JP2959084B2 - Mold for in-mold coating - Google Patents
Mold for in-mold coatingInfo
- Publication number
- JP2959084B2 JP2959084B2 JP24543690A JP24543690A JP2959084B2 JP 2959084 B2 JP2959084 B2 JP 2959084B2 JP 24543690 A JP24543690 A JP 24543690A JP 24543690 A JP24543690 A JP 24543690A JP 2959084 B2 JP2959084 B2 JP 2959084B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- paint
- cavity
- molten resin
- coating
- 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
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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1679—Making multilayered or multicoloured articles applying surface layers onto injection-moulded substrates inside the mould cavity, e.g. in-mould coating [IMC]
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C2045/1687—Making multilayered or multicoloured articles preventing leakage of second injected material from the mould cavity
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、プラスチックの射出成形におけるインモー
ルドコーティングに使用する金型に関するものである。Description: TECHNICAL FIELD The present invention relates to a mold used for in-mold coating in plastic injection molding.
シートモールディングコンパウンド（以下SMCとい
う）を圧縮成形して得られる成形品の表面には、ピンホ
ールと呼ばれる微細な穴やリブ及びボスの裏面に発生す
るひけ等の欠陥が生ずる。このピンホールやひけの対策
の一つとしてインモールドコーティング法（以下IMCと
いう）がある。On the surface of a molded product obtained by compression-molding a sheet molding compound (hereinafter referred to as SMC), fine holes called pinholes and defects such as sink marks generated on the back surface of ribs and bosses are generated. One of the measures against pinholes and sink marks is the in-mold coating method (hereinafter referred to as IMC).
IMCは、プラスチックの成形と同時に塗装する方法
で、一般的にはSMC成形において行われているが、最近
では射出成形においても行われるようになった。IMC is a method of coating simultaneously with the molding of plastics, which is generally performed in SMC molding, but has recently been performed in injection molding.
射出成形におけるIMCは、第２図及び第５図に示すよ
うに、固定型１にキャビテイ1Aを形成し、可動型２との
パーテング面３に形成した溶融樹脂射出口1Bから溶融樹
脂をキャビテイ1A内に射出して充填し、この溶融樹脂が
初期硬化した段階で可動型２を数ミリメートル開け、塗
料注入孔４からIMC塗料を型内に注入し、可動型２を加
圧して規定時間保持し、塗料を硬化させてから型開きし
て成形品を取り出すようにしている。As shown in FIGS. 2 and 5, the IMC in the injection molding forms the cavity 1A in the fixed mold 1 and transfers the molten resin from the molten resin injection port 1B formed in the parting surface 3 with the movable mold 2 through the cavity 1A. When the molten resin is initially cured, the movable mold 2 is opened several millimeters, IMC paint is injected into the mold through the paint injection hole 4, and the movable mold 2 is pressurized and held for a specified time. After the paint is cured, the mold is opened and the molded product is taken out.
特開昭61−248709号公報には、SMC成形に使用するIMC
用金型が記載されており、また、実開昭62−166012号公
報には、SMC真空成形時に型内を真空に保持するための
シール部材を設けたSMC圧縮成形型が提案されている。JP-A-61-248709 discloses an IMC used for SMC molding.
Japanese Patent Application Laid-Open No. Sho 62-166012 discloses an SMC compression molding die provided with a seal member for keeping the inside of the die at a vacuum during SMC vacuum molding.
前記SMCのIMCでは、成形の途中で僅かに型開きしてIM
C塗料を注入するときに、金型のキャビテイの周囲に上
下金型の嵌合摺動面があるので、特別の対策を必要とし
ない。ところが射出成形では、第２図に示すように固定
型１と可動型２をパーテング面３で突き合わせた状態で
溶融樹脂をキャビテイ内に射出するものであり、また、
金型のパーテング面３に溶融樹脂の射出口1Bがあるの
で、可動型２を僅かに開いて金型内に注入された塗料７
が、第５図に示すように注入圧力及び可動型２の加圧に
より、パーテング面３に沿って漏れる問題が生ずる。In the SMC IMC, the mold is opened slightly during
When injecting C paint, there is no special countermeasure because the upper and lower molds have fitting sliding surfaces around the mold cavities. However, in the injection molding, as shown in FIG. 2, the molten resin is injected into the cavity in a state where the fixed mold 1 and the movable mold 2 are abutted on the parting surface 3.
