JPH1177750A - Injection nozzle device of injection molding machine - Google Patents

Injection nozzle device of injection molding machine

Info

Publication number
JPH1177750A
JPH1177750A JP23587897A JP23587897A JPH1177750A JP H1177750 A JPH1177750 A JP H1177750A JP 23587897 A JP23587897 A JP 23587897A JP 23587897 A JP23587897 A JP 23587897A JP H1177750 A JPH1177750 A JP H1177750A
Authority
JP
Japan
Prior art keywords
nozzle
injection
tip
injection nozzle
temperature
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
Application number
JP23587897A
Other languages
Japanese (ja)
Other versions
JP3358079B2 (en
Inventor
Nobuyuki Nakamura
伸之 中村
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.)
Nissei Plastic Industrial Co Ltd
Original Assignee
Nissei Plastic Industrial Co 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 Nissei Plastic Industrial Co Ltd filed Critical Nissei Plastic Industrial Co Ltd
Priority to JP23587897A priority Critical patent/JP3358079B2/en
Publication of JPH1177750A publication Critical patent/JPH1177750A/en
Application granted granted Critical
Publication of JP3358079B2 publication Critical patent/JP3358079B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To improve the quality of molding and to enhance the uniformity in the quality by maintaining a molten state of resin in an injection nozzle to be stable at all times and also to prevent surely a phenomenon of running and to make it possible to cope with various disturbances or the like exactly by controlling the temperature of the tip of the injection nozzle with high responsiveness and locally. SOLUTION: In this injection nozzle device of an injection molding machine, an injection nozzle 3 is divided into a nozzle tip part 3a corresponding to a heating zone Za in the fore end part and a nozzle main body part 3b being integral with a heating tube 5 and the nozzle tip part 3a is joined to the nozzle main body part 3b with a heat insulating part 6 interposed, while a nozzle temperature regulating part 2 controlling the nozzle tip part 3a to be at a lower temperature than the nozzle main body part 3b constantly is provided for the device.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は射出ノズルの前後方
向に複数の加熱ゾーンを設けた射出成形機の射出ノズル
装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection nozzle device of an injection molding machine provided with a plurality of heating zones in the front-rear direction of the injection nozzle.

【0002】[0002]

【従来の技術】一般に、射出成形機の加熱筒には、当該
加熱筒内の溶融樹脂を金型キャビティへ射出充填するた
めの射出ノズルを備えている。ところで、射出ノズル
は、その先端温度が高過ぎると射出ノズルの先端口から
溶融樹脂が垂れてしまういわゆる「鼻垂れ」現象を生
じ、他方、先端温度が低過ぎると射出ノズルの内部に樹
脂が詰まる「詰まり」現象を生ずる。したがって、射出
ノズルの先端温度を適温に維持することは、安定した成
形を行う上で極めて重要になる。
2. Description of the Related Art In general, a heating cylinder of an injection molding machine is provided with an injection nozzle for injecting and filling a molten resin in the heating cylinder into a mold cavity. By the way, the injection nozzle causes a so-called “nose dripping” phenomenon in which the molten resin drips from the tip opening of the injection nozzle when the tip temperature is too high, while the resin is clogged inside the injection nozzle when the tip temperature is too low. The "clogging" phenomenon occurs. Therefore, maintaining the tip temperature of the injection nozzle at an appropriate temperature is extremely important for performing stable molding.

【0003】そこで、本出願人は既に、射出ノズルの軸
方向に付設した複数のヒータと、最前部のヒータに対す
るノズルタッチ時の給電量を非ノズルタッチ時の給電量
よりも大きくなるように制御し、かつ他のヒータに対す
る給電量を非ノズルタッチ時及びノズルタッチ時とも同
一条件に制御する制御機能部を備えた射出成形機のノズ
ル加熱装置を、特開平6−262660号公報で提案し
た。同装置によれば、最前部の加熱ゾーンに対するノズ
ルタッチ時の加熱量を非ノズルタッチ時の加熱量よりも
大きく設定するため、ノズルタッチ時に射出ノズルの最
前部が金型に接して急激に温度低下する問題が解決され
る。
In view of this, the present applicant has already controlled a plurality of heaters provided in the axial direction of the injection nozzle and a power supply amount at the time of nozzle touch to the frontmost heater so as to be larger than a power supply amount at the time of non-nozzle touch. JP-A-6-262660 has proposed a nozzle heating device for an injection molding machine having a control function for controlling the amount of power supplied to other heaters under the same conditions both when the nozzle is not touched and when the nozzle is touched. According to the apparatus, the heating amount at the time of nozzle touch with respect to the foremost heating zone is set to be larger than the heating amount at the time of non-nozzle touch. The problem of degradation is solved.

