Mechanical Property Evaluation of TPU Honeycomb Grid Buffering Composite Nonwovens
Thermoplastic polyurethane (TPU) honeycomb grid can be served as a buffering packaging material due to its special construction. Using its structure property, structure body produces dynamic stress and strain when suffering from stress. One part of energy is stored, and other part is converted into heat dissipated by structure conduction, thus TPU honeycomb grid is a kind of viscoelastic materials with high compression. Therefore, this study designs to fabricate the buffering composite nonwoven with three-dimensional (3-D) honeycomb sandwiched structure using 3-D crimped PET inflame-retarding fibers and TPU honeycomb grid through nonwoven processing technique. In the processing, areal weight of PET inflame-retarding nonwoven compounded with TPU honeycomb grid was changed. By measurements of tensile strength, strength efficiency, tensile elongation and tear strength, effects of processing parameters on mechanical property of composite nonwovens were discussed. Testing result shows that TPU honeycomb grid buffering composite nonwoven has better tensile strength even with change of areal weight for PET nonwoven. When PET nonwoven is 250 g/m2, tensile strength along CD and MD is 285.6 N and 284.2 N respectively.