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Cork insulation; a complete illustrated textbook on cork insulation ...

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USES OF CORKWOOD AND CORK WASTE 21<br />

from <strong>on</strong>e-eighth to <strong>on</strong>e-quarter inch, and from these sheets<br />

the natural <strong>cork</strong> disks are punched. A great deal of <strong>cork</strong><br />

waste results from this manufacturing process, and its utiliza-<br />

ti<strong>on</strong> is important enought to form virtually a separate branch<br />

of the <strong>cork</strong>wood industry.<br />

The manufactured stoppers and disks must, in their turn,<br />

be sorted as to grade and quality. They are then washed<br />

and bleached by soaking in water and a chemical, and are<br />

-CORK PU>-CHINGS— DISKS RExMOVED.<br />

then dried by spinning in a perforated centrifugal cylinder<br />

mounted within a metal jacket c<strong>on</strong>nected to a drain. Some<br />

stoppers, usually "straights", and all disks, are given a bath<br />

of hot paraffin, or glycerine and paraffin, which improves their<br />

resistance and retards discolorati<strong>on</strong>, the operati<strong>on</strong> usually<br />

being d<strong>on</strong>e in a steam jacketed kettle and then "tumbled" to<br />

remove the excess water and paraffin.<br />

15.—Artificial <str<strong>on</strong>g>Cork</str<strong>on</strong>g>.—The working up of the waste from<br />

<strong>cork</strong>wood, and virgin <strong>cork</strong>, which is classed as waste, into<br />

many products of utility and value is probably the most im-<br />

portant phase of the <strong>cork</strong> business today, just as the success-

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