JP2707615B2 - Two-color molding equipment - Google Patents

Two-color molding equipment

Info

Publication number
JP2707615B2
JP2707615B2 JP63179621A JP17962188A JP2707615B2 JP 2707615 B2 JP2707615 B2 JP 2707615B2 JP 63179621 A JP63179621 A JP 63179621A JP 17962188 A JP17962188 A JP 17962188A JP 2707615 B2 JP2707615 B2 JP 2707615B2
Authority
JP
Japan
Prior art keywords
resin
molding
mold
cavity
cassette shell
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 - Lifetime
Application number
JP63179621A
Other languages
Japanese (ja)
Other versions
JPH0229313A (en
Inventor
一樹 仲丸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP63179621A priority Critical patent/JP2707615B2/en
Publication of JPH0229313A publication Critical patent/JPH0229313A/en
Application granted granted Critical
Publication of JP2707615B2 publication Critical patent/JP2707615B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16Making multilayered or multicoloured articles
    • B29C45/1635Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0025Opaque
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026Transparent

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • 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〕 本発明は二色成形に用いる金型装置に関し、特に不透
明樹脂と透明樹脂の二色成形に用いて好適なものであ
る。
The present invention relates to a mold apparatus used for two-color molding, and is particularly suitable for use in two-color molding of an opaque resin and a transparent resin.

〔発明の概要〕[Summary of the Invention]

本発明は二色成形に用いる金型装置において、一次成
形側のキャビティを形成する金型に、二次成形側のキャ
ビティと接するように突出する凸状部を設けることによ
り、この凸状部によって二次成形側の射出圧力を直接的
に受けることになって一次成形側に対する圧力が緩和さ
れ、成形品における一次成形側の第一の樹脂と二次成形
側の第二の樹脂の接合部の変形が防止され一次成形側の
内部歪が緩和されるようにしたものである。
The present invention provides a mold apparatus used for two-color molding, in which a mold that forms a cavity on the primary molding side is provided with a convex portion that projects so as to be in contact with the cavity on the secondary molding side. By directly receiving the injection pressure on the secondary molding side, the pressure on the primary molding side is relaxed, and the joint between the first resin on the primary molding side and the second resin on the secondary molding side in the molded product Deformation is prevented and internal strain on the primary molding side is relieved.

〔従来の技術〕[Conventional technology]

樹脂成形品において、異なる種類の樹脂を一体に成形
する際には、先ず金型内に第一の樹脂(一色目の樹脂)
を射出注入して一次成形を行ない、その後第二の樹脂
(二色目の樹脂)を射出注入して二次成形を行なうこと
により、これら第一の樹脂と第二の樹脂を一体化する、
いわゆる二色成形法が広く実施されている。
When integrally molding different kinds of resins in a resin molded product, first, the first resin (first color resin) is placed in the mold.
To perform primary molding, and then perform secondary molding by injecting and injecting a second resin (second color resin), thereby integrating the first resin and the second resin.
The so-called two-color molding method is widely practiced.

この二色成形法を用いて成形されるものの一例として
例えばテープカセットのシェルがある。即ち、第5図に
示す如く、カセットシェル(1)の本体部(2)を第一
の樹脂としての不透明樹脂によって成形し、その後窓部
(3)を第二の樹脂としての透明樹脂によって一体に成
形する。
An example of a material molded using the two-color molding method is, for example, a tape cassette shell. That is, as shown in FIG. 5, the main body (2) of the cassette shell (1) is formed of an opaque resin as a first resin, and then the window (3) is integrally formed of a transparent resin as a second resin. Mold into

このカセットシェルの二色成形においては、まだ一次
成形側の第一の樹脂が完全に固化していない状態で二次
成形側の第二の樹脂を射出するので、この第二の樹脂の
射出圧力によって第一の樹脂が押圧されて変形し、この
ため第一の樹脂と第二の樹脂との接合部、即ちカセット
シェル(1)の透明窓部(3)の縁部が変形し、本体部
(2)に内部歪が生じ、外観的にもまた強度的にも好ま
しくない不具合がある。
In the two-color molding of the cassette shell, the second resin on the secondary molding side is injected in a state where the first resin on the primary molding side is not completely solidified yet. As a result, the first resin is pressed and deformed, so that the joint between the first resin and the second resin, that is, the edge of the transparent window (3) of the cassette shell (1) is deformed and the main body is deformed. (2) has an internal distortion, which is undesirable in terms of appearance and strength.

