JP2797613B2 - Cassette half - Google Patents
Cassette halfInfo
- Publication number
- JP2797613B2 JP2797613B2 JP2060781A JP6078190A JP2797613B2 JP 2797613 B2 JP2797613 B2 JP 2797613B2 JP 2060781 A JP2060781 A JP 2060781A JP 6078190 A JP6078190 A JP 6078190A JP 2797613 B2 JP2797613 B2 JP 2797613B2
- Authority
- JP
- Japan
- Prior art keywords
- injection material
- primary
- cassette half
- molding
- primary injection
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、二色成形法によって成形され、かつ一次注
入材料部と二次注入材料部とにより構成されたカセット
ハーフに関する。Description: TECHNICAL FIELD The present invention relates to a cassette half formed by a two-color molding method and constituted by a primary injection material portion and a secondary injection material portion.
従来、例えば、第３図に示すようなオーディオカセッ
トハーフ、すなわち、中央部に形成された帯状の透明部
１と、この透明部１の両側部に形成された有色部2,3と
から構成されたオーディオカセットハーフ４を二色成形
法で成形する場合には、まず、透明部１に相当する金型
内のキャビティを可動型体で閉塞した状態で、有色部2,
3に相当するキャビティ内に一次注入材料（有色樹脂）
を供給して一次成形を行い、次いで、可動型体を移動し
て透明部１に相当するキャビティを形成しこのキャビテ
ィ内に二次注入材料（透明樹脂）を供給して二次成形を
完了するようにしている。Conventionally, for example, an audio cassette half as shown in FIG. 3, that is, a band-shaped transparent portion 1 formed in the center portion and colored portions 2 and 3 formed on both sides of the transparent portion 1 is formed. When the audio cassette half 4 is formed by a two-color molding method, first, the cavity in the mold corresponding to the transparent portion 1 is closed with the movable mold, and the colored portions 2 and
Primary injection material (colored resin) in the cavity corresponding to 3
Is supplied to perform primary molding, and then the movable mold is moved to form a cavity corresponding to the transparent portion 1 and a secondary injection material (transparent resin) is supplied into the cavity to complete the secondary molding. Like that.
しかしながら、上記のようにして形成されたカセット
ハーフ４にあっては、その有色部２の外表面の状態が良
好でない場合があり、特に、外表面にシボ加工を施した
場合には、その問題が顕著に現れる。However, in the cassette half 4 formed as described above, the state of the outer surface of the colored portion 2 may not be good, and in particular, when the outer surface is subjected to graining, the problem may occur. Appears remarkably.
そこで、本発明者等がその原因を検討した結果、通
常、上記カセットハーフ４を成形する場合には、ゲート
Ｇをカセットハーフ４の前面の立縁部５に対向して一対
設けて、ここから一次注入材料をキャビティ内に注入し
ているため、有色部２には、両有色部2,3を連結してい
る連結部６を通って一次注入材料が供給されることにな
り、従って、有色部２の樹脂の充填密度がどうしても有
色部３に比べて低くなる。この結果、二次注入材料が注
入された段階において、この二次注入材料の圧力によっ
て有色部２の樹脂が押圧され、ずれ動き易いということ
がわかった。Then, as a result of studying the cause by the present inventors, when molding the cassette half 4, usually, a pair of gates G are provided so as to face the standing edge portion 5 on the front surface of the cassette half 4, and from here, Since the primary injected material is injected into the cavity, the colored portion 2 is supplied with the primary injected material through the connecting portion 6 connecting the two colored portions 2 and 3, and thus the colored portion 2 is supplied. The filling density of the resin in the portion 2 is inevitably lower than that in the colored portion 3. As a result, it was found that at the stage where the secondary injection material was injected, the resin of the colored portion 2 was pressed by the pressure of the secondary injection material and was likely to shift.
また、成形サイクルを短縮しようとするあまり、一次
成形と二次成形との間に十分な時間をおかない場合に
は、有色部2,3の樹脂が十分に冷却固化しない段階で二
次注入材料が注入され、この二次注入材料の圧力によっ
て有色部の樹脂が変形し、有色部2,3の外表面の状態に
悪影響をもたらすということもわかった。Also, if there is not enough time between the primary molding and the secondary molding due to shortening the molding cycle, the secondary injection material is not sufficiently cooled and solidified at the stage where the resin of the colored portions 2 and 3 is solidified. It was also found that the resin in the colored portion was deformed by the pressure of the secondary injection material, which had an adverse effect on the state of the outer surfaces of the colored portions 2 and 3.
