U.S. patent number 3,860,004 [Application Number 05/404,037] was granted by the patent office on 1975-01-14 for disposable diaper.
This patent grant is currently assigned to Paper Converting Machine Co.. Invention is credited to Ernst Daniel Nystrand.
United States Patent |
3,860,004 |
Nystrand |
January 14, 1975 |
DISPOSABLE DIAPER
Abstract
A disposable diaper wherein interrupted transverse and angled
convergent lines of compression are applied to a diaper blank with
adhesive adjacent the convergent lines to provide a diaper having a
relatively rounded, unstressed crotch-forming portion and a rounded
leg outfold when applied; yet which is relatively thin in its
folded condition prior to application.
Inventors: |
Nystrand; Ernst Daniel (Green
Bay, WI) |
Assignee: |
Paper Converting Machine Co.
(Green Bay, WI)
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Family
ID: |
26970294 |
Appl.
No.: |
05/404,037 |
Filed: |
October 5, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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297750 |
Oct 16, 1972 |
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373247 |
Jun 25, 1973 |
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Current U.S.
Class: |
604/365;
604/385.21; 604/385.201; 604/389 |
Current CPC
Class: |
A61F
13/49001 (20130101) |
Current International
Class: |
A61F
13/15 (20060101); A61f 013/16 () |
Field of
Search: |
;128/284,287 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Opitz; R.
Attorney, Agent or Firm: Dawson, Tilton, Fallon &
Lungmus
Parent Case Text
This application is a continuation-in-part of my copending
applications Ser. No. 297,750, filed Oct. 16, 1972, and Ser. No.
373,247, filed June 25, 1973, now both abandoned.
Claims
I claim:
1. A generally rectangular disposable diaper comprising an outer
impermeable sheet, a layer of liquid absorbing material and an
inner liquid permeable sheet all united perimetrically,
said diaper having a central transversely extending interrupted
line of compression whereby the diaper is adapted to be folded on
itself to provide a crotch-forming portion in the middle of said
interrupted line of compression,
said line having a segment extending in from each longitudinal edge
with each segment terminating short of the crotch-forming portion
of the diaper,
a pair of inwardly convergent foreshortened lines of compression
associated with each of said segments and disposed at about
45.degree. relative thereto, each of said convergent lines of
compression extending in from each longitudinal edge but
terminating short of the crotch-forming portion of the diaper and
short of the inner end of its associated segment and cooperating
with said associated segment to provide a relatively rounded,
unstressed crotch-forming portion, said diaper prior to
installation on an infant being folded along said interrupted line
and having an outfold along each line segment and an infold in said
crotch-forming portion, and further having an infold along each
convergent line whereby said diaper is relatively thin for
packaging,
and means adhering said inner sheet together adjacent each
longitudinal edge but spaced inwardly therefrom on opposite sides
of each of said convergent lines of compression to provide a
rounded leg outfold in said diaper when applied to the body of an
infant, said leg outfold extending generally along an imaginary
line connecting a pair of adhering means adjacent one longitudinal
edge.
Description
BACKGROUND AND SUMMARY OF INVENTION
Increasingly those in the art of producing disposable diapers have
striven to provide suitably prefolded diapers so that the diaper
conforms readily and fits comfortably on the infant. Exemplary of
this are the diapers seen in U.S. Pat. Nos. 3,196,874 and
3,710,797. The diaper of the instant invention is an improvement on
the diapers in the above-mentioned patents.
The inventive diaper provide interrupted transverse and
foreshortened angled convergent lines of compression so as to
develop a single legfold diaper and with legfold adhesive adjacent
the interrupted angled convergent lines of compression to develop
an unusually advantageous leg outfold. The invention lends itself
to a high-speed, simple, folding technique. Further, when the
diaper is opened and laid on a table, preparatory to positioning
the baby on the diaper, the stress lines between the adhesive spots
on the inner diaper face cause the outer central portions to
naturally drape downwardly for a snug, comfortable fit around the
baby's legs, while the stress lines at the same time create a pouch
in the center of the diaper which has excellent containment
characteristics. Because of the combination of lines of
compression, i.e., lines of incipient folding, a stack of single
legfold diapers has a height two-thirds to three-quarters of a
stack of double legfold diapers, which represents a considerable
saving in carton, case, warehousing and shipping costs.
