JP3107330B2 - Method for manufacturing resin molded products - Google Patents
Method for manufacturing resin molded productsInfo
- Publication number
- JP3107330B2 JP3107330B2 JP17648192A JP17648192A JP3107330B2 JP 3107330 B2 JP3107330 B2 JP 3107330B2 JP 17648192 A JP17648192 A JP 17648192A JP 17648192 A JP17648192 A JP 17648192A JP 3107330 B2 JP3107330 B2 JP 3107330B2
- Authority
- JP
- Japan
- Prior art keywords
- resin molded
- resin
- molding
- mold
- coating material
- 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
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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/34—Feeding the material to the mould or the compression means
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
- B29C43/146—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps for making multilayered articles
Description
【０００１】[0001]
【産業上の利用分野】本発明は、樹脂成形体の表面にイ
ンモールドコーティングを行い、表面品質が向上した樹
脂成形品を得るための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 a method for performing in-mold coating on the surface of a resin molded product to obtain a resin molded product having improved surface quality.
【０００２】[0002]
【従来の技術】インモールドコーティング法は成形樹脂
の成形と同じ工程で樹脂成形体の表面にコーティングを
行う方法である。そして、従来においては、成形型を完
全に開いてコーティング材である成形樹脂を成形型に注
入する方法や、成形型を閉じたままコーティング材を注
入する方法が特公昭５５ー９２９１号公報により知られ
ており、また、成形型を加圧したままで高圧でコーティ
ング材を成形型に注入する方法が特開昭６１ー２７３９
２１号公報により知られている。2. Description of the Related Art The in-mold coating method is a method in which the surface of a resin molded product is coated in the same process as the molding of a molding resin. Conventionally, a method of injecting a molding resin as a coating material into a mold by completely opening the mold and a method of injecting a coating material with the mold closed are known from Japanese Patent Publication No. 55-9291. A method of injecting a coating material into a mold at a high pressure while the mold is being pressed is disclosed in Japanese Patent Application Laid-Open No. 61-2739.
No. 21 is known.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
従来例にあっては、樹脂成形品の端部において気泡が残
り、コーティング材の充填不良が発生するという問題が
あった。本発明は上記の従来例の問題点に鑑みて発明し
たものであって、その目的とするところは、樹脂成形品
を製造するに当たり、端部において気泡が残ることがな
く、コーティング材の充填不良を無くして、樹脂成形品
の表面品質を良好にすることができる樹脂成形品の製造
方法を提供するにある。However, in the above-mentioned conventional example, there is a problem that air bubbles remain at the end of the resin molded product, and a defective filling of the coating material occurs. The present invention has been made in view of the above-mentioned problems of the conventional example, and an object thereof is to produce a resin molded product without bubbles remaining at an end portion, and imperfect filling of a coating material. It is an object of the present invention to provide a method for producing a resin molded product which can improve the surface quality of the resin molded product by eliminating the problem.
【０００４】[0004]
【課題を解決するための手段】上記した従来例の問題点
を解決して本発明の目的を達成するため、本発明の樹脂
成形品の製造方法は、第１の成形型１と、第１の成形型
１に対して可動となった第２の成形型２とにより空間３
を設け、この空間３内で成形樹脂４ａを圧縮成形して樹
脂成形体４を形成し、その後、該樹脂成形体４表面にコ
ーティング材５ａを注入し、再び圧縮成形することによ
ってコーティング層５を形成する方法において、コーテ
ィング材５ａの注入時に樹脂成形体４の端部に設けた分
割型６と樹脂成形体４との間に空間６ａを設け、注入さ
れたコーティング材５ａを該空間６ａ内に流入させるこ
とを特徴とするものである。In order to solve the above-mentioned problems of the prior art and achieve the object of the present invention, the method for manufacturing a resin molded product of the present invention comprises a first molding die 1 and a first molding die 1. The space 3 is formed by the second mold 2 movable with respect to the mold 1
The molding resin 4a is compression-molded in the space 3 to form a resin molded body 4. Thereafter, a coating material 5a is injected into the surface of the resin molded body 4 and compression-molded again to form the coating layer 5. a method of forming a space 6a is provided between the split 6 and the resin molded body 4 provided at an end portion of the resin molded body 4 during the injection of the coating material 5a, injection of
Is a coating material 5a to flow into the space inside 6a has is characterized in Rukoto.
