JPH068019B2 - Mold release method for disk molded products - Google Patents
Mold release method for disk molded productsInfo
- Publication number
- JPH068019B2 JPH068019B2 JP24737089A JP24737089A JPH068019B2 JP H068019 B2 JPH068019 B2 JP H068019B2 JP 24737089 A JP24737089 A JP 24737089A JP 24737089 A JP24737089 A JP 24737089A JP H068019 B2 JPH068019 B2 JP H068019B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- mold
- molded product
- disk
- blown
- 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.)
- Expired - Fee Related
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
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/43—Removing or ejecting moulded articles using fluid under pressure
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Manufacturing Optical Record Carriers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明はディスク成形品の射出成形に関し、特にはそ
の成形後の離型方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to injection molding of disk molded products, and more particularly to improvement of a releasing method after the molding.
（従来の技術） ドローディスクあるいはコンパクトディスク等のディス
ク盤を射出成形するに際して、成形品の表面にしばしば
シミ状の表面不良を生ずることがある。これは一般に
「モヤ不良」と呼ばれ、信号がずれて読み取り不能なも
のあるいは信号ずれはないが外観不良となって商品とな
らないもの等いろんなタイプがある。(Prior Art) When a disk disc such as a draw disc or a compact disc is injection-molded, a stain-like surface defect often occurs on the surface of the molded product. This is generally called "moir defect", and there are various types such as a signal that cannot be read due to a signal shift, or a signal that does not result in a defective appearance but does not become a product.
このようなモヤ不良の原因を追求してみると、ディスク
盤の射出成形後の離型時において型面から成形品を剥す
際のトラブルが原因であることがわかった。すなわち、
射出完了後一定の冷却時間を経て型開きが行なわれる
が、従来では型開き開始後に固定型側から離型用エアー
が吹き出され、また可能型側からのエア吹き出しはエジ
ェクタの突出しと同時かあるいはそのわずか前から行な
われていた。しかるに、この従来方法によると、製品取
り出しのための可動型側からのエア吹き出しが金型が完
全に開いた状態で行なわれるために、吹き出しエアがデ
ィスク表面全面に完全に回りきらないうちに、早くエア
が回りこんだディスク表面部分から外気とつながり、従
ってそこからエア圧力が逃げてしまって、ディスク全面
の十分なエアによる離型がなされないまま、エジェクタ
によって強制的に引き剥されてしまうのである。そし
て、エアが回って離型されている表面部分とエアが回ら
ずに離型が不十分な表面部分との境目にシミ状の表面不
良が現われモヤ不良となるのである。When pursuing the cause of such smear defects, it was found that the trouble was caused when the molded product was peeled from the mold surface at the time of mold release after injection molding of the disc board. That is,
The mold is opened after a certain cooling time after the completion of injection, but conventionally, the mold releasing air is blown out from the fixed mold side after starting the mold opening, and the air blowing from the possible mold side is the same as the ejector protruding or It had been done just before that. However, according to this conventional method, air is blown from the movable mold side for taking out the product in a state where the mold is completely opened, so that the blown air does not completely reach the entire disk surface, Since the air quickly circulates and connects to the outside air from the surface of the disk, the air pressure escapes from there, and the ejector forces it to be peeled off without sufficient air release from the entire surface of the disk. is there. Then, a stain-like surface defect appears at the boundary between the surface portion where the air is released and the mold is released and the surface portion where the air is not released and the mold is insufficiently released, which causes a smear defect.
（発明が解決しようとする課題） この発明はこのようなディスク盤の射出成形において特
有な表面不良を解消するために提案されたものであっ
て、特には離型時におけるエア吹き出しを効果的に行な
うことによってディスク表面の離型を完全になしもって
前述のような表面不良の発生を完全に回避することがで
きる発明を提案するものである。(Problems to be Solved by the Invention) The present invention has been proposed in order to eliminate a surface defect peculiar to such an injection molding of a disc board, and in particular, effectively blows air at the time of mold release. The present invention proposes an invention capable of completely releasing the disk surface by performing the above-mentioned steps and completely avoiding the occurrence of the above-mentioned surface defect.
