Calculating Counter Die Relief Depth across Laminated Substrate Thickness Variances
Counter die relief depth calculation requires adjusting nominal board caliper for dynamic fiber compression, film stiffness, and moisture regain clearance.
Combination Hot Stamp Embossing
Finishing Process
Single-pass decorative conversion techniques apply metallic foil layer transfer while simultaneously raising board surfaces into sculpted three-dimensional profiles. Combination hot stamp embossing executes foil adhesion and blind relief shaping in a single press stroke using a heated brass die and matching counter. This method governs register precision between metallic foil coverage and tactile surface contouring on packaging cartons.
It stops applying when thermal limits of heat-sensitive plastic films or un-coated paperboard substrates are exceeded.
Substrate Behaviour
Surface tension and moisture content within paperboard fibers govern how stock responds to heat and pressure during foil adhesion. Executing combination hot stamp embossing demands precise temperature control to melt die-side adhesive layers while molding paperboard fibers. Excess heat weakens board fibers and causes foil flaking along sharp creased edges.
Insufficient temperature prevents full foil transfer and leaves unbonded areas across raised detail features. Fiber selection influences crispness, as long bleached softwood fibers stretch around relief peaks without tearing.
Pressure Limit
Excessive tonnage applied during processing crushes internal paperboard fluting and fractures decorative foil layers. The application of combination hot stamp embossing must remain within defined impression limits to preserve structural wall integrity. Over-impression causes substrate fracturing along sharp detail borders.