JPS62109618A - Injection molding process for disc - Google Patents
Injection molding process for discInfo
- Publication number
- JPS62109618A JPS62109618A JP25051885A JP25051885A JPS62109618A JP S62109618 A JPS62109618 A JP S62109618A JP 25051885 A JP25051885 A JP 25051885A JP 25051885 A JP25051885 A JP 25051885A JP S62109618 A JPS62109618 A JP S62109618A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- clamping pressure
- resin material
- molten resin
- disc
- 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
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
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- 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）
本発明はディスク、具体的にはビデオディスク等の光学
ディスクを射出成形する射出成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection molding method for injection molding a disc, specifically an optical disc such as a video disc.
本発明は、溶融″された樹脂材を固定金型と可動金型と
の間に形成されるキャビティ内に射出してディスクを成
形する成形方法において、上記樹脂の射出工程中又は射
出工程完了後、固定金型に対する可動金型の型締め圧力
を所定の時間内で連続して変化させることにより、成形
されるディスクの光学特性、複屈折を改善するようにし
たものである。The present invention provides a molding method in which a disk is formed by injecting a molten resin material into a cavity formed between a fixed mold and a movable mold, during or after the resin injection step. The optical characteristics and birefringence of the molded disk are improved by continuously changing the clamping pressure of the movable mold relative to the fixed mold within a predetermined period of time.
（従来の技術）
従来、ビデオディスク等の光学ディスクを射出成形する
方法としては例えば特公昭６０−１８５２７号公報に開
示されるものかあ１゜
この公知例は固定金型と可動金型の間に型締め状態で形
成されるキャビティ内に環状スタンパ−がスタンパ−リ
ング締付部材により配列されてキャビティ内に射出され
る溶融樹脂材の熱作用によ４て半径方向に膨′―できる
ようになされ、キャビティ内に溶融−脂材を射出するこ
とによりスタンパ−の信号（ピット）を転写したビデオ
ディスクを成形するものである。(Prior Art) Conventionally, as a method for injection molding optical discs such as video discs, there is a method disclosed in Japanese Patent Publication No. 60-18527. An annular stamper is arranged in a cavity formed in a mold clamping state by a stamper ring clamping member so that it can expand in the radial direction by the thermal action of the molten resin material injected into the cavity. By injecting a molten resin material into a cavity, a video disc having stamper signals (pits) transferred thereon is molded.
このように、ビデオディスク等の光学ディスクを射出成
形する上で、スタンバ−の信号の転写性が良いこと（ス
タンバ−の中心側から最外周に至る全域において信号が
均一に転）′されること。）射出成形されたディスクの
複屈折（この場合はディスクの信号読取り用の入射光と
反射光との位相のずれ具合を言い、主としてディスクの
内部歪が原因する。）が極力小さいこと等が重要である
。In this way, when injection molding optical discs such as video discs, it is important that the signal transferability of the stand bar is good (the signal is uniformly transferred over the entire area from the center of the stand bar to the outermost circumference). . ) It is important that the birefringence of the injection-molded disk (in this case, it refers to the degree of phase shift between the incident light and the reflected light for reading the signal of the disk, and is mainly caused by the internal distortion of the disk) is as small as possible. It is.
なお複屈折が大きいと、ディスクの信号をディテクター
で読取ることが出来なくなり、特に、ドローディスクの
如く信号の書込み及び読取りの両方を行う光学ディスク
では、先に書込んだ信号をあとで読取ることが出来なく
なるので非常に重大である。Note that if the birefringence is large, the signal on the disc cannot be read by a detector, and especially in optical discs such as draw discs where signals are both written and read, it is difficult to read the signals written first. This is very important because it will not be possible.