（課題を解決するための手段） すなわち、この発明は、ディスク成形品を射出完了後金
型から離型するに際して、成形型の型開き直前に固定型
側から前記成形品に対して離型用エアを吹き出すととも
に、前記固定側離型用エアの吹き出しとほぼ同時あるい
はわずかに遅れて可動型側からも前記成形品に対して浮
出用エアを吹き出して型開きを始め、型開き後再度可能
型側より取出用エアを吹き出して成形品を取出すことを
特徴とするディスク成形品の離型方法に係るものであ
る。(Means for Solving the Problem) That is, according to the present invention, when a disk molded product is released from a mold after completion of injection, the fixed mold side is used to release the molded product from the fixed mold immediately before the mold is opened. In addition to blowing air, the floating air is blown onto the molded product from the movable mold side almost at the same time as or slightly after the fixed side mold release air is blown, and mold opening starts, and it is possible again after mold opening. The present invention relates to a method for releasing a disk molded product, characterized in that a molded product is taken out by blowing out ejection air from the mold side.
（作用） この発明によれば、成形型の型閉め開き直前において、
固定型側から前記成形品に対して離型用エアが、また前
記固定側離型用エアの吹き出しとほぼ同時あるいはわず
かに遅れて可動型側からも前記成形品に対して浮出用エ
アがそれぞれ吹き出される。すなわち、この発明におい
ては型閉め状態でエアの吹き出しが行なわれるために、
内側からのエアがディスクの一部分から外気に逃げると
いうことが無いので、ディスク全面にエアが回り込み完
全な離型が実現される。(Operation) According to the present invention, immediately before the mold is opened and closed,
Mold release air from the fixed mold side to the molded product, and floating air to the molded product from the movable mold side almost simultaneously with or slightly behind the fixed side mold release air blowing. Each is blown out. That is, in the present invention, since air is blown out in the mold closed state,
Since the air from the inside does not escape from a part of the disc to the outside air, the air wraps around the entire face of the disc and complete release is realized.
さらに、型開き後の製品取出し時においては再度可動型
側より取出用エアが吹き出される。Further, when the product is taken out after the mold is opened, the take-out air is blown again from the movable mold side.
つまり、この発明においては、可動型側からのエア吹き
出しは浮出用エアと取出用エアの二段で行なわれるわけ
である。これは、前記の浮出用エアをそのまま継続して
長時間成形品に吹き続けると、エアブローによる冷却の
ために成形品が変形するおそれがあり、また、先の浮出
用エアだけで取出用エアが無い場合には今度はエジェク
タの突出時に無理な力がかかり変形が生ずるからであ
る。That is, in the present invention, the air is blown out from the movable mold side in two stages: the air for floating and the air for taking out. This is because if the above-mentioned buoyancy air is continuously blown on the molded product for a long time, the molded product may be deformed due to cooling by air blow. This is because when there is no air, an excessive force is applied when the ejector projects and deformation occurs.
（実施例） 以下添付の図面に従って、この発明の実施例を説明する
と、第１図はディスク成形用の射出成形用金型の部分断
面図、第２図はこの発明のエア吹き出し状態を従来方法
と対比して表わしたタイムチャート図である。(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of an injection molding die for disk molding, and FIG. It is a time chart figure compared and represented.
まず第１図において、符号１０は固定盤であり、これに
固定側取付盤１１および固定側嵌挿部材１３を介して固
定側ミラープレート１４が取付けられる。固定側ミラー
プレート１４には冷却溝１４ａが設けられており、その
中心部に設けたメスカッタ１５の内孔にはスプルブッシ
ュ１６が摺動自在に嵌挿される。符号１７はロケートリ
ング、１９はディスクの成形キャビティである。First, in FIG. 1, reference numeral 10 is a fixed plate, to which a fixed side mirror plate 14 is attached via a fixed side attachment plate 11 and a fixed side fitting member 13. The stationary mirror plate 14 is provided with a cooling groove 14a, and a sprue bush 16 is slidably fitted in an inner hole of a meskatter 15 provided at the center thereof. Reference numeral 17 is a locate ring, and 19 is a molding cavity of the disk.
また、符号２０で示すのが可動盤で、図示を省略した可
動側取付部材を経て、可動側部材２５および可動側嵌挿
部材２７を介して可動側ミラープレート２８が取付けら
れる。符号２８ａは可動側ミラープレート２８に設けら
れた冷却溝である。Further, a movable plate is shown by reference numeral 20, and the movable side mirror plate 28 is attached via a movable side mounting member (not shown), a movable side member 25, and a movable side fitting member 27. Reference numeral 28a is a cooling groove provided in the movable side mirror plate 28.
可動側ミラープレート２８の表面には、スタンパ３５が
外周スタンパ押え３６および内周スタンパ押え３７によ
って取付けられる。符号２９はブッシュ、４０はオスカ
ッタ、５０はエジェクタ、５１は中心突出ピンである。A stamper 35 is attached to the surface of the movable side mirror plate 28 by an outer peripheral stamper retainer 36 and an inner peripheral stamper retainer 37. Reference numeral 29 is a bush, 40 is an male cutter, 50 is an ejector, and 51 is a central protruding pin.
