It contains content and it almost always discarded after a while, and just is a toll for transferring letters. It has a history which back to 2000 BC, when Babylonians use tools for transferring their letters and then other people used animals skin for producing envelop. Here in the factory the at first use a sheeter machine to make the roll to the sheets of the paper to the certain size. Then using a cutter machine to cut the size of the envelop, the pieces called envelop blanket, then they lead to the machine and will fold and glue. Then they collect in other part.
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