JPS6215328B2 - - Google Patents
Info
- Publication number
- JPS6215328B2 JPS6215328B2 JP53046784A JP4678478A JPS6215328B2 JP S6215328 B2 JPS6215328 B2 JP S6215328B2 JP 53046784 A JP53046784 A JP 53046784A JP 4678478 A JP4678478 A JP 4678478A JP S6215328 B2 JPS6215328 B2 JP S6215328B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- barrel
- vent
- tip
- resin
- 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
Links
- 229920005989 resin Polymers 0.000 claims description 28
- 239000011347 resin Substances 0.000 claims description 28
- 238000001125 extrusion Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/55—Screws having reverse-feeding 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
- B29C48/395—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
- B29C48/36—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
- B29C48/405—Intermeshing co-rotating screws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は熱硬化性樹脂の押出成形用の多軸ベン
ト押出機に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-screw vent extruder for extrusion of thermosetting resins.
熱硬化性樹脂を連続的に安定した押出成形する
ことは熱可塑性樹脂に比べ成形性が難しくその範
囲は限定されていた。即ち、熱硬化性樹脂特有の
溶融時における粘着の強さが押圧力を高くし、そ
れ起因する発熱によつて硬化反応が起き易い等の
欠点があつた。また熱可塑性樹脂と比べ適正温度
に保つ許容範囲が狭いのも前記発熱の１原因とな
つている。従つて、その成形方法も原料樹脂に対
する充填材を予備的にブレンドし、バツチ方式で
送り込み圧縮成形をするか、電気部品等の小物品
を射出成形等により成形する程度で押出成形分野
ではそれ程普及率は高くない。 Continuous and stable extrusion molding of thermosetting resins is difficult compared to thermoplastic resins, and the range of extrusion molding is limited. That is, the adhesive strength characteristic of thermosetting resins during melting increases the pressing force, and the resulting heat generation tends to cause a curing reaction. Another reason for the heat generation is that the allowable range for keeping the temperature at an appropriate temperature is narrower than that of thermoplastic resins. Therefore, the molding method is not so popular in the extrusion molding field, either by preliminarily blending the filler with the raw resin and feeding it in batches for compression molding, or by molding small articles such as electrical parts by injection molding, etc. The rate is not high.
しかし近年スクリユ形状や押出条件などを改良
することにより徐々にその押出成形が可能となつ
てきた。特に多軸押出機はその混合、混練性が優
れているため良く使用されている。 However, in recent years, extrusion molding has gradually become possible by improving the screw shape and extrusion conditions. In particular, multi-screw extruders are often used because of their excellent mixing and kneading properties.
従来ベント押出を必要とする樹脂の場合、第１
図のように汎用性のベント型多軸押出機１が使用
されるのが普通であるが、ベント部２を通過する
際、溶融樹脂の粘着による付着やベント吸引によ
る盛り上り樹脂が時間の経過とともに硬化し、ベ
ント孔３を塞いだり、同硬化樹脂が欠け落ちて押
出品の中に入り込む時の欠陥があつた。そのため
時々前記樹脂をベント孔３から取除き作業を行う
必要があり、連続して成形運転が出来ず、生産性
が悪かつた。 For resins that conventionally require vent extrusion, the first
As shown in the figure, a versatile vent type multi-screw extruder 1 is normally used, but when passing through the vent section 2, the molten resin adheres due to adhesion and the resin builds up due to vent suction over time. The cured resin also hardened, blocking the vent hole 3, and causing defects when the cured resin chipped and entered the extruded product. Therefore, it was necessary to remove the resin from the vent hole 3 from time to time, making it impossible to perform continuous molding operation, resulting in poor productivity.
