JP3550699B2 - Extruder and method for supplying colorant thereto - Google Patents

Extruder and method for supplying colorant thereto Download PDF

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Publication number
JP3550699B2
JP3550699B2 JP22377093A JP22377093A JP3550699B2 JP 3550699 B2 JP3550699 B2 JP 3550699B2 JP 22377093 A JP22377093 A JP 22377093A JP 22377093 A JP22377093 A JP 22377093A JP 3550699 B2 JP3550699 B2 JP 3550699B2
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Prior art keywords
resin material
colorant
screw cylinder
supply port
synthetic resin
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JPH0776037A (en
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篤 木下
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Sunstar Inc
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Sunstar Inc
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    • 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
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B29C45/1816—Feeding auxiliary material, e.g. colouring 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/297—Feeding the extrusion material to the extruder at several locations, e.g. using several hoppers or using a separate additive feeding

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、成形品を着色するための液状着色剤をスクリューシリンダ内に供給する着色剤供給手段を備えた押出機及び押出機に対する着色剤の供給方法に関する。
【０００２】
【従来の技術】
通常、射出成形装置や押出成形装置などの成形装置は、合成樹脂材料を混練させながら加熱溶融して金型の成形キャビティ内やダイス側へ押し出す押出機を備えている。
ところで、成形装置により着色した成形品を製作する場合には、押出機のスクリューシリンダの後部に形成した樹脂材料供給口からペレット状の合成樹脂材料と濃縮顔料からなる固形のマスターバッチとを所定の割合で供給し、スクリューシリンダ内において両者を混練させながら加熱溶融させることで、着色した成形品を得るように構成してある。
【０００３】
ところが、前記方法により着色した成形品を製作する場合には、固形のマスターバッチを供給するための大型な着色剤供給手段が必要であるとともに、固形のマスターバッチの分散性があまり良くないことから合成樹脂材料とマスターバッチとの混練不良により色むらが発生し易いという問題があった。
そこで、顔料及び又は染料と界面活性剤とからなる液状着色剤を、合成樹脂材料とともに樹脂材料供給口へ供給することで、着色剤供給手段を小型に構成し且つ成形品の色むらを防止する押出機が提案されている。
【０００４】
【発明が解決しようとする課題】
ところが、前記押出機では、液状着色剤を合成樹脂材料とともに樹脂材料供給口へ供給するので、樹脂材料供給口付近においてペレット状の合成樹脂材料に液状着色剤が付着し、合成樹脂材料とスクリュー間にすべりが発生して、合成樹脂材料がスクリューシリンダとスクリュー間に円滑に噛み込まれず、ショットを繰り返すうちに樹脂材料供給口付近に合成樹脂材料が序々に滞留し、１０〜２０時間の連続生産後には滞留した合成樹脂材料で樹脂材料供給口が閉鎖されて合成樹脂材料の供給不良が発生し、計量タイムオーバーにより押出機が停止するという問題があり、連続生産に耐え得る構成ではなかった。
【０００５】
本発明の目的は、樹脂材料供給口付近における合成樹脂材料の滞留を確実に防止し得る押出機及びそれに対する着色剤の供給方法を提供することである。
【０００６】
【課題を解決するための手段】
請求項１に係る押出機は、スクリューシリンダの外周壁に形成された樹脂材料供給口の押出方向の前端部と、スクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間において、スクリューシリンダ内に開口する着色剤供給口を設け、前記着色剤供給口に対して液状着色剤を供給する着色剤供給手段を設けたものである。
