Combining, manufacturing process adhesive

Shaw selected a combination of polyolefin resins as the base polymer of choice for its substitute, EcoWorx . Due to the low toxicity of its feedstocks, superior adhesion properties, dimensional stability, and its ability to be recycled, EcoWorx meets all of the design criteria necessary to satisfy the needs of the marketplace from a performance, health, and environmental standpoint. Research also indicated that the post-consumer carpet tile had a positive economic value at the end of its useful life. The cost of collection, transportation, elutriation, and return to manufacturing processes is less than the cost of using virgin raw materials. This is a truly recyclable (or Cradle to Cradle) product and is a good example of how substitution through innovation can make economic as well as environmental sense. ... 

Fluoropolymers. These form one of our oldest and most spectacular families of engineering plastics. Polytetrafluoroethylene was developed by DuPont over two decades ago, and more recently by Allied Chemical, Hoechst, ICI, Pennwalt, and other manufacturers as well. It combines unusually low adhesion and friction, high temperature and flame resistance, excellent electrical properties, and extreme chemical inertness. Its high melting point and melt viscosity make thermoplastic processing extremely difficult, so that many... 

Nitrile polymers used for the manufacture of adhesives generally contain 25% or more acrylonitrile, but in the base polymer the acrylonitrile content can vary from 15% to 50%. Increasing the acrylonitrile content improves the oil and plasticizer resistance and increases the polarity of the compound. However, higher levels of acrylonitrile also increase the hardness and modulus of the polymer, reducing the elasticity of the resulting polymer. Nitrile rubber can be produced by a cold (5°C) or hot (25-50°C) process, with most adhesive polymers produced by the hot process which induces more chain branching. Nitriles can be combined with other monomers in solution polymerization which increases functionality and improves compatibility with other reactive resins like acrylics, epoxies, and polyurethanes. 

FIGURE 61.4 Manufacturing process for adhesive type laminate showing a polyimide-based film combined with an adhesive layer coat and laminated to copper foils. 

During the manufacture of bonded components with some adhesives it is necessary to apply them to the faying surfaces which are combined when the adhesive is substantially free of solvent, partially polymerized, or in some other intermediate state depending on the adhesive itself and on the process used. At this stage of combination, the adhesive is required to make an instantaneous bond which need not be of high strength but is required for placement purposes. The ability of the adhesive to make this bond arises from the property of tack which is a viscoelastic property. Pressure-sensitive adhesives used in tapes remain permanently tacky but structurally used adhesives lose... 

These failures are related to defects introduced in the bonded joint during the fabrication of a component, either as a result of a problem with the adhesive or the adherents or due to an inadequate manufacturing process. Fiber-metal hybrid laminates combine layers of metal with... 

Since the above has moved from a double-ply construction to a multi-ply lamination (the paper to foil may be an adhesive or extrusion coating), the latter is more costly to produce. As a result of this, any change to the new combination is only likely to be economical (how increase in cost of manufacture is counterbalanced by the reduction in material costs—i.e. savings on foil) if the thinnest gauge of foil acceptable is employed. What is acceptable depends on the product properties (is it extremely moisture or oxygen sensitive ) and the handling characteristics of the processing equipment. 

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