JP3772302B2 - Two-color molding method and mold apparatus - Google Patents

Two-color molding method and mold apparatus Download PDF

Info

Publication number
JP3772302B2
JP3772302B2 JP2001289130A JP2001289130A JP3772302B2 JP 3772302 B2 JP3772302 B2 JP 3772302B2 JP 2001289130 A JP2001289130 A JP 2001289130A JP 2001289130 A JP2001289130 A JP 2001289130A JP 3772302 B2 JP3772302 B2 JP 3772302B2
Authority
JP
Japan
Prior art keywords
mold
resin
connection groove
molding
inner body
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
Application number
JP2001289130A
Other languages
Japanese (ja)
Other versions
JP2003094484A (en
Inventor
誠 中沢
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.)
Nissei Plastic Industrial Co Ltd
Original Assignee
Nissei Plastic Industrial Co Ltd
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 Nissei Plastic Industrial Co Ltd filed Critical Nissei Plastic Industrial Co Ltd
Priority to JP2001289130A priority Critical patent/JP3772302B2/en
Publication of JP2003094484A publication Critical patent/JP2003094484A/en
Application granted granted Critical
Publication of JP3772302B2 publication Critical patent/JP3772302B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/46—Knobs or handles, push-buttons, grips
    • B29L2031/466—Keypads, keytops

