CA1338133C - Method of applying adhesive - Google Patents
Method of applying adhesiveInfo
- Publication number
- CA1338133C CA1338133C CA 569021 CA569021A CA1338133C CA 1338133 C CA1338133 C CA 1338133C CA 569021 CA569021 CA 569021 CA 569021 A CA569021 A CA 569021A CA 1338133 C CA1338133 C CA 1338133C
- Authority
- CA
- Canada
- Prior art keywords
- web
- adhesive
- nozzles
- moving
- location
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0245—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
- B05C5/025—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web only at particular part of the work
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
- A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The method of manufacturing an absorbent pad for utilization as a diaper or an adult incontinent brief, wherein a pair of continuous bands of adhesive are applied to the backing sheet of the pad, prior to assembly thereof.
The nozzles eject adhesive onto a moving web comprising the backing sheet. The nozzles are shifted sideways during their extrusion of adhesive, from a first location to a second location, thus generating a pair of non-linear bands of adhesive on the backing sheet. The nozzles are again shifted from their second location to their original first location upon receipt of proper signals from a control mechanism. The elastic band is not shifted when the nozzles are, thus effectuating securement of the elastic bands only on the portions of the backing sheets where the adhesive was applied at the first location.
The nozzles eject adhesive onto a moving web comprising the backing sheet. The nozzles are shifted sideways during their extrusion of adhesive, from a first location to a second location, thus generating a pair of non-linear bands of adhesive on the backing sheet. The nozzles are again shifted from their second location to their original first location upon receipt of proper signals from a control mechanism. The elastic band is not shifted when the nozzles are, thus effectuating securement of the elastic bands only on the portions of the backing sheets where the adhesive was applied at the first location.
Description
METHOD OF APPLYING ADHESIVE
BACKGROUND OF THE INVENTION
(1) Fleld of the Inventlon Thls lnventlon relates generally to the method of maklng an absorbent pad, and partlcularly on the method of contlnuously applylng adheslve for securing elastlc bands thereto.
PRIOR ART
Elastlc rlbbon should be applled ln a stretched condltion to the leg portlons of absorbent undergarments such as bables dlapers or adult contlnent brlefs. The elastlc rlbbon ls applled ln a stretched condltlon only ln that leg portlon so as to cause gathers thereln. The remalnlng portlon of the elastlc extendlng over the balance of the absorbent pad ls not adhered to the pad, so that portlon of the pad wlll not gather. In the manufacture of dlapers and absorbent pads as well as adult lncontlnent brlefs, an elastlc band ln contlnu-ous form ls placed agalnst an unrolled web or a contlnuous web or backlng materlal. The elastlc band has adheslve applled thereon ln dlscontlnuous portlons therealong, so as to effec-tuate the attachment of the bands to the backlng materlal along the leg portlons thereof. Such an apparatus and method for same ls shown for example, ln U.S. Patent 4,081,301.
Adheslve, as shown ln thls Patent, may be applled ln thln strands on the elastlc or as lndlvldual dots of adheslve on -1- ~
the elastlc. The elastlc band ls then applled to dlaper materlal as the dlaper materlal proceeds along the assembly processes. As the lndlvldual backlng sheets are cut and severed from one another, the stretched elastlcs are also severed. The portlon of the elastlcs that are glued or bound by adheslve to the backlng sheet of the dlaper cause the dlaper ln that portlon to gather. The unattached portlons of the rubber band merely remaln ln the flaccld state ad~acent the absorbent pad. U.S. Patent 4,371,417 shows an apparatus for lnsertlng elastlc strlps onto dlapers for stretchlng and relaxlng predetermlned lengths of the elastlc strlps as they are secured to the dlaper materlal. U.S. Patent 4,297,157 shows a rather compllcated apparatus for placlng elastlc strlps under tenslon, onto garments. An annular array of llnkages and arms are used to apply the elastlc to dlscrete areas ad~acent the leg openlngs of dlapers.
Another Patent showlng the adheslon of elastlc to dlsposable dlapers ls shown ln U.S. Patent 4,585,507. An osclllatlng fork means V-folds longltudlnally spaced portlons of an adheslve equlpped rlbbon agalnst the backlng sheet of a dlaper. The V-shaped longltudlnally spaced portlons do not adhere to thelr respectlve portlons of dlaper and so fall to cause the requlred gatherlng thereof. U.S. Patent 4,578,133 shows a method and apparatus for applylng strlps of elastlc to a web of dlaper materlal. The apparatus ls very compllcated and requlres a dlfflcult method of applylng the strlps to the web of materlal. Two other recent dlsclosures are shown ln U.S. Patent 4,572,043 and 4,574,022 whlch agaln also show 381~3 rather compllcated apparatus for applying discrete lengths of elastlc materlal to a movlng web of backlng sheet. In U.S.
Patent 4,525,229 an elastlc band ls attached to a tape whlch ls attached to the web formlng the backlng sheet of the dla-per. U.S. 4,556,596 shows self adherlng-elastlc strlps applled to a flexlble base materlal. U.S. 4,543,141 shows another arrangement for longltudlnally foldlng portlons of the rlbbon prlor to lts dlsposltlon agalnst a base sheet to lmmoblllze those portlons of the rlbbon. U.S 4,523,969 shows an arrangement for grlpplng elastlc rlbbon at several polnts and stretchlng same prlor to lts appllcatlon agalnst a base sheet comprlslng the bottom portlon of the dlaper. U.S.
Patent 4,507,163 shows a method of feedlng adheslve onto an elastlc before lt ls applled to the base of a dlaper.
Though the collectlon of prlor art ls numerous, and often very compllcated, none of lt appreclates a slmpler method of performlng the same operatlon.
Thus lt ls an ob~ect of the present lnventlon to provlde a method of attachlng the elastlc to a web not shown ln the art.
It ls a further ob~ect of the present lnventlon to provlde a controllable, contlnuous appllcatlon of adheslve to a backlng sheet of a dlaper or an adult brlef.
. 3 -1~38133 BRIEF SUMMARY OF THE INVENTION
The lnvention provides in the method of manufacturing an absorbent pad by applying a plurality of non-linear continuous bands of adheslve to a continuous moving web by an adhesive applying machine, the improvement comprising:
passing the web around a rotatable drum; identifying the amount of web going by the adhesive applylng machlne; e~ectlng adheslve from a nozzle arrangement onto a web movlng therepast; movlng sald nozzle arrangement from a flrst locatlon to a second locatlon durlng motlon of a web therepast and durlng sald e~ectlon of adheslve thereon; returnlng said nozzle arrangement from sald second locatlon to lts first location as a web moves therepast; and continuing said movement of said nozzle arrangement between sald flrst and second locatlons based upon the movement of a web therepast.
The lnventlon also provides ln the method of manufacturing an absorbent pad by applylng a plurallty of non-llnear continuous bands of adhesive to a continuous moving web by an adheslve applying machine, the improvement comprlsing:
running a continuous web of backing material ad~acent a pair of movable adhesive nozzles; measuring the movement of web in relation to the adhesive nozzles; e~ecting adhesive from said nozzles onto said movlng web; movlng the nozzles sldeways from a flrst locatlon a limlted amount to a second locatlon so as to form a palr of non-llnear beads of adheslve onto sald movlng web; and holdlng the nozzles at thelr "away" posltlon for a deslred perlod of tlme.
