JP2000117818A - Method and apparatus for molding composite parison - Google Patents
Method and apparatus for molding composite parisonInfo
- Publication number
- JP2000117818A JP2000117818A JP10291600A JP29160098A JP2000117818A JP 2000117818 A JP2000117818 A JP 2000117818A JP 10291600 A JP10291600 A JP 10291600A JP 29160098 A JP29160098 A JP 29160098A JP 2000117818 A JP2000117818 A JP 2000117818A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- parison
- plunger
- molten
- resin supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、例えば自動車のエ
ンジン吸気系等に用いられるエアダクトのブロー成形用
複合パリソンの成形方法および装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a composite parison for blow molding an air duct used in, for example, an engine intake system of an automobile.
【0002】[0002]
【従来の技術】従来、この種のブロー成形エアダクトと
しては、長さ方向に材質配分の異なる単一の多層パリソ
ン、例えば、硬質樹脂層と軟質樹脂層の積層構造であっ
て、硬質樹脂層の肉厚比率の高い剛性部と軟質樹脂層の
肉厚比率の高い柔軟部とを長さ方向に一連に形成したパ
リソンをブロー成形したものが知られている。2. Description of the Related Art Conventionally, a blow-molded air duct of this type has a single multi-layer parison having different material distributions in a longitudinal direction, for example, a laminated structure of a hard resin layer and a soft resin layer. There is known a blow molding of a parison in which a rigid portion having a high thickness ratio and a flexible portion having a high thickness ratio of a soft resin layer are formed in series in the length direction.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、上記の
パリソンにおいては、パリソン押出ヘッド内の各樹脂供
給路に残存する樹脂に強い内圧が発生しており、一方の
樹脂の押出ヘッド出口からの吐出に伴って他方の樹脂も
引きずられて吐出するいわゆる樹脂の後引き現象により
各樹脂の押出量の調整を迅速に行うことが困難であり、
硬質合成樹脂層と軟質合成樹脂層の肉厚比率は徐々にな
だらかにしか変更できず、優れた柔軟性が要求される柔
軟部(ダクトの蛇腹部や両端の連結部)に硬質樹脂が悪
影響を及ぼし、一方形状保持のため十分な剛性を付与す
べき剛性部に軟質樹脂が悪影響を及ぼす問題があった。However, in the above-mentioned parison, a strong internal pressure is generated in the resin remaining in each resin supply passage in the parison extrusion head, and one of the resins is discharged from the extrusion head outlet. It is difficult to quickly adjust the extrusion amount of each resin due to the so-called resin back-drawing phenomenon in which the other resin is also dragged and discharged.
The thickness ratio of the hard synthetic resin layer and the soft synthetic resin layer can be changed only gradually, and the hard resin adversely affects the flexible parts (bellows part of the duct and connecting parts at both ends) where excellent flexibility is required. On the other hand, there is a problem that the soft resin adversely affects the rigid portion to be provided with sufficient rigidity for maintaining the shape.
【0004】本発明は、上記の問題に鑑み、異なる樹脂
材料をその押出量を調整しつつ長さ方向に材質配分の異
なるパリソンを成形するにあたり、樹脂の切り換えをシ
ャープに行うことにより各樹脂層の肉厚比率を局部的に
変更して、材質配分したパリソンの品質を低下させずそ
の特性を十分発揮させることのできる複合パリソンの成
形方法および装置を提供することを課題とするものであ
る。The present invention has been made in view of the above problems, and in forming parisons having different material distributions in the length direction while adjusting the extrusion amount of different resin materials, the resin switching is performed sharply by changing the resin. It is an object of the present invention to provide a method and an apparatus for forming a composite parison in which the wall thickness ratio of the composite parison can be sufficiently exhibited without deteriorating the quality of the material-allocated parison.
【0005】[0005]
【課題を解決するための手段】本発明は、上記の課題を
解決するため、下記の構成を手段とするものである。Means for Solving the Problems The present invention has the following means to solve the above-mentioned problems.