【０００５】[0005]
【作用】上記のような方法の本発明によれば、樹脂成形
品Ａを成形するに当たり、コーティング層５を形成する
ためのコーティング材５ａの注入時に樹脂成形体４の端
部に設けた分割型６と樹脂成形体４との間に空間６ａを
設け、該空間６ａに上記コーティング材５ａを回り込ま
せるので、気泡が分割型６と樹脂成形体４との間の空間
６ａに逃れ、このことにより、樹脂成形体４の表面側に
気泡が残らず、コーティング材５ａを確実に充填できて
充填不足を無くすことができるようになったものであ
る。According to the method of the present invention as described above, in molding the resin molded article A, the split mold provided at the end of the resin molded body 4 when the coating material 5a for forming the coating layer 5 is injected. A space 6a is provided between the mold 6 and the resin molding 4, and the coating material 5a is wrapped around the space 6a.
6a , so that no air bubbles remain on the surface side of the resin molded body 4, the coating material 5a can be reliably filled, and insufficient filling can be eliminated.
【０００６】[0006]
【実施例】図１には本発明の金型装置の一例の概略説明
図が示してあり、図３乃至図１１には本発明の一実施例
の製造順序が示してある。金型装置は、下金型となる第
１の成形型１と上金型となる第２の成形型２とで構成し
てあり、添付図面に示す実施例では第１の成形型１は固
定型であり、第２の成形型２は可動型であって、油圧シ
リンダーのようなシリンダー装置７により第２の成形型
２が上下方向に移動するようになっている。図中２０は
プレスラム、２１は圧力制御バルブ、２２はポンプ、２
３はプレス圧力コントローラ、２４は金型変位計であ
る。第１の成形型１には成形樹脂注入口８が設けてあ
り、コーティング材５ａを注入シリンダのようなコーテ
ィング材供給装置９により成形樹脂注入口８から注入で
きるようになっている。図中２５はタンク、２６は注入
シリンダのストローク検出装置、２７は流量制御バル
ブ、２８は圧力制御バルブ、２９はポンプである。成形
樹脂注入口８には開閉弁１０が設けてある。また、成形
される樹脂成形品Ａの端部に対応する部分の第２の成形
型２の下面には分割型６が設けてあり、この分割型６は
油圧シリンダー１２により上下方向に移動自在となって
いる。FIG. 1 is a schematic explanatory view of an example of a mold apparatus according to the present invention, and FIGS. 3 to 11 show a manufacturing sequence of an embodiment of the present invention. The mold apparatus includes a first mold 1 serving as a lower mold and a second mold 2 serving as an upper mold. In the embodiment shown in the accompanying drawings, the first mold 1 is fixed. The second molding die 2 is a movable die, and the second molding die 2 is vertically moved by a cylinder device 7 such as a hydraulic cylinder. In the figure, 20 is a press ram, 21 is a pressure control valve, 22 is a pump, 2
3 is a press pressure controller, and 24 is a mold displacement gauge. The first molding die 1 is provided with a molding resin injection port 8, and the coating material 5a can be injected from the molding resin injection port 8 by a coating material supply device 9 such as an injection cylinder. In the figure, 25 is a tank, 26 is a stroke cylinder stroke detecting device, 27 is a flow control valve, 28 is a pressure control valve, and 29 is a pump. An opening / closing valve 10 is provided at the molding resin inlet 8. A split mold 6 is provided on the lower surface of the second molding die 2 at a portion corresponding to the end of the resin molded product A to be molded, and the split mold 6 can be moved vertically by a hydraulic cylinder 12. Has become.
