Nowadays a high degree of automation in filament yarn laboratories as well as a short response time to irregularities in the production process are key factors of a state-of-the-art quality control system.

Textechno’s new COVAMAT meets all those requirements and matches the global standards for yarn evenness control measurements. The tester features a novel capacitive sensor design, a self-threading high-speed yarn twister and testing speeds up to 800 m/min in combination with an automatic package changer for 24 yarns.

As an alternative, the COVAFIL+ capacitive evenness tester without package change is still available either as a stand alone unit or in combination with Textechno’s well-proved filament yarn testers DYNAFIL ME+ and COMCOUNT.

Test methods:

• Measurement of mass variation with constant twist, speed, and pretension (standard test).
• Measurement of mass variation with variable twist, constant speed and constant pretension to conveniently establish the optimum level of twist.

System components:

• Automatic package changer with 24 positions.
• Adjustable yarn guides for optimum yarn positioning in capacitive sensor.
• Capacitive sensor with integrated electronics.
• Self-threading high-speed yarn twister.
• Casablanca type yarn feeding device.
• Integrated temperature- and humidity sensor to monitor the laboratory climate.