JPH11277577A - Method for coating in mold - Google Patents
Method for coating in moldInfo
- Publication number
- JPH11277577A JPH11277577A JP1873699A JP1873699A JPH11277577A JP H11277577 A JPH11277577 A JP H11277577A JP 1873699 A JP1873699 A JP 1873699A JP 1873699 A JP1873699 A JP 1873699A JP H11277577 A JPH11277577 A JP H11277577A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- clamping pressure
- mold clamping
- molding
- seconds
- 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.)
- Pending
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
- 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]
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、合成樹脂成形材料
を射出成形法、射出圧縮成形法あるいは射出プレス成形
法などによる成形型内で成形し、得られた合成樹脂成形
品の表面を、その成形型内で被覆剤を注入することによ
り被覆する型内被覆方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a method for molding a synthetic resin molding material in a mold by an injection molding method, an injection compression molding method, an injection press molding method or the like. The present invention relates to an in-mold coating method for coating by injecting a coating agent into a mold.
【０００２】[0002]
【従来の技術】型内被覆方法は、成形品表面の品質向上
及び塗装工程の短縮を目的として、利用されている。特
に外観及び品質に対する要求度の高い自動車において
は、その外板や外装部品等に広く利用されている。2. Description of the Related Art An in-mold coating method is used for the purpose of improving the quality of the surface of a molded product and shortening the coating process. In particular, automobiles with high demands on appearance and quality are widely used for their outer plates and exterior parts.
【０００３】このような型内被覆方法としては、例えば
ＵＳＰ４０７６７８８号、ＵＳＰ４０８１５７８号、Ｕ
ＳＰ４３３１７３５号、ＵＳＰ４３６６１０９号、ＵＳ
Ｐ４６６８４６０号、特開平５−３０１２５１号公報、
特開平５−３１８５２７号公報、特開平８−１４２１１
９号公報等において開示されている。[0003] Such in-mold coating methods include, for example, US Pat. No. 4,076,788, US Pat.
SP43331735, USP4366109, US
P4668460, JP-A-5-301251,
JP-A-5-318527, JP-A-8-14211
No. 9 and other publications.
【０００４】[0004]
【発明が解決しようとする課題】これら特許公報に記載
されている方法では、成形型内で合成樹脂成形材料を成
形後、成形型内表面と得られた成形品表面との間に被覆
剤を注入する際の型締め圧力や金型離間の規定はあるも
のの、被覆剤注入後の型締め圧力の規定については、ほ
とんど注意が払われておらず、一定圧力で型締めされて
いる。被覆剤注入後の型締め圧力により、すなわち注入
した被覆剤に対する圧力によって、成形品のリブやボス
といった厚肉部は圧縮され、その部分の被覆剤は厚くな
り、その状態で被覆剤は硬化される。その後型締め圧を
開放し、被覆された成形品を金型から取り出す。本発明
者等はこの型締め圧を開放する時、被覆剤によって圧縮
されていたリブやボス部がスプリングバック現象によっ
て戻され、盛り上がり、外観上の欠陥となりやすいこと
を見出した。この現象は、被覆剤注入時の成形樹脂の硬
化（固化）度合い、弾性圧縮され易さも影響されるが、
特に被覆剤注入後の型締め圧が高いと生じやすいことが
確認された。In the method described in these patent publications, after molding a synthetic resin molding material in a molding die, a coating agent is applied between the inner surface of the molding die and the surface of the obtained molded product. Although there are provisions for the mold clamping pressure during injection and the mold separation, little attention is paid to the regulation of the mold clamping pressure after coating agent injection, and the mold is clamped at a constant pressure. Due to the mold clamping pressure after coating material injection, that is, the pressure on the injected coating material, the thick parts such as ribs and bosses of the molded product are compressed, the coating material at that part becomes thicker, and the coating material is cured in that state. You. Thereafter, the mold clamping pressure is released, and the coated molded article is taken out of the mold. The present inventors have found that when the mold clamping pressure is released, the ribs and the bosses compressed by the coating agent are returned by the springback phenomenon, and the ribs and the bosses are likely to swell and become a defect in appearance. This phenomenon is affected by the degree of curing (solidification) of the molding resin at the time of injection of the coating agent and the ease of elastic compression.
In particular, it was confirmed that a high mold-clamping pressure after the coating agent injection was likely to occur.
【０００５】本発明の目的は上記事情に基づいて、射出
成形、射出圧縮成形、射出プレス成形などによる成形型
内での合成樹脂成形材料の成形後に、その同一成形型内
で、成形品の表面に被覆剤をコーティングする際、成形
品の厚肉部の盛り上がり現象（ハンプ現象）の発生を防
止し、得られる被覆された成形品の高い品質を確保でき
る型内被覆方法を提供するものである。The object of the present invention is based on the above circumstances, and after molding a synthetic resin molding material in a mold by injection molding, injection compression molding, injection press molding or the like, the surface of the molded article is formed in the same mold. It is an object of the present invention to provide an in-mold coating method capable of preventing the occurrence of a swelling phenomenon (hump phenomenon) of a thick part of a molded product when coating a coating material on the molded product, and ensuring high quality of the obtained molded product. .
