Graduate Thesis Or Dissertation
 

Analysis of adhesive atomization on composite bond performance

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s4655q024

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  • Spraying of liquid adhesive onto wood surfaces has shown to be a highly effective and efficient method of application across many different wood-based composite industries. However, the dynamics of spraying are extremely variable and distribution can be affected by liquid properties (rheology, molecular weight distribution, and temperature), application parameters (disk atomizers, spray nozzles, air-less, mixing, air pressure), and manufacturing equipment (blender design, nozzle configuration). There is a need for more insight into what defines an optimal droplet size, or size distribution, for a given product. The goal of this project was to establish guidelines for the atomization of resin for OSB manufacture. Phenol-formaldehyde resin distribution was studied to identify relationships between wood species, resin spot size, resin molecular weight, resin viscosity, and atomizer control. Atomization was created using a spinning disk system, where disk speed was a test parameter. Lap-shear and internal bond tests were used as a metric for the effectiveness of different resin distribution patterns created by the independent variables of resin molecular weight and disk speed. Aspen and southern pine strands were used. Digital image analysis and a scanning laser microscope were used to measure resin distribution parameters of spot size and surface coverage. In the process of making strand board using a spinning disk atomizer, resin distribution on strands is impacted by the disk speed of the atomizer and resin viscosity. In this study it was found that increasing atomizer speed decreases the size of resin spots detected on the strand surface. Furthermore, increasing viscosity by advancing polymerization increased resin spot size. Overall, smaller resin spot size, increased area coverage, and a continuous resin spot size distribution led to increased bondline performance.
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