JPH08210564A - Blow molding method of plastic conduit and device thereof - Google Patents
Blow molding method of plastic conduit and device thereofInfo
- Publication number
- JPH08210564A JPH08210564A JP5311081A JP31108193A JPH08210564A JP H08210564 A JPH08210564 A JP H08210564A JP 5311081 A JP5311081 A JP 5311081A JP 31108193 A JP31108193 A JP 31108193A JP H08210564 A JPH08210564 A JP H08210564A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- resin
- blow molding
- parison
- accumulator
- 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.)
- Granted
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、合成樹脂管のブロー
成形方法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding method and apparatus for a synthetic resin pipe.
【０００２】[0002]
【従来の技術】この種の合成樹脂管としては、実公昭６
０−２７２７０号公報に記載された剛性薄肉プラスチッ
ク管がある。2. Description of the Related Art As a synthetic resin pipe of this type, Jitsuko Sho
There is a rigid thin-walled plastic tube described in 0-27270.
【０００３】[0003]
【発明が解決しようとする課題】前記従来の合成樹脂管
においては、単一のパリソンは単一のポリエチレン、ポ
リプロピレンなどの熱可塑性樹脂からなり、その屈曲部
も同一材質で成形されているため、この屈曲部の湾曲変
形度は今一度の感がある。この発明は、前記欠点を有さ
ない単一パリソンから少なくとも一箇所屈曲部を有する
合成樹脂管をブロー成形する方法及びその装置を市場に
提供することを目的とする。In the above-mentioned conventional synthetic resin pipe, since the single parison is made of a single thermoplastic resin such as polyethylene or polypropylene, and its bent portion is also formed of the same material, The bending deformation degree of this bent portion has a feeling once again. It is an object of the present invention to provide on the market a method and an apparatus for blow molding a synthetic resin pipe having at least one bent portion from a single parison that does not have the above-mentioned drawbacks.
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するため
に、この特定発明は少なくとも２台の押出機をダイ外ア
キュームレータ式射出機を介して共通の吹き込み成形ダ
イに接続し、前記２台の押出し機のうち一方に、軟質合
成樹脂を、他方に硬質合成樹脂を各々供給し、各押出機
のスクリュー回転数を駆動制御し、押出機内で溶融され
た各溶融樹脂を対応する前記アキュームレータ式射出機
のアキュームレータ室へ各々押出し、ここに一時滞留し
ておき、前記２種の合成樹脂の厚さ比率に応じて前記各
アキュームレータ式射出機の射出用プランジャを前記吹
き込み成形ダイに向け前進送り制御し、各合成樹脂を吹
き込み成形ダイ内の対応する各樹脂供給路内へ供給し、
前記パリソン吐出口より押出し、軟質合成樹脂の厚さ比
率の高い合成樹脂相当管の屈曲部分に相応する所定寸法
のパリソンをこの吹き込み成形ダイから押し出し、次
に、硬質合成樹脂の厚さ比率の高い合成樹脂管の部分に
相応するパリソンを押し出す場合には、軟質合成樹脂を
供給する側のダイ外アキュームレータ式射出機の射出用
プランジャを、前記アキュームレータ式射出機の樹脂押
出量に対応させながら後退させると共に、対応する押出
機のスクリュー回転を低速とし、この吹き込み成形ダイ
内にある軟質合成樹脂の残留応力をこのアキュームレー
タ室で吸収し吹き込み成形ダイの前記吐出口からの押出
しを少量とすると共に、硬質合成樹脂を対応プランジャ
の前進により吹き込み成形ダイの対応する硬質合成樹脂
供給路内へ前回より多量に供給して、その吐出口より押
出し、合成樹脂管の硬質合成樹脂の厚さ比率の高い部分
に相応する所定寸法のパリソンをこの吹き込み成形ダイ
から前記パリソンに引き続いて一体に押し出し、このよ
うに成形した異質の樹脂からなる単一のパリソンを成形
型内に収納後、ブロー成形して少なくとも一箇所屈曲部
を有する合成樹脂管をブロー成形することを特徴とする
合成樹脂管のブロー成形方法としてある。In order to solve the above-mentioned problems, this specific invention connects at least two extruders to a common blow molding die via an out-die accumulator type injection machine, The soft synthetic resin is supplied to one of the extruders and the hard synthetic resin is supplied to the other, and the screw rotation speed of each extruder is drive-controlled, and each molten resin melted in the extruder corresponds to the accumulator type injection. Each of them is extruded into the accumulator chamber of the machine and temporarily retained therein, and forward feed control of the injection plunger of each accumulator type injection machine is directed toward the blow molding die according to the thickness ratio of the two kinds of synthetic resin. , Each synthetic resin is supplied into each corresponding resin supply path in the blow molding die,
