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Controlling the Temperature of an Ultrasonic Converter Using Peltier Junctions

IP.com Disclosure Number: IPCOM000028560D
Publication Date: 2004-May-20
Document File: 5 page(s) / 101K

Publishing Venue

The IP.com Prior Art Database

Related People

Gregory Rajala: AUTHOR

Related Documents

US5667608: PATENT [+2]

Abstract

Peltier junction technology may be used to effectively cool ultrasonic converters. By replacing or augmenting conventional cooling technology based on the flow of air, Peltier junction cooling can provide improved temperature control and permit operation under conditions that may have been problematic for conventional ultrasonic systems. Many ultrasonic applications can be considered, including ultrasonic welding of thermoplastic components such as films and nonwoven webs, ultrasonic slitting, ultrasonic laminating, and so forth.

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Controlling the Temperature of an Ultrasonic Converter Using Peltier Junctions

    Gregory Rajala Kimberly-Clark Corporation Neenah, Wisconsin

Abstract Peltier junction technology may be used to effectively cool ultrasonic converters. By replacing or augmenting conventional cooling technology based on the flow of air, Peltier junction cooling can provide improved temperature control and permit operation under conditions that may have been problematic for conventional ultrasonic systems. Many ultrasonic applications can be considered, including ultrasonic welding of thermoplastic components such as films and nonwoven webs, ultrasonic slitting, ultrasonic laminating, and so forth.

Background: Ultrasonic Welding and Related Processes Ultrasonic welding is a widely used technology useful for joining two or more components together, particularly when thermoplastic material is present, though ultrasonic energy can also be used for welding metallic components and for soldering. In general, vibrational energy from an ultrasonic horn is directed to the welding zone, causing the thermoplastic material (or other materials) to fuse or deform to create a weld. A variety of welding types are known, including those listed at http://www.forwardtech.com/aboutultra.htm 1 such as near-field welds or far-field welds, and forms such as spot welding, staking, swaging, inserting. In the joining of woven fabrics, nonwoven fabrics, films, meshes, and the like, rotary horns or other moving horns (e.g., traversing horns, horns operating in plunge mode, etc.) may be used in continuous or semi- continuous processes. In such processes, a web passes between the ultrasonic horn and an opposing metal anvil, which may be a rotating drum having a pattern of raised areas. The ultrasonic energy is directed to the contact points between the drum and the raised areas of the anvil, fusing at least some of the thermoplastic material in the weld zone and creating patterned bonding. Exemplary principles for continuous operation are disclosed in "Ultrasonic Processing of Fabric and Film," Dukane Corporation Technical Bulletin, at http://www.dukcorp.com/us/ products/thermo/fabfilm/FFProcessGuide[Rev13E].pdf . Ultrasonic horns can also be used in batch operations. In addition to welding, stationary or moving ultrasonic horns can be used for slitting, laminating, embossing, perforating, etc.

Manufacturers and providers of ultrasonic welding equipment include Branson Ultrasonics Corporation (Danbury, Connecticut); Dukane Ultrasonics (St. Charles, Illinois); RDJ Ltd. (Knutsford, Cheshire, England-see http://www.rdj.co.uk/index.html ); and Chase Machine & Engineering, Inc. (West Warwick, Rhode island), including ultrasonic laminators, slitters, and their Rotary Wing Welder described at http://www.chasemachine.com/RotaryRingWelder NewsRelease.pdf .

Many products can be considered for ultrasonic welding or related ultrasonic processes. Examples include nonwoven laminates, products with...