JPH08156038A - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPH08156038A JPH08156038A JP33147294A JP33147294A JPH08156038A JP H08156038 A JPH08156038 A JP H08156038A JP 33147294 A JP33147294 A JP 33147294A JP 33147294 A JP33147294 A JP 33147294A JP H08156038 A JPH08156038 A JP H08156038A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- cutter
- gate cutter
- mold
- tip
- 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
- 238000002347 injection Methods 0.000 title abstract 2
- 239000007924 injection Substances 0.000 title abstract 2
- 238000001746 injection moulding Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 abstract description 16
- 229920005989 resin Polymers 0.000 abstract description 16
- 230000003287 optical effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンパクトディスクや
光ディスク等のディスク成形用金型に関する。従来、金
型内でゲートカッタのみの駆動でゲートを剪断するもの
として、図４ないし図５に示す形式のものがある。この
タイプはゲートカッタ１の先端部を２段の同心円筒状に
形成し、先端の小径円筒部１ａは型締時にダイス２とゲ
ート厚ｔのクリアランスとゲートランド部ｇを設けた構
造となっている。そのため、ゲートランド部ｇによりキ
ャビティ３への流入樹脂の整流は行なわれるものの、ゲ
ートランド部からキャビティー３への樹脂流路が屈曲し
ているため、樹脂の流動抵抗が増大し、それ故スプルー
の離型性を悪化させる欠点があった。さらに、ゲートカ
ッタ１の微小な傾きでもゲート厚ｔが小径円筒部１ａの
円周方向で均一でなくなるため、キャビティ３への樹脂
の充填に際し、円周方向での樹脂の圧力伝達が不均一と
なり、円周方向での樹脂の内部組織が不均一となり光学
特性や転写特性の均一性を妨げる欠点があった。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a disc such as a compact disc or an optical disc. Conventionally, there is a type shown in FIGS. 4 to 5 for shearing a gate by driving only a gate cutter in a mold. In this type, the tip portion of the gate cutter 1 is formed in a two-stage concentric cylindrical shape, and the small diameter cylindrical portion 1a at the tip has a structure in which a die 2 and a clearance of a gate thickness t and a gate land portion g are provided at the time of mold clamping. There is. Therefore, although the resin flowing into the cavity 3 is rectified by the gate land portion g, the resin flow path from the gate land portion to the cavity 3 is bent, so that the flow resistance of the resin is increased and therefore the sprue is increased. However, there was a drawback that the mold releasability of was deteriorated. Further, even if the gate cutter 1 is slightly inclined, the gate thickness t is not uniform in the circumferential direction of the small-diameter cylindrical portion 1a, so that when the resin is filled in the cavity 3, the resin pressure transmission in the circumferential direction becomes uneven. However, the internal structure of the resin in the circumferential direction becomes non-uniform, which impedes the uniformity of optical characteristics and transfer characteristics.
【０００２】[0002]
【発明が解決しようとする課題】本発明は、ゲートから
キャビティ内へ流入する樹脂の流動抵抗を低減し、スプ
ルーの離型性を向上させるとともに、常時円周方向にお
けるゲート厚を均一に保ち、製品の光学特性ならびに転
写特性の均一化を図ることを目的とする。SUMMARY OF THE INVENTION The present invention reduces the flow resistance of resin flowing from the gate into the cavity, improves the mold release property of the sprue, and always keeps the gate thickness in the circumferential direction uniform. The objective is to make the optical and transfer characteristics of the product uniform.
【０００３】[0003]
【課題を解決するための手段】固定金型６内にスプルー
ブッシュ７とダイス２を固設し、前記スプルーブッシュ
７に対向してその先端中心部にアンダーカット部ｅを穿
設せるゲートカッタ１を可動金型９内に摺動可能に設置
してなる射出成形用金型において、該ゲートカッタ１の
先端部に扁平形状のゲートランド部ｇを形成させたこと
を特徴とする。そして、前記アンダーカット部ｅの直径
ｃをゲートカッタ１の直径ｄの１／２〜１／３の大きさ
にしてゲートカッタ１の先端部に扁平形状の大きいゲー
トランド部ｇを形成させたことである。[MEANS FOR SOLVING THE PROBLEMS] A gate cutter 1 in which a sprue bush 7 and a die 2 are fixedly mounted in a fixed mold 6 and an undercut portion e is bored at the center of the tip facing the sprue bush 7. In a mold for injection molding, which is slidably installed in the movable mold 9, a flat gate land portion g is formed at the tip of the gate cutter 1. The diameter c of the undercut portion e is set to 1/2 to 1/3 of the diameter d of the gate cutter 1, and a large flat gate land portion g is formed at the tip of the gate cutter 1. Is.
【０００４】[0004]
【作用】本発明では、溶融樹脂は扁平な流路ｂ部で整流
されてからキャビティ３へ充填されるため、樹脂の流動
抵抗を減少させるのでスプルーの離型性を向上させる。
またゲートカッタ１の先端部を扁平形状としてゲートカ
ッタの多少の傾きがあっても、ゲート厚ｔの円周方向の
均一性を保持してキャビティー３ヘ樹脂を均一に流入さ
せることにより、製品の光学特性、転写特性を向上させ
る。In the present invention, the molten resin is rectified in the flat flow path b and then filled into the cavity 3, so that the flow resistance of the resin is reduced and the mold release property of the sprue is improved.
Further, even if the tip end of the gate cutter 1 has a flat shape and the gate cutter is slightly inclined, the uniformity of the gate thickness t in the circumferential direction is maintained and the resin is made to uniformly flow into the cavity 3. To improve optical characteristics and transfer characteristics.
【０００５】[0005]
【実施例】つぎに、本発明の実施例について図１〜図２
に基づき説明する。図１は本発明のゲートカッタを装備
する金型の断面図、図２は図１の要部拡大図である。４
はノズル、５は固定プラテン、６は固定金型、７は固定
金型に固設されているスプルーブッシュ、８は可動プラ
テン、９は可動金型、１０はゲートカッタの中心孔に挿
通するエジェクターピン、１１はゲートカッタ１を挿通
するスリーブである。本発明は、ゲートカッタの先端部
を扁平形状とし、中心部に穿設されているアンダーカッ
ト部の直径ｃをゲートカッタの直径ｄの約１／２〜１／
３とし、ゲートランド部ｇを大きくした構造にした点で
ある。上記構造としたことにより、溶融樹脂はノズル４
からスプルーブッシュ７を経由してスプルーブッシュ７
の扁平な先端部とゲートカッタ１の先端部の扁平なゲー
トランド部ｇとで形成される扁平な流路ｂで整流されて
キャビティー３へ充填される。図３は、金型、成形機、
成形条件を同一条件にして、本発明にかかるゲートカッ
タ、及び図４に示す従来のゲートカッタを用いてディス
クを成形したときの充填圧力とを比較した実測値であ
る。横軸は時間（秒）、縦軸は圧力（kgf/cm2）であ
る。図中実線は本発明、点線は従来例によるときであ
る。この図から本発明におけるゲート通過時の圧力が９
５kgf/cm2となっており、従来の１００kgf/cm2に比べて
約５％低く、樹脂がキャビティ内に充填される間本発明
の方が全体的に低下していることが確認された。このこ
とは、ゲートカッタ１の先端部を扁平形状にしゲートラ
ンド部ｇを大きくしたことにより流路ｂ部で整流される
ため樹脂の流動抵抗が減少していることを物語ってお
り、ダイスの内壁に加わる圧力が低下し、スプルーの離
型性の向上に寄与している。EXAMPLES Next, examples of the present invention will be described with reference to FIGS.
It will be explained based on. FIG. 1 is a sectional view of a mold equipped with a gate cutter of the present invention, and FIG. 2 is an enlarged view of a main part of FIG. Four
Is a nozzle, 5 is a fixed platen, 6 is a fixed mold, 7 is a sprue bush fixed to the fixed mold, 8 is a movable platen, 9 is a movable mold, and 10 is an ejector which is inserted through the center hole of the gate cutter. Pins 11 are sleeves through which the gate cutter 1 is inserted. According to the present invention, the tip portion of the gate cutter has a flat shape, and the diameter c of the undercut portion formed in the center portion is about 1/2 to 1/1 / the diameter d of the gate cutter.
3 and the gate land portion g is enlarged. Due to the above-mentioned structure, the molten resin is
From through sprue bush 7 to sprue bush 7
Is rectified by the flat flow path b formed by the flat tip end of the gate cutter 1 and the flat gate land portion g of the tip end of the gate cutter 1, and is filled in the cavity 3. FIG. 3 shows a mold, a molding machine,
It is an actual measurement value obtained by comparing the filling pressure when a disk is molded using the gate cutter according to the present invention and the conventional gate cutter shown in FIG. 4 under the same molding conditions. The horizontal axis represents time (second) and the vertical axis represents pressure (kgf / cm 2 ). In the figure, the solid line represents the present invention and the dotted line represents the conventional example. From this figure, the pressure when passing through the gate in the present invention is 9
Has a 5 kgf / cm 2, about 5% compared to conventional 100 kgf / cm 2 low, the resin, it was confirmed that better between the present invention to be filled into the cavity is entirely decreased. This means that the flow resistance of the resin is reduced because the tip portion of the gate cutter 1 is made flat and the gate land portion g is enlarged so that it is rectified in the flow path b portion, and the inner wall of the die is reduced. The pressure applied to the sprue is reduced, which contributes to the improvement of the mold release property of the sprue.
【０００６】[0006]
【発明の効果】本発明によれば、ゲートカッタ先端部を
扁平面にし、その中心部に穿設せるアンダーカット部の
直径ｃをゲートカッタの直径ｄの１／２以下としてゲー
トランド部ｇを大きくしたことにより、キャビティー３
へ流入する樹脂の流動抵抗が減少し、スプルーの離型性
が向上した。さらに、離型性の向上により、従来ではス
プルー残り等で成形ができなかった成形条件でも成形が
可能（例えばゲートカットのタイミングを遅らせたり、
ゲートカッタ温調温度等の成形条件の設定幅の拡大）と
なった。また、ゲートカッタの先端部を扁平面としたこ
とにより、ゲートカッタの多少の傾きがあってもゲート
厚ｔの円周方向での均一性が保たれるためゲートからキ
ャビティへ樹脂は均一に流入されるので製品の光学特性
及び転写特性を向上させるとともに、ゲートカッタの先
端部の形状が従来に比べ複雑でないので該部の加工が簡
略化され、保守も容易である等の効果がある。According to the present invention, the gate cutter tip is made flat, and the diameter c of the undercut portion formed in the center thereof is set to 1/2 or less of the diameter d of the gate cutter so that the gate land portion g is formed. By making it bigger, cavity 3
The flow resistance of the resin flowing in was reduced, and the mold release property of the sprue was improved. Furthermore, due to the improved mold releasability, it is possible to mold even under molding conditions that could not be molded due to sprue residue etc. (for example, delaying the gate cut timing,
Expanded setting range of molding conditions such as gate cutter temperature control temperature). Further, by making the tip of the gate cutter a flat surface, even if there is some inclination of the gate cutter, the uniformity of the gate thickness t in the circumferential direction is maintained, so that the resin uniformly flows from the gate into the cavity. As a result, the optical characteristics and transfer characteristics of the product are improved, and since the shape of the tip of the gate cutter is less complicated than in the conventional case, the processing of the portion is simplified and maintenance is easy.
【００１２】[0012]
【図１】本発明にかかる金型の概略を示す断面図。FIG. 1 is a sectional view showing an outline of a mold according to the present invention.
