SE204202C1

SE204202C1 -

Info

Publication number: SE204202C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: W M Scholl och L C Pendergast Prioritet begtird Iran den 7 jctnuari 1959 (USA) Foreliggande uppfinning avser ett forfarande fOr framstallning av genom varme hopfasta foremal, speciellt ett foremal, som är sammansatt av ett stycke av ett skikt av termoplastisk polymetanlattplast, som genom inverkan av varme ar forbundet med en skiva eller ett ark av termoplastiskt filmmaterial. Uppfinningen avser Oxen de genom forfarandet framstallda faremalen. Inventors: WM Scholl and LC Pendergast Priority Started in Iran, January 7, 1959 (USA). of heat is connected to a sheet or sheet of thermoplastic film material. The invention relates to Taurus the hazards produced by the process.

I manga fall har det visat sig vara lampligt att framstalla foremal med onskvard kuddliknande verkan genom att under inverkan av varme hopfdsta ett ark eller en skiva av pa kemisk vag framstallt skummaterial av bedlig typ, och ett lampligt tackmaterial, exempelvis i form av en pa kemisk vag framstalld film. I nagra fall kunna ytterligare nagra skikt av skummaterial eller filmmaterial inga i den fardiga strukturen, beroende pa det andamal, for vilket foremalet är avsett. Bland sadana foremal markas badrumsmattor, stoppningar och dynor for saten och stolar och andra 'nobler samt olika andra andama.l. Sadana utforanden ha befunnits vara sarskilt lampliga for fotdynor, t. ex. i form av inlaggssulor, stodanordningar for fotvalvet i langdriktningen och tvarriktningen, samt sasom medel for att lindra obehagen av forhardnader, liktornar och omma stallen pa foten eller tama. Foremal av hithorande slag kunna Oven anvandas sasom enkla bandage, for-band och plaster. Dà faremal framstallas av material av oven namnt slag, samt eYempel- Dupl. kl. 39 a3: 27/00 vis anvandas for fotdynor, erhalla de atskilli; ga fordelar jamfort med foremal Soni framstains pa hittills vatiligt satt for liknande andamal men av annat material och med skik-: ten inbordes forbundna pa annat att." In- lOggssulor ha salunda exempeivis hitting framstallts av ett skikt av skumlatex, soni tackts med tyg, vid vilket latex-skiktet antingen fastklistrats eller direkt pavulkats. Emellertid medfor ett pa kemisk vag franistain skummaterial, forbundet med en pa ke-: miskt satt framstalld film genom hopfastnine vid ytterkanterna genom inverkan av N;arrne. den fordelen gentemot det kanda 'utforandet; att det sammansatta foremalet blir mera hall-hart, mojliggor bathe ventilation och mera effektivt utesluter icke onskvard skrynkling under anvandningen. Vidare blir produkten. lattare tvattbar och ken darefter torkas pa mycket kort tid saint har battre draghallfasfhet och aven bathe stotda.mpande formaga. En ytterligare fordel Or att foremalet har en tunn, genom inverkan av varme fast, harfin eller kniveggsskarp fog, oavsett antalet an-. vanda skikt. In many cases it has proved expedient to produce molds with an adverse cushion-like effect by, under the influence of heat, joining together a sheet or a sheet of chemically produced foam material of good condition, and a suitable roofing material, for example in the form of a chemical vaguely produced film. In some cases, additional layers of foam or film material may not be present in the finished structure, depending on the purpose for which the article is intended. Among such objects are marked bathroom rugs, upholstery and cushions for the seat and chairs and other 'nobles as well as various other andama.l. Such designs have been found to be particularly suitable for foot pads, e.g. in the form of insoles, standing devices for the arch of the foot in the longitudinal and transverse directions, as well as as a means of relieving the discomfort of hardening, corns and resting the stables on the foot or tame. Forms of this kind can also be used as simple bandages, bandages and plastics. Then hazard templates are made of materials of the kind mentioned above, as well as eYempel- Dupl. at 39 a3: 27/00 wise used for foot cushions, obtain them atskilli; gave advantages compared with foremal Soni appeared in the hitherto vatiligt set for similar purposes but of other material and with the layers: inboard connected to other that. " to which the latex layer is either adhered or directly paved, however, a chemically vague franistain foam material, associated with a chemically produced film by adhesion at the outer edges by the action of the N; that the composite form becomes more hall-hard, enables bath ventilation and more efficiently does not exclude undue wrinkling during use. Furthermore, the product becomes easier to wash and can then be dried in a very short time. additional advantage Or that the foremal has a thin, by the action of heat solid, harpy or razor-sharp joint, regardless of ant alet an-. vanda layer.

