JPH02125711A - Injection molding method - Google Patents
Injection molding methodInfo
- Publication number
- JPH02125711A JPH02125711A JP23948289A JP23948289A JPH02125711A JP H02125711 A JPH02125711 A JP H02125711A JP 23948289 A JP23948289 A JP 23948289A JP 23948289 A JP23948289 A JP 23948289A JP H02125711 A JPH02125711 A JP H02125711A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- mold
- filling
- resin
- time
- 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
Links
- 238000001746 injection moulding Methods 0.000 title claims description 10
- 239000011347 resin Substances 0.000 claims abstract description 78
- 229920005989 resin Polymers 0.000 claims abstract description 78
- 238000000465 moulding Methods 0.000 abstract description 25
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000005429 filling process Methods 0.000 abstract description 2
- 230000000717 retained effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 206010011878 Deafness Diseases 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、射出成形方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an injection molding method.
〔従来の技術〕・
第６図に従来の射出成形方法における射出時の成形機の
ラム圧および金型内の溶融樹脂圧（以下、型内樹脂圧と
いう）の変化を示す。この図に示すように、成形機のラ
ム圧は、溶融樹脂を充填する時（充填時）には高く、保
圧時にはこれより低いが、従来の成形方法においては、
型内樹脂圧が充填時にはラム圧にほぼ追随して上昇し、
保圧時には、充填された溶融状部の樹脂が次第に冷却固
化する際に収縮することに伴い、充填時型内樹脂圧より
圧力が次第に低下していく、という圧力変化のパターン
をとるものであった。このような圧力変化は、例えば油
圧により生じるラム圧、金型内のキャビティの容積、成
形機のノズルからキャビティへ到る通路における溶融樹
脂の流れの抵抗、キャビティに臨むゲートの径等種々の
要因に帰因すると思われる。[Prior Art] Fig. 6 shows changes in the ram pressure of the molding machine and the molten resin pressure in the mold (hereinafter referred to as in-mold resin pressure) during injection in a conventional injection molding method. As shown in this figure, the ram pressure of the molding machine is high when filling with molten resin (filling) and lower when holding pressure, but in the conventional molding method,
During filling, the resin pressure inside the mold increases almost following the ram pressure,
During pressure holding, the pressure changes in a pattern in which the resin in the filled molten part contracts as it gradually cools and solidifies, and the pressure gradually decreases from the resin pressure in the mold at the time of filling. Ta. Such pressure changes are caused by various factors such as the ram pressure generated by hydraulic pressure, the volume of the cavity in the mold, the resistance to the flow of molten resin in the path from the nozzle of the molding machine to the cavity, and the diameter of the gate facing the cavity. This seems to be due to.
ところで、固定された型締め能力（型締め力）を持つ成
形機で成形できる成形品の投影面積は、投影面積Ｘ型内
樹脂圧＝型締め力
で決まる大きさが上限であり、投影面積ｘ型内樹脂圧が
成形機の型締め能力を越えると、雄型と雌型との間の分
割面が開き （開き量ｈ）、結果として、第５図に示す
如く、雄型ｌと雌型２との分割面１ａ、２ａに生じた隙
間３に溶融樹脂Ｍが入り込み、成形品にバリＭａが生じ
る。こととなり、製品不良となり、時には成形が中断さ
れる。一方、成形品の充填密度を所期の大きさ以上にす
るためには、型内樹脂圧を一定の値以上にする必要があ
るので、結局、成形可能な成形品の投影面積は、成形機
の型締め力により制限される。By the way, the projected area of a molded product that can be molded by a molding machine with a fixed mold clamping capacity (mold clamping force) is determined by the following: projected area x resin pressure in the mold = mold clamping force, and the projected area x When the resin pressure inside the mold exceeds the mold clamping capacity of the molding machine, the dividing surface between the male mold and the female mold opens (opening amount h), and as a result, as shown in Figure 5, the male mold l and the female mold The molten resin M enters the gap 3 formed between the dividing surfaces 1a and 2a between the molded product and the molded product, and burrs Ma are generated in the molded product. This results in product defects, and sometimes molding is interrupted. On the other hand, in order to increase the packing density of the molded product to the desired size or higher, the resin pressure inside the mold must be increased to a certain value or higher, so in the end, the projected area of the molded product that can be molded is is limited by the mold clamping force.
