Sig Corpoplast of Hamburg, Germany, claims its Premax 96 injection molding press has a 96-cavity mold that uses the same amount of space as a 72-cavity mold.
Sig said a compact design means the machine can use a smaller clamping unit with less mass, and a reduced clamping force, of 562 tons. The clamping unit design reduces cycle time by about half a second.
Other benefits of the new tool design include better preform quality, increased cooling efficiency and better melting quality. Cooling was improved by the cooling-channel geometry, the use of new materials and a new coating technology.
On the melting end, Sig developed a screw that gently plasticizes the PET at a reduced speed, so the resin is exposed to fewer sheer forces and runs at a reduced temperature. That means the bottles have less acetaldehyde contents, a desirable feature for water bottles.
The company's U.S. operation, Sig Plastics Technologies USA Inc., is in North Branch, N.J.
Tel. (908) 252-9350, fax (908) 252-9807.