Hot_stamp_foil (烫金)概要1.ppt

Hot stamp foil or transfer foil is a way of transferring an image from an inert carrier onto a variety of substrates to give a sharp detailed design. This transfer is normally achieved using a heat press and dye stamp, where the base coat acts as a hot melt adhesive and the top coat gives a high gloss finish. The majority of stamping foils employ polyester film as the base or carrier. This is because polyester is dimensionally stable over a wide temperature band. The first step is the application of a very thin layer of release coat (to ensure that subsequent layers transfer when required) followed by a lacquer (in the case of metallics) or a layer of pigments. The final coat, called a size coat, is a heat activated adhesive coat whose composition varies depending on the substrate that requires printing. The final process involves reeling the film up to 2 meters wide and 600 meters long and then, when required, precision slitting to meet the exact requirement of the customer. The normal press temperature is 110-130 degrees centigrade and pressure is up to 5 tonnes. The dwell time is very short normally measured in fractions of time. METALLIC FOIL Carrier: Normally a 12 micron uncoated polyester Release layer: Wax to prevent lacquer coat from  sticking to the polyester Aluminum: Thin vacuum metalized coating of| (Al) to give the metallic appearance Adhesive: Thin heat activated adhesive PIGMENT FOIL Carrier: Normally a 12 micron uncoated polyester Release layer: Wax to prevent lacquer coat from  sticking to the polyester Pigment: Pigment compounded with acrylic resin Adhesive: Thin heat activated adhesive The total coating is less than 2 microns 1. Polyester film 2. Release coat 3. Clear coat 4. Vacuum metalizing 5. Adhesive layer Process of making Hot stamp foil 1. Polyester film 2. Release coat 3. Clear coat 4. Vacuum metalizing 5. Adhesive layer Lacquer Top Coat : Paraloid Resins That