| 摘要 |
A method for producing laminated items, particularly for packaging and storing perishable and/or chemically aggressive substances, includes the following steps: a) preparing a mold that is shaped complementarily to the item to be produced; b) depositing, at least two superimposed layers of thermoplastic materials having chemical and physical characteristics that provide impermeableness to fluids, mechanical strength, resistance to chemicals on different levels, wherein one of the characteristics is predominant with respect to the others in one of the layers; c) welding the superimposed layers, on the surfaces that are mutually in contact, by simultaneous heating and compression; d) rapid cooling of the resulting item. Welding occurs at relatively low temperatures and pressures, so as to avoid substantially altering the chemical and physical properties of the basic materials of the individual layers. |
