{"id":5417,"date":"2026-09-14T09:28:16","date_gmt":"2026-09-14T09:28:16","guid":{"rendered":"https:\/\/wolorin.com\/?p=5417"},"modified":"2026-09-14T09:28:16","modified_gmt":"2026-09-14T09:28:16","slug":"gravure-cross-web-density-variation","status":"publish","type":"post","link":"https:\/\/wolorin.com\/es\/blog\/gravure-cross-web-density-variation\/","title":{"rendered":"Gravure Cross-Web Density Variation"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"5417\" class=\"elementor elementor-5417\">\n\t\t\t\t<div class=\"elementor-element elementor-element-68c2f e-flex e-con-boxed e-con e-parent\" data-id=\"68c2f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-6641bb96 e-con-full e-flex e-con e-child\" data-id=\"6641bb96\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-7aa54c9c e-con-full e-flex e-con e-child\" data-id=\"7aa54c9c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-719f9b20 elementor-widget elementor-widget-heading\" data-id=\"719f9b20\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Gravure Cross-Web Density Variation<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6326ce70 e-con-full e-flex e-con e-child\" data-id=\"6326ce70\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-7e95fe06 e-con-full e-flex e-con e-child\" data-id=\"7e95fe06\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-14c0f373 elementor-widget elementor-widget-text-editor\" data-id=\"14c0f373\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>When one gravure color prints lighter at both edges, darker through the center, weak on one side, or shows a fixed band across the web, the first useful clue is where that density difference sits across the width. Measure the same image area at fixed positions from left to right and keep the print unit, substrate roll, line speed, and impression setting with the sample.<\/p><p>Then watch what the pattern follows. If it stays with one print unit, keep checking ink transfer, the gravure cylinder, doctoring, and that unit\u2019s impression condition. If it follows a substrate roll, look at the material. If the same weak or heavy area stays at the same machine-width position through those comparisons and reacts repeatedly to impression changes, the impression roll and cross-web contact distribution deserve a closer look.<\/p><p>For roller positions used around gravure impression contact and web handling,\u00a0<a href=\"https:\/\/wolorin.com\/es\/applications\/printing-industry-rollers\/\">Rodillos para la industria de impresi\u00f3n<\/a>\u00a0provides the broader application background.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7d851a9c e-con-full e-flex e-con e-child\" data-id=\"7d851a9c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3aed5518 elementor-widget elementor-widget-image\" data-id=\"3aed5518\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/wolorin.com\/wp-content\/uploads\/2026\/05\/Black-Rubber-Coating-Roller-Set-1.webp\" class=\"attachment-large size-large wp-image-4121\" alt=\"Black rubber coating rollers with machined steel shaft ends\" srcset=\"https:\/\/wolorin.com\/wp-content\/uploads\/2026\/05\/Black-Rubber-Coating-Roller-Set-1.webp 800w, https:\/\/wolorin.com\/wp-content\/uploads\/2026\/05\/Black-Rubber-Coating-Roller-Set-1-300x225.webp 300w, https:\/\/wolorin.com\/wp-content\/uploads\/2026\/05\/Black-Rubber-Coating-Roller-Set-1-768x576.