JP2537133B2 - Nozzle for plastic injection mold - Google Patents
Nozzle for plastic injection moldInfo
- Publication number
- JP2537133B2 JP2537133B2 JP5263130A JP26313093A JP2537133B2 JP 2537133 B2 JP2537133 B2 JP 2537133B2 JP 5263130 A JP5263130 A JP 5263130A JP 26313093 A JP26313093 A JP 26313093A JP 2537133 B2 JP2537133 B2 JP 2537133B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- nozzle body
- mold
- temperature
- sleeve
- 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
Links
- 238000002347 injection Methods 0.000 title claims description 14
- 239000007924 injection Substances 0.000 title claims description 14
- 239000004033 plastic Substances 0.000 title claims description 13
- 239000011347 resin Substances 0.000 claims description 22
- 229920005989 resin Polymers 0.000 claims description 22
- 238000000465 moulding Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000002470 thermal conductor Substances 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000004431 polycarbonate resin Substances 0.000 description 2
- 229920005668 polycarbonate resin Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011800 void 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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
Description
【０００１】[0001]
【産業上の利用分野】本発明は高温状態で溶融流動して
いる樹脂を成形品の形状に冷却固化される金型内に接続
するプラスチック射出成形金型用ノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic injection molding nozzle for connecting a resin which is melted and fluidized at a high temperature into a mold which is cooled and solidified into the shape of a molded product.
【０００２】[0002]
【従来の技術】プラスチック射出成形金型用ノズルは、
金型に離接可能に設けられており、高温状態で溶融流動
している樹脂を金型内のキャビティに射出する。このプ
ラスチック射出成形金型用ノズルは内部の樹脂を適温に
保つために外周部に設けられたヒータにより加熱されて
いる。最近の金型装置には高い生産性が要求されてお
り、射出のサイクルの短縮に関連して型の温度変化サイ
クルの変動も大きい。通常プラスチック射出成形金型用
ノズルの前記金型に接触する先端部分が前記金型の温度
の影響を受け低下する。その部分を外周にまいたヒータ
で加温しようとすると他の部分も加熱され、内部の通路
中のプラスチックが分解して変質するおそれがあった。2. Description of the Related Art Nozzles for plastic injection molds are
The resin is provided so as to be separable from and in contact with the mold, and the resin that is melted and flowing at a high temperature is injected into the cavity in the mold. The nozzle for the plastic injection mold is heated by a heater provided on the outer peripheral portion in order to keep the internal resin at an appropriate temperature. A high productivity is required for a recent mold device, and the variation of the mold temperature change cycle is large in association with the shortening of the injection cycle. Normally, the tip portion of the nozzle for the plastic injection molding die, which comes into contact with the die, is affected by the temperature of the die and is lowered. If it is attempted to heat the portion with a heater spread around the outer periphery, the other portion is also heated, and the plastic in the internal passage may be decomposed and deteriorated.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、ノズ
ルの金型に接触している部分の近傍の温度を集中的に制
御することにより前述した不都合を解消し高速射出成形
に適したプラスチック射出成形金型用ノズルを提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned inconvenience by centrally controlling the temperature in the vicinity of the portion of the nozzle that is in contact with the mold and to make a plastic suitable for high-speed injection molding. An object is to provide a nozzle for an injection mold.
【０００４】[0004]
【課題を解決するための手段】前述の目的を達成するた
めに本発明によるプラスチック射出成形金型用ノズル
は、一端で成形用金型に接触し他端側から供給される高
温の溶融樹脂を金型に接続するノズル本体と、前記ノズ
ル本体の前記一端側で熱的かつ機械的に前記ノズルに結
合させられ前記ノズル本体の他端方向に空隙もしくは熱
の不良導体を介して被せられている熱良伝導体材料から
なるスリーブと、前記スリーブの外周に熱的に接続され
ているヒータから構成されている。In order to achieve the above-mentioned object, a nozzle for a plastic injection molding die according to the present invention comprises a high temperature molten resin which comes into contact with the molding die at one end and is supplied from the other end. A nozzle body that is connected to a mold and is thermally and mechanically coupled to the nozzle at the one end side of the nozzle body and is covered in the other end direction of the nozzle body through a gap or a poor heat conductor. It is composed of a sleeve made of a good thermal conductor material and a heater thermally connected to the outer circumference of the sleeve.
