塑膠帶材料的拉伸測試
塑膠帶廣泛用於包裝業，用以捆捲物品、將物品固定在託盤上，以便運輸。塑膠帶通常用聚丙烯或聚酯製成。聚酯比聚丙烯堅固，是鋼帶非常具有吸引力的替代品，因其不會被腐蝕（生銹）和染色，而且比鋼帶更輕、更安全、更容易處理，同時具有較高的拉伸強度。聚酯帶還能耐紫外線劣化，能夠在儲存和運輸過程中長時間暴露在紫外線下。
受到塑膠帶材料生產商的要求，要求為其拉伸測試提供解決方案，我們面臨很多挑戰。夾持解決方案必須能夠提供持續的夾力，因此排除了採用手動（用手夾緊）的方法。
25 mm寬的聚酯帶的預期斷裂力通常大於12 kN。由於此力大於大多數標準的氣動（空氣驅動）側面作動夾具所能承載的力，因此業界通常使用液壓（油壓）夾具。但我們的客戶傾向於使用氣動解決方案，因為液壓側面作動夾具成本較高。
初步測試顯示，標準帶鋸齒夾面無法使用，因為夾面會造成聚酯帶縱向裂開，過早破壞。我們在5900系列機架（也能使用3300系列）上成功進行了測試，採用了客製化的30 kN氣動側面作動夾具和專為塑膠帶設計的夾面。如圖表所示，所得到結果很一致，而且10件試樣中有9件獲得良好的斷裂（請見附圖）。試樣3發生了縱向破壞，但是不影響其實驗結果。請注意，為獲得良好的清晰度，圖表中的曲線經過了偏移。
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