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Wide-mouth glass containers are formed by _______ process.

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in Food Packaging Technology by (63.0k points)
Wide-mouth glass containers are formed by _______ process.

(a) blow and press

(b) press and blow

(c) blow and blow

(d) press and press

The question was posed to me during an internship interview.

This is a very interesting question from Manufacture of Glass in division Glass Packaging Materials of Food Packaging Technology

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Right answer is (b) press and blow

To explain I would say: Wide-mouth glass containers (jars) are formed by press and blow process. In the case of jars, a two-step WMP&B process is used. The body blank or parison is formed by pressing the gob of molten glass against the mold walls with a large plunger. When the cavity is filled, glass is then pushed down into the neck ring and the finish is formed.

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