本発明はかかる点に鑑み、キャビティ内への溶融樹脂材
の射出工程に対する可動金型への型締め圧力を連続的に
用度制御するだけで複屈折の小さなディスクを得る射出
成形方法を提供しようとするものである。In view of the above, the present invention provides an injection molding method for obtaining a disk with small birefringence by simply controlling the clamping pressure applied to a movable mold continuously during the injection process of molten resin material into a cavity. That is.
上記の問題を解決するために本発明は、溶融された樹脂
材を固定金型と可動金型との間に形成されるキャビティ
内に射出してディスクを成形する成形方法において、溶
融樹脂材の射出工程中又は射出工程完了後、固定金型に
対する可動金型の型締め圧力を所定の時間内で連続して
変化させることによりディスクを成形するものである。In order to solve the above problems, the present invention provides a molding method in which a disk is formed by injecting a molten resin material into a cavity formed between a fixed mold and a movable mold. During the injection process or after the injection process is completed, the disk is molded by continuously changing the clamping pressure of the movable mold against the fixed mold within a predetermined period of time.
（作用〕
このように、ディスクの射出成形において樹脂材の射出
工程中又はその完了後可動金型の型締め圧力を連続して
変化させることにより、キャビティ内の溶融樹脂の高分
子配合及び残留応力をキャビティ内の内外周の全域にお
いて一様にすることが出来て内部歪を極力少なくし、成
形されるディスクの光学特性、複屈折を改善することが
できる。(Function) In this way, by continuously changing the clamping pressure of the movable mold during or after the injection process of the resin material in the injection molding of the disk, the polymer composition of the molten resin in the cavity and the residual stress can be improved. can be made uniform over the entire inner and outer periphery of the cavity, thereby minimizing internal distortion and improving the optical properties and birefringence of the molded disk.
（実施例〕
以下、本発明を光学式ディスクの射出成形機に適用した
実施例を図面に基づき説明する。(Example) Hereinafter, an example in which the present invention is applied to an injection molding machine for optical discs will be described based on the drawings.
先ず、第１図〜第４図によっ′ζ金型構造を説明する。First, the structure of the 'ζ mold will be explained with reference to FIGS. 1 to 4.
可動金型＋１１にはスタンバ−（２）が内外周スタンバ
−押え（３１，（４１によって固定されている。固定金
型（６）は固定盤（７）に固定されており、中央に射出
ノズル（８）に連結され先端に開口部（９ａ）を有する
湯口筒体（９）が設けられている。そして固定金型（６
）の外周には固定盤（７）に固定された金型押え（１０
）が設けられている。A stub bar (2) is fixed to the movable mold +11 by means of stub bar holders (31, (41) on the inner and outer peripheries.The fixed mold (6) is fixed to a fixed platen (7), and an injection nozzle is mounted in the center. A sprue cylinder (9) is connected to the fixed mold (8) and has an opening (9a) at its tip.
) is equipped with a mold presser (10) fixed to the fixed platen (7).
) is provided.
次に、以−ヒの如き金型構造を用い、例えばポリカーボ
ネート樹脂によって成形するディスクの成形動作を説明
する。Next, the operation of molding a disk made of polycarbonate resin, for example, using the mold structure described below will be explained.
先ず、第１図は可動金型（１）が固定金型（６）から矢
印ａ方向に離間された型開き状態を示している。First, FIG. 1 shows an open state in which the movable mold (1) is separated from the fixed mold (6) in the direction of arrow a.
