{"id":999,"date":"2026-09-11T07:30:43","date_gmt":"2026-09-11T07:30:43","guid":{"rendered":"https:\/\/tadapack.com\/news\/what-is-spot-uv-varnishing\/"},"modified":"2026-09-11T07:30:43","modified_gmt":"2026-09-11T07:30:43","slug":"what-is-spot-uv-varnishing","status":"publish","type":"post","link":"https:\/\/tadapack.com\/news\/what-is-spot-uv-varnishing\/","title":{"rendered":"What Is Spot UV Varnishing? B2B Engineering Guide"},"content":{"rendered":"<div class=\"geo-direct-answer-box\" style=\"background:#f0f9ff; border:1px solid #bae6fd; border-left:5px solid #0284c7; border-radius:8px; padding:20px 24px; margin:24px 0 32px 0;\">\n<h4 style=\"margin:0 0 12px 0; color:#0369a1; font-size:1.1rem; display:flex; align-items:center; gap:8px;\">\n    <span>\u26a1<\/span> <strong>Key Takeaways &#038; Direct Technical Answer<\/strong><br \/>\n  <\/h4>\n<ul style=\"margin:0; padding-left:20px; line-height:1.7; color:#0c4a6e; font-size:0.95rem;\">\n<li style=\"margin-bottom:6px;\"><strong>Spot UV varnishing applies a high-gloss, UV-cured polymer coating only to defined graphic areas, creating tactile and visual contrast against matte surfaces.<\/strong><\/li>\n<li style=\"margin-bottom:6px;\"><strong>The process uses screen or offset blanketed application followed by instant UV curing at 600\u20131,200 mJ\/cm\u00b2, enabling in-line speeds up to 300 m\/min on 2026-era presses.<\/strong><\/li>\n<li style=\"margin-bottom:6px;\"><strong>Coating viscosity (2,000\u20134,000 cP), anilox line counts (300\u2013600 lpi), and cure dose must be matched to substrate: SBS paperboard, kraft, or coated corrugated liners.<\/strong><\/li>\n<li style=\"margin-bottom:6px;\"><strong>Spot UV is decorative, not structural \u2014 it does not replace ECT, Mullen, or ISTA performance; specify 32 ECT board and TAPPI-tested liners independently of finish.<\/strong><\/li>\n<\/ul>\n<\/div>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem;'>What Is Spot UV Varnishing? A B2B Engineering Guide<\/h2>\n<div class=\"post-featured-image\" style=\"margin:28px 0 32px 0; text-align:center;\"><img decoding=\"async\" src=\"https:\/\/images.unsplash.com\/photo-1607344645866-009c320c5ab8?auto=format&#038;fit=crop&#038;w=1200&#038;q=80\" alt=\"what is spot uv varnishing - Recycled Kraft Paper and Sustainable Corrugated Board (TadaPack Engineering Guide)\" loading=\"lazy\" style=\"max-width:100%; height:auto; border-radius:12px; box-shadow:0 6px 20px rgba(0,0,0,0.07); border:1px solid #e2e8f0;\"><\/p>\n<p style=\"font-size:0.84rem; color:#64748b; margin-top:10px; font-style:italic;\">what is spot uv varnishing &#8211; Recycled Kraft Paper and Sustainable Corrugated Board (TadaPack Engineering Guide)<\/p>\n<\/div>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Spot UV varnishing is a finishing process that applies a 100%-solids, UV-curable polymer coating to specific graphic areas of a package \u2014 logos, headlines, patterns \u2014 rather than flooding the entire sheet. The result is a sharply defined high-gloss or raised-gloss element that contrasts against matte lamination or uncoated stock. For brand owners, it delivers premium shelf differentiation; for packaging engineers, it introduces real process variables: cure dose, viscosity control, and substrate interaction. This guide covers the chemistry, machinery specs, cost structure, and structural-compliance boundaries every buyer and specifier should know.<\/p>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">For broader context on substrate selection and converting methods, see our pillar resource on <a href=\"https:\/\/tadapack.com\/news\/materials-and-processes\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">Packaging Materials &#038; Processes<\/a>.