【０００６】[0006]
【課題を解決するための手段】本発明に従って、射出成
形法、射出圧縮成形法または射出プレス成形法による固
定金型部と可動金型部からなる成形型内で型締め圧力を
かけて合成樹脂成形材料を成形後、その同一成形型内に
おいて上記型締め圧を低減し、あるいは固定金型部と可
動金型部を離間して成形型内表面と得られた成形品の表
面との間に被覆剤を注入すること及び再度型締めを行な
い乍ら該成形品の表面を該被覆剤で被覆することにより
なる、成形品の型内被覆方法において、（１）上記成形
品の表面が、被覆剤の注入圧力、流動圧力に耐えうる程
度に硬化又は固化した段階で、上記被覆剤の注入が行わ
れること、（２）被覆剤注入後の上記再度型締めが所定
の多段可変式の型締め圧力及び型締め圧力移行時間の条
件下で実施されることを特徴とする型内被覆方法が提供
される。According to the present invention, a synthetic resin is applied by applying a clamping pressure in a molding die comprising a fixed mold portion and a movable mold portion by injection molding, injection compression molding or injection press molding. After molding the molding material, reduce the mold clamping pressure in the same molding die, or separate the fixed mold portion and the movable mold portion from each other, and between the inner surface of the molding die and the surface of the obtained molded product. A method for in-mold coating of a molded article, which comprises injecting a coating agent and coating the surface of the molded article with the coating agent while performing mold clamping again, wherein (1) the surface of the molded article is coated Injection of the coating agent is performed at a stage where the coating agent is hardened or solidified so as to withstand the injection pressure and the flow pressure of the agent, and (2) the mold re-clamping after injection of the coating agent is performed by a predetermined multi-stage variable mold clamping. Implemented under conditions of pressure and mold transfer time Mold coating wherein the door is provided.
【０００７】本発明によれば、成形型内にて合成樹脂成
形材料を成形後、成形型内に被覆剤を注入し、成形型内
で被覆剤を均一に押し広げ、硬化する際、成形品の形
状、大きさなどに応じた、適正な多段可変型締め圧力を
保持しながら、被覆剤を合成樹脂成形品表面に被覆する
ものである。According to the present invention, after molding a synthetic resin molding material in a molding die, a coating material is injected into the molding die, and the coating material is uniformly spread and cured in the molding die. The coating agent is coated on the surface of the synthetic resin molded product while maintaining an appropriate multi-stage variable mold clamping pressure according to the shape and size of the synthetic resin.
【０００８】本発明において使用される合成樹脂成形材
料としては、不飽和ポリエステル樹脂等の熱硬化性樹脂
をマトリックスとする繊維強化プラスチックであるＳＭ
Ｃ（シートモールディングコンパウンド）及びＢＭＣ
（バルクモールディングコンパウンド）などの熱硬化性
合成樹脂材料やポリエチレン、ポリプロピレン、アクリ
ロニトリル−ブタジエン−スチレン共重合体、ポリカー
ボネート、ポリアミド、ポリエチレンテレフタレート、
ポリブチレンテレフタレート、変性ポリフェニレンエー
テルなどの熱可塑性合成樹脂材料あるいはこれらのアロ
イ材、更にはこれらに繊維状あるいは鱗片状のフィラー
を配合したもの等が挙げられる。The synthetic resin molding material used in the present invention is SM, which is a fiber-reinforced plastic having a matrix of a thermosetting resin such as an unsaturated polyester resin.
C (Sheet molding compound) and BMC
(Bulk molding compound) such as thermosetting synthetic resin materials, polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, polyethylene terephthalate,
Examples thereof include thermoplastic synthetic resin materials such as polybutylene terephthalate and modified polyphenylene ether or alloys thereof, and further, those in which a fibrous or flaky filler is blended.
【０００９】また、本発明において使用される被覆剤
は、従来から公知の各種型内被覆用被覆剤が利用出来、
例えば、特開昭５４−３６３６９号、特開昭５４−１３
９９６２号、特開昭５５−６５５１１号、特開昭５７−
１４０号、特開昭６０−２１２４６７号、特開昭６０−
２２１４３７号、特開平１−２２９６０５号、特開平５
−７０７１２号、特開平５−１４８３７５号、特開平６
−１０７７５０号、特開平８−１１３７６１号等の公報
に記載の被覆剤が代表的なものとして挙げられる。As the coating agent used in the present invention, conventionally known various coating agents for in-mold coating can be used.
For example, JP-A-54-36369 and JP-A-54-13
No. 9962, JP-A-55-65511, JP-A-57-65511.
No. 140, JP-A-60-212467, JP-A-60-210
No. 221437, JP-A-1-229605, JP-A-5
-70712, JP-A-5-148375, JP-A-6
Coating agents described in JP-A-107750 and JP-A-8-113761 are typical examples.
【００１０】特に好適には、少なくとも２個以上の（メ
タ）アクリレート基を有するウレタンアクリレートオリ
ゴマー、エポキシアクリレートオリゴマー等のオリゴマ
ーもしくはその樹脂、又は不飽和ポリエステル樹脂２０
〜７０重量％とメチル（メタ）アクリレート、エチル
（メタ）アクリレート、プロピル（メタ）アクリレー
ト、ブチル（メタ）アクリレート、２−エチルヘキシル
（メタ）アクリレート、（メタ）アクリル酸、酢酸ビニ
ル、スチレンなどの共重合可能なエチレン性不飽和モノ
マー８０〜３０重量％からなるビヒクル成分、顔料及び
重合開始剤等からなる被覆剤である。また、エポキシ樹
脂／ポリアミン硬化系、ポリオール樹脂／ポリイソシア
ネート硬化系などの、型内注入直前に、主剤／硬化剤を
混合する２液型被覆剤も適用可能である。Particularly preferably, an oligomer such as a urethane acrylate oligomer or epoxy acrylate oligomer having at least two or more (meth) acrylate groups or a resin thereof, or an unsaturated polyester resin 20
70% by weight of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acrylic acid, vinyl acetate, styrene, etc. A coating agent comprising a vehicle component comprising 80 to 30% by weight of a polymerizable ethylenically unsaturated monomer, a pigment and a polymerization initiator. Further, a two-pack type coating agent, such as an epoxy resin / polyamine curing system or a polyol resin / polyisocyanate curing system, which mixes a main agent / curing agent immediately before injection into a mold can also be applied.
