JPS6283122A - Injection molding machine - Google Patents

Injection molding machine

Info

Publication number
JPS6283122A
JPS6283122A JP22550685A JP22550685A JPS6283122A JP S6283122 A JPS6283122 A JP S6283122A JP 22550685 A JP22550685 A JP 22550685A JP 22550685 A JP22550685 A JP 22550685A JP S6283122 A JPS6283122 A JP S6283122A
Authority
JP
Japan
Prior art keywords
screw
diameter
cylinder
injection molding
cylindrical part
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
JP22550685A
Other languages
Japanese (ja)
Other versions
JPH0617048B2 (en
Inventor
Tatsumi Takahashi
達見 高橋
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.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co 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 Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP60225506A priority Critical patent/JPH0617048B2/en
Publication of JPS6283122A publication Critical patent/JPS6283122A/en
Publication of JPH0617048B2 publication Critical patent/JPH0617048B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • 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
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C2045/5004—Axially movable screw the forward screw end provided with an injection ram

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To permit metering operations to be made constant all the time without providing a back flow-preventive ring for a screw by using the screw head consisting of a cylinder of a diameter the same as or smaller than the groove diameter of the metering region of the screw and a conical portion subsequent to the cylinder. CONSTITUTION:An injection molding machine consists of a screw 1, a cylinder 2, a cylinder nozzle 3, a screw head 4, a cylindrical part 5, and a conical part 6. The diameter D of the screw 1 and the diameter D' of the cylindrical part 5 of the head 4 are in the relationship to meet D>D', and the length L' of the cylindrical part 5 is set optional. The back flow of resin during the pressure- holding period can thus be prevented. The diameter D' of the cylindrical part 5 is preferably similar to or smaller than the groove diameter DM of flight in the metering region of the screw 1. Metering operations can thus be made constant all the time without the needs to provide a back flow-preventive ring for the screw, and precise moldings can be obtained with good efficiency.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、超高分子量ポリエチレンを始めとする四弗化
エチレン、その他熔解時に高粘性を示す工業用のプラス
チックやその複合化された材料の成形を行う射出成形機
に関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to ultra-high molecular weight polyethylene, tetrafluoroethylene, other industrial plastics that exhibit high viscosity when melted, and composite materials thereof. This invention relates to an injection molding machine that performs molding.

（従来技術） 分子量が２００万〜６００万の超高分子量ポリエチレン
は、耐薬品性、耐衝撃性、耐寒性等に優れると共に自己
潤滑性を有するため、歯車、軸受等の工業用部品の材料
として極めて好適なものである。(Prior art) Ultra-high molecular weight polyethylene with a molecular weight of 2 million to 6 million is excellent in chemical resistance, impact resistance, cold resistance, etc., and has self-lubricating properties, so it is used as a material for industrial parts such as gears and bearings. This is extremely suitable.

このような超高分子量ポリエチレンによって工業用部品
等を成形する手段としては、射出成形、圧縮成形及び押
出成形が考えられるが、超高分子量ポリエチレンは、前
記したように分子量が極めて高いため、加熱しても粘性
が低くならず、流動性を示さないものである。Injection molding, compression molding, and extrusion molding are conceivable methods for molding industrial parts etc. using ultra-high molecular weight polyethylene, but as mentioned above, ultra-high molecular weight polyethylene has an extremely high molecular weight, so it cannot be heated. However, the viscosity does not decrease even when used, and it does not exhibit fluidity.

このような超高分子量ポリエチレンの成形には、従来は
スクリューのメータリング領域に逆流防止リングが設け
られている射出成形を用い、あるいは圧縮成形機、押出
し成形機（ラム押出し成形機）を用いていた。Conventionally, such ultra-high molecular weight polyethylene is molded using injection molding, in which a backflow prevention ring is provided in the metering area of the screw, or using a compression molding machine or an extrusion molding machine (ram extruder). Ta.

（発明が解決しようとする問題点） 従来の逆流防止リングを設けた射出成形機で超高分子量
ポリエチレンを射出成形する場合に、可塑化するとシリ
ンダー内で高剪断力がかかり、加熱による酸素化及び主
鎖の切断が発生して分子量が低下し、汎用のポリエチレ
ンになり、高分子量の状態で金型内のキャビティの細部
まで充填することは困難であった。(Problems to be Solved by the Invention) When ultra-high molecular weight polyethylene is injection molded using a conventional injection molding machine equipped with a backflow prevention ring, high shear force is applied in the cylinder when plasticized, causing oxygenation and The molecular weight of polyethylene decreases due to main chain scission, resulting in general-purpose polyethylene, and it is difficult to fill the cavities in molds with high molecular weight.

