SE510621C2 - Bonding fibrous, absorbent and plastic film layers together to form hygiene products - Google Patents
Bonding fibrous, absorbent and plastic film layers together to form hygiene productsInfo
- Publication number
- SE510621C2 SE510621C2 SE9600096A SE9600096A SE510621C2 SE 510621 C2 SE510621 C2 SE 510621C2 SE 9600096 A SE9600096 A SE 9600096A SE 9600096 A SE9600096 A SE 9600096A SE 510621 C2 SE510621 C2 SE 510621C2
- Authority
- SE
- Sweden
- Prior art keywords
- rollers
- webs
- nip
- roller
- incident
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83411—Roller, cylinder or drum types
- B29C66/83417—Roller, cylinder or drum types said rollers, cylinders or drums being hollow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/083—Devices involving movement of the workpiece in at least one axial direction
- B23K26/0838—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt
- B23K26/0846—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt for moving elongated workpieces longitudinally, e.g. wire or strip material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/244—Overlap seam welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1696—Laser beams making use of masks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/45—Joining of substantially the whole surface of the articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83411—Roller, cylinder or drum types
- B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/729—Textile or other fibrous material made from plastics
- B29C66/7294—Non woven mats, e.g. felt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
Abstract
Description
15 20 25 30 35 510 621 2 rialbanorna att passera genom nypet hos ett valspar omedel- bart efter att de bestrålats. 15 20 25 30 35 510 621 2 the rial paths to pass through the nip of a pair of rollers immediately after they have been irradiated.
Uppfinningen avser även en anordning för att förbinda löpande materialbanor av fibertyg och/eller plastfilm med varandra eller med absorptionskroppar, varvid åtminstone en av till varandra angränsande materialbanor innehåller termoplastiska element, kännetecknad av ett valspar, mellan vilkets valsar materialbanorna passerar, varvid materialbanorna tryckes ihop i nypet mellan dessa valsar, samt en anordning för att bringa laserstrålar att infalla mot nypet mellan valsparets valsar eller mot ett område i omedelbar närhet därtill.The invention also relates to a device for connecting continuous webs of fibrous fabric and / or plastic film to each other or to absorbent bodies, wherein at least one of adjacent webs of material contains thermoplastic elements, characterized by a pair of rollers, between which rollers the webs run, the webs being compressed in the nip between these rollers, and a device for causing laser beams to be incident on the nip between the roll pair of rollers or on an area in close proximity thereto.
I en föredragen utföringsform av anordningen är en av valspa- rets valsar ihålig och innefattar en axiell inloppsöppning, genom vilken en axiellt riktad laserstråle från en yttre laserkälla infaller, och en rad speglar av en typ, som re- flekterar en del av laserljuset och släpper igenom resten av ljuset, är anordnade utefter den ihåliga valsens rotations- axel, vilka speglar reflekterar infallande laserljus i en riktning vinkelrät mot valsens rotationsaxel så att en rad av laserstrålar infaller mot nypet mellan valsparets valsar eller mot ett område i omedelbar närhet därtill. För varje spegel är en rad av utloppsöppningar anordnade runt omkretsen av den ihåliga valsen, vilka utloppsöppningar ligger i samma plan som den från ifrågavarande spegel reflekterade laser- strålen, och en fokallins är anordnad i strålgången för varje reflekterad laserstråle. Vidare är fokallinserna är så place- rade att de reflekterade laserstrålarnas fokus ligger utanför de materialbanor, som passerar igenom valsnypet, och speglar- na är anordnade att reflektera den infallande laserstrålen så att de reflekterade strålarna träffar de materialbanor, som går igenom valsarnas nyp, strax före passagen av nypet.In a preferred embodiment of the device, one of the rollers of the roller pair is hollow and comprises an axial inlet opening, through which an axially directed laser beam from an external laser source is incident, and a series of mirrors of a type which reflect a part of the laser light and emit through the remainder of the light, are arranged along the axis of rotation of the hollow roller, which mirrors reflect incident laser light in a direction perpendicular to the axis of rotation of the roller so that a row of laser beams incident on the nip between the roller pair rollers or an area in close proximity thereto. For each mirror a row of outlet openings is arranged around the circumference of the hollow roller, which outlet openings lie in the same plane as the laser beam reflected from the mirror in question, and a focal lens is arranged in the beam path for each reflected laser beam. Furthermore, the focal lenses are positioned so that the focus of the reflected laser beams is outside the material paths passing through the nip, and the mirrors are arranged to reflect the incident laser beam so that the reflected beams hit the material paths passing through the nip of the rollers, just before the passage of the pinch.
