Delta Tecnic has simplified the colouring of TPU cables with its customised solution for colouring special cables. The company has managed to simplify and optimise the process by using a single masterbatch per colour, despite using different compounds with different flame retardant levels and colours due to the use of various fire retardant loads.
TPU is the most widely used polymer in special cables and stands out for its resistance to rubbing and its ability to withstand continuous and mechanical movements. However, fire resistance is a critical factor in many applications, both in buildings and machinery. With the increase in fire safety related restrictions, the demand for more fire resistant TPU cables has been increasing.
To make TPU flame retardant, it is necessary to add fire retardant fillers, such as white coloured mineral fillers. The more charges added, the higher the fire resistance. Currently, there are different grades of fire resistance in TPU on the market, each with a different shade of white. This has created challenges for cable manufacturers, as each grade requires a specific colour masterbatch.
A significant reduction in required references
In this context, the company has been developing a single masterbatch capable of covering the same colour in the different ranges of TPU. Rather than having to use a specific colour masterbatch reference for each compound according to its fire resistance, with the solution offered by Delta Tecnic, a single colour masterbatch covers the different TPU compounds, simplifying the number of references and unifying the final colour of the cables manufactured, regardless of the degree of flame retardant required.
The key to this solution lies in the economy of scale and the optimisation of production. Although, the masterbatch used for white coloured TPU is more expensive due to the higher pigment load needed to obtain the correct colour, the increase in batch size and the consolidation of individual productions have enabled a single masterbatch to be obtained. This not only generates cost savings for manufacturers, but also a reduction in the material needed in inventory, freeing up work capital and standardising the colour of the cables manufactured by their customers.
TPU has become increasingly important in the cable industry, especially in electric vehicle charging, because of its flexibility, resistance and excellent properties for outdoor use. It is an optimal material for cables used for applications, such as charging stations and in electric vehicles. This demand has fuelled the need for efficient and customised solutions.