| 摘要 |
Structurally strong articles are formed from inherently weak materials, such as expanded polystyrene, coated with one or more layers of a thermoplastic sheet material, such as amorphous polyethylene terephthalate. The inherently weak interior members are either fluid permeable or perforated. These members are sandwiched or encapsulated by heat deformable outer layers. The articles are made by applying a fluid pressure between the stack of interior members and the thermoplastic sheet, with the thermoplastic sheet heated to conform to the interior members. The fluid pressure is maintained until the thermoplastic sheet is cooled so that tension extending in all directions is produced in the sheet. The resulting articles are useful as building elements, signs, motor vehicle panels, pallets, surf boards, and sail boards. |