【０００５】[0005]
【実施例】以下図面等を参照して本発明によるプラスチ
ック射出成形金型用ノズルをさらに詳しく説明する。図
１は、本発明によるプラスチック射出成形金型用ノズル
の実施例の断面図である。ノズル本体１は鋼材で作られ
ており、内部に樹脂通路が形成されている。ノズル本体
１基部は高温に保たれているとりつけ部８にねじ結合さ
せられている。ノズル本体１の端部は円錐状にしぼられ
先端の円柱状の部分で型６に接触させられる。円柱状の
部分の中央に射出孔１ａが設けられている。スリーブ４
は熱伝導率の大きい金属ベリリュム銅で作られている。
スリーブ４の内径の大部分は前記ノズル本体１の外形よ
り僅かに大きい。スリーブ４は先端の内径部で前記ノズ
ル本体１の先端の円柱状部分の外形に機械的および熱的
に結合させられている。このとき前記熱結合部、すなわ
ち先端の円柱部、前記円柱部に連接する円錐部、前記円
錐部に連接する大きい径の円柱部以外の大部分ではノズ
ル本体１の外径とスリーブ４の内径間に空隙２が確保さ
れている。スリーブ４の図中の上端側内径とノズル本体
１の対応部分外径間に熱絶縁材料のリングを配置して熱
絶縁空間を確保するように構成することができる。また
ノズル本体１の外周またはスリーブの内周に小さい径ま
たは小さい幅の突起を設け、極めて大きい熱抵抗で連絡
させ、空間を確保することもできる。ヒータ３はスリー
ブ４の外形に巻かれた電熱線を絶縁物でかためた円筒状
のものであり図示しない電線を介して電力が供給され
る。ヒータ３に供給される電力はノズル本体１が次に述
べる動作に適合するように制御される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plastic injection molding nozzle according to the present invention will be described in more detail with reference to the drawings. FIG. 1 is a sectional view of an embodiment of a nozzle for a plastic injection mold according to the present invention. The nozzle body 1 is made of steel and has a resin passage formed inside. The base of the nozzle body 1 is screwed to the mounting portion 8 kept at high temperature. The end of the nozzle body 1 is conical, and the cylindrical portion at the tip is brought into contact with the mold 6. An injection hole 1a is provided at the center of the cylindrical portion. Sleeve 4
Is made of beryllium copper, which has a high thermal conductivity.
Most of the inner diameter of the sleeve 4 is slightly larger than the outer shape of the nozzle body 1. The inner diameter of the sleeve 4 is mechanically and thermally coupled to the outer shape of the cylindrical portion at the tip of the nozzle body 1. At this time, between the outer diameter of the nozzle body 1 and the inner diameter of the sleeve 4 at most of the heat coupling portion, that is, the cylindrical portion at the tip, the conical portion that is connected to the cylindrical portion, and the large diameter cylindrical portion that is connected to the conical portion. A space 2 is secured in the space. A ring of heat insulating material may be arranged between the inner diameter of the upper end side of the sleeve 4 in the drawing and the outer diameter of the corresponding portion of the nozzle body 1 to ensure a heat insulating space. It is also possible to secure a space by providing projections having a small diameter or a small width on the outer circumference of the nozzle body 1 or the inner circumference of the sleeve so that the projections communicate with each other with extremely large thermal resistance. The heater 3 has a cylindrical shape in which a heating wire wound around the outer shape of the sleeve 4 is covered with an insulating material, and electric power is supplied through an electric wire (not shown). The electric power supplied to the heater 3 is controlled so that the nozzle body 1 conforms to the operation described below.
【０００６】ノズル本体１は十分に高い温度で金型６に
接触させられ瞬時に樹脂を射出する。金型６の温度は低
くかつ熱容量は大きいからノズル本体１の先端部の温度
は急激に下降し射出後、一定時間経過後に先端部内部の
樹脂は固化する。金型６のキャビティ内の成形品の温度
も低下し固化した状態で金型より取り出される。ノズル
本体１が金型から離れるとノズルの先端の熱は奪われな
くなるから温度は急激に上昇する。なおこのようにして
ノズル先端の温度はもとに戻るが流路の温度は殆ど変化
しない。The nozzle body 1 is brought into contact with the mold 6 at a sufficiently high temperature to instantly inject the resin. Since the temperature of the mold 6 is low and the heat capacity is large, the temperature of the tip of the nozzle body 1 drops sharply and the resin inside the tip solidifies after a lapse of a certain time after injection. The temperature of the molded product in the cavity of the mold 6 is also lowered and taken out from the mold in a solidified state. When the nozzle body 1 is separated from the mold, the heat at the tip of the nozzle is not taken away and the temperature rises rapidly. In this way, the temperature at the tip of the nozzle returns to the original temperature, but the temperature in the flow path hardly changes.