The elastlc band rlbbon ls of contlnuous length, and ls applled agalnst a contlnuous strlp of adheslve placed upon :,. , the movlng web. The contlnuous strip of adheslve ls applled on a nonllnear manner to the movlng web. The web whlch may comprlse the back sheet of a dlaper or an adult lncontinent brlef, or the llke, ls caused to move about on a rotatable roller or drum. Subsequent to the web movlng on the roller lt ls caused to travel upon a conveyor belt where lt meets an upper layer of fluff materlal and a topmost layer. As the web moves around the roller, a palr of adheslve e~ectlon nozzles apply a contlnuous strlp of adheslve dlrectly to the movlng web. The nozzles are shlfted transversely durlng the appllcation of the strlp of adheslve onto the movlng web so as to effect a generally stepped or "slnusoldal" pattern of adheslve thereon.
The method of the present lnventlon lnvolves feedlng an elastlc rlbbon to an assembly statlon ln a stretched condltlon; supplylng a contlnuous web of materlal such as backlng sheet to an assembly statlon ln a tensloned condltlon;
feedlng an elastlc rlbbon to the assembly statlon ln a stretched condltlon; applylng adheslve ln a contlnuous manner to the web of materlal; movlng transversely the adheslve appllcatlon nozzles whlle sald web ls movlng; returnlng sald adheslve applylng nozzles to thelr orlglnal posltlon whlle sald web ls movlng; and tlmlng the movement of the adheslve applylng nozzles ln con~unctlon wlth the speed of the movlng web so as to properly effectuate a generally stepped repetltlve pattern of adheslve thereon.
- 4a -, -~ 64407-42 Flnally, the elastlc rlbbons are attached to portions of the adheslve bands that ls applled to the backlng sheet as lt goes around the roller.
The apparatus at the assembly statlon for manufactur-lng the absorbent web of materlal comprlses a rotatable roller or drum supported on an axls. The rotatable drum has a flrst ldler roll supported thereabove. A web of backlng materlal of a lndetermlnate length ls dlsposed over the flrst ldler roll and around the drum. The web of materlal ls contlnued over a second idler roll and arranged to be contlnuously transported on a conveyor belt on whlch lt recelves a layer of absorbent fluff materlal and a top sheet. An adheslve applylng mechan-lsm ls dlsposed ad~acent the drum so as to apply a palr of contlnuous strlps or bands of adheslve agalnst the web as lt wraps around the drum.
The adheslve applylng mechanlsm comprlses a lower frame. The lower frame conslsts of a palr of upstandlng legs across whlch ls dlsposed a transverse mountlng plate. The mountlng plate ls generally parallel to the axls of the drum.
A flrst movlng means ls flxedly attached to the generally mld-portlon of the mountlng plate and ls attached to the movable portlon of the flrst movlng means. The movlng means may comprlse a double actlng alr cyllnder. A mlddle plate ls movedly dlsposed above the mountlng plate. A support means ls arranged on each end of the mlddle plate. The support means permlts the mlddle plate to be moved transversely wlth respect to the mountlng plate therebeneath. A llnkage ls arranged between the double actlng alr cyllnder and the mlddle plate so - 1338l33 as to effect sald movement.
A palr of upper plates are movably supported on the mlddle plate. Each upper plate carrles an adheslve nozzle.
Each upper plate ls ad~ustably movable generally longltudlnal-ly, wlth respect to the mlddle plate. Each upper plate has a manual ad~ustment means so as to permlt the settlng of the inltlal locatlon of the upper plate wlth respect to the mlddle plate. Each upper plate has a second movlng means thereon, such as a double actlng pressure cyllnder thereon. The pres-sure cyllnder may be attached to the adheslve nozzle by aconnectlng rod. Each adheslve nozzle is permltted to sllde transversely wlth respect to the upper plate. Each pressure cyllnder on the upper plate ls connected by proper means to a solenold valve means whlch effectuates enactment of transverse movement of the adheslve nozzles wlth respect to the upper plates on whlch they are slldably dlsposed.
The flrst movlng means on the lower mountlng plate ls connected to a pressurlzable source controlled by a solenold valve for actuatlng the alr cyllnder therewlth. The flrst movlng means effectuates movement of the mlddle plate and therefore the movement of the adheslve nozzles radlally toward and away from the drum on whlch the web ls carrled. The adhes-ive nozzles, belng heated, are of necesslty moved away from the web of materlal when the web of materlal has stopped movlng, so as to prevent any burn through thereof. A proper control system effectuates the tlmlng of the second movlng means so as to control the transverse movement of the adheslve nozzles whlle they are deposltlng a strlp of adheslve onto the web or backlng sheet of materlal as it ls moved about the drum. A palr of arms extend down from the transversely lmmov-able mlddle plate. At the dlstal end of each arm there ls dlsposed a pulley. The pulley guldes the elastlc strlp prlor from lts supply roll to lts llnear dlsposltlon on the adheslve strlp and alternatlvely, to the non-adheslve portlon of the web or backlng sheet.
When each of the adheslve nozzles have moved transversely outwardly, they are stlll caused to contlnuously deposlt the strlp or bands of adheslve out of the normal path of the elastlc bands. As the web of materlal ls drlven around the drum, and the elastlc bands are held thereagalnst, that portlon of the elastlc bands whlch are not ln abuttlng contact wlth the adheslve strlp on the web, wlll not stlck to the web.
Therefore the elastlc band ln those noncontactlng, nonadherlng areas wlll not cause the absorbent materlal to "gather"
thereon when the elastlc band has been cut and hence when lt returns to lts stretched state.
The absorbent pad manufactured by the apparatus and method descrlbed hereabove has a palr of adheslve strlps whlch are dlsposed outwardly from thelr llnear paths, on each slde of the leg cut-out portlons. Thus the adheslve strlps or bands form a generally stepped conflguratlon, the adheslve actlng to secure the fluff layer agalnst the bottom layer of the pad, where the adheslve ls not contactlng any elastlc band. The adheslve thereby also acts as a fluld barrler to help mlnlmlze fluld mlgratlon lnto the slde flaps of the pad, dlaper or brlef. The fluld, such as urlne, ls thereby .
133813~ `
directed along the mld-portlon of the pad, helplng to mlnlmlze leakage and uncomfortablllty ln the pad.
BRIEF DESCRIPTION OF THE DRAWINGS
The ob~ects and advantages of the present lnventlon wlll become more apparent, when vlewed ln con~unctlon wlth the followlng drawlngs, ln whlch:
Flgure 1 ls a perspectlve vlew of an assembly statlon of the present lnventlon havlng a palr of osclllatable glue guns shown dlsposed agalnst a backlng sheet;
Flgure 2 ls an elevatlonal vlew of the end of the drum and adheslve appllcatlon apparatus;
Flgure 3 ls a vlew slmllar to Flgure 2, wlth the appllcatlon apparatus moved away from the drum.
