JPH04329112A - In-mold coating method of plastic - Google Patents
In-mold coating method of plasticInfo
- Publication number
- JPH04329112A JPH04329112A JP12666291A JP12666291A JPH04329112A JP H04329112 A JPH04329112 A JP H04329112A JP 12666291 A JP12666291 A JP 12666291A JP 12666291 A JP12666291 A JP 12666291A JP H04329112 A JPH04329112 A JP H04329112A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- pressure
- molding
- paint
- imc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 16
- 239000004033 plastic Substances 0.000 title claims abstract description 14
- 229920003023 plastic Polymers 0.000 title claims abstract description 14
- 239000003973 paint Substances 0.000 claims abstract description 46
- 238000000465 moulding Methods 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 238000005266 casting Methods 0.000 abstract 2
- 230000001815 facial effect Effects 0.000 abstract 1
- 239000004412 Bulk moulding compound Substances 0.000 description 23
- 239000000463 material Substances 0.000 description 19
- 239000011248 coating agent Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000003677 Sheet moulding compound Substances 0.000 description 7
- MSBLMBWXUVQCDY-UHFFFAOYSA-N 1-(4,4-dimethyl-1-piperazin-4-iumyl)ethanone Chemical compound CC(=O)N1CC[N+](C)(C)CC1 MSBLMBWXUVQCDY-UHFFFAOYSA-N 0.000 description 6
- 101000988793 Homo sapiens Host cell factor C1 regulator 1 Proteins 0.000 description 6
- 101000613207 Homo sapiens Pre-B-cell leukemia transcription factor-interacting protein 1 Proteins 0.000 description 6
- 102100029105 Host cell factor C1 regulator 1 Human genes 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 210000003660 reticulum Anatomy 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
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
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、プラスチックのインモ
−ルドコ−ティング法、特に、バルクモ−ルディングコ
ンパウンド成形品のインモ−ルドコ−ティング法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for in-mold coating of plastics, and more particularly to a method for in-mold coating of bulk molding compound articles.
【０００２】0002
【従来の技術】近時、自動車の外板として実用されるよ
うになったＦＲＰ（ガラス繊維強化樹脂）の代表的な成
形品である、シ−トモ−ルデイングコンパウント゛（以
下ＳＭＣという）を圧縮成形して得られる成形品には、
ヒケやピンホ−ルが発生する。ＳＭＣ成形品の表面に発
生するピンホ−ル対策の一つとしてインモ−ルドコ−テ
ィング法（以下ＩＭＣという）がある。このＩＭＣは、
プラスチックの成形と同時に塗装する方法で、本出願人
は、先にプラスチックのインモ−ルドコ−ティング法の
発明について特許出願（特願平１−８１０４７号、特開
平２−２５８３１９号及び特願平１−１８１７７８号、
特開平３−４７７１９号））している。[Prior Art] Sheet molding compound (hereinafter referred to as SMC), which is a typical molded product of FRP (glass fiber reinforced resin), which has recently come into practical use as the outer panel of automobiles, is compressed. The molded product obtained by molding includes
Sinks and pinholes occur. In-mold coating (hereinafter referred to as IMC) is one of the measures against pinholes that occur on the surface of SMC molded products. This IMC is
The present applicant previously filed patent applications for the invention of the in-mold coating method for plastics (Japanese Patent Application No. 1-81047, JP-A No. 2-258319, and Japanese Patent Application No. 2-258319). -181778,
JP-A No. 3-47719)).