【図２】図１の要部の拡大断面図。FIG. 2 is an enlarged cross-sectional view of a main part of FIG.
【図３】本発明と従来例によるときの充填圧力の比較線
図。FIG. 3 is a comparison diagram of filling pressures according to the present invention and a conventional example.
【図４】従来の金型の概略を示す断面図。FIG. 4 is a sectional view schematically showing a conventional mold.
【図５】図４の要部の拡大断面図。5 is an enlarged cross-sectional view of the main part of FIG.
１ ゲートカッタ、 ２ ダイス、 ３
キャビティ、４ ノズル、 ５ 固定
プラテン、６ 固定金型、７ スプルーブッシュ、
８ 可動プラテン、９ 可動金型、１０ エジ
ェクタピン、 １１ スリーブ、ｂ 流路、
ｃ アンダーカット部直径、ｄ ゲ
ートカッタ先端部直径、 ｅ アンダーカット部、ｇ
ゲートランド部、 ｔ ゲート厚1 gate cutter, 2 dice, 3
Cavity, 4 nozzles, 5 fixed platen, 6 fixed mold, 7 sprue bush,
8 movable platen, 9 movable mold, 10 ejector pin, 11 sleeve, b flow path,
c undercut diameter, d gate cutter tip diameter, e undercut portion, g
Gate land part, t Gate thickness
Claims (2)
ス２を固設し、前記スプルーブッシュ７に対向してその
先端中心部にアンダーカット部ｅを穿設せるゲートカッ
タ１を可動金型９内に摺動可能に設置してなる射出成形
用金型において、該ゲートカッタ１の先端部に扁平形状
のゲートランド部ｇを形成させたことを特徴とする射出
成形用金型。1. A movable mold for a gate cutter 1 in which a sprue bush 7 and a die 2 are fixedly mounted in a fixed mold 6, and an undercut portion e is formed at the center of the tip facing the sprue bush 7. An injection-molding die, which is slidably installed inside 9, wherein a flat gate land portion g is formed at the tip of the gate cutter 1.
該ゲートカッタ先端中心部に穿設されるアンダーカット
部ｅの直径ｃをゲートカッタの直径ｄの１／２〜１／３
として、ゲートカッタ１の先端部に扁平形状のゲートラ
ンド部ｇを形成させたことを特徴とする請求項１記載の
射出成形用金型。2. The gate cutter 1 has a flat end portion,
The diameter c of the undercut portion e formed at the center of the tip of the gate cutter is 1/2 to 1/3 of the diameter d of the gate cutter.
2. The injection molding die according to claim 1, wherein a flat gate land portion g is formed at the tip of the gate cutter 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6331472A JP2997395B2 (en) | 1994-12-12 | 1994-12-12 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6331472A JP2997395B2 (en) | 1994-12-12 | 1994-12-12 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08156038A true JPH08156038A (en) | 1996-06-18 |
| JP2997395B2 JP2997395B2 (en) | 2000-01-11 |
Family
ID=18244033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6331472A Expired - Fee Related JP2997395B2 (en) | 1994-12-12 | 1994-12-12 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2997395B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7147814B1 (en) | 1998-02-25 | 2006-12-12 | Fuji Photo Film Co., Ltd. | Injection molding method and injection mold |
| CN102029690A (en) * | 2010-10-29 | 2011-04-27 | 深圳创维－Rgb电子有限公司 | Hot nozzle sprue bush |
-
1994
- 1994-12-12 JP JP6331472A patent/JP2997395B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7147814B1 (en) | 1998-02-25 | 2006-12-12 | Fuji Photo Film Co., Ltd. | Injection molding method and injection mold |
| CN102029690A (en) * | 2010-10-29 | 2011-04-27 | 深圳创维－Rgb电子有限公司 | Hot nozzle sprue bush |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2997395B2 (en) | 2000-01-11 |
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