تعريفات واختصارات هامه
شرح المصطلحات الصناعية مع توضيح تأثيرها على الأعمال (وليس مجرد تعريفات)
GSM (Grams per Square Meter): Why It's Not the Same as Thickness
170 gsm coated ≠ 170 gsm uncoated in caliper. Learn how coating weight affects both printability and structural performance.
Basis Weight vs. Grammage: Converting Between US and Metric Systems
US uses "24 lb bond" while Egypt uses "60 gsm." Get the conversion formula and why it matters for imports.
Caliper: The Measurement That Predicts Scoring Channel Width
Caliper = actual sheet thickness in millimeters. More useful than GSM for finishing specs. Learn how to measure it correctly.
PPI (Pages Per Inch): The Bulk Metric for Bookbinding
High-bulk papers = thicker books with fewer pages. Critical for spine width calculations on perfect-bound work.
Dot Gain: Why Your 50% Screen Prints at 65%
Ink spreads on contact with paper. Dot gain = the difference between file value and printed density. Affects all halftones.
Trapping: The Overlap That Prevents White Gaps
Trapping: The Overlap That Prevents White Gaps
Hickeys: The Spot Defects That Ruin Otherwise Perfect Sheets
Hickeys = doughnut-shaped spots caused by debris on blankets or plates. Learn prevention + on-press removal.
Ghosting: The Shadow Image You Didn't Design
Mechanical ghosting = ink starvation patterns on solids. Chemical ghosting = incomplete drying. Two problems, two solutions.
Makeready: The Hidden Cost in Every Print Job Quote
Makeready = press setup time before saleable sheets. Longer runs spread this cost; short runs suffer. Affects pricing strategy.
Kiss Cut vs. Through Cut: Die-Cutting Depth Control
Kiss cut = cuts label face, not liner. Through cut = full penetration. Wrong depth = wasted material or damaged product.
Set-Off: When Ink Transfers to the Sheet Above It
Freshly printed sheets stacked before drying = ink transfers (set-off). Anti-set spray and delivery timing prevent this.
Color Bars: The Diagnostic Tool Hidden in Your Trim Area
Color bars contain density patches, star targets, and slur gauges. Learn which metrics matter for quality control.
Gripper Margin: The Unprintable 10mm You Must Plan For
Presses grip sheets by one edge—this 10-15mm area can't receive ink. Design files must account for it or content gets cut.
Bleed: Why Your Background Must Extend 3mm Beyond Trim
Guillotine tolerance = ±0.5mm. Without bleed, you risk white edges after trimming. 3mm bleed = insurance against cutting variance.