【０００３】ＩＭＣは、プラスチックの成形と同時に塗
装する方法で、ＩＭＣ材料である塗料を型内へ注入する
方法として次の２通りの方法がある。従来は、調温した
金型の下型にＳＭＣ材料を置いて上型を閉じ、成形圧力
を上げて規定時間保持してＳＭＣ材料を硬化させ、型を
数ミリメ−トル開けて塗料を型内に注入し、次に型を閉
じて規定時間保持し、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。この従来のＩＭＣは
、成形の途中で型開きしなければならないため、金型内
に異物が混入したり、成形サイクルの時間が長くなる等
の問題がある。[0003] IMC is a method of painting plastic at the same time as molding, and there are two methods for injecting the paint, which is the IMC material, into the mold. Conventionally, SMC material was placed in the lower mold of a temperature-controlled mold, the upper mold was closed, the molding pressure was increased and held for a specified time to harden the SMC material, and the mold was opened a few millimeters to allow the paint to enter the mold. The mold is then closed and held for a specified period of time to allow the paint to harden before the mold is opened and the molded product is removed. In this conventional IMC, the mold must be opened during molding, which causes problems such as foreign matter getting into the mold and lengthening of the molding cycle.
【０００４】現在は、ハイプレッシャ−インジェクショ
ンプロセス（以下ＨＰＩＰという）の方へ技術開発が進
んでいる。このＨＰＩＰは、１４０〜１５０℃に温度調
節された金型の下型にＳＭＣ材料を置き、上型を閉めて
圧力を掛けて規定時間硬化させる。次に、圧力を少し下
げた状態で塗料を３００Ｋｇ／ｃｍ２程度の高圧で閉じ
たままの金型内に注入し、塗料の注入を停止した後に圧
力を上げて所定時間保持して塗料を硬化させるものであ
る。[0004]Currently, technological development is progressing toward a high pressure injection process (hereinafter referred to as HPIP). In this HPIP, the SMC material is placed in the lower mold of a mold whose temperature is controlled at 140 to 150° C., the upper mold is closed, pressure is applied, and the material is cured for a specified period of time. Next, the paint is injected into the closed mold at a high pressure of about 300 kg/cm2 with the pressure slightly lowered, and after stopping the injection of paint, the pressure is increased and held for a predetermined time to harden the paint. It is something.
【０００５】ＳＭＣ材料と類似の材料にバルクモ−ルデ
イングコンパウンド（以下ＢＭＣという）がある。この
ＢＭＣは、ガラス繊維のチョップトストランドに硬化剤
及び縮合剤を配合した不飽和ポリエステル樹脂を混入又
は含浸させ、更にこれをゲル化させた成形材料で、主と
してトランスファ−成形、射出成形、射出−圧縮成形等
の方法により成形される。ＢＭＣのこれらの成形法では
、従来ＩＭＣ，ＨＰＩＰによる成形品の表面品質の改善
を行なうことができなかった。その理由は次のとおりで
ある。A material similar to SMC material is bulk molding compound (hereinafter referred to as BMC). BMC is a molding material made by mixing or impregnating chopped glass fiber strands with an unsaturated polyester resin containing a curing agent and a condensing agent, and then gelling this, and is mainly used in transfer molding, injection molding, and injection molding. Molded by compression molding or other methods. With these BMC molding methods, it has not been possible to improve the surface quality of molded products by conventional IMC and HPIP. The reason is as follows.
【０００６】例えば、図４に示す分割式の成形金型３，
４を用い、スプル５からＢＭＣ材料を型内に射出して自
動車用のボンネットを成形する場合、成形金型の当接面
であるパ−ティング面１８が平面のつき当てとなってい
るため、塗料注入口６からＩＭＣ，ＨＰＩＰ塗料を高圧
で注入した際に、金型のキャビティからパ−ティング面
１８を経て塗料が流れ出してしまい、成形品１の表面に
は、図５に示すようにＩＭＣショ−トと呼ばれる未塗装
部１２ができてしまう。また、表面積の大きなボンネッ
トのような部品の場合は、金型内に空気溜りができて、
図６に示すようにＩＭＣショ−ト１３が発生する。For example, a split molding die 3 shown in FIG.
