Wet Blankets

One of the interesting ways fiber bonded materials are incorporated into furnaces is with the use of blankets of fibers wet with colloidal silica from the manufacturing process. The fibers, colloidal silica and additives are formed into the simple shape of a blanket of fibers. While still wet, the blankets are put in plastic bags to prevent water evaporation. These are shipped to the user and the wet blanket is removed from the plastic bag just prior to its being incorporated into the furnace wall. The water is then free to evaporate and the colloidal silica particles bond the structure together into the given shape. 

FIGURE 12.53 Colloidal silica flocculates fibers and starch by charge attraction. 

---

Haig postulated the condition of collaemia, "the presence of uric acid as a colloid in the blood stream and its action as an obstructor of the tiny capillaries." (17) By impeding the flow of blood, colloidal uric acid forced an increase in blood pressure throughout the body, and also, Haig reasoned, lowered the metabolic rate (or, to use his homely analogy, acted like "a wet blanket on a fire."). (18)... 

Isolate the packing from the hot work area using physical barriers or noncombustible wetted blankets. 

The statistical wet blanket. Whatever interesting feature has been noted in our sample (a change in an end-point or a relationship between two sets of data) is assumed not to be present in the general population. The apparent change or relationship is claimed to be due solely to random sampling error. 

Perreau (d. 1660), published A wet-blanket on triumphant antimony . Opposition to the use of chemistry in medicine was a great help to a Paris physician in getting on in Patin s time, but in 1637 antimony was admitted as a purgative by order of the medical faculty, confirmed in 1666 by a vote of 92 out of 102. Claude Germain, one of the faculty, was nearly poisoned by antimony and wrote a large book against it. An alchemical book was attributed to him. ... 

Slow burn-out tends to be associated with high-quality burn-out conditions and to produce a not unduly excessive wall-temperature rise. In fact, there appears to be an extreme condition in which the temperature rise may hardly be noticeable, and it becomes difficult to say whether burn-out has occurred. These circumstances probably coincide with the jump discontinuity in Fig. 3 ceasing to exist for certain values of system parameters. The condition is effectively one in which, at the burn-out point, the heat-transfer coefficient is the same whether the surface is vapor-blanketed or liquid-wetted. 

Certain wetting agents and some dry chemical powders may be incompatible with some foams. If they are used simultaneously, an instantaneous breakdown of the foam blanket may occur. Precautions must be taken to ensure that such agents are fully compatible with the foams being used. 

Blanket crepes are of lower quality and are made from wet slabs obtained usually from small landholders. These are creped. dried, and baled. Other types of crepe are made from coagulum left in collection cups and from dried skin remaining from the tapping incision. In addition to collecting latex, a tapper collects all dried and coagulated rubber that remains from die previous round, usually as skin m the cup or on the tapping panel. 

Consider a vertical flat plate exposed to a condensable vapor. If the temperature of the plate is below the saturation temperature of the vapor, condensate will form on the surface and under the action of gravity will flow down the plate. If the liquid wets the surface, a smooth film is formed, and the process is called film condensation. If the liquid does not wet the surface, droplets are formed which fall down the surface in some random fashion. This process is called dropwise condensation. In the film-condensation process the surface is blanketed by the film, which grows in thickness as it moves down the plate. A temperature gradient exists in the film, and the film represents a thermal resistance to heat transfer. In dropwise condensation a large portion of the area... 

The largest use is for binding fibrous and granulated wood into indoor composition board. Smaller uses are for wet-strength paper and permanent-crease textiles. About 4 percent of urea-formaldehyde resin is combined with alpha-cellulose to make molding powders (Table 15.18). These find use mainly in electrical parts such as switches, wall plates and receptacles, circuit breakers, electric blankets, handles and knobs. 

---