A parison having a predetermined size, which is extruded from the parison discharge port and corresponds to a bent portion of a synthetic resin equivalent pipe having a high thickness ratio of a soft synthetic resin, is extruded from the blow molding die, and then a thickness ratio of the hard synthetic resin is high. When pushing out the parison corresponding to the synthetic resin pipe part, the injection plunger of the accumulator type injection machine outside the die on the side supplying the soft synthetic resin is moved backward while corresponding to the resin extrusion amount of the accumulator type injection machine. Along with, the screw rotation of the corresponding extruder is slowed down, the residual stress of the soft synthetic resin in the blow molding die is absorbed in this accumulator chamber, and the extrusion from the discharge port of the blow molding die is made small, and the hard Blowing synthetic resin into the corresponding hard synthetic resin supply channel of the molding die by advancing the corresponding plunger from the previous time The amount of the parison is extruded from the discharge port, and a parison of a predetermined size corresponding to a portion of the synthetic resin pipe having a high thickness ratio of the hard synthetic resin is extruded integrally from the blow molding die following the parison. A blow molding method for a synthetic resin pipe, characterized in that after a single parison made of a heterogeneous resin molded in the above is housed in a molding die, blow molding is performed to blow mold a synthetic resin pipe having at least one bent portion. There is.
【０００５】前記課題を解決するため、関連発明は、吹
き込み成形ダイに設けた単一のパリソン吐出口に連通す
る少なくとも２重の樹脂供給路が前記成形ダイ内に設け
てあり、前記２重の樹脂供給路のうち、一方の樹脂供給
路は軟質合成樹脂用としてあり、他方の樹脂供給路は硬
質合成樹脂用としてあり、各樹脂供給路には其れ其れダ
イ外アキュームレータ式射出機が接続してあり、前記各
アキュームレータ式射出機に対応する溶融樹脂を送り込
む押出機が連結されていると共に、この２種の樹脂の吐
出量を調整するべく前記各押出機のスクリュー回転数及
びダイ外アキュームレータ式射出機の滞留量を制御する
制御部が設けてある事を特徴とする合成樹脂管のブロー
成形装置としてある。In order to solve the above-mentioned problems, in the related invention, at least a double resin supply passage communicating with a single parison discharge port provided in a blow molding die is provided in the molding die, and the double resin supply passage is provided. Of the resin supply paths, one resin supply path is for soft synthetic resin, the other resin supply path is for hard synthetic resin, and each resin supply path is connected to an accumulator type injection machine outside the die. An extruder for feeding the molten resin corresponding to each accumulator type injection machine is connected, and the screw rotation speed of each extruder and the accumulator outside the die are adjusted in order to adjust the discharge amount of these two types of resin. A blow molding device for a synthetic resin pipe is characterized in that a control unit for controlling the amount of stay of the injection machine is provided.
【０００６】[0006]
【作用】請求項２に記載された装置発明の作用を請求項
１記載の方法発明と関連して次に説明する。前記２台の
押出機のうち、一方の押出機には硬質樹脂（例、ＨＤＰ
Ｅ樹脂）を、他方の押出機には軟質樹脂（例、ＬＤＰＥ
樹脂）を各々供給し、各押出機のスクリュー回転数を前
記制御部により駆動制御し、押出機内で溶融された各溶
融樹脂を対応する前記アキュームレータ式射出機のアキ
ュームレータ室へ各々押出し、ここに一時滞留してお
き、前記各アキュームレータ式射出用プランジャを前記
吹き込み成形ダイに向けサーボ制御方式で前進送り制御
し、溶融樹脂を吹き込み成形ダイ内の対応する各樹脂供
給路内へ供給し、前記パリソン吐出口より押出し、軟質
樹脂の厚さ比率の高い合成樹脂管の屈曲部に相応する所
定寸法のパリソンをこの吹き込み成形ダイから押し出
す。The operation of the apparatus invention described in claim 2 will be described below in connection with the method invention described in claim 1. One of the two extruders has a hard resin (eg HDP
E resin) and soft resin (eg LDPE) for the other extruder
Resin), and the screw rotation speed of each extruder is drive-controlled by the control unit, and each molten resin melted in the extruder is extruded into the corresponding accumulator chamber of the accumulator-type injection machine, where it is temporarily The accumulator-type injection plungers are retained, and forward feed control is performed by a servo control method toward the blow molding die to supply molten resin into the corresponding resin supply paths in the blow molding die to discharge the parison. A parison having a predetermined size corresponding to the bent portion of the synthetic resin pipe having a high thickness ratio of the soft resin is extruded from the outlet and extruded from the blow molding die.
