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Cold stamping technology offers significant advantages over traditional hot stamping processes. It addresses common issues such as poor printability, difficult parameter control, and low productivity associated with conventional methods. Additionally, it enables synchronized printing and hot stamping, making it more efficient for various substrates like thermal paper, self-adhesive labels, and films.
Compared to hot stamping, cold stamping may result in weaker adhesion of the metallic layer on the substrate surface. Therefore, it is often necessary to protect the stamped pattern using a top coat or film. Due to the nature of the process, cold stamping can sometimes lead to defects like ghosting, halftone loss, or missing small dots. To avoid these issues, careful attention must be paid during operation.
In production, it's recommended to use a flexographic plate with high hardness and deep etching to ensure accurate image reproduction. Reducing the peeling angle during winding helps maintain the integrity of the cold foil. When printing small dots or gradients, a harder plate should be used to achieve better definition and prevent defects. Additionally, when using UV adhesive with sufficient photoresist resin, regular checks on the UV light source and reflector cleaning are essential. Using a high-solid-content UV adhesive also enhances adhesion between the foil and the substrate.
The laser imprint transfer process involves applying a layer of UV varnish onto the substrate surface. Under pressure, the laser pattern from the embossed transfer film is transferred to the substrate, followed by UV curing. This creates a brilliant laser effect similar to that of the original transfer film.
To improve the gloss of the laser imprint pattern, selecting a higher viscosity UV varnish or adding an appropriate amount of UV thickener can help. Also, using slightly purer ethanol can enhance the finish. However, it's important to control the ethanol dosage carefully to avoid negative effects.
To address issues like spotting or fading in the laser transfer pattern, maintaining proper drying conditions for the UV coating is crucial. Controlling the viscosity of the UV varnish, adjusting the anilox roll cell parameters, and regularly checking the UV curing and leveling properties of the varnish ensures even coating. This helps prevent defects caused by uneven application.
This content is excerpted from the second edition of "Printing and Printing Technology," published in 2012, under the section on Packaging and Decoration. For more detailed information, please refer to the journal channel.How to use eyelash curler?
The lash curler is mainly used to curl the eyelashes to make the eyelashes curl naturally.
1. Clamp the eye lash cueler to the roots of the eyelashes, slowly and gently press to move upward.
2. You can use the eyelash curler to first clip the eyelashes at the end of the eye 1/3, and then change the eyelashes at the head of the eye after the curling.
3. Finally, move the position of the mini eyelash curler to the front end of the eyelashes and gently lift it up to create a curling effect.
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