本発明は上記事情に鑑み、固定された型締め能力を持つ
射出成形機において、パリを発生させることはなく、従
来の上限以上の大きさの投影面積の成形を可能にするこ
とを目的とする。In view of the above circumstances, it is an object of the present invention to make it possible to mold a projected area larger than the conventional upper limit without causing flashing in an injection molding machine having a fixed mold clamping capacity. .
（課題を解決するための手段〕
本発明は、上記問題点を解決するために、キャビティへ
の溶融樹脂充填時に、充填後の保圧時に必要な最大型内
樹脂圧より低い範囲内で型内樹脂圧を漸次増大させて溶
融樹脂の充填を行った後、さらに型内樹脂圧を増大させ
て保圧を行うこととした。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides that when filling a cavity with molten resin, the pressure inside the mold is lower than the maximum resin pressure in the mold required for holding pressure after filling. After filling the mold with molten resin by gradually increasing the resin pressure, we decided to further increase the resin pressure in the mold to perform holding pressure.
充填時の型内樹脂圧が低くかつ当該型内樹脂圧を漸次増
大させているので、溶融樹脂のキャビティ内での移動速
度（つまり充填速度）が遅くなり、したがって、溶融樹
脂のキャビティ奥部に達する時間が長くなり、したがっ
て、その間に金型に接する薄い層がよ、く冷却固化され
てスキン硬化層となる。このスキン硬化層の内部は溶融
状態であり、保持圧力がその内部溶融層を伝わって全体
に作用する。したがって、この状態からさらに型内樹脂
圧を増大させることにより成形機の型締め能力を越える
投影面積Ｘ型内樹脂圧が加わって、金型の分割面が開い
ても、スキン硬化層の存在のため、その隙間に溶融樹脂
が入り込むことはなく、したがって成形品にパリは生じ
ない。次いで、内部溶融層も冷却固化される。Since the resin pressure in the mold during filling is low and the resin pressure in the mold is gradually increased, the moving speed of the molten resin within the cavity (in other words, the filling speed) is slowed down, so that the molten resin does not reach the deep part of the cavity. It takes a longer time to arrive, and therefore, during that time the thin layer in contact with the mold is better cooled and solidified to become a hardened skin layer. The interior of this hardened skin layer is in a molten state, and the holding pressure is transmitted through the internal molten layer and acts on the entire surface. Therefore, if the resin pressure in the mold is further increased from this state, the projected area Therefore, the molten resin does not enter the gap, and therefore no cracks occur in the molded product. Then, the internal molten layer is also cooled and solidified.
第１図〜第４図に従って本発明の一実施例を説明する。 An embodiment of the present invention will be described with reference to FIGS. 1 to 4.
第２図は、金型Ａ１および成形機Ｂの断面図である。FIG. 2 is a sectional view of the mold A1 and the molding machine B.
金型Ａの詳細を説明すると、ｌは雄型、２は雌型、４は
固定側取付は板、５は固定側スペーサ、６は可動側スペ
ーサ、７は可動側取付は板、８は突出板（上）、９は突
出板（下）、１０はロケートリング、１１はマニホール
ド、１２はトーピード、１３はランナーブツシュ、１４
は突出ピン、１５はランナーである。また、Ｉ６は雄型
！と雌型２との間に形成されるキャビティ、つまり成形
品部分であり、実施例では、第５図で示した特性を示す
従来の金型でのキャビティの数の２倍を有しており （
つまり、投影面積が２倍である）、成形機Ｂからの溶融
樹脂は各キャビティに共通に射出される。そして、キャ
ビティ！６に臨むゲートＩ７の径は、従来の金型におけ
るゲートの径より大きく、例えば１．６倍の径としてい
る。なお、実施例の成形品は浅いコツプ状である。To explain the details of mold A, l is a male type, 2 is a female type, 4 is a plate for fixed side mounting, 5 is a fixed side spacer, 6 is a movable side spacer, 7 is a plate for movable side mounting, and 8 is a protrusion. Plate (top), 9 is a protruding plate (bottom), 10 is a locate ring, 11 is a manifold, 12 is a torpedo, 13 is a runner bush, 14
1 is a protruding pin, and 15 is a runner. Also, I6 is a male type! The cavity formed between the mold 2 and the female mold 2, that is, the molded product part, has twice the number of cavities in a conventional mold exhibiting the characteristics shown in FIG. (
In other words, the projected area is twice as large), and the molten resin from molding machine B is commonly injected into each cavity. And the cavity! The diameter of the gate I7 facing 6 is larger than the diameter of the gate in a conventional mold, for example, 1.6 times the diameter. Note that the molded product of the example has a shallow cup shape.
