JPS6238130U - - Google Patents
Info
- Publication number
- JPS6238130U JPS6238130U JP1985129719U JP12971985U JPS6238130U JP S6238130 U JPS6238130 U JP S6238130U JP 1985129719 U JP1985129719 U JP 1985129719U JP 12971985 U JP12971985 U JP 12971985U JP S6238130 U JPS6238130 U JP S6238130U
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- screw
- cylindrical chamber
- barrel
- inner diameter
- 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.)
- Granted
Links
- 238000001125 extrusion Methods 0.000 claims 11
- 230000010006 flight Effects 0.000 claims 2
- 230000007704 transition Effects 0.000 claims 2
- 230000007423 decrease Effects 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 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
- B29C48/63—Screws having sections without mixing elements or threads, i.e. having cylinder shaped sections
-
- 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
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
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
第１図は本考案の一実施例を示す縦断面図、第
２図は第１図の―線の軸直角断面図、第３図
は第１図の―線の軸直角断面図、第４図は第
１図の―線の軸直角断面図、第５図及び第６
図は他の実施例を示す軸直角断面図であつて第１
図の―断面図に対応する図、第７図は従来例
を示す縦断面図、第８図は第７図の―線の軸
直角断面図である。
１……バレル、２……円筒室、２ａ……径大円
筒室、２ｂ……径小円筒室、２ｃ……二重内径部
、３……スクリユ、６……フライト、７……無螺
子部、θ……噛合角度、Ｄ……円筒室の内径、Ｈ
……噛合深さ。
Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view perpendicular to the axis along the line - in Fig. 1, Fig. 3 is a sectional view perpendicular to the axis along the - line in Fig. The figures are cross-sectional views perpendicular to the axis taken along the - line in Figure 1, Figures 5 and 6.
The figure is an axis-perpendicular cross-sectional view showing another embodiment.
FIG. 7 is a vertical cross-sectional view showing a conventional example, and FIG. 8 is a cross-sectional view perpendicular to the axis along the line --- in FIG. 7. 1...Barrel, 2...Cylindrical chamber, 2a...Large diameter cylindrical chamber, 2b...Small diameter cylindrical chamber, 2c...Double inner diameter part, 3...Screw, 6...Flight, 7...Screwless part, θ...meshing angle, D...inner diameter of cylindrical chamber, H
