JPH0232813A - Injection head for multi-layered parison molding - Google Patents
Injection head for multi-layered parison moldingInfo
- Publication number
- JPH0232813A JPH0232813A JP18257988A JP18257988A JPH0232813A JP H0232813 A JPH0232813 A JP H0232813A JP 18257988 A JP18257988 A JP 18257988A JP 18257988 A JP18257988 A JP 18257988A JP H0232813 A JPH0232813 A JP H0232813A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- cylindrical body
- injection head
- central nozzle
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002347 injection Methods 0.000 title claims abstract description 34
- 239000007924 injection Substances 0.000 title claims abstract description 34
- 238000000465 moulding Methods 0.000 title claims description 16
- 239000011347 resin Substances 0.000 claims abstract description 43
- 229920005989 resin Polymers 0.000 claims abstract description 43
- 230000004888 barrier function Effects 0.000 claims abstract description 19
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 19
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 19
- -1 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000002356 single layer Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000000071 blow moulding Methods 0.000 description 2
- 239000003925 fat Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1603—Multi-way nozzles specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
- B29C45/1646—Injecting parison-like articles
- B29C2045/1648—Injecting parison-like articles the parison core layer being a barrier material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/253—Preform
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は中央にバリヤー樹脂層を、その両側にポリエチ
レンテレフタレート系樹脂（以下ＰＥＴ樹脂という）層
を配した多層パリソンを製造する（従来の技術）
従来の多層パリソン成形用射出ヘッドは第３図に断面図
を示すように射出ヘッド１の中に筒状体２を挿入するこ
とにより、該筒状体２の中心をバリヤー樹脂を通す中央
ノズル３として、筒状体２と射出ヘッド１の間の空間を
ＰＥＴ樹脂を通すリングノズル４として、ＰＥＴｌｌＩ
４脂あるいはバリヤー樹脂の射出圧力を調整することに
より、多層パリソンの厚さ構成を調整するものであった
。Detailed Description of the Invention (Industrial Application Field) The present invention produces a multilayer parison having a barrier resin layer in the center and polyethylene terephthalate resin (hereinafter referred to as PET resin) layers on both sides (compared to the conventional technology). ) In the conventional injection head for molding a multilayer parison, a cylindrical body 2 is inserted into the injection head 1, as shown in the cross-sectional view in FIG. 3, the space between the cylindrical body 2 and the injection head 1 is used as a ring nozzle 4 through which PET resin passes.
By adjusting the injection pressure of 4 resin or barrier resin, the thickness structure of the multilayer parison was adjusted.
（発明が解決しようとする課題）
上記従来の多層パリソン成形用射出ヘッドは樹脂の射出
圧力で厚さを調整するものであるので精度よく調整する
のが困難であり、特に多層パリソンの底部を、ＰＥＴ樹
脂単層にすることが難しかった。このため、多層パリソ
ンから得られるボトルの底部にバリヤー樹脂層が残り、
落下衝撃等により剥離し易い欠点があった。(Problems to be Solved by the Invention) Since the above-mentioned conventional injection head for molding a multilayer parison adjusts the thickness by the injection pressure of the resin, it is difficult to accurately adjust the thickness. It was difficult to form a single layer of PET resin. This leaves a barrier resin layer at the bottom of the bottle obtained from the multilayer parison.
It has the disadvantage that it easily peels off due to impact from dropping.
本発明は中央ノズルのみを開閉するバルブビンを設ける
ことにより、精度の良い厚さ調整を可能にし、ＰＥＴ樹
脂単層部分の成形を可能にぜんとするものである。By providing a valve bin that opens and closes only the central nozzle, the present invention enables highly accurate thickness adjustment and completely enables molding of a single-layer PET resin portion.
（課題を解決するための手段）
本発明は上記課題を達成するためになされたものでその
要旨とするところは、射出ヘッドの内部に筒状体を挿入
し、該筒状体の中心をバリヤー樹脂を通ず中央ノズルと
し、前記筒状体と前記射出ヘッドとの間の空間をＰＥＴ
ｔＩＩｉ脂を通すリングノズルとした多層パリソン成形
用射出ヘッドにおいて、前記筒状体を、常にリングノズ
ルを解放する位置に保つとともに、中央ノズル内に中央
ノズルのみを開閉するバルブピンを備えた多層パリソン
成形用射出ヘッドである。(Means for Solving the Problems) The present invention has been made to achieve the above problems, and its gist is that a cylindrical body is inserted into the inside of an injection head, and the center of the cylindrical body is connected to a barrier. The resin is not passed through the central nozzle, and the space between the cylindrical body and the injection head is filled with PET.
