Cushioning properties

Cellular mbber has been used extensively as shoe soles, where its combination of cushioning abiUty and wear resistance, coupled with desirable economics, has led to very wide acceptance. In this case the cushioning properties are of minor importance compared with the abrasion resistance and cost. Other significant cushioning appHcations for cellular mbbers and latex foam mbbers are as carpet underlay and as cushion padding ia athletic equipment. 

Most flexible foams produced are based on polyether polyols ca 8—10% (15—20% in Europe) of the total production is based on polyester polyols. Elexible polyether foams have excellent cushioning properties, are flexible over a wide range of temperatures, and can resist fatigue, aging, chemicals, and mold growth. Polyester-based foams are superior in resistance to dry cleaning and can be flame-bonded to textiles. 

Describes open cell foamed articles including silane-grafted single-site initiated polyolefin resins. The olefin polymer resin can be a polyethylene, a copolymer of ethylene, a C3-C20 alpha-olefin, or a copolymer of ethylene, a C3-20 alpha-olefin and a C4-C20 diene. The open cell foamed articles have good cushioning properties and can be non-allergenic. 

UNIQUE STRAND STRUCTURE PERMITS TAILORED CUSHIONING PROPERTIES... 

The foam sheet is clean, bright in appearance, has excellent cushioning properties, and is nonporous. The foam is extruded as a sheet and is subsequently vacuum thermoformed into the desired shapes for packaging, etc. (Chapters 5 and 7). Use includes low temperature insulation in freezers, coolers, and other types of refrigerated rooms auto, truck bodies, and railroad cars refrigerated pipelines and low-temperature storage tanks for liquefied natural gas. They find usage as a replacement for molded-paper-pulp board in meat and produce trays and egg cartons. 

Dual-Hardness Molded Foam A number of formulations for molded foams have been reported. A new development in recent years is dual-hardness molded foams. Automotive seats and furniture have been labor-intensive products. These products provide good comfort by using different layers of different hardnesses. Molded foams produced by using a single formulation have relatively comfortable cushioning properties in terms of sag factor. However, this advantage is not enough to satisfy customers requirements for comfort. 

Table 2 shows the properties of mat-like paving material using mill-ground and shredder-cut powdered rubbers. The mat-like paving materials have good cushioning property, skid resistance, water or vapor permeability, sound absorption and weatherability. 

Acid sulfite 1-2 Ca +, Mg + Na+, NH,+ 1. Chemical conversion to derivatives of cellulose (e.g., viscous rayon, cellulose acetate) 2. Filler pulps for paper requiring little strength (e.g., writing papers. Provides bulk, cushioning properties)... 

U.S./Canada Markets. Flexible foam will continue to dominate the polyurethane end uses. Its superior cushioning properties will maintain an almost 100% penetration of furniture and transportation markets. Furniture demand for flexible foam will follow consumer demand for upholstered furniture. Some steady growth is expected for bedding applications, but will probably not exceed 30% of the mattress units by 1990. 

The furniture and bedding industry use of polyurethane flexible foam for mattresses, pads, and cushioning is a fairly stable market. Furniture manufactured with polyurethane flexible foam offers excellent cushioning properties and reduced assembly labor. Polyurethane foam mattresses are an ideal use for flexible foam. 

Figure 6.31 Effect of different structural parameters on cushioning properties of warp-knitted spacer fabrics (a) spacer yam inclination (b) spacer yam diameter (c) fabric thickness and (d) outer layer structure (L, locknit Cl, chain plus inlay RM, smaU-size rhombic mesb HM, large-size hexagonal mesh).

Fig. 8. Dynamic cushioning properties of Mater-Bi molded foams. , Mater-Bi molded...

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