| 摘要 |
The method involves unwinding a plastic material film bobbin and subjecting a plastic material film (F) successively to a thermoforming operation for making a relief impression on a part of the film. The operation is performed at a temperature comprised between 80 and 90 degrees. The film is subjected to successive operations e.g. folding, for obtaining a bag having two walls in which one wall has the impression and for reuniting the walls and lateral edges with formation of blowers. The film is subjected to operations to constitute a bottom and to make an access opening with a closing unit. |