【００１１】[0011]
【発明の実施の形態】以下、本発明の型内被覆方法を実
施するための射出成形機の構成およびその成形型を、図
面を参照して、具体的に説明する。図１において、符号
１は射出成形機の型締め装置の固定盤、２は可動盤であ
り、それぞれ互いに対向する成形型部材である固定金型
部３および可動金型部４を備えている。可動盤２が型締
めシリンダ５によって進退動作される構成になってい
る。そして、固定金型部３および可動金型部４の嵌合個
所には、所要形状のキャビティ６が形成されていて、こ
の中に溶融もしくは軟化状態の合成樹脂成形材料を射
出、充填し、硬化あるいは固化するのである。溶融合成
樹脂成形材料を射出、充填する場合、上記キャビティ６
には、スクリューを有する射出シリンダ７から、ノズル
８およびスプルー９を介して、合成樹脂成形材料が射出
できるようになっている。なお、図中、符号１０はリブ
部（ボス部）１１は離型時のエジェクタピンである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an injection molding machine for carrying out the in-mold coating method of the present invention and its molding die will be specifically described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a fixed plate of a mold clamping device of an injection molding machine, and 2 denotes a movable plate, which includes a fixed mold portion 3 and a movable mold portion 4 which are molding members facing each other. The movable platen 2 is configured to be moved forward and backward by the mold clamping cylinder 5. A cavity 6 having a required shape is formed at a fitting portion of the fixed mold portion 3 and the movable mold portion 4, and a molten or softened synthetic resin molding material is injected, filled, and cured therein. Or it solidifies. When the molten synthetic resin molding material is injected and filled, the cavity 6 is used.
, A synthetic resin molding material can be injected from an injection cylinder 7 having a screw via a nozzle 8 and a sprue 9. In the drawings, reference numeral 10 denotes a rib (boss) 11 denotes an ejector pin at the time of release.
【００１２】また、固定金型３及び可動金型４の嵌合個
所にシェアエッジ構造部分が形成されており、このシェ
アエッジ構造部分に嵌合溝（図示されず）を設けて、こ
こにＯ−リングなどの弾性シール材を嵌合し、シェアエ
ッジ構造部の被覆剤に対するシール性を向上させてい
る。Further, a shearing edge structure is formed at a place where the fixed mold 3 and the movable mold 4 are fitted, and a fitting groove (not shown) is provided in the shearing edge structure, and an O groove is provided here. -An elastic sealing material such as a ring is fitted to improve the sealing performance of the shear edge structure with respect to the coating agent.
【００１３】一方、図１において被覆剤の注入手段とし
ては、シャットオフピン１２Ａを備えたインジェクタ１
２、上記インジェクタ１２に所定量の被覆剤を供給する
被覆剤計量シリンダ１３および被覆剤をその貯蔵部１４
から上記計量シリンダ１３に供給するための供給ポンプ
１５が装備されている。なお、上記計量シリンダ１３に
は被覆剤注入用のプランジャー・レギュレータ１３Ａが
備えられている。On the other hand, in FIG. 1, as an injection means of the coating material, an injector 1 having a shut-off pin 12A is used.
2. A coating agent measuring cylinder 13 for supplying a predetermined amount of coating agent to the injector 12 and a coating agent for storing the coating agent
And a supply pump 15 for supplying the same to the measuring cylinder 13. The measuring cylinder 13 is provided with a plunger regulator 13A for injecting a coating agent.
【００１４】しかして、成形に際しては、先ず、型締め
シリンダ５を動作して、金型（固定金型部３と可動金型
部４）を閉じ、型締め圧を付加する。この型締め圧は、
合成樹脂成形材料の射出圧力に対抗できる必要がある。
通常この射出圧力は、ノズル８の部分で４００〜２，５
００ｋｇｆ／ｃｍ2 の高圧である。この過程で、供給ポ
ンプ１５が作動し、計量シリンダ１３に必要な量の被覆
剤を供給する。In molding, first, the mold clamping cylinder 5 is operated to close the molds (the fixed mold section 3 and the movable mold section 4), and a mold clamping pressure is applied. This mold clamping pressure is
It is necessary to be able to withstand the injection pressure of the synthetic resin molding material.
Usually, this injection pressure is 400 to 2.5 in the nozzle 8 portion.
High pressure of 00 kgf / cm 2 . In this process, the supply pump 15 operates to supply a necessary amount of the coating material to the measuring cylinder 13.
【００１５】次いで、射出シリンダ７から、溶融もしく
は軟化状態の合成樹脂成形材料がノズル８を経由してキ
ャビティ６内に射出される。上記合成樹脂成形材料が金
型内で適正に（被覆剤の注入圧力・流動圧力に耐える程
度に）硬化あるいは固化した段階で、上記型締め圧を低
減または固定金型部３と可動金型部４をその嵌合部が離
れない程度に開放する。次いで、インジェクタ１２は、
そのシャットオフピン１２Ａを動作し、その注入口を開
放する。次いで、計量シリンダ１３の被覆剤注入用のプ
ランジャー・レギュレータ１３Ａを動作し、キャビティ
６、すなわち固定金型部３の内壁と合成樹脂成形品表面
との間に被覆剤を注入、充填させる。Next, a synthetic resin molding material in a molten or softened state is injected into the cavity 6 through the nozzle 8 from the injection cylinder 7. At the stage where the synthetic resin molding material is properly cured or solidified in the mold (to the extent that it can withstand the injection pressure and flow pressure of the coating agent), the mold clamping pressure is reduced or the fixed mold part 3 and the movable mold part are reduced. 4 is opened to the extent that the fitting portion does not separate. Next, the injector 12
The shut-off pin 12A is operated to open the inlet. Next, the plunger regulator 13A for injecting the coating material of the measuring cylinder 13 is operated to inject and fill the coating material between the cavity 6, that is, the inner wall of the fixed mold portion 3 and the surface of the synthetic resin molded product.
【００１６】被覆剤注入後、再びシャットオフピン１２
Ａで注入口を閉じ、型締めシリンダ５を動作させ型締め
操作を行い、型内で被覆剤を拡散させ成形品表面への被
覆を達成するのである。この場合、本発明では、被覆剤
注入後の型締めシリンダ５の動作速度及び圧力を適当な
制御系で制御することにより、図２に示すように多段可
変式、例えば３段階の型締め圧力と速度で型締めを行
い、被覆剤を硬化させる。After the coating agent is injected, the shut-off pin 12 is
The injection port is closed at A, the mold clamping cylinder 5 is operated to perform the mold clamping operation, and the coating agent is diffused in the mold to achieve coating on the surface of the molded product. In this case, in the present invention, the operating speed and pressure of the mold clamping cylinder 5 after the coating agent is injected are controlled by an appropriate control system, so that a multi-stage variable type as shown in FIG. The mold is clamped at a speed to cure the coating material.
