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Патент USA US2121951

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vJune 28, 1938'.
K. CLARK
PAPER ARTICLE
'
‘ 2,121,951
Filed April 11, 19:54 '
WMMMWEH
2,121,951
Patented June 28, ‘1938
‘UNITED STATES PATENT- OFFLCE
to American Seal-Kan Corporation of‘ Dela- .
ware, /Wilmington, DeL, a corporation of Del
aware
Application April 11, 1934, Serial No. 720,066 ’
9 Claims.
This invention relates to paper articles and
’ more particularly to those intended to- contact
_ with foods. One example of such an article'isa
milk bottle cap or closure,- and while it should be
5 understood that the invention is not to be re
v stricted in its broadest aspects to closures for
imilk bottles, the invention. will be hereinafter
more particularly described with relation to such
use.
10
'
,
.
.
(01. 215-38)
'
‘
plastic conditionso that they interfelt with each
other in a- manner well known in manufacture '
of multi-ply paper.
_
_
It is,’of course, important that in the manu
facturing processes in making the caps, be so
carried out that the facing of the paper stock
‘which contains the color forms the outside face of the cap,v and in order to insure this and to
1 insure ready handling of the paper in its various .
In many cases it is desirable to-use colors in stages of formation, certain methods of handling. 10
connection-with such articles, as for the ‘purpose the paper have been found highly desirable as‘ '
of producing ornamental e?ects or for distin - will later more fully appear.
For. a more complete understanding of this
guishing between grades or types of milk. For
example, one color may be used in connection invention, reference may be had tothe accom
1.5
' >
with bottles containing cream, another color mayv panying drawing in which
Figure 1 is a diagrammatic side elevation of a
be ,used in connection with bottles containing
vmultiple cylinder ‘paper machinewarranged for
ing buttermilk, and so on, through the various‘ sheeting a paper in accordance with this inven
gr'ades‘and qualities for which suchdesignations tion.
vcertified milk, another color for bottles contain
20 may be desired.
Likewise it may be desired that
Figure. 2 is a fragmentary perspective of a 20
certain colors be used exclusively by certain
dairies, particularly in any given district, in order
multi-ply paper suchas is produced by the mech
as the letters on the bottles.
before forming them into caps.
anism shown in Figure 1 and which forms the
that the pro-ducts of the various dairies may be - basic material from which the caps are made.
Figure 3 is a diagrammatic view illustrating
readily distinguished. Likewise in some localities
25 the use of 'coloredlettering is employed on the the cutting of the paper into blanks from which. 25
‘ bottles themselves and it then may be desirable the caps are made and certain subsequent treat
to employ sealing caps presenting'the same color ments to which these blanks may be subjected
-
‘
'
Figure 4 is a fragmentary perspective showing
In most cases, however, it is undesirable that
the food products themselves should come into ' ’ a blankv asin the condition subsequent to treat-‘- 30
contact‘ with colored paper vmaterial, not only.
ment'by the apparatus of Figure 3.
,Figure 5 is a diagrammatic representation of
because with the use of certain coloring mate-v
rials there might. actually be some chance of a manner of supporting and feeding the several
blanks to the cap-forming dies. '
_
contamination 'of they food product, or some un
' Figure 6 is a perspective partly broken away 35
desired e?ect on the coloring material itself
hi‘ one form of completed'cap'. .
. through'contact with such product, but also be
Referring ?rst to‘ Figure 1, at I, 2 and 3 are
cause the public has been generally educated up
to the point 'where there is a real demand for shown the several vats containing the paper stock
closure members which present an‘ appearance from which'the several plies of the paper are to
40» of extreme purity and cleanliness where the food be made.- As shownthe vat l [contains a stock 40
which is colored by any suitable means, such,
products are brought into contact therewith.