【0004】[0004]

【発明が解決しようとする課題】しかし、上述した従来
のノズル加熱装置を備える射出ノズルは次のような問題
があった。
However, the injection nozzle provided with the above-mentioned conventional nozzle heating device has the following problems.

【0005】第一に、射出ノズルの先端温度及びその変
動は、当該射出ノズルにおける他の部位の温度に直接影
響するため、射出ノズル内における樹脂の溶融状態が不
安定になり、ショット容量が少ない場合などには成形品
質の低下及びバラつきを生じやすい。
First, the temperature of the tip of the injection nozzle and its fluctuation directly affect the temperature of other parts of the injection nozzle, so that the molten state of the resin in the injection nozzle becomes unstable and the shot capacity is small. In such cases, the molding quality is likely to deteriorate and vary.

【0006】第二に、射出ノズルの先端温度を高応答か
つ局部的に制御できないため、「鼻垂れ」現象の防止及
び各種外乱等に的確かつ確実に対応できない。
Second, since the tip temperature of the injection nozzle cannot be controlled locally with high response, it is impossible to prevent the "drooling" phenomenon and to cope with various disturbances, etc. accurately and reliably.

【0007】本発明はこのような従来の技術に存在する
課題を解決したものであり、射出ノズル内における樹脂
の溶融状態を常に安定に維持して、成形品質の向上及び
均質性を高めるとともに、射出ノズルの先端温度を高応
答かつ局部的に制御して、「鼻垂れ」現象を確実に防止
し、かつ各種外乱等に的確に対応できるようにした射出
成形機の射出ノズル装置の提供を目的とする。
The present invention has been made to solve the problems existing in the prior art, and always maintains the molten state of the resin in the injection nozzle stably to improve molding quality and homogeneity. The purpose of the present invention is to provide an injection nozzle device of an injection molding machine that controls the tip temperature of an injection nozzle with high response and locally to reliably prevent the "drooling" phenomenon and to appropriately cope with various disturbances. And

【0008】[0008]

【課題を解決するための手段及び実施の形態】本発明
は、射出ノズル3を前後方向に複数の加熱ゾーンZa,
Zbに分け、当該射出ノズル3の外周面に各加熱ゾーン
Za,Zbに対応したヒータ4a,4bを付設するとと
もに、各ヒータ4a,4bに通電して各加熱ゾーンZ
a,Zbの温度をそれぞれ制御するノズル温調部2を備
える射出成形機の射出ノズル装置1を構成するに際し
て、射出ノズル3を、先端部の加熱ゾーンZaに対応す
るノズル先端部3aと加熱筒5に一体のノズル本体部3
bに分割し、かつノズル先端部3aを断熱部6を介して
ノズル本体部3bに結合するとともに、ノズル先端部3
aをノズル本体部3bよりも常時低い温度に制御するノ
ズル温調部2を備えることを特徴とする。
According to the present invention, the injection nozzle 3 is provided with a plurality of heating zones Za,
Zb, heaters 4a, 4b corresponding to the respective heating zones Za, Zb are provided on the outer peripheral surface of the injection nozzle 3, and the respective heaters 4a, 4b are energized to supply the respective heating zones Z.
When configuring the injection nozzle device 1 of an injection molding machine including a nozzle temperature control unit 2 for controlling the temperatures of a and Zb, the injection nozzle 3 is connected to a nozzle tip 3a corresponding to the heating zone Za at the tip and a heating cylinder. Nozzle body 3 integral with 5
b, and the nozzle tip 3a is connected to the nozzle body 3b via the heat insulating part 6, and the nozzle tip 3
It is characterized by including a nozzle temperature control section 2 for controlling a to a temperature always lower than the nozzle body section 3b.

