Fabrication Bag

Dry Cleaning. In colorfastness to dry cleaning, ISO 105-D01 a specimen of the textile is placed in a cotton fabric bag together with stainless steel disks and agitated in perchloroethylene (30 min, 20°C) and the effect of the shade and the color of the solvent assessed using the grey scale. 

Figure 4-67. Pulse-jet air cleaning of fabric bags. By permission, Power, November 1975, McGraw-Hill Co., Inc., New York, p. 41.

The separation step requires (1) application of a force that produces a differential motion of the particles relative to the gas, and (2) sufficient gas-retention time for the particles to migrate to the collecting surface. Most dust-collections systems are comprised of a pneumatic-conveying system and some device that separates suspended particulate matter from the conveyed air stream. The more common systems use either filter media (e.g., fabric bags) or cyclonic separators to separate the particulate matter from air. 

Reverse-flow-cleaned filters are similar to the shaker-cleaned design, except the shaker mechanism is eliminated. As with shaker-cleaned filters, compartments are taken off-line sequentially for cleaning. The primary use of reverse-flow cleaning is in units using fiberglass-fabric bags at temperatures above 150°C (300°F). 

All targets in these tests were secured to a post located in 4 ft of water. Targets were suspended from the post by a rope so that the targets were approximately 1 ft from the seafloor. For initial tests, a target was constructed using a commercially available TNT simulant. The simulant consists of TNT coated onto particles of sand, but the quantity of TNT in the simulant is insufficient to sustain a detonation. This target was placed inside a water-permeable fabric bag and was affixed to the pole as previously described. 

Sample Preparation for Liquid Polyethylene Glycols Carefully introduce 25.0 mL of the Phthalic Anhydride Solution into a clean, dry, heat-resistant pressure bottle. Add an accurately weighed amount of the sample equivalent to its expected average molecular weight divided by 160 to the bottle. (Thus, a sample of about 1.3 g would be taken for Polyethylene Glycol 200, or about 3.8 g for Polyethylene Glycol 600.) Stopper the bottle, and wrap it securely in a fabric bag. 

Procedure Immerse the sample bottle in a water bath, maintained between 96° and 100°, to the same depth as that of the mixture in the bottle. Heat in the water bath for 30 to 60 min, using 60 min for Polyethylene Glycols having molecular weights of 3000 or higher, then remove the bottle from the bath and allow it to cool to room temperature. Uncap the bottle carefully to release any pressure, remove the bottle from the fabric bag, add 5 drops of a 1 100 phenolphthaleimpyridine solution, and titrate with 0.5 N sodium hydroxide to the first pink color that persists for 15 s, recording the volume, in milliliters, of 0.5 N sodium hydroxide required as S. Perform... 

AP C pressure drop through the filtering cloth in a fabric bag filter Pa... 

It seems impossible that a light fabric bag can lift such a weight. It does so because the air inside the fabric bag or balloon is hotter than the outside air iuid the density of the heated air is much lower. Children s helium balloons float attached to their strings because the density of helium at room temperature and pressure is less than that of air. Release them from their strings and they will float off high into the sky - causing great distress to the children ... 

Don t use new plastic bags every time you shop. Instead, take a couple of strong jute or fabric bags with you—or use a backpack, which is the best way to carry the load and maintain your posture. 

Film used to fabricate bags is generally uniaxially oriented to improve its tensile strength, since most of the force on the bag, in use, is exerted in a vertical direction. Films used for pouches are often biaxially oriented because it is expected that tensile forces may act in both directions, and also because if shrinking occurs, the pouch should shrink in both directions. 

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