【００１７】この適正な型締め圧力と速度（すなわち型
締め圧力移行時間と型締め圧力保持時間）は、キャビテ
ィ６の大きさや形状、また被覆剤の種類等により多少変
動するが、リブ部及びボス部のハンプ防止や被覆された
成形品の高品質化の観点から次の条件が好ましい。 ＜初期段階＞型締め圧力は、１０〜１００ｋｇｆ／ｃｍ
2 （成形品投影面積当たり）が好ましく、また型締め圧
力移行時間は、０．５〜１０秒、型締め圧力保持時間は
０．５〜２０秒が好ましい。なお、型締め圧力が前記範
囲より低いと成形品全面に均一な被膜が形成しにくくな
り、密着性も低下する傾向にあり、逆に前記範囲より高
いとハンプ防止効果が低下する傾向にある。The appropriate mold clamping pressure and speed (ie, mold clamping pressure transition time and mold clamping pressure holding time) slightly vary depending on the size and shape of the cavity 6 and the type of coating agent. The following conditions are preferred from the viewpoint of preventing humps in the part and improving the quality of the coated molded product. <Initial stage> Mold clamping pressure is 10 to 100 kgf / cm
2 (per projected area of the molded article), the mold clamping pressure transition time is preferably 0.5 to 10 seconds, and the mold clamping pressure holding time is preferably 0.5 to 20 seconds. If the mold clamping pressure is lower than the above range, it is difficult to form a uniform coating on the entire surface of the molded article, and the adhesiveness tends to decrease. Conversely, if the mold clamping pressure is higher than the above range, the hump preventing effect tends to decrease.
【００１８】また、型締め圧力移行時間が前記範囲より
短いと被覆剤に気泡が入りやすく、顔料の分離が生じや
すくなる傾向にあり、逆に前記範囲より長いと被膜にシ
ワ、ワレ等が生じやすくなる傾向にある。On the other hand, if the mold-clamping pressure transition time is shorter than the above range, air bubbles tend to enter the coating agent and the pigment tends to separate, whereas if it is longer than the above range, wrinkles, cracks and the like are generated on the coating. It tends to be easier.
【００１９】また型締め圧力保持時間が前記範囲より短
いと被膜の密着性が低下する傾向にあり、逆に前記範囲
より長いとハンプ防止効果が低下する傾向にある。 ＜中間段階＞型締め圧力は、初期段階のそれの２０〜８
０％が好ましく、型締め圧力移行時間は、０．１〜５
秒、型締め圧力保持時間は０．５〜２０秒が好ましい。If the clamping pressure holding time is shorter than the above range, the adhesion of the coating tends to decrease, and if it is longer than the above range, the hump prevention effect tends to decrease. <Intermediate stage> The mold clamping pressure is 20 to 8 that of the initial stage.
0% is preferable, and the transition time of the mold clamping pressure is 0.1 to 5%.
Second, the mold clamping pressure holding time is preferably 0.5 to 20 seconds.
【００２０】なお、型締め圧力が前記範囲より低いと初
期段階との圧力差が大きくなり、その反動により被膜中
に気泡を吸い込み易くなり、シワも生じやすくなる傾向
にあり、逆に前記範囲より高いとハンプ防止効果が低下
する傾向にある。If the mold clamping pressure is lower than the above-mentioned range, the pressure difference from the initial stage becomes large, and the reaction tends to suck air bubbles into the coating and tend to cause wrinkles. If it is too high, the hump prevention effect tends to decrease.
【００２１】また型締め圧力移行時間が前記範囲より短
いと被膜中に気泡を吸い込みやすくなる傾向にあり、逆
に前記範囲より長いと被膜にシワが生じやすくなる傾向
にある。On the other hand, if the mold-clamping pressure transition time is shorter than the above range, air bubbles tend to be sucked into the coating, and if it is longer than the above range, the coating tends to wrinkle.
【００２２】また、型締め圧力保持時間が前記範囲より
短いと被膜の密着性が低下する傾向にある。 ＜最終段階＞最終段階は、中間段階と同一条件でそのま
ま継続させて型締めしておくことも可能である。If the mold clamping pressure holding time is shorter than the above range, the adhesion of the coating tends to decrease. <Final stage> The final stage can be continued and clamped under the same conditions as the intermediate stage.
【００２３】しかしながら型締め圧力は初期段階よりは
低く、かつ中間段階のそれの４０〜２００％が好まし
く、型締め圧力移行時間は、０．１〜５秒、型締め圧力
保持時間は、１秒以上が好ましい。型締め圧力保持時間
の上限は特にないが、４０〜１２０秒が適当である。な
お、型締め圧力が前記範囲より低いと被膜の密着性が低
下する傾向にあり、逆に前記範囲より高いと成形品脱型
時に被膜にワレが生じやすくなる傾向にある。However, the mold clamping pressure is preferably lower than that of the initial stage and 40 to 200% of that of the intermediate stage. The mold clamping pressure transition time is 0.1 to 5 seconds, and the mold clamping pressure holding time is 1 second. The above is preferred. There is no particular upper limit on the mold clamping pressure holding time, but an appropriate time is 40 to 120 seconds. If the mold clamping pressure is lower than the above range, the adhesion of the coating tends to decrease, and if it is higher than the above range, the coating tends to crack when the molded product is released from the mold.
【００２４】また型締め圧力移行時間、型締め圧力保持
時間は、中間段階での説明と同様の傾向がある。The mold-clamping pressure transition time and mold-clamping pressure holding time tend to be similar to those described in the intermediate stage.
