Paper Removal

Paper labels often are attached to plastic products. The paper is generally removed first. Two approaches are currently practiced. One uses a fluidized bed and the other uses a cyclone. Both of these approaches are gravimetric. Thus, it should be kept in mind 

In the fluidized bed, air is fed into the bottom and the feed enters near the middle of the bed. When the lifting force of the air overcomes the force of gravity, the particles rise. The lightest particles are pushed out the top and the heaviest sink to the bottom, where they are ranoved. The particles exist in a gradient throughout the column. Several cuts can be taken from the bed. 

Fluidized beds offer more flexibility than cyclones in that more than one cut of material may be taken. This is valuable if partial recycling of the product stream is necessary. However, a second cyclone may be used if the first is not effective enough. Indeed, the use of a sequence of cyclones is a standard approach to many separation operations. Being more complex, fluidized beds are more expensive. There is a trade-off between price and efficiency 

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With paper removed, the base of the cylinder was placed on a sheet of pasteboard and held fast by a pin driven vertically thru its center. After conditioning at 29—32° (85—90°F) for 144 hrs, the height of the cylinder was measured. If it did not shrink more than 25% of its original height, the Dynamite passed the test. Another condition of acceptability was that the upper cut surface retain its flatness and sharpness of its edges... 

A piece of positively charged white paper removes the toner from the semiconductor film and hence acquires an image of the black parts of the original. Finally, the paper is heated to melt the plastic coating and fix the ink. 

When all of the target DNA is trapped on the paper, remove it from the gel. Using forceps, transfer the paper to a 1.5-mL microtube. 

In a 100-ml conical flask place 5.5 g (0.015 mol) of methyl 2,3,4,6-tetra-O-acetyl-/ -D-glucopyranoside (Expt 5.111), 50 ml of dry methanol and 10ml of a solution of sodium methoxide in methanol previously prepared by the cautious addition of 0.1 g of sodium to 20 ml of methanol. Stopper the flask and allow the solution to stand for 1 hour, then add sufficient ion exchange resin [Zeolite 225 (H )] to render the solution neutral to moist universal indicator paper. Remove the resin by filtration, wash with methanol and evaporate the combined filtrate and washings under reduced pressure (rotary evaporator). Triturate the colourless syrup with absolute ethanol to cause it to solidify and recrystallise from absolute ethanol. The pure methyl / -d-glucopyranoside has m.p. 108-109 °C, [oc]d° —30.2° (c2.8 in H20) the yield is 2.4 g (83%). 

Triantafyllou et al. (2005), in studies on transfer of potential contaminants from paper and board to food, measured partition coefficients between packaging and air for a range of substances. This was, therefore, an attempt to measure the potential for gas-phase transfer. A mixture of acetophenone (b.p. 203 °C), naphthalene (b.p. 218 °C), benzophenone (b.p. 306 °C), dibutyl phthalate (b.p. 340 °C) and methyl stearate (b.p. 443 °C) was placed in a vial together with samples of test liner made from virgin fibres or triplex board made from 100% recycled fibre. There was no contact between the substances and the paper or board. Vials were sealed and heated at 70 °C or 100 °C and then the paper removed and analysed for uptake of substances. Conclusions from the studies were that ... 

The most sensitive test for purity of the dye is the capillary test, depending on the fact that the red impurity is more soluble in water than the blue compound and less readily adsorbed by filter paper. An amount of press cake corresponding roughly to 0.05 g. solid dye is dissolved in 200 cc. of water in a 400-cc. beaker, 0.5 g. of common salt is added, and the temperature raised to 95°. A 2 by 15 cm. strip of filter paper is immersed in the liquid and is supported on a stirring rod pushed through it and placed across the top of the beaker. The temperature is maintained at 95° for fifteen minutes and the filter paper removed. Any red impurity will show plainly above the blue. If pmifica-tion is found to be incomplete, fiuther resalting will produce a pure product. 

Since the process is complex and poorly understood, this first model was a simplified one with several limitations. The primary limitation was its restriction to digesters with a constant pH. The model presented in this paper removes this limitation by considering the interactions which occur in and between the liquid, gas, and biological phases of the digester. Consideration of these interactions permits the development of a model which predicts the dynamic response of the five variables most commonly used for process operation (1) volatile acids concentation, (2) alka-... 

When the level of the liquid has advanced through most of the paper, remove the paper from the developing solution. Hold up the paper and observe the colors. 

