JPS6357219B2 - - Google Patents

Info

Publication number
JPS6357219B2
JPS6357219B2 JP58116001A JP11600183A JPS6357219B2 JP S6357219 B2 JPS6357219 B2 JP S6357219B2 JP 58116001 A JP58116001 A JP 58116001A JP 11600183 A JP11600183 A JP 11600183A JP S6357219 B2 JPS6357219 B2 JP S6357219B2
Authority
JP
Japan
Prior art keywords
screw
section
extruder
resin
recut
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
Application number
JP58116001A
Other languages
Japanese (ja)
Other versions
JPS609727A (en
Inventor
Nobuhisa Kobayashi
Minoru Yoshida
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.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works 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 Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP58116001A priority Critical patent/JPS609727A/en
Publication of JPS609727A publication Critical patent/JPS609727A/en
Publication of JPS6357219B2 publication Critical patent/JPS6357219B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • 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
    • B29C48/268—Throttling of the flow, e.g. for cooperating with plasticising elements or for degassing
    • 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
    • B29C48/41—Intermeshing counter-rotating screws
    • 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
    • B29C48/505—Screws
    • B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
    • 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
    • B29C48/505—Screws
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis
    • 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
    • B29C48/505—Screws
    • B29C48/57—Screws provided with kneading disc-like elements, e.g. with oval-shaped elements
    • 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
    • B29C48/505—Screws
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
    • 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
    • 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • 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
    • B29C48/762—Vapour stripping

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)

Description

【発明の詳細な説明】 本発明は二軸混練押出機の改善に関するもので
あるが、スクリユーに独自の設計を加えたもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a twin-screw kneading extruder, in which a unique design is added to the screw.

合成樹脂成形用の二軸押出機のスクリユーは材
料供給口たるホツパーに近い供給部、次いで混練
部、更に計量化部となつている。しかして、従来
樹脂中の揮発物の脱気のため供給部或は混練部に
おいて水を注入し、この注入された水と高温の樹
脂とを充分に混練し、樹脂中に含まれている揮発
物を水蒸気とともに混練部前方（下流側）に設け
たベントから排出する方法が採用されている。し
かしながら、従来の押出機スクリユーはスクリユ
ー軸の供給部及び混練部の全長に亘りスクリユー
溝、即ちスクリユーフライトが設けられている。
ところで、スクリユー軸の回転によつて樹脂には
前方（下流側）への推進力が付与されるが、注入
された水が気化し、これが一部逆流しホツパーに
迄至ることがある。そのため樹脂原料の供給が妨
げられ、また樹脂の流れが不安定となり押出機の
運転が安定せずサージング現象を起こし、更には
一旦可塑化溶融した樹脂がホツパー部で固化する
等の欠点が存していた。 The screw of a twin-screw extruder for molding synthetic resins has a feed section close to the hopper, which is the material feed port, then a kneading section, and then a metering section. Conventionally, water is injected in the supply section or kneading section to degas the volatiles in the resin, and the injected water and high-temperature resin are sufficiently kneaded to remove the volatiles contained in the resin. A method is adopted in which the material is discharged along with water vapor from a vent provided in front (downstream side) of the kneading section. However, the conventional extruder screw is provided with a screw groove, that is, a screw flight, over the entire length of the feeding section and the kneading section of the screw shaft.
Incidentally, the rotation of the screw shaft imparts a forward (downstream) propulsion force to the resin, but the injected water may vaporize and some of this may flow backwards and reach the hopper. As a result, the supply of resin raw materials is obstructed, the flow of the resin becomes unstable, the operation of the extruder becomes unstable and surging occurs, and furthermore, the plasticized and molten resin solidifies in the hopper. was.

本発明は従来の押出機の上記欠点を克服するこ
とを目的としたものである。本発明に係る二軸混
練押出機は、そのスクリユーに押出機の水注入口
より上流側において、一部スクリユーフライトを
設けず、スクリユー溝外径に等しい丸棒状の部分
を設けたことを特徴とする（以下、この部分をリ
カツト部分という）。即ち、供給部より前進せし
められ一部可塑化溶融した樹脂は、このリカツト
部分で推進力を弱められ滞留することとなるが、
その際押出機シリンダー内面とリカツト部分スク
リユー軸外面との間に形成されるドーナツ状の空
間に樹脂が充満する。そして供給部上流側より該
空間に押出された樹脂の量に応じて、該空間より
樹脂が更に前進する。したがつて、リカツト部分
の該空間には一部可塑化溶融した樹脂が常に充満
している。そのため押出機シリンダー内面と回転
するスクリユーとの間にベアリング効果を生ずる
こととなり、スクリユーのかじり現象を回避でき
るばかりでなく、下流側にて注入・気化した水蒸
気の上流側への逆流を防止することができる。そ
の結果上記した従来装置の欠点を解消することが
でき、押出機の運転が安定したものとなる。 The present invention aims to overcome the above-mentioned drawbacks of conventional extruders. The twin-screw kneading extruder according to the present invention is characterized in that a part of the screw is not provided with a screw flight on the upstream side of the water inlet of the extruder, and a round bar-shaped part is provided that is equal to the outer diameter of the screw groove. (Hereinafter, this part will be referred to as the recut part). In other words, the partially plasticized and molten resin that is advanced from the supply section has its driving force weakened and remains in the recut section, but
At this time, the donut-shaped space formed between the inner surface of the extruder cylinder and the outer surface of the screw shaft of the recut portion is filled with resin. The resin further advances from the space in accordance with the amount of resin extruded into the space from the upstream side of the supply section. Therefore, the space in the recut portion is always filled with partially plasticized and molten resin. Therefore, a bearing effect is created between the inner surface of the extruder cylinder and the rotating screw, which not only avoids the galling phenomenon of the screw, but also prevents water vapor injected and vaporized on the downstream side from flowing back upstream. I can do it. As a result, the above-mentioned drawbacks of the conventional apparatus can be overcome, and the operation of the extruder becomes stable.

