Lamination is essentially marrying two or more layers of materials together to obtain superior performance characteristics for specific product applications. Near IR Transmitters are well established to measure moisture and coating thickness in the lamination process. Cross Direction Web Profilers greatly assist in producing an even in-specification profile of adhesive thickness. The resulting composite may be designed as a superior moisture or odor barrier, to highlight/protect appearance or gloss, reduce sound transmission, to increase strength or structural stability and many other applications.
Auto windscreens (windshields) laminate two pieces of glass with a layer of PVB (polyvinylbutyral) or other suitable polymer to prevent or minimize sharp glass shards from showering on driver and passengers on impact by wrapping the glass surfaces with the polymer. Near IR can measure the film moisture and thickness.
Converting industries such as Tag, Tape & Labels, Packaging & Release Liners, Textiles and others operate Near IR to measure the adhesive coat weight applied and the moisture after unit operations such as dryers, re-moisturizers and final windup for QC and Process Control. For converting applications a two roll laminator is often employed with one roll made of neoprene or other suitable rubber and the other roll made of steel or chrome plated. The rubber roll applies pressure to the adhesive but also allows for compensation of caliper variations. Nip roll pressure and skew assist in optimizing the process.