JPH08174638A - Extrusion molding method of thermoplastic resin - Google Patents

Extrusion molding method of thermoplastic resin

Info

Publication number
JPH08174638A
JPH08174638A JP6337201A JP33720194A JPH08174638A JP H08174638 A JPH08174638 A JP H08174638A JP 6337201 A JP6337201 A JP 6337201A JP 33720194 A JP33720194 A JP 33720194A JP H08174638 A JPH08174638 A JP H08174638A
Authority
JP
Japan
Prior art keywords
gear pump
pressure
mold
extruder
back pressure
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.)
Withdrawn
Application number
JP6337201A
Other languages
Japanese (ja)
Inventor
Shoichi Azuma
正一 東
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diafoil Co Ltd
Original Assignee
Diafoil Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Diafoil Co Ltd filed Critical Diafoil Co Ltd
Priority to JP6337201A priority Critical patent/JPH08174638A/en
Publication of JPH08174638A publication Critical patent/JPH08174638A/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B29C48/375—Plasticisers, homogenisers or feeders comprising two or more stages
    • B29C48/387—Plasticisers, homogenisers or feeders comprising two or more stages using a screw extruder and a gear pump
    • 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
    • B29C48/365—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pumps, e.g. piston pumps
    • B29C48/37—Gear pumps
    • 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
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/9239—Screw or gear
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids

Landscapes

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

Abstract

PURPOSE: To prevent the raising of a molten resin in a vent hole due to the instability of the supply of a stock resin from occurring by a method wherein a gear pump is arranged between a vented extruder and a mold and the back pressure of the gear pump is controlled to be kept constant. CONSTITUTION: Stock flakes are quantitatively fed by a constant delivery feeder 1. As a vented extruder 2, an equidirectionally rotating twin-screw extruder is preferably employed. A molten resin, the pressure of which is raised with a gear pump 4 by ΔP in the range of 15-100kg/cm<2> G is passed through a filter 5 and a mold 6 so as to be molded into a columnar article. In this case, the back pressure of the gear pump 4 is controlled to be kept constant. Concretely, the controlling of the back pressure is performed by controlling the rotational frequency of the driving motor 4a of the gear pump 4 by a pressure controller 12 so as to make the pressure, which is measured by a pressure sensor 11 arranged in a flow path ranging from the vented extruder 2 to the gear pump 4, constant.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、熱可塑性樹脂の押出成
形方法に関するものであり、詳しくは、熱可塑性樹脂フ
ィルムの製造工程で発生するスクラップフィルムの粉砕
物（フレーク）を原料とする工業的有利な押出成形方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extrusion-molding a thermoplastic resin, and more specifically, an industrial method using a crushed material (flakes) of a scrap film generated in a manufacturing process of a thermoplastic resin film as a raw material. It relates to an advantageous extrusion method.

【０００２】[0002]

【従来の技術】従来、熱可塑性樹脂の押出成形方法にお
いては、溶融押出装置として、ベント付押出機が用いら
れている。ベント付押出機を利用するならば、ベント口
を負圧にすることにより、溶融樹脂中の水分を除去する
ことが出来るため、原料の乾燥装置を省略し得る利点が
ある。2. Description of the Related Art Conventionally, in a thermoplastic resin extrusion molding method, a vented extruder is used as a melt extrusion apparatus. If an extruder with a vent is used, the moisture in the molten resin can be removed by setting a negative pressure in the vent port, which has the advantage of omitting the drying device for the raw material.

【０００３】[0003]

【発明が解決しようとする課題】ところで、従来の押出
成形方法では、原料として、例えば、見掛比重が０．０
５ｇ／cc前後の熱可塑性樹脂粉砕物、具体的には、超薄
番手ポリエステルフィルム（数μｍ以下）の製造工程で
発生するスクラップフィルムの粉砕物を用いた場合に
は、次の様な問題が発生する。By the way, in the conventional extrusion molding method, for example, the apparent specific gravity is 0.0
When using a crushed product of a thermoplastic resin of about 5 g / cc, specifically, a crushed product of a scrap film generated in the manufacturing process of an ultra-thin polyester film (several μm or less), the following problems occur. appear.

【０００４】すなわち、原料の押出機に対する喰い込み
が悪くて供給量が安定しないため、押出機の背圧が不安
定となり、口金より突出される柱状物の寸法が不均一と
なるばかりか、特に、過剰供給の場合は、押出機の背圧
が急激に上昇し、ベント口に溶融樹脂が上昇して連続運
転が不可能となる。That is, since the feed of the raw material into the extruder is bad and the supply amount is not stable, the back pressure of the extruder becomes unstable, and not only the size of the columnar piece protruding from the die becomes uneven, but also in particular. In the case of excessive supply, the back pressure of the extruder rises sharply and the molten resin rises in the vent port, making continuous operation impossible.