In an injection head for multilayer parison molding having a ring nozzle through which tIIi fat passes, the cylindrical body is always kept in a position where the ring nozzle is released, and the central nozzle is equipped with a valve pin that opens and closes only the central nozzle. injection head.
［作用コ 以下図面を参照しながら説明する。[Action Co. This will be explained below with reference to the drawings.
第１図は本発明の多層パリソン成形用射出ヘッドの一例
を示す断面図、第２図は第１図の多層パリソン成形用射
出ヘッドにより製造したブロー成形用パリソンの断面図
、第３図は従来の多層パリソン成形用射出ヘッドの断面
図である。FIG. 1 is a sectional view showing an example of the injection head for multilayer parison molding of the present invention, FIG. 2 is a sectional view of a blow molding parison manufactured by the injection head for multilayer parison molding of FIG. 1, and FIG. 3 is a conventional one. FIG. 2 is a sectional view of an injection head for molding a multilayer parison.
第１図において１は射出ヘッドであり、側部のスプルー
１１からホットランナ−などを通じて射出シリンダー（
図示せず）からのＰＥＴ樹脂５が流入する。In Fig. 1, 1 is an injection head, and the injection cylinder (
PET resin 5 from (not shown) flows in.
２は筒状体であり、射出ヘッドとの間の空間はリングノ
ズル４が形成され、前記スプルー１１から流入したＰＥ
Ｔ樹脂５がこのリングノズル４内を通り先端から金型キ
ャビティ８内に吐出される。2 is a cylindrical body, and a ring nozzle 4 is formed in the space between it and the injection head, through which PE flowing from the sprue 11 is formed.
The T-resin 5 passes through the ring nozzle 4 and is discharged into the mold cavity 8 from the tip.
この筒状体２は、前進方向にはロックされており、常に
リングノズルを解放状態に保つのでＰＥＴ樹脂のみを安
定的に吐出してパリソンのＰＥＴ樹脂単層部分を成形す
ることができる。なお、この筒状体２はＰＥＴ樹脂の吐
出圧に応じてわずかに後退のみして、吐出量を大きくで
きるようにしてあってもよい。This cylindrical body 2 is locked in the forward direction and keeps the ring nozzle open at all times, so that only the PET resin can be stably discharged to form the PET resin single layer portion of the parison. Note that this cylindrical body 2 may be configured to move back only slightly depending on the discharge pressure of the PET resin, so that the discharge amount can be increased.
一方、筒状体２の中心の空間は中央ノズル３を形成し、
ホットランナ−等を通じて射出シリンダー（図示せず）
から射出されたバリヤー樹脂６が筒状体２の後方のスプ
ルー２１から流入して、中央ノズル３内を通り先端から
吐出される。バリヤー樹脂６は、ここでリングノズル４
の先端から吐出されたＰＥＴ！！（脂５の間に挾まれる
ように合流し多層化された状態で金型キャビティ８内に
吐出されるのである。On the other hand, the space at the center of the cylindrical body 2 forms a central nozzle 3,
Injection cylinder (not shown) through hot runner etc.
The barrier resin 6 injected from the cylindrical body 2 flows from the sprue 21 at the rear of the cylindrical body 2, passes through the central nozzle 3, and is discharged from the tip. The barrier resin 6 is applied to the ring nozzle 4 here.
PET discharged from the tip! ! (The mixture is sandwiched between the fats 5 and is discharged into the mold cavity 8 in a multilayered state.
７はバルブピンであり、中央ノズル内に設置され、この
バルブピン７を前進させると先端が中央ノズル３先端に
内側から係合してこれを開閉することにより、バリヤー
樹脂６の吐出量のみを調整し得るようになっている。バ
ルブピン７は中央ノズル３後端を貫通してホットランナ
−を抜けて、油圧シリンダー９等により前後に移動して
、確実にバリヤー樹脂６の吐出量を調整し得るようにな
っている。このバルブピン７先端がリングノズル４先端
まで延びるようにすると、ＰＥＴ樹脂が滞留し易くなる
ので好ましくない。A valve pin 7 is installed in the center nozzle, and when the valve pin 7 is advanced, its tip engages the tip of the center nozzle 3 from inside to open and close it, thereby adjusting only the discharge amount of the barrier resin 6. I'm starting to get it. The valve pin 7 passes through the rear end of the central nozzle 3 and passes through the hot runner, and is moved back and forth by a hydraulic cylinder 9 or the like to reliably adjust the discharge amount of the barrier resin 6. It is not preferable if the tip of the valve pin 7 extends to the tip of the ring nozzle 4 because the PET resin tends to stay there.
