Analysis of signage silk screen and transfer printing technology
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Precautions
Care must be taken to keep the printing unit absolutely clean and free of dirt. It is recommended to implement a variety of special cleaning measures to ensure the best results. The above information is for reference only. The specific details need to be tested by the customer to determine the applicability and reliability of the process. This section describes standards and warranties that cannot be considered quality production.
Printing speed is recommended between 150 and 300 fpm (feet per minute). With two UV lamps of 600 watts per foot, good results are obtained at a speed of about 300 fpm.
When the electrochemical aluminum peels off the substrate, the peeling angle is as small as possible to ensure the fine line effect of the image.
There are two different types of adhesives: radiation curable and cationic active agents (Cationic). The difference between the two is that the radiation-curable type reacts only when exposed to UV light, while the latter has an "initial cure" process that makes it tacky and then fully linked to cure by a "post-cure" process. Which adhesive is chosen is determined by the settings of the press.
Radiation curing method
1. Printing adhesive
2. Composite electro-aluminized aluminum to the surface of the material
3. The composite foil and material are hardened by the UV lamp, and the aluminum foil is tightly adhered to the material.
4. Stripping aluminum foil (may require die cutting/stripping)
Cationic active form (Cationic)
1. Printing adhesive
2. The printed material is cured by UV light to make the adhesive sticky.
3. Composite aluminum foil to the surface of the material
4. Stripping aluminum foil (may require die cutting/stripping)
Coldfoiling is a process in which an adhesive is applied to a substrate and then combined with an easily peelable type of aluminum (aluminum foil) to form a pattern; it is not necessary to use a hot stencil or a heated rubber roller to heat Printed. In the past 5-10 years, only a few companies have been able to commercialize this process. Now, we refer to several leading foreign manufacturers to apply this technology, and introduce the latest developments and related experience to everyone.
Quick start setup (setup)
No need for metal punch
Eliminate pre-processing costs
Short/long version
A weapon to advance into new market space
Good version effect
Faster production speed than hot stamping
Wire processing
In-plant processing
Quick change of turnover
What do you need for cold foil transfer?
UV printing / UV flexo printing machine
Medium hardness plate
UV curing adhesive
Composite unit (hardness 85 or higher)
Cold peeling type aluminum alloy (Coldfoil)
Clamping roller (upper roller rubber / lower roller steel)
UV light (at least 400 watts per inch)
Various specifications of anilox rolls
Key to successful application
Anilox rolls should be carefully selected to match the plate design and substrate
Unwinding and rewinding composites must work well
The tension of the aluminum foil web must be well controlled
The pressure of the nip roller can be adjusted according to different substrates
Impurities on the substrate can affect the quality and curing of the adhesive
The hardness of the nip rolls must match the plate design and substrate
The mark on the plate can significantly improve the quality
Processing essentials
Coating material or adding filler material (material such as paper or cardboard) to prevent impregnation
Film material should be pretreated or top surface precoated