TCS (Thickness Compensation System) is the new dynamic device – entirely developed and patented by Uniloy Milacron – to modify the parison thickness in specific angular positions during the accumulator head extrusion process. A typical problem of uneven wall thickness of the containers is originated by the different stretching ratio of the parison in the top and bottom areas of the cavity, that can not be compensated by the standard “axial” parison thickness control. Besides the waste of resin, the extra thickness in localized positions results in a longer cycle time, because of the longer cooling time needed, just to prevent the warping originated by these small areas. Instead of expensive and single-sized flexible die-rings, the TCS by Uniloy Milacron works on a different concept to modify dynamically the gap between core and die during the parison push-out.

Net weight reductions up to 10% have been achieved maintaining the mechanical performances of the original container, as well as cycle time reductions greater than 18% without compromising container quality.

TCS units are in operation at customers’ sites producing jerrycans and L-ring drums. Customers are enthusiastic about the versatility and the reliability of the system: different tooling sizes can be easily swapped on the same TCS unit (no need to replace the full system), and no heat-sensitive components (electronic or hydraulic) are located in high-temperature zones.

The TCS device is also available to retrofit to existing heads, improving production performance and reducing the cost of the parts produced: an extraordinary opportunity for our customers to stay competitive with a limited capital investment.