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______ is the spiral groove on the closure.

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in Food Packaging Technology by (63.0k points)
______ is the spiral groove on the closure.

(a) Face

(b) Skirt

(c) Panel

(d) Thread

This question was posed to me in unit test.

Question is from Glass as Packaging Material in section Glass Packaging Materials of Food Packaging Technology

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The correct option is (d) Thread

The best I can explain: Thread is the spiral groove on the skirt of a continuous thread closure that meshes with the tread on the glass finish. Face is the outside of the cap. Panel is the flat center area in the top of the closure. Skirt is the flat, almost vertical portion on the side of the closure, which serves as the gripping surface and may be smooth, knurled or fluted.

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