Resin consumption

In addition to the surface area of the particles, several other parameters have some influence on the necessary resin consumption, e.g. the type of the boards, thickness of the sanding zone, type and capacity of the blenders, separation and spraying of the glue resin (only wiping effect or spraying of the resin by air or liquid pressure), shape of the panicles for the same particle sizes, dependence of... 

When investigating the suitability of a particular resin-bound separations process, the following factors are often important (i) resin consumption (ii) solvent usage (iii) productivity-chemical, optical and volume yields (iv) total number of separations steps and (v) capital costs. For any particular process, these factors differ in their relative importance. However, when evaluating a new separations method it is useful to examine each of these factors. The nonchromatographic separation method... 

Resin consumption is low because of the highly efficient use of the capacity of the resin for the enantiomer during each cycle, as well as the material stability of the resin. The above benefits of the ChiraLig M technology result in improved economics for the large-scale separation. 

In order to reduce the cooling level to the barrel zone, a metering valve was placed in the water line upstream of the solenoid valve as shown in Fig. 12.8(b). Now when the controller opens the solenoid valve, a much lower quantity of water and thus cooling is available to the barrel zone. Prior to this modification, the barrel temperatures oscillated 10 °C about the set point temperature. After the modification, the temperature oscillations were reduced to about 3 °C, and the profitability of the process was improved due to the minimization of resin consumption. 

An extrusion thermoforming operation was used to make large parts. In order for the process to be profitable, the process must be able to produce consistent, high-quality parts that have high strength with minimum resin consumption. Thus, the thermoforming process must be supplied with sheet stock that has a consistent... 

A direct relation between the polymer foams density (respectively, the expansion ratio) and the oligomer content in it has been established [114], Addition of water soluble polymers (polyvinyl alcohol, carboxymethyl cellulose, etc.) led to a reduction in resin consumption without deteriorating the quality of the solid foam obtained. Polymer foams of density 5-7 kg m3 were produced when the oligomer consumption was not more than 15-20% with respect to the solution volume. 

Resin consumption and cost. Resin deteriorates in use. Volume changes during adsorption and elution and mechanical wear cause breakage and attrition. Chemical poisoning and fouling cause gradual loss of adsorptive capacity. In three South African plants, useful resin life was estimated ([M3], p. 143) at from 19,000 to 27,000 volumes of solution treated per volume of resin. This represents about 3 years usage in normal service. 

The commodity thermosets of urea, melamine, and phenolics account for about one-third of building and construction industries resin consumption. Most of this is used for resin-bonded woods such as plywood, particle board, and oriented strand board. High-density polyethylene (HDPE), used primarily for rigid piping, accounts for about 5% of consumption. Other significant resins, accounting for 3-5% of total consumption, include other polyethylenes, unsaturated polyester, and polystyrene. 

Figure 9 Example of a particle size distribution, the calculated mass resin load (gluing factor), and the distribution of the resin solids content. The overall adhesive resin consumption was assumed to be 8% resin solids content/dry wood. (After ref 429.)... 

Figure 10 Particle size distribution and mass gluing factor of the individual particle size fractions for the separate gluing example CL+FL . The resin consumption was assumed to be 6.5% resin solids content/dry wood in the core layer (CL) and 11.0% in the face layer (FL). The mass proportions are CL FL = 60 40. (After ref. 429.)...

Besides the surface area of the particles several other parameters also have some influence on the necessary resin consumption, e.g., type of boards, thickness of the sanding... 

Moulding and core-making with chemically-bonded sand 4.3.3.1 Minimisation of binder and resin consumption... 

Adhesion promoters added to the mixture (so-called direct bonding systems such as resorcin-formaldehyde-silica), are advantageous because the dipping process is unnecessary. Disadvantages include the high resin consumption level and the potential elastomer property changes similar to the effects of mold release agents in the mixture [32]. 

The observed differences in penetration are also important in many types of wood-based panels, not only for bonding solid wood. Even two strands in oriented strand board (OSB) or two particles in a particleboard are bonded together via a bondline the only difference is the size of the bonding area. Penetration, however, is independent of the size of the bonding area. Particles from various wood species hence can show different influences on the penetration behavior of an applied adhesive, requiring different resin consumption for the same average bond strength. 

It could be presumed that in porous wood tissue an equal quality adhesive bonding could be achieved by higher resin consumption in comparison with les porous wood tissue. 

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