4 is used to inject BMC material from the sprue 5 into a mold to mold an automobile bonnet, since the parting surface 18, which is the contact surface of the molding die, is a flat abutment, When IMC and HPIP paints are injected at high pressure from the paint injection port 6, the paint flows out from the mold cavity through the parting surface 18, and the IMC and HPIP paints flow out from the mold cavity onto the surface of the molded product 1 as shown in FIG. An unpainted portion 12 called a short is created. Also, in the case of parts such as bonnets with large surface areas, air pockets may form inside the mold.
As shown in FIG. 6, an IMC short 13 occurs.
【０００７】また、ＨＰＩＰでは、型開きせずに高圧で
塗料を注入するため、ＩＭＣショ−トが発生するだけで
なく、注入のタイミングを誤ると、塗料が未硬化のＢＭ
Ｃ材を通り製品の裏側へ回り込んだり、図７に示すよう
に製品のタブ２付近だけに塗膜１４が形成されたりする
。[0007] Furthermore, in HPIP, the paint is injected under high pressure without opening the mold, which not only causes IMC short-circuits, but also causes damage to uncured BM if the timing of injection is incorrect.
The coating film 14 may pass through the C material and go around to the back side of the product, or the coating film 14 may be formed only near the tab 2 of the product as shown in FIG.
【０００８】[0008]
【発明が解決しようとする課題】以上のとおり、ＢＭＣ
を使用して射出成形した成形品に発生した、ヒケやピン
ホ−ル等の表面品質の不良は、従来、成形後に手作業で
修正せざるを得ず、生産性が悪いとともに、パテによっ
て修正した製品の表面品質にも問題が残る。[Problem to be solved by the invention] As mentioned above, BMC
In the past, defects in surface quality such as sink marks and pinholes that occurred in molded products injection molded using molding methods had to be corrected manually after molding, resulting in poor productivity and the need to correct them with putty. Problems also remain with the surface quality of the product.
【０００９】本発明は、上記の課題を解決し、ＢＭＣを
用いた成形においてＩＭＣショ−トを無くし、成形品の
表面品質を良好に、かつ能率良く成形するインモ−ルド
コ−ティング法を提供することを目的とする。The present invention solves the above problems and provides an in-mold coating method that eliminates IMC shorts in molding using BMC, improves the surface quality of molded products, and molds efficiently. The purpose is to
【００１０】0010
【課題を解決するための手段】本発明は、成形品の形状
部の周縁に喰切りを形成した金型のプラスチック注入口
の近傍に圧力センサ−を設置し、該金型にプラスチック
を注入して成形する際、前記圧力センサ−が型内のプラ
スチックの発熱膨張によるピ−ク圧力を過ぎ所定の圧力
降下を検出した時点で成形の圧力を抜き、真空脱気した
型内に塗料を高圧で注入し、次いで成形の圧力を上げて
注入した塗料を型内に流動させ、その後塗料を硬化させ
るプラスチックのインモ−ルドコ−ティング法である。[Means for Solving the Problems] In the present invention, a pressure sensor is installed near a plastic injection port of a mold in which a cutout is formed on the periphery of a shaped part of a molded product, and plastic is injected into the mold. During molding, when the pressure sensor detects a predetermined pressure drop after passing the peak pressure caused by the heat-generating expansion of the plastic in the mold, the molding pressure is released and the paint is applied at high pressure into the vacuum-degassed mold. This is an in-mold coating method for plastics, in which the molding pressure is increased to cause the injected paint to flow into the mold, and then the paint is cured.
【００１１】[0011]
【作用】塗料を型内に高圧で注入する際、圧力センサ−
で型内の成形品の反応状態を検知してそのタイミングを
決め、予め型内を真空脱気するので、型内に高圧で注入
された塗料は、金型の喰切りで外部への流出が止められ
、型内に注入された塗料は成形品の表面を完全に覆い、
ＩＭＣショ−トが発生しない。[Operation] When injecting paint into the mold at high pressure, the pressure sensor
The reaction state of the molded product inside the mold is detected and the timing is determined, and the inside of the mold is vacuum degassed in advance, so the paint injected into the mold at high pressure will not leak out when the mold is cut open. The paint is stopped and injected into the mold, completely covering the surface of the molded product.
