Thermal Analysis
Change in the physical dimensions of a sample is monitored as a function of temperature using non-invasive imaging techniques. The method known as optical dilatometry is used to observe how coatings and fibres behave during the high heat cycles of drying or curing. It provides a visual record of expansion and contraction.
Mechanical Behaviour
A digital camera captures the silhouette of a sample while it sits inside a furnace or under an infrared lamp. Specialized software tracks the edges to measure the coefficient of thermal expansion without the friction of a mechanical push-rod. Optical dilatometry is particularly useful for measuring the softening point of waxes or the sintering of mineral coatings.
It reveals the exact temperature where a material starts to lose its structural integrity.
Barrier Integration
Packaging engineers use these measurements to ensure that multi-layer structures do not delaminate when heated. If the paper base and the polymer coating expand at different rates, the bond may fail. Data from optical dilatometry guides the selection of adhesives that can absorb this internal stress.
It helps in the design of ovenable trays and microwaveable packaging. High precision in these measurements prevents the cracking of barrier layers that would otherwise compromise food safety.
