JPH0466643A - Screw for kneading and extruding machine for synthetic resin - Google Patents
Screw for kneading and extruding machine for synthetic resinInfo
- Publication number
- JPH0466643A JPH0466643A JP2176599A JP17659990A JPH0466643A JP H0466643 A JPH0466643 A JP H0466643A JP 2176599 A JP2176599 A JP 2176599A JP 17659990 A JP17659990 A JP 17659990A JP H0466643 A JPH0466643 A JP H0466643A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- nitrides
- carbides
- synthetic resin
- kneading
- 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.)
- Pending
Links
- 238000004898 kneading Methods 0.000 title claims abstract description 14
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 10
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 10
- 150000001247 metal acetylides Chemical class 0.000 claims abstract description 12
- 150000004767 nitrides Chemical class 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000003786 synthesis reaction Methods 0.000 claims 1
- 239000011159 matrix material Substances 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 229910052721 tungsten Inorganic materials 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 3
- -1 carbon nitrides Chemical class 0.000 abstract 2
- 239000010953 base metal Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 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
- B29C48/507—Screws characterised by the material or their manufacturing process
- B29C48/509—Materials, coating or lining therefor
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、合成樹脂混練押出機等用のスクリュに関する
もので、特にシリカなどの充填材を多量に混入したエポ
キシ樹脂ペレット製造時の混練押出機等、特に耐摩耗性
、靭性強度に優れたスクリュに関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a screw for use in a synthetic resin kneading extruder, etc., and particularly for kneading and extrusion during the production of epoxy resin pellets mixed with a large amount of filler such as silica. This invention relates to screws with excellent wear resistance, toughness, and strength.
ＩＣ装置のモールディング用等、高充填材入り合成樹脂
のベレット製造における混練押出機用スクリュは、樹脂
充填材等の原料を均一に混合するため、特に高い耐摩耗
性が要求される。Screws for kneading extruders used in the production of pellets of highly filled synthetic resins, such as those for molding IC devices, are required to have particularly high wear resistance in order to uniformly mix raw materials such as resin fillers.
従来、これらに対し５ＫＤＩＩに代表される冷間ダイス
鋼製が使用されてきた。しかし、混線押出されるエポキ
シ樹脂などは、最終的に７ｏ〜８０ｗｔ％と多量のシリ
カ分を配合されるため、スクリュの使用面が早期に摩滅
し、短時間で寿命に至り、また摩耗粉等の混入により製
造された樹脂の絶縁性を低下するという問題が合った。Conventionally, cold die steel such as 5KDII has been used for these. However, epoxy resins etc. that are cross-extruded are eventually mixed with a large amount of silica (7o~80wt%), so the screw surface wears out quickly, reaching the end of its service life in a short time, and also produces wear particles. The problem of reducing the insulation properties of the manufactured resin due to the contamination of the resin was solved.
また、上記用途用スクリュは、その摩耗の激しさ、混線
条件変更の必要から、一般に第１図、第２図に示すごと
く連結シャフト３上に、多分割スリーブ状のスクリュ片
１を嵌装した分割型構造であり、この場合機械構造上か
らスクリュ片のネジ谷部（通称：フライト谷部）との肉
厚の制約から薄肉、を余儀なくされ、そのことから靭性
不足を招き使用面が早期に欠損するという問題もあった
。Furthermore, due to the severity of the wear and the need to change the wiring conditions, screws for the above-mentioned applications generally have a multi-segmented sleeve-shaped screw piece 1 fitted onto the connecting shaft 3 as shown in Figures 1 and 2. It has a split type structure, and in this case, due to the machine structure, the thickness of the threaded part of the screw piece (commonly known as the flight valley) is limited, so it is forced to have a thin wall, which leads to a lack of toughness and the use surface is premature There was also the problem of loss.
このため最近では、靭性に優れた熱間ダイス鋼に自溶性
合金を溶射したものや、アルミ窒化鋼や構造用合金鋼に
硬質クロームメツキを施したものが使用されてきた。For this reason, recently, hot die steel with excellent toughness sprayed with a self-fluxing alloy, and aluminum nitride steel or structural alloy steel plated with hard chrome have been used.
