Greyhound Recycling will ask the High Court to enforce orders preventing strikers and their supporters from engaging in illegal activity when picketing its Clondalkin plant in a dispute over pay.
The company has warned that 400 jobs at the company are now in jeopardy because of what it describes as a blockade of trucks at the Dublin plant.
Greyhound owner Michael Buckley yesterday said he was disappointed that workers had rejected what he called the best offer the company could make.
The workers rejected by a significant majority the new pay proposals, which were aimed at ending the three-month dispute.
Mr Buckley confirmed Greyhound would now be going to the High Court to seek enforcement of injunctions that were previously granted to the company to prevent illegal activity by some on the picket line.
He said it would also be seeking damages from anyone involved in any illegality that had affected the company.
However, the workers have described the latest company offer, which still involves pay cuts of around 30%, as derisory.
Some said they were prepared to go to jail if necessary to defend their pay and conditions.
SIPTU, which has so far paid out strike money totalling almost €250,000, stresses that it has not engaged in illegal activity.
Supporters of the strikers are expected to protest at the court.
However, representatives of the other 320 employees at the company may hold a counter-protest backing management in an attempt to protect their jobs.