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Патент USA US3023706

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March 6, 1962
Filed March 21, 1958
Fredric/i 5. Burns
United States Patent ()?ice
Patented Mar. 6, 1962‘
noted that these noxious fumes from burning of the
impregnated scrap materials cause humans, after pro
longed exposure, to be adversely affected, i.e., the so
called “pitch burn.”)
The novel apparatus of the instant application obviates
the problems presently occasioned by scrap by both re
Fredrick B. Burns, West Allis, Wis., assignor to McGraw
Edison Company, Milwaukee, Wis., a corporation of
covering the pitch or other saturant from the ?brous ma
terial and permitting the reuse of both the pitch and the
?brous material.
Filed Mar. 21, 1958, Ser. No. 723,009
2 Claims. (Cl. 100-93)
This invention relates in general to apparatus for re
covering a congealed saturant from impregnated porous
matter in scrap form and more particularly relates to
This particular aspect of reusing the pitch is particu
larly signi?cant.
Some saturants such as pitch are of a
highly complex chemical nature. The preservative prop
erties of these saturants are inherently dependent on the
apparatus for recovering pitch from scrap pitch impreg
complicated chemical structures of these materials. It
nated ?brous material.
15 is an object of this invention to allow recovery of the
This invention relates to apparatus for recovering the
saturants by purely physical means to avoid upsetting
saturant from saturated ?brous or other porous conduit
the unique chemical balances of the saturants, thus re
covering the saturant in a form equally useful as in its
employed to conduct and protect underground cables,
telephone lines, electric lights, and other conductors and
original state.
for the formation of water pipes, drain pipes, irrigation 20
Some saturants, in particular pitch, possess an unusual
physical property inasmuch as they do not have a speci?c
pipes, etc., which is impregnated by a suitable saturant
liquifying point with regard to temperature. It is possible
to render the latter substantially waterproof and resistant
by certain physical means, for example the application
to abrasion and corrosion in conditions encountered
of heat, to reduce both the viscosity and surface tension
above or underground by the ?brous conduit, pipe, etc.
factors which control the degree of congealment of the
While as above stated, the invention is particularly di
rected to the recovery of the saturant of ?brous conduit,
This liquifying means alone is not su?icient to release
it is to be understood that it may be employed to recover
the saturant from any small ?brous or other articles
the saturant from the ?brous or porous structure of the‘
impregnated matter because there exists in addition a
which are similarly impregnated.
The basic ?brous matter which is impregnated with 30 physical attraction of the saturant for the ?brous or
porous matter.
the saturant may be, of course, prepared in any known
It has been found that by the application of pressure
manner. In most cases, the ?brous bases for tubes is pre
to the matter, in addition to the means for reducing the
viscosity and surface tension factor of the saturant, re-,
and the resulting stocks screened and then pumped to 35 moval of the saturant can be accomplished.
It is thus an object of this invention to provide a novel
paper machines and there formed into a wet sheet. The
apparatus for recovering congealed saturant from im
paper tubes may be formed by winding the wet sheet upon
pregnated porous matter in scrap form by heating the.
a cylindrical or other shaped tube or mandrel to produce
collected scrap to reduce the viscosity and surface tension
a wet conduit or tube of proper thickness. This conduit
may then be dried in kilns to remove the major portion 4.0 of the saturant and physically pressing the saturant there
of the moisture content preparatory to impregnation.
It is a further object of this invention to provide api-v
The ?bre base may also be prepared in any other known
paratus of the above general type which is continuous
manner. The tubes or articles are then impregnated in
in operation and includes metering the v?ow of scrap
any known manner utilizing a suitable saturant which
onto an endless belt, heating the scrap and pressing the
is normally congealed at the temperatures encountered
liqui?ed saturant from the scrap and then collecting the
in ?eld use of the saturated articles.