IMC short does not occur.
【００１２】0012
【実施例】本発明の実施例を図面を参照して説明する。
図１は、自動車のボンネットの成形金型を示す断面図、
図２は成形品を示す平面図、図３は金型の一部の拡大断
面図である。成形品１には、塗料の注入口となるタブ２
を形成する。このタブ２付きの成形品１を成形する金型
は、図１に示すように、分割式の固定型３と上型４の間
に成形品に対応した形状のキャビテイを形成し、固定型
３にＢＭＣを射出するスプル５を設け、上型４のタブ２
に対応する部位に塗料の注入口６を設け、固定型３と上
型４の当接面は、図３に示すように、喰切り（カットオ
フ）７と平らなパ−ティング面８で形成する。喰切り７
とパ−ティング面８との間に真空ポンプに接続される真
空脱気口１０に連なる通路が設けられ、その周りにシ−
ル材１１が設けられている。固定型３のスプル５の近く
に圧力センサ−９を配設する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a mold for forming an automobile hood;
FIG. 2 is a plan view showing the molded product, and FIG. 3 is an enlarged sectional view of a part of the mold. Molded product 1 has a tab 2 that serves as a paint injection port.
form. As shown in FIG. 1, the mold for molding the molded product 1 with the tab 2 has a cavity with a shape corresponding to the molded product formed between the split-type fixed mold 3 and the upper mold 4, and the fixed mold 3 A sprue 5 for injecting BMC is installed on the tab 2 of the upper mold 4.
A paint injection port 6 is provided at a location corresponding to the above, and the contact surface between the fixed mold 3 and the upper mold 4 is formed by a cut-off 7 and a flat parting surface 8, as shown in FIG. do. Kikiri 7
A passage leading to a vacuum deaeration port 10 connected to a vacuum pump is provided between the parting surface 8 and the parting surface 8, and a seal is provided around the passage.
A material 11 is provided. A pressure sensor 9 is disposed near the sprue 5 of the fixed mold 3.
【００１３】次に、図１に示す金型を用いたＢＭＣのＩ
ＭＣの概要について説明する。固定型３に上型４をセッ
トすると、金型のキャビィ周縁は喰切り７で密閉され、
型締め圧力は、その周りの平らなパ−ティング面８で受
けられる。１４０〜１７０℃に温度調節した金型に、１
０〜１５０Ｋｇ／ｃｍ２の圧力でＢＭＣをスプル５から
キャビティへ射出する。その状態で０．５分ないし〜３
分間保持してＢＭＣ材料を硬化させる。ＢＭＣ材料が硬
化した後、真空脱気口１０から金型内の空気を排出し、
次に、塗料注入口６からＩＭＣ塗料を高圧で注入し、規
定時間その状態に保持して塗料を硬化させる。塗料の注
入前に金型を閉じたままで金型内を排気するので、塗料
を注入したときに金型内に空気溜りができず、また、金
型に注入された塗料は、喰切り７により流失が防止され
る。金型から取り出した成形品は、ＢＭＣ成形品の表面
に厚さ７０〜１００μのＩＭＣ塗膜が強固に接着し、Ｂ
ＭＣで成形品の表面に発生したピンホ−ルは、ＩＭＣ塗
料で埋められてその表面は平滑なものとなる。Next, BMC I using the mold shown in FIG.
An overview of MC will be explained. When the upper mold 4 is set on the fixed mold 3, the periphery of the mold cavity is sealed with the cutout 7.
The clamping pressure is taken up by the flat parting surface 8 around it. 1 in a mold whose temperature is adjusted to 140-170℃.