【0006】(1)別個の押出機内で溶融された少なく
とも2種類の溶融樹脂を各々の樹脂供給路を通じて共通
の押出ヘッド内で合流させるとともに上記押出ヘッドの
環状スリットから押し出して単一のパリソンを成形する
方法であって、押出機から送り出された各溶融樹脂を各
々のアキュームレータ式射出機に一時的に貯えたうえ、
それぞれのプランジャを前進させて各溶融樹脂の各樹脂
供給路への押出量を調整する工程において、一方のプラ
ンジャの前進とこれに対応する他方のプランジャのサッ
クバック動作の制御を行い、一方の溶融樹脂を樹脂供給
路への押し出すとともに他方の樹脂供給路に残存する溶
融樹脂を吸引することにより、押出ヘッドの環状スリッ
トから吐出されるパリソンの各樹脂層の肉厚比率を急激
に変更できるようにしたことを特徴とする複合パリソン
成形方法。(1) At least two types of molten resins melted in separate extruders are merged in a common extrusion head through respective resin supply paths, and are extruded from an annular slit of the extrusion head to form a single parison. A method of molding, in which each molten resin sent from the extruder is temporarily stored in each accumulator type injection machine,
In the step of adjusting the extrusion amount of each molten resin to each resin supply path by advancing each plunger, the forward movement of one plunger and the control of the suck-back operation of the other plunger corresponding to this are performed, and By extruding the resin into the resin supply path and sucking the molten resin remaining in the other resin supply path, the thickness ratio of each resin layer of the parison discharged from the annular slit of the extrusion head can be changed rapidly. A composite parison molding method.
【0007】(2)押出ヘッドに設けた環状スリットに
連通する少なくとも2つの環状の樹脂供給路と、各樹脂
供給路に接続したアキュームレータ式射出機と、各アキ
ュームレータ式射出機に連結されそれぞれ異質の溶融樹
脂を供給する押出機とを備え、成形するパリソンの材質
配分に応じてアキュームレータ式射出機のプランジャ相
互の前進およびサックバック動作を制御する制御装置を
設けたことを特徴とする複合パリソン成形装置。(2) At least two annular resin supply paths communicating with the annular slits provided in the extrusion head, an accumulator type injector connected to each resin supply path, and different accumulator type injectors connected to each accumulator type injector. An extruder for supplying a molten resin, and a control device for controlling the mutual advance and suck-back operation of the plungers of the accumulator-type injection machine in accordance with the material distribution of the parison to be formed. .
【0008】[0008]
【実施例】以下、本発明の実施例について図面に基づい
て説明する。図1は本発明に係る複合パリソンの断面
図、図2は複合パリソンの他の実施例を示す断面図、図
3は図2に示す複合パリソンがブロー成形されたエアダ
クトの断面図、図4は本発明にかかる成形方法が実施さ
れる装置の一例を示す模式図、図5は肉厚比率変更部の
成形状態を示す説明図である。Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a composite parison according to the present invention, FIG. 2 is a sectional view showing another embodiment of the composite parison, FIG. 3 is a sectional view of an air duct in which the composite parison shown in FIG. 2 is blow-molded, and FIG. FIG. 5 is a schematic diagram illustrating an example of an apparatus in which a molding method according to the present invention is performed, and FIG. 5 is an explanatory diagram illustrating a molding state of a thickness ratio changing unit.
【0009】図1において、パリソンPは、軟質樹脂層
1と硬質樹脂層2が一部において積層された多層の単一
パリソンであり、軟質樹脂層1に対して硬質樹脂層2の
厚さ比率が高くパリソン肉厚の大部分を構成する剛性部
3,3と、軟質樹脂層1がパリソン肉厚の全部を構成す
る柔軟部4,4が、両者の境界部において樹脂切り換え
に伴って形成される肉厚比率変更部5,5を介して長手
方向に沿って交互に連接されている。本実施例では、熱
可塑性エラストマー(TPE)などからなる軟質樹脂層
1を内層に、HDPE樹脂やポリプロピレン樹脂などか
らなる硬質樹脂層2を外層に配設している。In FIG. 1, a parison P is a multilayer single parison in which a soft resin layer 1 and a hard resin layer 2 are partially laminated, and a thickness ratio of the hard resin layer 2 to the soft resin layer 1 is shown. The rigid portions 3 and 3 which make up a large part of the parison thickness and the flexible portions 4 and 4 where the soft resin layer 1 makes up the entire parison thickness are formed at the boundary between the two with the resin switching. Are connected alternately along the longitudinal direction via the thickness ratio changing portions 5 and 5. In this embodiment, a soft resin layer 1 made of a thermoplastic elastomer (TPE) or the like is provided in an inner layer, and a hard resin layer 2 made of an HDPE resin or a polypropylene resin is provided in an outer layer.