I en andra utföringsform är en roterande polygonspegel anord- nad att reflektera en infallande laserstråle så att denna träffar valsparets nyp och den infallande laserstrålen ut- göres av en pulsad stråle. 10 15 20 25 30 35 3 510 621 Uppfinningen skall nu beskrivas med hänvisning till bifogade figurer, av vilka; fig. 1 visar en schematisk, delvis genomskuren, sidovy av en första utföringsform av en anordning enligt uppfinningen, fig. 2 visar ett snitt längs linjen II-II i figur 1, fig. 3 visar schematiskt en perspektivy av ett stycke av två materialbanor, vilka förbundits medelst anordningen i figur 1, fig. 4 visar en schematisk sidovy av en andra utföringsform av en anordning enligt uppfinningen, och fig. 5 visar en frontvy av anordningen i figur 4 med bortta- gen främre vals.In a second embodiment, a rotating polygon mirror is arranged to reflect an incident laser beam so that it hits the nip of the roller pair and the incident laser beam is constituted by a pulsed beam. The invention will now be described with reference to the accompanying figures, of which; Fig. 1 shows a schematic, partly sectioned, side view of a first embodiment of a device according to the invention, Fig. 2 shows a section along the line II-II in Fig. 1, Fig. 3 schematically shows a perspective view of a piece of two material webs, which are connected by means of the device in Fig. 1, Fig. 4 shows a schematic side view of a second embodiment of a device according to the invention, and Fig. 5 shows a front view of the device in Fig. 4 with the front roller removed.
Den i figur 1 och 2 visade anordningen innefattar ett valspar 1 med en mothållsvals 2 och en tryckvals 3, vilka på lämpligt sätt är rotationsdrivna i de med pilar i figur 1 indikerade riktningarna. Valsen 3 är ihålig och har en med sin rota- tionsaxel koaxiell öppning 4 upptagen i sin ena sidoyta, den vänstra sidoytan i figur 1. I valsens 3 inre är ett flertal speglar, av vilka två speglar 5,6 visas i figur 1, fast mon- terade och anordnade i rad efter varandra utmed valsens rotationsaxel. Vidare har rader av periferiella öppningar 7 upptagits i valsens 3 mantelyta, vilka rader i antal och axiell belägenhet motsvarar speglarna utmed rotationsaxeln. Öppningarna 7 är upptagna i periferiytorna av ribbor 8,9,lO utformade i valsens 3 mantelyta.The device shown in Figures 1 and 2 comprises a pair of rollers 1 with an abutment roller 2 and a pressure roller 3, which are suitably rotationally driven in the directions indicated by arrows in Figure 1. The roller 3 is hollow and has an opening 4 coaxial with its axis of rotation received in its one side surface, the left side surface in Figure 1. In the interior of the roller 3 a plurality of mirrors, of which two mirrors 5,6 are shown in Figure 1, are fixed. mounted and arranged in a row one after the other along the axis of rotation of the roller. Furthermore, rows of peripheral openings 7 have been accommodated in the circumferential surface of the roller 3, which rows in number and axial position correspond to the mirrors along the axis of rotation. The openings 7 are received in the peripheral surfaces by ribs 8,9, 10 formed in the circumferential surface of the roller 3.
En icke visad laser är anordnad att sända en axiellt riktad laserstråle L genom valsens 3 axiella öppning 4. Speglarna utmed rotationsaxeln är av en typ, som släpper igenom en viss mängd laserljus och reflekterar återstoden. Ljusgenomsläpp- ligheten hos varje spegel är anpassad så att varje reflekte- rad stråle får samma intensitet. Speglarna är riktade så att den infallande laserstrålen reflekteras vinkelrätt mot rota- 10 15 20 25 30 35 51Û 621 4 tionsaxeln och så att de reflekterade strålarna L1-L3 bildar en vinkel a mot ett plan genom rotationsaxlarna hos valsarna 2,3.A laser (not shown) is arranged to send an axially directed laser beam L through the axial opening 4 of the roller 3. The mirrors along the axis of rotation are of a type which transmits a certain amount of laser light and reflects the remainder. The light transmittance of each mirror is adjusted so that each reflected beam has the same intensity. The mirrors are directed so that the incident laser beam is reflected perpendicular to the axis of rotation and so that the reflected beams L1-L3 form an angle α to a plane through the axes of rotation of the rollers 2,3.
