Munich, Germany-based Krauss-Maffei Kunststofftechnik GmbH said the patented PowerPulse Dynamic temperature control system used in the Futuremold III mold series produces optical discs with outstanding accuracy and minimal dishing and tilt values, all in a short cycle time.
The system can be converted onto existing disc production lines from Krauss-Maffei, making them suitable for molding high-definition DVDs. The larger process window also makes it easier to make Blu-ray discs, the company said.
With DTC, each mold half is equipped with a cooling section close to the cavity and another one far away form the cavity. During the heating process, the one near the cavity supplies the cooling section far from the cavity.
All four heat-balancing circuits are controlled in the mold, with a heat-balancing unit circuit and a pump. The advantage, according to Krauss-Maffei: The entire mold operates at a single temperature.
To cool the mold, only the circuits near the cavity are briefly switched to the colder cooling circuit. Cooling channels farther away keep the high temperature level constant in the mirror area of the mold and are used to store heat for a fast temperature change.
During part removal, the cooling circuit sections near the cavity are switched to heating.
The system keeps a high surface temperature for injection and a low surface temperature for demolding.
The company's U.S. headquarters, Krauss-Maffei Corp., is in Florence, Ky.
Tel. 859-283-0200, fax 859-283-9631, e-mail [email protected]