The Norwich-based company has installed a Hudson Sharp 5750W seven bag-making machine, its second Hudson Sharp install in 15 months.

The new machine has a capacity of 380 bags per minute, and converts polythene film from a reel into a self-seal envelope.

Polyprint managing director Jonathan Neville said that bagging work for food was being contracted out up until the install of its first machine last year.

He said: "The ability to do this in-house has helped us to be more flexible, achieve quicker turnaround times, and achieve better quality control. As we started to expand our food packaging printing business, we saw that there was going to be a need for much increased capacity, and we decided to invest now in a second, faster machine so that we can continue to offer the same level of service as demand increases."

Polyprint achieved BRC certification last month, enabling it to print primary food packaging.

Formed in 1988, Polyprint has a turnover of £7m and employs 57 staff. It has specialised in film bagging for magazines but is moving increasingly into food bagging.