JPH0344508Y2 - - Google Patents
Info
- Publication number
- JPH0344508Y2 JPH0344508Y2 JP1985043436U JP4343685U JPH0344508Y2 JP H0344508 Y2 JPH0344508 Y2 JP H0344508Y2 JP 1985043436 U JP1985043436 U JP 1985043436U JP 4343685 U JP4343685 U JP 4343685U JP H0344508 Y2 JPH0344508 Y2 JP H0344508Y2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- flight
- resin
- heating cylinder
- pressure
- 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
- 239000011347 resin Substances 0.000 claims description 22
- 229920005989 resin Polymers 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000010006 flight Effects 0.000 claims description 9
- 238000010137 moulding (plastic) Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000005484 gravity Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 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
- B29C48/63—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
- B29C48/50—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)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
（考案の属する技術分野）
本考案は射出成形機等のスクリユが加熱シリン
ダの内壁面へ接触するのを防止したプラスチツク
成形用装置に関する。[Detailed description of the invention] (Technical field to which the invention pertains) The present invention relates to a plastic molding apparatus that prevents the screw of an injection molding machine or the like from coming into contact with the inner wall surface of a heating cylinder.
（従来技術）
従来成形装置内のスクリユにおいて、計量動作
中は加熱シリンダ内の樹脂圧を外周から受けるこ
とによりセンタリングされることもあるが、多く
は片持はりの状態で自重の大きいスクリユを回転
させいてるためあるいは成形条件や樹脂の種類に
よつてはセンタリングが思うようになされず加熱
シリンダ内壁面とかじる場合があつた。(Prior art) During metering operation, the screw in a conventional molding device is sometimes centered by receiving the resin pressure in the heating cylinder from the outer periphery, but in most cases the screw, which has a large weight, is rotated in a cantilevered state. Because of this, or depending on the molding conditions or the type of resin, the centering could not be done as expected, and the inner wall surface of the heating cylinder could get stuck.
このことを第４図により述べると加熱シリンダ
１１内のフライト１２を有するスクリユ１３にお
いて、フライト１２の部分は加熱シリンダ１１と
のクリアランスは小さく従つて樹脂流速が速くな
るので樹脂１４の圧力は小さいが、フライト１２
以外の部分はクリアランスが大きく従つて樹脂流
速が遅いので樹脂圧は大きい。このためスクリユ
１３は図において左方へ押圧される偏圧を受けて
いる。また樹脂の送られる方向についても元側か
らフイード部・コンプレツシヨン部そしてメルト
部があり、特にフイード部では固体粒子群とメル
ト群とがあつて非等方性により均一な樹脂圧を得
ることが困難である。第５図は粉粒体の圧力とみ
かけ比重の変化線図であつて、圧力が10kg／ｃ
m2以上ではみかけ比重は0.9とほぼ一定であるが
圧力が1kg／ｃm2以下のときみかけ比重は0.5ない
し0.8と大きく変化し、フイード部のミゾ深サの
深いスクリユにおいてはみかけ比重の変化がスク
リユの変位置を増やすことになり加熱シリンダに
接することになる。 To explain this with reference to FIG. 4, in the screw 13 having flights 12 inside the heating cylinder 11, the clearance between the flights 12 and the heating cylinder 11 is small, and the resin flow rate is therefore high, so the pressure of the resin 14 is small, but , flight 12
In other parts, the clearance is large and the resin flow rate is slow, so the resin pressure is high. For this reason, the screw 13 is under biased pressure to the left in the figure. Also, regarding the direction in which the resin is fed, there are a feed section, a compression section, and a melt section from the source side, and in particular, in the feed section, solid particles and melt groups meet, and uniform resin pressure can be obtained due to anisotropy. is difficult. Figure 5 is a graph of changes in pressure and apparent specific gravity of powder and granular material, where the pressure is 10 kg/c.
Above m2 , the apparent specific gravity is almost constant at 0.9, but when the pressure is below 1kg/ cm2 , the apparent specific gravity changes greatly, from 0.5 to 0.8, and in the screws with deep grooves in the feed section, the apparent specific gravity changes. This increases the displacement of the screw and brings it into contact with the heating cylinder.
（考案の目的）
本考案のプラスチツク成形用装置は前述した欠
点を除去したものでその目的は、スクリユに作用
する樹脂流による偏圧をなくしかつ乱流を押え、
さらに固体粒子群の固体圧力による非等方性も押
えると共に、樹脂自身を支持点にすることにより
スクリユが加熱シリンダに接することを阻止しも
つて安定した混練作用の行なえるプラスチツク成
形用装置を提供することにある。(Purpose of the invention) The plastic molding apparatus of the invention eliminates the above-mentioned drawbacks.The purpose is to eliminate the uneven pressure caused by the resin flow acting on the screw, suppress the turbulent flow,
Furthermore, we provide a plastic molding device that can suppress the anisotropy caused by the solid pressure of the solid particle group, prevent the screw from coming into contact with the heating cylinder by using the resin itself as a support point, and perform a stable kneading action. It's about doing.
（考案の要点）
本考案のプラスチツク成形用装置は、スクリユ
のフイード部に凸起伏のノンフライト部を１箇所
或いは数箇所設け、前記ノンフライト部の外周部
と加熱シリンダ内周部との間のスクリユ軸に対し
直角方向の断面積で構成する樹脂通過面積を、そ
の前後のそれぞれのフライト間におけるフライト
に直角な方向の断面で形成するスクリユ溝と加熱
シリンダ内周部との間の断面積で構成するフライ
ト間樹脂通過面積に等しくするか或いは小さくし
たことを特徴にしている。(Key Points of the Invention) The plastic molding apparatus of the present invention has one or several convex non-flight parts in the feed part of the screw, and a gap between the outer periphery of the non-flight part and the inner periphery of the heating cylinder. The resin passage area is defined by the cross-sectional area perpendicular to the screw axis, and the cross-sectional area between the screw groove and the inner circumference of the heating cylinder, which is defined by the cross-section perpendicular to the flight between the front and rear flights. It is characterized in that it is made equal to or smaller than the resin passing area between the flights.