次に、この型開き状態から可動金型１１）が第１図で矢
印す方向に前進されて、やがて第２図に不ず如く可動金
型（１１の先端の外周部分（１ａ）が固定金型（６）の
金型押え（１０）の先端（１０ａ）に当接されて型閉じ
状態となる。そしてこの型閉じにより固定金型（６）の
前面外周部に外周スタンバ−押え（４）の先ｆｉ（４ａ
）が挿入されて、両金型（１１、（６１の間にキャビテ
ィ （１１）が形成される。 ６なお、この型閉じ状
態で、可動金型（１１に加えられる型締め圧（可動金型
（１１を固定金型（６）へ押圧する力）はＯｋｉ ／
ｏＡ付近となるように構成されている。Next, from this mold open state, the movable mold 11) is moved forward in the direction of the arrow in FIG. The mold (6) comes into contact with the tip (10a) of the mold holder (10), and the mold is closed.As a result of this mold closing, the outer periphery stand bar holder (4) is attached to the front outer periphery of the fixed mold (6). Ahead of fi (4a
) is inserted, and a cavity (11) is formed between the two molds (11, (61). 6. In this mold closed state, the clamping pressure applied to the movable mold (11) (The force for pressing 11 onto the fixed mold (6)) is Oki /
It is configured to be near oA.
次に、第３図に示す如くポリカーボネート樹脂の溶融樹
脂材（１２）が射出ノズル（８）を介して湯口筒体（９
）からキャビティ （１１）内に射出される。Next, as shown in FIG.
) into the cavity (11).
なおこの際、型閉じ状態で可動金型１１）の型締め圧が
Ｏｋｇ／ｄ付近となっていることから、上記キャビティ
（１１）内への溶融樹脂材（１２）の射出時に、その
射出圧によっ゛ζ可動金型＋１＋が第３図矢印ａ方向に
Δβたけ後退されて、両金型ｆｉｌ、 ＋６１間の隙間
が第２図のＴ１から第３図のＴ２に押し開かれる。At this time, since the mold clamping pressure of the movable mold 11) is around Okg/d in the mold closed state, when the molten resin material (12) is injected into the cavity (11), the injection pressure As a result, the movable mold +1+ is moved back by Δβ in the direction of the arrow a in FIG. 3, and the gap between the two molds fil, +61 is pushed open from T1 in FIG. 2 to T2 in FIG. 3.
従って、溶融樹脂材（１２）の射出時にはキャビティ（
１１）内が大気圧に近くなり、溶融樹脂材（１２）を無
負荷に近い状態でキャビティ（１１）内に射出すること
が出来る。Therefore, when injecting the molten resin material (12), the cavity (
11) The inside becomes close to atmospheric pressure, and the molten resin material (12) can be injected into the cavity (11) under almost no load.
この結果、射出された溶融樹脂材（１２）のキャビティ
（１１）内での流動性が非常に良くて、溶融樹脂（１
２）に不要な応力を与えることが全くない。As a result, the fluidity of the injected molten resin material (12) within the cavity (11) is very good, and the molten resin material (12) has very good fluidity within the cavity (11).
2) No unnecessary stress is applied at all.
次に、第４図に示す如く上記の如きキャビティ（１１）
内への溶融樹脂材（１２）の射出工程中又はその射出工
程の完了−に、可動金型（ｌ＋が矢印す方向に高圧で加
圧される。この可動金型（１〉の加圧力即ち型締め圧力
は後述するように所要時間内において連続して変化させ
る。なおこの時の可動金型（１１の矢印す方向への前進
量は前述したΔｌである。Next, as shown in FIG. 4, the cavity (11) as described above is formed.
During the process of injecting the molten resin material (12) into the interior of the molten resin material (12) or upon completion of the injection process, the movable mold (l+) is pressurized with high pressure in the direction of the arrow. The mold clamping pressure is continuously changed within the required time as described later.The amount of advance of the movable mold (11) in the direction indicated by the arrow at this time is the aforementioned Δl.
以上の結果、キャビティ（１１）内の溶融樹脂材（１２
）が所望の板厚のディスク（１３）にプレス成形されて
、スタンパ−（２）の信号（ピット）がそのディスク（
１３）に転写される。そして上記プレス成形後は、溶融
樹脂材（１２）の射出厚がそのま一保持されると共に両
金型（ｔｌ、（６１が冷却されることになる。As a result of the above, the molten resin material (12
) is press-molded into a disk (13) of desired thickness, and the signals (pits) of the stamper (2) are applied to the disk (13).
