Download Wood Coatings Theory and Practice by Franco Bulian PDF
By Franco Bulian
Wooden Coatings addresses the criteria accountable for the functionality of wooden coatings in either family and business occasions. The time period 'wood coatings' covers a extensive diversity of goods together with stains, varnishes, paints and aiding ancillary items that could be used interior or outdoors.
Techniques for coating wooden return many centuries yet in contemporary a long time there was a stream in the direction of extra environmentally-friendly fabrics, for instance, using water-borne instead of solvent-borne chemicals.
A significant target of wooden Coatings is to give an explanation for the underlying components that impact choice, software and normal operational matters. uncomplicated info at the chemistry and know-how of coatings is incorporated for the good thing about scholars and laboratory technicians. also, the publication contains person chapters of curiosity to architects, specifiers, and business users.
* bargains updated assistance on present availability and utilization of wooden coatings
* offers the reader with a simple knowing of either coating and substrate interactions
* Covers either architectural (trade and DIY) and commercial sectors
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Extra info for Wood Coatings Theory and Practice
Example text
Impregnated papers Impregnated papers can be produced in different colours and patterns (including wood patterns), and due to their relative low cost and versatility are often used as covering materials for wood-based panels. There are two main classes of papers, usually called the ‘melamine’ and the ‘finish’. 1. Melamine impregnated papers The structure of melamine impregnated paper is illustrated by Fig. 15. The paper is impregnated with a thermosetting melamine or ureic resin to close all the paper pores.
Most are from the Basidiomycetes group. They attack both lignin and cellulose and are less restricted by nitrogen availability. This group includes ‘wet’ rot (Coniophora puteana) and ‘dry’ rot (Serpula lacrymans). 2. Insect attack Some insects called xylophagous (from the combination of the two Greek words xylon ¼ wood and phagos ¼ to eat) can utilise wood as nutrition source. The effects on wood of such aggressions depend on the specific nutrients that the various organisms use. The most common form of insect attack is by wood-boring beetles.
Dimensional movement of wood As described in the previous sections, cellulose is the main constituent of the wood cell walls. In absence of water, the polymeric chains are closed and entangled each other in consequence of the polar interactions deriving from the presence of several hydroxyl groups constituting the glucose structural units. The presence of water in the form of atmospheric humidity causes interactive competition since water is itself a polar substance. Water is able to penetrate through the cellulose chains binding to them and reducing the interactions among the polymer chains.