【0009】この場合、好適な実施の形態により、断熱
部6には断熱空間6s,6ss及び/又は断熱部材6m
を含ませることができる。一方、ノズル先端部3aは、
ノズル本体部3bよりも小径に形成するとともに、ノズ
ル先端部3aにおける樹脂通路7の容積はショット容量
の0.8%以下に、また、ノズル先端部3aの温度は樹
脂の流動開始温度付近にそれぞれ設定することが望まし
い。
In this case, according to a preferred embodiment, the heat insulating portion 6 includes heat insulating spaces 6s, 6ss and / or a heat insulating member 6m.
Can be included. On the other hand, the nozzle tip 3a
The diameter of the resin passage 7 at the nozzle tip 3a is 0.8% or less of the shot capacity, and the temperature of the nozzle tip 3a is near the resin flow start temperature. It is desirable to set.

【0010】これにより、ノズル先端部3aとノズル本
体部3bは、断熱空間6s,6ss及び/又は断熱部材
6mを含む断熱部6を介して断熱されるため、ノズル先
端部3a及びノズル本体部3bの温度は、相互に影響を
受けにくくなり、ノズル本体部3b内の樹脂の溶融状態
は安定に維持されるとともに、ノズル先端部3aの温度
は高応答かつ局部的に制御可能になる。
As a result, the nozzle tip 3a and the nozzle main body 3b are insulated through the heat insulating space 6 including the heat insulating spaces 6s, 6ss and / or the heat insulating member 6m. Are hardly influenced by each other, the molten state of the resin in the nozzle body 3b is stably maintained, and the temperature of the nozzle tip 3a can be controlled rapidly and locally.

【0011】[0011]

【実施例】次に、本発明に係る好適な実施例を挙げ、図
面に基づき詳細に説明する。
Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

【0012】まず、本実施例に係る射出ノズル装置1の
構成について、図1及び図2を参照して説明する。
First, the configuration of the injection nozzle device 1 according to the present embodiment will be described with reference to FIGS.

【0013】図1は、射出成形機における射出装置Mの
一部を示す。射出装置Mは加熱筒5を備え、この加熱筒
5にはスクリュ11を内蔵する。また、加熱筒5の外周
面には当該加熱筒5を加熱するヒータ(バンドヒータ
等)12a,12b,12c…を付設する。
FIG. 1 shows a part of an injection device M in an injection molding machine. The injection device M includes a heating cylinder 5, and a screw 11 is built in the heating cylinder 5. Further, heaters (such as band heaters) 12a, 12b, 12c,... For heating the heating cylinder 5 are provided on the outer peripheral surface of the heating cylinder 5.

【0014】一方、加熱筒5の前端には射出ノズル3を
備える。射出ノズル3は、加熱筒5の前端に一体に設け
たノズル本体部3bと、このノズル本体部3bの前端に
結合するノズル先端部3aからなる。
On the other hand, an injection nozzle 3 is provided at the front end of the heating cylinder 5. The injection nozzle 3 includes a nozzle body 3b integrally provided at the front end of the heating cylinder 5, and a nozzle tip 3a coupled to the front end of the nozzle body 3b.

【0015】ノズル本体部3bは、図2に示すように、
内部に樹脂通路13を有し、また、先端面3bfの中央
には前方に突出した結合部14を有する。結合部14は
外周面の一部、即ち、加熱筒5寄りの外周面上に雄ネジ
部15を有するとともに、結合部14の前端面の中央に
は前方に突出し、かつ当該結合部14よりも小径となる
位置決め部16を有する。なお、ノズル本体部3bは、
実施例のように加熱筒5に一体形成してもよいし、或い
は別体に形成したものを取付けてもよい。
The nozzle body 3b is, as shown in FIG.
A resin passage 13 is provided inside, and a connecting portion 14 protruding forward is provided at the center of the distal end face 3bf. The coupling portion 14 has a male screw portion 15 on a part of the outer peripheral surface, that is, on the outer peripheral surface near the heating cylinder 5, and projects forward at the center of the front end surface of the coupling portion 14. It has a positioning portion 16 having a small diameter. The nozzle body 3b is
As in the embodiment, it may be formed integrally with the heating cylinder 5, or may be formed separately.