DETAILED DESCRIPTION
The invention is described in conjunction with an illlustrative
embodiment in the accompanying drawings, in which:
FIG. 1 is a plan view of a diaper blank prior to folding;
FIG. 2 is a plan view of the folded diapers;
FIG. 3 is a side elevational view of the diaper of FIG. 2;
FIG. 4 is a plan view of the unfolded diaper showing the various
stress lines.
In the illustration given, and with reference first to FIG. 1, the
numeral 10 designates a diaper "blank." By this, I refer to the
precursor of the final disposable diaper, but one wherein the
essential, conventional elements are already assembled. For
example, the blank 10 includes an outer impermeable sheet, a layer
of liquid absorbing material, and an inner liquid permeable sheet,
all united perimetrically. Such blanks are provided in a connected
stream (prior to scoring and adhesive application), and are
designated 11 in the left hand portion of FIG. 5. Conventional
apparatus is available for the production of such a multiply diaper
web.
The diaper blank in FIG. 1 is seen to include a plurality of lines
of compression, i.e., lines of incipient folding. First, reference
is made to an interrupted, centrally positioned, transverse line 12
which includes line segments 12a and 12b. The middle portion of the
line 12, i.e., the interrupted portion designated 12c in FIG. 1,
provides a crotch-forming portion of the diaper (see FIG. 4) which
is relatively rounded and unstressed, and which has excellent
containment characteristics. The development of fold lines -- as by
compression, creasing, etc. -- may impair the containment
characteristic and, in extreme cases, result in leakage. In some
instances the transverse line 12 may be continuous, but creased
only lightly, particularly in the central portion.
Associated with each line segment 12a or 12b, as the case may be,
are a pair of inwardly convergent foreshortened lines of
compression and which are disposed at about 45.degree. relative to
the associated line segment. As can be readily appreciated from
FIG. 1, the angled lines associated with the line segment 12a are
designated 13 and 14, while those associated with the line segment
12b are designated 15 and 16. It will be seen that if the lines 13
and 14 were extended, they would converge on the line 12, the same
being true in the case of the lines 15 and 16. The foreshortening
aids in developing the advantageous unstressed crotch-forming
portion.
Adhesive is applied in the spots designated 22, 23, 24, and 25 in
FIG. 1, with each spot 22-25 being adjacent a longitudinal edge,
but spaced inwardly therefrom, and also adjacent to but spaced from
an associated convergent line of compression 13-16, respectively.
Before leaving FIG. 1, reference is made to the tabs 26 and 27
which are provided in conventional fashion to secure the diaper in
place about the infant's waist, and which are conventionally
provided on the diaper web 11 upstream of the scoring and adhesive
applicator rolls.
Referring now to FIG. 4, the diaper is seen in its partially
unfolded condition and designated D'. It is in this configuration
that the diaper is ready to receive the body of an infant. The
foreshortened lines of compression 13-16 cooperate with the
interrupted portion 12c of the line 12 to define the relatively
rounded, unstressed crotch-forming portion -- the absence of
intentional creasing, but the presence of slight rounding being
illustrated in FIG. 4 by means of a series of dot-dash lines in the
central portion which is encircled by a dashed line designated
P.
Still referring to FIG. 4, the points of adhesive (as at 22 and 23)
develope an imaginary line 54 which ultimately becomes a rounded
leg outfold when the diaper is applied to the body of an infant. It
will be appreciated that the term "outfold" is used in contrast to
an "infold" which is developed, for example, along the line 14,
viz., where the confronting, abutting faces of the fold are the
inner liquid permeable sheet. However, up to the time of applying
the diaper to the infant, no outfold exists along the imaginary
line 54, but instead, a relatively flat or thin wing, as at W (see
FIG. 2), exists. Thus, the provision of the various lines of
compression, along with the adhesive spots, not only develops a
thin, advantageously packageable diaper, but one which results in
the provision of a body-conforming leg outfold. The advantageous
thinness or compactness can also be appreciated from FIG. 3 which
represents the diaper D in a partiallly unfolded condition, and
wherein there is an infold at 15 and 16, and an outfold at 12b, and
with the incipient leg outfold 54 also being shown.
The inventive diaper is capable of advantageous stacking in
comparison with the heretofore provided diapers which possessed a
like outfold. When the inventive diapers are stacked in aligned
relation, they occupy only about two-thirds of the height of a
stack of previously provided leg outfold diapers. Even when the
diapers are stacked in offset condition, i.e., with only the waist
portion overlapping, there is still a saving of about one-quarter
of the stack height.
* * * * *