According to this vinvention, therefore, the caps‘
are formed of a paper material which presents
45
exteriorly the desired color but which on the
opposite face presents material entirely free from later. The vats 2 and 3 are shown as containing 45
coloring material. In order to accomplish this uncolored stock which should be of such a nature
purpose the paper used is preferably‘of multi-ply ‘ that‘it contains no substances such as would be
stock, one face portion only being colored, the deleterious to ‘the food product with which ityis
to contact. While threeseparate vats are illus
other face portion being. free from coloring mat
The use of multi-ply paper permits the trated by which a three-ply paper may be made, 50
application of coloring matter to the stock 'of
one or more of the plies before the plies, are
. 55
for example, as a pigment-or a die of the desired
color. -A more detail ‘discussion ofthe desirable
characteristics of such coloring will be given
brought together to form the completed paper,
the several ‘layers of material beingvv brought to
gether while ‘they are in awet and more or less
it should, of course, be understood that any
desired‘number might be used. Further.refer
ence to the desirability of any particular number
r of plies will later appear.
As shown, each ‘one of the vats contains a pick- ‘5
2
2,121,951
up cylinder or cylinder mold such as d, 5 and 6, . employed with alum, the retention of the color
which picks up the stock from its respective vat
and the setting e?ect by the alum is less e?cient.
and applies it to the under face of the usual
blanket l which passes successively over and in
Where pigments are employed the use of a small
contact with the molds 4, 5, and 6, being pressed
thereagainst by suitable couch rolls 8, 9 and ill.
The blanket then passes about a suction roll or
other similar device as at H for the purpose of
more completely removing the water from the
10
stock and from which it passes over suitable sup
porting rolls l2, between the press rolls l3 and M,
the blanket returning around the roll it while
the sheeted paper passes to the drier indicated
conventionally at I?» from which it may be fed
15 01? to any suitable device, for example, a winder
amount of size helps to retain the pigment, but
of course this detracts to some extent, at least,
from the open and porous character of the paper
and the ease with which it may be impregnated
with the wax. With the use of direct dyes the
salt which is used in setting them is easily washed
‘ out and has no bad effect on the paper stock and 10
such dyes do not bleed into the wax as is the case
with many dyes commonly-used in papermaking.
Not only would such bleeding into the wax be dis
advantageous in that the color might spread
through the‘uncolored portions of the ‘paper, but 15
ure 2 and comprises a colored lamination 20 and
it might also contaminate the wax in the treating
tank through which the blanks pass and thus pass
into subsequently treated blanks in those
two uncolored laminations 2i and 22. “Paper for
tions where color is not desired.
shown at It. ,
.The paper thus produced is illustrated in Fig
use as milk bottle caps and which is subjected to
a severe molding action when being died to form
should be of a somewhat open and porous nature
so that‘ it can be' readily impregnated by mate
rials such as water and waterproo?ng or resist
25 ant materials such as wax, which not only facili
tate the molding operation; but also render the
caps when completed substantially waterproof.
It has been found in practice that it is most
advantageous to have substantially only one
30 third of the total paper by weight or thickness
colored. If there is less than this, the uncolored
portion of the paper_wil1 tend to show through
.
In order to make a paper satisfactory for the
molding operations, it is also advantageous to
hold the degree of saturating qualities and the
tensile strengths in directions longitudinally and
crosswise ,of the paper within proper limits, these
limits depending somewhat on the severity of 25
the stresses produced by the molding operations,
which are in turn dependent on the amount of
deformation which the paper must undergo dur
ing such molding.
The paper thus prepared may then be subjected 30
to treatment bothv to condition it for resistance to
moisture and for the molding operation to which
it must be subjected in forming it into the caps.