Description

【０００１】
【発明の属する技術分野】
この発明は、本体面内に文字や数字等の表示を有するキートップやナンバープレート等の二色成形品の成形方法と金型装置に関するものである。
【０００２】
【発明が解決しようとする課題】
二色成形方法では、上面に文字や数字等の表示部を部分的に突出成形した内側体を樹脂の射出により一次成形し、その内側体の上面に本体を形成する樹脂を射出により二次成形して、本体表面に表示部の上面を露出させ、これにより本体面内に文字や数字等の表示を有する二色成形品、たとえばキートップやナンバープレート、表示プレート等を成形している。
【０００３】
この二色成形方法では、面内表示の形態を明確にするために、表示体と一体の内側体とその上面を被覆する本体は異色の樹脂により成形されるが、内側体側を透明樹脂により成形し、本体側を遮光性を有する不透明樹脂により成形して、面内表示を内部の光源により照光表示する製品をも成形することができる。
【０００４】
また表示体がＡ、Ｂ、Ｏ、Ｐ等の英文字や４、６、８、９等の数字で全体的に囲繞された形態であっても、囲繞部を形成する表示体の内外部位に一対のゲート孔を穿設し、その両ゲート孔の接続溝を内側体の下面に設けることで成形を行うことができるが、接続溝に生じた成形品裏側の樹脂ブリッジを成形後にゲートカットする必要がある。従来ではアンダーカットにより樹脂ブリッジを可動型のコア型内に固定し、離型時の成形品の突出力を利用してゲートカットを行っているため、アンダーカットが浅いと樹脂ブリッジが成形品と共に抜け出してゲートカットが行えず、また深いと樹脂ブリッジをコア型内から突出し難くなるなどの課題を有する。
【０００５】
この発明の目的は、成形品裏面の上記樹脂ブリッジのゲートカットを、それ自体の回転により行うことによって、ゲートカットの確実化を図ると共に、金型の樹脂ブリッジを形成する部位の構造を簡素化することができる新たな二色成形方法と金型装置とを提供することにある。
【０００６】
【課題を解決するための手段】
上記目的によるこの発明の二色成形方法は、囲繞部を有する形態の文字や数字等の表示体を成形する型面と、その囲繞部を形成する表示体の型面の内外部位にゲート孔用の一対の突部を有する内側体成形用のキャビティを備えた第一固定型と、上記一対の突部にわたり先端部を接離自在に臨ませた接続溝形成ピンを中央部に後退自在に有する回転ロッドと、その回転ロッドの先端面をコア型面と面一に位置させて、該回転ロッドを回転自在に内部に備えた可動型とにより、上記表示体が上面に部分的に突設し、かつ囲繞部を形成する表示体の内外部位に一対のゲート孔が穿設された内側体を樹脂の射出により一次成形し、その一次成形後に上記接続溝形成ピンを後退して、内側体の下面とピン先端面との間に一対のゲート孔にわたる樹脂の接続溝を形成したのち、第二固定型と可動型とにより内側体の上面に異色の樹脂を表示体と面一に射出して囲繞部内まで本体を二次成形し、その本体と共に接続溝に生じた樹脂ブリッジを、成形品の離型前に回転ロッド及び接続溝形成ピンと一緒に回転して、該樹脂ブリッジのゲートカットと成形品裏面からの切り離しを行い、樹脂ブリッジの排除を切り離し後の接続溝形成ピンの戻しにより行う、というものである。
【０００７】
またこの発明の二色成形方法は、囲繞部を有する形態の文字や数字等の表示体を成形する型面と、その囲繞部を形成する表示体の型面の内外部位にゲート孔用の一対の突部を有する内側体成形用のキャビティを備えた第一固定型と、
上記一対の突部にわたり先端部を接離自在に臨ませた接続溝形成ピンを中央部に後退自在に有する回転ロッドと、その回転ロッドの先端面をコア型面と面一に位置させて、該回転ロッドを回転自在に内部に備えた可動型とにより、上記表示体が上面に部分的に突設し、かつ囲繞部を形成する表示体の内外部位に一対のゲート孔が穿設された内側体を、照光表示が可能な透明樹脂の射出により一次成形し、その一次成形後に上記接続溝形成ピンを後退移動して、内側体の下面とピン先端面との間に一対のゲート孔にわたる樹脂の接続溝を形成したのち、第二固定型と可動型とにより内側体の上面に不透明樹脂を表示体と面一に射出して囲繞部内まで本体を二次成形し、その本体と共に接続溝に生じた樹脂ブリッジを、成形品の離型前に回転ロッド及び接続溝形成ピンと一緒に回転して、該樹脂ブリッジのゲートカットと成形品裏面からの切り離しを行い、樹脂ブリッジの排除を切り離し後の接続溝形成ピンの戻しにより行う、というものである。
【０００８】
この発明の二色成形金型装置は、囲繞部を有する形態の文字や数字等の表示体を成形する型面と、その囲繞部を形成する表示体の型面の内外部位にゲート孔用の一対の突部を有する内側体成形用のキャビティを備えた第一固定型と、その内側体をキャビティの型面として、表示体を除く内側体の上面に本体を成形するキャビティを備えた第二固定型と、上記第一固定型と型閉して内側体の下面を成形する一方、内側体と共に第二固定型と型閉して内側体上面に本体を成形するコア型を備えた可動型と、その可動型の内部に回動自在に設けて先端面をコア型面と面一に位置させたゲートカット用の回転ロッド及びその回転手段と、その回転ロッドの中央部に嵌挿して板状の先端部を上記一対の突部にわたり接離自在に臨ませ、後退により樹脂の接続溝をピン先端面に形成する接続溝形成ピンと、その接続溝形成ピンの回転ロッドから突出した後端と連結した突出板とからなる、というものである。
【０００９】
【発明の実施の形態】
図中１は一次成形用の第一固定型、２は可動型、３は二次成形用の第二固定型で、図では省略したが可動型２は通常の回転手段又はスライド移動手段等により両固定型１，３と交互に型閉じする構造からなる。
【００１０】
上記第一固定型１は、キートップの内側体を成形するキャビティ１１を備え、そのキャビティ１１は、囲繞部を有する形態の文字や数字等の表示体（例えば英文字Ａ）を成形する型面１２と、その囲繞部を形成する表示体の型面１２ａの内外部位にゲート孔用の一対の突部１３，１３を有する。
【００１１】
上記可動型２は、上記第一固定型１と型閉して内側体の下面を成形する一方、図６に示すように、内側体の上面に本体を成形するキャビティ３１を備えた第二固定型３と型閉して、内側体上面に本体を成形するコア型２１を備えている。この可動型２の内部には先端面をコア型面と面一に位置させた回転ロッド２２が回動自在に設けてあり、その回転ロッド２２の中央部には軸部の先端部２３ａを板状に形成した接続溝形成ピン２３が、先端部２３ａを上記一対の突部１３，１３にわたり接離自在に臨ませて嵌挿してある。
【００１２】
この接続溝形成ピン２３の回転ロッド２２から突出した軸部後端はフランジ２３ｂに形成され、そのフランジ２３ｂを可動型２の後部内の空所２４に進退自在に設けた突出板２５に挟持して、その突出板２５と共に接続溝形成ピン２３が回転ロッド内を後退移動するように連結してある。また回転ロッド２２の後端部は周囲に設けた歯車２６と共に、空所２４の前部内に固定したギアボックス２７に収容してあり、その内部のラック２８と支持歯車２９とに歯車２６を噛合して、該ラック２８により回転ロッド２２が接続溝形成ピン２３と一緒に９０°回転するようにしてある。
【００１３】
上記金型装置を用いて図８に示すキートップ等の二色成形品４を射出成形するには、先ず図４に示すように、第一固定型１と、回転ロッド２２と接続溝成形ピン２３の先端面をコア型面と面一に位置させた可動型２とを型閉して、内側体４１のキャビティ１１を形成する。次にキャビティ１１に側部のゲート１２から樹脂をキャビティ１１に射出充填して、表示体４２が上面に部分的に突設した内側体４１を一次成形する。
【００１４】
このような内側体４１を成形したのち可動型２の型開を行うと、図５に示すように、内側体４１はコア型２１に付着して可動型２に残り、またキャビティ１１に突出した一対の上記突部１３，１３によるゲート孔４４，４４が、表示体４２の囲繞部４３内と、その囲繞部４３を形成する表示体４２ａの外側の対向部位にに生ずるようになる。
【００１５】
この型開後に可動型２を内側体４１と共に上記第二固定型３に移動して型閉じを行うと、表示体４２が型面に接するところまで、内側体４１が第二固定型３に内包されてキャビティ３１の片側の型面を形成する。そこで接続溝形成ピン２３を上記突出板２５により後退して回転ロッド２２内に引っ込め、内側体４１の下面と先端面との間に一対のゲート孔４４，４４にわたる樹脂の接続溝５を形成したのち、側部のゲート３２からキャビティ３１に異色の樹脂を射出充填する。
【００１６】
樹脂は表示体４２の外側のキャビティ３１を満たし、さらにゲート孔４４、接続溝５、ゲート孔４４から囲繞部４３内に充填されて、そこに表示体と面一の本体４５が囲繞部内まで内側体４１の上面に一体的に二次成形された二色成形品４が成形されるようになる。この本体４５の二次成形後に上記回転ロッド２２をラック２８により９０°回転すると、図８に示すように、接続溝５に生じた成形品裏面の樹脂ブリッジ５１も回転ロッド２２と一緒に回転してゲートカットが行われ、樹脂ブリッジ５１が成形品裏面から切り離される。