また、圧縮成形機、押出し成形機にあっても成形品の精
度はよくなく、その製゛造効率も低いものであった。Moreover, even with compression molding machines and extrusion molding machines, the precision of molded products is not good and the manufacturing efficiency is also low.

（問題点を解決するための手段） 超高分子量ポリエチレンによる高精度の射出成形品を得
るためには、射出工程で充分な射出・速度を樹脂に与え
ることと、樹脂の金型のキャビティへの充填過程におい
て、充分な圧力を与えることが必要である。特に賦形性
を向上させ、寸法精度を上げるためには、保圧工程での
樹脂圧の維持が重要になってくることが、超高分子量ポ
リエチレンの流動特性から判明し、種々検討した結果、
保圧工程において充分に樹脂圧を維持できる手段を、従
来の射出成形機のようにスクリューに逆流防止リングを
設けることなく、次のような構成にて解決した。(Means for solving the problem) In order to obtain high-precision injection molded products using ultra-high molecular weight polyethylene, it is necessary to give sufficient injection speed to the resin in the injection process and to inject the resin into the mold cavity. It is necessary to apply sufficient pressure during the filling process. In particular, in order to improve formability and increase dimensional accuracy, it became clear from the flow characteristics of ultra-high molecular weight polyethylene that maintaining resin pressure during the pressure holding process is important.As a result of various studies,
In order to maintain sufficient resin pressure during the pressure holding process, we have developed the following structure without providing a backflow prevention ring on the screw as in conventional injection molding machines.

すなわち、スクリューのスクリュー部に続くスクリュー
ヘッド部を、スクリューのメータリング領域の？ｊ６径
と同一か、またはそれより小さい径の円筒状部と、これ
に続く円錐状部とから構成したものである。In other words, the screw head section following the screw section of the screw, in the metering area of the screw? It is composed of a cylindrical portion having a diameter that is the same as or smaller than the j6 diameter, and a conical portion that follows the cylindrical portion.

（実施例） 以下、本発明の実施例を図面について説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

図面は、本発明の射出成形機の要部を断面にて示すもの
で、（１）はスクリュー、（２）はシリンダー（バレル
）、（３）はシリンダーノズルである。（４）はスクリ
ューヘッド部で、スクリュー部に続く円筒状部（５）と
、これに続く円錐状部（６）とにより構成されている。The drawing shows a cross section of the main parts of the injection molding machine of the present invention, in which (1) is a screw, (2) is a cylinder (barrel), and (3) is a cylinder nozzle. (4) is a screw head portion, which is composed of a cylindrical portion (5) following the screw portion and a conical portion (6) following this.

シリンダーノズル（３）はシリンダー（２）の先端部に
螺着されており、その内腔壁（７）はスクリューヘッド
部（４）の形状をしており、スクリュー（１）が前進し
て図示の状態となったとき、スクリューヘッド部（４）
の円筒状部（５）とシリンダーノズル（３）の内腔壁（
７）との間に形成される間隙部は、本発明の重要な部分
である樹脂圧発生領域部（８）となる部分である。この
樹脂圧発生領域部（８）は、図示のようにシリンダーノ
ズル（３）との間ではなく、シリンダー（２）との間で
あってもよい。The cylinder nozzle (3) is screwed onto the tip of the cylinder (2), and its lumen wall (7) has the shape of a screw head (4), and the screw (1) advances as shown in the figure. When the condition is reached, the screw head part (4)
of the cylindrical part (5) and the inner cavity wall of the cylinder nozzle (3) (
The gap formed between the resin pressure generating region (8) and the resin pressure generating region (8) is an important part of the present invention. The resin pressure generating region (8) may be located between the cylinder (2) and not the cylinder nozzle (3) as shown in the figure.

なお、（９）はノズル口、（１０）はロックナツトであ
る。In addition, (9) is a nozzle opening, and (10) is a lock nut.

従来の射出成形機の場合は、円筒状部（５）に相当する
部分は存在しないで、スクリュー部より直接円錐状部が
突設されている。その代わりシリンダー径と同程度の径
の逆流防止リングをスクリューヘッド部に設け、最大前
進したとしても、シリンダーの先端部で止まるように設
計されている。In the case of a conventional injection molding machine, there is no part corresponding to the cylindrical part (5), and a conical part is provided directly protruding from the screw part. Instead, a backflow prevention ring with a diameter similar to the cylinder diameter is installed on the screw head, and is designed to stop at the tip of the cylinder even if it moves forward to its maximum.

