ICPI 25th Anniversary Commemorative Publication ICPI 25th Anniv Commemorative Album 0219 web - Page 14

Multi-layer paver manufacturing equipment required careful attention to an exact moisture content in the concrete pavers. This was required because each layer of freshly molded pavers was stacked upon another every 15 to 20 seconds. The machine distributed a small amount of sand between each layer to prevent bonding to each other. By 1985, Unilock’s Barrie and Georgetown, Ontario, locations had several multi-layer machines and North America’s first single-layer board machine, a Dutch-made Mason. Moisture control in concrete pavers also was important, but not as critical with single-layer board machines. These machines Boards with freshly molded pavers are placed onto racks and rolled into curing chambers for 24 hours. The boards with cured pavers are removed and then stacked typically eight to ten layers high, then bound with straps and/or wrapped in plastic. molded one layer of 30 to 40 pavers onto a wooden or steel pallet every 10 to 15 seconds. Each board with pavers is stacked into a curing chamber for 24 hours to harden, then removed. The pavers on each board is removed and stacked then banded and/or wrapped in plastic packaged for shipment. Single-layer machines practically tripled production in an eight-hour shift compared to that from a multi-layer machine. Left: Fresh layers of pavers each molded on to a board emerging from a single layer machine 1 2 • I C P I C O M M E M O R AT I V E P U B L I C AT I O N