Another way of reducing errors, including inadvertent tampering, is to transfer messages between machines via USB, with different users assigned different levels of permission to create, select or change messages.

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Similarly, automatic code selection is enabled where barcode scanners are linked to printing and marking equipment. Additional protection of message accuracy is delivered where an individual or multiple printers can be managed and monitored from a central computer.

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2.2 Quality

A poor quality code, which is either illegible against the substrate color or smudged, can also result in costly rework or scrappage. Digital CIJ and laser coding systems deliver many different code sizes and styles, including 2D QR codes, onto most materials with clear and legible printing. Non-contact printing methods enable variable data to be printed onto a range of container shapes such as rounded tins or the base of aerosol cans while maintaining consistent print clarity. Pigmented inks in various colors will ensure codes stand out against different colored substrates.

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Robust and reliable printers will be able to operate consistently even in 24/7 production environments. Printers with IP55 or IP65-rated steel enclosures, or a sealed printhead, offer protection against liquid or particle contamination and can operate in dusty or wet environments, to prevent unplanned stoppages and ensure high-quality continuous coding. Tough yet flexible printhead conduits can cope with repetitive actions such as traversing applications and contribute towards the continual operation.

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Quality machines will also offer greater functionality, helping to reduce costs while maximizing efficiencies. For example, printers with a carton coding feature have the flexibility to code both primary and secondary packaging with a single machine.

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2.3 Productivity

Printing and marking systems can help to minimize product waste and increase manufacturing uptime in several ways:

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Increased speed and flexibility

Traversing printheads are able to print across multiple products at high speeds. This is particularly useful for high volume lines. Versatile printers that can handle a variety of requirements, including multiple lines of text, and human- and machine-readable codes, will enable manufacturers to meet differing standards or regulations. This will help companies satisfy export market requirements for particular countries, and also provides a valuable element of future-proofing.

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Reducing stoppages

Features such as self-cleaning printheads will reduce blocked nozzles and maximize printer uptime, while timely and visible notifications of low fluid levels allow refills to be scheduled into planned production line stops.

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Planned stoppages can also be minimized through the use of printers with longer service intervals, and self-servicing and self-maintenance functions.

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Reducing waiting time

For manufacturers needing regular product changeovers, digital printing and marking technology allows multiple messages to be stored. These can then be switched at the press of a button, reducing the time spent setting up new information, compared to changing rollers or plates on non-digital machines. Multiple line settings, as well as data held in the printer’s memory, mean information specific to product lines can be set up and indexed in the machine, making for quick product changeovers. Lightweight machines that can be moved between lines and set up quickly reduce set-up time and downtime between production runs. They also allow producers to react quickly to changes in customer orders and to be more flexible in their operations.

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Reducing waste

Printing and marking systems that are able to apply the correct information in the right place on the product will help to minimize waste by reducing the amount of rework for incorrect codes, scrappage for products that cannot be re-coded as well as the extra time needed for reworking. This is increasingly important where the amount of space available for functional information may be limited, which requires printers that are able to deliver the code accurately into a small area.

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Reducing processes and over-production

Technology which requires minimal start-up procedures and where the first print is as good as the last means there is no need to leave machines switched on permanently, or to run them every day.

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Machine versatility, such as the ability to print multiple lines of variable information as well as logos and carton coding all with one printer, will enable manufacturers to use a single model for

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printing onto a range of substrates. Less variation in machine types also leads to fewer instructions to learn and a reduced inventory of consumables.

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3. Printer selection – factors to consider

Linx’s own Voice of Customer research suggests that the key drivers behind printer purchases in the chemical manufacturing industry include flexibility of operation, where printers can code onto a range of materials and colors. The quality of the finished code is also important in order to meet customer and regulatory requirements. In addition, controlling costs from unnecessary downtime and missed production targets can be supported by a robust, reliable coding solution, which is simple to use and which saves time when setting up and operating.

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As part of the selection process, the speed of the line and the materials to be printed are critical. It is important to have each material type sample-printed to ensure legibility, particularly if a range of different colours is involved. Consider also a trial of a printer on the production line, so that it is exposed to your specific production environment and processes.

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The overall Cost of Ownership of any new machine purchase should be investigated. This takes into account both the initial price and factors such as reliability and the cost of consumables over the machine’s lifetime. Frequent breakdowns can negate any benefits of a lower purchase price. Leasing and rental options may also be worth exploring.

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4. The different coding technologies

4.1 Continuous Ink Jet (CIJ)

As a non-contact printing technology, CIJ has the ability to print onto almost any type or shape of the material. A wide range of inks is available, including pigmented inks of different colors, fast-drying inks, and UV cure inks, which provide excellent adhesion, light fastness, and resistance to a range of chemicals packaging. These are ideal for preventing code transference during production or during end-use when accidental contact with a container’s contents could cause smudging or code removal.

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CIJ can print from one to multiple lines of text and simple graphics online speeds of over 7m/s for a single line of code. The compact printhead can be situated above, beside or beneath a production line or traverse from side to side across the line. With lighter models increasingly being produced, the CIJ printer is more capable of being quickly moved from line to line and is fast to install and set up. The technology can provide the ideal solution to enable start-up and growing businesses to move from manual coding to digital printing methods in order to produce higher quality and greater consistency of codes.

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4.2 Large Character Marking (LCM)

Case coders are particularly well-suited for printing variable information onto secondary packaging such as cardboard boxes. These outer cases usually require text and graphics which are easy to see.

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Case coders can print to a high-resolution quality, and are versatile enough for use on a variety of surfaces and materials. Benefits include ease of set-up and adjustment, reliability and predictable cost of ownership. They are a cost-effective alternative to pre-printed boxes or labels.

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4.3 Laser

Laser marking has no ink involved in the coding process and therefore no drying time or risk of smudging. Laser coders are suitable for a wide range of substrates and at high line speeds. Benefits include increased uptime, higher speed capability and the fact there is no use of consumables. Laser marking leaves a permanent code that on PVC produces a color change for added code visibility.

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Steered beam laser systems are highly versatile as they provide clear, consistent and perfectly formed characters in a variety of fonts and message formats, and enable the use of high-quality graphics and logos over relatively large print areas.

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Laser coders can also cover a large print area and on high line speeds. This makes them suitable for multi-lane printing onto multiple products in one pass, without the need for a mechanical moving printhead.

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Advances in technology and efficiency have led to a significant reduction in the initial purchase price, and laser coders deliver low cost of ownership due to no consumables and relatively low maintenance.

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A new generation of cost-effective compact laser marking solutions has also been introduced, which offers an affordable alternative to other technologies while still maximizing functionality.

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4.4 Thermal Inkjet Printers (TIJ)

TIJ printers can print onto both outer cases and primary packaging. Although having a smaller print area than case coders, they produce high resolution, quality codes, which support premium packaging. They can be a cost-effective solution for slower production lines or where production is not 24/7.