成形機Ｂにつ（２で説明すると、油圧シリンダ！８によ
り往復駆動されるラム１９がヒータ２０で加熱される加
熱筒２１内に摺動自在に収容され、加熱筒２１の後方上
部にホッパ２２を備え、先端にノズル２３を備えた構造
である。Regarding the molding machine B (explaining in 2), a ram 19 reciprocally driven by a hydraulic cylinder!8 is slidably housed in a heating cylinder 21 heated by a heater 20, and a hopper 22 is installed at the rear upper part of the heating cylinder 21. It has a structure with a nozzle 23 at the tip.
上記の金型Ａ１成形機Ｂで射出成形を行うが、この場合
、ラム圧、すなわちラム１９が加熱筒２１内の溶融樹脂
に作用する圧力を従来の金型におけるラム圧と同じとす
る （従って油圧シリンダ１８の油圧が従来、と同じ）
と、第１図に示す如き圧力変化のパターンで射出成形が
行われる。すなわち、型内樹脂圧は、充填時には充分低
い圧力が漸次増大し、保圧時には充填時の圧力より高い
型内樹脂圧が保持される。この保圧時の型内樹脂圧は、
成形品の充填密度を上げるために必要な圧力以上にする
。Injection molding is performed using the mold A1 molding machine B described above, but in this case, the ram pressure, that is, the pressure that the ram 19 acts on the molten resin in the heating cylinder 21, is the same as the ram pressure in the conventional mold (therefore, The oil pressure of the hydraulic cylinder 18 is the same as before)
Then, injection molding is performed with a pressure change pattern as shown in FIG. That is, the resin pressure in the mold is a sufficiently low pressure during filling and gradually increases, and during pressure holding, the resin pressure in the mold is maintained at a higher pressure than the pressure during filling. The resin pressure inside the mold during this holding pressure is
Apply more pressure than necessary to increase the packing density of the molded product.
このような圧力変化のパターンにより成形が１行われる
と、第３図に示す充填過程を経てキャビティの末端にま
で達するが、作用の項で述べた如く、充填時の型内樹脂
圧が低くかつ当該樹脂圧が漸次増大することにより、溶
融樹脂Ｍの充填速度が遅くなり、第４図に示す如く雄型
１、雌型２に接する薄い層がよく冷却固化されてスキン
硬化層Ｍｌとなる。このスキン硬化１１Ｍ、の内部は溶
融状態であり、保持圧力がその内部溶融層Ｍ、を伝って
全体に作用する。このように、スキン硬化層Ｍ。When molding is performed once with such a pattern of pressure changes, it reaches the end of the cavity through the filling process shown in Figure 3, but as mentioned in the section of the operation, the resin pressure inside the mold is low during filling and the end of the cavity is reached. As the resin pressure gradually increases, the filling speed of the molten resin M slows down, and as shown in FIG. 4, the thin layer in contact with the male mold 1 and the female mold 2 is well cooled and solidified to form a hardened skin layer Ml. The inside of this hardened skin 11M is in a molten state, and the holding pressure acts on the entire surface through the internal molten layer M. In this way, the skin hardening layer M.
ができるため、そのまま型内樹脂圧を増大させて保圧時
に金型の分割面１ａ 、２ａが開いても、その隙間３に
溶融樹脂が入り込むことはなく、したがって成形品にパ
リは生じない。また、低い型内樹脂圧で漸次キャビティ
全体に樹脂を充填させるため、内部応力発生の少ない成
形品を得ることができる。Therefore, even if the resin pressure in the mold is increased and the dividing surfaces 1a and 2a of the mold are opened during pressure holding, the molten resin will not enter the gap 3, and therefore no cracks will occur in the molded product. Furthermore, since the entire cavity is gradually filled with resin at a low resin pressure within the mold, a molded product with less internal stress can be obtained.
