JP3595384B2 - Two-color injection molding nozzle of injection molding machine - Google Patents

Two-color injection molding nozzle of injection molding machine Download PDF

Info

Publication number
JP3595384B2
JP3595384B2 JP20324795A JP20324795A JP3595384B2 JP 3595384 B2 JP3595384 B2 JP 3595384B2 JP 20324795 A JP20324795 A JP 20324795A JP 20324795 A JP20324795 A JP 20324795A JP 3595384 B2 JP3595384 B2 JP 3595384B2
Authority
JP
Japan
Prior art keywords
nozzle
resin
injection molding
inner cylinder
cylinder nozzle
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.)
Expired - Fee Related
Application number
JP20324795A
Other languages
Japanese (ja)
Other versions
JPH0948043A (en
Inventor
哲 若井
俊彦 苅谷
秀雄 米谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP20324795A priority Critical patent/JP3595384B2/en
Publication of JPH0948043A publication Critical patent/JPH0948043A/en
Application granted granted Critical
Publication of JP3595384B2 publication Critical patent/JP3595384B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
    • B29C2045/308—Mixing or stirring devices

Description

【０００１】
【発明の属する技術分野】
本発明は射出成形機に用いられる二色（サンドイッチ）射出成形用ノズルに関するものである。
【０００２】
【従来の技術】
従来の射出成形機において二色成形を得る方法として、異なる二色の樹脂原料をそれぞれ別個の加熱シリンダで可塑化溶融し、これを一個の射出ノズルの手前において切換バルブを介するか、または介することなく合流する如く通路を連結した装置が種々提供されているが、その一例を図３〜図５によって説明する。
【０００３】
図３において、第一射出ユニット“Ａ”，第二射出ユニット“Ｂ”は、それぞれ異なった樹脂原料を可塑化溶融して射出可能な構成であり、第一射出ユニット“Ａ”の加熱シリンダ１１の先端は連結管１２を介して、外筒ノズル９の供給口１０と連結されている。
【０００４】
第二射出ユニット“Ｂ”の加熱シリンダ７の先端には、ニードル開閉形式に構成した内筒ノズル８が装着されており、その内筒ノズル８は、これと同心的に設けられた外筒ノズル９内に摺動自在に嵌装され、それらの間に樹脂通路１７が形成されている。
【０００５】
外筒ノズル９の先端射出口１８の内方に弁座１９を設け、内筒ノズル８の先端部で樹脂通路１７を遮断する弁機構を構成させてある。
内筒ノズル８は種々公知の型式であるニードル開閉ノズル構造で、第一樹脂２５，第二樹脂２６の射出圧力に関係なく、射出口２３を独立して開閉ならびに開閉量を、シリンダ１３の作動により駆動板２１を介して自由に調整することができる。
【０００６】
次に作用について説明する。図３の先端射出口１８および射出口２３が閉鎖された状態において、加熱シリンダ１１，７で可塑化，溶融された、異なる二色の樹脂原料はそれぞれ加圧され、第二射出ユニット“Ｂ”が図示されないシリンダの作動により後退することで、内筒ノズル８が弁座１９より離れ開放されて、第一樹脂２５は樹脂通路１７を流通して先端射出口１８より、図示されない金型に射出される。
【０００７】
その後、シリンダの復帰動作により内筒ノズル８は弁座１９に当接して樹脂通路１７は遮断される。次に、シリンダ１３の後退作動により駆動板２１を介して針弁２０が後退し、射出口２３が開放され第二樹脂２６が樹脂通路２４を流通し射出口２３より先端射出口１８を流通して、図示されない金型に射出される。
【０００８】
【発明が解決しようとする課題】
従来における二色成形の射出ノズルにおいて、第一射出ユニット“Ａ”で可塑化溶融された第一樹脂２５が、外筒ノズル９の内周面と内筒ノズル８の外周面によって形成される樹脂通路１７内を流通し、先端射出口１８より金型キャビティに射出されている第一射出ユニット“Ａ”の樹脂原料の色替えをする場合、色替えされる第一樹脂２５ａの流通押圧によって、樹脂通路１７内の第一樹脂２５（色替え前）を射出口１８より排出することで、樹脂通路１７内は第一樹脂２５ａに置換される。
【０００９】
しかし、図４に示すように供給口１０より供給される第一樹脂２５ａは、樹脂通路１７内を内筒ノズル８の両側外周を矢印のように流通するが、色替え前の第一樹脂２５が樹脂通路１７内の“Ｔ”部にデッドスペースを形成して残留し、供給口１０側とその反対側（樹脂通路１７の下側）では樹脂の流れが均等でなく、その合流点（図５に示す）における置換が完全に行えない。
【００１０】
従って、色替えして射出される第一樹脂２５ａに色替え前の第一樹脂２５が合流点において、微量ではあるが連続混在した状態で成形処置せざるを得ない状況になる。また、色替え置換に多量の樹脂供給を必要とし、置換に長時間を要しコストアップとなり品質精度・商品価値にも影響を与える問題点がある。
【００１１】
なお、第二樹脂２６の色替え時は、第二加熱シリンダ７が射出ノズルに直線的に連結されており、内筒ノズル８内の色替え置換をスムーズに行うことができる。
【００１２】
本発明は、従来の二色射出成形用ノズルに見られた前記問題点を解消し、樹脂材料の色替え置換を、少量の置換用樹脂量で置換前の樹脂の残留や混在を生ずることなく行える二色射出成形用ノズルを提供することを課題としている。
【００１３】
【課題を解決するための手段】
本発明は、二色射出成形用ノズルにおける前記課題を解決するために、内筒ノズルを外筒ノズルの内周部に摺動自在に嵌装し、該内筒ノズルの外周面に供給口の分岐溝と連絡された二条溝を螺旋状に周設することで第一樹脂通路を形成し、該第一樹脂通路は、二条溝の部位を上流側から下流側に向かって、同一外径の二条溝部位、次いでテーパ状のサイズダウン部位、最後に溝のない同一外径の直線部位で形成し、第一加熱シリンダから供給される樹脂材料を該第一樹脂通路によって、前記内筒ノズルの外周に導いて前進させ、前記外筒ノズルの先端射出口を流通して金型キャビティに射出するように構成され、該第一樹脂通路と前記内筒ノズル内へ直線的に供給される第二樹脂通路を連結させた構成の二色射出成形用ノズルを提供する。
【００１４】
このように構成した本発明の二色射出成形用ノズルにおいては、第一加熱シリンダによって可塑化溶融された第一樹脂は外筒ノズルに連結された供給口より、内筒ノズルの第一樹脂通路の分岐溝に供給され、該分岐溝に連絡された二条溝内をそれぞれ螺旋状に導かれて前進するが、同一外径の二条溝部位で二流に分かれ、テーパ状のサイズダウン部位で徐々に外筒ノズルの内周部を軸方向の流れに変えながら前進し、溝のない同一外径の直線部位で均一的な断面押圧を受けながら融合されるので、合流点での分離作用が解消されて、先端射出口より金型キャビティ内へ射出される。
【００１５】
また、樹脂色替えによる第一樹脂通路内の置換は、該第一樹脂通路を形成する内筒ノズルの二条溝によって樹脂が内筒ノズルの外周に導かれて円滑に前進されるので色替え前の樹脂が残留する箇所がなく、置換後の樹脂の混在もないし、置換用の樹脂量も少くてよい。
【００１６】
なお、第二樹脂通路の構造は従来例と同様であり説明を省略する。
また、本発明による二色射出成形用ノズルでは、前記したように内筒ノズルの外周面に周設した二条溝の部位を略３等分し、上流側の略３分の１を同一外径の二条溝部位とし、その略３分の１部位より３分の２部位までテーパ状にサイズダウン（二条溝の底まで）し、下流側の略３分の１を溝のない同一外径の直線部とした、内筒ノズルの外周部形状とするのが好ましい。
【００１７】