【0016】他方、ノズル先端部3aは、ノズル本体部
3bよりも小径に形成し、後端面3arの中央には、上
述したノズル本体部3b側の結合部14及び位置決め部
16が入る凹部17を有する。なお、ノズル本体部3b
の小径化は、熱容量を小さくして温度制御時の応答性を
高めることができる。また、凹部17は、位置決め部1
6に嵌合する位置決め凹部18と、結合部14を収容す
る結合凹部20を有し、結合凹部20の内周面には、結
合部14側の雄ネジ部15が螺合する雌ネジ部19を有
する。さらに、ノズル先端部3aの内部には樹脂通路7
を有し、この樹脂通路7は、上記樹脂通路13に接続す
る後樹脂通路7r及びこの後樹脂通路7rとノズル先端
部3aの前端面に連通する細い前樹脂通路(ノズルラン
ド)7fからなる。この場合、樹脂通路7の容積はショ
ット容量の0.8%以下に設定する。したがって、ノズ
ル先端部3aにおける樹脂通路7の長さは、ノズル本体
部3bの樹脂通路13の長さに対して1/4程度とな
り、射出ノズル3の先端側一部のみを局部的に温度制御
可能になる。
On the other hand, the nozzle tip 3a is formed to have a smaller diameter than the nozzle body 3b, and the center of the rear end face 3ar is provided with a recess 17 into which the above-described coupling portion 14 and positioning portion 16 of the nozzle body 3b are inserted. Have. The nozzle body 3b
The reduction in the diameter of the can reduce the heat capacity and enhance the responsiveness during temperature control. Further, the recess 17 is provided in the positioning section 1.
6 and a coupling recess 20 for accommodating the coupling portion 14. A female thread portion 19 with which the male screw portion 15 of the coupling portion 14 is screwed is provided on the inner peripheral surface of the coupling recess 20. Having. Further, a resin passage 7 is provided inside the nozzle tip 3a.
The resin passage 7 includes a rear resin passage 7r connected to the resin passage 13, and a thin front resin passage (nozzle land) 7f communicating with the rear resin passage 7r and the front end face of the nozzle tip 3a. In this case, the volume of the resin passage 7 is set to 0.8% or less of the shot capacity. Therefore, the length of the resin passage 7 at the nozzle tip 3a is about 1/4 of the length of the resin passage 13 of the nozzle body 3b, and only a part of the tip of the injection nozzle 3 is locally subjected to temperature control. Will be possible.

【0017】また、ノズル先端部3aとノズル本体部3
bを結合した際に、ノズル先端部3aとノズル本体部3
b間に、断熱空間6s(断熱部6)が生ずるように構成
する。即ち、ノズル本体部3bにおける結合部14の外
径は、結合凹部20の内径よりも小さく形成するととも
に、位置決め部16は前部16fと後部16rに分け、
前部16fの外径は位置決め凹部18の内径に略一致さ
せ、かつ後部16rの外径は位置決め凹部18の内径よ
りも小さく形成する。さらに、位置決め部16の前後方
向長さは、位置決め凹部18の前後方向長さよりも長く
形成する。これにより、ノズル先端部3aとノズル本体
部3b間には、図2に示す所定の隙間による断熱空間6
sが形成される。
The nozzle tip 3a and the nozzle body 3
b, the nozzle tip 3a and the nozzle body 3
A configuration is made such that a heat insulating space 6s (heat insulating portion 6) is generated between b. That is, the outer diameter of the coupling portion 14 in the nozzle body 3b is formed smaller than the inner diameter of the coupling concave portion 20, and the positioning portion 16 is divided into a front portion 16f and a rear portion 16r.
The outer diameter of the front portion 16f is made substantially equal to the inner diameter of the positioning recess 18, and the outer diameter of the rear portion 16r is formed smaller than the inner diameter of the positioning recess 18. Further, the length of the positioning portion 16 in the front-rear direction is longer than the length of the positioning recess 18 in the front-rear direction. Thereby, a heat insulating space 6 having a predetermined gap shown in FIG.
s is formed.

