Meter-Mix Hardware for Fast-Cure Adhesive Systems Used in Lumber Gluing

Adhesive, systems used in the wood industry are becoming increasingly shorter in pot life, some being only 30 seconds. These adhesives require sophisticated meter-mix hardware. The hardware must meter the two adhesive components within tolerance limits of ?2 percent and not plug up during continuous operation or during the on-off cycles involved in many processes. Positive displacement pistons have been found to be the only satisfactory metering system suitable for production in mills. Static mixing heads and a specially designed chamber for bringing the two components into contact, combined with air-solvent flushing techniques, result in plug-free mixing. Air driven mechanical mixing heads are not satisfactory for pot lives under 15 minutes. The equipment may be automated as much as required to fit tully automated processes. A list of 20 recommendations on designing meter-mix equipment is included.

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