SE511004C2 - Ultrasonic assembly with annular working part which includes a flanged projection extending around the working part - Google Patents
Ultrasonic assembly with annular working part which includes a flanged projection extending around the working partInfo
- Publication number
- SE511004C2 SE511004C2 SE9803091A SE9803091A SE511004C2 SE 511004 C2 SE511004 C2 SE 511004C2 SE 9803091 A SE9803091 A SE 9803091A SE 9803091 A SE9803091 A SE 9803091A SE 511004 C2 SE511004 C2 SE 511004C2
- Authority
- SE
- Sweden
- Prior art keywords
- working part
- ultrasonic
- working
- annular
- mass
- 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
- 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
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
- B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
- B29C65/085—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary sonotrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
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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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
- B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
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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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
- B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
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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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/63—Internally supporting the article during joining
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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
-
- 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
-
- 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
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8167—Quick change joining tools or surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/70—Specific application
- B06B2201/72—Welding, joining, soldering
-
- 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
- B29C66/90—Measuring or controlling the joining process
- B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
- B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
- B29C66/9513—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools characterised by specific vibration frequency values or ranges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Making Paper Articles (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
15 20 25 30 35 511 004 matningsdelen till arbetsdelen överförbara svängningar. I en ringformig arbetsdel sprids svängningarna huvudsakligen likformigt runt arbetsdelens omkrets, varvid de axiella, utmed matningsdelens centrumlinje fram- och återgående ultraljudsvågorna på grund av sonotrodens ringform omvandlas till radiella vågor, vilka rör sig fram och àter utmed de från arbetsdelens centrum sig sträckande radierna. Det är härvid av synnerlig vikt att den ringformiga arbetsdelens omkrets är avstämd till den aktuella våglängd, som alstras av ultraljudskällan. Närmare bestämt måste arbetsdelen ha en medeldiameter som ärså vald att precis en våglängd av ultraljudet ryms runt arbetsdelens medelomkrets. Eftersom arbetsdelens svängningsmönster och frekvens i viss mån även påverkas av det material som arbetsdelen är tillverkad av (vanligen titan) kan viss justering av medeldiameter och medelomkrets göras genom lämpligt materialval. 15 20 25 30 35 511 004 feed part to the working part transferable oscillations. In an annular working part, the oscillations are distributed substantially uniformly around the circumference of the working part, the axial ultrasonic waves reciprocating along the centerline of the feed part being converted due to the ring shape of the sonotrode to radial waves which move back and forth along the radii extending from the working part. It is of particular importance here that the circumference of the annular working part is matched to the actual wavelength generated by the ultrasonic source. More specifically, the working part must have an average diameter which is chosen so that exactly one wavelength of the ultrasound fits around the average circumference of the working part. Since the oscillation pattern and frequency of the working part are to some extent also affected by the material of which the working part is made (usually titanium), some adjustment of the average diameter and average circumference can be made by suitable material choice.
Eventuella avvikelser från den ringformiga arbetsdelens rotationssymmetriska form medför också negativt inverkande oregelbundenheter i svängningsmönstret, och vid hittills kända tillämpningar har man därför utnyttjat ringformiga arbetsdelar med helt rotationssymmetrisk form och med huvudsakligen cylindrisk eller svagt konisk, mot ringens centrum vänd arbetsyta. Särskilda åtgärder har också vidtagits vid den mekaniska anslutningen mellan ultraljudskällan/matningsdelen och den ringformiga arbetsdelen (PCT ansökan PCT/lB98/00897).Any deviations from the rotationally symmetrical shape of the annular working part also entail adversely affecting irregularities in the oscillation pattern, and in hitherto known applications, annular working parts with a completely rotationally symmetrical shape and with a substantially cylindrical or slightly conical working surface facing the center of the ring have therefore been used. Special measures have also been taken for the mechanical connection between the ultrasonic source / feed part and the annular working part (PCT application PCT / lB98 / 00897).
