JP3712185B2 - Fine powder material supply equipment - Google Patents

Fine powder material supply equipment Download PDF

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Publication number
JP3712185B2
JP3712185B2 JP2001008399A JP2001008399A JP3712185B2 JP 3712185 B2 JP3712185 B2 JP 3712185B2 JP 2001008399 A JP2001008399 A JP 2001008399A JP 2001008399 A JP2001008399 A JP 2001008399A JP 3712185 B2 JP3712185 B2 JP 3712185B2
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Japan
Prior art keywords
raw material
fine powder
powder raw
barrel
material supply
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JP2001008399A
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JP2002210805A (en
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誠二 高本
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Japan Steel Works Ltd
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Japan Steel Works Ltd
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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
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
    • B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/845—Venting, degassing or removing evaporated components in devices with rotary stirrers
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/763—Vent constructions, e.g. venting means avoiding melt escape

Description

【０００１】
【発明の属する技術分野】
本発明は、ポリマーにかさ密度の小さい微粉原料を混合して押し出す押出機に、前記微粉原料を供給するための微粉原料供給装置に関するものである。
【０００２】
【従来の技術】
ポリマーにかさ密度の小さい微粉原料を混合して押し出す押出機に用いられる、従来の微粉原料供給装置の一例について説明する。
【０００３】
図６に示すように、押出機２０１は、加熱シリンダ２０２と、加熱シリンダ２０２内に回転自在に配設されたかみ合い型の２本のスクリュ２０３と、２本のスクリュ２０３を同方向または逆方向へ回転させるための図示しない回転駆動機構と、混練部の上流側における加熱シリンダ２０２の側壁に設けられた微粉原料供給口２０４を備えている。
【０００４】
他方、微粉原料供給装置１０１は、先端に吐出口１０２ａを有するとともに後端側にホッパ１０４を有するバレル１０２と、バレル１０２内に回転自在に配設されたかみ合い型の２本のスクリュ１０３と、２本のスクリュ１０３を同方向または逆方向へ回転させる回転駆動機構１０５を備え、ホッパ１０４にはガス抜き口１０６が設けられているとともに、バレル１０２の吐出口１０２ａが押出機２０１における加熱シリンダ２０２の微粉原料供給口２０４に連通されている。
【０００５】
この従来の微粉原料供給装置１０１において、ホッパ１０４内に投入された微粉原料は、混在する空気がガス抜き口１０６を介して強制排気されたのち、バレル１０２内において同方向または逆方向へ回転する２本のスクリュ１０３によって先端側へ移送され、吐出口１０２ａより押出機２０１の微粉原料供給口２０４を介して加熱シリンダ２０１内に供給され、押出機２０１内においてポリマーと混合されたのち押し出される。
【０００６】
【発明が解決しようとする課題】
