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IMPROVED DESIGN OF THE WELDING RIBS FOR THE ULTRASONIC PROCESS

IP.com Disclosure Number: IPCOM000007058D
Original Publication Date: 1993-Oct-01
Included in the Prior Art Database: 2002-Feb-21
Document File: 2 page(s) / 118K

Publishing Venue

Motorola

Related People

Andrew T. Guzik: AUTHOR [+3]

Abstract

This invention was developed for a portable radio application in which two plastic parts are bonded together by the ultrasonic welding process. The objec- tive was to provide a welding rib arrangement which would help achieve a monolithic and continuous weld joint, thus eliminating variation in melt volume, weld strength, and water-sealing capability.

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MOTOROLA INC. Technical Developments Volume 20 October 1993

IMPROVED DESIGN OF THE WELDING RIBS FOR THE ULTRASONIC PROCESS

by Andrew T. Guzik, Nestor F. Rivera and Todd W. Roshitsh

  This invention was developed for a portable radio application in which two plastic parts are bonded together by the ultrasonic welding process. The objec- tive was to provide a welding rib arrangement which would help achieve a monolithic and continuous weld joint, thus eliminating variation in melt volume, weld strength, and water-sealing capability.

  The major elements ofthis invention are shown in Figure 1 (with the base and cover shown as gen- eralized features). The plastic "base" 1 has dual receptacle ribs 2 around its periphery. The two ribs are separateed by a V-shaped channel 3. The plastic "cover" 4 has a single rib 5 around its periphery which aligns to the channel formed by dual ribs 2 on base 1.

  The weld-rib arrangement just prior to welding is shown in cross section in Figure 2. The cover 4 is placed on top of the base 1, with its single pro- truding rib 5 resting upon the channel 3 formed by

the dual ribs 2 on the base. The rib assembly is designed such that a weld "shear joint" exists on either side of the cover rib 5. This arrangement also helps to position the parts with respect to each other.

  When ultrasonic energy is distributed to the covert by the ultrasonic horn, the weld between properly aligned parts will be made equally on both sides of the V-shaped channel...