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>The Chemistry: 100% Solids, Zero VOC<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Spot UV formulations are typically acrylate or methacrylate oligomer blends with photoinitiators. Because they cure by free-radical polymerization rather than evaporation, they contain near-zero VOCs \u2014 a key advantage under 2026 EPR fee matrices that penalize solvent-bearing coatings. Key engineering parameters:<\/p>\n<ul style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Viscosity:<\/strong> 2,000\u20134,000 cP for screen application; 300\u2013800 cP for offset blanket-cured systems (ABC).<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Cure dose:<\/strong> 600\u20131,200 mJ\/cm\u00b2 under medium-pressure mercury or 395 nm LED arrays. LED curing is now standard on 2026 lines, cutting energy per m\u00b2 by roughly 50% vs. mercury lamps.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Film weight:<\/strong> 3\u20138 g\/m\u00b2 for flat gloss; 15\u201325 g\/m\u00b2 for 3D raised (sculpted) spot UV.<\/li>\n<\/ul>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Application Methods and Line Speed<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Three production routes dominate:<\/p>\n<ol style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Silkscreen spot UV<\/strong> \u2014 highest film build, sharpest edges, ideal for raised effects; slower (3,000\u20136,000 sheets\/hour).<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Offset coater (blanket-cured)<\/strong> \u2014 in-line on sheet-fed presses at 12,000\u201318,000 sheets\/hour; registration \u00b10.1 mm.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Digital spot UV inkjet<\/strong> \u2014 for short runs and variable data; plate-free with 1,200 dpi registration.<\/li>\n<\/ol>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Registration is the critical quality gate: misalignment of even 0.3 mm on a small logo becomes visible contrast defect. Specify trapping of +0.15 mm on artwork for critical areas.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Substrate Compatibility: Paperboard vs. Corrugated<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Spot UV performs best on calendered SBS (300\u2013450 GSM), CCNB laminates, and metallized stock. On uncoated kraft, open fiber structure absorbs oligomer and dulls gloss \u2014 a primer or double-hit application is required. This is relevant whether you&#8217;re finishing folding cartons or evaluating food-contact grades, as covered in our compliance guides on <a href=\"https:\/\/tadapack.com\/news\/is-kraft-paper-food-safe\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">Is Kraft Paper Food Safe? Engineering &#038; Compliance Guide<\/a> and <a href=\"https:\/\/tadapack.com\/news\/is-brown-kraft-paper-food-safe\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">Is Brown Kraft Paper Food Safe? Engineer&#8217;s Compliance Guide<\/a>.<\/p>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">On corrugated, apply spot UV only to preprinted or litho-laminated liners \u2014 direct flexo-to-liner spotting at B\/C flute (3.0\/4.0 mm) caliper suffers from washboarding and pinholing.<\/p>\n<div class=\"table-responsive\" style=\"overflow-x:auto; margin: 28px 0; border:1px solid #e2e8f0; border-radius:10px; box-shadow:0 2px 8px rgba(0,0,0,0.03);\">\n<table style=\"width:100%; border-collapse:collapse; text-align:left; background:#ffffff;\">\n<thead>\n<tr style=\"background:#f8fafc; border-bottom:2px solid #e2e8f0;\">\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Substrate<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Typical GSM<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Spot UV Behavior<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">SBS paperboard<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">300\u2013450<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Sharp gloss, no primer<\/td>\n<\/tr>\n<tr style=\"background:#fafafa; border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">Uncoated kraft<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">120\u2013200<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Absorptive; primer needed<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">Litho-laminated