内筒ノズル外周面の二条溝を前記したように構成すると、二条溝内をそれぞれ螺旋状に導かれて前進する樹脂は、そのテーパ部より徐々に外筒ノズルの内周部を軸方向の流れに変えながら前進し、（テーパ部においては螺旋状の流れと軸方向の流れが混在する）テーパ部を通過した第一樹脂は直線部の第一樹脂通路内において、均等な押圧力をもって融合されて流通する樹脂の合流点での分離作用が良好に解消される。
【００１８】
【発明の実施の形態】
以下本発明の実施の形態を図１，図２によって説明する。
図１は本実施形態における二色成形ノズル部分のみを示す側断面図、図２は本実施形態の二色成形ノズルの作用説明図である。
なお、第一射出ユニット，第二射出ユニット，および第二樹脂のノズル機構については従来例に準ずるものであり図示しておらずその説明を省略する。
【００１９】
図１において、外筒ノズル３０は、先端に図示されない金型キャビティに係合する当接面３０ａと先端射出口３３を設けると共に、先端射出口３３の内方に弁座３４を設けた内部孔３０ｂによって形成され、第一射出ユニットの加熱シリンダに連結された供給口３２と連結されている。
【００２０】
外筒ノズル３０の内部孔３０ｂに内筒ノズル３１が摺動自在に嵌装され、図２に示す外筒ノズル３０の先端射出口３３が開放された状態において、内筒ノズル３１の外周に前記供給口３２と係合する部位より軸方向を左右に分離した分岐溝３８ａ，３８ｂを設け、該分岐溝３８ａ，３８ｂと夫々連絡する螺旋状の二条溝３９ａ，３９ｂを螺旋状に周設する。なお、分岐溝３８ａ，３８ｂと二条溝３９ａ，３９ｂの入口とは曲線的な形状をもって連絡する。
【００２１】
その二条溝３９ａ，３９ｂ部位を軸方向に略３等分し供給口側３分の１を完全な二条溝として残し、３分の１先端側の部位より３分の２部位までテーパ状にサイズダウン（二条溝３９の谷径に）し、残りの３分の１部位をサイズダウンされた外径の直線部とする。
【００２２】
内筒ノズル３１の凸凹および直線的な外周部と、外筒ノズル３０の内周孔３０ｂによって第一樹脂通路３７が形成され、弁座３４に内筒ノズル３１の先端部３１ａが当接することで第一樹脂通路３７を遮断する弁機構を構成している。
【００２３】
また、従来の第二射出ユニットの加熱シリンダに連結された針弁３６と内筒ノズル３１の内周部との間に第二樹脂通路４０が形成されて二色射出成形用ノズルとしている。
【００２４】
つぎに作用について説明する、図１において図示されない第一射出ユニットの加熱シリンダで可塑化溶融された第一樹脂４１が供給口３２より第一樹脂通路３７の分岐溝３８ａ，３８ｂに導入され、内筒ノズル３１が図示されない手段により図２の位置に後退し、内筒ノズル３１の先端部３１ａが弁座３４から離れて先端射出口３３を開放する。
【００２５】
前記分岐溝３８ａ，３８ｂより二方向に分離されて第一樹脂４１は、内筒ノズル３１外周の二条溝３９ａ，３９ｂ内を螺旋状（矢印⇒，→方向）に導びかれて前進し、テーパ部より徐々に二条溝３９ａ，３９ｂを外れて外筒ノズル３０内周を、軸方向に直進する流れに変えながら前進を続け、直線部では均一的な断面押圧を受けながら第一樹脂通路３７内を通り先端射出口３３より、図示されない金型のキャビティに射出される。
【００２６】
また、第一樹脂４１の色替えを行う場合は、第一射出ユニットの加熱シリンダで可塑化溶融された色替え樹脂４１ａを、供給口３２より第一樹脂通路３７に導入することによって、該第一樹脂通路３７内に滞留する色替え前の第一樹脂４１は、上記説明の作用工程を踏まえ内筒ノズル３１の分岐溝３８ａ，３８ｂより、二条溝３９ａ，３９ｂ内に押圧を受けて先端射出口３３より、外部に押し出されて第一樹脂は４１から４１ａに置換完了する。
【００２７】
【発明の効果】
以上説明したように、本発明は、内筒ノズルを外筒ノズルの内周部に摺動自在に嵌装し、該内筒ノズルの外周面に供給口の分岐溝と連絡された二条溝を螺旋状に周設することで第一樹脂通路を形成し、該第一樹脂通路は、二条溝の部位を上流側から下流側に向かって、同一外径の二条溝部位、次いでテーパ状のサイズダウン部位、最後に溝のない同一外径の直線部位で形成し、第一加熱シリンダから供給される樹脂材料を該第一樹脂通路の二条溝によって、前記内筒ノズルの外周に導いて前進させるように構成した二色射出成形用ノズルを提供するもので、本発明のこの二色射出成形用ノズルによると、樹脂材料の色替え置換を、少量の置換用樹脂量で置換前の樹脂の残留や混在を生ずることなく行える。
【００２８】
すなわち、本発明の二色射出成形用ノズルによれば、外筒ノズル内周と内筒ノズル外周との間に形成される第一樹脂通路において、樹脂供給口より導入される樹脂材料は分岐溝によって螺旋状の二条溝に分離されて流れ、テーパ部を設けた場合は、そのテーパ部において徐々に軸方向の流れに変更することにより、供給口で最小に限定された断面の二条溝で高い押圧を受けながら流通し、下流、例えばテーパ部より下流で軸方向の流れを加えて合流させることができる。
【００２９】
従って、本発明の二色射出成形用ノズルによれば、射出成形される樹脂材料の融合性を高めることを可能にするとともに、樹脂材料の色替え置換は少量の置換用樹脂量で前樹脂の残留・混在もなく処理可能として、色替え精度の向上と成形製品の品質精度・商品価値の向上を図り、作業効率の向上およびコストダウンと優れた効果をあげることができる。
【図面の簡単な説明】
【図１】本発明の実施の一形態に係る二色成形ノズルを示す側断面図。
【図２】本発明の実施の一形態に係る二色成形ノズルの作用説明図。
【図３】従来技術の二色成形ノズルの要部断面図。
【図４】従来技術の二色成形ノズルの作用説明図。
【図５】図４のＹ−Ｙ断面図。
【符号の説明】
３０ 外筒ノズル
３０ａ 当接面
３０ｂ 内部孔
３１ 内筒ノズル
３１ａ 先端部
３２ 供給口
３３ 先端射出口
３４ 弁座
３５ 射出口
３６ 針弁
３７ 第一樹脂通路
３８ａ，３８ｂ 分岐溝
３９ａ，３９ｂ 二条溝
４０ 第二樹脂通路
４１ 第一樹脂[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a two-color (sandwich) injection molding nozzle used in an injection molding machine.
[0002]
[Prior art]
As a method of obtaining two-color molding in a conventional injection molding machine, plasticizing and melting resin materials of two different colors in separate heating cylinders, respectively, and via a switching valve in front of one injection nozzle or via a switching valve. There are provided various devices in which the passages are connected so that they can be joined together, one example of which will be described with reference to FIGS.
[0003]
In FIG. 3, the first injection unit “A” and the second injection unit “B” are configured to plasticize and melt different resin materials and to inject the same, respectively. Is connected to the supply port 10 of the outer cylinder nozzle 9 via a connection pipe 12.
[0004]
At the end of the heating cylinder 7 of the second injection unit “B”, an inner cylinder nozzle 8 configured in a needle opening / closing type is mounted, and the inner cylinder nozzle 8 is provided concentrically with the outer cylinder nozzle. 9 are slidably fitted in the housing 9 and a resin passage 17 is formed therebetween.
[0005]
