JPS6054174B2 - Continuous foam extrusion equipment - Google Patents
Continuous foam extrusion equipmentInfo
- Publication number
- JPS6054174B2 JPS6054174B2 JP53141985A JP14198578A JPS6054174B2 JP S6054174 B2 JPS6054174 B2 JP S6054174B2 JP 53141985 A JP53141985 A JP 53141985A JP 14198578 A JP14198578 A JP 14198578A JP S6054174 B2 JPS6054174 B2 JP S6054174B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- flight
- extrusion device
- reverse
- screw flight
- 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
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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
- B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
-
- 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
- B29C48/55—Screws having reverse-feeding elements
Description
【発明の詳細な説明】
本発明は発泡体を連続的に押出す装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously extruding foam.
従来熱可塑性樹脂から発泡体を製造する装置は種々報告
されているが、発泡剤として炭酸ガス、窒素ガス、プロ
パン、ブタン等の気体を使用する際には気体を熱可塑性
樹脂中に均一に分散することが困難であり均一な発泡体
は得られにくかつた。Various devices have been reported for producing foams from thermoplastic resins, but when using gases such as carbon dioxide, nitrogen gas, propane, butane as blowing agents, it is necessary to uniformly disperse the gas in the thermoplastic resin. It was difficult to obtain a uniform foam.
本発明の目的は炭酸ガス、窒素ガス、プロパン、ブタン
等の気体を発泡剤として使用し連続的に発泡体を成型す
る装置を提供することにある。An object of the present invention is to provide an apparatus for continuously molding a foam using gas such as carbon dioxide, nitrogen gas, propane, butane, etc. as a foaming agent.
即ち本発明の要旨は原料供給口より吐出口側のシリンダ
ー又はスクリューに発泡剤注入口の設けられたスクリュ
ー式発泡体押出装置において前記発泡剤注入口より吐出
口側のスクリューにスクリューフライトよりも低くかつ
スクリューフライトと逆ねじのフライトが設けられたこ
とを特徴とする発泡体の連続押出装置に存する。次に本
発明の一例を図面で説明する。第１図は本発明の押出装
置の一例を示す部分断面図である。That is, the gist of the present invention is that in a screw type foam extrusion device in which a blowing agent inlet is provided in a cylinder or screw on the side of the discharge port from the raw material supply port, the screw flight in the screw on the side of the discharge port from the blowing agent inlet is lower than that of the screw flight. The present invention also provides a continuous foam extrusion device characterized by being provided with a screw flight and a reverse screw flight. Next, an example of the present invention will be explained with reference to the drawings. FIG. 1 is a partial sectional view showing an example of an extrusion device of the present invention.
図中１はシリンダーであり、シリンダー１には一端に原
料供給口６が設けられ、他端には吐出口８を通じて金型
９が設置され、中間には発泡剤注入口７が設けられてい
る。In the figure, 1 is a cylinder, and the cylinder 1 is provided with a raw material supply port 6 at one end, a mold 9 is installed at the other end through a discharge port 8, and a foaming agent injection port 7 is provided in the middle. .
２はスクリューであり、駆動装置５に連結されている。2 is a screw, which is connected to a drive device 5.
スクリュー２には全長にわたつてスクリューフライト３
が設けられており、又混練領域１３においてスクリュー
フライト３より低くかつスクリューフライト３と連続ね
じのフライト４が設けられている。スクリューフライト
３と逆ねじのフライト４のピッチの関係は特に限定され
るものではないが同ピッチとなされるのが好ましい。反
逆ねじのフラ、イト４の高さはスクリューフライト３の
高さよりも低ければ・よいのであるが、スクリューフラ
イト３の高さのｌｈ以上であるのが好ましい。又スクリ
ュー２はフィード領域１０から第１圧縮領域１１、第１
計量化領域１２にかけて次第に太くなつており、混練領
域１３では再び細くなつている。Screw flight 3 is attached to screw 2 over its entire length.
Further, in the kneading region 13, a flight 4 of a thread lower than the screw flight 3 and continuous with the screw flight 3 is provided. The relationship between the pitches of the screw flights 3 and the flights 4 of reverse thread is not particularly limited, but it is preferable that they be the same pitch. The height of the counter-screw fly 4 may be lower than the height of the screw flight 3, but it is preferable that it is at least lh of the height of the screw flight 3. Further, the screw 2 is connected from the feed area 10 to the first compression area 11 and the first
It gradually becomes thicker toward the metering region 12, and becomes thinner again in the kneading region 13.
そして混練領域１３から第２圧縮領域１牡第２計量化領
域１５にかけて再びしだいに太くなつており、第２計量
化領域の先端即ちスクリューの先端は吐出口８の手前に
設置されている。前記逆ねじのフライト４は圧縮領域１
３の他、第２圧縮領域１４及び第２計量化領域にも設け
られて良いが、混練領域１３だけに設けられるのが好ま
しい。又第１図に示した押出装置は１段式装置であつて
発泡剤注入口はシリンダーに設けられているが、押出装
置は２段式装置であつてもよく、発泡剤注入口はスクリ
ューに設けられてもよい。From the kneading area 13 to the second compression area 1 and the second metering area 15, the thickness gradually increases again, and the tip of the second metering area, that is, the tip of the screw, is located in front of the discharge port 8. The reverse screw flight 4 is the compression area 1
In addition to 3, it may be provided in the second compression region 14 and the second metering region, but it is preferable to provide it only in the kneading region 13. Furthermore, the extrusion device shown in Fig. 1 is a one-stage device in which the blowing agent inlet is provided in the cylinder, but the extrusion device may be a two-stage device in which the blowing agent inlet is provided in the screw. may be provided.
次に第１図に示した押出装置で発泡体を製造する方法を
説明する。原料供給口６からポリエチレン、ポリプロピ
レン等の熱可塑性樹脂、滑剤、核剤等の原料をフィード
領域１０に供給し、フィード領域１０から第１圧縮領域
１１、第１計量化領域１２にかけて次第に圧縮され加熱
溶融されて混練領域１３に送られる。Next, a method for producing a foam using the extrusion apparatus shown in FIG. 1 will be explained. Raw materials such as thermoplastic resins such as polyethylene and polypropylene, lubricants, and nucleating agents are supplied from the raw material supply port 6 to the feed region 10, and are gradually compressed and heated from the feed region 10 to the first compression region 11 and the first metering region 12. It is melted and sent to the kneading area 13.
混練領域１３ては圧縮が解放されると同時に発泡剤注入
口７から炭酸ガス、窒素ガス、プロパン、ブタン等の発
泡型が注入され原料と発泡剤は混練される。次いで第２
圧縮領域１４及び第２計量化領域１５に順次送られ金型
９から押出されて発泡体が製造される。本発明の押出装
置のスクリューは混合領域において押出用のスクリュー
フライトの他に、スクリューフライトより低くかつ逆ね
じのフライトが設．けられているのであるから、原料は
スクリューフライトで押出されると同時に逆ねじのフラ
イトで押出方向の逆方向に送られるので、非常によく混
練され原料に発泡剤が均一に分散され、均一な発泡体が
得られるのである。In the kneading region 13, at the same time as the compression is released, a foaming mold such as carbon dioxide gas, nitrogen gas, propane, butane, etc. is injected from the foaming agent inlet 7, and the raw material and the foaming agent are kneaded. Then the second
The foam is sequentially sent to the compression area 14 and the second metering area 15 and extruded from the mold 9 to produce a foam. The screw of the extrusion device of the present invention has, in addition to the screw flight for extrusion, a flight that is lower than the screw flight and has a reverse thread in the mixing region. Because the raw material is extruded by a screw flight, it is simultaneously sent in the opposite direction to the extrusion direction by a reverse screw flight, so it is kneaded very well and the blowing agent is evenly dispersed in the raw material, resulting in a uniform product. A foam is obtained.
次に本発明を実施例により説明する。Next, the present invention will be explained by examples.
実施例
スクリューの外径が６５Ｔｎ．．Ｌ／Ｄが３２である第
１図に示した形状の押出機に、ポリエチレン（密度０．
９２メルトインデックス２０）１００重量部及びタルク
２重量部を原料供給口６から供給し、発泡剤注入口から
炭酸ガスを注入圧５０ｋ９／Ｃｉｌの条件で注入し、１
０ｋ９／Ｈｒの条件で押出した。The outer diameter of the example screw is 65Tn. ．． A polyethylene (density 0.
92 melt index 20) 100 parts by weight and 2 parts by weight of talc were supplied from the raw material supply port 6, and carbon dioxide gas was injected from the blowing agent injection port at an injection pressure of 50k9/Cil.
It was extruded under the condition of 0k9/Hr.
なおスクリューフライトのピッチ数、溝の深さ及び各領
域の温゛度は第１表に示した。又逆ピッチのフライトの
溝の深さは２６顛、ピッチ数は６であつた。The number of pitches of the screw flights, the depth of the grooves, and the temperature of each region are shown in Table 1. In addition, the groove depth of the reverse pitch flight was 26 squares, and the number of pitches was 6.
得られた発泡体は均一に発泡しており、発泡倍率は１２
．２倍であり、約９０％が独立気泡であつた。The obtained foam was uniformly foamed, and the foaming ratio was 12.
．． 2 times, and about 90% were closed cells.
第１図は、本発明の押出装置の一例を示す部分断面図で
ある。
１・・・シリンダー、２・・・スクリュー、３・・・ス
クリューフライト、４・・・逆ねじのフライト、５・・
・駆動装置、６・・・原料供給口、７・・・発泡剤注入
口、８・・・吐出口、９・・・金型、１０・・・フィー
ド領域、１１・・・第１圧縮領域、１２・・・第１計量
化領域、１３・・・混練領域、１４・・・第２圧縮領域
、１５・・・第２計量化領域。FIG. 1 is a partial sectional view showing an example of an extrusion device of the present invention. 1... Cylinder, 2... Screw, 3... Screw flight, 4... Reverse screw flight, 5...
- Drive device, 6... Raw material supply port, 7... Foaming agent injection port, 8... Discharge port, 9... Mold, 10... Feed area, 11... First compression area , 12... first metering area, 13... kneading area, 14... second compression area, 15... second metering area.
Claims (1)
ーに発泡剤注入口の設けられたスクリュー式発泡体押出
装置において、前記発泡剤注入口より吐出口側のスクリ
ューにスクリューフライトよりも低くかつスクリューフ
ライトと逆ねじのフライトが設けられたことを特徴とす
る発泡体の連続押出装置。 ２ 逆ねじのフライトが混合領域において設けられた特
許請求の範囲第１項記載の押出装置。 ３ スクリューフライトと逆ねじのフライトが同ピッチ
である特許請求の範囲第１項記載の押出装置。 ４ 逆ねじのフライトの高さがスクリューフライトの高
さより低くかつ１／２以上である特許請求の範囲第１項
記載の押出装置。[Scope of Claims] 1. In a screw type foam extrusion device in which a blowing agent inlet is provided in a cylinder or screw on the side of the discharge port from the raw material supply port, a screw flight is provided in the screw on the side of the discharge port from the blowing agent inlet. A continuous foam extrusion device characterized by having a low screw flight and a reverse screw flight. 2. The extrusion device according to claim 1, wherein flights of reverse threads are provided in the mixing region. 3. The extrusion device according to claim 1, wherein the screw flights and the reverse screw flights have the same pitch. 4. The extrusion device according to claim 1, wherein the height of the flight of the reverse thread is lower than the height of the screw flight and is 1/2 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53141985A JPS6054174B2 (en) | 1978-11-16 | 1978-11-16 | Continuous foam extrusion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53141985A JPS6054174B2 (en) | 1978-11-16 | 1978-11-16 | Continuous foam extrusion equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5567420A JPS5567420A (en) | 1980-05-21 |
| JPS6054174B2 true JPS6054174B2 (en) | 1985-11-29 |
Family
ID=15304707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53141985A Expired JPS6054174B2 (en) | 1978-11-16 | 1978-11-16 | Continuous foam extrusion equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6054174B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7942531B2 (en) | 2001-02-27 | 2011-05-17 | Dolby Laboratories Licensing Corporation | Edge lit locally dimmed display |
| US8446351B2 (en) | 2002-03-13 | 2013-05-21 | Dolby Laboratories Licensing Corporation | Edge lit LED based locally dimmed display |
| US8687271B2 (en) | 2002-03-13 | 2014-04-01 | Dolby Laboratories Licensing Corporation | N-modulation displays and related methods |
-
1978
- 1978-11-16 JP JP53141985A patent/JPS6054174B2/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7942531B2 (en) | 2001-02-27 | 2011-05-17 | Dolby Laboratories Licensing Corporation | Edge lit locally dimmed display |
| US8408718B2 (en) | 2001-02-27 | 2013-04-02 | Dolby Laboratories Licensing Corporation | Locally dimmed display |
| US8419194B2 (en) | 2001-02-27 | 2013-04-16 | Dolby Laboratories Licensing Corporation | Locally dimmed display |
| US8684533B2 (en) | 2001-02-27 | 2014-04-01 | Dolby Laboratories Licensing Corporation | Projection displays |
| US8446351B2 (en) | 2002-03-13 | 2013-05-21 | Dolby Laboratories Licensing Corporation | Edge lit LED based locally dimmed display |
| US8687271B2 (en) | 2002-03-13 | 2014-04-01 | Dolby Laboratories Licensing Corporation | N-modulation displays and related methods |
| US8890799B2 (en) | 2002-03-13 | 2014-11-18 | Dolby Laboratories Licensing Corporation | Display with red, green, and blue light sources |
| US11378840B2 (en) | 2002-03-13 | 2022-07-05 | Dolby Laboratories Licensing Corporation | Image display |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5567420A (en) | 1980-05-21 |
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