【0010】そして、剛性部3から柔軟部4へ、柔軟部
4から剛性部3への樹脂の切り換えがシャープになさ
れ、肉厚比率変更部5,5のパリソン長手方向に沿う長
さdは非常に短く、例えばパリソンPの肉厚tの0.5
〜1.5の比率の寸法に形成され、パリソンPの肉厚t
が8mmのとき肉厚比率変更部5,5の長さdは略4〜1
2mmの範囲に形成される。The switching of the resin from the rigid portion 3 to the flexible portion 4 and from the flexible portion 4 to the rigid portion 3 is sharp, and the length d of the thickness ratio changing portions 5 and 5 along the parison longitudinal direction is extremely large. And the thickness t of the parison P is 0.5, for example.
The thickness t of the parison P
Is 8 mm, the length d of the thickness ratio changing portions 5, 5 is approximately 4-1.
It is formed in a range of 2 mm.
【0011】図2は、柔軟部4,4においてパリソン肉
厚の大部分を構成する軟質樹脂層1の外側に薄肉の硬質
樹脂層2を積層して、パリソンの全長に亘り多層とした
パリソンP’の例を示し、その他の構造は図1のパリソ
ンPと同等であるので同一符号を付してその説明を省略
する。FIG. 2 shows a parison P formed by laminating a thin hard resin layer 2 on the outside of a soft resin layer 1 constituting a large part of the parison thickness in the flexible portions 4 and 4 to form a multilayer over the entire length of the parison. ', And other structures are the same as those of the parison P shown in FIG.
【0012】図3は、上記パリソンPを図示しない1対
の金型間に挟み込んでパリソンの両端を絞った状態でパ
リソン内に加圧エアを吹き込み、パリソンを膨らませて
金型内面に押しつけてブロー成形して形成したエアダク
トTを示し、パリソンPの柔軟部4,4が屈曲性を要求
される蛇腹部6およびシール性を要求されるジョイント
部7に、剛性部3,3が形状保持部8,8に形成されて
いる。このエアダクトTにおいては、柔軟性に富む蛇腹
部6やジョイント部7と形状を保持するため剛性を必要
とする形状保持部8,8との境界部9が極めてシャープ
であり、軟質樹脂の柔軟性が硬質樹脂の存在により、ま
た逆に硬質樹脂の剛性が軟質樹脂の存在により悪影響を
受けることが殆どない。FIG. 3 shows that the parison P is sandwiched between a pair of molds (not shown), and pressurized air is blown into the parison while both ends of the parison are squeezed, thereby inflating the parison and pressing the parison against the inner surface of the mold. This shows an air duct T formed by molding, and the flexible portions 4 and 4 of the parison P have a bellows portion 6 that requires bending and a joint portion 7 that requires sealing, and rigid portions 3 and 3 have shape holding portions 8. , 8 are formed. In the air duct T, the boundary 9 between the bellows portion 6 and the joint portion 7, which are rich in flexibility, and the shape holding portions 8, 8, which require rigidity for holding the shape, is extremely sharp, and the flexibility of the soft resin is improved. Is hardly adversely affected by the presence of the hard resin, and conversely, the rigidity of the hard resin is adversely affected by the presence of the soft resin.