A valve seat 19 is provided inside the front end injection port 18 of the outer cylinder nozzle 9, and a valve mechanism for shutting off the resin passage 17 at the front end of the inner cylinder nozzle 8 is configured.
The inner cylinder nozzle 8 has a needle opening / closing nozzle structure of various well-known types, and independently of opening / closing and opening / closing amount of the injection port 23 regardless of the injection pressure of the first resin 25 and the second resin 26, the operation of the cylinder 13 Can be adjusted freely via the drive plate 21.
[0006]
Next, the operation will be described. In a state in which the tip injection port 18 and the injection port 23 in FIG. 3 are closed, the resin materials of two different colors plasticized and melted by the heating cylinders 11 and 7 are respectively pressurized, and the second injection unit “B” Is retracted by the operation of a cylinder (not shown), whereby the inner cylinder nozzle 8 is separated from the valve seat 19 and opened, and the first resin 25 flows through the resin passage 17 and is injected from the front end injection port 18 into a mold (not shown). Is done.
[0007]
Thereafter, the inner cylinder nozzle 8 comes into contact with the valve seat 19 by the return operation of the cylinder, and the resin passage 17 is shut off. Next, the needle valve 20 retreats via the drive plate 21 by the retraction operation of the cylinder 13, the injection port 23 is opened, the second resin 26 flows through the resin passage 24, and the second resin 26 flows from the injection port 23 through the tip injection port 18. And injected into a mold (not shown).
[0008]
[Problems to be solved by the invention]
In the conventional two-color injection nozzle, the first resin 25 plasticized and melted by the first injection unit “A” is formed by the inner peripheral surface of the outer cylinder nozzle 9 and the outer peripheral surface of the inner cylinder nozzle 8. When changing the color of the resin material of the first injection unit “A” that flows through the passage 17 and is injected into the mold cavity from the front end injection port 18, the color of the first resin 25 a to be changed in flow is pressed. By discharging the first resin 25 (before the color change) in the resin passage 17 from the injection port 18, the inside of the resin passage 17 is replaced with the first resin 25a.
[0009]
However, as shown in FIG. 4, the first resin 25a supplied from the supply port 10 flows through the inside of the resin passage 17 on both sides of the inner cylinder nozzle 8 as shown by arrows, but the first resin 25a before the color change is performed. Form a dead space at the “T” portion in the resin passage 17, and the resin flow is not uniform between the supply port 10 and the opposite side (below the resin passage 17). 5) cannot be completely performed.
[0010]
Therefore, at the confluence of the first resin 25a before the color change and the first resin 25a to be injected after the color change, the molding process must be performed in a small amount but continuously mixed. Further, there is a problem that a large amount of resin needs to be supplied for the color change replacement, the replacement requires a long time, the cost is increased, and the quality accuracy and the commercial value are affected.
[0011]
When the color of the second resin 26 is changed, the second heating cylinder 7 is linearly connected to the injection nozzle, and the color change and replacement in the inner cylinder nozzle 8 can be performed smoothly.
[0012]
The present invention solves the above-mentioned problems seen in the conventional two-color injection molding nozzle, and performs color change replacement of a resin material without causing residual or mixed resin before replacement with a small amount of replacement resin. An object of the present invention is to provide a two-color injection molding nozzle that can be used.
