How do they put the air in the bubble wrap?

How does the air get in the bubbles, do they inject it in or what?. But if they inject the air in won’t that leave a hole in it and cause the air to escape?

My mum just got some packages so there’s a lot of bubble wrap in the house so she said I can pop it but I’m feeling a little curious.

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Richard65 · M

It involves different resin beads being melted together to form a plastic sheet that is then fed onto a huge vacuum roller containing the bowl shaped indentations. As the sheet wraps over the vacuum roller it sucks the sheet into the indentations and the bubble is formed and then heat sealed.