Flgure 4 ls a slde elevatlonal vlew of the adheslve appllcatlon apparatus;
Flgure 5 shows a perspective vlew of an absorbent pad lndlcatlng the pattern of adheslve strlp thereon and the elastlc band thereattached;
Flgure 6 shows a perspectlve vlew of the absorbent pad of Flgure 5, ln an unstretched state; and Flgure 7 ls a vlew taken along the llnes VII-VII of Flgure 5.
-- 1338133 q 64407-42 DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in detail, and particularly to Figure 1, there is shown an asæembly station 10, utilizable in the manufacture of absorbent pads such as baby diapers or adult incontinent briefs. This application concerns subject matter that is related to that of copending Canadian patent applications Serial Nos. 569,013 and 569,020.
A rotatable roller or drum 12 is shown in perspective, having a web 14 of indeterminate length, comprising "backing material" movably disposed therearound.
The web 14, moving in a direction as indicated by the arrows thereon, is coming from a source, such as a supply roll, not shown. The web 14 first passes over a first idler roll 16, before it wraps around the drum 12. The web 14 then passes over a second idler roll 18 before it begins its journey on a main conveyor belt system 20, only a portion being shown for clarity.
A feed conveyor belt system 22, is shown on the left, in Figure 1, wherein a layer of absorbent fluff material 24 and a liquid permeable top sheet 26 are juxtaposed in contacting overlying relationship with the web 14 of backing material.
The web 14 of backing material is made of a plastic or like liquid-impermeable material.
A primary adhesive applying mechanism 30, comprising a pair of movable nozzles 32 and 34, are arranged so as to apply a generally stepped array of adhesive portions comprising a non-linear strip of adhesive 36 on the web 14 as it winds around the drum 12. A pair of arrows "A" show the transverse motion available to the movable nozzles 32 and 34. Only the nozzles 32 and 34 of the adhesive applying mechanism 30 are shown for clarity, in Figure 1.
13381~3 A palr of elastic bands 38 ls shown, being gulded over a palr of pulleys 40. The pulleys 40 are rotatlvely held on the lower ends of a palr of arms 41. As the drum 12 ls caused to rotate (clockwlse as shown in the drawlngs), the elastlc bands 38 are caused to be pressed agalnst portlons of the strlp of adheslve 36 already deposlted on the advanclng web 14. The elastlc bands 38 are thus flxedly attached only to those llnear portlons of the web 14, where the adheslve strlps 36 are ln llne with the elastlc bands 38, such as the linear strip of adhesives shown in Figure 1 at 36'. The elastlc bands 38, belng held ln a llnear manner as the drum 12 rotates, comes lnto non-adherlng contact with the web 14 ~backlng sheet), because the strlp of adheslve 36, such as lndlcated by 36" ls not ln contact or allgnment therewlth, by vlrtue of the movable nozzles 32 and 34 havlng been actuated to thelr respectlve sldes (left and rlght).
The adheslve applylng mechanlsm 30 ls shown more clearly ln Flgures 2, 3 and 4. The mechanlsm 30 ls elongated, and as such, ls generally parallel to the axls of rotatlon of the drum 12. The adheslve applylng mechanlsm 30 has a lower frame 50, havlng a palr of upstandlng legs 52, across whlch there ls dlsposed, a transverse mountlng plate 54. The mountlng plate 54 ls shown most clearly ln Flgure 4. A flrst movlng means 56 is secured to the mld-portlon of the mountlng plate 54. The flrst movlng means 56 may comprlse a double-actlng pressurlzable cyllnder 58, havlng a piston rod 60 extendlng therefrom. The plston rod 60 ls attached to a bracket 62 extendlng downwardly from a mlddle plate 64. A
--support means 66, ls arranged on each end of the mlddle plate 64. Each support means 66 comprlses a sllder 68 arranged to move back and forth on a bar 70.
A palr of upper plates 72 and 74 are movably sup-ported above the mlddle plate 64. An end frame 76 extends upwardly from each end of the mlddle plate 64, and a gulde frame 78 extends upwardly from the mlddle of the mlddle plate 64. A palr of sllde shafts 80 are arranged between the end frames 76 and extend through the gulde frame 78. Each upper plate 72 and 74 has a houslng 82 and 84 respectlvely whlch ls supported on and slldes upon the sllde shafts 80. A palr of rotatable threaded shafts 86 and 88 are dlsposed through one end frame 76 on one slde of the mlddle plate 64, as shown ln Flgure 4. Each threaded shaft 86 and 88 has a handle 90, by whlch they may be rotated. A captlve nut 92 ls secured to the bottom of each houslng 82 and 84. Rotatlon of the handles 90, wlll rotate each threaded shaft 86 and 88, each wlth respect to lts captlve nut 92, so as to cause slldlng movement, for transverse manual ad~ustment, of the upper plates 72 and 74 and hence thelr respectlve nozzles 32 and 34, with respect to the mlddle plate 64. Each arm 41 supportlng the pulleys 40 are attached at thelr upper end, to one of the upper plates 72 or 74. Ad~ustment of the nozzles 32 by ad~ustment of the handles 90 wlll concomltantly ad~ust the pulleys 40, and thereby, the locatlon of the elastlc bands 36.
Each nozzle 32 and 34 is also arranged for transverse slidlng movement on thelr respectlve upper plates 72 and 74. A
palr of nozzle support frames 100 extend upwardly from each upper plate 72 and 74.
A nozzle shlftlng means 102 ls arranged on each upper plate 72 and 74 to effectuate the transverse movement of the nozzles 32 and 34 thereon. The shlftlng means 102 ln thls embodlment preferably comprlses a pressurizable double actlng plston and cyllnder unlt 104 secured to the dlstal-most ends of each upper plate 72 and 74. A plston rod 106 extends movably through its outermost respectlve support frame 100.
The plston rod 106, ls attached at lts dlstal-most end, to a nozzle bracket 108. A palr of nozzle support rods 110 are arranged between each palr of nozzle support frames 100. The nozzle brackets 108 each sllde on thelr respectlve nozzle support rods 110.
Each nozzle 32 and 34 has a heatlng element, not shown, arranged therewlthln, so as to malntaln the adheslve supplled thereto, ln a fluld state. Each nozzle 32 and 34 has proper adheslve supply means, under pressure, to permlt a contlnuous e~ectlon of adhesive onto the "backlng" sheet web 14 as lt moves therepast.
