Thesis (M.A.Sc.)--University of Toronto, 1992.
|Series||Canadian theses = Thèses canadiennes|
|The Physical Object|
|Pagination||2 microfiches : negative.|
Paper is a thin sheet material produced by mechanically and/or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying. Although paper was originally made in single sheets by hand, almost all is now made on large machines Density (ρ): From 10 gsm to gsm. Mechanical pulping is the original form of pulping. It has been largely replaced by chemical pulping, is still used for lower grade papers such as newsprint, and is the only process used for recycled paper (Casey, a).Mechanical pulping relies more so on mechanical actions to separate and develop wood fibers, rather than using chemical means. 6 | Fisher® Pulp and Paper Solutions Control Valve Selection and Design Selecting a control valve is more of an art than a science. Clearly, a single product design is not sufficient for the wide variation of applications across the entire pulp and paper process. Emerson uses multiple approaches to address application-specific Size: 2MB. Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibers from wood, fiber crops, waste paper, or with water and other chemical or plant-based additives, pulp is the major raw material used in papermaking and Pulp category: Production [M ton].
Refining (i.e., mechanical beating of pulp) is a common procedure that is used in paper-making to improve the mechanical properties of the final product. The improvements caused by refining are mainly attributed to increased density and to a better bonding between fibers. In this work, we study how various mechanisms that can be triggered by refining affect the tensile behavior of the by: 2. However, paper fashioned using chemical pulping exhibits higher mechanical paper properties . Mechanical pulping is mostly used due to its lower cost and higher pulp yield factors [9, 27].Author: Pratima Bajpai. In this review, characteristics of mechanical pulp fines, their generation, research methods and effects on paper properties are reviewed. A characterization strategy for fines is proposed. View. Chemical pulp fines are an important component in papermaking furnish. They can significantly affect the mechanical and optical properties of paper and the drainage properties of pulp (Retulainen et al. ). Characterizing the fines will therefore allow a better understanding of the role of fines and better control the papermaking process and Cited by:
Mechanical pulps were prepared from spruce wood chips treated with C. subvermispora CZ-3 for 14 days. For preparation of pulp, a wing defibrator was used in batchwise operation with g dry chips. The refiner is a low intensity type, allowing high repeatability at constant refining consistency, adjustable temperature, pressure and refiner speed. relative cost of the bleaching chemicals, type and condition of the pulp, desired brightness of the paper to be produced, and sometimes in response to environmental guidelines and regulations. Bleaching of mechanical pulp is much different than that for chemical pulp. Mechanical pulping leaves the lignin and the cellulose intact, whereas the. Pele Oy Fiber type and wet end runnability Printing papers with mechanical pulp have better runnability on paper machine than woodfree grades. The main reason is that mechanical pulp fibers are stiffer in wet condition. The good tensile stiffness of the wet fiber network is mainly due to elastic pressure and friction forces between fibers. It. The use of duplex stainless steels has grown rapidly in the last 10 years, particularly in the oil and gas industry, chemical tankers, pulp and paper as well as the chemical industry. In all these examples, topics like welding, corrosion resistance and mechanical strength .