New progress in online finishing technology
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Print is different from digital media, and it relies on its many different visual and tactile characteristics. Therefore, the surface finishing of printed products today has become the most important issue on the customer's agenda. The drupa show in 2008 showcased new or enhanced glazing, lamination, hot stamping, die cutting, and holographic elements. In this four-year technical journey, we are delighted to see a number of solutions and new finishing materials that bring economic benefits, online production capabilities.
First, the hot effect of cold stamping technology
Cold stamping technology is another option developed by manufacturers for combination processes and seeking in-line finishing. Cold stamping, also known as cold foil transfer, requires the use of two printing units. In the first unit, the special adhesive from the ink unit was transferred to the substrate through an offset plate with high resolution and detail reproducibility. In the subsequent second unit, the metal foil was transferred to a partially coated substrate.
For example, Manroland's press features two additional print towers. The printing tower can be placed on any two adjacent printing units to achieve a twist-free foil path. By placing a metal foil rewinding and unwinding device in two separate printing towers, the pressure is evenly distributed and the individual printing towers are not subjected to excessive pressure.
The high resolution that cold foil transfer can have opens up new design possibilities in terms of type and subtle detail. Standard hot stamping technology requires the use of a relief, which directly means that the system can only reproduce less detail. The offline hot stamping process has a lower registration accuracy than the inline cold foil transfer process. The in-line cold stamping technology was incorporated into the printing process and demonstrated a registration accuracy comparable to offset printing.
One of the main factors worthy of emphasis on cold foil transfer over offline hot stamping technology is that the former can be overprinted. Unlike hot stamping, since the transferred metal foil is applied flat on the substrate, it can be easily printed directly after the transfer is completed.
The combination of cold foil pad printing and subsequent overprinting opens up many new design possibilities, which also means that the acquisition and storage costs associated with the process become lower. In standard hot stamping techniques, the metal foil is typically constructed of a carrier material that is actually coated with two transfer layers. The situation is completely different for users of in-line cold stamping equipment because the ability to overprint the surface of the foil means that any hue can be reproduced and there is no limit to creativity.
The cold foil transfer technology allows the product to be printed without a limited color tone, and may even print a complete image on the foil portion. Since the printing on the metal foil is not inferior to the Arabian Nights in the hot stamping process, the hot stamping user has no such effect. At the same time, the overprint after cold foil transfer also improves the adhesion of the metal foil to the substrate. The transferred metal foil can be printed using conventional, UV or hybrid inks.
Three-dimensional effect
The help of hot stamping users is still in progress, and these users are constantly sighing for the lack of three-dimensional effects in the cold foil transfer process. Manroland is currently working with partners from the supply chain to develop a hot stamping process that enables the transfer of cold foils that are molded and detailed. Although this process is still under development, it still shows great potential in improving conversion time and quality. In the future, this process will allow flat metal foils to create a three-dimensional effect on the sheet by virtue of the molded structure. Manroland has patented this combination process as “a combination of cold foil transfer and three-dimensional imprinting”.
Second, online glazing is becoming more and more abundant
From ordinary protective coatings to bright overlays, varnishes have evolved into attractive design elements in a variety of different forms. The pressure exerted by the customer on the delivery deadline is increasing, so that the print coated with the protective coating can start the job more quickly in the next stage. However, because brighter prints are often considered valuable, their demand has been driven by machine builders and ink and coatings manufacturers.
Whether it's full-page glazing or partial glazing, the creative use of glazing results in a print-to-touch effect that makes the print stand out; and print service providers can differentiate themselves with appropriate value-added services.
Printing equipment equipped with a hybrid or two coaters provides extremely effective matt and brilliance. Metallic luster and pearlescent effects can also produce an unusual visual impression. The scented varnish gives off a pleasant scent, and the smear of varnish is surprising. Foam varnish and viscous varnish add to the packaging function. UV varnish improves the performance of folding cartons, plastic films and cards. Many companies see online glazing as an interesting option to replace offline glazing in terms of quality and economy, and they have to do it themselves. Currently, more than half of the large and medium format sheetfed offset presses that have been delivered contain at least one coater.
Printing machine features
When working with extended delivery devices, printing units, drying units, and automatic replacement glazing systems, the following coater concepts have the greatest need in reality:
Use aqueous dispersion coatings or UV coatings on commercial or packaging presses with a coater;
• Oiling, aqueous glazing or UV glazing on a hybrid press with a coater;
· Water-based glazing machine + UV glazing or special effect glazing machine for two glazing.
Primer coating or double-sided glazing for primers, special effects coatings can be achieved with a special press configuration, and the glazing module is even integrated into the rotary press.
As an alternative to the cavity doctor coating unit, the current demand for roll coating units is relatively low, and in recent years, the numerous advantages of the cavity doctor technology used in offset printing have led to a wide range of applications for this technology. For standard offset processes that still use inking units, plates and blankets in the last printing unit, the only form of glazing is over-oil. However, there is still a choice that the modular cavity doctor unit that replaces the blanket cleaning device relies on an inking device instead of the delivery mechanism. However, this also depends on the press equipped with infrared and hot air drying units.
High quality inline finishing using aqueous dispersion coatings and UV coatings is only possible with one or more glazing units.
The glazing plate is a smooth coated blanket for full glazing, or a peel-coated blanket or a photosensitive resin relief for partial glazing. Although two to three roll coating units are still used, the current cavity knife coater represents the highest level of technicality for offset on-line coating. The coating quality is visually superior whether it is from the uniformity of full-coating or from the details of partial coating. The consumption of paint is also lower than that of the roll coating unit; the principle of reproducible metering is another advantage based on the fact that the amount of material transferred depends on the cell volume and engraving on the anilox roll. Form, not speed. The cavity knife coating unit is also suitable for printing metallic or pearlescent coatings, as well as white opaque aqueous and UV coatings.
Coating in waterless offset printing
Waterless offset printing, which can be used with conventional dry inks and UV-curable inks, exhibits extremely high print quality; combined with other modern technologies such as FM screening and color space expansion, waterless offset printing can produce some excellent product solutions. Online glazing has been ingrained in this area, and waterless offsets that combine on-line glazing and use UV inks are used in every aspect.
This is especially the case for long inking units, including sheetfed offset printing cartons, printing plastics and foils, and narrow web offset printing, which is commonly used for printing labels. Waterless offsets do not use dampening fluids themselves, meaning that the inks used are inherently brighter than 3% to 4% higher than wet offset printing.
Third, the new finishing materials
In this scent glazing technique, the fragrance encapsulated in the capsule is applied to an area having an area of at least 10 cm2. Standard fragrances such as peaches or strawberries can only be kept for 2 or 3 days before production, and the delivery schedule for special products depends on the fragrance. Indispensable is that the fragrance is pre-formed to have a similar material to that used in official printing.
The use of microcapsules in the printing process is not whimsical, and the quality of the fragrances in particular allows the cosmetics industry to use this option to provide samples of the perfumes produced by the company itself. At the same time, Schubert International has also stored countless standard fragrances that can be used to enhance the effectiveness of advertising and turn it into something special.
The microcapsule technology allows the fragrance sample to be preserved for extended periods of time and allows the closed volatile essential oil to be coated with the coating to minimize printing costs. The fragrance can only be released when the coating is rubbed. This process can be repeated as many times as needed.
Well-known cosmetics companies, as well as large and small brand owners, advertising agencies, graphic design studios and printers are users of fragrance products.
creativity
The scent printing process used to enhance the impact of scent advertising shows a number of advantages:
· Economical coating by any printing process anywhere in the world;
· No special space is required for coating and release;
· Several fragrances can be used on the same page;
· The fragrance will not be released too soon;
· The fragrance can be repeatedly released, it will never lose strength;
· It has unlimited storage time, depending on the expected life of the essential oil;
· Almost any fragrance can be used;
Single source packaging and coating technology. In addition to perfume advertising, microcapsule technology can also be applied to a wide range of industrial applications.
Technical application
The secret of this process is microcapsule technology, which expands the range of fragrances that can be processed – magazines, brochures and perfume samples. The fragrance encapsulated in the capsule is dispersed in a special varnish and can be used as a fifth color in four-color printing. It is suitable for a range of paper grades, full-coating or partial glazing. The microcapsules ensure a long service life without compromising the strength. This method is economical because it can be implemented anywhere in the world by ordinary equipment and can be used in any standard printing process such as offset, gravure, flexo and silk screen printing.
No special equipment is required, and the fragrance can only be released if the capsule is damaged by friction or tearing. This process can be repeated multiple times without losing the intensity of the aroma. For the first time, this technology allows different fragrance samples to be placed together.
The scent from flowers, fruits, spices or wood emphasizes the uniqueness of the product, giving the product a unique feel that increases the likelihood of commercial success.
The size of the printed area is a determining factor in the application of the microcapsules and the manner in which they can be presented. The printing area must not be less than 5 cm x 5 cm, because if the area is less than 5 cm x 5 cm, the customer must rub an area very accurately in order to release the desired flavor intensity. The expected lifespan of the fragrance has been greatly amazed, and the duration of the fragrance will be as long as the advertising medium.
The scent can be mixed and applied within 2 to 3 working days. In the case of special fragrances, the delivery time depends on the time required to obtain the essential oils.