【０００７】次に、硬質合成樹脂の厚さ比率の高い合成
樹脂管の部分に相応するパリソンを押し出す場合には、
軟質樹脂を供給する側のダイ外アキュームレータ式射出
機の射出機の射出用プランジャを、前記アキュームレー
タ式の射出機の樹脂押出量に対応させながら進退させる
と共に、対応する押出し機のスクリュー回転を低速とし
この吹き込み成形ダイ内にある軟質合成樹脂の残留応力
をこのアキュームレータ室で吸収し吹き込み成形ダイの
前記吐出口からの押出しを少量とする。また、硬質合成
樹脂は対応するプランジヤの前進により吹き込み成形ダ
イの対応する硬質合成樹脂供給路内へ前回より多量に供
給され、その吐出口より押出し、合成時油脂管の硬質合
成樹脂の厚さ比率の高い部分に相応する所定寸法のパリ
ソンをこの吹き込み成形ダイから前記パリソンに引き続
いて一体に押し出す。このように成形した異質の樹脂か
らなる単一のパリソンＰを成形型内に収納後、ブロー成
形して少なくとも一箇所屈曲部を有する合成樹脂管を成
形する。Next, in the case of extruding a parison corresponding to a portion of a synthetic resin pipe having a high thickness ratio of hard synthetic resin,
The injection plunger of the injector of the accumulator-type injection machine outside the die that supplies the soft resin is advanced and retracted while corresponding to the resin extrusion amount of the accumulator-type injection machine, and the screw rotation of the corresponding extruder is made low speed. The residual stress of the soft synthetic resin in the blow molding die is absorbed in the accumulator chamber, and the extrusion from the discharge port of the blow molding die is made small. In addition, the hard synthetic resin is supplied in a larger amount than the previous time into the corresponding hard synthetic resin supply path of the blow molding die by the advance of the corresponding plunger, and is extruded from the discharge port, and the thickness ratio of the hard synthetic resin of the oil and fat pipe during synthesis is increased. A parison of a predetermined size corresponding to the higher part of the parison is extruded integrally from this blow molding die following the parison. A single parison P made of a different resin thus molded is housed in a molding die and then blow molded to mold a synthetic resin pipe having at least one bent portion.
【０００８】[0008]
【実施例】次に、請求項２記載の装置発明の代表的な実
施例を説明する。図１において、Ａはブロー成形装置全
体を示し、その吹き込み成形ダイ１０には、単一のパリ
ソン吐出口１１が公知のもの同様に設けてあり、このパ
リソン吐出口１１に連通する２重の樹脂供給路１２、１
３が前記成形ダイ１０内に設けてある。更に、前記各樹
脂供給路１２、１３には其れ其れダイ外アキュームレー
タ式射出機１４、１５が接続してあり、前記各アキュー
ムレータ式射出機１４、１５の樹脂アキュームレータ室
１６、１７へ溶融樹脂を送り込む押出機１８、１９が、
各アキュームレータ式射出機１４、１５に連結されてい
る。前記２種の樹脂の吐出量を調整すべく前記各押出機
１８、１９のスクリュー回転及びアキュームレータ式射
出機１４、１５の滞留量を制御する制御部（図示せず）
が設けてある。このように構成したブロー成形装置Ａに
より、合成樹脂管の一種である図２に示す柔軟な蛇腹部
Ｊを中間部に、その一端部に螺条溝Ｒ付きのジョイント
部Ｔを有する自動車用空調ダクト管Ｂを製造するには、
前記樹脂供給路１２、１３のうち一方の樹脂供給路１２
は、前記蛇腹部Ｊ成形に主に使用する軟質合成樹脂（例
えば、ＬＤＰＥ樹脂）用とし、他の樹脂供給路１３は、
硬質合成樹脂（例えばＨＤＰＥ樹脂）用として使用す
る。前記押出機１８、１９の押出スクリュ２０、２１へ
対応する合成樹脂を供給し、溶融して軟室合成樹脂を一
方の樹脂供給路１２側のダイ外アキュームレータ式射出
機１４の樹脂アキュームレータ室１６内へ所定量押出
し、一時滞留させ、そのプランジャ２２を後退位置に維
持する。EXAMPLES Next, typical examples of the apparatus invention according to claim 2 will be described. In FIG. 1, A indicates the entire blow molding device, and a blow molding die 10 is provided with a single parison discharge port 11 similarly to a known one, and a double resin communicating with the parison discharge port 11 is provided. Supply path 12, 1
3 is provided in the molding die 10. Further, outside the die accumulator type injection machines 14 and 15 are connected to the resin supply paths 12 and 13, respectively, and the molten resin is fed to the resin accumulator chambers 16 and 17 of the accumulator type injection machines 14 and 15. Extruders 18 and 19 for feeding
It is connected to each accumulator type injection machine 14, 15. A control unit (not shown) that controls the screw rotation of each of the extruders 18 and 19 and the retention amount of the accumulator-type injectors 14 and 15 in order to adjust the discharge amounts of the two types of resins.