Since the molten resin injection port 1B is provided on the parting surface 3 of the mold, the movable mold 2 is slightly opened to open the paint 7 injected into the mold.
However, as shown in FIG. 5, there arises a problem that leakage occurs along the parting surface 3 due to the injection pressure and the pressurization of the movable mold 2.
本発明は、金型のパーテング面にシール部材を配設す
ることにより、上記の課題を解決するインモールドコー
ティング用金型を提供することを目的としたものであ
る。An object of the present invention is to provide a mold for in-mold coating that solves the above-mentioned problems by disposing a seal member on a parting surface of the mold.
本発明は、分割型でキャビテイを形成し、これら両型
のパーテング面に溶融樹脂射出口を設けた射出成形金型
において、前記分割型の一方に塗料の注入口とキャビテ
イの外周部を取り巻くパーテング面にシーリングリング
とを配設したインモールドコーティング用金型である。The present invention is directed to an injection molding mold in which a cavity is formed by a split mold and a molten resin injection port is provided on a parting surface of the two molds, wherein one of the split molds has a paint injection port and a part surrounding an outer peripheral portion of the cavity. This is a mold for in-mold coating in which a sealing ring is disposed on a surface.
金型を型締めして溶融樹脂射出口から溶融樹脂をキャ
ビテイ内に射出して充填し、溶融樹脂が初期硬化した段
階で金型を僅かの距離たけ開くと、シーリングリングが
金型のパーテング面におけるキャビテイの外周部及び溶
融樹脂射出口に形成された硬化樹脂上面に当接する。The mold is clamped, the molten resin is injected into the cavity from the molten resin injection port, and the cavity is filled.When the molten resin is initially hardened, the mold is opened a short distance, and the sealing ring is moved to the parting surface of the mold. At the outer periphery of the cavity and the upper surface of the cured resin formed at the molten resin injection port.
次に、塗料注入口から型内に塗料を注入して加圧する
と、型内に注入された塗料は、シーリングリングでシー
ルされて硬化した樹脂成形品の表面部だけを覆って金型
の外部に漏れない。所定時間この状態に保持して塗料を
硬化させてから型開きして成形品を取り出す。Next, the paint is injected into the mold from the paint inlet and pressurized, the paint injected into the mold is sealed with a sealing ring, and covers only the surface of the cured resin molded product, and is outside the mold. Not leak. After holding the coating in this state for a predetermined period of time to cure the paint, the mold is opened and the molded product is taken out.
本発明の実施例を図面について説明する。 An embodiment of the invention will be described with reference to the drawings.
第１図はIMC時の成形金型を示す断面図であり、第２
図は射出成形前の成形金型を示す断面図である。FIG. 1 is a sectional view showing a molding die at the time of IMC, and FIG.
The figure is a sectional view showing a molding die before injection molding.
分割型の固定型１と可動型２の間に成形品に対応した
形状のキャビテイ1Aが形成され、固定型１と可動型２を
パーテング面３で突き合わせた状態として型締めする。
溶融樹脂をキャビテイ内に射出する溶融樹脂射出口1Bが
パーテング面３に設けられている。A cavity 1A having a shape corresponding to the molded product is formed between the fixed mold 1 and the movable mold 2 of the split mold, and the fixed mold 1 and the movable mold 2 are clamped in a state where the fixed mold 1 and the movable mold 2 abut on the parting surface 3.
A molten resin injection port 1 </ b> B for injecting the molten resin into the cavity is provided on the parting surface 3.
可動型２に塗料の注入口４を形成し、キャビテイ1Aの
外周部を取り巻くパーテング面３の可動型２側に形成し
た凹部に耐熱ゴム又は耐熱樹脂製のシーリングリング５
を配設する。A paint inlet 4 is formed in the movable mold 2, and a sealing ring 5 made of heat-resistant rubber or resin is formed in a recess formed on the movable mold 2 side of the parting surface 3 surrounding the outer periphery of the cavity 1 </ b> A.
Is arranged.
