JPH0324930A - Nozzle apparatus for injection molding - Google Patents
Nozzle apparatus for injection moldingInfo
- Publication number
- JPH0324930A JPH0324930A JP16046689A JP16046689A JPH0324930A JP H0324930 A JPH0324930 A JP H0324930A JP 16046689 A JP16046689 A JP 16046689A JP 16046689 A JP16046689 A JP 16046689A JP H0324930 A JPH0324930 A JP H0324930A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- nozzle
- differential pressure
- pressure piston
- valve
- 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
- 238000001746 injection moulding Methods 0.000 title claims description 7
- 229920005989 resin Polymers 0.000 claims abstract description 80
- 239000011347 resin Substances 0.000 claims abstract description 80
- 238000002347 injection Methods 0.000 claims abstract description 61
- 239000007924 injection Substances 0.000 claims abstract description 61
- 239000012530 fluid Substances 0.000 claims abstract description 43
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000007906 compression Methods 0.000 claims abstract description 9
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 5
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 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
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/234—Valves opened by the pressure of the moulding material
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
- B29C45/1735—Nozzles for introducing the fluid through the mould gate, e.g. incorporated in the injection nozzle
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding 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、溶融した合威樹脂と流体を金型に注入し、合
或樹脂の中空型物等を射出戒形するノズル装置に関する
。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a nozzle device for injecting molten synthetic resin and fluid into a mold and injecting a hollow molded object of the synthetic resin.
（従来の技術）
従来より、合戒樹脂の中空型物等を威形する射出戒形法
の技術として、例えば、特公昭５９−４９９０２号公報
に記載のように、加熱溶融した合戊樹脂（以下「溶融樹
脂」という）を金型内に注入し、しかるのち、ガス体の
み、或いはガス体と溶融樹脂とを圧入して金型のキャビ
ティーを満たすことによって中空型物を成形するガス注
入射出戒形法が知られている。(Prior Art) Conventionally, as a technique of injection molding method for shaping hollow molded objects etc. of synthetic resin, heat-melted synthetic resin ( Gas injection involves injecting molten resin (hereinafter referred to as "molten resin") into a mold, and then press-fitting only the gas body or the gas body and the molten resin to fill the cavity of the mold to form a hollow molded object. The ejaculation method is known.
上記ガス注入射出成形法において、第４図に示すような
ノズル装ｆｌａが用いられている。このノズル装ｉ［ａ
は、射出シリンダーｂの吐出口Ｃに装着され、ノズル装
置ａの先端側のノズル孔ｄを開閉する弁体ｅをノズル本
体ｇ内に有し、ノズル本体ｇと弁体ｅにより樹脂通路ｉ
を形成すると共に弁体ｅ内にガス等の流体注入通路ｆを
設けたもので、ノズル装置ａの先端部が図示しない金型
の注入口に係合されると、ノズル孔ｄを介して金型内に
溶融樹脂を注入し、弁体ｅによりノズル孔ｄを閉弁して
樹脂通路ｉを遮断し、ガス等の流体を流体注入通路ｆか
ら金型のキャビテイーに充填された樹脂内に注入するよ
うになっている。In the gas injection injection molding method described above, a nozzle arrangement fla as shown in FIG. 4 is used. This nozzle arrangement i[a
has a valve body e in the nozzle body g that is attached to the discharge port C of the injection cylinder b and opens and closes the nozzle hole d on the tip side of the nozzle device a, and the nozzle body g and the valve body e open the resin passage i.
and a fluid injection passage f for gas etc. is provided in the valve body e. When the tip of the nozzle device a is engaged with the injection port of the mold (not shown), the metal is injected through the nozzle hole d. Molten resin is injected into the mold, the nozzle hole d is closed by the valve body e to block the resin passage i, and fluid such as gas is injected into the resin filled in the cavity of the mold from the fluid injection passage f. It is supposed to be done.