【００１７】
このゲートカット後に可動型２と第二固定型３の型開を行うと、図では省略するが、二色成形品４はコア型２１に付着したままキャビティ３１から引き出されて可動型２に残る。そこで図示しない他の通常の突出手段により二色成形品４の離型を行う。成形品から切り離された樹脂ブリッジ５１は、図９に示すように、そのまま回転ロッド２２の先端内に残るが、次に接続溝成形ピン２３を突出板２５により前進移動して元のコア先端面まで戻すと、それにより樹脂ブリッジ５１が突き出されて回転ロッドの先端内から排除される。
【００１８】
この樹脂ブリッジ５１の回転によるゲートカットは、保圧又は冷却工程、場合によって第二固定型３の型開工程と平行して行うことができるが、樹脂が固化する前に行うのが最も好ましい。
また表示体４２と一体の内側体４１を形成する樹脂と、本体４５を形成する樹脂は異色の樹脂が採用されるが、内側体側を透明樹脂とし、本体側を不透明樹脂とした場合には、本体面内に照光表示が可能な表示体を有する二次成形品を上記と同様な成形手段により成形することができる。
さらに金型装置として、樹脂ブリッジを固定するアンダーカットが不要となるのでコア型内の構造が簡素化され、樹脂ブリッジのゲートカットも常に確実に行われるようになる。
【図面の簡単な説明】
【図１】 この発明に係わる二色成形方法に用いられる金型装置の縦断正面図である。
【図２】 可動型の平面図である。
【図３】 金型装置の縦断側面図である。
【図４】 内側体の成形状態を示す縦断正面図及び縦断側面図である。
【図５】 内側体の離型状態を示す縦断正面図及び縦断側面図である。
【図６】 可動型と第二固定型の型閉状態を示す縦断正面図及び縦断側面図である。
【図７】 本体成形時の縦断正面図である。
【図８】 樹脂ブリッジのゲートカット状態を示す縦断正面図である。
【図９】 二色成形品の離型状態を示す縦断正面図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a molding method of a two-color molded product such as a key top or a license plate having a display of characters, numbers, etc. in a main body surface, and a mold apparatus.
[0002]
[Problems to be solved by the invention]
In the two-color molding method, the inner body, in which the display parts such as letters and numbers are partly projected and molded on the upper surface, is primary molded by resin injection, and the resin that forms the main body on the upper surface of the inner body is secondarily molded by injection. Then, the upper surface of the display unit is exposed on the surface of the main body, thereby forming a two-color molded product having a display of characters, numbers, etc., for example, a key top, a license plate, a display plate, and the like.
[0003]
In this two-color molding method, in order to clarify the form of in-plane display, the inner body integrated with the display body and the main body covering the upper surface are molded with a different color resin, but the inner body side is molded with a transparent resin. In addition, a product in which the main body side is molded with an opaque resin having a light shielding property and the in-plane display is illuminated by an internal light source can be molded.
[0004]
In addition, even if the display body is entirely surrounded by English letters such as A, B, O, P, or numbers such as 4, 6, 8, 9, etc., the display body is positioned inside and outside the display body forming the surrounding portion. Molding can be performed by drilling a pair of gate holes and providing a connecting groove for both gate holes on the lower surface of the inner body. After molding the resin bridge on the back side of the molded product, the gate is cut after molding. There is a need. Conventionally, the resin bridge is fixed in the movable core mold by undercutting, and gate cutting is performed by using the projecting output of the molded product at the time of mold release. The gate cannot be cut out by being pulled out, and if it is deep, there are problems such that it becomes difficult to protrude the resin bridge from the core mold.
[0005]
The purpose of this invention is to make the gate cut of the resin bridge on the back of the molded product by rotating itself, thereby ensuring the gate cut and simplifying the structure of the part forming the resin bridge of the mold An object of the present invention is to provide a new two-color molding method and mold apparatus that can be used.
[0006]
[Means for Solving the Problems]