上記従来の技術においては、ホッパに供給された微粉原料に混在する空気をホッパに設けられたガス抜き口を介して強制排気しているが、これだけでは微粉原料中に混在する空気を十分に除去することができず、ホッパ中の微粉原料に混在する空気量が多くなって微粉原料のかさ密度が低減し、微粉原料供給装置の実質的な微粉原料輸送能力が低下してしまう。その結果、押出機への微粉原料の供給量が不安定になる。加えて、押出機においてポリマー中の揮発成分がガス化して、微粉原料供給装置のバレル内へ逆流すると、微粉原料供給装置の輸送能力が極端に減少してしまうという問題点があった。
【０００７】
本発明は、上記従来の技術の有する問題点に鑑みてなされたものであって、バレル内における微粉原料中に混入した空気やガスを十分に強制排気して、高い輸送能力を安定して維持することができる、ポリマーにかさ密度の小さい微粉原料を混合して押し出す押出機に、前記微粉原料を供給するための微粉原料供給装置を実現することを目的とするものである。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明の微粉原料供給装置は、ポリマーにかさ密度の小さい微粉原料を混合して押し出す押出機に、前記微粉原料を供給するための微粉原料供給装置であって、前記微粉原料供給装置は、一端に前記押出機の加熱シリンダの側壁に設けられた微粉原料供給口に接続される吐出口を有するとともに他端側にホッパを有するバレルと、前記バレル内に回転自在に配設されたスクリュと、前記スクリュを回転させる回転駆動機構と、前記バレルにおける前記ホッパと前記吐出口間の壁に外壁面から内壁面へ貫通して設けられた少なくとも２個のベント口と、前記ベント口のバレル外壁側開口部に連通された強制排気室と、前記ベント口内に装着されたスクリーンユニットとを備えており、前記スクリーンユニットは、前記バレルの内壁面とほぼ同一面になる多孔板状の湾曲壁および前記湾曲壁に相対する面が開放された箱状の受け部材と、前記湾曲壁を覆う前記微粉原料の平均粒径よりも小さい網目を有するスクリーンと、前記スクリーンを前記受け部材の前記湾曲壁に密着させるとともにベント流路を形成する格子状の押え板を有する押え部材とを備えたことを特徴とするものである。
【０００９】
また、バレルの壁に、冷却媒体を流す冷却用ジャケットを内設する。
【００１０】
さらに、強制排気室に、給気用バルブを介して給気用ダクトの一端側を接続し、前記給気用ダクトを介して加圧した空気または不活性ガスを瞬間供給してスクリーンの逆洗浄ができるように構成する。
【００１１】
また、強制排気室に、内圧を検出するための圧力計を付設する。
【００１２】
【発明の実施の形態】
本発明に係る微粉原料供給装置の一実施の形態について説明する。
【００１３】
図１に示すように、微粉原料供給装置１は、先端に吐出口２ａを有するとともに後端側にホッパ４が設けられたバレル２と、バレル２内に回転自在に配設されたかみ合い型の２本のスクリュ３と、２本のスクリュ３を同方向または逆方向へ回転させる回転駆動機構５を備えており、吐出口２ａが押出機４１の加熱シリンダ４２の側壁に設けられた微粉原料供給口４４に連通された状態で配設されている。
【００１４】
バレル２における吐出口２ａとホッパ４間の図示両側壁には、図２に示すように、外壁面から内壁面へ貫通したベント口８が相対して設けられており、各ベント口８内には後述するスクリーンユニット１０が装着されているとともに、各ベント口８の外壁面側開口部が強制排気室２０にそれぞれ連通されている。
【００１５】
また、バレル２のベント口８を避けた壁内には、冷却用ジャケット６を内設し、微粉原料が低融点のものである場合に、冷却ジャケット６に冷却媒体を流して冷却できるように構成されている。
【００１６】
各強制排気室２０には、排気用バルブ２１を介して排気用ダクト２２の一端側が接続されており、この排気用ダクト２２の他端側は強制排気手段（不図示）に接続されている。
【００１７】
なお、本実施の形態において、各強制排気室２０には、給気用バルブ２３を介して給気用ダクト２４の一端側が接続されている。
【００１８】
また、各強制排気室２０には、内部を観察するためののぞき窓２６や、内圧を検出するための圧力計２５が設けられている。
【００１９】
さらに、バレル２におけるベント口８の下流側に圧力計２７を設け、この圧力計によってバレル２内の異常圧力を検出した場合に、その信号を制御システムに送って運転停止を行なう等の安全対策に用いることができる。
【００２０】
加えて、ホッパ４にレベルセンサ２８を配設し、このレベルセンサ２８によってホッパ内の微粉原料のレベルを検出することにより、輸送能力を管理するようになっている。
【００２１】