【0018】一方、射出ノズル装置1には上述した射出
ノズル3を加熱制御するノズル温調部2を備える。ノズ
ル温調部2は射出ノズル3に付設するヒータ(バンドヒ
ータ等)4a,4bを備え、ヒータ4aはノズル先端部
3aの外周面に付設するとともに、ヒータ4bはノズル
本体部3bの外周面に付設する。また、ノズル先端部3
aには熱電対31aを付設する。この場合、熱電対31
aはノズル先端部3aの外周面から内部に挿入するとと
もに、熱電対31aの先端検出部が前方に位置するよう
に傾斜させる。特に、当該先端検出部の位置は、図2に
示すようにノズルランド(前樹脂通路7f)長さの2/
3程度内側に入った位置でノズルランドに近い位置を選
定する。なお、ノズルランド長さはノズルランド径に対
して6〜8倍程度に選定する。他方、熱電対31bはノ
ズル本体部3bの前後方向ほぼ中央位置における外周面
に対してほぼ直角になるようにして内部に挿入する。さ
らに、30はコントローラであり、この入力側には熱電
対31a,31bを接続するとともに、出力側にはヒー
タ4a,4b及び加熱筒5側のヒータ12a,12b,
12c…を接続する。
On the other hand, the injection nozzle device 1 is provided with a nozzle temperature control section 2 for controlling the heating of the injection nozzle 3 described above. The nozzle temperature control unit 2 includes heaters (band heaters and the like) 4a and 4b attached to the injection nozzle 3. The heater 4a is attached to the outer peripheral surface of the nozzle tip 3a, and the heater 4b is attached to the outer peripheral surface of the nozzle body 3b. Attached. The nozzle tip 3
a is provided with a thermocouple 31a. In this case, the thermocouple 31
a is inserted from the outer peripheral surface of the nozzle tip 3a to the inside, and is inclined so that the tip detector of the thermocouple 31a is located forward. In particular, the position of the tip detection unit is, as shown in FIG. 2, 2 / L of the length of the nozzle land (front resin passage 7f).
A position close to the nozzle land is selected at a position about 3 inside. The length of the nozzle land is selected to be about 6 to 8 times the nozzle land diameter. On the other hand, the thermocouple 31b is inserted into the nozzle body 3b so as to be substantially perpendicular to the outer peripheral surface at the substantially central position in the front-rear direction of the nozzle body 3b. Reference numeral 30 denotes a controller, which has thermocouples 31a, 31b connected to its input side, and heaters 4a, 4b and heaters 12a, 12b,
12c are connected.

【0019】よって、ノズル先端部3aは加熱ゾーンZ
a,ノズル本体部3bは加熱ゾーンZbとなり、各加熱
ゾーンZa,Zbの温度は予め設定した設定温度になる
ように、コントローラ30によってそれぞれ個別にフィ
ードバック制御される。
Therefore, the nozzle tip 3a is located in the heating zone Z
a, the nozzle body 3b becomes the heating zone Zb, and the controller 30 individually performs feedback control so that the temperature of each heating zone Za, Zb becomes the preset temperature.

【0020】次に、本実施例に係る射出ノズル装置1の
機能(動作)について、各図を参照して説明する。
Next, the function (operation) of the injection nozzle device 1 according to this embodiment will be described with reference to the drawings.

【0021】まず、コントローラ30は熱電対31a,
31bから得る温度検出結果に基づいて、各加熱ゾーン
Za,Zbの温度がそれぞれ予め設定した設定温度とな
るように各ヒータ4a,4bに通電してフィードバック
制御する。この場合、加熱ゾーンZbの温度は加熱筒5
の温度に一致させる。一例として、樹脂(成形材料)が
ポリカーボネイトの場合、加熱ゾーンZbの温度は28
0〜300℃程度に設定される。
First, the controller 30 includes a thermocouple 31a,
Based on the temperature detection result obtained from 31b, the heaters 4a and 4b are energized and feedback controlled so that the temperatures of the heating zones Za and Zb become the preset temperatures, respectively. In this case, the temperature of the heating zone Zb is
To match the temperature. As an example, when the resin (molding material) is polycarbonate, the temperature of the heating zone Zb is 28
It is set to about 0 to 300 ° C.

【0022】他方、加熱ゾーンZaの設定温度は加熱ゾ
ーンZbの設定温度よりも低い温度に設定するととも
に、成形動作中は、常時、設定温度になるように制御さ
れる。この場合、加熱ゾーンZa(ノズル先端部3a)
の設定温度は、樹脂の流動開始温度付近に設定する。具
体的には「鼻垂れ」現象を生じない温度及び「詰まり」
現象を生じない温度を考慮して設定する。一例として、
上述したポリカーボネイトの場合には、加熱ゾーンZa
の温度が180〜220℃程度に設定される。
On the other hand, the set temperature of the heating zone Za is set to be lower than the set temperature of the heating zone Zb, and is controlled so as to be always at the set temperature during the molding operation. In this case, the heating zone Za (nozzle tip 3a)
Is set near the resin flow start temperature. Specifically, temperature and "clogging" that do not cause the "nose dripping" phenomenon
Set in consideration of the temperature that does not cause the phenomenon. As an example,
In the case of the polycarbonate described above, the heating zone Za
Is set to about 180 to 220 ° C.