そこでこの二次成形時の第二の樹脂の射出圧力による
変形を防止するために、従来は同図中に示すように、カ
セットシェル本体部(2)における窓部(3)の近傍
に、凹形状の溝部(4)を設けるようにした二色成形カ
セットが提案されている(実開昭62-202674号公報)。
Therefore, in order to prevent deformation due to the injection pressure of the second resin at the time of the secondary molding, a concave portion is conventionally provided near the window portion (3) in the cassette shell main body portion (2) as shown in FIG. A two-color molding cassette provided with a groove (4) having a shape has been proposed (Japanese Utility Model Laid-Open No. 62-202674).

即ちこのカセットシェルを成形する二色成形金型装置
は、第6図に示す如く、上部固定金型(10)と、下部固
定金型(11)、及び可動金型(12)とより成る。この金
型装置は可動金型(12)を前進させて上部固定金型(1
0)に密着させた状態で第一の樹脂を成形する一次成形
側キャビティ(13)を形成し、この一次成形側キャビテ
ィ(13)に樹脂注入ゲートから第一の樹脂として不透明
な樹脂(14)を射出注入してカセットシェル(1)の本
体部(2)を成形し(一次成形)、その後可動金型(1
2)を後退移動させることによりこの可動金型(12)と
上部固定金型(10)との間に一次成形部により囲繞され
た二次成形側キャビティ(15)が形成され、この二次成
形側キャビティ(15)に樹脂注入ゲートから第二の樹脂
として透明な樹脂(16)が射出注入して透明窓部(3)
を成形(二次成形)する如く構成され、この金型装置に
おける第一の樹脂を成形する一次成形側キャビティ(1
3)を形成する下部固定金型(11)に、第二の樹脂を成
形する二次成形側キャビティ(15)に近接した位置に凸
状リブ(17)が設けられて成る。
That is, as shown in FIG. 6, the two-color molding die apparatus for molding the cassette shell includes an upper fixed die (10), a lower fixed die (11), and a movable die (12). This mold device moves the movable mold (12) forward and moves the upper fixed mold (1
A primary molding side cavity (13) for molding the first resin in a state of being in close contact with 0) is formed, and an opaque resin (14) is formed as a first resin from the resin injection gate in the primary molding side cavity (13). To form the main body (2) of the cassette shell (1) (primary molding), and then move the movable mold (1).
By retreating 2), a secondary molding side cavity (15) surrounded by a primary molding portion is formed between the movable mold (12) and the upper fixed mold (10). A transparent resin (16) is injected and injected as a second resin from the resin injection gate into the side cavity (15) and a transparent window (3).
Is formed (secondary molding), and the primary molding side cavity (1) for molding the first resin in this mold apparatus is formed.
The lower fixed mold (11) forming 3) is provided with a convex rib (17) at a position close to the secondary molding cavity (15) for molding the second resin.

そしてこのように第一の樹脂を成形する一次成形側キ
ャビティ(13)内に凸状リブ(17)を設けることによ
り、二次成形時の第二の樹脂の射出圧力aをこの凸状状
部(17)で受けることになり、これによって第一の樹脂
により成る一次成形部の変形を防止しようとするもので
ある。前述した第5図におけるカセットシェル本体部
(2)の凹状溝部(4)は、この金型上の凸状リブ(1
7)の痕跡として形成されるものである。
By providing the convex rib (17) in the primary molding side cavity (13) for molding the first resin in this manner, the injection pressure a of the second resin during the secondary molding is reduced by the convex portion. (17) is intended to prevent deformation of the primary molded portion made of the first resin. The concave groove (4) of the cassette shell body (2) in FIG.
It is formed as a trace of 7).

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

しかしながら、従来のこの金型装置においては、凸状
リブ(17)は第二の樹脂を成形する二次成形側キャビテ
ィ(15)より離れた位置に設けられているので、第二の
樹脂の射出圧力を第一の樹脂を介して間接的に受けるこ
とになり、このため凸状リブ(17)と二次成形側キャビ
ティ(15)との間の第一の樹脂は第二の樹脂の樹脂圧を
ほとんど受けることになり、従って第一の樹脂と第二の
樹脂の接合部の変形を防止することはできず、また第一
の樹脂には第二の樹脂の射出圧力によって大きな内部歪
が生じ、このため第一の樹脂に亀裂が生じ易くなると共
に、この部分の第一の樹脂が凸状リブ(17)に食いつく
状態となって離型抵抗が増大し、成形後の型離れが悪く
なるという不具合があった。
However, in this conventional mold device, the convex rib (17) is provided at a position away from the secondary molding cavity (15) for molding the second resin, so that the second resin is injected. The pressure is indirectly received via the first resin, so that the first resin between the convex rib (17) and the secondary molding side cavity (15) has a resin pressure of the second resin. Therefore, deformation of the joint between the first resin and the second resin cannot be prevented, and a large internal strain occurs in the first resin due to the injection pressure of the second resin. Therefore, the first resin is liable to be cracked, and the first resin in this portion bites into the convex rib (17), so that the mold release resistance is increased and the mold separation after molding is deteriorated. There was a problem.

