Our custom packaging specialists have been getting a lot of questions about the different printing methods, so we figured a blog post was in order.
There are 5 main printing techniques that we use in the packaging industry, each with their own advantages and disadvantages. In this post, we will focus on the following:
commonly known as Offset or Litho
This technique is a combination of 2 older printing methods – lithography and offset, and is an indirect printing system. It’s the most prominent technique in packaging today due to its versatility in printing and high image quality.
HOW IT WORKS:
A plate (most often made of aluminium) is engraved with the image to be printed, inked and pressed into a rubber roller to be then transferred to the printing surface which must be flat.
The ink is made of an oily substance that repels water and there is a dampening system set in place that will place water onto the surface where ink should not go. This means that the image areas of the surface will be receptive to ink, and the non-image areas will repel ink and be receptive to water.
Some presses do not use a dampening system (“dry offset” or “waterless offset”). In these cases, manufacturers use a silicone layer to repel the ink where it should not be printed.
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commonly known as Flexo
This technique is like a modern version of the letterpress. It gets its name from the use of a flexible relief plate in the process and is often used in the printing of food packaging.
HOW IT WORKS:
Whereas Offset is indirect, Flexography is a direct process where the rubber printing plate transfers ink directly to the printing surface.
The image is first engraved onto the plate with a laser. Then the ink is transferred from its chamber to an anilox roller where a blade removes the excess ink. After this is completed, the ink is pressed onto the printing surface, and the product is coated in the desired finishing.
Originally, flexography produced somewhat mediocre images, but with the help of digital printing, the quality has since improved.
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Digital printing has grown rapidly within the industry in recent years. Its popularity is due to its precision and efficiency. You already have these printers in your home, office, business place and other common areas. With the availability of printers and cartridges in the market today, desktop publishing of high quality images is possible.
HOW IT WORKS:
This technique is very straightforward – the image is transferred from a device (e.g. a laptop) directly onto a variety of printing surfaces. In manufacturing, a large-format or high-volume inkjet or laser printer is used, instead of the one you may have on that desk in your study.
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commonly known as Gravure
Gravure is a direct and rotary technique of printing on packaging. This technique is ideal for very high volumes, such as newspapers and magazines.
HOW IT WORKS:
This process includes a rolling cylinder which is engraved with the image that has to be printed. Once completed, it is inked and pressed directly onto the print surface to transfer the image.
The rolling cylinder has different cell depths for ink. This means that deeper cells will have more ink and will be more intense in that print area, whereas a shallow cell with produce a lighter outcome.
Rotogravure printing is slowly being phased out in favour of Offset (for publication) and Flexo/Digital (for packaging).
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commonly known as Screen
This type of printing is what we use exclusively to print on our reusable bags.
HOW IT WORKS:
This process uses mesh to transfer ink onto a print surface with the use of a blocking stencil to guide ink placement. Machines move a blade across the screen to fill the open mesh sections with ink. Finally, the blades reverse which causes the screen to momentarily touch the surface.
When screen printing, you can only add one colour at a time. This means that multiple screens would have to be used in sequence to produce a multicolour design.
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There are a number of factors to consider, each being unique to the client. If your biggest concern is the quality of printing, then we would suggest the following options:
Other factors that can come into play when choosing a printing technique are:
Our custom packaging specialists can guide you towards the right product, technique, volume, and more. At LeKAC, we’re not happy until you are!
Call us today for a free consultation.
For more information packaging box printing services, please get in touch with us!