なお、実施例は、従来の成形方法に比し、成形品の個数
を２倍とし、ゲート径を約１．６倍としたが、第１図に
示す如く充填時の型内樹脂圧を保圧時の圧力より低くし
て成形するものであればよい。したがって、多数個取り
でより多い多数個取りとするものに限らず、成形しよう
とする成形品自体の投影面積を大きくする場合でもよい
。さらに、成形品の投影面積自体は従来と変えずに、ラ
ムの送り速度を遅くすることによってもよい。In addition, compared to the conventional molding method, in this example, the number of molded products was doubled and the gate diameter was approximately 1.6 times, but as shown in Fig. 1, the resin pressure inside the mold was maintained during filling. Any molding may be performed as long as it is molded at a pressure lower than the pressure used for pressing. Therefore, the molded product to be molded may have a larger projected area rather than being limited to molding a larger number of molded parts. Furthermore, the projected area of the molded product itself may be unchanged from the conventional one by slowing down the feed speed of the ram.
以上説明したように本発明によれば、充填時の型内樹脂
圧を保圧時の型内樹脂圧より低い範囲内で型内樹脂圧を
漸次増大させて溶融樹脂の充填を行った後、さらに型内
樹脂圧を増大させて保圧を々
シ
行うので、溶融樹脂の充填速度が遅くなって、金型に接
する薄い層がスキン硬化層となり、したがって、成形機
の型締め能力を越える力により金型が開いても、成形品
にパリは発生しない。したがって、従来の成形方法と比
し、操作の複雑化を招くことなく同じ型締め能力の成形
機を用いても、より大きな投影面積の成形が可能となる
。また、スキン硬化層ができるので、金型の寸法精度が
多少悪くて分割面にもと６と隙間がある場合でも、パリ
が生じない。As explained above, according to the present invention, after filling with molten resin by gradually increasing the resin pressure in the mold within a range where the resin pressure in the mold during filling is lower than the resin pressure in the mold during holding pressure, Furthermore, since the resin pressure in the mold is increased to maintain pressure, the filling speed of the molten resin is slowed down, and the thin layer in contact with the mold becomes a hardened skin layer, resulting in a force that exceeds the mold clamping capacity of the molding machine. Even if the mold is opened, no cracks will occur in the molded product. Therefore, compared to conventional molding methods, it is possible to mold a larger projected area without complicating operations and using a molding machine with the same mold clamping capacity. Further, since a hardened skin layer is formed, even if the dimensional accuracy of the mold is somewhat poor and there is a gap between the split surface and the original 6, no breakage occurs.
第１図〜第４図は本発明の一実施例を示すもので、第１
図はラム圧および型内樹脂圧についての圧力−時間グラ
フ、第２図は金型および射出成形機の断面図、第３図は
キャビティ部分要部（第２図の（イ）部）の充填過程に
おける状態の拡大図、第４図は同充填直後における状態
の拡大図、第５〜６図は従来の射出成形方法を示すもの
で、第５図は圧力−時間グラフ、第６図はキャビティ部
分要部の充填直後の状聾図である。
九１図
手
続
中言〕
正
書
平成１
年１２％ｓ日
ｌ。
事件の表示
平成１年特許願第２３９４８２号
２゜
発明の名称
４゜
代
理
人
東京都中央区八重洲２丁目１番５号
東京駅前ビル６階
明細書の「特許請求の範囲」および「発明の詳細な説明
」の各欄。
６、補正の内容
方間ｎ
（１）明細書の「特許請求の範囲」を、別紙の通り訂正
する。
（２）明細書第３頁第１４行目〜第１５行目に「漸次増
大させて、・・・・・・を増大させて保圧を」とあるの
を、「漸次増大させて、雄型および雌型に接する部分に
溶融樹脂が冷却固化されたスキン硬化層を形成させつつ
溶融樹脂の充填を行った後、これからさらに型内樹脂圧
を増大させて成形機の型締め能力（＝投影面積Ｘ型内樹
脂圧）を超える圧力で保圧を」に訂正する。
（３）同、第６頁第８行目に「必要な圧力以上」とある
のを、「必要な圧力以上であって、しかも成形機の型締
め能力を超える圧力」に訂正する。
（４）同、第６頁第１２行目〜第！７行目に「の末端に
まで達する・・・・・・スキン硬化層Ｍ、となる。」と
あるのを、「の末端まで達する。この時、充填時の型内
樹脂圧を低くかつ当該樹脂圧を漸次増大させて、溶融樹
脂Ｍの充填速度を遅くさせることにより、第４図に示す
ように、雄型１、雌型２に接する薄い層をよく冷却固化
させてスキン硬化層Ｍ、を形成させる。」に訂正する。
（５）同、第６頁末行に「ができるため、その」とある
のを、「を形成させているため、その」に訂正する。
（６）同、第７頁第１行目に「保圧時に金型」とあるの
を、「成形機の型締め能力を超える圧力で保圧を行う際
に金型」に訂正する。
（７）同、第７頁第９行目〜第１θ行目に［充填時の型
内樹脂圧・・・・・成彩するものであれば」とあるのを
、［充填時に、充填後の保圧時に必要な最大型内樹脂圧
より低い範囲内で型内樹脂圧を漸次増大さＵ゛て、雄型
および雌型に接する部分に溶融樹脂が冷却固化されたス
キン硬化層を形成さけつつ成形するものであれば」に訂
正する。
（８）同、第７頁下から４行目〜末行に［充填時の・・
・・・増大させて保圧を」とあるのを、「充填時に、充
填後の保圧時の型内樹脂圧より低い範囲内で型内樹脂圧
を漸次増大させて、雄型および雌型に接する部分に溶融
樹脂が冷却固化されたスキン硬化層を形成させつつ溶融
樹脂の充填を行った後、これからさらに型内樹脂圧を増