Foremal av nu angiven beskaffenhet kunria" framstdllas i varmefiirseglingspressar av lidnd elektronisk typ. Vid kommersiell frainstall= ning av foremal, vid vilka den i varme astadkomna hopfastningsfogen, soni forbinder skikten, fullstandigt bildar foremalets ytter- kontur, är det onskvart, liven om det icke är' nadvandigt, att av ekonomiska skal i ett enda 2 forlopp astadkomma vad som kan benamnas en varrne- och avslitningsfog, dvs. en varmeforseglingsfog, som joke blott hopfogar skikten eller det laminerade material langs en fin, linjeformig omgivande fog, utan aven bildar en avslitningslinje, som mojliggor att overskottsmaterial latt och snabbt kan avrivas frau det fardiga foremalet titan att man hellover anvanda nagot skarverktyg, och pa setdant satt att man erhaller en jamn och val markerad kant pa foremalet. Forms of the type now indicated can be "" produced in heat-sealing presses of a low electronic type. It is customary to achieve from economical shells in a single process what can be called a warp and wear joint, i.e. a heat sealing joint, which joke only joins the layers or the laminated material along a fine, linear surrounding joint, but also forms a wear line, which enables excess material to be easily and quickly torn from the finished titanium formwork by using a splicing tool instead, and in this way obtaining a smooth and selected marked edge on the formwork.

Detta Onskemal har hittills uppfyllts genom att ett ark av vinylskummaterial under inverkan av varme hopfasts med ett skikt av oforstarkt vinylfilm, exempelvis av polyvinylklorid. Denna metod har emellertid aldrig utforts i koramersiell skala med anvandande av polyesterskummaterial av bojlig natur, t. ex. en iso-cyanatskumplast eller polyuretanskum, trots att sokanden tidigare utfort talrika forsok i denna riktning och awn anstrangt sig att erhalla upplysningar om huru ett forfarande av detta slag skall utforas. For enkelhetens skull kommer detta skummaterial att i fortsattningen betecknas shorn polyuretanskum. Dot har sedan Lang tid tillbaka varit Onskvart att anvanda polyuretanskum istallet for vinylskummaterial, enar polyuretanskummaterial her battre isoleringsformaga samt är mera ekonomisk i anvandning. Ekonomin är naturligtvis en vasentlig faktor vid industriell tillverkning, dar konkurrens kan forvantas. This Onskemal has hitherto been fulfilled by a sheet of vinyl foam material under the action of heat fastened together with a layer of unreinforced vinyl film, for example of polyvinyl chloride. However, this method has never been performed on a coramersal scale using polyester foam materials of a flexible nature, e.g. an isocyanate foam or polyurethane foam, despite the fact that the applicant has previously made numerous attempts in this direction and has sought to obtain information on how to carry out such a procedure. For the sake of simplicity, this foam material will hereinafter be referred to as shorn polyurethane foam. For a long time now, Dot has been reluctant to use polyurethane foam instead of vinyl foam material, which combines polyurethane foam material with better insulation and is more economical to use. The economy is, of course, an essential factor in industrial manufacturing, where competition can be distorted.