Is provided. With the blow molding apparatus A configured in this way, an air conditioner for automobiles having a flexible bellows portion J shown in FIG. 2 which is a kind of synthetic resin pipe in the middle portion and a joint portion T with a thread groove R at one end portion thereof To manufacture the duct tube B,
One of the resin supply passages 12 and 13
Is for a soft synthetic resin (for example, LDPE resin) mainly used for the bellows portion J molding, and the other resin supply passage 13 is
Used as a hard synthetic resin (for example, HDPE resin). The corresponding synthetic resin is supplied to the extrusion screws 20 and 21 of the extruders 18 and 19, and the soft chamber synthetic resin is melted and the synthetic resin inside the resin accumulator chamber 16 of the outside die accumulator type injection machine 14 on one resin supply path 12 side. A predetermined amount is extruded to and temporarily retained, and the plunger 22 is maintained in the retracted position.
【０００９】一方、他の樹脂供給路１３側のダイ外アキ
ュムレータ式射出機１５の樹脂アキュームレータ室１７
内へ溶融した硬質合成樹脂を押出し、所帯量滞留させ
る。次いでプランジャ２２、２３を制御部で駆動制御
し、前記成形ダイ１０に向け所定寸法前進送りし、この
樹脂アキュームレータ室１６、１７内の溶融状態の軟質
合成樹脂Ｆ及び硬質合成樹脂Ｇを前記樹脂供給路１２、
１３を通りパリソン吐出口１１より押出し、製造すべき
前記ダクト管Ｂの硬質合成樹脂Ｇの厚さ比率の高い部分
に相応する所定寸法のパリソンＰ1 を、この成形ダイ１
１から押出す。この際、この２層のパリソンＰ1におい
て、硬質合成樹脂Ｇの層は軟質合成樹脂Ｆの層より厚く
なる。On the other hand, the resin accumulator chamber 17 of the outside die accumulator type injection machine 15 on the side of the other resin supply passage 13
The hard synthetic resin melted inside is extruded, and the desired amount is retained. Then, the plungers 22 and 23 are driven and controlled by a control unit, and the plungers 22 and 23 are advanced and fed to the molding die 10 by a predetermined size, and the soft synthetic resin F and the hard synthetic resin G in a molten state in the resin accumulator chambers 16 and 17 are supplied to the resin. Road 12,
A parison P 1 having a predetermined size corresponding to a portion of the duct pipe B having a high thickness ratio of the hard synthetic resin G to be manufactured by being extruded from the parison discharge port 11 through the molding die 1
Extrude from 1. At this time, in the two-layer parison P 1 , the hard synthetic resin G layer is thicker than the soft synthetic resin F layer.