【００２５】上述の実施の形態において重要なことは、
被覆剤注入後の型締め圧力を多段階にかつ、その型締め
圧力移行時間を制御することで、成形品のリブ及びボス
部の盛り上がり（ハンプ）の発生を避け、高い品質を確
保する条件となる。What is important in the above embodiment is that
By controlling the mold clamping pressure after coating agent injection in multiple stages and controlling the mold clamping pressure transition time, it is possible to avoid the occurrence of bumps (humps) in the ribs and bosses of the molded product and to ensure high quality. Become.
【００２６】[0026]
【実施例】以下、実施例を挙げて本発明を更に詳細に説
明するが、本発明はこれらの実施例により何らその範囲
を限定するものではない。 ［実施例−１］長さ２００ｍｍ、幅１５０ｍｍ、高さ１
０ｍｍ、リブ部の幅１ｍｍ、深さ５ｍｍの箱形状の合成
樹脂成形品を得るためのキャビティを有する固定金型部
と可動金型部からなる金型内で、成形品に対する型内被
覆を実施する場合に、上記金型温度として固定金型部３
を１２０℃、可動金型部４を１１５℃に設定して、先ず
ポリアミド樹脂を射出シリンダー７内に充填し、２２０
〜２４０℃に加熱溶融し、３００トン（１０００ｋｇｆ
／ｃｍ2 、成形品の投影面積当たり）の型締め圧力で型
締めされた金型内に約４秒かけて射出し、１０秒間冷却
し、得られた成形品の表面が被覆剤の注入圧力、流動圧
力に耐え得る程度に固化させた。EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. [Example-1] Length 200 mm, width 150 mm, height 1
In-mold coating of the molded product is performed in a mold composed of a fixed mold portion and a movable mold portion having a cavity for obtaining a box-shaped synthetic resin molded product having a thickness of 0 mm, a width of a rib portion of 1 mm, and a depth of 5 mm. When the fixed mold part 3 is used as the mold temperature,
Is set to 120 ° C. and the movable mold part 4 is set to 115 ° C. First, the polyamide resin is filled into the injection cylinder 7 and
Heat to ~ 240 ° C, 300 tons (1000kgf
/ Cm 2 , per projected area of the molded article), injected into a mold clamped at a mold clamping pressure for about 4 seconds, cooled for 10 seconds, and the surface of the obtained molded article was exposed to a coating agent injection pressure. And solidified to withstand the flow pressure.
【００２７】次いで、型締め圧力を５トン（１７ｋｇｆ
／ｃｍ2 、成形品の投影面積当たり）に減圧した後、ウ
レタンアクリレートオリゴマーとエポキシアクリレート
オリゴマーとを主成分とする被覆剤Ａ（表１参照）を計
量シリンダ１３に、３ｃｍ3計量した。そして、キャビ
ティ６に約３秒かけて注入した。Next, the mold clamping pressure was increased to 5 tons (17 kgf
/ Cm 2 , per projected area of the molded article), and then 3 cm 3 of the coating agent A (see Table 1) containing a urethane acrylate oligomer and an epoxy acrylate oligomer as main components was measured into the measuring cylinder 13. Then, it was injected into the cavity 6 over about 3 seconds.
【００２８】注入完了後、型締め圧力を２秒かけて２１
トン（７０ｋｇｆ／ｃｍ2 、成形品の投影面積当たり）
まで加圧し、５秒間保持した。次いで、型締め圧力を１
秒かけて１０トン（３３ｋｇｆ／ｃｍ2 、成形品の投影
面積当たり）に減圧し、１０秒間保持した後、さらに型
締め圧力を１秒かけて５トン（１７ｋｇｆ／ｃｍ2 、成
形品の投影面積当たり）に減圧し、６０秒間保持し被覆
剤を硬化させた。After the injection is completed, the mold clamping pressure is increased to 21 over 2 seconds.
Ton (70 kgf / cm 2 , per projected area of molded product)
And held for 5 seconds. Next, the mold clamping pressure is set to 1
After reducing the pressure to 10 tons (33 kgf / cm 2 , per projected area of the molded product) over 2 seconds and holding for 10 seconds, the mold clamping pressure was further increased to 5 tons (17 kgf / cm 2 , the projected area of the molded product over 1 second). And the pressure was maintained for 60 seconds to cure the coating.
【００２９】得られた被覆成形品のリブ部の盛り上がり
量を表面形状測定器［（株）東京精密社製 商品名「サ
ーフコム」］により断面曲線から求めたところ１．５μ
ｍのハンプ（盛り上がり）であり、平滑な表面であっ
た。 ［比較例−１］実施例−１と同一条件にて、被覆剤注入
まで行った。次いで、被覆剤注入完了後、型締め圧力を
２秒かけて２１トン（７０ｋｇｆ／ｃｍ2 、成形品の投
影面積当たり）とし、７５秒間保持し被覆剤を硬化させ
た。The protruding amount of the rib portion of the obtained coated molded product was determined from the cross-sectional curve by using a surface shape measuring device [trade name “Surfcom” manufactured by Tokyo Seimitsu Co., Ltd.] to find 1.5 μm.
m hump (swell) and the surface was smooth. [Comparative Example 1] Under the same conditions as in Example 1, the procedure up to the injection of the coating agent was performed. Next, after the coating agent injection was completed, the mold clamping pressure was set at 21 tons (70 kgf / cm 2 , per projected area of the molded product) over 2 seconds, and the coating was held for 75 seconds to cure the coating agent.