【０００７】しかして、上記のような構成の金型装置を
用いて箱型の樹脂成形体４の表面にコーティング層５を
有する樹脂成形品Ａを製造するに当たっては、次のよう
に行うものである。すなわち、まず、図３のように第２
の成形型２を上昇させて空間３を形成し、この状態で、
樹脂成形体４の材料である成形樹脂４ａを第１の成形型
１の上に載せる。ここで成形樹脂４ａとしては繊維強化
熱硬化樹脂が用いられ、不飽和ポリエステル樹脂等に炭
酸カルシウムや水酸化アルミニウムなどの充填剤、ガラ
ス繊維や炭素繊維などの繊維状補強材、必要に応じて増
粘剤、着色剤などを配合したものでＢＭＣ（バルク・モ
ールディング・コンパウンド）やＳＭＣ（シート・モー
ルディング・コンパウンド）等として第１の成形型１の
上に載設して供給される。次に、図４のように第２の成
形型２を下降させて型締めして成形樹脂４ａを加圧圧縮
し、樹脂成形体４を成形する。次に、図５のように第２
の成形型２を僅かに上昇させ、樹脂成形体４の表面と第
１の成形型１との間に僅かな隙間を形成し、次に、図６
のように分割型６を上昇させて樹脂成形体４の端部と分
割型６との間に空間６ａを形成する。図７に樹脂成形体
４の端部と分割型６との間に形成した空間部分の拡大図
が示してある。次に、図８のように開閉弁１０を開いて
不飽和ポリエステル系、ビニルエステル系、エポキシ
系、アクリル系等の樹脂あるいはこれらの樹脂を混合し
た樹脂よりなる成形樹脂を例とするコーティング材５ａ
をコーティング材供給装置９により成形樹脂注入口８か
ら樹脂成形体４の表面側と第１の成形型１との間の僅か
な隙間に注入するものである。この場合、気泡が発生し
ていても樹脂成形体４の端部と分割型６との間の空間６
ａに流れ、また、この部分にも図９、図１０に示すよう
にコーティング材５ａが回り込むものである。コーティ
ング材５ａの注入が完了して再圧縮成形が完了すると図
１１のように第２の成形型２を上昇させて型開きを行
い、この状態で樹脂成形品Ａを取り出すものである。添
付図面に示す実施例では樹脂成形品Ａとして浴槽の例が
示してある。しかして製造された浴槽は容器状の樹脂成
形体４の表面には気泡の発生が見られないものであり、
気泡の発生があっても、これは容器状の樹脂成形体４の
フランジ部の裏面側に発生することになり、商品価値を
低下させることがないものである。ところで、上記製造
においては、金型装置の金型温度は１４０℃にして図３
乃至図１１の工程で成形するものである。[0007] The production of the resin molded product A having the coating layer 5 on the surface of the box-shaped resin molded product 4 using the mold apparatus having the above configuration is performed as follows. is there. That is, first, as shown in FIG.
Is raised to form a space 3, and in this state,
A molding resin 4 a, which is a material of the resin molding 4, is placed on the first molding die 1. Here, a fiber-reinforced thermosetting resin is used as the molding resin 4a, and a filler such as calcium carbonate or aluminum hydroxide, a fibrous reinforcing material such as glass fiber or carbon fiber is added to an unsaturated polyester resin or the like. A mixture containing a tackifier, a colorant, and the like is supplied on the first mold 1 as a BMC (bulk molding compound), an SMC (sheet molding compound), or the like. Next, as shown in FIG. 4, the second molding die 2 is lowered and clamped to compress the molding resin 4 a to form the resin molded body 4. Next, as shown in FIG.
6 is slightly raised to form a slight gap between the surface of the resin molded body 4 and the first molding die 1.
As described above, the split mold 6 is raised to form a space 6a between the end of the resin molded body 4 and the split mold 6. FIG. 7 is an enlarged view of a space formed between the end of the resin molded body 4 and the split mold 6. Next, as shown in FIG. 8, the on-off valve 10 is opened to open a coating material 5a, for example, a molding resin made of an unsaturated polyester-based, vinyl ester-based, epoxy-based, acrylic-based resin, or a mixture of these resins.
Is injected from the molding resin injection port 8 into a slight gap between the surface side of the resin molded body 4 and the first molding die 1 by the coating material supply device 9. In this case, even if bubbles are generated, the space 6 between the end of the resin molded product 4 and the split mold 6 is formed.
a, and the coating material 5a wraps around this portion as shown in FIGS. When the injection of the coating material 5a is completed and the recompression molding is completed, the second molding die 2 is raised to open the mold as shown in FIG. 11, and the resin molded product A is taken out in this state. In the embodiment shown in the attached drawings, an example of a bathtub is shown as the resin molded product A. In the bathtub thus manufactured, no bubbles are observed on the surface of the container-shaped resin molded body 4.
Even if air bubbles are generated, they are generated on the back side of the flange portion of the container-shaped resin molded body 4, and do not reduce the commercial value. By the way, in the above manufacturing, the mold temperature of the mold apparatus is set to 140 ° C.
Through the steps shown in FIGS.
【０００８】[0008]
【発明の効果】本発明にあっては、上述のように、コー
ティング材の注入時に樹脂成形体の端部に設けた分割型
と樹脂成形体との間に空間を設け、注入されたコーティ
ング材を該空間内に流入させるので、コーティング材が
分割型と樹脂成形体との間の空間に注入される際、樹脂
成形体の表面側と第１の成形型との間の隙間の空気を確
実にこの空間に追い出すことができ、このことにより、
樹脂成形体の表面側に気泡が残らず、コーティング材を
確実に充填できて充填不足を無くすことができるもので
あり、表面に気泡跡などのない表面品質が良好な樹脂成
形品を製造することができるものである。In the present invention, as described above, the space provided between the split mold and the resin molded body provided at an end portion of the resin molded body at the time of injection of the coating material, which is injected Koti
When Runode allowed to flow into ring material in the space, the coating material is injected into the space between the <br/> split and the resin molded body, the resin
Check the air in the gap between the surface of the compact and the first mold.