Each plston and cyllnder unit 104 ls connected through proper means, not shown, to a regulator 120, such as a solenoid valve arrangement. The regulator 120 provides the means for controllably shlftlng each adheslve nozzle 32 and 34 transversely, so as to effectuate the non-llnear (almost slnusoldal) stepped pattern of adheslve onto the web 14. The regulator 120, whlch provldes the pressure to the proper portlon of the plston and cyllnder unlts 104, ls controlled by a slgnal generator means 122, whlch is arranged on the drum :
12. The slgnal generator means 122 sends signals to a counter, not shown, whlch provldes the lnput to the regulator 120, swltchlng the valvlng thereln to effectuate proper trans-verse movement of the nozzles 32 and 34. The regulator 120 may also effectuate energlzatlon of the flrst movlng means 56 to cause the mlddle plate 64 to move toward or away from the drum 12 and web 14. Thls ls presented ln Flgure 3, whereln ; the nozzle 32 ls shown wlthdrawn from the surface of the web 14. Whenever the web 14 ls not movlng, a slgnal may be sent to the regulator 120 to pressurlze the plston-cyllnder unlts 58 to move the nozzles 32 and 34 away from the web 14, so that they wlll not burn through or melt the plastlc (typlcally) web 14. When the web 14 ls not movlng, the nozzles 32 and 34 are held away from the web 14, so that they wlll not burn through or melt the plastlc (typlcally) web 14. When the web 14 ls actually movlng, the nozzles 32 and 34 are pressed sllghtly agalnst the web 14 for posltlve contact, as shown by the sllght bulge "B" ln the web 14, ln Flgure 2.
A secondary arrangement of adheslve applylng nozzles 130 ls shown ln Flgures 1 and 2. The secondary nozzles 130 dlstrlbute a llnear array of thln strands of adheslve 132 across the entlre web 14 as shown ln Flgures 1 and 7. The thln strands of adheslve 132 are utlllzed to help secure the layer(s) of fluff 24 agalnst the web 14 (backlng sheet), and to secure the perlpheral portlons of the top sheet 26 to the web 14 (backlng sheet).
The assembly of absorbent pads such as dlapers and adult lncontlnent brlefs ls shown ln a somewhat slmpllfled -manner ln Flgure 1. The fluff 24, havlng an "hour glass"
conflguratlon, whlch deflnes the "leg" portlons, ls secured between the "backlng" sheet web 14 and the upper layer 26 as they proceed onto the maln conveyor belt system 20. At thls con~uncture, the elastlc bands 38 are stlll malntained ln a "stretched" condltlon whlle, the adheslve that portlon of lt are placed agalnst, sets. A leg area cuttlng means 140, performs a cuttlng operatlon on the backlng web 14 and the upper sheet 26 so as to create the "hourglass" conflguratlon on all the remalnlng layers of the absorbent pad.
A transverse cuttlng means 142 makes a cut across the contlnuous llne of layers of web 14, fluff 24 and top sheet 26 at proper tlmed lntervals to deflne a "walst" edge 145, and to create lndlvldual absorbent pads 144, such as dlapers or adult lncontlnent brlefs from the oncomlng lndetermlnate length of same proceedlng down the conveyor system 20.
Once the transverse cut has been made, the elastlc bands 38 are no longer under tenslon. That portlon of the elastlc bands 38 whlch was placed over the adheslve 36' whlch was ln allgnment therewlth, and thus contracts to form "gathers" ln the absorbent pad 144, as shown on the rlght hand slde of Flgure 1, and ln Flgure 6. The remainlng elastlc band 38 merely becomes loose and flaccld.
The remalnlng adheslve 36 to whlch no elastlc band ls attached, provldes a strong bond wlth the fluff 24, as shown ln Figure 7. Thls bond wlth the fluff 24 extends ln a gen-erally parallel manner up both sldes of the absorbent pad 144, to the walst edge 145. That extended band of adheslve 36"
becomes a moisture dam to facilitate directional flow of urine away from the sides of the absorbent pad 144 where it might tend to leak.
Thus the continuous non-linear band of adhesive ar-ranged on the backing sheet of the absorbent pad 144 provldes a multlple functlon. It permits the elastlc band 38 to be adhered to the pad where it is necessary, thus providing the "gathers" therein for snug fit around a wearer's legs, while also permitting a liquid damming functlon to occur, so as to dlrect urlne from potential areas whlch are prone to leakage.
- 14a -
BACKGROUND OF THE INVENTION
(1) Fleld of the Inventlon Thls lnventlon relates generally to the method of maklng an absorbent pad, and partlcularly on the method of contlnuously applylng adheslve for securing elastlc bands thereto.
PRIOR ART
Elastlc rlbbon should be applled ln a stretched condltion to the leg portlons of absorbent undergarments such as bables dlapers or adult contlnent brlefs. The elastlc rlbbon ls applled ln a stretched condltlon only ln that leg portlon so as to cause gathers thereln. The remalnlng portlon of the elastlc extendlng over the balance of the absorbent pad ls not adhered to the pad, so that portlon of the pad wlll not gather. In the manufacture of dlapers and absorbent pads as well as adult lncontlnent brlefs, an elastlc band ln contlnu-ous form ls placed agalnst an unrolled web or a contlnuous web or backlng materlal. The elastlc band has adheslve applled thereon ln dlscontlnuous portlons therealong, so as to effec-tuate the attachment of the bands to the backlng materlal along the leg portlons thereof. Such an apparatus and method for same ls shown for example, ln U.S. Patent 4,081,301.
Adheslve, as shown ln thls Patent, may be applled ln thln strands on the elastlc or as lndlvldual dots of adheslve on -1- ~
the elastlc. The elastlc band ls then applled to dlaper materlal as the dlaper materlal proceeds along the assembly processes. As the lndlvldual backlng sheets are cut and severed from one another, the stretched elastlcs are also severed. The portlon of the elastlcs that are glued or bound by adheslve to the backlng sheet of the dlaper cause the dlaper ln that portlon to gather. The unattached portlons of the rubber band merely remaln ln the flaccld state ad~acent the absorbent pad. U.S. Patent 4,371,417 shows an apparatus for lnsertlng elastlc strlps onto dlapers for stretchlng and relaxlng predetermlned lengths of the elastlc strlps as they are secured to the dlaper materlal. U.S. Patent 4,297,157 shows a rather compllcated apparatus for placlng elastlc strlps under tenslon, onto garments. An annular array of llnkages and arms are used to apply the elastlc to dlscrete areas ad~acent the leg openlngs of dlapers.
Another Patent showlng the adheslon of elastlc to dlsposable dlapers ls shown ln U.S. Patent 4,585,507. An osclllatlng fork means V-folds longltudlnally spaced portlons of an adheslve equlpped rlbbon agalnst the backlng sheet of a dlaper. The V-shaped longltudlnally spaced portlons do not adhere to thelr respectlve portlons of dlaper and so fall to cause the requlred gatherlng thereof. U.S. Patent 4,578,133 shows a method and apparatus for applylng strlps of elastlc to a web of dlaper materlal. The apparatus ls very compllcated and requlres a dlfflcult method of applylng the strlps to the web of materlal. Two other recent dlsclosures are shown ln U.S. Patent 4,572,043 and 4,574,022 whlch agaln also show 381~3 rather compllcated apparatus for applying discrete lengths of elastlc materlal to a movlng web of backlng sheet. In U.S.
Patent 4,525,229 an elastlc band ls attached to a tape whlch ls attached to the web formlng the backlng sheet of the dla-per. U.S. 4,556,596 shows self adherlng-elastlc strlps applled to a flexlble base materlal. U.S. 4,543,141 shows another arrangement for longltudlnally foldlng portlons of the rlbbon prlor to lts dlsposltlon agalnst a base sheet to lmmoblllze those portlons of the rlbbon. U.S 4,523,969 shows an arrangement for grlpplng elastlc rlbbon at several polnts and stretchlng same prlor to lts appllcatlon agalnst a base sheet comprlslng the bottom portlon of the dlaper. U.S.