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"  title=\"Gravure Cross-Web Density Variation\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b8bd273 e-flex e-con-boxed e-con e-parent\" data-id=\"b8bd273\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9542062 elementor-widget elementor-widget-html\" data-id=\"9542062\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\n.wl-a11{font-family:Inter,Arial,sans-serif;color:#2f3f50;font-size:16px;line-height:1.72;background:#fff}.wl-a11 *{box-sizing:border-box}.wl-a11 .wl-wrap{max-width:1180px;margin:0 auto;padding:58px 42px}.wl-a11 h1,.wl-a11 h2,.wl-a11 h3{color:#153a63;margin:0 0 20px;line-height:1.16}.wl-a11 h1{font-size:42px;font-weight:700}.wl-a11 h2{font-size:32px;font-weight:700;padding-top:8px}.wl-a11 h2+*{margin-top:0}.wl-a11 h3{font-size:22px;font-weight:700;margin-top:34px}.wl-a11 p{margin:0 0 18px}.wl-a11 ul,.wl-a11 ol{margin:0 0 22px;padding-left:24px}.wl-a11 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#dde5ec;border-radius:12px;padding:14px}.wl-a11 .wl-hero img{width:100%;aspect-ratio:4\/3;object-fit:cover;border-radius:8px;display:block}.wl-a11 .wl-section{border-top:1px solid #edf1f4}.wl-a11 .wl-section h2:not(:first-child){margin-top:58px;padding-top:42px;border-top:1px solid #edf1f4}.wl-a11 .wl-cta{background:#f4f6f8}.wl-a11 .wl-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}.wl-a11 .wl-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 22px;border-radius:6px;background:#f4b938;color:#153a63!important;font-weight:700}.wl-a11 .wl-btn:nth-child(even){background:#fff;border:1px solid #cfd9e3}.wl-a11 .wl-btn:hover{background:#153a63;color:#fff!important}\n@media(max-width:767px){.wl-a11 .wl-wrap{padding:38px 22px}.wl-a11 .wl-hero{grid-template-columns:1fr}.wl-a11 h1{font-size:33px}.wl-a11 h2{font-size:27px}.wl-a11 h3{font-size:21px}.wl-a11 .wl-hero-media{order:2}.wl-a11 .wl-section h2:not(:first-child){margin-top:42px;padding-top:32px}}\n<\/style><article class=\"wl-a11\"><div class=\"wl-wrap wl-section\"><h2 id=\"map-the-density-from-left-edge-to-right-edge\">Map the Density\nfrom Left Edge to Right Edge<\/h2>\n<p>\u201cLight at the edge\u201d describes what the operator sees, but it is still\ntoo broad for troubleshooting. Fix the measurement positions before\nchanging the press. Left, center, and right are a practical starting\npoint. If a visible band sits between them, add readings inside the band\nand immediately beside it.<\/p>\n<p>Use the same solid, tonal patch, or repeatable image area at every\nposition. Take the readings close together in time. If the left side is\nmeasured on a solid and the right side on another tonal area several\nminutes later, normal changes in ink condition can distort the\ncomparison.<\/p>\n<h3 id=\"a-simple-cross-web-record\">A Simple Cross-Web Record<\/h3>\n<div class=\"wl-table\"><table>\n<thead>\n<tr class=\"header\">\n<th>Where to measure<\/th>\n<th>Qu\u00e9 grabar<\/th>\n<th>Keep with the sample<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"odd\">\n<td>Left side<\/td>\n<td>Density or gray value and distance from the reference edge<\/td>\n<td>Print unit and color<\/td>\n<\/tr>\n<tr class=\"even\">\n<td>Center<\/td>\n<td>Density or gray value<\/td>\n<td>Substrate type, thickness, roll or lot<\/td>\n<\/tr>\n<tr class=\"odd\">\n<td>Right side<\/td>\n<td>Density or gray value and position across the web<\/td>\n<td>Line speed and impression setting<\/td>\n<\/tr>\n<tr class=\"even\">\n<td>Visible band<\/td>\n<td>Reading inside the band and readings beside it<\/td>\n<td>Web width and sampling time<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>The individual numbers matter less than the shape they form. For\nexample, left \/ center \/ right readings of 1.42 \/ 1.51 \/ 1.43 form a\nroughly symmetric center-heavy profile. Readings of 1.40 \/ 1.48 \/ 1.50\nshow a different problem because density is rising toward one side.\nThese figures are only examples of profile shape; the approved print\ntarget for the actual job remains the quality reference.