Ett viktigt andamal med foreliggande uppfinning är att foresla en metod for kommersiell framstallning av foremal med genom inyerkan av varme inborcles hopfogade ark eller skikt av termoplastiskt skumplastmaterial, t. ex. polyuretanskum, och termoplastfilm, t. ex. en oforstarkt (unsupported) vinylfilm. Enligt uppfinningen hopfastes ett stycke av termoplastskummaterial under inverkan av varme med ett ark eller skikt av termoplastfilmmaterial med hjalp av en elektronisk varmeforseglingsapparat, och uppfinningen kannetecknas i huvudsak av att de tva materialen laggas pa varandra och stodjas av ett fast underlag samt utsattas for inverkan av trycket fran en tryckstampel eller dylikt, som pa f8rhand upphettats till en temperatur understigande materialens smaltpunkter, varvid pressstampeln utsattes for inverkan av hogfrekvensstrom for att varmefiirsegla eller genom varme hopfoga materialen med varandra i det omrade darav, som paverkas av press-stampeln. Enligt en lamplig utforingsform av uppfinningen formas press-stampeln pa sadant satt, att den begransar det onskade foremalets ytterkant. Sedan materialen hopfogats med varandra genom inverkan av varme, bortslites overskottsdelen av materialen frau det formade foremalet langs den varmeforseglade fogen som astadkommits av press-stampeln i materialen. Skummaterialet är lampligen b8jligt och kan vara utfort i ark- eller skivform. An important object of the present invention is to propose a method for the commercial production of molds with sheets or layers of thermoplastic foam material joined together by insertion of hot bores, e.g. polyurethane foam, and thermoplastic film, e.g. an unsupported vinyl film. According to the invention, a piece of thermoplastic foam material is bonded under the action of heat with a sheet or layer of thermoplastic film material by means of an electronic heat sealing apparatus, and the invention can be characterized mainly in that the two materials are laid on top of each other and supported by a solid support. from a pressure piston or the like, which has been preheated to a temperature below the melting points of the materials, the press piston being subjected to the action of high frequency current to heat seal or by heat joining the materials together in the area thereof affected by the press piston. According to a suitable embodiment of the invention, the press piston is formed in such a way that it delimits the outer edge of the desired object. After the materials have been joined together by the action of heat, the excess part of the materials is worn away from the shaped article along the heat-sealed joint provided by the press punch in the materials. The foam material is suitably flexible and can be made in sheet or disc form.

For att underlatta uppfinningens beskrivning visas en utforingsform darav pa bifogade ritningar, dal. fig. 1 underifran visar ett utforande av en press-stampel, som kan anvandas i en elektronisk varmefOrseglingspress for genomforande av forfarandet enligt uppfinningen. Fig. 2 visar vissa delar isarforda frau varandra, sedda frau sidan och askadliggor huru presstampeln enligt fig. 1 anvandes enligt uppfinningen. Fig. 3 visar en del av pressen i vertikalsektion, delvis i elevation, och askadliggor huru framstallningen av ett fore-ml fullbordas under anvandande av pressstampeln enligt fig. 1 och 2. Fig. 4 visar i storre skala en vertikalsektion av sjalva pressstampelelementet. Fig. 5 visar en del av det fardiga foremalet i planvy och askadliggor huru overskottsmaterialet avskiljes Iran det fardiga fOremalet. Fig. 6 är en vertikal tvarsektion, i huvudsak utmed linjen VI—VI i fig. 5 och fig. 7 är en planvy av ett foremal med annan form Dir att askadliggora uppfinningens mangsidiga anvandbarhet. To facilitate the description of the invention, an embodiment thereof is shown in the accompanying drawings, valley. Fig. 1 is a bottom view of an embodiment of a press piston which can be used in an electronic heat sealing press for carrying out the method according to the invention. Fig. 2 shows certain parts from each other, seen from the side and ashes, showing how the press stamp according to Fig. 1 was used according to the invention. Fig. 3 shows a part of the press in vertical section, partly in elevation, and shows how the production of a mold is completed using the press punch according to Figs. 1 and 2. Fig. 4 shows on a larger scale a vertical section of the press punch element itself. Fig. 5 shows a part of the finished form in plan view and shows how the excess material is separated from the finished form. Fig. 6 is a vertical cross-section, substantially along the line VI-VI in Fig. 5, and Fig. 7 is a plan view of a mold of another shape Dir to illustrate the versatility of the invention.

