Disclosed is a method of producing a nonwoven material having improved resistance to penetration by particles. The method includes the steps of heating at least one nonwoven web containing meltblown thermoplastic polymer fibers to a temperature at which the peak total energy absorbed by the nonwoven...http://www.google.ca/patents/US5320891?utm_source=gb-gplus-sharePatent US5320891 - Particle barrier nonwoven material
