JP3048279B2 - Method for producing coated resin molded article - Google Patents
Method for producing coated resin molded articleInfo
- Publication number
- JP3048279B2 JP3048279B2 JP17261392A JP17261392A JP3048279B2 JP 3048279 B2 JP3048279 B2 JP 3048279B2 JP 17261392 A JP17261392 A JP 17261392A JP 17261392 A JP17261392 A JP 17261392A JP 3048279 B2 JP3048279 B2 JP 3048279B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- coating material
- resin
- molded product
- resin molded
- 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
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、樹脂成形品製造用の分
割金型内において樹脂成形品を圧縮成形すると共に、該
成形された樹脂成形品の一方側表面に、該分割金型内で
被覆材料を被覆することを要旨とする樹脂成形品の成形
および表面被覆の両工程を含む一貫製造方法に関し、詳
細には被覆材料を所定の厚さで均一に形成することので
きる被覆された樹脂成形品の製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to compression molding of a resin molded product in a split mold for manufacturing a resin molded product, and to forming one side surface of the molded resin molded product in the split mold. The present invention relates to an integrated manufacturing method including both a molding process and a surface coating process for a resin molded article whose purpose is to coat a coating material, and more particularly to a coated resin capable of uniformly forming a coating material with a predetermined thickness. The present invention relates to a method for manufacturing a molded article.
【０００２】[0002]
【従来の技術】合成樹脂製成形材料、例えば熱硬化性樹
脂製シートモールディングコンパウンド（ＳＭＣ）やバ
ルクモールディグコンパウンド（ＢＭＣ）などを所定形
状の成形品として賦形し、さらにその成形品の表面に被
覆材料を被覆する方法の一例としては、次に詳述するイ
ンモールドコーティング法が挙げられる。図２(a) 〜
(c) はこのインモールドコーティング法の一例を示す工
程説明図であり、分割金型である上型１と下型２におい
て、上型１は可動側金型とし上下方向に移動自在に構成
されると共にその一部には被覆材料注入部材４が付設さ
れる。一方下型２は固定側金型とする。前記注入部材４
は上型１内に形成したシリンダ４ｃと、該シリンダ４ｃ
内を上下方向に移動自在なプランジャ４ｂからなり、前
記シリンダ４ｃはその根元側において被覆材料供給管４
ａに接続される。2. Description of the Related Art A molding material made of a synthetic resin, for example, a sheet molding compound (SMC) or a bulk molding compound (BMC) made of a thermosetting resin is shaped as a molded product having a predetermined shape, and further formed on the surface of the molded product. An example of a method of coating the coating material includes an in-mold coating method described in detail below. Fig. 2 (a)-
(c) is a process explanatory view showing an example of the in-mold coating method. In the upper mold 1 and the lower mold 2 which are split molds, the upper mold 1 is configured as a movable mold so as to be movable in the vertical direction. In addition, a coating material injection member 4 is attached to a part thereof. On the other hand, the lower mold 2 is a fixed mold. The injection member 4
Is a cylinder 4c formed in the upper mold 1, and the cylinder 4c
And a plunger 4b movable vertically in the inside of the cylinder 4c.
a.
【０００３】この様な分割金型を使用して被覆済成形品
を製造するに当たっては、まず図２(a) に示す様に下型
２上の所定位置に、あらかじめ所望温度に加熱されたＳ
ＭＣやＢＭＣなどの成形材料Ｓ0 を置き、次いで(b) 図
に示す様に上型１を下降して成形材料Ｓ0 に圧縮力を作
用させてこれを押圧し、下型２と上型１によって形状を
規制しつつ前記成形材料Ｓ0 を半硬化させて仮成形品Ｓ
1 とする。その後前記上型１の押圧力を解除すると共
に、図２(c) に示す様にプランジャ４ｂを押し下げ、シ
リンダ４ｃ内の被覆材料Ｃを仮成形品Ｓ1 の上面と上型
１の下面との間へ注入し、仮成形品Ｓ1 の上面に被覆材
料Ｃを被覆し、次いで再び加圧加熱して仮成形品Ｓ1 と
該被覆材料Ｃが十分硬化したところで分割金型を開き、
被覆された成形品を取出す。In manufacturing a coated molded product using such a split mold, first, as shown in FIG. 2 (a), a pre-heated S
Place the molding material S 0, such as MC and BMC, then (b) by lowering the upper mold 1 as shown in FIG pressing it by applying a compressive force to the molding material S 0, the lower die 2 and the upper die 1 wherein molding the material S 0 semi-cured while regulating the shape by by provisionally molded article S
Set to 1 . Then while releasing the pressing force of the upper mold 1, it depresses the plunger 4b as shown in FIG. 2 (c), the lower surface of the upper surface and the upper mold 1 of the coating material C in the cylinder 4c temporary molded article S 1 The coating material C is coated on the upper surface of the temporary molded product S 1 , and then heated under pressure again to open the split mold when the temporary molded product S 1 and the coating material C are sufficiently hardened,
Remove the coated part.