本発明は、上記知見に鑑みてなされたもので、その目
的とするところは、一次注入材料部の表面状態を良好に
保持することができ、高品質の製品を得ることができる
カセットハーフを提供することにある。The present invention has been made in view of the above-described findings, and an object of the present invention is to provide a cassette half capable of maintaining a good surface condition of a primary injection material portion and obtaining a high-quality product. Is to do.
上記目的を達成するために、本発明は、二色成形法に
よって成形され、かつ一次注入材料部と、この一次注入
材料部に囲まれた二次注入材料部とにより構成されたカ
セットハーフにおいて、上記一次注入材料部のうち、こ
の一次注入材料部に一次注入材料を注入するゲートの位
置から遠い方の一次注入材料部であって、この一次注入
材料部の内面の、上記二次注入材料部との境界とこの境
界から遠い方の端部との間に、シボ加工を施したもので
ある。In order to achieve the above object, the present invention provides a cassette half formed by a two-color molding method and configured by a primary injection material portion and a secondary injection material portion surrounded by the primary injection material portion, The primary injection material portion, which is farther from the position of the gate for injecting the primary injection material into the primary injection material portion, and the secondary injection material portion on the inner surface of the primary injection material portion. Is grained between the boundary with the edge and the end remote from the boundary.
本発明のカセットハーフにあっては、一次注入材料を
注入するゲートの位置から遠い方の一次注入材料部の内
面の、二次注入材料部との境界とこの境界から遠い方の
端部との間に施したシボ加工によって、一次成形時に一
次注入材料が円滑にこのシボ加工を施した一次注入材料
部に注入されて、充填密度の低下を極力抑制すると共
に、一次注入材料部の内面の表面積を広くして一次成形
後の一次注入材料の冷却固化を促進し、かつ一次注入材
料部の内面のシボ加工面と金型の製品面との摩擦力を高
めて二次成形時の二次注入材料の圧力に対抗する。In the cassette half of the present invention, the boundary between the inner surface of the primary injection material portion remote from the position of the gate for injecting the primary injection material and the secondary injection material portion and the end portion farther from this boundary. During the primary molding, the primary injecting material is smoothly injected into the primary injecting material portion subjected to the graining process by the graining process performed therebetween, thereby suppressing a decrease in the packing density as much as possible, and the surface area of the inner surface of the primary injecting material portion To promote cooling and solidification of the primary injection material after primary molding, and to increase the frictional force between the grained surface of the inner surface of the primary injection material and the product surface of the mold to perform secondary injection during secondary molding. Resists material pressure.
以下、第１図と第２図に基づいて本発明の一実施例を
説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
本発明のカセットハーフは、その有色部２の内面に荒
シボ加工10（第２図において格子状に示されている部
分）が形成されたものである。この荒シボ加工10は、上
記内面に15〜40μｍの凹凸加工を施したものである。In the cassette half of the present invention, a rough embossing process 10 (a portion shown in a lattice shape in FIG. 2) is formed on the inner surface of the colored portion 2. The rough embossing 10 is obtained by subjecting the inner surface to an irregularity processing of 15 to 40 μm.
上記カセットハーフ11を成形するための金型として
は、例えば、第１図に示すように、カセットハーフ11の
外表面を形成する固定型板12と、この固定型板12に対し
て接近離間自在に設けられ、かつ有色部2,3の内面を形
成する可動型板13と、この可動型板13に移動自在に設け
られ、かつ透明部１の内面を形成する可動型体14とから
構成されたものが用いられる。そして、上記可動型板13
の製品面（第１図において右側の製品面）には、上記有
色部２の内面の荒シボ加工10に対応する形態で、荒シボ
加工15が施されている。また、上記可動型体14は、図示
しない駆動機構によって、一次成形時には、固定型板12
に密接して、二次注入材料（透明樹脂）充填空間を閉塞
し、二次成形時には、固定型板12から離れて、二次注入
材料充填空間を形成するようになっている。さらに、一
次注入材料（有色樹脂）をキャビティ内に注入するゲー
トＧは、第３図に示す従来例と同様の位置、すなわち、
カセットハーフ11の前面の立縁部16に対向して一対設け
られている。As a mold for molding the cassette half 11, for example, as shown in FIG. 1, a fixed mold plate 12 forming the outer surface of the cassette half 11, And a movable mold plate 13 that forms the inner surfaces of the colored portions 2 and 3 and a movable mold body 14 that is movably provided on the movable mold plate 13 and that forms the inner surface of the transparent portion 1. Is used. And the movable mold plate 13
1 (the right product surface in FIG. 1) is subjected to rough graining 15 in a form corresponding to the rough graining 10 on the inner surface of the colored portion 2. In addition, the movable mold body 14 is fixed to the fixed mold plate 12 by a driving mechanism (not shown) during the primary molding.