【００３０】得られた被覆成形品のリブ部の盛り上がり
量は、２０．０μｍであり、平滑性に劣る表面であっ
た。 ［実施例−２］直径３７０ｍｍ、リブ部の幅１．８ｍ
ｍ、深さ５０ｍｍのホイルカバー形状の合成樹脂成形品
を得るためのキャビティを有する金型で、上記金型の固
定金型部３を１２０℃、可動金型部４を１１５℃に設定
して、先ず変性ポリフェニレンエーテル樹脂を射出シリ
ンダー内に充填し、２５０〜２７０℃に加熱溶融し、５
００トン（５００ｋｇｆ／ｃｍ2 、成形品の投影面積当
たり）の型締め圧力で型締めされた金型内に約５秒かけ
て射出し、約２０秒間冷却し、得られた成形品の表面が
被覆剤の注入圧力、流動圧力に耐え得る程度に固化させ
た。The protruding amount of the rib portion of the obtained coated molded product was 20.0 μm, and the surface had poor smoothness. [Example-2] 370 mm in diameter, 1.8 m in width of rib portion
m, a mold having a cavity for obtaining a foil cover-shaped synthetic resin molded product having a depth of 50 mm. The fixed mold part 3 of the mold is set at 120 ° C., and the movable mold part 4 is set at 115 ° C. First, a modified polyphenylene ether resin is filled into an injection cylinder, and heated and melted at 250 to 270 ° C.
The mold was injected into a mold clamped at a clamping pressure of 00 tons (500 kgf / cm 2 , per projected area of the molded product) over about 5 seconds, and cooled for about 20 seconds. It was solidified to the extent that it could withstand the injection pressure and flow pressure of the coating agent.
【００３１】次いで、型締め圧力を１０トン（１０ｋｇ
ｆ／ｃｍ2 、成形品の投影面積当たり）に減圧した後、
ウレタンアクリレートオリゴマーを主成分とする被覆剤
Ｂ（表１参照）を計量シリンダ１３に、１０ｃｍ3計量
した。そして、キャビティ６に約４秒かけて注入した。Next, the mold clamping pressure was increased to 10 tons (10 kg).
f / cm 2 , per projected area of the molded product)
Coating agent B (see Table 1) containing a urethane acrylate oligomer as a main component was weighed to a measuring cylinder 13 at 10 cm 3 . Then, it was injected into the cavity 6 over about 4 seconds.
【００３２】注入完了後、型締め圧力を５秒かけて４０
トン（４０ｋｇｆ／ｃｍ2 、成形品の投影面積当たり）
まで加圧し２秒間保持した。次いで、型締め圧力を２秒
かけて２０トン（２０ｋｇｆ／ｃｍ2 、成形品の投影面
積当たり）に減圧し、７０秒間保持し被覆剤を硬化させ
た。After completion of the injection, the mold clamping pressure is increased to 40 over 5 seconds.
Ton (40 kgf / cm 2 , per projected area of molded product)
And held for 2 seconds. Next, the mold clamping pressure was reduced to 20 tons (20 kgf / cm 2 , per projected area of the molded product) over 2 seconds, and the pressure was maintained for 70 seconds to cure the coating material.
【００３３】得られた被覆成形品のリブ部の盛り上がり
量は、１．０μｍであり、平滑な表面であった。 ［実施例−３］長さ２００ｍｍ、幅１５０ｍｍ、高さ１
０ｍｍの箱形状の合成樹脂成形品を得るためのキャビテ
ィを有する金型で、上記金型の固定金型部３を１５５
℃、可動金型部４を１６０℃に設定して、先ず、不飽和
ポリエステル樹脂をマトリックスとするＢＭＣと呼ばれ
る成形材料を、３００トン（１０００ｋｇｆ／ｃｍ2 、
成形品の投影面積当たり）の型締め圧力で型締めされた
キャビティ６に射出し、６０秒間硬化させた。The amount of protrusion of the rib portion of the obtained coated molded product was 1.0 μm, and the surface was smooth. [Example-3] Length 200 mm, width 150 mm, height 1
A mold having a cavity for obtaining a synthetic resin molded article having a box shape of 0 mm.
° C., by setting the movable mold part 4 to 160 ° C., firstly, the molding material called BMC for the unsaturated polyester resin as a matrix, 300 tons (1000 kgf / cm 2,
The mold 6 was injected into the mold-clamped cavity 6 at a mold-clamping pressure (per projected area of the molded product) and cured for 60 seconds.
【００３４】次いで、型締め圧力を５トン（１７ｋｇｆ
／ｃｍ2 、成形品の投影面積当たり）に減圧した後、ウ
レタンアクリレートオリゴマーとエポキシアクリレート
オリゴマーとを主成分とする被覆剤Ｃ（表１参照）を計
量シリンダ１２に、３ｃｍ3計量した。そして、キャビ
ティ６に約３秒かけて注入した。Next, the mold clamping pressure was increased to 5 tons (17 kgf
/ Cm 2 , per projected area of the molded article), and then 3 cm 3 of the coating material C (see Table 1) containing a urethane acrylate oligomer and an epoxy acrylate oligomer as main components was measured into the measuring cylinder 12. Then, it was injected into the cavity 6 over about 3 seconds.
【００３５】注入完了後、型締め圧力を１秒かけて２１
トン（７０ｋｇｆ／ｃｍ2 、成形品の投影面積当たり）
まで加圧し、６秒間保持した。次いで、型締め圧力を１
秒かけて１０トン（３３ｋｇｆ／ｃｍ2 、成形品の投影
面積当たり）に減圧し、５秒間保持した後、さらに型締
め圧力を１秒かけて１５トン（５０ｋｇｆ／ｃｍ2 、成
形品の投影面積当たり）にし、５０秒間保持し被覆剤を
硬化させた。After the injection is completed, the mold clamping pressure is increased to 21
Ton (70 kgf / cm 2 , per projected area of molded product)
And held for 6 seconds. Next, the mold clamping pressure is set to 1
After reducing the pressure to 10 tons (33 kgf / cm 2 , per projected area of the molded product) over 5 seconds and holding for 5 seconds, the mold clamping pressure is further increased to 15 tons (50 kgf / cm 2 , the projected area of the molded product over 1 second). ) And held for 50 seconds to cure the coating.
