本研究探討紙類產品於再次加工後產生的變化，透過旋轉切碎實驗找出紙張重新散漿後其纖維長度與強度之關係，分析不同紙漿製程參數對於紙漿複合材料 (Pulp composites)之材料配比對於壓合成形後拉伸衝擊試片機械性質強度的影響，以不同製程參數進行全因子壓合成形實驗，探討其機械性質。研究方法先以紙漿之旋轉切碎時間與旋轉切碎溫度進行實驗，找到溫度與時間對於纖維長度之影響，並做為下階段實驗參數；紙漿複合材料的製備方式先以旋轉切碎方式並加入玉米澱粉進行材料整備，搭配不同製程參數以進行三因子兩水準之實驗，實驗中以定量紙纖維方式進行試片之成形，探討旋轉切碎時間、玉米澱粉之配比與烘乾溫度對於機械性質之影響。以直立式射出成形機做為實驗機台並搭配壓合製程工序進行拉伸與衝擊試片的打樣，並以完成之試片進行不同的測試以分析其機械性質。由拉伸與衝擊實驗結果得知，紙纖維與玉米澱粉之配比旋轉切碎時間(TSmash) 15分鐘、添加材料重量 (PC. Starch) 50 %與乾燥溫度(TDry)65℃對於材料強度有其正相關，其拉伸強度為4.93MPa；衝擊與硬度試驗與拉伸試驗其參數差異為乾燥溫度(TDry) 40℃，其試驗最佳之衝擊強度0.48 J/cm2；最佳硬度為60.1 (Shore D) ，由實驗結果得知主要影響拉伸及衝擊強度為是否有添加玉米澱粉達45 %與61 %，而影響表面特性之因子為纖維長度，其影響達41 %。本研究成果可應用於紙類產品回收後，再應用於不同產品上的強度設計參考。

This study focuses on the effectiveness of mechanical properties by the laminate test pieces, made of pulp composite materials in different pulp process parameters, with the Full Factorial Design experiment (FFD) conduct to different process parameters. The influence of fiber length of pulp is found out by the experiment of smashing time and temperature of the pulp as examining parameters for the next step. The preparations of pulp composite materials are followed by the former parameters to do the experiments of three factors and two levels. The effectiveness of mechanical properties is influenced by the smashing time, the ratio of corn starch, and the drying method.The study has used a vertical injection molding machine as the experimental machine, making the adjustment of die-core spacing, and applied on the compression process. Due to the wet process of pulp, the mold has added a drainage system. In order to avoid traditional ejector pin demolding damage to the incomplete product, the mold has applied panel-board demolding. The results of the stretching and impact experiment revealed that there is a positive correlation between molding parameters and material strength. The best strength of stretching is 4.93 MPa and the parameters which crushing time of paper fiber and cornstarch (TSmash) is 15 minutes, material weight (PC. Starch) is 50 %, and drying temperature (TDry) is 65 °C. Another result with TDry is 40°C that impact strength is 11.156 µm and the surface hardness is 60.1 (Shore D). It was found that the main influence factor of mechanical strength is whether corn starch added and the main influence factor of surface characteristic is the fiber length of pulp. The influence ratio of corn starch are 45 % and 61 %. The influence ratio of fiber length is 41 %. Results of this thesis can be used as a design reference for the strength of different products after recycling paper.

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