13). After the above-mentioned press molding, the injection thickness of the molten resin material (12) is maintained as is, and both molds (tl, (61) are cooled.
しかして以上の如きディスクの射出成形によれば金型（
１１，（６）により形成されるキャビティ （１１）内
への溶融樹脂材（１２）の射出時には、溶融樹脂材（１
２）に不要な応力を与えることがない。更に可動金型（
１）によるキャビティ（１１）内の溶融樹脂材（１２）
の加圧により、溶融樹脂材（１２）に一様に圧力を加え
ることが出来るので、スタンパ−（２）の外周部分（２
ａ）においても内周部分（２ｂ）側と同様にスタンパ−
（２１の信号の転写性が非常に良くなる。しかも射出成
形されたディスク（１３）の高分子配合及び残留応力が
そのディスク（１３）の中心側から最外周に至る全域に
おいてはり一様となり、ディスク（１３）に内部歪みが
発生ずるようなことは殆んどないので、ディスク（１３
）の複屈折は後述する如く極めて小さくなる。However, according to the injection molding of the disc as described above, the mold (
11, (6) When injecting the molten resin material (12) into the cavity (11), the molten resin material (12) is injected into the cavity (11) formed by
2) No unnecessary stress is applied. Furthermore, the movable mold (
Molten resin material (12) in the cavity (11) according to 1)
By pressurizing the molten resin material (12), pressure can be uniformly applied to the molten resin material (12).
In a) as well, the stamper
(Transferability of the signal 21 becomes very good. Moreover, the polymer composition and residual stress of the injection-molded disk (13) become uniform over the entire area from the center side to the outermost circumference of the disk (13), There is almost no possibility that internal distortion will occur in the disk (13), so the disk (13)
) has an extremely small birefringence as described below.
次に第５図によって前述した金型構造を駆動制御するた
めの型締め駆動制御回路の一例を説明する。なお、第５
図は直圧式の油圧回路を示している。Next, an example of a mold clamping drive control circuit for driving and controlling the above-mentioned mold structure will be explained with reference to FIG. In addition, the fifth
The figure shows a direct pressure type hydraulic circuit.
前記可動金型（１）を前後進させる型締めラム機構（２
１）にサーボ弁機構（２２）が接続され、この号−ボ弁
機構（２２）には型締圧調節器（２３）が接続されてい
る。そして型締圧力調節器（２３）は型締めラム機構（
２１）に圧力検出器（２４）を介して接続され、またプ
ログラム設定器（２５）が接続されている。A mold clamping ram mechanism (2) that moves the movable mold (1) back and forth.
A servo valve mechanism (22) is connected to 1), and a mold clamping pressure regulator (23) is connected to this servo valve mechanism (22). The mold clamping pressure regulator (23) is operated by the mold clamping ram mechanism (
21) via a pressure detector (24), and a program setting device (25).
このように構成される型締め駆動制御回路による型締め
動作を説明する。The mold clamping operation by the mold clamping drive control circuit configured as described above will be explained.
先ず、プログラム設定器（２５）に前述した可動金型口
）の型締め圧の印加タイミングを記憶させておき、この
プログラム設定器（２５）の出力を型締圧力調節１（２
３）に加えてこれを制御し、この調節器（２３）により
サーボ弁機構（２２）を作動させて型締めラム機構（２
１）の油圧及び作動時間を制御して可動金型＋１１と固
定金型（２）との間のキャビティ（１１）内への溶融樹
脂材（１２）の射出工程中又は射出工程完了後における
可動金型（１１の型締め圧力を所要時間内で変化させる
。First, the application timing of the mold clamping pressure of the movable mold opening described above is stored in the program setting device (25), and the output of this program setting device (25) is used as mold clamping pressure adjustment 1 (2).
3), the regulator (23) operates the servo valve mechanism (22) to control the mold clamping ram mechanism (2).