（発明が解決しようとする課Ｂ）
しかしながら、上記従来技術のような射出戒形用ノズル
装置においては、常温に近いガス等の流体を注入すると
、弁体ｅが冷却され弁体ｅとノズル本体ｇの間にある樹
脂が固化し、ノズル先端部の樹脂通路ｉが閉塞された状
態となり、射出シリンダーｂから溶融樹脂の吐出圧を増
大しても流動せず内圧によりノズル装置が破損する恐れ
があった。(Problem B to be Solved by the Invention) However, in the injection nozzle device of the prior art described above, when fluid such as gas close to room temperature is injected, the valve body e is cooled and the valve body e and the nozzle body are injected. The resin between g solidifies and the resin passage i at the nozzle tip becomes blocked, and even if the discharge pressure of the molten resin from the injection cylinder b is increased, it will not flow and the nozzle device may be damaged by the internal pressure. there were.
本発明は、上記問題点を解決するためになされたもので
、その目的とするところは、ノズル先端部で樹脂が固化
して詰まることのないガス注入或形が可能な射出戒形用
ノズル装置を提供することにある。The present invention has been made to solve the above problems, and its purpose is to provide a nozzle device for injection molding that allows gas injection and molding without clogging due to solidification of resin at the tip of the nozzle. Our goal is to provide the following.
（課題を解決するための手段）
本発明射出戒形用ノズル装置は、後端に樹脂導入口を備
え、前端に金型の注入口に係合するノズル孔を備えたノ
ズルシリンダーと、該ノズルシリンダー内に前後方向に
摺動自在に設けられ、後部に樹脂導入口を開閉する弁を
有した差圧ピストンと、射出シリンダー内の樹脂圧力が
所定値に達するまで差圧ピストンの弁を樹脂導入口で閉
弁保持するべく押圧する圧縮バネとからなり、前記差圧
ピストンには、その略中央部に前後方向に貫通した溶融
樹脂通路と、該溶融樹脂通路の後方に差圧ピストンの弁
が開弁のときノズルシリンダー内に形成される後部空洞
部に連通ずる流入口と、前方にノズル孔に連通ずる流出
口とを設けると共に、前記ノズルシリンダーには、差圧
ピストンの弁が閉弁のときノズルシリンダー内に形成さ
れる前部空洞部に連通ずる流体注入通路を設けたことを
特徴とするものである．
本発明に用いられる合或樹脂は、一般の射出或形あるい
は押出し戒形に使用される熱可塑性樹脂であるが、必要
に応じて熱硬化性樹脂も使用できる。(Means for Solving the Problems) The nozzle device for injection molding according to the present invention includes a nozzle cylinder equipped with a resin inlet at the rear end and a nozzle hole that engages with the injection port of the mold at the front end, and the nozzle. A differential pressure piston is installed inside the cylinder so that it can slide forward and backward, and has a valve at the rear that opens and closes the resin inlet, and the valve of the differential pressure piston is used to introduce resin until the resin pressure in the injection cylinder reaches a predetermined value. The differential pressure piston has a molten resin passage that penetrates in the front-rear direction approximately in the center thereof, and a valve of the differential pressure piston behind the molten resin passage. The nozzle cylinder is provided with an inlet that communicates with the rear cavity formed in the nozzle cylinder when the valve is open, and an outlet that communicates with the nozzle hole at the front. This is characterized by a fluid injection passage communicating with the front cavity formed within the nozzle cylinder. The resin used in the present invention is a thermoplastic resin used in general injection molding or extrusion molding, but a thermosetting resin can also be used if necessary.
また、本発明で用いられる流体としては、例えば、窒素
ガス、炭酸ガス、空気等の常温でガス状の物質となり得
るものが好適に使用されるが、液状の発泡剤等であって
もよい。Further, as the fluid used in the present invention, for example, a fluid that can be a gaseous substance at room temperature such as nitrogen gas, carbon dioxide gas, or air is suitably used, but a liquid blowing agent or the like may also be used.