この成形型のエア吹き出しは、固定盤１０側（固定側と
もいう。）においては、エア通路６０および６１を経て
固定部材１５の外周にキャビティに対し環状に形成され
たエア吹出部６２よりなされ、可動盤２０側（可動側と
もいう。）では、エア通路６５および６６を経て内周ス
タンパ押え３７の内側に同じくキャビティに対し環状に
形成されたエア吹出部６７よりなされる。On the stationary plate 10 side (also referred to as a stationary side), the air is blown out from the molding die by an air outlet 62 formed in an annular shape with respect to the cavity on the outer periphery of the stationary member 15 via the air passages 60 and 61. On the movable platen 20 side (also referred to as the movable side), an air blowing portion 67 is formed inside the inner peripheral stamper retainer 37 via the air passages 65 and 66 and is also annularly formed with respect to the cavity.
次に第２図のタイムチャートに従って、この発明のエア
吹き出し状態を従来方法と対比しつつ説明する。Next, referring to the time chart of FIG. 2, the air blowing state of the present invention will be described in comparison with the conventional method.
図示のように、この発明では、射出完了後、一定の冷却
時間を置いた後、成形型の型開き直前において、固定型
側のエア吹出し部６２からディスク成形品に対して離型
用エアが吹き出される。この型開き直前とは、型開きの
０．３〜０．５秒前でエアの吹出しは約０．５〜１秒間
行なわれる。As shown in the figure, in the present invention, after a certain cooling time is set after the completion of injection, immediately before the mold opening of the molding die, the release air is blown from the air blowout portion 62 on the fixed die side to the disc molded article. Blown out. Immediately before the mold opening, the air is blown out for about 0.5 to 1 second 0.3 to 0.5 seconds before the mold opening.
この固定側離型用エアの吹き出しとほぼ同時あるいはわ
ずかに遅れで可動型側からもそのエア吹出部６７より該
ディスク成形品に対して浮出用エアが吹き出される。実
施例では可動側エアは前記固定側エアより０．２秒遅れ
て約０．５秒間吹出される。At almost the same time as or slightly after the blowing of the fixed-side releasing air, the floating air is blown from the air blowing portion 67 to the disk molded product from the movable die side. In the embodiment, the movable side air is blown out for about 0.5 seconds after the fixed side air is delayed by 0.2 seconds.
前述したように、この発明においては型閉め状態でエア
の吹き出しが行なわれるために、固定型および可動型エ
ア吹出部６２，６７からディスク内面側に吹き付けられ
たエアがディスクの一部分から外気に逃げるということ
が無くなり、ディスク全面にエアが回り込み完全な離型
が実現されるのである。As described above, in the present invention, since air is blown out in the mold closed state, the air blown from the fixed and movable air blowout portions 62 and 67 to the inner surface of the disk escapes from the part of the disk to the outside air. This eliminates the problem, and air wraps around the entire surface of the disk, achieving complete release.
なお、上の場合において、固定型側からのエア吹出し
は、ディスク成形品を固定型キャビティ面から離型させ
るためのものであるが、可動型側からの第一次のエア吹
き出しはディスク成形をスタンパ３５面から浮き出させ
るものである。ディスク成形品はその表面が可動型キャ
ビティ面から浮き出しても、成形品の外周部および内周
部においてキャビティ部に保持されているので型開き時
のエジェクタ突出し前に成形品自体が該キャビティから
脱落するようなことは無い。In the above case, the air blowing from the fixed mold side is for releasing the disk molded product from the fixed mold cavity surface, but the primary air blowing from the movable mold side does not cause the disk molding. It is to be raised from the surface of the stamper 35. Even if the surface of the disk molded product floats up from the cavity surface of the movable mold, it is held in the cavity at the outer and inner peripheral parts of the molded product, so the molded product itself falls off from the cavity before the ejector protrudes when the mold is opened. There is nothing to do.
そして、型開きが進行し完了すると、製品取出しが行な
われるわけであるが、この取出し時においては再度可動
型側より取出用エアが吹き出され、エジェクタ５０によ
って成形品の突出しが行なわれる。Then, when the mold opening progresses and is completed, the product is taken out. At this time, the take-out air is again blown from the movable mold side, and the ejector 50 causes the molded product to be ejected.
