Affordable Access

Some observations on raised grain

Publisher
Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory
Publication Date

Abstract

3 6 3011 1 SOME OBSERVATIONS ON RAISED GRAI N February 193 2 No. 81012 UNITED STATES DEPARTMENT OF AGRICULTURE FOREST SERVIC E FOREST PRODUCTS LABORATOR Y Madison 5, Wisconsi n In Cooperation with the University of Wisconsin 5 'SORE OBSERVATIONS ON RAISED GRAIN- By . . ARTHUR KOEHLER,- Principal Xylotomist , In,Charge, Section of Silvicult.ural Relations r - , Woodworkers and finishers-are confronted with certain difficultie s classed under the category of "raised grain" which so far have resiste d 'satisfactory solution . This paper describes some observations on raised graih that may'lead to"a'better understanding of the problems which i t presents and which may Suggest approaches to overcoming it . Two types of raised grain ar e 'comMonly ' recognized and spoken of a s such: (1) That in whichfibers'or parts of fibers project above the su r face, and (2) that in which the whole summerwood (or springwood) of th e annual rings extends above the surface, giving it a corrugated appearance . A third type in which the tips or edges of annual rings become loose an d rise up, also occurs . It is more commonly known as "loosened grain," whic h probably is a better descriptive term, and, in fact, has been accepted - as a standard term under American Lumber Standards : Under the first of these types of raised grain there is_one for m in which individual fibers, groups of fibers,' or even fragments have been ' loosened at one end, and'these ends project like fuzz or minute sliver s from the surface after planing or sanding (fig . 1) . This phenomenon seems to be a characteristic of certain kinds or types of wood rather tha n of the method. Of surfacing them. For example, in some species, such a s cottonwood and elm, it occurs commonly, whereas in mahogany, oak, an d certain other species of hardwood, it is troublesome in only certain type s of lumber. Whether in such cases the fibers are not equally well attache d by growth along their full length or whether they are more interlaced

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

Some observations on twin grains in as-grown iron...

on Journal of Crystal Growth Jan 01, 1974

Some Observations on Electron Micrographs of Quart...

on The Ohio journal of science Mar 01, 1971

Some observations on interface morphology and sub-...

on Journal of Crystal Growth Jan 01, 1982
More articles like this..