By Glass J.E., Swift G.
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Extra info for Agricultural and Synthetic Polymers.. Biodegradability and Utilization
Tudgey, Advanced Composites Letters, 1993, 2, 6, 215. 60. D. Patterson, Materials Research and Standards, 1964, 4, 4, 159. 61. BS EN ISO 2818, Plastics – Preparation of Test Specimens by Machining, 1997. 62. ISO 4661-1, Rubber, Vulcanised or Thermoplastic – Preparation of Samples and Test Pieces, 1993. 63. L. Ennor, Journal of the Institute of the Rubber Industry, 1968, 2, 2, 98. 64. Y. Puw and H. Hocheng, Materials and Manufacturing Processes, 1993, 8, 6, 717. 65. H. Y. C. Yao, Materials and Manufacturing Processes, 1993, 8, 6, 653.
R. Travis, Polymer Testing, 1995, 14, 1, 97. 46. ASTM D5224, Standard Practice for Compression Molding Test Specimens of Thermosetting Molding Compounds, 2000. 47. ASTM D1896, Standard Practice for Transfer Molding Test Specimens of Thermosetting Compounds, 1999. 48. BS EN ISO 10724-1, Plastics – Injection Moulding of Test Specimens of Thermosetting Powder Moulding Materials (PMCS) – Part 1: General Principles and Moulding of Multipurpose Specimens, 2001. 49. BS EN ISO 10724-2, Plastics – Injection Moulding of Test Specimens of Thermosetting Powder Moulding Materials (PMCS) – Part 1: General Principles and Moulding of Multipurpose Test Specimens, 50.
In this work simple rectangular specimens were examined, many more complex shapes, such as dumbbells, could not be conveniently prepared other than with a die. For thicker sheets of flexible material dies or a rotary cutter are the only possibilities even for straight cuts. It is essential that dies are very sharp and free from nicks or unevenness in the cutting edge which would produce flaws in the test piece. Even with the sharpest cutter there is a tendency for the cut edges of the test piece to be concave and 4 mm is the absolute maximum thickness as the dishing effect becomes more severe as the thickness increases.