Foam furniture molded around a rigid foam core
A foam seating article includes an outer layer of molded foam surrounding a solid inner core of molded foam or expanded polystyrene. The rigid foam of the inner core is made from polyurethane polyol and methylene diphenyl diisocyanate (MDI). The inner core has a hardness greater than 25 Shore A and a density less than two pounds per cubic foot. The polymer material of the solid core has a hardness that is greater than that of the outer foam. The outer layer of molded foam is high density (HD) foam, memory foam or latex foam. A fabric covering encloses the inner core and molded outer foam layer. The foam seating article can be a chair, stool, sofa, chaise lounge, bench or Ottoman. The seating article includes no wood or metal. Molding foam around a solid inner core is simpler and less costly than making conventional metal or wood framed furniture.
1. A seating article comprising:
a foam core made of molded foam having a hardness of greater than 25 Shore A;
an outer layer of foam molded completely around the foam core, wherein the outer layer of foam has hardness of less than 20 Shore A; and
a covering enclosing the outer layer of foam and the foam core.
2. The seating article of claim 1 , wherein the outer layer of foam is taken from the group consisting of: HD foam, memory foam and latex foam.
3. The seating article of claim 1 , wherein the covering is taken from the group consisting of: a woven fabric, a nonwoven fabric, leather, and a conformal plastic layer.
4. The seating article of claim 1 , wherein the molded foam of the foam core has a density of less than 1.5 pounds per cubic foot.
5. The seating article of claim 1 , wherein the foam core has an uneven outer surface, and wherein the outer layer of foam is molded into the uneven outer surface.
6. The seating article of claim 1 , further comprising:
a layer of memory foam glued on top of the outer layer of foam, wherein the covering encloses the layer of memory foam.
7. The seating article of claim 1 , wherein the seating article includes no wood or metal.
8. The seating article of claim 1 , wherein the foam core is made of a polyether-derived polyurethane polyol and methylene diphenyl diisocyanate.
9. The seating article of claim 8 , wherein the foam core contains between 100 kg and 120 kg of methylene diphenyl diisocyanate for every 100 kg of polyurethane polyol.
10. A seating article comprising:
a solid core made of a polymer material;
an outer layer of foam molded completely around the solid core, wherein the polymer material of the solid core has a hardness that is greater than that of the foam of the outer layer, and wherein a portion of the solid core forms a seat back around which the outer layer is conformally molded; and
a covering enclosing the outer layer of foam and the solid core.
11. The seating article of claim 10 , wherein the seating article includes no wood or metal.
12. The seating article of claim 10 , wherein the polymer material is expanded polystyrene.
13. The seating article of claim 12 , wherein the expanded polystyrene has a density of less than two pounds per cubic foot.
14. The seating article of claim 10 , wherein the polymer material is made of a polyether-derived polyurethane polyol and methylene diphenyl diisocyanate.
15. The seating article of claim 14 , the polymer material contains between 100 kg and 120 kg of MDI for every 100 kg of polyurethane polyol.
16. The seating article of claim 14 , wherein the polymer material has a hardness of greater than 25 Shore A and a density of less than 1.5 pounds per cubic foot.