液晶玻璃密集式包裝箱厚度與落摔強度關係之研究

A study about the relationship between the drop test and the thickness of EPP dense box in TFT-LCD

張文元(Wen-Yuan Chang)

指導教授 ： 陳仁浩

國立交通大學/工學院/工學院精密與自動化工程學程/碩士(2012年)

https://doi.org/10.6842/NCTU.2012.00264

摘要

在整個3C產品的發展上，從之前的厚實穩固的面貌中發展成輕、薄、短、小與外觀美觀的特性。在產品的使用應用上，最重要的莫過於是其中的液晶顯示裝置。然而液晶玻璃在特性上是屬於不耐衝擊與碰撞，容易發生裂痕與破裂，因此需要以包裝來適度保護與防範撞擊造成的傷害。
本研究的目的係以現行包裝方式進行實驗與搭配透過軟體分析，找到現行包裝方式的問題點，並加以改善、節省包裝的浪費與效率提昇。其方法係以現行包裝液晶玻璃的包裝方式設計來進行，以液晶玻璃裝載箱發生的損壞狀況來討論，搭配實際產品落摔實驗進行確認，以找到使液晶玻璃發生破壞的衝擊力與相對應的包裝容器厚度之間的對應值，並透過電腦輔助工程軟體進行產品模擬，來確認軟體的分析方式與設定參數定義正確。
研究結果顯示經軟體分析出來之結果可與實際產品落摔實驗的回饋數值資料相吻合，在落摔的角度差異上，會影響應力的變化；另外在實體落摔與模擬的結果也都顯示出具有特徵的箱體有較佳的緩衝效果與保護性，因此在箱體設計上應該具備此項特徵，可讓箱體厚度效益得到改善，並在經過此驗證後而得到一個理想建議設計值。
本研究目前所得到的結論，在有限元素模型上已經可以蠻準確分析與預測EPP裝載箱的應力值，使設計人員可以找出問題點並加以改善，接下來進一步也可利用有限元素模型的分析結果，在設計期初參考其數值，改善設計流程，進而來降低設計成本與材料使用量並有效縮短開發時間，增加開發效能與降低後續發生問題的機率。

關鍵字

液晶玻璃裝載箱 ； 包裝方式 ； 落摔實驗

並列摘要

The development of 3C products has evolved from a bulky, solid appearance into one that is light, thin, short, small, and beautiful. The position and installment of the LCD display is the most critical aspect for the application and usage of the product. However, LCD glass is susceptible to impacts, which can cause cracks or ruptures and breaks. Therefore, appropriate packaging is necessary to protect and prevent damages caused by impacts.
This study conducted experiments using current packaging with software analysis to identify the shortcomings in current packaging methods and to recommend improvements and savings methods regarding packaging waste and enhancing packaging efficiency. We employed packaging design currently used to package LCD glass and examined the degree of damage for LCD containers. An actual product drop experiment was also used for verification to find the corresponding values between the impact forces that can cause damage and the thickness of the LCD packaging container. In addition, we conducted product simulations using computer-aided engineering software to ensure that the correct software analysis method and parameter definitions were used.
This study’s findings showed that the software analysis results were consistent with the feedback value data obtained from the actual product drop test in that different drop angles would influence stress changes. Both the actual drop and simulated tests indicated that containers with special features provided a better buffer effect and protection. Therefore, containers should be equipped with such special features to improve the effectiveness of the container thickness. This study also identified the ideal suggested design values for the containers through verification.
The conclusion of this study is that it is possible to accurately analyze and predict the stress values of the EPP containers with the finite element model. Consequently, design personnel can use this phenomenon to find problem points and enact improvements. The analysis results from the finite element model and relevant values can also be employed at the preliminary design phase to improve the design process, reduce design costs and material usage volume, shorten development time, increase development efficacy, and to reduce the probability of follow-up problems.

並列關鍵字

package LCD glass ； packaging methods ； drop test

參考文獻

[8] 江瑞琪，「以EPP緩衝包材包覆之液晶單元落下試驗與數值模擬」，國立台灣大學土木工程學研究所碩士論文，2007年。

[11] 劉俊男，「產品包裝之可靠度實驗分析」，中原大學機械工程研究所碩士論文，2006年。

[25] Mindlin, R. D., “Dynamics of Package Cushioning,” Bell System Technical Journal, Vol. 24, No. 3-4, 1945.

[29] Wang, Z. W., Hu, C. Y., “Shock Spectra and Damage Boundary Curves for Non-linear Package Cushioning Systems,” Packaging Technology and Science, Vol. 12, No. 5, pp. 207-217, 1999.

[34] ASTM Standard, D 4169-99,“Standard Practice for Performance Testing of Shipping Containers and Systems”, 1999.