In Figure 3 is shown diagrammaticallyv an appa
ratus by which the paper is cut into blanks and 35
on the colored side, particularly where the paper
is subjected to substantial forming operations
when being molded, which tends to produce un
desirable surface abrasions or local thinning free impregnated with the desired waterproo?ng
from color. If the amount of colored stock is agents and otherwise conditions for the molding
operation. As shown in this ?gure, the paper is
more than one-half of the total, there is a tend
ency for the color to show through the uncolored led from a suitable supply source, herein shown
as the roll 30, through a punching mechanism in 40
40 side, particularly after waxing, to suclr an extent
that it will give the appearance of being present dicated at 3|, by which blanks 25 of the proper
on that side of the article which is brought into size are severed from the sheet material, the
waste portions of thepaper being then removed
' direct contact with the milk, which also‘is un
as by being wound up into a roll 32 while the
desirable. While the most satisfactory propor
_ tions of thickness of colored and uncolored stock
is generally about 1 to 2, this may vary from, ac
cording to conditions, of, say, about 1 to 3 to 1 to
1, with the thickness of paper most suitable for
molding into milk bottle caps.
As the paper is subjected to moistening, as well
50
as the wax treatment, in order to facilitate the
molding operation, it is, of course, necessary that
the color should be thoroughly set so- as to pre
vent bleeding of coloring matter into them
55 colored portions or plies of the paper. Further
more, as the articles when in use may become
moistened by contactwith the milk, any such
bleeding orr?ow of the color might have a very
deleterious e?ect and even might escape into the
60 milk.
The sealed milk bottles are also subjected
' to other conditions of great severity with relation
to coloring material in the caps, ‘such, for ex
ample, as the icing operations which not only
subject the caps to the action of cold water but
65 also to abrasive actions of the ice. Two classes
of coloring material are the most satisfactory,
these being pigments, and dyes of the type known
as direct dyes. 'Such dyes have a great a?inity
for sulphite pulp such as is most suitable as a
70 basic stock material for bottle caps, and they
may be thoroughly set by the use of a hot salt
solution. Most dyes used in papermaking are
set by alum, but for paper which is to be impreg
mated with waxes or the like, the use of alum is
75 sometimes disadvantageous, and unless a. size is
blanks 25 themselves are passed, as by the con
veyor 33 to the impregnating tank 34.
45
Some
time previous to being incorporated with the
waterproo?ng materials, it is preferable to sub
ject either the blanks or the paper to a moisten
ing action which swells the ?bers ,of the paper 50
and softens it so that it may be more easily
formed between molding dies, and this moisten
ing is done preferably prior to the treatment for
moisture resistance, since it may aid in the im
pregnating operation. Agents which may addvto 55
the strength or hardness of the completed caps or
add other desirable qualities may be added to the
treating water, if desired. ‘The blanks in moist
condition are shown, therefore, as being fed in
between confronting faces of reticulated feeding 60
belts 35 and 36, the recticulations permitting the
water-resistant material, such as a suitable wax
or mixture of waxes in molten condition, to ?nd
ready access to opposite faces of the blanks. By '
causing the treating waxes to be maintained at 65
a temperature ‘somewhat above’ the boiling point
of the moisture in the blanks, a portion of this
moisture is vaporized and passed off from the
blanks so that as the blanks pass out from the
Wax tank with'a surface coating of molten wax 70
thereon, subsequent‘chilling'of the blanks and
condensation of the moisture vapor therein, acts
to draw in the wax from the blank surfaces, re
sulting in a more thorough penetration of the
wax into the ‘interstices and perhaps even into 75
UM,
-3
2,121,os1 ‘
the ?bers‘ of the paper. The blanks after re
plished either through controlling the’relative '
that they may become “conditioned” or “tem
pered” and uniformly su?iciently plastic to be
most suitable for the molding operations. For
this purpose they maybe kept in closed con
process, or through combinations of both. For
moval from the tank are permitted to 'cool and ' shrinkages of the two types of stock in the forma
are then deposited in any suitable (receptacles. tion and drying of the paper, or through con