Pa ritningarna ha samma hanvisningsbeteckningar anvants for att beteckna samma eller liknande delar. In the drawings, the same reference numerals have been used to denote the same or similar parts.

Ehuru fOreliggande uppfinning omfattar hela eller partiella lamineringar, overstigande ett antal av tva, i skummaterialskiktet eller filmmaterialskiktet, och med dessa laminat vartdera varmehopfogade med ett eller flera av de andra laminaten, visas och beskrives for enkelhetens skull uppfinningsforemalet i form av en fotdyna med endast ett skum- och ett filmmaterialskikt. I utforingsformen enligt fig. 1-6 avses framstallning av en fotdyna i form av en hel inlaggssula fOr fritt inforande i en fotbekladnad, t. ex. en toffel eller sko. Although the present invention encompasses whole or partial laminations, in excess of two, in the foam material layer or film material layer, and with these laminates each heat sealed with one or more of the other laminates, the inventive form is shown and described for simplicity with only one foot pad foam and a film material layer. In the embodiment according to Figs. 1-6, the manufacture of a foot pad in the form of an entire insole for free insertion in a foot covering, e.g. a slipper or shoes.

For framstallning av ifragavarande foremai enligt uppfinningen anvandes en pressstampel, som ar forsedd med en fardigframstand metallisk underlagsplatta 1 av ledande material, som uppbar ett presstampelelement foretradesvis av massing eller dylikt val varmeledande material. Presstampelelementet 2 är fast vid underlagsplattan 1 pa lampligt att. Donna presstampel anvandes i en elektronisk varmefOrseglingspress av kant slag. For the production of the mold according to the invention, a press stamp is used, which is provided with a ready-made metallic base plate 1 of conductive material, which supported a press stamp element preferably of pulp or similar heat-conducting material. The press stamp element 2 is fixed to the base plate 1 in a suitable manner. Donna press stamp is used in an electronic heat sealing press of edge type.

Pressen visas schematiskt i fig. 2 och omfattar en vertikalt fram och ater rorlig kolv som drives av en lamplig mekanism och vid sin nedre ande uppbar ett huvud 4, vid vilket presstampeln 1, 2 kan vara lostagbart fastsatt pa lampligt Ott. I det visade fallet är huvudet 4 forsett med ett inre, elektriskt upp- 3 hettningselement 5, som kan vara forbundet med en ldmplig anslutning medelst ledningar 6 och 7. Aktiveringen av upphettningselementet i huvudet 4 sker separat fran aktiveringen av den med pressen forbundna elektroniska eller hogfrekvensanordningen. The press is shown schematically in Fig. 2 and comprises a vertically reciprocating piston which is driven by a lamp mechanism and at its lower end carried a head 4, at which the press piston 1, 2 can be releasably attached to the lamp Ott. In the case shown, the head 4 is provided with an internal, electric heating element 5, which may be connected to a suitable connection by means of lines 6 and 7. The activation of the heating element in the head 4 takes place separately from the activation of the electronic or the high frequency device.

