Process for the production of industrial parts of synthetic material comprising a rigid portion surmounted by a flexible portion and the industrial part produced by said process
AssigneeLes Manufactures de Saint Marcel
InventorGiuliano Frau
Life of this patent
Estimating the term…
Abstract
The present invention concerns a process for the production of industrial parts of synthetic material comprising a portion of a rigid material surmounted by a portion of a flexible material, and in particular industrial parts serving as a means for making a seal between different parts of heating or air-conditioning equipment.
Claims10
Process for production of an industrial component which comprises a portion of rigid material partly surrounded by a portion of flexible material, including the steps of:
- making a model of said rigid portion;
- producing a first mould from said model;
- adding to the model additional material shaped and dimensioned to correspond to the shape and dimension of said flexible portion;
- producing a second mould from said model with said additional material thereon;
- placing said first mould in an injection moulding machine and injecting material to produce said rigid portion;
- removing said rigid portion from said first mould;
- inserting said rigid portion in said second mould;
- placing said second mould with said rigid portion inserted therein in a casting machine;
- and
- casting flexible material and uniting it to said rigid portion to produce said industrial component.
Process for production of a sealing shutter of a heating, or air-conditioning, system which comprises a rigid portion consisting of hinges and bearing members of the shutter and a flexible portion at least partially surmounting said rigid portion, comprising the steps of:
- making a model of said rigid portion;
- producing a first mould from said model;
- adding to said model additional material shaped and dimensioned to correspond to the shape and dimension of said flexible portion of said shutter;
- producing a second mould from said model with said additional material thereon;
- forming within said first mould by injection moulding said rigid portion of the shutter composed of a compact poly urethane with a density of the order of 1 g/cm.sup.3 ;
- removing said rigid portion from said first mould;
- inserting said rigid portion thus produced in said second mould and introducing into said second mould material to form therein at a temperature of about 40.degree. C. to about 50.degree. C. foamed polyurethane comprising about 60 to 80% of open cells and about 20 to 40% of closed cells, having a density of from about 0.2 to 0.6 g/cm.sup.3 and a surface hardness of from about 10.degree. to 30.degree. sh. A and which becomes united to said rigid portion of said shutter.
Dependencies are inferred from the claim text.