本発明は斯る点に鑑みて成されたもので、従来の二色
成形金型にさらに改良を加え、第二の樹脂の射出圧力に
よる影響をほぼ完全に除去することを目的とする。
The present invention has been made in view of the above points, and has as its object to further improve the conventional two-color molding die to almost completely eliminate the influence of the injection pressure of the second resin.

〔課題を解決するための手段〕[Means for solving the problem]

本発明は上述の目的を達成するために、 第一の樹脂を注入して一次成形を行ない、続いて第二
の樹脂を注入して二次成形を行なうようにした二色成形
金型装置において、 第一の樹脂による一次成形側のキャビティを形成する
金型の、第二の樹脂による二次成形側のキャビティと接
する端縁部に、 第二の樹脂の樹脂圧を直接的に受ける凸状部を設けて
なるものである。
In order to achieve the above object, the present invention provides a two-color molding die apparatus in which primary molding is performed by injecting a first resin, and then secondary molding is performed by injecting a second resin. An edge of the mold that forms the cavity on the primary molding side of the first resin, which is in contact with the cavity on the secondary molding side of the second resin, has a convex shape that directly receives the resin pressure of the second resin. Part is provided.

〔作用〕[Action]

このように一次成形側キャビティを形成する金型の凸
状部を設けたことにより、二次成形において第二の樹脂
を射出する際にその樹脂圧は凸状部によって直接的に受
けられて一次成形部の第一の樹脂に対する加圧力が緩和
される状態となり、このため一次成形側の第一の樹脂と
二次成形側の第二の樹脂との接合部には何ら変形が生じ
ることはなく、また一次成形側の内部歪も殆ど生じるこ
とはなく、外観性及び強度の優れた成形品が得られる。
By providing the convex portion of the mold that forms the primary molding side cavity, the resin pressure is directly received by the convex portion when the second resin is injected in the secondary molding. The pressure applied to the first resin of the molding portion is reduced, and therefore no deformation occurs at the joint between the first resin on the primary molding side and the second resin on the secondary molding side. Also, there is almost no internal distortion on the primary molding side, and a molded article excellent in appearance and strength can be obtained.

〔実施例〕〔Example〕

以下、第1図〜第4図を参照しながら本発明の実施例
について説明するに、上述した第5図〜第6図の従来例
と対応する部分には同一符号を付して詳細な説明は省略
する。
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. Parts corresponding to those of the conventional example shown in FIGS. 5 to 6 will be denoted by the same reference numerals and will be described in detail. Is omitted.

尚、本例においても、上述の従来例と同様に透明窓部
を有するテープカセットのシェルを成形する場合につい
て説明する。
In this embodiment, a case will be described in which a shell of a tape cassette having a transparent window is formed in the same manner as in the above-described conventional example.

本例の二色成形金型は第1図に示す如く、第一の樹脂
による一次成形、即ちカセットシェル(1)の本体部
(2)を成形するキャビティ(13)を上部固定金型(1
0)と合体して形成する下部固定金型(11)に、第二の
樹脂による二次成形、即ち透明窓部(3)を成形するキ
ャビティ(15)と接する端縁部の位置において凸状リブ
(17)を突設して成るものである。即ち、この凸状リブ
(17)は方形状の断面形状を成し、下部固定金形(12)
における可動金型(12)用摺動凹部(11a)の全周縁部
に沿って連続して形成されている。
As shown in FIG. 1, the two-color molding die of this embodiment is a primary molding using a first resin, that is, a cavity (13) for molding a main body (2) of a cassette shell (1) is fixed to an upper fixed die (1).
The lower fixed mold (11) formed by combining with the resin (0) is subjected to secondary molding with the second resin, that is, a convex shape at a position of an edge portion in contact with the cavity (15) for molding the transparent window (3). It is formed by projecting a rib (17). That is, the convex rib (17) has a square cross-sectional shape, and the lower fixed mold (12)
Are formed continuously along the entire periphery of the sliding recess (11a) for the movable mold (12).

