Daily press. [volume] (Newport News, Va.) 1896-current, 1906-12-08
THE MAKING OF GLUE
MATERIALS WHICH PRODUCE THIS
USEFUL SUBSTANCE.
Waste Erom Hides, Horns and Hoofs
of Animals Is Used, but tho stncvs
OF Animals slaughtered F,er Food
Give the Beat Results.

OF Animals Slaughtered Fer Food
Give the Dcst Results.
Few substances are more generally
useful than glue. At one time or IN.
other nearly every householder hns to
use 1t, yet few persons know anything
about the different kinds or which Is
best FOR the purpose in hand.
For ordinary repairs to articles OF
wood, especially If no severe strain Is
to be placed upon the object. the pre-
pared CLUES are convenient aud ade-
Quutc. They are therefore often chosen
III preference to the old fashioned sort.
But FOR strength and durability nc glue
which is applied cold can compare with
the kind that Is first melted III glue
pot and then applied hot. and OF this
kind there arc many grades, which
vary greatly In quality.
Tho manufacture of hard glue, as 1t
Is usually called-that Is, glue which Is
to be used hot-is to n large degree the
utilization of waste products. The raw
materials are pieces aud scraplngs from
hides, chips and dust from horn work.
ing factories, parlngs from hoofs and.
best of NIL, snews from animals killed
FOR food In the great slaughter houses.
The first process Is II soaking In lime
water. made thick enough to be called
milk OF line" In this bath tho slncws
and other glue material remain for two
weeks or more, In order that all tho
grease and blood may be eaten away.
but Immediately on removal the ma
terial Is exposed to currents OF mir,
which allow any adhcring lime to nb-
6orb carbonc acid. This checks the ac-
ton of the nllinli on the animal matter
aud makes it possible to keep the ma
terInl In the dry state for nm indefinite
period or until It Is desired to use It.
Previous TO boiling, the scrap Is again
immersed for twenty-four hours In
bath of milk of lime. 1t is then
placed in caldron built OH the plan
Of the housewives familiar double boil
cr. This kind OF vessel Is necessary to
prevent burning on." Water Is ndd-
cd, ana the mass is gently boiled until
Il firm gclatlnous liquid results from
cooling.
The clear portion Is now drawn or
from the first caltlron into second
vessel and Is known MS first run slnew
glue"-thc best of all. A small guam
tity OF alum dissolved in water Is ndd-
ed for the purpose of clarifying the
glue by causing II to precipitate Its i'm
puritcs.
III II second, double boiler the liquid
remains several hours. TIL 1t Is perfect
~ clear, and Is then run off into tho
congealing boxes, over The bottoms OF
which 1t spreads out In thin sheets.
The boxes are run into the cooling
rooms. where they remain until the
glue has hardened enough to be re-
moved In sheets, but not enough to be
brittle. In this state 1t Is ready to be
cut
The sheets are laid upon boards
which have previously been wet to
prevent the glue from sticking. Here
the cutting Is done with tightly stretch.
cd brass wires, us firkin of butter Is
cut by the country grocer.
After Il further drying OH revolving
netlinss the sheets are dipped In hot
water and rubbed with brush 10 give
them polish. They then pass to tho
kilns for the "stove drying" This re-
moves all moisture and leaves what mp.
pears to be Il sheet of translucent ycr
lowish brown hottie glass. Indeed, tho
best sinew glue seems on casual ex-
animation to be nearly us hard as
glass, and II quick, sharp blow will
produce q fracture that is clean cur
and rtreous. The best of this glue Is
i!ght in color.
The residuum left in the caldron
when the first run" of glue was drawn
OF is boiled and boiled again. so long
rs any gelatinous matter can be ex-
.ractcd from it. The product is glue
or inferior grades, Of course, but use.
FIJI as sizing and for other purposes in
various arts and industries Although
still clsssed rs sInew glue. the later
runs" have not the strength OF the
first run. They are darker and less
:"ansluccnt
Not many years ago nearly all the
best glue was sold In sheeta Today
by far the greater part Is ground Mt
the factories TO the fineness Of ordi-
nary sawdust. Since In this form 1t
disSnlHes more quickly. 1t is 50 pre-.
eerred by woodworking factories,
Thich use large quantities, but as tue
chances of adulterntion are greater
when the glue Is ground the purchaser
who wishes to be sure OF strength ond
durability will choose the sheets.-Ed-
ward Williston Frentz In Youths Com
canton.