本発明の多層パリソン成形用射出ヘッドを用いて、多層
のブローボトル用パリソンを製造するためには、射出ヘ
ッド、筒状体、バルブピンからなる多層パリソン成形用
射出ヘッドをホットランナ−金型に組み込み、吐出口を
パリソン金型キャビティ８に接続し、ホットランナ−側
にＰＥＴ樹脂用およびバリヤー樹脂用の射出シリンダー
を接続する。そしてまずバルブピン７を前進させて中央
ノズル３を閉止させた状態で、解放状態のリングノズル
４からＰＥＴ樹脂５のみを吐出させて第２図に示すパリ
ソン口部８１の材料が金型キャビティ８に入り、続いて
バルブピン７を後退させて中央ノズル３を開き、バリヤ
ー樹脂６を吐出してパリソン胴部８２の多層材料を金型
キャビティ８内に吐出する。ｉ！に後に再びバルブピン
７を前進させて中央ノズル３のみを閉じ、パリソンの底
部８３のＰＥＴＩＪＪＩ単層の材料を金型キャビティ８
内に吐出する。こうして得られたブローボトル用パリソ
ンは第２図に示すように口部８１はＰＥＴ樹脂単層であ
るので高価なバリヤー樹脂の使用を少なくでき、胴部８
２は多層構成で十分なバリヤー性を有し、底部８３はＰ
ＥＴ樹脂単層であって多層化に伴う衝撃強度低下のおそ
れが小さいものである。In order to manufacture a multilayer parison for blow bottles using the injection head for molding a multilayer parison of the present invention, the injection head for molding a multilayer parison consisting of an injection head, a cylindrical body, and a valve pin is assembled into a hot runner mold. , the discharge port is connected to the parison mold cavity 8, and injection cylinders for PET resin and barrier resin are connected to the hot runner side. First, with the valve pin 7 advanced and the center nozzle 3 closed, only the PET resin 5 is discharged from the open ring nozzle 4, and the material of the parison opening 81 shown in FIG. Then, the valve pin 7 is retracted to open the central nozzle 3 and discharge the barrier resin 6 and the multilayer material of the parison body 82 into the mold cavity 8. i! Afterwards, the valve pin 7 is advanced again to close only the central nozzle 3, and the PETIJJI single layer material on the bottom part 83 of the parison is poured into the mold cavity 8.
Exhale inside. As shown in FIG. 2, the blow bottle parison thus obtained has a mouth part 81 made of a single layer of PET resin, so the use of expensive barrier resin can be reduced, and the body part 81 is made of a single layer of PET resin.
2 has a multilayer structure and has sufficient barrier properties, and the bottom part 83 is made of P.
Since it is a single layer of ET resin, there is little risk of a decrease in impact strength due to multilayering.
（発明の効果）
本発明は射出ヘッドの内部に筒状体を挿入し、該筒状体
の中心をバリヤー樹脂を通す中央ノズルとし、前記筒状
体と前記射出ヘッドとの間の空間をポリエチレンテレフ
タレート系樹脂を通すリングノズルとした多層パリソン
成形用射出ヘッドにおいて、前記筒状体を、常にリング
ノズルを解放する位置に保つとともに、中央ノズル内に
中央ノズルのみを開閉するバルブピンを備えた多層パリ
ソン成形用射出ヘッドであるので構造が簡単であるとと
もに、バリヤー樹脂屑のみの吐出量を制御するので多層
のパリソンの厚さ構成を精度よく自由に調整することが
でき、ＰＥＴ樹脂単層部分を安定的に成形することがで
き、さらに樹脂の滞留も少ない。(Effects of the Invention) The present invention inserts a cylindrical body inside an injection head, uses the center of the cylindrical body as a central nozzle through which barrier resin passes, and fills the space between the cylindrical body and the injection head with polyethylene. In an injection head for molding a multilayer parison with a ring nozzle for passing a terephthalate resin, the cylindrical body is always kept in a position where the ring nozzle is released, and the multilayer parison is equipped with a valve pin in the center nozzle that opens and closes only the center nozzle. Since it is an injection head for molding, it has a simple structure, and since it controls the amount of discharge of only barrier resin waste, the thickness structure of the multilayer parison can be adjusted freely and accurately, and the single layer PET resin part can be stabilized. It can be molded with ease, and there is little resin retention.
