JPH07100873A - Screw for injection molding machine - Google Patents

Screw for injection molding machine

Info

Publication number
JPH07100873A
JPH07100873A JP5273232A JP27323293A JPH07100873A JP H07100873 A JPH07100873 A JP H07100873A JP 5273232 A JP5273232 A JP 5273232A JP 27323293 A JP27323293 A JP 27323293A JP H07100873 A JPH07100873 A JP H07100873A
Authority
JP
Japan
Prior art keywords
screw
groove
flight
molding material
injection molding
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
Application number
JP5273232A
Other languages
Japanese (ja)
Other versions
JP3157966B2 (en
Inventor
Hideaki Nakajima
英昭 中島
Takenori Ishino
武則 石野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP27323293A priority Critical patent/JP3157966B2/en
Publication of JPH07100873A publication Critical patent/JPH07100873A/en
Application granted granted Critical
Publication of JP3157966B2 publication Critical patent/JP3157966B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/59Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/53Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk

Abstract

PURPOSE:To shorten a staying time of a molding material in a heating cylinder without impairing an effective ejection amount and a scuffing preventing function per one revolution. CONSTITUTION:A screw 1 has a screw groove 3 of substantially the same pitch P and its groove depth is gradually reduced in depth from a supply unit to a metering unit similarly to a conventional screw, and the flight width F of a flight 2 is set to a range of 0.3 to 0.5 times as large as the diameter D of the screw 1. Thus, although a depth of the groove 3 is of a size equivalent to that of a conventional screw, a staying amount of a molding material in a heating cylinder decreases and hence the staying time is shortened. Accordingly, a heat history scarcely affects the screw, and discoloring, decomposition of the material can be prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、射出成形機の可塑化装
置に用いられる射出成形機用スクリュに関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine screw used in a plasticizing device of an injection molding machine.

【0002】[0002]

【従来の技術】従来の射出成形機用スクリュは、図3に
示すように、1回転当たりの有効押出量の向上とかじり
防止を実現するため、スクリュ21のフライト22のフ
ライト幅F0 をスクリュ21の直径D0 の0.2倍以下
に設定されており、後端部側から順次供給部24、圧縮
部25および計量部26を備えている。
2. Description of the Related Art As shown in FIG. 3, a conventional screw for an injection molding machine has a flight width F 0 of the flight 22 of the screw 21 in order to improve the effective extrusion amount per rotation and prevent galling. The diameter 21 is set to 0.2 times or less of the diameter D 0 , and the supply unit 24, the compression unit 25, and the measuring unit 26 are sequentially provided from the rear end side.

【0003】供給部24は供給された成形材料を予熱し
つつ前方へ搬送する役割を担う区間であり、スクリュ溝
23の深さは他の部分に比較して深く、その溝方向に対
して垂直な断面の断面積は前方へ行く少し減少してい
る。
The supply section 24 is a section that plays a role of pre-heating the supplied molding material while conveying it forward, and the depth of the screw groove 23 is deeper than that of other portions and is perpendicular to the groove direction. The cross-sectional area of the large cross section decreases a little toward the front.

【0004】圧縮部25は成形材料にせん断作用を与え
つつ図示しない加熱シリンダからの熱を伝えて溶融させ
る役割を担う区間であり、スクリュ溝23の深さおよび
その溝方向に対して垂直な断面の断面積が比較的急激に
減少している。
The compression section 25 is a section which plays a role of transmitting heat from a heating cylinder (not shown) and melting it while giving a shearing action to the molding material, and a section perpendicular to the depth of the screw groove 23 and its groove direction. The cross-sectional area of is decreasing relatively sharply.

【0005】計量部26は、溶融した成形材料を混練し
て均質にする役割を担う区間であって、スクリュ溝23
の深さは浅くその溝方向に対して垂直な断面積はほとん
ど変化していない。
The metering section 26 is a section which plays a role of kneading and homogenizing the molten molding material, and the screw groove 23.
Is shallow and the cross-sectional area perpendicular to the groove direction is almost unchanged.

【0006】[0006]

【発明が解決しようとする課題】上記従来の技術では、
スクリュのスクリュ溝によって形成された凹所全体の容
積(以下、「スクリュ溝の全容積」という。)が大きい
ため、加熱シリンダ中に滞留する成形材料の量も多い。
したがって、1ショット当たりのサイクルが長時間とな
る厚肉の成形品の射出成形時においては、加熱シリンダ
内において多量の成形材料が長時間滞留し、変色や分解
を起こすおそれがある。また、容積の大きな成形品を射
出成形するように設計された射出成形機で、容積の小さ
い成形品を射出成形する場合は、1ショット当たりの射
出量が少ないため、その分加熱シリンダ内に長時間成形
材料が滞留して変色や分解を起こすという問題点があ
る。
SUMMARY OF THE INVENTION In the above conventional technique,
Since the volume of the entire recess formed by the screw groove of the screw (hereinafter referred to as “total volume of the screw groove”) is large, the amount of molding material retained in the heating cylinder is large.
Therefore, during injection molding of a thick molded product in which the cycle per shot is long, a large amount of molding material may stay in the heating cylinder for a long time, causing discoloration or decomposition. In addition, when using an injection molding machine designed to injection-mold a large-volume molded product, when injection-molding a small-volume molded product, the amount of injection per shot is small, and therefore the heating cylinder needs to be lengthened accordingly. There is a problem that the molding material stays for a period of time, causing discoloration and decomposition.