It is then preferable to-permit the moistened and trolling the relative amounts to which these sur
saturated blanks to stand for a time in order ' face portions will be expanded by the saturating
example, this may be done by controlling the rel- '
ative freeness or slowness of the colored and'un
colored stock, as, by controlling the amount of
heating ‘to which the stock is subjected before it 10
When properly conditioned they may be sub- ' is employed in papermaking. Thus, if the un—
jected to the forming action between suitable colored stock is slower’ than the colored stock, the ‘
dies as has been illustrated diagrammatically .in'. uncolored side of the paper tends to take up less
Figure 5. As therein shown theblanks 25 are fed water than the colored side. It expands less and
one at a time from the lower end of a suitable therefore is on the concave side of the paper. 15
1.5 out
containing tube 40 by means of a feed plate, such Another'factor which may be of use is the rate of
as 4|, which may be reciprocated across the open cooling'of the blanks on the two sides after-they
lower end of ‘the tube 40 ‘by any suitable means, leave the saturating tank. With the uncolored
so that they may be delivered one at a time to side up, the colored side being against the face
any‘ .suitable conveying means, as at 42, and of the conveyor, the uncolored side cools the more 20
rapidly and assists in cupping the blanks in the
brought in between the upper and-the lower cap
forming dies .43 and 44 by which they are formed proper direction. This is illustrated in Figure 3
into the ?nished ca'ps, one form of which may where the direction of cupping is changed as the '
be as illustrated in Figure 6 at 45. For example, blanks cool on the conveyor 3|. There is also a
further advantage from maintaining the ‘uncol
25 the cap thus formedmay have a central disk
shaped portion 46 which bridges the neck of the ored stock slower than the colored stock in that
milk bottle, this portion 46 having an upstanding the uncolored side of the paper is less porous and
10 tainers for a few hours. '
'
_ wall 41 at its margin for engagement with the - therefore takes up less of the wax from the sat
_ urating tank and is therefore less transparent, so
inner face‘ of a milk bottle above the usual disk
that the probability of the color ‘from the colored 30
receiving ledge therein, an outwardly turned por
tion 48 covering over the pouring lip of the bottle, - side showing through is reduced.
It is also important, particularly from the
and a skirt. 49 depending therefrom to engage the
outer face of the pouring lip. The entire outer standpoint of color and uniformity of color, that
face of the cap presents the desired color while the completedyblanks be quite accurate in thick
ness as the thickness of the blanksdetermines 35
35 the entire inner face of the cap is of uncolored
stock so that no colored stock is presented where
it may contact with the milk in the bottle. '
the action of the parts ‘of the die thereon which
are relatively spaced by predetermined dimen
'
sions. The amount of moisture-and the amount
of saturating material, as also the amount of the
In connection with the feeding of the cap
blanks from the container 40 so that they may be
delivered as desired to the forming dies, it is
‘ important that the blanks should be so positioned
paper stock, is thus of importance sinceall these
relative to the feed plate 4| that at each recipro
cation it may engage'the lowest blank in the stack
and remove it from the tube 40. There is a tend
ency in making blanks of a suitable thickness for
blank is highly compressed during the forming 45
operations, the color effect is deepened and where
formation into bottle caps for the blanks to “dish”
the compression is produced through a wiping
action of the dies thereon, a glossy deeply colored
through unequal rates of drying at opposite face
portions thereof, or from other causes.
40
factors determine the thickness of the blank when
it reaches the forming dies. If the blank isnot
thick enough the color, of the blank itself will
show up in the completed article. Where the‘
Should
?nish is produced, different from that of the col
ored face of the blank before being molded. By 50'
such a slightly dished blank be presented. with its
convex face downward, this may cause di?iculty
suitable disposition of the excess stock which 1
. in the. feeding action by reason of the feeding
vmust be compressed in the molding operation or
edge of the‘ plate 4| passing in under the
edge of the blank, and it is important, there
fore, that the blanks be presented so‘ that
55 if they are not exactly ?at, their convexed faces
namental variations in shading may be produced.
