{"id":13897,"date":"2026-03-30T10:58:04","date_gmt":"2026-03-30T07:58:04","guid":{"rendered":"https:\/\/artha-s.com\/?p=13897"},"modified":"2026-03-30T11:09:28","modified_gmt":"2026-03-30T08:09:28","slug":"printing-on-bopp-film-bright-colors","status":"publish","type":"post","link":"https:\/\/artha-s.com\/en\/printing-on-bopp-film-bright-colors\/","title":{"rendered":"Printing on BOPP film: bright colors, clear text and stable circulation"},"content":{"rendered":"

Printing on BOPP Film: How to Achieve Bright Colors, Readable Text, and Stable Results Throughout the Print Run<\/strong><\/p>\n

Why printing on BOPP sometimes \u201cfails\u201d (and how it shows up)<\/h2>\n

If you have ever run branded film in production, you probably know the symptoms: dull colors, small text that blurs, dirty contours, and instability across the roll. This is exactly what people mean when they say \u201cthe print does not hold\u201d or \u201cit was fine yesterday, but not today.\u201d<\/p>\n

In most cases, the root of the problem is the film surface: the ink does not wet it properly, adhesion is weak, and then a whole chain starts \u2014 smudging \u2192 dusting\/fading \u2192 instability. That is why the first building block of any stable print process is corona treatment + dyne control<\/strong>.<\/p>\n

BOPP for printing: which film to choose for the task<\/a><\/h2>\n

BOPP is a rigid, \u201ccrisp\u201d material with high transparency and gloss, good tear strength, and solid barrier properties. It is used in flexographic printing, lamination, and flexible packaging production, and the typical thickness range for BOPP is 15\u201340 microns<\/strong>.<\/p>\n

To make the right choice, ask yourself 3 simple questions:<\/p>\n

1) Do you need sealed seams?<\/h3>\n

Then you need BOPP with a heat-sealable copolymer layer<\/strong>. This heat-seal layer ensures stable seam sealing during the packaging process (it can be applied to one or both sides).<\/p>\n

2) Do you need the print to \u201chold\u201d?\"\"<\/h3>\n

Then you need BOPP with an activation layer (corona treatment)<\/strong> \u2014 this is what increases surface energy and gives the ink proper adhesion.<\/p>\n

3) Do you need a cone or sheet without sealing?<\/h3>\n

Then BOPP without a heat-seal layer<\/strong> is often used \u2014 it is typically chosen for cone-shaped flower bags and sheets.<\/p>\n

Bonus:<\/strong> in terms of design, BOPP can be transparent \/ white \/ pearlized \/ metallized \/ matte<\/strong> \u2014 and this often creates a more \u201cpremium\u201d look without making printing more complicated.<\/p>\n

Corona treatment and dyne control: the foundation for bright colors and durable printing<\/h2>\n

A simple explanation: corona treatment changes the top layer of the film so the ink wets the surface instead of \u201cbeading up\u201d into droplets. If wetting is poor, adhesion is weak \u2014 and that leads to dusting, rubbing off, and dull, grayish color.<\/p>\n

A practical rule from technical sources: the surface energy of the film should be 7\u201310 dynes\/cm higher than the surface tension of the liquid<\/strong> (ink\/solvent). In the Enercon example, if the ink surface tension is about 30 dynes\/cm<\/strong>, the material should be at least 37\u201340 dynes\/cm<\/strong>, otherwise wetting and adhesion will be insufficient.<\/p>\n

How this is checked in production: a dyne test<\/strong> using dyne pens<\/strong>. Avery Dennison describes a simple approach in its technical bulletin: you draw a line with a dyne pen and see whether it stays continuous \u2014 this is a quick way to check the surface energy level.<\/p>\n

An important warning: the effect of corona treatment can decrease over time, so the discipline of \u201ctest \u2192 print\/laminate\u201d<\/strong> is not bureaucracy \u2014 it is what keeps the print run stable.<\/p>\n

Surface print or reverse print on BOPP: what to choose and when<\/h2>\n

The logic is simple:<\/p>\n

    \n
  • Surface printing<\/strong> \u2014 on the outside surface (fast, simple, but abrasion resistance must be tested).<\/li>\n
  • Reverse printing<\/strong> \u2014 on the inner side, often under lamination, so the ink is \u201clocked in\u201d and becomes more resistant to rubbing and scratches.<\/li>\n<\/ul>\n

    If your packaging experiences a lot of friction in logistics (boxes, conveyors, warehouse handling), reverse printing + lamination<\/strong> often provides a much more stable premium effect with fewer complaints about abrasion.<\/p>\n

    How to get \u201cbright colors\u201d in flexographic printing: a practical block<\/h2>\n

