂となり第１樹脂流路２２を通過し、第１ダイヘッド吐出口２３から吐出され、さらに連通路を通ってダイヘッド吐出口３０から円筒状の第１パリソン部３６となって押出成形される。その際、第２樹脂押出機２６による第２樹脂の押出がなく、第２樹脂は第２ダイヘッド吐出口２４でその先端部を通過している第１樹脂の外層樹脂４２と接しながら停止している状態にあるが、第２樹脂押出機２６から定量の樹脂を押出して、外層樹脂の外周部に付加してもよい。第２樹脂が連続して第１樹脂の外層樹脂の外側に付加される場合、第２樹脂が外層樹脂と同じ樹脂であるならば、それだけ外層樹脂が厚くなり、違う樹脂の場合は、第２樹脂が第１パリソンの外層を構成することになり、第１パリソン部の層が増えることになる。 The parison molding apparatus of the present embodiment is configured as described above, and includes a first parison portion 36 composed of three layers of an inner layer, a barrier layer (intermediate layer) and an outer layer, and a second parison portion 37 composed of one connection resin layer. A case of continuous molding will be described.
FIG. 1 shows a state in which the first parison portion 36 is discharged, the core member 4 is pushed down to a lower position, and the die discharge port 30 is in communication with the first die discharge port 23. Therefore, on the inner layer resin 40 extruded from the first resin extruder 10a as shown, the intermediate layer resin 41 extruded from the first resin extruder 10b and the outer layer resin extruded from the first resin extruder 10c. 42 are sequentially laminated to become the first resin, pass through the first resin flow path 22, discharged from the first die head discharge port 23, and further through the communication path from the die head discharge port 30 to the cylindrical first parison portion 36. And is extruded. At that time, there is no extrusion of the second resin by the second resin extruder 26, and the second resin stops at the second die head discharge port 24 while contacting the outer resin layer 42 of the first resin passing through the tip portion. However, a certain amount of resin may be extruded from the second resin extruder 26 and added to the outer peripheral portion of the outer layer resin. When the second resin is continuously added to the outside of the outer resin of the first resin, if the second resin is the same resin as the outer resin, the outer resin becomes thicker. The resin constitutes the outer layer of the first parison, and the layer of the first parison portion increases.

　次に、コア駆動装置５を作動させて、吐出樹脂制御部材３２の傾斜部３３の下端が、図２に示すように、ダイ本体の内周面と接触して第１ダイヘッド吐出口２３を完全に塞ぐまでコア部材４を上昇させ、第１パリソン樹脂流路２２とダイヘッド吐出口３０との連通を遮断する。それと同時に、アキュムレータ２７のプランジャー２８を作動させ、アキュームされている第２樹脂（接続樹脂）を第２ダイヘッド吐出口２４から射出する。それにより、第１パリソン部が切断されると共に第１パリソン部３６の上端に第２樹脂が連続的に接続され、ダイヘッド吐出口３０から第２樹脂のみが吐出され、第２パリソン部３７が成形される。 Next, the core driving device 5 is operated so that the lower end of the inclined portion 33 of the discharge resin control member 32 comes into contact with the inner peripheral surface of the die body as shown in FIG. The core member 4 is raised until it is closed, and the communication between the first parison resin flow path 22 and the die head discharge port 30 is blocked. At the same time, the plunger 28 of the accumulator 27 is operated, and the accumulated second resin (connection resin) is injected from the second die head discharge port 24. Thereby, the first parison portion is cut and the second resin is continuously connected to the upper end of the first parison portion 36, only the second resin is discharged from the die head discharge port 30, and the second parison portion 37 is molded. Is done.

　したがって、本実施形態によれば、コア駆動装置５を作動させるのみで、瞬時にダイヘッド吐出口３０への樹脂流入を第１パリソン樹脂流から接続樹脂である第２樹脂流に切りかえることができ、第２パリソン部への第１樹脂の混入を効果的に低減することができ、第２パリソン（バリ）の成形材料としての再利用が製品に及ぼす悪影響を最小化でき、バリの再利用を促進させることができる。また、第１パリソン部から第２パリソン部への成形に切りかえる際、第２樹脂は常時第１パリソン部の外層に接触している状態であるから、接続が途切れることなく良好に均一に第１パリソン部及び第２パリソンを交互に連続成形することができる。また、第１樹脂押出機１０ａにより押出されて円筒状の内層樹脂流路１６を所定厚の円筒状になって押出される内層樹脂４０の外周面に中間層樹脂４１を積層状態で押出し、さらに内層樹脂と中間層樹脂が積層して円筒状になって通過する中間層樹脂４１の外周面に外層樹脂を押出して積層するので、溶融樹脂の挙動が安定し、ダイ内部で樹脂が混ざることもなく層厚も一定し均一な層厚を有するパリソンを得ることができ、且つ第１パリソン部３６と第２パリソン部３７を均一な円周面で接続できる。また、本実施形態では、ダイヘッド吐出口にパリソン肉厚調整機構３１を設けたので、パリソンの偏肉又は偏心を確実に調整することができる。 Therefore, according to the present embodiment, the resin inflow to the die head discharge port 30 can be instantaneously switched from the first parison resin flow to the second resin flow that is the connecting resin by only operating the core driving device 5. It is possible to effectively reduce the mixing of the first resin into the second parison part, minimize the adverse effect on the product due to the reuse of the second parison as a molding material, and promote the reuse of the burr Can be made. Further, when switching from the first parison part to the second parison part, the second resin is always in contact with the outer layer of the first parison part. The parison part and the second parison can be alternately continuously formed. Further, the intermediate layer resin 41 is extruded in a laminated state on the outer peripheral surface of the inner layer resin 40 which is extruded by the first resin extruder 10a and is extruded into the cylindrical inner layer resin flow path 16 in a cylindrical shape having a predetermined thickness. Since the outer layer resin is extruded and laminated on the outer peripheral surface of the intermediate layer resin 41 which is laminated and passes through the inner layer resin and the intermediate layer resin, the behavior of the molten resin is stabilized and the resin may be mixed inside the die. In addition, a parison having a uniform layer thickness and a uniform layer thickness can be obtained, and the first parison portion 36 and the second parison portion 37 can be connected with a uniform circumferential surface. Moreover, in this embodiment, since the parison thickness adjustment mechanism 31 was provided in the die head discharge port, it is possible to reliably adjust the thickness or eccentricity of the parison.