スクリーンユニット１０は、図３および図４に示すように、バレル２の内壁面２ｂとほぼ同じ曲率半径を有する多孔板状の湾曲壁１２ａを備えるとともに湾曲壁１２ａに相対する面が開放されている箱状の受け部材１２と、受け部材１２の湾曲壁１２ａを覆う形状であって微粉原料の平均粒径よりも小さい網目を有するスクリーン１１と、スクリーン１１を湾曲壁１２ａに密着させるとともにベント流路を形成する格子状の押え板１３ｂを有する押え部材１３とを備えている。
【００２２】
押え部材１３は、受け部材１２内に着脱自在に嵌挿できる形状であって相対する面が開放された外枠１３ａと、外枠１３ａ内に一体的に設けられた格子状の押え板１３ｂからなり、押え板１３ｂのスクリーン１１に当接する先端１３ｃは、スクリーン１１を湾曲壁１２ａに密着させた状態で保持できるように湾曲壁１２ａと同様に湾曲している。
【００２３】
なお、本実施の形態においては、受け部材１２の開放縁部に鍔状部１２ｃを設けるとともに、押え部材１３にも鍔状部１３ｄを設け、受け部材１２に押え部材１３を嵌挿すると両鍔状部１２ｃ、１３ｄが重なるようにし、この両鍔状部１２ｃ、１３ｄを図示しないビス等の着脱自在な固着手段を用いて着脱自在に固着するように構成されている。このため、スクリーン１１の交換が自在であり、スクリーン１１が破損した場合に新しいスクリーン１１と交換することができる。
【００２４】
スクリーンユニット１０は、上述のとおり構成されているので、スクリーンユニット１０を受け部材１２の多孔板状の湾曲壁１２ａがバレル２の内壁面２ｂとほぼ同一面になるようにベント口８内に装着すると、ベント口８のバレル２の内壁面側開口部がスクリーン１１によって覆われる。その結果、バレル２内の微粉原料は通過しないが、混在する空気やガスは通過して強制排気室２０内へ流れる。
【００２５】
なお、多孔板状の湾曲壁１２ａとスクリュ３のフライト外周面との間隙は、１ｍｍ以下に設定すると、湾曲壁１２ａのセルフクリーニング性が向上する。
【００２６】
続いて、本実施の形態による微粉原料供給装置の動作について説明する。
【００２７】
通常運転時には、各強制排気室２０の給気用バルブ２３を閉じ、排気用バルブ２１を開いて排気用ダクト２２と強制排気室２０とを連通させ、排気用ダクト２２の他端側に接続された強制排気手段によって強制排気室２０を減圧した強制排気状態にする。
【００２８】
ホッパ４に供給された微粉原料は、ホッパ４に設けられたガス抜き口７より混在する空気の一部が強制排気されたのち、バレル２内に入り、回転している２本のスクリュ３によって吐出口２ａへ向けて搬送されて行く。
【００２９】
微粉原料がホッパ４よりバレル２内に入る際にホッパ４内の空気がまき込まれて微粉原料に混入するが、この微粉原料に混入した空気は各ベント口８に装着されたスクリーンユニット１０のスクリーン１１の網目を通過して矢印で示すように強制排気室２０へ流れ、排気用ダクト２２を介して強制排気される。
【００３０】
その結果、バレル２内を吐出口２ａに向けて搬送される微粉原料は、空気の混入によるかさ密度の低下が防止され、微粉原料供給装置１の微粉原料輸送能力が低減することがなく、スクリュ式押出機４１の微粉原料供給口４４より一定量の微粉原料が安定供給される。
【００３１】
スクリーン１１の目詰まりが発生した場合には、排気用バルブ２１を閉じ、給気用バルブ２３を開いて給気用ダクト２４と強制排気室２０とを連通させた状態にし、給気用ダクト２４を介して加圧した空気または不活性ガスを強制排気室２０内へ瞬間供給（パルス供給）する。強制排気室２０内へ瞬間供給（パルス供給）された加圧した空気または不活性ガスは、スクリーンユニット１０を逆流してスクリーン１１の網目に目詰まりした微粉原料をバレル２内へ向かって吹き飛ばす。つまり、逆洗浄を行なってスクリーンの目詰まりを解消する。
【００３２】
なお、この逆洗浄は、各ベント口８のスクリーンユニット１０毎に行なうことができることはいうまでもない。
【００３３】
次に、本発明に係る微粉原料供給装置の他の実施の形態について説明する。図５に示すように、本実施の形態による微粉原料供給装置３１は、バレル２の両側壁に２個のベント口８を相対して設けるとともに、バレル２の図示上面壁に２個のベント口８を併設し、各ベント口８のバレル外壁側開口部がそれぞれ強制排気室２０に連通されている。これ以外は、上述した一実施の形態による微粉原料供給装置と同様であるので、その説明は省略する。
【００３４】
なお、上述した各実施の形態においては、バレル２内にかみ合い型の２本のスクリュを有するものを示したが、これに限らず本発明は、バレル２内に１本のスクリュを有するものやバレル２内に非かみ合い型の２本のスクリュを有するものに適用できることはいうまでもない。
【００３５】
また、ベント口の数も、上述した各実施の形態に示した２個または４個に限らず、必要に応じて３個あるいは５個以上に変更できる。
【００３６】
【発明の効果】
本発明は、上述のとおり構成されているので、次に記載するような効果を奏する。
【００３７】
