A.a.r.c. (management) Pty. Limited

Hitek Limited

Anthony E Flecknoe-Brown

Donald George Keith

Wolfram E Bogwitz

Naum Duchovni

Forming thermoplastic web materials

Molten theromplastic web feeding process

Subsoil drain strip or sheet elements comprising a core surrounded by a polymer or glass fibre filter cloth. The core has a generally planar configuration with hollow formed-in flat topped projections on one or both sides which create internal volume for flow of water as well as supporting the filter cloth against imposed soil loads. The depth of the supporting projections on each side of the core and their relative spacing is to be such that the surrounding filter cloth is restrained against being forced into the hollow interiors of the projections so that adequate longitudinal flow of water can take place in the strip without the need for additional drainage tubes to be provided. The depth of the projections may be greater than one quarter of their closest spacing. Additionally, the average diameter of the projections may be between 0.2 and 0.35 of their closest spacing.

Drainage tube

A machine and process for continuously thermoforming molten thermoplastic sheet are provided requiring precise synchronism in the interaction between opposed successions of circulatable tooling steps. A single motor for all the driving mechanisms achieves the desired synchronism and a driven succession of tooling steps itself drives the opposed succession.

Thermoforming machine

Apparatus for stretch-forming a heat softened sheet of thermoplastics material. The apparatus includes a stretching tool and means to move the stretching tool relative to means holding the sheet so as to stretch the sheet in a preselected direction with the tool. The stretching tool includes a plurality of blades having edges for pressing against the sheet to stretch the sheet and a cam to move the blades transversely away from each other to stretch the sheet transversely of the preselected direction as the tool is moved to stretch the sheet in the preselected directions.

Growing community of inventors

Melbourne, Australia

Anthony E Flecknoe-Brown