The space for filling the secondary injection material (transparent resin) is closed so that the space for filling the secondary injection material is formed away from the fixed mold plate 12 during the secondary molding. Further, the gate G for injecting the primary injection material (colored resin) into the cavity is located at the same position as the conventional example shown in FIG.
A pair of the cassette halves 11 is provided so as to face the upright edge portion 16 on the front surface.
上記のように構成された射出成形金型を用いてカセッ
トハーフ11を成形する場合には、まず、固定型板12に可
動型板13を密接して型締すると共に、固定型板12に可動
型体14を密接して、二次注入材料充填空間を閉塞した状
態で、キャビティの残りの空間内に一次注入材料（有色
樹脂）を供給して一次成形を行い、有色部2,3を成形す
る。When molding the cassette half 11 using the injection molding die configured as described above, first, the movable mold plate 13 is closely contacted with the fixed mold plate 12, and the movable mold plate 13 is closed. With the mold body 14 closely contacted and the secondary injection material filling space closed, the primary injection material (colored resin) is supplied into the remaining space of the cavity to perform primary molding, and the colored portions 2 and 3 are formed. I do.
この場合、一次注入材料用のゲートＧが、カセットハ
ーフ11の前面の立縁部16に対向して設けられているか
ら、キャビティ内に注入された一次注入材料は、まず、
有色部３に充填され、次いで、一対の連結部６を通って
有色部２に供給されて、一次成形が完了する。In this case, since the gate G for the primary injection material is provided to face the rising edge 16 on the front surface of the cassette half 11, the primary injection material injected into the cavity firstly
The colored portion 3 is filled, and then supplied to the colored portion 2 through the pair of connecting portions 6 to complete the primary molding.
続いて、可動型体14を固定型板12から引き離し、二次
注入材料充填空間を形成した後、二次注入材料（透明樹
脂）を供給して透明部１を成形する。Subsequently, the movable mold 14 is separated from the fixed mold plate 12 to form a space for filling the secondary injection material, and then the secondary injection material (transparent resin) is supplied to form the transparent portion 1.
この場合、上記可動型板13の製品面の、第１図におい
て右側の部分には、荒シボ加工15が施されているから、
この荒シボ加工15によって表面積が広くなって一次成形
後の一次注入材料の冷却が促進され、かつ二次成形時ま
でに十分に固化すると共に、二次注入材料充填時には、
二次注入材料の樹脂圧力を上記荒シボ加工15の摩擦力に
よって受け止めることにより、有色部２が二次注入材料
によってずれ動くことがない。従って、有色部２の表面
にシボ加工等を施した場合でも、有色部２の表面の状態
が良好に保持される。In this case, since the rough surface processing 15 is applied to the right side in FIG. 1 of the product surface of the movable mold plate 13,
This rough graining 15 increases the surface area, promotes cooling of the primary injection material after primary molding, and solidifies sufficiently by the time of secondary molding, and at the time of filling the secondary injection material,
By receiving the resin pressure of the secondary injection material by the frictional force of the rough embossing process 15, the colored portion 2 does not shift due to the secondary injection material. Therefore, even when the surface of the colored portion 2 is subjected to graining or the like, the state of the surface of the colored portion 2 is favorably maintained.