以下、本発明の実施例につき説明する。第１図
は異方向二軸噛み合い型押出機の正断面図であ
る。リカツト部分８は、スクリユー供給部５と混
練部６との間に、また水注入口１１は混練部上流
端にそれぞれ設けられている。２はホツパー、３
は脱気用ベントで、７はスクリユー計量化部であ
る。ホツパー２に供給された樹脂原料は供給部５
にてかくはん前進せしめられ一部可塑化溶融し、
次いでリカツト部分８に滞留充満し、更に混練部
６、計量化部７を経て押出される。一方水注入口
１１が混練部６の上流端に設けてあり、注入され
た水は押出機内にて気化し、樹脂中に含まれてい
る揮発物とともに脱気ベント３より排出される。
本実施例によれば上記した従来装置の欠点を回避
できるが、スクリユー駆動軸に回転力を付与する
主電動機の電流値の変動をみると、従来装置では
第３図に示すように電流の振巾が大きく運転が極
めて不安定であるが、本実施例ではリカツト部分
のベアリング効果により電流値の変動は第４図に
示すように極めて小さく安定している。 Examples of the present invention will be described below. FIG. 1 is a front sectional view of a twin-screw meshing extruder in opposite directions. The recut portion 8 is provided between the screw supply section 5 and the kneading section 6, and the water inlet 11 is provided at the upstream end of the kneading section. 2 is hopper, 3
is a degassing vent, and 7 is a screw metering section. The resin raw material supplied to the hopper 2 is supplied to the supply section 5
It is stirred and moved forward to partially plasticize and melt.
Then, it stays and fills the recut section 8, and is further extruded through the kneading section 6 and the metering section 7. On the other hand, a water inlet 11 is provided at the upstream end of the kneading section 6, and the injected water is vaporized within the extruder and discharged from the deaeration vent 3 together with volatile substances contained in the resin.
According to this embodiment, the above-mentioned drawbacks of the conventional device can be avoided, but when looking at the fluctuations in the current value of the main motor that applies rotational force to the screw drive shaft, the conventional device shows the current fluctuation as shown in Fig. 3. Although the width is large and the operation is extremely unstable, in this embodiment, due to the bearing effect of the recut portion, the fluctuation in the current value is extremely small and stable as shown in FIG.

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

第１図は異方向噛み合い型押出機の正断面図、
第２図は第１図の−線断面図、第３図は従来
装置の主電動機の電流値の変化を示すグラフ、第
４図は本発明実施例の同変化を示すグラフであ
る。 １……押出機、２……ホツパー、３……脱気用
ベント、５……スクリユー供給部、６……スクリ
ユー混練部、７……スクリユー計量化部、８……
スクリユーリカツト部分、１１……水注入口。 Figure 1 is a front sectional view of the opposite direction meshing type extruder.
2 is a sectional view taken along the line -- in FIG. 1, FIG. 3 is a graph showing changes in the current value of the main motor of the conventional device, and FIG. 4 is a graph showing the same changes in the embodiment of the present invention. 1... Extruder, 2... Hopper, 3... Degassing vent, 5... Screw supply section, 6... Screw kneading section, 7... Screw metering section, 8...
Screw lily cut part, 11...water inlet.

Claims (1)

【特許請求の範囲】[Claims] １ 二軸混練押出機において、押出機水注入位置
より上流側のスクリユーの部分長に亘り、リカツ
ト部分を設けたことを特徴とする改良型二軸混練
押出機。1. An improved twin-screw kneading extruder, characterized in that a recut portion is provided over the length of the screw upstream from the extruder water injection position.
JP58116001A 1983-06-29 1983-06-29 Improved twin-screw kneading extruder Granted JPS609727A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58116001A JPS609727A (en) 1983-06-29 1983-06-29 Improved twin-screw kneading extruder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58116001A JPS609727A (en) 1983-06-29 1983-06-29 Improved twin-screw kneading extruder

Publications (2)

Publication Number Publication Date
JPS609727A JPS609727A (en) 1985-01-18
JPS6357219B2 true JPS6357219B2 (en) 1988-11-10

Family

ID=14676380

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58116001A Granted JPS609727A (en) 1983-06-29 1983-06-29 Improved twin-screw kneading extruder

Country Status (1)

Country Link
JP (1) JPS609727A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3023435U (en) * 1995-10-03 1996-04-16 株式会社三裕商会 Seat cover storage case

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223119A (en) * 1984-04-20 1985-11-07 Hitachi Ltd Noncontacting driving type precise moving base
JPS63122114U (en) * 1987-02-03 1988-08-09
IT1246782B (en) * 1991-04-15 1994-11-26 Pomini Farrel Spa THERMOPLASTIC AND SIMILAR POLYMER EXTRUSION MACHINE INCLUDING AN INTERNAL MIXER.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51566A (en) * 1974-06-25 1976-01-06 Japan Steel Works Ltd 2 jikubentogataoshidashiki

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51566A (en) * 1974-06-25 1976-01-06 Japan Steel Works Ltd 2 jikubentogataoshidashiki

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3023435U (en) * 1995-10-03 1996-04-16 株式会社三裕商会 Seat cover storage case

Also Published As

Publication number Publication date
JPS609727A (en) 1985-01-18

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