【0023】なお、図3には変更実施例を示す。変更実
施例は、断熱部6を構成する断熱空間6sに対し、さら
に断熱部材6m及び断熱空間6ssを加えた点が、図2
に示した実施例と異なる。即ち、変更実施例は、位置決
め部16の前端面と位置決め凹部18間に、リング状に
形成したセラミック板(断熱板)等の断熱部材6mを介
在させるとともに、結合凹部20の内周面に直角に切り
込んだリング凹溝による断熱空間6ssを追加した。こ
の場合、断熱部材6mは、位置決め部16の前端面にセ
ラミック材等の断熱材を溶着させる方法により付加して
もよい。これにより、ノズル先端部3aとノズル本体部
3b間におけるより高度の断熱性が確保される。なお、
図3において図2と同一部分には同一符号を付し、その
構成を明確にするとともに、詳細な説明は省略する。
FIG. 3 shows a modified embodiment. The modified embodiment is different from FIG. 2 in that a heat insulating member 6 m and a heat insulating space 6 ss are further added to the heat insulating space 6 s constituting the heat insulating portion 6.
Is different from the embodiment shown in FIG. That is, in the modified embodiment, a heat insulating member 6 m such as a ring-shaped ceramic plate (heat insulating plate) is interposed between the front end surface of the positioning portion 16 and the positioning concave portion 18, and is perpendicular to the inner peripheral surface of the coupling concave portion 20. A heat insulating space 6ss by a ring groove cut into the groove was added. In this case, the heat insulating member 6m may be added by a method of welding a heat insulating material such as a ceramic material to the front end face of the positioning portion 16. This ensures a higher degree of heat insulation between the nozzle tip 3a and the nozzle body 3b. In addition,
3, the same parts as those in FIG. 2 are denoted by the same reference numerals, to clarify the configuration, and omit detailed description.

【0024】よって、このような各実施例による射出ノ
ズル装置1により、ノズル先端部3aとノズル本体部3
bは、断熱空間6s,6ss及び/又は断熱部材6mを
介して断熱されるため、ノズル先端部3a及びノズル本
体部3bの温度は、相互に影響を受けにくくなる。この
結果、ノズル本体部3b内の樹脂の溶融状態は安定に維
持され、成形品質の向上及び均質性が高められる。
Therefore, the injection nozzle device 1 according to each of the embodiments described above allows the nozzle tip 3a and the nozzle body 3
Since b is insulated through the heat insulating spaces 6s and 6ss and / or the heat insulating member 6m, the temperatures of the nozzle tip 3a and the nozzle body 3b are less likely to be influenced by each other. As a result, the molten state of the resin in the nozzle body 3b is stably maintained, and the molding quality is improved and the homogeneity is improved.

【0025】また、射出ノズル3の先端温度を高応答か
つ局部的に制御できるため、「鼻垂れ」現象を確実に防
止できるとともに、各種外乱等に的確に対応できる。こ
の場合、特に、制御の高応答性は、ノズル先端部3a及
びノズル本体部3b間の断熱及びノズル先端部3aの小
径化により実現されるとともに、局部的な制御は、ノズ
ル先端部3a及びノズル本体部3b間の断熱及びノズル
先端部3aにおける樹脂通路7の容積設定により実現さ
れる。そして、ノズル先端部3aをノズル本体部3bよ
りも常時低い温度に制御することにより、「鼻垂れ」現
象が確実に防止される。この場合、ノズル先端部3aは
常時低い温度に制御されるも局部的な制御となる。した
がって、この部分の溶融樹脂はショット容量に対して僅
かとなり、成形品質等に悪影響を与えることはない。
In addition, since the tip temperature of the injection nozzle 3 can be controlled in a high response and locally, the "drooling" phenomenon can be reliably prevented, and various disturbances can be properly dealt with. In this case, particularly, high responsiveness of the control is realized by heat insulation between the nozzle tip 3a and the nozzle body 3b and reduction in the diameter of the nozzle tip 3a, and local control is performed by the nozzle tip 3a and the nozzle 3a. This is realized by heat insulation between the main body parts 3b and setting of the volume of the resin passage 7 at the nozzle tip part 3a. By controlling the temperature of the nozzle tip 3a to be always lower than the temperature of the nozzle body 3b, the "drooling" phenomenon is reliably prevented. In this case, the nozzle tip 3a is always controlled at a low temperature but is locally controlled. Therefore, the amount of the molten resin in this portion becomes small with respect to the shot capacity, and does not adversely affect the molding quality and the like.