【０００５】本発明者は、上記実情に鑑みなされたもの
であり、その目的は、ベント付押出機を用い、熱可塑性
樹脂の粉砕物を原料とする押出成形方法であって、原料
樹脂の供給量の不安定に伴って生じるベント口への溶融
樹脂の上昇などの問題を解決した工業的に有利な押出成
形方法を提供することにある。The present inventor has been made in view of the above circumstances, and an object thereof is an extrusion molding method using a crushed product of a thermoplastic resin as a raw material by using an extruder with a vent, and supplying the raw material resin. It is an object of the present invention to provide an industrially advantageous extrusion molding method that solves the problems such as the rise of the molten resin to the vent port due to the instability of the amount.

【０００６】[0006]

【課題を解決するための手段】すなわち、本発明の要旨
は、熱可塑性樹脂の粉砕物を金型内に溶融押し出しして
柱状物を成形するに当り、溶融押出装置として、ベント
付押出機を用い、当該ベント付押出機と金型の間にギヤ
ポンプを配置し、当該ギヤポンプの背圧を一定に制御す
ることを特徴とする熱可塑性樹脂の押出成形方法に存す
る。Means for Solving the Problems That is, the gist of the present invention is to use a vented extruder as a melt extruder for melt extrusion of a pulverized product of a thermoplastic resin into a mold to form a columnar product. The present invention also relates to an extrusion molding method of a thermoplastic resin, characterized in that a gear pump is arranged between the extruder with the vent and a mold, and the back pressure of the gear pump is controlled to be constant.

【０００７】以下、図１に示す系統図に従って本発明を
詳細に説明する。本発明方法においては、例えば、熱可
塑性樹脂フィルムの製造工程で発生するスクラップフィ
ルムの粉砕物（フレーク）を原料とする。斯かる原料フ
レークとしては、数μｍ以下の超薄番手ポリエステルフ
ィルムの製造工程で発生する、いわゆる耳部フィルムの
粉砕物などが挙げられる。この様な粉砕物は、通常、見
掛比重が０．０５ｇ／ｃｃ前後である。The present invention will be described in detail below with reference to the system diagram shown in FIG. In the method of the present invention, for example, a crushed material (flakes) of a scrap film generated in the thermoplastic resin film manufacturing process is used as a raw material. Examples of such raw material flakes include crushed products of so-called ear films, which are generated in the manufacturing process of ultra-thin polyester film having a thickness of several μm or less. The apparent specific gravity of such a pulverized product is usually around 0.05 g / cc.

【０００８】原料フレークは、定容量フィーダー（１）
により、ベント付押出機（２）に定量供給される。ベン
ト付押出機（２）としては、同方向２軸押出機が好適に
用いられ、その回転数は、通常１００〜４００ｒｐｍ、
好ましくは２００〜３００ｒｐｍとされ、押し出し量
は、通常１５０〜６００Ｋｇ／ｈｒ好ましくは２００〜
４００Ｋｇ／ｈｒ. 背圧は、通常５〜４０ｋｇ／ｃｍ2
Ｇとするのがよい。また、溶融温度は樹脂の種類によっ
ても異なるが、ポリエステル樹脂の場合は、通常、２７
０〜３１０℃である。The raw material flakes have a constant volume feeder (1).
By this, a fixed amount is supplied to the extruder (2) with a vent. As the vented extruder (2), the same-direction twin-screw extruder is preferably used, and the rotation speed is usually 100 to 400 rpm,
It is preferably 200 to 300 rpm, and the extrusion amount is usually 150 to 600 Kg / hr, preferably 200 to 300 rpm.
400Kg / hr. Back pressure, usually 5~40kg / cm 2
Good is G. Although the melting temperature varies depending on the type of resin, in the case of polyester resin, it is usually 27
It is 0-310 degreeC.

【０００９】ベント付押出機（２）には、真空ポンプ
（３）が連結されており、押出機中で溶融押し出しされ
る樹脂は、真空ポンプ（３）により脱気され、水分が除
去される。真空度は、通常５０トール以下、好ましくは
２０トール以下とされ、原料樹脂の水分は、ベント付押
出機（２）において、通常、０．４％から０．００５％
程度まで減少させられる。A vacuum pump (3) is connected to the vented extruder (2), and the resin melt-extruded in the extruder is degassed by the vacuum pump (3) to remove water. . The degree of vacuum is usually 50 Torr or less, preferably 20 Torr or less, and the water content of the raw material resin is usually 0.4% to 0.005% in the vented extruder (2).
Can be reduced to a degree.

