Free blowing

Patent Number US 5554661 A 19960910 CLOSED CELL, LOW DENSITY ETHYLENIC POLYMER FOAM PRODUCED WITH INORGANIC HALOGEN-FREE BLOWING AGENTS... 

With respect to preform design, optimization of bottle properties will result from using a slightly higher stretch ratio for PEN than for conventional PET. This is illustrated in Figure 12, which shows stretch ratios of PET and PEN of various IVs. The data were obtained by free blow experiments that were conducted at the... 

Some 90% of the total world PUR market is in foam. Foam results from the formation of gas bubbles in the polymerization process originally these were all CFCs, but the producers are moving rapidly towards chlorine-free blowing agents. There are three distinct types of PUR foam ... 

Ether. The most satisfactory method for the removal of (diethyl) ether is either on a steam bath fed from an external steam supply or by means of an electrically-heated, constant-level water bath (Fig. 77, 5, 1). If neither of these is available, a water bath containing hot water may be used. The hot water should be brought from another part of the laboratory under no circumstances should there be a free flame under the water bath. It caimot be too strongly emphasised that no flame whatsoever may be present in the vicinity of the distillation apparatus a flame 10 feet away may ignite diethyl ether if a continuous bench top lies between the flame and the still and a gentle draught happens to be blowing in the direction of the flame. 

Recovery Process. In past years iodine was recovered at Long Beach, California from oil field brine and from natural brines near Shreveport, Louisiana (36,37). The silver process was used. Silver nitrate reacts with sodium iodide to precipitate silver iodide. Added iron forms ferrous iodide and free silver. The ferrous iodide then reacts with chlorine gas to release free iodine. After 1966, the silver process was replaced with the blowing-out process similar to the bromine process. 

The blow-tank principle can be used to feed regular pneumatic conveyors. Use of an Airslide or other fluidizing device at the bottom of the blow tank permits handhug non-free-flowing materials. This... 

Whether the brushes are set concentrically on the slip-rings, and each individtial brush holder is set approximately 2-2.5 mm from the slip-ring surface. Slip-rings must be concentric and free from damage and blow holes. 

Due to the friction of dust or free snow blowing past the conductors. 

Silane drying Blow excess silane off panel with 30 psi dry, oil-free N2. Place in preheated 220°F (I04 C) circulating air oven for 1 h. Blow excess silane off panel with dry, oil-free Nr. Use heat lamps or other heating sources to maintain 200-220°F (93-104°C) for 1 h. Use appropriate thermocouples to assure temperature and uniformity. The time between silane application and stall of heating should be minimized and no more than 1 hour. 

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