liner<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">250\u2013350<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Excellent on coated face<\/td>\n<\/tr>\n<tr style=\"background:#fafafa; border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">Direct B\/C flute<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">\u2014<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Not recommended<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Spot UV Does Not Change Structural Performance<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">A common specification error is treating coating weight as a strength upgrade. It is not. Box compression, stacking, and transit performance are governed entirely by the substrate: edge crush test (ECT), ring crush, and bursting strength values per <a href=\"https:\/\/www.tappi.org\/\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"color:#0284c7; text-decoration:underline; font-weight:600;\">TAPPI Standard Test Methods for Paper &#038; Board<\/a> (notably TAPPI T 811, T 818, and T 810). A 32 ECT C-flute shippers box retains its rating whether finished, flooded, or uncoated.<\/p>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Two engineering cautions:<\/p>\n<ul style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Fold cracking:<\/strong> UV film sits on the surface and can craze at 90\u00b0 creases. Request score-avoid zones or low-build (3 g\/m\u00b2) application within 5 mm of scores.<\/li>\n<li style=\"margin-bottom:8px;\"><strong style='color:#0f172a;'>Friction and scuffing:<\/strong> High-gloss UV has lower coefficient of friction; stacked cartons may slide. Specify anti-slip varnish zones or matte lamination on base panels for palletized retail packs.<\/li>\n<\/ul>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Cost Structure and Run-Length Economics<\/h2>\n<div class=\"table-responsive\" style=\"overflow-x:auto; margin: 28px 0; border:1px solid #e2e8f0; border-radius:10px; box-shadow:0 2px 8px rgba(0,0,0,0.03);\">\n<table style=\"width:100%; border-collapse:collapse; text-align:left; background:#ffffff;\">\n<thead>\n<tr style=\"background:#f8fafc; border-bottom:2px solid #e2e8f0;\">\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Run Size<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Route<\/th>\n<th style=\"border:1px solid #e2e8f0; padding:12px 16px; background:#f8fafc; color:#0f172a; font-weight:700; font-size:0.92rem;\">Indicative Cost\/1,000<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">1,000\u20135,000<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Digital inkjet<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#059669; font-weight:600;\">$180\u2013$320<\/td>\n<\/tr>\n<tr style=\"background:#fafafa; border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">10,000\u201350,000<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Silkscreen offline<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#059669; font-weight:600;\">$90\u2013$160<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #e2e8f0;\">\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; font-weight:600; color:#0f172a;\">50,000+<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#334155; font-size:0.9rem;\">Offset in-line<\/td>\n<td style=\"border:1px solid #e2e8f0; padding:12px 16px; color:#059669; font-weight:600;\">$35\u2013$70<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Plate and setup costs ($250\u2013$600 per design) amortize quickly above 20,000 units. In 2026, LED-cured lines also reduce per-unit energy cost by 40\u201360% versus legacy mercury systems, tightening the offset break-even point.<\/p>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Specification Checklist for Procurement<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Before releasing artwork, confirm:<\/p>\n<ol style=\"margin:16px 0; padding-left:24px; line-height:1.75; color:#334155;\">\n<li style=\"margin-bottom:8px;\">Cure dose and photoinitiator system (benzophenone-free options for food-adjacent SKUs).