本発明は前述のような欠点を取除き、ベント押
出が可能な押出機を提供することであり、さらに
詳しく本発明の押出機について説明すると、従来
装置のように、ホツパから製品排出口の間にベン
ト孔を設けず、製品排出口の下流にベント孔を設
けることにより、従来からベント孔に盛り上る樹
脂のために起きていた欠点を取除き、かつ互いに
同方向回転する２軸の押出機とすることにより、
異方向回転の２軸押出機に見られるような、スク
リユの溝が原料樹脂により充満されたとき、相隣
る溝同志が原料樹脂によりシールされ、ベント効
果がなくなるという欠点が取除いた押出機であ
る。 The purpose of the present invention is to eliminate the above-mentioned drawbacks and provide an extruder capable of vent extrusion. To explain the extruder of the present invention in more detail, unlike conventional devices, the extruder is operated between the hopper and the product discharge port. By creating a vent hole downstream of the product discharge port instead of having a vent hole in the vent hole, we have eliminated the conventional drawbacks caused by resin rising up in the vent hole. By doing so,
An extruder that eliminates the drawback of twin-screw extruders that rotate in different directions, where when the screw grooves are filled with raw resin, adjacent grooves are sealed by the raw resin, eliminating the vent effect. It is.
次に第２図により本発明の１実施例を説明する
と、１１および１２はバレル１３内で同方向回転
可能に挿入されたスクリユである。１４は原料樹
脂供給口である。１５は前記原料樹脂供給口１４
で供給された樹脂がバレル１３内で混練されて図
示していないダイ等から吐出されるよう同ダイ等
へ樹脂を供給する樹脂排出口である。１６はベン
ト部でバレル１３の先端部に設けてあり、スクリ
ユ径Ｄとほゞ同一巾、軸方向の長さ1.5Dのベン
ト口１７がバレル１３の上向きに開口している。 Next, one embodiment of the present invention will be described with reference to FIG. 2. Reference numerals 11 and 12 are screws inserted in the barrel 13 so as to be rotatable in the same direction. 14 is a raw resin supply port. 15 is the raw resin supply port 14
This is a resin discharge port for supplying resin to a die, etc. (not shown) so that the resin supplied in the barrel 13 is kneaded in the barrel 13 and discharged from a die, etc. (not shown). Reference numeral 16 denotes a vent portion, which is provided at the tip of the barrel 13, and has a vent port 17 opening upward in the barrel 13 and having a width substantially the same as the screw diameter D and an axial length of 1.5D.
前記スクリユ１１および１２の樹脂排出口１５
の先は0.5〜1D（以下ゾーンという）の範囲で前
記原料樹脂供給口１４から前記排出口１５までの
間のスクリユねじとは逆向きのねじが設けてあ
り、前記排出口１５より先へ押出される樹脂を積
極的に押戻しかつ万一ベント口１７側へ樹脂が流
れ込んだ場合、同樹脂を互いのスクリユ１１およ
び１２から掻き落し、粘着防止を行う。そして前
記Ａゾーンの先部（以下Ｂゾーンという）は前記
ベント口１７に達しており、ベント効果をより効
率よく行うため、スクリユ１１、および１２とバ
レル１３との間に出来る空隙部１８を可能なだけ
大きくするとともにスクリユの回転に伴う気体排
出のための回転翼となるような形状、例えば第３
図に示すような楕円形の断面を持つスクリユヘツ
ド１９となつている。 Resin outlet 15 of the screws 11 and 12
At the end of the screw, a screw is provided in the opposite direction to the screw screw between the raw resin supply port 14 and the discharge port 15 in the range of 0.5 to 1D (hereinafter referred to as zone), and the screw is extruded beyond the discharge port 15. If the resin flows into the vent port 17 side, the resin is scraped off from the screws 11 and 12 to prevent adhesion. The tip of the A zone (hereinafter referred to as the B zone) reaches the vent port 17, and in order to achieve a more efficient venting effect, it is possible to form a gap 18 between the screws 11 and 12 and the barrel 13. In addition to making it as large as possible, the shape is such that it becomes a rotary blade for discharging gas as the screw rotates, for example, the third
The screw head 19 has an oval cross section as shown in the figure.