しかし、例えばシリカなどの高充填付人リエボキシ樹脂
の混練押出においては前記冷間ダイス鋼に比し母材の欠
損という問題は解消されたものの、溶射品の場合局部摩
耗や欠けが発生し、またアルミ窒化鋼や構造用合金鋼に
硬質クロームメツキを施したものも、耐摩耗性の面では
、大巾な改善に至らず問題があった。However, in the case of kneading and extrusion of highly filled re-boxy resins such as silica, the problem of chipping of the base material has been solved compared to the cold die steel, but in the case of thermal sprayed products, local wear and chipping occur, and Hard chrome plating applied to aluminum nitride steel or structural alloy steel also had problems in terms of wear resistance, without significantly improving it.
上記の諸問題に鑑み、発明者等は特願平１−２９２８８
８号において、高Ｃ高Ｃｒ−Ｆｅ系の合成樹脂混練押出
機等用スクリュ、およびこれに金属窒化物、金属炭化物
または金属炭窒化物などの表面処理を施したものを提案
した。これらは従来品に比し長寿金品として使用されて
来たが、最近樹脂の高粘度化やシリカの充填量が、従来
品に比べ１０〜１５％増量添加されるに至り、より耐摩
耗性の優れたスクリュ材質が必要となってきた。In view of the above-mentioned problems, the inventors filed a patent application No. 1-29288.
In No. 8, we proposed a screw for a high C, high Cr-Fe synthetic resin kneading extruder, etc., and a screw surface-treated with metal nitride, metal carbide, or metal carbonitride. These have been used as long-lasting metal products compared to conventional products, but recently the viscosity of the resin has increased and the amount of silica has been increased by 10 to 15% compared to conventional products. There is a need for superior screw materials.
以上説明したように、従来のスクリュは耐摩耗性不足に
より、要求される高寿命、信頼性が得られないという問
題があった。As explained above, conventional screws have a problem in that required long life and reliability cannot be achieved due to insufficient wear resistance.
本発明は、耐摩耗性、靭性が優れた長寿命、高信頼性を
有する、合成樹脂混練押出機用のみならず、射出成形機
用も含めた、スクリュを提供することである。The object of the present invention is to provide a screw for use not only in synthetic resin kneading extruders but also in injection molding machines, which has excellent wear resistance and toughness, long life, and high reliability.
本発明は重量％でＣ２．０〜３．５％、Ｃｒ ３．０〜
１０．０、Ｗ １．０〜２０．０％、Ｍｏ １．０〜１
１．０％１、ただし、（１８≦Ｗ＋２Ｍｏ≦２４） 、
Ｖ ５．６〜１５．０、ｃｏ １５．０％以下、Ｓｉ
２．０％以下、Ｍｎ１．０％以下、残部Ｆｅおよび通常
の不純物よりなる基質にＴｉ、Ｖ、Ｎｂ、の窒化物、炭
化物、炭窒化物の１種または２種以上を均一に分散せし
めたことを特徴とする合成樹脂混練押出機等用スクリュ
、および上記スクリュの使用面に金属窒化物、金属炭化
物および金属炭窒化物から選ばれる一種以上の硬質物質
を被覆した合成樹脂混練押出機等用スクリュである。The present invention contains C 2.0 to 3.5% and Cr 3.0 to 3.5% by weight.
10.0, W 1.0-20.0%, Mo 1.0-1
1.0%1, however, (18≦W+2Mo≦24),
V 5.6-15.0, co 15.0% or less, Si
One or more types of nitrides, carbides, and carbonitrides of Ti, V, and Nb are uniformly dispersed in a substrate consisting of 2.0% or less, Mn 1.0% or less, the balance Fe, and normal impurities. A screw for a synthetic resin kneading extruder etc. characterized by It is a screw.
次に、本発明の母材材料の成分限定の理由をのべる。Next, the reasons for limiting the components of the base material of the present invention will be described.
