Abstract
Weld-lines are formed either by the direct impingement of two flowing fronts or by the rejoining of a melt stream previously separated by an obstacle, such as an insert. In both cases, the elongational flow field at the interface causes molecular orientation that is predominantly along, rather than across the weld region. In general, the presence of weld-lines reduces mechanical strength and affects surface appearance of the molded part. Although the reduction in strength of a part as the result of a weld-line is a widely recognized problem, a review of the literature reveals that there is very little fundamental understanding of the mechanism which accounts for the formation of a weld-line.
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© 1984 Plenum Press, New York
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Pisipati, R., Baird, D.G. (1984). Correlation of Non-Linear Rheological Properties of Polymer Melts With Weld-Line Strength. In: Astarita, G., Nicolais, L. (eds) Polymer Processing and Properties. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2781-3_21
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DOI: https://doi.org/10.1007/978-1-4613-2781-3_21
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