【0026】以上、実施例について詳細に説明したが、
本発明はこのような実施例に限定されるものではなく、
細部の構成,形状,素材等おいて、本発明の要旨を逸脱
しない範囲で任意に変更,追加,削除することができ
る。例えば、ノズル先端部3aとノズル本体部3bの素
材は同一であってもよいし異ならせてもよい。また、断
熱部6はノズル先端部3aとノズル本体部3b間の一部
であっもよいし全部であってもよい。さらに、加熱ゾー
ンZa,Zbは前後に二つ設けた場合を例示したが一般
的には複数の加熱ゾーンを設定できる。
The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The detailed configuration, shape, material, etc. can be arbitrarily changed, added, or deleted without departing from the gist of the present invention. For example, the material of the nozzle tip 3a and the material of the nozzle body 3b may be the same or different. Further, the heat insulating portion 6 may be a part or the whole between the nozzle tip 3a and the nozzle body 3b. Furthermore, the case where two heating zones Za and Zb are provided before and after is illustrated, but generally a plurality of heating zones can be set.

【0027】[0027]

【発明の効果】このように、本発明に係る射出成形機の
射出ノズル装置は、射出ノズルを、先端部の加熱ゾーン
に対応するノズル先端部と加熱筒に一体のノズル本体部
に分割し、かつノズル先端部を断熱部を介してノズル本
体部に結合するとともに、ノズル先端部をノズル本体部
よりも常時低い温度に制御するノズル温調部を備えるた
め、次のような顕著な効果を奏する。
As described above, in the injection nozzle device of the injection molding machine according to the present invention, the injection nozzle is divided into a nozzle tip corresponding to the heating zone at the tip and a nozzle body integrated with the heating cylinder. In addition, since the nozzle tip is connected to the nozzle body via the heat insulating part and the nozzle tip is always controlled to a lower temperature than the nozzle body, the following remarkable effects are obtained. .

【0028】 射出ノズル内における樹脂の溶融状態
を常に安定に維持できるため、成形品質の向上及び均質
性を高めることができる。
Since the molten state of the resin in the injection nozzle can always be maintained stably, it is possible to improve molding quality and homogeneity.

【0029】 射出ノズルの先端温度を高応答かつ局
部的に制御できるため、「鼻垂れ」現象を確実に防止
し、また、各種外乱等に的確に対応できる。
Since the tip temperature of the injection nozzle can be controlled locally with high response, the “drooling” phenomenon can be reliably prevented, and various disturbances can be properly dealt with.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本実施例に係る射出ノズル装置における射出ノ
ズルの一部断面側面を含む全体構成図、
FIG. 1 is an overall configuration diagram including a partial cross-sectional side surface of an injection nozzle in an injection nozzle device according to the present embodiment;

【図2】同射出ノズル装置における射出ノズルの断面側
面図、
FIG. 2 is a cross-sectional side view of an injection nozzle in the injection nozzle device.

【図3】変更実施例に係る射出ノズル装置における射出
ノズルの断面側面図、
FIG. 3 is a sectional side view of an injection nozzle in an injection nozzle device according to a modified embodiment.

【符号の説明】[Explanation of symbols]

1 射出ノズル装置 2 ノズル温調部 3 射出ノズル 3a ノズル先端部 3b ノズル本体部 4a ヒータ 4b ヒータ 5 加熱筒 6 断熱部 6s 断熱空間 6ss 断熱空間 6m 断熱部材 7 樹脂通路 Za 加熱ゾーン Zb 加熱ゾーン DESCRIPTION OF SYMBOLS 1 Injection nozzle apparatus 2 Nozzle temperature control part 3 Injection nozzle 3a Nozzle tip part 3b Nozzle body part 4a Heater 4b Heater 5 Heating cylinder 6 Heat insulation part 6s Heat insulation space 6s Heat insulation space 6m Heat insulation member 7 Resin passage Za Heating zone Zb Heating zone