第１図は本発明の多層パリソン成形用射出ヘッドの一例
を示す断面図、第２図は第１図の多層パリソン成形用射
出ヘッドにより製造したブロー成形用パリソンの断面図
、第３図は従来の多層パリソン成形用射出ヘッドの断面
図である。
１・・・・・・射出ヘッド ２・・・・・・筒状
体３・・・・・・中央ノズル ４・・・・・・リン
グノズルラ・・・・・・ＰＥＴ樹脂 ６・・・・・
・バリヤー樹脂７・・・・・・バルブビン
」２品FIG. 1 is a sectional view showing an example of the injection head for multilayer parison molding of the present invention, FIG. 2 is a sectional view of a blow molding parison manufactured by the injection head for multilayer parison molding of FIG. 1, and FIG. 3 is a conventional one. FIG. 2 is a sectional view of an injection head for molding a multilayer parison. 1... Injection head 2... Cylindrical body 3... Center nozzle 4... Ring nozzle... PET resin 6...・・・
・Barrier resin 7... Valve bottle" 2 items
Claims (1)
バリヤー樹脂を通す中央ノズルとし、前記筒状体と前記
射出ヘッドとの間の空間をポリエチレンテレフタレート
系樹脂を通すリングノズルとした多層パリソン成形用射
出ヘッドにおいて、前記筒状体を、常にリングノズルを
解放する位置に保つとともに、中央ノズル内に中央ノズ
ルのみを開閉するバルブピンを備えた多層パリソン成形
用射出ヘッド。A cylindrical body is inserted into the interior of the injection head, the center of the cylindrical body is used as a central nozzle through which a barrier resin passes, and the space between the cylindrical body and the injection head is used as a ring nozzle through which a polyethylene terephthalate resin passes. An injection head for molding a multilayer parison, wherein the cylindrical body is always kept in a position where the ring nozzle is released, and a valve pin is provided in the center nozzle to open and close only the center nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18257988A JPH0232813A (en) | 1988-07-21 | 1988-07-21 | Injection head for multi-layered parison molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18257988A JPH0232813A (en) | 1988-07-21 | 1988-07-21 | Injection head for multi-layered parison molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0232813A true JPH0232813A (en) | 1990-02-02 |
Family
ID=16120753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18257988A Pending JPH0232813A (en) | 1988-07-21 | 1988-07-21 | Injection head for multi-layered parison molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0232813A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999022926A1 (en) * | 1997-11-04 | 1999-05-14 | Otto Hofstetter Ag Werkzeug- Und Formenbau | Method for producing multi-layered preforms |
| WO2002032650A1 (en) * | 2000-10-19 | 2002-04-25 | Teijin Limited | Multi-layer preliminary formed body and method of manufacturing the formed body |
| WO2006107099A1 (en) * | 2005-04-01 | 2006-10-12 | Kureha Corporation | Multilayer blow-molded container and method for producing same |
-
1988
- 1988-07-21 JP JP18257988A patent/JPH0232813A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999022926A1 (en) * | 1997-11-04 | 1999-05-14 | Otto Hofstetter Ag Werkzeug- Und Formenbau | Method for producing multi-layered preforms |
| JP2001521837A (en) * | 1997-11-04 | 2001-11-13 | オットー ホフシュテッテル アクチェン ゲゼルシャフト ベルクゾイグ−ウント フォルメンバウ | Method for producing multilayer preform |
| WO2002032650A1 (en) * | 2000-10-19 | 2002-04-25 | Teijin Limited | Multi-layer preliminary formed body and method of manufacturing the formed body |
| US7344673B2 (en) | 2000-10-19 | 2008-03-18 | Teijin Limited | Multi-layer preliminary formed body and method of manufacturing the formed body |
| WO2006107099A1 (en) * | 2005-04-01 | 2006-10-12 | Kureha Corporation | Multilayer blow-molded container and method for producing same |
| JPWO2006107099A1 (en) * | 2005-04-01 | 2008-10-02 | 株式会社クレハ | Multilayer blow molded container and method for producing the same |
| US7976919B2 (en) | 2005-04-01 | 2011-07-12 | Kureha Corporation | Multilayer blow molded container and production process thereof |
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