Sheet: On-Line Tool Calculates ROI for Fast-Change Die
Processors can analyze how quickly new fast-change die pays for itself.
Nordson Corp., Chippewa Falls, Wis., has developed a digital tool for comparing the cost inputs of standard sheet dies with removable lower lips and those of the EDI SmartGap mechanism for rapidly changing sheet thickness. The tool, called the SmartGap Payback Analysis, enables sheet processors to calculate the payback time for switching to SmartGap technology.
SmartGap technology enables processors to make changes in thickness with unprecedented speed, extend the range of thicknesses that they can produce, and achieve these improvements while enhancing sheet quality. The system uses a single-point adjustment mechanism that changes the lip gap while simultaneously modifying the length of the lip land to provide the most appropriate conditions for the newly adjusted thickness as the sheet exits the die. By mechanically linking the adjustment of these two key process variables, the SmartGap system ensures a proper set-up of the die and takes substantial time and guesswork out of the process for achieving desired sheet properties.
Users of the SmartGap Payback Analysis enter two types of information: 1) the one-time costs of equipment investment for a standard sheet die with removable lower lip and for a new SmartGap system; and 2) process data including die length, output rate, number of die gap and die lip changes, number of working days, raw material cost, approximate product selling price, and burden cost of sheet line per hour.
Using these inputs, the tool calculates the daily output values of the two systems, including downtime, missed production output, downtime cost, missed product gross profit, and total downtime cost; compares the time required for changing die lips versus that needed for changing the die gap in the SmartGap system; and estimates the how long it would take for a complete return on an investment in the SmartGap system.
Payback typically occurs in a matter of months, according to Nordson.
All things being equal, PET will outperform PBT mechanically and thermally. But the processor must dry the material properly and must understand the importance of mold temperature in achieving a degree of crystallinity that allows the natural advantages of the polymer to be realized.
A lot of things must be in place to achieve what I like to call efficient extrusion.
A poorly designed profile die—one that does not permit the part to be extruded with the same dimensions from run to run—coupled with a lack of understanding of the extrusion process, is a recipe for scrap generation.