...Depth of engagement.
Claims (1)
２としたバレル１の前記２つの円筒室２内に平行
で互いに噛合つて回転する２本のスクリユ３を備
えた二軸スクリユ押出成形機において、 前記バレル１の２つの円筒室２を、それぞれ入
口側部分の内径Ｄ１より押出口側部分の内径Ｄ２
の方を径小に形成して、押出口側に行くにつれて
段階的に径小となる少なくとも２段階の内径とし
、バレル入口側の径大円筒室２ａから、バレル押
出口側の径小円筒室２ｂ部分へと移行する中間部
分の円筒室２の内径を、同筒室２の内壁面にバレ
ル１の軸方向に向かう凹凸条を形成することによ
つて、その最大径がバレル入口側部分の径大円筒
室２ａの内径Ｄ１と同一以下で、最小径がバレル
後段部分の径小円筒室２ｂの内径Ｄ２と同一とな
るような二重内径部２ｃとして形成し、 前記スクリユ３の外径を、同筒室２の内径に対
応して、径大円筒室２ａの内径Ｄ１に対応した部
分が径大で、二重内径部２ｃからバレル押出口側
の径小円筒室２ｂの内径Ｄ２に対応した部分が径
小となるよう、バレル入口側から押出口側に行く
につれて段階的に径小となる少なくとも２段階の
外径としたことを特徴とする二軸スクリユ押出成
形機。 (2) 前記バレル１の２つの円筒室２を、バレル
入口側たるバレル前段部分の径大円筒室２ａと、
バレル押出口側たるバレル後段部分の径小円筒室
２ｂとの２段階に形成するとともに、その中間部
分に前記二重内径部２ｃを形成し、 これに対応して、スクリユ３の外径を、前記径
大円筒室２ａに対応したスクリユ前段部分が径大
円筒室２ａの内径Ｄ１に対応して径大とし、バレ
ル中間部分の二重内径部２ｃからバレル後段部分
の径小円筒室２ｂに対応したスクリユ中間部分及
び後段部分がバレル後段部分の径小円筒室２ｂの
内径Ｄ２に対応して径小とすることにより２段階
の外径としたことを特徴とする実用新案登録請求
の範囲第１項記載の二軸スクリユ押出成形機。 (3) 外径の大きい前記スクリユ前段部分の噛合
角度θ１がπ／４以下で、外径の小さい前記スク
リユ中間部分及び後段部分の噛合角度θ２がπ／
６以下となるように前記２本のスクリユ３の芯間
距離Ｒｎを定めたことを特徴とする実用新案登録
請求の範囲第２項記載の二軸スクリユ押出成形機
。 (4) 径大円筒室２ａに対応する前記スクリユ前
段部分は、その軸直角断面の輪郭が２本のスクリ
ユ３の芯間距離Ｒｎを半径とし、中心点をスクリ
ユ外径の描く円周上に置いて描いた凸円弧を両面
とした略紡錘形で、紡錘形の両端をフライト６と
した２条の螺子とし、前記二重内径部２ｃに対応
するスクリユ中間部分は、その軸直角断面の輪郭
が２本のスクリユ３の芯間距離Ｒｎを半径とし、
中心点をスクリユ外径の描く円周上に置いて描い
た凸円弧とこの凸円弧と略同一曲率の凹円弧との
連続線で形成される３辺の形成した３角形で、そ
の３つの頂部をフライト６とした３条の螺子とし
、さらに、スクリユ中間部分における径小円筒室
２ｂ側部分は、その軸直角断面の輪郭がスクリユ
芯間距離Ｒｎを半径とし、中心点をスクリユ外径
の描く円周上に置いて描いた凸円弧で３つの辺を
形成した３角形で、リードをかけずに無螺子部７
とし、また、径小円筒室２ｂに対応するスクリユ
後段部分は、その軸直角断面の輪郭がスクリユ中
間部分における径小円筒室２ｂ側部分と同様の形
状に形成されるとともにリードをかけて３角形の
３つの頂部をフライト６とした３条の螺子とした
ことを特徴とする実用新案登録請求の範囲第３項
記載の二軸スクリユ押出成形機。[Claims for Utility Model Registration] (1) A barrel 1 has two parallel cylindrical chambers 2 communicating with each other, and two screws 3 are provided in the two cylindrical chambers 2 in parallel and meshing with each other to rotate. In the twin-screw extrusion molding machine, the two cylindrical chambers 2 of the barrel 1 are each arranged such that the inner diameter D 1 of the inlet side portion is larger than the inner diameter D 2 of the extrusion side portion.