【０００７】
ここで、請求項２のように、前記樹脂材料供給口の少なくとも前端部を別部材で構成し、この別部材のスクリューシリンダ側の端面に着色剤供給口を形成してもよい。
請求項３に係る押出機に対する着色剤の供給方法は、着色剤供給手段から供給される液状着色剤を、スクリューシリンダの外周壁に形成された樹脂材料供給口の押出方向の前端部と、スクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間に形成した着色剤供給口からスクリューシリンダ内に供給し、スクリューシリンダ内の合成樹脂材料に液状着色剤を混ぜ合わせるものである。
【０００８】
【作用】
本発明に係る押出機においては、スクリューシリンダの外周壁に形成された樹脂材料供給口の押出方向の前端部と、スクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間に形成された着色剤供給口からスクリューシリンダ内へ液状着色剤を供給するので、液状着色剤はスクリューシリンダとスクリュー間に送り込まれる直前或いは送り込まれた後の合成樹脂材料に混ぜ合わされることになり、合成樹脂材料が樹脂材料供給口付近で滞留することが防止される。
【０００９】
また、開口部の少なくとも前端部に別部材を設け、この別部材のスクリューシリンダ側の端面に着色剤供給口を形成した場合には、液状着色剤が別部材とスクリュー間に送り込まれた合成樹脂材料に対して混ぜ合わされることになり、合成樹脂材料が樹脂材料供給口付近で滞留することが確実に防止される。
【００１０】
【実施例】
以下、本発明の実施例について図面を参照しながら説明する。
本実施例は、射出成形装置や押出成形装置などの成形装置の押出機に本発明を適用した場合のものである。
図１に示すように、押出機１のスクリューシリンダ２にはスクリュー３が回転自在に且つ前後移動自在に装着され、スクリューシリンダ２の後端近傍上部にはホッパ４が設けられ、ホッパ４の下端部はスクリューシリンダ２の上壁部に形成された樹脂材料供給口５に接続され、ホッパ４に充填されたペレット状の合成樹脂材料６は、樹脂材料供給口５を介してスクリューシリンダ２とスクリュー３間の隙間に供給される。尚、前記合成樹脂材料６としては、球状、フットボールや円筒状などに成形されたペレット状の合成樹脂材料６以外に、直方体状、立方体状や平板状に形成されたものを用いることが可能である。
【００１１】
前記押出機１において、ホッパ４から供給された合成樹脂材料６は、図示外の回転手段で回転されるスクリュー３により、スクリューシリンダ２とスクリュー３間の隙間を通って前方へ送給され、スクリューシリンダ２の前半部に外装されたヒータ７により加熱溶融されてスクリューシリンダ２の前端部内に序々に充填される。そして、充填された合成樹脂材料によりスクリュー３が後退移動して、１回の成形に必要な量の合成樹脂材料６が充填されると、スクリュー３が図示外の油圧シリンダにより前方へ駆動されて充填された合成樹脂材料６がダイスや金型の成形キャビティ内に圧送され、成形品が成形されることになる。
【００１２】
一方、前記押出機１には、図１〜図３に示すように、成形品を着色するための着色剤供給手段１０が設けられ、この着色剤供給手段１０は、顔料及び又は染料と界面活性剤とからなる液状着色剤１１が充填された着色剤タンク１２と、着色剤タンク１２内の液状着色剤１１を吸引チューブ１３を介して吸引して合成樹脂材料６に対する混合比率が所定比率になるように液状着色剤１１を供給チューブ１４へ供給する供給装置１５と、樹脂材料供給口５の押出方向の前端部付近に設けられた平面視略三日月状のブロック部材１６とを備えている。
【００１３】
前記ブロック部材１６の下端面はスクリューシリンダ２の内周面に連なるように円弧状に形成され、供給チューブ１４の下流部はブロック部材１６を上下に貫通して設けられ、供給チューブ１４の下流端にはブロック部材１６の下端面とスクリュー３間の隙間に開口する着色剤供給口１７が形成されている。但し、ブロック部材１６とスクリュー３間の合成樹脂材料６はまだ加熱溶融していないので、合成樹脂材料６が着色剤供給口１７へ侵入することはなく、液状着色剤１１は、ペレット状の合成樹脂材料６間の隙間に供給される。
【００１４】
ここで、前記ブロック部材１６を省略して、供給チューブ１４を、例えば図１に仮想線で示すように、樹脂材料供給口５の前端部と合成樹脂材料６が溶融する直前位置に対応するスクリューシリンダ２の部位間のスクリューシリンダ２の壁部を貫通するように設け、供給チューブ１４の下流端の着色剤供給口１７をスクリューシリンダ２とスクリュー３間の隙間に開口させてもよいし、樹脂材料供給口５の前端部の後側付近に設けてもよい。
【００１５】
次に、前記押出機１の作用について説明する。
供給チューブ１４の下流端の着色剤供給口１７をブロック部材１６の下端面に形成してあるので、液状着色剤１１はブロック部材１６とスクリュー３間の隙間に噛込まれた合成樹脂材料６に対して供給されることになり、ホッパ４から樹脂材料供給口５に対して供給された合成樹脂材料６に液状着色剤１１が付着して合成樹脂材料６の摩擦係数が小さくなることによる樹脂材料供給口５における合成樹脂材料６の滞留が確実に防止される。