　以上のように、第１パリソン部３６と第２パリソン部３７が連続押出成形された連続パリソンを図９に示すように、ダイレクトブロー成形装置４５に送ることにより、第１パリソン部３６に相当する部分がダイレクトブロー成形装置のブロー成形型４６内に位置してブロー成形され、第２パリソン部３７がバリとして除去される。このようにして発生したバリは、全部或いは大部分が単層の材料で形成されているので、そのまま再利用することができ、再利用時に各種の不具合が生じない。本発明の装置によれば、連続押出される第１樹脂を切断して第２樹脂を接続する機構が、コア部材の先端部に形成された吐出口制御部材の上下変位によって瞬時に切替えることができるので、第１樹脂と第２樹脂の接続部を成形方向に直角に形成することができ、第２パリソン部への第１パリソン部の樹脂の混ざりを極力少なくすることができ、且つ安定して成形できる。そして、機構が簡単で高速運転も可能であるので、小型の容器のブロー成形も容易である。従って、例えば第１パリソンの内外層をオレフィン系樹脂、中間層をバリア性の高いエチレン−ビニルアルコール系樹脂で構成し、バリとなる第２パリソン部をオレフィン系の樹脂で構成することによって、従来困難であったバリア性の高い小型容器の連続ブロー成形におけるバリの再利用を促進することができる。 As described above, the continuous parison obtained by continuously extruding the first parison portion 36 and the second parison portion 37 is sent to the direct blow molding device 45 as shown in FIG. 9 to correspond to the first parison portion 36. The portion is blow-molded while being positioned in the blow-molding mold 46 of the direct blow-molding device, and the second parison portion 37 is removed as a burr. Since all or most of the burrs generated in this way are formed of a single layer material, they can be reused as they are, and various problems do not occur at the time of reuse. According to the apparatus of the present invention, the mechanism that cuts the continuously extruded first resin and connects the second resin can be instantaneously switched by the vertical displacement of the discharge port control member formed at the tip of the core member. As a result, the connecting portion of the first resin and the second resin can be formed at right angles to the molding direction, and the mixing of the resin of the first parison portion to the second parison portion can be reduced as much as possible and is stable. Can be molded. Since the mechanism is simple and high-speed operation is possible, blow molding of a small container is easy. Accordingly, for example, the inner and outer layers of the first parison are composed of an olefin resin, the intermediate layer is composed of an ethylene-vinyl alcohol resin having a high barrier property, and the second parison part serving as a burr is composed of an olefin resin. It is possible to promote the reuse of burrs in continuous blow molding of small containers with high barrier properties, which has been difficult.

　また、本実施形態のパリソン成形装置では、コア駆動装置を任意に駆動することで、第１パリソン部３６と第２パリソン部３７の長さを自由に変更することができるから、必ずしも多層パリソンのバリの有効利用を図るのに有効であるばかりでなく、例えば容器を成形する同一パリソン内で、高さ方向に材質あるいは同一材質で色が相違するパリソンを成形することも可能である。したがって、その場合は同一容器で高さ方向に樹脂の性質及び／又は樹脂の色が相違する容器をブロー成形することが可能となり、変化に富んだ容器を得ることができる。 Further, in the parison molding device of the present embodiment, the lengths of the first parison portion 36 and the second parison portion 37 can be freely changed by arbitrarily driving the core driving device. In addition to being effective for effective use of burrs, it is also possible to mold a parison having a different material in the height direction or the same color in the same parison for molding a container. Therefore, in that case, it is possible to blow-mold containers having different properties and / or resin colors in the height direction in the same container, and a container rich in changes can be obtained.

　図３はその場合の一実施形態を示している。
　該実施形態のパリソン成形装置４９は、厚さ方向に単一層からなり、高さ方向に２種類の樹脂からなるパリソンを構成する場合を示し、前記実施形態と同様な部材は同一符号を付し、相違点のみについて説明する（以下に示す各実施形態においても同様とする）。該実施形態において、図１〜２に示す実施形態と主に相違する点は、第１パリソン部が単層となっている点であり、したがって第１樹脂押出機は単一の押出機しか有してない。該図において、中心線から右側は、第１パリソン部４７を押出成形している状態を示し、左側は第２パリソン部４８を押出成形している状態を示している。 FIG. 3 shows an embodiment of that case.
The parison molding device 49 of the embodiment shows a case where a parison is formed of a single layer in the thickness direction and two kinds of resins in the height direction, and members similar to those of the embodiment are given the same reference numerals. Only the differences will be described (the same applies to the following embodiments). In this embodiment, the main difference from the embodiment shown in FIGS. 1 and 2 is that the first parison part is a single layer, and therefore the first resin extruder has only a single extruder. Not done. In the figure, the right side from the center line shows a state where the first parison part 47 is extruded, and the left side shows a state where the second parison part 48 is extruded.