大させて成形機の型締め能力（−投影面積×型内樹脂圧
）を超える圧力で保圧を」に訂正する。
一以上一
特許請求の範囲
キャビティへの溶融樹脂充填時に、充填後の保圧時に必
要な最大型内樹脂圧より低い範囲内で型層を形成させつ
つ溶融樹脂の充填を行った後、これからさらに型内樹脂
圧を増大させて成形機の型締め能力（＝投影面積Ｘ型内
樹脂圧）を超える圧友１上記保圧を行うことを特徴とす
る射出成形方法。Figures 1 to 4 show one embodiment of the present invention.
The figure is a pressure-time graph for ram pressure and resin pressure in the mold, Figure 2 is a cross-sectional view of the mold and injection molding machine, and Figure 3 is the filling of the main part of the cavity (part (A) in Figure 2). Figure 4 is an enlarged view of the state immediately after filling, Figures 5 and 6 show the conventional injection molding method, Figure 5 is a pressure-time graph, and Figure 6 is the cavity. FIG. 2 is a diagram of a deaf person's condition immediately after filling the main part. Figure 91 Procedural Middle Language] Orthographic Book 1999 12%s day l. Display of the case 1999 Patent Application No. 239482 2゜Name of the invention 4゜Representative 6th floor, Tokyo Station Building, 2-1-5 Yaesu, Chuo-ku, Tokyo "Claims" and "Details of the invention" each column of ``Explanation''. 6. Contents of the amendment n (1) The "Claims" of the specification will be corrected as shown in the attached sheet. (2) On page 3, lines 14 and 15 of the specification, the phrase “gradually increases the holding pressure by increasing...” was replaced with “gradually increases the After filling the molten resin while forming a hardened skin layer where the molten resin is cooled and solidified in the areas in contact with the mold and the female mold, the resin pressure inside the mold is further increased to increase the mold clamping capacity (= projection) of the molding machine. Correct the holding pressure at a pressure exceeding (area x mold internal resin pressure). (3) In the same article, page 6, line 8, the phrase ``more than the necessary pressure'' is corrected to ``the pressure more than the necessary pressure, which also exceeds the mold clamping capacity of the molding machine.'' (4) Same, page 6, line 12 - ! In the 7th line, the phrase "reaches the end of . . . becomes the skin hardened layer M." is replaced with "reaches the end of . At this time, the resin pressure in the mold during filling is kept low and By gradually increasing the resin pressure and slowing down the filling speed of the molten resin M, the thin layer in contact with the male mold 1 and the female mold 2 is well cooled and solidified to form a skin hardened layer M ” is corrected to “form.” (5) In the last line of page 6 of the same, the phrase ``to be formed, so'' should be corrected to ``to be formed, so to be.'' (6) In the first line of page 7, the phrase ``the mold when holding pressure'' is corrected to ``the mold when holding pressure is performed at a pressure that exceeds the mold clamping capacity of the molding machine.'' (7) In the same article, page 7, line 9 to line 1θ, the phrase [In-mold resin pressure at the time of filling...if it is a coloring material] was changed to [at the time of filling, after filling]. The resin pressure in the mold is gradually increased within a range lower than the maximum resin pressure in the mold required during pressure holding, to avoid forming a skin hardening layer in which the molten resin is cooled and solidified in the areas in contact with the male and female molds. "If it is something that is to be molded while (8) Same, page 7, 4th line from the bottom to the last line [when filling...