Ｃは材料の硬さをＨＲＣ７０程度または、それ以上の高
硬度とし、かつ、Ｃｒ、Ｍｏ、■などの炭化物形成元素
との間に高硬度の炭化物を形成し、すぐれた耐摩耗性や
耐焼付性を付与するために添加される。多すぎると炭化
物量が過度に多くなり靭性の低下や、加工性の低下を招
くので３．５％以下とし、低すぎると上記添加の効果が
得られないので２．０％以上とする。C has a material hardness of about HRC 70 or higher, and forms a highly hard carbide with carbide-forming elements such as Cr, Mo, and ■, and has excellent wear resistance and seizure resistance. It is added to impart character. If it is too large, the amount of carbides increases excessively, leading to a decrease in toughness and workability, so the content should be 3.5% or less, and if it is too low, the effect of the above addition cannot be obtained, so the content should be 2.0% or more.
Ｃｒは、Ｃとの間に高硬度の炭化物を形成、また基地に
固溶して耐食性、耐酸化性を高めるために添加されるも
ので、高度の耐食・耐摩耗性を維持させるため高目に限
定される、多すぎると焼入温度を過度に高くし、また、
炭化物量が過度に多くなり靭性低下を招くので１０．０
％以下とし低すぎると上記添加の効果が得られないので
、３．０％以上とする。Cr is added to form a high hardness carbide with C, and to form a solid solution in the matrix to improve corrosion resistance and oxidation resistance. If it is too high, the quenching temperature will be too high, and
10.0 because the amount of carbide increases excessively and causes a decrease in toughness.
If the content is too low, the effect of the above addition cannot be obtained, so the content should be 3.0% or more.
Ｓｉは、本願発明材料の低温域での焼戻しにおける硬さ
を高めるために添加される。多すぎると靭性を低下させ
、また、熱伝導率を低下させるので２．０％以下とする
。Si is added to increase the hardness of the material of the present invention when tempered in a low temperature range. If it is too large, the toughness and thermal conductivity will be reduced, so the content should be 2.0% or less.
Ｍｎは、本願発明材料の焼入性を、とくに高めるために
添加される。多すぎると残留オーステナイトを安定化し
、熱処理硬さを低下させるので１．０％以下とする。Mn is added to particularly improve the hardenability of the material of the present invention. If it is too large, retained austenite will be stabilized and heat treatment hardness will be reduced, so the content should be 1.0% or less.
ＭＯおよびＷはＣとの間に硬質の炭化物を形成し耐摩耗
性を与え、さらに５００℃以上の焼戻しにおいて、基地
から特殊炭化物を析出させて二次硬化をあたえるために
添加される６多すぎると炭化物量を過度に増加させて靭
性低下を招くため、（１８≦Ｗ＋２Ｍｏ≦２４）とする
ことが望ましい。MO and W are added to form hard carbides with C to provide wear resistance, and to precipitate special carbides from the matrix during tempering at 500°C or higher to provide secondary hardening. Too much 6. It is desirable that (18≦W+2Mo≦24) be satisfied because this excessively increases the amount of carbides and causes a decrease in toughness.
■はＣとの間にきわめて高硬度の炭化物を形成し、耐摩
耗性を大きく向上させ、また焼戻時に特殊炭化物を析出
させて二次硬化を与えるために添加される。多すぎると
靭性を低下させるので１５．０％以下とし、低すぎると
上記添加の効果が得られないので５．６％以上とする。(2) is added to form extremely hard carbides with C, greatly improving wear resistance, and to precipitate special carbides during tempering to provide secondary hardening. If it is too large, the toughness will decrease, so the content should be 15.0% or less, and if it is too low, the effect of the above addition cannot be obtained, so the content should be 5.6% or more.
Ｃｏは、基地に固溶して耐食性を向上させ、また熱処理
硬さを高めるために添加される。多すぎると靭性低下を
招くので１５．０％以下とし、少なすぎると上記添加の
効果が得られないので０．５％以上とする。Co is added as a solid solution in the matrix to improve corrosion resistance and to increase heat treatment hardness. If it is too large, the toughness will deteriorate, so the content should be 15.0% or less, and if it is too small, the effect of the above addition cannot be obtained, so the content should be 0.5% or more.
