Mattresses and mattress toppers including knitted fabric and related methods
A mattress or mattress topper includes a cushioning element having an elastomeric material forming intersecting buckling walls that define hollow columns, and a knitted fabric disposed over the cushioning element and configured to move independently of the buckling walls. The elastomeric material includes an elastomeric polymer and a plasticizer. The knitted fabric includes a first layer of stretchable material; a second layer of stretchable material; and a layer of stretchable fill material between the first layer of stretchable material and the second layer of stretchable material. The first layer of stretchable material is knitted together with the second layer of stretchable material as a unitary sheet of fabric including the layer of stretchable fill material. A method of forming a mattress or mattress topper includes disposing a knitted fabric over a cushioning element comprising intersecting buckling walls and configuring the knitted fabric to move independently of the buckling walls.
1. A mattress or mattress topper, comprising:
a cushioning element comprising an elastomeric material forming a plurality of intersecting buckling walls defining a plurality of hollow columns, wherein the elastomeric material comprises an elastomeric polymer and a plasticizer; and
a knitted fabric fitted to and secured in place over the cushioning element while being freely laterally movable with respect to adjacent surfaces of the cushioning element, the knitted fabric comprising:
a first layer of stretchable material;
a second layer of stretchable material; and
a stretchable fill material between the first layer of stretchable material and the second layer of stretchable material;
wherein the first layer of stretchable material and the second layer of stretchable material are knitted together at laterally spaced apart locations to provide a unitary fabric, with attached locations of the unitary fabric being located at the laterally spaced apart locations and detached locations of the unitary fabric being located between adjacent attached locations, knitting of the attached locations encapsulating the stretchable fill material in the detached locations, each attached location comprising a location where a first thread of the first layer extends to the second layer to form at least a portion of the second layer and where a second thread of the second layer extends to the first layer to form at least a portion of the first layer, each detached location comprising a location where the stretchable fill material spaces the first layer and the second layer apart from each other.
2. The mattress or mattress topper of claim 1 , wherein the knitted fabric comprises a material having a weight per unit area of at least about 250 g/m 2 .
3. The mattress or mattress topper of claim 2 , wherein the knitted fabric comprises a material having a weight per unit area of at least about 400 g/m 2 .
4. The mattress or mattress topper of claim 1 , wherein the knitted fabric comprises a material having a bulk thickness of at least about 2.5 mm.
5. The mattress or mattress topper of claim 4 , wherein the knitted fabric comprises a material having a bulk thickness of at least about 5.0 mm.
6. The mattress or mattress topper of claim 1 , wherein the knitted fabric exhibits stretchiness in at least two directions perpendicular to one another.
7. The mattress or mattress topper of claim 1 , wherein the knitted fabric consists essentially of materials exhibiting stretchiness in at least two directions perpendicular to one another.
8. The mattress or mattress topper of claim 1 , wherein the knitted fabric comprises at least about 3% elastomeric fiber by weight.
9. The mattress or mattress topper of claim 1 , wherein the knitted fabric is in direct contact with the cushioning element.
10. The mattress or mattress topper of claim 1 , further comprising a flame-retardant fabric between the knitted fabric and the cushioning element.
11. The mattress or mattress topper of claim 1 , wherein the knitted fabric is integrated into a removable cover removable from the cushioning element.
12. The mattress or mattress topper of claim 1 , wherein the elastomeric material comprises elastomeric gel.
13. The mattress or mattress topper of claim 1 , wherein a ratio of a weight of the plasticizer to a weight of the elastomeric polymer is from about 0.1 to about 50.
14. The mattress or mattress topper of claim 1 , wherein the elastomeric polymer comprises an A-B-A triblock copolymer.
15. A method of forming a mattress or mattress topper, comprising:
knitting a fabric to form a first stretchable layer and a second stretchable layer, with a fill material between the first stretchable layer and the second stretchable layer, the first stretchable layer, the second stretchable layer, and the fill material defining a unitary fabric including attached locations where the first layer of stretchable material and the second layer of stretchable material are knitted together and detached locations between adjacent thinner sections, knitting of the attached locations encapsulating the layer of stretchable fill material in the detached locations, each attached location comprising a location where a first thread of the first stretchable layer extends to the second stretchable layer to form at least a portion of the second stretchable layer and where a second thread of the second stretchable layer extends to the first stretchable layer to form at least a portion of the first stretchable layer, each detached location comprising a location where the first stretchable layer and the second stretchable layer are spaced apart from one another;
defining a fitted cover for a cushioning element comprising an elastomeric material forming intersecting buckling walls that define a plurality of hollow columns, the elastomeric material comprising an elastomeric polymer and a plasticizer from the fabric; and
securing the fitted cover in place over the cushioning element in a manner that enables the cover to freely move laterally with respect to surfaces of the cushioning element.
16. The method of claim 15 , wherein securing the fitted cover in place over the cushioning element comprises securing the fitted cover in place with the fabric comprising a material exhibiting stretchiness in at least two directions perpendicular to one another.
17. The method of claim 15 , wherein securing the fitted cover in place over the cushioning element comprises positioning the fitted cover such that the fabric entirely covers a top surface of the cushioning element and at least partially covers a side surface of the cushioning element.
18. The mattress or mattress topper of claim 1 , wherein the knitted fabric stretches in at least two perpendicular directions in a plane of a surface of the knitted fabric.
19. The mattress or mattress topper of claim 18 , wherein the knitted fabric stretches in a third direction perpendicular to the plane of the surface of the knitted fabric.
20. The method of claim 16 , wherein securing the fitted cover in place comprises securing the fitted cover in place with the fabric comprising a material exhibiting stretchiness in a third direction perpendicular to the plane of the surface of the knitted fabric.
21. A mattress or mattress topper, comprising:
a cushioning element comprising an elastomeric material forming a plurality of intersecting buckling walls defining a plurality of hollow columns; and
a fitted cover encasing the cushioning element while being freely laterally movable with respect to surfaces of the cushioning element, the fitted cover comprising a knitted fabric comprising:
a first stretchable layer;
a second stretchable layer superimposed with the first stretchable layer, the first stretchable layer and the second stretchable layer including:
attached locations where the first stretchable layer and the second stretchable layer are integrally knit together to provide a unitary fabric, the attached locations comprising thinner sections of the unitary fabric, each thinner section including a first thread of the first stretchable layer extending to the second stretchable layer to form at least a portion of the second stretchable layer and a second thread of the second stretchable layer extending to the first stretchable layer to form at least a portion of the first stretchable layer; and
detached locations between laterally adjacent attached locations, where the first stretchable layer and the second stretchable layer can be spaced apart from each other, and comprising thicker sections of the unitary fabric; and
a fill material between the first stretchable layer and the second stretchable layer in the detached locations and spacing the first stretchable layer apart from the second stretchable layer at the detached locations.
22. The mattress or mattress topper of claim 21 , wherein the knitted fabric exhibits stretchiness in at least two directions perpendicular to one another.
23. The mattress or mattress topper of claim 21 , wherein the fitted cover includes a top side and four lateral sides comprising the kitted fabric fitted to and positioned respectively over a top surface and four lateral surfaces of the cushioning element.
24. The mattress or mattress topper of claim 21 , wherein the fill material is encapsulated by the first stretchable layer and the second stretchable layer.