The company now had no choice but to change if it was to survive. The printing department was closed down and the production of hand-made bags ended. The market for polythene bags was increasing hand in hand with the rise of the supermarket chains; to take advantage of this the company bought its first machine for making polythene bags in 1975.

Two years later, a four colour flexographic printing press was acquired and the firm began to expand both its polythene converting department and its flexographic printing department. A little later a more sophisticated eight colour press was installed in a new building at Bank Mills.

By the end of the 1970's the company was making millions of paper, polythene and carrier bags every week. One of the firms major purchases was polythene. A polythene extrusion business near Huddersfield went into receivership and Roberts Mart was able to purchase the firms assets. Roberts Mart set up the new business, which became Romar Packaging in June 1983. Romar now supplies some forty percent of its production to Roberts Mart, selling the remainder externally.

In the 1980’s Roberts Mart patented the “Roll Pack” a duvet packaging system which was extended subsequently to pillows and sleeping bags.

At the end of 2000, after 60 years of dedication to Roberts Mart, Peter Roberts was succeeded as chairman by his son John Roberts.