Eftersom det inom förpackningstekniken är önskvärt att tillverka förpackningsbehållare med andra tvärsnittsformer än runda eller svagt koniska är det ett önskemål att ombesörja ultraljudsaggregat med icke blott ringformiga arbetsdelar utan även t.ex. mànghörniga (t.ex. sex- eller åttakantiga) eller ovala för att t.ex. kunna svetsa bottengavlari hexagonalt formade förpackningskroppar. Med termen "månghörnig" avses härvid även de mer eller mindre avrundade övergångsformer som är tänkbara mellan en flerhörnig och en cirkulärcylindrisk form. Alltför "vassa" hörn är i praktiken ej heller önskvärda, eftersom det orsakar alltför höga spänningar i hornets arbetsdel.Since it is desirable in packaging technology to manufacture packaging containers with other cross-sectional shapes than round or slightly conical, it is desirable to provide ultrasonic assemblies with not only annular working parts but also e.g. polygonal (eg hexagonal or octagonal) or oval to e.g. be able to weld bottom gables in hexagonally shaped packaging bodies. The term "polygonal" also refers to the more or less rounded transition shapes that are conceivable between a polygonal and a circular-cylindrical shape. Too "sharp" corners are also not desirable in practice, as they cause too high stresses in the working part of the horn.
Ett ändamål med föreliggande uppfinning är således att ombesörja ett ultraljudsaggregat med en ringformig arbetsdel, vilken har en oregelbunden, t.ex. oval eller månghörnig arbetsyta.An object of the present invention is thus to provide an ultrasonic assembly with an annular working part, which has an irregular, e.g. oval or polygonal work surface.
Ett ytterligare ändamål med föreliggande uppfinning är att ombesörja en ringformig arbetsdel för ett ultraljudsaggregat, vilken arbetsdel trots att den har en oregelbunden, t.ex. månghörnig arbetsyta icke ställer krav på särskild anpassning av vare sig ultraljudskällans frekvens eller arbetsdelens material.A further object of the present invention is to provide an annular working part for an ultrasonic assembly, which working part despite having an irregular, e.g. polygonal work surface does not require special adjustment of either the frequency of the ultrasonic source or the material of the working part.
Ett ytterligare ändamål med föreliggande uppfinning är att ombesörja en ringformig arbetsdel för ett ultraljudsaggregat, vilken arbetsdel trots valfriheten vad beträffar arbetsytans form gör det möjligt att effektivt och utan onödiga förluster överföra svängningar från ultraljudskällan till önskade delar av ett bearbetat föremål, t.ex. en förpackningsbehållare. 10 15 20 25 30 35 511 004 Ett ytterligare ändamål med föreliggande uppfinning är slutligen att åstadkomma en ringformig arbetsdel med oregelbunden arbetsyta, vilken arbetsdel har okomplicerad form, är enkel att tillverka samt inte utsättes för överdrivna påkänningar i samband med ultraljudssvetsning.A further object of the present invention is to provide an annular working part for an ultrasonic assembly, which working part, despite the freedom of choice as regards the shape of the working surface, makes it possible to efficiently and without unnecessary losses transmit oscillations from the ultrasonic source to desired parts of a machined object, e.g. a packaging container. 5 15 004 A further object of the present invention is finally to provide an annular working part with an irregular working surface, which working part has an uncomplicated shape, is easy to manufacture and is not subjected to excessive stresses in connection with ultrasonic welding.
Ovannämnda och andra ändamål har enligt uppfinningen uppnåtts genom att ett ultraljudsaggregat av den inledningsvis beskrivna typen getts de av patentkravet 1 framgående kånnetecknen.According to the invention, the above-mentioned and other objects have been achieved by giving an ultrasonic assembly of the type initially described to the key features set forth in claim 1.
Föredragna utföringsformer av ultraljudsaggregatet enligt uppfinningen har vidare getts de av underkraven framgående kånnetecknen.Preferred embodiments of the ultrasonic assembly according to the invention have further been given the key features set forth in the subclaims.
