Stack Type Flexo Printing Machine
Xianghuai Machinery: Your Trustworthy Stack Type Flexo Printing Machine Supplier!
What is Stack Type Flexo Printing Machine?
Stack Type Flexo Printing Machine, sometimes also referred to as stacked flexographic presses. The independent printing units are stacked on top of each other, arranged on one or both ends of the main wall panel of the printing press, or the printing units of various colors are installed on the rack. The individual impression drums located at each station are called impression rolls, whereas the central impression drum (CI-Press) is referred to as the impression drum. Each printing unit is turned by gears mounted on the main wall panel. Stacked mimeographs can print 1-8 colors, but usually 6 colors.
Features of Stack Type Flexo Printing Machine
Stable Operation
These flexo presses use direct drive technology for each counter impression cylinder, eliminating the need for a main drive as is the case with central impressions. All their drives are master drives and communicate synchronously to maintain network registration throughout the printing process.
Automatic Cleaning
These presses have an efficient automatic cleaning system built into them. All selected decks are automatically cleaned, preventing ink drying, color mixing and mold growth, and allowing for quick ink color changes after use.
Accurate Overprinting
Our stacking flexo presses use servo motors on the unwind, infeed nip, outfeed nip and rewind to perform a registration point search and automatically send registration corrections to the material before it reaches the web inspection system each axis without stopping printing.
Safe Design
Our stacking flexo machines are completely gearless and the cartridges inside them are completely closed when not in use, without any movement. This allows operators to safely change sleeves and ink sets during production.
Key Components of Flexo Printing Machine
The Anilox Roller
The anilox roller, often lauded as the quintessence of the flexographic printing press, occupies a central role in the calibration of print accuracy and quality. This exquisitely engineered cylinder is meticulously etched with a multitude of diminutive cells, each functioning akin to a minuscule ink reservoir. Each cell picks up ink from the fountain and delivers it to the printing plate with amazing accuracy. The meticulous design of these cells, including their size and pattern, is customized to control the exact amount of ink that’s applied. The impact of the anilox roller on print clarity is tremendous. Take a roller with a cell line count of 1000 lines per inch (LPI), for instance; it’s able to reproduce extremely detailed designs, perfect for high-end items like beauty product boxes. Meanwhile, rollers with fewer LPI are tailored for bolder, simpler prints such as standard shipping boxes. Its ability to adapt makes the anilox roller a key player in the flexo press’s diverse printing prowess, offering precision and steadiness that cater to a wide array of print needs. The KETE GROUP LIMITED flexo press incorporates anilox rollers ranging from 200 to 800 LPI, to match your specific needs for print detail and quality.
Printing Plates
Flexo printing plates transfer your design onto all sorts of materials. These plates are usually made of a bendy, rubbery material, shaped just right to hold your image. It all starts with a master plate that gets the image carved or molded onto it. This step, called platemaking, uses a photopolymer plate that gets hit with UV light through a film mask. This makes the exposed parts hard and leaves the image standing out. Then, the bits that didn’t get light are washed off, leaving a raised design on the plate.
Next, this plate gets attached to the plate cylinder in the flexo press. The plate needs to be flexible so it can fit snugly around the cylinder. When it’s time to print, the anilox roller puts ink onto these raised bits of the plate. As the cylinder turns, the plate presses against the material – maybe paper, plastic, or foil – and stamps the ink onto it, making your print. The cool thing about this is how the flexo press can print on all kinds of surfaces, even if they’re not totally flat or smooth. That’s why these presses are so good for lots of different printing applications, like packaging or labels.
Impression Cylinder
It provides the necessary pressure against the plate cylinder, enabling the transfer of the inked image onto the substrate. The pressure must be finely adjusted to ensure a crisp and even print, avoiding issues like smudging or uneven ink distribution.
Ink System
Flexo presses employ a sophisticated ink system, accommodating a variety of ink types including water-based, solvent-based, and UV-curable inks. The choice of ink depends on the substrate and the desired print characteristics. The system includes an ink pan, where the ink is stored and an optional doctor blade for scraping excess ink off the anilox roller, ensuring a precise ink film.
Pros and Cons of Stack Type Flexo Printing Machine
Advantages to Stack Type Flexo Printing Machine Presses :
Both Side Printing
Most operators can reverse the web so that both sides can be printed in one pass through the press. The web can be threaded in many different ways, allowing the reverse side to be published completely dry before the ink is applied, provided enough area is set aside for drying between stations.
Easy to Access the Colour Station
The second benefit is that the colour stations are readily accessible, making changeover, washing up, etc.
Short-run
Stack presses are the best choice for short-run live printing and fast delivery in small batches. They have many stations, using one machine for many purposes and special printing.
Limitations of Stack Type Flexo Printing Machines
It is difficult for the stack flexographic printing machine to achieve overprint accuracy when the substrate is malleable or very thin material, limiting colour prints when printing. However, the stack flexographic printing machine is easier to print and more economical when the substrate is thicker or can withstand relatively high tape tension, such as paper or multi-layered composite films.
Flexo presses come in various configurations, each catering to specific needs.