しかも、樹脂材料供給口５にブロック部材１６を取付けて、供給チューブ１４の下流端をブロック部材１６とスクリュー３間に開口させるだけなので、既存の押出機に対しても本発明を容易に適用することが可能となる。
【００１６】
ここで、前記押出機１を備えた横型射出成形機により成形品として歯ブラシのハンドルを成形した場合における押出機１の性能試験について説明する。
比較例としては、前記押出機１からブロック部材１６を取り外した横型射出成形装置の押出機に対して、ペレット状の合成樹脂材料６と濃縮顔料からなる固形のマスターバッチを供給した。
そして、下記のテスト条件化で両者を連続９０時間稼働させて「表１」に示す結果を得た。
テスト条件：合成樹脂材料６に対する液状着色剤１１及びマスターバッチの混合比率１．１重量％、スクリュー３回転数６０％、背圧を１％、計量値６０ｍｍ、サックバック９ｍｍ
【００１７】
【表１】

Figure 0003550699
【００１８】
性能試験の終了後、本案例の樹脂材料供給口５付近を検査したが、液状着色剤１１が付着した合成樹脂材料６の滞留は確認されず、また「表１」からも液状着色剤１１を使用することによる可塑化計量時間への影響がないことが判る。
また、比較例よりも本案例の方が、ハンドルの色むらによる不良品の発生率が大幅に少なくなっていることが判る。
【００１９】
【発明の効果】
請求項１に係る押出機によれば、着色剤供給口を樹脂材料供給口の押出方向の前端部とスクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間に形成するという簡単な構成で、樹脂材料供給口付近における合成樹脂材料の滞留を防止して、押出機を長時間連続的に稼働させることが可能となる。
【００２０】
請求項２に係る押出機によれば、開口部の少なくとも前縁部を構成する別部材を設け、この別部材にスクリューシリンダ内に開口する着色剤供給口を形成するという簡単な構成で、樹脂材料供給口付近における合成樹脂材料の滞留を確実に防止することが出来る。
【００２１】
請求項３に係る押出機に対する着色剤の供給方法によれば、樹脂材料供給口の押出方向の前端部とスクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間に形成した着色剤供給口から液状着色剤を供給して、合成樹脂材料に液状着色剤を混ぜ合わせるという簡単な方法で、樹脂材料供給口付近における合成樹脂材料の滞留を防止して、押出機を長時間連続的に稼働させることが可能となる。
【図面の簡単な説明】
【図１】押出機のホッパ付近の縦断面図
【図２】図１の２−２線断面図
【図３】樹脂材料供給口付近の縦断面図
【符号の説明】
１ 押出機
２ スクリューシリンダ
３ スクリュー
４ ホッパ
５ 樹脂材料供給口
６ 合成樹脂材料
７ ヒータ
１０ 着色剤供給手段
１１ 液状着色剤
１２ 着色剤タンク
１３ 吸引チューブ
１４ 供給チューブ
１５ 供給装置
１６ ブロック部材
１７ 着色剤供給口[0001]
[Industrial applications]
The present invention relates to an extruder provided with a colorant supply unit for supplying a liquid colorant for coloring a molded article into a screw cylinder, and a method of supplying a colorant to the extruder.
[0002]
[Prior art]
Usually, a molding apparatus such as an injection molding apparatus or an extrusion molding apparatus is provided with an extruder that heats and melts a synthetic resin material while kneading it and extrudes the synthetic resin material into a molding cavity of a mold or a die side.
By the way, when producing a colored molded product by a molding apparatus, a solid master batch composed of a synthetic resin material in the form of a pellet and a concentrated pigment is passed through a resin material supply port formed at the rear of a screw cylinder of an extruder to a predetermined amount. The mixture is supplied at a predetermined ratio, and is heated and melted while kneading the two in a screw cylinder, whereby a colored molded product is obtained.
