There are fears that hundreds of jobs are on the line as union bosses go into urgent meetings with several big businesses battling to survive.
First Union boss Robert Reid says the jobs situation will continue to worsen and he has been in talks with at least two large companies on the brink of receivership.
Mr Reid would not say what the businesses were but between them they employed about 400 people whose jobs were in jeopardy.
It comes as hundreds of job cuts have been revealed by big employers in recent weeks and an Opposition inquiry investigates what can be done to deal with New Zealand's "jobs crisis".
"In both those cases it is processing companies of New Zealand raw materials and it is the dollar that is the absolute killer," Mr Reid said.