可動型２に配設するシーリングリング５は、第３図に
示すように、可動型２の凹部に金属製のリング８をバネ
９で摺動可能に設置しても良い。As shown in FIG. 3, the sealing ring 5 provided on the movable die 2 may be provided with a metal ring 8 slidably mounted by a spring 9 in a concave portion of the movable die 2.
次に、この金型を用いたIMC成形方法を第４図を参照
して説明する。Next, an IMC molding method using this mold will be described with reference to FIG.
第２図に示す固定型１と可動型２をパーテング面３で
付き合わせて型締めした状態とし、第４図（Ａ）に示す
ように溶融樹脂射出口1Bから溶融樹脂をキャビテイ1A内
に射出し、第４図（Ｂ）に示すように溶融樹脂６をキャ
ビテイ1A内に充填し、この状態で規定時間保持する。The fixed mold 1 and the movable mold 2 shown in FIG. 2 are brought together in a state where they are brought together by the parting surface 3 and clamped, and the molten resin is injected into the cavity 1A from the molten resin injection port 1B as shown in FIG. 4 (A). Then, as shown in FIG. 4 (B), the molten resin 6 is filled in the cavity 1A, and is maintained in this state for a specified time.
キャビテイ1A内の溶融樹脂６が初期硬化した段階で可
動型２を僅かの距離ｔだけ開く、このｔは樹脂成形品の
表面に形成する塗膜の厚さに相当する距離とする。第４
図（Ｃ）に示すように、固定型１に押し付けられていた
シーリングリング５が弾性変形し、固定型１のキャビテ
イ1Aの外周部及び溶融樹脂射出口1Bの硬化した樹脂６の
上面に当接する。When the molten resin 6 in the cavity 1A is initially cured, the movable mold 2 is opened by a small distance t, where t is a distance corresponding to the thickness of the coating film formed on the surface of the resin molded product. 4th
As shown in FIG. 1C, the sealing ring 5 pressed against the fixed mold 1 is elastically deformed and comes into contact with the outer peripheral portion of the cavity 1A of the fixed mold 1 and the upper surface of the cured resin 6 at the molten resin injection port 1B. .
次に、第４図（Ｄ）の矢印で示すように、塗料注入口
４からIMC塗料７を注入し、可動型２を加圧する。注入
された塗料７は、第４図（Ｅ）に示すように周囲をシー
リングリング５で密封されるので、樹脂成形品６の表面
部だけを覆って金型の外部には漏れない。所定時間この
状態に保持して塗料を硬化させた後、第４図（Ｆ）に示
すように型開きして成形品を取り出す。Next, as shown by an arrow in FIG. 4 (D), the IMC paint 7 is injected from the paint inlet 4 and the movable mold 2 is pressurized. The injected paint 7 is hermetically sealed by the sealing ring 5 as shown in FIG. 4 (E), so that it covers only the surface of the resin molded product 6 and does not leak outside the mold. After holding the coating in this state for a predetermined time to cure the paint, the mold is opened and the molded product is taken out as shown in FIG. 4 (F).
このように、金型に注入された塗料は、加圧されても
キャビテイ内に射出された樹脂の表面のみを流動し、塗
料の無駄がないと共に、樹脂成形品の表面に良好な塗装
面が安定して得られる。In this way, the paint injected into the mold flows only on the surface of the resin injected into the cavity even if it is pressurized, and there is no waste of the paint, and a good painted surface is formed on the surface of the resin molded product. Obtained stably.
本発明は、プラスチックの射出成形と同一の金型を使
用してインモールドコーティングする場合に、塗料の無
駄がないと共に、樹脂成形品の表面に良好な塗装面が安
定して得られる効果が有る。INDUSTRIAL APPLICABILITY The present invention has an effect that, when performing in-mold coating using the same mold as plastic injection molding, there is no waste of paint and a good painted surface can be stably obtained on the surface of the resin molded product. .
