Wire-wound rod

Oligomer and Film Characterization. Brookfield viscosity measurements were taken on a Model RVTD digital readout viscometer. Samples for Instron testing were prepared on glass plates using 25 or 75 pm (1.0 or 3.0 mil) Byrd film applicator. Coatings for cure speed and MEK double rub (MEKDR) studies were prepared on aluminum Q-Panels using a 40 wire wound rod (100 pm or 4.0 mil). 

Flow was also studied qualitatively in pairs by simultaneously drawing them down on polypropylene film with a 50 wire wound rod. The leveling was visually evaluated. The 2-NP systems were both superior to the 100% alcohol system. 

Excessive coatings may be wiped from the glass cloth by applicators. They include, in the order of decreasing effectiveness, sharp-edged knives (doctor blade), round-edged knives, wire-wound rods, and fixed gap horizontal metering rolls. Coating thick-... 

Radiation Curing. Samples to be Irradiated were coated onto either Bonderite-40 treated steel test panels (Parker Chemical) or polyethylene coated paper board. An excess of the sample was placed at one end of the substrate and a 6 wire wound rod was drawn across the substrate with even pressure pushing excess material off the edge. This method produced coatings with a thickness of 6 to 12 um. 

Applicator a-pl3- ka-t9r (1659) n. Device to deposit a film of a specified thickness, such as doctor blade, wire wound rod, drawdown bar, etc. 

Wire-wound rod A metal rod wound with a fine wire around its axis to that an ink or coating can be drawn down evenly and at a given thickness across a substrate. The thickness or gauge of the wire controls the depth of wet fihn applied by the rod. Syn equalizer rod, meyer bar, wire-bar applicator. 

Canvas-canvas T-peel bonds. 2"/min. peel rate. A = adhesive failure at canvas C = cohesive failure A/C = mixed failure. Two coats of adhesive applied to each piece of canvas with 52 wire wound rod. 1/2 hour between coats. Green strength tested within 1 minute of joint assembly under indicated pressure. 

Drying Lines. Oven drying lines represent large capital investments, of the order of several million dollars, and the same line is frequently used to handle both solutions and latices. The metering equipment may be either reverse roll coaters, which offer maximum flexibility, or knife-over-roll coaters, which are less expensive. For thin films a wire-wound rod to remove excess material can be used. Because of coating difficulties encountered with latex vehicles such devices as an air knife or flexible blade are sometimes used with these products. 

---