主权项 |
1. A method of manufacturing a cushion, comprising:
providing a first sheet comprising a material selected from the group consisting of cross-linked foamed polyethylene (PE) and cross-linked foamed polypropylene (PP), wherein the first sheet has a foaming ratio of 3-30 and a thickness of 3-10 millimeters, wherein the first sheet functions as an outer layer of the cushion; forming a second sheet by performing the steps of crushing polyurethane (PU) foam, adding an adhesive to the crushed PU foam, and then compressing the crushed PU foam and the adhesive to form the second sheet, wherein the second sheet is a synthetic foam which functions as an intermediate layer of the cushion; providing a third sheet comprising a material selected from the group consisting of cross-linked foamed polyethylene (PE) and cross-linked foamed polypropylene (PP), wherein the third sheet has a foaming ratio of 3-30 and a thickness of 3-30 millimeters, wherein the third sheet functions as an inner layer of the cushion; laminating the outer layer, the intermediate layer and the inner layer to form a multi-layer structure; placing the multi-layer structure in an oven and heating the multi-layer structure to soften the inner layer and the outer layer; placing the heated multi-layer structure having softened inner and outer layers in a mold; pressing the heated multi-layer structure in the mold to form a shaped multi-layer structure, wherein the shaped multi-layer structure has a curvature suitable to support a user's waist, neck, back or head; and cooling the shaped multi-layer structure to form the cushion. |