LASD in PAINT SHOP

Liquid sound deadener (LASD) is now replacing the traditional acoustic damping pads. Water-based LASD is the modern alternative to traditional bitumen mats with significant weight savings.This new material saves weight, reduces costs and stocks along the assembly line. Moreover, utilising a robot gives the flexibility to adapt the dispensed size and thickness of each application, according to the car model and reduce weight. The robotic process allows the pattern to be easily changed to increase the performance of dampening as needed.

Requests from OEMs to have a lower density and more environment friendly material, has seen the LASD manufacturers create a waterborne acrylic material. Achieving 50% of mass reduction compared to pads, this material is also compatible with the energy saving, lower bake temperatures now to used cure car bodies. The challenge in using this new material relates to the pumping and dosing equipment because of its higher viscosity and abrasiveness. Using these wetted materials requires the pumps, regulators and shot meter chambers to be made of high grade of stainless steel, such as those made by Sames. For aluminum car bodies, the vibration modes are shifted to a high frequency (over 300Hz) compared to steel car bodies. The material manufacturers are adapting the chemicals, and the application process needs an accurate dosing process to deliver the most effective dampening performance, with the right thickness and position of the material on the plates.The LASD robotic cell apply on the floor surface of car bodies. 

The LASD dampen dramatically noise and vibration of structure panel, for a better comfort of passenger.