Patent ID: 6039909
Filing Date: 2000-03-21
Classification: B29D,G02B

Abstract:
A method for forming a retroreflective sheeting, comprising the steps of:a) providing a first light transparent thermoplastic polymer layer having a thickness in the range of about 0.003 to 0.022 inches;b) forming light transparent prism elements in a prism array on the first thermoplastic polymer layer, said prism elements being formed of a polymer material which is transparent and substantially inflexible at room temperature;c) applying a second thermoplastic layer to the prism array on a side of the array opposite the first layer; andd) welding the first thermoplastic layer to said second thermoplastic layer, while applying a die having a plurality of cells with multi-course, hatched patterned perimeters to said layers to dislocate a portion of the prism elements of the prism array, whereby the first thermoplastic layer bonds to the second thermoplastic layer at said portion, thereby forming the retroreflective sheeting.