（考案の一実施例）
以下本考案について一実施例を示した第１図な
いし第３図により説明する。スクリユ２１のフイ
ード部Ａの中間には凸起部２２が１箇所或いは数
箇所設けてあり、この凸起部２２はフライト２３
を持たないノンフライト部であつて、樹脂の通過
面積をその前後のそれぞれのフライト２３の間に
おける通過面積に等しくするか或いは小さくなつ
ている。なお２４は加熱シリンダであり２５は原
料を入れるホツパーである。(One Embodiment of the Invention) The present invention will be explained below with reference to FIGS. 1 to 3 showing one embodiment. One or several protrusions 22 are provided in the middle of the feed portion A of the screw 21, and these protrusions 22
It is a non-flight part having no flight, and the passage area of the resin is made equal to or smaller than the passage area between the respective flights 23 before and after it. Note that 24 is a heating cylinder, and 25 is a hopper into which raw materials are put.
この構造にすることによりノンフライト部２２
はフライト２３がないため樹脂圧は円周方向にお
いて一定である。また狭いフライトクリアランス
による圧力降下のないことならびに乱流のないこ
とにより安定した樹脂の流れになつて、偏圧によ
るスクリユ２１の変位を押えてここを流れる樹脂
がスクリユ２１に対する支持点になる。 With this structure, the non-flight part 22
Because there is no flight 23, the resin pressure is constant in the circumferential direction. Further, the absence of pressure drop due to the narrow flight clearance and the absence of turbulence result in a stable flow of resin, and the resin flowing through this resists displacement of the screw 21 due to uneven pressure and serves as a support point for the screw 21.
（考案の効果）
本考案のプラスチツク成形用装置は以上説明し
たように、フイード部にフライトを持たず樹脂通
過面積をその前後のフライトの通過面積に等しく
するか、或いは小さくした凸起部を１箇所或いは
数箇所設けるという簡単な構成のためコストは低
い。そしてこの構成により凸起部にはフライトが
ないためこの部分での樹脂圧は一定であり、安定
した樹脂の流れによりスクリユへの偏圧を押えて
ここを流れる樹脂がスクリユに対する支持点にな
る。従つてスクリユは加熱シリンダに接すること
がなく寿命も伸びると共に安定した混練作用の行
える利点を有する。(Effects of the invention) As explained above, the plastic molding apparatus of the present invention does not have any flights in the feed section, and the resin passage area is made equal to the passage area of the flights before and after it, or the convex portion is made small. The cost is low because it has a simple configuration of providing one or several locations. With this configuration, since there are no flights in the convex portion, the resin pressure in this portion is constant, and the stable resin flow suppresses the biased pressure on the screw, and the resin flowing there serves as a support point for the screw. Therefore, the screw does not come into contact with the heating cylinder, which has the advantage of extending its life and providing stable kneading action.
第１図ないし第３図は本考案の一実施例を示し
第１図は縦断面図、第２図は第１図の２−２線断
面図、第３図は第１図の３−３線断面図、第４図
従来例の加熱シリンダとスクリユの軸直角方向断
面図、第５図は粉粒体の圧力によるみかけ比重の
変化線図である。
２１……スクリユ、２２……ノンフライト部、
２３……フライト、２４……加熱シリンダ。
Figures 1 to 3 show one embodiment of the present invention; Figure 1 is a longitudinal sectional view, Figure 2 is a sectional view taken along line 2-2 in Figure 1, and Figure 3 is a 3-3 line in Figure 1. Fig. 4 is a line sectional view, and Fig. 4 is a sectional view perpendicular to the axis of the heating cylinder and screw of the conventional example, and Fig. 5 is a diagram showing changes in apparent specific gravity due to pressure of granular material. 21...Skuriyu, 22...Non-Flight Club,
23...Flight, 24...Heating cylinder.
Claims (1)
部を１箇所或いは数箇所設け、前記ノンフライト
部の外周部と加熱シリンダ内周部との間のスクリ
ユ軸に対し直角方向の断面積で構成する樹脂通過
面積を、その前後のそれぞれのフライト間におけ
るフライトに直角な方向の断面で形成するスクリ
ユ溝と加熱シリンダ内周部との間の断面積で構成
するフライト間樹脂通過面積に等しくするか或い
は小さくしたプラスチツク成形用装置。 One or more convex non-flight parts are provided in the feed part of the screw, and the resin passage is formed by a cross-sectional area perpendicular to the screw axis between the outer periphery of the non-flight part and the inner periphery of the heating cylinder. The area is made equal to or smaller than the inter-flight resin passage area, which is formed by the cross-sectional area between the screw groove and the inner peripheral part of the heating cylinder, which is formed by the cross-section in the direction perpendicular to the flight between the front and rear flights. Equipment for plastic molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985043436U JPH0344508Y2 (en) | 1985-03-26 | 1985-03-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985043436U JPH0344508Y2 (en) | 1985-03-26 | 1985-03-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61160917U JPS61160917U (en) | 1986-10-06 |
| JPH0344508Y2 true JPH0344508Y2 (en) | 1991-09-19 |
Family
ID=30555100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985043436U Expired JPH0344508Y2 (en) | 1985-03-26 | 1985-03-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0344508Y2 (en) |
-
1985
- 1985-03-26 JP JP1985043436U patent/JPH0344508Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61160917U (en) | 1986-10-06 |
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