Patent 4,507,163 shows a method of feedlng adheslve onto an elastlc before lt ls applled to the base of a dlaper.
Though the collectlon of prlor art ls numerous, and often very compllcated, none of lt appreclates a slmpler method of performlng the same operatlon.
Thus lt ls an ob~ect of the present lnventlon to provlde a method of attachlng the elastlc to a web not shown ln the art.
It ls a further ob~ect of the present lnventlon to provlde a controllable, contlnuous appllcatlon of adheslve to a backlng sheet of a dlaper or an adult brlef.
. 3 -1~38133 BRIEF SUMMARY OF THE INVENTION
The lnvention provides in the method of manufacturing an absorbent pad by applying a plurality of non-linear continuous bands of adheslve to a continuous moving web by an adhesive applying machine, the improvement comprising:
passing the web around a rotatable drum; identifying the amount of web going by the adhesive applylng machlne; e~ectlng adheslve from a nozzle arrangement onto a web movlng therepast; movlng sald nozzle arrangement from a flrst locatlon to a second locatlon durlng motlon of a web therepast and durlng sald e~ectlon of adheslve thereon; returnlng said nozzle arrangement from sald second locatlon to lts first location as a web moves therepast; and continuing said movement of said nozzle arrangement between sald flrst and second locatlons based upon the movement of a web therepast.
The lnventlon also provides ln the method of manufacturing an absorbent pad by applylng a plurallty of non-llnear continuous bands of adhesive to a continuous moving web by an adheslve applying machine, the improvement comprlsing:
running a continuous web of backing material ad~acent a pair of movable adhesive nozzles; measuring the movement of web in relation to the adhesive nozzles; e~ecting adhesive from said nozzles onto said movlng web; movlng the nozzles sldeways from a flrst locatlon a limlted amount to a second locatlon so as to form a palr of non-llnear beads of adheslve onto sald movlng web; and holdlng the nozzles at thelr "away" posltlon for a deslred perlod of tlme.
The elastlc band rlbbon ls of contlnuous length, and ls applled agalnst a contlnuous strlp of adheslve placed upon :,. , the movlng web. The contlnuous strip of adheslve ls applled on a nonllnear manner to the movlng web. The web whlch may comprlse the back sheet of a dlaper or an adult lncontinent brlef, or the llke, ls caused to move about on a rotatable roller or drum. Subsequent to the web movlng on the roller lt ls caused to travel upon a conveyor belt where lt meets an upper layer of fluff materlal and a topmost layer. As the web moves around the roller, a palr of adheslve e~ectlon nozzles apply a contlnuous strlp of adheslve dlrectly to the movlng web. The nozzles are shlfted transversely durlng the appllcation of the strlp of adheslve onto the movlng web so as to effect a generally stepped or "slnusoldal" pattern of adheslve thereon.
The method of the present lnventlon lnvolves feedlng an elastlc rlbbon to an assembly statlon ln a stretched condltlon; supplylng a contlnuous web of materlal such as backlng sheet to an assembly statlon ln a tensloned condltlon;
feedlng an elastlc rlbbon to the assembly statlon ln a stretched condltlon; applylng adheslve ln a contlnuous manner to the web of materlal; movlng transversely the adheslve appllcatlon nozzles whlle sald web ls movlng; returnlng sald adheslve applylng nozzles to thelr orlglnal posltlon whlle sald web ls movlng; and tlmlng the movement of the adheslve applylng nozzles ln con~unctlon wlth the speed of the movlng web so as to properly effectuate a generally stepped repetltlve pattern of adheslve thereon.
- 4a -, -~ 64407-42 Flnally, the elastlc rlbbons are attached to portions of the adheslve bands that ls applled to the backlng sheet as lt goes around the roller.
The apparatus at the assembly statlon for manufactur-lng the absorbent web of materlal comprlses a rotatable roller or drum supported on an axls. The rotatable drum has a flrst ldler roll supported thereabove. A web of backlng materlal of a lndetermlnate length ls dlsposed over the flrst ldler roll and around the drum. The web of materlal ls contlnued over a second idler roll and arranged to be contlnuously transported on a conveyor belt on whlch lt recelves a layer of absorbent fluff materlal and a top sheet. An adheslve applylng mechan-lsm ls dlsposed ad~acent the drum so as to apply a palr of contlnuous strlps or bands of adheslve agalnst the web as lt wraps around the drum.
The adheslve applylng mechanlsm comprlses a lower frame. The lower frame conslsts of a palr of upstandlng legs across whlch ls dlsposed a transverse mountlng plate. The mountlng plate ls generally parallel to the axls of the drum.
A flrst movlng means ls flxedly attached to the generally mld-portlon of the mountlng plate and ls attached to the movable portlon of the flrst movlng means. The movlng means may comprlse a double actlng alr cyllnder. A mlddle plate ls movedly dlsposed above the mountlng plate. A support means ls arranged on each end of the mlddle plate. The support means permlts the mlddle plate to be moved transversely wlth respect to the mountlng plate therebeneath. A llnkage ls arranged between the double actlng alr cyllnder and the mlddle plate so - 1338l33 as to effect sald movement.
A palr of upper plates are movably supported on the mlddle plate. Each upper plate carrles an adheslve nozzle.
Each upper plate ls ad~ustably movable generally longltudlnal-ly, wlth respect to the mlddle plate. Each upper plate has a manual ad~ustment means so as to permlt the settlng of the inltlal locatlon of the upper plate wlth respect to the mlddle plate. Each upper plate has a second movlng means thereon, such as a double actlng pressure cyllnder thereon. The pres-sure cyllnder may be attached to the adheslve nozzle by aconnectlng rod. Each adheslve nozzle is permltted to sllde transversely wlth respect to the upper plate. Each pressure cyllnder on the upper plate ls connected by proper means to a solenold valve means whlch effectuates enactment of transverse movement of the adheslve nozzles wlth respect to the upper plates on whlch they are slldably dlsposed.
The flrst movlng means on the lower mountlng plate ls connected to a pressurlzable source controlled by a solenold valve for actuatlng the alr cyllnder therewlth. The flrst movlng means effectuates movement of the mlddle plate and therefore the movement of the adheslve nozzles radlally toward and away from the drum on whlch the web ls carrled. The adhes-ive nozzles, belng heated, are of necesslty moved away from the web of materlal when the web of materlal has stopped movlng, so as to prevent any burn through thereof. A proper control system effectuates the tlmlng of the second movlng means so as to control the transverse movement of the adheslve nozzles whlle they are deposltlng a strlp of adheslve onto the web or backlng sheet of materlal as it ls moved about the drum. A palr of arms extend down from the transversely lmmov-able mlddle plate. At the dlstal end of each arm there ls dlsposed a pulley. The pulley guldes the elastlc strlp prlor from lts supply roll to lts llnear dlsposltlon on the adheslve strlp and alternatlvely, to the non-adheslve portlon of the web or backlng sheet.