そして、先ず同図Aの如く可動金型(12)を前進させ
て上部固定金型(10)の内面に密着させることにより形
成される一次成形側キャビティ(13)に、第一のゲート
(13a)から第一の樹脂として不透明な樹脂(14)を射
出注入してカセットシェルの本体部(2)を成形し(一
次成形)、その後この本体部(2)の半固化状態におい
て同図Bの如く可動金型(12)を後退移動させて二次成
形側キャビティ(15)を形成し、このキャビティ(15)
に第二のゲート(15a)から第二の樹脂として透明な樹
脂(16)を射出注入してカセットシェルの透明窓部
(3)を成形する(二次成形)。
First, as shown in FIG. A, the first gate (13a) is inserted into the primary molding side cavity (13) formed by advancing the movable mold (12) and bringing it into close contact with the inner surface of the upper fixed mold (10). ), An opaque resin (14) is injected and injected as a first resin to form a main body (2) of the cassette shell (primary molding), and then, in a semi-solid state of the main body (2), as shown in FIG. The movable mold (12) is moved backward to form the secondary molding side cavity (15), and the cavity (15)
Then, a transparent resin (16) as a second resin is injected and injected from the second gate (15a) to form a transparent window portion (3) of the cassette shell (secondary molding).

この二次成形においては、第2図に示す如く、第一の
樹脂としての不透明樹脂(14)側には、第二の樹脂とし
ての透明樹脂(16)の射出圧力aが加わることになる
が、この圧力aの一部は凸状リブ(17)によって直接的
に受けられる状態となり、このため不透明樹脂(14)側
に伝わる透明樹脂(16)の射出圧力は大幅に緩和される
ことになる。
In this secondary molding, as shown in FIG. 2, the injection pressure a of the transparent resin (16) as the second resin is applied to the opaque resin (14) as the first resin. A part of this pressure a is directly received by the convex rib (17), so that the injection pressure of the transparent resin (16) transmitted to the opaque resin (14) side is greatly reduced. .

従って、不透明樹脂(14)と透明樹脂(16)との接合
部の変形はほぼ完全に防止されると共に、不透明樹脂
(16)の内部歪が生じることは殆どない。
Therefore, the deformation of the joint between the opaque resin (14) and the transparent resin (16) is almost completely prevented, and the internal distortion of the opaque resin (16) hardly occurs.

そして、このようにして不透明樹脂(14)と透明樹脂
(16)とを一体に成形した後、上部固定金型(10)を下
部固定金型(11)から開いて成形品を取り出すことによ
り、第3図に示す如き、本体部(2)と透明窓部(3)
を一体に有するカセットシェル(1)が得られる。
Then, after the opaque resin (14) and the transparent resin (16) are integrally formed in this manner, the upper fixed mold (10) is opened from the lower fixed mold (11), and the molded product is taken out. As shown in FIG. 3, the main body (2) and the transparent window (3)
Is obtained integrally with the cassette shell (1).

この成形されたカセットシェル(1)には、本体部
(2)の裏面側に、凸状リブ(17)に対応した凹状の溝
部(4)が透明窓部(3)の全周縁に沿って形成され、
即ちこの部分は薄肉に形成されることになるが、この凹
状の溝部(4)はカセットシェル(1)の裏面側に形成
されるために、テープカセットの組立後の外観性には何
ら問題となることはなく、また内部に収納されるテープ
に干渉することはない。また、この凹状溝部(4)は、
カセットシェルの反りを防止するリブとして作用する効
果もある。
In the molded cassette shell (1), a concave groove (4) corresponding to the convex rib (17) is formed along the entire periphery of the transparent window (3) on the back side of the main body (2). Formed,
That is, this portion is formed to be thin, but since this concave groove (4) is formed on the back surface side of the cassette shell (1), there is no problem in the appearance of the tape cassette after assembly. It does not interfere with the tape stored inside. Also, this concave groove (4)
There is also an effect of acting as a rib for preventing the cassette shell from warping.