【００１０】溶融樹脂は、ギヤポンプ（４）により、Δ
Ｐ１５〜１００ｋｇ／ｃｍ2 Ｇの範囲まで昇圧された
後、フィルター（５）、金型( 6 ) を通して柱状物に成
形される。柱状物は、その後、冷却工程（冷却水槽）
（７）にて冷却固化された後、ストランドとして、引取
ロール（８）によってストランドカッター（９）に供給
され、チップ状に切断される。なお、図１中の符号（１
０）は、引取ロール（８）及びストランドカッター
（９）に共用されている可変速駆動モータである。これ
らの各設備は、従来公知のものを用いることが出来る。The molten resin is fed to the gear pump (4) by Δ
After the pressure is increased to a range of P15 to 100 kg / cm 2 G, a columnar product is formed through the filter (5) and the mold (6). Columns are then cooled (cooling water tank)
After being cooled and solidified in (7), it is supplied as a strand to the strand cutter (9) by the take-up roll (8) and cut into chips. The reference numeral (1
0) is a variable speed drive motor shared by the take-up roll (8) and the strand cutter (9). Conventionally known equipment can be used for each of these facilities.

【００１１】本発明の特徴は、ギヤポンプ（４）の背圧
を一定に制御する点にある。背圧の制御は、ベント付押
出機（２）とギヤポンプ（４）との間の流路に圧力セン
サー（１１）を配置し、この圧力が一定となる様に、圧
力コントローラ（１２）によってギヤポンプ駆動モータ
（４ａ）の回転数を制御することにより行う。その結
果、本発明によれば、ギヤポンプ（４）の背圧の急激な
上昇は発生せず、ベント付押出機（２）のベント口に溶
融樹脂が上昇して連続運転が不可能となることはない。The feature of the present invention resides in that the back pressure of the gear pump (4) is controlled to be constant. To control the back pressure, a pressure sensor (11) is arranged in the flow path between the vented extruder (2) and the gear pump (4), and a pressure controller (12) is used to keep the pressure constant. This is performed by controlling the rotation speed of the drive motor (4a). As a result, according to the present invention, the back pressure of the gear pump (4) does not suddenly rise, and the molten resin rises in the vent port of the vented extruder (2), making continuous operation impossible. There is no.

【００１２】上記の様にギヤポンプ（４）の背圧を一定
に制御した場合、金型( 6 ) から突出される溶融樹脂量
が変動する。そこで、本発明においては、図２に示す様
に、ギヤポンプ駆動モータ（４ａ）に機械的に連結され
たパルスジェネレータ（１３）の信号を比率コントロー
ラ（１４）に取り込み、比率演算を行ってストランド引
取ロール（８）及びストランドカッター（９）に共用さ
れている可変速駆動モータ（１０）を制御するのが好ま
しい。When the back pressure of the gear pump (4) is controlled to be constant as described above, the amount of molten resin projected from the mold (6) varies. Therefore, in the present invention, as shown in FIG. 2, the signal of the pulse generator (13) mechanically connected to the gear pump drive motor (4a) is taken into the ratio controller (14), and the ratio calculation is performed to take the strand. It is preferable to control a variable speed drive motor (10) shared by the roll (8) and the strand cutter (9).

【００１３】すなわち、ギヤポンプ（４）の定量性を利
用し、同回転数を上記の駆動モータ（１０）にフィード
フォワードすることにより、金型( 6 ) から突出される
溶融樹脂量の変動に伴うチップの寸法精度（直径と長
さ）の向上を図るのが好ましい。勿論、引取ロール
（８）及びストランドカッター（９）に独立の駆動モー
タを用い、引取ロール（８）の引取速度のみを制御して
ストランドの直径のみの寸法精度を向上させることも出
来る。That is, by utilizing the quantitative property of the gear pump (4) and feeding the same rotational speed to the drive motor (10), the amount of molten resin projected from the mold (6) is changed. It is preferable to improve the dimensional accuracy (diameter and length) of the chip. Of course, independent drive motors may be used for the take-up roll (8) and the strand cutter (9), and only the take-up speed of the take-up roll (8) may be controlled to improve the dimensional accuracy of only the strand diameter.

