U.S. patent number 3,679,095 [Application Number 05/042,348] was granted by the patent office on 1972-07-25 for folded sheet material and method and apparatus therefor.
This patent grant is currently assigned to Kimberly-Clark Corporation. Invention is credited to Philip G. Hammond, Walter D. Nissen.
United States Patent |
3,679,095 |
Nissen , et al. |
July 25, 1972 |
FOLDED SHEET MATERIAL AND METHOD AND APPARATUS THEREFOR
Abstract
Tissue webs which may be of substantially indefinite length and
suitable for cutting to a convenient size for packaging are folded
and interfolded. The upper or starter web of the stack is folded in
quarters and so arranged that this upper web is readily grasped by
the fingers of a hand and easily removed from the stack. The next
lower web being interfolded with the upper is partially withdrawn
from the stack so that it is presented for easy removal also.
Several apparatus arrangements and methods for effecting the
folding are described.
Inventors: |
Nissen; Walter D. (Appleton,
WI), Hammond; Philip G. (Neenah, WI) |
Assignee: |
Kimberly-Clark Corporation
(Neenah, WI)
|
Family
ID: |
21921390 |
Appl.
No.: |
05/042,348 |
Filed: |
June 1, 1970 |
Current U.S.
Class: |
221/50; 206/449;
206/494; 270/40 |
Current CPC
Class: |
B65H
45/24 (20130101); A47K 2010/428 (20130101) |
Current International
Class: |
B65H
45/12 (20060101); B65H 45/24 (20060101); B65H
45/22 (20060101); B65h 001/04 () |
Field of
Search: |
;221/47-55 ;270/40
;206/57 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Reeves; Robert B.
Assistant Examiner: Bartuska; Francis J.
Claims
What is claimed is:
1. A sheet material assembly comprising a stack of longitudinally
folded sheet material webs including an uppermost starter web and a
next lower web, said uppermost web having longitudinal quarter
folds all in overlying relation providing a folded web having an
opening toward a side edge of the stack, said next lower web having
a fold lying in the said opening of the uppermost web so that
withdrawal of the uppermost web from the stack also partially
withdraws the said next lower web, said uppermost web being closed
along a longitudinal zone intermediate side edges of the stack to
permit grasping of the folded thickness of the said uppermost
web.
2. A sheet material assembly according to claim 1 in which the
quarter folds of the central portion of the uppermost web lie in
contact, the quarter folds of the opposite edges of the uppermost
web lie in contact and the next lower web is interposed between the
folds of the said central portion and the folds of the opposite
edges.
3. A sheet material assembly according to claim 2 in which the said
next lower web has a pair of folds in contact which folds are the
portion of the next lower web interposed between the folds of the
central portion and the folds of the opposite edges of the
uppermost web.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to interfolded webs and particularly to the
starter web for a stack of interfolded webs; the invention also
relates to apparatus and methods for folding a starter web and
combining it with other webs of the stack.
2. The Invention With Relation To The Prior Art
It is common practice in the facial tissue field to provide
individual tissues interfolded in a stack in such manner that
withdrawal of the upper tissue web will expose a length of the
underlying tissue so that it also may readily be removed from the
stack. Such tissue stacks are usually retained in a box of
convenient size for household consumers and such boxes have a
window through which the tissues are removed. In the case of
interfolded tissue each upper web, upon its withdrawal by the hand
of a user, draws the next succeeding web through the window to
present it for easy removal from the stack.
A primary objective of this invention is to so fold an uppermost
web of a stack that it will permit a user to pull on it strongly
when initiating withdrawals of tissue.
An important object of the invention is to provide a novel folding
board arrangement for achieving the novel fold of the uppermost web
of a stack.
A further object of the invention is to provide a novel method of
interfolding webs.
The practice of the invention is of particular importance in
connection with interfolded tissues and similar webs of relatively
low tensile and tear strength. The principles are applicable to
other materials where interfolding may be desired as in the
packaging of paper toweling, napkins and the like.
Briefly, we have found that starter webs of a stack may be
conveniently folded to provide four thicknesses of the web.
Further, the starter web is folded to permit grasping of the full
folded thickness to provide for withdrawal from a stack without
injury to the starting web and those webs closely adjacent to it.