I figur 1 och 2 visas även två materialbanor 11,12, vilka lagda ovanpå varandra går igenom nypet mellan valsarna 2,3.Figures 1 and 2 also show two material webs 11,12, which are laid on top of each other and pass through the nip between the rollers 2,3.
Banan 11 utgöres exempelvis av ett fibertyg, ett s.k. non- woven, och banan 12 av en plastfilm.The web 11 consists, for example, of a non-woven fabric, a so-called non-woven, and the web 12 of a plastic film.
Vid drift av anordningen roterar de två valsarna 2,3, av vilka åtminstone en är driven, synkront och drar den samman- satta materialbanan 11,12 igenom nypet mellan valsarna, i vilket materialbanan 11,12 ihoptryckes åtminstone inom om- rådet för ribborna 8,9,10. Under valsens 3 rotation kommer öppningarna 7 successivt att passera de reflekterade laser- strålarna L1-L3, varvid dessa strålar går igenom öppningarna och infaller mot materialbanan 11,12, såsom schematiskt visas i figurerna 1 och 2. Därigenom kommer materialbanan 11,12 att bestrålas och termoplastiska delar kommer att smälta till följd därav. I strålgången för strålarna L1-L3 är fokallinser 13 anordnade, vilka är placerad så att strålarnas L1-L3 fokus blir beläget strax ovanför materialbanan 11,12. I material- banan absorberas det infallande laserljuset och den därigenom upptagna energin får materialbanan att smälta inom de av laserstrålarna L1-L3 påverkade områdena. Genom lämpligt val av fokusläge, intensitet och varaktighet (beror av öppning- arnas 7 dimensioner och valsens 3 rotationshastighet) kan strålarnas inträngningsdjup i materialen 11,12 ges lämpligt värde, så önskat smältförlopp uppkommer. Det inses att la- serstrålarna L1-L3 avskärmas från omgivningen utanför valsen 3 när de de delar av ribborna 8,9,10, som ligger mellan öppningarna 7 passerar strålarna under valsens 3 rotation.During operation of the device, the two rollers 2,3, at least one of which is driven, rotate synchronously and pull the composite web 11,12 through the nip between the rollers, in which the web 11,12 is compressed at least within the area of the ribs 8. , 9.10. During the rotation of the roller 3, the apertures 7 will successively pass the reflected laser beams L1-L3, these beams passing through the apertures and incident on the material web 11,12, as schematically shown in Figures 1 and 2. Thereby the material web 11,12 will be irradiated. and thermoplastic parts will melt as a result. In the beam path of the beams L1-L3, focal lenses 13 are arranged, which are positioned so that the focus of the beams L1-L3 is located just above the material web 11,12. In the web of material, the incident laser light is absorbed and the energy absorbed thereby causes the web of material to melt within the areas affected by the laser beams L1-L3. By suitable choice of focus position, intensity and duration (depending on the dimensions of the openings 7 and the rotational speed of the roller 3), the depth of penetration of the beams into the materials 11,12 can be given a suitable value, so that the desired melting process occurs. It will be appreciated that the laser beams L1-L3 are shielded from the environment outside the roller 3 when the parts of the ribs 8,9,10 which lie between the openings 7 pass the beams during the rotation of the roller 3.
För att förhindra att bestrålning av valsens 3 mantel värmer upp manteln är en värmesänka 14 i form av en mattsvart eloxe- rad kropp av aluminium anordnad innanför manteln och på lämp- ligt sätt rotationsfast förbunden med denna.To prevent irradiation of the casing 3 of the roller 3 from heating up the casing, a heat sink 14 in the form of a matt black anodised body of aluminum is arranged inside the casing and is suitably rotationally connected thereto.