以上の如く本例の二色成形金型によれば、第一の樹脂
としての不透明樹脂(14)を成形する一次成形側キャビ
ティ(13)を形成する下部固定金型(11)に、二次成形
における第二の樹脂としての透明樹脂(16)の射出圧力
を直接的に受ける凸状リブ(17)を設けたことにより、
不透明樹脂(14)と透明樹脂(16)の接合部、即ちカセ
ットシェル(1)の透明窓部(3)の縁部の変形を略完
全に防止することができるので、カセットシェル(1)
の外観が損なわれることはない。また第一の樹脂として
の不透明樹脂(14)には内部歪が生じることはないの
で、不透明樹脂(14)に亀裂等が発生するおそれはなく
充分な強度が確保されると共に、不透明樹脂(14)が凸
状リブ(17)に食いつく状態となることはなく、成形品
即ちカセットシェルを金型から取り出す際にカセットシ
ェルは円滑に金型から離れ、簡単に取り出すことができ
る。
As described above, according to the two-color molding die of the present example, the secondary fixed die (11) forming the primary molding side cavity (13) for molding the opaque resin (14) as the first resin is By providing the convex rib (17) that directly receives the injection pressure of the transparent resin (16) as the second resin in molding,
Since the joint between the opaque resin (14) and the transparent resin (16), that is, the edge of the transparent window (3) of the cassette shell (1) can be almost completely prevented from deforming, the cassette shell (1)
Appearance is not impaired. Further, since the opaque resin (14) as the first resin does not have internal strain, there is no possibility that the opaque resin (14) is cracked or the like, and sufficient strength is secured. ) Does not bite into the convex ribs (17), and when removing the molded article, that is, the cassette shell from the mold, the cassette shell is smoothly separated from the mold and can be easily removed.

尚、以上の実施例においては、凸状リブ(17)は断面
方形状に形成してあるが、凸状リブを断面三角形状に形
成してもよい。この場合、凸状リブは第二の樹脂の射出
圧力を受ける側を垂直面とし、他側を傾斜面とするよう
に形成する。この場合は、凸状リブの傾斜面部が抜き勾
配として作用するので、成形後カセットシェルを金型か
ら一層取出し易くなるという利点がある。
In the above embodiment, the convex rib (17) is formed in a square cross section, but the convex rib may be formed in a triangular cross section. In this case, the convex rib is formed such that the side receiving the injection pressure of the second resin is a vertical surface and the other side is an inclined surface. In this case, since the inclined surface of the convex rib acts as a draft, there is an advantage that the cassette shell can be more easily removed from the mold after molding.

また、実施例においては、凸状リブ(17)をカセット
シェルの透明窓部(3)の全周縁に沿って連続的に形成
した場合について説明したが、これに限ることなく凸状
リブ(17)は所定長さで断続的に形成してもよい。
In the embodiment, the case where the convex rib (17) is formed continuously along the entire periphery of the transparent window portion (3) of the cassette shell has been described. However, the present invention is not limited to this. ) May be intermittently formed with a predetermined length.

また、実施例では下部固定金型(11)に凸状リブ(1
7)を設けた例を示したが、この凸状リブ(17)は上部
固定金型(10)に設けてもよい。この場合にも上述した
と同様の効果が得られるものであるが、この場合溝部
(4)はカセットシェル(1)の表面側に形成されるこ
とになる。
In the embodiment, the convex rib (1) is attached to the lower fixed mold (11).
Although the example in which 7) is provided is shown, the convex rib (17) may be provided in the upper fixed mold (10). In this case, the same effect as described above can be obtained, but in this case, the groove (4) is formed on the front side of the cassette shell (1).

さらに、この凸状リブ(17)に代えて、例えば凸状ピ
ンを所定間隔で並設して変形防止用凸状部としてもよ
い。
Further, instead of the convex ribs (17), for example, convex pins may be juxtaposed at predetermined intervals to form a convex portion for preventing deformation.

また、以上の実施例では、テープカセットのカセット
シェル(1)の成形に本発明の二色成形金型を用いた例
を示したが、本発明の二色成形金型はテープカセットに
限ることなく種々の樹脂成形品に適用できるものである
ことは勿論である。
Further, in the above embodiment, an example is shown in which the two-color molding die of the present invention is used for molding the cassette shell (1) of the tape cassette, but the two-color molding die of the present invention is limited to the tape cassette. Of course, it can be applied to various resin molded products.

