CI Flexo Plate and Sleeve Data Guide

Print quality on a CI flexo press is decided before the machine runs: the plate, the tape under it and the sleeve it mounts on hold most of the answer. XIAOPAI - Wenzhou Xiaopai Electric Power Technology Co., Ltd. - brings the FFS Heavy Duty Full Servo Sleeve CI Flexo Printing Machine to converters worldwide, working with long-established Chinese manufacturers on the build. This guide walks through the plate and sleeve data that sits behind a stable print, number by number.

1. WHY PLATE DATA COMES BEFORE THE PRESS

A CI press is a platform; the plate carries the image. That is why the plate specification is settled first, and it is a triangle of three numbers that must travel together: plate thickness, the tape that bonds the plate to the sleeve, and the print length the sleeve turns out. Change one and the other two are re-checked. A plate is not a consumable you re-order on habit; it is the image carrier that decides how each dot sits on the film, and the press can only hold what the plate delivers. The Master Series takes photosensitive resin plates - the standard plate type for the water-based and solvent-based environmentally friendly inks the machine runs. The industry's working knowledge around flexo print systems is discussed at Südpack strengthens its flexographic printing capabilities, and the same principles apply from plates to press.

2. PLATE THICKNESS: 1.7, 2.28 OR 2.84 MM

The FFS Heavy Duty Full Servo Sleeve CI Flexo Printing Machine accepts photosensitive resin plates in 1.7 mm, 2.28 mm and 2.84 mm thicknesses, with custom thicknesses available. The range is not decoration. A thinner plate holds finer detail and transfers it under lower impression, which suits film work where dot gain must stay controlled. A thicker plate carries more relief and tolerates the heavier impression that wide, heavy-duty film and coarser pattern work demand. Between the two ends sits the 2.28 mm middle - the general-purpose thickness that most FFS heavy-duty work settles on when the job mix is mixed. The practical rule is to match plate thickness to the job the press will run most, not to the finest job it might run once - because the tape and the sleeve diameter are then set around that choice. Ask the plate supplier for the correct exposure profile for the thickness chosen; the same artwork on a different plate height is a different print. The mounting maths is straightforward: the sleeve's machined diameter, plus the 0.38 mm tape, plus the plate thickness, add up to the printing circumference the press is calibrated around. That is why plate thickness is not a free choice per job - it is a press-level standard, and every sleeve in the set is machined to suit it.

3. THE 0.38 MM TAPE UNDER THE PLATE

Between plate and sleeve sits the double-sided tape, specified at 0.38 mm. It is the quiet number in the triangle. The tape bonds the plate to the carrier, but it also contributes to the total height that sets the running circumference, and its compressibility affects how the plate meets the substrate at impression. That is why plate and tape are ordered as a matched pair: a 2.84 mm plate and a 1.7 mm plate do not share the same mounting decision, and a tape swap during a job change is a plate-height change if the thickness is not held at 0.38 mm. Colour consistency across a long run is often a tape-discipline story before it is an ink story - the measurement practice behind that is covered at Siegwerk and X-Rite Pantone advance color management. Treat the tape as a specified material rather than a stationery item: hold one supplier and one thickness per press, and store rolls away from heat so the adhesive behaves the same in July as it does in January.

4. PRINT LENGTH 360-900 MM

Print length is the third side of the triangle, and on the Master Series it runs from 360 mm to 900 mm. Print length is the repeat the sleeve turns out in one revolution, so it sets the bag formats the press can produce: a 360 mm repeat covers the short end of FFS heavy-duty pouches, while 900 mm reaches the large-format end of industrial film work. Print length works together with the 800 mm maximum feeding width and 700 mm maximum printing width to frame the printable face of a bag, and with the shift angle of 0-45 degrees when patterns are set at an angle across the web. Specify the longest and shortest bag your range will ever carry, then confirm both ends sit inside 360-900 mm before the sleeve order is placed. A bag that needs a 950 mm repeat is not a plate question - it is a different machine conversation, and finding that out after the sleeve is cut is an expensive way to learn it.

5. SLEEVE MOUNTING AND REGISTRATION

The sleeve is where the data becomes mechanics. The Master Series uses full-servo sleeve drive, so each print deck is positioned and driven independently rather than through a shared mechanical gear train; a quick-change ink chamber and sleeve-based plate mounting shorten the gap between jobs. Because the drive is servo, a sleeve change does not mean re-phasing a gear train - the deck finds its position electronically, which is what makes a short-run schedule practical on a press of this size. Automatic registration control then holds the position once the plates are set, through acceleration and at the full 150 m/min printing speed, instead of letting register drift with each roll change. Roll handling matches the pace: rolls up to a maximum diameter of 1500 mm mount on 6-inch air shafts, with automatic tension held across a 5-20 kg range over the full width. Registration discipline on a servo press is mostly routine: set the plates with the press at operating temperature, sample the first hundred metres for any register movement before running the balance of the roll, and keep the approved sample with the sleeve so the next run starts from a known reference instead of a memory. For a converter running short jobs on FFS heavy-duty film, that combination is the difference between a press that is productive at the speed on its plate and a press that is productive on the jobs that actually arrive.

6. FROM DATA SHEET TO PRINTED ROLL

The numbers close the loop at both ends of the line. Upstream, film arrives from the blown film extrusion machine; downstream, printed rolls move to slitting, where the finished width and tension behaviour are set for the converting line. A plate data sheet that ignores either end creates avoidable work: a film whose gauge wanders will not hold register no matter how well the plate is made, and a printed roll that reaches the slitter out of round becomes trim waste. The full machine specification - feeding width, roll diameter up to 1500 mm on 6-inch air shafts, automatic tension range of 5-20 kg across the full width - is set out on the CI flexo printing machine page. For the next step in the line, see the slitting machine page. XIAOPAI holds the plate and sleeve data as part of the specification package, so a buyer receives one accountable description of what prints on which format, from a supplier that works with long-established Chinese manufacturers rather than building the presses itself.