BMC is injected from the sprue 5 into the cavity at a pressure of 0 to 150 Kg/cm2. Stay in that state for 0.5 minutes or ~3
Hold for a minute to cure the BMC material. After the BMC material has hardened, the air in the mold is exhausted from the vacuum deaeration port 10,
Next, the IMC paint is injected at high pressure from the paint injection port 6 and held in that state for a specified period of time to cure the paint. Before injecting the paint, the inside of the mold is evacuated while the mold is closed, so there is no air pocket inside the mold when the paint is injected, and the paint injected into the mold is removed by the cutout 7. Wash-off is prevented. The molded product taken out from the mold has an IMC coating film with a thickness of 70 to 100μ firmly adhered to the surface of the BMC molded product.
The pinholes generated on the surface of the molded product by MC are filled with IMC paint, making the surface smooth.
【００１４】次に、ＢＭＣのＩＭＣの詳細を説明する。
１４０〜１７０℃に温度調節した金型に、ＢＭＣをスプ
ル５からキャビティへ射出し、１００〜２００Ｋｇ／ｃ
ｍ２の成形圧力を図９に示すように規定時間Ｔ１保持す
る。このＴ１時間は、後に説明するように、金型内のＢ
ＭＣ材料が発熱膨張のピ−クを過ぎて硬化収縮段階に入
る時間とする。次にプレスの圧力を抜き、成形圧力を掛
けずに閉じた状態に保持した型内を矢印Ｖで示すように
真空脱気する。次に、矢印Ｉで示すように、塗料注入タ
ブの位置にある注入口からＩＭＣ塗料を３００Ｋｇ／ｃ
ｍ２位の高圧で注入し、塗料の注入後に成形圧力を再び
１００〜２００Ｋｇ／ｃｍ２に上げ、Ｔ３時間この状態
に保持して塗料を硬化させる。Next, details of IMC of BMC will be explained. BMC is injected into the cavity from the sprue 5 into a mold whose temperature is adjusted to 140 to 170°C, and 100 to 200 kg/c
A molding pressure of m2 is maintained for a specified time T1 as shown in FIG. As will be explained later, this T1 time is
This is the time when the MC material passes the peak of exothermic expansion and enters the hardening contraction stage. Next, the pressure of the press is released, and the inside of the mold, which is held in a closed state without applying molding pressure, is vacuum degassed as shown by arrow V. Next, as shown by arrow I, apply 300 kg/c of IMC paint from the injection port located at the position of the paint injection tab.
After injection of the paint, the molding pressure is increased again to 100 to 200 kg/cm2, and this state is maintained for T3 hours to harden the paint.
【００１５】前記のＴ１時間の設定は、次のようにして
決定する。図９は樹脂圧力モニタ測定図で、金型内に封
入されたＢＭＣ材料は、発熱膨張して矢印■に示すよう
に圧力が上昇し、ｔ１時間経過後にピ−ク圧力に到達し
、次いで矢印■で示すように収縮段階に入り、金型内圧
力が降下する。この圧力の変化を固定型３に設置した圧
力センサ−９で測定する。この圧力曲線に予めスレッシ
ュホ−ルド圧■を設定する。ＢＭＣの成形時に圧力セン
サ−９の検出値がスレッシュホ−ルド圧■以上となり、
ピ−ク圧力に到達した時点ｔ１で真空脱気装置に信号を
送り、図８のＶで示すように金型内の脱気を開始する。
次に圧力センサ−がスレッシュホ−ルド圧■を検出した
時点ｔ２でプレス側に信号を送って成形圧力を抜き、型
を閉じた状態を保持し、次にプレス側からの信号で図８
のＩで示すようにＩＭＣ材料を金型内に高圧で注入する
。The setting of the T1 time mentioned above is determined as follows. Fig. 9 is a resin pressure monitor measurement diagram, in which the BMC material sealed in the mold expands due to heat generation, and the pressure rises as shown by the arrow ■, reaches the peak pressure after t1 time, and then As shown in (2), the mold enters the contraction stage and the pressure inside the mold decreases. This change in pressure is measured by a pressure sensor 9 installed on the fixed mold 3. A threshold pressure (2) is set in advance on this pressure curve. During BMC molding, the detection value of pressure sensor 9 exceeds the threshold pressure ■,
At the time t1 when the peak pressure is reached, a signal is sent to the vacuum deaerator to start degassing the inside of the mold as shown by V in FIG. Next, at the time t2 when the pressure sensor detects the threshold pressure ■, a signal is sent to the press side to release the molding pressure and keep the mold closed, and then a signal is sent from the press side as shown in Figure 8.