　中心線から右側に示すように、第１樹脂押出機５０から押出された樹脂は、コア部材４の外周面とダイ本体５２の内周面とに形成される円筒状の第１樹脂流路５３を通り、第１ダイへッド吐出口５４から一定の肉厚の円筒状に押出され、第１パリソン部４７を成形する。一方ダイヘッド外筒５５の外周部に第２樹脂押出機２６が設けられ、該第２押出機がアダプターを介して第２樹脂流路５７に連結され、第２樹脂流路の端部は第２ダイヘッド吐出口５８となっている。該第２ダイヘッド吐出口５８は、図３の右側に示すように、コア部材４が下側に位置して第１樹脂を押出している状態でその上方に面するように配置されている。第２樹脂押出機２６には、前記第１樹脂と材質及び／又は色の異なる第２樹脂がアキュムレータ２７に貯留されており、第１パリソン部４７が一定長に達するとコア駆動装置５が作動して、コア部材４が上昇することによって、吐出樹脂制御部材３２の傾斜部３３との境目に位置する樹脂が第２ダイヘッド吐出口５８の端部に当たり第１樹脂と第２樹脂が自動的に接続されると共に第１ダイヘッド吐出口５４が閉塞され、この状態でプランジャー２８が作動してアキュムレータ２７に貯留している第２樹脂が押出され、第１樹脂に接続して第２樹脂による第２パリソン部４８が形成される。このように、第１樹脂と第２樹脂を交互に吐出して接続することによって、第１樹脂と第２樹脂が縦方向に交互につながったパリソンを成形することができる。したがって、例えば、図１０に示すように第１樹脂ａと第２樹脂ｂを色の違う樹脂で構成し、容器の成形部となるパリソンの縦方向中央部を第１樹脂ａで構成し、上下端部を第２樹脂ｂで構成すれば、高さ方向中央部と上下部の色が違う容器をブロー成形することができる。なお、図３における５６は、パリソン肉厚調整機構であり、本実施形態ではダイ中のみに設けてあるが図１及び図２に示すように、樹脂吐出口の下流側或いはその両方に設けても良い。 As shown on the right side from the center line, the resin extruded from the first resin extruder 50 is a cylindrical first resin flow path 53 formed on the outer peripheral surface of the core member 4 and the inner peripheral surface of the die body 52. The first parison portion 47 is formed by being extruded from the first die head discharge port 54 into a cylindrical shape having a constant thickness. On the other hand, the second resin extruder 26 is provided on the outer peripheral portion of the die head outer cylinder 55, and the second extruder is connected to the second resin flow path 57 via an adapter, and the end of the second resin flow path is the second end. A die head discharge port 58 is formed. As shown on the right side of FIG. 3, the second die head discharge port 58 is disposed so as to face the upper side in a state where the core member 4 is located on the lower side and the first resin is extruded. In the second resin extruder 26, a second resin having a material and / or color different from that of the first resin is stored in an accumulator 27. When the first parison portion 47 reaches a certain length, the core driving device 5 is activated. When the core member 4 is raised, the resin located at the boundary with the inclined portion 33 of the discharge resin control member 32 hits the end of the second die head discharge port 58, and the first resin and the second resin are automatically At the same time, the first die head discharge port 54 is closed, and in this state, the plunger 28 is actuated to push out the second resin stored in the accumulator 27 and connect to the first resin to connect the first resin with the second resin. Two parison parts 48 are formed. Thus, the parison in which the first resin and the second resin are alternately connected in the longitudinal direction can be formed by alternately discharging and connecting the first resin and the second resin. Therefore, for example, as shown in FIG. 10, the first resin a and the second resin b are made of resins of different colors, and the longitudinal central portion of the parison, which is a molded part of the container, is made of the first resin a. If the end portion is made of the second resin b, a container having a different color between the central portion in the height direction and the upper and lower portions can be blow-molded. 3 is a parison thickness adjusting mechanism, which is provided only in the die in this embodiment, but is provided on the downstream side of the resin discharge port or both as shown in FIGS. Also good.

　以上の第１実施形態及び第２実施形態は、多層パリソンと単層パリソンの成形装置の基本的構成を示したが、本発明は上記実施形態に限らず種々の設計変更が可能である。
　図４は、単層パリソンの成形装置の変形例であり、本実施形態のパリソン成形装置６０では、第２樹脂流路６２をコア部材６１内に設け、第１樹脂押出機６３にアキュムレータ６４を設けてある。したがって、本実施形態では、間欠的な第１パリソン部４７を接続する第２樹脂が、第１ダイヘッド吐出口６５の内周側から付与される。この場合、第１樹脂押出後、コア部材６１が上昇することによって、第２樹脂押出機２６と第２樹脂流路６２が連通し、第２樹脂に押出機２６による圧力が加えられる。そして、第２樹脂が吐出されることにより、第２ダイヘッド吐出口６６が第１パリソン部４７と接続され、第２パリソン部４８が成形され、第２パリソン部成形後コア部材６１が下降して、第１ダイヘッド吐出口６５を開口すると同時にアキュムレータ６４が作動して第１樹脂を第１ダイヘッド吐出口６５から射出することによって、第１樹脂が第２パリソン部４８に接続される。この時第２樹脂押出機２６と第２樹脂流路６２は、物理的に遮断されるため、第２樹脂の流出は最小限に抑えることができる。なお、本実施形態では、第１パリソン部４７の肉厚調節機構６８を、第２ダイヘッド吐出口より上流側のダイ内部のみに設けてあるが図１及び図２に示すように、樹脂吐出口の下流側或いはその両方に設けても良い。 Although the first embodiment and the second embodiment described above show the basic configuration of the apparatus for forming a multilayer parison and a single-layer parison, the present invention is not limited to the above-described embodiment, and various design changes are possible.
FIG. 4 shows a modification of the single-layer parison molding apparatus. In the parison molding apparatus 60 of this embodiment, a second resin flow path 62 is provided in the core member 61, and an accumulator 64 is provided in the first resin extruder 63. It is provided. Therefore, in the present embodiment, the second resin that connects the intermittent first parison portion 47 is applied from the inner peripheral side of the first die head discharge port 65. In this case, after the first resin is extruded, the core member 61 is raised, whereby the second resin extruder 26 and the second resin flow path 62 communicate with each other, and pressure from the extruder 26 is applied to the second resin. When the second resin is discharged, the second die head discharge port 66 is connected to the first parison portion 47, the second parison portion 48 is formed, and the core member 61 is lowered after the second parison portion is formed. The first resin is connected to the second parison unit 48 by opening the first die head discharge port 65 and operating the accumulator 64 to inject the first resin from the first die head discharge port 65. At this time, since the second resin extruder 26 and the second resin flow path 62 are physically blocked, the outflow of the second resin can be minimized. In this embodiment, the thickness adjusting mechanism 68 of the first parison portion 47 is provided only inside the die on the upstream side of the second die head discharge port. However, as shown in FIGS. 1 and 2, the resin discharge port You may provide in the downstream or both of this.

