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What is the preform before the formation of final glass jar called?

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in Food Packaging Technology by (63.0k points)
What is the preform before the formation of final glass jar called?

(a) Mold

(b) Gob

(c) Tube

(d) Parison

The question was posed to me in an interview for internship.

Query is from Manufacture of Glass topic in portion Glass Packaging Materials of Food Packaging Technology

1 Answer

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The correct answer is (d) Parison

To explain: The preform before the formation of final glass jar called parison or body blank.  A gob of glass, accurately sheared in terms of weight and shape, is delivered into an externally air cooled, cast iron mold from above to shape a preform.

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