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Thermoplastic Web Ultrasonic Welding Apparatus

IP.com Disclosure Number: IPCOM000095183D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

Ultrasonic energy can be used for joining thermoplastic films. Apparatus utilizing optimum design of the horn and anvil so that they couple and resonate together are shown. In apparatus where the anvil couples with the horn when a load is applied to the horn against the anvil, the horn is not dampened out, as normally happens, but is reinforced by the anvil resonating with the horn.

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Thermoplastic Web Ultrasonic Welding Apparatus

Ultrasonic energy can be used for joining thermoplastic films. Apparatus utilizing optimum design of the horn and anvil so that they couple and resonate together are shown. In apparatus where the anvil couples with the horn when a load is applied to the horn against the anvil, the horn is not dampened out, as normally happens, but is reinforced by the anvil resonating with the horn.

As shown, coupling can be accomplished by designing the horn with dimensions that are a fraction of the ultrasonic transducer wavelength to couple the horn and the anvil. The anvil can be designed to resonate when coupled with the horn to reinforce the normal frequency transmitted from the horn or subharmonics or harmonics of the normal frequency. The symbol lambda represents the wavelength of the transducer.

This coupling effect can be used with combinations of gain horns and gain anvils, no gain horns and no gain anvils, or gain horns and no gain anvils. The coupled anvil can either be supported at the zero node region or can be moved in unison with the horn or can be stationary and have the horn transverse its length.

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