Pressen omfattar awn en basplatta eller negativ elektrod 8, ph vilket det material, som skall varmefogas, anbringas. Ehuru uppfinningen med framgang kan genomforas genom att det fardiga foremalets understa skikt eller laminering anbringas direkt pa den obeklddda, metalliska basplattan 8, är det stundom fordelaktigt att anvanda ett mellanskikt for att Oka presstampelns 1, 2 livsldngd. Om ett sadant mellanskikt anses vara nodvandigt, kan det vara utfort i form av en skiva eller ett ark 9 av fenolmaterial eller annat dielektriskt isolerande material. Da. skummaterialet ldmpligen omfattar ett ark eller en. skiva av polyuretanskum, och detta skummaterial har en viss benagenhet att fastna vid en fenolyta, dr det lampligt att anvanda ett tunnare ark ovanpa huvudmellanskiktet 9, och detta tunnare ark kan framstallas av plast, bestaende av tetrafluoreten-polymer eller ett fluorkarbonharts, vid vilket polyuretanskummaterialet icke fastnar fore eller efter det att varmefogningsforloppet har genomforts. The press comprises awn a base plate or negative electrode 8, ph to which the material to be heat-sealed is applied. Although the invention can be successfully carried out by applying the bottom layer or lamination of the finished article directly to the uncoated, metallic base plate 8, it is sometimes advantageous to use an intermediate layer in order to increase the service life of the press stamp 1, 2. If such an intermediate layer is considered to be necessary, it may be in the form of a disc or sheet 9 of phenolic material or other dielectrically insulating material. Yes. the foam material typically comprises a sheet or a. sheet of polyurethane foam, and this foam material has a certain tendency to adhere to a phenol surface, where it is convenient to use a thinner sheet on top of the main intermediate layer 9, and this thinner sheet can be made of plastic, consisting of tetrafluoroethylene polymer or a fluorocarbon resin, in which the polyurethane foam material does not stick before or after the heat joint process has been completed.

Av fig. 3 och 4, sdrskilt fig. 4, framgar att presstampelelementet 2 foretradesvis är utfort i form av ett andlost band av remsformigt material. Presselementet är dven fOretrddesvis sa format, att det bildar en rak lure vdgg 11, en rak yttre vagg 12, en huvudsakligen plan eller flack samt smal arbetskant 13 med mindre bredd an vdggtjockleken, samt en lutande yta 14 pa insidan, som leder fran arbetskantens 13 innerkant till vaggen 11. Denna form av presstdmpeln har befunnits vara tillfredsstallande for anvandning i samband med det med uppfinningen avsedda andamalet. Sasom exempel utan begransande syfte kan ndmnas att en lamplig tjocklek hos pressstdmpelelementviiggen vid anvandning tillsammans med ett skummaterialark med en tjocklek av ungefdr 4,7 mm kan vara ungefdr 1,25 mm, och kanten eller eggen 13 kan med tillfredsstallande resultat ha en tjocklek av ungefar 5/8 av vaggtjoekleken. Den lutande ytans 14 lutningsvinkel är icke kritisk och kan med tillfredsstallande resultat uppga till ungefdr 45°. From Figs. 3 and 4, in particular Fig. 4, it appears that the press stamp element 2 is preferably designed in the form of a breathable strip of strip-shaped material. The press element is also preferably so shaped that it forms a straight lure wall 11, a straight outer wall 12, a substantially flat or flat and narrow working edge 13 with a width less than the wall thickness, and an inclined surface 14 on the inside, which leads from the working edge 13. inner edge of the cradle 11. This form of press stamp has been found to be satisfactory for use in connection with the spirit of the invention. By way of non-limiting example, it may be mentioned that a suitable thickness of the compression molding element cradle when used with a sheet of foam material having a thickness of about 4.7 mm may be about 1.25 mm, and the edge or edge 13 may have a satisfactory result of a thickness of about 5/8 of the cradle toy. The angle of inclination of the inclined surface 14 is not critical and can with satisfactory results amount to approximately 45 °.