　図５は、本発明の本実施形態に係るパリソン成形装置のさらに他の実施形態を示している。本実施形態のパリソン成形装置７０では、間欠的な第１パリソン部７１に第２樹脂を第１ヘッド吐出口８０の外周側と内周側の両方から付与して第２パリソン部７２を接続成形している。すなわち、第２樹脂が２種類の樹脂からなり第２パリソン部７２が２層となっている。コア部材は、コア外輪７４とコア内輪７５に同心状に分割形成され、それぞれがコア外輪駆動装置７６及びコア内輪駆動装置７７によって独立して駆動される。第１樹脂流路７８は、ダイ本体７９とコア外輪７４との間に設けられ、その下端部に位置する第１ヘッド吐出口８０をコア外輪７４が上下することによって開閉する。 FIG. 5 shows still another embodiment of the parison molding apparatus according to this embodiment of the present invention. In the parison molding device 70 of the present embodiment, the second parison part 72 is connected and molded by applying the second resin to the intermittent first parison part 71 from both the outer peripheral side and the inner peripheral side of the first head discharge port 80. is doing. That is, the second resin is made of two types of resins, and the second parison portion 72 has two layers. The core member is concentrically divided into a core outer ring 74 and a core inner ring 75, and each is independently driven by a core outer ring drive device 76 and a core inner ring drive device 77. The first resin flow path 78 is provided between the die body 79 and the core outer ring 74, and opens and closes when the core outer ring 74 moves up and down the first head discharge port 80 located at the lower end portion thereof.

　一方、第２樹脂押出機を構成する一方の第２樹脂押出機８１ａは、図１に示す実施形態と同様にダイ外筒８２に取りつけられ、第２樹脂流路８３ａの先端に設けられた第２ダイヘッド吐出口８５ａが第１ダイヘッド吐出口８０の外周側に配置され、間欠的な第１パリソン部を接続する第２樹脂の一方が、第１ダイヘッド吐出口８０の外周側から付与されるようになっている。また、他方の第２樹脂を押出す第２樹脂押出機８１ｂは、ダイ本体７９の外周部に取りつけられ、第２樹脂押出機８１ｂから押出される樹脂が通る環状の第２樹脂流路８３ｂが、コア外輪７４とコア内輪７５との間に設けられ、コア内輪駆動装置７７によりコア内輪７５を上下させることにより、第２樹脂流路８３ｂの下端に位置する第２ダイ吐出口８５ｂを開閉するようになっている。 On the other hand, one second resin extruder 81a constituting the second resin extruder is attached to the die outer cylinder 82 in the same manner as in the embodiment shown in FIG. 1, and is provided at the tip of the second resin flow path 83a. The two-die head discharge port 85a is arranged on the outer peripheral side of the first die head discharge port 80, and one of the second resins connecting the intermittent first parison part is applied from the outer peripheral side of the first die head discharge port 80. It has become. The second resin extruder 81b for extruding the other second resin is attached to the outer peripheral portion of the die body 79, and has an annular second resin flow path 83b through which the resin extruded from the second resin extruder 81b passes. The core inner ring 75 is provided between the core outer ring 74 and the core inner ring 75, and the core inner ring 75 is moved up and down by the core inner ring driving device 77 to open and close the second die discharge port 85b located at the lower end of the second resin flow path 83b. It is like that.

　従って、本実施形態では、第１パリソン部７１を接続する第２樹脂が、第１ダイヘッド吐出ロ８０の外周側と内周側から付与されることになる。図５において、中心線より右側が第１パリソン部を成形している状態を示し、この状態では、コア外輪７４とコア内輪７５とも下降している状態にあり、第１ダイヘッド吐出口８０は開かれており、第１樹脂押出機７８から押し出された第１樹脂が吐出され第１パリソン部７１が成形される。この場合、コア内輪７５も下降している状態にあるが、コア外輪７４のストロークがコア内輪７５のストロークよりも大きいため、コア外輪７４の下端の吐出樹脂制御部材８６の傾斜内周面が、コア内輪下端の吐出樹脂制御部材８７の傾斜外周面と接し、第２ダイヘッド吐出口８５ｂは閉じている状態にある。 Therefore, in the present embodiment, the second resin that connects the first parison portion 71 is applied from the outer peripheral side and the inner peripheral side of the first die head discharge roller 80. In FIG. 5, the right side of the center line shows a state where the first parison portion is formed. In this state, both the core outer ring 74 and the core inner ring 75 are in a lowered state, and the first die head discharge port 80 is opened. The first resin extruded from the first resin extruder 78 is discharged and the first parison portion 71 is molded. In this case, the core inner ring 75 is also lowered, but since the stroke of the core outer ring 74 is larger than the stroke of the core inner ring 75, the inclined inner peripheral surface of the discharge resin control member 86 at the lower end of the core outer ring 74 is The second die head outlet 85b is in contact with the inclined outer peripheral surface of the discharge resin control member 87 at the lower end of the core inner ring.

　この状態からコア外輪駆動装置７６とコア内輪駆動装置７７が作動して、コア外輪７４とコア内輪７５を共に上昇させることによって、コア外輪７４の下端の吐出樹脂制御部材８６が第１ダイヘッド吐出口８０を閉塞して第１樹脂を切断すると共に、第２樹脂押出機８１ａ、８１ｂを同時に作動して、アキュームしている樹脂をプランジャーにより射出する。それにより切断された第１パリソン部７１の切断端部に第２樹脂７２ａ、７２ｂが接続されて第２パリソン部７２の成形が行われる。以下、同様な繰り返しにより、間欠的に第１パリソン部７１と第２パリソン部７２が配置されたパリソンが連続成形される。従って、例えば、第１パリソン部を中心にしてその上下が第２パリソン部７２となっている組み合わせを容器成形パリソン部とすると、中央部が単層で上下が二層からなる容器をブロー成形することができる。又連続ブロー成形装置の金型への挿入を前記の場合より１ピッチずらすと、逆に中央部が二層で上下が単層からなる容器をブロー成形することができる。なお、本実施形態では、間欠的な第１パリソン部７１に第２樹脂を第１ヘッド吐出口８０の外周側と内周側の両方から付与して第２パリソン部７２を接続成形しているため、第１樹脂切断後に第１ヘッド吐出口８０下端部近傍に溶融樹脂が付着しにくくなり、長時間の連続運転に有利である。 From this state, the core outer ring driving device 76 and the core inner ring driving device 77 are operated to raise both the core outer ring 74 and the core inner ring 75, so that the discharge resin control member 86 at the lower end of the core outer ring 74 becomes the first die head discharge port. 80 is closed to cut the first resin, and the second resin extruders 81a and 81b are simultaneously operated to inject the accumulating resin with a plunger. The second resins 72a and 72b are connected to the cut end portions of the first parison portion 71 cut thereby, and the second parison portion 72 is molded. Thereafter, the parison in which the first parison part 71 and the second parison part 72 are intermittently formed is continuously formed by the same repetition. Therefore, for example, when a combination in which the upper and lower sides of the first parison part are the second parison part 72 is a container molding parison part, a container having a single central part and two upper and lower parts is blow-molded. be able to. If the insertion of the continuous blow molding device into the mold is shifted by one pitch from the above case, a container having two layers in the center and a single layer in the upper and lower sides can be blow molded. In the present embodiment, the second parison part 72 is connected and molded by applying the second resin to the intermittent first parison part 71 from both the outer peripheral side and the inner peripheral side of the first head discharge port 80. Therefore, it becomes difficult for the molten resin to adhere to the vicinity of the lower end portion of the first head discharge port 80 after cutting the first resin, which is advantageous for continuous operation for a long time.