    Here is a short algorithm that really works:<\/p>\n

      \n
    • Surface treatment (corona)<\/strong> is a must. Without it, you will try to \u201csqueeze out\u201d color through machine settings and still end up with instability.<\/li>\n
    • Anilox + ink transfer.<\/strong> The anilox roller and its condition are among the key factors for even ink laydown and solid density.<\/li>\n
    • Ink viscosity \/ feed.<\/strong> If the ink is too \u201cwet,\u201d small text will spread; if it is too \u201cdry,\u201d you will get streaks and dusting.<\/li>\n
    • Substrate \/ visual effects.<\/strong> If you want a more premium look, metallized BOPP<\/strong> or lamination<\/strong> can enhance the visual result \u2014 but only after the base process is stabilized.<\/li>\n<\/ul>\n

      How to make small text readable (without ruining the print run)<\/h2>\n

      Small text is the first thing to suffer \u2014 because of dot gain, excessive pressure, and incorrect ink rheology. So the rule is: first process discipline, then design heroics<\/strong>.<\/p>\n

      What should be agreed with the technologist before launch:<\/p>\n

        \n
      • minimum font size and line thickness (depends on the print configuration, so do not guess);<\/li>\n
      • rules for reverse-out text (white text on a colored background is a risk zone);<\/li>\n
      • no \u201chairline\u201d strokes or tiny QR codes without a test print.<\/li>\n<\/ul>\n

        Stability throughout the print run: what to control at start-up and during production<\/h2>\n

        The most convenient way is in the format: goal \u2192 what affects it \u2192 how we control it<\/strong>.<\/p>\n

        \n
        \n\n\n\n\n\n\n\n
        Goal<\/th>\nWhat affects it<\/th>\nHow we control it<\/th>\n<\/tr>\n<\/thead>\n
        Brightness \/ density<\/td>\ncorona (dyne), anilox, viscosity, drying<\/td>\ndyne test before printing; viscosity control; solid coverage check<\/td>\n<\/tr>\n
        Readable text<\/td>\npressure \/ impression, overly \u201cwet\u201d ink, dot gain<\/td>\ntest prints, approval of minimum font size \/ line thickness<\/td>\n<\/tr>\n
        Stability across the roll<\/td>\ndyne level, anilox cleanliness, color registration<\/td>\nQC checklist at start-up and during the run, registration control<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        \"\"Typical flexographic printing defects on film \u2014 and how to avoid them<\/h2>\n

        Poor adhesion \/ dusting<\/strong> \u2192 cause: low dyne level \/ no corona \u2192 solution: corona treatment + dyne control.<\/p>\n

        Smudging, dirty contour<\/strong> \u2192 cause: too much ink \/ too much pressure \u2192 solution: adjust transfer (anilox), viscosity, and impression.<\/p>\n

        Streaks \/ mottle<\/strong> \u2192 cause: unstable feed \/ anilox \/ drying \u2192 solution: clean anilox + correct drying mode.<\/p>\n

        Color variation across the roll<\/strong> \u2192 cause: drift in ink parameters + unstable surface \u2192 solution: control dyne level and viscosity at start-up and during the run.<\/p>\n

        Artha-S capabilities for printing on BOPP<\/h2>\n

        Artha-S performs roll-to-roll flexographic printing<\/strong> and works with different types of BOPP (with heat-seal layer \/ without heat-seal layer \/ with activation layer).<\/p>\n

        Printing equipment:<\/strong> Flexotechnika Tachys, \u0424\u0414\u0420 850\/6, FPHS-6HS.
        Technical printing parameters:<\/strong> up to 8 colors<\/strong>, material width 300\u20131200 mm<\/strong>.<\/p>\n

        Technical requirements for the artwork<\/h2>\n

        To avoid surprises during the print run, prepare:<\/p>\n

          \n
        • files: AI or PDF<\/strong> (PDF\/X-1a or another agreed format);<\/li>\n
        • colors: CMYK \/ Pantone<\/strong> (to be agreed);<\/li>\n
        • clearly mark transparent areas, solid fills, gradients;<\/li>\n
        • \u201crisk zones\u201d: small white text on color, thin lines, large solid fills \u2014 all of this is best approved through a test print;<\/li>\n
        • important: exact minimum font sizes and line thicknesses depend on the print configuration and are approved before production starts.<\/li>\n<\/ul>\n

          Checklist 1: what to check before launching the print run<\/h2>\n
            \n
          • dyne level \/ presence of corona treatment (quick dyne test)<\/li>\n
          • anilox condition (cleanliness \/ transfer)<\/li>\n
          • ink viscosity and feed stability<\/li>\n
          • impression \/ pressure and test for small text<\/li>\n
          • abrasion test (especially for surface printing)<\/li>\n<\/ul>\n

            Checklist 2: what to prepare for a quotation<\/h2>\n
              \n
            • product and packaging format (roll \/ bag, surface or reverse printing)<\/li>\n
            • BOPP: whether a heat-seal layer is needed; whether corona treatment is needed<\/li>\n
            • film thickness (within 15\u201340 microns<\/strong> for BOPP)<\/li>\n
            • roll width (within 300\u20131200 mm<\/strong>)<\/li>\n
            • number of colors (up to 8<\/strong>) + artwork \/ design idea<\/li>\n
            • print run volume (minimum order quantity for printed film \u2014 from 300 kg<\/strong>)<\/li>\n<\/ul>\n