【００１０】次に、前記柔軟な蛇腹部Ｊ及びジョイント
部Ｔを成形するに際しては、前記プランジャ２３を後退
させると共に、対応する押出し機１９のスクリュー２１
の回転を低速とし、前記押出機１９から押し出されてく
る溶融状態の硬質合成樹脂Ｇを所定量一時的に樹脂アキ
ュームレータ室１７内に滞留させる。前記プランジャ２
２の前進寸法を大きくし、前記樹脂供給路１２を経て前
記パリソン吐出口１１から前記樹脂アキュームレータ室
１６内の溶融した軟質合成樹脂Ｆを前回より多量に押出
し、前記蛇腹部Ｊ及びジョイント部Ｔに相応する所定寸
法のパリソンＰ2 を前記パリソンＰ1 に連なり一体とし
て前記パリソン吐出口１１より押出し成形する。この
際、この２層のパリソンＰ2において、軟質合成樹脂Ｆ
の層は硬質合成樹脂Ｇの層より厚くなる（図３参照）。
前記のような操作を繰返し行い、硬質合成樹脂Ｇの厚さ
比率の高いパリソンＰ1と軟質合成樹脂Ｆの厚さ比率の
高いパリソンＰ2を連ねてなる２層のパリソンＰを、真
下に配置した成形金型（図示せず）内に載置し型締めし
た後、この成形ダイ１１から通常通りパリソンＰ内に空
気を吹き込み、蛇腹部Ｊ、ジョイント部Ｔが軟質合成樹
脂Ｆの層を厚くし、その、他の部分は硬質合成樹脂Ｇの
層を厚くしてなる前記ダクト管Ｂをブロー成形する。ま
た、２種に限らずその樹脂供給路、それに対応するダイ
外アキュームレータ式射出機及び押出機を増設し、３種
類以上からなる合成樹脂管を成形する（図４参照）よう
にしてもこの方法発明及び装置発明としては同一であ
る。Next, when molding the flexible bellows portion J and the joint portion T, the plunger 23 is retracted and the corresponding screw 21 of the extruder 19 is formed.
Is rotated at a low speed, and a predetermined amount of the hard synthetic resin G in a molten state extruded from the extruder 19 is temporarily retained in the resin accumulator chamber 17. Plunger 2
2 is increased, and the molten soft synthetic resin F in the resin accumulator chamber 16 is extruded from the parison discharge port 11 through the resin supply passage 12 in a larger amount than the previous time, and then is pushed to the bellows portion J and the joint portion T. A parison P 2 having a corresponding predetermined size is continuous with the parison P 1 and is integrally formed by extrusion from the parison discharge port 11. At this time, in the two-layer parison P 2 , the soft synthetic resin F
Is thicker than the hard synthetic resin G layer (see FIG. 3).
By repeating the above-mentioned operation, a two-layer parison P, which is formed by connecting the parison P 1 having a high thickness ratio of the hard synthetic resin G and the parison P 2 having a high thickness ratio of the soft synthetic resin F, is arranged directly below. After being placed in a molding die (not shown) and clamped, air is blown into the parison P from the molding die 11 as usual, and the bellows portion J and the joint portion T thicken the layer of the soft synthetic resin F. The other portion of the duct tube B is made by blow molding the thick synthetic resin G layer. Further, the method is not limited to two types, but a resin supply path, accumulator-type outside-die injectors and extruders corresponding thereto are added, and a synthetic resin pipe made of three or more types is molded (see FIG. 4). The invention and the device invention are the same.
【００１１】実験例 次に、樹脂の組合せは次の通りである。 Experimental Example Next, the combination of resins is as follows.
【００１２】[0012]
【発明の効果】請求項１記載の特定発明においては、共
通の吹き込み成形ダイにダイ外アキュームレータ式射出
機を介して、少なくとも２台の押出機を接続し、各押出
機に供給した軟質合成樹脂と硬質合成樹脂をその流量比
を変えて、前記吹き込み成形ダイに供給することで、多
層パリソンにおいて、硬質合成樹脂と硬質合成樹脂の肉
厚比を随意に変更することができると共に、多層パリソ
ンのこれら樹脂の肉厚比を徐々になだらかに変更するこ
とができ、かつ、パリソン全長にわたりパリソンを少な
くともこれら２種の樹脂で成形することができ、前記屈
曲部における柔軟度を充分に確保できる。組立て時に合
成樹脂製管両端の位置を大きく三次元的に芯ずれさせて
組立て、配管する必要がある場合であっても屈曲部が他
の部分より曲がり易く、充分に湾曲した状態で取付け、
配管が容易な合成樹脂製管を成形できる。請求項２記載
の関連発明である成形装置においては、前記成形方法を
実施でき、かつ、異種の樹脂の肉厚比を滑らかに変更で
きる。更に、柔軟な屈曲部付きの合成樹脂管を簡易に成
形することができる。According to the specific invention of claim 1, at least two extruders are connected to a common blow molding die via an accumulator type injection machine outside the die, and a soft synthetic resin supplied to each extruder. By changing the flow rate ratio of the hard synthetic resin and the hard synthetic resin to the blow molding die, it is possible to arbitrarily change the thickness ratio of the hard synthetic resin and the hard synthetic resin in the multi-layer parison. The wall thickness ratio of these resins can be gradually changed, and the parison can be molded with at least these two kinds of resins over the entire length of the parison, so that the flexibility at the bent portion can be sufficiently ensured. Even when it is necessary to assemble the pipes with the ends of the synthetic resin pipe largely offset in three dimensions during assembly, the bent portion is easier to bend than other parts, and the pipe is mounted in a sufficiently curved state.