Stack Press
The stack press stands out in the world of flexo printing because of its vertical layout of print units. It’s designed to stack multiple color stations on top of each other, even letting you print on both sides at once. This is perfect for complex, multi-color print jobs, especially when space isn’t an issue. A typical stack press could have 4 to 8 color stations, each ready to apply a different color. This setup is super useful for detailed designs and color gradients, like the ones you see on fancy cosmetics or luxury product packaging.
What’s cool about the stack press is that each printing unit works on its own. This means printers can tweak each color separately without messing up the whole job. This independence is key to getting really high-quality prints, especially when you’re deal.
In-line Flexo Press
The inline flexo press is a star when it comes to churning out loads of prints, especially good for standard-sized stuff like medium labels and basic packaging. It lines up all its printing units in a row. This way, everything gets printed in order, one step after the other. You can have up to twelve units in this setup, letting you print in 12 different colors. Each unit takes care of one color, and the material just glides through them in a straight line. It’s super popular for basic packaging and labels because it handles common materials really well, striking a nice balance between speed and quality. Plus, it can do all sorts of extra things after printing, like hot stamping, laminating, and die-cutting.
CI Flexo Press
The CI Flexo Press is a standout in premium print quality, especially great for medium to wide widths printing materials like plastic bags, pouches, films, paper, and nonwoven fabric products. Its big thing is the central impression cylinder, which is the heart of the whole setup. All the printing units wrap around this central drum. This unique setup makes sure the material tape hugs the drum’s surface tightly in the CI flexo printing machine, keeping things tight without gaps between colors. It holds its position no matter if the material size changes a bit.
Compared to inline flexo presses, this design nails color matching because it doesn’t need any automatic registration control system to keep colors lined up just right. Furthermore, the large diameter of the cylinder helps keep the material flat. With capacity for up to ten colors, each print station adjusts separately. This lets you mess around with different inks and cool effects like shiny metallics, sparkly pearlescents, and silky mattes.
Another ace feature is how it keeps the tension even across all sorts of materials, making sure your prints are perfect and free from any stretching or squashing. It’s spot on for printing on delicate or thin stuff, where even a little mistake can mess up the print. The path from where the material starts to where it winds up is super short in a CI flexo machine, which means you’re not wasting stuff.
Now we have gone through the main processes and technologies used in flexographic printing, it is time to explore whether or not it is the best option for your print business. Now we look at the different options available to you.
Setting a Realistic Budget
Setting A Realistic Budget Because flexographic label printing presses are reasonably complex and large machines, they inevitably involve a considerable investment. These can result in increased wastage, increased returns, inaccurate print replication and overall reductions in quality. So when planning an investment in new flexographic equipment, what sort of budget should you be working towards? This is an open question with lots of variability, so first we will look at factors that affect the market value of flexographic label presses.
Factors Affecting the Price
Number of colours: The more colour options, the more expensive the press will be.
Web width: To print wider labels, a larger impression drum is required, thus adding to the unit cost.
Type of drive system: The more technologically advanced the print drive system, the more it will cost. Your options relate the level of technology & components are involved in the drive. A non-servo drive will operate manually on an open loop system with some simple automated components, whereas a full servo drive is a closed-loop system with more extensive technology options. It will monitor feedback signals from the press and make automatic adjustments to maintain tension, register, and print speed. A partial servo drive has some, more limited feedback options, but not as many as a full servo drive.
Type of drying system: As discussed earlier, print can be dried through high-pressured air , Infrared or ultraviolet curing. Some presses also use LEDs to fix the ink to the substrate. LED & UV systems are more expensive than IR and fan powered systems, although LED may have lower energy requirements and thus cost less to run.
Level of automation: Modern printing presses can be very sophisticated, with high levels of automation. For print businesses this cuts back on manpower requirements and can make your production line more efficient, but it will involve a larger initial investment.
Optional equipment: Additional equipment, such as Web Cleaners, Corona Treaters, Video inspection systems , conveyor systems, will increase the amount of money you need to spend on the press. Have a clear idea of essential features you need. Don’t overload your specification with options you may never use.
Average Price Ranges for New Machines
The prices for new machines vary considerably, depending on their size and features, so these estimates should only be taken as very loose averages. Nevertheless, they do give an indication of how much you should expect to pay for a new flexographic print machine. If you receive a quote that is significantly lower or higher than these figures then it is wise to treat it with some scepticism. Find out from the manufacturer what additional features or cost savings justify the price.
Six colour presses: Price range varies from £100,000 up to £450,000 for large machines. An average investment would be £150,000- £295,000.
Additional colours and specialist applications: Investment price starts to rise as more colours and specialist applications are added. A non-standard or high level specification press could cost in excess of £600,000.
Is There a Cheaper Alternative?
However, we cannot emphasise enough that simply looking for the lowest quote is a false economy. Instead of looking at the cash figure of your initial investment – which in most cases can be attained through credit – it is more realistic to view your purchase in terms of ROI. So long as you purchase a print press that closely matches the requirements of your business, then the resulting increase in productivity and sales output will soon make your investment worthwhile.
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Frequently Asked Questions of Stack Type Flexo Printing Machine
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