Günther Hot runners to the fore in production of writing instruments
Germany – For 70 years, Wernigerode-based company Schneider has been producing high-quality writing instruments. The company’s continued success today, which includes the production of 80 million ink cartridge cases each year, involves systems from Günther Hot-Runner Technology.
Schneider can look back on a 70-year history to its founding as Heiko Schreib- und Zeichengeräte in 1946. Following German unification the company was taken over by the firm of Schneider Schreibgeräte in Tennenbronn in 1991 and founded a new company with 56 employees under the name of Schneider GmbH Co. Productions- and Vertriebs KG.
Today Schneider has a staff of 135 employees and a production floor space of 8,700 m², producing writing products that are sent all over the world. Its injection moulding department comprises 28 injection moulding machines and there are other departments for assembly, printing and design as well as a tool shop. The company places a high degree of value on providing its own training for its future employees. As a rule, all apprentices are given employment in the company at the end of their apprenticeship.
Hot runner systems were first used in the injection moulds in the year 1994 with the goal of increasing production capacity. The first hot-runner system for indirect injection in a 72-cavity production mould for ink cartridge cases made it possible to triple production capacity. Today over 80 million ink cartridge cases are produced each year, the cartridge cases also filled, sealed with glass balls and then packed at Schneider.
Working with the firm of Günther Hot Runner Technology from Frankenberg (Eder) in North Hesse, Germany, Schneider was able to reduce material consumption by eliminating thick-walled gating systems which also significantly reduced the cycle time because of the shorter cooling time.
In a next step the moulds were equipped with an even greater number of cavities and with more hot-runner technology. Open hot runner nozzles with a two-part shaft and naturally balanced manifolds are used. The gating is done with a subrunner, which ensures the cores’ position stability. The two-part nozzle shaft made of titanium alloy and tool steel allows, in a confined installation space in combination with the integrated air gap in the hot runner nozzle, a very good thermal separation between the hot runner and the temperature-controlled mould.
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