【００３６】得られた被覆成形品のリブ部の盛り上がり
量は、１．５μｍであり、平滑な表面であった。 ［実施例−４］直径３７０ｍｍ、リブ部の幅１．８ｍ
ｍ、深さ５０ｍｍのホイルカバー形状の合成樹脂成形品
を得るためのキャビティを有する、固定型と可動型から
なる金型で、成形品に対する型内被覆を実施する場合
に、上記金型温度として固定金型部３を１２０℃、可動
金型部４を１１５℃に設定して、先ず変性ポリフェニレ
ンエーテル樹脂を射出シリンダー７内に充填し、２５０
〜２７０℃に加熱溶融し、５００トン（５００ｋｇｆ／
ｃｍ2 、成形品の投影面積当たり）の型締め圧力で型締
めされた金型内に約５秒かけて射出し、３０秒間冷却
し、得られた成形品の表面が被覆剤の注入圧力、流動圧
力に耐え得る程度に固化させた。The raised amount of the rib portion of the obtained coated molded product was 1.5 μm, and the surface was smooth. [Example-4] 370 mm in diameter, 1.8 m in width of rib portion
m, a mold having a cavity for obtaining a foil cover-shaped synthetic resin molded product having a depth of 50 mm, a mold composed of a fixed mold and a movable mold. The fixed mold part 3 is set at 120 ° C. and the movable mold part 4 is set at 115 ° C. First, the modified polyphenylene ether resin is filled into the injection cylinder 7 and
~ 270 ° C and melted, 500 tons (500kgf /
The mold was injected into the mold clamped at a mold clamping pressure of (cm 2 , per projected area of the molded product) over about 5 seconds, and cooled for 30 seconds. Solidified to withstand the flow pressure.
【００３７】次いで、固定金型部と可動金型部とを０．
５ｍｍ離間させた後、ウレタンアクリレートオリゴマー
を主成分とする被覆剤Ｄ（表１参照）を計量シリンダ１
３に、１０ｃｍ3 計量した。そして、キャビティ６に約
２秒かけて注入した。Next, the fixed mold part and the movable mold part are set to 0.
After a distance of 5 mm, a coating agent D (see Table 1) containing a urethane acrylate oligomer as a main component was charged into a measuring cylinder 1
3, 10 cm 3 was weighed. And it injected | poured into the cavity 6 over about 2 seconds.
【００３８】注入完了後、型締め圧力を８秒かけて２０
トン（２０ｋｇｆ／ｃｍ2 、成形品の投影面積当たり）
まで加圧し、２秒間保持した。次いで、型締め圧力を２
秒かけて１０トン（１０ｋｇｆ／ｃｍ2 、成形品の投影
面積当たり）に減圧し、５秒間保持した。次いで、型締
め圧力を１秒かけて１５トン（１５ｋｇｆ／ｃｍ2 、成
形品の投影面積当たり）に昇圧し、８０秒間保持し被覆
剤を硬化させた。After the injection is completed, the mold clamping pressure is increased to 20 over 8 seconds.
Ton (20 kgf / cm 2 , per projected area of molded product)
And held for 2 seconds. Then, the mold clamping pressure was increased to 2
The pressure was reduced to 10 tons (10 kgf / cm 2 , per projected area of the molded product) over 2 seconds, and the pressure was maintained for 5 seconds. Next, the mold clamping pressure was raised to 15 tons (15 kgf / cm 2 , per projected area of the molded product) over 1 second, and the pressure was maintained for 80 seconds to cure the coating material.
【００３９】得られた被覆成形品のリブ部の盛り上がり
量は、１．５μｍであり、平滑な表面であった。The raised amount of the rib portion of the obtained coated molded product was 1.5 μm, and the surface was smooth.
【００４０】[0040]
【表１】 [Table 1]
【００４１】[0041]
【発明の効果】本発明の型内被覆方法は、被覆剤注入
後、型締めを所定の多段可変式の型締め圧力及び型締め
圧力移行時間の条件下で行うので、成形品の厚肉部の盛
り上がり現象の発生を部押し出来、高い品質の被覆成形
品を製造できる。According to the in-mold coating method of the present invention, after the coating agent is injected, the mold is clamped under the conditions of a predetermined multi-stage variable mold clamping pressure and a transition time of the mold clamping pressure. Of the swelling phenomenon can be partially suppressed, and a high quality coated molded article can be manufactured.
【図１】射出成形機の構成及びその成形型を示す。FIG. 1 shows a configuration of an injection molding machine and a molding die thereof.
【図２】多段式可変型の型締め圧力、型締め圧力移行時
間及び型締め圧力保持時間条件の例を説明するグラフで
ある。FIG. 2 is a graph illustrating an example of a mold clamping pressure, a mold clamping pressure transition time, and a mold clamping pressure holding time condition of a multi-stage variable type.
１ 型締め装置の固定盤 ２ 型締め装置の可動盤 ３ 固定金型部 ４ 可動金型部 ５ 型締めシリンダ ６ キャビティ ７ 射出シリンダ ８ ノズル ９ スプルー １０ リブ １１ エジェクタピン １２ インジェクタ １２Ａ シャットオフピン １３ 計量シリンダ １３Ａ プランジャー・レギュレータ １４ 被覆剤貯蔵部 １５ 供給ポンプ DESCRIPTION OF SYMBOLS 1 Fixed board of mold clamping device 2 Movable board of mold clamping device 3 Fixed mold part 4 Movable mold part 5 Mold clamping cylinder 6 Cavity 7 Injection cylinder 8 Nozzle 9 Sprue 10 Rib 11 Ejector pin 12 Injector 12A Shut off pin 13 Weighing Cylinder 13A Plunger regulator 14 Coating agent storage unit 15 Supply pump
Claims (3)
プレス成形法による、固定金型部と可動金型部からなる
成形型内で型締め圧力をかけて合成樹脂成形材料を成形
後、その同一成形型内において上記型締め圧を低減し、
あるいは固定金型部と可動金型部を離間して成形型内表
面と得られた成形品の表面との間に被覆剤を注入するこ
と及び再度型締めを行ない乍ら該成形品の表面を該被覆
剤で被覆することによりなる、成形品の型内被覆方法に
おいて、 （１）上記成形品の表面が、被覆剤の注入圧力、流動圧
力に耐えうる程度に硬化または固化した段階で、上記被
覆剤の注入が行われること、 （２）被覆剤注入後の上記再度型締めが所定の多段可変
式の型締め圧力及び型締め圧力移行時間の条件下で実施
されることを特徴とする型内被覆方法。An injection molding method, an injection compression molding method or an injection press molding method, wherein a synthetic resin molding material is molded by applying a mold clamping pressure in a molding die comprising a fixed mold portion and a movable mold portion. Reduce the clamping pressure in the same mold,
Alternatively, the fixed mold portion and the movable mold portion are separated from each other, and a coating agent is injected between the inner surface of the mold and the surface of the obtained molded product. In the in-mold coating method of a molded article, which is coated with the coating agent, (1) at the stage where the surface of the molded article is hardened or solidified so as to withstand the injection pressure and the flow pressure of the coating agent, (2) The mold is characterized in that the mold re-clamping after the coating is injected is performed under the conditions of a predetermined multi-stage variable mold clamping pressure and mold clamping pressure transition time. Inner coating method.