本発明は、スクリュー（１）の直径をＤ、スクリューヘ
ッド部（４）の円筒状部（５）の直径Ｄ゛、その長さを
Ｌ゛とじたとき、Ｄ＞Ｄ’の条件を満足し、かつ任意の
長さＬ゛を設けることにより保圧時の樹脂の逆流を防止
するものである。The present invention satisfies the condition D>D', where D is the diameter of the screw (1), D is the diameter of the cylindrical part (5) of the screw head part (4), and L is the length thereof. , and by providing an arbitrary length L', backflow of the resin during pressure retention is prevented.

さらに、樹脂圧発生領域部（９）について説明すると、
円筒状部の直径Ｄ′は、スクリュー（１）のメータリン
グ領域のフライトの溝径ＤＭと同等か、それより小さい
ことが好ましい。Furthermore, the resin pressure generation area (9) will be explained as follows.
The diameter D' of the cylindrical portion is preferably equal to or smaller than the groove diameter DM of the flights in the metering region of the screw (1).

長さＬ”に関しては、１／１０　Ｄ　’　　≦Ｌ”　≦
１０Ｄ’であり好ましくは１／２Ｄ″≦Ｌ′≦３／２　
Ｄ’である。Regarding the length L", 1/10 D'≦L" ≦
10D', preferably 1/2D''≦L'≦3/2
It is D'.

スクリューヘッド部（４）はスクリュー（１）より分離
できるようにすることもできるが、この場合には、使用
する樹脂の性質に応じて■２”の長さを変えたスクリュ
ーヘッド（４）を用意しておき、任意に保圧力の発生を
調整することも可能である。The screw head part (4) can be separated from the screw (1), but in this case, the screw head (4) with a length of 2" can be used depending on the properties of the resin used. It is also possible to prepare one and adjust the generation of the holding force as desired.

スクリュー（１）による圧縮比は、１．３〜２．０であ
ることが適当であり、スクリュー（１）の正常は任意の
ものであってもよいが、好ましくは下記のとおりである
。゛ スクリューの長さしと直径りとの比Ｌ／Ｄは、１０〜２
５、特に１５〜２０が好ましく、またスクリュ−のピッ
チＰは、Ｐ＝πＤ　ｔａｎ　θで決定されるが、θの値
をもって示すならば１０°〜１８°、特に１１．５”〜
１４．５°であることが好ましい。The compression ratio of the screw (1) is suitably 1.3 to 2.0, and the normality of the screw (1) may be arbitrary, but preferably as follows.゛The ratio L/D of the length and diameter of the screw is 10 to 2
5, particularly preferably 15 to 20, and the pitch P of the screw is determined by P=πD tan θ, but if expressed by the value of θ, it is 10° to 18°, particularly 11.5” to
Preferably, the angle is 14.5°.

スクリューはフィーダ領域（ＦＺ）　、コンプレッショ
ン領域（ＣＺ）　、メータリング領域（ＭＺ）の３領域
に別けることができるが、スクリューの長さしに対する
各領域の割合は、 １／３Ｌ≦ＦＺ≦１／２　Ｌ、１／６　Ｌ≦ＣＺ≦１／
３Ｌ、１／６Ｌ≦ＭＺ≦１／３Ｌ であることが好ましい条件である。The screw can be divided into three regions: feeder region (FZ), compression region (CZ), and metering region (MZ), and the ratio of each region to the length of the screw is 1/3L≦FZ≦1/ 2 L, 1/6 L≦CZ≦1/
The preferred conditions are 3L, 1/6L≦MZ≦1/3L.

以上の条件は、炭素繊維、アラミド繊維、ガラス繊維で
複合化した超高分子量ポリエチレン、セラミック粉体で
複合化した超高分子量ポリエチレン、さらには弗素樹脂
（四弗化エチレン）系樹脂の射出成形にも通用できるこ
とは言うまでもない。The above conditions apply to injection molding of ultra-high molecular weight polyethylene composited with carbon fiber, aramid fiber, and glass fiber, ultra-high molecular weight polyethylene composited with ceramic powder, and even fluororesin (tetrafluoroethylene)-based resin. Needless to say, it can also be used.