The two-color molding method of the present invention according to the above object is provided for a gate hole at a mold surface for molding a display body such as letters and numbers in a form having an encircling portion, and inside and outside of the mold surface of the display body forming the encircling portion a first stationary die having a cavity for the inner body molding having a pair of projections of freely retracted in central portion connection groove forming pin to face the tip freely separable over the pair of projections a rotary rod having its distal end surface of the rotating rod is positioned in the core mold surface and flush with a movable mold having the interior for rotation the rotating rod, partially projecting the display body to the upper surface The inner body having a pair of gate holes formed in the inner and outer positions of the display body forming the surrounding portion is primarily molded by injection of resin, and after the primary molding, the connection groove forming pin is retracted to form the inner body. Resin contact across a pair of gate holes between the bottom surface of the pin and the pin tip surface After forming the groove, the second fixed mold and the movable mold inject different color resin on the upper surface of the inner body flush with the display body, and the main body is secondarily formed into the surrounding part, and it is generated in the connection groove together with the main body The resin bridge is rotated together with the rotating rod and connection groove forming pin before releasing the molded product, and then the resin bridge is cut from the gate and separated from the back of the molded product, and the resin bridge is removed and then connected. It is performed by returning the groove forming pin.
[0007]
The two-color molding method of the present invention also includes a mold surface for molding a display body such as characters and numbers having a surrounding portion, and a pair of gate holes on the inside and outside of the mold surface of the display body forming the surrounding portion. A first fixed mold having a cavity for molding an inner body having a protrusion of
A rotating rod with the retractable into Chuo portion connection groove forming pin to face the tip freely separable over the pair of projections, by positioning the distal end surface of the rotating rod core mold surface flush The display body partially protrudes from the upper surface, and a pair of gate holes are formed at the inner and outer positions of the display body forming the surrounding portion by the movable type having the rotating rod rotatably provided therein. The inner body is subjected to primary molding by injection of a transparent resin capable of illumination display, and after the primary molding, the connection groove forming pin is moved backward to form a pair of gate holes between the lower surface of the inner body and the pin tip surface. After forming the resin connection groove, the second fixed mold and the movable mold inject opaque resin on the upper surface of the inner body flush with the display body, and the body is secondarily molded into the surrounding part, and connected with the body The resin bridge formed in the groove is locked before the molded product is released. And rotates together with the connecting groove formed pin performs detach from the molded article back surface and gate cutting of the resin bridge, performed by the return of the connection groove forming pins after disconnecting the elimination of the resin bridge, is that.
[0008]
The two-color molding die apparatus of the present invention has a mold surface for molding a display body such as letters and numbers in a form having a surrounding portion, and gate holes for the inner and outer positions of the mold surface of the display body forming the surrounding portion. A first fixed mold having a cavity for molding an inner body having a pair of protrusions, and a second mold having a cavity for molding the main body on the upper surface of the inner body excluding the display body, using the inner body as a mold surface of the cavity. A movable mold having a fixed mold and a core mold that molds the lower surface of the inner body by closing the mold with the first fixed mold and molds the main body on the upper surface of the inner body by closing the mold