CA1091854A

CA1091854A - Diaper with elastic waist means

Info

Publication number: CA1091854A
Application number: CA238,586A
Authority: CA
Inventors: Charles H. Schaar
Original assignee: Colgate Palmolive Co
Current assignee: Colgate Palmolive Co
Priority date: 1974-10-31
Filing date: 1975-10-29
Publication date: 1980-12-23
Also published as: AU504912B2; SE7510639L; PH12566A; ZA756013B; DK456675A; ES227207Y; GB1526223A; BR7507055A; FR2289131A1; NL181165C; ES227208U; IE41872L; SE432347B; NL181165B; ES227205Y; FR2289131B1; JPS5943104A; ES227207U; IE41872B1; ES227209Y

Abstract

DIAPER WITH ELASTIC WAIST MEANS

ABSTRACT OF THE DISCLOSURE
A disposable diaper comprising, an absorbent pad assembly having front and back waistline portions, and pleat means being laterally expandable in at least one waistline portion. The diaper has elastic means in the one waistline portion laterally constraining the one waistline portion when expanded to provide a snug fit of the diaper around the waist-line of an infant.

Description

~91854 ~ACKGROUND OF THE INVENTION
The present invention relates to absorbent articles,and more particularly to disposable diapers.
During recent years diapers of the disposable type have come into widespread use. Although disposable diapers have attained popularity with parents due to convenience, unfavorable comments have been made about leakage from the diapers durinq use and their fit on the infant. In particular, the ends of the diaper are normally susceptible to leakage due, in part, to a loose fit of the diaper about the in f ant .
Many of the present disposable diapers have tape strips located adjacent one end of the diapers. The diapers are norm-;' ally placed on the infant by laying the infant on the diaper with the strip bearing part of the diaper being located beneath the back w~istline of the infant. After removal of release sheetsfrom the tape strips, attachment portions of the strips are brought around the'infant' 8 legs, and anchored to the front por-tion of the diaper. However, in order to obtain a tight fit of ' the diaper and prevent leakage about the infant's legs, the , ~"1 20 attachment portions of the strips are frequently secured at a ' ' : !location on the front portion of the diaper which is spaced some-~'' what from the front end edge or waistline of the diaper.
Since the permanently anchored portions of the strips '~ are usually located adjacent the back end edge of the diaper, after placement of the diaper the tape strips apply tension to ' the back waistline of the diaper and thus may maintain a rela-tively close fit of the diaper against the back waistline of the .. , infant. In contra~t, the attachment portions of the strips are .
often spaced from the front waistline of ~he diaper, and signifi-; 30 cant tension is not applied by the strips against the diaper ,~ front waistline. The front waistline of the diaper is thus per-~' , , mitted to gap away from the infant, increasing the possibility of urine leakage in this area of the diaper, in spite that the front waistline of the diaper is normally more susceptible to urine leakage than the back waistline, since it is closer to the site of urine deposi~ion on the diaper. Also, infants are generally inclined to spend more time on their stomachs than their backs, causing gravity to drive urine in the diaper with greater frequency toward the front waistline~ Thus, the diaper ends are normally susceptible to leakage where it should most :,, , be prevented.

According to the present invention there is provided -~
,:, .s-~ a disposable diaper, comprising: an absorbent pad assembly having an absorbent pad, a pair of side edges, front and back ~ waistline portions, a plurality of longitudinally extending folds "~ defining a box-pleat configuration of the pad assembly having a pair of first panels extending from and overlying the front sur-face of a central panel and outermost panels extending from and overlying the first panels, and means for resisting lateral un-..~
folding of the pad assembly comprising, elastic band means in at least one of said waistline portions, said band means extending between and connected to the outermost panels in said one waist-line portion, said band means being substantially unstretched when the pad assembly is folded and stretching so as to lateral-ly constrain said one waistline portion against expansion during placement of the diaper to provide a snug fit of the diaper about the waistline of the infantO
The constrained waistline portion provides a snug fit of the diaper around the waistline of the infant and reduces .~
,! leakage.~ The constrained waistline portion also provides a comfortable fit of the diaper on the infant~

