Rotary Unit Is Lower-Cost Option For Small Bottles

A new rotary wheel extrusion blow molder boasts a unique design that eliminates hot flash and reduces the manufacturing cost of small single-serve containers of 100 to 500 cc.

A new rotary wheel extrusion blow molder boasts a unique design that eliminates hot flash and reduces the manufacturing cost of small single-serve containers of 100 to 500 cc. The SB series from Wilmington Machinery, Wilmington, N.C., is said to cut material, energy, and labor costs and permit use of less expensive and simplified bottle trimming. The SB reportedly can reduce hot flash (typically tails and domes) by up to 33% compared with other machines. The system blows in between the molds, thus eliminating all compressed tail flash, according to v.p. Jeff Newman. The bottles are randomly dropped onto a cooling conveyor and then transported to a high-speed unscrambler. Bottles are oriented and placed on a vacuum conveyor and moved to a high-speed spin trimmer. The SB is said to be cost-competitive with reciprocating-screw technology and has the added benefits of multilayer capability and higher productivity. It comes in a range of sizes (18 to 60 cavities) with up to seven-layer coextrusion. A typical 30-cavity machine running a 7-sec cycle produces 260 bottles/min or 15,000 bottles/hr. Targeted applications include liquid yogurt, dairy products, hot-fill drinks, juices, and retort packages.