次にスクリューの径を１８鶴として、射出圧を４０００
ｋｇ／ａｊまで上げることができるようにして、外径１
３ｍｍ、内径５ｆｉ、厚さ４ｗｍの超高分子量ポリエチ
レンの軸受を射出成形するにあたり、下記のような条件
のもとに実施した。Next, the diameter of the screw was set to 18 Tsuru, and the injection pressure was set to 4000.
kg/aj, with an outer diameter of 1
Injection molding of an ultra-high molecular weight polyethylene bearing having a diameter of 3 mm, an inner diameter of 5 fi, and a thickness of 4 wm was carried out under the following conditions.

樹脂圧発生領域部（９）における円筒状部（５）の直径
Ｄ゛を１４ｍ、長さＬ′を１４鶴とし、シリンダー（２
）の温度設定は、メータリング領域を２４０℃に、コン
プレッション領域を１７０℃に、フィーダ領域を７０℃
に初期設定し、後はファンにより強制冷却を行った。The diameter D'' of the cylindrical part (5) in the resin pressure generation area (9) is 14 m, the length L' is 14 m, and the cylinder (2
) temperature settings are 240°C for the metering area, 170°C for the compression area, and 70°C for the feeder area.
After initial setting, forced cooling was performed using a fan.

スクリューの回転数は１６６ｒｐａ＋、計量は２４ｍｍ
、背圧は初期１０鶴をゲージ圧で１０ｋｓｒ／ｃｆｆｌ
、残りを５ｋｇ／−とした。The rotation speed of the screw is 166rpa+, and the measurement is 24mm.
, the back pressure is 10ksr/cffl in gauge pressure for the initial 10tsuru.
, and the remainder was set at 5 kg/-.

射出速度（スクリューの前進速度）は、初速１００　ｍ
／ｓｅｃ　、終速１５ｍｍ／ｓｅｃで行い、保圧はスト
ロークエンドの５ｆｉ手前で自動的に切り換えるように
した。Injection speed (screw forward speed) is initial speed 100 m
/sec, with a final speed of 15mm/sec, and the holding pressure was automatically switched 5fi before the stroke end.

初期の保圧は、キャビテイ圧で３４００　ｋｇ　／　ｃ
ｉ　。The initial holding pressure is 3400 kg/c in cavity pressure.
i.

保圧時間９．３秒間の間に徐々に除圧し、最終圧は４５
０　ｋｇ／ｃｄとした。The pressure was gradually released during the holding time of 9.3 seconds, and the final pressure was 45.
It was set to 0 kg/cd.

また金型温度は６２℃とし、金型内の軸受のキャビティ
数は４個取りとした。The mold temperature was 62° C., and the number of bearing cavities in the mold was four.

その結果は、１０００シヨツトしたもののうちから、１
００ショット分を任意にサンプリングしたところ、金型
のキャビティ間の誤差をも含めて、従前のものでは成形
品の外径精度±１００μ信、内径で±８０μｍであり、
かつひげが生じていたが、今回の本発明による成形では
、外径精度±１０μ渭であり、かつひけに関しては、目
視では発生が確認できなかった。The result is 1 out of 1000 shots.
When we arbitrarily sampled 00 shots, we found that with the previous model, the accuracy of the outside diameter of the molded product was ±100μm, and the inside diameter was ±80μm, including the error between the mold cavities.
However, in the molding according to the present invention, the outer diameter accuracy was ±10 μm, and no sink marks were visually confirmed.

（発明の効果） 本発明は、スクリューヘッド部を、スクリューのメータ
リング領域の溝径と同一か、またはそれより小さい径の
円筒状部と、これに続く円錐部をもって構成したから、
従来のように逆流防止リングのスクリューの軸方向への
動きによる溶解樹脂の不安定な計量はなく、常に計量を
一定にすることができると共に、シリンダーヘッドと協
働して射出充填されたキャビティ内の樹脂に充分な保圧
をかけることができることにより、より精密な成形品を
得ることができる。(Effects of the Invention) In the present invention, since the screw head portion is configured with a cylindrical portion having a diameter equal to or smaller than the groove diameter of the metering area of the screw, and a conical portion following the cylindrical portion,
Unlike conventional methods, there is no unstable metering of melted resin due to the axial movement of the screw of the backflow prevention ring, and the metering can always be constant. By applying sufficient holding pressure to the resin, more precise molded products can be obtained.

また、形状、構造が極めて単純なため、高粘性を示す樹
脂に対しても、安定した機能を発揮することができる。Furthermore, since the shape and structure are extremely simple, it can exhibit stable functionality even with resins exhibiting high viscosity.