Strax efter att ha utsatts för laserbestrålningen kommer materialbanan 11,12 att passera igenom nypet mellan valsarna 10 15 20 25 30 35 5 510 621 2,3, varvid materialbanan ihoptryckes åtminstone inom om- rådena för ribborna 8,9,10. Således kommer materialbanan att ihoptryckas inom de laserbestrålade områdena och de två materialbanor 11,12, som den sammansatta materialbanan består av, kommer säkert att förbindas med varandra inom dessa områden. Vinkeln a väljes så att lämplig tid förflyter mellan smältfas och ihoptryckningsfas för de bestrålade områdena. I figur 3 visas ett utskuret stycke av en medelst anordningen i figurerna 1 och 2 laminerad materialbana 11,12.Shortly after being subjected to the laser irradiation, the web of material 11,12 will pass through the nip between the rollers 10 15 20 25 30 35 5 510 621 2,3, the web of material being compressed at least within the areas of the ribs 8,9,10. Thus, the web of material will be compressed within the laser irradiated areas and the two webs of material 11,12, of which the composite web of material consists, will surely be connected to each other within these areas. The angle α is selected so that a suitable time elapses between the melting phase and the compression phase of the irradiated areas. Figure 3 shows a cut-out piece of a web 11,12 laminated by means of the device in Figures 1 and 2.
Laserkällan utgöres lämpligen av en C02-laser, vilken har visat sig ge en strålning, som är lämplig för att absorberas i fibermaterial, plastfilm och nonwoven. Exempelvis kan en laser från LASER ECOSE, Skottland med beteckningen LE 3000, vilken har en effekt på upp till 3000 W och en våglängd av 10,6 pm användas för kontinuerlig laserstrålning medan en laser med beteckningen LE 1500 OA kan användas för pulsad laserstrålning med frekvenser upp till 200 kHz. Även andra typer av lasrar är tänkbara att utnyttja.The laser source is suitably a CO 2 laser, which has been found to give a radiation which is suitable for being absorbed into fibrous material, plastic film and nonwoven. For example, a laser from LASER ECOSE, Scotland with the designation LE 3000, which has a power of up to 3000 W and a wavelength of 10.6 μm can be used for continuous laser radiation while a laser with the designation LE 1500 OA can be used for pulsed laser radiation with frequencies up to 200 kHz. Other types of lasers are also conceivable to use.
I den ovan beskrivna utföringsformen åstadkommes ett trera- digt förbindelsemönster. Genom att anordna fler speglar kan naturligtvis förbindningsmönster med fler än tre längsgående rader åstadkommas. Det är även möjligt att utnyttja fler än en laserkälla, exempelvis kan en andra laserkälla vara anord- nad att utsända en stråle, som infaller igenom en axiell öpp- ning i valsens 3 andra sidoyta. Det är även möjligt att ut- forma valsen 3 så att den väsentligen endast består av en mantel, vilket möjliggör att ett i princip obegränsat antal lasrar kan utnyttjas, vilkas strålar med hjälp av speglar på ovan angivet sätt kan anordnas att intermittent bestråla en materialbana på ett sådant sätt att i stort sätt vilket som helst önskat förbindningsmönster kan åstadkommas.In the embodiment described above, a three-line connection pattern is provided. By arranging more mirrors, of course, connection patterns with more than three longitudinal rows can be achieved. It is also possible to use more than one laser source, for example a second laser source can be arranged to emit a beam which falls through an axial opening in the second side surface of the roller 3. It is also possible to design the roller 3 so that it essentially only consists of a sheath, which enables a basically unlimited number of lasers to be used, the beams of which can be arranged in the manner indicated above by means of mirrors to intermittently irradiate a web of material on in such a way that virtually any desired connection pattern can be achieved.
Linserna 13 kan vara förankrade i utrymmet innanför valsens 3 mantelyta förflyttbara i riktningarna för de reflekterade strålarna L1-L3 för att möjliggöra en justering av dessa strålars fokus. Detta möjliggör exempelvis att anordningen kan användas för perforering för alla eller vissa av strå- 10 15 20 25 30 35 510 621 6 larna. Vidare kan vinkeln a vara lika med noll. Det är ej heller alltid önskvärt att alla reflekterade strålar har samma intensitet över valsparets bredd. Om exempelvis ett ytmaterial skall sammanfogas med ett annat ytmaterial i sidopartier av en sammansatt materialbana men med en absorp- tionskropp i den centrala delen av materialbanan kan det vara önskvärt att ha olika intensitet och olika fokus hos de re- flekterade strålarna.The lenses 13 may be anchored in the space inside the mantle surface of the roller 3 movable in the directions of the reflected beams L1-L3 to enable an adjustment of the focus of these beams. This enables, for example, that the device can be used for perforation for all or some of the beams. Furthermore, the angle α can be equal to zero. It is also not always desirable that all reflected rays have the same intensity across the width of the pair of rollers. If, for example, a surface material is to be joined with another surface material in side portions of a composite web of material but with an absorbent body in the central part of the web of material, it may be desirable to have different intensities and different focus of the reflected rays.
