Ici Australia Limited

Other

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

USA As Represented by Secretary of the Navy

Donald George Keith

Anthony E Flecknoe-Brown

Robin S Murray

Anthony Flecknoe-Brown

A method for producing intaglio designs in cast acrylic material, wherein a moulding tool hotter than 600.degree. C. is applied to a surface contact area of an acrylic surface in which the intaglio copy of the moulding tool is to be formed, and the moulding tool is withdrawn from the surface contact area before the temperature of the tool or the acrylic material of said area falls below that at which methyl methacrylate vapor ceases to be produced by the depolymerization of the acrylic material. The preferred withdrawal temperature is above 250.degree. C.

Production of intaglio designs in cast acrylic

Reticulated products and their manufacture

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.

Stretch forming hollow articles

Method and apparatus for stretch-forming a hollow article from a sheet of thermoplastic material at a temperature higher than 25.degree. C. below the melting point wherein a stretching tool having at least one tip at a temperature lower than 50.degree. C. below the melting point is pressed against the sheet, and the initially stretched sheet is then further stretched and simultaneously dilated. One form of tool comprises a number of blades arranged around a plunger which are moved forward and outwardly after initially stretching the sheet forwardly. The articles so produced can be further formed by blow moulding.

Thermoplastic forming process

A slurry explosive composition which contains fibrous material as a rheology modifying agent.

Explosive composition and process with rheology modifying agent

A continuous process of forming a sheet of thermoplastic material by sequentially pressing against one face of the hot sheet of material the cold tips of projections set in and extending normally from a first series of separately moveable combs and sequentially pressing against the second face of the material the cold tips of projections set in and extending normally from a second series of separately moveable combs so that the projections of the first series of combs interpenetrate with the projections of the second series of combs in such a manner that the projections of the first series are spaced from the projections of the second series by a distance greater than the thickness of the sheet; and the interpenetrated projections are substantially parallel during the act of interpenetration; and wherein the interpenetrated combs are moved along at the speed of the sheet until the sheet is set and the combs are then removed and recycled.

Cuspated sheet forming

A process of cold drawing a shaped plastic sheet wherein said sheet has an array of substantially parallel rows of hollow pointed projections on one or both faces; said projections having at least a portion of the distal portion of the sides at an angle of over 60.degree. to the median plane of the sheet which process comprises cold drawing the shaped plastic sheet along an axis in the plane of the sheet normal to the rows of hollow projections.

Process of drawing a shaped plastic shoe having hollow pointed

Apparatus for deforming a sheet of thermoplastic material by sequentially pressing against one face of the hot sheet of material the cold tips of projections set in and extending normally from a first series of separately moveable combs and sequentially pressing against the second face of the material the cold tips of projections set in and extending normally from a second series of separately moveable combs so that the projections in the first series of combs interpenetrate with the projections on the second series of combs in such a manner that the projections of the first series are spaced from the projections of the second series by a distance greater than the thickness of the sheet; the interpenetrated projections are substantially parallel during the act of interpenetration; and the combs of any one series form a block pressing against the sheet of thermoplastic material, wherein the block so formed by the combs of any one series has two straight parallel sides, parallel with the sides of the thermoplastic sheet and has non-linear projections running across the block having a median normal to the parallel sides of the block said projections characterized in that an envelope around any one projection overlaps with the envelope around an adjacent projection; the combs each contain one or more complete projections; and wherein the interpenetrated combs are moved along at the speed of the sheet until the sheet is set and the combs are then removed and recycled.

Apparatus for deforming thermoplastic sheet

A process of manufacturing a cuspated sheet comprising deforming a sheet of hermoplastic material by pressing against one face of a molten sheet of the material the cold outer tips of a first array of pointed pins set in a first block and simultaneously pressing against the second face of the material the cold outer tips of a second array of projections set in a second block so that the arrays interpenetrate in such a manner that the projections on the second block are spaced from the projections of the first block by a distance greater than the thickness of the sheet and wherein the temperature of the cold outer tips of the arrays is less than the melting point of the thermoplastic material.

A laminate comprising a core consisting of a cuspated sheet consisting of a series of hollow projections projecting upwardly and downwardly from the median plane of said sheet and wherein the outer tips of the projections on the ends furthest from the median plane are closed and the ends of the projections in the median plane are open and wherein the projections form a series of pointed cusps said core laminated to a porous sheet wherein the points of the cusps on at least one face have been melted and at least partially allowed to impregnate the porous sheet.

Growing community of inventors

Mount Eliza, Australia

Donald George Keith