Instructions in vapor process drying by Linn Allen Dawson 1845-

Author:Linn, Allen Dawson, 1845- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Lumber
Publisher: Grand Rapids, Mich.
Published: 1910-03-25T05:00:00+00:00

Normal Width . . 10.50 Absorption in grams 50

Bone Dry .... 10.35 Bone Dry " 46.2

.15^=1'' Expansion 3.8—8.4^c

The second test was made from a piece of 2" basswood which was never in a dry kiln, but had been in a building over 50 years. This was tested, as above, when removed from the building, with the following results:

Width 6.15' Weight in grams . 41.7

Bone Dry Width . . 5.05" Bone dry " 39

1.10" = 1.6% 2.7-7'/

Showing that there must be in the neighborhood of I'/i shrinkage and from 5'/, to 8'a evaporation above the bone dry test in the lumber when coming from the kiln to be at rest in the normal atmospheric conditions in the factory.

The following tests were made from samples gathered from a wide range of territory, dried by different processes and types of kilns. We do not know the exact number of days required to dry or the time since they were dried, but we offer these as samples of what we find in the different factories and processes of manufacture. No. 1 is O. K., No. 2 shows case hardening by the excess of evaporation over the percentage of shrinkage. No. 3 shows that the evaporation is O. K., but to get the proper-shrinkage, this should have remained in the kiln at least 24 hours more.

No. 1 1" Oak 4.65 "=2.1 W Evaporation 14.2=9.2% as used as inter-4.55" 13.2 ior finish.

No. 2 1" Oak 6.43" =1.2 % Evaporation 23 =9.5''/ as used as inter-6.34"=Bone dry 21 ior finish.

No. 3 1" Oak 8.1 "=3.26% Evaporation 31 =8. '>; 7.85" 28.7

No. 4 1" Oak 9.75"= .72% Slightly case 36.5=5. % furniture or cab-9.68" hardened 34.5 inet work.

No. 5 1" Oak 6.63"= .75'/. Too dry for 39 =2.63% 6.68" immediate 38

use, should

remain in dry storage, shrinkage to scant. No. 6 1" Oak 5.85"=2.27% Shrinkage 24 =4.3 % 5.72" dry down 23

nearly 1%

No. 7 1" Oak 12.8 "=1.1 % all right 62 =3.33% 12.65" 60

No. 8 1" Pop. 7.18"= .7 % This will 27 =6. % Clock Work 9.98" expand IS 25.5

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.