The Optipac VMC-15 by Mahlo GmbH + Co. KG is a modular process control platform purpose-built for textile finishing lines, with its primary value demonstrated on stenter frames — the energy-intensive drying and heat-setting machines that account for a significant share of a textile mill's total energy consumption. Rather than relying on conservative fixed-speed operation (where the operator sets a line speed slow enough to guarantee adequate drying for the heaviest fabric in the production mix), the VMC-15 closes the control loop on multiple process variables simultaneously, each through a dedicated sensor module that communicates on a shared digital bus and independently regulates its associated actuator.

How does automatic dwell-time control eliminate the safety-margin penalty?

In traditional stenter operation, the operator sets line speed based on experience with the heaviest or wettest fabric expected in the production run, adding a safety margin to ensure fixing temperature is reached. This guarantees quality — but guarantees inefficiency on every lighter or drier meter of fabric processed. The Permaset VMT module mounts non-contact infrared pyrometers at multiple positions inside the dryer, measuring actual fabric surface temperature as it traverses the heating zones. The VMC-15 calculates the moment the fabric reaches its target fixing temperature (dwell time) and continuously adjusts line speed to maintain exactly that dwell duration — not the conservative estimate. The result: lighter fabrics run faster, energy is not wasted over-drying, and throughput increases without capital expenditure on additional dryer capacity.

What sensor modules extend the VMC-15 beyond basic dwell-time control?

The VMC-15's modular architecture allows textile mills to add measurement capabilities incrementally. The Textometer RMS measures residual moisture at the stenter exit via contact electrodes, feeding back to line speed or drying temperature to prevent over-drying (which wastes energy and can damage fiber hand feel). The Gravimat FMI measures fabric grammage (basis weight in g/m²) across the full working width, controlling over-feed or coating application to maintain consistent weight specifications. The Ecomat AML analyzes exhaust air humidity, oxygen content, and water vapor concentration — enabling the controller to modulate exhaust fan speed and air recirculation flaps to minimize heated air discharged to atmosphere. The Famacont PMC measures thread and course density via optical scanning, adjusting over-feed to maintain stitch geometry. Each module can be added independently, allowing mills to start with the measurement that delivers the fastest payback and expand over time.

How does the Optipac VMC-15 integrate with Mahlo's weft straightening systems?

For mills already operating Mahlo Orthopac weft straightening systems, the Optipac VMC-15 can be combined into a single compact device that merges weft straightening control with process optimization. This consolidation reduces cabinet space on the production floor and provides the operator with a unified touchscreen interface for both functions — bow/skew correction and drying/fixing optimization — with shared recipe management across both subsystems.