　図６は、本発明に係るパリソン成形装置のさらに他の実施形態を示している。本実施形態のパリソン成形装置９０では、図３に示す実施形態の装置の改良したものに相当するので、相違点のみについて説明する。本実施形態の装置の特徴は、前記実施形態の場合と比べて、コア部材内部から第１樹脂切断後に第１ダイヘッド吐出口５４周辺に、圧力空気等の流体を吹出すことによって、第１樹脂切断に伴う溶融樹脂が第１ダイヘッド吐出口周辺に付着するのを防止した点である。即ち、本実施形態のパリソン成形装置９０では、コア部材５１に外部の圧力エア供給装置９１に接続された圧力エア供給路９２を設け、その下端のマニホールドから放射状通路９３となって、コア部材５１の下端の外周部近傍から成形中の樹脂に当たるように多数の圧力エア噴出し口９４を設けてある。該圧力エア噴出口９４からは、図６の右半分に示すように、第１樹脂吐出中は圧力エアは噴出されず、第１ダイヘッド吐出口５４が閉塞されて、第２樹脂が吐出されている間だけ圧力エアを噴出している。それにより、第１樹脂の吐出を邪魔せずに、且つ第１樹脂が、第１ダイヘッド吐出口５４近傍に付着することを効果的に防止することができる。 FIG. 6 shows still another embodiment of the parison molding apparatus according to the present invention. The parison molding apparatus 90 according to the present embodiment corresponds to an improvement of the apparatus according to the embodiment shown in FIG. 3, and only the differences will be described. The feature of the apparatus of this embodiment is that the first resin is blown out from the inside of the core member to the periphery of the first die head outlet 54 after the first resin is cut, as compared with the case of the above embodiment. This is that the molten resin accompanying the cutting is prevented from adhering to the periphery of the first die head discharge port. That is, in the parison molding apparatus 90 of the present embodiment, the core member 51 is provided with a pressure air supply path 92 connected to an external pressure air supply apparatus 91, and a radial passage 93 is formed from the lower manifold of the core member 51. A large number of pressure air ejection ports 94 are provided so as to hit the resin being molded from the vicinity of the outer peripheral portion of the lower end of the nozzle. As shown in the right half of FIG. 6, pressure air is not ejected from the pressure air ejection port 94 during discharge of the first resin, the first die head discharge port 54 is closed, and the second resin is discharged. The pressure air is blown out only while it is. Accordingly, it is possible to effectively prevent the first resin from adhering to the vicinity of the first die head discharge port 54 without disturbing the discharge of the first resin.

　図７は、本発明に係るパリソン成形装置のさらに他の実施形態を示している。本実施形態のパリソン成形装置１００は、図４に示す実施形態の装置を改良したもので、相違点のみについて説明する。本装置では、第２樹脂を第１樹脂の内側から供給しているため、圧力エアの第１ダイヘッド吐出口６５近傍への吹出しを第１ダイヘッド吐出口６５の外周側から噴出するようにした点が相違している。そのため圧力エア噴出口１０１をダイ外筒１０２に設けてある。なお、前記両実施形態において、第１ダイヘッド吐出口６５に噴出する流体は圧力エアに限らず、蒸気や他の液体、ガスでも可能であり、第１パリソン部４７と第２パリソン部４８が配置されたパリソンを連続成形する際にパリソンを膨らませ、あるいは圧縮して前記パリソン同士の接続を容易にする。 FIG. 7 shows still another embodiment of the parison molding apparatus according to the present invention. The parison molding apparatus 100 of the present embodiment is an improvement of the apparatus of the embodiment shown in FIG. 4, and only the differences will be described. In this apparatus, since the second resin is supplied from the inside of the first resin, the blowing of the pressure air to the vicinity of the first die head discharge port 65 is performed from the outer peripheral side of the first die head discharge port 65. Is different. For this purpose, a pressure air jet 101 is provided in the die outer cylinder 102. In both the embodiments, the fluid ejected to the first die head discharge port 65 is not limited to pressure air, and may be vapor, other liquids, or gas, and the first parison portion 47 and the second parison portion 48 are arranged. When the formed parison is continuously formed, the parison is expanded or compressed to facilitate connection between the parisons.

　図８は、本発明に係るパリソン成形装置の更に他の実施形態を示している。
本実施形態のパリソン成形装置１１０は、筒状開閉弁（シャットオフバルブ）とコアの組合せにより、第１ダイヘッド吐出口及びダイヘッド吐出口を制御したものであり、図８で中心線より右側半分が筒状開閉弁が上昇して第１ダイヘッド吐出口を開いている状態を示し、左側半分が筒状開閉弁が下降して第１ダイヘッド吐出口を閉じている状態を示している。図１に示す実施形態と同様な構成は同一符号を付し、相違している構成についてのみ説明する。 FIG. 8 shows still another embodiment of the parison molding apparatus according to the present invention.
The parison molding apparatus 110 of the present embodiment controls the first die head discharge port and the die head discharge port by a combination of a cylindrical on-off valve (shutoff valve) and a core, and the right half of the center line in FIG. The state where the cylindrical on-off valve is raised and the first die head discharge port is opened is shown, and the left half shows the state where the tubular on-off valve is lowered and the first die head discharge port is closed. The same components as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and only different components will be described.

