Cushioning material

Latex foam mbber was initially accepted as a desirable comfort-cushioning material because of its softness to the touch and its resiUence (equal to that of a steel spring alone but with better damping quaUties than the spring). 

Their Eperan beads have been used to produce molded articles as cushioning materials, sound iasulating panels, etc. Asahi-Dow and BASE have also been reported to have developed similar products. 

Today polyether foam with a density of less than half that of rubber latex foam is widely used as a cushioning material. Polyester foams, although tending to be more expensive, continue to have a number of outlets, particularly where a high initial modulus is desirable. In addition to miscellaneous upholstery applications... 

Polyurethanes. This material is available in three forms - rigid foam, flexible foam and elastomer. They are characterised by high strength and good chemical and abrasion resistance. The rigid foam is widely used as an insulation material, the flexible foam is an excellent cushion material for furniture and the elastomeric material is used in solid tyres and shock absorbers. 

Very popular is plastic cushioning material used in packaging, usually laminated thermoplastic films that incorporate air bubble pockets. 

M.E. Gigliotti, Design Criteria for Plastic Package-Cushioning Materials , PLASTEC Rept 4 (1961) 3)M.C. StCyr, State of the Art,... 

This comprises a copolymer containing 72 to 95 wt.% of ethylene and 28 to 5 wt.% of vinyl acetate and a small amount of organic composite having a bactericidal action contained therein, which is composed mainly of N,N-dimethyl-N -phenyl-N -(fluorodichloromethylthio)sulphamide, 1,2-benzisothiazoline-3-on, diiodomethyl-p-tolylsulphone and methyl(benzimidazol-2-yl)carbamate. It is suitable as cushioning material for floors and walls and as a material for building blocks and babies toys. 

Three methods for generating performance information relative to the shock absorbing ability of cushioning materials are discussed. Data are given for drop tests for PE foam. 6 refs. 

PUR Cushioning materials, packaging, padding (e.g., furniture, sound insulation panels, wood imitations, transportation) ... 

By crosslinking, the viscosity of EVA at high temperatures is increased and the individual cells are kept in a stable condition without rupture or agglomeration. A low density microcellular foam can be thus obtained. By selecting the vinyl acetate content, the EVA foam is flexible and highly resilient with easy coloring and adherent to other materials. The application is used widely in shoe soles, sandals and cushion materials. 

Use plenty of cushioning material to prevent glass bottles from breaking in transport. 

Cushioning All individual flexible cushioning materials used in seat cushions, mattresses, mattress pads, armrests, crash pads, and grab rail padding3-e ASTM D 3675 Is <25 ASTM E 662 Ds (1.5) < 100 ZX (4.0) < 175... 

ASTM F 1534 Standard Test Method for Determining Changes in Fire-Test-Response Characteristics of Cushioning Materials after Water Leaching... 

The annual U.S. production of TDI was 960 million lb in 1999. Most of the TDI is reacted with polyols to produce flexible polyurethane foams. These foams are widely used as cushioning materials in furniture, automobiles, carpets, and bedding. A small amount of TDI is used to make polyurethane coatings. Polyurethanes are discussed in detail in Chapter 15. 

Polyurethane Foam Polyester Fiber Products Urethane Chemistry Research Consulting Upholstery Cushion Materials Memory Foam... 

Polystyrene loose-fill packaging material used in US Federal Government applications must meet US Government Specification PPP-C-1683 (12/5/ 1988), Cushioning Material, Expanded Polystyrene Loose-Fill Bulk (for Packaging Application) . Compliance with eight properties is the basis for this... 

Applications of Fiexible Urethane Foams. Cushioning materials are the major applicatioii of flexible urethane foams. In 1980, the worldwide consumption of urethane foams was as follows (48) furniture and mattress applications, 37% and automotive applications, 18%. In addition to these applications, a wide variety of additional applications have been reported, including transportation, textiles, packaging, appliances, household materials, medical supplies, sound absorbents, sporting goods, cosmetics, agricultural applications such as artificial soil, and toys. 

Federal Specification PP-C-1797A, "Cushioning Material, Resilient, Low Density, Unicellular, Polypropylene Foam," 1 September 1982. This specification supersedes the earlier Military Specification M1L-C-81823(AS) (1971). 

In the early 1980 s a neoprene-type foam (VONAR) made by Du Pont was developed specifically for use as a comfort cushioning material for critical applications where low flammabUity was required, such as in transport aircraft seat cushions. This material is designed for use over flame-retardant polymethane foam and is believed to provide 50 seconds more of evacuation time in the event of a post-crash fire. VONAR has a density of 10.66 Ib/ft , compared to 7-8 Ib/ft for standard neoprene foam, and 1.2-2 Ib/ft for polyurethane foam (5). 

Polyether Cushioning Material, Foam-in-Place, Flexible(1991)... 

This is a new glossy trade magazine published bi-monthly by Edgell Communications, Inc, 7500 Old Oak Blvd, Qeveland, OH 44130. Editorial offices are at 1129 East 17th Avenue, Denver, CO 80218. The emphasis in this magazine is on Design, Manufacture and Performance, as indicated in the subtitle. Based on the subject area, it is quite likely that cellular plastic cushioning materials will be a topic of concern to be covered. 

MIL-HDBK-304 - Chapter 6 has a simple xocedure in which strips of cellular cushioning materials are wrapped around a cylinder or mandrel under standard conditions through a total angle of 180°. The specimens are then examined for failure, such as cracking, delamination, surface spalling, etc. 

---