図からも理解されるように、実施例では、エアの吹き出
しのためのタイマーは射出完了の信号から開始されるよ
うになっている。エアの吹き出しを型開き前から行なう
ことによるものである。なお、従来ではエアの吹き出し
の信号は冷却完了時から取っていた。また、この発明で
は、前記のように、可動型側からのエア吹き出しが浮出
用エアと取出用エアと前後二段で行なわれるのである
が、この二段制御は２つのバルブによって制御すること
も、単一のバルブによって時間的に制御することも可能
である。複数のバルブを使用する場合には浮出用エアと
取出用エアのエア量を、つまり突出し力を自由に調整で
きる利点がある。As will be understood from the figure, in the embodiment, the timer for blowing out the air is started from the signal indicating the completion of injection. This is because air is blown out before the mold is opened. It should be noted that in the past, the signal of blowing air was taken from the time when cooling was completed. Further, according to the present invention, as described above, the air is blown from the movable mold side in two stages, the front air and the take-out air, and the front and rear air. The two-stage control is controlled by two valves. It is also possible to control in time by a single valve. When using a plurality of valves, there is an advantage that the air amounts of the air for extraction and the air for extraction, that is, the protruding force can be freely adjusted.
（効果） 以上説明したように、この発明によれば成形後の型開き
離型時におけるエア吹き出しが効果的に行なわれ、従っ
てディスク表面の離型が完全に行なわれるので、従来の
ような離型不十分による表面不良（モヤ不良）の発生を
完全に回避することができるようになった。(Effects) As described above, according to the present invention, air is effectively blown out at the time of mold release after molding, and therefore, the mold release of the disk surface is completely performed. It has become possible to completely avoid the occurrence of surface defects (moir defects) due to insufficient mold.
第１図はディスク成形用の射出成形用金型の部分断面
図、第２図はこの発明のエア吹き出し状態を従来方法と
対比して表わしたタイムチャート図である。 １０…固定盤、１４…固定側ミラープレート、１５…メ
スカッタ、１６…スプルブッシュ、１９…キャビティ、
２０…可動盤、２８…可動側ミラープレート、３５…ス
タンパ、３６…外周スタンパ押え、３７…内周スタンパ
押え、５０…エジェクタ、６０，６１…エア通路、６２
…エア吹出部、６５，６６…エア通路、６７…エア吹出
部。FIG. 1 is a partial cross-sectional view of an injection molding die for disk molding, and FIG. 2 is a time chart diagram showing an air blowing state of the present invention in comparison with a conventional method. 10 ... Fixed board, 14 ... Fixed side mirror plate, 15 ... Mescatta, 16 ... Sprue bush, 19 ... Cavity,
20 ... Movable plate, 28 ... Movable side mirror plate, 35 ... Stamper, 36 ... Outer peripheral stamper retainer, 37 ... Inner peripheral stamper retainer, 50 ... Ejector, 60, 61 ... Air passage, 62
... Air blow-out portion, 65, 66 ... Air passage, 67 ... Air blow-out portion.
Claims (1)
するに際して、成形型の型開き直前に固定型側から前記
成形品に対して離型用エアを吹き出すとともに、前記固
定側離型用エアの吹き出しとほぼ同時あるいはわずかに
遅れて可動型側からも前記成形品に対して浮出用エアを
吹き出して型開きを始め、型開き後再度可動型側より取
出用エアを吹き出して成形品を取出すことを特徴とする
ディスク成形品の離型方法。1. When releasing a disk molded product from a mold after completion of injection, a releasing air is blown from the fixed mold side to the molded product immediately before the mold is opened, and the fixed side mold is released. Almost at the same time as or slightly after the blowing of the working air, the floating air is blown from the movable mold side to the molded product to start mold opening, and after the mold is opened, the take-out air is blown again from the movable mold side for molding. A method for releasing a disk molded product, which comprises removing the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24737089A JPH068019B2 (en) | 1989-09-22 | 1989-09-22 | Mold release method for disk molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24737089A JPH068019B2 (en) | 1989-09-22 | 1989-09-22 | Mold release method for disk molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03108522A JPH03108522A (en) | 1991-05-08 |
| JPH068019B2 true JPH068019B2 (en) | 1994-02-02 |
Family
ID=17162419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24737089A Expired - Fee Related JPH068019B2 (en) | 1989-09-22 | 1989-09-22 | Mold release method for disk molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068019B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105108977B (en) * | 2015-09-29 | 2018-03-23 | 京东方光科技有限公司 | The preparation facilities of injection mold and light guide plate |
-
1989
- 1989-09-22 JP JP24737089A patent/JPH068019B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03108522A (en) | 1991-05-08 |
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