以上のような構成となつており、従来ベント効
果を良くするために予め、原料供給ホツパを２な
いし３段ホツパとして高真空に維持し、押出機へ
供給する樹脂中に含有する空気やガス或いはモノ
マー等を除去する装置を設けた押出機と比べコス
ト的に有利なかつ保守や点検等の面倒が省かれ
る。 Conventionally, in order to improve the vent effect, the raw material supply hopper is maintained in a high vacuum as a two- or three-stage hopper, and the air, gas, or air contained in the resin supplied to the extruder is Compared to an extruder equipped with a device for removing monomers, etc., this method is cost-effective and requires less maintenance and inspection.
第１図は従来装置の図。第２図は本発明の１実
施例を示す図。第３図は第２図における断面―
でスクリユヘツドの断面形状を示す図。
１１，１２……スクリユ、１３……バレル、１
４……原料樹脂供給口、１５……樹脂排出口、１
６……ベント部、１７……ベント孔、１９……ス
クリユヘツド。
FIG. 1 is a diagram of a conventional device. FIG. 2 is a diagram showing one embodiment of the present invention. Figure 3 is a cross section of Figure 2.
A diagram showing the cross-sectional shape of the screw head. 11, 12... Skrill, 13... Barrel, 1
4... Raw resin supply port, 15... Resin discharge port, 1
6...Vent part, 17...Vent hole, 19...Screw head.
Claims (1)
軸押出機において、前記バレル先端部に上向きに
設けたベントポートと、前記スクリユの径をＤと
したときスクリユ先端より３〜7D手前に原料樹
脂排出口を設けたバレルと、前記排出口からスク
リユ先端に至る0.5〜1Dの間のスクリユねじ山が
前記バレルの原料樹脂供給と排出口との間のスク
リユねじ山と逆向きねじを有するスクリユと、前
記逆ねじ範囲よりスクリユ先端部に至る範囲でベ
ント効果を大ならしめるためのバレル内壁面と前
記スクリユとが構成する空隙部を可能な限り大き
くするとともにスクリユの回転に伴う気体排出の
ための回転翼となるような楕円形等の断面形状の
スクリユヘツドを有することを特徴とした熱硬化
性樹脂押出成形用多軸ベント押出機。1 In a multi-screw extruder having screws rotating in the same direction in the barrel, there is a vent port provided upward at the tip of the barrel, and a raw resin discharge port 3 to 7D before the tip of the screw, where the diameter of the screw is D. a barrel provided with an outlet, and a screw thread having a length between 0.5 and 1D extending from the discharge port to the tip of the screw, and a screw thread having a direction opposite to the screw thread between the raw resin supply and the discharge port of the barrel; In order to increase the vent effect in the range from the reverse thread range to the tip of the screw, the gap formed by the inner wall surface of the barrel and the screw is made as large as possible, and the screw is rotated to discharge gas as the screw rotates. A multi-screw vent extruder for extrusion molding of thermosetting resin, characterized by having a screw head with a cross-sectional shape such as an ellipse that acts as a wing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4678478A JPS54139669A (en) | 1978-04-20 | 1978-04-20 | Multiiaxes bent extruder for forming thermosetting resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4678478A JPS54139669A (en) | 1978-04-20 | 1978-04-20 | Multiiaxes bent extruder for forming thermosetting resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54139669A JPS54139669A (en) | 1979-10-30 |
| JPS6215328B2 true JPS6215328B2 (en) | 1987-04-07 |
Family
ID=12756948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4678478A Granted JPS54139669A (en) | 1978-04-20 | 1978-04-20 | Multiiaxes bent extruder for forming thermosetting resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54139669A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0492220U (en) * | 1990-12-26 | 1992-08-11 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5668774U (en) * | 1979-10-29 | 1981-06-08 |
-
1978
- 1978-04-20 JP JP4678478A patent/JPS54139669A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0492220U (en) * | 1990-12-26 | 1992-08-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54139669A (en) | 1979-10-30 |
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