Genom att placera arbetsdelens månghörniga arbetsyta på ett utskott, vars massa endast utgör en mindre del av arbetsdelens totala massa blir det möjligt att ombesörja en t.ex. oval eller månghörnig arbetsyta utan att i nämnvärd utsträckning förändra arbetsdelens ringform. Härigenom kan svetsning av t.ex. hexagonala föremål genomföras utan att tidigare olägenheter uppkommer.By placing the polygonal work surface of the work part on a committee, the mass of which constitutes only a small part of the total mass of the work part, it becomes possible to provide a e.g. oval or polygonal work surface without significantly changing the annular shape of the workpiece. In this way, welding of e.g. hexagonal objects are carried out without incurring previous inconveniences.
En föredragen utföringsform av ultraljudsaggregatet enligt uppfinningen kommer nu att beskrivas närmare under särskild hänvisning till bifogade ritningar, vilka blott visar de för förståelse av uppfinningen oundgängliga detaljerna.A preferred embodiment of the ultrasonic assembly according to the invention will now be described in more detail with particular reference to the accompanying drawings, which only show the details which are indispensable for understanding the invention.
Fig. 1 visar schematiskt från sidan ett ultraljudsaggregat enligt uppfinningen.Fig. 1 shows diagrammatically from the side an ultrasonic assembly according to the invention.
Fig. 2 visar i större skala en arbetsdel vid ultraljudsaggregatet enligt fig. 1.Fig. 2 shows on a larger scale a working part of the ultrasonic assembly according to Fig. 1.
Fig. 3 är ett snitt genom arbetsdelen enligt fig. 2.Fig. 3 is a section through the working part according to Fig. 2.
Ett ultraljudsaggregat 1 enligt uppfinningen är i sin föredragna utföringsform avsett för sammansvetsning av förpackningsbehållardelar med ringformigt, sexhörnigt tvärsnitt, vilket är ett exempel på användningen av ultraljudssvetsteknik inom förpackningsindustrin. En förutsättning för att ultraljudsteknik skall kunna användas för sammansvetsning av förpackningsmaterial är att åtminstone något av de ingående materialskikten innefattar ett material som kan plastificeras av ultraljudsvågor. l praktiken innefattar förpackningsbehållare, i varje fall de som är avsedda för helt eller delvis vätskeformigt fyllgods, ofta skikt av termoplastiskt material, vilket är synnerligen lämpligt att ultraljudssvetsa. De materialskikt som skall förenas med varandra måste härvid innefatta en kontaktyta som innehåller termoplastiskt material, t.ex. polyeten, vilket gör det möjligt att företrädesvis efter anpressning av de båda materialskikten mot svetsaggregatets arbetsyta med hjälp av någon form av mothàll ultraljudsvibrera materialet så att termoplastskikten plastificeras och smälter samman för att vid avslutad ultraljudsuppvärmning åter svalna och stelna, varvid termoplasten fungerar såsom lim som varaktigt och vätsketätt förenar de ingående förpackningsbehållardelarna med varandra. Denna teknik är välkänd t.ex. från tidigare nämnda amerikanska patentskrift US-PS 3.438.824 samt PCT ansökan PCT/lB98/00897, till vilka hänvisas för ytterligare information och tekniska detaljer. 