The hydraulic pressure and operating time of 1) are controlled during the injection process of the molten resin material (12) into the cavity (11) between the movable mold +11 and the fixed mold (2) or after the completion of the injection process. The clamping pressure of the mold (11) is changed within the required time.
この型締めラム機構（２１）の作動において可動金型１
１）に加えられる型締め圧は圧力検出器（２４）におい
て検出し、この検出信号により型締圧力調節器（２３）
が制御されて、サーボ弁機構（２２）を所要状態で作動
させる。In the operation of this mold clamping ram mechanism (21), the movable mold 1
The mold clamping pressure applied to 1) is detected by the pressure detector (24), and this detection signal is used to control the mold clamping pressure regulator (23).
is controlled to operate the servo valve mechanism (22) in the required state.
即ち、第２図で説明した型閉じ状態において可動金型（
１１に加えられる型締め圧は圧力検出器（２４）によっ
て検出され、この型閉じ状態では型締め圧はＯｋｇ ／
ａＪ付近となっており、型閉じ完了後に、１８３図で
説明したキャビティ（１１）内への溶融樹脂材（１２）
の射出工程が開始される。なおこの射出工程は圧力検出
器（２４）からの型締め圧検出信号に基づいて開始され
る。That is, the movable mold (
The mold clamping pressure applied to 11 is detected by a pressure detector (24), and in this mold closed state, the mold clamping pressure is Okg/
It is near aJ, and after the mold is closed, the molten resin material (12) flows into the cavity (11) explained in Fig. 183.
The injection process is started. Note that this injection process is started based on a mold clamping pressure detection signal from the pressure detector (24).
次に第４ＬＩＵで説明した如く上記射出工程中又はその
射出工程の完了後に、プログラム設定！Ｉ（２５）から
の時間圧力設定信号によって、型締圧力調節器（２３）
が制御され、型締め圧力を所要時間内（両金型（１）
、 （６）の冷却過程までの関）において連続的に変化
させる。Next, as explained in the 4th LIU, during or after the injection process is completed, set the program! The mold clamping pressure regulator (23) is controlled by the time pressure setting signal from I (25).
is controlled and mold clamping pressure is maintained within the required time (both molds (1)
, (6) until the cooling process).
例えば直径１３ａａのディスクの場合は第６図に示す如
く型締め圧２０ｔｏｎで溶融樹脂材の射出を行いこの射
出工程完了時点ａから０．７〜１ 、５ｓｅｃの間すに
型締め圧力を２０ ｔｏｎから２６ｔｏｎに増圧し、ま
た直径・２０ｃｍのディスクの場合は第７図に示す如く
、型締め圧３０ｔｏｎで溶融樹脂材の射出を行いこの射
出工程完了時点Ｃから０．８〜２．０ｓｅ（の間ｄに型
締め圧力を３０ｔｏｎから４５ｔｏｎに増圧した。また
、直径１３ａｉのディスクの場合において第８図に示す
如く型締め圧３Ｑｔｏｎによる射出工程の完了時点ｅか
ら０．１〜０．２ｓｅｃ経過後ｆ、 ０．５〜１．５
ｓｅｃの間ｇに型締め圧力３０ｔｏｎから２２ ｔｏｎ
に減圧した。For example, in the case of a disk with a diameter of 13 aa, as shown in Fig. 6, the molten resin material is injected at a mold clamping pressure of 20 tons, and the mold clamping pressure is increased to 20 tons for 0.7 to 1.5 seconds from the injection process completion point a. In the case of a disk with a diameter of 20 cm, the molten resin material was injected at a mold clamping pressure of 30 tons as shown in Fig. During interval d, the clamping pressure was increased from 30 tons to 45 tons.In addition, in the case of a disk with a diameter of 13ai, as shown in Fig. 8, 0.1 to 0.2 seconds elapsed from the completion point e of the injection process with a clamping pressure of 3Qton. Rear f, 0.5-1.5
Mold clamping pressure from 30 tons to 22 tons during sec
The pressure was reduced to
このように型締め圧力を増圧又は減圧した状態はディス
ク（１３）が成形完了されるまで（両金型（１１、＋６
１の冷却工程が完了するまで）維持されて前述した効果
を有するディスク（１３）が成形される。In this way, the mold clamping pressure is increased or decreased until the molding of the disk (13) is completed (both molds (11, +6
1) until the completion of the cooling step 1) to form a disk (13) with the above-mentioned effect.