【００１４】[0014]

【実施例】以下、本発明を実施例により更に詳細に説明
する。図１に示の系統図に示す方法に従い、原料とし
て、約２μｍのポリエステルフィルムのスクラップを粉
砕機にて３mm以下の粒度に粉砕したフレーク（見掛比
重：約０．０５ｇ／ｃｃ）を用いて押出成形を行った。
押出成形された柱状物を冷却水槽中に導入して冷却固化
した後、ストランドカッタにてチップ状に切断した。The present invention will be described in more detail with reference to the following examples. According to the method shown in the system diagram shown in FIG. 1, flakes (apparent specific gravity: about 0.05 g / cc) obtained by crushing polyester film scrap of about 2 μm to a particle size of 3 mm or less by a crusher were used as a raw material. Extrusion was performed.
The extruded columnar material was introduced into a cooling water tank, cooled and solidified, and then cut into chips by a strand cutter.

【００１５】そして、ベント付押出機（２）とギヤポン
プ（４）との間の流路に圧力センサー（１１）を配置
し、この圧力が一定となる様に圧力コントローラ（１
２）によってギヤポンプ駆動モータ（４ａ）の回転数を
制御した。また、ギヤポンプ駆動モータ（４ａ）に機械
的に連結されたパルスジェネレータ（１３）の信号を比
率コントローラ（１４）に取込み、比率演算を行ってス
トランド引取ロール（８）及びストランドカッター
（９）の共用駆動モータ（１０）の回転数を制御した。A pressure sensor (11) is arranged in the flow path between the vented extruder (2) and the gear pump (4), and the pressure controller (1) is arranged so that the pressure becomes constant.
The rotation speed of the gear pump drive motor (4a) was controlled by 2). Further, the signal of the pulse generator (13) mechanically connected to the gear pump drive motor (4a) is taken into the ratio controller (14), the ratio is calculated, and the strand take-up roll (8) and the strand cutter (9) are commonly used. The rotation speed of the drive motor (10) was controlled.

【００１６】定容量精度１％以下の定容量フィーダー
（１）で原料フレークをベント付２軸溶融押出機（２）
（同方向２軸押出機）に供給した。条件は表１に示す次
の通りである。A twin-screw extruder (2) with a vent for raw material flakes in a constant-volume feeder (1) having a constant-volume accuracy of 1% or less.
(Biaxial extruder in the same direction). The conditions are as shown in Table 1.

【００１７】[0017]

【表１】 回転数 ：２６０ｒｐｍ 溶融温度 ：２８０℃ 押出量 ：２５０ｋｇ／ｈｒ 真空度 ：２０トール以下 含水率 ：入口０．４％ＷＢ→出口０．００５％ＷＢ 背 圧 ：１０ｋｇ／ｃｍ2 Ｇ[Table 1] Rotation speed: 260 rpm Melting temperature: 280 ° C. Extrusion rate: 250 kg / hr Vacuum degree: 20 Torr or less Moisture content: 0.4% WB at inlet → 0.005% WB at outlet Back pressure: 10 kg / cm 2 G

【００１８】その後、ギヤポンプ（４）により、ΔＰ約
２３ｋｇ／ｃｍ2 Ｇの昇圧を行ない、フィルター（５）
でロ過した後、金型（６）を通して柱状物に成形し、冷
却工程（７）で冷却固化してストランドを得、ストラン
ド引取ロール（８）を通してストランドカッター（９）
に供給してチップ状に切断した。長期間の連続運転によ
ってもベント付２軸溶融押出機（２）のベント口への溶
融樹脂の上昇はなく安定した成形を行うことが出来た。
また、得られたチップの寸法精度も良好であった。Thereafter, the gear pump (4) boosts the pressure of ΔP about 23 kg / cm 2 G, and the filter (5)
After being filtered with a mold, the product is molded into a columnar product through a mold (6), cooled and solidified in a cooling step (7) to obtain a strand, and a strand cutter (9) is passed through a strand take-up roll (8).
And was cut into chips. Even after continuous operation for a long time, the molten resin did not rise to the vent port of the twin-screw melt extruder with a vent (2), and stable molding could be performed.
The dimensional accuracy of the obtained chip was also good.

【００１９】なお、比較のために、ギヤポンプ（４）の
背圧制御を中止した結果、ベント付２軸溶融押出機への
原料フレークの喰い込みが悪くて押出量が大きく変化
し、ベント口への溶融樹脂の上昇が起こり始めた。従っ
て、安定した連続運転は不可能であった。For the purpose of comparison, as a result of stopping the back pressure control of the gear pump (4), the raw material flakes do not easily feed into the twin-screw extruder with a vent, and the extrusion rate changes greatly, leading to the vent port. The rise of molten resin in Therefore, stable continuous operation was impossible.

