JP3236748B2 - Screw for injection molding of thermosetting resin - Google Patents
Screw for injection molding of thermosetting resinInfo
- Publication number
- JP3236748B2 JP3236748B2 JP33407494A JP33407494A JP3236748B2 JP 3236748 B2 JP3236748 B2 JP 3236748B2 JP 33407494 A JP33407494 A JP 33407494A JP 33407494 A JP33407494 A JP 33407494A JP 3236748 B2 JP3236748 B2 JP 3236748B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- flight
- resin
- sub
- injection molding
- 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
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】熱硬化性樹脂に使用する射出成形
機のスクリュであって、先端部に副フライトを持つタイ
プに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw for an injection molding machine used for a thermosetting resin, which has a sub-flight at the tip.
【０００２】[0002]
【従来の技術】熱硬化性樹脂（以後樹脂と呼ぶ）は硬化
前は比較的低分子量の物質で、加熱により流動性を示す
が加熱を継続すると熱の作用によって化学反応を起こ
し、不溶不融性の硬化樹脂に変化し、一旦硬化した樹脂
に再び流動性を与えることはできない。従って成形加工
は樹脂が流動性を失う前に行う必要がある。2. Description of the Related Art A thermosetting resin (hereinafter referred to as a resin) is a substance having a relatively low molecular weight before curing and exhibits fluidity by heating. It cannot be changed to a hardened resin and the once hardened resin can be given fluidity again. Therefore, the molding process needs to be performed before the resin loses its fluidity.
【０００３】圧縮比を持ったスクリュを使用すると樹脂
が加熱筒のほぼ中央付近にあるスクリュの圧縮域で剪断
発熱し、それがスクリュ先端迄移送され射出する間に硬
化し易く、これをを防ぐため一般に標準的なスクリュで
は大きな圧縮比を付けない。また滞留や固化した際の排
出を考えて逆流防止弁も付けることをしない。前記の標
準的なスクリュを使用すれば加熱筒内で硬化してしまっ
た樹脂を排出するにはスクリュのねじ溝形状がほぼ一定
なので、加熱筒ヘッド（図３の番号２４）を外し、スク
リュを回転させるだけで可能である。When a screw having a compression ratio is used, the resin generates shear heat in the compression region of the screw near the center of the heating tube, and the resin is easily hardened while being transferred to the screw tip and ejected, thereby preventing this. Therefore, a standard screw does not generally provide a large compression ratio. In addition, a check valve is not provided in consideration of discharge at the time of stagnation or solidification. If the above standard screw is used, the screw groove shape of the screw is almost constant in order to discharge the resin that has hardened in the heating cylinder. Therefore, the heating cylinder head (number 24 in FIG. 3) is removed, and the screw is removed. It is possible just by rotating.
【０００４】そのため図５のように圧縮比１〜１．１で
主フライト１１が形成するねじ溝１３の形状が殆ど変化
しないスクリュ１を用い、逆流防止弁は使用せずに加熱
筒内で樹脂の硬化や滞留が起きないようにしている。そ
して硬化してしまった樹脂は排出できるようように配慮
している。For this reason, as shown in FIG. 5, a screw 1 having a compression ratio of 1 to 1.1 and a shape of a thread groove 13 formed by a main flight 11 hardly changes is used. To prevent hardening and stagnation of Care is taken so that the cured resin can be discharged.
【０００５】[0005]
【発明が解決しようとする課題】こうした標準的なスク
リュを使用しているため成形に於いては樹脂の混練効果
が少なく、未可塑の部分を含んだまま成形され不良とな
ったり、ゲート詰まりを起こしたりするトラブルが多
い。また逆流防止弁を持たないために最近のエポキシ樹
脂のような低粘性樹脂の成形では逆流が多くなり、成形
品重量のバラツキが多くなる等の問題があった。Since such a standard screw is used, the kneading effect of the resin is small in the molding, and the molding is performed while including the unplasticized portion, resulting in failure or gate clogging. There are many troubles to cause. Further, since there is no backflow prevention valve, there is a problem that the backflow is increased in recent molding of a low-viscosity resin such as an epoxy resin, and the weight of the molded article is increased.
【０００６】[0006]
【課題を解決するための手段】標準的なスクリュによる
熱硬化性射出成形の加熱筒温度設定は、ノズル側の高温
部とホッパ側の低温部の２つのゾーンにより設定し、こ
の低温部の未可塑部分で樹脂の逆流を食い止めている。
そして樹脂の溶融は標準的なスクリュの場合先端から主
フライトで３山程度の位置から始まるのが現状であり、
溶融した樹脂は固化しないうちに直ちに射出できるよう
になっている。従ってスクリュ先端の上記溶融の位置に
主フライトのリード角より大きいリード角を持つ副フラ
イトを併設し、該副フライトの両端は主フライトに接続
し、且つ副フライトの高さは主フライトより低くした。
但しリード角はｔａｎθ＝リード／（π×直径）で定義
される角度をいう。The heating cylinder temperature for thermosetting injection molding with a standard screw is set by two zones, a high temperature part on the nozzle side and a low temperature part on the hopper side. The plastic part prevents the resin from flowing backward.