[0013]
[Means for Solving the Problems]
According to the present invention, in order to solve the above-described problem in the two-color injection molding nozzle, an inner cylinder nozzle is slidably fitted to an inner peripheral portion of an outer cylinder nozzle, and a supply port is formed on an outer peripheral surface of the inner cylinder nozzle. The first resin passage is formed by helically surrounding the two grooves connected to the branch groove, and the first resin passage has the same outer diameter from the upstream to the downstream of the portion of the two grooves. Article grooves site and then tapered downsizing site, finally formed at linear part of the same outer diameter with no grooves, thus the resin material supplied from the first heating cylinder to said first resin through passage, the inner tube It is configured to be guided to the outer periphery of the nozzle and advanced, flow through the tip injection port of the outer cylinder nozzle and inject into the mold cavity, and is supplied linearly into the first resin passage and the inner cylinder nozzle. Provided is a two-color injection molding nozzle having a configuration in which second resin passages are connected.
[0014]
In the two-color injection molding nozzle of the present invention thus configured, the first resin plasticized and melted by the first heating cylinder is supplied from the supply port connected to the outer cylinder nozzle to the first resin passage of the inner cylinder nozzle. Is supplied to the branch groove, and is guided spirally in the two grooves connected to the branch groove, respectively, and advances , but is divided into two streams at the double groove part having the same outer diameter, and gradually at the tapered size down part. The nozzle moves forward while changing the inner peripheral part of the outer cylinder nozzle to flow in the axial direction, and is fused while receiving uniform cross-section pressure at a straight part with the same outer diameter without grooves, eliminating the separation effect at the junction. Then, it is injected into the mold cavity from the tip injection port.
[0015]
In addition, the replacement in the first resin passage by the resin color change is performed before the color change because the resin is guided to the outer periphery of the inner cylinder nozzle by the double groove of the inner cylinder nozzle forming the first resin passage and smoothly advanced. There is no place where the resin remains, there is no mixed resin after substitution, and the amount of resin for substitution may be small.
[0016]
The structure of the second resin passage is the same as that of the conventional example, and the description is omitted.
Further, in the two-color injection molding nozzle according to the present invention, as described above, the portion of the double groove provided on the outer peripheral surface of the inner cylinder nozzle is divided into approximately three equal parts, and approximately one third on the upstream side has the same outer diameter. And the size is tapered from approximately one-third to two-thirds (to the bottom of the double-groove), and approximately one-third on the downstream side has the same outer diameter without grooves. It is preferable to form the outer peripheral portion of the inner cylinder nozzle as a linear portion.
[0017]
When the two grooves on the outer peripheral surface of the inner cylinder nozzle are configured as described above, the resin that is guided spirally in each of the two grooves and advances forward gradually flows in the inner peripheral part of the outer cylinder nozzle from the tapered part in the axial direction. The first resin having passed through the tapered portion (while the spiral flow and the axial flow are mixed in the tapered portion) is fused with uniform pressing force in the first resin passage of the straight portion. The separation action at the confluence of the resin flowing through the space is satisfactorily eliminated.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a side sectional view showing only the two-color forming nozzle portion in the present embodiment, and FIG. 2 is an explanatory diagram of the operation of the two-color forming nozzle in the present embodiment.
