Direct-to-consumer (D2C) brands have continued to push the limits of what is possible with corrugated packaging. Inside Print is one of those trends that has surely challenged converting manufacturers to achieve a new level of corrugated quality. It has also been a source of either pain or prosperity for corrugated converters today, depending on their ability to efficiently achieve it. With the rising popularity of unboxing videos, this new trend has directed an incredible amount of focus to brand packaging unlike ever before! However, as more brands are requesting inside print, Corrugated Converters are struggling to find efficient and cost-effective solutions to meet the demand.

Achieving Inside Print Hasn’t Been Easy

In the past, inside print was a request that Printers rarely received, so it was easier to complete the request by double passing the board or referring to a competitor with these printing capabilities. Oh how quickly things have changed! Double-sided print has now become a common ask from D2C brands and unfortunately many corrugated printers are simply not prepared.

Corrugated Converters that double pass the board are finding that it is an inefficient method that demands precise registration, increases downtime and over-occupies machines. With the influx of these intricate print jobs, this method is no longer economical. As converters seek modern solutions to achieve two-sided print, efficiently and cost-effectively, they are hesitant, stating:

  • “I can’t afford a new machine”
  • “My equipment manufacturer doesn’t offer an upgrade”
  • “My equipment is too old to be upgraded”
  • “My facility can’t handle the downtime for installation”

Fortunately, there is an inside print solution that is compatible with many corrugated equipment manufactures, and easier than you think – Spectrum®!

Producing Inside Print Is Now Easier Than Ever

Spectrum® Inside Print was engineered to produce beautiful corrugated print, while easing the concerns of many corrugated printers. Equipped with the SunTrac® Vacuum Transfer System for accurate sheet control, harmonic drive digital register for maintenance-free operation and ColorMaster® blade system for controlling precise ink metering, the Spectrum® Inside Print unit is perfectly designed to get the job done effortlessly and precisely. As a fully-contained printing station, Spectrum® can be retrofitted to most corrugated equipment, without causing major disruption to your plant operations. This innovative unit is designed to be added to the beginning or end of your existing equipment and does not require any machine upgrades to install. Printers can purchase one, two, three or more Spectrum® units to bundle together to expand their internal printing color gamut. With Spectrum®,  Corrugated Printers can now conveniently produce high quality print on both sides of the board, using their existing equipment, without double passing the board.

In addition to the thoughtful design of Spectrum, the SUN Service Team has a long history of working with various corrugated equipment manufacturers. From United, to Langston, to Staley and more, the SUN Service Team can navigate new and old equipment with precision and ease. The thoughtful design of SUN’s Spectrum® Inside Print, coupled with the expertise of SUN’s Service Team Members makes Spectrum® an easy, efficient and economic solution for corrugated printers looking to produce inside print. No capital equipment investments. No prolonged downtime. No prerequisite upgrades. No problem!

Contact SUN Automation Group today to see how easy it is to produce stunning packaging with Spectrum® Inside Print.





Dual Blade Ink Systems: Advantages and Disadvantages

It’s no secret that the corrugated market has slowly but surely increased in intricate process work. With the rise of E-commerce, unboxing trends, point of purchase displays and inside designs, corrugated printers needed to quickly adapt to the complex needs of the market to stay competitive.  As the demand for higher quality print continues to grow, corrugated converters are looking to new innovations to tackle the detailed designs of today’s top brands. Corrugated ink system manufacturers have made great strides in technology to help Converters achieve the precise, controlled ink metering needed for high quality print.

Currently, there are 3 types of corrugated ink systems: a roll-to-roll ink system, a single doctor blade system and a dual doctor blade system. Converters who have no requirements for process work should have no issues using the 2-roll ink systems to achieve flood coating or block letter printing of shipping box clients. However, Converters seeking to diversify their product portfolio and improve print quality should consider switching to an ink system that utilizes a doctor blade.

There are many reasons to switch to a doctor blade ink system, but which of the 2 doctor blade systems are best for your process? In this blog post, we’ll focus on dual blade, enclosed ink systems and the advantages and disadvantages of this technology. We’ve considered the same for single blade ink systems in another blog published here: LINK.

Dual Blade Ink Systems


A dual doctor blade ink system is a fully enclosed ink system, with two doctor blades installed – one blade for metering the anilox roll and one blade for ink containment. Dual blade systems require 2 end seals and adequate chamber pressure in order to maintain the tight seal between the ink chamber and the anilox roll.


Dual blade ink systems are catching stride in the industry as the premium ink system solution for high quality process printing. The major advantages of a dual blade system derive from its fully enclosed design. The sealed chamber protects the ink from the harsh environments of corrugated, sustaining proper ink viscosity much longer than an open system.  In addition, the secured chamber leaves little access for dust, dirt and debris to contaminate the ink or interrupt the ink pump, which improves color consistency, print quality and uptime. Also, ink waste is at a minimum with enclosed systems considering the containment blade holds ink inside the chamber and little ink is wasted within an ink pan. A dual blade system is a process work horse, effectively metering the tighter cells and intricate details found in today’s process work. Utilizing the advantages of a dual blade ink system is a sure way to delight customers with the best quality print.


