Opitz GmbH, Aschaffenburg, Germany, has developed a date stamp (type: Dati 2900) for injection molds, which is mechanically locked and functions without additional parts such as pressure pieces or O-rings. The mechanical locking system is incorporated directly in the adjustable insert and sleeve of the date stamp. If the injection pressure in the process increases, the mechanical locking system adapts. The stamp is not therefore independently self-adjusting and is largely protected from contamination. The system was previously a special solution but successful practical experience has now led to the stamp being included in the standard catalog range.
According to the company, solutions using a spring pressure piece or O-rings are not optimum. Spring pressure pieces can be susceptible to contamination and high temperatures. In addition, they generally do not increase the torque of the central insert substantially. An O-ring becomes brittle with time and is not suitable for long-term use, especially with high-temperature molds. The stamp can be adjusted by feel/ear because each number position has an engagement point. This makes operation easier, particularly with large molds or date stamps that are difficult to see. The central insert of the stamp can also be changed from the front without dismantling the entire stamp. The insert is available immediately in the following diameters: 4, 5, 6, 8, 10, 12 and 16 mm.
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