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

図面は本発明の射出成形機の要部の断面図である。 符号　１・・・・スクリュー ２・・・・シリンダー ３・・・・シリンダーノズル ４・・・・スクリューヘッド部 ５・・・・円筒状部 ６・・・・円錐状部 ７・・・・シリンダーノズルの内腔璧 ８・・・・樹脂圧発生領域部 ９・・・・ノズルロ The drawing is a sectional view of the main parts of the injection molding machine of the present invention. Code 1...screw 2...Cylinder 3...Cylinder nozzle 4...Screw head part 5...Cylindrical part 6...Conical part 7...Inner wall of cylinder nozzle 8...Resin pressure generation area 9...Nozzlero

Claims (2)

【特許請求の範囲】[Claims] （１）スクリューのスクリュー部に続くスクリューヘッ
ド部を、スクリューのメータリング領域の溝径と同一か
、またはそれより小さい径の円筒状部と、これに続く円
錐部とから構成されていることを特徴とする射出成形機
。(1) The screw head part that follows the screw part of the screw is composed of a cylindrical part with a diameter that is the same as or smaller than the groove diameter of the metering area of the screw, and a conical part that follows this. Characteristic injection molding machine. （２）シリンダーノズルの内腔の形状が、スクリューヘ
ッド部の形状と一致して嵌合するように成形されている
ことを特徴とする特許請求の範囲第１項記載の射出成形
機。(2) The injection molding machine according to claim 1, wherein the shape of the inner cavity of the cylinder nozzle is formed so as to match and fit with the shape of the screw head portion.
JP60225506A 1985-10-09 1985-10-09 Injection molding machine Expired - Lifetime JPH0617048B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60225506A JPH0617048B2 (en) 1985-10-09 1985-10-09 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60225506A JPH0617048B2 (en) 1985-10-09 1985-10-09 Injection molding machine

Publications (2)

Publication Number Publication Date
JPS6283122A true JPS6283122A (en) 1987-04-16
JPH0617048B2 JPH0617048B2 (en) 1994-03-09

Family

ID=16830384

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60225506A Expired - Lifetime JPH0617048B2 (en) 1985-10-09 1985-10-09 Injection molding machine

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0389642A1 (en) * 1988-09-28 1990-10-03 Dai Nippon Insatsu Kabushiki Kaisha Method for producing a sliding member
JP2008089264A (en) * 2006-10-04 2008-04-17 Matsushita Electric Ind Co Ltd External wall terminal ventilation opening
JP2008215743A (en) * 2007-03-06 2008-09-18 Matsushita Electric Ind Co Ltd External wall terminal ventilation opening
CN103507237A (en) * 2013-09-27 2014-01-15 江苏维达机械有限公司 Machine barrel screw for injection molding equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3250183B2 (en) 1999-01-18 2002-01-28 日精樹脂工業株式会社 Injection equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS609723A (en) * 1983-06-30 1985-01-18 Dainippon Printing Co Ltd Injection-molded article, injection molding method and injection molding machine
JPS6044317A (en) * 1983-08-20 1985-03-09 Japan Steel Works Ltd:The Injection molding machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS609723A (en) * 1983-06-30 1985-01-18 Dainippon Printing Co Ltd Injection-molded article, injection molding method and injection molding machine
JPS6044317A (en) * 1983-08-20 1985-03-09 Japan Steel Works Ltd:The Injection molding machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0389642A1 (en) * 1988-09-28 1990-10-03 Dai Nippon Insatsu Kabushiki Kaisha Method for producing a sliding member
EP0653284A2 (en) * 1988-09-28 1995-05-17 Dai Nippon Insatsu Kabushiki Kaisha Sliding members
EP0653284A3 (en) * 1988-09-28 1995-10-25 Dainippon Printing Co Ltd Sliding members.
EP0857564A2 (en) * 1988-09-28 1998-08-12 Dai Nippon Insatsu Kabushiki Kaisha Sliding member
EP0857564A3 (en) * 1988-09-28 1999-07-07 Dai Nippon Insatsu Kabushiki Kaisha Sliding member
JP2008089264A (en) * 2006-10-04 2008-04-17 Matsushita Electric Ind Co Ltd External wall terminal ventilation opening
JP2008215743A (en) * 2007-03-06 2008-09-18 Matsushita Electric Ind Co Ltd External wall terminal ventilation opening
CN103507237A (en) * 2013-09-27 2014-01-15 江苏维达机械有限公司 Machine barrel screw for injection molding equipment

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