<\/p>\n<p>Keep using the same measurement positions during later trials. A\nfixed band is much easier to trace when its position is always recorded\nfrom the same reference edge.<\/p>\n\n<h2 id=\"read-the-shape-before-changing-the-impression-roll\">Read the\nShape Before Changing the Impression Roll<\/h2>\n<h3 id=\"both-edges-are-light-and-the-center-is-darker\">Both Edges Are\nLight and the Center Is Darker<\/h3>\n<p>When both edges are lighter by a similar amount, compare other colors\non the same substrate first.<\/p>\n<p>If several print units show a similar edge-to-center shape, inspect\nconditions shared by those units. Cross-web differences in substrate\nthickness, compressibility, coating, treatment, or surface condition can\nchange how evenly the material enters impression contact.<\/p>\n<p>If only one color shows the problem, stay with that unit. Ink\ncondition and circulation, the gravure cylinder, doctor blade contact,\ncontamination, and the unit\u2019s impression condition are more useful\nchecks at this stage.<\/p>\n<p>When those comparisons leave the same symmetric profile in place and\nimpression adjustment repeatedly makes the center-to-edge difference\nstronger or weaker, the loaded profile of the impression roll becomes\nmore relevant.<\/p>\n<h3 id=\"one-side-stays-lighter\">One Side Stays Lighter<\/h3>\n<p>For a one-sided problem, track the weak side through each controlled\nchange.<\/p>\n<p>If changing the substrate roll moves or removes the weak side,\ninspect the material profile. Thickness, coating, treatment, and\ncompressibility can vary across the width even when two rolls carry the\nsame nominal specification.<\/p>\n<p>If several substrate rolls give the same result on one print unit,\nmove back to that unit. Check the cylinder, doctoring, ink delivery, and\nlateral impression condition.<\/p>\n<p>If different substrates and different cylinders still leave the\noperator side or drive side consistently weak, the machine-side geometry\ndeserves attention. Parallelism, loading at the two ends, bearings,\nshaft support, and the impression roll then belong in the same\nmechanical check.<\/p>\n<h3 id=\"a-band-stays-at-the-same-width-position\">A Band Stays at the\nSame Width Position<\/h3>\n<p>A fixed band gives you an exact axial position to follow. Record its\ndistance from one reference edge.<\/p>\n<p>Suppose a darker band stays 300 mm from the operator-side edge after\na substrate change and remains at the same position after changing the\ngravure cylinder. The fixed position is now more useful than the\ndescription \u201cpressure band.\u201d It tells you where to inspect the contact\nsystem.<\/p>\n<p>Useful checks at that axial position include local outside diameter,\ncover condition, hardness consistency, grinding profile, loading, and\nnearby mechanical support.<\/p>\n<p>If the band moves with another substrate roll, stay with the\nmaterial. If it disappears with another cylinder or print job, continue\non the print-unit side.<\/p>\n<p>Scattered missing dots belong to another gravure-transfer problem. <a\nhref=\"https:\/\/wolorin.com\/es\/blog\/gravure-missing-dots-ink-transfer\/\">Gravure\nMissing Dots: Ink Transfer Checks<\/a> covers that defect separately.<\/p>\n<p>If a mark repeats at a regular pitch along the machine direction\nrather than staying in one cross-web position, compare the repeat\ndistance with rotating components. <a\nhref=\"https:\/\/wolorin.com\/es\/blog\/repeat-marks-web-materials\/\">Why Repeat\nMarks Appear on Web Materials<\/a> covers that pattern.<\/p>\n<\/div><\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8bfefc5 elementor-widget elementor-widget-html\" data-id=\"8bfefc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\n.wl-a11{font-family:Inter,Arial,sans-serif;color:#2f3f50;font-size:16px;line-height:1.72;background:#fff}.wl-a11 *{box-sizing:border-box}.wl-a11 .wl-wrap{max-width:1180px;margin:0 auto;padding:58px 42px}.wl-a11 h1,.wl-a11 h2,.wl-a11 h3{color:#153a63;margin:0 0 20px;line-height:1.16}.wl-a11 h1{font-size:42px;font-weight:700}.wl-a11 h2{font-size:32px;font-weight:700;padding-top:8px}.wl-a11 h2+*{margin-top:0}.wl-a11 h3{font-size:22px;font-weight:700;margin-top:34px}.wl-a11 p{margin:0 0 18px}.wl-a11 ul,.wl-a11 ol{margin:0 0 22px;padding-left:24px}.wl-a11 li{margin:7px 0}.wl-a11 a{color:#1565c0;text-decoration:none}.wl-a11 a:hover{color:#f4b938}.wl-a11 strong{font-weight:700;color:#243c55}.wl-a11 .wl-table{overflow-x:auto;margin:26px 0 30px;border:1px solid #dde5ec;border-radius:10px}.wl-a11 table{width:100%;border-collapse:collapse;min-width:680px}.wl-a11 th{background:#153a63;color:#fff;font-weight:700;text-align:left}.wl-a11 th,.wl-a11 td{padding:13px 15px;border:1px solid #dde5ec;vertical-align:top}.wl-a11 tbody tr:nth-child(even){background:#f7f9fb}.wl-a11 blockquote{margin:24px 0;padding:18px 22px;border-left:4px solid #f4b938;background:#f6f8fa}.wl-a11 pre{white-space:pre-wrap;background:#153a63;color:#fff;padding:22px;border-radius:10px;overflow:auto}.wl-a11 code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.wl-a11 .wl-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:42px;align-items:center;background:#f5f7f9}.wl-a11 .wl-hero-media{background:#fff;border:1px solid #dde5ec;border-radius:12px;padding:14px}.wl-a11 .wl-hero img{width:100%;aspect-ratio:4\/3;object-fit:cover;border-radius:8px;display:block}.wl-a11 .wl-section{border-top:1px solid #edf1f4}.wl-a11 .wl-section h2:not(:first-child){margin-top:58px;padding-top:42px;border-top:1px solid #edf1f4}.wl-a11 .wl-cta{background:#f4f6f8}.wl-a11 .wl-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}.wl-a11 .wl-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 22px;border-radius:6px;background:#f4b938;color:#153a63!important;font-weight:700}.wl-a11 .wl-btn:nth-child(even){background:#fff;border:1px solid #cfd9e3}.wl-a11 .wl-btn:hover{background:#153a63;color:#fff!important}\n@media(max-width:767px){.wl-a11 .wl-wrap{padding:38px 22px}.wl-a11 .wl-hero{grid-template-columns:1fr}.wl-a11 h1{font-size:33px}.wl-a11 h2{font-size:27px}.wl-a11 h3{font-size:21px}.wl-a11 .wl-hero-media{order:2}.wl-a11 .wl-section h2:not(:first-child){margin-top:42px;padding-top:32px}}\n<\/style><article class=\"wl-a11\"><div class=\"wl-wrap wl-section\"><h2 id=\"see-what-makes-the-profile-move-or-change\">See What Makes the\nProfile Move or Change<\/h2>\n<p>During a trial, change one useful production variable and keep the\nothers as steady as the job allows. Then measure the same width\npositions again.<\/p>\n<div class=\"wl-table\"><table>\n<thead>\n<tr class=\"header\">\n<th>What the profile follows<\/th>\n<th>Check next<\/th>\n<th>A stronger signal<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr class=\"odd\">\n<td>One print unit or color<\/td>\n<td>Ink condition, cylinder, doctoring, and unit contact<\/td>\n<td>Other colors remain relatively even on the same substrate<\/td>\n<\/tr>\n<tr class=\"even\">\n<td>One substrate roll or lot<\/td>\n<td>Thickness, coating, treatment, compressibility, and surface\nprofile<\/td>\n<td>Several colors develop a similar shape on the same material<\/td>\n<\/tr>\n<tr class=\"odd\">\n<td>Velocidad de l\u00ednea<\/td>\n<td>Ink transfer and drying first; dynamic contact if the position\nremains fixed<\/td>\n<td>The same profile returns at the same speed condition<\/td>\n<\/tr>\n<tr class=\"even\">\n<td>Impression setting<\/td>\n<td>Cross-web contact distribution<\/td>\n<td>The same width positions repeatedly become lighter or darker<\/td>\n<\/tr>\n<tr class=\"odd\">\n<td>Same machine-width position<\/td>\n<td>Roller geometry, local cover condition, loading, and support<\/td>\n<td>The position remains after substrate and cylinder changes<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>Changing pressure, ink viscosity, speed, and substrate during the\nsame trial often removes the evidence you need. A better print does not\ntell you much if four conditions changed at once.