The IMC material is injected into the mold at high pressure as shown by I in FIG.
【００１６】このように、成形の圧力を抜き、金型をと
じたままで金型内を排気し、塗料を注入したときには金
型内のＢＭＣ材料が収縮段階に入っているので空気溜り
ができず、塗料がＢＭＣの表面を良く流動し、ＩＭＣシ
ョ−トが発生しない。また、金型に注入された塗料は、
その後の成形圧力の上昇により硬化したＢＭＣの表面に
更に流動し、良好な塗装が安定して得られる。[0016] In this way, when the molding pressure is released, the inside of the mold is evacuated with the mold closed, and the paint is injected, the BMC material inside the mold is in the contraction stage, so no air pockets are formed. , the paint flows well on the BMC surface, and IMC shorts do not occur. In addition, the paint injected into the mold is
As the molding pressure increases thereafter, the resin flows further onto the surface of the hardened BMC, and a good coating can be stably obtained.
【００１７】圧力センサ−９の設置場所は、ＢＭＣ材料
の注入口であるスプル５の近傍が望ましい。これは、最
後に金型に注入された材料の反応が最も遅れるため、そ
の位置でＩＭＣ塗料の注入タイミングを設定するのが適
切となるからである。もし、図２の９’に示すように、
圧力センサ−をスプル５から離れた位置に設置し、その
デ−タに基づいてＩＭＣ塗料の注入タイミングを設定す
ると、スプル近傍のＢＭＣ材料が未硬化のため、ＩＭＣ
塗料が裏側に回り込み、表面に良好なＩＭＣ塗膜が形成
できなくなる。The pressure sensor 9 is preferably installed near the sprue 5, which is the injection port for the BMC material. This is because the reaction of the material injected into the mold last is the slowest, so it is appropriate to set the injection timing of the IMC paint at that position. If, as shown at 9' in Figure 2,
If the pressure sensor is installed at a position away from the sprue 5 and the IMC paint injection timing is set based on that data, the IMC material near the sprue will not be cured.
The paint wraps around to the back side, making it impossible to form a good IMC coating on the surface.
【００１８】[0018]
【発明の効果】本発明は、ＢＭＣ成形体の表面にＩＭＣ
ショ−トを発生することなく、表面品質の良好な成形品
が能率良く製造できる。Effects of the Invention The present invention provides IMC on the surface of a BMC molded body.
Molded products with good surface quality can be efficiently manufactured without causing short circuits.
【図１】本発明方法に使用する金型の断面図。FIG. 1 is a sectional view of a mold used in the method of the present invention.
【図２】成形品の平面図。FIG. 2 is a plan view of the molded product.
【図３】図１の一部拡大断面図。FIG. 3 is a partially enlarged sectional view of FIG. 1;
【図４】従来の射出成形金型の断面図。FIG. 4 is a sectional view of a conventional injection mold.
【図５】従来の塗装欠陥を示す図。FIG. 5 is a diagram showing conventional coating defects.
【図６】従来の塗装欠陥を示す図。FIG. 6 is a diagram showing conventional coating defects.
【図７】従来の塗装欠陥を示す図。FIG. 7 is a diagram showing conventional painting defects.
【図８】本発明の成形工程を示す図。FIG. 8 is a diagram showing the molding process of the present invention.
【図９】本発明の塗料注入時決定のための測定図。FIG. 9 is a measurement diagram for determining the paint injection time of the present invention.