【0013】図4は本発明方法が実施される装置で、複
合パリソン成形装置の押出ヘッド11内の略中央部にマ
ンドレル12が配設され、このマンドレル12の周囲には
環状の第1樹脂供給路13がその軸方向に沿って形成さ
れ、さらに第1樹脂供給路13の外側には内管部材15に
より仕切られた環状の第2樹脂供給路14が形成され、こ
の第2樹脂供給路14はその流路がマンドレル12の軸方向
に沿うように外管部材16により仕切られている。第1
および第2樹脂供給路13,14はそれぞれの下端部で合流
し、ノズル17とマンドレル12間に形成される環状スリッ
ト18に連通しており、この環状スリット18からパリ
ソンが吐出される。FIG. 4 shows an apparatus in which the method of the present invention is carried out. A mandrel 12 is disposed substantially at the center of the extrusion head 11 of the composite parison molding apparatus, and an annular first resin supply is provided around the mandrel 12. A passage 13 is formed along the axial direction, and an annular second resin supply passage 14 partitioned by an inner pipe member 15 is formed outside the first resin supply passage 13. Is separated by an outer pipe member 16 so that its flow path extends along the axial direction of the mandrel 12. First
The second resin supply passages 13 and 14 join at their lower ends, and communicate with an annular slit 18 formed between the nozzle 17 and the mandrel 12, and a parison is discharged from the annular slit 18.
【0014】上記第1樹脂供給路13および第2樹脂供
給路14の上方部分はヘッド11の側面方向に屈曲され、
第1樹脂供給路13にはシリンダ19駆動のプランジャ
20を備えるアキュムレータ式射出機21が連結され、
このアキュムレータ式射出機21には第1の溶融樹脂を
流入する押出機22が連結され、第1樹脂供給路14に
はシリンダ23駆動のプランジャ24を備えるアキュム
レータ式射出機25が連結され、このアキュムレータ式
射出機25には第2の溶融樹脂を流入する押出機26が
連結されている。The upper portions of the first resin supply path 13 and the second resin supply path 14 are bent in the side direction of the head 11,
An accumulator type injection machine 21 having a plunger 20 driven by a cylinder 19 is connected to the first resin supply path 13,
An extruder 22 for flowing a first molten resin is connected to the accumulator-type injector 21, and an accumulator-type injector 25 having a plunger 24 driven by a cylinder 23 is connected to the first resin supply path 14. An extruder 26 for flowing the second molten resin is connected to the type injection machine 25.
【0015】而して、一方の押出機22には低密度ポリ
エチレン(LDPE)や熱可塑性エラストマー(TP
E)等の軟質樹脂が、他方の押出機26には高密度ポリ
エチレン(HDPE)やポリプロピレン(PP)等の硬
質樹脂が各々供給されるとともに溶融化され、それぞれ
対応するアキュムレータ式射出機21,25に送り込ま
れ、このときそれぞれのアキュムレータ式射出機21,
25の先端に設けた開閉弁(図示せず)を共に閉じた状
態にして溶融樹脂を一時的に貯溜し、この貯溜した溶融
樹脂を各樹脂供給路13,14に向けて流入させるプラ
ンジャ20,24の前進およびサックバック動作を制御
する制御装置27が設けられている。The extruder 22 has a low density polyethylene (LDPE) or a thermoplastic elastomer (TP).
E) or the like, and the other extruder 26 is supplied with a hard resin such as high-density polyethylene (HDPE) or polypropylene (PP) and is melted, and the corresponding accumulator-type injectors 21 and 25 are supplied. At this time, each accumulator type injection machine 21,
The on-off valve (not shown) provided at the end of the nozzle 25 is closed to temporarily store the molten resin, and the plungers 20, which allow the stored molten resin to flow toward the resin supply passages 13 and 14. There is provided a control device 27 for controlling the forward and suckback operations of the motor 24.