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In the accompanying drawings which illustrate exemplary embodiments of the present invention:
Figure 1 is a front plan view of a flat disposable diaper;
'~ Pigure 2 is a fragmentary sectional view taken substan-.~i , tially as indicated along the line 2-2 of Figure l;
Pigure 3 is a fragmentary perspective view of the diaper of Pigure 1 after having been folded into a box-pleat configuration, and illustrating elastic means in a waistline portion of the diaper according to the present invention; ~.
Figure 4 is a fragmentary perspective view illustrating the formation of a diaper of the present invention; .
~: Pigure 5 is a fragmentary front plan view of an embodi-... . .
-~ ment of a diaper of the present invention;
:i: Pigures 6-8 are fragmentary plan views illustrating .... .
configurations of the diaper of Pigure 5 as the diaper is unfold-ed for placement. ~ an infant;
Pigure 9 is a fragmentary front plan view of another r~ embodiment of the diaper of the present invention;
.:, ~, '`. 20 Pigure 10 is a fragmentary front plan view of another ,~ ~

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embodiment of the diaper of the present invention;
Fig. 11 is a fragmentary perspective view of a parti-ally folded diaper in another embodiment of the diaper of the present invention;
S Fig. 1~ is a fragmentary perspective view of a parti-,, ally folded diaper in another embodiment of the diaper of the present invention;
Fig. 13 is a fragmentary perspective view of a parti-- ally folded diaper in another embodiment of the diaper of the present invention;
Fig. 14 is a fragmentary perspective view of a parti-, ally folded diaper in another embodiment of the diaper of the ~, present invention.
~, Fig. 15 is a ragmentary perspective view of another ~ 15 embodiment of the diaper of the present invention;
,~ Fig. 16 is a fragmentary perspective view, taken from ~ the front, of the diaper of Fig. 15 as unfolded preparatory to .... . .
plaaement on an infant;
, Fig. 17 is a fragmentary back plan view of another -1 20 embodiment of the diaper of the present invention;
", , -,- Fig. 18 is a fragmentary front plan view of the diaper , ~ of Fig. 17;
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Fig. 19 is a fragmentary back plan view of another ~r~l~ embodiment of the diaper of the present invention;
~,! 25 Fig. 20 is a fragmentary back plan view of the diaper of Fig. 19 as unfolded preparatory to placement on an infant;
, Fig. 21 is a fragmentary perspective view of a parti-ally folded diaper in another embodiment of the diaper of the present invention;
Fig. 22 is a fragmentary perspective view of a parti-: .

