JP4955795B2 - 造粒方法及び造粒装置 - Google Patents
造粒方法及び造粒装置 Download PDFInfo
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- JP4955795B2 JP4955795B2 JP2010111657A JP2010111657A JP4955795B2 JP 4955795 B2 JP4955795 B2 JP 4955795B2 JP 2010111657 A JP2010111657 A JP 2010111657A JP 2010111657 A JP2010111657 A JP 2010111657A JP 4955795 B2 JP4955795 B2 JP 4955795B2
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- pcw
- die
- circulation box
- pressure controller
- cutter blade
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- 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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/87—Cooling
Description
(2)プラスチック可塑化混練機101を起動し、ダイバータバルブ102から溶融プラスチック117を系外に排出して、プラスチック可塑化混練機101内の掃除(パージ)をする。
(3)ギヤポンプ103を起動し、ダイバータバルブ102をギヤポンプ103側に切り替え、溶融プラスチック117がダイス孔108から均一に押し出されることを確認する。
(4)ダイバータバルブ102を系外排出側に切り替え、ギヤポンプ103を停止する(この状態では、ダイバータバルブ102から溶融プラスチック117が排出されている状態である)。
(5)ダイス孔108から溶融プラスチック117が排出されない状態になるまで待ち、ダイス106のカッティング面を素早く清掃し、UWC装置107をダイス106と接続する。
(6)UWC装置107のモータ111を起動し、カッタ刃115を回転させる。
(7)回転しているカッタ刃115をダイス106に接触させる。
(8)PCW118がPCWポンプ126によりバイパス側で循環させている状態から、三方弁127を切り替えてUWC装置107の循環箱109に供給するようにする。
(9)ギヤポンプ103を起動し、ダイバータバルブ102をギヤポンプ103側に切り替え、溶融プラスチック117をダイス孔108から押出し、ペレット116を成形加工する。
(10)成形加工されたペレット116を、PCW118により脱水スクリーン123や遠心脱水機124に輸送し、ペレット116に付着したPCW118が取り除かれる。
(実施例1)
本実施の形態の造粒方法により本実施の形態の造粒装置を用いてダイス孔の開口率を測定した。溶融プラスチックの原料、UWC装置、ダイス、ダイス加熱温度、カッタ刃数、初期PCW温度、処理量、カッタ刃回転速度及びダイス直前上流側樹脂温度を以下に示す条件で評価を行った。
(MFR=0.25(230℃、2.16kg荷重))
UWC装置:株式会社日本製鋼所製 ADC−10型
ダイス:ヒートチャンネルダイス(孔径:φ2.5mm、孔数:24個)
ダイス加熱温度:300℃(オイル加熱、熱媒加熱装置の設定値)
カッタ刃数:6枚
初期PCW温度:60℃
処理量:380kg/h
カッタ刃回転数:2200rpm
ダイス直前上流側樹脂温度:213℃
ポリプロピレンのMFR値及びダイス直前上流側樹脂温度を図2に示す条件とした他は実施例1と同様の条件で造粒を行い、ダイス孔開口率を評価した。なお、実施例3では、実施例2の評価終了後UWC装置をダイスから分離せずにポリプロピレンの押出しを停止し、PCWを規定値まで排出して再度実施例2と同じ条件でペレットを評価した。これらの結果を図2に示す。
PCWを循環箱で加熱することなく、60℃のPCWを10m3/hの流量で造粒装置内に循環させた状態で図2に示す条件とした他は、実施例1と同様の条件で造粒を行い、ダイス孔開口率を評価した。これらの結果を図2に示す。なお、図2中、造粒方法Bは、前述の条件における従来の造粒方法を示す。
(実施例5)
溶融プラスチックの原料、UWC装置、ダイス、ダイス加熱温度、カッタ刃数、初期PCW温度、PCW加熱温度、処理量、カッタ刃回転数及びダイス直前上流側樹脂温度を以下に示す条件に設定した他は、実施例1と同様の方法で造粒してダイス孔の開口率を測定した。この結果を図3に示す。
UWC装置:株式会社日本製鋼所製 ADC−10型
ダイス:ヒートチャンネルダイス(孔径:φ2.5mm、孔数:56個)
ダイス加熱温度:300℃(オイル加熱、熱媒加熱装置の設定値)
カッタ刃数:4枚
初期PCW温度:60℃
PCW加熱温度:69℃
処理量:570kg/h
カッタ刃回転数:2100rpm
ダイス直前上流側樹脂温度:194℃
PCW加熱温度を図3に示す値に設定した他は実施例5と同様の条件で造粒を行い、ダイス孔開口率を評価した。これらの結果を図3及び4に示す。
Claims (14)
- ダイスの孔から押出された被処理媒体を循環箱に内在するカッタ刃で切断することにより造粒するとともに、該切断されたペレットをペレット冷却輸送水(PCW)により冷却しつつ循環箱から搬送するアンダーウォーターカット(UWC)装置を用いた造粒方法であって、