Vid framstallning av en inlaggssula, all- mant betecknad med 15 i fig. 5 och 6, lagges en skiva eller ett ark 16 av polyuretanskum- material direkt pa den obeklddda basplattan 8 eller ph mellanskiktet 10, alltefter onskan. Ovanpa detta skummaterialskikt anbringas ett skikt eller ark 17 av termoplastfilm, och detta skikt 17 kan med tillfredsstallande resultat besta av ofOrstarkt (unsupported) vinylfilm, ehuru uppfinningen icke är begrdnsad liar-till. In making an insole, generally designated 15 in Figures 5 and 6, a sheet or sheet 16 of polyurethane foam material is laid directly on the uncoated base plate 8 or the intermediate layer 10, as desired. A layer or sheet 17 of thermoplastic film is applied on top of this foam material layer, and this layer 17 may with satisfactory results consist of unsupported vinyl film, although the invention is not limited thereto.

Innan eller efter det att arken eller skikten 16 eller 17 anbringats pa sin plats, Ras tem- peraturen hos presstdmpelelementet 2 genom inverkan av upphettningselementet 5. Denna begynnande Wining av presstdmpelelementets temperatur utgiir ett betydelsefullt moment vid metoden enligt uppfinningen och pressstampelelementets temperatur kan variera i beroende av skummaterialskiktets 16 tjock- lek, Sasom exempel utan begransan.de syfte kan ndmnas att en tillfredsstallande tempera- tur for presstdmpelelementet med ett skummaterialskikt av ungefar 4,7 mm tjocklek dr c:a 120° C. Before or after the sheets or layers 16 or 17 have been applied in place, the temperature of the press-stamp element 2 is raised by the action of the heating element 5. of the thickness of the foam material layer 16, As an example without limitation.

Kolven 3 sankes ddrefter och pressar pressstdmpelelementet 2 i kontakt med de pa var- andra anbragta skikten 16 och 17 till det i fig. 3 visade ldget. Samtidigt med att presstampelelementets kant 13 kommer i beroring med det ovre skiktet 17 aktiveras pressens elektroniska anordning med lag radiofrekvens dvs. hogfrekvent strom. Detta resulterar i att man erhaller en tillfredsstddlande varmeforseglingsfog 18. The piston 3 is then lowered and presses the press stamp element 2 in contact with the superimposed layers 16 and 17 to the blank shown in Fig. 3. At the same time as the edge 13 of the press stamp element comes into contact with the upper layer 17, the electronic device of the press is activated with a low radio frequency, i.e. high frequency current. This results in obtaining a satisfactory heat seal joint 18.

End'. presstdmpelelementet 2 har en form, som motsvarar det avsedda foremalets kon- tur, forloper vanneforseglingsfogen kontinu- erligt kring foremalets eller inlaggssulans 15 begransningskant i det visade exemplet. Sa- som visas är den framstallda inldggssulan 15. avsedd for anvandarens vanstra fot och det torde utan vidare inses att en motsvarande presstampel anvdndes for framstallning av en inlaggssula for den hogra foten. End '. the pressure stamp element 2 has a shape which corresponds to the contour of the intended article, the water sealing joint extends continuously around the limiting edge of the article or insole 15 in the example shown. As shown, the insole 15 produced is intended for the user's left foot and it should be readily understood that a corresponding press stamp was used to make an insole for the right foot.