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: ally folded diaper in another embodiment of the diaper of the present invention7 ::
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to Figures 1 and 2, there is shown a flat diapsr designated generally 26 having an absorbent pad assembly 270 The pad assembly 27 has a fluid impervious backing sheet 28 defining a back surface 30 of the pad assembly, a fluid ~
pervious cover or top sheet 32 defining a substantial portion of . ~:
a front surface 34 of the pad assembly, an absorbent pad 36 positioned intermediate the backing sheet 28 and cover sheet 32, r front and back waistline portions 33a and 33b,-and a crotch .
:~ portion 35 intermediate the waistline portions 33a and bo The diaper or pad assembly has a pair of side edges 38a and 38b, and a pair of end edges 40a and 40b connecting the side edges 38a and b, The dia-,,~ .. - .
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per 26 may also have a pair of conventional tape fasteners 42 adjacent one end edge 4~b of the diaper for securing the diaper about an infant during placement, with securing portions 43 of the fasteners 42 extending past the side edges 38a and b of the pad ascembly. As best shown in Fig. 2, the top and backing sheets 32 and 28, respectively, may extend to the end edges of the diaper.
The flat diaper 26 of Fig. 1 has a plurality of longi-tudinally extending folds about fold lines 44a, 44b, 44c, and 44d, defining a box-pleat configuration of the diaper, as shown in Fig. 3. As illustrated in Figs. 1 and 3, the box-pleat diaper 26 has a longitudinally extending central panel C, a pair of first ,, panels B and D extending from and overlying the central panel C, and a pair of outermost panels A and E extending from and overly-ing the first panels B and D. The pleat means 46 of the box-pleat diaper may be spaced apart in a lateral central portion of the diaper, as shown in Fig. 3, for a purpose which will be des-cribed below. As is apparent, the outermost panels A and E may -be moved laterally in the waistline portions 33a and b of the pad assembly to laterally expand the pleat means.
-As is illustrated in Figs. 2-4, the box-pleat diaper 26 has an end section or flap 48 adjacent the end edge 40a, which may be folded about a lateral fold line 50 over the front surface 34 of the diaper, such that the front surface 34 of the end sec-tion or flap means 48 engages against the front surface 34 of the .
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diaper adjacent the end section 48. Preferably, the end edge 52 of the absorbent pad 36 most adjacent the end edge 40a of the diaper is spaced from the end edge 40a, and the fojld line 50 of the end section 48 is located adjacent the end edge 52 of the absorbent pad 36, in order that the backing sheet 28 in the end section 48 overlies an end portion of the absorbent pad when the end section is folded into place on top of the diaper.
~ As illustrated in Fig. 3, the diaper 26 has laterally - extending elastic band means 53 in the form of an elastic loop 55.
The elastic loop 55 extends across the front surface 34 of the outermost panels A and E adjacent the fold line 50. The diaper : al80 has securing means 54, such as adhesive, to retain a portion , ;~ of the front surface 34 of the end section 48 against the underly-ing front surface 34 of the box-pleat diaper. Although for con-venience the securing means 54 is described in connection with the use of adhesive, it will be understood that other suitable securing means may be utilized to retain the front surface of the end section to the underlying front surface of the diaper, such as by heat sealing.
In this embodiment, the securing means 54 comprises a spot of adhesive 56 intermediate the spaced pleat means 46 on the front surface 34 of the central panel C adjacent the fold line 50, and a pair of adhesive lines or spots 58 on the front surface of the outermost panels A and E adjacent the fold line 50. The adhe-.:
sive spot 56 retains the front surface 34 of the central panel C
in the end section 48 against the underlying front surface 34 of the central panel C of the diaper. Similarly, the adhesive lines .::
58 retain the front surface 34 of the outermost panels A and E
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in the end section 48 against the front surface 34 of the under-lying portions of the outermost panels in the diaper.