【0016】以上のような複合パリソン成形装置により
図1に示した柔軟部4と剛性部3を長さ方向に沿って連
接した複合パリソンPを成形する場合には、一方の樹脂
供給路(内層形成用)13を軟質樹脂用の通路、他方の
樹脂供給路(外層形成用)14を硬質樹脂用の通路とし
て使用し、各樹脂供給路13,14に連通するアキュム
レータ式射出機21,25には、前述したように各押出
機22,26から対応する溶融樹脂が所定量送り込まれ
て一時的に貯えられている。そして、一方のアキュムレ
ータ式射出機21の開閉弁を開いてそのプランジャ20
を所定寸法前進させ溶融状態の軟質樹脂を第1樹脂供給
路13を通り環状スリット18から押し出して、パリソン
Pの軟質樹脂層1、主にその肉厚比率の高い柔軟部4に
対応する部分を成形する。次に、前記開閉弁を開いた状
態のままプランジャ20の前進を停止してから、他方の
アキュムレータ式射出機21の開閉弁を開いてそのプラ
ンジャ24を所定寸法前進させ溶融状態の硬質樹脂を第
2樹脂供給路14を通り環状スリット18から押し出し
て、パリソンPの硬質樹脂層2、主にその肉厚比率の高
い剛性部3に対応する部分を成形し、続いてその開閉弁
を開いた状態のままプランジャ24の前進を停止した
後、一方のプランジャ20を前進させて柔軟部4を形成
し、剛性部3と柔軟部4とが一連に交互に連接し一体とな
ったパリソンPが成形される。その後、前記両開閉弁を
閉じて各溶融樹脂を各アキュムレータ式射出機21,2
5に貯溜するというように、基本的には、上記の工程を
繰り返すことにより、パリソンPが間欠的に連続成形さ
れる。When a composite parison P in which the flexible part 4 and the rigid part 3 shown in FIG. 1 are connected along the length direction by the composite parison molding apparatus as described above is molded, one resin supply path (the inner layer) is used. The resin supply passage (for forming the outer layer) 14 is used as a passage for the hard resin, and the accumulator type injection machines 21 and 25 communicating with the resin supply passages 13 and 14 are used. As described above, a predetermined amount of molten resin is fed from each of the extruders 22 and 26 and temporarily stored therein. Then, the on-off valve of one accumulator-type injection machine 21 is opened, and the plunger 20 is opened.
Is advanced by a predetermined dimension, and the soft resin in the molten state is extruded from the annular slit 18 through the first resin supply path 13, and the portion corresponding to the soft resin layer 1 of the parison P, mainly the flexible portion 4 having a high wall thickness ratio is removed. Molding. Next, after the advance of the plunger 20 is stopped while the on-off valve is open, the on-off valve of the other accumulator-type injection machine 21 is opened, the plunger 24 is advanced by a predetermined dimension, and the molten hard resin is removed. 2 Extruded from the annular slit 18 through the resin supply passage 14 to form the hard resin layer 2 of the parison P, mainly the portion corresponding to the rigid portion 3 having a high wall thickness ratio, and then the on-off valve is opened. After stopping the advance of the plunger 24 as it is, one of the plungers 20 is advanced to form the flexible portion 4, and the parison P in which the rigid portions 3 and the flexible portions 4 are connected alternately in a series to form an integrated parison P is formed. You. After that, both the on-off valves are closed and each molten resin is injected into each accumulator type injection machine 21, 21.
Basically, the parison P is intermittently continuously formed by repeating the above-described steps, such as storing the parison P5.