（作用）
本発明射出戒形用ノズル装置は上記した構戒により、射
出シリンダー内の溶融樹脂が所定値の樹脂圧力になる前
は、圧縮バネによって差圧ピストンは樹脂導入口の方向
に押圧されて、差圧ピストンの弁が樹脂導入口を閉塞し
ている．この閉弁状態によって射出シリンダーとノズル
装置の溶融樹脂通路とは連通を断っている。一方、この
位置における差圧ピストンと流体注入通路の関係は、差
圧ピストンの前端がノズル孔からはなれて前部空洞部を
形成した位置にあり、流体注入通路は前部空洞部を介し
てノズル孔に連通している。即ち、流体注入通路は開と
なって流体を前部空洞部に注入することができる。(Function) Due to the above-mentioned structure of the injection nozzle device of the present invention, the differential pressure piston is pressed in the direction of the resin inlet by the compression spring before the molten resin in the injection cylinder reaches a predetermined resin pressure. Therefore, the valve of the differential pressure piston is blocking the resin inlet. With this valve closed, communication between the injection cylinder and the molten resin passage of the nozzle device is cut off. On the other hand, the relationship between the differential pressure piston and the fluid injection passage in this position is that the front end of the differential pressure piston is separated from the nozzle hole to form a front cavity, and the fluid injection passage is connected to the nozzle through the front cavity. It communicates with the hole. That is, the fluid injection passage is open to allow fluid to be injected into the anterior cavity.
また、射出シリンダー内の溶融樹脂が所定値の樹脂圧力
になると、この樹脂圧力によって差圧ピストンが圧縮バ
ネに抗してノズル孔側に前進し、弁が樹脂導入口から離
れて後部空洞部を形成した状態にある。この状態におい
ては、樹脂導入口は開で流体注入通路は閉となり、射出
シリンダー内の溶融樹脂が後部空洞部に流入し差圧ピス
トンの流入口から溶融樹脂通路を通ってノズル孔に流出
する．このように、樹脂導入口と流体注入通路は差圧ピ
ストンによって交互に開閉され、流体注入通路を通過す
る流体が差圧ピストン内の樹脂通路の溶融樹脂を冷却固
化することなく、金型内に注入される。When the molten resin in the injection cylinder reaches a predetermined resin pressure, the differential pressure piston moves forward toward the nozzle hole against the compression spring, and the valve moves away from the resin inlet and opens the rear cavity. It is in a formed state. In this state, the resin inlet is open and the fluid injection passage is closed, and the molten resin in the injection cylinder flows into the rear cavity and flows out from the inlet of the differential pressure piston, through the molten resin passage, and into the nozzle hole. In this way, the resin inlet and the fluid injection passage are alternately opened and closed by the differential pressure piston, and the fluid passing through the fluid injection passage cools and solidifies the molten resin in the resin passage inside the differential pressure piston, allowing it to flow into the mold. Injected.
（実施例）
本発明射出戒形用ノズル装置の実施例を図面を参照しな
がら説明する。(Embodiment) An embodiment of the injection nozzle device of the present invention will be described with reference to the drawings.
第１図において、１は射出シリンダー、２は溶融樹脂の
射出を行うスクリュー、３は後端が射出シリンダー１の
吐出口４に装着され、前端が図示しない金型の注入口に
係合するノズル装置である．ノズル装置３は、後端に樹
脂導入口５を備え、前端にノズル孔６を備えたノズルシ
リンダー７と、該ノズルシリンダー７内に前後方向に摺
動自在に設けられ、後部に樹脂導入口５を開閉する弁８
を有した差圧ピストン９と、樹脂圧力が所定値に達する
まで差圧ピストン９の弁８を樹脂導入口５で閉弁保持す
るべく押圧する圧縮バネ１０とから構或されている。In FIG. 1, 1 is an injection cylinder, 2 is a screw for injecting molten resin, and 3 is a nozzle whose rear end is attached to the discharge port 4 of the injection cylinder 1 and whose front end engages with an injection port of a mold (not shown). It is a device. The nozzle device 3 includes a nozzle cylinder 7 equipped with a resin inlet 5 at the rear end and a nozzle hole 6 at the front end, and a nozzle cylinder 7 that is slidably provided in the front and rear directions within the nozzle cylinder 7 and has the resin inlet 5 at the rear. Valve 8 to open and close
The pressure differential piston 9 is composed of a differential pressure piston 9 having a pressure of 1000 .ANG.