第９図は射出成形機の他例を示し、この成形機は可動金
型＋１１の支持盤を二重（２６ａ ） （２６ｂ ）
にしてトグル機構（２７）により型締め動作するように
構成したものでこの成形機においても支持盤（２６ａ）
と（２６ｂ）との間に油圧制？Ｉ１機構（２８）を備え
、この油圧制御機構（２８）を前述した型締め駆動制御
回路により制御することにより可動金型＋１１の型締め
圧力を可変することが出来る。Fig. 9 shows another example of an injection molding machine, and this molding machine has two support plates for the movable mold + 11 (26a) (26b).
This molding machine is configured so that the mold is clamped by a toggle mechanism (27), and the support plate (26a)
Hydraulic system between and (26b)? An I1 mechanism (28) is provided, and the clamping pressure of the movable mold +11 can be varied by controlling this hydraulic control mechanism (28) by the clamping drive control circuit described above.
以上述べた通り、本発明の射出成形方法により成形され
た光学式ディスク（直径１２■）の複屈折の測定値は第
１Ｏ図に示す如く、ディスクの中心側から最外周に至る
全域において実用範囲を満足した。これは第１１図に示
す従来の射出方法により得たディスクの複屈折値Ａ、
Ｂ （なおＡ、Ｂはディスクの異なる条件による測定値
である。）に比しいかに優れているか理解されよう。As mentioned above, the measured values of birefringence of the optical disc (diameter 12 cm) molded by the injection molding method of the present invention are within the practical range over the entire area from the center to the outermost periphery of the disc, as shown in Figure 1O. Satisfied. This is the birefringence value A of the disk obtained by the conventional injection method shown in FIG.
It will be appreciated how superior this is compared to B (note that A and B are measured values under different conditions for the disc).
以上、本発明の実施例を述べたが、本発明の技術的思想
に基づいて各種の変更かり能である。Although the embodiments of the present invention have been described above, various modifications can be made based on the technical idea of the present invention.
例えば、型締め駆動制御回路として油圧回路を不したが
、加圧エアを用いる駆動制御回路であっても良い。For example, although a hydraulic circuit is not used as the mold clamping drive control circuit, a drive control circuit using pressurized air may be used.
型締め圧作動構造はラム機構、トグル機構によらなくて
も、その他の如何なる構造であっても良い。The mold clamping pressure operating structure does not need to be based on a ram mechanism or a toggle mechanism, and may be any other structure.
また本発明は、ビデオディスクやドローディスク等の如
き光学式ディスクの射出成形機に限定されることなく、
その他の各種部材の射出成形機に通用可能である。Furthermore, the present invention is not limited to injection molding machines for optical discs such as video discs, draw discs, etc.
It can be used in injection molding machines for other various parts.
以上のように本発明によれば大径の光学式ディスク等を
射出成形する場合においても内部歪を極力少なくするこ
とが出来るので、その射出成形時におけるスタンパ−の
信号の転写性が非常に良く、かつ射出成形された光学式
ディスク等の複屈折値が極めて小さくなり外周部におい
ても変動せず、光学特性が安定した光学ディスク等を射
出成形することが出来る。As described above, according to the present invention, internal distortion can be minimized even when injection molding large-diameter optical discs, etc., so the transferability of stamper signals during injection molding is very good. In addition, the birefringence value of the injection-molded optical disk is extremely small and does not change even in the outer circumference, making it possible to injection-mold an optical disk or the like with stable optical characteristics.