【0017】しかるに、本発明では、剛性部3と柔軟部
4の境界部において各樹脂の切り換えにより形成される
パリソンPの肉厚比率変更部5の成形工程において、一
方のプランジャの前進開始に伴い、他方のプランジャが
サックバック動作をして所定寸法後退して停止するよう
に制御されている。すなわち、図5は、パリソンPが剛
性部3から柔軟部4へ肉厚比率変更部5を介して切り替え
られる際になされるプランジャ20,24相互のストロ
ーク量の制御を模式的に示したもので、剛性部3の成形
にあたっては、各樹脂層の厚さ比率に対応させて、プラ
ンジャ24が前進動作して多量の溶融硬質樹脂を第2樹
脂供給路14に送り込むのに対して、プランジャ20は微
量の溶融軟質樹脂を第1樹脂供給路13に送り込む。次
に、パリソンPの肉厚比率変更部5の開始位置5aに到
達すると、プランジャ24がサックバック動作を開始し
肉厚比率変更部5の終了位置5bに至るまで後退しその
位置で停止し、一方、プランジャ20はパリソンPの肉
厚比率変更部5の開始位置5aに到達すると、所定距離
だけ前進するように動作を開始し肉厚比率変更部5の終
了位置5bを通過して柔軟部4の成形に至るまで前進し
て、多量の溶融軟質樹脂を第1樹脂供給路13に送り込
む。そのため、プランジャ24のサックバック動作によ
りこれに連通している第2樹脂供給路14内の溶融硬質樹
脂が後方に真空吸引されるとともに、プランジャ20に
より第1樹脂供給路に送り込まれた溶融軟質樹脂が急激
に環状スリット18から吐出されることになり、ごく短
い肉厚比率変更部5をもって剛性部3から柔軟部4へ樹脂
切り換えがなされるに至る。逆に、柔軟部4から剛性部3
への樹脂切り換えも、図示しないがプランジャのストロ
ーク制御により同様に行われる。However, according to the present invention, in the molding process of the wall thickness ratio changing portion 5 of the parison P formed by switching between the resins at the boundary portion between the rigid portion 3 and the flexible portion 4, as one plunger starts to advance. The other plunger is controlled so as to perform a suck-back operation, retreat a predetermined dimension, and stop. That is, FIG. 5 schematically shows the control of the stroke amount between the plungers 20 and 24 when the parison P is switched from the rigid portion 3 to the flexible portion 4 via the thickness ratio changing portion 5. In forming the rigid portion 3, the plunger 24 moves forward to feed a large amount of molten hard resin into the second resin supply path 14 in accordance with the thickness ratio of each resin layer, whereas the plunger 20 A small amount of molten soft resin is fed into the first resin supply path 13. Next, when reaching the start position 5a of the thickness ratio changing unit 5 of the parison P, the plunger 24 starts a suck-back operation, retreats to reach the end position 5b of the thickness ratio changing unit 5, and stops at that position. On the other hand, when the plunger 20 reaches the start position 5a of the thickness ratio changing unit 5 of the parison P, it starts to move forward by a predetermined distance, passes through the end position 5b of the thickness ratio changing unit 5, and passes through the flexible unit 4. And a large amount of molten soft resin is fed into the first resin supply path 13. Therefore, the sucked-back operation of the plunger 24 causes the molten hard resin in the second resin supply path 14 communicating therewith to be sucked in vacuum backward, and the molten soft resin fed into the first resin supply path by the plunger 20. Is rapidly discharged from the annular slit 18, and the resin is switched from the rigid portion 3 to the flexible portion 4 with the very short thickness ratio changing portion 5. Conversely, from the flexible part 4 to the rigid part 3
Although not shown, resin switching is similarly performed by controlling the stroke of the plunger.
【0018】前述したプランジャ20,24相互のスト
ローク制御は、シリンダ19,23に設けられた各プラ
ンジャの前進後退による位置を検出するセンサ28,2
9が制御部27に接続され、このセンサ25,26からの
検出位置を適切な動作パターンをプログラムとして記憶
させてある制御部27にフィードバックし、その制御の下
に油圧作業バルブ(図示せず)へ所定のストロークをと
るように信号を送ることにより行われる。The stroke control between the plungers 20 and 24 is performed by sensors 28 and 2 for detecting the positions of the plungers provided in the cylinders 19 and 23 as the plungers move forward and backward.
9 is connected to the control unit 27, and the detected position from the sensors 25 and 26 is fed back to the control unit 27 in which an appropriate operation pattern is stored as a program, and a hydraulic work valve (not shown) is controlled under the control. This is done by sending a signal to take a predetermined stroke.
【0019】図2に示すパリソンP’の成形操作も前記
とほぼ同様に行われるが、柔軟部4の成形の際にプラン
ジャ24を微速ながら前進させて、薄皮の硬質樹脂層2
を形成するようにしたものである。The molding operation of the parison P ′ shown in FIG. 2 is performed in substantially the same manner as described above, except that the plunger 24 is advanced at a very low speed during the molding of the flexible portion 4 so that the thin hard resin layer 2 is formed.
Is formed.