This arrangement is particularly important in connection with
tightly stacked and boxed webs where considerable resistance to web
withdrawal may be present. The starter web for our purpose is so
folded longitudinally that widthwise quarter folds of the web are
in overlying relation. The starter web also has an opening towards
a side edge of the stack but is closed along a longitudinal zone
intermediate side edges of the stack. The next lower web of the
stack has a fold lying in the opening of the uppermost web so that
it will be partially withdrawn from the stack when the uppermost
web is pulled free. By providing the starter web folded along the
intermediate zone, the four thicknesses of web may be readily
grasped by the fingers of a user.
The four folds are suitably made by first folding the traveling web
into halves longitudinally of the web. This half folded web is then
again folded to provide the quarter folds and is simultaneously
interfolded with the next lower web of the stack. This latter web
is itself conveniently generally folded as described in U.S. Pat.
No. 3,401,927, R. H. Frick, inventor, and assigned to the same
assignee as the present invention.
The folding device of this invention includes two successively
positioned folding boards. A first is for the purpose of half
folding the uppermost web of the stack and the second for
interfolding the first web with a second while completing the fold
of the first web into quarter folds. The second folding board may
be similar to the folding board shown in FIG. 6 of the
above-mentioned Frick patent and may be threaded in substantially
the same manner as the sheet illustrated in that drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be more fully understood by reference to the
following detailed description and accompanying drawings which
follow. The drawings, for sake of clarity, are somewhat exaggerated
in the presentation of folds, fold lines, thicknesses and the like.
In the drawings:
FIG. 1 is a fragmentary view in perspective of a folding mechanism
in accordance with the invention and illustrating the method of
folding and interleaving the two upper webs of a stack;
FIG. 2 is a sectional view taken along line 2--2 of FIG. 1
illustrating the relationship of the two upper webs of a stack;
FIG. 3 is a sectional view taken along line 3--3 of FIG. 1;
FIG. 4 is a fragmentary view illustrating a method of forming the
web which interleaves with the uppermost web of a stack in accord
with the invention;
FIG. 5 is a view taken along line 5--5 of FIG. 4;
FIG. 6 is a view taken along line 6--6 of FIG. 4;
FIG. 7 is a fragmentary view like that of FIG. 1 but without the
webs and with parts broken away illustrating the arrangement of
successive folding boards and associated equipment;
FIG. 8 is a fragmentary view illustrating a method of forming the
uppermost web of a stack;
FIG. 9 is a view taken along line 9--9 of FIG. 8;
FIG. 10 is a view taken along line 10--10 of FIG. 8;
FIG. 11 is a much enlarged view of the folding mechanism and like
that of FIG. 1 but taken from the rear of the folding boards;
FIGS. 12-18 are sectional views illustrating in detail steps in the
folding of the two uppermost webs of a stack and taken on section
lines of FIG. 11, the section lines corresponding in numerals to
the numeral designating the particular figure of the drawing;
FIG. 19 is a view like that of FIG. 1 but illustrating another
method of interfolding the upper two webs of a stack in accordance
with the invention;
FIG. 20 is a sectional view taken along line 20--20 of FIG. 11;
FIG. 21 is a sectional view taken along line 21--21 of FIG. 11;
FIG. 22 is a sectional and fragmentary view of an upper portion of
a completed stack; and
FIG. 23 is a perspective view of tissues as folded and disposed in
a carton for individual removal.
PREFERRED EMBODIMENTS OF THE INVENTION
Referring to the drawings and initially particularly FIGS. 1 to 18
inclusive, the numeral 1 (FIG. 1) designates a web which is to be
folded as the uppermost web of a web stack. The numeral 2
designates a web which is to be interfolded with web 1 and to be
the next lower, that is, the second web of the stack.
For the sake of convenience, the folding of web 1 to the structure
of FIGS. 8, 9 and 10 will first be considered; the folding of web 2
to the structure of FIGS. 4, 5 and 6 will then be considered
separately; and the formation of the interfolded two webs (FIGS. 1
to 3 and FIGS. 11 to 18) will then be described.
The web 1 is directed by suitably positioned guide rolls 3 to a
first folding board 4 (FIGS. 7 and 8). Board 4 has a first surface
5 in the general form of a trapezoid; a support 6 integral with the
board depends rearwardly and is adapted for providing support of
the board. The board further includes (FIG. 7) a downwardly
forwardly directed surface 7 also in the general shape of a
trapezoid. A web guide rod 8 projects forwardly beneath and beyond
surface 7 angularly to the direction of sheet travel as indicated
by the arrow (FIG. 1) and terminates adjacent a forward portion of
a second folding board 17 (FIG. 8). A second guide rod 9 projects
upwardly above the surfaces 5,7.