When each of the adheslve nozzles have moved transversely outwardly, they are stlll caused to contlnuously deposlt the strlp or bands of adheslve out of the normal path of the elastlc bands. As the web of materlal ls drlven around the drum, and the elastlc bands are held thereagalnst, that portlon of the elastlc bands whlch are not ln abuttlng contact wlth the adheslve strlp on the web, wlll not stlck to the web.
Therefore the elastlc band ln those noncontactlng, nonadherlng areas wlll not cause the absorbent materlal to "gather"
thereon when the elastlc band has been cut and hence when lt returns to lts stretched state.
The absorbent pad manufactured by the apparatus and method descrlbed hereabove has a palr of adheslve strlps whlch are dlsposed outwardly from thelr llnear paths, on each slde of the leg cut-out portlons. Thus the adheslve strlps or bands form a generally stepped conflguratlon, the adheslve actlng to secure the fluff layer agalnst the bottom layer of the pad, where the adheslve ls not contactlng any elastlc band. The adheslve thereby also acts as a fluld barrler to help mlnlmlze fluld mlgratlon lnto the slde flaps of the pad, dlaper or brlef. The fluld, such as urlne, ls thereby .
133813~ `
directed along the mld-portlon of the pad, helplng to mlnlmlze leakage and uncomfortablllty ln the pad.
BRIEF DESCRIPTION OF THE DRAWINGS
The ob~ects and advantages of the present lnventlon wlll become more apparent, when vlewed ln con~unctlon wlth the followlng drawlngs, ln whlch:
Flgure 1 ls a perspectlve vlew of an assembly statlon of the present lnventlon havlng a palr of osclllatable glue guns shown dlsposed agalnst a backlng sheet;
Flgure 2 ls an elevatlonal vlew of the end of the drum and adheslve appllcatlon apparatus;
Flgure 3 ls a vlew slmllar to Flgure 2, wlth the appllcatlon apparatus moved away from the drum.
Flgure 4 ls a slde elevatlonal vlew of the adheslve appllcatlon apparatus;
Flgure 5 shows a perspective vlew of an absorbent pad lndlcatlng the pattern of adheslve strlp thereon and the elastlc band thereattached;
Flgure 6 shows a perspectlve vlew of the absorbent pad of Flgure 5, ln an unstretched state; and Flgure 7 ls a vlew taken along the llnes VII-VII of Flgure 5.
-- 1338133 q 64407-42 DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in detail, and particularly to Figure 1, there is shown an asæembly station 10, utilizable in the manufacture of absorbent pads such as baby diapers or adult incontinent briefs. This application concerns subject matter that is related to that of copending Canadian patent applications Serial Nos. 569,013 and 569,020.
A rotatable roller or drum 12 is shown in perspective, having a web 14 of indeterminate length, comprising "backing material" movably disposed therearound.
The web 14, moving in a direction as indicated by the arrows thereon, is coming from a source, such as a supply roll, not shown. The web 14 first passes over a first idler roll 16, before it wraps around the drum 12. The web 14 then passes over a second idler roll 18 before it begins its journey on a main conveyor belt system 20, only a portion being shown for clarity.
A feed conveyor belt system 22, is shown on the left, in Figure 1, wherein a layer of absorbent fluff material 24 and a liquid permeable top sheet 26 are juxtaposed in contacting overlying relationship with the web 14 of backing material.
The web 14 of backing material is made of a plastic or like liquid-impermeable material.
A primary adhesive applying mechanism 30, comprising a pair of movable nozzles 32 and 34, are arranged so as to apply a generally stepped array of adhesive portions comprising a non-linear strip of adhesive 36 on the web 14 as it winds around the drum 12. A pair of arrows "A" show the transverse motion available to the movable nozzles 32 and 34. Only the nozzles 32 and 34 of the adhesive applying mechanism 30 are shown for clarity, in Figure 1.
13381~3 A palr of elastic bands 38 ls shown, being gulded over a palr of pulleys 40. The pulleys 40 are rotatlvely held on the lower ends of a palr of arms 41. As the drum 12 ls caused to rotate (clockwlse as shown in the drawlngs), the elastlc bands 38 are caused to be pressed agalnst portlons of the strlp of adheslve 36 already deposlted on the advanclng web 14. The elastlc bands 38 are thus flxedly attached only to those llnear portlons of the web 14, where the adheslve strlps 36 are ln llne with the elastlc bands 38, such as the linear strip of adhesives shown in Figure 1 at 36'. The elastlc bands 38, belng held ln a llnear manner as the drum 12 rotates, comes lnto non-adherlng contact with the web 14 ~backlng sheet), because the strlp of adheslve 36, such as lndlcated by 36" ls not ln contact or allgnment therewlth, by vlrtue of the movable nozzles 32 and 34 havlng been actuated to thelr respectlve sldes (left and rlght).
The adheslve applylng mechanlsm 30 ls shown more clearly ln Flgures 2, 3 and 4. The mechanlsm 30 ls elongated, and as such, ls generally parallel to the axls of rotatlon of the drum 12. The adheslve applylng mechanlsm 30 has a lower frame 50, havlng a palr of upstandlng legs 52, across whlch there ls dlsposed, a transverse mountlng plate 54. The mountlng plate 54 ls shown most clearly ln Flgure 4. A flrst movlng means 56 is secured to the mld-portlon of the mountlng plate 54. The flrst movlng means 56 may comprlse a double-actlng pressurlzable cyllnder 58, havlng a piston rod 60 extendlng therefrom. The plston rod 60 ls attached to a bracket 62 extendlng downwardly from a mlddle plate 64. A
--support means 66, ls arranged on each end of the mlddle plate 64. Each support means 66 comprlses a sllder 68 arranged to move back and forth on a bar 70.
A palr of upper plates 72 and 74 are movably sup-ported above the mlddle plate 64. An end frame 76 extends upwardly from each end of the mlddle plate 64, and a gulde frame 78 extends upwardly from the mlddle of the mlddle plate 64. A palr of sllde shafts 80 are arranged between the end frames 76 and extend through the gulde frame 78. Each upper plate 72 and 74 has a houslng 82 and 84 respectlvely whlch ls supported on and slldes upon the sllde shafts 80. A palr of rotatable threaded shafts 86 and 88 are dlsposed through one end frame 76 on one slde of the mlddle plate 64, as shown ln Flgure 4. Each threaded shaft 86 and 88 has a handle 90, by whlch they may be rotated. A captlve nut 92 ls secured to the bottom of each houslng 82 and 84. Rotatlon of the handles 90, wlll rotate each threaded shaft 86 and 88, each wlth respect to lts captlve nut 92, so as to cause slldlng movement, for transverse manual ad~ustment, of the upper plates 72 and 74 and hence thelr respectlve nozzles 32 and 34, with respect to the mlddle plate 64. Each arm 41 supportlng the pulleys 40 are attached at thelr upper end, to one of the upper plates 72 or 74. Ad~ustment of the nozzles 32 by ad~ustment of the handles 90 wlll concomltantly ad~ust the pulleys 40, and thereby, the locatlon of the elastlc bands 36.