ノズルシリンダー７は、射出シリンダーｌの吐出口４に
螺着して取着される取付基部７ｌと、図示しない金型の
注入口に係合するノズル部７２とからなり、取付基部７
１の内部には樹脂導入口５を開閉する差圧ピストン９の
弁８を摺動自在に挿入すると共に、弁８を樹脂導入口５
に押圧する圧縮バネ１０を取付基部７１の内周面と差圧
ピストン９の外周面との間の空隙部７３に挿着して、取
付基部７Ｉからはみ出した部分の差圧ピストン９をノズ
ル部７２内に挿入し、取付基部７１にノズル部７２を螺
着することにより組み立てられる構造となっている。The nozzle cylinder 7 consists of a mounting base 7l that is screwed and attached to the discharge port 4 of the injection cylinder l, and a nozzle part 72 that engages with an injection port of a mold (not shown).
A valve 8 of a differential pressure piston 9 that opens and closes the resin inlet 5 is slidably inserted into the inside of the resin inlet 5.
A compression spring 10 that presses the pressure is inserted into the gap 73 between the inner circumferential surface of the mounting base 71 and the outer circumferential surface of the differential pressure piston 9, and the portion of the differential pressure piston 9 protruding from the mounting base 7I is inserted into the nozzle portion. 72 and is assembled by screwing the nozzle part 72 onto the mounting base 71.
前記差圧ピストン９には、略中心部に前後方向に貫通し
て溶融樹脂通路１１が設けられ、該溶融樹脂通路１１の
後方に差圧ピストン９の弁８が開弁のときノズルシリン
ダー７の後部空洞部７３ａから流入する複数個の流入口
１２が設けられ、前方にノズル孔６側に向けて流出口１
３が貫通されている。The differential pressure piston 9 is provided with a molten resin passage 11 extending through it in the front-rear direction approximately in the center thereof, and behind the molten resin passage 11, when the valve 8 of the differential pressure piston 9 is open, the nozzle cylinder 7 is opened. A plurality of inlets 12 are provided for inflowing from the rear cavity 73a, and an outlet 1 is provided at the front toward the nozzle hole 6 side.
3 is penetrated.
また、ノズルシリンダー７のノズル部７２には、図示し
ない加圧流体源に接続しているバイプ１４が取付けられ
、該パイブ１４内が流体注入通路工５となされ、更に、
差圧ピストン９の前部にもその外周面から前端面に通じ
る流体注入通路１５ａが設けられている。流体注入通路
ｌ５と１５ａは差圧ピストン９の弁８が閉弁のとき互い
に連通し、また、差圧ピストン９の弁８が開弁のとき流
体注入通路１５は前記差圧ピストン９の前部外周面によ
り閉鎖されるようになっている。Further, a pipe 14 connected to a pressurized fluid source (not shown) is attached to the nozzle portion 72 of the nozzle cylinder 7, and the inside of the pipe 14 serves as a fluid injection passageway 5.
A fluid injection passage 15a communicating from the outer peripheral surface to the front end surface is also provided at the front portion of the differential pressure piston 9. The fluid injection passages l5 and 15a communicate with each other when the valve 8 of the differential pressure piston 9 is closed, and the fluid injection passage 15 communicates with the front part of the differential pressure piston 9 when the valve 8 of the differential pressure piston 9 is open. It is closed by the outer peripheral surface.
次に、上記実施例における射出戒形用ノズル装置の作動
について図面に基づいて説明する．予め、射出シリンダ
ー１内に、溶融樹脂をスクリュー２で可塑化し貯めてお
く。このときの差圧ピストン９の位置関係を第２図（ａ
）に示す．即ち、圧縮バネ１０によって差圧ピストン９
は樹脂導入口５の方向に押圧されており、差圧ピストン
９の弁８が樹脂導入口５を閉塞している。この閉弁状熊
によって射出シリンダー１とノズル装置３の溶融樹脂通
路ｌ１とは連通を断っている。この位置における差圧ピ
ストン９と流体注入通路１５の関係は、差圧ピストン９
の前端がノズル孔６からはなれて前部空洞部Ｔ３ｂを形
戒した位置にあり、流体注入通路１５は流体注入通路１
５ａ、前部空洞部７３ｂを介してノズル孔６に連通して
いる。即ち、流体注入通路は開となっている。Next, the operation of the injection nozzle device in the above embodiment will be explained based on the drawings. In advance, molten resin is plasticized and stored in the injection cylinder 1 using the screw 2. The positional relationship of the differential pressure piston 9 at this time is shown in Figure 2 (a
) is shown. That is, the compression spring 10 causes the differential pressure piston 9
is pressed in the direction of the resin inlet 5, and the valve 8 of the differential pressure piston 9 closes the resin inlet 5. Communication between the injection cylinder 1 and the molten resin passage l1 of the nozzle device 3 is cut off by this closed valve. The relationship between the differential pressure piston 9 and the fluid injection passage 15 in this position is as follows:
The front end of the fluid injection passage 15 is located away from the nozzle hole 6 to define the front cavity T3b, and the fluid injection passage 15
5a, and communicates with the nozzle hole 6 via the front cavity 73b. That is, the fluid injection passage is open.
次に、樹脂を金型内に射出するためスクリュー２によっ
て溶融可塑化した樹脂に所定の射出圧力をかけると、こ
の樹脂圧力によって差圧ピストン９が圧縮バネｔｏに抗
してノズル孔６側に前進する。差圧ピストン９は第２図
（ｂ）に示すように前端がノズルシリンダー７の受面７
４に当接するまで前進すると、前進の途中において流体
注入通路１５は差圧ピストン９の前部外周面の摺動によ
って閉鎖されると共に、弁８が樹脂導入口５から離れて
後部空洞部７３ａが形成された状態となる。Next, when a predetermined injection pressure is applied to the melted and plasticized resin by the screw 2 in order to inject the resin into the mold, this resin pressure causes the differential pressure piston 9 to move toward the nozzle hole 6 against the compression spring to. Advance. The front end of the differential pressure piston 9 is connected to the receiving surface 7 of the nozzle cylinder 7, as shown in FIG. 2(b).
4, the fluid injection passage 15 is closed by sliding of the front outer peripheral surface of the differential pressure piston 9 during the forward movement, and the valve 8 is separated from the resin inlet 5 and the rear cavity 73a is closed. It will be in a formed state.
即ち、この状態においては、樹脂導入口５は開で流体注
入通路１５は閉となり、射出シリンダー１内の溶融樹脂
が後部空洞部７３ａに流入し差圧ピストン９の流入口５
から溶融樹脂通路１１を通ってノズル孔６に流出し、金
型内に射出される。That is, in this state, the resin inlet 5 is open and the fluid injection passage 15 is closed, and the molten resin in the injection cylinder 1 flows into the rear cavity 73a and flows into the inlet 5 of the differential pressure piston 9.
From there, the molten resin flows out through the nozzle hole 6 through the molten resin passage 11 and is injected into the mold.