The board 4 has a first lateral edge 10 which is inwardly directed
forwardly on surface 5 toward surface 7; the board also has a
second fold edge 11 also inwardly directed forwardly toward surface
7 but suitably somewhat less sharply so than edge 10. The surface 7
includes opposed lateral fold edges 12,13 and forward terminal edge
14 which forms a juncture or corner 15 with lateral edge 12. The
numeral 16 (FIGS. 7,8) designates a common juncture of the board
means or of surfaces 5,7 at a narrow zone of the board 4.
The web 1 is directed under a suitable tension around guides 3
(FIG. 1) and across surface 5. The opposed lateral edge portions of
the web are urged downwardly and inwardly of the edges 10,11 of
surface 5 (FIGS. 8, 11 and 12). Guide 9 (FIGS. 8 and 13) serves
further to direct the lateral edge portions of web 1 toward each
other. The angular projecting guide rod 8 (FIGS. 8, 14 and 15)
urges the lateral edges of web 1 further toward each other into
overlying relation as the web proceeds toward folding board 17.
Web 2, which is to be folded with web 1, (FIG. 1) is spaced
partially laterally of and above web 1 as it moves over guide 31 to
the rear face of panel 18 of board 17. Panel 18 (FIG. 4) has an
upstanding upper extension mount 19 which may be used to support
the board in any convenient mount (not shown). This board 17 is
similar to the board shown and described in Frick U.S. Pat. No.
3,401,927 mentioned above but with limited modifications noted
hereinafter. The board is here described sufficiently to indicate
its functions in the embodiments of this application. Reference may
be had to the Frick patent for a more detailed description.
Opposite extension 19 of panel 18 is a lip 20 of the board 17.
Projecting forwardly from lip 20 in a direction angularly disposed
to the direction of web travel indicated by the arrow (FIG. 1) is a
rod 21 providing a folding edge.
The board 17 further includes a panel 22 which projects forwardly
of panel 18 and upwardly obliquely from horizontally disposed panel
23 lying in the direction of web travel. Panel 23 has a slot 24
adapted for receiving a mounting bolt (not shown). A slot 25 in
panel 18 having an edge 27 (FIG. 7) and the edge 26 of panel 23
provide means for effecting folding of the traveling web 2 (FIG.
4). This slot is of somewhat greater dimension than the slot shown
in Frick U.S. Pat. No. 3,401,927 to provide for passage of the
folded material and one side is curvilinear to aid web threading.
The board 17 is suitably of sheet metal and has bend lines 28,29
(FIG. 7) serving respectively to join the panels 18,22 and
22,23.
The web 2 itself as it travels on the board 17, conveniently termed
a right hand board, is folded to the configuration of FIG. 6.
Specifically, the web 2, to achieve this fold (FIG. 6), is passed
over guide 31 downwardly along the rear surface of panel 18 (FIGS.
4, 11 and 14) and its longitudinal center line crosses the
intersection of fold edges 29, 28 and 26. The right hand half (FIG.
4) of the web 2 passes around the fold edge 28 on the rear side of
the board onto the rear face of the panel 22 (FIG. 15) and makes a
turn of 180.degree. on the edge 26 (FIG. 4) so as to form the fold
2c (FIG. 6) on the upper surface of panel 26.
The left hand half (FIG. 4) of web 2 forms the folds 2a and 2b
(FIG. 6). For this purpose the outer left quarter of web 2 is drawn
through slot 25 over edge 27 (FIG. 7) while the inner left quarter
passes under fold edge or lip (FIG. 7) 20. This inner left quarter
is drawn directly through the device in the path indicated by the
arrow (FIG. 4) to form the fold 2b; the rod 21 urges the outer
quarter over the inner quarter fold 2b to form the fold 2a.
The web 2 is threaded as illustrated in the views of FIGS. 11 and
15 with one edge portion passing through slot 25 as shown. The web
1 as it is presented to slot 25 from the surface 7 of board 4 has
been largely folded upon itself and interfolding of the two webs is
initiated as the web portions pass in the slot (FIG. 15). As
illustrated in FIGS. 11 and 15 particularly, a first half of an
unfolded width of web 2 is continuously applied to the traveling
web 1 which is folded in halves by the combined action of board 4
and rod 8. The web 1 is then folded again on itself (FIGS. 15 and
16) into quarters and to interfold web 2. This interfolding is
completed as the webs pass under rod 21 in their movement in the
direction of the arrow (FIG. 1). The completion of interfolding is
carried out as web 2 is drawn down the rear of panel 22 around fold
line 29 (FIG. 16) and around edge 26 (FIGS. 17 and 18). The second
web 2 has a remaining half width which is folded as illustrated in
FIG. 18 beneath folds of the first web and fold portions of
itself.