10 15 20 25 30 35 511 004 lfig. 1 visas ett ultraljudsaggregat 1 enligt uppfinningen. Aggregatet 1 innefattar en ultraljudskälla eller konverter 2 av känd typ, vilken medelst t.ex. en piezoelektrisk kristall omvandlar elektriska strömvariationer till mekanisk rörelse i form av fram- och återgående ultraljudsvågor eller vibrationer som vid den beskrivna tillämpningen, d.v.s. svetsning av papper/plastförpackningar, typiskt har ett frekvensomráde av ca. 15-50 kHz, vanligen 20 kHz. Ultraljudskällan 2, som på ett känt (icke visat) sätt är förbunden med en strömkälla är även mekaniskt förbunden med en matningsdel eller booster 3 för förstärkning eller omformning av de av ultraljudskällan alstrade ultraljudsvàgorna.An ultrasonic assembly 1 according to the invention is in its preferred embodiment intended for welding together packaging container parts with an annular, hexagonal cross-section, which is an example of the use of ultrasonic welding technology in the packaging industry. A prerequisite for ultrasonic technology to be used for welding together packaging material is that at least one of the constituent layers of material comprises a material that can be plasticized by ultrasonic waves. In practice, packaging containers, in any case those intended for wholly or partly liquid fillers, often comprise layers of thermoplastic material, which is particularly suitable for ultrasonic welding. The material layers to be joined together must in this case comprise a contact surface which contains thermoplastic material, e.g. polyethylene, which makes it possible, preferably after pressing the two material layers against the working surface of the welding assembly, by means of some kind of abutment to ultrasonically vibrate the material so that the thermoplastic layers are plasticized and fused to cool and solidify again upon completion of ultrasonic heating. and liquid tight, the constituent packaging container parts join together. This technique is well known e.g. from the aforementioned U.S. Pat. No. 3,438,824 and PCT application PCT / IB98 / 00897, to which reference is made for further information and technical details. 10 15 20 25 30 35 511 004 lfig. 1 shows an ultrasonic assembly 1 according to the invention. The unit 1 comprises an ultrasonic source or converter 2 of known type, which by means of e.g. a piezoelectric crystal converts electrical current variations into mechanical motion in the form of reciprocating ultrasonic waves or vibrations as in the described application, i.e. welding of paper / plastic packaging, typically has a frequency range of approx. 15-50 kHz, usually 20 kHz. The ultrasonic source 2, which in a known (not shown) manner is connected to a current source, is also mechanically connected to a supply part or booster 3 for amplifying or reshaping the ultrasonic waves generated by the ultrasonic source.
Matningsdelen 3 bestämmer även vágornas nodpunkt och utnyttjas pà konventionellt sätt även för upphängning av ultraljudsaggregatet 1 i ett icke visat stativ. Matningsdelen 3 är således vid sin ena ände mekaniskt förbunden med ultraljudskällan 2, och matningsdelens 3 motsatta ände är mekaniskt förbunden med en sluten eller ringformig arbetsdel 4 (horn eller sonotrod), vilken genom sin indirekta mekaniska förbindelse med ultraljudskällan 2 är drivbar via matningsdelen 3 så att den ringformiga arbetsdelen utsättes för radiellt riktade ultraljudsvibrationer runt hela sin omkrets.The feed part 3 also determines the node point of the scales and is used in a conventional manner also for hanging the ultrasonic assembly 1 in a stand (not shown). The feed part 3 is thus mechanically connected to the ultrasonic source 2 at one end, and the opposite end of the feed part 3 is mechanically connected to a closed or annular working part 4 (horn or sonotrode), which by its indirect mechanical connection to the ultrasonic source 2 is drivable via the feed part 3 so that the annular working part is exposed to radially directed ultrasonic vibrations around its entire circumference.
Den föredragna utföringsform av arbetsdelen 4 enligt uppfinningen som visas i fig. 2 och 3 är ringformig med en sexhörnig arbetsyta 5, vilken emellertid även kan vara av annan, mer eller mindre mànghörnig form (t.ex. avrundat tre- eller fyrkantig), oval eller ha annan oregelbunden form. Beroende på frekvensen hos de av ultraljudskällan 2 alstrade ultraljudsvibrationerna ges arbetsdelen 4 en medelomkrets 6 (fig. 3) som svarar mot en ultraljudsvåglängd, d.v.s. en våglängd av ultraljudet “får plats” utmed medelomkretsen 6. Den aktuella längden är beroende av det material av vilket arbetsdelen 4 är tillverkad, men vid ett vanligen använt material, t.ex. titan, och med en ultraljudskälla av standardtyp som alstrar ultraljudsvibrationer med en frekvens av 20 kHz blir medeldiametern ca. 70 mm. Såväl utbredningen som amplituden hos ultraljudsvàgorna är således beroende av dels medelomkretsen 6, dels rotationssymmetrin hos den ringformiga arbetsdelen 4. Den ringformiga delen kan naturligtvis göras helt rotationssymmetrisk i de fall då arbetsytan skall vara cylindrisk, men vid en oregelbunden, t.ex. mànghörnig arbetsyta kommer oundvikligen rotationssymmetrin att störas. Förutsatt att symmetrin i övriga avseenden, t.ex. mellan arbetsdelens övre och undre halva (fig. 3, d.v.s. de båda på ömse sidor om ett av massfördelningen bestämt, i rät vinkel mot arbetsdelens centrumaxel anordnat massplan 7 belägna sektorerna a och b har lika stor radiell tvärsnittsarea) bibehålles har det visat sig att förekomsten av ett osymmetriskt, i massplanet 7 beläget flänsformigt utskott 8 (med förhållandevis liten massa) för bildande av den månghörniga arbetsytan 5 i praktiken e] stör vare sig ultraljudsvågornas utbredning eller amplitud. Givetvis minimeras utskottets 8 massa i möjligaste män, t.ex. genom att vid en mànghörnig arbetsyta tillse att arbetsytans 5 längst från arbetsdelens 4 10 15 20 25 30 35 511 004 centrumaxel belägna partier ("hörnen“) sammanfaller med arbetsdelens 4 inre, mot centrum vända ringformiga yta.The preferred embodiment of the working part 4 according to the invention shown in Figs. 2 and 3 is annular with a hexagonal working surface 5, which, however, can also be of another, more or less polygonal shape (eg rounded triangular or square), oval or have another irregular shape. Depending on the frequency of the ultrasonic vibrations generated by the ultrasonic source 2, the working part 4 is given an average circumference 6 (Fig. 3) which corresponds to an ultrasonic wavelength, i.e. a wavelength of the ultrasound "fits" along the mean circumference 6. The actual length depends on the material of which the working part 4 is made, but in the case of a commonly used material, e.g. titanium, and with a standard type ultrasonic source that generates ultrasonic vibrations with a frequency of 20 kHz, the average diameter becomes approx. 70 mm. Both the propagation and the amplitude of the ultrasonic waves are thus dependent on the mean circumference 6 and the rotational symmetry of the annular working part 4. The annular part can of course be made completely rotationally symmetrical in cases where the working surface is to be cylindrical, but in an irregular, e.g. polygonal work surface, the rotational symmetry will inevitably be disturbed. Provided that the symmetry in other respects, e.g. between the upper and lower halves of the working part (Fig. 3, i.e. the two sectors a and b located at right angles to the center axis of the working part arranged at right angles to the central axis of the working part have equal radial cross-sectional area), it has been found that the occurrence of an asymmetrical flange-shaped projection 8 (with a relatively small mass) located in the mass plane 7 for forming the polygonal working surface 5 in practice e] does not disturb the propagation or amplitude of the ultrasonic waves. Of course, the mass of the committee is minimized in the most possible men, e.g. by ensuring in the case of a polygonal working surface that the parts ("corners") located furthest from the center axis of the working part 4 coincide with the inner, annular surface of the working part 4 facing the center.
Tack vare den beskrivna, i huvudsak symmetriska uppbyggnaden av den ringformiga arbetsdelen 4 påverkas ultraljudsvågornas utbredning och amplitud således ej negativt av det faktum att arbetsytan är månghörnig. Det utskott 8 som uppbär arbetsytan 5 har en i förhållande till arbetsdelens 4 totala massa försumbar massa, vilken företrädesvis uppgår till endast ca. 2-6% av arbetsdelens 4 totala massa. Det har i praktiken visat sig att vågutbredningen i arbetsdelen 4 ej pâverkas negativt om utskottets 8 massa uppgår till mindre än ca. 10% av arbetsdelens 4 totala massa. Vid utskott som omfattar maximalt ca. 10% av arbetsdelens totala massa blir de störningar i vàgutbredningen som trots allt orsakas av osymmetrin försumbara. De påverkar därför i praktiken ej den ringformiga arbetsdelens svängningsnod. Då utskottets massa överstiger ca. 10% blir emellertid störningarna så stora att svängningsnoden påverkas, vilket leder till ojämn vågutbredning och därav följande ojämn eller helt utebliven svetsning.Due to the described, substantially symmetrical construction of the annular working part 4, the propagation and amplitude of the ultrasonic waves are thus not adversely affected by the fact that the working surface is polygonal. The projection 8 which supports the working surface 5 has a mass which is negligible in relation to the total mass of the working part 4, which preferably amounts to only approx. 2-6% of the total mass of the working part 4. It has been shown in practice that the wave propagation in the working part 4 is not adversely affected if the mass of the committee 8 amounts to less than approx. 10% of the total mass of the working part 4. In the case of committees that comprise a maximum of approx. 10% of the total mass of the working part, the disturbances in the wave propagation which, after all, are caused by the asymmetry become negligible. They therefore in practice do not affect the oscillation node of the annular working part. When the committee's mass exceeds approx. 10%, however, the disturbances become so large that the oscillation node is affected, which leads to uneven wave propagation and consequent uneven or no welding at all.
Företrädesvis är utformningen av arbetsdelen 4 symmetrisk kring massplanet 10, men det är även möjligt att tillåta viss osymmetri förutsatt att de båda sektorerna A och B är inbördes balanserade med avseende på massa och styvhet. Större massa i den ena sektorn kräver alltså att motsatt sektor har en mindre styvhet, vilken balanserar ut de annars ojämna svängningsrelationerna mellan de båda på ömse sidor om massplanet 6 belägna sektorerna. Det är även väsentligt att ultraljudskällans matningsdel 3 ansluter radiellt och i massplanet 6, eftersom i annat fall svängningsbalansen mellan de båda sektorerna förskjutes.Preferably, the design of the working part 4 is symmetrical about the mass plane 10, but it is also possible to allow some asymmetry provided that the two sectors A and B are mutually balanced with respect to mass and rigidity. Larger mass in one sector thus requires that the opposite sector has a smaller stiffness, which balances out the otherwise uneven oscillation relations between the two sectors located on either side of the mass plane 6. It is also essential that the feed part 3 of the ultrasonic source connects radially and in the mass plane 6, since otherwise the oscillation balance between the two sectors is shifted.
Till vänster i fig. 3 indikeras medelst punktstreckade linjer hur aggregatet enligt uppfinningen är avsett att användas för hopförsegling av delar till törpackningsbehållare, företrädesvis en sexhörnig manteldel i form av en hylsa 9 och en vid dennas ena ände belägen ändgavel 10. Såväl hylsan som ändgaveln är företrädesvis tillverkade av laminerat material innefattande t.ex. ett centralt skikt av fibermaterial, t.ex. papper, vilket på ömse sidor är belagt med värmeförseglingsbart material, t.ex. en termoplast såsom polyeten. I fig. 3 indikeras även hur ett mothåll 11 utnyttjas för att under hopförseglingen sammanpressa hylsans 9 ena ände och en uppvikt kant av ändgaveln 10 mellan mothållet och respektive arbetsdels 4 arbetsyta 7.On the left in Fig. 3 it is indicated by dashed lines how the assembly according to the invention is intended to be used for sealing parts of dry packing containers, preferably a hexagonal jacket part in the form of a sleeve 9 and an end end 10 located at one end thereof. Both the sleeve and the end end are preferably made of laminated material comprising e.g. a central layer of fibrous material, e.g. paper, which on both sides is coated with heat-sealable material, e.g. a thermoplastic such as polyethylene. Fig. 3 also indicates how an abutment 11 is used to compress one end of the sleeve 9 and a folded edge of the end end 10 between the abutment and the working surface 7 of the respective working part 4 during the sealing.
Vid drift av anordningen enligt uppfinningen placeras den ena änden av hylsan 9 i den ringformiga arbetsdelens 4 övre ände och med hylsändens utsida i kontakt med den mot arbetsdelens centrumaxel vända arbetsytan 5. Den vid hylsans 9 undre ände placerade ändgaveln 10 anpressas med sin uppvikta kant mot hylsans inre yta med hjälp av mothållet 11, vilket såsom visas i fig. 3 t.ex. kan vara svagt "konisk" och därmed åstadkomma önskad tryckkraft vid axiell förflyttning uppåt, vilket indikerats med pilen 12. Mothållet 11 kan även vara av någon annan känd typ, t.ex. expanderbart, och 10 15 20 511 004 innefatta ett antal tätt anordnade segment, vilka pressas radiellt utåt med hjälp av en lämplig kraftkälla, t.ex. pneumatik. När hylsan 9 och ändgaveln 10 således placerats i korrekt läge och i angränsande delar anpressats mot varandra med hjälp av mothållet aktiveras ultraljudskällan 2 så att axiella ultraljudssvängningar fortplantas och förstärkes via matningsdelen 3 samt överföres till och fördelas runt den ringformiga arbetsdelen 4. Eftersom den i massplanet 7 belägna medelomkretsen 6 har en längd som svarar mot en hel våglängd kommer den ringformiga arbetsdelen 4 i sin helhet att vibreraeller pulsera radiellt med tillräcklig amplitud för att uppvärma de mellan arbetsytan 5 och mothållet 11 belägna delarna av förpackningsbehållaren till sådan temperatur, att förpackningsmaterialets ytskikt av termoplast sammansmälter i anliggningsytan mellan hylsan 9 och ändgavelns 10 uppvikta kant. Efter önskad uppvärmningstid avbrytes tillförseln av ström till ultraljudskällan 2, varvid vibrationerna upphör och de smälta termoplastskiktens temperatur sjunker till dess att de sammansmälta skikten stelnar och bildar en vätsketät försegling mellan hylsans undre ände och ändgaveln. Härefter avlägsnas mothållet axiellt och förpackningsbehållardelarna kan gemensamt uttagas ur arbetsdelen 4.When operating the device according to the invention, one end of the sleeve 9 is placed in the upper end of the annular working part 4 and with the outside of the sleeve end in contact with the working surface 5 facing the central axis of the working part. The end end 10 placed at the lower end of the sleeve 9 is pressed with its folded edge towards the inner surface of the sleeve by means of the abutment 11, which as shown in Fig. 3 e.g. can be slightly "conical" and thus provide the desired compressive force during axial movement upwards, as indicated by the arrow 12. The abutment 11 can also be of some other known type, e.g. expandable, and comprise a number of tightly arranged segments, which are pressed radially outwards by means of a suitable power source, e.g. pneumatics. Thus, when the sleeve 9 and the end end 10 are placed in the correct position and in adjacent parts pressed against each other by means of the abutment, the ultrasonic source 2 is activated so that axial ultrasonic oscillations are propagated and amplified via the feed portion 3 and transmitted to and distributed around the annular working portion 4. 7 has a length corresponding to an entire wavelength, the annular working part 4 as a whole will vibrate or pulsate radially with sufficient amplitude to heat the parts of the packaging container located between the working surface 5 and the abutment 11 to such a temperature that the surface layer of the packaging material thermoplastic fuses in the abutment surface between the sleeve 9 and the folded edge of the end end 10. After the desired heating time, the supply of current to the ultrasonic source 2 is interrupted, whereby the vibrations cease and the temperature of the molten thermoplastic layers drops until the fused layers solidify and form a liquid-tight seal between the lower end of the sleeve and the end end. Thereafter, the abutment is removed axially and the packaging container parts can be jointly removed from the working part 4.
Genom att i enlighet med uppfinningen tillse att endast en ”försumbar” del av den ringformiga arbetsdelens 4 massa är osymmetriskt fördelad runt den i övrigt rotationssymmetriska, ringformiga arbetsdelen bibehålles den för ultraljudsvågornas utbredning viktiga symmetrin och balansen kring massplanet samt med bibehållen,optimal medelomkrets blir det således möjligt att försegla månghörniga föremål, vilket tidigare ej varit möjligt. Härigenom vidgas möjligheterna att använda ultraljudssvetsning utan att dyrbara eller opraktiska omkonstruktioner av vare sig ultraljudskällan eller arbetsdelen är nödvändiga.By ensuring in accordance with the invention that only a "negligible" part of the mass of the annular working part 4 is asymmetrically distributed around the otherwise rotationally symmetrical, annular working part, the symmetry important for the propagation of the ultrasonic waves and the balance around the mass plane are maintained. thus possible to seal polygonal objects, which has not been possible before. This expands the possibilities of using ultrasonic welding without costly or impractical reconstructions of either the ultrasonic source or the working part being necessary.
Claims (6)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9803091A SE511004C2 (en) | 1998-09-11 | 1998-09-11 | Ultrasonic assembly with annular working part which includes a flanged projection extending around the working part |
| JP2000569984A JP2002524253A (en) | 1998-09-11 | 1999-08-18 | Ultrasonic unit |
| PCT/SE1999/001392 WO2000015412A1 (en) | 1998-09-11 | 1999-08-18 | An ultrasound unit |
| AU63755/99A AU6375599A (en) | 1998-09-11 | 1999-08-18 | An ultrasound unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9803091A SE511004C2 (en) | 1998-09-11 | 1998-09-11 | Ultrasonic assembly with annular working part which includes a flanged projection extending around the working part |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE9803091D0 SE9803091D0 (en) | 1998-09-11 |
| SE9803091L SE9803091L (en) | 1999-07-19 |
| SE511004C2 true SE511004C2 (en) | 1999-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE9803091A SE511004C2 (en) | 1998-09-11 | 1998-09-11 | Ultrasonic assembly with annular working part which includes a flanged projection extending around the working part |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2002524253A (en) |
| AU (1) | AU6375599A (en) |
| SE (1) | SE511004C2 (en) |
| WO (1) | WO2000015412A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10256125B4 (en) * | 2002-11-29 | 2006-06-01 | Institut für Holztechnologie Dresden gGmbH | Method and apparatus for smoothing and compacting the surface of pencils or the like |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4074152A (en) * | 1974-09-30 | 1978-02-14 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Ultrasonic wave generator |
| FR2354827A1 (en) * | 1976-06-16 | 1978-01-13 | Mecasonic Sa | ULTRA-SOUND-PRODUCING DEVICE THAT CAN BE USED IN PARTICULAR IN THE THERMOPLASTIC MATERIALS INDUSTRY |
-
1998
- 1998-09-11 SE SE9803091A patent/SE511004C2/en not_active IP Right Cessation
-
1999
- 1999-08-18 JP JP2000569984A patent/JP2002524253A/en not_active Withdrawn
- 1999-08-18 WO PCT/SE1999/001392 patent/WO2000015412A1/en active Application Filing
- 1999-08-18 AU AU63755/99A patent/AU6375599A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| SE9803091D0 (en) | 1998-09-11 |
| WO2000015412A1 (en) | 2000-03-23 |
| SE9803091L (en) | 1999-07-19 |
| JP2002524253A (en) | 2002-08-06 |
| AU6375599A (en) | 2000-04-03 |
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