バレルに設けられたベント口に装着されたスクリーンユニットの微粉原料の平均粒径よりも小さい網目を有するスクリーンを通して、微粉原料に混入した空気またはガスを強制排気するため、バレル内における微粉原料のかさ密度の低下が防止されて高い輸送能力を維持することができる。その結果、小型化が可能であるとともに、ポリマーに微粉原料を混合して押し出す押出機へ微粉原料を安定供給することができる。
また、押え部材は受け部材内に着脱自在であるため、スクリーンの交換が自在である。
【図面の簡単な説明】
【図１】一実施の形態による微粉原料供給装置の説明図である。
【図２】図１のＡ−Ａ線に沿う模式断面図である。
【図３】図１に示す微粉原料供給装置におけるスクリーンユニットを、一部破断して示す模式斜視図である。
【図４】図３に示したスクリーンユニットを分解して示す模式斜視図である。
【図５】他の実施の形態による微粉原料供給装置の説明図である。
【図６】従来の微粉原料供給装置の一例を示す説明図である。
【符号の説明】
１、３１ 微粉原料供給装置
２ バレル
３ スクリュ
４ ホッパ
５ 回転駆動機構
６ 冷却用ジャケット
７ ガス抜き口
８ ベント口
１０ スクリーンユニット
１１ スクリーン
１２ 受け部材
１２ａ 湾曲壁
１２ｂ 孔
１２ｃ 鍔状部
１３ 押え部材
１３ａ 外枠
１３ｂ 押え板
１３ｃ 先端
２０ 強制排気室
２１ 排気用バルブ
２２ 排気用ダクト
２３ 給気用バルブ
２４ 給気用ダクト
２５、２７ 圧力計
２６ のぞき窓
２８ レベルセンサ
４１ 押出機
４２ 加熱シリンダ
４３ スクリュ
４４ 微粉原料供給口[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fine powder raw material supply apparatus for supplying the fine powder raw material to an extruder for mixing and extruding a fine powder raw material having a small bulk density to a polymer.
[0002]
[Prior art]
An example of a conventional fine powder raw material supply apparatus used in an extruder for extruding a polymer by mixing a fine powder raw material with a small bulk density will be described.
[0003]
As shown in FIG. 6, the extruder 201 is heated and Cylinders 202, and two screws 203 of intermeshing rotatably disposed within the heating cylinder 202, two screw 203 same or opposite A rotation drive mechanism (not shown) for rotating in the direction, and a fine material feed port 204 provided on the side wall of the heating cylinder 202 on the upstream side of the kneading section.
[0004]
On the other hand, the fine powder raw material supply apparatus 101 includes a barrel 102 having a discharge port 102a at the front end and a hopper 104 at the rear end side, and two meshing type screws 103 rotatably disposed in the barrel 102, A rotary drive mechanism 105 that rotates the two screws 103 in the same direction or in the opposite direction is provided. The hopper 104 is provided with a gas vent port 106, and the discharge port 102 a of the barrel 102 is a heating cylinder 202 in the extruder 201. To the fine powder raw material supply port 204.
