| 摘要 |
A vacuum forming mold (10) has a plurality of dies (28) with at least one die being movable with respect to the other dies. The die can be movable in a linear direction or they can be movable in both a linear and angular direction. A plurality of plastic sheets (50) are heated and placed on a respective die with a vacuum being supplied through the dies via vacuum chambers (40) to attract the plastic sheet. Once formed, the dies (28) are moved together to create a seam bond between adjacent pieces of plastic sheets. If required, additional heating via heating means (34) can be supplied to insure an adequate seam bond. In another embodiment, a single sheet of material composed of a plurality of sheets of material is used. The single sheet of material has a plurality of preseamed areas connecting each of the individual plastic sheets. These preseamed areas are positioned inbetween adjacent dies and the process continues as described above for the multiple sheets of material. |