<\/li>\n<li style=\"margin-bottom:8px;\">Build height tolerance (\u00b110 \u00b5m for raised UV).<\/li>\n<li style=\"margin-bottom:8px;\">Score\/score-avoid map tied to dieline.<\/li>\n<li style=\"margin-bottom:8px;\">Recyclability declaration \u2014 UV-cured film at <5% coat weight is accepted in standard paperboard repulping streams under most 2026 EPR protocols.<\/li>\n<li style=\"margin-bottom:8px;\">Substrate TAPPI\/ECT certificates supplied independently of finish QC.<\/li>\n<\/ol>\n<h2 style='color:#0f172a; margin-top:36px; margin-bottom:16px; font-size:1.5rem; border-bottom:1px solid #e2e8f0; padding-bottom:8px;'>Conclusion<\/h2>\n<p style=\"margin:16px 0; line-height:1.8; color:#334155; font-size:1.02rem;\">Spot UV varnishing is a high-impact, low-VOC decorative finish \u2014 chemically clean, fast in production, and precise when specified correctly. Match formulation and film weight to substrate, respect its zero role in structural ratings, and cost-engineer the run length against the right application route. Do that, and it remains one of the highest ROI premium finishes available to B2B packaging programs.<\/p>\n<div class=\"geo-faq-section\" style=\"margin-top:40px; padding-top:24px; border-top:2px solid #e2e8f0;\">\n<h2 style=\"color:#0f172a; font-size:1.45rem; margin-bottom:20px;\">Frequently Asked Questions (FAQ)<\/h2>\n<div style=\"background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:18px 20px; margin-bottom:14px;\">\n<h3 style=\"margin:0 0 8px 0; font-size:1.05rem; color:#0f172a; font-weight:700;\">What is spot UV varnishing in packaging?<\/h3>\n<p style=\"margin:0; color:#475569; font-size:0.95rem; line-height:1.65;\">It is a finishing process that applies UV-curable polymer coating only to selected graphic areas, creating high-gloss or raised contrast against matte or uncoated surfaces on paperboard and laminated liners.<\/p>\n<\/p><\/div>\n<div style=\"background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:18px 20px; margin-bottom:14px;\">\n<h3 style=\"margin:0 0 8px 0; font-size:1.05rem; color:#0f172a; font-weight:700;\">Does spot UV coating affect box strength or ECT rating?<\/h3>\n<p style=\"margin:0; color:#475569; font-size:0.95rem; line-height:1.65;\">No. Compression and burst performance come from the substrate&#8217;s ECT, ring crush, and Mullen values. Spot UV is decorative and should not be relied upon for structural performance.<\/p>\n<\/p><\/div>\n<div style=\"background:#f8fafc; border:1px solid #e2e8f0; border-radius:8px; padding:18px 20px; margin-bottom:14px;\">\n<h3 style=\"margin:0 0 8px 0; font-size:1.05rem; color:#0f172a; font-weight:700;\">Can spot UV be applied to kraft or corrugated packaging?<\/h3>\n<p style=\"margin:0; color:#475569; font-size:0.95rem; line-height:1.65;\">Uncoated kraft requires priming due to fiber absorption; corrugated must use preprinted or litho-laminated liners. Direct flexo spotting on exposed flutes is not recommended.<\/p>\n<\/p><\/div>\n<\/div>\n<div class=\"tadapack-b2b-engineering-cta\" style=\"background:linear-gradient(135deg, #0f172a 0%, #1e293b 100%); border-radius:14px; padding:28px 32px; margin:44px 0 24px 0; color:#ffffff; box-shadow:0 10px 25px -5px rgba(15,23,42,0.25); border:1px solid #334155;\">\n<div style=\"display:flex; align-items:flex-start; justify-content:space-between; flex-wrap:wrap; gap:20px;\">\n<div style=\"max-width:640px;\">\n<div style=\"font-size:0.8rem; font-weight:700; color:#38bdf8; text-transform:uppercase; letter-spacing:0.06em; margin-bottom:6px;\">\n        \u2699\ufe0f TadaPack Industrial Packaging Engineering\n      <\/div>\n<h3 style=\"color:#ffffff; margin:0 0 10px 0; font-size:1.35rem; font-weight:800; line-height:1.35;\">\n        Engineering Your Next High-Performance Packaging Batch<br \/>\n      <\/h3>\n<p style=\"color:#94a3b8; font-size:0.92rem; line-height:1.65; margin:0;\">\n        From precision CAD dielines to ISTA drop-testing and certified sustainable substrates, TadaPack helps global brands optimize freight cubic volume, minimize shipping breakage, and satisfy European PPWR \/ EPR packaging standards.