Although dual blade ink systems are an incredible technology for process work, they, like many print systems, have some disadvantages. Because of the added containment components and the product development warranted for this ink system, the price of a dual blade system is higher than that of a single blade system. Also, a dual blade system is most effectively used for process work and is often restricted to that niche of print jobs, making them less economic for printers who print a variety of jobs on a single press. Additionally, there is the added costs of consumables (2 blades and end seals), which need to be replaced regularly. Lastly, enclosed chamber systems require more operator training, and therefore are more vulnerable to operator mishaps. Press disruptions like end seal blow outs, chamber leaks, nonuniform blades and more, can be caused by a new or under-trained operator interacting with the equipment.

AccuPrint™ Dual Blade Ink System

For converting machinery printing predominantly process work, a dual blade ink system is the best solution for your jobs. This system effectively meters higher line screen anilox rolls, while maintaining color consistency and print quality.

For superior graphics using quality inks and substrates, AccuPrint™ is the corrugated ink system of choice. Manufactured by SUN Automation Group, AccuPrint™ is a flexo ink-metering system that protects ink from the harsh factory environment to improve ink quality and performance. Designed to counteract the traditional disadvantages of a dual blade system, AccuPrint™ features a toolless design allowing for quick and easy end seals and blade changes. Additionally, AccuPrint™  is equipped with a pressurized air bladder to uniformly hold the blades in place to consistently meter the anilox. Ultimately, AccuPrint™ technology minimizes the risk for operator error. Backed by the SUN service and support team, SUN offers operator training and 24/7 on call or onsite support to assist with any and all operator needs.


Single Blade Ink Systems: Advantages and Disadvantages

The corrugated box is no longer just a simple medium to deliver products from point A to point B. Boxes are now a large part of the consumer experience and expected to be a sophisticated marketing piece. As a result, Corrugated Printers are quickly adapting to the complex needs of this new market to stay competitive. As the demand for higher quality print continues to grow, Converters have turned to chamber manufacturers to achieve the precise, controlled ink metering needed for high quality print.

Currently, there are 3 types of corrugated ink systems: a roll-to-roll ink system, a single doctor blade system and a dual doctor blade system. Converters who do not require any process work typically have no issues using a 2-roll ink system to achieve the flood coating or block letter printing. However, Converters seeking to diversify their product portfolio and improve print quality should consider switching to an ink system that utilizes a doctor blade.

In this blog post, we’ll focus on single blade ink systems and the advantages and disadvantages of this technology. We’ve considered the same for dual blade ink systems in another blog published here: LINK.

Single Blade Ink Systems

COLORMASTER® SINGLE BLADE INK SYSTEM CORRUGATED INK SYSTEMSA single blade ink system is an open ink system, with one doctor blade installed for metering the anilox roll. Single blade ink systems require an ink pan directly below the system to catch the run-off ink, which is then filtered and pumped back into the system. 


Single doctor blade ink systems have become increasingly popular among Corrugated Converters today for many reasons.  For starters, they cost much less than their dual-blade counterparts and are capable of effectively metering a variety of print applications: higher line screen process work, block lettering, flood coats etc.  Printers also spend less money on consumables– only one blade is required and no end seals are needed in single blade systems.  In addition, the open design allows for easier access for wash ups, decreasing clean times and therefore increasing press uptime.


Although single blade ink systems are the popular choice of blade systems, there are some downfalls to this ink-delivering technology. The most obvious disadvantage is the fact that the system is open, therefore exposed to the surrounding environment. If you’ve walked through a corrugated plant, then you know it can be a hostile setting for your ink. Dust, dirt, debris and scraps have easier access to an open system (single blade or roll-to-roll) and can cause hickeys and other defects within your print, as well as disruption within your ink pumps. The open system also makes it difficult to maintain ink viscosity, resulting in a breakdown in pigments and the need for possible amine additives. Another disadvantage is the potential ink waste. With a single blade system, ink residue is not only found within the ink cavity, but also within the ink pan, causing more waste than what you would expect from an enclosed chamber.

ColorMaster® Single Blade Ink System

For facilities producing a wide variety of orders – flood coats, process work, and block lettering – we recommend a single blade ink system. The capabilities of these systems are flexible and can effectively and efficiently meter an assortment of print jobs.

Sun Automation Group manufacturers an economic and versatile single blade ink system for Corrugated Printers – ColorMaster®. The ColorMaster® Single Blade Ink System is lightweight, corrosion resistant and economically designed to improve ink metering for printers worldwide. The design of the ColorMaster®  combats some of the traditional disadvantages of a single blade ink system. ColorMaster®  is equipped with a stainless steel shield to effectively shelter your ink from dust and debris, maintaining ink integrity and improving print quality. The ColorMaster® base assembly and SST ink pan (between frames) and all of its options are sold separately so you can purchase only what is required.  Even more, with our fleet of service technicians and coordinators, SUN can retrofit your machines with the ColorMaster® Ink System with limited downtime.

Ready to delight your customers with higher quality print?  CLICK HERE for more information on the SUN ColorMaster® Single Blade Ink System, and to request a quote.