摘要:
A method of processing papermaking fiber includes characterizing the initial color of the pulp and the color of the pulp after treatment with a phloroglucinol stain. The color response of the pulp to the stain has been found to be a better indicator of processing needs for secondary pulps in particular and in any event is selective for untreated groundwood as opposed to conventional groundwood identification methods. The color difference is used to target a suitable product for the pulp, to aid in bleaching/deinking strategy or to enable optimization of fiber blending for particular products. In a preferred embodiment the process includes determining changes in CIE L*, a*, b* and brightness values before and after staining of the pulp.
摘要翻译:处理造纸纤维的方法包括用间苯三酚染色处理纸浆的初始颜色和纸浆的颜色。 已经发现纸浆对染色剂的颜色响应特别是二次纸浆的加工需要的更好的指标,并且在任何情况下对于未处理的磨木浆是有选择性的,而不是常规的磨木鉴定方法。 色差用于将纸浆的合适产品定位,以帮助漂白/脱墨策略或使特定产品的纤维混合物达到最佳化。 在优选实施方案中,该方法包括确定在纸浆染色之前和之后的CIE L *,a *,b *和亮度值的变化。
摘要:
A deinking method using a cellulase which enables the load upon the environment to be reduced; and an evaluation method whereby a cellulase effective in deinking and the effective addition level of the cellulase can be appropriately determined. By proposing pulp-swelling activity (PSA) that elevates the water-retention value of pulp after pulp is reacted with cellulase, it becomes possible to select an enzyme that is effective in cellulase-deinking treatment without lowering the paper strength and to determine the effective enzyme dosage. Namely, a method of deinking waste paper is provided wherein the selection of an effective cellulase and the optimization of the enzyme dosage with the use of PSA as an indication make it possible to minimize the cellulase addition level and lessen the amount of the deinking agent.
摘要:
A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process where the pulp suspension containing dirt particles is sprayed into a tank together with air. The air is injected at a minimum of two successive points and mixed with the suspension.
摘要:
Ethyleneamine compound(s), or mixtures thereof, are used in effective amounts to reduce or inhibit the deposition of white pitch on the paper making equipment during the processing to recycle coated paper.
摘要:
A mixing device in the form of a centrifugal pump is used to mix gas (typically air) with liquid (typically effluent water, dispersion water, or waste paper pulp suspension, etc.). The pump is provided with a common inlet conduit for both the liquid and the gas so that liquid and gas flow freely and in an arbitrary ratio into the pump, that is there is no controlling or adjusting of the flows. The gas is allowed to either dissolve in the liquid or be mixed as small bubbles with the liquid, and any surplus gas is separated from the mixing device (e.g. by holes in the pump impeller leading to a rear portion of the pump which is attached to a vacuum source, such as a liquid ring pump). The liquid and gas dissolved therein, and small bubbles mixed therein, are discharged from the mixing device at a pressure that is raised from the inlet pressure, due to the action of the impeller, which pressure development enhances the dissolution of gas in the liquid. Treatment chemicals, such as flotation-enhancing chemicals, can be added to the liquid before it enters the centrifugal pump, and the outlet from the pump may be connected to a flotation tank or the like.
摘要:
A method of deinking paper includes applying a deinking solution to the paper to be deinked; the deinking solution being comprised of a cleaning solution and a surfactant; abrading the paper to remove the ink from the paper; and washing the paper to remove the deinking solution from the paper.
摘要:
A process for recycling fiber products employs an aqueous deinking medium containing an effective amount of a collector chemical. The collector chemical comprises a surface active agent which is or can be derived from lanolin. Alkoxylated lanolin derivatives are preferred.
摘要:
A process for increasing a degree of whiteness of paper pulp may include bring paper fiber pulp, which may at least partially include printed waste paper, into a suspension with water. The suspension may be mixed with bleaching aids and bleaching chemicals. The bleaching chemicals may preferably contain molecular oxygen. Intensely mechanically treating the pulp, e.g., at at least 20 kWh/to, prior to bleaching the pulp suspension. The bleaching period may take at least 10 minutes, with a pressure above the atmospheric pressure being exerted during the bleaching. After bleaching, a major portion of remaining color print particles may be removed from the bleached pulp.
摘要:
Composition and methods for inhibiting the deposition of organic contaminants from pulp in pulp and papermaking systems are disclosed. The methods add to the pulp or to the deposition prone surface of the papermaking system a composition comprising a polyvinyl alcohol having 50 to 100% hydrolysis, a high molecular weight gelatin having a molecular weight of about 100,000 or higher, and a cationic polymer.
摘要:
The composition comprises a polymer emulsion containing, for example, polyvinylidene chloride having a particle size distribution finer than 10.mu., and an additive with generally the same size distribution, for example aluminum silicte, calcium carbonate, polyvinyl acetate polystyrene, polyacrylates, in emulsion or powder form which is capable of interstitial combination with the polymer particles. The composition has a critical pH between about 2 and 7. The method of repulping coated packaging is also disclosed.