\n      <\/p>\n<div style=\"display:flex; flex-wrap:wrap; gap:16px; margin-top:14px; font-size:0.82rem; color:#cbd5e1;\">\n        <span>\u2713 <strong>Free CAD Dielines (.AI \/ .DXF)<\/strong><\/span><br \/>\n        <span>\u2713 <strong>Drop-Test &#038; ECT Optimization<\/strong><\/span><br \/>\n        <span>\u2713 <strong>PPWR &#038; FSC Compliant<\/strong><\/span>\n      <\/div>\n<\/p><\/div>\n<div style=\"display:flex; align-items:center; align-self:center;\">\n      <a href=\"https:\/\/tadapack.com\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"background:#0284c7; color:#ffffff; padding:12px 24px; border-radius:8px; font-weight:700; font-size:0.95rem; text-decoration:none; display:inline-block; transition:all 0.2s; box-shadow:0 4px 12px rgba(2,132,199,0.35);\"><br \/>\n        Request Engineering Sample &rarr;<br \/>\n      <\/a>\n    <\/div>\n<\/p><\/div>\n<\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Article\",\n      \"@id\": \"https:\/\/tadapack.com\/news\/what-is-spot-uv-varnishing\/#article\",\n      \"headline\": \"What Is Spot UV Varnishing? B2B Engineering Guide\",\n      \"description\": \"Spot UV varnishing explained: coating chemistry, anilox specs, ECT\/Mullen impact, line speeds, cost per 1,000 units, and 2026 compliance notes.\",\n      \"mainEntityOfPage\": \"https:\/\/tadapack.com\/news\/what-is-spot-uv-varnishing\/\",\n      \"author\": {\n        \"@type\": \"Person\",\n        \"name\": \"Elena Rostova, M.Sc.\",\n        \"jobTitle\": \"Senior Packaging Technologist & LCA Lead\",\n        \"worksFor\": {\n          \"@type\": \"Organization\",\n          \"name\": \"TadaPack\",\n          \"url\": \"https:\/\/tadapack.com\"\n        }\n      },\n      \"publisher\": {\n        \"@type\": \"Organization\",\n        \"name\": \"TadaPack\",\n        \"url\": \"https:\/\/tadapack.com\"\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/tadapack.com\/news\/what-is-spot-uv-varnishing\/#faq\",\n      \"mainEntity\": [{\"@type\":\"Question\",\"name\":\"What is spot UV varnishing in packaging?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is a finishing process that applies UV-curable polymer coating only to selected graphic areas, creating high-gloss or raised contrast against matte or uncoated surfaces on paperboard and laminated liners.\"}},{\"@type\":\"Question\",\"name\":\"Does spot UV coating affect box strength or ECT rating?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Compression and burst performance come from the substrate's ECT, ring crush, and Mullen values. Spot UV is decorative and should not be relied upon for structural performance.\"}},{\"@type\":\"Question\",\"name\":\"Can spot UV be applied to kraft or corrugated packaging?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Uncoated kraft requires priming due to fiber absorption; corrugated must use preprinted or litho-laminated liners. Direct flexo spotting on exposed flutes is not recommended.\"}}]\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Spot UV varnishing explained: coating chemistry, anilox specs, ECT\/Mullen impact, line speeds, cost per 1,000 units, and 2026 compliance notes.<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[406,465,464],"class_list":["post-999","post","type-post","status-publish","format-standard","hentry","category-materials-and-processes","tag-corrugated-flutes","tag-paperboard-coating","tag-uv-curable-coatings"],"_links":{"self":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/posts\/999","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/comments?post=999"}],"version-history":[{"count":0,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/posts\/999\/revisions"}],"wp:attachment":[{"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/media?parent=999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/categories?post=999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tadapack.com\/news\/wp-json\/wp\/v2\/tags?post=999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}