[0005]
In this conventional fine powder raw material supply apparatus 101, the fine powder raw material charged into the hopper 104 rotates in the same direction or in the reverse direction within the barrel 102 after the mixed air is forcibly exhausted through the gas vent 106. It is transferred to the tip side by the two screws 103, supplied into the heating cylinder 201 from the discharge port 102a via the fine powder material supply port 204 of the extruder 201, mixed with the polymer in the extruder 201, and then extruded.
[0006]
[Problems to be solved by the invention]
In the above conventional technology, air mixed in the fine powder material supplied to the hopper is forcibly exhausted through the vent hole provided in the hopper, but this alone sufficiently removes the air mixed in the fine powder material. The amount of air mixed in the fine powder raw material in the hopper increases, the bulk density of the fine powder raw material is reduced, and the substantial fine powder raw material transport capability of the fine powder raw material supply device is reduced. As a result, the supply amount of the fine powder raw material to the extruder becomes unstable. In addition, if the volatile component in the polymer is gasified in the extruder and flows back into the barrel of the fine powder raw material supply apparatus, there is a problem that the transport capability of the fine powder raw material supply apparatus is extremely reduced.
[0007]
The present invention has been made in view of the above-described problems of the prior art, and sufficiently forcibly exhausts air and gas mixed in the fine powder raw material in the barrel to stably maintain a high transport capability. An object of the present invention is to realize a fine powder raw material supply device for supplying the fine powder raw material to an extruder that can mix and extrude a fine powder raw material having a low bulk density into a polymer.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the fine powder raw material supply apparatus of the present invention is a fine powder raw material supply apparatus for supplying the fine powder raw material to an extruder that mixes and extrudes a fine powder raw material having a small bulk density to a polymer. The fine raw material supply device has a discharge port connected to a fine powder raw material supply port provided on a side wall of the heating cylinder of the extruder at one end and a barrel having a hopper at the other end, and is rotatable in the barrel. An arranged screw, a rotation drive mechanism for rotating the screw, and at least two vent ports provided through the wall between the hopper and the discharge port in the barrel from the outer wall surface to the inner wall surface ; wherein the forcible exhaust chamber communicating with the barrel outer wall side opening of the vent port, and a screen unit mounted to the vent in the opening, wherein the screen unit, the A perforated plate-like curved wall that is substantially flush with the inner wall surface of the rel, a box-shaped receiving member having an open surface facing the curved wall, and an average particle size of the fine powder raw material that covers the curved wall A screen having a mesh, and a pressing member having a grid-like pressing plate for bringing the screen into close contact with the curved wall of the receiving member and forming a vent channel are provided.
[0009]
In addition, a cooling jacket for flowing a cooling medium is provided in the wall of the barrel.
[0010]
Further, one end side of the air supply duct is connected to the forced exhaust chamber via the air supply valve, and the pressurized air or inert gas is instantaneously supplied through the air supply duct to reversely clean the screen. Configure to be able to.
[0011]
A pressure gauge for detecting the internal pressure is attached to the forced exhaust chamber.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a fine powder raw material supply apparatus according to the present invention will be described.
[0013]
As shown in FIG. 1, the fine powder raw material supply apparatus 1 includes a barrel 2 having a discharge port 2 a at the front end and a hopper 4 provided at the rear end side, and a meshing type rotatably disposed in the barrel 2. A fine powder raw material supply provided with two screws 3 and a rotary drive mechanism 5 for rotating the two screws 3 in the same direction or in the opposite direction, and the discharge port 2a provided on the side wall of the heating cylinder 42 of the extruder 41. It is arranged in communication with the port 44.
[0014]
As shown in FIG. 2, a vent port 8 penetrating from the outer wall surface to the inner wall surface is provided on both side walls of the barrel 2 between the discharge port 2 a and the hopper 4. Is equipped with a screen unit 10 which will be described later, and the opening on the outer wall surface side of each vent port 8 communicates with the forced exhaust chamber 20.
