Application of magnetic force to the formation in mold decoration and the IMD film of adhesive layer viscous fluid
| Autor: | Meng-Hsun Tsai, 蔡孟勳 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In the past, electroplating, silk-screen printing, painting and other methods were mostly employed on surface processing of plastic products. However, these processing methods, apart from causing water pollution, air pollution, heavy metal pollution and other environmental problems, would also result in higher production cost due to the secondary processing. Whereas, in-mold decoration (IMD) involves pre-printing of decorative text, color and pattern on a multi-tiered transparent polymer thin film, and planting it in the mold cavity for injection molded along with the plastic piece. It is a technique to allow the plastic to be laminated with a multi-tiered polymer thin film to form a solid model. Such technology is able to simplify and shorten the production process, reduce waste generation, and increase the aesthetic, durability, diversification and versatility of the product. IMD process involves the lamination of polymer thin film with the plastic injection molded piece. It would generate a physical change on the interface that is generally different from traditional single-material injection molding. During the molding process, the complex and not understandable physical and chemical changes it derived would often generate problems and phenomena different from traditional injection molding method. Currently, the IMD process done by the industrial sector has encountered the general problems of insufficient pressure, excessive high temperature and other factors during processing, resulting in ink impact, inadequate lamination, unable to apply in 3D products and other defects. This study has verified the feasibility to utilize magnetic molding in IMD through the generation of a uniform pressure from magnetic field to improve the unfavorable lamination and insufficient strength of IMD products with complicated fringe structure. It also utilizes a lower processing temperature to offset the current high processing temperature that would cause ink impact phenomenon in IMD product. This study has conducted the IMD process through the utilization of a pre-heat temperature on the polymer thin film, holding the compressing time, diameter of magnetized steel ball and other parameters. It has also performed a peel test to study the interface lamination strength between the polymer thin film and the plastic piece in an attempt to verify the feasibility of utilizing magnetic molding in IMD process, and to find out the optimal processing parameters. In addition, This study investigated the effect of capillary number on the embossing process. Computer-aided engineering simulation software was used to predict flow trends of polymer materials within mold cavities during the embossing process. Additionally, visualization of the mold design was employed to conduct real-time observation and recording of deformations in the flow of polymer materials, against which the simulation results were verified. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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