Forming impression or pattern of running surface of type after use - by placing liq. photopolymerisable compsn. in negative mould, exposing to UV, sepg. positive moulding, and hardening by UV

摘要

Impression or pattern of running surface of a tyre after use is prepd. by (a) forming negative mould of running surface, (b) running liq. photopolymerisable compsn. (I) into the negative mould, (c) applying vacuum to (I), (d) exposing (I) to UV radiation for time sufficient to crosslink photopolymer and form positive moulding of running surface, (e) sepg. positive moulding and negative mould, (f) exposing positive moulding to additional UV radiation in absence of O2 for time sufficient to harden surface of moulding. USE/ADVANTAGE - Forming 3-dimensional reproduction of running surfaces to check for wear pattern associated with noisy running or loss of grip. Good quality reproductions are obtd. more quickly (in under 1 hr.) than if plaster negative mould and plaster or elastomer positive mouldings are taken.