【0007】本発明は、上記従来の技術の有する問題点
に鑑みてなされたものであって、1回転当たりの有効押
出量とかじり防止機能を損なわずに加熱シリンダ内にお
ける成形材料の滞留時間を短縮することができる射出成
形機用スクリュを実現することを目的とするものであ
る。
The present invention has been made in view of the above-mentioned problems of the prior art, and the retention time of the molding material in the heating cylinder is maintained without impairing the effective extrusion amount per rotation and the galling prevention function. The object is to realize a screw for an injection molding machine that can be shortened.

【0008】[0008]

【課題を解決するための手段】上記の目的を達成するた
め、本発明の射出成形機用スクリュは、スクリュのフラ
イトのフライト幅を前記スクリュの直径の0.3倍乃至
0.5倍の範囲内としたことを特徴とするものである。
In order to achieve the above object, in the screw for an injection molding machine of the present invention, the flight width of the flight of the screw is in the range of 0.3 to 0.5 times the diameter of the screw. It is characterized in that the inside.

【0009】[0009]

【作用】スクリュのフライトのフライト幅を、前記スク
リュの直径の0.3倍乃至0.5倍の範囲内とすること
によって、スクリュのフライトのピッチを大きくした
り、スクリュ溝の溝深さを浅くしなくても成形材料の加
熱シリンダ内における滞留時間を短縮することができ
る。
By adjusting the flight width of the flight of the screw within the range of 0.3 to 0.5 times the diameter of the screw, the flight pitch of the screw is increased and the groove depth of the screw groove is increased. The residence time of the molding material in the heating cylinder can be shortened without making it shallow.

【0010】[0010]

【実施例】本発明の実施例を図面に基いて説明する。Embodiments of the present invention will be described with reference to the drawings.

【0011】図1は本発明の第1実施例の射出成形機用
スクリュを示す模式平面図である。スクリュ1は、ほぼ
同一ピッチPのスクリュ溝3を有し、その溝深さは従来
のスクリュと同様に供給部から計量部にかけて除々に浅
くなっているが、フライト2のフライト幅Fはスクリュ
1の直径Dの0.3倍乃至0.5倍の範囲内に設定され
ている。このため、スクリュ溝3の溝深さは従来のスク
リュと同等の大きさであるにもかかわらず、スクリュ全
体でみるとスクリュ溝3の全容積が減少するため、加熱
シリンダ内における成形材料の滞留量が少なくなりひい
ては滞留時間が短縮されて熱履歴を受けにくくなり、成
形材料の変色や分解が防止されてコンタミの発生が少な
くなる。
FIG. 1 is a schematic plan view showing a screw for an injection molding machine according to a first embodiment of the present invention. The screw 1 has screw grooves 3 having substantially the same pitch P, and the groove depth thereof gradually becomes shallower from the supply unit to the measuring unit as in the conventional screw, but the flight width F of the flight 2 is the screw 1 The diameter D is set to 0.3 to 0.5 times. Therefore, even though the groove depth of the screw groove 3 is the same as that of the conventional screw, the entire volume of the screw groove 3 is reduced as a whole of the screw, so that the molding material stays in the heating cylinder. As a result, the amount is reduced, the residence time is shortened, thermal history is less likely to occur, and discoloration or decomposition of the molding material is prevented, so that the occurrence of contamination is reduced.

【0012】ここで、フライト2のフライト幅Fがスク
リュ1の直径Dの0.3倍よりも小さいと、スクリュ溝
の全容積が大きくなって滞留時間が長くなり、フライト
幅Fがスクリュ1の直径Dの0.5倍より大きいと、1
回転当たりの有効押出量が少なくなりすぎるとともにか
じりが発生する。
When the flight width F of the flight 2 is smaller than 0.3 times the diameter D of the screw 1, the total volume of the screw groove becomes large and the residence time becomes long, so that the flight width F of the screw 1 becomes larger. Greater than 0.5 times the diameter D, 1
The effective extrusion amount per rotation becomes too small and galling occurs.

【0013】図2は本発明の第2実施例の射出成形機用
スクリュを使用した可塑化装置の主要部の模式断面図で
ある。
FIG. 2 is a schematic cross-sectional view of a main part of a plasticizing device using a screw for an injection molding machine according to a second embodiment of the present invention.

【0014】本実施例のスクリュ11は、加熱シリンダ
14のホッパ15の導入口15aの近傍のいわゆる供給
部にフライト幅の小さいフライト12aを設けた点が第
1実施例と異なるのみであってその他は同様であるので
その説明は省略する。
The screw 11 of this embodiment is different from that of the first embodiment only in that a flight 12a having a small flight width is provided in a so-called supply portion near the introduction port 15a of the hopper 15 of the heating cylinder 14. Are the same, so the description thereof will be omitted.

