Forest workers and environmentalists have faced off outside the Hobart headquarters of timber processor Ta Ann Tasmania.

Ta Ann is trying to rebuild its image after what it calls a misinformation campaign by environmental groups.

Operations manager Paul Woolley says green groups have damaged the company's international reputation, by claiming Ta Ann processes old growth timber.

The claims cost the company a contract with a London Olympics flooring manufacturer in the UK.

Mr Woolley says the company only uses regrowth timber, but has been targeted by activists since the forest peace deal was signed last year.

About 50 forest industry workers, unionists and politicians gathered for the launch of a brochure publicising its sustainable processes.

There was a tense stand-off when about 20 activists from the Huon Valley Environment Centre arrived.

They carried banners, beat drums and chanted at the forest industry workers who were told by Ta Ann staff not to react.

The centre's Jenny Webber maintains Ta Ann's wood requirements are stopping the full protection of high-conservation value forest.

The union representing forestry workers says it has run out of tolerance for the actions of forest protesters.

The CFMEU's Jane Calvert says activists have shown a disregard for workers' safety.

"The unions had about enough of that, we've reached the end of our tolerance on that."

"We say to those groups that want to continue that, show some respect for workers, show some respect for worker's health and safety or you'll have to this union to account for."