Presstampeln passerar icke helt genom hada skikten 16 och 17, utan sammansmalter dessa skikt vid fogen 18, och denna fog tjanstgor aven sasom en avslitningsfog, vilken mojligatt overskottsmaterial omkring det fardiga foremalet lätt kan avrivas fran detta fdr- diga foremal sasom visas vid 19 i fig. 5 och 6. Sedan overskottsmaterialet har avrivits frail det fardiga foremalet, framtrader den varme- forseglade fogen vid foremalets begransnings- kant sasom en fin, linjeformig, jamn och vat avgransad fog, varvid de hada skiktens kant- parti uppvisar en bestdmd krokning i rikt- ning mot denna fina linjeformiga fog. Foretradesvis finnes icke heller flagon hopfdstning mellan det ovre skiktet och det nedre skiktet utom vid vdrmeforseglingsfogen, varfor dessa skikt i ovrigt icke dro hopfdsta med varandra, sasom visas genom det i overdriven skala askadliggjorda mellanrummet 20 i fig. 6. The press punch does not pass completely through the had layers 16 and 17, but melts these layers together at the joint 18, and this joint also serves as a wear joint, which possible excess material around the finished form can be easily torn from this finished form as shown at 19 in fig. 5 and 6. After the excess material has been torn from the finished form, the heat-sealed joint appears at the boundary edge of the form as a fine, linear, even and water-delimited joint, the edge portion of the had layers having a definite hook in rich against this fine linear joint. Preferably, there is also no flake adhesion between the upper layer and the lower layer except at the heat seal joint, so that these layers otherwise do not pull together with each other, as shown by the excessively scaled gap 20 in Fig. 6.

For nd.rvarande är det icke majligt att exakt forklara, varfor den nu beskrivna metoden 4 medf6r den onskade varme- och avslitningshopfogningen mellan polyuretanskummaterial och en termoplastisk film, exempelvis oforstarkt vinylfilm, men det antages att varmet i presstampelelementet 2, harrorande fran upphettningselementet 5, medfor en viss smaltning av skikten 16 och 17 och att inverkan av lag radiofrekvent strom medelst den elektroniska anordningen i pressen bidrager till att astadkomma effektiv sammansmaltning av skiktens smalta delar samt medfOr god fOrsegling och hopfogning, sarskilt vid den varmeforseglade fogens undre sida. At present it is not possible to explain exactly why the method 4 now described entails the desired heat and abrasion joining between polyurethane foam material and a thermoplastic film, for example unreinforced vinyl film, but it is assumed that the heat in the press stamp element 2, emanating from the heating element 5, entails a certain melting of the layers 16 and 17 and that the influence of law radio frequency current by means of the electronic device in the press contributes to achieving efficient fusion of the narrow parts of the layers and results in good sealing and joining, especially at the lower side of the heat-sealed joint.

I fig. 7 visas en for stOd av foten avsedd dyna eller kudde av annan form for att illustrera att uppfinningen kan avsevart modifieras i avseende a det framstallda foremalets storlek och form. I detta fall har fotstOdanordningen formen av en med hal fOrsedd dyna med en ovre termoplastfilm 21, ett inre polyuretanskumskikt 22 och en undre termoplastfilm 23, samtliga tre lamineringar eller skikt hopfasta med varandra genom inverkan av varme kring begransningskanten sasom visas vid 24, samt aven hopfasta med varandra genom inverkan av varme kring oppningen genom dynan sasom visas vid 25. Bada dessa varmeforseglade fogar aro av samma natur som den ovan beskrivna, och de kunna utfOras i samma eller i ett enda forlopp. ForemM med annan och olika form samt storlek kunna framstallas enligt uppfinningen sasom tor-de inses av envar fackman. Ehuru de pa varandra anbragta materialen enligt den foredragna metoden uppbaras pa ett i huvudsak horisontellt stOd eller underlag, är det mojligt att anvanda ett vertikalt stOd med skummaterialet och filmen uppburna genom att de hanga ned fran ett faste utmed stOdet, varvid presstampeln fOres i horisontell riktning for att astadkomma varmehopfogningen, eller ocksa kunna materialen uppbaras i godtycklig vinkel mot horisontalplanet. Det termoplastiska skummaterialet är foretradesvis bojligt och i ark- eller skivform samt kan besta av godtyckligt, genom varme hopfastbart termoplastiskt material, liven inlduderande polyuretan, en polyester eller polyvinylskummaterial. Fig. 7 shows a pad or cushion of another shape intended for the support of the foot to illustrate that the invention can be considerably modified with respect to the size and shape of the manufactured article. In this case, the footrest device is in the form of a slippery pad with an upper thermoplastic film 21, an inner polyurethane foam layer 22 and a lower thermoplastic film 23, all three laminations or layers bonded together by the action of heat around the boundary edge as shown at 24, and also fixed with each other by the action of heat around the opening through the pad as shown at 25. Both these heat-sealed joints are of the same nature as the one described above, and they can be made in the same or in a single process. Shapes with different and different shapes and sizes can be produced according to the invention as will be appreciated by any person skilled in the art. Although the superimposed materials according to the preferred method are supported on a substantially horizontal support or substrate, it is possible to use a vertical support with the foam material and the film supported by hanging down from a fastener along the support, the press punch being carried in the horizontal direction. to effect the heat accumulation, or the materials can also be supported at any angle to the horizontal plane. The thermoplastic foam material is preferably flexible and in sheet or disc form and may consist of any thermoplastic thermoplastic material, web-containing polyurethane, a polyester or polyvinyl foam material.

