Preheater roll

Preheater Roll As an example in a coating line a heated roll is installed between a pressure roll and unwind roll. Purpose is to heat the substrate prior to being coated. 

The web passes through an inlet nip, over the preheat rolls and enters the stretch section (Fig. 5). A high speed nip pulls the film in the machine direction. The amoimt of orientation in the film will be determined by the strain rate, stretch temperature, amoimt of stretch, and how quickly the film is cooled. Stretching between two rolls is a very high strain rate process in industrial settings, often of the order of 5000%/s. The level of orientation attainable is quite high. 

Preheat Roll n In extrusion coating, a heated roll installed between the pressure roll and unwind roll, the purpose of which is to heat the substrate before it is coated, thereby providing better adhesion of the... 

Vor-walzwerk, n. Metal.) roughing rolls, -wand, m. pretext, pretense, -warmapparat, m. preheating apparatus, fore warming apparatus. 

Elastomer-plastic blends without vulcanization were prepared either in a two roll mill or Banbury mixer. Depending on the nature of plastic and rubber the mixing temperature was changed. Usually the plastic was fed into the two roll mill or an internal mixer after preheating the mixer to a temperature above the melting temperature of the plastic phase. The plastic phase was then added and the required melt viscosity was attained by applying a mechanical shear. The rubber phase was then added and the mixture was then melt mixed for an additional 1 to 3 min when other rubber additives, such as filler, activator, and lubricants or softeners, were added. Mixing was then carried out with controlled shear rate... 

Drying of Solventless Double-Base Propellants. Since the manuf of solventless double-base proplnts is potentially hazardous, particularly rolling, drying, extruding machine operations, all such opns are performed by remote control. Following the final mixing, wringing screen opns, the water-wet paste is preheated to 90°F and fed by remote control into differential rollers in sufficient quantity to make two sheets. Hot water or steam is used to control... 

Preparation of Specimens for Mechanical Measurements. The specimens for mechanical testing were obtained by blending the powdered polymer with 1.5 phr of Ba-Cd stabilizer, 5 phr of CaC03, and 0.5 phr or lubricant (stearic acid). The dry blend was processed in a roll mill at 200°C for 5 minutes. The 1-mm sheets obtained were preheated in an oven at 200°C for 5 minutes and molded in a molding press at a pressure of 80-100 kg/cm2. The specimens were obtained by milling with suitable equipment. 

When you are ready to roll out the dough, preheat the oven to 375° ... 

Preheat the oven to 350 F and roll the chilled dough out to a 1/4-inch thickness. 

During fuser-roll resist lamination processes, the copper-clad FR- substrate surface temperature was found to be inversely proportional to the substrate thickness. This temperature fluctuation has resulted in changes of adhesive forces in the copper/resist interface which in turn can affect the yield in the printed circuit manufacturing processes. By using infrared preheat... 

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