In the case of standard screws, the melting of the resin starts from about three peaks in the main flight from the tip in the current situation.
The molten resin can be injected immediately before it is solidified. Therefore, a sub-flight having a lead angle larger than the main flight lead angle is provided at the above-mentioned melting position of the screw tip, both ends of the sub-flight are connected to the main flight, and the height of the sub-flight is made lower than the main flight. .
However, the lead angle refers to an angle defined by tan θ = lead / (π × diameter).
【０００７】スクリュ基部に供給された樹脂は主フライ
トにて構成されるねじ溝に沿って移送され、先端部まで
来て溶融されると同時に副フライトにて堰止められ、該
副フライトを乗り越えて新たな溝に流入しなければなら
ず、スクリュにより回転しながら副フライトと加熱筒の
隙間を通過し、この時の絞り効果により剪断力を加えら
れ、未溶融部は溶けて混練され均一な可塑化が行われ
る。剪断発熱により樹脂の硬化が促進されるがスクリュ
先端部であり硬化迄の時間内に余裕を持って射出でき
る。[0007] The resin supplied to the screw base is transferred along the thread groove formed by the main flight, comes to the tip and is melted, and at the same time, is blocked by the sub-flight and gets over the sub-flight. It must flow into a new groove, pass through the gap between the sub-flight and the heating cylinder while rotating with a screw, and shearing force is applied by the drawing effect at this time, the unmelted part is melted and kneaded and uniform plasticity Is performed. The curing of the resin is accelerated by the heat generated by the shearing, but the resin is at the tip of the screw and can be injected with a margin before the curing.
【０００８】しかし副フライトを設けたため過って加熱
筒内で硬化してしまった樹脂は加熱筒ヘッドを外すのみ
では排出できず、硬化樹脂を排出する対策として加熱筒
を２つに分け、先端部の加熱筒を取り外せば副フライト
が露出する構造にし、硬化樹脂の排出や滞留樹脂の掃除
等ができる構造としている。However, the resin hardened in the heating cylinder due to the provision of the auxiliary flight cannot be discharged only by removing the heating cylinder head. As a measure for discharging the cured resin, the heating cylinder is divided into two parts. The structure is such that the sub-flight is exposed by removing the heating cylinder of the section, so that the cured resin can be discharged and the accumulated resin can be cleaned.
【０００９】[0009]
【作用】スクリュ先端部の主フライトで３山程度の間に
副フライトを設けたので樹脂の均一可塑化を行うことに
より成形品の品質が向上した。また副フライトによりス
クリュ先端部で樹脂通路が絞られるため樹脂の逆流防止
が期待でき、成形品重量のバラツキの防止にも効果を発
揮する。[Function] Since a sub-flight is provided between about three peaks in the main flight at the tip of the screw, the quality of the molded product is improved by performing uniform plasticization of the resin. In addition, since the resin passage is narrowed at the screw tip by the auxiliary flight, it is possible to prevent the resin from flowing backward, and it is also effective in preventing the variation in the weight of the molded product.
【００１０】[0010]
【実施例】図１は先端部に副フライトを設けた圧縮比１
〜１．１で直径３６〜４５ｍｍのスクリュでリード３０
〜３６ｍｍである。全体にわたって主フライト１１が設
けてあり、先端部の主フライト１１で３山程度に副フラ
イト１２が併設してある。図２は副フライト１２の詳細
図である。主フライト１１のリード角をαとすると副フ
ライト１２のリード角はそれより大きいβであり、副フ
ライト１２は主フライト１１より高さの差Ｔ＝０．４〜
０．７ｍｍだけ低くしてある。該副フライト１２を併設
したことによりねじ溝１３は先端部１５付近にきて２分
割され、今までの溝１３が消滅すると共に新たな溝２７
がノズル２５へ続いている。FIG. 1 shows a compression ratio of 1 with a sub-flight at the tip.
Lead 1.1 with a screw of 36 to 45 mm in diameter at 1.1
３６36 mm. A main flight 11 is provided over the entirety, and a sub-flight 12 is provided at about three peaks of the main flight 11 at the tip. FIG. 2 is a detailed view of the sub flight 12. Assuming that the lead angle of the main flight 11 is α, the lead angle of the sub flight 12 is β which is larger than that.
