Effects of Ice Blasting on Some Mechanical Properties of Composite Boards
Hamid Reza Taghiyari1* and Yousef Lotfinejad-Sani1
1Wood Science and Technology Department, Faculty of Civil Engineering,
Shahid Rajaee Teacher Training University, Lavizan, Shanbaloo St., Tehran, Iran
Ice-blast (frozen CO2, -78.5°C) is one of modern methods of cleaning for industrial purposes. Effects of ice-blasting were studied here on mechanical properties of plain and laminated medium-density fiberboards (MDF) and particleboard. Modulus of rupture (MOR) and modulus of elasticity (MOE) were measured and compared in accordance with the EN 312-4 standard values. Results showed that MOR and MOE of MDF specimens were significantly higher in comparison to those of the particleboard; the higher values were related to the more compression ratio between wood fibers in the MDF-matrix. Ice-blasting did not significantly affect MOR values; however, it significantly decreased MOE values in all treatments. Furthermore, ice-blasting had a negative abrading effect on the surface of both plain and laminated wood-composite boards. It was concluded that ice-blasting cannot be recommended for wood-composite materials as to its abrading effects on the surface of composite boards as well as its decreasing effects on some mechanical properties.
Ice blasting, or dry ice-blasting, is a form of abrasive blasting, where dry ice, the solid form of carbon dioxide, is accelerated in a pressurized air stream and directed at a surface in order to clean it (Taghiyari et al. 2012ab). The method is similar to other forms of abrasive blasting such as sand blasting, plastic bead blasting, or soda blasting but substitutes dry ice as the blasting medium (Taghiyari et al. 2012ab; Dong et al. 2013ab). Dry ice blasting leaves no chemical residue as dry ice sublimates at room temperature. The frigid temperature of the dry ice (109.3°F or -78.5°C) “blasting” against the material to be removed causes it to shrink and loose adhesion from its sub surface. Additionally, when some of dry ice penetrates through the material to be removed, it comes in contact with the underlying surface. The warmer sub surface causes the dry ice to convert back into carbon dioxide gas. The gas has 800 times greater volume and expands behind the material speeding up its removal. Paint, oil, grease, asphalt, tar, decals, soot, dirt, ink, resins, and adhesives are some of the materials removed by this procedure. Only the removed material must be disposed of, as the dry ice sublimes into the atmosphere.. . . . . . . . . .
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