　図中、１１１はダイ本体の内筒３に上下摺動可能に嵌合した円筒状の筒状開閉弁であり、その下方端が、外層樹脂流路と中間層樹脂流路及び内層樹脂流路が合流してなる第１樹脂流路１１３の出口端（第１ダイヘッド吐出口１１２）を完全に閉塞する位置と開放位置に変位するように、その上端部が筒状開閉弁駆動装置１１４に連結されている。筒状開閉弁駆動装置１１４としては、シリンダ、電磁ソレノイド、モータ等適宜の手段が採用できる。 In the figure, 111 is a cylindrical tubular on-off valve fitted to the inner cylinder 3 of the die main body so as to be vertically slidable, and the lower ends thereof are an outer layer resin flow path, an intermediate layer resin flow path, and an inner layer resin flow path. The upper end portion of the first resin flow passage 113 is joined to the cylindrical on-off valve driving device 114 so that the outlet end (first die head discharge port 112) of the first resin flow passage 113 is completely closed and opened. Has been. As the cylindrical on-off valve driving device 114, appropriate means such as a cylinder, an electromagnetic solenoid, and a motor can be adopted.

　上記円筒状の筒状開閉弁１１１の円筒内部には、円柱状のコア部材１１５が上下変位可能に貫通し、適宜のコア駆動装置１２０によって上下動される。コア部材１１５の下方部には、吐出樹脂制御部材１１６が一体に設けられ、該吐出樹脂制御部材１１６とコア部材１１５とでコアを構成している。吐出樹脂制御部材１１６は、コア部材１１５の下端部からテーパー状に下方に向けて拡がっている傾斜部１１７を有し、該傾斜部が上下方向に変位することによって、パリソン肉厚調整機構１１８の内周面１１９との間でパリソンの肉厚を任意に調節できるようになっている。本実施形態では、パリソン肉厚調整機構１１８の内周面１１９は、先搾りの漏斗状に形成され、その下端と吐出樹脂制御部材１１６の傾斜部１１７との隙間がダイヘッド吐出口１２５を構成し、吐出するパリソンの肉厚を規定するようになっている。 The cylindrical core member 115 penetrates through the cylindrical cylindrical on-off valve 111 so as to be vertically displaceable, and is moved up and down by an appropriate core driving device 120. A discharge resin control member 116 is integrally provided below the core member 115, and the discharge resin control member 116 and the core member 115 constitute a core. The discharge resin control member 116 has an inclined portion 117 that is tapered downward from the lower end portion of the core member 115, and the inclined portion is displaced in the vertical direction, whereby the parison thickness adjusting mechanism 118. The wall thickness of the parison can be arbitrarily adjusted between the inner peripheral surface 119 and the inner peripheral surface 119. In this embodiment, the inner peripheral surface 119 of the parison thickness adjusting mechanism 118 is formed in a pre-squeezed funnel shape, and the gap between the lower end thereof and the inclined portion 117 of the discharge resin control member 116 constitutes the die head discharge port 125. The thickness of the parison to be discharged is regulated.

　本実施形態のパリソン成形装置１１０は、以上のように構成され、筒状開閉弁１１１が上昇している状態では、図示のように内層樹脂４０、中間層樹脂４１、外層樹脂４２が順次積層されて第１樹脂となり第１樹脂流路１１３から第１ダイヘッド吐出口１１２を通過し、ダイヘッド吐出口１２５から円筒状の第１パリソン部３６となって押出成形される。その際、第２樹脂押出機２６による第２樹脂の押出がなく、第２樹脂は第２ダイヘッド吐出口２４でその先端部を通過している第１樹脂の外層樹脂４２と接しながら停止している状態にあるが、第２樹脂押出機２６から定量の樹脂を押出して、外層樹脂４２の外周部に付加することもできる。その場合、第２樹脂が外層樹脂と同じ樹脂であるならば、それだけ外層樹脂が厚くなり、違う樹脂の場合は、第２樹脂が第１パリソンの外層を構成することになり，第１パリソン部の層が増えることになる。その際、コアを作動して、吐出樹脂制御部材１１６を適宜量だけ変位させて、その下端とパリソン肉厚調整機構１１８との間の隙間量（即ち、ダイヘッド吐出口１２５の開口量）を調整することによって、成形するパリソンの肉厚を成形中に任意に調節することができる。 The parison molding apparatus 110 of the present embodiment is configured as described above, and in the state where the cylindrical on-off valve 111 is raised, the inner layer resin 40, the intermediate layer resin 41, and the outer layer resin 42 are sequentially laminated as illustrated. The first resin passes through the first die head discharge port 112 from the first resin flow path 113 and is extruded from the die head discharge port 125 into the cylindrical first parison portion 36. At that time, there is no extrusion of the second resin by the second resin extruder 26, and the second resin stops at the second die head discharge port 24 while contacting the outer resin layer 42 of the first resin passing through the tip portion. However, it is also possible to extrude a certain amount of resin from the second resin extruder 26 and add it to the outer peripheral portion of the outer layer resin 42. In that case, if the second resin is the same resin as the outer resin, the outer resin becomes thicker. If the second resin is different, the second resin constitutes the outer layer of the first parison. The number of layers will increase. At that time, the core is operated to displace the discharge resin control member 116 by an appropriate amount to adjust the gap amount between the lower end and the parison thickness adjusting mechanism 118 (that is, the opening amount of the die head discharge port 125). By doing so, the thickness of the parison to be molded can be arbitrarily adjusted during molding.