When the solution is about half an inch from the top of the chromatography paper, remove the paper and mark the progress of the solvent using a pencil. 

The Larock synthesis was used by Chen and co-workers to synthesize the 5-(triazolyl-methyl)tryptamme MK-0462, a potent 5-HTjn receptor agonist, as well as a metabohte [366], Larock employed his methodology to prepare tetrahydroindoles [367], and Maassarani used this method for the synthesis of /V-(2-pyridyl)indoles [368]. The latter study features the isolation of cyclopalladated Y-phenyl-2-pyridylammes. Rosso and coworkers have employed this method for the industrial-scale synthesis of an antimigraine drug candidate 331. In this paper removal of spent palladium was best effected by trimer-captotriazine (332) although many techniques were explored [369]. 

Paper Removal. PET, HDPE, and aluminum cover a particularly wide distribution of densities. Paper, poly(vinyl acetate), and HDPE have densities which are quite similar, though. However, the paper chips are the lightest of all components, even if they are not the most dense. This is because the paper is the thinnest component present the others are all of rather thick construction. 

To make incendiary paper, soak strips of ordinarj Avriting paper in the phosphorus-carbon disulfide for a few minutes. Remove the paper with a pair of tweezers or tongs and place in a vial filled with water. Be sure to wash off the tweezers immediately in copper sulfide solution. Cap the vial and store until ready to use. To use this incendiary paper, remove the strips of paper with a pair of tweezers, and place among the material to be ignited. 

Sodium dithionite Bleaching textiles, pulp and paper removing rust stains... 

Cut long strips of coffee filter paper, remove the tops from the jars, and place one into each jar, with one end in the alcohol, and the other end outside the jar. 

Chem. Descrip. Dioctyl sodium sulfosuccinate, 19% water, 11% ethanol Uses Wetting agent for industrial applies., emulsion polymerization of VA, adhesives, paints, textiles, agric., cosmetics, glass cleaners, mining, water treatment, wall paper removal, food pkg. plants food pkg. adhesives, coatings, paper, cellophane, textiles emulsifier in mfg. of food-contact articles defoamer in food-contact paper/paperboard Regulatory FDA 175.105, 175,300, 175.320, 176.170, 176.210, 177,1200,177.2800,178.3400 ERA compliance Properties Colorless clear liq. sol. in polar and nonpolar soivs. m.w. 444 sp.gr. 1.08 dens. 9.0 Ib/gal cloud pt. < -5 C flash pt. (RMCC) 82 F pH 6.0 (10%) surf. tens. 29 dynes/cm (0.1%) Ross-Miles foam 220 mm (0.1%) anionic 70% act. 

A paper based on carbon fiber can be made using a conventional paper making plant, where chopped fiber is dispersed in a liquid carrier (normally water) containing wetting and binding agents. The dispersed fiber is removed from the slurry by vacuum deposition onto a perforated screen, washed and the carbon paper removed from the screen and dried. If a water flume is used to spread the fibers, then it is possible to give a product with more than 80% fiber orientation. Paper is used for specialist applications like loudspeaker cones. 

Additional viscosity measurements made after a total of 20,30, and 40 minutes of circulation showed almost no viscosity variations. Again, the filterability of the fluids varied significantly. The fluid removed after 10 minutes of circulation had a filtrate volume of 148 milliliters in 30 minutes. The filtration rates increased as the fluid circulation time increased. Ultimately, the filtration volume reached 300 mis (the fluid cell volume) in under two minutes. The filter papers removed from these tests also showed a wide variation in the amount of polymer that was removed. The fluid circulated for only 10 minutes had between 1/16 and 1/8 inch accumulation on the paper. While fluid circulated for 40 minutes showed no measurable amount of polymer present on the paper. 

Expanded plastic (foams etc.) Do not use solvent Roughen the surface with emery paper Remove all dust and contaminants... 

Plaster If plaster is fresh, allow to dry thoroughly Smooth the surface with fine-grit emery paper Remove all dust before applying adhesives... 

When the gel has polymerized, remove the comb and clean the top of the gel with a strip of Whatman 3MM paper. Remove the clamps as well as the horizontal spacer at the bottom with the aid of a spatula. Clean the space between the two glass plates using a thin spatula covered with tissue paper. 

During the life of a road, the surface layer and drainage systems will keep the foundation dry but end-of-life conditions also need to be considered. The ability to use plasterboard without paper removal is a key aspect of this work. 

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