with the second fixed mold together with the inner body. And a rotary rod for gate cut that is rotatably provided inside the movable die and whose tip surface is flush with the core die surface, its rotating means, and a plate fitted into the central portion of the rotary rod. The tip of the shape faces the above-mentioned pair of protrusions so as to be able to come into contact with and separate from each other. Consists of a connecting groove forming pin for forming a connection groove on the pin tip surface, and the projecting plate in conjunction with a rear end projecting from the rotating rod of the connecting groove forming pins, is that.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, 1 is a first fixed mold for primary molding, 2 is a movable mold, 3 is a second fixed mold for secondary molding, and although not shown in the figure, the movable mold 2 is provided by a normal rotating means or slide moving means. The fixed molds 1 and 3 are alternately closed.
[0010]
The first fixed mold 1 includes a cavity 11 for molding an inner body of a key top, and the cavity 11 is a mold surface for molding a display body (for example, an English letter A) such as letters and numbers having a surrounding portion. 12 and a pair of projections 13 and 13 for gate holes on the inside and outside of the mold surface 12a of the display body forming the surrounding portion.
[0011]
The movable mold 2 is closed with the first fixed mold 1 to mold the lower surface of the inner body, and, as shown in FIG. 6, a second fixed having a cavity 31 for molding the main body on the upper surface of the inner body. A core mold 21 for closing the mold 3 and molding the main body on the upper surface of the inner body is provided. A rotary rod 22 having a tip end surface flush with the core mold surface is rotatably provided inside the movable die 2, and a tip end portion 23 a of a shaft portion is provided at the center of the rotary rod 22. A connecting groove forming pin 23 formed in a shape is fitted and inserted with the tip 23a facing the pair of protrusions 13 and 13 so as to be able to contact and separate.
[0012]
The rear end of the shaft portion protruding from the rotating rod 22 of the connection groove forming pin 23 is formed in a flange 23b, and the flange 23b is sandwiched by a protruding plate 25 provided in a space 24 in the rear portion of the movable mold 2 so as to be movable back and forth. Thus, the connecting groove forming pin 23 is coupled with the protruding plate 25 so as to move backward in the rotating rod. The rear end portion of the rotating rod 22 is housed in a gear box 27 fixed in the front portion of the cavity 24 together with a gear 26 provided in the periphery, and the gear 26 is meshed with a rack 28 and a support gear 29 therein. The rotating rod 22 is rotated 90 ° together with the connection groove forming pin 23 by the rack 28.
[0013]
In order to injection-mold the two-color molded product 4 such as the key top shown in FIG. 8 using the mold apparatus, first, as shown in FIG. 4, the first fixed mold 1, the rotating rod 22, and the connecting groove forming pin. The cavity 11 of the inner body 41 is formed by closing the movable die 2 in which the distal end surface of 23 is positioned flush with the core die surface. Next, resin is injected and filled into the cavity 11 from the side gate 12 to the cavity 11, and the inner body 41 with the display body 42 partially protruding on the upper surface is primarily molded.
[0014]
When the movable mold 2 is opened after the inner body 41 is formed, the inner body 41 adheres to the core mold 21 and remains on the movable mold 2 and protrudes into the cavity 11 as shown in FIG. Gate holes 44, 44 formed by the pair of protrusions 13, 13 are formed in the surrounding portion 43 of the display body 42 and in the opposing portion outside the display body 42 a forming the surrounding portion 43.
