B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/151
B29D 30/52 (2006.01) B29C 33/50 (2006.01) B29C 39/02 (2006.01) B29C 53/56 (2006.01) B29D 30/06 (2006.01)
Patent
CA 1165520
PROCESS FOR MOLDING REINFORCED ARTICLES ABSTRACT OF THE DISCLOSURE A reinforcing cord 11 is positioned in a mold cavity 19 for reinforcing an annular article such as a tire 59 by wrapping the cord 11 on an annular spacer band 10 which is supported on a mold core 18 and then placed in the mold 43. The mold 43 is charged with a liquid polyurethane reaction mixture to form an outer polymeric ring 53 of the annular article which is- adhered to the cord 11 and partially cured. The spacer band 10 is removed, the mold 43 closed and charged with additional liquid polyurethane reaction mixture to form an inner polymeric ring 54 of the annular article adjacent the reinforcing cord 11 carried by the outer ring 53. The partially cured outer ring 53 and the inner ring 54 are then cured to adhere the inner ring 54 to the outer ring 53 with the layer of reinforcing cord 11 encapsulated between the rings. An additional layer of reinforcing cord 72 may be positioned in the article by wrapping another cord 73 around a second spacer band 77 having a smaller diameter than the first spacer band 10. The second spacer band 77 is placed in a mold 74 and defines a cavity 79 between the spacer band and 10 the outer ring 53", The mold 74 is then charged with additional liquid reaction mixture to form the second polymeric ring 82 and encapsulate the cord 73 on the second spacer ring 77 and partially cure the second ring 82 for adherence to the first ring 53". The second spacer band 77 is then removed and the mold 74 charged with additional liquid reaction mixture to form the radially innermost third polymeric ring 86. The reaction mixtures of the second and third rings 82 and 86 are then cured to provide adherence between the adjacent rings.
376645
Knizley James B.
Payne Roger E.
Rossi Robert K.
Smart & Biggar
The Goodyear Tire & Rubber Company
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