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As shown, the elastic loop 55 passes around the adhe-sive lines or spots 58, and courses of the loop 55 are located intermediate the adhesive spot 56 and the fold line 50. After the end section 48 has been folded over the top of the diaper, as shown in Fig. 4, the end section 48 may be pressed against the underlying portion of the diaper to obtain a good set of the adhesive and retain the end section 48 in place. Thus, as shown in Fig. 5, when the end section 48 is attached to the underlying front surface of the diaper, the elastic loop 55 is captured beneath the end section 48 by the adhesive lines 58. Although, for convenience, the elastic means 53 and end section 48 are des-cribed in connection with the front waistline portion 33a, it is ,~
apparent that a similar structure may be included in the back waistline portion 33b, or both waistline portions, if desired, in this and many of the other embodiments of the present invention.
The use of the elastic band means 53 in conjunction with the folded over end section 48 to provide a snug fit of the dia-per and minimize leakage is described in connection with Figs. 6-8. As the end of the box-pleat diaper 26 adjacent the end sec-tion 48 is unfolded during placement of the diaper on an infant,the spots of adhesive 56 and 58 or securing means 54 maintain :
~ ~ front surface portions of the end section 48 against the underly-, .
~ ing front surface 34 of the diaper, and retain the elastic loop "~: .
55 in place beneath the end section 48. Thus, as shown in Figs.
6 and 7, as the outermost panels A and E of the diaper are spread . .
outwardly, the outermos~ panels of the end section 48 are unfolded from under the central panel C of the end section, and the cap-. .
I tured elastic loop 55 is expanded by the adhesive lines 58. When ~ , , the end of the diaper is completely unfolded, as shown in Fig. 8, ... .
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`, ~_, -`-the securing means 54 retains the entire length of the end sec-tion 48 in an overlying relationship with the portion of the ; diaper adjacent the end section 48. In this configuration, the adhesive spot 56 retains the central panel C of the end section 48 against the underlying portion of the diaper central panel, while the adhesive lines 58 retain the outermost panels of the end section 48 against the underlying outermost panels of the pad assembly or diaper. Additionally, the captured elastic loop 55 is expanded and actuated responsive to lateral expansion of the pleat means, and causes a gathering of the pad assembly in the waistline portion 33a. Thus, the elastic loop lateraliy con-strains the waistline portion of the pad assembly, and when the ` diaper is placed on an infant after securement by the tape fasten-erC the waistline portion is brought into close contact by the elastic loop to obtain a snug fit about the waistline of the infant. As shown, the end section 48 substantially covers the elastic band means 53 to prevent contact of the band means against the skin of the infant.
Accordingly, when the box-pleat diaper is completely unfolded, the folded over portion of the fluid impervious backing ; , sheet 28 serves to form a waterproof sealing barrier to prevent - leakage at the end of the diaper. Since the folded over backing sheet in the end section preferably overlies an end portion of the absorbent pad, the backing sheet forms a waterproof pocket : .
to capture urine which may wick from the end édge of the absorb-ent pad, and thus prevents leakage. It is noted that the secur-ing means 54 of the unfolded diaper of Fig. 8 retains only spaced areas of the end section against the diaper. Thus, the regions of the backing sheet in the end section 48 intermediate the .

