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Fecha de registro: 12-06-2021
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12-06-2021, 03:12 AM
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As with difficult-to-stamp coatings, the first steps when foil stamping on plastic are making sure that the plastic has been properly treated and has a dyne level above 38. Without pre-treating the plastic sheet first, the problems with ‘shark toothing’ or pin-holes will occur when trying to stamp.

Just as there are a variety of foils for various types of paper stock, there are specific adhesive formulations for plastic. The foil stamper needs to check with its foil supplier and order a foil product specifically formulated for plastics – a graphics foil will not be a good choice for these applications.

Because plastic can cause more problems with gassing or air entrapment than most paper stocks, utilizing a cylinder-style machine to apply the foil is a good option, if available. Applying the foil through a cylinder foil stamping machine will allow the foil to be laid across the plastic sheet. This stamping action differs from the vertical platen style machines that press the hot stamping die directly into the substrate, thereby trapping air. Another advantage with the cylinder-style machines is that the rolling action also can help keep the plastic from overheating and melting during the foil stamping process.

Utilizing a hard make ready, such as epoxy glass board, is a good choice for plastic sheets. This will help to keep the die from penetrating too far into the sheet, which can leave an outline on the back of the sheet. In addition, a domed makeready is recommended to help squeeze out any air or gasses that might be trapped between the die and the sheet. This is especially important with a larger flat stamp image area.
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