For example, areas of deeper color 50 separated
by areas of. lighter color in pattern formation as
indicated in Figure 6 may be produced, produc
are positioned upwardly.v - This will’ result in the
outer edge of the blanks where the feed plate en
ing a pleasing ornamental effect.
55'.
'
ters being engaged by the feeding edge of this ' ‘ From the foregoing descriptionof a preferred
' plate so thatthe blanks willbe removed succes , constructionand a method by which it may be
60 sively from the bottomof the stack as desired. It made it should be understood by those skilled in so"
' will be noted, however, that the blanks must be
' presented to=the forming dies‘ right side up so the art that various changes and modi?cations,’
that the colored face shall always appear on the
outside rather than the'inside of the cap, and
it is therefore necessary, to‘insure proper feeding
with such a mechanism, that provision be‘made
might be made without departing from the spirit
or scope'of this invention as de?ned by the ap
.
pended
I
claims.
claim:
I
_
‘
v
.
65
v
.
.
1. YA paper blank for molding into an article,
so that the convex face of the blankshall always I
said
blank vcontaining colored,» and uncolored
bear the same relation to the colored and un
_ » colored faces.
70
There are various ways of insuring
stocks in different portions, the colored stock"
this. ' For example, the characters of the paper
stock in the stock vats of the paper machine may
bteing of a different freeness than the uncolored 70
be socontrolled that the colored stock when
2. A paper blank for molding into an article,‘
sheeted and processed shall‘be more extended in
' the conditioned blank than the stock forming
75 the remainder of the blank. This may be accom
s
ock.
.
‘
'
.
.
said, blank containing colored and uncolored
stocks in different portions, the colored stock
being of a different freeness than the uncolored 75
2,121,951
stock, said blank being impregnated with water
proo?ng material.
8. A molded paper milk bottle cap having a
marginal portion of generally inverted U shape
‘
3. A wax‘ paper blank for molding into an ar
ticle, said blank containing throughout one face
portion colored paper stock and in another face
portion uncolored paper stock,the uncoloredpaper
stock being slower than the colored paper stock.
in cross section and forming a housing for the
bottle pouring lip when the cap is applied to
the bottle, said cap comprising interfelted lami
nations, vthe top lamination comprising colored
paper stock in acontinuous layer, and the bot
4. A water-repellant paper milk bottle‘ cap
tom lamination being free from colored stock,
presenting uncolored relatively slow paper stock
said colored lamination being colored throughout
in contact with the bottle contents, and a colored
and of suf?cient thickness to avoid formation of l U
surface abrasions and local thinning free from
color by the molding operation;
outer face layer of a colored ‘paper stock freer
than said uncolored stock.
7
.
5. An interfelted multi-ply paper blank hav
ing stock of di?erent degrees of freeness in oppo
site surface plies.
9. A molded paper milk bottle cap having a
.marginal portion of generally inverted U shape
6. A Wax paper article made from a laminated
in cross section and forming a housing for the
bottle pouring lip when the cap is applied to
paper blank, the laminations at opposite faces of
the blank being of di?erent degrees of freeness,
nationsythe top lamination comprising colored
the lamination containing the freer stock con
paper stock in a continuous layer, and the bot
taining the, larger proportion of wax and the
vstock being colored.
tom lamination being free from colored stock, 2 0
said colored lamination being colored throughout
7. A molded paper article having a central disk
and a marginal portion of generally inverted U
shape in cross section extending upwardly there
from, said article comprising interfelted lami
and of suf?cient thickness to avoid formation of
surface abrasions and local thinning free from
nations, the top lamination comprising colored
the cap.
the bottle, said cap comprising interfelted lam'i- '
color by the molding operation and comprising
substantially one-third of the total thickness of
paper stock in a continuous layer, and the bot
tom lamination being free from colored stock.
KEMPT’ON CLARK.
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