﻿PHILIPPINE FIBERS. 



93 



Both the cupang and the bamboo fibers were of good appearance 

 throughout, soft and nearly as white as bleached pulp. The bamboo pulp 

 consumed 16.8 per cent of bleaching powder in two treatments; the 

 yield of pure, bleached cellulose being 45.3 per cent. See Table No. 8 

 for the bleach consumption and yield of bleached cupang fiber. Analyses 

 of both pulps in the unbleached state are given in Table No. 9. 



Table No. 9. — Analyses of unbleached sulphite fibers prepared by the quick-cooking 



process. 



Moisture 

 (loss at 

 100° C). 



Resins 

 (solution 



in 

 alcohol). 



Hydrocel- 



lulose 



solution 



in 1 per 



cent 



alkali. 



Cellulose. 



Non- 

 cellulose 

 (legrin) 

 by differ- 

 ence. 



Mineral 

 matter 

 (ash). 



Lauan... 

 Mayapis. 

 Cupang.. 



Dwarf bamboo 



Jute (old bagging) 



Manila hemp (old rope). 

 Spruce" 



Per cent. 

 9.20 



9.08 

 8.57 

 S.OT 

 8.03 

 6. 13-6. 70 



Per cent. 



0.91 



.63 



.50 



Per cent. 

 5.77 

 6.29 

 4.16 

 9.04 

 6.94 

 8.93 

 12.02 



1. 52-4. 25 



Per cent. 

 81.42 

 80.57 

 82.60 

 72.36 

 78.68 

 79 



77.40 

 81. 31-89. 74 



Per cent. 

 2.19 

 3.31 

 3.04 

 4.37 

 3.67 

 3.47 

 1.95 

 . 73-9. 37 



Per cent. 



0.51 



.32 



.71 



5.15 



2.14 



.53 



.60 



.33-1 



"The figures for sulphite spruce fiber are the extremes found by Griffin and Little on analysis of 

 four samples of unbleached pulp prepared by the quick-cook process. 



MANILA HEMP OLD ROPE. 



Very dirty, 3-inch cable rope cut down and well cleaned and dusted by 

 hand, lost 21 per cent in weight. 



Experiment 1. — Digested with a straight bisulphite liquor containing 3.54 per 

 cent total sulphurous acid. A temperature of 140° C. was reached in two hours 

 and held at 140° to 145° C. for four hours more. The fiber was nearly white, 

 clean and strong; the yield of air-dry, unbleached pulp was 72 per cent, calculated 

 on the cleaned material, and 56.88 per cent calculated on the original weight of 

 the rope. 



Experiment 2. — 3.75 kilos (7.5 pounds) of rope prepared as above and 1.25 

 kilos (2.5 pounds) of new jute bagging were digested with 15.12 liters (4 gallons) 

 of calcium bisulphite liquor of 3.5 per cent total sulphurous acid content. A 

 maximum temperature of 145° C. was reached in less than two hours and 

 maintained for a total period of six hours. The pulp was clean, grayish and 

 long fiber ed. 



The yield unbleached was as follows: Rope, 71.5 per cent; jute, 62.6 per cent. 



Experiment 3. — 3.75 kilos (7.5 pounds) of rope of good quality which lost 

 approximately 10 per cent in cleaning and 1.25 kilos (2.5 pounds) of very old 

 jute bagging were digested with a bisulphite liquor of the following composition : 



Per cent. 



Total sulphurous acid 3.55 



Sulphurous acid combined as monosulphite 1.365 



Available acid 1.185 



