The mass variation is one of the most important quality parameters of filament yarn.

Textechno’s COVAFIL+ with its novel capacitive sensor design
and a self-threading high-speed yarn twister meets all requirements for an effective and reliable quality control system.
The COVAFIL+ can either be operated as a stand-alone unit or in combination with Textechno’s well-proved filament yarn testers DYNAFIL ME+ and COMCOUNT, which gives highest testing efficiency and flexibility. The latter setup of testing instruments gives you – apart from tensile strength and elongation – all relevant yarn parameters with just one test system.

Test methods performed with the COVAFIL+:

• 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.
• Measurement of linear density (in combination with COMCOUNT).
• Preparation of samples with known mass.

Textechno also offers a capacitive tester for measuring evenness and hairiness in spun yarns, rovings, and slivers.

System components:

• Yarn tensioner or optional positive yarn feeder.
• Adjustable yarn guides for optimum yarn positioning in capacitive sensor.
• Capacitive sensor with integrated electronics.
• Self-threading high-speed yarn twister.
• Yarn feed system by godet.
• Integrated temperature- and humidity sensors to monitor the laboratory climate.

Optional components and devices

• Positive yarn feeder for controlled yarn tension, tension range 1 to 100 cN.
• COMCOUNT automatic linear-density tester, yarn transport by laboratory air.
• Automatic sample collector with exchangeable magazines (20 positions).
• DYNAFIL ME+ universal filament yarn tester for combined draw-force, shrinkage, or crimp testing.

Automatic package changers:

• Automatic package changer model SM with two positions.
• Automatic package changer model ASW+ with 20 positions.
• Both models can splice on the running yarn for optimum reliability and throughput.

Desktop version:

The COVAFIL+ is also available in a desktop version.