第１図はIMC時の成形金型を示す断面図、第２図は射出
成形前の成形金型を示す断面図、第３図はシーリングリ
ングの別の実施例の断面図、第４図（Ａ）ないし（Ｆ）
は本発明のIMC工程を示す図、第５図は従来のIMC金型を
示す図である。 1:固定型、1B:溶融樹脂射出口 2:可動型、3:パーテング面 4:塗料注入口、5:シーリングリング 6:成形樹脂、7:IMC塗料1 is a cross-sectional view showing a molding die at the time of IMC, FIG. 2 is a cross-sectional view showing a molding die before injection molding, FIG. 3 is a cross-sectional view of another embodiment of the sealing ring, FIG. A) or (F)
Is a view showing an IMC process of the present invention, and FIG. 5 is a view showing a conventional IMC mold. 1: fixed type, 1B: molten resin injection port 2: movable type, 3: parting surface 4: paint inlet, 5: sealing ring 6: molding resin, 7: IMC paint
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中川 栄一 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (72)発明者 山下 徳郎 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (72)発明者 田中 洋祐 神奈川県藤沢市土棚８番地 株式会社い すゞ中央研究所内 (56)参考文献 特開 平３−106625（ＪＰ，Ａ) 特開 平２−187313（ＪＰ，Ａ) 実開 平３−57018（ＪＰ，Ｕ) 実開 平３−52114（ＪＰ，Ｕ) 実開 昭63−124114（ＪＰ，Ｕ) 実開 昭62−94810（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00 - 45/84 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Eiichi Nakagawa, Edo Tsurana, Fujisawa City, Kanagawa Prefecture Inside Isuzu Central Research Laboratories (72) Inventor Tokuro Yamashita 8, Tsuchiya, Fujisawa City, Kanagawa Prefecture Isuzu Central Research Inc. In-house (72) Inventor Yosuke Tanaka No. 8 Tsuchina, Fujisawa-shi, Kanagawa Inside Isuzu Central Research Institute Co., Ltd. (56) References JP-A-3-106625 (JP, A) JP-A-2-187313 (JP, A) Japanese Utility Model 357018 (JP, U) Japanese Utility Model 3 52114 (JP, U) Japanese Utility Model 63-124114 (JP, U) Japanese Utility Model 62-94810 (JP, U) (58) (Int.Cl. 6 , DB name) B29C 45/00-45/84
Claims (1)
のパーテング面に溶融樹脂射出口を設けた射出成形金型
において、前記分割型の一方に塗料の注入口とキャビテ
イの外周部を取り巻くパーテング面にシーリングリング
とを配設したことを特徴とするインモールドコーティン
グ用金型。1. An injection molding die having a cavity formed by a split mold and a molten resin injection port provided on a parting surface of both molds, wherein one of the split molds surrounds a paint injection port and an outer peripheral portion of the cavity. A mold for in-mold coating, wherein a sealing ring is provided on a parting surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24543690A JP2959084B2 (en) | 1990-09-14 | 1990-09-14 | Mold for in-mold coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24543690A JP2959084B2 (en) | 1990-09-14 | 1990-09-14 | Mold for in-mold coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04125118A JPH04125118A (en) | 1992-04-24 |
| JP2959084B2 true JP2959084B2 (en) | 1999-10-06 |
Family
ID=17133636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24543690A Expired - Lifetime JP2959084B2 (en) | 1990-09-14 | 1990-09-14 | Mold for in-mold coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2959084B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2134306T3 (en) * | 1993-11-05 | 1999-10-01 | Battenfeld Gmbh | PROCEDURE AND DEVICE FOR CASTING BY INJECTION OF MULTILAYER ARTICLES. |
| FR2729886B1 (en) * | 1995-01-31 | 1997-04-25 | Peugeot | PROCESS FOR PRODUCING A COATING ON A SURFACE OF A PLASTIC PART AND THE USE THEREOF |
| DE69904544T2 (en) * | 1998-09-03 | 2003-10-02 | Technologie Michelin Clermont | Shape for flat treads |
| EP0983833B1 (en) * | 1998-09-03 | 2002-11-27 | Pneu Laurent | Mould for flat treads of tires |
| KR20030007539A (en) * | 2000-04-20 | 2003-01-23 | 데코마 익스테리어 트림 인크. | Method of molding a panel |
| EP1321269A1 (en) * | 2001-12-19 | 2003-06-25 | Sony Ericsson Mobile Communications AB | Method for providing a lacquered plastics part and plastic part provided by the method |
| CN114536796B (en) * | 2022-03-22 | 2022-10-18 | 宁波卡奔密封科技有限公司 | Treatment process of bar for sealing element production |
-
1990
- 1990-09-14 JP JP24543690A patent/JP2959084B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04125118A (en) | 1992-04-24 |
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