~091854 adhesive spots 56 and 58 are permitted to gap away from the under-lying front surface of the diaper. The elastic band means 53 brings the waistline portion of the diaper into close contact with 1:he infant's skin, and t~.ese free regions of the end section serve to form a gasket against the infant's skin and aid in preventing leakage of urine from the diaper. Additionally, the elastic means assists in retaining the diaper about the infant, and permits the use of tape fasteners of reduced strength, thus reducing the cost of the fasteners and diaper to the consumer.
Another embodiment of the diaper of the present inven-tion is illustrated in Fig. 9, in which like reference numerals designate like parts. In this embodiment, the courses of the elastic loop 55 pass on opposite sides of the adhesive spot 56.
In other respects the diaper of Fig. 9 is similar to the diaper described in connection with Figs. 1-8, and operates`similarly to ~btain a close fit of the waistline portion about the infant.
Another embodiment of the present invention is illus-; trated in Fig. lO, in which like reference numerals designate like parts. In this embodiment, which is similar in most respects to - 20 the diapers previously described, the adhesive spot 56 is omit;ted from the pad assembly, and the adhesive lines or spots 58 of the securing means 54 retain the elastic loop 55 beneath the end section 48, as previously described, and retain the end section 48 in its overlying relationship when the diaper is expanded.
Another embodiment of the diaper of the present inven-tion is illustrated in Fig. ll, in which like reference numerals , . ~
designate like parts. In this embodiment, the elastic means 53 comprises an elastic strip 57 which is secured to the front sur-face 34 of the outermost panels A and E. The strip 57 may com-prise a pressure-sensitive tape having an elastic backing and adhesi~e adjacent its ends secured to the outermost panels. The end section 48 may be retained in place over the strip 57 by ~.~
_~_ ~091854 securing means 54. The elastic strip 57 operates similar to the elastic loop 53 to obtain a close fit of the waistline portion of the diaper, as previously described.
Another embodiment of the diaper of the present inven-tion is illustrated in Fig. 12, in which like reference numerals designate like parts. In this embodiment, the elastic strip 57 has end portions 59 which are secured to adhesive on the securing portions 43 of the tape fasteners 42, in order to retain the elas-tic strip 57 in place over the front surface 34 of the outermost panels A and E. The end section 48 may be retained in place by securing means 54. When the outermost panels are moved laterally to expand the pleat means 46 during placement of the diaper, the adhesive on the tape fasteners retains the end portions 59 of the elastic,strip 57, such that the strip 57-is'expanded.
~'~ 15 Another embodiment of the diaper of the present inven-tion is illustrated in Fig. 13 in which like reference numerals designate like parts. In this embodiment, the elastic loop 55 extends around ,the securing portions 43 of the'tape fasteners 42, and the tape fasteners retain the elastic loop in its proper posi-tion when the pleat means in the diaper is expanded for placement of the diaper on the infant. The end section 48 may be retained in place by securing means 54, as previously described.
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Another embodiment of the diaper of the present inven-tion is illustrated in Fig. 14, in which like reference numerals ~' 25 designate like parts. In this embodiment, the elastic band means ,j ~, 53 comprises a strip ,of elastic foam 61 having ends secured to :i ~ the front surface 34 of the outermost panels A and E by securing ... .
means 54 which may also retain the end section 48 in place on the ' diaper.
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lO9i8S4 Another embodiment of the diaper of the present inven-tion is illustrated in Figs. 15 and 16, in which like reference numerals designate like parts. In this embodiment, the elastic foam strip 61 has end portions 63 retained by the adhesive on the securing portions 43 of the tape fasteners 42, and the strip 61 passes over the back surface 30 of the end section 48. When the waistline portion of the pad assembly is laterally expanded, as shown in Fig. 16, the foam strip 61 covers a substantial por-tion of the folded over end section 48, and provides a particu-larly soft surface over the end section for the infant's skin.
Another embodiment of the diaper of the present inven-- tion is illustrated in Figs. 17 and 18, in which like reference numerals designate like parts. In this embodiment, the elastic loop 55 extends around the securing portions 43 of the tape fas-teners 42 and passes around the back surface 30 of the central . ~. .
panel C in the pad assembly. An intermediate portion of the elastic loop 55 may be secured to the back surface 30 of the central panel C by suitable means, such as a tape strip 65. The elastic loop 55 in the diaper of Figs. 17 a~d 18 operates to laterally constrain the waistline portion of the diaper, as pre-~ viously described, when the pleat means in the diaper is later-; ally expanded during placement of the diaper on the infant, with , ., j the securing portions 43 of the fasteners 42 retaining the loop .~
in position in conjunction with the tape strip 65.

3 25 A somewhat similar embodiment of the diaper of the pres-ent invention is illustrated in Figs. 19 and 20, in which like reference numerals designate like parts. In this embodiment, ` the elastic loop 55 also extends around the securing portions 43 of the tape fasteners 42 and the back surface 30 of thé central _~_ ~`

109:~854 panel C in the pad assembly. However, in this embodiment, the back surface of the central panel in an end section 48' is folded against the bac~ surface 30 of the central panel C, as shown, and ~ecuring means 54', such as a~ adhesive spot 56', retains the ce~tral panel of the end section 48' against the back surface of the central panel C. The courses of the elastic loop 55 pass between the adhesive spo~ 56' and a fold line 50' defining the folded over end section 48'. When the pleat means in the diaper is laterally expanded, as shown in Fig. 20, the entire end sec-tion 48', including the first panels B and D and outermost panels A and E, as well as the central panel C, is folded over the back surface 30 of the diaper and covers a substantial portion of the elastic loop 55. The elastic loop 55 operates to laterally con-strain the laterally expanded diaper and provide a good fit of the diaper around the waistline of an infant, as previously des-cribed.
- Another embodiment of the diaper of the present inven-tion is illustrated in Fig. 21, in which like reference numerals designate like parts. In this embodiment, the elastic loop 55 ; .
extends completely around the outer surface of the pleated diaper, and operates as previously described to laterally constrain the diaper when it is unfolded. The loop 55 may be retained in place by the end section 48 which is secured to the underlying front surface of the diaper by the securing means 54. Alternatively, j~j 25 or in combination with the end section 48, the tape fasteners 42 - may be utilized to prevent slippage of the loop 55 toward the ~ crotch region of the diaper, thus retaining the loop at its ;~i desired location.
Another embodiment of the diaper of the present inven-tion is illustrated in Fig. 22, in which like reference numerals : .

