Process for manufacturing laminated bath tub or shower tray
AssigneeArmitage Shanks Limited
InventorKeith M. Macdonald
Life of this patent
Estimating the term…
Abstract
A laminated article, for example a bath or shower-tray, is manufactured by providing a preformed shell, for example a thermoformed acrylic sheet, which shell is placed in a mould, together with, if required, a reinforcing board, for example of chipboard or plywood. The mould is then closed and materials are injected into the mould cavity which react to form a reinforcing layer on the shell. Preferably, the injected materials comprise a polyol reactant and an isocyanate reactant which form a layer of rigid polyurethane foam. A reinforcing agent, for example glass fibre, and a blowing agent may also be introduced into the mould cavity.
Claims13
A process for the manufacture of a laminated bath-tub or shower-tray, wherein a reinforcing layer of polyurethane is applied to a surface of an acrylic shell, which process essentially consists of the steps of producing a preformed shell of an acrylic material;
- inserting the said preformed shell into a matching, closable mould, which mould provides a space for a layer of reinforcing material;
- forming by a reaction injection moulding step a reinforcing layer of rigid polyurethane that adheres directly to the shell which step comprises injecting into the said mould space a mixture comprising a polyol material and an isocyanate material that react therein;
- and demoulding the resultant laminated article.
A process for the manufacture of a laminated bath-tub or shower-tray, wherein a reinforcing layer of polyurethane is applied to a surface of an acrylic shell, which process essentially consists of the steps of producing a preformed shell of an acrylic material;
- degreasing the said preformed shell;
- inserting the said degreased preformed shell into a matching, closable mould which mould provides a space for a layer of reinforcing material;
- forming by a reaction injection moulding step a reinforcing layer of rigid polyurethane that adheres directly to the shell, which step comprises injecting into the said mould space a mixture comprising a polyol material and an isocyanate material that react therein;
- and demoulding the resultant laminated article.
Dependencies are inferred from the claim text.