Question

Which of the following adds rigidity to the cap in glass closure?

(a) Curl

(b) Face

(c) Lug

(d) Reverse

I had been asked this question in an interview for job.

Asked question is from Glass as Packaging Material in chapter Glass Packaging Materials of Food Packaging Technology

Answer 1

Right answer is (a) Curl

To elaborate: Curl adds rigidity to the cap in glass closure. It also protects the cut edge of the metal. Curl is the round or rolled portion at the bottom of the skirt. Lug is a horizontal inward protrusion from the curl that is seated under the thread on the glass finish and holds the cap in position. Face is the outside of the cap. Reverse is the inside of the cap.