[0015]
Further, a cooling jacket 6 is provided in the wall of the barrel 2 avoiding the vent port 8 so that when the fine powder material has a low melting point, the cooling jacket 6 can be cooled by flowing a cooling medium. It is configured.
[0016]
Each forced exhaust chamber 20 is connected to one end side of an exhaust duct 22 via an exhaust valve 21, and the other end side of the exhaust duct 22 is connected to forced exhaust means (not shown).
[0017]
In the present embodiment, each forced exhaust chamber 20 is connected to one end side of an air supply duct 24 via an air supply valve 23.
[0018]
Each forced exhaust chamber 20 is provided with a viewing window 26 for observing the inside and a pressure gauge 25 for detecting the internal pressure.
[0019]
Further, a pressure gauge 27 is provided on the downstream side of the vent port 8 in the barrel 2, and when an abnormal pressure in the barrel 2 is detected by the pressure gauge, a safety measure is taken such as sending a signal to the control system to stop the operation. Can be used.
[0020]
In addition, a level sensor 28 is provided in the hopper 4, and the level sensor 28 detects the level of the fine powder raw material in the hopper, thereby managing the transportation capacity.
[0021]
As shown in FIGS. 3 and 4, the screen unit 10 includes a perforated plate-like curved wall 12a having substantially the same radius of curvature as the inner wall surface 2b of the barrel 2, and a surface facing the curved wall 12a is open. A box-shaped receiving member 12, a screen 11 having a shape covering the curved wall 12a of the receiving member 12 and having a mesh smaller than the average particle diameter of the fine powder raw material, the screen 11 being in close contact with the curved wall 12a and a vent channel And a presser member 13 having a grid-like presser plate 13b.
[0022]
The pressing member 13 includes a shape that can be removably inserted into the receiving member 12, and an outer frame 13 a that has an open opposite surface, and a lattice-shaped pressing plate 13 b that is integrally provided in the outer frame 13 a. Thus, the tip 13c of the pressing plate 13b that contacts the screen 11 is curved in the same manner as the curved wall 12a so that the screen 11 can be held in close contact with the curved wall 12a.
[0023]
In the present embodiment, when the hook-shaped portion 12 c is provided at the open edge of the receiving member 12, the hook-shaped portion 13 d is also provided in the holding member 13, and the holding member 13 is inserted into the holding member 12. The ridges 12c and 13d are overlapped with each other, and both the ridges 12c and 13d are detachably fixed using detachable fixing means such as screws (not shown). Therefore, the screen 11 can be replaced freely, and when the screen 11 is damaged, it can be replaced with a new screen 11.
[0024]
Since the screen unit 10 is configured as described above, the screen unit 10 is mounted in the vent port 8 so that the perforated plate-like curved wall 12a of the receiving member 12 is substantially flush with the inner wall surface 2b of the barrel 2. Then, the inner wall surface side opening of the barrel 2 of the vent port 8 is covered with the screen 11. As a result, the fine powder raw material in the barrel 2 does not pass, but mixed air and gas pass and flow into the forced exhaust chamber 20.
[0025]
If the gap between the perforated plate-shaped curved wall 12a and the flight outer peripheral surface of the screw 3 is set to 1 mm or less, the self-cleaning property of the curved wall 12a is improved.
[0026]
Then, operation | movement of the fine powder raw material supply apparatus by this Embodiment is demonstrated.
[0027]
During normal operation, the air supply valve 23 of each forced exhaust chamber 20 is closed and the exhaust valve 21 is opened to allow the exhaust duct 22 and the forced exhaust chamber 20 to communicate with each other, and is connected to the other end of the exhaust duct 22. Then, the forced exhaust chamber 20 is depressurized to a forced exhaust state.
[0028]
The pulverized raw material supplied to the hopper 4 enters the barrel 2 after a part of the air mixed from the gas vent 7 provided in the hopper 4 is forcibly exhausted, and is rotated by the two rotating screws 3. It is conveyed toward the discharge port 2a.