第１図は本発明に用いられる射出成形機の金型の型開き
状態における断面図、第２図は同金型の型閉じ状態にお
ける断面図、第３図は同金型のキャビティ内に溶融樹脂
材が射出された状態における断面図、第４図は同金型の
キャビティ内に溶融樹脂材が射出される間又は射出後可
動金型に型締め圧力が加わった状態における断面図、第
５図は第１図〜第４図に示された金型の動作を制御する
一例の駆動制御機構の系統図、４６図〜第８図は可動金
型の型締め制御圧力値と時間の関係を示ず図、第９図は
同、他例の駆動制御機構の平面図、第１０図は本発明に
より成形されたディスクの複屈折値を示すグラフ、第１
１図は従来の射出成形方法により得られたディスクの複
屈折値を示すグラフである。
図中、（１１は可動金型、（２）はスタンパ−１＋３１
、 ＋４１ば内外周スタンパ−押え、（６）は固定金
型、（８）は射出ノズル、（９）は湯口筒体、（１１）
はキャビティ、（１２）は溶融樹脂材、（１３）はディ
スク、（２１）は型締めラム機構、（２２）はサーボ弁
機構、（２３）は型締圧力調節器、（２５）はプログラ
ム設定器である。
金型の杷例／１１［勤副惰ｌ幾溝の平面口笛９図
本茫Ｂ１４ｔこよ３デシスクの複Ｓ：！ｒｒ橿しポすグ
ラフ第１ａ図
χ
（ｎｍ）
複
星 ２０ ４ 、χ 。
従来めＬ又りの４屈１「イｌ ｔ ｒｒ−了グラフ第１
１図Figure 1 is a sectional view of the injection molding machine used in the present invention in an open state, Figure 2 is a sectional view of the same mold in a closed state, and Figure 3 is a sectional view of the mold in the mold cavity. Fig. 4 is a sectional view of the state in which the resin material has been injected; Fig. 4 is a sectional view of the state in which clamping pressure is applied to the movable mold while the molten resin material is being injected into the cavity of the same mold or after injection; The figure is a system diagram of an example of the drive control mechanism that controls the operation of the mold shown in Figures 1 to 4, and Figures 46 to 8 show the relationship between the mold clamping control pressure value and time of the movable mold. 9 is a plan view of the drive control mechanism of the same example and another example, and FIG. 10 is a graph showing the birefringence value of the disk molded according to the present invention.
FIG. 1 is a graph showing the birefringence value of a disk obtained by a conventional injection molding method. In the figure, (11 is a movable mold, (2) is a stamper 1+31
, +41 is the stamper holder on the inner and outer circumference, (6) is the fixed mold, (8) is the injection nozzle, (9) is the sprue cylinder, (11)
is the cavity, (12) is the molten resin material, (13) is the disk, (21) is the mold clamping ram mechanism, (22) is the servo valve mechanism, (23) is the mold clamping pressure regulator, and (25) is the program setting. It is a vessel. Mold example / 11 rr radial graph Figure 1a χ (nm) Double star 20 4 , χ. Conventional L-cross 4 bends 1 "Il trr-Ryo graph 1st
Figure 1
Claims (1)
れるキャビティ内に射出してディスクを成形する成形方
法において、 上記樹脂材の射出工程中又は射出工程完了後、上記固定
金型に対する可動金型の型締め圧力を所定の時間内で連
続して変化させて上記キャビティ内の溶融樹脂材を成形
するようにしたことを特徴とするディスクの射出成形方
法。[Scope of Claims] A molding method in which a disk is formed by injecting a molten resin material into a cavity formed between a fixed mold and a movable mold, wherein the resin material is injected during the injection process or during the injection process. After completion of the injection molding process, the molten resin material in the cavity is molded by continuously changing the clamping pressure of the movable mold against the fixed mold within a predetermined period of time. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60250518A JPH0745159B2 (en) | 1985-11-08 | 1985-11-08 | Disk injection molding method and injection molding apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60250518A JPH0745159B2 (en) | 1985-11-08 | 1985-11-08 | Disk injection molding method and injection molding apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62109618A true JPS62109618A (en) | 1987-05-20 |
