How Transparent Glasses are manufactured?

I used to get some sort of crazy solutions to common questions like how to make a glass, how video signal comes into television etc when I was 8 or 9. One of them is how to manufacture the glass.
My theory:

1. Stretch a big polythene sheet (transparent one used for packing)
2. Pour water uniformly
3. Cover with another big polythene sheet
4. Freeze it and seal the ends.

Supportive statements:

1. As the ends are sealed, the ice inside wont melt. (sorry I didn't know the concept of heat conduction in that age)

This theory of mine got shattered when I saw broken glass pieces during a car accident. None of them melted after they broke :-(

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