次に、所定量の樹脂が金型内に射出されると、スクリュ
ー２による樹脂圧力が除かれ、差圧ピストン９は圧縮バ
ネ１０の力によって第２図（ｂ）の状態から第２図（ａ
）の状態に戻り、樹脂導入口５が閉弁され、流体注入通
路１５が開となる。Next, when a predetermined amount of resin is injected into the mold, the resin pressure by the screw 2 is removed, and the differential pressure piston 9 changes from the state shown in FIG. 2(b) to the state shown in FIG. 2(b) by the force of the compression spring 10. a
), the resin introduction port 5 is closed and the fluid injection passage 15 is opened.
このため、加圧流体源からの加圧流体が、差圧ピストン
９の前部に設けられている流体注入通路１５ａから前部
空洞部７３ｂ、ノズル孔６を経て金型のキャビテイーの
樹脂内に注入され、中空型物が或形される。Therefore, the pressurized fluid from the pressurized fluid source flows from the fluid injection passage 15a provided at the front of the differential pressure piston 9 through the front cavity 73b and the nozzle hole 6 into the resin of the mold cavity. The hollow mold is shaped.
尚、上記実施例において、加圧流体の注入通路として差
圧ピストン９の前部に流体注入通路１５ａを設けた例で
説明したが、これに限定するものでなく、例えば、第３
図に示すように、流体注入通路１５は、樹脂導入口５が
閉弁のとき、差圧ピストン９の外周縁９１が流体注入通
路ｌ５の開孔部から外れて直接に前部空洞部７３ｄに連
通し、樹脂導入口５が開弁のとき、差圧ピストン９の外
周面の摺動により閉鎖されるようにしてもよい。In the above embodiment, the example in which the fluid injection passage 15a was provided in the front part of the differential pressure piston 9 as the pressurized fluid injection passage was explained, but the invention is not limited to this.
As shown in the figure, when the resin inlet 5 is closed, the outer peripheral edge 91 of the differential pressure piston 9 comes off the opening of the fluid injection passage 15 and directly enters the front cavity 73d. When the resin inlet port 5 is open, the resin inlet port 5 may be closed by sliding on the outer peripheral surface of the differential pressure piston 9.
（発明の効果）
本発明射出戒形用ノズル装置は、上記の通りの構戒にな
されているので、従来のノズル装置と違って弁体内にガ
ス等の流体注入通路を設けたものではないから、流体注
入に伴って溶融樹脂通路内の樹脂が固化するということ
がなく、樹脂通路が固化した樹脂で詰まり閉塞されると
いうことがない．従って、射出シリンダーから溶融樹脂
の吐出圧を増大しなくても良好な流動状態下で戒形生産
を続けることができ、ノズル装置が破損するという恐れ
もなくなる。(Effects of the Invention) Since the injection nozzle device of the present invention is constructed as described above, unlike conventional nozzle devices, there is no passage for injecting fluid such as gas into the valve body. The resin in the molten resin passage does not solidify when fluid is injected, and the resin passage does not get clogged with solidified resin. Therefore, mold production can be continued under good flow conditions without increasing the discharge pressure of the molten resin from the injection cylinder, and there is no fear that the nozzle device will be damaged.
第１図は本発明射出戒形用ノズル装置の一実施例を示す
縦断面図、第２図（ａ），（ｂ）は差圧ピストンの作動
説明図、第３図は他の実施例を示す縦断面図、第４図は
従来例を説明する射出戒形用ノズル装置の縦断面図であ
る。
符号の説明
１・・射出シリンダー、２・・スクリュー、３・・ノズ
ル装置、４・・吐出口、５・・樹脂導入口、６・・ノズ
ル孔、７・・ノズルシリンダー８・・弁、９・・差圧ピ
ストン、１０・・圧縮バネ、１１・・溶融樹脂通路、ｌ
２・・流入口、１３・・流出口、１５．１５ａ・・流体
注入通路、７３ａ・・後部空洞部、７３ｂ・・前部空洞
部。Fig. 1 is a longitudinal sectional view showing one embodiment of the injection nozzle device of the present invention, Figs. 2(a) and (b) are illustrations of the operation of the differential pressure piston, and Fig. 3 shows another embodiment. FIG. 4 is a longitudinal sectional view of a conventional injection nozzle device. Explanation of symbols 1: Injection cylinder, 2: Screw, 3: Nozzle device, 4: Discharge port, 5: Resin inlet, 6: Nozzle hole, 7: Nozzle cylinder 8: Valve, 9 ... Differential pressure piston, 10... Compression spring, 11... Molten resin passage, l
2...Inlet, 13...Outlet, 15.15a...Fluid injection passage, 73a...Rear cavity, 73b...Front cavity.