It is possible to mold synthetic resin pipes that are easy to pipe. In the molding apparatus according to the second aspect of the present invention, the molding method can be performed, and the wall thickness ratios of different resins can be smoothly changed. Furthermore, a synthetic resin pipe with a flexible bent portion can be easily molded.
【図１】この製造装置の実施例を示す概略図である。FIG. 1 is a schematic view showing an embodiment of this manufacturing apparatus.
【図２】その成形品の一例を示す斜視図である。FIG. 2 is a perspective view showing an example of the molded product.
【図３】図２の断面図である。3 is a cross-sectional view of FIG.
【図４】その他の成形品の断面図である。FIG. 4 is a cross-sectional view of another molded product.
１４、１５ ダイ外アキュームレータ式射出機 14, 15 Outside die accumulator type injection machine
Claims (2)
ムレータ式射出機を介して共通の吹き込み成形ダイに接
続し、前記２台の押出し機のうち一方に、軟質合成樹脂
を、他方に硬質合成樹脂を各々供給し、各押出機のスク
リュー回転数を駆動制御し、押出機内で溶融された各溶
融樹脂を対応する前記アキュームレータ式射出機のアキ
ュームレータ室へ各々押出し、ここに一時滞留してお
き、前記２種の合成樹脂の厚さ比率に応じて前記各アキ
ュームレータ式射出機の射出用プランジャを前記吹き込
み成形ダイに向け前進送り制御し、各合成樹脂を吹き込
み成形ダイ内の対応する各樹脂供給路内へ供給し、前記
パリソン吐出口より押出し、軟質合成樹脂の厚さ比率の
高い合成樹脂相当管の屈曲部に相応する所定寸法のパリ
ソンをこの吹き込み成形ダイから押し出し、 次に、硬質合成樹脂の厚さ比率の高い合成樹脂管の部分
に相応するパリソンを押し出す場合には、軟質合成樹脂
を供給する側のダイ外アキュームレータ式射出機の射出
用プランジャを、前記アキュームレータ式射出機の樹脂
押出量に対応させながら後退させると共に、対応する押
出機のスクリュー回転を低速とし、この吹き込み成形ダ
イ内にある軟質合成樹脂の残留応力をこのアキュームレ
ータ室で吸収し吹き込み成形ダイの前記吐出口からの押
出しを少量とすると共に、硬質合成樹脂を対応プランジ
ャの前進により吹き込み成形ダイの対応する硬質合成樹
脂供給路内へ前回より多量に供給して、その吐出口より
押出し、合成樹脂管の硬質合成樹脂の厚さ比率の高い部
分に相応する所定寸法のパリソンをこの吹き込み成形ダ
イから前記パリソンに引き続いて一体に押し出し、この
ように成形した異質の樹脂からなる単一のパリソンを成
形型内に収納後、ブロー成形して少なくとも一箇所屈曲
部を有する合成樹脂管をブロー成形することを特徴とす
る合成樹脂管のブロー成形方法。1. At least two extruders are connected to a common blow molding die via an accumulator type injection machine outside the die, and one of the two extruders is made of a soft synthetic resin and the other is made of a hard synthetic resin. Each resin is supplied, the screw rotation speed of each extruder is controlled, each molten resin melted in the extruder is extruded into the accumulator chamber of the corresponding accumulator-type injection machine, and temporarily retained therein, The injection plunger of each accumulator-type injection machine is controlled to move forward toward the blow molding die according to the thickness ratio of the two types of synthetic resin, and each synthetic resin is supplied to the corresponding resin supply path in the blow molding die. It is supplied into the interior of the parison and extruded from the parison discharge port. When pushing out the parison corresponding to the portion of the synthetic resin tube with a high thickness ratio of the hard synthetic resin, extrude from the die and press the injection plunger of the accumulator-type injection machine outside the die on the side that supplies the soft synthetic resin. While retracting while corresponding to the resin extrusion amount of the accumulator type injection machine, the screw rotation of the corresponding extruder is set to a low speed, and the residual stress of the soft synthetic resin in the blow molding die is absorbed in this accumulator chamber. A small amount of extrusion from the discharge port of the blow molding die is used, and a large amount of hard synthetic resin is supplied into the corresponding hard synthetic resin supply path of the blow molding die by the advance of the corresponding plunger, and from that discharge port. Extrude and blow a parison of the specified size corresponding to the portion of the synthetic resin tube where the thickness ratio of the hard synthetic resin is high. After the parison is extruded integrally from the shaping die, the single parison made of different resin molded in this way is stored in the molding die, and blow molding is performed to blow a synthetic resin pipe having at least one bent portion. A blow molding method for a synthetic resin pipe, which comprises molding.