[0003]
However, when producing a colored molded article by the above method, a large colorant supply means for supplying a solid master batch is required, and the dispersibility of the solid master batch is not so good. There is a problem that color unevenness is likely to occur due to poor kneading of the synthetic resin material and the master batch.
Therefore, by supplying a liquid colorant comprising a pigment and / or a dye and a surfactant to a resin material supply port together with a synthetic resin material, the colorant supply means is made compact and color unevenness of a molded product is prevented. Extruders have been proposed.
[0004]
[Problems to be solved by the invention]
However, in the extruder, since the liquid colorant is supplied to the resin material supply port together with the synthetic resin material, the liquid colorant adheres to the pellet-shaped synthetic resin material in the vicinity of the resin material supply port, and the liquid colorant adheres between the synthetic resin material and the screw. Slip occurs and the synthetic resin material does not bite smoothly between the screw cylinder and the screw. During repeated shots, the synthetic resin material gradually stays near the resin material supply port, resulting in continuous production for 10 to 20 hours. Later, the resin material supply port was closed by the accumulated synthetic resin material, and the supply failure of the synthetic resin material occurred, and there was a problem that the extruder stopped due to measurement time over, and the configuration was not endurable for continuous production.
[0005]
An object of the present invention is to provide an extruder that can surely prevent stagnation of a synthetic resin material near a resin material supply port and a method of supplying a colorant to the extruder.
[0006]
[Means for Solving the Problems]
Extrusion machine according to claim 1, the front end portion of the extrusion direction of the resin material feed port formed in the outer peripheral wall of the screw cylinder, and the synthetic resin material is melted behind the extrusion direction than armored heater screw cylinder Between the parts of the screw cylinder corresponding to the position immediately before the start of the process, a colorant supply port opened in the screw cylinder is provided, and a colorant supply means for supplying a liquid colorant to the colorant supply port is provided. It is.
[0007]
Here, as in claim 2, at least the front end portion of the resin material feed port formed as separate members may be formed a coloring agent supply port to the end surface of the screw cylinder side of the separate member.
A method for supplying a colorant to an extruder according to claim 3, wherein the liquid colorant supplied from the colorant supply means is formed by screwing a front end portion of a resin material supply port formed in an outer peripheral wall of a screw cylinder in a pushing direction; A colorant supply port formed between the portions of the screw cylinder corresponding to the position immediately before the synthetic resin material starts melting, behind the heater provided in the cylinder and immediately before the start of melting of the synthetic resin material, is supplied into the screw cylinder. And a liquid colorant is mixed with the synthetic resin material.
[0008]
[Action]
In the extruder according to the present invention, the extrusion direction of the front end portion of the outer peripheral wall which is formed on the resin material feed port of the screw cylinder, and the synthetic resin material is melted behind the extrusion direction than the heater which is externally mounted on the screw cylinder The liquid colorant is supplied into the screw cylinder from the colorant supply port formed between the portions of the screw cylinder corresponding to the position immediately before starting, so that the liquid colorant is fed immediately before or between the screw cylinder and the screw. The synthetic resin material is mixed with the synthetic resin material after the mixing, so that the synthetic resin material is prevented from staying near the resin material supply port.
[0009]
Furthermore, provided the separate member on at least the front end portion of the opening, in the case of forming the coloring agent supply port to the end surface of the screw cylinder side of the other member, synthetic resin liquid colorant is fed between the separate members and the screw As a result, the synthetic resin material is reliably prevented from staying near the resin material supply port.
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, the present invention is applied to an extruder of a molding device such as an injection molding device or an extrusion molding device.
As shown in FIG. 1, a screw 3 is rotatably and reciprocally movable mounted on a screw cylinder 2 of the extruder 1, and a hopper 4 is provided above a rear end of the screw cylinder 2, and a lower end of the hopper 4 is provided. The portion is connected to a resin material supply port 5 formed in the upper wall of the screw cylinder 2, and the pellet-shaped synthetic resin material 6 filled in the hopper 4 is screwed into the screw cylinder 2 via the resin material supply port 5. 3 is supplied to the gap. In addition, as the synthetic resin material 6, in addition to the pellet-like synthetic resin material 6 formed into a spherical shape, a football shape, a cylindrical shape, or the like, a material formed in a rectangular parallelepiped shape, a cubic shape, or a flat plate shape can be used. is there.