Claims (1)
合するノズル孔を備えたノズルシリンダーと、該ノズル
シリンダー内に前後方向に摺動自在に設けられ、後部に
樹脂導入口を開閉する弁を有した差圧ピストンと、射出
シリンダー内の樹脂圧力が所定値に達するまで差圧ピス
トンの弁を樹脂導入口で閉弁保持するべく押圧する圧縮
バネとからなり、前記差圧ピストンには、その略中央部
に前後方向に貫通した溶融樹脂通路と、該溶融樹脂通路
の後方に差圧ピストンの弁が開弁のときノズルシリンダ
ー内に形成される後部空洞部に連通する流入口と、前方
にノズル孔に連通する流出口とを設けると共に、前記ノ
ズルシリンダーには、差圧ピストンの弁が閉弁のときノ
ズルシリンダー内に形成される前部空洞部に連通する流
体注入通路を設けたことを特徴とする射出成形用ノズル
装置。1. A nozzle cylinder equipped with a resin introduction port at the rear end and a nozzle hole that engages with the injection port of the mold at the front end, and a nozzle cylinder provided slidably in the front and rear direction within the nozzle cylinder, and a resin introduction port at the rear end. It consists of a differential pressure piston with a valve that opens and closes the mouth, and a compression spring that presses the valve of the differential pressure piston to keep it closed at the resin inlet until the resin pressure in the injection cylinder reaches a predetermined value. The pressure piston has a molten resin passage that penetrates in the front-rear direction approximately at the center thereof, and a rear cavity portion formed in the nozzle cylinder when the valve of the differential pressure piston is opened at the rear of the molten resin passage. The nozzle cylinder has an inlet and an outlet communicating with the nozzle hole at the front, and the nozzle cylinder has a fluid inlet communicating with the front cavity formed in the nozzle cylinder when the valve of the differential pressure piston is closed. An injection molding nozzle device characterized by having a passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16046689A JPH0324930A (en) | 1989-06-22 | 1989-06-22 | Nozzle apparatus for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16046689A JPH0324930A (en) | 1989-06-22 | 1989-06-22 | Nozzle apparatus for injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0324930A true JPH0324930A (en) | 1991-02-01 |
Family
ID=15715557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16046689A Pending JPH0324930A (en) | 1989-06-22 | 1989-06-22 | Nozzle apparatus for injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0324930A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008296386A (en) * | 2007-05-29 | 2008-12-11 | Japan Steel Works Ltd:The | Injection nozzle for injection molding machine |
| CN108437355A (en) * | 2018-03-22 | 2018-08-24 | 广船国际有限公司 | Automatic glue seal ejection nozzle equipment |
-
1989
- 1989-06-22 JP JP16046689A patent/JPH0324930A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008296386A (en) * | 2007-05-29 | 2008-12-11 | Japan Steel Works Ltd:The | Injection nozzle for injection molding machine |
| JP4745288B2 (en) * | 2007-05-29 | 2011-08-10 | 株式会社日本製鋼所 | Injection nozzle for injection molding machine |
| CN108437355A (en) * | 2018-03-22 | 2018-08-24 | 广船国际有限公司 | Automatic glue seal ejection nozzle equipment |
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