ITW MR1300 DYNAFIBER UFD Applicator Heads

ITW Dynatec’s MR1300 DYNAFIBER UFD Applicator Heads are air-operated single or multi-module hot melt adhesive applicator assemblies with integrated basket filters which prevent particulate matter from obstructing flow through the heads.

Replaceable cartridge heating elements controlled by an integrated sensor and electronic control unit heat the applicator. Each model can be configured for ITW Dynatec’s DynaControl, MCV or Upgrade control schemes or for Allen-Bradley and Siemens PLC controls. Pressure transducer ports are standard features for all applicators. A choice of adhesive inlets and an angled filter nut allow either vertical or horizontal spray.

Four standard Dynafiber UFD models supporting up to six modules are available, ranging in width from 50mm to 150mm (2” to 6”). Assembly of multiple models allows for increased web coating widths.

Theory of Operation

Each UFD applicator features one or more MR1300 adhesive valve module mounted to a single service block. Each module is opened and closed by air pressure. Springs are used to keep the stem closed when no air pressure is supplied to the head. The adhesive pressure applied by the adhesive supply unit’s pump, the nozzle type and the stem stroke adjustment determines the rate of adhesive flow from the applicator.

The heated adhesive supply hose may be connected at the rear of the applicator or at the top. Adhesive flows from the hose into the service block through the filter and then to the module. Air pressure (Control Air) opens the adhesive valve allowing adhesive to flow through the module’s nozzle. Adapters are available to allow industry-standard pressure transducers (1/2-20 thread) to be connected to monitor adhesive pressure within the service block. On the UFD models, an air pre-heater is located below the service block. The pre-heater supplies heated air (Process Air), to fiberize the adhesive streams, to the UFD modules. The air pre-heater is thermally isolated from the service block.

Note: MR1300 Bead Applicators utilize the same power as listed above, without the air pre-heater.