The Hot Rolls Department at Kidwelly Tinworks

In the industrial heart of Carmarthenshire, the tinplate works at Kidwelly Tinworks once stood as a powerful symbol of South Wales’ contribution to the global metal trade. Among its most vital sections was the hot rolls department, where the transformation of raw iron into workable sheets first began.

At the core of tinplate production, the hot rolls department was responsible for shaping heated iron bars into thin sheets known as black plate. These bars, often referred to as “tin bars,” were first placed into intense furnaces until they glowed red-hot. Timing was crucial: the metal had to be removed at precisely the right temperature to ensure it could be worked effectively without cracking or losing quality.

Once heated, the bars were fed through a series of powerful rollers. These “hot rolls” were large, steam-driven machines that applied immense pressure, compressing and stretching the metal with each pass. The process was rarely completed in a single run. Instead, the metal was repeatedly passed through the rollers, sometimes folded and re-rolled, gradually becoming thinner and longer. This demanding sequence required both strength and precision from the workers who operated the machinery.

The environment inside the hot rolls department was intense. Driven by steam engines and heavy flywheels, the machinery produced a constant roar, while the furnaces generated overwhelming heat. Workers, known as rollermen, laboured in these harsh conditions, handling glowing metal with practiced skill. Their role was not only physically demanding but also highly technical, as the quality of the finished sheets depended heavily on their judgement and timing.

The importance of the hot rolls department cannot be overstated. It marked the first crucial stage in determining the thickness, uniformity, and overall quality of the tinplate. Any imperfections at this stage would carry through the rest of the production process, affecting the final product. After leaving the hot rolls, the sheets would move on to further stages, including cleaning, cold rolling, and eventually tin coating.

In essence, the hot rolls department served as the foundation of the entire operation at Kidwelly Tinworks. It was here that solid iron was first reshaped into a form suitable for refinement, setting the stage for the tinplate industry that once made South Wales a world leader.

This image is an AI-generated artist's impression of Kidwelly Tinworks Hot Rolls created by Mr Garry Smith.