Each nozzle 32 and 34 is also arranged for transverse slidlng movement on thelr respectlve upper plates 72 and 74. A
palr of nozzle support frames 100 extend upwardly from each upper plate 72 and 74.
A nozzle shlftlng means 102 ls arranged on each upper plate 72 and 74 to effectuate the transverse movement of the nozzles 32 and 34 thereon. The shlftlng means 102 ln thls embodlment preferably comprlses a pressurizable double actlng plston and cyllnder unlt 104 secured to the dlstal-most ends of each upper plate 72 and 74. A plston rod 106 extends movably through its outermost respectlve support frame 100.
The plston rod 106, ls attached at lts dlstal-most end, to a nozzle bracket 108. A palr of nozzle support rods 110 are arranged between each palr of nozzle support frames 100. The nozzle brackets 108 each sllde on thelr respectlve nozzle support rods 110.
Each nozzle 32 and 34 has a heatlng element, not shown, arranged therewlthln, so as to malntaln the adheslve supplled thereto, ln a fluld state. Each nozzle 32 and 34 has proper adheslve supply means, under pressure, to permlt a contlnuous e~ectlon of adhesive onto the "backlng" sheet web 14 as lt moves therepast.
Each plston and cyllnder unit 104 ls connected through proper means, not shown, to a regulator 120, such as a solenoid valve arrangement. The regulator 120 provides the means for controllably shlftlng each adheslve nozzle 32 and 34 transversely, so as to effectuate the non-llnear (almost slnusoldal) stepped pattern of adheslve onto the web 14. The regulator 120, whlch provldes the pressure to the proper portlon of the plston and cyllnder unlts 104, ls controlled by a slgnal generator means 122, whlch is arranged on the drum :
12. The slgnal generator means 122 sends signals to a counter, not shown, whlch provldes the lnput to the regulator 120, swltchlng the valvlng thereln to effectuate proper trans-verse movement of the nozzles 32 and 34. The regulator 120 may also effectuate energlzatlon of the flrst movlng means 56 to cause the mlddle plate 64 to move toward or away from the drum 12 and web 14. Thls ls presented ln Flgure 3, whereln ; the nozzle 32 ls shown wlthdrawn from the surface of the web 14. Whenever the web 14 ls not movlng, a slgnal may be sent to the regulator 120 to pressurlze the plston-cyllnder unlts 58 to move the nozzles 32 and 34 away from the web 14, so that they wlll not burn through or melt the plastlc (typlcally) web 14. When the web 14 ls not movlng, the nozzles 32 and 34 are held away from the web 14, so that they wlll not burn through or melt the plastlc (typlcally) web 14. When the web 14 ls actually movlng, the nozzles 32 and 34 are pressed sllghtly agalnst the web 14 for posltlve contact, as shown by the sllght bulge "B" ln the web 14, ln Flgure 2.
A secondary arrangement of adheslve applylng nozzles 130 ls shown ln Flgures 1 and 2. The secondary nozzles 130 dlstrlbute a llnear array of thln strands of adheslve 132 across the entlre web 14 as shown ln Flgures 1 and 7. The thln strands of adheslve 132 are utlllzed to help secure the layer(s) of fluff 24 agalnst the web 14 (backlng sheet), and to secure the perlpheral portlons of the top sheet 26 to the web 14 (backlng sheet).
The assembly of absorbent pads such as dlapers and adult lncontlnent brlefs ls shown ln a somewhat slmpllfled -manner ln Flgure 1. The fluff 24, havlng an "hour glass"
conflguratlon, whlch deflnes the "leg" portlons, ls secured between the "backlng" sheet web 14 and the upper layer 26 as they proceed onto the maln conveyor belt system 20. At thls con~uncture, the elastlc bands 38 are stlll malntained ln a "stretched" condltlon whlle, the adheslve that portlon of lt are placed agalnst, sets. A leg area cuttlng means 140, performs a cuttlng operatlon on the backlng web 14 and the upper sheet 26 so as to create the "hourglass" conflguratlon on all the remalnlng layers of the absorbent pad.
A transverse cuttlng means 142 makes a cut across the contlnuous llne of layers of web 14, fluff 24 and top sheet 26 at proper tlmed lntervals to deflne a "walst" edge 145, and to create lndlvldual absorbent pads 144, such as dlapers or adult lncontlnent brlefs from the oncomlng lndetermlnate length of same proceedlng down the conveyor system 20.
Once the transverse cut has been made, the elastlc bands 38 are no longer under tenslon. That portlon of the elastlc bands 38 whlch was placed over the adheslve 36' whlch was ln allgnment therewlth, and thus contracts to form "gathers" ln the absorbent pad 144, as shown on the rlght hand slde of Flgure 1, and ln Flgure 6. The remainlng elastlc band 38 merely becomes loose and flaccld.
The remalnlng adheslve 36 to whlch no elastlc band ls attached, provldes a strong bond wlth the fluff 24, as shown ln Figure 7. Thls bond wlth the fluff 24 extends ln a gen-erally parallel manner up both sldes of the absorbent pad 144, to the walst edge 145. That extended band of adheslve 36"
becomes a moisture dam to facilitate directional flow of urine away from the sides of the absorbent pad 144 where it might tend to leak.
Thus the continuous non-linear band of adhesive ar-ranged on the backing sheet of the absorbent pad 144 provldes a multlple functlon. It permits the elastlc band 38 to be adhered to the pad where it is necessary, thus providing the "gathers" therein for snug fit around a wearer's legs, while also permitting a liquid damming functlon to occur, so as to dlrect urlne from potential areas whlch are prone to leakage.
- 14a -
Claims (14)
1. In the method of manufacturing an absorbent pad by applying a plurality of non-linear continuous bands of adhesive to a continuous moving web by an adhesive applying machine, the improvement comprising:
passing the web around a rotatable drum;
identifying the amount of web going by the adhesive applying machine;
ejecting adhesive from a nozzle arrangement onto a web moving therepast;
moving said nozzle arrangement from a first location to a second location during motion of a web therepast and during said ejection of adhesive thereon;
returning said nozzle arrangement from said second location to its first location as a web moves therepast; and continuing said movement of said nozzle arrangement between said first and second locations based upon the movement of a web therepast.
passing the web around a rotatable drum;
identifying the amount of web going by the adhesive applying machine;
ejecting adhesive from a nozzle arrangement onto a web moving therepast;
moving said nozzle arrangement from a first location to a second location during motion of a web therepast and during said ejection of adhesive thereon;
returning said nozzle arrangement from said second location to its first location as a web moves therepast; and continuing said movement of said nozzle arrangement between said first and second locations based upon the movement of a web therepast.
2. The method as recited in claim 1, including the step of:
directing the movement of each nozzle in the nozzle arrangement to move in opposite directions synchronously between said first and second locations.
directing the movement of each nozzle in the nozzle arrangement to move in opposite directions synchronously between said first and second locations.
3. The method as recited in claim 1, including the step of:
applying elastic bands continuously against said web, the bands adhering only to portions of said continuous adhesive bands.
applying elastic bands continuously against said web, the bands adhering only to portions of said continuous adhesive bands.