　次に、シャットオフバルブ駆動装置１１４を駆動して筒状開閉弁を下降させることにより、図８における左側半分に示すように、第１ダイヘッド吐出口１１２が閉塞されると同時に、第２樹脂押出機２６のプランジャー２８を作動させ、アキュームされている第２樹脂（接続樹脂）を第２ダイヘッド吐出口２４から射出する。それにより、第１パリソン部が切断されると共に第１パリソン部３６の上端に第２樹脂が連続的に接続され、ダイヘッド吐出口１２５から第２樹脂のみが吐出され、第２パリソン部３７が成形される。その際も、コア駆動装置１２０によって、吐出樹脂制御部材１１６の位置を調整することによって、任意にパリソンの肉厚を調整することができる。したがって、本実施形態によれば、第１パリソン部及び第２パリソン部の何れの吐出中にも任意にその肉厚を調整することができ、常に所望の肉厚のパリソンを成形することができる。例えば、第２パリソン部が連続ブロー成形におけるバリ部となる場合、第２パリソン部を全部あるいは部分的に肉厚を薄くすることによって、樹脂を節約することができる。 Next, by driving the shut-off valve driving device 114 to lower the cylindrical on-off valve, the first die head discharge port 112 is closed as shown in the left half of FIG. The plunger 28 of the machine 26 is actuated to inject the accumulated second resin (connection resin) from the second die head discharge port 24. Thereby, the first parison portion is cut and the second resin is continuously connected to the upper end of the first parison portion 36, only the second resin is discharged from the die head discharge port 125, and the second parison portion 37 is molded. Is done. At that time, the thickness of the parison can be arbitrarily adjusted by adjusting the position of the discharge resin control member 116 by the core driving device 120. Therefore, according to the present embodiment, the wall thickness can be arbitrarily adjusted during the discharge of either the first parison part or the second parison part, and a parison having a desired wall thickness can always be formed. . For example, when the second parison part becomes a burr part in continuous blow molding, the resin can be saved by reducing the thickness of the second parison part in whole or in part.

　以上、本発明の実施形態について説明したが、本発明のパリソン成形方法、パリソン成形装置、及びそれにより得られたパリソン、及びそれを二次加工する方法並びに装置は、上記実施形態のものに限定されるものでなく、それらの組み合わせ、或いはその技術的思想の範囲内で種々の設計変更が可能である。例えば、本発明では、第２樹脂及び／又は第１樹脂を常時もしくは間欠的に吐出または吐出量を制御するとこによって、パリソンの長手方向に任意に材質を変えてパリソンを成形するが、樹脂を間欠的に及び／又は吐出量を制御して吐出する手段としては、前記実施形態で示したアキュムレータに貯留していてプランジャーで射出する方法のほか、負圧により吸い込んで押出樹脂の吐出を停止させる（デコンプレッション）方法、樹脂流路に流量制御バルブを設けて樹脂の流量を制御する方法、あるいは吐出口に通じる樹脂流路に可動スリーブを設けて流路隙間を制御する方法等任意の手段を採用することができる。
　また、本発明によって得られるパリソンの第１パリソン部及び／又は第２パリソン部の層構成も、単層、２層以上の多層といった様々な層構成にすることが可能である。 As mentioned above, although embodiment of this invention was described, the parison shaping | molding method of this invention, a parison shaping | molding apparatus, the parison obtained by it, and the method and apparatus which secondary-process it are limited to the thing of the said embodiment. However, various modifications can be made within the scope of the combination or the technical idea thereof. For example, in the present invention, the second resin and / or the first resin is constantly or intermittently discharged or the discharge amount is controlled, whereby the parison is molded by arbitrarily changing the material in the longitudinal direction of the parison. As a means to discharge intermittently and / or by controlling the discharge amount, in addition to the method of storing in the accumulator shown in the above embodiment and injecting with a plunger, suction by negative pressure is stopped to stop the discharge of extruded resin Arbitrary means, such as a method of controlling (decompression), a method of controlling the flow rate of the resin by providing a flow rate control valve in the resin flow path, or a method of controlling the flow path gap by providing a movable sleeve in the resin flow path leading to the discharge port Can be adopted.
In addition, the layer configuration of the first parison portion and / or the second parison portion of the parison obtained by the present invention can be various layer configurations such as a single layer and two or more layers.

　本発明は、容器等をブロー成形するための前成形体としてのパリソンばかりでなく、押出成形により形成される筒状成形物の成形法及び装置として利用可能であり、それにより軸方向に層構成の異なる連続した筒状成形物を得ることができる。また、軸方向に材質や色の異なる容器をブロー成形により製造するためのパリソンの製造に好適に適用できる。 INDUSTRIAL APPLICABILITY The present invention can be used not only as a parison as a pre-formed body for blow molding a container or the like, but also as a molding method and apparatus for a cylindrical molded product formed by extrusion molding, thereby forming a layer structure in the axial direction. Can be obtained. Moreover, it can apply suitably for manufacture of the parison for manufacturing the container from which a material and a color differ in an axial direction by blow molding.

本発明の実施形態に係るパリソン成形装置で、第１パリソン部を成形している状態の要部断面図である。It is principal part sectional drawing of the state which has shape | molded the 1st parison part with the parison shaping | molding apparatus which concerns on embodiment of this invention. その第２パリソンを成形している状態の要部断面図である。It is principal part sectional drawing of the state which shape | molds the 2nd parison. 本発明の実施形態に係る他のパリソン成形装置の要部断面図である。It is principal part sectional drawing of the other parison shaping | molding apparatus which concerns on embodiment of this invention. 本発明の実施形態に係るさらに他のパリソン成形装置の要部断面図である。It is principal part sectional drawing of the further another parison shaping | molding apparatus which concerns on embodiment of this invention. 本発明の実施形態に係るさらに他のパリソン成形装置の要部断面図である。It is principal part sectional drawing of the further another parison shaping | molding apparatus which concerns on embodiment of this invention. 本発明の実施形態に係るさらに他のパリソン成形装置の要部断面図である。It is principal part sectional drawing of the further another parison shaping | molding apparatus which concerns on embodiment of this invention. 本発明の実施形態に係るさらに他のパリソン成形装置の要部断面図である。It is principal part sectional drawing of the further another parison shaping | molding apparatus which concerns on embodiment of this invention. 本発明の実施形態に係るさらに他のパリソン成形装置の要部断面図である。It is principal part sectional drawing of the further another parison shaping | molding apparatus which concerns on embodiment of this invention. 本発明のパリソン二次成形加工装置を示す概略断面図である。It is a schematic sectional drawing which shows the parison secondary shaping | molding processing apparatus of this invention. 本発明の他のパリソン二次成形加工装置を示す概略断面図である。It is a schematic sectional drawing which shows the other parison secondary shaping | molding processing apparatus of this invention.