Av den nu lamnade beskrivningen torde framga att uppfinningen mojliggor en framgangsrik metod for varmehopfogning av polyuretanskurnmaterial och en termoplastisk film, exempelvis for framstallning av en. synnerligen Unbar och varaktig fotdyna under anvandande av polyuretanskummaterial, en polyesterskumprodukt eller polyvinylskummaterial. Metoden kan genomforas pa ekon.omiskt fordelaktigt satt, och det erhallna fOremalet ar ekonomiskt, saval I avseende a fram;. stallning som betraffande anvandningen pa grund av dess hallbarhet. From the description now described, it should be apparent that the invention enables a successful method for heat-joining polyurethane foam material and a thermoplastic film, for example for producing one. extremely unbar and durable foot pad using polyurethane foam, a polyester foam product or polyvinyl foam. The method can be carried out in an economically advantageous manner, and the object obtained is economical, as far as it is concerned. position as regards the use due to its durability.

Claims

Patent claim:

A method of joining, by the action of heat, a piece of thermoplastic foam material and a sheet or sheet of thermoplastic film material by means of an electronic heat sealing device, characterized in that foam material in the form of polyurethane slat plastic, and said film material being applied to each other and supported by a solid substrate, and that a press piston preheated to a temperature below the melting points of the materials or the like is pressed against the superimposed materials and activated with a high-frequency current to join the materials in the area thereof, which is affected by the press stamp, by the action of heat.

Salt according to patent claim 1, characterized in that the press stamp has a shape which defines the outer edge of the desired object, and that, after the materials have been joined by the action of heat, an excess part of the materials is torn away or abraded from the limiting contour contour along the heat sealed joint. , provided by the press stamp in the materials,

3. A set according to claim 1 or 2, characterized in that the polyurethane lath plastic is flexible and suitable in sheet or disc form, applied to the film material.

4. Set according to any one of patent claims 1-3, characterized in that the film market or the disc consists of vinyl film, preferably unsupported vinyl film.

5. A claim according to any one of claims 1-4, characterized in that the polyurethane slat plastic in the form of a sheet or disc is applied to a substantially horizontal, solid support, and that the film sheet or slab is laid on the supported foam sheet or disc, and that in advance the heated press piston is pressed against the superimposed sheets or sheets and is activated to effect heat sealing and fastening of the sheets or sheets.

6. Set according to any one of patent claims 1-5, characterized in that the press stamp is preheated to a temperature Indian about 75 and 150 ° C.

7. Set according to the claims of claims 1-6, characterized in that the press stamp is preheated to a temperature exceeding about 95 ° C, suitably about 120 ° C, depending on the thickness of the polyurethane slat plastic,

8. according to any one of claims 1 to 7, characterized in that the press stamp is heated to approximately 120 ° C when the thickness of the foam material amounts to approximately 4.7 mm at the area thereof, which is to be joined by the action of heat.

9. By the action of heat joined preformed by the set according to any of claims 1-8. Request publications: Patents frein France 1,134,074; Switzerland 312 663.