The figure gives polymer-extrusion product sections P,Q and available die openings 1–4. Which mapping most likely matches products to dies? Sections are perpendicular to extrusion; drawings are not to scale.
Polymer melts swell on leaving the die because elastic recovery increases transverse dimensions and can alter the contour. A circular opening 1 gives circular product P. A square product Q is obtained by compensating for nonuniform die swell with the shaped opening 4, rather than assuming the opening must already be square. Thus **P–1, Q–4: A**.
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