【００２０】[0020]

【発明の効果】以上説明した本発明によれば、原料とし
て見掛比重の極めて小さい樹脂粉砕物を用いるにも拘わ
らず、安定した溶融押し出しを実施し得る。EFFECTS OF THE INVENTION According to the present invention described above, stable melt extrusion can be carried out even though a crushed resin having an extremely small apparent specific gravity is used as a raw material.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明方法を実施するための系統図である。FIG. 1 is a system diagram for carrying out the method of the present invention.

【図２】本発明の好ましい実施態様における制御系統の
説明図である。FIG. 2 is an explanatory diagram of a control system according to a preferred embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１：定容量フィーダー ２：ベント付押出機 ３：真空ポンプ、 ４：ギヤポンプ ４ａ：ギヤポンプ駆動モータ ５：フィルター ６：金型 ７：冷却工程 ８：ストランド引取ロール ９：ストランドカッター １０：駆動モータ １１：圧力センサー １２：圧力コントローラ １３：パルスジェネレータ １４：比率コントローラ 1: Constant capacity feeder 2: Vented extruder 3: Vacuum pump, 4: Gear pump 4a: Gear pump drive motor 5: Filter 6: Mold 7: Cooling process 8: Strand take-up roll 9: Strand cutter 10: Drive motor 11: Pressure sensor 12: Pressure controller 13: Pulse generator 14: Ratio controller

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 105:26 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29K 105: 26

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 熱可塑性樹脂の粉砕物を金型内に溶融押
し出しして柱状物を成形するに当り、溶融押出装置とし
て、ベント付押出機を用い、当該ベント付押出機と金型
の間にギヤポンプを配置し、当該ギヤポンプの背圧を一
定に制御することを特徴とする熱可塑性樹脂の押出成形
方法。1. When a crushed product of a thermoplastic resin is melt-extruded into a mold to form a columnar product, a vented extruder is used as a melt extrusion device, and the vented extruder and the mold are connected to each other. A method for extruding a thermoplastic resin, comprising: arranging a gear pump in the base and controlling a back pressure of the gear pump to be constant. 【請求項２】 金型から溶融押し出しされた柱状物を冷
却した後、得られたストランドをストランド引取ロール
を通してストランドカッターに供給してチップ状に切断
すると共に、ギヤポンプの背圧制御によって変動するギ
ヤポンプの駆動モータの回転数により、ストランド引取
ロール及び／又はストランドカッターの駆動モータをフ
ィードフォワード制御する請求項１に記載の押出成形方
法。2. A gear pump that cools a columnar member melt-extruded from a mold, supplies the obtained strand to a strand cutter through a strand take-up roll to cut it into chips, and fluctuates by controlling the back pressure of the gear pump. The extrusion molding method according to claim 1, wherein the drive motor for the strand take-up roll and / or the strand cutter is feed-forward controlled by the rotation speed of the drive motor.
JP6337201A 1994-12-26 1994-12-26 Extrusion molding method of thermoplastic resin Withdrawn JPH08174638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6337201A JPH08174638A (en) 1994-12-26 1994-12-26 Extrusion molding method of thermoplastic resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6337201A JPH08174638A (en) 1994-12-26 1994-12-26 Extrusion molding method of thermoplastic resin

Publications (1)

Publication Number Publication Date
JPH08174638A true JPH08174638A (en) 1996-07-09

Family

ID=18306394

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6337201A Withdrawn JPH08174638A (en) 1994-12-26 1994-12-26 Extrusion molding method of thermoplastic resin

Country Status (1)

Country Link
JP (1) JPH08174638A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10323831A (en) * 1997-05-26 1998-12-08 Diafoil Co Ltd Production of polyester composition
JP2004527404A (en) * 2001-05-30 2004-09-09 レーム ゲゼルシャフト ミツト ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト Method and apparatus for pressure regulation in vented single screw or cascade extruders
CN102001175A (en) * 2010-09-27 2011-04-06 张家港市民扬塑胶科技有限公司 Plastic extruder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10323831A (en) * 1997-05-26 1998-12-08 Diafoil Co Ltd Production of polyester composition
JP2004527404A (en) * 2001-05-30 2004-09-09 レーム ゲゼルシャフト ミツト ベシュレンクテル ハフツング ウント コンパニー コマンディートゲゼルシャフト Method and apparatus for pressure regulation in vented single screw or cascade extruders
CN102001175A (en) * 2010-09-27 2011-04-06 张家港市民扬塑胶科技有限公司 Plastic extruder

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