JPH0450170B2 - - Google Patents
Info
- Publication number
- JPH0450170B2 JPH0450170B2 JP61270213A JP27021386A JPH0450170B2 JP H0450170 B2 JPH0450170 B2 JP H0450170B2 JP 61270213 A JP61270213 A JP 61270213A JP 27021386 A JP27021386 A JP 27021386A JP H0450170 B2 JPH0450170 B2 JP H0450170B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- zone
- flight
- subflight
- weir
- 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 - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000004898 kneading Methods 0.000 description 6
- 239000012768 molten material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011295 pitch 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—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
- B29C48/50—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
- B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
〔発明の目的〕
(産業上の利用分野)
射出成形用スクリユに係るもので、ドライカラ
ー、キツドカラー、マスターバツチ等の顔料の分
散性の向上に関するものである。
(従来の技術)
プラスチツク材料を溶融し、混練や分散を向上
させるため第5図に示すような特公昭43−24493
号のようにスクリユ1にシリンダとの間に小間隙
を持つプランジヤ2を設け、同プランジヤ2の外
周面に貫通しない先止まりの条溝3及び4を各々
が連通しないように交互に逆方向に配置したも
の、あるいは第6図の実公開58−138613号に示す
ようにフイードゾーンF、コンプレツシヨンゾー
ンC、メータリングゾーンMを有するスクリユ1
1に於て、コンプレツシヨンゾーンCもしくはメ
ータリングゾーンMの少なくとも一方の所定範囲
にわたつて、1条もしくは複数条ねじのミキシン
グフライト12を設け、このフライト12の頂面
にはスクリユの軸方向と平行な深さが変化する溝
13を複数個設け、軸方向に相隣接する溝同志の
深さの変化が互いに逆になるように形成してなる
スクリユ、あるいは第7図の実公昭55−1810号に
示すように主フライト21から分岐したサブフラ
イト22が下流側の主フライト21に連結するよ
うなスクリユがある。
(発明が解決しようとする問題点)
前述の従来スクリユに於ては、十分な色分散を
得るには高背圧20Kgf/cm2以上をかける必要があ
つた。その結果可塑化能力の低下及び樹脂温度の
上昇をきたし生産性を低下及び成形品の品質低下
をもたらす欠点があつた。
本発明は高混練性により低背圧による高分散性
が得られるスクリユを提供することを目的とす
る。
〔発明の構成〕
(問題点を解決するための手段)
前述のような目的を達成するため高混練性、溶
融機能をサブフライトスクリユで行わせ、ミキシ
ング部で高い分散能力を与えるようにしたプラス
チツク成形用スクリユであつて、材料供給側から
材料吐出側の先端部にかけてフイードゾーン、コ
ンプレツシヨンゾーン、メータリングゾーンを形
成するプラスチツク成形用スクリユに於て、前記
メータリングゾーンの先部にシリンダとの間に小
間隙を持つプランジヤの外周面に、貫通しない先
止まり条溝の各々が連通しないように、交互に逆
方向に配置したミキシング部を設けると共に、前
記コンプレツシヨンあるいはメータリングゾーン
のいずれか一方、あるいは両ゾーンにまたがつて
少なくとも1カ所に、主フライトに対し僅かに低
く、主フライトのリード角より大きなリード角の
サブフライトを有し、前記サブフライトの始端部
及び終端部が軸方向に平行な堰となつて主フライ
トと接続し、堰はその下流側及び上流側に於て、
スクリユ溝の底面と直線又は曲線で連続的に滑ら
かに接続され、高さが前記サブフライトより僅か
に低いことを特徴とするプラスチツクの射出成形
用高分散スクリユとした。
(作用)
プラスチツク材料の混練や分散の向上を計るた
めミキシング部を設けて色分散を良くし、サブフ
ライトを設けてミキシング部による可塑化能力の
低下を補つている。即ち、本発明により、主フラ
イトにより形成される溝内の材料樹脂はサブフラ
イトの高さを主フライトより僅かに低くしたこと
により前記溝内の後部(主フライト全面に接する
部分)に溜る溶融材料は容易にサブフライトを乗
り越えてサブフライト背面と主フライト前面で形
成される溝内に入り溶融材料と未溶融材料が分離
され、未溶融材料は直接バレル内面に接して溶融
が進行する。一方溶融材料はミキシング部へ送ら
れ分散が容易に行われるので低い背圧で良好な分
散、混練が行われる。
(実施例)
第1図、第2図及び第3図により本発明の1実
施例を説明すると、材料供給口31から供給され
たプラスチツク材料をフイールドゾーンF、コン
プレツシヨンゾーンC、メータリングゾーンMの
順に矢印X方向に移送するものである。32は主
フライトでフイードゾーンFからメータリングゾ
ーンMまで等ピツチで連続して設けてある。33
はミキシング部でシリンダとの間に小間隙を有す
るプランジヤ状で外周面に貫通しない先止まりの
条溝34及び35を複数個設け、各々が連通しな
いように交互に逆方向に配置してある。
第2図は第1図Y部の拡大図で本発明のスクリ
ユの主要部を形成し主フライト32より高さが僅
かに低くリード角が大きいサブフライト36を設
けてあり、その始端部及び終端部に於て軸に平行
な堰37が主フライト32と接続している。よつ
て従来オープン式で見られたような材料が未溶融
のまゝ通過してしまうことがないように、必ず堰
を越え未溶融材料が前記堰37を越える時に溶融
されるようにしてある。従つて材料が滞留せずし
かも溶融が行われるよう、オープン式とクローズ
式の中間の性質を有するようになつている。更に
スクリユの外周面を覆うパレルから熱が良く伝わ
るように、堰37の始端部及び終端部は第3図に
示すように、スクリユ溝深さから次第に浅くなる
よう直線又は曲線で連続的に滑らかに接続してい
る。従つてこの部分に於て高混練性の効果をもた
せ、一方本スクリユのメータリングゾーンMの先
部に従来から高分散の特徴を有するミキシング部
を設けているので低背圧による高分散性が得られ
る効果を有する。
次に本発明によるスクリユ第1図と従来スクリ
ユ第8図、第9図、第10図の比較テストを行つ
た。
成形品;タライ(第4図に示す)重量315gr、
樹脂;PPにドライカラーを配合比0.1%、0.4
%、0.8%で混合
成形条件
スクリユ回転数:175rpm(MAX)
背圧:0、10、20Kgf/cm2
サイクル:射出5秒、冷却15秒、1サイクル34
秒
バレル温度:225℃
成形機;IS−550E(東芝機械製)型締力
550ton、スクリユ径φ75
前述のような成形条件で色分散状況の比較を色
差計で行つた結果、下記の表の如き結果を得た。
[Objective of the Invention] (Industrial Application Field) This invention relates to a screw for injection molding, and relates to improving the dispersibility of pigments in dry colors, hard colors, masterbatches, etc. (Prior art) In order to melt plastic materials and improve their kneading and dispersion, a Japanese Patent Publication No. 43-24493 as shown in Fig. 5 was used.
As shown in No. 1, a plunger 2 with a small gap between the screw 1 and the cylinder is provided, and grooves 3 and 4, which do not penetrate through the outer peripheral surface of the plunger 2, are arranged alternately in opposite directions so that they do not communicate with each other. A screwdriver 1 having a feed zone F, a compression zone C, and a metering zone M as shown in Fig.
