A. Causes:

① The molding temperature is not enough.

② Insufficient molding time

③ The vulcanization curve of the rubber compound is too long and fails

B. Countermeasures:

① Do a good job in process inspection and conduct personnel operation training to prevent the operation time from being too long and the mold temperature falling.

② Do a good check of the process to prevent insufficient curing time

③ Test the rubber compound to prevent the unvulcanized rubber compound from being too long to operate