<\/p>\n<p>Impression pressure is particularly easy to misread. Increasing\npressure may improve a weak area, but watch the whole width. If the weak\nedge improves while the center becomes noticeably heavier, the response\nitself is useful evidence about cross-web contact distribution.<\/p>\n<p>If the print changes mainly with ESA operation, keep that on the\nelectrical transfer-assist path. It should not be used by itself to\njudge roller crown or mechanical loading.<\/p>\n\n<h2 id=\"when-the-impression-roll-is-worth-measuring-in-detail\">When the\nImpression Roll Is Worth Measuring in Detail<\/h2>\n<p>The impression roll becomes a strong lead when the density difference\nstays at the same machine-width position, sensible\nink\/cylinder\/substrate comparisons do not move it, and changing\nimpression load repeatedly changes the same part of the profile.<\/p>\n<p>For the general requirements of controlled nip contact, see <a\nhref=\"https:\/\/wolorin.com\/es\/function\/pressure-rollers\/\">Rodillos de presi\u00f3n<\/a>. On a wide gravure impression roll, the following\nmeasurements give a much clearer picture than one nominal diameter and\none hardness value.<\/p>\n<h3 id=\"compare-the-loaded-shape-with-the-printed-profile\">Compare the\nLoaded Shape with the Printed Profile<\/h3>\n<p>A long impression roll can be within its unloaded dimensional\nspecification and still produce a different contact shape under\npressure. Shaft stiffness, roll-body stiffness, working face length,\ncover compression, bearing support, and loading at the two ends all\naffect the loaded profile.<\/p>\n<p>Crown changes that profile as well. An existing crown may have worked\nwith a previous load or substrate and become less suitable after\noperating conditions change. Regrinding and wear can also alter the\noriginal profile.<\/p>\n<p>When an older impression roll ran the same job well, compare its\nknown profile and working condition with the current roll before\ndeciding on a new crown direction. For the wider design question, see <a\nhref=\"https:\/\/wolorin.com\/es\/blog\/crowned-rubber-rollers-when-crown-matters\/\">Crowned\nRubber Rollers: When Crown Matters<\/a>.<\/p>\n<h3 id=\"measure-diameter-at-the-positions-that-matter\">Measure Diameter\nat the Positions That Matter<\/h3>\n<p>Measure across the face rather than taking one reading at the center.\nLeft, center, and right give a basic profile. If the print has a fixed\nband, add measurements at that axial position and on both sides of\nit.<\/p>\n<p>For a band recorded 300 mm from the operator side, measure the roller\naround that same 300 mm position. This direct position-to-position\ncomparison is much more useful than collecting extra measurements at\nunrelated locations.<\/p>\n<p>Repeated grinding, local wear, contamination, or surface damage can\nleave a small axial diameter difference. On a wide and\npressure-sensitive nip, a difference that looks minor on the roller can\nstill show up clearly in the printed density profile.<\/p>\n<h3 id=\"compare-hardness-across-the-working-face\">Compare Hardness\nAcross the Working Face<\/h3>\n<p>If a density band keeps returning at one axial position, one nominal\nhardness value is not enough to describe the cover. Where the inspection\nmethod allows, compare hardness at several positions under similar\nroller and temperature conditions.