How to conduct a pre-shipment safety inspection

Mainly involves detecting hollowing, cracks, and peeling in the exterior wall plaster or finish layer. If there are potential peeling hazards in the exterior wall, a common detection method is to combine an infrared thermal imaging camera with a hollow hammer.

Infrared Thermal Imaging Principle: Primarily involves the collection and conversion of temperature signals (infrared light signals) emitted by the object being measured, with the painting mortar and wall tiles causing certain air layers to form. A sealed air layer possesses significant resistance, thus the thermal conductivity between the exterior wall surface and the main structure is relatively low.

Generally, when sunlight increases or temperatures rise, the temperature at hollow spots is higher than at other locations; conversely, when sunlight decreases or temperatures drop, the temperature at hollow spots is lower than at other locations.

Additionally, in cases where sunlight doesn't uniformly illuminate the wall, the unilluminated areas are factors affecting the accuracy of the detection. Such unilluminated walls require the use of traditional hammer-to-drum to assist in the inspection.