``Increase the holding pressure'' is changed from ``During filling, gradually increase the resin pressure in the mold within a range lower than the resin pressure in the mold during holding pressure after filling, and increase the pressure in the male and female molds.'' After filling the molten resin while forming a hardened skin layer where the molten resin is cooled and solidified in the area in contact with the mold, the resin pressure inside the mold is further increased to increase the mold clamping capacity of the molding machine (-projected area x inside the mold). Correct the holding pressure at a pressure exceeding the resin pressure). Scope of one or more claims When filling the cavity with molten resin, after filling the molten resin while forming a mold layer within a range lower than the maximum resin pressure in the mold required for holding pressure after filling, An injection molding method characterized by increasing the resin pressure in the mold to exceed the mold clamping capacity of the molding machine (=projected area x resin pressure in the mold) and performing the above-mentioned holding pressure.
Claims (1)
要な最大型内樹脂圧より低い範囲内で型内樹脂圧を漸次
増大させて溶融樹脂の充填を行った後、これからさらに
型内樹脂圧を増大させて上記保圧を行うことを特徴とす
る射出成形方法。When filling the cavity with molten resin, the resin pressure in the mold is gradually increased within a range lower than the maximum resin pressure in the mold required for holding pressure after filling, and then the resin pressure in the mold is further increased. An injection molding method characterized in that the above-mentioned holding pressure is performed by increasing the pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23948289A JPH02125711A (en) | 1989-09-14 | 1989-09-14 | Injection molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23948289A JPH02125711A (en) | 1989-09-14 | 1989-09-14 | Injection molding method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59170705A Division JPH0684031B2 (en) | 1984-08-16 | 1984-08-16 | Injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02125711A true JPH02125711A (en) | 1990-05-14 |
| JPH0451326B2 JPH0451326B2 (en) | 1992-08-18 |
Family
ID=17045433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23948289A Granted JPH02125711A (en) | 1989-09-14 | 1989-09-14 | Injection molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02125711A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5849183A (en) * | 1996-08-30 | 1998-12-15 | Kabushiki Kaisha Syst | Filtration apparatus |
| US5992642A (en) * | 1996-05-17 | 1999-11-30 | Kabushiki Kaisha Syst | Filtering apparatus and filtering system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390371A (en) * | 1977-01-20 | 1978-08-09 | Toshiba Machine Co Ltd | Injection and compression molding process |
-
1989
- 1989-09-14 JP JP23948289A patent/JPH02125711A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390371A (en) * | 1977-01-20 | 1978-08-09 | Toshiba Machine Co Ltd | Injection and compression molding process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5992642A (en) * | 1996-05-17 | 1999-11-30 | Kabushiki Kaisha Syst | Filtering apparatus and filtering system |
| US5849183A (en) * | 1996-08-30 | 1998-12-15 | Kabushiki Kaisha Syst | Filtration apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0451326B2 (en) | 1992-08-18 |
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| Date | Code | Title | Description |
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| EXPY | Cancellation because of completion of term |