(48)
From the tables the following conclusions can be drawn.
(1) Processes which do not require the use of the glazer give very slight
distortions below 0-5% with satisfactory anisotropy.
(2) The use of the drying glazer gives strongly anisotropic distortions which
reach 1 - 5 or 2%.
(3) The wiping which precedes the glazing has much less effect than the
glazing itself.
(4) The direction of the paper is of little importance.
(5) Eight days conditioning after drying reduces the shrinkages brought
about by drying without the glazer and increases the expansions caused
by the glazer.
(6) Fast drying on a rotary non-glazing dryer introduces distortions of the
same order as those resulting from natural drying, but the isotropy of
the paper leaves room for improvement.
It was found that the distortions of glazed prints could be considerably
reduced by rewashing them for one-half hour and letting them dry naturally.
The results of this procedure are shown in the following table.
Measurements Taken by I.G.N., France, After Prolonged Washing of Prints
Originally Glazed, Followed by Natural Drying
B. G. Kodak-Pathe Riviera Guilleminot
Lengthwise
Lengthwise
Lengthwise
Lengthwise
Condition of the Print
Measurements
Measurements
Measurements
Measurements
taken on 22 cm
taken on 16 cm
taken on 16 cm
taken on 22 cm
8 days after glazing and before rewash
expansion
expansion
expansion
expansion
ing.
+0 -5 mm
+2 -7 mm
+0 -2 mm
+3 -3 mm
+0-23%
+ 1-69%
+0-12%
+ 1-51%
1 day after natural drying following up
shrinkage
expansion
shrinkage
expansion
a half hour washing.
-0-2 mm
+0-7 mm
-0-2 mm
+1 -2 mm
-0 09%
+0-44%
-0-12%
+0-55%
Result of a stroke of the hot press for
shrinkage
expansion
shrinkage
expansion
flattening.
-0-8 mm
+0-1 mm
—0'3 mm
+0-9 mm
-0-36%
+0-06%
-0-19%
+0-41%
After 8 days in a state of equilibrium
shrinkage
expansion
shrinkage
expansion
with the surrounding atmosphere.
-0-8 mm
+0’2 mm
-0-25 mm
+0-8 mm
-0-36%
+0-12%
-0 16%
+0-36%
Fig. 15 Photoelec laboratory printer
Fig. 16 S.A.C.A.P. portable printer
