Fiber rolling

Wollastonite. Wollastonite is a fibrous calcium silicate sometimes used in industry as a substitute for asbestos. Further testing will be necessary if wollastonite is present. See the discussion on fiber rolling, and the table on identification of fibers by dispersion stain. 

Step III. If the identity of the fibers remains doubtful after phase contrast and polarized light study on the membrane, remove fibers from the membrane and examine by dispersion staining. All of the optical tests described herein can be performed while the fibers are on the membrane except fiber rolling, dispersion staining, and determination of n. 

Fibers are rolled around their long axis by gently tapping the cover slip with a dissection needle. Keep the fiber in view at all times as this is done. If a mineral plate is seen on edge it may resemble a fiber. Rolling the plate over reveals the true nature of the plate. This is a useful test when platy minerals such as talc or mica are being examined for the possible presence of asbestos. 

Outdoors, material should be stored under cover if protection is needed from wind, rain or flooding, heat, and ignition from the sim or nearby sparks and fires, or vandalism and theft. Special precautions are necessary with some commodities. These include carbonaceous materials (coal, coke, charcoal), cellulose and fibers (roll paper, pulpwood, wood chips, wastepaper, baled fibers), and rubber (tires, bales). Refer to the NFPA guides for these types of materials. 

Kataoka, T. Pol5mrethane elastic fiber roll containing hydrophobic dyes for disposable diapers. Jpn. Kokai Tokkyo Koho JP 2005154909, 2005 Chem. Abstr. 2005, 143, 65549. 

The cleaning process proceeds by one of three primary mechanisms solubilization, emulsification, and roll-up [229]. In solubilization the oily phase partitions into surfactant micelles that desorb from the solid surface and diffuse into the bulk. As mentioned above, there is a body of theoretical work on solubilization [146, 147] and numerous experimental studies by a variety of spectroscopic techniques [143-145,230]. Emulsification involves the formation and removal of an emulsion at the oil-water interface the removal step may involve hydrodynamic as well as surface chemical forces. Emulsion formation is covered in Chapter XIV. In roll-up the surfactant reduces the contact angle of the liquid soil or the surface free energy of a solid particle aiding its detachment and subsequent removal by hydrodynamic forces. Adam and Stevenson s beautiful photographs illustrate roll-up of lanoline on wood fibers [231]. In order to achieve roll-up, one requires the surface free energies for soil detachment illustrated in Fig. XIII-14 to obey... 

Fibre Box Handbook, Fiber Box Association, Rolling Meadows, HI., 1992. 

In the spray-up process a reinforcement, usuaHy glass fiber, is substituted for the mat and a special spray gun simultaneously chops the glass fiber and appHes it with catalyzed resin to the mold surface. Hand rolling techniques then consoHdate the fiber and resin to conform to the mold surface contours. The shorter chopped fibers aHow for more intricate design detaHs than do mats. Both processes rely heavily on the operators skiHs for product quahty. These two processes require the least capital investment and have the largest product size capabHity of aH the processes. A single-surface mold produces a part with one controHed (usuaHy the visible) surface. 

Preforming method or feed slots Rolling extruder slots Filtered and perforated plate Fiber feed screen Pressed screen Extrusion Rolling extruder... 

Otner Collectors Tarry particulates and other difficult-to-handle hquids have been collected on a dry, expendable phenol formaldehyde-bonded glass-fiber mat (Goldfield, J. Air Pollut. Control A.SSOC., 20, 466 (1970)] in roll form which is advanced intermittently into a filter frame. Superficial gas velocities are 2.5 to 3.5 m/s (8.2 to 11.5 ft/s), and pressure drop is typically 41 to 46 cm (16 to 18 in) of water. CoUection efficiencies of 99 percent have been obtained on submicrometer particles. Brady [Chem. Eng. Prog., 73(8), 45 (1977)] has discussed a cleanable modification of this approach in which the gas is passed through a reticulated foam filter that is slowly rotated and solvent-cleaned. 

Specifications include dimensions of length, width, and depth, in that order (Fig. 21-40 ). When boxes are set up and closed by automatic equipment, dimensional tolerances become critical. Cartons are shipped knocked down to the user from plants located in all industrial centers. Because order lead time is 4 to 6 weeks, inventories of empty boxes require considerable space. A useful booklet describing all aspects or corrugated box designs and materials is the Fiber Box Handbook available from The Fiber Box Association, 2850 Gulf Road, Rolling Meadows, IL 60008. 

Bundle of continuous, untwisted glass fibers. Glass fibers are wound onto a roll called a roving package. ... 

Automatic roll A motor-driven continuous roll of material, either viscous or fiber, which ensures a set pressure drop in the airflow. Its operation depends on sensors that record the pressure differential on either side of the filter. 

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