Abstract:
A structure is prepared by the spiral generation technique employing a flattened plastic tube which is inflated by means of internal fluid pressure and deposited in a generally helical manner. Adjacent turns of the helix are adhered to each other to provide a walled structure.
Abstract:
A lightweight plastics extruder is disclosed which can be used with particular benefit in the preparation of structures wherein a foamable plastic is extruded in a desired location and the extruder moved as foam material is deposited.
Abstract:
Walled structures are prepared of foam-in-place plastic material employing a depositing head having a pair of opposed side forming belts on top of the forming belts which are driven at a predetermined rate. Foamable material is passed to the channel formed by the belts as the depositing or foaming head progresses about the structure.
Abstract:
A lightweight plastics extruder is disclosed which can be used with particular benefit in the preparation of structures wherein a foamable plastic is extruded in a desired location and the extruder moved as foam material is deposited.