<\/p>\n<p>A local hard or soft area changes compression at that point. Uneven\nageing, glazing, swelling, chemical exposure, local wear, or previous\nrepair can create this type of difference even when the roller still\nlooks acceptable from a distance.<\/p>\n<p>The useful comparison is cross-web consistency against the proven\nworking specification. A universal hardness number cannot replace that\ncomparison.<\/p>\n<h3 id=\"for-a-one-sided-problem-check-both-ends\">For a One-Sided\nProblem, Check Both Ends<\/h3>\n<p>When only one side of the print stays weak, check the impression roll\nas part of the complete supported assembly. Parallelism, bearings, shaft\nsupport, and loading at the operator and drive sides can all influence\nthe lateral contact profile.<\/p>\n<p>A new rubber cover cannot correct an angular nip or unequal loading\nat the two ends. If those conditions remain unchanged, replacing the\ncover alone may leave the same one-sided density problem in place.<\/p>\n<p>Where the press has an approved nip or contact-print check, compare\nthe left, center, and right under the same setup. The result becomes\nespecially useful when a low-contact area lines up with the weak\nposition already recorded in the density profile.<\/p>\n<\/div><\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d0f7df1 elementor-widget elementor-widget-html\" data-id=\"d0f7df1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\n.wl-a11{font-family:Inter,Arial,sans-serif;color:#2f3f50;font-size:16px;line-height:1.72;background:#fff}.wl-a11 *{box-sizing:border-box}.wl-a11 .wl-wrap{max-width:1180px;margin:0 auto;padding:58px 42px}.wl-a11 h1,.wl-a11 h2,.wl-a11 h3{color:#153a63;margin:0 0 20px;line-height:1.16}.wl-a11 h1{font-size:42px;font-weight:700}.wl-a11 h2{font-size:32px;font-weight:700;padding-top:8px}.wl-a11 h2+*{margin-top:0}.wl-a11 h3{font-size:22px;font-weight:700;margin-top:34px}.wl-a11 p{margin:0 0 18px}.wl-a11 ul,.wl-a11 ol{margin:0 0 22px;padding-left:24px}.wl-a11 li{margin:7px 0}.wl-a11 a{color:#1565c0;text-decoration:none}.wl-a11 a:hover{color:#f4b938}.wl-a11 strong{font-weight:700;color:#243c55}.wl-a11 .wl-table{overflow-x:auto;margin:26px 0 30px;border:1px solid #dde5ec;border-radius:10px}.wl-a11 table{width:100%;border-collapse:collapse;min-width:680px}.wl-a11 th{background:#153a63;color:#fff;font-weight:700;text-align:left}.wl-a11 th,.wl-a11 td{padding:13px 15px;border:1px solid #dde5ec;vertical-align:top}.wl-a11 tbody tr:nth-child(even){background:#f7f9fb}.wl-a11 blockquote{margin:24px 0;padding:18px 22px;border-left:4px solid #f4b938;background:#f6f8fa}.wl-a11 pre{white-space:pre-wrap;background:#153a63;color:#fff;padding:22px;border-radius:10px;overflow:auto}.wl-a11 code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.wl-a11 .wl-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:42px;align-items:center;background:#f5f7f9}.wl-a11 .wl-hero-media{background:#fff;border:1px solid #dde5ec;border-radius:12px;padding:14px}.wl-a11 .wl-hero img{width:100%;aspect-ratio:4\/3;object-fit:cover;border-radius:8px;display:block}.wl-a11 .wl-section{border-top:1px solid #edf1f4}.wl-a11 .wl-section h2:not(:first-child){margin-top:58px;padding-top:42px;border-top:1px solid #edf1f4}.wl-a11 .wl-cta{background:#f4f6f8}.wl-a11 .wl-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}.wl-a11 .wl-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 22px;border-radius:6px;background:#f4b938;color:#153a63!important;font-weight:700}.wl-a11 .wl-btn:nth-child(even){background:#fff;border:1px solid #cfd9e3}.wl-a11 .wl-btn:hover{background:#153a63;color:#fff!important}\n@media(max-width:767px){.wl-a11 .wl-wrap{padding:38px 22px}.wl-a11 .wl-hero{grid-template-columns:1fr}.wl-a11 h1{font-size:33px}.wl-a11 h2{font-size:27px}.wl-a11 h3{font-size:21px}.wl-a11 .wl-hero-media{order:2}.wl-a11 .wl-section h2:not(:first-child){margin-top:42px;padding-top:32px}}\n<\/style><article class=\"wl-a11\"><div class=\"wl-wrap wl-section\"><h2 id=\"keep-these-details-with-the-impression-roll\">Keep These Details\nwith the Impression Roll<\/h2>\n<p>If the investigation reaches the impression roll, keep the\ninformation that describes the roller itself and the conditions around\nits contact: drawing if available, face length, shaft and core\ndimensions, outside-diameter readings across the face, existing crown\ninformation, available hardness readings, and clear photos of the old\ncover.<\/p>\n<p>Add the exact roller position, substrate thickness, line speed,\nimpression condition, and the media that regularly reach the cover\nduring production or cleaning. Keep the cross-web density profile with\nthe roller records, including the position of any fixed band.<\/p>\n<p>If the previous impression roll ran the same job well, its\ndimensions, hardness, surface condition, crown, and service history\nprovide a useful manufacturing reference. A straightforward replacement\nwith a proven drawing and working specification can usually move forward\nwithout turning the project into a lengthy troubleshooting exercise.<\/p>\n<p>When the same cross-web density problem has returned after\nreplacement or regrinding, keep the old failure pattern with the new\nproject. Copying the nominal diameter and hardness alone can reproduce a\ncontact profile that was already causing trouble.<\/p>\n\n<h2 id=\"more-on-gravure-impression-rollers-and-materials\">More on\nGravure Impression Rollers and Materials<\/h2>\n<p><a\nhref=\"https:\/\/wolorin.com\/es\/applications\/printing-industry-rollers\/\"><strong>Rodillos para la industria de la impresi\u00f3n<\/strong><\/a><\/p>\n<p>Roller positions and working conditions around printing, impression\ncontact, and web handling.<\/p>\n<p><a\nhref=\"https:\/\/wolorin.com\/es\/function\/pressure-rollers\/\"><strong>Rodillos de presi\u00f3n<\/strong><\/a><\/p>\n<p>Roller design considerations for nip contact, pressure distribution,\ngeometry, and full-width contact stability.<\/p>\n<p><a\nhref=\"https:\/\/wolorin.com\/es\/material\/nbr-rubber-rollers\/\"><strong>Rodillos de caucho NBR\/nitrilo<\/strong><\/a><\/p>\n<p>A material direction for selected printing positions involving\ncompatible ink, oil, cleaning media, or other industrial liquid\ncontact.<\/p>\n<p><a\nhref=\"https:\/\/wolorin.com\/es\/material\/polyurethane-rubber-rollers\/\"><strong>Rodillos de caucho de poliuretano<\/strong><\/a><\/p>\n<p>A material direction for roller positions where wear resistance, load\nsupport, and repeated mechanical contact are stronger requirements.<\/p><\/div><\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7df42a9 elementor-widget elementor-widget-html\" data-id=\"7df42a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\n.wl-a11{font-family:Inter,Arial,sans-serif;color:#2f3f50;font-size:16px;line-height:1.72;background:#fff}.wl-a11 *{box-sizing:border-box}.wl-a11 .wl-wrap{max-width:1180px;margin:0 auto;padding:58px 42px}.wl-a11 h1,.wl-a11 h2,.wl-a11 h3{color:#153a63;margin:0 0 20px;line-height:1.16}.wl-a11 h1{font-size:42px;font-weight:700}.wl-a11 h2{font-size:32px;font-weight:700;padding-top:8px}.wl-a11 h2+*{margin-top:0}.wl-a11 h3{font-size:22px;font-weight:700;margin-top:34px}.wl-a11 p{margin:0 0 18px}.wl-a11 ul,.wl-a11 ol{margin:0 0 22px;padding-left:24px}.wl-a11 li{margin:7px 0}.wl-a11 