JPS5935381Y2 - extrusion molding machine - Google Patents
extrusion molding machineInfo
- Publication number
- JPS5935381Y2 JPS5935381Y2 JP1980092201U JP9220180U JPS5935381Y2 JP S5935381 Y2 JPS5935381 Y2 JP S5935381Y2 JP 1980092201 U JP1980092201 U JP 1980092201U JP 9220180 U JP9220180 U JP 9220180U JP S5935381 Y2 JPS5935381 Y2 JP S5935381Y2
- Authority
- JP
- Japan
- Prior art keywords
- screw shaft
- diameter screw
- diameter
- small
- flights
- 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
- 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
- B29C48/42—Non-identical or non-mirrored 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
- B29C48/395—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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
本考案は押出成形機における押出スクリューの構造に関
し、バレル１内に一対の大径スクリュー軸２とこの大径
スクリュー軸２より径の小さい小径スクリュー軸３とを
平行に配設し、大径スクリュー軸の外周と小径スクリュ
ー軸３の外周にそれぞれスパイラル状にフライト４，５
を突設すると共に大径スクリュー軸２のフライト４のピ
ッチ間の一周における容積と小径スクリュー軸３のフラ
イト５のピッチ間の一周にお・ける容積を等しく設定し
、各フライト４，５の外周面をバレル１内周と他方の大
径スクリュー軸２乃至小径スクリュー軸３の外周に摺接
せしめて成る押出成形機に係るものである。[Detailed description of the invention] The present invention relates to the structure of an extrusion screw in an extrusion molding machine, in which a pair of large-diameter screw shafts 2 and a small-diameter screw shaft 3 whose diameter is smaller than the large-diameter screw shafts 2 are arranged in parallel in a barrel 1. Flights 4 and 5 are arranged in a spiral shape on the outer periphery of the large-diameter screw shaft and the outer periphery of the small-diameter screw shaft 3, respectively.
At the same time, the volume of the large diameter screw shaft 2 in one round between the pitches of the flights 4 and the volume in one revolution between the pitches of the flights 5 of the small diameter screw shaft 3 are set equal, and the outer periphery of each flight 4, 5 is set equal. This relates to an extrusion molding machine in which a surface is brought into sliding contact with the inner periphery of a barrel 1 and the outer periphery of the other large-diameter screw shaft 2 or small-diameter screw shaft 3.
従来より、押出成形機においてバレル内で材料の混合と
混練を充分に行なう為に、スクリュー構造に関して種々
の工夫がなされ実用に供されている。Conventionally, in order to sufficiently mix and knead materials within the barrel of an extrusion molding machine, various improvements have been made to the screw structure and put into practical use.
しかしながら末だに充分に混合、混練が達成された訳で
はなく、現在に至っても、なお色々な努力が為されてい
る。However, sufficient mixing and kneading have not yet been achieved, and even to this day, various efforts are still being made.
本考案は上記の点に鑑みてなされたものであって、成形
材料の混合、混線を充分に行なうことができ、しかも成
形材料が熱的に不安定な材料であってもゲル化や分解を
起こすおそれがない押出成形機を提供することを目的と
するものである。The present invention was developed in view of the above points, and it is possible to sufficiently mix and cross-wire the molding materials, and also prevent gelation and decomposition even if the molding materials are thermally unstable. The object of the present invention is to provide an extrusion molding machine that is free from the risk of causing problems.
以下本考案を実施例により詳述する。The present invention will be explained in detail below using examples.
押出成形機のバレル１内に大径スクリュー軸２と小径ス
クリュー軸３とが平行に回転駆動自在に配設してあり、
この両スクリュー軸２，３は逆方向に回転駆動するよう
にしである。A large-diameter screw shaft 2 and a small-diameter screw shaft 3 are arranged in parallel in a barrel 1 of an extrusion molding machine so as to be rotatably driven.
Both screw shafts 2 and 3 are designed to rotate in opposite directions.
また大径スクリュー軸２と小径スクリュー軸３の外周に
はそれぞれフライト４，５が逆方向のスパイラルで突設
しである。Further, flights 4 and 5 are provided on the outer peripheries of the large-diameter screw shaft 2 and the small-diameter screw shaft 3, respectively, in a spiral manner in opposite directions.
