Multi-material adaptability of hot stamping foil slitting machine: how to meet different needs of gold and silver foil, PET film, etc.?

When processing different materials such as gold and silver foil and PET film, the hot stamping foil slitting machine needs to meet the needs of multi-material adaptability by comprehensively adjusting equipment parameters, optimizing process design and targeted configuration. Here's how to solve it:

1. Precise selection and configuration of slitting tools

• Gold and silver foil: choose a round knife with high hardness and sharp edge (such as diamond-coated knife or ceramic knife) to avoid tensile deformation of the material; Suspended slitting is used to reduce the contact surface and prevent scratching of the metal layer.

• PET film: Use a bevel knife or flat knife with a low-friction coating (e.g. Teflon) to reduce electrostatic adsorption and burr. For high-thickness PET (e.g. more than 12 μm), a tool cooling system is required to prevent hot melt sticking.

2. Tension control system is dynamically adjusted

• Gold and silver foil: set low tension (usually 5-10N) and slow start to avoid material breakage; Closed-loop tension control + floating roller compensation is adopted to cope with the difference in metal ductility.

• PET film: medium to high tension (15-30N) combined with taper adjustment to ensure smooth slitting; Install an electrostatic eliminator (such as an ionic air bar) to prevent the adsorption dislocation of the membrane roll.

3. Differentiated design of winding and unwinding mechanism

• Gold and silver foil: use inflatable shaft + elastic bushing to avoid core indentation; When winding, the synchronous lamination function of the surface protective film is added.

• PET film: equipped with automatic deviation correction system (CCD detection ±0.1mm accuracy), with high rigidity magnetic particle brake to control the change of roll diameter.

4. Optimization of environmental and process parameters

• Temperature and humidity control: gold and silver foil should be kept at 40%-60% ambient humidity (anti-oxidation), and PET film should be kept at a constant temperature of 25±5°C (anti-heat shrinkage).

• Speed matching: The slitting speed of gold and silver foil is recommended to be 30-50m/min, and the slitting speed of PET film can reach 80-120m/min (depending on the thickness).

5. Material pre-treatment and post-processing

• Gold and silver foil: pre-coat release agent (e.g. silicone oil) before slitting to reduce slitting dust; A UV curing device is installed in the rear section to enhance the adhesion of the coating.

• PET film: pre-corona treatment (dyne value ≥ 42) to improve the suitability of subsequent printing, and vacuum packaging is used to prevent moisture after slitting.

6. Intelligent adaptation scheme

• Quick switching module: develop a material database to store tool parameters, tension curves, etc. of different materials to achieve one-click switching.

• AI defect detection: integrated online vision system to identify defects such as burrs and stripes on the edge of slitting in real time (such as the detection accuracy of bright lines of gold and silver foil can reach 0.01mm).

7. Solutions for special scenarios

• Composite slitting: For the PET/aluminum foil composite layer, multi-layer slitting technology is adopted, which first cold-cuts the PET layer and then fine-cuts the metal layer.

• Ultra-thin material (≤6μm): Added laser thickness gauge feedback control, combined with air suspension transmission to reduce mechanical contact.

Through the combination of the above technologies, the hot stamping foil slitting machine can cover more than 95% of the differentiated material needs, and the key points are the dynamic response accuracy and the non-destructive design of the contact parts. In practice, it is advisable to carry out regular tool wear tests (e.g. laser calibration every 8 hours) and to do small batch process validation for new materials.