Why do they put that plastic blue disk surrounded by the lid of softdrink bottles?

Look inside the screwtop lids on softdrinks! Why are they in attendance!

Answer:
That plastic blue disk is actually a food echelon quality rubber. Coco-cola first started using them within 1987 when they started to move away from the glass bottles, do you remember when soda come in the short squat cup bottles with the metal screw lid? Those had a wax coating on the inside to hang on to the bottles pressurized, meaning to hold the carbonation in. Wax didn't work as okay with the plastic lid and bottles that they have very soon, it was expensive and wasn't keeping the bottles hermetic. Rubber was introduced and bam! We very soon have little blue rubber disks on the inside of our bottles.
they are actually softer than plastic and they trademark the bottle so it is completely air tight
Dont ask that question. Big Brother is going to know that your onto them
I thought they acted like a 'gasket' of some sort.
cus they want to confuse you

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