【０００７】図２は、前記実施例ノズルの動作例での各
部の温度変化を説明するためのグラフである。このグラ
フは成形用の樹脂としてポリカーボネート樹脂を用いる
場合について示されている。曲線Ａ，ＢおよびＣは図１
中の各Ａ，ＢおよびＣ点の温度変化を示している。すな
わち曲線Ａは、ノズル本体１の先端部の温度変化、曲線
Ｂは、スリーブとヒータの結合部（ヒータの温度に相
当）の変化を示す。曲線Ｃは、ノズルの中腹内壁の温度
すなわちノズル本体内のポリカーボネート樹脂の温度の
変化を示す。またＨの示す曲線はヒータに供給される電
力を示し常時は一定電力が供給されノズル本体１が金型
から離れる時点に瞬時電力が増加される。Ｉｎの示す点
は樹脂の射出時点を示している。この実施例において１
サイクル（射出から射出までの間隔）は約４秒である。
ノズル本体１内、正確にいうとノズル本体１の先端部か
らある程度離れた部分の樹脂の温度は曲線Ｃに示されて
いるように３２０℃に保たれている。これよりも高温に
することは、樹脂の分解による変質を促進するおそれが
あるので好ましくない。金型に接触した瞬間にノズル本
体１の先端部は急速に冷却されてその部分の樹脂は一旦
固まる。樹脂を射出する瞬間は樹脂が溶融している必要
がある。そのために瞬間に溶けるように離型（ノズルブ
レーク）の際先端部に熱を集中させる。前述したように
ノズル中の樹脂の流路の大部分はスリーブ４に直接接触
していないからノズル本体１内の樹脂の温度は曲線Ｃに
示されているようにほぼ３２０℃に保たれている。ノズ
ル先端Ａ点の温度は金型に接触したときに３００℃から
いっきょに２００℃に降下する。樹脂の射出はこの急激
な低下の直前（先端の温度はほぼ３００℃）で瞬時に行
われる。ヒータ３には通常一定の電力が供給されている
が、ノズル先端が型６から離れた瞬間瞬時に電力を増加
させて所定に温度に達したら基の電力に戻す。FIG. 2 is a graph for explaining the temperature change of each part in the operation example of the nozzle of the above embodiment. This graph shows the case where a polycarbonate resin is used as the molding resin. Curves A, B and C are shown in FIG.
The temperature changes at points A, B and C are shown. That is, the curve A shows the temperature change at the tip of the nozzle body 1, and the curve B shows the change at the joint between the sleeve and the heater (corresponding to the temperature of the heater). Curve C shows the change of the temperature of the inner wall of the nozzle, that is, the temperature of the polycarbonate resin in the nozzle body. The curve indicated by H indicates the electric power supplied to the heater, and a constant electric power is always supplied, and the instantaneous electric power is increased when the nozzle body 1 separates from the mold. The point indicated by In indicates the injection point of the resin. 1 in this example
The cycle (interval between injections) is about 4 seconds.
The temperature of the resin inside the nozzle body 1, to be precise, at a portion distant from the tip of the nozzle body 1 to some extent, is maintained at 320 ° C. as shown by the curve C. It is not preferable to set the temperature higher than this, because deterioration of the resin due to decomposition may be accelerated. At the moment of contact with the mold, the tip of the nozzle body 1 is rapidly cooled and the resin in that portion is once solidified. The resin needs to be melted at the moment of injecting the resin. Therefore, heat is concentrated on the tip of the mold when releasing (nozzle break) so that it melts instantly. As described above, most of the resin flow path in the nozzle is not in direct contact with the sleeve 4, so the temperature of the resin in the nozzle body 1 is maintained at approximately 320 ° C. as shown by the curve C. . The temperature at the point A of the nozzle tip drops from 300 ° C to 200 ° C all at once when it contacts the mold. Injection of the resin is instantaneously performed immediately before this rapid decrease (the temperature at the tip is approximately 300 ° C.). The heater 3 is usually supplied with a constant electric power, but the electric power is increased at the moment when the tip of the nozzle leaves the mold 6, and when the temperature reaches a predetermined temperature, the electric power is returned to the original electric power.