4. The method as recited in claim 2, including:
moving the adhesive apparatus away from any web when the web stops moving.
moving the adhesive apparatus away from any web when the web stops moving.
5. The method as recited in claim 2, including:
moving the adhesive apparatus towards web on the drum when the web begins movement.
moving the adhesive apparatus towards web on the drum when the web begins movement.
6. In the method of manufacturing an absorbent pad by applying a plurality of non-linear continuous bands of adhesive to a continuous moving web by an adhesive applying machine, the improvement comprising:
running a continuous web of backing material adjacent a pair of movable adhesive nozzles;
measuring the movement of web in relation to the adhesive nozzles;
ejecting adhesive from said nozzles onto said moving web;
moving the nozzles sideways from a first location a limited amount to a second location so as to form a pair of non-linear beads of adhesive onto said moving web; and holding the nozzles at their "away" position for a desired period of time.
running a continuous web of backing material adjacent a pair of movable adhesive nozzles;
measuring the movement of web in relation to the adhesive nozzles;
ejecting adhesive from said nozzles onto said moving web;
moving the nozzles sideways from a first location a limited amount to a second location so as to form a pair of non-linear beads of adhesive onto said moving web; and holding the nozzles at their "away" position for a desired period of time.
7. The method as recited in claim 6, including the step of:
returning the nozzles a limited amount so as to return them to their first location.
returning the nozzles a limited amount so as to return them to their first location.
8. The method as recited in claim 6, including:
running a pair of continuous ribbons of elastic onto said moving web;
attaching said ribbons of elastic onto said moving web where said nozzle has extruded adhesive thereon, in alignment with the nozzles first location.
running a pair of continuous ribbons of elastic onto said moving web;
attaching said ribbons of elastic onto said moving web where said nozzle has extruded adhesive thereon, in alignment with the nozzles first location.
9. The method as recited in claim 7, including:
permitting said ribbon of elastic to be free of attachment to said web where said nozzles have ejected adhesive thereon at their second location.
permitting said ribbon of elastic to be free of attachment to said web where said nozzles have ejected adhesive thereon at their second location.
10. In the method of manufacturing an absorbent pad by applying a plurality of non-linear continuous bands of adhesive to a continuous moving web by an adhesive applying machine, the improvement comprising:
passing the web around a rotatable drum;
identifying the amount of web going by the adhesive applying machine;
ejecting adhesive from a nozzle arrangement onto a web moving therepast;
moving said nozzle arrangement from a first location to a second location during motion of a web therepast and during said ejection of adhesive thereon;
returning said nozzle arrangement from said second location to its first location as a web moves therepast;
continuing movement of said nozzle arrangement between said first and second locations based upon the movement of a web therepast;
directing the movement of each nozzle in the nozzle arrangement to move in opposite directions synchronously between said first and said second locations; and applying elastic bands continuously against said web, the bands adhering only to portions of said continuous adhesive bands.
passing the web around a rotatable drum;
identifying the amount of web going by the adhesive applying machine;
ejecting adhesive from a nozzle arrangement onto a web moving therepast;
moving said nozzle arrangement from a first location to a second location during motion of a web therepast and during said ejection of adhesive thereon;
returning said nozzle arrangement from said second location to its first location as a web moves therepast;
continuing movement of said nozzle arrangement between said first and second locations based upon the movement of a web therepast;
directing the movement of each nozzle in the nozzle arrangement to move in opposite directions synchronously between said first and said second locations; and applying elastic bands continuously against said web, the bands adhering only to portions of said continuous adhesive bands.
11. The method as recited in claim 10, including:
moving the adhesive apparatus away from any web when the web stops moving.
moving the adhesive apparatus away from any web when the web stops moving.
12. The method as recited in claim 10, including:
moving the adhesive apparatus towards web on the drum when the web begins movement.
moving the adhesive apparatus towards web on the drum when the web begins movement.
13. In the method of manufacturing an absorbent pad by applying a plurality of non-linear continuous bands of adhesive to a continuous moving web by an adhesive applying machine, the improvement comprising:
running a continuous web of backing material adjacent a pair of movable adhesive nozzles;
measuring the movement of the web in relation to the adhesive nozzles;
ejecting adhesive from said nozzles onto said moving web;
moving the nozzles sideways from a first location a limited amount to a second location so as to form a pair of non-linear beads of adhesive onto said moving web;
holding the nozzles at their "away" position for a desired period of time;
returning the nozzles a limited amount so as to return them to their first location;
running a pair of continuous ribbons of elastic onto said moving web; and attaching said ribbons of elastic onto said moving web where said nozzle has extruded adhesive thereon, in alignment with the nozzles first location.
running a continuous web of backing material adjacent a pair of movable adhesive nozzles;
measuring the movement of the web in relation to the adhesive nozzles;
ejecting adhesive from said nozzles onto said moving web;
moving the nozzles sideways from a first location a limited amount to a second location so as to form a pair of non-linear beads of adhesive onto said moving web;
holding the nozzles at their "away" position for a desired period of time;
returning the nozzles a limited amount so as to return them to their first location;
running a pair of continuous ribbons of elastic onto said moving web; and attaching said ribbons of elastic onto said moving web where said nozzle has extruded adhesive thereon, in alignment with the nozzles first location.
14. The method as recited in claim 13, including:
permitting said ribbon of elastic to be free of attachment to said web where said nozzles have ejected adhesive thereon at their second location.
permitting said ribbon of elastic to be free of attachment to said web where said nozzles have ejected adhesive thereon at their second location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 569021 CA1338133C (en) | 1988-06-09 | 1988-06-09 | Method of applying adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 569021 CA1338133C (en) | 1988-06-09 | 1988-06-09 | Method of applying adhesive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1338133C true CA1338133C (en) | 1996-03-12 |
Family
ID=4138165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 569021 Expired - Fee Related CA1338133C (en) | 1988-06-09 | 1988-06-09 | Method of applying adhesive |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1338133C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6652504B1 (en) | 2000-08-15 | 2003-11-25 | Kimberly-Clark Worldwide, Inc. | Pant-like absorbent garments having curved leak guard flaps |
| WO2014026348A1 (en) * | 2012-08-16 | 2014-02-20 | 北京倍舒特妇幼用品有限公司 | Method of applying bulk glue for nursing pad base film to four corners of sanitary product nursing pad base film and device therefor |
| CN110525752A (en) * | 2019-07-12 | 2019-12-03 | 天津瑞泰包装机械有限公司 | Combinatorial enumeration device for packed packing machine automatic production line |
-
1988
- 1988-06-09 CA CA 569021 patent/CA1338133C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6652504B1 (en) | 2000-08-15 | 2003-11-25 | Kimberly-Clark Worldwide, Inc. | Pant-like absorbent garments having curved leak guard flaps |
| WO2014026348A1 (en) * | 2012-08-16 | 2014-02-20 | 北京倍舒特妇幼用品有限公司 | Method of applying bulk glue for nursing pad base film to four corners of sanitary product nursing pad base film and device therefor |
| CN110525752A (en) * | 2019-07-12 | 2019-12-03 | 天津瑞泰包装机械有限公司 | Combinatorial enumeration device for packed packing machine automatic production line |
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