【0015】本実施例では、供給部における固体状態の
成形材料の喰込みが良好となる。
In this embodiment, the solid-state molding material is well absorbed in the supply section.

【0016】[0016]

【発明の効果】本発明は、上述のとおり構成されている
ので、次に記載するような効果を奏する。
Since the present invention is configured as described above, it has the following effects.

【0017】スクリュのフライトのフライト幅をスクリ
ュの直径の0.3倍乃至0.5倍の範囲内としたので、
上述した従来の射出成形機用スクリュに比較して加熱シ
リンダ内における成形材料の滞留量が少なくなりひいて
は滞留時間が短縮されるために熱履歴を受けにくく、前
記成形材料の変色や分解が防止されてコンタミの発生が
少なくなる。また、充分なせん断力およびシリンダ熱を
受けることができるため、成形材料の混練度が向上し顔
料等の分散性が良好となる。
Since the flight width of the flight of the screw is set within the range of 0.3 to 0.5 times the diameter of the screw,
Compared with the above-mentioned conventional screw for injection molding machine, the amount of the molding material staying in the heating cylinder is reduced and the staying time is shortened, so that it is less susceptible to thermal history, and discoloration or decomposition of the molding material is prevented. Therefore, the occurrence of contamination is reduced. Moreover, since sufficient shearing force and cylinder heat can be received, the degree of kneading of the molding material is improved and the dispersibility of the pigment and the like is improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1実施例の射出成形機用スクリュを
示す模式平面図である。
FIG. 1 is a schematic plan view showing a screw for an injection molding machine according to a first embodiment of the present invention.

【図2】本発明の第2実施例の射出成形機用スクリュを
使用した可塑化装置の主要部の模式部分断面図である。
FIG. 2 is a schematic partial cross-sectional view of a main part of a plasticizing device using a screw for an injection molding machine according to a second embodiment of the present invention.

【図3】従来の射出成形機用スクリュを示す模式平面図
である。
FIG. 3 is a schematic plan view showing a conventional screw for an injection molding machine.

【符号の説明】[Explanation of symbols]

1,11 スクリュ 2,12 フライト 3,13 スクリュ溝 D スクリュの直径 F フライト幅 P ピッチ 1,11 Screw 2,12 Flight 3,13 Screw groove D Screw diameter F Flight width P Pitch

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 スクリュ(1)のフライト(2)のフラ
イト幅(F)を前記スクリュ(1)の直径(D)の0.
3倍乃至0.5倍の範囲内としたことを特徴とする射出
成形機用スクリュ。
1. The flight width (F) of the flight (2) of the screw (1) is set to 0.degree. Of the diameter (D) of the screw (1).
A screw for an injection molding machine, characterized in that it is in a range of 3 times to 0.5 times.
JP27323293A 1993-10-05 1993-10-05 Screw for injection molding machine Expired - Fee Related JP3157966B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27323293A JP3157966B2 (en) 1993-10-05 1993-10-05 Screw for injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27323293A JP3157966B2 (en) 1993-10-05 1993-10-05 Screw for injection molding machine

Publications (2)

Publication Number Publication Date
JPH07100873A true JPH07100873A (en) 1995-04-18
JP3157966B2 JP3157966B2 (en) 2001-04-23

Family

ID=17524967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27323293A Expired - Fee Related JP3157966B2 (en) 1993-10-05 1993-10-05 Screw for injection molding machine

Country Status (1)

Country Link
JP (1) JP3157966B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009286097A (en) * 2008-06-02 2009-12-10 Sekisui Chem Co Ltd Screw and manufacturing process for molding
WO2016152853A1 (en) * 2015-03-25 2016-09-29 住友重機械工業株式会社 Injection device and screw
WO2016152858A1 (en) * 2015-03-25 2016-09-29 住友重機械工業株式会社 Injection device and screw
EP3482906A1 (en) * 2017-11-08 2019-05-15 Sang Kyu Joo Screw for extrusion molding machine and injection molding machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009286097A (en) * 2008-06-02 2009-12-10 Sekisui Chem Co Ltd Screw and manufacturing process for molding
WO2016152853A1 (en) * 2015-03-25 2016-09-29 住友重機械工業株式会社 Injection device and screw
WO2016152858A1 (en) * 2015-03-25 2016-09-29 住友重機械工業株式会社 Injection device and screw
JP2016182687A (en) * 2015-03-25 2016-10-20 住友重機械工業株式会社 Injection device and screw
JP2016182688A (en) * 2015-03-25 2016-10-20 住友重機械工業株式会社 Injection device and screw
CN107428052A (en) * 2015-03-25 2017-12-01 住友重机械工业株式会社 Injection device and screw rod
CN107428052B (en) * 2015-03-25 2020-03-03 住友重机械工业株式会社 Injection device and screw
EP3482906A1 (en) * 2017-11-08 2019-05-15 Sang Kyu Joo Screw for extrusion molding machine and injection molding machine

Also Published As

Publication number Publication date
JP3157966B2 (en) 2001-04-23

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