The first injection unit, the second injection unit, and the nozzle mechanism of the second resin are similar to the conventional example, and are not shown in the drawings and will not be described.
[0019]
In FIG. 1, an outer cylinder nozzle 30 has an abutment surface 30 a that engages with a not-shown mold cavity and a tip injection port 33 at the tip, and an internal hole provided with a valve seat 34 inside the tip injection port 33. 30b, which is connected to a supply port 32 connected to the heating cylinder of the first injection unit.
[0020]
The inner cylinder nozzle 31 is slidably fitted in the inner hole 30b of the outer cylinder nozzle 30, and in a state where the tip exit port 33 of the outer cylinder nozzle 30 shown in FIG. Branch grooves 38a and 38b are provided which are separated from the part engaged with the supply port 32 in the axial direction to the left and right, and spiral spiral grooves 39a and 39b communicating with the branch grooves 38a and 38b are spirally provided. The branch grooves 38a and 38b communicate with the entrances of the double grooves 39a and 39b in a curved shape.
[0021]
The two grooves 39a and 39b are divided into approximately three equal parts in the axial direction, and one third of the supply port side is left as a complete two groove, and the size is tapered from the one third tip side to two thirds. It is lowered (to the valley diameter of the double groove 39), and the remaining one-third portion is a linear portion having an outer diameter reduced in size.
[0022]
The first resin passage 37 is formed by the unevenness and the linear outer peripheral portion of the inner cylinder nozzle 31 and the inner peripheral hole 30b of the outer cylinder nozzle 30, and the distal end portion 31a of the inner cylinder nozzle 31 contacts the valve seat 34. A valve mechanism for shutting off the first resin passage 37 is configured.
[0023]
Further, a second resin passage 40 is formed between the needle valve 36 connected to the heating cylinder of the conventional second injection unit and the inner peripheral portion of the inner cylinder nozzle 31 to form a two-color injection molding nozzle.
[0024]
Next, the first resin 41 plasticized and melted by the heating cylinder of the first injection unit (not shown in FIG. 1) is introduced from the supply port 32 into the branch grooves 38a and 38b of the first resin passage 37. The cylindrical nozzle 31 is retracted to the position shown in FIG. 2 by means not shown, and the distal end portion 31a of the inner cylindrical nozzle 31 separates from the valve seat 34 to open the distal injection port 33.
[0025]
The first resin 41, which is separated in two directions from the branch grooves 38a and 38b, is guided spirally (in the directions indicated by arrows ⇒ and →) in the two grooves 39a and 39b on the outer periphery of the inner cylinder nozzle 31, and advances. The outer portion of the outer cylinder nozzle 30 continues to move forward while changing the inner circumference of the outer cylinder nozzle 30 into a flow that advances straight in the axial direction by gradually disengaging from the two grooves 39a and 39b from the portion. And is injected into the mold cavity (not shown) from the tip injection port 33.
[0026]
When the color of the first resin 41 is changed, the color changing resin 41a plasticized and melted by the heating cylinder of the first injection unit is introduced into the first resin passage 37 through the supply port 32, thereby forming the first resin 41. The first resin 41 before the color change stays in the one resin passage 37 is pressed into the two grooves 39a and 39b from the branch grooves 38a and 38b of the inner cylinder nozzle 31 based on the above-described operation process, and the tip of the first resin 41 is shot. The first resin is extruded from the outlet 33 to the outside, and the replacement of the first resin from 41 to 41a is completed.
[0027]
【The invention's effect】
As described above, in the present invention, the inner cylinder nozzle is slidably fitted to the inner peripheral portion of the outer cylinder nozzle, and the outer peripheral surface of the inner cylinder nozzle is provided with a double groove connected to the branch groove of the supply port. The first resin passage is formed by being spirally provided, and the first resin passage has a double groove portion having the same outer diameter from the upstream side to the downstream side of the double groove portion, and then has a tapered size. It is formed of a down portion, and finally, a linear portion having the same outer diameter without a groove, and guides the resin material supplied from the first heating cylinder to the outer periphery of the inner cylinder nozzle by the double groove of the first resin passage and advances it. The present invention provides a two-color injection molding nozzle configured as described above. According to the two-color injection molding nozzle of the present invention, the color change replacement of the resin material is performed with a small amount of the replacement resin and the residual resin before the replacement. And without mixing.
[0028]
That is, according to the two-color injection molding nozzle of the present invention, in the first resin passage formed between the inner periphery of the outer cylinder nozzle and the outer periphery of the inner cylinder nozzle, the resin material introduced from the resin supply port is provided with a branch groove. When the flow is separated into a spiral double groove and a tapered portion is provided, the flow is gradually changed to the axial direction in the tapered portion, so that the flow is high in the double groove having a cross section limited to a minimum at the supply port. It flows while receiving the pressure, and can be joined by adding an axial flow downstream, for example, downstream of the tapered portion.
[0029]
Therefore, according to the nozzle for two-color injection molding of the present invention, it is possible to enhance the fusibility of the resin material to be injection-molded, and the color change of the resin material can be replaced with a small amount of the resin for replacement. Since processing can be performed without residual / mixing, it is possible to improve color change accuracy, improve quality accuracy and commercial value of molded products, improve work efficiency, reduce costs, and achieve excellent effects.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a two-color forming nozzle according to an embodiment of the present invention.
FIG. 2 is an operation explanatory view of a two-color forming nozzle according to one embodiment of the present invention.
FIG. 3 is a sectional view of a main part of a conventional two-color molding nozzle.
FIG. 4 is a diagram illustrating the operation of a conventional two-color molding nozzle.
FIG. 5 is a sectional view taken along line YY of FIG. 4;
[Explanation of symbols]
Reference Signs List 30 outer cylinder nozzle 30a contact surface 30b inner hole 31 inner cylinder nozzle 31a tip 32 supply port 33 tip injection port 34 valve seat 35 injection port 36 needle valve 37 first resin passage 38a, 38b branch groove 39a, 39b double groove 40 Second resin passage 41 First resin