さらに、上記基質にＴｉ、Ｖ、Ｎｂ、の窒化物、炭化物
および炭窒化物の１種または２種以上を２〜１２％の範
囲で均一に分散させしめさらに高硬度とすることで耐摩
耗性を向上させる。〔実施例〕実施例に基づいて本発明
の詳細な説明する。Furthermore, wear resistance is achieved by uniformly dispersing one or more types of nitrides, carbides, and carbonitrides of Ti, V, and Nb in the range of 2 to 12% in the above substrate to further increase hardness. improve. [Example] The present invention will be explained in detail based on an example.
第１表にテストに使用した各材料の化学成分を示す。第
２表にそれぞれの材料について使用状態に準じた熱処理
条件によるテストピースでの熱処理硬さ、および、靭性
強度（抗折強度）測定結果ならびに第１図に示すごとき
分割型混練押出機に組立て、８０ｗｔ％シリカ入りエポ
キシ樹脂に使用したときの寿命テスト結果を同条件の従
来の５ＫＤＩＩの寿命時間をｉｏｏとした指数で、被覆
処理を施したものは、その条件も併せて示す。Table 1 shows the chemical composition of each material used in the test. Table 2 shows the heat treatment hardness and toughness strength (flexural strength) measurement results of test pieces under heat treatment conditions according to the usage conditions for each material, as well as the results of assembling in a split type kneading extruder as shown in Figure 1. The life test results when used on 80wt% silica-containing epoxy resin are expressed as an index using the life time of conventional 5KDII under the same conditions as ioo, and the conditions for those subjected to coating treatment are also shown.
また、５ＫＤ６１に自溶性合金を溶射したスクリュの寿
命時間も同様に指数で比較材として記載した。第２表の
テスト結果から、本発明に用いられる材料は、いずれも
５ＫＤＩＩより高い硬さで、かつ、大幅に高い抗折強度
を有し、欠は発生の可能性が低いことがわかる。また、
被覆処理面は、母材が露出するまでの時間を延長する点
で有効であり、また、より高硬度のＴｉＮ被覆はＶＣ被
覆より優れていること、これらの被覆処理によっても、
欠けの発生は見られないことがわかる。ＣＤ３はＣＤＩ
、ＣＤ２、に対しＣＯを低減したものであるが、同硬さ
のＣＤＩとほぼ同等の寿命を得ている。ＣＤＩ、ＣＤ２
、およびＣＤ３は、それぞれ炭化物を増加および、減少
したものであるが、欠けを防止できる範囲内で炭化物を
増加することにより、寿命向上を達成可能であることを
示している。。合成樹脂混練押出機等において最も要求
度の高い耐摩耗性を第一に考えるならば、本願材質は、
いずれも格段に要求性能に優れていることがわかる。〔
発明の効果〕
以上述べたように、本発明の合成樹脂混練押出機等用ス
クリュは、従来品に比し、きわめて優れた耐摩耗性を備
え、これに対する寿命を格段に高めたもので、繁雑な部
品交換の手間を省き、成形製品の品質安定、および、成
形能率の向上に寄与し、工業上有効な発明である。In addition, the life time of a screw made of 5KD61 sprayed with a self-fluxing alloy is also listed as an index as a comparative material. From the test results in Table 2, it can be seen that all of the materials used in the present invention have a hardness higher than 5KDII, a significantly higher bending strength, and a low possibility of cracking. Also,
The coated surface is effective in extending the time until the base material is exposed, and the higher hardness of the TiN coating is superior to the VC coating.
It can be seen that no chipping is observed. CD3 is CDI
, CD2, but has a lifespan almost equivalent to that of CDI with the same hardness. CDI, CD2
, and CD3 have increased and decreased carbide content, respectively, and show that life can be improved by increasing carbide content within a range that prevents chipping. . Considering wear resistance, which is the highest requirement in synthetic resin kneading extruders, etc., the material of the present application is
It can be seen that both of them are significantly superior in the required performance. [
[Effects of the Invention] As described above, the screw for synthetic resin kneading extruders, etc. of the present invention has extremely superior abrasion resistance and has a significantly longer service life compared to conventional products. This is an industrially effective invention that saves the trouble of replacing parts, contributes to stable quality of molded products, and improves molding efficiency.