【０００４】[0004]
【発明が解決しようとする課題】ところが上記図２(c)
の工程において被覆材料Ｃを注入するときは、上型１の
押圧力が完全に解除されているので、被覆材料Ｃの注入
圧力によって上型１が浮き上がってしまうという現象を
引き起こす。この様な現象が生じると、定量的に被覆材
料を供給している場合であっても、該被覆材料は注入位
置の近傍で上型１を過剰に押し上げることになり、金型
空間の末端部まで被覆材料が均一に拡がらず、被覆材料
層の厚さが不均一になってしまうという不具合を生じる
ことがあった。特に被覆材料が熱硬化性樹脂被覆材料の
ような粘度の高いものである場合には、この不具合は顕
著であった。However, FIG. 2 (c)
When the coating material C is injected in the step (1), since the pressing force of the upper mold 1 is completely released, a phenomenon that the upper mold 1 is lifted by the injection pressure of the coating material C is caused. When such a phenomenon occurs, even when the coating material is supplied quantitatively, the coating material excessively pushes up the upper mold 1 near the injection position, and the end portion of the mold space However, the coating material does not spread evenly, and the thickness of the coating material layer becomes uneven. In particular, this problem was remarkable when the coating material had a high viscosity such as a thermosetting resin coating material.
【０００５】そこで本発明の目的は、インモールドコー
ティング法において、被覆材料を成形品の全表面に所定
の厚さで均一に形成被覆された樹脂成形品の製造方法を
提供することにある。An object of the present invention is to provide a method for producing a resin molded article in which a coating material is uniformly formed at a predetermined thickness on the entire surface of the molded article in the in-mold coating method.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成した本発
明は、分割金型１の空間内で樹脂成形品を成形し、該成
形された樹脂成形品の片面側に該分割金型内で被覆材料
層を形成する方法において、分割金型の間で樹脂製成形
材料の圧縮成形を行ったのち、分割金型の型締め圧力を
解除又は軽減し、分割金型の一方側に形成した被覆材料
注入部材を用いて被覆材料の注入を開始しつつ、型締め
圧力を制御しながら金型を所定量移動させた一定位置で
保持することにより、樹脂成形品の表面に均一な被覆を
形成することを要旨とするものである。According to the present invention, which has achieved the above object, a resin molded product is formed in the space of a split mold 1, and one side of the formed resin molded product is formed in the split mold. In the method of forming the coating material layer, after performing compression molding of the resin molding material between the split molds, the mold clamping pressure of the split mold is released or reduced, and the coating formed on one side of the split mold is formed. Forming a uniform coating on the surface of the resin molded product by holding the mold at a fixed position moved by a predetermined amount while controlling the mold clamping pressure while starting the injection of the coating material using the material injection member. The gist is that.
【０００７】[0007]
【作用】本発明においては、成形品の成形後一旦分割金
型の型締め圧力を解除又は軽減した状態で被覆材料の注
入を開始しつつ、型締め圧力を制御しながら分割金型を
所定位置（より正しくは被覆材料が被覆される厚さ分だ
け上昇した位置）に正しく保持することにより、被覆材
料の注入圧力によって分割金型が型開方向へ不均斉に異
常移動するのが防止される。従って被覆材料が成形品表
面へ均一に拡がって一定厚さに形成される。According to the present invention, after the molding of the molded article, the injection of the coating material is started in a state where the mold clamping pressure of the divided mold is once released or reduced, and the divided mold is moved to a predetermined position while controlling the mold clamping pressure. (More correctly, the position raised by the thickness to be coated with the coating material) prevents the split mold from abnormally moving abnormally in the mold opening direction due to the injection pressure of the coating material. . Therefore, the coating material spreads uniformly on the surface of the molded article and is formed to a constant thickness.