以上説明したように、本発明は、二色成形法によって
成形され、かつ一次注入材料部と、この一次注入材料部
に囲まれた二次注入材料部とにより構成されたカセット
ハーフにおいて、上記一次注入材料部のうち、この一次
注入材料部に一次注入材料を注入するゲートの位置から
遠い方の一次注入材料部であって、この一次注入材料部
の内面の、上記二次注入材料部との境界とこの境界から
遠い方の端部との間に、シボ加工を施したものであるか
ら、上記シボ加工によって、一次成形時に一次注入材料
が円滑にこのシボ加工を施した一次注入材料部に注入さ
れて、充填密度の低下を極力抑制すると共に、一次注入
材料部の内面の表面積を広くして一次成形後の一次注入
材料の冷却固化を促進し、かつ一次注入材料部の内面の
シボ加工面と金型の製品面との摩擦力を高めて二次成形
時の二次注入材料の圧力に対抗することにより、二次成
形時に一次注入材料部が二次注入材料部の樹脂圧でずれ
動くことがなく、かつ一次注入材料部の表面状態を良好
に保持することができる上に、高品質の製品を得ること
ができる。As described above, the present invention relates to a cassette half formed by a two-color molding method and configured by a primary injection material portion and a secondary injection material portion surrounded by the primary injection material portion. Of the injection material portions, the primary injection material portion that is farther from the position of the gate that injects the primary injection material into the primary injection material portion, and the inner surface of the primary injection material portion is in contact with the secondary injection material portion. Since the graining process is performed between the boundary and the end farther from the boundary, the primary injecting material is smoothly applied to the primary injecting material portion which has been subjected to the graining process during the primary molding by the graining process. Injected, while suppressing the decrease in packing density as much as possible, the surface area of the inner surface of the primary injection material part is increased to promote cooling and solidification of the primary injection material after the primary molding, and the inner surface of the primary injection material part is subjected to graining. Face and mold By increasing the frictional force with the product surface and countering the pressure of the secondary injection material at the time of secondary molding, the primary injection material part does not shift due to the resin pressure of the secondary injection material part at the time of secondary molding, In addition, it is possible to maintain the surface condition of the primary injection material portion well and to obtain a high quality product.
第１図と第２図は本発明の一実施例を示すもので、第１
図は射出成形金型の一例を示す断面図、第２図はカセッ
トハーフを裏側からみた下面図、第３図は従来のカセッ
トハーフの斜視図である。 １……透明部（二次注入材料部）、2,3……有色部（一
次注入材料部）、６……連結部、10……荒シボ加工、11
……カセットハーフ、Ｇ……ゲート。1 and 2 show an embodiment of the present invention.
FIG. 2 is a sectional view showing an example of an injection mold, FIG. 2 is a bottom view of the cassette half viewed from the back side, and FIG. 3 is a perspective view of a conventional cassette half. 1 ... Transparent part (secondary injection material part), 2,3 ... Colored part (primary injection material part), 6 ... Connection part, 10 ... Rough graining, 11
...... Cassette half, G ... Gate.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G11B 23/113 510 B29C 45/36──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G11B 23/113 510 B29C 45/36
Claims (1)
入材料部と、この一次注入材料部に囲まれた二次注入材
料部とにより構成されたカセットハーフにおいて、 上記一次注入材料部のうち、この一次注入材料部に一次
注入材料を注入するゲートの位置から遠い方の一次注入
材料部であって、 この一次注入材料部の内面の、上記二次注入材料部との
境界とこの境界から遠い方の端部との間に、シボ加工を
施したことを特徴とするカセットハーフ。1. A cassette half formed by a two-color molding method and composed of a primary injection material portion and a secondary injection material portion surrounded by the primary injection material portion. A primary injection material portion far from a position of a gate for injecting the primary injection material into the primary injection material portion, and a boundary between the inner surface of the primary injection material portion and the secondary injection material portion, and A cassette half characterized by a grained surface between the far end and the end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2060781A JP2797613B2 (en) | 1990-03-12 | 1990-03-12 | Cassette half |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2060781A JP2797613B2 (en) | 1990-03-12 | 1990-03-12 | Cassette half |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03260977A JPH03260977A (en) | 1991-11-20 |
| JP2797613B2 true JP2797613B2 (en) | 1998-09-17 |
Family
ID=13152177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2060781A Expired - Fee Related JP2797613B2 (en) | 1990-03-12 | 1990-03-12 | Cassette half |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2797613B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0726089Y2 (en) * | 1988-03-29 | 1995-06-14 | 三菱マテリアル株式会社 | Multicolor mold |
-
1990
- 1990-03-12 JP JP2060781A patent/JP2797613B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03260977A (en) | 1991-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |