DE9102187U1 - Ultrasonic welding device for web materials made of thermoplastics - Google Patents
Ultrasonic welding device for web materials made of thermoplasticsInfo
- Publication number
- DE9102187U1 DE9102187U1 DE9102187U DE9102187U DE9102187U1 DE 9102187 U1 DE9102187 U1 DE 9102187U1 DE 9102187 U DE9102187 U DE 9102187U DE 9102187 U DE9102187 U DE 9102187U DE 9102187 U1 DE9102187 U1 DE 9102187U1
- Authority
- DE
- Germany
- Prior art keywords
- sonotrode
- pressure roller
- pressure
- material layers
- web material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims description 36
- 238000003466 welding Methods 0.000 title claims description 33
- 229920001169 thermoplastic Polymers 0.000 title description 3
- 239000004416 thermosoftening plastic Substances 0.000 title description 2
- 238000005304 joining Methods 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 6
- 239000012815 thermoplastic material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 239000004033 plastic Substances 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- B29C66/83413—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
- 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
- B29C65/087—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 both a rotary sonotrode and a rotary anvil
-
- 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
- B29C66/43—Joining a relatively small portion of the surface of said articles
-
- 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
- B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
- B29C66/824—Actuating mechanisms
- B29C66/8242—Pneumatic or hydraulic drives
-
- 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
-
- 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
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/845—C-clamp type or sewing machine type
-
- 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
- B29C66/71—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 composition of the plastics material of the parts to be joined
-
- 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
- B29C66/7292—Textile or other fibrous material made from plastics coated
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
Die Erfindung betrifft eine kontinuierlich arbeitende Ultraschall-Schweißvorrichtung zur Verbindung von zumindest teilweise aus thermoplastischem Kunststoff bestehenden Bahnmaterialien mit einer Vorschubeinrichtung, welche die im Verbindungsbereich in Übereinanderlage gebrachten Bahnmaterial-Lagen kontinuierlich durch eine Schweißstation führt, in welcher eine die in einem Schallwandler erzeugte und dann über einen Booster übertragene Schallenergie in den Verbindungsbereich einleitende Sonotrode vorgesehen ist.The invention relates to a continuously operating ultrasonic welding device for joining web materials consisting at least partially of thermoplastic material with a feed device which continuously guides the web material layers placed one above the other in the joining area through a welding station in which a sonotrode is provided which introduces the sound energy generated in a sound transducer and then transmitted via a booster into the joining area.
Für die Verbindung von thermoplastischen Kunststoff-Teilen hat sich das Verfahren der Ultraschall-Schweißung in den letzten Jahren in zunehmendem Maße eingeführt. Insbesondere zum Verbindung von relativ starren Kunststoff-Formteilen entlang von in geeigneter Weise ausgebildeten Fügeflächen erbringt die Ultraschall-Schweißung belastbare und dichte Verbindungen bei wirtschaftlich günstigem Investitions- und Produktionsaufwand. Problematisch ist die Verbindung von biegeweichen Bahnmaterialien aus oder zumindest teilweise aus thermoplastischem Kunststoff, z.B. Folien, Vliesen, Folien-Laminaten, kunststoffbeschichteten Geweben usw. Bei der hierfür entwickelten Ultraschall-Nahtschweißmaschine der eingangs erwähnten Art werden die im Verbindungsbereich in Übereinanderlage gebrachten Bahnmaterialien durch Transportrollen kontinuierlich durch eine Schweißstation geführt, in welcher der in bei Ultraschall-Schweißmaschinen üblichen Weise ausgebildeten Sonotrode eine das ruhende Abstützwerkzeug oder den Amboß von Schweißmaschinen für Formteile ersetzende Abstützrolle vorgesehen ist, welche sich also beim Schweißvorgang mitdreht. Diese bekannte Ultraschall-Nahtschweißmaschine ist nur für gewisse Bahnmaterialien aus bestimmten Kunststoffen verwendbar, versagt dagegen oder erbringt keine voll zufriedenstellenden Verbindugnsnähte bei einer Vielzahl von bahnförmigen Kunststoffen, wie Folien aus PVC, Polyäthylen, Polypropylen,The ultrasonic welding process has been increasingly used in recent years to join thermoplastic parts. In particular, for joining relatively rigid plastic molded parts along suitably designed joining surfaces, ultrasonic welding produces resilient and tight connections with economically favorable investment and production costs. The connection of flexible web materials made of or at least partially made of thermoplastic plastic, e.g. films, fleeces, film laminates, plastic-coated fabrics, etc. is problematic. In the ultrasonic seam welding machine of the type mentioned at the beginning, which was developed for this purpose, the web materials placed one on top of the other in the joining area are continuously guided by transport rollers through a welding station in which the sonotrode, designed in the usual way for ultrasonic welding machines, is provided with a support roller that replaces the stationary support tool or the anvil of welding machines for molded parts, which therefore rotates during the welding process. This well-known ultrasonic seam welding machine can only be used for certain web materials made of certain plastics, but fails or does not produce fully satisfactory joining seams with a variety of web-shaped plastics, such as films made of PVC, polyethylene, polypropylene,
aber auch Vliesstoffe aus Kunststoffasern oder kunststoffbeschichtete Gewebebahnen, zurückgeführt wird dies darauf, daß die der Sonotrode zugewandte Lage der zu verbindenden Bahnmaterialien beim Schweißvorgang an der Arbeitsfläche der Sonotrode entlanggleitet. Das durch die einwirkende Schallenergie erweichende Kunststoffmaterial neigt dann zum Anhaften an der Sonotrode bzw. wird durch die unter Druckeinwirkung erfolgende Relativbewegung zwischen der Sonotrode und dem Kunststoffmaterial - teilweise - verdrängt und steht dann nicht für eine einwandfreie Verbindungsnaht zur Verfügung.but also nonwovens made of plastic fibers or plastic-coated fabric webs, this is attributed to the fact that the layer of the web materials to be joined facing the sonotrode slides along the working surface of the sonotrode during the welding process. The plastic material, which softens due to the acting sound energy, then tends to stick to the sonotrode or is - partially - displaced by the relative movement between the sonotrode and the plastic material under the influence of pressure and is then not available for a perfect connecting seam.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, eine kontinuierlich arbeitende Ultraschall-Schweißvorrichtung für zumindest teilweise aus thermoplastischem Kunststoff bestehenden Bahnmaterialien beliebiger Art zu entwickeln, welche einwandfrei feste und dichte Verbindungsnähte zu erzeugen vermag. Grundsätzlich soll die Schweißvorrichtung über die Erzeugung von geradlinigen Verbindungsnähten hinaus auch zur Herstellung von Kurven- oder Bogen-Schweißnähten geeignet sein.In contrast, the invention is based on the object of developing a continuously operating ultrasonic welding device for web materials of any type that consist at least partially of thermoplastic material, which is capable of producing perfectly strong and tight connecting seams. In principle, the welding device should be suitable for producing curved or arced welding seams in addition to producing straight connecting seams.
Ausgehend von einer Vorrichtung der eingangs erwähnten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, daß die langgestreckte Sonotrode eine im Durchmesser vergrößerte, im Querschnitt kreisförmig begrenzte, an der Oberfläche einer der zu verbindenden Bahnmaterial-Lagen in Anlage bringbare Umfangsfläche aufweist, welche die Sonotroden-Arbeitsfläche bildet, und um ihre parallel zur Verbindungsebene der Bahnmaterial-Lagen verlaufende Längsmittelachse motorisch drehantreibbar gelagert ist, und daß die Sonotrode so ausgebildet ist, daß die in Richtung ihrer Längsmittelachse eingeleitete Schallenergie im Bereich der Arbeitsfläche im wesentlichen radial gerichtet ist. Beim Schweißvorgang rollt die Arbeitsfläche der Sonotrode also auf der Oberfläche der sonotrodenzugewandten Lage der zu verbindenden Bahnmaterialien ab, d.h. es tritt kein merk-Starting from a device of the type mentioned at the beginning, this object is achieved according to the invention in that the elongated sonotrode has a circumferential surface which is enlarged in diameter, circular in cross-section and can be brought into contact with the surface of one of the web material layers to be connected, which forms the sonotrode working surface, and is mounted so as to be rotatable by a motor about its longitudinal central axis running parallel to the connecting plane of the web material layers, and that the sonotrode is designed in such a way that the sound energy introduced in the direction of its longitudinal central axis is directed essentially radially in the area of the working surface. During the welding process, the working surface of the sonotrode rolls on the surface of the layer of the web materials to be connected facing the sonotrode, i.e. there is no noticeable
liches relatives Gleiten zwischen der Sonotroden-Arbeitsflache und der Oberfläche des Bahnmaterials auf. Die bei der bekannten Schweißvorrichtung beobachteten Nachteile und Einschränkungen entfallen deshalb vollständig.relative sliding between the sonotrode working surface and the surface of the web material. The disadvantages and limitations observed with the known welding device are therefore completely eliminated.
In bevorzugter Weiterbildung der Erfindung ist die Ausgestaltung so getroffen, daß die Vorschub-Einrichtung von der drehangetriebenen Sonotrode einerseits und einer mit parallel zur Sonotroden-Längsmittelachse verlaufender Achse drehbar gelagerten Andrückrolle andererseits gebildet wird, deren die Andrückfläche bildende Umfangsfläche zur Sonotroden-Arbeitsflache ausgerichtet ist, und daß die Andrückrolle in einer Halterung gelagert ist, welche durch eine Zustell-Einrichtung radial in Richtung auf die Sonotroden-Längsmittelachse vorschieb- bzw. in entgegengesetzter Richtung zurückziehbar geführt ist. Über die Zustellmöglichkeit der Andrückrolle läßt sich also eine Einstellung auf unterschiedlich dicke Bahnmaterialien und die Wahl des geeigneten Arbeitsdrucks beim Schweißvorgang steuern. Die so ausgebildete Vorrichtung kann also als Ultraschall-Rollnahtschweißvorrichtung bezeichnet werden.In a preferred development of the invention, the design is such that the feed device is formed by the rotary-driven sonotrode on the one hand and a pressure roller on the other hand, which is rotatably mounted with an axis running parallel to the sonotrode's longitudinal center axis, the peripheral surface of which forming the pressure surface is aligned with the sonotrode's working surface, and that the pressure roller is mounted in a holder which is guided by a feed device so that it can be advanced radially in the direction of the sonotrode's longitudinal center axis or retracted in the opposite direction. The feed option of the pressure roller can therefore be used to control adjustment to web materials of different thicknesses and to select the appropriate working pressure during the welding process. The device designed in this way can therefore be referred to as an ultrasonic roll seam welding device.
Die Andrückrolle weist zweckmäßig ebenfalls einen Drehantrieb auf, welcher die Andrückrolle mit einer der Umfangsgeschwindigkeit der Sonotroden-Arbeitsflache entsprechenden Umfangsgeschwindigkeit ihrer Andrückfläche antreibt. Eine Relatiwerschiebung ,' der zu verbindenden Bahnmaterial-Lagen tritt dann - auch wenn die aufeinanderliegenden Oberflächen der Bahnmaterial-Lagen glatt und reibungsarm sind - nicht auf.The pressure roller also expediently has a rotary drive, which drives the pressure roller with a circumferential speed of its pressure surface that corresponds to the circumferential speed of the sonotrode working surface. A relative displacement of the web material layers to be joined then does not occur - even if the surfaces of the web material layers lying on top of one another are smooth and have little friction.
Besonders zweckmäßig ist eine Ausgestaltung der Vorrichtung derart, daß die Andrückrolle gegen Andrückrollen abweichender Breite und/oder Oberflächenprofilierung ihrer Andrückfläche austauschbar in der Halterung gelagert ist. Durch die Breite der Andrückfläche wird einerseits die Nahtbreite und somit die Festigkeit und Dichtheit der VerbindungsnahtIt is particularly useful to design the device in such a way that the pressure roller can be exchanged for pressure rollers of different width and/or surface profile of their pressure surface in the holder. The width of the pressure surface determines the width of the seam and thus the strength and tightness of the connecting seam.
bestimmt. Insbesondere bei Kurven-oder Bogenschweißungen ist es dagegen von Vorteil, wenn Andrückrollen geringerer Breite verwendet werden, da bei breiten Andrückflächen in den äußeren Randbereichen wieder relatives Gleiten zwischen der Andrückfläche - und somit der Sonotroden-Arbeitsfläche - und dem zu verbindenden Bahnmaterial auftreten kann, welches die geschilderten Fehlschweißungen zur Folge haben kann.Particularly in the case of curved or arc welding, it is advantageous to use pressure rollers with a smaller width, since with wide pressure surfaces in the outer edge areas, relative sliding can occur between the pressure surface - and thus the sonotrode working surface - and the web material to be joined, which can result in the described faulty welds.
Die Oberflächenprofilierung der Andrückrolle kann einerseits - bei glatten Bahnmaterialien - die Vorschubsicherheit erhöhen. Außerdem erzeugt die Oberflächenprofilierung eine entsprechend komplementäre Strukturierung der entstehenden Verbindungsnaht in der Oberseite der andrückrollenzugewandten Bahnmaterial-Lage. So kann z.B. durch geeignete Profilierung der Andrückrolle das Aussehen einer gesteppten oder mehrfach gesteppten Naht erzeugt werden.On the one hand, the surface profiling of the pressure roller can - with smooth web materials - increase the feed reliability. In addition, the surface profiling creates a correspondingly complementary structure of the resulting connecting seam in the upper side of the web material layer facing the pressure roller. For example, the appearance of a quilted or multi-stitched seam can be created by appropriately profiling the pressure roller.
Wenn Bahnmaterialien gleichzeitig miteinander verschweißt und im Bereich der Schweißnaht dann durchtrennt werden sollen, ist dies durch eine Ausgestaltung möglich, bei welcher die Andrückrolle im Bereich ihrer Andrückfläche mit einem umlaufenden rippenartigen Trennvorsprung versehen ist, dessen Durchmesser größer als der Durchmesser der Andrückfläche ist. Dabei ist der radiale Überstand des Trennvorsprungs über die Andrückfläche der Andrückrolle zweckmäßig kleiner als die Dicke der im Verbindungsbereich in Übereinanderlage befindlichen Bahnmaterial-Lagen gewählt. Der rippenartige Trennvorsprung dringt beim Schweißvorgang also in die zu verbindenden Bahnmaterial-Lagen ein und bildet so eine linienförmige Sollbruch-Trennaht, entlang derer die verbundenen Bahnmaterial-Lagen getrennt werden können. Wenn der rippenartige Trennvorsprung etwa mittig in der Andrückfläche der Andrückrolle angeordnet ist, entsteht also beidseitig des Trennvorsprungs in den zu verbindenden Bahnmaterial-Lagen jeweils ein streifenförmiger Verbindungsbereich, dessen Breite etwaIf web materials are to be welded together at the same time and then severed in the area of the weld seam, this is possible by a design in which the pressure roller is provided with a circumferential rib-like separating projection in the area of its pressing surface, the diameter of which is larger than the diameter of the pressing surface. The radial projection of the separating projection over the pressing surface of the pressure roller is expediently selected to be smaller than the thickness of the web material layers that are superimposed in the connection area. During the welding process, the rib-like separating projection penetrates into the web material layers to be connected and thus forms a linear predetermined breaking seam along which the connected web material layers can be separated. If the rib-like separating projection is arranged approximately in the middle of the pressing surface of the pressure roller, a strip-like connection area is created on both sides of the separating projection in the web material layers to be connected, the width of which is approximately
gleich der halben Breite der Andrückfläche der Andrückrolle ist. Andererseits ist es natürlich auch möglich, den Trennvorsprung an einer Seite der Andrückfläche anzuordnen, wobei dann in den zu verbindenden Bahnmaterial-Lagen eine streifenförmige Verbindungsnaht erzeugt wird, deren Breite etwa der Breite der Andrückrolle entspricht, während die durch den Trennvorsprung abgetrennten Bahnmaterial-Lagen unverbunden bleiben.is equal to half the width of the pressure surface of the pressure roller. On the other hand, it is of course also possible to arrange the separating projection on one side of the pressure surface, whereby a strip-shaped connecting seam is then created in the web material layers to be connected, the width of which corresponds approximately to the width of the pressure roller, while the web material layers separated by the separating projection remain unconnected.
Insbesondere dann, wenn sich die Vorschubgeschwindigkeit der zu verbindenden Bahnmaterialien während des Schweißvorgangs ändert - z.B. beim Kurven- oder Bogenschweißen - kann es zweckmäßig sein, wenn eine die Schweißenergie in Abhängigkeit von der Vorschubgeschwindigkeit der Bahnmaterial-Lagen im Verbindungsbereich ändernde Steuervorrichtung für den Schallwandler vorgesehen ist.In particular, if the feed rate of the web materials to be joined changes during the welding process - e.g. during curve or arc welding - it can be useful to provide a control device for the sound transducer that changes the welding energy depending on the feed rate of the web material layers in the joining area.
Die Erfindung ist in der folgenden Beschreibung eines Ausführungsbeispiels in Verbindung mit der Zeichnung näher erläutert, und zwar zeigt:The invention is explained in more detail in the following description of an embodiment in conjunction with the drawing, which shows:
Fig. 1 eine im Bereich der eigentlichen Arbeitsstation aufgebrochene schematisierte Seitenansicht einer in der erfindungsgemäßen Weise ausgebildeten Ultraschall-Schweißvorrichtung; undFig. 1 is a schematic side view, broken open in the area of the actual work station, of an ultrasonic welding device designed in the manner according to the invention; and
Fig. 2 eine Seitenansicht der Sonotrode der in Figur 1 gezeigten Vorrichtung.Fig. 2 is a side view of the sonotrode of the device shown in Figure 1.
Die in Figur 1 schematisch dargestellte, in ihrer Gesamtheit mit 10 bezeichnete Ultraschall-Schweißmaschine weist ein eine Arbeitstisch-Platte 12 tragendes Gestell 14 auf, in welchem - unterhalb der Platte 12 - eine von einem üblichen - z.B. mit Piezo-Elementen arbeitenden - Schallwandler über einen Booster (Verstärker) zu Längsschwingungen angeregte Sonotrode 16 (Fig. 2) angeordnet ist. Die Sonotrode ist in am Gestell 14 gehalterten Lagern 18 beidseitig einerThe ultrasonic welding machine shown schematically in Figure 1 and designated as a whole by 10 has a frame 14 supporting a work table plate 12 in which - beneath the plate 12 - a sonotrode 16 (Fig. 2) is arranged which is excited to longitudinal vibrations by a conventional sound transducer - e.g. working with piezo elements - via a booster (amplifier). The sonotrode is mounted in bearings 18 held on the frame 14 on both sides of a
im Durchmesser vergrößerten, koaxial zur Sonotroden-Längsmittelachse verlaufenden und eine zylindrische Arbeitsfläche bildenden Umfangsfläche drehbar gelagert und wird von einem drehzahlsteuerbaren Elektromotor 22 drehangetrieben.The device is rotatably mounted on a peripheral surface that is enlarged in diameter and runs coaxially to the sonotrode’s longitudinal central axis and forms a cylindrical working surface, and is driven in rotation by a speed-controlled electric motor 22.
Die Umfangs- oder Arbeitsfläche 20 tritt soweit in eine in der Arbeitstisch-Platte 12 vorgesehene Aussparung 24 ein, daß ihre höchste Mantellinie etwa bündig mit der Oberfläche der Arbeitstisch-Platte 12 verläuft bzw. nur geringfügig über diese Oberfläche vortritt. Der höchsten Mantellinie der zylindrischen Sonotroden-Arbeitsfläche 20 gegenüber ist in einem in senkrechter Richtung verschieblich gelagerten Antriebsschaft 28 eine Andrückrolle 2 6 um eine zur Sonotroden-Längsmittelachse parallele Achse drehbar gelagert. Der Andrückschaft 28 seinerseits ist durch eine, an seinem oberen Ende angreifende und am freien Ende eines mit Abstand oberhalb der Arbeitstisch-Platte 12 verlaufenden Kragarms 30 gehalterten, druckmittelbeaufschlagbaren Kolben-Zylinder-Einheit 32 in Richtung zur Sonotroden-Arbeitsfläche 20 zustellbar bzw. - durch entgegengesetzte Druckmittelbeaufschlagung-Von der Arbeitsfläche abhebbar.The peripheral or working surface 20 extends into a recess 24 provided in the work table plate 12 to such an extent that its highest surface line runs approximately flush with the surface of the work table plate 12 or only slightly protrudes above this surface. Opposite the highest surface line of the cylindrical sonotrode working surface 20, a pressure roller 26 is mounted in a drive shaft 28 that is displaceable in a vertical direction so that it can rotate about an axis parallel to the sonotrode's longitudinal center axis. The pressure shaft 28 in turn can be moved in the direction of the sonotrode working surface 20 by a piston-cylinder unit 32 which can be pressurized and is attached to its upper end and is held at the free end of a cantilever arm 30 which runs at a distance above the work table plate 12, or - by applying pressure in the opposite direction - can be lifted off the working surface.
Die Andrückrolle 26 ihrerseits kann zwangsläufig angetrieben sein, und zwar entweder durch eine geeignete, getrieblich-mechanische Koppelung mit dem auch die Sonotroden 16 antreibenden Elektromotor 22 oder durch einen gesonderten Elektromotor, der durch eine elektronische Steuerung mit dem Sonotroden-Antriebsmotor gekoppelt wird. In jedem Falle muß die mechanische oder elektronisch gesteuerte Koppelung des Drehantriebs der Sonotrode und der Andrückrolle so ausgelegt sein, daß die Umfangsgeschwindigkeit der Arbeitsfläche 20 der Sonotrode der Umfangsgeschwindigkeit der Andrückfläche der Andrückrolle entspricht, und zwar auch bei sich ändernder Arbeitsgeschwindigkeit. Änderungen der Arbeitsgeschwindigkeit können beispielsweise dann erforderlich werden, wenn bei der Verschweißung zweier Bahnmaterialien von einer geraden Rollennahtschweißung auf eineThe pressure roller 26 can in turn be driven by force, either by a suitable geared-mechanical coupling with the electric motor 22 that also drives the sonotrodes 16 or by a separate electric motor that is coupled to the sonotrode drive motor by an electronic control. In any case, the mechanical or electronically controlled coupling of the rotary drive of the sonotrode and the pressure roller must be designed so that the peripheral speed of the working surface 20 of the sonotrode corresponds to the peripheral speed of the pressure surface of the pressure roller, even when the working speed changes. Changes in the working speed can be necessary, for example, when welding two web materials from a straight roller seam weld to a
Kurven- oder Bogenschweißung übergegangen wird. Wenn angenommen wird, daß die Sonotroden-Arbeitsfläche 20 und die Andrückfläche der Andrückrolle 24 gleichen Durchmesser haben, muß die getriebliche Koppelung also mit einer Übersetzung von 1 : 1 erfolgen.Curve or arc welding is used. If it is assumed that the sonotrode working surface 20 and the pressure surface of the pressure roller 24 have the same diameter, the gear coupling must therefore be carried out with a ratio of 1:1.
Die elektrischen und/oder elektronischen Steuer- und Überwachungseinrichtungen für den Antrieb der Sonotrode der Andrückrolle einerseits sowie den Ultraschall-Wandler andererseits sind in einer in Figur 1 links unter der Arbeitstisch-Platte 12 angeordneten Steuereinheit 36 zusammengefaßt, welche an der Vorderseite die erforderlichen Einstellorgane und Anzeigegeräte aufweist.The electrical and/or electronic control and monitoring devices for driving the sonotrode of the pressure roller on the one hand and the ultrasonic transducer on the other hand are combined in a control unit 36 arranged on the left under the work table plate 12 in Figure 1, which has the necessary setting elements and display devices on the front.
Der Schweißvorgang selbst wird von der Bedienungsperson zweckmäßig mit einem - nicht dargestellten - elektrischen Fußschalter ausgelöst und gesteuert.The welding process itself is conveniently triggered and controlled by the operator using an electrical foot switch (not shown).
In Figur 2 ist die bei der beschriebenen Schweißvorrichtung verwendete Sonotrode 16 mit der von der Umfangsflache einer scheibenförmigen Vergrößerung gebildeten Arbeitsfläche 20 gezeigt. Durch geeignete Auslegung der im Innern mit einer Sackbohrung 38 versehenen Sonotrode erfolgt die Umsetzung der - in der Zeichnung von links - eingeleiteten Longitudinal-Schwingungen in die radiale Schwingungsrichtung im Bereich der Arbeitsfläche 20.Figure 2 shows the sonotrode 16 used in the welding device described with the working surface 20 formed by the peripheral surface of a disk-shaped enlargement. By suitably designing the sonotrode, which has a blind hole 38 on the inside, the longitudinal vibrations introduced - in the drawing from the left - are converted into the radial vibration direction in the area of the working surface 20.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9102187U DE9102187U1 (en) | 1991-02-25 | 1991-02-25 | Ultrasonic welding device for web materials made of thermoplastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9102187U DE9102187U1 (en) | 1991-02-25 | 1991-02-25 | Ultrasonic welding device for web materials made of thermoplastics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE9102187U1 true DE9102187U1 (en) | 1991-05-16 |
Family
ID=6864615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE9102187U Expired - Lifetime DE9102187U1 (en) | 1991-02-25 | 1991-02-25 | Ultrasonic welding device for web materials made of thermoplastics |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE9102187U1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4105013A1 (en) * | 1991-02-19 | 1992-08-20 | Branson Ultraschall | Continuous ultrasonic welding of e.g. plastics by cyclic weld pressure - with thick webs or delicate surface, giving seam of overlapping welds with min deformation and without tearing of pinholes |
| DE10261561A1 (en) * | 2002-12-20 | 2004-07-08 | Forschung + Entwicklung Klaus Dobernecker Ing. Grad. | Device for welding a cylindrical body such as a tube to a plate-shaped element such as heat dissipation strips by means of sound waves |
| WO2009156207A1 (en) * | 2008-06-27 | 2009-12-30 | Herrmann Ultraschalltechnik Gmbh & Co. Kg | Ultrasonic oscillating unit with holder |
| DE202010011706U1 (en) | 2010-08-23 | 2010-12-30 | Sonotronic Nagel Gmbh | Device for welding a tubular bag film |
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| DE1604733A1 (en) * | 1965-08-03 | 1971-01-14 | Shell Int Research | Method and device for ultrasonic welding of thermoplastic films |
| FR2507531A1 (en) * | 1981-06-12 | 1982-12-17 | Mecasonic Sa | Ultrasonically welding of hard, medium or soft thermoplastic films - using appts. having cylindrical head reciprocating axially on rod connected to oscillator |
| DE3525400A1 (en) * | 1984-12-03 | 1986-06-12 | Branson Ultrasonics Corp., Danbury, Conn. | METHOD AND DEVICE FOR ULTRASONIC WELDING AND ULTRASONIC CUTTING OF TEXTILE FILMS |
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|---|---|---|---|---|
| DE1604733A1 (en) * | 1965-08-03 | 1971-01-14 | Shell Int Research | Method and device for ultrasonic welding of thermoplastic films |
| FR2507531A1 (en) * | 1981-06-12 | 1982-12-17 | Mecasonic Sa | Ultrasonically welding of hard, medium or soft thermoplastic films - using appts. having cylindrical head reciprocating axially on rod connected to oscillator |
| DE3525400A1 (en) * | 1984-12-03 | 1986-06-12 | Branson Ultrasonics Corp., Danbury, Conn. | METHOD AND DEVICE FOR ULTRASONIC WELDING AND ULTRASONIC CUTTING OF TEXTILE FILMS |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4105013A1 (en) * | 1991-02-19 | 1992-08-20 | Branson Ultraschall | Continuous ultrasonic welding of e.g. plastics by cyclic weld pressure - with thick webs or delicate surface, giving seam of overlapping welds with min deformation and without tearing of pinholes |
| DE10261561A1 (en) * | 2002-12-20 | 2004-07-08 | Forschung + Entwicklung Klaus Dobernecker Ing. Grad. | Device for welding a cylindrical body such as a tube to a plate-shaped element such as heat dissipation strips by means of sound waves |
| WO2009156207A1 (en) * | 2008-06-27 | 2009-12-30 | Herrmann Ultraschalltechnik Gmbh & Co. Kg | Ultrasonic oscillating unit with holder |
| US8899295B2 (en) | 2008-06-27 | 2014-12-02 | Herrmann Ultraschalltechnik Gmbh & Co. Kg | Ultrasonic oscillating unit with holder |
| DE202010011706U1 (en) | 2010-08-23 | 2010-12-30 | Sonotronic Nagel Gmbh | Device for welding a tubular bag film |
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