Porosity or absorptive characteristics of the walls of
liqui?ed saturant and the separated ?brous material. It is ‘a further object of the invention to provide ap
the ?brous conduits or articles may vary within wide
limits from the very dense wall of a density correspond
paratus of the type aforementioned which is simple in
ing to hardwood and exceedingly di?’icult to saturate to
operation, is easy to install and maintain and is other
a substantially porous open wall similar in density to 50 wise well adapted for purposes for which it was designed.v
that of roo?ng felt which will readily absorb bituminum
The novel features that are characteristic of the in
saturants. Various types of saturants may be used, for
vention are set forth with particularity in the appended
example, coal tar pitch, gas tar pitch, asphalt, cut back
claims. The invention itself both as to its organization
pitch or other water proo?ng material may be used as
and its method of operation together with additional ob
suitable and desired. However, in many applications, 55 jects and advantages thereof will best be understood by
it is preferred that coal tar pitch be used because of its
the following description when read in connection with
particular characteristics, and this coal tar pitch is quite
the accompanying drawing, which is a semidiagram
matic view of the automatic apparatus for recovering
pared from newsprint or paper pulp or other ?brous ma
terial which may be beaten in the usual paper beaters
As a certain percentage of the tubes are found to be
saturant from scrap materials.
defective after manufacture and thus have to be dis 60
Turning now to the drawing, a hopper means 25 is
carded, a certain amount of scrap is encountered. Fur
located above a traveling belt 26 and is adapted to con
ther, in order to make a connection between adjoining
tain and meter a flow of scrap thereunto. The belt 26 is
elongated tubes to form a continuous pipe or conduit, the
also a holder and is preferredly made of a ?ne mesh
ends of the various tubes are machined to receive the
screen having a plurality of interstices pervious to the
tapered end portion of the next adjacent tube. These
liquid saturant and impervious to the ?brous matter.
machining operations, of course, occasion much ?nely
The belt 26 also moves the metered ?ow of scrap to
divided scrap. Heretofore, not only has this scrap rep
resented a non-recovered cost but for many years the
ward suitable pressure rolls 2'7 and 28 located on the
upper and lower sides respectively of belt 26. Suitable
Burning of the scrap, on the other 70 idler rolls 39a ‘and 3% and return roll 24 are provided
to provide the constant movement of the belt as shown.
hand, provides noxious fumes which have severely im
It is noted that any one of the rollers may ‘be the driv
peded the unrestricted burning thereof. (It might be
disposal of this scrap material has posed problems in
storage and cartage.
ing member of the apparatus, the apparatus under dis
cussion being driven by roller 24 which is suitably con
many modi?cations thereof are possible. The invention,
nected to ‘a source of power’ not shown.
tated by the prior art and‘ by the spirit of the appended
Heating means 29 is shown associated with the larger
upper pressure roller 27 to heat same, the heat in turn.
being transmitted to the scrap on the belt. By using
suchan oversizecl roller for heating the scrap, a greater
effective heating area is provided. Furthermore, since
therefore, is not to be restricted except insofar as necessi
What is claimed as the invention is:
1. Apparatus for the continuous recovering of con—
lgealed coal tar pitch saturant from pitch impregnated,
cellulose-?bre scrap materials comprising hopper means
this larger roller has a greater mass it is more easily main
for containing and metering a ?ow of scrap therethrough,
tained ‘at the desired heating temperature. Heat may 10 a continuous belt type holder means disposed adjacent
also be supplied to the scrap in the hopper means 25
said hopper means to receive the scrap therefrom and
to preheat the chips and scrap so that the saturant (coal
having interstices pervious to said coal tar pitch when in
tar pitch) is in liquid form although still associated with
liquid form and impervious to the ?brous matter portion
the ?brous matter. The wringer means formed by pres
of the scrap, heating means to impart heat to said scrap
sure rolls 27 and 28 squeeze or compress the scrap 15 material and operable to raise the temperature of said
such that the liqui?ed saturant then is forced through
scrap to a point below 55 0° F. to liquify the pitch saturant
the interstices in endless belt 26 to be collected in the
without oarbonization of the cellulose matter, pressure
collector means 34 disposed therebelow. At the bottom
means in the form of a pair of pressure rolls disposed at
of the collector means 34 is a suitable outlet 34a which
opposite sides of said continuous belt type holder means
leads to container 36 which receives the recovered pitch 20 and being operatively associated with said holder means
35. As shown, de?ector means 38 is disposed on down
and scrap to effect compressive pressure on the latter and
stream side of the movement of the chip to de?ect and
thereby cause movement of the liqui?ed pitch through said
scrape upon the under side of the belt 26 to insure col
interstices of said holder means while retaining said ?brous
lection of the pitch that normally would adhere to the
matter, said heating means being the pressure roll dis
under side of the belt.