前記造粒を開始する前に、
前記PCWを循環させるとともに、前記カッタ刃を回転させながら前記ダイスに押し当てた後に前記PCWの循環を停止し、
前記PCWを排出して前記循環箱に所定量のPCWを貯留させ、
前記循環箱に貯留した前記PCWを69℃以上の温度に加熱する
ことを特徴とする造粒方法。 - 前記循環箱の上面と接続されている上部PCW配管に、少なくとも1個のPCW加熱温度検知器と、該PCW加熱温度検知器より上方に少なくとも2個のレベル検知器とを装備し、前記循環箱の底面に接続されている下部PCW配管に自動開閉ドレインバルブを装備するとともに、前記少なくとも2個のレベル検知器のうち、少なくとも1個のレベル検知器を他のレベル検知器より上方に配置し、
前記循環箱に所定量のPCWを貯留させる際、
前記自動開閉ドレインバルブを開放し、
前記少なくとも2個のレベル検知器によりPCWの水位を調整し、
前記少なくとも1個のPCW加熱温度検知器によりPCWの温度を管理する
ことを特徴とする請求項1に記載の造粒方法。 - 前記下部PCW配管にPCW圧力検知器を装備するとともに、前記カッタ刃を前後進させる前進圧制御器及び後退圧制御器とを装備し、
前記循環箱に所定量のPCWを貯留させる際、
前記PCW圧力検知器により検知された圧力に基づいて、前記前進圧制御器及び前記後退圧制御器、又は、前記前進圧制御器及び前記後退圧制御器のどちらか一方により前記カッタ刃がダイスと接触している力を調整することを特徴とする請求項2に記載の造粒方法。 - 前記PCWを69℃以上の温度に加熱して前記PCWを循環させる際、
前記PCW圧力検知器により検知された圧力に基づいて、前記前進圧制御器及び前記後退圧制御器、又は、前記前進圧制御器及び前記後退圧制御器のどちらか一方により前記カッタ刃がダイスと接触している力を調整することを特徴とする請求項3に記載の造粒方法。 - 前記少なくとも2個のレベル検知器の間隔を1m以下にすることを特徴とする請求項2乃至4のいずれかに記載の造粒方法。
- 前記下部PCW配管の前記循環箱に近い側から、前記自動開閉ドレインバルブ、手動開閉ドレインバルブの順に、各々を直列に配置することを特徴とする請求項2乃至5のいずれかに記載の造粒方法。
- 前記ペレットを循環箱から搬送した後、
前記PCWの循環を継続して該PCWの温度を低下させることを特徴とする請求項1乃至6のいずれかに記載の造粒方法。 - 前記ペレットを循環箱から搬送した後、
前記ダイスを加熱している加熱媒体が前記ダイスに流れないようにして、前記ダイスを前記PCWで冷却し、
前記UWC装置と前記ダイスとを切り離すことなく前記UWC装置を待機させることを特徴とする請求項7に記載の造粒方法。 - ダイスの孔から押出された被処理媒体を循環箱に内在するカッタ刃で切断することにより造粒するとともに、該造粒されたペレットをペレット冷却輸送水(PCW)により冷却しつつ循環箱から搬送するアンダーウォーターカット(UWC)装置を備えた造粒装置であって、
前記造粒を開始する前に、前記PCWを循環させるとともに、前記カッタ刃を回転させながら前記ダイスに押し当てた後に前記PCWの循環をバイパス側に切り換えるための三方弁と、
前記PCWを排出して所定量のPCWを貯留する前記循環箱と、
前記循環箱に貯留した前記PCWを69℃以上の温度に加熱するダイスと
を備えることを特徴とする造粒装置。 - 前記循環箱の上面と接続されている上部PCW配管に設けられた、少なくとも1個のPCW加熱温度検知器及び少なくとも2個のレベル検知器と、
前記循環箱の底面に接続されている下部PCW配管に接続された自動開閉ドレインバルブとを備え、
前記少なくとも2個のレベル検知器が前記少なくとも1個のPCW加熱温度検知器の上方に配置されるとともに、少なくとも1個のレベル検知器が他のレベル検知器より上方に配置されており、
前記循環箱に所定量のPCWを貯留させる際、前記自動開閉ドレインバルブを開放し、前記少なくとも2個のレベル検知器によりPCWの水位を調整し、前記少なくとも1個のPCW加熱温度検知器によりPCWの温度を管理する第1の制御部と
を備えることを特徴とする請求項9に記載の造粒装置。 - 前記下部PCW配管に備えられたPCW圧力検知器と、
前記カッタ刃を前後進させる前進圧制御器及び後退圧制御器と、
前記循環箱に所定量のPCWを貯留させる際、前記PCW圧力検知器により検知された圧力に基づいて、前記前進圧制御器及び前記後退圧制御器、又は、前記前進圧制御器及び前記後退圧制御器のどちらか一方により前記カッタ刃がダイスと接触している力を制御する第2の制御部と
を備えることを特徴とする請求項10に記載の造粒装置。 - 前記第2の制御部は、
前記PCWを69℃以上の温度に加熱して前記PCWを循環させる際、
前記PCW圧力検知器により検知された圧力に基づいて、前記前進圧制御器及び前記後退圧制御器、又は、前記前進圧制御器及び前記後退圧制御器のどちらか一方により前記カッタ刃がダイスと接触している力を制御する
ことを特徴とする請求項11に記載の造粒装置。 - 前記少なくとも2個のレベル検知器の間隔が1m以下であることを特徴とする請求項10乃至12のいずれかに記載の造粒装置。
- 前記下部PCW配管の前記循環箱に近い側から、前記自動開閉ドレインバルブ、手動開閉ドレインバルブの順に、各々が直列に配置されていることを特徴とする請求項10乃至13のいずれかに記載の造粒装置。
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