... 36, 101 (1968) 13. RAINB, H. c., Trans. Plastics inst., 28, 153 (1960) 14. PRITCHARD, J. E., MCGLAMERY, R. M. and BOEKE, P. J., Mod. Plastics, 37, (2) 132 (1959) 15. HAYES, ... F. and SELLDORF, I. I., Mod. Packaging, 33, 133 (1961) A,), Maclaren, London (19 67) 10. D. J. GRAY, Plast. Rubb. Process., 60 (1 977 ) 11. CLARK, K. J. and PALMER, R. P., S.C.I. ... RANALLI, F., Trans. Plastics Inst., 27, 55 (1959) 2. VAN DER WEGT, A. K., Trans. Plaslics Inst., 32, 165 (1964) 3. CHARLEY, R. v., Brit. Plastics, 34, 476 (1961) 4. Technical...