[0015]
After the mold is opened, when the movable mold 2 is moved to the second fixed mold 3 together with the inner body 41 and the mold is closed, the inner body 41 is contained in the second fixed mold 3 until the display body 42 comes into contact with the mold surface. Thus, a mold surface on one side of the cavity 31 is formed. Therefore, the connecting groove forming pin 23 is retracted by the protruding plate 25 and retracted into the rotating rod 22 to form a resin connecting groove 5 across a pair of gate holes 44, 44 between the lower surface and the front end surface of the inner body 41. After that, different color resin is injected and filled from the side gate 32 into the cavity 31.
[0016]
The resin fills the cavity 31 outside the display body 42 and is further filled into the surrounding portion 43 from the gate hole 44, the connection groove 5, and the gate hole 44, and the main body 45 flush with the display body is inside the surrounding portion. The two-color molded product 4 integrally molded on the upper surface of the body 41 is molded. When the rotating rod 22 is rotated 90 ° by the rack 28 after the secondary molding of the main body 45, the resin bridge 51 on the back surface of the molded product generated in the connection groove 5 also rotates together with the rotating rod 22 as shown in FIG. Then, gate cutting is performed, and the resin bridge 51 is separated from the back surface of the molded product.
[0017]
If the movable mold 2 and the second fixed mold 3 are opened after the gate cut, the two-color molded product 4 is pulled out of the cavity 31 while remaining attached to the core mold 21 and remains in the movable mold 2 although not shown in the figure. . Therefore, the two-color molded product 4 is released by other normal projecting means (not shown). As shown in FIG. 9, the resin bridge 51 cut off from the molded product remains in the tip of the rotating rod 22 as it is, but then the connecting groove forming pin 23 is moved forward by the protruding plate 25 to return to the original core tip surface. When the pressure is returned, the resin bridge 51 is protruded and removed from the tip of the rotating rod.
[0018]
The gate cut by the rotation of the resin bridge 51 can be performed in parallel with the pressure holding or cooling process, and in some cases, the mold opening process of the second fixed mold 3, but is most preferably performed before the resin is solidified.
The resin forming the inner body 41 integrated with the display body 42 and the resin forming the main body 45 are different colored resins, but when the inner body side is a transparent resin and the main body side is an opaque resin, A secondary molded product having a display body capable of illuminating display in the main body surface can be molded by molding means similar to the above.
Further, since the undercut for fixing the resin bridge is not required as the mold apparatus, the structure in the core mold is simplified, and the gate cut of the resin bridge is always performed reliably.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a mold apparatus used in a two-color molding method according to the present invention.
FIG. 2 is a plan view of a movable type.
FIG. 3 is a vertical side view of the mold apparatus.
FIG. 4 is a longitudinal front view and a longitudinal side view showing a molded state of the inner body.
FIG. 5 is a longitudinal front view and a longitudinal side view showing a releasing state of the inner body.
FIGS. 6A and 6B are a longitudinal front view and a longitudinal side view showing a mold closed state of a movable mold and a second fixed mold. FIGS.
FIG. 7 is a longitudinal front view of the body molding.
FIG. 8 is a longitudinal sectional front view showing a gate cut state of a resin bridge.
FIG. 9 is a longitudinal sectional front view showing a release state of a two-color molded product.