It is lowered by 0.7 mm. By providing the auxiliary flight 12, the thread groove 13 is divided into two near the tip end portion 15, and the existing groove 13 disappears and a new groove 27 is formed.
Continue to the nozzle 25.
【００１１】一般に成形用の熱硬化性樹脂は粉体状をし
ており、ホッパから基部１４付近に供給された樹脂は主
フライト１１が構成するねじ溝１３中を先端方向に移送
され、加熱筒から熱を供給されスクリュ１０の先端部１
５でやっと可塑化を始めるが、同時に主フライト１１の
ねじ溝１３は副フライト１２で阻止され行き止まりにな
る。溶融したばかりの樹脂は副フライト１２を乗り越え
加熱筒との隙間Ｔを剪断力を受けながら通過し、新たな
溝２７に流入する。樹脂はそのとき受ける剪断力で発熱
し未可塑部分が溶融すると共に混練を受け均一に可塑化
される。In general, the thermosetting resin for molding is in the form of powder, and the resin supplied from the hopper to the vicinity of the base 14 is transported in the screw groove 13 formed by the main flight 11 in the tip direction, and is heated. From the tip of the screw 10
5, plasticization starts at the same time, but at the same time, the thread groove 13 of the main flight 11 is blocked by the sub flight 12 and reaches a dead end. The resin just melted passes over the sub-flight 12 and passes through the gap T with the heating cylinder while receiving a shearing force, and flows into the new groove 27. The resin generates heat due to the shearing force received at that time, and the unplasticized portion is melted and kneaded to be uniformly plasticized.
【００１２】副フライトを通過した樹脂は剪断発熱によ
る化学反応の活発化により硬化が早まるものの、その場
所がスクリュ１０の先端部１５であるため短時間の内に
金型内に射出され、加熱筒内で硬化することは無い。Although the resin that has passed through the sub-flight accelerates its curing due to the activation of the chemical reaction due to the heat generated by shearing, the resin is injected into the mold within a short time because the location is the tip 15 of the screw 10, and the resin is heated. It does not cure inside.
【００１３】図３は２つ割り加熱筒の説明図である。加
熱筒１６を１６ａ，１６ｂの２つに分け、各々の端部外
周にねじ１７，１７を旋削し、端部内径部にインロー合
わせ１９を加工して芯出しすると共にねじ１７，１７に
フランジ１８ａ，１８ｂを螺合し、ボルト２０にて該フ
ランジ同士を締結している。フランジ１８ｂの締結用ボ
ルト２０に干渉しない位置にジャッキ用タップ２１が３
箇所等間隔で設けてある。また加熱筒１６外周に温調用
媒体を通す溝２２が加工され、その外周をカバー２３に
て覆っている。加熱筒１６ｂの先端に加熱筒ヘッド２４
とノズル２５が螺合されている。FIG. 3 is an explanatory diagram of a split heating cylinder. The heating cylinder 16 is divided into two parts 16a and 16b. Screws 17 and 17 are turned around the outer periphery of each end, and a centering is performed by machining a spigot joint 19 on the inner diameter of the end. , 18b are screwed together, and the flanges are fastened with bolts 20. 3 jack taps 21 are located on the flange 18b so as not to interfere with the fastening bolts 20.
They are provided at regular intervals. A groove 22 for passing a temperature control medium is formed on the outer periphery of the heating cylinder 16, and the outer periphery is covered with a cover 23. A heating cylinder head 24 is provided at the end of the heating cylinder 16b.
And the nozzle 25 are screwed.
【００１４】硬化してしまった樹脂を排出するには、図
４のように加熱筒１６ｂをフランジ１８部分から分離し
取り外し、スクリュ１０の先端部１５を露出させる。若
し固着して抜けなければ前記のタップ２１に締結用ボル
ト２０をねじ込み引き離す事が可能である。この作業に
より先端部１５の副フライト１２が露出し、溝間の硬化
した樹脂の掃除ができると共に図の様に加熱筒１６ａ内
部の樹脂２６はスクリュの回転及び往復動により排出で
きる。In order to discharge the hardened resin, the heating cylinder 16b is separated from the flange 18 and removed as shown in FIG. 4, and the tip 15 of the screw 10 is exposed. If it does not come off and is fixed, the fastening bolt 20 can be screwed into the tap 21 and pulled apart. By this operation, the sub-flight 12 at the distal end portion 15 is exposed, the cured resin between the grooves can be cleaned, and the resin 26 inside the heating cylinder 16a can be discharged by the rotation and reciprocation of the screw as shown in the figure.