吐出口に連通する少なくとも２重の樹脂供給路が前記成
形ダイ内に設けてあり、前記２重の樹脂供給路のうち、
一方の樹脂供給路は軟質合成樹脂用としてあり、他方の
樹脂供給路は硬質合成樹脂用としてあり、各樹脂供給路
には其れ其れダイ外アキュームレータ式射出機が接続し
てあり、前記各アキュームレータ式射出機に対応する溶
融樹脂を送り込む押出機が連結されていると共に、この
２種の樹脂の吐出量を調整するべく前記各押出機のスク
リュー回転数及びダイ外アキユームレータ式射出機の滞
留量を制御する制御部が設けてある事を特徴とする合成
樹脂管のブロー成形装置。2. At least a double resin supply passage communicating with a single parison discharge port provided in a blow molding die is provided in the molding die, and among the double resin supply passages,
One resin supply path is for soft synthetic resin, the other resin supply path is for hard synthetic resin, and each resin supply path is connected to an accumulator type injection machine outside the die, An extruder for feeding the molten resin corresponding to the accumulator type injection machine is connected, and the screw rotation speed of each of the extruders and the die outside accumulator type injection machine are adjusted in order to adjust the discharge amount of these two types of resin. A blow molding device for synthetic resin pipes, characterized in that a control unit for controlling the amount of stay is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5311081A JP2791934B2 (en) | 1993-11-18 | 1993-11-18 | Blow molding method of synthetic resin automotive air conditioning duct tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5311081A JP2791934B2 (en) | 1993-11-18 | 1993-11-18 | Blow molding method of synthetic resin automotive air conditioning duct tube |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9035719A Division JP2782185B2 (en) | 1997-02-05 | 1997-02-05 | Blow molding equipment for synthetic resin automotive air-conditioning duct tubes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08210564A true JPH08210564A (en) | 1996-08-20 |
| JP2791934B2 JP2791934B2 (en) | 1998-08-27 |
Family
ID=18012898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5311081A Expired - Fee Related JP2791934B2 (en) | 1993-11-18 | 1993-11-18 | Blow molding method of synthetic resin automotive air conditioning duct tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2791934B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5501945A (en) * | 1994-08-30 | 1996-03-26 | The University Of Akron | Method of using multichromic polymers in packaging |
| US6056018A (en) * | 1997-10-29 | 2000-05-02 | E.I. Du Pont De Nemours And Company | Variable stiffness bellows |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5727830A (en) * | 1980-07-21 | 1982-02-15 | Kawasaki Heavy Ind Ltd | Air-tight discharge device of powdery granule |
-
1993
- 1993-11-18 JP JP5311081A patent/JP2791934B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5727830A (en) * | 1980-07-21 | 1982-02-15 | Kawasaki Heavy Ind Ltd | Air-tight discharge device of powdery granule |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5501945A (en) * | 1994-08-30 | 1996-03-26 | The University Of Akron | Method of using multichromic polymers in packaging |
| US6056018A (en) * | 1997-10-29 | 2000-05-02 | E.I. Du Pont De Nemours And Company | Variable stiffness bellows |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2791934B2 (en) | 1998-08-27 |
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