,~_ :, ~091854 designate like partsO In this embodiment, the elastic loop 55 extends around the outer surface of the pleated diaper, with the loop passing around the side edge 38a intermediate one tape fas-tener 42a and the end edge 40b, and passing around the other side edge 38b adjacent a side of the other tape fastener 42b remote the end edge 40bo It is apparent that the fasteners 42a and b alone will retain the loop 55 in place when the diaper is laterally unfolded, but the end section 48 may be folded over . and secured to the underlying front surface of the diaper by ~ 10 securing means 54 in order to cover the loop, if desired.
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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A disposable diaper, comprising: an absorbent pad assembly having an absorbent pad, a pair of side edges, front and back waistline portions, a plurality of longitudinally extending folds defining a box-pleat configuration of the pad assembly having a pair of first panels extending from and overlying the front surface of a central panel and outermost panels extending from and overlying the first panels, and means for resisting lateral unfolding of the pad assembly comprising, elastic band means in at least one of said waistline portions, said band means extending between and connected to the outermost panels in said one waistline portion, said band means being substantially unstretched when the pad assembly is folded and stretching so as to laterally constrain said one waistline portion against expansion during placement of the diaper to provide a snug fit of the diaper about the waistline of the infant.

2. The diaper of claim 1 wherein the pad assembly includes flap means at least substantially covering said elastic means.

3. The diaper of claim 1 wherein the pad assembly includes fluid im-pervious flap means covering a substantial portion of the elastic means when the one waistline portion is expanded.

4. The diaper of claim 1, 2 or 3 wherein the elastic band means com-prises an elastic band selected from the group consisting of elastic bands, elastic strips, pressure-sensitive tapes having an elastic backing and elastic foams.

5. The diaper of claim 1, 2 or 3 wherein the plastic band means ex-tends across the front surface of the pad assembly.

6. The diaper of claim 1, 2 or 3 wherein said band means extends across the back surface of the pad assembly.

7. The diaper of claim 1 including a pair of pressure-sensitive tape strips in said one waistline portion adjacent said side edges, and in which the elastic means comprises laterally extending elastic band means retained by said tape strips.

8. The diaper of claim 7 wherein said band means extends around the back surface of the pad assembly, and the band means comprises an elastic loop passing around said tape strips.

9. The diaper of claim 7 wherein said band means extends around the back surface of the pad assembly, and including means for securing the band means to the back surface of the central panel.

10. The diaper of claim 7 wherein said band means extends around the back surface of the pad assembly, the pad assembly includes an end section of the central panel adjacent the end edge in said one waistline portion, said end section being folded against a back surface of the central panel, and including means for securing the end section to the back surface of the central panel with the end section covering at least a portion of the band means when the pleat means is expanded.

11. The diaper of claim 7 wherein the band means extends across the front surface of the outermost panels, and the band means is attached to ad-hesive on the tape strips.

12. The diaper of claim 7 wherein the band means extends across the front surface of the outermost panels, and the band means comprises an elas-tic loop extending around the tape strips.

13. The diaper of claim 7 wherein the elastic means comprises an elas-tic loop extending around the outer surface of the pad assembly, said loop passing adjacent sides of said strips.

14. The diaper of claim 1 wherein the pad assembly includes a pleated end section adjacent the end edge in said one waistline portion, said pleated end section being folded against the front surface of the pad assembly, and including retaining means for retaining a portion of the end section against the underlying front surface of the pad assembly.

15. The diaper of claim 14 wherein the elastic means comprises a strip of elastic foam extending around a back surface of said end section.

16. The diaper of claim 14 wherein the end section covers at least a substantial portion of the elastic means, the retaining means retains por-tions of the outermost panels in said end section to the underlying front surface of the outermost panels, and the retaining means retains the elastic means intermediate the end section and the underlying pad assembly.