請求項１に記載の型内被覆方法。2. The method according to claim 1, wherein the molding die has a shear edge structure.
型締め圧力移行時間の条件が、初期段階での型締め圧力
が１０ｋｇｆ／ｃｍ2 〜１００ｋｇｆ／ｃｍ 2 （成形品
投影面積当たり）で型締め圧力移行時間が０．５秒〜１
０秒、型締め圧力保持時間が０．５秒〜２０秒であり；
中間段階での型締め圧力が初期段階のそれの２０％〜８
０％で、型締め圧力移行時間が０．１秒〜５秒、型締め
圧力保持時間が０．５秒〜２０秒であり；最終段階の型
締め圧力が初期段階のそれよりは低く、かつ中間段階の
それの４０％〜２００％で、型締め圧力移行時間が０．
１秒〜５秒、型締め圧力保持時間が１秒以上である請求
項１または請求項２に記載の型内被覆方法。3. The predetermined multi-stage variable type clamping pressure and
The condition of the mold clamping pressure transition time depends on the mold clamping pressure in the initial stage.
Is 10kgf / cmTwo~ 100kgf / cm Two(Molding
(Per projected area) 0.5 second to 1
0 seconds, mold clamping pressure holding time is 0.5 seconds to 20 seconds;
The mold clamping pressure in the middle stage is 20% to 8 of that in the initial stage.
0%, mold clamping pressure transition time 0.1 seconds to 5 seconds, mold clamping
Pressure holding time is 0.5-20 seconds; final stage mold
The tightening pressure is lower than that of the initial stage, and
At 40% to 200% of that, the mold clamping pressure transition time is 0.1%.
1-5 seconds, mold clamping pressure holding time is 1 second or more
The in-mold coating method according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1873699A JPH11277577A (en) | 1998-01-27 | 1999-01-27 | Method for coating in mold |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1423998 | 1998-01-27 | ||
| JP10-14239 | 1998-01-27 | ||
| JP1873699A JPH11277577A (en) | 1998-01-27 | 1999-01-27 | Method for coating in mold |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000183278A Division JP2000334800A (en) | 1998-01-27 | 2000-06-19 | Method for coating in mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11277577A true JPH11277577A (en) | 1999-10-12 |
Family
ID=26350149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1873699A Pending JPH11277577A (en) | 1998-01-27 | 1999-01-27 | Method for coating in mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11277577A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001007230A1 (en) * | 1999-07-27 | 2001-02-01 | Dai Nippon Toryo Co., Ltd. | Method of forming coating on inner surfaces of metal mold |
| JP2007190722A (en) * | 2006-01-17 | 2007-08-02 | Koito Mfg Co Ltd | Method for forming coat on surface of synthetic resin lighting implement component and synthetic resin lighting implement component |
| JP2008247045A (en) * | 2002-11-25 | 2008-10-16 | Ube Machinery Corporation Ltd | Molding method of resin molded product, resin molded product, in-mold-coating molding method and in-mold-coated molded product |
| KR20110117095A (en) * | 2009-01-21 | 2011-10-26 | 바이엘 머티리얼사이언스 아게 | Mould and method for producing multi-layer shaped parts of plastic |
-
1999
- 1999-01-27 JP JP1873699A patent/JPH11277577A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001007230A1 (en) * | 1999-07-27 | 2001-02-01 | Dai Nippon Toryo Co., Ltd. | Method of forming coating on inner surfaces of metal mold |
| US7832999B2 (en) | 1999-07-27 | 2010-11-16 | Dai Nippon Toryo Co., Ltd. | Method of forming a coating layer on the surface of a molded product within a mold |
| US7837918B2 (en) | 1999-07-27 | 2010-11-23 | Dai Nippon Toryo Co., Ltd. | Method of forming a coating layer on the surface of a molded product within a mold |
| JP2008247045A (en) * | 2002-11-25 | 2008-10-16 | Ube Machinery Corporation Ltd | Molding method of resin molded product, resin molded product, in-mold-coating molding method and in-mold-coated molded product |
| KR100969694B1 (en) * | 2002-11-25 | 2010-07-14 | 우베 고산 기카이 가부시키가이샤 | In-mold coat-forming method and In-mold-coated mold product |
| US7862758B2 (en) | 2002-11-25 | 2011-01-04 | Ube Machinery Corporation, Ltd. | In-mold coat-forming method |
| JP2007190722A (en) * | 2006-01-17 | 2007-08-02 | Koito Mfg Co Ltd | Method for forming coat on surface of synthetic resin lighting implement component and synthetic resin lighting implement component |
| KR20110117095A (en) * | 2009-01-21 | 2011-10-26 | 바이엘 머티리얼사이언스 아게 | Mould and method for producing multi-layer shaped parts of plastic |
| JP2012515666A (en) * | 2009-01-21 | 2012-07-12 | バイエル・マテリアルサイエンス・アクチェンゲゼルシャフト | Method for producing mold and plastic multilayer molded member |
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