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 射出ノズルを前後方向に複数の加熱ゾー
ンに分け、当該射出ノズルの外周面に各加熱ゾーンに対
応したヒータを付設するとともに、各ヒータに通電して
各加熱ゾーンの温度をそれぞれ制御するノズル温調部を
備える射出成形機の射出ノズル装置において、前記射出
ノズルを、先端部の加熱ゾーンに対応するノズル先端部
と加熱筒に一体のノズル本体部に分割し、かつ前記ノズ
ル先端部を断熱部を介して前記ノズル本体部に結合する
とともに、前記ノズル先端部を前記ノズル本体部よりも
常時低い温度に制御するノズル温調部を備えることを特
徴とする射出成形機の射出ノズル装置。
1. An injection nozzle is divided into a plurality of heating zones in the front-rear direction, heaters corresponding to the respective heating zones are provided on the outer peripheral surface of the injection nozzle, and the respective heaters are energized so that the temperatures of the respective heating zones are respectively set. In an injection nozzle device of an injection molding machine having a nozzle temperature control unit to be controlled, the injection nozzle is divided into a nozzle tip corresponding to a heating zone at a tip and a nozzle body integrated with a heating cylinder, and the nozzle tip is An injection nozzle for an injection molding machine, comprising: a nozzle temperature control unit that controls a temperature of the tip of the nozzle to be always lower than that of the nozzle body while coupling the unit to the nozzle body via a heat insulating unit. apparatus.
【請求項2】 前記断熱部には断熱空間及び/又は断熱
部材を含むことを特徴とする請求項1記載の射出成形機
の射出ノズル装置。
2. The injection nozzle device for an injection molding machine according to claim 1, wherein the heat insulating portion includes a heat insulating space and / or a heat insulating member.
【請求項3】 前記ノズル先端部は前記ノズル本体部よ
りも小径に形成することを特徴とする請求項1記載の射
出成形機の射出ノズル装置。
3. An injection nozzle device for an injection molding machine according to claim 1, wherein said nozzle tip is formed to have a smaller diameter than said nozzle body.
【請求項4】 前記ノズル先端部における樹脂通路の容
積はショット容量の0.8%以下に設定することを特徴
とする請求項1記載の射出成形機の射出ノズル装置。
4. The injection nozzle device for an injection molding machine according to claim 1, wherein the volume of the resin passage at the nozzle tip is set to 0.8% or less of the shot capacity.
【請求項5】 前記ノズル先端部の温度は樹脂の流動開
始温度付近に設定することを特徴とする請求項1記載の
射出成形機の射出ノズル装置。
5. The injection nozzle device for an injection molding machine according to claim 1, wherein the temperature of the nozzle tip is set near the flow start temperature of the resin.
JP23587897A 1997-09-01 1997-09-01 Injection nozzle device of injection molding machine Expired - Fee Related JP3358079B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23587897A JP3358079B2 (en) 1997-09-01 1997-09-01 Injection nozzle device of injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23587897A JP3358079B2 (en) 1997-09-01 1997-09-01 Injection nozzle device of injection molding machine

Publications (2)

Publication Number Publication Date
JPH1177750A true JPH1177750A (en) 1999-03-23
JP3358079B2 JP3358079B2 (en) 2002-12-16

Family

ID=16992591

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3358079B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103029273A (en) * 2012-12-07 2013-04-10 宁波新海太塑料机械有限公司 Injection part of injection molding machine
US20150298377A1 (en) * 2014-04-17 2015-10-22 Nissei Plastic Industrial Co., Ltd. Injection device having two-piece nozzle, jig for use in assembling two-piece nozzle, and method of assembling two-piece nozzle
WO2019111693A1 (en) * 2017-12-04 2019-06-13 オムロン株式会社 Resin temperature detecting device for injection molding machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103029273A (en) * 2012-12-07 2013-04-10 宁波新海太塑料机械有限公司 Injection part of injection molding machine
US20150298377A1 (en) * 2014-04-17 2015-10-22 Nissei Plastic Industrial Co., Ltd. Injection device having two-piece nozzle, jig for use in assembling two-piece nozzle, and method of assembling two-piece nozzle
US9616604B2 (en) * 2014-04-17 2017-04-11 Nissei Plastic Industrial Co., Ltd. Injection device having two-piece nozzle, jig for use in assembling two-piece nozzle, and method of assembling two-piece nozzle
WO2019111693A1 (en) * 2017-12-04 2019-06-13 オムロン株式会社 Resin temperature detecting device for injection molding machine
JP2019098630A (en) * 2017-12-04 2019-06-24 オムロン株式会社 Resin temperature detection device for injection molding machine
CN111032307A (en) * 2017-12-04 2020-04-17 欧姆龙株式会社 Resin temperature detecting device for injection molding machine

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