In the embodiment of the folding device or mechanism shown in FIG.
19 the resultant interfolded webs have the same arrangement as
previously described in connection with FIGS. 1 to 3 inclusive.
However, in this instance the folding edge or rod 9 is eliminated
as is the guide 31. The structures of the folding boards are
similar but the feeding of the webs 41,42 involves laterally
overlapping the webs.
Referring to FIG. 19, the first folding board 44 has a trapezoidal
surface 45, a depending rearward support 46, a forward depending
trapezoidal surface 47 and a guide rod 48. Edges 50,51 laterally
bound the surface 45 and edges 52,53 bound the surface 47
laterally. The numeral 55 designates the lower left hand corner of
surface 47 (FIG. 19) and the line of juncture of surfaces 45,47 is
indicated by the numeral 56.
The second folding board (FIG. 19) is generally indicated by the
numeral 57. It includes downwardly depending panel 58 having upper
extension 59 and lower lip 60 or fold line 60. Lip 60 has guide rod
61 secured thereto and the rod extends toward panel 62, above
horizontally disposed panel 63 and across the line of web travel
indicated by the arrow (FIG. 19). Panel 63 includes aperture 64 for
receiving a retaining bolt or the like for securing the folding
board to a frame (not shown). Opening 65 of panel 68 provides for
web passage to the guide rod 61. The panels 58, 62 and 63 may be
formed, like board 17, from one piece of metal. The bend line 68
indicates the juncture of panels 58 and 62, the juncture of panels
62 and 63 not being shown.
In this instance the folding of web 41 is much like that of the web
1 of FIG. 1 in that the web 41 passed over surface 45 and its left
edge (FIG. 19) is drawn downwardly inwardly over edge 50 of the
board 44. This left edge is then guided by guided rod 48 inwardly
beneath the opposite edge of the web. The second web 42 (FIG. 19)
overlies web 41 in much the same manner that web 2 overlies
partially folded web 1 in FIG. 14. The two webs are then presented
to the second folding board 57 in the same manner as webs 1,2 were
presented in FIGS. 15 through 18.
The interfolded webs, as illustrated in FIGS. 20 and 21, are of the
same configuration as the interfolded webs 1,2. These webs are
intended, as already indicated, as the upper webs of a stack and
such a stack is illustrated in FIG. 22. Therein uppermost web 41 is
indicated to have longitudinal quarter folds in overlying relation
and such that the web 41 has an opening toward a side of the stack.
This uppermost web is also closed along a longitudinal zone
intermediate the opposite side edges of the stack so that the
complete web 41 is readily grasped on the longitudinal center line
rather than separate folds of the web. The web 42 is interfolded
with web 41, as already described, and with other webs 70 having
conventional folds 71,72 and webs 73 having folds 74,75.
The stacked webs are conventionally cut to length and provided in
consumer size cartons in generally known manner. The webs may be
provided in the carton in the rectangular arrangement shown in FIG.
22. Alternatively, the arrangement may be as indicated in
fragmentary view in FIG. 23, and a fragment of a carton designated
at 76 has an oval shaped perforation 37 for the purpose of
providing an opening to the stacked tissues 38. In FIG. 23 only the
upper webs are shown, and the stacked tissues are in a U shape. The
start of the withdrawal is readily accomplished without damage to
the individual webs.
In either method of production the resultant webs in the present
instance have a stack of folded sheet material webs in which the
uppermost web has longitudinal quarter folds, for example, 1a, 1b,
1c, 1d (FIG. 2), in overlying relation. In the stack the
arrangement is such that the uppermost folded web has an opening
between folds 1b and 1c toward the edge of the stack. This
uppermost web 1 is closed intermediate the stack side edges along a
longitudinal zone so that all four folds of the upper web may be
conveniently grasped. The next lower web has a pair of folds 2,2b
which lie in the opening of the folds of the upper web and is
partially withdrawn by withdrawal of the upper fold.
The term "longitudinal" as employed herein and the appended claims
is intended to indicate the direction in which the web extends as
it is folded but is not intended to be limited to a particular
length, that is, cut length or otherwise.
As many apparently widely different embodiments of this invention
may be made without departing from the spirit and scope thereof, it
is to be understood that I do not limit myself to the specific
embodiments thereof except as defined in the appended claims.
* * * * *