Printing Knowledge

Two printed sheets can look like an exact color match at the printer's bench and clearly different when checked in a client's office. The paper has not changed, and the ink has not changed. What changed is the light. Human color judgment depends heavily on the conditions around the object being v...…

Name Thickness/mm Name Thickness/mm
80gsm art paper 0.065 105gsm matt coated paper 0.09
105gsm art paper 0.085 128gsm matt coated paper 0.12
128gsm art paper 0.105 157gsm matt coated paper 0.16
157gsm art paper 0.135 200gsm matt coated paper 0.19
200gsm art paper 0.17 210gsm matt coated paper 0.21
210gsm art paper 0.19 230gsm matt coated paper 0.23…

An uneven delivery pile shows up long before anyone counts the sheets. The stack leans to one side, corners arrive turned over, and the jogging blades scrape across the top sheet instead of guiding it. In the bindery the same stack has to be re-sorted by hand, and the count for the run stops matc...…

A color print job rarely fails in one dramatic moment. It drifts. A tone shifts half a step on Tuesday, a reprint arrives a shade warmer than the first delivery, and a buyer ends up comparing two cartons under office lighting and asking hard questions. Fair judgment of printed color depends less...…

A proof is the last chance to catch a problem before a full run commits paper, ink and press time. For a publisher or a brand owner it is also the sheet that gets signed, and once that signature is in place the printer is expected to deliver work that matches it. Digital proofing has made the ste...…

Pressure-sensitive label stock is a laminated material built from three visible parts: a face stock that carries the printed design, an adhesive layer, and a siliconized release liner. Because the adhesive is already part of the construction, the label needs no glue pot, no water, and no drying t...…

Metallized gold and silver board, along with holographic laser board, was long printed with conventional offset inks that dry by oxidation. Those inks need hours before a sheet can be handled, and the wait shows up on the floor as set-off, scuffing on the printed face, extra interleaving, extra h...…

Thin paper behaves differently from the 100 to 350 gsm stock most offset shops handle every day. Sheets flex under the suction heads, pick up curl at the delivery, and drift out of register at speeds that feel normal for board. The press rarely needs new parts to cope with thin stock. It needs th...…

A full-tone solid that prints light in patches is one of the more stubborn complaints on a sheet-fed press. The first reaction in most shops is to raise printing pressure, and when that changes nothing, the job goes onto better paper. The paper swap usually works, but it lifts cost and pushes the...…

The sheet feeder sits at the front of every sheet-fed offset press, and its condition sets a ceiling on both running speed and register accuracy. It has to lift one sheet at a time, separate it cleanly, carry it to the front guides and hand it to the transfer grippers without a stumble. In shops...…

Moving an offset press to an alcohol-free fountain solution is not a simple additive swap. The dampening unit, the ink train and the daily habits of the crew all change at the same time. Shops that treat the switch as a chemistry drop-in usually spend the next months fighting scumming, ink buildi...…

Misregistration on a web offset press is usually a symptom, not a single fault. Colour drifts out of position because something upstream has changed the length of the paper path or the geometry of the plate and blanket package. On roll fed presses four causes account for most of the cases we see...…

On a sheet-fed offset press the plate cylinder, the blanket cylinder and the impression cylinder carry the image, transfer the ink and press the sheet against the blanket. How those cylinders are supported at each end decides whether printing pressure stays even from one side of the sheet to the...…

Grain direction is one of the first things an experienced press operator checks on a new paper delivery. It affects how the sheet feeds, how it registers through each unit, and whether the finished product stays flat after folding or labeling. Two papers of identical weight and finish can behave...…

Page numbers are settled long before a plate is imaged. They follow from the binding method, the page size of the book and the number of folds a printed sheet takes on its way to becoming a signature. Plan that arrangement badly and the press can run without a single fault while the bindery ends...…

Most CTP faults become visible at the plate, yet their causes sit earlier in the chain: in the file, in exposure energy, or in the processor chemistry. An operator who reads the plate carefully can usually tell which of the three is responsible before a single sheet reaches the press. The notes b...…

Every summer, deinked pulp mills in the northern hemisphere watch brightness fall without any obvious change in raw material or process settings. The cause often sits in the waste paper itself, in the way printing ink ages before the bales ever reach the pulper. Papermakers know this pattern as t...…

Pinholes in a coated tinplate sheet rarely come from a single fault. On a roller coater line, small crater-like spots can appear in the white coating even when every setting looks correct, and the usual reaction is to blame the coating batch. In most cases the cause sits in one of five variables:...…

Offset printing separates itself from other methods by one basic physical fact: ink and water do not mix. The same water that makes the process practical is also the hardest part of the run to keep under control. When the operator manages water well, the press runs smoothly and print quality is far…

Pale, washed-out color on a flexographic press seldom means the artwork is wrong. In most cases the ink arrives at the substrate in a thinner layer than the job needs, or the ink has lost strength before it gets that far. Flexo transfers ink from an anilox roller through a photopolymer plate, so...…