a{color:#1565c0;text-decoration:none}.wl-a11 a:hover{color:#f4b938}.wl-a11 strong{font-weight:700;color:#243c55}.wl-a11 .wl-table{overflow-x:auto;margin:26px 0 30px;border:1px solid #dde5ec;border-radius:10px}.wl-a11 table{width:100%;border-collapse:collapse;min-width:680px}.wl-a11 th{background:#153a63;color:#fff;font-weight:700;text-align:left}.wl-a11 th,.wl-a11 td{padding:13px 15px;border:1px solid #dde5ec;vertical-align:top}.wl-a11 tbody tr:nth-child(even){background:#f7f9fb}.wl-a11 blockquote{margin:24px 0;padding:18px 22px;border-left:4px solid #f4b938;background:#f6f8fa}.wl-a11 pre{white-space:pre-wrap;background:#153a63;color:#fff;padding:22px;border-radius:10px;overflow:auto}.wl-a11 code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.wl-a11 .wl-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:42px;align-items:center;background:#f5f7f9}.wl-a11 .wl-hero-media{background:#fff;border:1px solid #dde5ec;border-radius:12px;padding:14px}.wl-a11 .wl-hero img{width:100%;aspect-ratio:4\/3;object-fit:cover;border-radius:8px;display:block}.wl-a11 .wl-section{border-top:1px solid #edf1f4}.wl-a11 .wl-section h2:not(:first-child){margin-top:58px;padding-top:42px;border-top:1px solid #edf1f4}.wl-a11 .wl-cta{background:#f4f6f8}.wl-a11 .wl-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}.wl-a11 .wl-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 22px;border-radius:6px;background:#f4b938;color:#153a63!important;font-weight:700}.wl-a11 .wl-btn:nth-child(even){background:#fff;border:1px solid #cfd9e3}.wl-a11 .wl-btn:hover{background:#153a63;color:#fff!important}\n@media(max-width:767px){.wl-a11 .wl-wrap{padding:38px 22px}.wl-a11 .wl-hero{grid-template-columns:1fr}.wl-a11 h1{font-size:33px}.wl-a11 h2{font-size:27px}.wl-a11 h3{font-size:21px}.wl-a11 .wl-hero-media{order:2}.wl-a11 .wl-section h2:not(:first-child){margin-top:42px;padding-top:32px}}\n<\/style><article class=\"wl-a11\"><div class=\"wl-wrap wl-cta\"><p>If you already have drawings, dimensions, samples, or a clear\nimpression-roll specification, send them to Wolorin for custom\nmanufacturing, quotation, or production confirmation.<\/p>\n<p>If details are incomplete, start with old roller photos, basic\ndimensions, roller position, contact medium, and the current\nroller-related density problem.<\/p><div class=\"wl-actions\"><a class=\"wl-btn\" href=\"https:\/\/wolorin.com\/es\/contact-us\/\">Contacto<\/a><a class=\"wl-btn\" href=\"https:\/\/wolorin.com\/es\/send-drawings\/\">Enviar planos o datos del rodillo<\/a><\/div><\/div><\/article>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Gravure Cross-Web Density Variation When one gravure color prints lighter at both edges, darker through the center, weak on one side, or shows a fixed band across the web, the first useful clue is where that density difference sits across the width. Measure the same image area at fixed positions from left to right and [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-5417","post","type-post","status-publish","format-standard","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/posts\/5417","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/comments?post=5417"}],"version-history":[{"count":13,"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/posts\/5417\/revisions"}],"predecessor-version":[{"id":5565,"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/posts\/5417\/revisions\/5565"}],"wp:attachment":[{"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/media?parent=5417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/categories?post=5417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wolorin.com\/es\/wp-json\/wp\/v2\/tags?post=5417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}