Printing processes.
The use of finishes · Technical principles
Revision notes
Paper and Board Printing Processes
Industrial printing involves applying graphics to a substrate (the material being printed on). Most processes use the CMYK (Cyan, Magenta, Yellow, and Key/Black) four-colour process.
Screen Printing
Setup: Uses basic screens and inks; low setup costs make it ideal for workshops.
Method: Ink is pushed through open areas in a mesh screen. A different screen is required for every color used.
Usage: Slow process with a high cost per unit. Best for small runs of posters, display boards, and T-shirts.
Flexographic Printing
Flexography uses flexible relief plates and fast-drying, water-based inks. It is common for packaging and continuous patterns.
Advantages:
Extremely high print speeds.
Perfectly suited for very long production runs.
Can print on a wide variety of substrates (plastics, films, paper).
Low cost of equipment, consumables, and maintenance.
Disadvantages:
The initial cost of printing plates is high (though they last a long time).
Setting up the job requires a large amount of substrate, leading to high initial waste.
Any changes to the print content are time-consuming and difficult.
Offset Lithographic Printing
A highly versatile process based on the principle that oil and water do not mix. It can handle up to 10 features (CMYK, metallics, varnishing, and double-sided printing).
Advantages:
Provides consistently high image quality.
Most cost-effective for high-volume runs (1,000+ units).
Printing plates are quick and easy to produce.
Plates have a long life because they only touch a soft "printing blanket" rather than the abrasive substrate.
Disadvantages:
Setup and running costs are too expensive for small quantities.
Digital Printing
Digital printing is the go-to for speed and efficiency, as it requires no physical plates.
Capabilities: Produces full-color, high-detail prints with the ability to change the design on every single page (front and back).
Mass Customisation: Ideal for "Print on Demand" (e.g., personalized names on bottles) because it uses fast-drying inks and requires zero setup time between different designs.
Usage: Popular for both low- and high-volume runs, especially promotional materials like flyers and business cards
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