1, a mixing flight 12 of one or more threads is provided over a predetermined range of at least one of the compression zone C or the metering zone M, and the top surface of this flight 12 is provided with a mixing flight 12 in the axial direction of the screw. A screw is formed by providing a plurality of grooves 13 whose depths change parallel to each other, and the depth changes of adjacent grooves in the axial direction are opposite to each other. As shown in No. 1810, there is a screw in which a sub-flight 22 branching off from a main flight 21 is connected to the main flight 21 on the downstream side. (Problems to be Solved by the Invention) In the above-mentioned conventional screw, it was necessary to apply a high back pressure of 20 Kgf/cm 2 or more to obtain sufficient color dispersion. As a result, the plasticizing ability decreases and the resin temperature increases, resulting in a decrease in productivity and a deterioration in the quality of molded products. It is an object of the present invention to provide a screw that can obtain high dispersibility due to low back pressure due to high kneading properties. [Structure of the invention] (Means for solving the problems) In order to achieve the above-mentioned objectives, high kneading performance and melting functions are performed by a sub-flight screw, and high dispersion ability is provided in the mixing section. A screw for plastic molding, which forms a feed zone, a compression zone, and a metering zone from the material supply side to the material discharge side, has a cylinder and a cylinder at the tip of the metering zone. On the outer circumferential surface of the plunger having a small gap between them, mixing sections are provided which are alternately arranged in opposite directions so that the non-penetrating first stop grooves do not communicate with each other. In one or both zones, at least one sub-flight has a sub-flight that is slightly lower than the main flight and has a lead angle larger than that of the main flight, and the starting and ending ends of the sub-flight are aligned with the axis. A weir parallel to the direction is connected to the main flight, and the weir is on the downstream and upstream sides of the
This high dispersion screw for plastic injection molding is characterized in that it is continuously and smoothly connected to the bottom surface of the screw groove by a straight line or a curve, and has a height slightly lower than the sub-flight. (Function) In order to improve the kneading and dispersion of plastic materials, a mixing section is provided to improve color dispersion, and a sub-flight is provided to compensate for the reduction in plasticizing ability caused by the mixing section. That is, according to the present invention, the material resin in the groove formed by the main flight is reduced by making the height of the sub-flight slightly lower than the main flight, so that the molten material that accumulates in the rear part of the groove (the part in contact with the entire surface of the main flight) is reduced. The material easily overcomes the sub-flight and enters the groove formed by the back surface of the sub-flight and the front surface of the main flight, separating the molten material from the unmelted material, with the unmelted material directly contacting the inner surface of the barrel and melting progresses. On the other hand, since the molten material is sent to the mixing section and easily dispersed, good dispersion and kneading can be achieved with low back pressure. (Embodiment) To explain one embodiment of the present invention with reference to FIGS. 1, 2, and 3, plastic material supplied from the material supply port 31 is transferred to a field zone F, a compression zone C, and a metering zone. The objects are transferred in the order of M in the direction of arrow X. 32 is the main flight, which is continuously provided from the feed zone F to the metering zone M at equal pitches. 33