１ 成形品 ３ 固定型 ４ 上型 ５ スプル ６ 塗料注入口 ７ 喰切り ８ パ−ティング面 ９ 圧力センサ− １０ 真空脱気口 1 Molded product 3 Fixed type 4 Upper mold 5 Sprue 6 Paint inlet 7. Cutting 8 Parting surface 9 Pressure sensor 10 Vacuum deaeration port
Claims (1)
した金型のプラスチック注入口の近傍に圧力センサ−を
設置し、該金型にプラスチックを注入して成形する際、
前記圧力センサ−が型内のプラスチックの発熱膨張によ
るピ−ク圧力を過ぎ所定の圧力降下を検出した時点で成
形の圧力を抜き、真空脱気した型内に塗料を高圧で注入
し、次いで成形の圧力を上げて注入した塗料を型内に流
動させ、その後塗料を硬化することを特徴とするプラス
チックのインモ−ルドコ−ティング法。Claim 1: A pressure sensor is installed near a plastic injection port of a mold in which a cutout is formed on the periphery of a shaped part of a molded product, and when plastic is injected into the mold and molded,
When the pressure sensor detects a predetermined pressure drop after passing the peak pressure caused by heat-generating expansion of the plastic in the mold, the molding pressure is released, paint is injected at high pressure into the vacuum-degassed mold, and then the molding is started. An in-mold coating method for plastics, which is characterized by increasing the pressure to cause the injected paint to flow into the mold, and then curing the paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12666291A JP3094508B2 (en) | 1991-04-30 | 1991-04-30 | Plastic inmold coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12666291A JP3094508B2 (en) | 1991-04-30 | 1991-04-30 | Plastic inmold coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04329112A true JPH04329112A (en) | 1992-11-17 |
| JP3094508B2 JP3094508B2 (en) | 2000-10-03 |
Family
ID=14940768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12666291A Expired - Fee Related JP3094508B2 (en) | 1991-04-30 | 1991-04-30 | Plastic inmold coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3094508B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1088648A1 (en) * | 1999-09-29 | 2001-04-04 | Toyoda Gosei Co., Ltd. | Molded product having a coating film and process for forming coating film |
| WO2006070813A1 (en) * | 2004-12-28 | 2006-07-06 | Rimtec Corporation | Mold, in-mold coating method and formed article with coating |
| JP2007055033A (en) * | 2005-08-23 | 2007-03-08 | Ube Machinery Corporation Ltd | Mold for multi-layer molding of thermoplastic resin and multi-layer molding method |
| JP2007253494A (en) * | 2006-03-24 | 2007-10-04 | Ube Machinery Corporation Ltd | In-mold coating molding method, in-mold coating molding device and in-mold coating molded product |
-
1991
- 1991-04-30 JP JP12666291A patent/JP3094508B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1088648A1 (en) * | 1999-09-29 | 2001-04-04 | Toyoda Gosei Co., Ltd. | Molded product having a coating film and process for forming coating film |
| US6607681B1 (en) | 1999-09-29 | 2003-08-19 | Toyoda Gosei, Co., Ltd. | Molded product having a coating film and process for forming coating film |
| WO2006070813A1 (en) * | 2004-12-28 | 2006-07-06 | Rimtec Corporation | Mold, in-mold coating method and formed article with coating |
| JPWO2006070813A1 (en) * | 2004-12-28 | 2008-06-12 | Rimtec株式会社 | Mold, in-mold coating method, and molded product with coating |
| JP4758911B2 (en) * | 2004-12-28 | 2011-08-31 | Ｒｉｍｔｅｃ株式会社 | Mold, in-mold coating method, and molded product with coating |
| JP2007055033A (en) * | 2005-08-23 | 2007-03-08 | Ube Machinery Corporation Ltd | Mold for multi-layer molding of thermoplastic resin and multi-layer molding method |
| JP2007253494A (en) * | 2006-03-24 | 2007-10-04 | Ube Machinery Corporation Ltd | In-mold coating molding method, in-mold coating molding device and in-mold coating molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3094508B2 (en) | 2000-10-03 |
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