研究熱澆道接合澆口幾何設計對於熔膠斷點溫度之影響

Study of Interfacial Gate in Hot Runner Tip on the Influence of Broken Temperature of Melt

劉義福(Yi-fu Liu)

指導教授 ： 陳夏宗

中原大學/工學院/機械工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600082

摘要

在熱澆道系統中，可分為開放式熱澆道及閥式熱澆道，其中開放式熱澆道的價格較便宜，而且較為簡單。然而開放式熱澆道最常見的問題就是澆口處容易拉絲，導致連續生產時會有不良品及無法連續生產的情況發生，因此開放式熱澆道的澆口溫度控制相當重要。
現今開放式熱澆道消除拉絲的主要方法是將熱嘴內部放入內針，使澆口處因內針的影響而消除拉絲的情況，因為內針的影響會使得塑料分流，而導致產品會有結合線的產生。當產品為導光板時，是不容許有結合線的產生，利用塑料對溫度的特性，將澆口處的溫度控制在塑料介於橡膠態的情況下，使其不易拉絲也亦不會堵住澆口。
本研究以100mm熱嘴為基礎，針對熱嘴的澆口溫度進行研究分析，在三種不同的澆口位置安裝感溫裝置，利用不同的熱澆道溫度、成型機料管溫度、模具溫度在持續生產的況下，對於澆口的溫度變化進行記錄，並且觀察產品的澆口處所產生的情況(是否有拉絲)，發現以此塑料(帝人 L-1225L)的Tg點(177℃)為基準，發現當澆口溫度低於塑料的Tg點時，產品澆口處發生拉絲的情況較少。
本論文以理論推導的方式，計算不同澆口位置的溫度，並利用實驗結果的數據，來修正以論推導所造成的誤差，而在修正後的誤差大約為37%，邊界條件修正後的誤差為±1%左右，最後再利用CAE分析來驗證此理論推導公式，CAE所分析與理論推導的誤差值約為±3%左右，因此證明由此方式可以簡單的計算出澆口的溫度，再去了解各塑料Tg點的溫度，可以建立出不同的熱澆道塑料澆口幾何的設計。

關鍵字

熱澆道 ； 熱嘴澆口溫度 ； 塑料Tg點

並列摘要

In the hot runner system can be divided into open and hot runner hot runner valve, which open hot runner cheaper and simpler. However, the most common problems open the gate hot runner is easy drawing, resulting in continuous production have an adverse situation and unable to continue production of the product occur, so the open gate hot runner temperature control is very important.
The main method now open hot runner drawing is to eliminate internal heat into the nozzle needle, so that the gate due to the influence of the inner needle drawing eliminate situations, because the impact of the inner needle will make the plastic shunt, which will lead to product They have combined to produce the line. When the product is a light guide plate is not allowed to have a combination of line production, the use of plastic for the characteristic temperature, the temperature at the gate control in the case of plastic rubber between states, it also will not easily brushed blocked gate.
In this study, 100mm hot mouth, based on research and analysis for hot runner nozzle temperature at three different gate location to install temperature-sensitive devices with different hot runner temperature, molding machine barrel temperature, mold temperature continues under production conditions, the gate for recording temperature changes, and observe the situation gates premises products produced (if there drawing), in order to find plastic (Teijin L-1225L) of Tg point (177 ℃) as a benchmark, It found that when the temperature is below Tg point gate plastic, brushed happens less product gate.
In this paper, theoretical analysis of the way, gate location calculated at different temperatures, and the use of results data to correct errors on to derive caused, and after correction of error of about 37%, the boundary condition error after correction about ± 1%, and finally the use of CAE analysis to verify the theoretical derivation formula, CAE analysis and the theoretical derivation of the error value is about ± 3%, thus demonstrating simple ways to thereby calculate the temperature of the gate, and then to get to know each plastic Tg point temperature, you can create a different gate hot runner plastic geometric design.

並列關鍵字

Hot runner ； nozzle temperature of the gate ； Plastic Tg point

參考文獻

45.徐正立，利用不連續加熱之方法進行熱嘴溫度控制之研究，中原大學機械工程學系研究所博士論文(2013)

43.林承洋，“熱流板內加熱器溫度最佳化研究”，中原大學機械工程學系研究所碩士論文 (2009)。

33.Jong Wen-Ren, Chang Yu-Cheng, Adrianta Arne, Lin Cheng-Hao, “ Optimal design for a hot runner nozzle cooling system”, 2011Annual Technical Conference – ANTEC, 2, 1686-1691 (2011).

7.J. Blundy, D. Reitan, and J. Steele, “Advanced Valve Gate Technology for Use in Specialty Injection Molding”, 1998 Annual Technical Conference-ANTEC, 44, 631-635 (1998).

11.Carolina L. Morelli, José Alexandrino de Sousa, António S. Pouzada, “Assessment of weld line performance of PP/talc moldings produced in hot runner injection molds”, JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, 13, 3, 159-165 (2007).