【００１５】[0015]
【発明の効果】スクリュ先端部１５に主フライトに併せ
て副フライトを設けたことにより樹脂に未可塑部分が無
くなり成形品の不良率の減少が期待できる。また低粘性
樹脂の射出成形に於いても射出時の逆流防止の効果が期
待でき、成形品重量のバラツキを押さえる事ができる。
このため半導体チップの封止など精密成形に使用でき効
果が大きい。By providing a sub-flight in addition to the main flight at the screw tip portion 15, the resin has no unplasticized portion, and a reduction in the defective rate of the molded product can be expected. Also, in the injection molding of a low-viscosity resin, the effect of preventing backflow at the time of injection can be expected, and the variation in the weight of molded products can be suppressed.
Therefore, it can be used for precision molding such as sealing of a semiconductor chip, and the effect is large.
【図１】本発明に係る副フライトを設けた熱硬化性樹脂
の射出成形用スクリュFIG. 1 shows a screw for injection molding of a thermosetting resin provided with a sub-flight according to the present invention.
【図２】スクリュの副フライト部詳細図FIG. 2 is a detailed view of the sub flight section of the screw.
【図３】分割型加熱筒の詳細図FIG. 3 is a detailed view of a split-type heating cylinder.
【図４】分割型加熱筒の先端部分を外して硬化樹脂を排
出する様子を示す図FIG. 4 is a view showing a state in which a distal end portion of a split-type heating cylinder is removed and a cured resin is discharged.
【図５】標準の熱硬化性樹脂の射出成形用スクリュFIG. 5: Screw for injection molding of standard thermosetting resin
１ 標準の熱硬化性樹脂の射出成形用スクリュ １０ 副フライトを設けた熱硬化性樹脂の射出成形用ス
クリュ １１ 主フライト １２ 副フライト １３ ねじ溝 １４ 基部 １５ 先端部 １６ 加熱筒 １８ フランジ １９ インロー合わせ ２７ 新たな溝DESCRIPTION OF SYMBOLS 1 Standard screw for injection molding of thermosetting resin 10 Screw for injection molding of thermosetting resin provided with sub-flight 11 Main flight 12 Sub-flight 13 Screw groove 14 Base 15 Front end 16 Heating cylinder 18 Flange 19 Inlay fitting 27 New groove
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−25424（ＪＰ，Ａ) 実開 平３−31528（ＪＰ，Ｕ) 特公 平４−77611（ＪＰ，Ｂ２) 大柳 康 監修，エンジニアリングプ ラスチックの最新成形・加工技術，株式 会社シーエムシー，1987年12月 ４日, ｐ247−249 (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 B29C 45/46 - 45/63 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-25424 (JP, A) JP-A-3-31528 (JP, U) JP-B4-77611 (JP, B2) Supervised by Yasushi Oyanagi, Engineering Plastics latest molding and processing technology, CMC Co., Ltd., December 4, 1987, pp. 247-249 (58) Fields investigated (Int. Cl. 7 , DB name) B29C 45/00 B29C 45/46-45 / 63
Claims (1)
れ、基部に供給された原料樹脂を可塑化し、射出する熱
硬化性樹脂の射出成形用スクリュであって、 圧縮比１〜１．１の主フライトからなり、先端部の主フ
ライト３山程度に該主フライトのリード角より大きいリ
ード角を持つ副フライトを併設し、該副フライトの両端
は主フライトに接続し、且つ副フライトの高さは主フラ
イトより低くしたことを特徴とする熱硬化性樹脂の射出
成形用スクリュ。1. A screw for injection molding of a thermosetting resin which is rotatably and reciprocally inserted into a heating cylinder, plasticizes and injects a raw material resin supplied to a base, and has a compression ratio of 1 to 1. Sub-flights having a lead angle larger than the lead angle of the main flight are provided at about three main flights at the tip end, and both ends of the sub-flight are connected to the main flight, and Injection molding screw for thermosetting resin, characterized in that its height is lower than the main flight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33407494A JP3236748B2 (en) | 1994-12-15 | 1994-12-15 | Screw for injection molding of thermosetting resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33407494A JP3236748B2 (en) | 1994-12-15 | 1994-12-15 | Screw for injection molding of thermosetting resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08207099A JPH08207099A (en) | 1996-08-13 |
| JP3236748B2 true JP3236748B2 (en) | 2001-12-10 |
Family
ID=18273227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33407494A Expired - Fee Related JP3236748B2 (en) | 1994-12-15 | 1994-12-15 | Screw for injection molding of thermosetting resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3236748B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6888483B2 (en) * | 2017-08-29 | 2021-06-16 | 宇部興産機械株式会社 | Screw for injection molding machine and injection molding method |
-
1994
- 1994-12-15 JP JP33407494A patent/JP3236748B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 大柳 康 監修，エンジニアリングプラスチックの最新成形・加工技術，株式会社シーエムシー，１９８７年１２月 ４日，ｐ２４７−２４９ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08207099A (en) | 1996-08-13 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |