What are the most common printing inks for Family Birthday Cards on the market today?

What are the most common printing inks for Family Birthday Cards on the market today?

 

The history of ink goes back a long way, with the earliest known surviving documents dating back to the 26th century BC, according to Wikipedia.

 

Today, there are many kinds of printing presses, each with its own advantages and markets. Letterpress printing, which was a staple of printing until the 1940s, is rarely seen today. The following are the main types of ink used in today's printing presses:

 

Offset (paste) ink

Relief ink was eliminated by offset ink. Although letterpress inks are printed from sheets, offset presses can print pages in large quantities with roll-to-roll or sheet-fed presses. The three main types of offset inks are sheet-fed, thermoset and cold-set inks. Inks are usually oil-based and dry after printing. However, there is a growing emphasis on the use of renewable resources, such as soy products.

 

Until the 2010s, offset printing was the dominant printing process for about seven decades. They are ideal for publications; The coldest (or news ink) is the main ink for newspapers, phone books, etc. They consist of carbon black and adhesives, unless colored pigments are required.

 

Magazines can usually be printed on thermosetting presses (or intaglio printing for publications). These are roll-to-roll presses, capable of running at 2,500 feet per minute. Similarly, the composition of thermosetting inks is similar to that of cold-setting inks.

 

However, with the widespread use of the Internet, the newspaper and magazine market has suffered. Sales of news and thermosetting inks were affected accordingly.

 

This brings us to single-sheet ink. Single-sheet inks appear in magazines and annual reports and have declined in recent years. However, since the paper is fed into the printing press, they can also be thicker substrates, allowing for the production of folding cartons. These presses can now run up to 20,000 sheets of paper per hour.

 

Packaging has proven to be a growing market for sheet-fed printers. Sheet inks are usually UV cured. According to a recent study by Smithers, offset printing is facing change as technology redefines the industry.

 

Liquid ink for packaging

Liquid inks, mainly flexo printing and gravure inks, are the leading technology for packaging, and flexo printing is the leading process. Flexo and gravure presses are roll-to-roll presses. Depending on the substrate and application, inks cover all areas of water-based, solvent-based and UV technologies.

 

For example, because solvent-based inks are dried to remove solvents, they are typically found on plastic substrates and more often on flexible packaging. In contrast, water-based inks are the main inks for corrugated paper because they can be dried into corrugated board or kraft paper. Digitization is gaining ground in these markets, but we'll get to that soon.

 

As for the composition of liquid ink, the main difference between paste ink and liquid ink is the type of resin and additives. Paste inks use hydrocarbon resins, while liquid inks will use acrylics, nitrocellulose, polyamides and other types of resins.

 

Digital ink

Digital printing is the fastest growing area of printing. It has captured a market previously dominated by screens (billboards, tiles) and offset printing (direct mail). It is also growing in markets such as textiles and folding cartons. Digital ink has also expanded into the corrugated printing market.

 

The key to the development of digital printing is the technical advantage; Only on digital presses can small batches of products be produced in a cost-effective manner, whether it is a personalized mail, prototype or custom project, or a regional or targeted event. There are hybrid presses that combine digital technology with flexo or sheet printing, allowing printers to personalize items or add unique tracking codes.

 

As far as the composition of digital inks is concerned, a variety of colorants can be used. Dyes were originally used for most applications, but due to their light resistance, pigments have become more common than before. The key is that the pigment must be properly dispersed, as the viscosity required to spray the ink without clogging the printhead is crucial. For this reason, conventional resins are not commonly used. In terms of traditional additives, inkjet inks are commonly used surfactants, defoamer and rheological modifiers.

 

Energy curing ink

Over the past two decades, energy curing inks have made considerable progress in packaging and digital printing. These are broken down into ultraviolet (UV), electron beam (EB) and, more recently, ultraviolet leds, whose use is growing rapidly because it does not require the mercury-based lamps used in traditional UV.

 

The advantages of energy curing are reflected in the curing process. When exposed to UV, UV LED or EB light, the ink cures immediately. This reduces footprint as there is no need for an oven to heat ink, solvent capture equipment or a huge space for stock to dry. UV inks tend to be more expensive than water-based or solvent-based inks. Because there are no solvents or volatile organic compounds (VOCs), UV and EB are considered more environmentally friendly technologies.

 

The adhesives used in energy curing inks are different from traditional inks. For UV and UV leds, photoinitiators are essential for cross-linking the ink to the substrate. EB is cured using acrylic monomers.

 

Conductive ink

Conductive inks have grown into a considerable niche market for ink suppliers. Traditional photovoltaics are the largest market for conductive inks because the backplane is screen printed. Sensors are a growing field.

 

Screen printing is the main process, followed by inkjet. It depends on the application. For example, screen printing allows manufacturers to apply a thick layer of conductive ink or paste, which improves electrical conductivity. In contrast, if the idea of the printer is to use a small amount of ink in a target area, such as a conductive trace, the printer may use inkjet.

 

The most interesting difference in composition is the type of conductive material used for these inks and pastes. Silver is by far the most common because it conducts electricity so well. In terms of cost, copper oxide would be ideal, but the disadvantage is that copper will oxidize very quickly. Carbon-based inks are making progress in this area.