[0011]
In the extruder 1, the synthetic resin material 6 supplied from the hopper 4 is fed forward through a gap between the screw cylinder 2 and the screw 3 by a screw 3 rotated by a rotating means (not shown). Heated and melted by a heater 7 provided on the front half of the cylinder 2, the filler is gradually filled into the front end of the screw cylinder 2. Then, the screw 3 is moved backward by the filled synthetic resin material, and when the amount of the synthetic resin material 6 necessary for one molding is filled, the screw 3 is driven forward by a hydraulic cylinder (not shown). The filled synthetic resin material 6 is fed under pressure into a molding cavity of a die or a mold, and a molded product is molded.
[0012]
On the other hand, as shown in FIGS. 1 to 3, the extruder 1 is provided with a colorant supply means 10 for coloring a molded product. Tank 12 filled with a liquid colorant 11 composed of a colorant and a liquid colorant 11 in the colorant tank 12 through a suction tube 13 so that a mixing ratio with respect to the synthetic resin material 6 becomes a predetermined ratio. A supply device 15 for supplying the liquid colorant 11 to the supply tube 14 as described above, and a substantially crescent-shaped block member 16 in plan view provided near the front end of the resin material supply port 5 in the extrusion direction.
[0013]
The lower end surface of the block member 16 is formed in an arc shape so as to be continuous with the inner peripheral surface of the screw cylinder 2, and the downstream portion of the supply tube 14 is provided vertically penetrating the block member 16, and the downstream end of the supply tube 14 is provided. Is formed with a colorant supply port 17 that opens into a gap between the lower end surface of the block member 16 and the screw 3. However, since the synthetic resin material 6 between the block member 16 and the screw 3 has not yet been heated and melted, the synthetic resin material 6 does not enter the colorant supply port 17 and the liquid colorant 11 is formed into a pellet-like synthetic resin. It is supplied to the gap between the resin materials 6.
[0014]
Here, the block member 16 is omitted, and the supply tube 14 is connected to the screw corresponding to the front end of the resin material supply port 5 and the position immediately before the synthetic resin material 6 is melted, for example, as shown by the phantom line in FIG. The colorant supply port 17 at the downstream end of the supply tube 14 may be provided in a gap between the screw cylinder 2 and the screw 3, and may be provided so as to penetrate the wall of the screw cylinder 2 between the portions of the cylinder 2. It may be provided near the rear side of the front end of the material supply port 5.
[0015]
Next, the operation of the extruder 1 will be described.
Since the colorant supply port 17 at the downstream end of the supply tube 14 is formed at the lower end surface of the block member 16, the liquid colorant 11 is applied to the synthetic resin material 6 caught in the gap between the block member 16 and the screw 3. The liquid material 11 adheres to the synthetic resin material 6 supplied from the hopper 4 to the resin material supply port 5 to reduce the friction coefficient of the synthetic resin material 6. The stagnation of the synthetic resin material 6 in the supply port 5 is reliably prevented.
In addition, since the block member 16 is attached to the resin material supply port 5 and the downstream end of the supply tube 14 is simply opened between the block member 16 and the screw 3, the present invention can be easily applied to an existing extruder. It becomes possible.
[0016]
Here, a performance test of the extruder 1 when the handle of the toothbrush is molded as a molded product by the horizontal injection molding machine having the extruder 1 will be described.
As a comparative example, a solid master batch composed of a pellet-shaped synthetic resin material 6 and a concentrated pigment was supplied to an extruder of a horizontal injection molding apparatus in which the block member 16 was removed from the extruder 1.
Then, both were operated continuously for 90 hours under the following test conditions, and the results shown in Table 1 were obtained.
Test conditions: mixing ratio of liquid colorant 11 and masterbatch to synthetic resin material 6 1.1% by weight, screw 3 rotations 60%, back pressure 1%, weighing value 60mm, suck back 9mm
[0017]
[Table 1]
Figure 0003550699
[0018]
After the performance test, the vicinity of the resin material supply port 5 of the present invention was inspected. However, the retention of the synthetic resin material 6 to which the liquid colorant 11 adhered was not confirmed. It can be seen that the use does not affect the plasticizing measurement time.
