PC/TPU薄膜模內貼合射出成型製程特性之研究

Study of Injection Molding Characteristics for PC/TPU In-mold Decration

黃仁德(Ren-De Hwang)

指導教授 ： 張永鵬 ； 陳夏宗

中原大學/工學院/機械工程研究所/碩士(2003年)

https://doi.org/10.6840/cycu200300579

摘要

3C產業快速發展，塑膠用途與功能越多元化，且因塑料中添加各類纖維，易於表面產生浮纖造成表面品質不良，對模內貼合射出成型而言，雖可利用表面裝飾改善表面品質不良，但生產過程中油墨容易被沖刷掉不利生產效率，所以對成型參數的考量也變得更加重要。故本研究目的於模內貼合射出成型品在成型性、成品表面性量測等方面作一初步之研究。
研究中利用料溫、模溫、射出速度三種製程參數對不同薄膜材質、厚度及油墨種類，探討油墨被沖刷現象與薄膜被拉伸變形。因油墨沖刷現象與射出速度、模溫與料溫於充填時之剪切率有關，因此利用模擬分析中剪切率的變化與實驗中油墨沖刷之現象是否有相同的趨勢，進而提高實驗的正確性，以更符合真正成型的狀況，以期可以找出每個相關參數對實驗結果的影響程度。
在製程參數對油墨被沖刷現象方面，模溫與射出速度的增加，油墨容易被沖刷，而模溫會影響油墨與薄膜接合度；料溫增加，由於固化層的產生速度減緩，且由模流分析得知剪切力相對下降，因此油墨不易被沖刷。在製程參數對薄膜被拉伸變形方面，模溫、射出速度增加，薄膜變形延伸的現象會有增加的趨勢；料溫增加，薄膜變形延伸的現象會有降低的趨勢。在薄膜材質與厚度方面，由於薄膜厚度越薄抗拉強度越低，其拉伸變形會隨著厚度縮減而增加；而薄膜材質方面，軟質薄膜由於其拉伸延展性較好，故於變形較硬質薄膜明顯。

關鍵字

模內貼合 ； 油墨被沖刷 ； 薄膜被拉伸變形

並列摘要

In-mold decoration of injection molding technology is so interesting in Taiwan’s customer because IMD process can provide good surface quality when manufacturing 3C products and automotive plastic parts. The most difficulty in production is that the printed ink in film may be washed out when the molten plastic, is injected to the mold. The present study investigates: (1) effects of injection molding characteristics on ink wash-out during in-mold decoration process including film property, film thickness and ink, and (2) influence of injection molding characteristics on film deformation.
It is found that when mold temperature and injection speed increase, ink in film will be easily washed out. Mold temperature will influence the connectivity between ink and film. As melt temperature increases stress decreases and less ink was washed out. When mold temperature and injection speed increase, film will be easily deformed. As melt temperature increases, film deformation decreases. The film deformation increases with decreased film thickness because the associated tensile strength decreases. Soft film deformed more easily than hard film.

並列關鍵字

film deformation ； In-mold decoration ； ink wash out

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