Patent ID: 9594256
Date: 2017-03-14
CPC Classifications: B29C,B29L,B32B,B41M,B44C,B44F,G02C,Y10T

Claim:
1. A method for preparing a thermoplastic laminate for an eyewear, wherein the thermoplastic laminate comprises an upper layer, a lower layer, and one or more core layers and optional one or more inner layers located between the upper layer and lower layer, and wherein the method comprises the steps of: 1) providing the thermoplastic upper layer and lower layer; 2) providing one or more core layers, which are selected from a pattern, an article and combinations thereof, located between the upper layer and lower layer; 3) optionally providing one or more thermoplastic inner layers between the upper layer and an adjacent core layer, the lower layer and an adjacent core layer, and/or two adjacent core layers; 4) bonding one or more core layers, the upper layer, the lower layer and the optional inner layers together by using a high frequency welding machine; and 5) obtaining the laminate, wherein the welding time of the high frequency welding machine is greater than about 15 seconds, wherein the electric current of the high frequency welding machine is greater than about 0.5 A but less than about 5 A, and wherein the cooling time of the high frequency welding machine used after bonding is greater than about 0.5 minutes.