I figurerna 4 och 5 visas en andra utföringsform av en ano- rdning enligt uppfinningen. Denna anordning innefattar ett valspar 15 med valsar 16,17, mellan vilka en av två material- banor 18,19 sammansatt materialbana 20 matas. Materialbanorna 18,19 sammanstrålar i nypet mellan valsarna 16,17 och ut- sättes där för bestrålninq av en laserstråle L4 utsänd från en anordning 21. Anordningen 21 innefattar en roterbar kropp 22, som i tvärsnitt har formen av en oktagon och som är rota- tionsdriven i den riktning som indikeras av pilen i figur 5.Figures 4 and 5 show a second embodiment of a device according to the invention. This device comprises a pair of rollers 15 with rollers 16,17, between which a web of material 20 composed of two webs of material 18,19 is fed. The webs of material 18,19 coalesce in the nip between the rollers 16,17 and are exposed there for irradiation by a laser beam L4 emitted from a device 21. The device 21 comprises a rotatable body 22, which in cross section has the shape of an octagon and which is rotatable. driven in the direction indicated by the arrow in Figure 5.
Periferiytan hos denna kropp 22 är försedd med plana speglar 23. En stråle L, som utsänds från en icke visad laserkälla, reflekteras under kroppens 22 rotation via en fokallins 24 och ett prisma 25 successivt av de åtta speglarna 23 och riktas mot nypet mellan valsarna 16,17. Under kroppens 22 rotation kommer vinkeln mot den infallande strålen L hos den plana ytan av varje spegel 23 att variera, vilket medför att den reflekterade strålen L4 kommer att utföra en svepande rörelse i ett plan parallellt med ett radialplan hos kroppen 22, såsom indikeras i figur 5 medelst en dubbelpil. Gränserna för denna svepningsrörelse illustreras med streckade linjer i figur 5. Kroppen 22 är såsom framgår av figurerna anordnad med sin rotationsaxel vinkelrät mot valsarnas 16,17 rota- tionsaxlar så att ovannämnda svepningsplan är parallellt med valsarnas rotationsaxlar.The peripheral surface of this body 22 is provided with planar mirrors 23. A beam L emitted from a laser source (not shown) is reflected during the rotation of the body 22 via a focal lens 24 and a prism 25 successively by the eight mirrors 23 and directed towards the nip between the rollers 16. , 17. During the rotation of the body 22, the angle to the incident beam L of the planar surface of each mirror 23 will vary, causing the reflected beam L4 to perform a sweeping motion in a plane parallel to a radial plane of the body 22, as indicated in FIG. 5 by means of a double arrow. The boundaries of this sweeping movement are illustrated by dashed lines in Figure 5. As can be seen from the figures, the body 22 is arranged with its axis of rotation perpendicular to the axes of rotation of the rollers 16,17 so that the above-mentioned sweeping plane is parallel to the axes of rotation of the rollers.