In the mixing section, a plurality of plunger-shaped grooves 34 and 35 with a small gap between them and the cylinder, which do not penetrate through the outer circumferential surface, are provided, and are alternately arranged in opposite directions so that they do not communicate with each other. FIG. 2 is an enlarged view of section Y in FIG. 1, which forms the main part of the screw of the present invention, and is provided with a sub-flight 36 that is slightly lower in height than the main flight 32 and has a larger lead angle, and its starting and terminal ends. A weir 37 parallel to the axis connects the main flight 32 at a portion. Therefore, in order to prevent material from passing through unmelted as in the conventional open type, the unmelted material is always melted when it crosses the weir 37. Therefore, it is designed to have properties intermediate between an open type and a closed type so that the material does not stagnate and melts. Furthermore, in order to ensure that heat is transferred well from the pallet that covers the outer peripheral surface of the screw, the starting and ending ends of the weir 37 are continuously smooth in straight or curved lines that gradually become shallower from the depth of the screw groove, as shown in Figure 3. is connected to. Therefore, this part has the effect of high kneading performance, and on the other hand, since the mixing part, which has the characteristic of high dispersion, is provided at the tip of the metering zone M of this screw, high dispersion due to low back pressure is achieved. It has the effect that can be obtained. Next, a comparison test was conducted between the screw according to the present invention in FIG. 1 and the conventional screws in FIGS. 8, 9, and 10. Molded product: Tarai (shown in Figure 4) weight 315g, resin: PP and dry color blending ratio 0.1%, 0.4
%, 0.8% mixed molding conditions Screw rotation speed: 175 rpm (MAX) Back pressure: 0, 10, 20 Kgf/cm 2 cycles: injection 5 seconds, cooling 15 seconds, 1 cycle 34
Seconds Barrel temperature: 225℃ Molding machine: IS-550E (manufactured by Toshiba Machine) Mold clamping force
550 tons, Screw diameter φ75 As a result of comparing the color dispersion status using a color difference meter under the above-mentioned molding conditions, the results shown in the table below were obtained.
【表】
表中 ×:不良
△:まあゝ良
○:良好
以上のように本発明のスクリユが低背圧に20Kg
f/cm2以下に於ても高分散性を有している。[Table] In the table ×: Defective
△: Fairly good
○: Good As described above, the screw of the present invention has a low back pressure of 20 kg.
It has high dispersibility even at f/cm 2 or less.
第1図は本発明による1実施例を示す図。第2
図は第1図Y部の拡大図。第3図は第2図−
断面図。第4図は本発明と従来例との比較用のテ
スト製品の図。第5図は従来のミキシング部を有
するスクリユの図。第6図はミキシング部を有す
る他の従来例の図。第7図は更に他の従来スクリ
ユを示す図でサブフライトを有するスクリユの
図。第8図、第9図、第10図は従来のスクリユ
の図で第8図はコンプレツシヨンゾーンに溝始
端、終端がともに開いた短かいサブフライトを有
するスクリユの図。第9図はフルフライトにミキ
シング部を設けたスクリユの図。第10図はコン
プレツシヨンゾーンに溝始端、終端がともに開い
た短かいサブフライトを有し、先端にミキシング
部を設けたスクリユの図。
31……材料供給口、32……主フライト、3
3……ミキシング部、34,35……先止まり条
溝、36……サブフライト、37……堰、F……
フイードゾーン、C……コンプレツシヨンゾー
ン、M……メータリングゾーン。
FIG. 1 is a diagram showing one embodiment according to the present invention. Second
The figure is an enlarged view of section Y in Figure 1. Figure 3 is Figure 2-
Cross-sectional view. FIG. 4 is a diagram of a test product for comparison between the present invention and a conventional example. FIG. 5 is a diagram of a screw having a conventional mixing section. FIG. 6 is a diagram of another conventional example having a mixing section. FIG. 7 is a diagram showing still another conventional screw having sub-flights. FIGS. 8, 9, and 10 are diagrams of conventional screws, and FIG. 8 is a diagram of a screw having short subflights in the compression zone where both the groove start and end are open. Figure 9 is a diagram of a screwdriver with a mixing section in full flight. FIG. 10 is a diagram of a screw having short sub-flights in the compression zone with openings at both the groove start and end, and a mixing section at the tip. 31...Material supply port, 32...Main flight, 3
3...Mixing section, 34, 35...First stop groove, 36...Sub flight, 37...Weir, F...