Claims (2)

二色射出成形用ノズルにおいて、内筒ノズルを外筒ノズルの内周部に摺動自在に嵌装し、該内筒ノズルの外周面に供給口の分岐溝と連絡された二条溝を螺旋状に周設することで第一樹脂通路を形成し、該第一樹脂通路は、二条溝の部位を上流側から下流側に向かって、同一外径の二条溝部位、次いでテーパ状のサイズダウン部位、最後に溝のない同一外径の直線部位で形成し、第一加熱シリンダから供給される樹脂材料を該第一樹脂通路によって、前記内筒ノズルの外周に導いて前進させ、前記外筒ノズルの先端射出口を流通して金型キャビティに射出するように構成され、該第一樹脂通路と前記内筒ノズル内へ直線的に供給される第二樹脂通路を連結させたことを特徴とする射出成形機の二色射出成形用ノズル。In the two-color injection molding nozzle, the inner cylinder nozzle is slidably fitted to the inner peripheral part of the outer cylinder nozzle, and the outer peripheral surface of the inner cylinder nozzle is spirally formed with the two groove connected to the branch groove of the supply port. A first resin passage is formed around the first resin passage, and the first resin passage extends from the upstream side to the downstream side of the double groove portion, the double groove portion having the same outer diameter, and then the tapered size reduction portion. and finally formed at linear part of the same outer diameter with no grooves, thus the resin material supplied from the first heating cylinder to said first resin passage path, is advanced guided to the outer periphery of the inner tube nozzle, said outer The first resin passage is connected to a second resin passage which is linearly supplied into the inner cylinder nozzle, and is configured to flow through a tip injection port of the cylinder nozzle to inject into the mold cavity. Nozzle for two-color injection molding of an injection molding machine. 請求項１において、内筒ノズルの外周面に周設された二条溝の部位を略３等分し、上流側の略３分の１を同一外径の二条溝部位とし、その略３分の１部位より３分の２部位までテーパ状にサイズダウン（二条溝の底まで）し、下流側の略３分の１を溝のない同一外径の直線部とした、内筒ノズルの外周部形状とすることを特徴とする射出成形機の二色射出成形用ノズル。In claim 1, the portion of the double groove provided on the outer peripheral surface of the inner cylinder nozzle is divided into approximately three equal parts, and approximately one third on the upstream side is formed as a double groove part having the same outer diameter. Outer peripheral portion of inner cylinder nozzle, tapered down from one site to two-thirds (down to the bottom of the double groove), and approximately one-third on the downstream side is a straight portion with no groove and the same outer diameter A two-color injection molding nozzle for an injection molding machine having a shape.
JP20324795A 1995-08-09 1995-08-09 Two-color injection molding nozzle of injection molding machine Expired - Fee Related JP3595384B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20324795A JP3595384B2 (en) 1995-08-09 1995-08-09 Two-color injection molding nozzle of injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20324795A JP3595384B2 (en) 1995-08-09 1995-08-09 Two-color injection molding nozzle of injection molding machine

Publications (2)

Publication Number Publication Date
JPH0948043A JPH0948043A (en) 1997-02-18
JP3595384B2 true JP3595384B2 (en) 2004-12-02

Family

ID=16470873

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20324795A Expired - Fee Related JP3595384B2 (en) 1995-08-09 1995-08-09 Two-color injection molding nozzle of injection molding machine

Country Status (1)

Country Link
JP (1) JP3595384B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11358313B2 (en) 2017-02-21 2022-06-14 Husky Injection Molding Systems Ltd. Co-injection hot runner nozzle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5840231A (en) * 1997-08-14 1998-11-24 Husky Injection Molding Systems Ltd. Valve gate assembly
US20010022321A1 (en) * 1999-11-08 2001-09-20 Abdeslam Bouti Melt flow mixer in an injection molding system
DE102004051750B4 (en) * 2004-10-23 2008-05-15 Otto Männer Innovation GmbH hot runner nozzle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11358313B2 (en) 2017-02-21 2022-06-14 Husky Injection Molding Systems Ltd. Co-injection hot runner nozzle

Also Published As

Publication number Publication date
JPH0948043A (en) 1997-02-18

Similar Documents

Publication Publication Date Title
US5783234A (en) Hot runner valve gate for eliminating unidirectional molecular orientation and weld lines from solidified resin used for forming molded articles
CA2148056C (en) High thermal capacity mold assembly
US4789318A (en) Device for manufacturing molded articles of plastics material
JP2983967B2 (en) Valve gate assembly and injection molding method
US6419116B1 (en) Molding nozzle gate valve
JP3595384B2 (en) Two-color injection molding nozzle of injection molding machine
JPH02153714A (en) Injection molding equipment
US5785999A (en) Injection apparatus for molding synthetic resin hollow or foamed body
JPH04147819A (en) Preplaticization injection molding machine and material replacing method
JP3631822B2 (en) Two-color injection molding nozzle
CN215791453U (en) Hot runner seals glue structure, hot runner system and injection molding machine
JP2808057B2 (en) Composite injection molding method
CA2216065C (en) An improved hot runner valve gate and method for eliminating unidirectional molecular orientation and weld lines from solidified resin used for forming molded articles
JPH05269794A (en) Injection molding machine for sandwich molding
JP4121964B2 (en) Nozzle gate valve for molding
JPS6227381Y2 (en)
JPH0234318A (en) Plasticizer for injection molding machine
JPH02219625A (en) Blow molding device
JPH0544891B2 (en)
JP4410602B2 (en) Hot runner mold for sandwich molding and sandwich molding method using the same
JP2005280252A (en) Sandwich molding method and die for injection-molding
JPH05293857A (en) Nozzle for hot runner of mold for thermoplastic resin
JPH0852774A (en) Continuous plasticizing injection molding machine
JPH03147821A (en) Fluid injection molding method using twin injection molding machine
JPS60219025A (en) Plunger-type injection molding device

Legal Events

Date Code Title Description
TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20040817

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20040903

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R371 Transfer withdrawn

Free format text: JAPANESE INTERMEDIATE CODE: R371

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

LAPS Cancellation because of no payment of annual fees