Laserstrålen L är vidare företrädesvis pulsad för att erhålla ett mönster av diskreta förbindningspunkter. Detta kan åstad- kommas genom att använda en pulsad laser som strålkälla eller genom att anbringa en roterande mask eller liknande i strål- gången. En annan möjlighet att erhålla en pulsad stråle är 10 15 20 25 v 510 621 att utforma speglarna 23 med ett linjemönster av reflekte- rande och icke reflekterande delar. Vid varje svep av strålen L4 åstadkommes således en rad punkter, vilka sträcker sig i en rät linje som lutar något mot en tvärlinje till material- banans 20 eftersom materialbanan förflyttas något mellan varje bestrålningstillfälle. I en variant av den i figurerna 4 och 5 visade utföringsformen kan kroppen 22 anordnas så att svepningsplanet är något lutande mot valsarnas längslinjer om man önskar erhålla exakt tvärgående förbindningslinjer.The laser beam L is further preferably pulsed to obtain a pattern of discrete connection points. This can be achieved by using a pulsed laser as a radiation source or by applying a rotating mask or the like in the beam path. Another possibility of obtaining a pulsed beam is to design the mirrors 23 with a line pattern of reflecting and non-reflecting parts. Thus, at each sweep of the beam L4, a series of points are provided which extend in a straight line inclined slightly towards a transverse line to the web of material 20 as the web of material is moved slightly between each irradiation occasion. In a variant of the embodiment shown in Figures 4 and 5, the body 22 can be arranged so that the sweeping plane is slightly inclined towards the longitudinal lines of the rollers if it is desired to obtain exact transverse connecting lines.
Anordningen 21 kan även användas för att åstadkomma ett perforeringsmönster i ett ytmaterial för att göra detta vätskegenomsläppligt. Någon ihoptryckning av ytmaterialet är då inte nödvändig.The device 21 can also be used to provide a perforation pattern in a surface material to make it liquid permeable. No compression of the surface material is then necessary.
Kroppen 22 kan naturligtvis ges en annan polygon form än den visade för att ge ett annat svepningsområde.The body 22 can of course be given a different polygonal shape than the one shown to give a different sweeping area.
Det påpekas att de visade anordningarna även kan användas för att förbinda en absorptionskropp av fibermaterial eller ett i en absorptionskropp ingående distansskikt, t.ex. av vadd- material, med ett ytmaterial. För att erhålla en acceptabel förbindning måste även i detta fall en ihoptryckning av de materialbanor, som skall förbindas, ske medan de bestrâlade områdena fortfarande befinner sig i smältfas.It is pointed out that the devices shown can also be used for connecting an absorbent body of fibrous material or a spacer layer included in an absorbent body, e.g. of wadding material, with a surface material. In order to obtain an acceptable connection, even in this case a compression of the material webs to be connected must take place while the irradiated areas are still in the melting phase.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9600096A SE510621C2 (en) | 1996-01-11 | 1996-01-11 | Bonding fibrous, absorbent and plastic film layers together to form hygiene products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9600096A SE510621C2 (en) | 1996-01-11 | 1996-01-11 | Bonding fibrous, absorbent and plastic film layers together to form hygiene products |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE9600096D0 SE9600096D0 (en) | 1996-01-11 |
| SE9600096L SE9600096L (en) | 1997-07-12 |
| SE510621C2 true SE510621C2 (en) | 1999-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE9600096A SE510621C2 (en) | 1996-01-11 | 1996-01-11 | Bonding fibrous, absorbent and plastic film layers together to form hygiene products |
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| Country | Link |
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| SE (1) | SE510621C2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1366890A1 (en) * | 2002-05-16 | 2003-12-03 | Leister Process Technologies | Proces and apparatus for joining of synthetic materials at high welding speed |
| EP1405713A1 (en) * | 2002-10-02 | 2004-04-07 | Leister Process Technologies | Process and device for joining three-dimensional plastic parts by a laser beam |
| EP1508428A1 (en) * | 2003-08-22 | 2005-02-23 | Leister Process Technologies | Device for welding flat plastic materials |
-
1996
- 1996-01-11 SE SE9600096A patent/SE510621C2/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1366890A1 (en) * | 2002-05-16 | 2003-12-03 | Leister Process Technologies | Proces and apparatus for joining of synthetic materials at high welding speed |
| US6966968B2 (en) * | 2002-05-16 | 2005-11-22 | Leister Process Technologies | Process and apparatus for joining polymer materials at a high welding speed |
| EP1405713A1 (en) * | 2002-10-02 | 2004-04-07 | Leister Process Technologies | Process and device for joining three-dimensional plastic parts by a laser beam |
| US7211166B2 (en) | 2002-10-02 | 2007-05-01 | Leister Process Technologies | Method and device for joining workpieces made from plastic in three-dimensional form by means of a laser beam |
| EP1508428A1 (en) * | 2003-08-22 | 2005-02-23 | Leister Process Technologies | Device for welding flat plastic materials |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9600096D0 (en) | 1996-01-11 |
| SE9600096L (en) | 1997-07-12 |
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