[0029]
When the fine powder raw material enters the barrel 2 from the hopper 4, the air in the hopper 4 is mixed and mixed into the fine powder raw material. The air mixed in the fine powder raw material of the screen unit 10 attached to each vent port 8. It passes through the mesh of the screen 11 and flows into the forced exhaust chamber 20 as indicated by the arrow, and is forcedly exhausted through the exhaust duct 22.
[0030]
As a result, the fine powder raw material conveyed in the barrel 2 toward the discharge port 2a is prevented from being reduced in bulk density due to air mixing, and the fine powder raw material transport capability of the fine powder raw material supply apparatus 1 is not reduced. A certain amount of fine raw material is stably supplied from the fine raw material supply port 44 of the type extruder 41.
[0031]
When the screen 11 is clogged, the exhaust valve 21 is closed and the air supply valve 23 is opened so that the air supply duct 24 and the forced exhaust chamber 20 are in communication with each other. Compressed air or inert gas is supplied instantaneously (pulse supply) into the forced exhaust chamber 20. Pressurized air or inert gas instantaneously supplied (pulsed) into the forced exhaust chamber 20 flows backward through the screen unit 10 and blows away fine powder material clogged in the screen 11 toward the barrel 2. That is, the screen is clogged by reverse cleaning.
[0032]
Needless to say, this reverse cleaning can be performed for each screen unit 10 of each vent port 8.
[0033]
Next, another embodiment of the fine powder raw material supply apparatus according to the present invention will be described. As shown in FIG. 5, the fine powder raw material supply apparatus 31 according to the present embodiment is provided with two vent ports 8 opposed to both side walls of the barrel 2 and two vent ports on the illustrated upper wall of the barrel 2. 8 and the barrel outer wall side opening of each vent port 8 communicates with the forced exhaust chamber 20. Other than this, since it is the same as the fine powder raw material supply apparatus according to the above-described embodiment, the description thereof is omitted.
[0034]
In each of the embodiments described above, the barrel 2 having two meshing screws is shown. However, the present invention is not limited to this, and the barrel 2 has one screw. Needless to say, the present invention can be applied to one having two non-meshing screws in the barrel 2.
[0035]
Further, the number of vent ports is not limited to two or four shown in the above-described embodiments, but can be changed to three or five or more as necessary.
[0036]
【The invention's effect】
Since this invention is comprised as mentioned above, there exists an effect as described below.
[0037]
In order to forcibly exhaust air or gas mixed in the fine powder raw material through a screen having a mesh smaller than the average particle diameter of the fine powder raw material of the screen unit installed in the vent port provided in the barrel, the bulk of the fine raw material in the barrel A decrease in density is prevented and a high transportation capacity can be maintained. As a result, downsizing is possible, and the fine powder raw material can be stably supplied to an extruder that mixes and extrudes the fine powder raw material with the polymer.
Further, since the pressing member is detachable in the receiving member, the screen can be exchanged.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a fine powder raw material supply apparatus according to an embodiment.
FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG.
3 is a schematic perspective view of the screen unit in the fine powder raw material supply apparatus shown in FIG.
4 is an exploded perspective view schematically showing the screen unit shown in FIG. 3. FIG.
FIG. 5 is an explanatory view of a fine raw material supply apparatus according to another embodiment.