You can really get out of this space ,
No air bubbles remain on the surface side of the resin molded body, the coating material can be filled securely and the lack of filling can be eliminated, and a resin molded product with good surface quality with no air bubble marks on the surface is to be manufactured. Can be done.
【図１】本発明の製造方法に用いる成形金型の説明図で
ある。FIG. 1 is an explanatory view of a molding die used in the production method of the present invention.
【図２】同上の分割型部分の拡大断面図である。FIG. 2 is an enlarged sectional view of a split mold part according to the first embodiment;
【図３】本発明の製造順序を示す説明図である。FIG. 3 is an explanatory view showing a manufacturing order of the present invention.
【図４】同上の製造順序を示す説明図である。FIG. 4 is an explanatory view showing a manufacturing order according to the embodiment.
【図５】同上の製造順序を示す説明図である。FIG. 5 is an explanatory view showing a manufacturing order according to the embodiment.
【図６】同上の製造順序を示す説明図である。FIG. 6 is an explanatory view showing a manufacturing order of the above.
【図７】図６の段階における分割型部分の拡大断面図で
ある。FIG. 7 is an enlarged sectional view of a split mold portion at the stage of FIG.
【図８】本発明の製造順序を示す説明図である。FIG. 8 is an explanatory diagram showing a manufacturing order of the present invention.
【図９】同上の製造順序を示す説明図である。FIG. 9 is an explanatory diagram showing a manufacturing order according to the embodiment.
【図１０】図９の段階における分割型部分の拡大断面図
である。FIG. 10 is an enlarged sectional view of a split mold portion at the stage of FIG. 9;
【図１１】本発明の製造順序を示す説明図である。FIG. 11 is an explanatory view showing a manufacturing order of the present invention.
１ 第１の成形型 ２ 第２の成形型 ３ 空間 ４ 樹脂成形体 ４ａ 成形樹脂 ５ コーティング層 ５ａ コーティング材 ６ 分割型 ６ａ 空間 DESCRIPTION OF SYMBOLS 1 1st shaping | molding die 2 2nd shaping | molding die 3 space 4 resin molded body 4a molding resin 5 coating layer 5a coating material 6 division | segmentation type 6a space
───────────────────────────────────────────────────── フロントページの続き (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 (56)参考文献 実開 平２−59912（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 43/00 - 43/58 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshikazu Maki, Inventor 5-8, Nishiomitabi-cho, Suita-shi, Osaka Inside the Resin Research Institute of Japan, Ltd. (56) References Japanese Utility Model No. 2-59912 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B29C 43/00-43/58
Claims (1)
可動となった第２の成形型とにより空間を設け、この空
間内で成形樹脂を圧縮成形して樹脂成形体を形成し、そ
の後、該樹脂成形体表面にコーティング材を注入し、再
び圧縮成形することによってコーティング層を形成して
樹脂成形品を製造する方法において、コーティング材の
注入時に樹脂成形体の端部に設けた分割型と樹脂成形体
との間に空間を設け、注入されたコーティング材を該空
間内に流入させることを特徴とする樹脂成形品の製造方
法。A space is provided by a first molding die and a second molding die movable with respect to the first molding die, and a molding resin is compression-molded in this space to form a resin molding. In the method of manufacturing a resin molded article by forming a coating layer on the surface of the resin molded body, then injecting a coating material on the surface of the resin molded body, and then compressing and molding again, the coating material is injected into an end of the resin molded body at the time of injection. A space is provided between the provided split mold and the resin molded body, and the injected coating material is removed from the space.
Method for producing a resin molded article, characterized in Rukoto flowed into between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17648192A JP3107330B2 (en) | 1992-07-03 | 1992-07-03 | Method for manufacturing resin molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17648192A JP3107330B2 (en) | 1992-07-03 | 1992-07-03 | Method for manufacturing resin molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0615668A JPH0615668A (en) | 1994-01-25 |
| JP3107330B2 true JP3107330B2 (en) | 2000-11-06 |
Family
ID=16014425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17648192A Expired - Fee Related JP3107330B2 (en) | 1992-07-03 | 1992-07-03 | Method for manufacturing resin molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3107330B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4921958B2 (en) * | 2006-12-27 | 2012-04-25 | クリナップ株式会社 | Unit bath floor panel structure and manufacturing method thereof |
-
1992
- 1992-07-03 JP JP17648192A patent/JP3107330B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0615668A (en) | 1994-01-25 |
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