【０００８】型締圧力の制御方法としては、金型（図の
例では上型）の位置や圧力等を検知装置によって監視し
たり、或は予め型締圧力と被覆材料の注入圧力との時間
経過関係を調べておき、これらを元にして型締圧力を制
御する。一方被覆材料の注入量については、これを定量
的に供給することが推奨され、前記型締圧力の制御効果
と相まって、一定厚さで均一に拡げられた被覆材料層が
形成される。As a method of controlling the mold clamping pressure, the position and pressure of the mold (upper mold in the example in the figure) are monitored by a detecting device, or the time between the mold clamping pressure and the injection pressure of the coating material is previously determined. The process relationship is checked, and the mold clamping pressure is controlled based on the relationship. On the other hand, it is recommended that the injection amount of the coating material be supplied quantitatively, and the coating material layer having a uniform thickness and a uniform thickness is formed in combination with the control effect of the mold clamping pressure.
【０００９】[0009]
【実施例】図１の(a) 〜(d) は本発明方法の工程順序を
示す説明図であり、分割金型及び被覆材料注入部材４等
は図２に示した従来例と同様のものを使用する。図１の
(a),(b) に示す様に上型１と下型２の間で仮成形品Ｓ1
を成形したのち、(c) に示す様に一旦上型１の押圧々力
を解除又は軽減し、注入部材４により被覆材料Ｃを仮成
形品Ｓ1 の上面と上型１の下面の間に注入し始める。こ
の被覆材料Ｃの注入によって上型１は持ち上げられる
が、この際レベリング装置により４方均一に上昇（すな
わち均一厚さ上昇）するようにする。上昇高さが所定値
に達したことを例えばリミットスイッチ５によって検知
すると、この検知に基き上型２に再び押圧力を作用し、
上型１がそれ以上持ち上げられない様にする。この上型
１の押圧力は被覆材料の注入圧力と平衡する値とし、被
覆材料の単位注入圧力と被覆材料添設面積及び上型重量
等によって設定する。なお上型１の押圧力の制御手段と
しては、上記の他複数本の押圧用シリンダを設け、該シ
リンダ内の圧力を他の検知手段によって検出し、これに
基いて各押圧用シリンダの押圧力をバランスさせて制御
する方法等であっても良い。1 (a) to 1 (d) are explanatory views showing the sequence of steps in the method of the present invention. The split mold and the coating material injection member 4 are the same as those in the conventional example shown in FIG. Use Of FIG.
As shown in (a) and (b), a temporary molded product S 1 is placed between the upper die 1 and the lower die 2.
After molding, the pressing Todoroki of the upper die 1 release or reduced once as shown (c), the by infusion member 4 the coating material C between the lower surface of the upper surface and the upper mold 1 of the preformed article S 1 Start injecting. The upper die 1 is lifted by the injection of the coating material C. At this time, the upper die 1 is raised uniformly in four directions (that is, the uniform thickness is increased) by the leveling device. When it is detected, for example, by the limit switch 5 that the rising height has reached a predetermined value, the pressing force is applied again to the upper mold 2 based on this detection,
The upper mold 1 is prevented from being lifted any more. The pressing force of the upper mold 1 is set to a value that balances the injection pressure of the coating material, and is set based on the unit injection pressure of the coating material, the coating material application area, the upper mold weight, and the like. In addition, a plurality of pressing cylinders other than those described above are provided as control means for the pressing force of the upper mold 1, and the pressure in the cylinder is detected by other detecting means, and based on this, the pressing force of each pressing cylinder is determined. Or a method of controlling the balance.
【００１０】そして図１の(d) に示す様に上記平衡状態
を保持しつつ仮成形品Ｓ1 および被覆材料Ｃの完全硬化
を待ち、その後脱型する。[0010] Then while maintaining the equilibrium as shown in FIG. 1 (d) wait for complete hardening of the temporary molded product S 1 and the coating material C, and then removed from the mold.
【００１１】図３は本発明における金型（上型１）位置
の変化（ａ）と型締め圧力（ｂ）の変化の対応を示すも
のであり、（ａ），（ｂ）共に横軸を時間の経過で表
す。図（ａ），（ｂ）を対比して検討すれば明らかであ
る様に、型締め圧力の上昇と共に上型が降下し、成形素
材を十分圧縮した時点で上型が少し上に戻るが、その後
型締め圧力が最高の値を示している間は上型が低い一定
位置を保つ。そしてその位置で型締め圧力を維持してい
るうちにやがて硬化収縮が起こり始めると、上型が若干
下降傾向を示す。その時点で型締め圧力を急激に下げて
いったん零にすると共に、流動性被覆材料を注入すると
上型が若干上昇する。その時点で再び型締め圧力を高め
て一定の圧力に維持し続ければ上型の位置も一定に維持
され、成形用樹脂素材及び流動性被覆材料の硬化が進行
する、そしてこれらの硬化を待って型締め圧力をゆる
め、上型を上昇させて脱型する。FIG. 3 shows the correspondence between the change (a) in the position of the mold (upper mold 1) and the change in the mold clamping pressure (b) in the present invention. Both (a) and (b) show the horizontal axis. Expressed over time. As is clear from the comparison of FIGS. (A) and (b), as the upper mold lowers with the increase of the mold clamping pressure, the upper mold returns slightly upward when the molding material is sufficiently compressed. Thereafter, while the mold clamping pressure shows the highest value, the upper mold maintains a low constant position. Then, when the curing shrinkage starts to occur while the mold clamping pressure is maintained at that position, the upper mold slightly shows a downward tendency. At that time, the mold clamping pressure is rapidly reduced to zero, and when the fluid coating material is injected, the upper mold slightly rises. At that time, if the mold clamping pressure is increased again and kept at a constant pressure, the position of the upper mold is also kept constant, and the curing of the molding resin material and the fluid coating material progresses. Release the mold clamping pressure and raise the upper mold to release the mold.
【００１２】（実施例Ａ）成形用樹脂材料としてＳＭＣ
を用い、厚さ４mmの平板（1000×650mm ）を分割金型に
よって成形し、図１に示す様な被覆材料注入部材４によ
り成形品表面にエポキシメタクリレート樹脂系被覆材料
を被覆形成することとした。(Example A) SMC as a molding resin material
Then, a flat plate (1000 × 650 mm) having a thickness of 4 mm is formed by a split mold, and the surface of the molded product is coated with an epoxy methacrylate resin-based coating material by a coating material injection member 4 as shown in FIG. .
【００１３】このとき金型温度は140 ℃とし、樹脂材料
成形時の金型圧力は１００kg/cm2とし、一旦上型１の圧
力を開放した後、被覆材料を注入し、その後金型圧力を
５０kg/cm2とした。At this time, the mold temperature is set at 140 ° C., the mold pressure during molding of the resin material is set at 100 kg / cm 2 , the pressure of the upper mold 1 is once released, the coating material is injected, and then the mold pressure is increased. It was 50 kg / cm 2 .
【００１４】成形工程、被覆工程、更に再加熱加圧工程
を完了した後の成形品について、その被覆材料層の厚さ
を成形品全面について調べたところ、平均値±２０μm
であり、均一な被覆材料層が形成され、且つ該被覆材料
層表面にはひび割れや樹脂溜り等の欠陥はなく美麗なも
のとなっていた。When the thickness of the coating material layer of the molded article after the completion of the molding step, the coating step, and the reheating and pressurizing step was examined over the entire molded article, the average value was ± 20 μm.
Thus, a uniform coating material layer was formed, and the surface of the coating material layer was beautiful without defects such as cracks and resin pools.
【００１５】本発明方法に使用される成形用樹脂材料は
上記例のものに限られず、バルクモールディングコンパ
ウンドや、液状樹脂と補強材の組み合わせ等を使用する
ことができ、また被覆材料としては、不飽和ポリエステ
ル樹脂、エポキシ（メタ）アクリレート樹脂、ウレタン
（メタ）アクリレート樹脂、ウレタン樹脂、エポキシ樹
脂やその他の混合物が挙げられ、充填剤などの添加物を
添加したものであっても良い。The molding resin material used in the method of the present invention is not limited to the above examples, and bulk molding compounds, a combination of a liquid resin and a reinforcing material, and the like can be used. Examples thereof include a saturated polyester resin, an epoxy (meth) acrylate resin, a urethane (meth) acrylate resin, a urethane resin, an epoxy resin, and other mixtures, and may include additives such as a filler.
【００１６】また成形用分割金型としては、任意形状の
賦形空間を形成したものが適用され、さらに被覆材料の
注入手段及び方法も上記例に限られず、下型から注入す
るもの、或は成形品を貫通してその裏側又は表側へ注入
を行なうもの等であっても良い。また上型を固定式、下
型を可動式としてもよい。As the split mold for molding, a mold having a shaping space of an arbitrary shape is applied, and the means and method for injecting the coating material are not limited to the above examples. It may be one that penetrates the molded article and injects it into the back side or the front side. The upper mold may be fixed and the lower mold may be movable.
【００１７】[0017]
【発明の効果】本発明は以上の様に構成されているの
で、樹脂成形品の表面に均一厚さの被覆材料層を形成で
きる様になった。As described above, according to the present invention, a coating material layer having a uniform thickness can be formed on the surface of a resin molded product.
【図１】（ａ）〜（ｄ）は本発明方法の工程順序を示す
説明図である。1 (a) to 1 (d) are explanatory diagrams showing a process sequence of a method of the present invention.
【図２】（ａ）〜（ｃ）は従来方法における工程順序を
示す説明図である。FIGS. 2A to 2C are explanatory views showing the order of steps in a conventional method.
【図３】本発明における金型位置の変化（ａ）と型締め
圧力（ｂ）の変化の対応を示す図である。FIG. 3 is a diagram showing a correspondence between a change in a mold position (a) and a change in a mold clamping pressure (b) in the present invention.
１ 上型 ２ 下型 ４ 被覆材料注入部材 1 upper mold 2 lower mold 4 coating material injection member
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｂ２９Ｌ 9:00 (72)発明者 牧 義和 大阪府吹田市西御旅町５番８号 株式会 社日本触媒 樹脂技術研究所内 (72)発明者 岡 茂 大阪府吹田市西御旅町５番８号 株式会 社日本触媒 樹脂技術研究所内 (56)参考文献 特開 昭63−28614（ＪＰ，Ａ) 特開 平１−216814（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 43/00 - 43/58 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification FIB29L 9:00 (72) Inventor Yoshikazu Maki 5-8 Nishiburi-cho, Suita-shi, Osaka Japan Resin Technology Research Institute ( 72) Inventor Shigeru Oka 5-8, Nishimitabi-cho, Suita-shi, Osaka Inside of the Japan Catalyst Resin Research Institute Co., Ltd. (56) References JP-A-63-28614 (JP, A) JP-A-1-216814 (JP) , A) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 43/00-43/58
Claims (1)
てこれを圧縮することにより樹脂成形品を成形し、該成
形された樹脂成形品の片面側に該分割金型内で被覆材料
層を形成する方法において、 分割金型の間で樹脂製成形材料の圧縮成形を行ったの
ち、分割金型の型締圧力を解除又は軽減し、分割金型の
一方側に形成した被覆材料注入部材を用いて被覆材料の
注入を開始しつつ、型締圧力を制御し、金型を所定量移
動させた一定位置で保持することにより、樹脂成形品の
表面に均一な被覆を形成することを特徴とする被覆され
た樹脂成形品の製造方法。1. A resin molding material is arranged between divided molds and compressed to form a resin molded product, and one side of the molded resin molded product is covered in the divided mold. In the method of forming a material layer, after performing compression molding of a resin molding material between divided molds, the mold clamping pressure of the divided mold is released or reduced, and a coating material formed on one side of the divided mold is formed. Forming a uniform coating on the surface of the resin molded product by controlling the mold clamping pressure and holding the mold at a fixed position by moving the mold by a predetermined amount while starting the injection of the coating material using the injection member. A method for producing a coated resin molded product, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17261392A JP3048279B2 (en) | 1992-06-30 | 1992-06-30 | Method for producing coated resin molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17261392A JP3048279B2 (en) | 1992-06-30 | 1992-06-30 | Method for producing coated resin molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0615670A JPH0615670A (en) | 1994-01-25 |
| JP3048279B2 true JP3048279B2 (en) | 2000-06-05 |
Family
ID=15945126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17261392A Expired - Fee Related JP3048279B2 (en) | 1992-06-30 | 1992-06-30 | Method for producing coated resin molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3048279B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2725233B2 (en) * | 1994-01-13 | 1998-03-11 | 誠一 北林 | Golf grip, method of manufacturing golf grip, method of attaching golf grip to golf club, and method of removing golf grip from golf club |
-
1992
- 1992-06-30 JP JP17261392A patent/JP3048279B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0615670A (en) | 1994-01-25 |
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