FIG. 6 is an explanatory view showing an example of a conventional fine powder raw material supply apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 31 Fine powder raw material supply apparatus 2 Barrel 3 Screw 4 Hopper 5 Rotation drive mechanism 6 Cooling jacket 7 Degassing port 8 Vent port 10 Screen unit 11 Screen 12 Receiving member 12a Curved wall 12b Hole 12c Gutter-shaped portion 13 Pressing member 13a Outside Frame 13b Presser plate 13c Tip 20 Forced exhaust chamber 21 Exhaust valve 22 Exhaust duct 23 Exhaust duct 23 Inlet valve 24 Inlet duct 25, 27 Pressure gauge 26 Peep window 28 Level sensor 41 Extruder 42 Heating cylinder 43 Screw 44 Fine powder material Supply port

Claims (4)

ポリマーにかさ密度の小さい微粉原料を混合して押し出す押出機（４１）に、前記微粉原料を供給するための微粉原料供給装置（１、３１）であって、
前記微粉原料供給装置は、一端に前記押出機の加熱シリンダの側壁に設けられた微粉原料供給口（４４）に接続される吐出口（２ａ）を有するとともに他端側にホッパ（４）を有するバレル（２）と、前記バレル内に回転自在に配設されたスクリュ（３）と、前記スクリュを回転させる回転駆動機構（５）と、前記バレルにおける前記ホッパと前記吐出口間の壁に外壁面から内壁面へ貫通して設けられた少なくとも２個のベント口（８）と、前記ベント口のバレル外壁側開口部に連通された強制排気室（２０）と、前記ベント口内に装着されたスクリーンユニット（１０）とを備えており、
前記スクリーンユニットは、前記バレルの内壁面とほぼ同一面になる多孔板状の湾曲壁（１２ａ）および前記湾曲壁に相対する面が開放された箱状の受け部材（１２）と、前記湾曲壁を覆う前記微粉原料の平均粒径よりも小さい網目を有するスクリーン（１１）と、前記スクリーンを前記受け部材の前記湾曲壁に密着させるとともにベント流路を形成する格子状の押え板（１３ｂ）を有する押え部材（１３）とを備えたことを特徴とする微粉原料供給装置。A fine raw material supply device (1, 31) for supplying the fine raw material to an extruder (41) for mixing and extruding a fine raw material having a small bulk density to a polymer,
The fine powder raw material supply device has a discharge port (2a) connected to a fine powder raw material supply port (44) provided on a side wall of a heating cylinder of the extruder at one end and a hopper (4) at the other end side. A barrel (2), a screw (3) rotatably disposed in the barrel, a rotation drive mechanism (5) for rotating the screw, and an outer wall of the barrel between the hopper and the discharge port; at least two vent ports provided through the inner wall surface from the wall (8), the vent port of the barrel outer wall side opening communicated with the forced ventilation chamber (20), is attached to the vent in the opening Screen unit (10),
The screen unit includes a perforated plate-shaped curved wall (12a) that is substantially flush with the inner wall surface of the barrel, a box-shaped receiving member (12) having an open surface facing the curved wall, and the curved wall. A screen (11) having a mesh smaller than the average particle size of the fine powder raw material covering the grid, and a grid-like presser plate (13b) that closely contacts the curved wall of the receiving member and forms a vent channel A fine powder raw material supply device comprising a holding member (13) having a holding member. バレル（２）の壁に、冷却媒体を流す冷却用ジャケット（６）を内設したことを特徴とする請求項１記載の微粉原料供給装置。The fine powder raw material supply apparatus according to claim 1, wherein a cooling jacket (6) for flowing a cooling medium is provided in the wall of the barrel (2). 強制排気室（２０）に、給気用バルブ（２３）を介して給気用ダクト（２４）の一端側を接続し、前記給気用ダクトを介して加圧した空気または不活性ガスを瞬間供給してスクリーン（１１）の逆洗浄ができるように構成したことを特徴とする請求項１または２記載の微粉原料供給装置。One end of an air supply duct (24) is connected to the forced exhaust chamber (20) via an air supply valve (23), and pressurized air or inert gas is instantaneously supplied through the air supply duct. The fine powder raw material supply apparatus according to claim 1 or 2, wherein the fine powder raw material supply apparatus is configured to supply the screen (11) for back washing. 強制排気室（２０）に、内圧を検出するための圧力計（２５）を付設したことを特徴とする請求項１ないし３いずれか１項記載の微粉原料供給装置。The fine powder raw material supply device according to any one of claims 1 to 3, wherein a pressure gauge (25) for detecting an internal pressure is attached to the forced exhaust chamber (20).
JP2001008399A 2001-01-17 2001-01-17 Fine powder material supply equipment Expired - Lifetime JP3712185B2 (en)

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