第１図は、本発明スクリュの外観図、第２図はスクリュ
およびスクリュ連結用シャフトなどの組立状態を示す断
面図の一例である。
１：スクリュ、２：スクリュヘッド、３：スクリュ連結
用シャフト、４ニジリンダ、５：多孔穴付ダイス、
２ ヌフワク へ、、）−”
１２ 図FIG. 1 is an external view of the screw of the present invention, and FIG. 2 is an example of a cross-sectional view showing an assembled state of the screw and the shaft for connecting the screw. 1: Screw, 2: Screw head, 3: Shaft for screw connection, 4 Niji cylinder, 5: Die with multi-hole, 2 Nufuwaku,,)-" 12 Figure
Claims (2)
．０％、Ｗ１．０〜２０．０％、Ｍｏ１．０〜１１．０
％、ただし（１８≦Ｗ＋２Ｍｏ≦２４）、Ｖ５．６〜１
５．０％、Ｃｏ１５．０％以下、Ｓｉ２．０％以下、Ｍ
ｎ１．０％以下、残部Ｆｅおよび通常の不純物よりなる
基質にＴｉ、Ｖ、Ｎｂ、の窒化物、炭化物、炭窒化物の
１種または２種以上を均一に分散せしめたことを特徴と
する合成樹脂混練押出機等用スクリュ。(1) C2.0-3.5%, Cr3.0-10 in weight%
．． 0%, W1.0~20.0%, Mo1.0~11.0
%, however (18≦W+2Mo≦24), V5.6~1
5.0%, Co15.0% or less, Si2.0% or less, M
Synthesis characterized in that one or more of nitrides, carbides, and carbonitrides of Ti, V, and Nb are uniformly dispersed in a substrate consisting of n1.0% or less, the balance being Fe and ordinary impurities. Screw for resin kneading extruder, etc.
化物から選ばれる一種以上の硬質物質を被覆した請求項
（１）記載の合成樹脂混練押出機等用スクリュ。(2) The screw for a synthetic resin kneading extruder or the like according to claim (1), wherein the use surface is coated with one or more hard substances selected from metal nitrides, metal carbides, and metal carbonitrides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2176599A JPH0466643A (en) | 1990-07-04 | 1990-07-04 | Screw for kneading and extruding machine for synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2176599A JPH0466643A (en) | 1990-07-04 | 1990-07-04 | Screw for kneading and extruding machine for synthetic resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0466643A true JPH0466643A (en) | 1992-03-03 |
Family
ID=16016390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2176599A Pending JPH0466643A (en) | 1990-07-04 | 1990-07-04 | Screw for kneading and extruding machine for synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0466643A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7454228B2 (en) | 2000-06-30 | 2008-11-18 | Sharp Kabushiki Kaisha | Display device and display system |
| KR100896195B1 (en) * | 2007-05-30 | 2009-05-12 | (주)세광쇼트기계인천공장 | An alloy composition for preparing a blade of shot blast machine |
| US7696953B2 (en) | 2001-02-15 | 2010-04-13 | Microsoft Corporation | Methods and systems for a portable, interactive display device for use with a computer |
-
1990
- 1990-07-04 JP JP2176599A patent/JPH0466643A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7454228B2 (en) | 2000-06-30 | 2008-11-18 | Sharp Kabushiki Kaisha | Display device and display system |
| US7519389B2 (en) | 2000-06-30 | 2009-04-14 | Sharp Kabushiki Kaisha | Display device and display system |
| US7696953B2 (en) | 2001-02-15 | 2010-04-13 | Microsoft Corporation | Methods and systems for a portable, interactive display device for use with a computer |
| KR100896195B1 (en) * | 2007-05-30 | 2009-05-12 | (주)세광쇼트기계인천공장 | An alloy composition for preparing a blade of shot blast machine |
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