小径スクリュー軸３のフライト５は大径部６と、成形材
料を輸送す−るフライトとしての役割を果たさずフライ
ト４との噛み合いの必要上形成した小径部７とを交互に
設けることにより形成してあり、フライト５としての実
質的なピンチとなる大径部６間のピッチＰＩを大径スク
リュー軸２のフライト４のピッチＰ２より大きくして、
フライト４，５のピンチ間の谷部の一周における容積が
大径スクリュー軸２と小径スクリュー軸３とで相等しく
なるように設定しである。The flights 5 of the small-diameter screw shaft 3 are formed by alternately providing a large-diameter portion 6 and a small-diameter portion 7 that does not play a role as a flight for transporting the molding material and is formed for the purpose of meshing with the flight 4. The pitch PI between the large diameter portions 6, which is a substantial pinch point as the flights 5, is made larger than the pitch P2 of the flights 4 of the large diameter screw shaft 2,
The volume in one circumference of the valley between the pinches of the flights 4 and 5 is set to be equal between the large diameter screw shaft 2 and the small diameter screw shaft 3.
またバレル１の内周は断面繭形に成形して、第２図のよ
うに大径スクリュー軸２のフライト４や小径スクリュー
軸３のフライト５がバレル１の内周に摺接するようにし
てあり、さらに各フライト４，５を噛み合わせて、フラ
イト４は小径スクリュー軸３の軸外周面にフライト５は
大径スクリュー軸２の軸外周面に摺接するようにしであ
る。The inner periphery of the barrel 1 is formed into a cocoon-shaped cross section so that the flights 4 of the large-diameter screw shaft 2 and the flights 5 of the small-diameter screw shaft 3 come into sliding contact with the inner periphery of the barrel 1, as shown in FIG. Furthermore, the flights 4 and 5 are engaged with each other so that the flight 4 is in sliding contact with the outer peripheral surface of the small diameter screw shaft 3 and the flight 5 is in sliding contact with the outer peripheral surface of the large diameter screw shaft 2.
押出成形機におけるスクリューは成形材料が送られる方
向に沿って基部より、フィード部、遷移部（又は圧縮部
）、溶融部で構成されるが、上記スクリューの構造部分
は遷移部（又は圧縮部）または溶融部に設けるのがよい
。The screw in an extrusion molding machine is composed of a feed section, a transition section (or compression section), and a melting section from the base along the direction in which the molding material is fed, and the structural section of the screw is the transition section (or compression section). Alternatively, it is better to provide it in the melting part.
しかして、ホッパーよりバレル１内に投入された成形材
料はスクリューのフィード部で固体状のまま移送され、
次でバレル１からの伝導熱とバレル１及びスクリューと
の間の摩擦熱を受けて成形材料は圧縮を受けると共に次
第に溶融状態へと遷移する。The molding material put into the barrel 1 from the hopper is transferred in a solid state by the feed section of the screw.
Next, the molding material is compressed by the conduction heat from the barrel 1 and the frictional heat between the barrel 1 and the screw, and gradually transitions to a molten state.
このような半溶融又は溶融状態の成形材料が本考案に係
る構造の部分に達すると、大径スクリュー軸２と小径ス
クリュー軸３の軸径が異なるために成形材料の剪断変移
を大きく受け、混線効果が大きくなるものである。When such semi-molten or molten molding material reaches the part of the structure according to the present invention, the molding material is subjected to a large shear displacement due to the difference in shaft diameter of the large-diameter screw shaft 2 and the small-diameter screw shaft 3, and crosstalk occurs. The effect will be greater.
またこのように軸径が異なるにもかかわらず、大径スク
リュー軸２のフライト４と小径スクリュー軸３のフライ
ト５とのピッチ間における容積を相互に等しくしである
ために成形材料が偏流して流れることはないものであり
、さらにフライト４，５の外周はバレル１の内周や他方
の大径スクリュー軸２乃至小径スクリュー軸３の外周に
摺接しているために、セルフクリーニング機構を有して
成形材料がバックフローしたリバレル１内で滞留したり
することなく確実に輸送される。In addition, even though the shaft diameters differ in this way, the volumes between the pitches of the flights 4 of the large-diameter screw shaft 2 and the flights 5 of the small-diameter screw shaft 3 are made equal to each other, so that the molding material flows unevenly. It does not flow, and since the outer periphery of the flights 4 and 5 is in sliding contact with the inner periphery of the barrel 1 and the outer periphery of the other large-diameter screw shaft 2 or small-diameter screw shaft 3, it has a self-cleaning mechanism. The molding material is surely transported without being retained in the rebarrel 1 where it backflowed.
このように成形材料は偏流したり滞留したりすることが
ないために、成形材料が熱的に不安定であってもゲル化
や分解などの変質を起こすおそれはないものである。In this way, the molding material does not drift or stagnate, so even if the molding material is thermally unstable, there is no risk of deterioration such as gelation or decomposition.
溶融混練された成形材料はバレル１の先端のダイより押
出されて成形がなされる。The melt-kneaded molding material is extruded from a die at the tip of the barrel 1 and molded.
上記のように本考案は、バレル内に一対の大径スクリュ
ー軸とこの大径スクリュー軸より径の小さい小径スクリ
ュー軸とを平行に配設し、大径スクリュー軸の外周と小
径スクリュー軸の外周にそれぞれスパイラル状にフライ
トを突設すると共に大径スクリュー軸のフライトのピッ
チ間の一周における容積と小径スクリュー軸のフライト
のピッチ間の一周における容積を等しく設定し、各フラ
イトの外周面をバレル内周と他方の大径スクリュー軸乃
至小径スクリュー軸の外周に摺接せしめであるので、成
形材料に強い剪断力を与えて大きい効果で混練混合を行
なうことができ、しかも成形材料の流れに偏流を生じさ
せたり滞留を生じさせたりするおそれなく、成形材料が
熱的に不安定であってもゲル化や分解等の変質を起こす
おそれがないものである。As mentioned above, the present invention has a pair of large-diameter screw shafts and a small-diameter screw shaft whose diameter is smaller than the large-diameter screw shafts arranged in parallel inside the barrel, and the outer periphery of the large-diameter screw shaft and the outer periphery of the small-diameter screw shaft. At the same time, the volume in one round between the pitches of the flights of the large-diameter screw shaft is set equal to the volume in one round between the pitches of the flights of the small-diameter screw shaft, and the outer peripheral surface of each flight is set inside the barrel. Since it is in sliding contact with the outer periphery of the other large-diameter screw shaft or small-diameter screw shaft, it is possible to apply a strong shearing force to the molding material and perform kneading and mixing with great effect, and it also prevents uneven flow in the flow of the molding material. There is no risk of generation or stagnation, and there is no risk of alteration such as gelation or decomposition even if the molding material is thermally unstable.
第１図は本考案−実施例の断面図、第２図は第１図のＡ
−Ａ’線断面図である。
１はバレル、２は大径スクリュー軸、３は小径スクリュ
ー軸、４はフライト、５はフライトである。Figure 1 is a sectional view of the present invention--an embodiment, and Figure 2 is A of Figure 1.
-A' line sectional view. 1 is a barrel, 2 is a large diameter screw shaft, 3 is a small diameter screw shaft, 4 is a flight, and 5 is a flight.
Claims (1)
ー軸より径の小さい小径スクリュー軸とを平行に配設し
、大径スクリュー軸の外周と小スクリュー軸の外周にそ
れぞれスパイラル状にフライトを突設すると共に大径ス
クリュー軸のフライトのピッチ間の一周における容積と
小径スクリュー軸のフライトのピッチ間の一周にお・け
る容積を等しく設定し、各フライトの外周面をバレル内
周と他方の大径スクリュー軸乃至小径スクリュー軸の外
周に摺接せしめて成る押出成形機。A pair of large-diameter screw shafts and a small-diameter screw shaft whose diameter is smaller than this large-diameter screw shaft are arranged in parallel inside the barrel, and flights are protruded in a spiral shape on the outer periphery of the large-diameter screw shaft and the outer periphery of the small screw shaft, respectively. At the same time, the volume in one round between the pitches of the flights of the large-diameter screw shaft and the volume in one revolution between the pitches of the flights of the small-diameter screw shaft are set equal, and the outer peripheral surface of each flight is set equal to the inner circumference of the barrel and the other large diameter. An extrusion molding machine that is in sliding contact with the outer periphery of a diameter screw shaft or a small diameter screw shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980092201U JPS5935381Y2 (en) | 1980-06-30 | 1980-06-30 | extrusion molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980092201U JPS5935381Y2 (en) | 1980-06-30 | 1980-06-30 | extrusion molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5716329U JPS5716329U (en) | 1982-01-27 |
| JPS5935381Y2 true JPS5935381Y2 (en) | 1984-09-29 |
Family
ID=29454156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980092201U Expired JPS5935381Y2 (en) | 1980-06-30 | 1980-06-30 | extrusion molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5935381Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62199905U (en) * | 1986-06-09 | 1987-12-19 | ||
| DE202013001817U1 (en) * | 2013-02-26 | 2014-06-04 | Vemag Maschinenbau Gmbh | Arrangement of tight closing screw conveyors |
-
1980
- 1980-06-30 JP JP1980092201U patent/JPS5935381Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5716329U (en) | 1982-01-27 |
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