Explanation of symbols

　１、４９、６０、７０、９０、１００、１１０　パリソン成形装置
　２、５２、７９　ダイ本体
　３　内筒
　４、５１、６１、１１５　コア部材
　１０ａ〜１０ｃ、５０、６３、７８　第１樹脂押出機
　１６　内層樹脂流路
　１９　中間層樹脂流路
　２０　外層樹脂流路
　２２、５３、７８、１１３　第１樹脂流路
　２３、５４、６５、８０、１１２　第１ダイヘッド吐出口
　２４、５８、６６、８５ａ〜ｂ　第２ダイヘッド吐出口
　２５、５５、８２、１０２　ダイ外筒
　２６、８１ａ、８１ｂ　第２樹脂押出機
　２７、６４　アキュムレータ
　２８　プランジャー
　２９、５７、６２、８３ａ、８３ｂ　第２樹脂流路
　３０、１２５　ダイヘッド吐出口
　３１、５６、６８、１１８　パリソン肉厚調整機構
　３２、８６、８７、１１６　吐出樹脂制御部材
　３６、４７、７１　第１パリソン部
　３７、４８、７２　第２パリソン部
　７４　コア外輪
　７５　コア内輪
　９２　圧力エア供給路
　９４、１０１　圧力エア噴出口
　１１１　筒状開閉弁
　１１４　筒状開閉弁駆動装置 1, 49, 60, 70, 90, 100, 110 Parison molding device 2, 52, 79 Die body 3 Inner cylinder 4, 51, 61, 115 Core members 10a to 10c, 50, 63, 78 First resin extruder 16 Inner layer resin flow path 19 Intermediate layer resin flow path 20 Outer layer resin flow path 22, 53, 78, 113 First resin flow path 23, 54, 65, 80, 112 First die head outlet 24, 58, 66, 85a-b Second die head discharge port 25, 55, 82, 102 Die outer cylinder 26, 81a, 81b Second resin extruder 27, 64 Accumulator 28 Plunger 29, 57, 62, 83a, 83b Second resin flow path 30, 125 Die head Discharge port 31, 56, 68, 118 Parison thickness adjustment mechanism 32, 86, 87, 116 Discharge resin control member 36, 47, 71 First parison part 3 7, 48, 72 Second parison part 74 Core outer ring 75 Core inner ring 92 Pressure air supply path 94, 101 Pressure air outlet 111 Cylindrical on-off valve 114 Cylindrical on-off valve driving device

Claims

The first resin extruded from the first resin extruder is discharged by opening and closing the first die head discharge port at the first die head discharge port to form an intermittent first parison portion, and the intermittent By connecting the first parison parts with a second resin made of one or more resins provided from one or more second die head discharge ports different from the first die head discharge ports, two first parison portions are connected in the longitudinal direction of the parison. A parison molding method comprising arranging two or more resins.

The said 2nd resin which connects the said 1st parison part intermittently is given from the outer peripheral side of a 1st die head discharge roller, an inner peripheral side, or an outer peripheral side and an inner peripheral side. The parison molding method described in 1.

The parison molding method according to claim 1 or 2, wherein a part or all of the first parison part and / or the second parison part has a multilayer structure.

The parison molding method according to any one of claims 1 to 3, wherein the second resin is not discharged while the first resin is being discharged.

4. The parison molding method according to claim 1, wherein a part or all of the second resin is discharged even while the first resin is discharged.

The parison molding method according to any one of claims 1 to 5, wherein a part or all of the flow rate of the second resin is controlled constantly or periodically.

The parison molding according to any one of claims 1 to 6, wherein the thickness of the parison is adjusted by adjusting an opening amount of a die head discharge port through which the first parison part and the second parison part are extruded. Method.

The fluid is added from the outer peripheral side, the inner peripheral side, or the outer peripheral side and the inner peripheral side of the first die head discharge port when the first parison portions are connected by the second resin. Item 8. The parison molding method according to any one of Items 1 to 7.

At least a second parison portion made of a second resin arranged in a single layer or multiple layers in the thickness direction is connected to a first parison portion made of a first resin arranged in a single layer or multiple layers in the thickness direction, and the length of the parison A parison comprising two or more resins arranged in the direction.

A first resin flow path in which a molten resin extruded from a first resin extruder, a second resin extruder, and the first resin extruder is allowed to pass through the die head; First die head discharge port opening / closing means for passing molten resin extruded from a two resin extruder and having a second resin flow path whose end is a second die head discharge port, and for opening and closing the first die head discharge port The first die head discharge roller is intermittently closed by the first die head discharge roller opening / closing means, thereby intermittently blocking the first resin extruded from the first resin extruder, and A parison molding device characterized in that the second resin discharged from the second die head discharge port is connected to the first resin.

11. The parison molding apparatus according to claim 10, wherein the first die head discharge roll opening / closing means is a core positioned at the center of the die head and displaceable with a predetermined stroke by a core driving device.

11. The parison molding apparatus according to claim 10, wherein the first die head discharge roll opening / closing means is a cylindrical opening / closing valve provided at a central portion of the die head and displaceable with a predetermined stroke. *

A thickness control member that passes through the central portion of the cylindrical on-off valve and is provided with a core that can be displaced by a predetermined stroke, and the lower end of the core controls the opening amount of the die head discharge port to control the thickness of the parison; The parison molding device according to claim 14.

The parison molding apparatus according to any one of claims 10 to 13, further comprising a parison thickness adjustment mechanism that adjusts the deviation and / or eccentricity of the parison.

Each of the first resin extruder and the second resin extruder is composed of one or more resin extruders, and the first resin flow path and the second resin are formed in one layer or multiple layers, respectively. The parison molding device according to any one of claims 10 to 14, wherein the parison molding device is configured to pass through a resin flow path.

When the first resin is connected by the second resin, it has a fluid outlet for adding fluid to the pariso from the outer peripheral side, the inner peripheral side, or the outer peripheral side and the inner peripheral side of the first die head discharge port. Item 16. A parison molding device according to any one of Items 10 to 15.

A parison processing method, wherein when a secondary molding process is performed using the parison obtained according to claim 1 to 9, a desired resin in the parison is arranged at an arbitrary position of the molded product.

When performing secondary molding by continuous extrusion blow using the parison obtained according to claims 1 to 9, only one type of resin corresponds to the burr between the molds, or most of the type corresponds to one type of resin. The parison processing method characterized by making it into only.