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Surface mount adhesive: in search of a perfect dot

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Abstract

Surface mount adhesives are used to hold electronic components on printed circuit boards or substrates. When dispensed onto a surface, the adhesive dots have to meet distinctive geometric requirements, such as dot diameter and height. The present paper provides an insight into how the manipulation of three key components in the formulation of a surface mount adhesive can affect the characteristics of the dispensed dot. In the search for a formulation that yields perfect dots, the rheological and time-pressure dispensing characteristics of 12 adhesive samples of different formulations based on a mixture design were investigated. All formulations were subject to viscosity and dispensing tests. From the test results, the adhesive samples were found to be shear thinning and thixotropic. The break-up length, dot diameter and volume were found to decrease with increasing viscosity, while the dot height showed otherwise. From the regression of data, most of the responses can be correlated with a linear model to the composition of the adhesive samples. Increasing component C 3 has a significant positive effect on the viscosity, break-up length, dot diameter and volume compared to component C 2, while increasing component C 1 has a negative effect on the responses. The adhesive sample, which was found to approach ‘perfection’, has the formulation of C 1 = 0.6, C 2 = 0.32, and C 3 = 0.08. This finding agrees with the optimal formulation calculated by the optimization of the responses.

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Authors and Affiliations

  1. Chemical Engineering Department, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia

    Beng Leong Toh, Hak Koon Yeoh & Wen Hui Teoh

  2. Asahi Chemical Research Lab (M) Sdn Bhd, 32 Hala Rapat Baru 24, Kawasan Perindustrian Ringan Kinta Jaya, 31350, Ipoh, Perak, Malaysia

    Loy Chee Chin

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  1. Beng Leong Toh
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  2. Hak Koon Yeoh
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  3. Wen Hui Teoh
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  4. Loy Chee Chin
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Correspondence to Wen Hui Teoh.

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Toh, B.L., Yeoh, H.K., Teoh, W.H. et al. Surface mount adhesive: in search of a perfect dot. Int J Adv Manuf Technol 90, 2083–2094 (2017). https://doi.org/10.1007/s00170-016-9549-5

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  • DOI: https://doi.org/10.1007/s00170-016-9549-5

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