Claims (3)

囲繞部を有する形態の文字や数字等の表示体を成形する型面と、その囲繞部を形成する表示体の型面の内外部位にゲート孔用の一対の突部を有する内側体成形用のキャビティを備えた第一固定型と、
上記一対の突部にわたり先端部を接離自在に臨ませた接続溝形成ピンを中央部に後退自在に有する回転ロッドと、
その回転ロッドの先端面をコア型面と面一に位置させて、該回転ロッドを回転自在に内部に備えた可動型とにより、
上記表示体が上面に部分的に突設し、かつ囲繞部を形成する表示体の内外部位に一対のゲート孔が穿設された内側体を樹脂の射出により一次成形し、
その一次成形後に上記接続溝形成ピンを後退して、内側体の下面とピン先端面との間に一対のゲート孔にわたる樹脂の接続溝を形成したのち、
第二固定型と可動型とにより内側体の上面に異色の樹脂を表示体と面一に射出して囲繞部内まで本体を二次成形し、
その本体と共に接続溝に生じた樹脂ブリッジを、成形品の離型前に回転ロッド及び接続溝形成ピンと一緒に回転して、該樹脂ブリッジのゲートカットと成形品裏面からの切り離しを行い、
樹脂ブリッジの排除を切り離し後の接続溝形成ピンの戻しにより行うことを特徴とする二色成形方法。For molding an inner body having a mold surface for molding a display body such as letters and numbers having a surrounding portion, and a pair of protrusions for a gate hole at the inner and outer positions of the mold surface of the display body forming the surrounding portion. A first fixed mold with a cavity;
A rotating rod with the retractable into Chuo portion connection groove forming pin to face the tip freely separable over the pair of protrusions,
With the movable rod having the rotating rod provided rotatably inside, with the tip surface of the rotating rod positioned flush with the core mold surface,
The display body is partly projected on the upper surface, and an inner body having a pair of gate holes formed at the inner and outer positions of the display body forming the surrounding portion is primarily molded by resin injection,
After the primary molding, the connection groove forming pin is retracted to form a resin connection groove over a pair of gate holes between the lower surface of the inner body and the pin tip surface,
The second fixed mold and the movable mold inject a different color resin on the upper surface of the inner body flush with the display body, and secondarily mold the main body into the surrounding area,
The resin bridge generated in the connection groove together with the main body is rotated together with the rotating rod and the connection groove forming pin before releasing the molded product, and the resin bridge is cut from the gate cut and the molded product rear surface,
A two-color molding method characterized in that removal of the resin bridge is performed by returning the connection groove forming pin after separation. 囲繞部を有する形態の文字や数字等の表示体を成形する型面と、その囲繞部を形成する表示体の型面の内外部位にゲート孔用の一対の突部を有する内側体成形用のキャビティを備えた第一固定型と、
上記一対の突部にわたり先端部を接離自在に臨ませた接続溝形成ピンを中央部に後退自在に有する回転ロッドと、
その回転ロッドの先端面をコア型面と面一に位置させて、該回転ロッドを回転自在に内部に備えた可動型とにより、
上記表示体が上面に部分的に突設し、かつ囲繞部を形成する表示体の内外部位に一対のゲート孔が穿設された内側体を、照光表示が可能な透明樹脂の射出により一次成形し、
その一次成形後に上記接続溝形成ピンを後退移動して、内側体の下面とピン先端面との間に一対のゲート孔にわたる樹脂の接続溝を形成したのち、
第二固定型と可動型とにより内側体の上面に不透明樹脂を表示体と面一に射出して囲繞部内まで本体を二次成形し、
その本体と共に接続溝に生じた樹脂ブリッジを、成形品の離型前に回転ロッド及び接続溝形成ピンと一緒に回転して、該樹脂ブリッジのゲートカットと成形品裏面からの切り離しを行い、
樹脂ブリッジの排除を切り離し後の接続溝形成ピンの戻しにより行うことを特徴とする二色成形方法。For molding an inner body having a mold surface for molding a display body such as letters and numbers having a surrounding portion, and a pair of protrusions for a gate hole at the inner and outer positions of the mold surface of the display body forming the surrounding portion. A first fixed mold with a cavity;
A rotating rod with the retractable into Chuo portion connection groove forming pin to face the tip freely separable over the pair of protrusions,
With the movable rod having the rotating rod provided rotatably inside, with the tip surface of the rotating rod positioned flush with the core mold surface,
The inner body in which the display body partially protrudes from the upper surface and a pair of gate holes are formed in the inner and outer positions of the display body forming the surrounding portion is primarily molded by injection of a transparent resin capable of illumination display. And
After the primary molding, the connection groove forming pin is moved backward to form a resin connection groove across a pair of gate holes between the lower surface of the inner body and the pin tip surface,
The second fixed mold and the movable mold are used to inject the opaque resin on the upper surface of the inner body flush with the display body to secondary-mold the main body into the surrounding area,
The resin bridge generated in the connection groove together with the main body is rotated together with the rotating rod and the connection groove forming pin before releasing the molded product, and the resin bridge is cut from the gate cut and the molded product rear surface,
A two-color molding method characterized in that removal of the resin bridge is performed by returning the connection groove forming pin after separation. 囲繞部を有する形態の文字や数字等の表示体を成形する型面と、その囲繞部を形成する表示体の型面の内外部位にゲート孔用の一対の突部を有する内側体成形用のキャビティを備えた第一固定型と、
その内側体をキャビティの型面として、表示体を除く内側体の上面に本体を成形するキャビティを備えた第二固定型と、
上記第一固定型と型閉して内側体の下面を成形する一方、内側体と共に第二固定型と型閉して内側体上面に本体を成形するコア型を備えた可動型と、
その可動型の内部に回動自在に設けて先端面をコア型面と面一に位置させたゲートカット用の回転ロッド及びその回転手段と、
その回転ロッドの中央部に嵌挿して板状の先端部を上記一対の突部にわたり接離自在に臨ませ、後退により樹脂の接続溝をピン先端面に形成する接続溝形成ピンと、
その接続溝形成ピンの回転ロッドから突出した後端と連結した突出板とからなることを特徴とするる二色金型装置。For molding an inner body having a mold surface for molding a display body such as letters and numbers having a surrounding portion, and a pair of protrusions for a gate hole at the inner and outer positions of the mold surface of the display body forming the surrounding portion. A first fixed mold with a cavity;
With the inner body as the mold surface of the cavity, a second fixed mold having a cavity for molding the main body on the upper surface of the inner body excluding the display body,
While the mold is closed with the first fixed mold to form the lower surface of the inner body, a movable mold having a core mold that molds the main body on the upper surface of the inner body by closing the second fixed mold together with the inner body;
A rotary rod for gate cut in which the tip end surface is positioned flush with the core mold surface, and its rotating means, provided rotatably inside the movable mold;
A connecting groove forming pin that is inserted into the center portion of the rotating rod and faces the plate-like tip portion detachably over the pair of protrusions, and a resin connecting groove is formed on the pin tip surface by retreating;
A two-color mold apparatus comprising a protruding plate connected to a rear end protruding from a rotating rod of the connection groove forming pin.
JP2001289130A 2001-09-21 2001-09-21 Two-color molding method and mold apparatus Expired - Fee Related JP3772302B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001289130A JP3772302B2 (en) 2001-09-21 2001-09-21 Two-color molding method and mold apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001289130A JP3772302B2 (en) 2001-09-21 2001-09-21 Two-color molding method and mold apparatus