| JPH0745159B2 JPH0745159B2 (en) | 1995-05-17 |
Family
ID=17209082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60250518A Expired - Lifetime JPH0745159B2 (en) | 1985-11-08 | 1985-11-08 | Disk injection molding method and injection molding apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0745159B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0623435A1 (en) * | 1993-04-30 | 1994-11-09 | Sumitomo Chemical Company, Limited | Process for producing concrete form made of thermoplastic resin |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4968703A (en) * | 1972-09-02 | 1974-07-03 | ||
| JPS5133140A (en) * | 1974-09-13 | 1976-03-22 | Bridgestone Tire Co Ltd | FUHOWAKOBUNSHIKAGOBUTSU NO KAKYOHOHO |
| JPS5214657A (en) * | 1975-07-25 | 1977-02-03 | Matsuda Seisakusho | Injection compressive molding method adapted to mold multiple thin products mainly by picking up them |
| JPS5321257A (en) * | 1976-08-10 | 1978-02-27 | Asahi Dow Ltd | Injection molding method and apparatus |
| JPS5327651A (en) * | 1976-08-27 | 1978-03-15 | Matsuda Seisakusho | Method of controlling mold cramping pressure in injection molder |
| JPS60179216A (en) * | 1984-08-18 | 1985-09-13 | Toshiba Mach Co Ltd | Injection compression mold and injection compression molding method making use of mold |
| JPS6153019A (en) * | 1984-08-24 | 1986-03-15 | Canon Inc | Injection compression molding machine |
| JPS61205112A (en) * | 1985-03-08 | 1986-09-11 | Idemitsu Petrochem Co Ltd | Injection compression molding method |
-
1985
- 1985-11-08 JP JP60250518A patent/JPH0745159B2/en not_active Expired - Lifetime
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4968703A (en) * | 1972-09-02 | 1974-07-03 | ||
| JPS5133140A (en) * | 1974-09-13 | 1976-03-22 | Bridgestone Tire Co Ltd | FUHOWAKOBUNSHIKAGOBUTSU NO KAKYOHOHO |
| JPS5214657A (en) * | 1975-07-25 | 1977-02-03 | Matsuda Seisakusho | Injection compressive molding method adapted to mold multiple thin products mainly by picking up them |
| JPS5321257A (en) * | 1976-08-10 | 1978-02-27 | Asahi Dow Ltd | Injection molding method and apparatus |
| JPS5327651A (en) * | 1976-08-27 | 1978-03-15 | Matsuda Seisakusho | Method of controlling mold cramping pressure in injection molder |
| JPS60179216A (en) * | 1984-08-18 | 1985-09-13 | Toshiba Mach Co Ltd | Injection compression mold and injection compression molding method making use of mold |
| JPS6153019A (en) * | 1984-08-24 | 1986-03-15 | Canon Inc | Injection compression molding machine |
| JPS61205112A (en) * | 1985-03-08 | 1986-09-11 | Idemitsu Petrochem Co Ltd | Injection compression molding method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0623435A1 (en) * | 1993-04-30 | 1994-11-09 | Sumitomo Chemical Company, Limited | Process for producing concrete form made of thermoplastic resin |
| US5525285A (en) * | 1993-04-30 | 1996-06-11 | Sumitomo Chemical Company, Limited | Process for producing concrete form made of thermoplastic resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0745159B2 (en) | 1995-05-17 |
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