Patent ID: 7285309

Claim:
A coating method by a wide slit nozzle comprising a slit as a discharge opening for a coated-type vibration damping material; the slit having a thickness along a coating direction of the coated-type vibration damping material and a width perpendicular to the coating direction, the thickness of the slit being smaller in dimension than the width of the slit so that the coated-type vibration damping material is coated while a size of the slit being set in a two-dimensional direction; the slit having a lateral center part and a pair of lateral end parts, the lateral center part having a fixed thickness or a thickness gradually decreasing toward its center, and each of the pair of the lateral end parts changing a thickness so that the thickness of the lateral end part decreases linearly from a corresponding lateral end of the lateral center part to a corresponding lateral end of the slit; the coating method comprising the step of: making the wide slit nozzle move along the coating direction and discharge the coated-type vibration damping materials from the slit by an airless coat method, while using the coated-type vibration damping material having a viscosity of 0.1 Pa·s/20° C. or more under a condition of a shear rate of 9400s −1 , so that a plurality of sheets of the coated-type vibration damping materials are mistlessly coated in an airless state and disposed in parallel on a surface of an object to be coated, while adjacent lateral end parts of the plurality of the parallel disposed sheets of the coated-type vibration damping materials being overlapped on each other thereby forming an overlapped portion at the adjacent lateral end parts, the overlapped portion being formed by at least a part of the coated-type vibration damping materials discharged from the lateral end part part of the slit, wherein, a total thickness at the overlapped portion at the adjacent lateral end parts of the plurality of the parallel disposed sheets of the coated-type vibration damping material becomes substantially equal to a thickness of the sheet of the coated-type vibration damping material discharged from the part lateral center part of the slit.