Publications (2)

Publication Number Publication Date
JP2003094484A JP2003094484A (en) 2003-04-03
JP3772302B2 true JP3772302B2 (en) 2006-05-10

Family

ID=19111671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001289130A Expired - Fee Related JP3772302B2 (en) 2001-09-21 2001-09-21 Two-color molding method and mold apparatus

Country Status (1)

Country Link
JP (1) JP3772302B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102267216A (en) * 2008-09-18 2011-12-07 鸿利达塑胶制品有限公司 Forming method of three-color scissors
CN111438864A (en) * 2020-04-02 2020-07-24 常州市新创智能科技有限公司 Automatic demoulding system for I-shaped stringer

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005319624A (en) * 2004-05-07 2005-11-17 Hakubun:Kk Graver
ITTO20070393A1 (en) * 2007-06-06 2008-12-07 Bitron Spa EQUIPMENT FOR THE MOLDING OF PLASTIC MATERIALS.
JP5498034B2 (en) * 2009-03-03 2014-05-21 忠頼 寺内 Resin molded product manufacturing method, resin molded product, resin molded product unit
CN104859100A (en) * 2015-05-27 2015-08-26 天津三卓韩一精密塑胶科技有限公司 Manufacturing die and manufacturing technology for novel key identification
JP6820069B1 (en) * 2019-07-26 2021-01-27 Ｎｅｃプラットフォームズ株式会社 Molds and methods for manufacturing molded products using dies

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102267216A (en) * 2008-09-18 2011-12-07 鸿利达塑胶制品有限公司 Forming method of three-color scissors
CN102267216B (en) * 2008-09-18 2013-11-27 鸿利达塑胶制品有限公司 Forming method of three-color scissors
CN111438864A (en) * 2020-04-02 2020-07-24 常州市新创智能科技有限公司 Automatic demoulding system for I-shaped stringer

Also Published As

Publication number Publication date
JP2003094484A (en) 2003-04-03

Similar Documents

Publication Publication Date Title
US4990077A (en) Injection mold
US3671621A (en) Injection molding method for sandals
US20080012179A1 (en) Housing of an electronic device formed by doubleshot injection molding
JP3772302B2 (en) Two-color molding method and mold apparatus
JPWO2004018178A1 (en) Combined product mold and molding method thereof
GB2273456A (en) Providing a smooth transition between the relatively rotatable parts of a blow- out vent
JPH08197578A (en) Method and apparatus for molding composite molded product
JPH02111513A (en) Two-color injection mold
JPS59109332A (en) Method for molding synthetic resin container
JPH03292116A (en) Molding method of resin molded product and mold
JP2712673B2 (en) Injection mold
JP2003170469A (en) Mold for injection molding
JPS6274615A (en) Manufacture of molded body of different materials
JP3302042B2 (en) Inner diameter undercut processing type for cylindrical molded products
JP2625554B2 (en) Two-color molding method
KR102351605B1 (en) In-Mold Label Injection Device that can Insert a Label inside the Product
JP7407322B1 (en) Molding molds and molding methods for molded products
JP2004291324A (en) Mold for multicolor molding and multicolor molding method
JP2005007713A (en) Method for demolding plastic molding and mold
JP2712728B2 (en) Cassette half molding method and cassette half molding die
US11840002B1 (en) Donut tooling mold structure and method
JP2007021964A (en) Injection molding mold
JPH07119026B2 (en) Primary molding product and method for producing two-color molding product using the same
JP2929808B2 (en) Tape container and mold for molding the same
JP2881554B2 (en) Injection molding equipment

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040628

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040803

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20041004

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050830

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20051027

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20060110

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20060202

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090224

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120224

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120224

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150224

Year of fee payment: 9

LAPS Cancellation because of no payment of annual fees