【０００８】以上詳しく説明した実施例の構造、工程に
ついては本発明の範囲内で種々の変形を施すことができ
る。例えば前記ノズルと金型の離接の有無またはそのタ
イミング、成形のサイクル周波数等は使用目的に応じて
種々変更が可能である。スリーブ４は上記機能を保ちな
がら、ノズル本体１の先端を被い直接金型６に接しても
同じである。The structure and process of the embodiment described in detail above can be modified in various ways within the scope of the present invention. For example, the presence / absence of the contact / separation of the nozzle and the mold, the timing thereof, the molding cycle frequency, and the like can be variously changed according to the purpose of use. The sleeve 4 has the same function as the sleeve 4 while directly contacting the die 6 by covering the tip of the nozzle body 1 while maintaining the above function.
【０００９】[0009]
【発明の効果】以上詳しく説明したように、本発明によ
るプラスチック射出成形金型用ノズルは、ノズル本体は
熱良伝導体材料からなるスリーブと、前記スリーブの外
周に熱的に接続されているヒータから構成されている。
ヒータの発生した熱はスリーブを介してノズルの先端外
周に集中的に印加されるから、ノズル内部の樹脂流動通
路のプラスチック樹脂温度に殆ど影響を与えないでノズ
ル先端部の温度を任意に制御できる。As described in detail above, in the nozzle for a plastic injection mold according to the present invention, the nozzle body is made of a sleeve made of a good heat conductive material, and a heater thermally connected to the outer circumference of the sleeve. It consists of
Since the heat generated by the heater is concentratedly applied to the outer periphery of the nozzle tip through the sleeve, the temperature of the nozzle tip can be controlled arbitrarily without affecting the plastic resin temperature in the resin flow passage inside the nozzle. .
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明によるプラスチック射出成形金型用ノズ
ルの実施例の断面図である。FIG. 1 is a sectional view of an embodiment of a nozzle for a plastic injection mold according to the present invention.
【図２】前記実施例ノズルの動作例を説明するためのグ
ラフである。FIG. 2 is a graph for explaining an operation example of the nozzle of the embodiment.
１…ノズル本体 ２…空隙 ３…ヒータ ４…スリーブ ５…スリーブとノズル本体先端部との接触部 ６…金型 ７…金型とノズル先端の接触面 ８…高温部のノズル結合金具 ９…樹脂流動通路 １０…金型内樹脂流動通路 DESCRIPTION OF SYMBOLS 1 ... Nozzle body 2 ... Void 3 ... Heater 4 ... Sleeve 5 ... Contact part between sleeve and nozzle body tip part 6 ... Mold 7 ... Contact surface between mold and nozzle tip 8 ... High temperature part nozzle coupling fitting 9 ... Resin Flow passage 10 ... Resin flow passage in mold
Claims (1)
される高温の溶融樹脂を金型に接続するノズル本体と、 前記ノズル本体の前記一端側で熱的かつ機械的に前記ノ
ズルに結合させられ前記ノズル本体の他端方向に空隙も
しくは熱の不良導体を介して被せられている熱良伝導体
材料からなるスリーブと、 前記スリーブの外周に熱的に接続されているヒータから
構成されたプラスチック射出成形金型用ノズル。1. A nozzle body which contacts a molding die at one end and connects a high temperature molten resin supplied from the other end to the die, and the one end side of the nozzle body thermally and mechanically A sleeve made of a good thermal conductor material that is coupled to the nozzle and is covered in the other end direction of the nozzle body through a gap or a poor heat conductor; and a heater that is thermally connected to the outer circumference of the sleeve. Nozzle for configured plastic injection mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5263130A JP2537133B2 (en) | 1993-09-28 | 1993-09-28 | Nozzle for plastic injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5263130A JP2537133B2 (en) | 1993-09-28 | 1993-09-28 | Nozzle for plastic injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0788895A JPH0788895A (en) | 1995-04-04 |
| JP2537133B2 true JP2537133B2 (en) | 1996-09-25 |
Family
ID=17385237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5263130A Expired - Fee Related JP2537133B2 (en) | 1993-09-28 | 1993-09-28 | Nozzle for plastic injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2537133B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030048267A (en) * | 2001-12-11 | 2003-06-19 | 유도실업주식회사 | Anfi solidify device for injectior molding machine |
| RU2008146077A (en) * | 2006-04-24 | 2010-05-27 | Воластик Ко. Лимитед (Th) | PRESSURE CASTING NOZZLE AND TIP FOR HER |
-
1993
- 1993-09-28 JP JP5263130A patent/JP2537133B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0788895A (en) | 1995-04-04 |
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