【0020】[0020]
【発明の効果】本発明によれば、硬質樹脂層の肉厚比率
の高い剛性部と軟質樹脂層の肉厚比率の高い柔軟部とを
長さ方向に連接して形成したブロー成形用パリソンにお
いて、剛性部と柔軟部の境界部に形成される肉厚比率変
更部を著しく短い範囲に抑制でき、パリソンの材質配分
の上で品質を向上させることができる。According to the present invention, there is provided a parison for blow molding in which a rigid portion having a high thickness ratio of a hard resin layer and a flexible portion having a high thickness ratio of a soft resin layer are connected in the longitudinal direction. In addition, the thickness ratio changing portion formed at the boundary between the rigid portion and the flexible portion can be suppressed to a remarkably short range, and the quality can be improved by distributing the parison material.
【図1】本発明に係る複合パリソンの断面図である。FIG. 1 is a cross-sectional view of a composite parison according to the present invention.
【図2】複合パリソンの他の実施例を示す断面図であ
る。FIG. 2 is a sectional view showing another embodiment of the composite parison.
【図3】図1に示す複合パリソンがブロー成形されたエ
アダクトの断面図である。FIG. 3 is a sectional view of an air duct in which the composite parison shown in FIG. 1 is blow molded.
【図4】本発明に係る成形装置の一例を示す模式図であ
る。FIG. 4 is a schematic view showing an example of a molding apparatus according to the present invention.
【図5】パリソンの肉厚比率変更部の成形状態を示す説
明図である。FIG. 5 is an explanatory diagram showing a molding state of a parison thickness ratio changing portion.
1 軟質樹脂層 2 硬質樹脂層 3 剛性層 4 柔軟層 5 肉厚比率変更部 6 蛇腹部 7 連結部 8 形状保持部 9 境界面 11 ヘッド 12 マンドレル 13 第1樹脂供給路 14 第2樹脂供給路 15 内管部材 16 外管部材 17 ノズル 18 環状スリット 19 シリンダ 20 プランジャ 21 アキュムレータ式射出機 22 押出機 23 シリンダ 24 プランジャ 25 アキュムレータ式射出機 26 押出機 27 制御装置 28 位置検出センサ 29 位置検出センサ DESCRIPTION OF SYMBOLS 1 Soft resin layer 2 Hard resin layer 3 Rigid layer 4 Flexible layer 5 Thickness ratio change part 6 Bellows part 7 Connecting part 8 Shape holding part 9 Boundary surface 11 Head 12 Mandrel 13 First resin supply path 14 Second resin supply path 15 Inner pipe member 16 Outer pipe member 17 Nozzle 18 Annular slit 19 Cylinder 20 Plunger 21 Accumulator-type injection machine 22 Extruder 23 Cylinder 24 Plunger 25 Accumulator-type injection machine 26 Extruder 27 Control device 28 Position detection sensor 29 Position detection sensor
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) // B29L 9:00 23:00 (72)発明者 田中 伸英 大阪府豊中市新千里東町1丁目4番1号 タイガースポリマー株式会社内 Fターム(参考) 4F207 AH17 AR12 KA01 KA17 KB22 KF14 KK04 KK12 KK36 4F208 AH17 AR12 LA01 LA08 LB01 LD14 LG24 LG25 LG26 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) // B29L 9:00 23:00 (72) Inventor Nobuhide Tanaka 1-4-4 Shinsenri Higashicho, Toyonaka City, Osaka No.1 Tigers Polymer Co., Ltd. F term (reference) 4F207 AH17 AR12 KA01 KA17 KB22 KF14 KK04 KK12 KK36 4F208 AH17 AR12 LA01 LA08 LB01 LD14 LG24 LG25 LG26
Claims (2)
2種類の溶融樹脂を各々の樹脂供給路を通じて共通の押
出ヘッド内で合流させるとともに上記押出ヘッドの環状
スリットから押し出して単一のパリソンを成形する方法
であって、押出機から送り出された各溶融樹脂を各々の
アキュームレータ式射出機に一時的に貯えたうえ、それ
ぞれのプランジャを前進させて各溶融樹脂の各樹脂供給
路への押出量を調整する工程において、一方のプランジ
ャの前進とこれに対応する他方のプランジャのサックバ
ック動作の制御を行い、一方の溶融樹脂を樹脂供給路へ
の押し出すとともに他方の樹脂供給路に残存する溶融樹
脂を吸引することにより、押出ヘッドの環状スリットか
ら吐出されるパリソンの各樹脂層の肉厚比率を急激に変
更できるようにしたことを特徴とする複合パリソン成形
方法。At least two kinds of molten resins melted in separate extruders are merged in a common extrusion head through respective resin supply paths and extruded from an annular slit of the extrusion head to form a single parison. In this method, each molten resin sent from the extruder is temporarily stored in each accumulator-type injection machine, and then each plunger is advanced to determine the amount of each molten resin extruded into each resin supply path. In the adjusting step, the forward movement of one plunger and the corresponding suck-back operation of the other plunger are controlled, and one molten resin is pushed out to the resin supply path and the molten resin remaining in the other resin supply path is removed. By suction, the thickness ratio of each resin layer of the parison discharged from the annular slit of the extrusion head can be changed rapidly. A composite parison molding method, characterized in that:
する少なくとも2つの環状の樹脂供給路と、各樹脂供給
路に接続したアキュームレータ式射出機と、各アキュー
ムレータ式射出機に連結されそれぞれ異質の溶融樹脂を
供給する押出機とを備え、成形するパリソンの材質配分
に応じてアキュームレータ式射出機のプランジャ相互の
前進およびサックバック動作を制御する制御装置を設け
たことを特徴とする複合パリソン成形装置。2. An at least two annular resin supply path communicating with an annular slit provided in an extrusion head, an accumulator type injector connected to each resin supply path, and a different type of molten resin connected to each accumulator type injector. An extruder for supplying a resin, and a control device for controlling the mutual advance and suckback operation of the plungers of the accumulator-type injection machine in accordance with the material distribution of the parison to be molded.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10291600A JP2000117818A (en) | 1998-10-14 | 1998-10-14 | Method and apparatus for molding composite parison |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10291600A JP2000117818A (en) | 1998-10-14 | 1998-10-14 | Method and apparatus for molding composite parison |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000117818A true JP2000117818A (en) | 2000-04-25 |
Family
ID=17771053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10291600A Pending JP2000117818A (en) | 1998-10-14 | 1998-10-14 | Method and apparatus for molding composite parison |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000117818A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006011565A1 (en) * | 2004-07-28 | 2006-02-02 | Toyo Seikan Kaisha, Ltd. | Resin container, method for producing resin container, and apparatus for producing resin container |
WO2020177788A1 (en) * | 2019-03-07 | 2020-09-10 | Technische Universität Dortmund | Method and device for producing profiled cross-sections from metals and plastics by means of extrusion molding and extrusion |
-
1998
- 1998-10-14 JP JP10291600A patent/JP2000117818A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006011565A1 (en) * | 2004-07-28 | 2006-02-02 | Toyo Seikan Kaisha, Ltd. | Resin container, method for producing resin container, and apparatus for producing resin container |
JPWO2006011565A1 (en) * | 2004-07-28 | 2008-05-01 | 東洋製罐株式会社 | Resin container, resin container manufacturing method, and resin container manufacturing apparatus |
EP2186737A1 (en) * | 2004-07-28 | 2010-05-19 | Toyo Seikan Kaisya, Ltd. | Manufacturing method of a resin container and manufacturing apparatus of a resin container |
US7891963B2 (en) * | 2004-07-28 | 2011-02-22 | Toyo Seikan Kaisha Ltd. | Manufacturing apparatus of resin container |
JP2012035915A (en) * | 2004-07-28 | 2012-02-23 | Toyo Seikan Kaisha Ltd | Resin container, and manufacturing device of the resin container |
KR101280765B1 (en) * | 2004-07-28 | 2013-07-05 | 도요세이칸 그룹 홀딩스 가부시키가이샤 | Resin container, method for producing resin container, and apparatus for producing resin container |
WO2020177788A1 (en) * | 2019-03-07 | 2020-09-10 | Technische Universität Dortmund | Method and device for producing profiled cross-sections from metals and plastics by means of extrusion molding and extrusion |
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