posed on the scrap receiving side of said continuous belt
Scraping means 30 is associated with the upper pres
type holder means, the heat applying pressure roll being
sure roll 27 to ‘scrape the ?brous material that tends to
of a substantially greater diameter than the opposed pres
adhere to the surface of the roll 27. Suitable de?ector
sure roll, ?rst scraper means adjacent the ?brous matter
means is provided so as to lead the scraped off ?bre mat
retaining side of said ‘holder means to scrape the ?brous
ter 31 into container 33. Suitable de?ector means 32 30 matter from said holder means, second scraper means ad
is provided to impinge upon the belt 26 near idler roll
jacent the pressure roll on the ?brous matter retaining side
39a so as to scrape the belt 26 clean. This recovered
of said holder means to scrape the ?brous matter from said
scrap 37 also leads to container 33.
pressure roll, and collection means adjacent said pressure
' In the actual process of separation of the saturant from
means and said holder means for collection of the sepa
the ?brous-matter, certain limitations in terms of temper
ature must be kept in mind. When, for example, the
porous matter is cellulose matter, it has been found that
heat should be supplied to the scrap until it reaches a
temperature just below the oarbonization point thereof.
rated saturant and ?brous matter, whereby substantially
unaltered pitch is separated from said ?brous matter.
2. Apparatus as described in claim 1 and having addi
tional scraper means adjacent the side of said holder
means opposite the ?brous matter retaining side to scrape
In actual test, it has been ascertained that a temperature 40 the liquid pitch therefrom.
of 550° F. carbonizes the cellulose matter to the point
that it deleteriously aifects the operation of the separating
References Cited in the ?le of this patent
process. On the other hand, a temperature of 500° F.
and pressure of 3,200 psi. produces a high yield of sep
aration. Further, it has been found that the yield in 45
creases with amount of pressure supplied vbut this factor
is dictated by commercial considerations. For example,
' Wilber ________________ __ Oct. 6, 1857
Booth ______________ __ Mar. 24, 1874
Seiler et a1 _____________ __ Feb. 13, 1894
5,100 p.s.i. pressure at 400° F. produces the same yield
as 3,200 p.s.i. pressure at 500° F.
When other ?brous matter such as asbestos or the like
Lelardoux , ___________ __ Dec. 7, 1897
Atwood ______________ __ Apr. 1, 1902
Davis et a1. __________ __ Sept. 18, 1906
form the base material, then the limiting temperature
.to which the scrap material may be heated is de?ned
Hare ________________ __ Aug. 28, 1917
‘Henderson ____________ __ May 7, 1918
by the temperature at which the volatile portions of the
1,535,769 '
Gallardo ____________ __ Apr. 28, 1925
pitch will be driven off. This varies as per types and
kinds of saturants but is readily-'ascert-ainable in the lab. 55
Kirschbraun __________ __ Feb. 14, 1928
Great Britain __________ __ Feb. 27, 1897
Although ‘a single embodiment of the invention has
been shown and described, it is with full awareness that
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