Further, it can be seen that the occurrence rate of defective products due to uneven color of the handle is significantly smaller in the present example than in the comparative example.
[0019]
【The invention's effect】
According to the extrusion machine according to claim 1, and a synthetic resin material in the extrusion direction of the rearward of the coloring agent supply port are externally mounted on the extrusion direction of the front end portion and the screw cylinder of the resin material feed port heater starts to melt With the simple configuration of forming between the screw cylinder portions corresponding to the immediately preceding position, it is possible to prevent the synthetic resin material from staying near the resin material supply port and to operate the extruder continuously for a long time. .
[0020]
According to the extruder according to claim 2, a resin having a simple configuration in which a separate member constituting at least a front edge portion of the opening is provided, and a colorant supply port opened in the screw cylinder is formed in the separate member. Stagnation of the synthetic resin material near the material supply port can be reliably prevented.
[0021]
According to the method of supplying the colorant for an extruder according to claim 3, initiate and synthetic resin material is melted in the extrusion direction of the rear of the armored heater in the extrusion direction of the front end portion and the screw cylinder of the resin material feed port The liquid colorant is supplied from the colorant supply port formed between the parts of the screw cylinder corresponding to the position immediately before the mixing, and the liquid colorant is mixed with the synthetic resin material. The resin material can be prevented from staying, and the extruder can be operated continuously for a long time.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view near a hopper of an extruder. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a longitudinal sectional view near a resin material supply port.
DESCRIPTION OF SYMBOLS 1 Extruder 2 Screw cylinder 3 Screw 4 Hopper 5 Resin material supply port 6 Synthetic resin material 7 Heater 10 Colorant supply means 11 Liquid colorant 12 Colorant tank 13 Suction tube 14 Supply tube 15 Supply device 16 Block member 17 Colorant supply mouth

Claims (3)

スクリューシリンダの外周壁に形成された樹脂材料供給口の押出方向の前端部と、スクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間において、スクリューシリンダ内に開口する着色剤供給口を設け、
前記着色剤供給口に対して液状着色剤を供給する着色剤供給手段を設けたことを特徴とする押出機。 Screw the front end portion of the extrusion direction of the outer peripheral wall which is formed on the resin material feed port of the screw cylinder, and a synthetic resin material behind the extrusion direction than armored heater screw cylinder corresponding to the immediately preceding position to start the melting Between the parts of the cylinder, provided a colorant supply port opened in the screw cylinder,
An extruder comprising a colorant supply means for supplying a liquid colorant to the colorant supply port. 前記樹脂材料供給口の少なくとも前端部を別部材で構成し、この別部材のスクリューシリンダ側の端面に着色剤供給口を形成したことを特徴とする請求項１に記載の押出機。The extruder according to claim 1, wherein at least a front end of the resin material supply port is formed of a separate member, and a colorant supply port is formed on an end surface of the separate member on the screw cylinder side. 着色剤供給手段から供給される液状着色剤を、スクリューシリンダの外周壁に形成された樹脂材料供給口の押出方向の前端部と、スクリューシリンダに外装されたヒータよりも押出方向の後方で且つ合成樹脂材料が溶融を開始する直前位置に対応するスクリューシリンダの部位間に形成した着色剤供給口からスクリューシリンダ内に供給し、スクリューシリンダ内の合成樹脂材料に液状着色剤を混ぜ合わせることを特徴とする押出機に対する着色剤の供給方法。The liquid colorant supplied from the colorant supply means is combined with the front end of the resin material supply port formed on the outer peripheral wall of the screw cylinder in the extrusion direction, and behind and in the extrusion direction of the heater provided on the screw cylinder. The resin material is supplied into the screw cylinder from a colorant supply port formed between the positions of the screw cylinder corresponding to the position immediately before the melting starts, and the liquid colorant is mixed with the synthetic resin material in the screw cylinder. To supply the colorant to the extruder.
JP22377093A 1993-09-09 1993-09-09 Extruder and method for supplying colorant thereto Expired - Fee Related JP3550699B2 (en)

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