Tangential shrinkage

Pretreatment [ WPG [ Acetyl Tangential swelling % Tangential shrinkage % ASE... 

Figure 16. Experimental points and fitted curves of longitudinal and tangential shrinkages o/Pinus jeffreyi as functions ofjfibril angle 0. (Adapted...

The axial, radial and tangential shrinkages, which together account for the volumetric shrinkage, are directed by features of wood structure that resist shrinkage, e.g. the quantity of ray tissue in the radial direction, or by features of the... 

In this theory the difference in radial and tangential shrinkage of many species grown in the temperate zone is attributed to differences in density of early and latewood. The shrinkage of dense latewood cells is greater than that of earlywood. 

Figure 4.6. Relationship between microfibril angle and longitudinal and tangential shrinkage in Pinus jeffreyi (Meylan, 1968).

Figure l.--An illustration of variation in individual tangential shrinkage values of several boards of Douglas-fir from one locality, dried from green condition ( ). (ML85 5194)... 

Figure 2.--Characteristic shrinkage and distortion of flats, squares, and rounds as affected by the direction of the annual rings. Tangential shrinkage is about twice as great as radial (30). (ZM 12494F)...

Figure 4. Tangential shrinkage ratio of old and recent xjoood as a function of residual density, from the data of Table IV.

However, the increase in PEG concentration to 100% had a marked effect on shrinkage. The average tangential shrinkage of the oak pieces was 9.9% at 100% PEG, about four times as large as at 70% PEG concentration in the preservation solution. 

More investigations are necessary to formulate flexible polyester resins that produce a nontacky surface after air irradiation. Flexibility is important in order to reduce the radial and tangential shrinkages. No air inhibition is important in obtaining a good surface consolidation. 

Figure 3. Longitudinal, radial, and tangential shrinkage of redwood heated at 1°C/min...

Transverse Plane for Some Species Radial Shrinkage Tangential Shrinkage ... 

Quartersawn sections, which include the pith, present a nonuniform thickness once dried near the pith, the thickness shrinks along the radial direction whereas the tangential shrinkage is involved elsewhere... 

---