〔発明の効果〕〔The invention's effect〕

以上の如く本発明の二色成形金型装置は、一次成形側
キャビティを形成する金型の、二次成形側キャビティと
接する端縁部に、第二の樹脂の樹脂圧を直接的に受け、
第一の樹脂への圧力を緩和する凸状部を設けたことによ
り、成形品における一次成形側の第一の樹脂と二次成形
側の第二の樹脂との接合部分の変形はほぼ完全に防止さ
れ、外観品質の優れた成形品を得ることができ、また一
次成形側の第一の樹脂には内部歪が生じることはないの
で、充分な強度が得られると共に成形後の成形品の離型
が円滑に行なわれる等、従来に比して一段と優れた実用
的効果を有する。
As described above, the two-color molding die apparatus of the present invention directly receives the resin pressure of the second resin on the edge of the die forming the primary molding side cavity, which is in contact with the secondary molding side cavity,
By providing the convex portion that relieves the pressure on the first resin, the deformation of the joint between the first resin on the primary molding side and the second resin on the secondary molding side in the molded product is almost completely It is possible to obtain a molded article with excellent appearance quality, and since there is no internal distortion in the first resin on the primary molding side, sufficient strength can be obtained and the molded article can be separated after molding. It has a much better practical effect than before, such as smooth molding.

【図面の簡単な説明】[Brief description of the drawings]

第1図は本発明の二色成形金型の断面図で、Aは一次成
形時、Bは二次成形時の状態、第2図は本発明の二色成
形金型の要部の断面図、第3図は本発明の二色成形金型
によって成形されたカセットシェルの斜視図、第4図は
第3図のA−A線断面図、第5図は従来の二色成形金型
によって成形されたカセットシェルの斜視図、第6図は
従来の二色成形金型の要部の断面図である。 図中、(10)は上部固定金型、(11)は下部固定金型、
(12)は可動金型、(13)は一次側キャビティ、(15)
は二次側キャビティ、(17)は凸状リブである。
FIG. 1 is a cross-sectional view of a two-color molding die of the present invention, where A is a state at the time of primary molding, B is a state at the time of secondary molding, and FIG. 2 is a cross-sectional view of a main part of the two-color molding die of the present invention. FIG. 3 is a perspective view of a cassette shell formed by the two-color molding die of the present invention, FIG. 4 is a sectional view taken along line AA of FIG. 3, and FIG. FIG. 6 is a perspective view of a molded cassette shell, and FIG. 6 is a sectional view of a main part of a conventional two-color molding die. In the figure, (10) is the upper fixed mold, (11) is the lower fixed mold,
(12) is movable mold, (13) is primary cavity, (15)
Is a secondary cavity, and (17) is a convex rib.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】第一の樹脂を注入して一次成形を行ない、
続いて第二の樹脂を注入して二次成形を行なうようにし
た二色成形金型装置において、 上記第一の樹脂による一次成形側のキャビティを形成す
る金型の、上記第二の樹脂による二次成形側のキャビテ
ィと接する端縁部に、 上記第二の樹脂の樹脂圧を直接的に受け、上記第一の樹
脂への圧力を緩和する凸状部を設けたことを特徴とする
二色成形金型装置。
A first molding is performed by injecting a first resin,
Subsequently, in a two-color molding die apparatus in which the second resin is injected to perform the secondary molding, the mold for forming the cavity on the primary molding side by the first resin is formed by the second resin. A convex portion for directly receiving the resin pressure of the second resin and relieving the pressure on the first resin is provided at an edge portion in contact with the cavity on the secondary molding side. Color molding die equipment.
JP63179621A 1988-07-19 1988-07-19 Two-color molding equipment Expired - Lifetime JP2707615B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63179621A JP2707615B2 (en) 1988-07-19 1988-07-19 Two-color molding equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63179621A JP2707615B2 (en) 1988-07-19 1988-07-19 Two-color molding equipment

Publications (2)

Publication Number Publication Date
JPH0229313A JPH0229313A (en) 1990-01-31
JP2707615B2 true JP2707615B2 (en) 1998-02-04

Family

ID=16068963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63179621A Expired - Lifetime JP2707615B2 (en) 1988-07-19 1988-07-19 Two-color molding equipment

Country Status (1)

Country Link
JP (1) JP2707615B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2557713B2 (en) * 1989-10-13 1996-11-27 富士写真フイルム株式会社 Injection mold
JP2676647B2 (en) * 1990-08-14 1997-11-17 富士写真フイルム株式会社 Magnetic tape cassette molding method and magnetic tape cassette

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029335B2 (en) * 1981-06-03 1985-07-10 松下電器産業株式会社 molding mold
JPS6246613A (en) * 1985-08-24 1987-02-28 Daiichi Kasei Kk Multicolor molded part
JPH0657417B2 (en) * 1985-11-15 1994-08-03 ティーディーケイ株式会社 Molding die

Also Published As

Publication number Publication date
JPH0229313A (en) 1990-01-31

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