The inner diameter is formed to have a smaller diameter in at least two stages, with the diameter decreasing stepwise as it goes toward the extrusion port side, from the large diameter cylindrical chamber 2a on the barrel inlet side to the small diameter cylindrical chamber on the barrel extrusion port side. The inner diameter of the cylindrical chamber 2 in the intermediate portion that transitions to the 2b portion is changed by forming uneven stripes in the axial direction of the barrel 1 on the inner wall surface of the cylindrical chamber 2, so that the maximum diameter of the inner diameter of the cylindrical chamber 2 in the intermediate portion that transitions to the portion 2b is changed to that of the barrel inlet side portion. It is formed as a double inner diameter part 2c which is equal to or less than the inner diameter D1 of the large diameter cylindrical chamber 2a and whose minimum diameter is the same as the inner diameter D2 of the small diameter cylindrical chamber 2b in the rear part of the barrel, and the outer diameter of the screw 3 is The diameter of the large diameter cylindrical chamber 2a is large in the portion corresponding to the inner diameter D1 , and the inner diameter of the small diameter cylindrical chamber 2b on the barrel extrusion port side from the double inner diameter portion 2c. A twin-screw extrusion molding machine characterized by having an outer diameter of at least two stages, the diameter of which decreases in stages from the barrel inlet side to the extrusion outlet side so that the diameter of the portion corresponding to D2 becomes smaller. (2) The two cylindrical chambers 2 of the barrel 1 are a large diameter cylindrical chamber 2a in the front part of the barrel on the barrel inlet side,
It is formed in two stages with the small diameter cylindrical chamber 2b in the rear part of the barrel, which is the barrel extrusion port side, and the double inner diameter part 2c is formed in the middle part, and correspondingly, the outer diameter of the screw 3 is The front part of the screw corresponding to the large-diameter cylindrical chamber 2a has a large diameter corresponding to the inner diameter D1 of the large-diameter cylindrical chamber 2a , and from the double inner diameter part 2c in the middle part of the barrel to the small-diameter cylindrical chamber 2b in the rear part of the barrel. Claims for registration of a utility model characterized in that the diameters of the corresponding intermediate and rear parts of the screw are made smaller in accordance with the inner diameter D2 of the small diameter cylindrical chamber 2b in the rear part of the barrel, resulting in two levels of outer diameter. 2. The twin-screw extrusion molding machine according to item 1. (3) The engagement angle θ 1 of the screw front part having a large outer diameter is π/4 or less, and the engagement angle θ 2 of the screw middle part and rear stage part having a small outer diameter is π/4 or less.
The twin-screw extrusion molding machine according to claim 2, wherein the distance Rn between the centers of the two screws 3 is determined to be 6 or less. (4) The front part of the screw corresponding to the large-diameter cylindrical chamber 2a has an outline of a cross section perpendicular to its axis, with a radius corresponding to the distance Rn between the centers of the two screws 3, and a center point on the circumference drawn by the outside diameter of the screw. It has a substantially spindle shape with convex arcs drawn on both sides, and has two threads with flights 6 at both ends of the spindle shape. Let the center distance Rn of the book screw 3 be the radius,
A triangle with three sides formed by a continuous line of a convex arc drawn with the center point on the circumference of the screw outer diameter, and a concave arc of approximately the same curvature as this convex arc, and its three vertices In addition, the small diameter cylindrical chamber 2b side part in the middle part of the screw has a cross section perpendicular to its axis whose radius is the distance Rn between the screw centers, and the center point is drawn by the screw outer diameter. It is a triangle with three sides formed by convex arcs drawn on the circumference, and the screwless part 7 is formed without a lead.
In addition, the rear part of the screw corresponding to the small diameter cylindrical chamber 2b has a cross section perpendicular to its axis in the same shape as the small diameter cylindrical chamber 2b side part of the intermediate part of the screw, and has a triangular shape with a lead. The twin-screw extrusion molding machine according to claim 3, which is a registered utility model, and is characterized in that it has a three-thread screw with three top portions serving as flights 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985129719U JPH0215632Y2 (en) | 1985-08-26 | 1985-08-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985129719U JPH0215632Y2 (en) | 1985-08-26 | 1985-08-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6238130U true JPS6238130U (en) | 1987-03-06 |
| JPH0215632Y2 JPH0215632Y2 (en) | 1990-04-26 |
Family
ID=31026543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985129719U Expired JPH0215632Y2 (en) | 1985-08-26 | 1985-08-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0215632Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012076254A (en) * | 2010-09-30 | 2012-04-19 | Japan Steel Works Ltd:The | Method and apparatus for plastic extrusion |
-
1985
- 1985-08-26 JP JP1985129719U patent/JPH0215632Y2/ja not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012076254A (en) * | 2010-09-30 | 2012-04-19 | Japan Steel Works Ltd:The | Method and apparatus for plastic extrusion |
| US8870441B2 (en) | 2010-09-30 | 2014-10-28 | The Japan Steel Works, Ltd. | Apparatus and method for plastic extrusion |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0215632Y2 (en) | 1990-04-26 |
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