Feed zone, C...Compression zone, M...Metering zone.
Claims (1)
フイドゾーン、コンプレツシヨンゾーン、メータ
リングゾーンを成するプラスチツク材料成形用ス
クリユにおいて、前記メーリングゾーンの先部に
シリンダとの間に小間〓を持つプランジヤの外周
面に、貫通しない先止まりの条溝を夫々連通しな
いように交互に逆方向に配置したミキシング部を
設けるとともに前記コンプレツシヨンあるいはメ
ータリングゾーンのいずれか一方、あるいは両ゾ
ーンにまたがつて少なくとも1カ所に、主フライ
トに対し僅かに低く、主フライトのリード角より
大きなリード角のサブフライトを有し、前記サブ
フライトの始端部および後端部において軸方向に
平行な堰となつて主フライトに接続している射出
成形用高分散スクリユ。 2 前記堰はその下流側および上流側において、
スクリユ溝の底面と直線または曲線で連続的に滑
らかに接続されていることを特徴とする前記特許
請求の範囲第1項記載のスクリユ。 3 前記堰は高さが前記サブフライトより僅かに
低いことを特徴とする前記特許請求の範囲第1項
および第2項記載のスクリユ。[Scope of Claims] 1. In a plastic material molding screw that forms a feed zone, compression zone, and metering zone from the material supply side to the material discharge side, there is a screw between the cylinder and the tip of the mailing zone. A mixing section is provided on the outer circumferential surface of the plunger having a booth, in which non-penetrating first-stop grooves are arranged alternately in opposite directions so as not to communicate with each other, and either the compression zone or the metering zone, or both. At least one subflight across the zone has a subflight that is slightly lower than the main flight and has a lead angle larger than the lead angle of the main flight, and is parallel to the axial direction at the starting and trailing ends of the subflight. A high dispersion screw for injection molding connects to the main flight as a weir. 2. On the downstream and upstream sides of the weir,
The screw according to claim 1, characterized in that the screw is continuously and smoothly connected to the bottom surface of the screw groove by a straight line or a curve. 3. The screw according to claims 1 and 2, wherein the height of the weir is slightly lower than the subflight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61270213A JPS63122513A (en) | 1986-11-13 | 1986-11-13 | High-dispersion screw for injection molding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61270213A JPS63122513A (en) | 1986-11-13 | 1986-11-13 | High-dispersion screw for injection molding |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63122513A JPS63122513A (en) | 1988-05-26 |
JPH0450170B2 true JPH0450170B2 (en) | 1992-08-13 |
Family
ID=17483113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61270213A Granted JPS63122513A (en) | 1986-11-13 | 1986-11-13 | High-dispersion screw for injection molding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63122513A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8900506B2 (en) | 2010-10-25 | 2014-12-02 | Mitsubishi Heavy Industries Plastic Technology | Plasticizing screw for injection molding and injection molding method using same |
WO2014065216A1 (en) | 2012-10-23 | 2014-05-01 | 矢崎総業株式会社 | Automotive injection-molded product |
JP6754018B1 (en) * | 2020-01-23 | 2020-09-09 | 中田エンヂニアリング株式会社 | Screws, extruders and extrusion methods |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49130953A (en) * | 1973-04-07 | 1974-12-16 | ||
JPS61144326A (en) * | 1984-12-19 | 1986-07-02 | Toshiba Mach Co Ltd | Plastic molding screw |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4999856U (en) * | 1972-12-22 | 1974-08-28 | ||
JPS58138613U (en) * | 1982-03-11 | 1983-09-17 | 株式会社神戸製鋼所 | Screw for polymer material extrusion |
JPS58143225U (en) * | 1982-03-24 | 1983-09-27 | 三菱重工業株式会社 | Skrill |
-
1986
- 1986-11-13 JP JP61270213A patent/JPS63122513A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49130953A (en) * | 1973-04-07 | 1974-12-16 | ||
JPS61144326A (en) * | 1984-12-19 | 1986-07-02 | Toshiba Mach Co Ltd | Plastic molding screw |
Also Published As
Publication number | Publication date |
---|---|
JPS63122513A (en) | 1988-05-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |