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Патент USA US2104996

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Patented Jan. II, 1938
' Charles Quincy Ives,
, Ila-s lllignor to
Sherman Paper Products Corporation, N
Mine, a corporation of Massachusetts
No Drawing.’ Application m 11. m7,
semis». 1mm
11 Claims.‘ (CI. 92-70)
This invention relates to the manufacturev of
formable with the need of little, if any, moisture
corrugated paper products such as ‘are useful for
therein as it passes into the nip of the corrugat»
making cartons or boxes, for wrapping fragile
and other‘ware, for lining boxes and freight cars,
ing rolls, wherefore, the corrugated sheet hereof
requires little, if any, drying after the corrugaté
it etc., for which purposes they may be used as
such or faced on either or both sides‘ with flat
or plane paper adhesively secured thereto. In
making a corrugated paper product, it has heretofore beenthe practice tostart with a compara10 tively stiff and rattly paper sheet so as to realize
a ?nished corrugated paper product whose cor-
very quickly at such temperature while Substan
rugations ‘were of sumclent stiffness to resist
‘tially avoiding scorching or other injury to the
breakdown or ?attening out during handling,
storage, and use.
log operation. It is generally preferable to pass 5
the flat starting sheet through corrugating rolls
heated to a temperature of about 300' to 400°
F. in producing the corrugated paper product
hereof. as the desired incipient fusion of the
leather fiber content of the sheet can be e?ected 10
The corrugated paper product hereof may be
In accordance with the present invention, there
is provided a corrugated paper sheet or product
paper products heretofore produced, the corrugated paper sheet hereof is produced from an
85 initially ?at paper sheet wherein no attempt has
necessarily been made to realize high degree of
sti?nessor rattle. as by the introduction of sizing
cellulosic ?bers.
fabricated from starting paper sheets of various 15
compositions, but. in any event, it is desirable
Generally speaking. the Starting Paper Sheet for
the purpose hereof is preferably of a thickness of
about 0.006 to 0.012", as such a sheet may be 25
converted by the invention hereof into a finished
corrugated paper product of the requisite body
orstiffening agents thereinto. The starting paper
and mechanical properties, including tensile
sheet for the corrugated paper product hereof is
?trensth. tear resistance, etc.
30 characterized byasubstantial content of leather
?ber which.‘although essentially a "dead” ingredient in the initially ?at paper sheet in the
35 or less incipiently‘fused by heat during the sheetcormsatins Operation‘ so as to exert a very
Because of the
bindins and Sti?enlng 611801; of the incipiently 30
fused leather ?ber content in the finished cor
Inflated paper product. it is unnecessary to use
furnish to P881129 at 5 Sheet thickness of about 35
0-006 to 0.012" in the finished corrugated paper
marked sti?'ening effect in the finished or corru-. ‘Product the requisite mechanical Properties. The
gated paper product and at the same time to
fact is that even the cheapest or waste cellulosic
may‘; a high degree of resiliency to the com.
materials, including such waste papers as giassine,
the initially
55 flat
herein advantage
is that it isof readily
papers sometimes termed “?oor sweepings"
9, 104,996
sively secured to the crests of the corrugations, as
and about 275 parts of previously shredded or dis- _ ordinarily.
integrated tanned scrap sole leather was also add
ed to the beater along with sumcient water to
ensure free circulation of the beater charge ‘or
It is to be understood that the principles of the
present invention extend to the use of paper
sheets made from furnishes containing cellulosic
contents. The heater charge was beaten or dis
integrated for a period of about an hour or more,
with gradual lowering of the beaterroll
at the
?bers of all sorts and treated or processed other
wise than in the speci?c example hereinbefore
given. Thus. the cellulosic fiber component of
end of the beating operation so as to ensure a
the beater furnish may be any one or a mixture of
smooth ?nished stock or papermaking furnish
a wide variety of virgin ?bers, such as kraft,
10 which could be formed into a sheet of the desired,
uniform texture on a Fourdrinier. or equivalent
paper-making machine. In the course of the beat
sulphite, or other chemical wood pulp, mechani
cal wood pulp. newsprint. rags. etc.: and the
leather ?ber component of the furnish may be
ing operation, for instance. at the end stages
had from scrap ieatherboard. waste leather, or
the like, which may be reduced or disintegrated ll
to pulp form in the presence of water in the
thereof, it is preferable to add about‘ 20 to 30
V15 pounds of lime to the beater charge for the pur
pose of facilitating the disintegration or de?beri»v
zation of such residual clumps or pieces of paper,
such as waxed paper. that may resist complete
de?berization. The lime apparently promotes a
20 dispersion of the wax content of the residual
' ‘beater
engine prior to the admixture therewithof
‘ the cellulosic ?ber component. In some instances. '
it may be desirableto replace some or most of the
waxed paper pieces and simultaneously, to cause
individualization or separation of the ?bers con
stituting such pieces. Again. the lime. evidently
by reason of reaction with the leather ?bers
and/or their content of tanning agent.‘ generates
cellulosic ?ber component of the papermaking
furnish with such speci?c ?bers as asbestos and/oi‘
wool in order to impart special or speci?cally de
sired properties in the ?nished corrugated sheet
hereof. It ispreferable to use lime as'the pro
moter of disintegration of refractory papers such
as waste waxed paper and as the chemical for
generating the tan color throughout the stock by
reaction with the de?berized tanned leather scrap
and/or its content of tanning agent. In this lat
ter connection. it might be noted that while such 3°
stronger alkalies as caustic soda might be used in
a substantially uniform browncoloration through
out the beaten stock. which coloration is desir
able in that thepaper sheet made from the stock
has_ a brown or tannish hue reminiscent of kraft
'30 paper and thus attractive to the consumer. Such
brown coloration of the‘ stock ensues. irrespective lieu of lime for such latter purpose. they are more
of such varied color waste papers as may consti
expensive than lime and tend tovgelatinize or
tute the raw material of thebeater furnish; and dissolve the leather ?bers and thus to lead ‘to a
such coloration is su?‘lciently potent or dominat-_ paper sheet of unduly high V initial stiffness _ or 8‘
35 ing to offset or mask the varied colors of the brittleness coupled with unduly low tear resistance
v‘j mate papers. which varied colors, if permitted to suchfas give rise to the‘danger ‘of breakage or
persist in the ?nished paper product. would make rupture of the sheet during the corrugating oper
.for a heterogeneously or irregularly colored paper ation.
of poor or unattractive appearance. ,
The lime-treated beaten stock is preferably
jordaned priorto its delivery to the stock chest of
‘the papermaking machine wherein the stock may
be. diluted with water from a beater or Jordan
consistency of, say, about 5% to a papermaking
45 consistency of about %%. The stock is formed
on the papermaking machine into a sheet of a
thickness of preferably about 0.009" and wound
up as delivered from the dry end 0! the paper
making machine into parent rolls for transfer to
the corrugating machine.
The paper sheet may be progressively unwound
from a parent roll and run through a corrugating
machine whose corrugating rolls are internally
heated by steam or other suitable heating medium
55 to a temperature of, say, about 340° to 350° 1''.
As already indicated. it is unnecessary to moisten
the paper sheet preparatory to its beingprogres
sively run through the corrugating rolls main
tained at such temperature, since the sheet very
60 nicely assumes the ?uted peripheral con?guration
of the corrugating rolls without any tendency
whatever to be embrittled. crushed. or torn in'the
?utes or teeth of the rolls. The corrugated sheet
progressively issuing from the nip of the corru
65 gating rolls is preferably placed under little ten
sion- or restraint immediately after its issuance
from the corrugating nip, but. as it'gradually cools
down to room temperature and its incipiently
fused leather ?ber component and its corruga
70 tions stiffen or set, the slack in the sheet may be
taken up and the sheet may be accumulated under
tension in roll form or, prior to such accumulation.
be faced under tension-on either or both sides
with a plane paper sheet, which may be adhe
I claim:
1. A corrugated paper sheet containing, be
sides cellulose ?ber. leather ?ber set from in
and contributing
marked stiffness and resiliency to the ‘corruga
tions of said sheet.
2. A corrugated-paper sheet of a thickness of
0.006 to 0.012 inch and containing. besides cellu
lose ?ber, leather ?ber set from incipiently fused
condition‘ and contributing marked sti?ness and
resiliency to the corrugations of said sheet.
3. A corrugated paper sheet containing leather
?ber in the amount of about 10% to 50%. based
on the weight of the sheet, set from incipiently
fused condition and contributing marked sti?
ness and resiliency to the corrugations of said
' 4. A corrugated paper sheet of-a thickness of
about 0.006 to’ 0.012 inch and containing leather
?ber in the amount of about 10% to 50%, based
on the weight of the sheet; set from incipiently
[used condition and contributing marked stillness
and resiliency to the corrugations of said sheet.
5. A method whichcomprises forming a paper
sheet from a papermaking furnish containing.
besides cellulose ?ber, leather ?ber in substan
tial amount;.and corrugaiing the resulting pa
per sheet under sufficient heat to cause incipient
fusion of said leather fiber.
6. A method which comprises forming a paper
sheet from a papermaking furnish containing,
besides cellulose ?ber, leather ?ber in substantial
amount; and corrugating the resulting paper
sheet ata temperature of about 300° to 400° F.
,7. A method which comprises forming a paper
sheet from a papermaking furnish containing 75
about 10% to 50% leather ?ber, based on the
weight of the solid ingredients of said furnish;
and corrugating the resulting paper sheet at a
temperature of about 300° to 400° F.
8. A method which comprises forming a paper
sheet of a thickness of about 0.006 to 0.012 inch
from a papermaking furnish containing about
lime into a papermaking furnish containing
tanned leather fiber in the amount of about 10%
to 50% by weight of the solid ingredients of said
furnish, forming a paper sheet from said lime
treated furnish, and corrugating the resulting 5
paper sheet under sumcient heat to cause in
cipient fusion of said leather ?be .
' resulting paper sheet in substantially dry condi10 tion at a temperature of about 300° to 400° ‘F.
lime into a papermaking furnish containing es
sentially beaten waste paper and de?berized 10
9. A method which comprises incorporating
alkali into a paper making furnish containing a
substantial amount of leather ?ber in admixture
with cellulosic ?ber, forming a paper sheet from
15 said alkali-treated furnish, and corrugating the
scrap sole leather, said leather ?ber constituting
about 10% to 50% by weight of the solid ingre
dients of said furnish, forming said lime-treated
furnish into a paper sheet of a thickness of about
0.006 to 0.012 inch, and corrugating the resulting 15
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