{"id":10003,"date":"2026-06-09T16:04:18","date_gmt":"2026-06-09T16:04:18","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10003"},"modified":"2026-06-09T16:04:18","modified_gmt":"2026-06-09T16:04:18","slug":"uv-screen-ink-photoinitiator","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/de\/uv-screen-ink-photoinitiator\/","title":{"rendered":"Lichtinitiator f\u00fcr UV-Siebdruckfarbe: Auswahl nach Pigmentbeladung, Schichtdicke und LED-Abstimmung"},"content":{"rendered":"<p><strong>Schnelle Antwort:<\/strong> In UV screen ink, the best photoinitiator is the one that matches the real ink film and pigment challenge, not the one with the broadest generic ink description. <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-tpo-cas-75980-60-8\/\">Fotoinitiator TPO<\/a> deserves early attention when the formulation needs <strong>deeper cure, lower yellowing, and stronger relevance to white or high-pigment systems<\/strong>. <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-369-cas-119313-12-1\/\">Photoinitiator 369<\/a> is a strong first review point when the real job is <strong>dark-color, opaque, or more difficult screen-ink curing<\/strong>. <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-detx-cas-82799-44-8\/\">Fotoinitiator DETX<\/a> moves up when the buyer wants a <strong>long-wave route with visible-light or LED relevance<\/strong> and is willing to build the package correctly with a co-initiator.<\/p>\n<p>That is the useful commercial split. UV screen ink selection becomes much cleaner when buyers compare <strong>pigment load, film build, cure-through pressure, and lamp fit<\/strong> first instead of treating all photoinitiators as interchangeable names.<\/p>\n<h2>Why UV screen ink needs a tighter shortlist<\/h2>\n<p>Screen-printing jobs often punish weak photoinitiator selection faster than a generic UV-ink article suggests. The deposit is frequently heavier, the color can be darker or more opaque, and the buyer usually cares about several things at once:<\/p>\n<ul>\n<li><strong>Film build and cure-through:<\/strong> the surface can look acceptable while deeper cure still lags.<\/li>\n<li><strong>Pigment burden:<\/strong> white, black, and high-opacity colors change how much light reaches the lower part of the film.<\/li>\n<li><strong>Lamp fit:<\/strong> conventional UV and LED-centered setups do not always reward the same shortlist.<\/li>\n<li><strong>Appearance pressure:<\/strong> yellowing control still matters, especially in white or light-colored work.<\/li>\n<li><strong>Formulation design:<\/strong> some routes need a simple Type I starting point, while others need a Type II package with a co-initiator.<\/li>\n<\/ul>\n<p>That is why a short disciplined first sample round is usually more useful than a long generic list.<\/p>\n<p>If you need the broader family view first, start with Longchang&#8217;s <a href=\"https:\/\/longchangchemical.com\/de\/photoinitiator-selection-guide\/\">photoinitiator selection guide<\/a>.<\/p>\n<h2>Quick shortlist: TPO vs 369 vs DETX for UV screen ink<\/h2>\n<table>\n<thead>\n<tr>\n<th>Produkt<\/th>\n<th>Best first fit<\/th>\n<th>Why buyers shortlist it<\/th>\n<th>When it is not the first option<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-tpo-cas-75980-60-8\/\">TPO<\/a><\/td>\n<td>White, high-pigment, or deeper-curing screen inks where low yellowing also matters<\/td>\n<td>Longchang explicitly lists screen-printing inks, colored systems, deep curing, low yellowing, and preference for white or high-pigment systems on the current TPO page<\/td>\n<td>When the job is mainly a dark-color screen-ink route or when the buyer specifically wants a long-wave Type II package around an amine co-initiator<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-369-cas-119313-12-1\/\">369<\/a><\/td>\n<td>Dark-color, opaque, or more difficult screen inks that need stronger long-wave help<\/td>\n<td>Longchang explicitly positions 369 for screen-printing inks, dark-color systems, and deeper or pigmented cure, with a recommended screen-ink route of 2 to 4% 369 plus 1 to 3% 184<\/td>\n<td>When the buyer&#8217;s first concern is white-system yellowing control or a LED-leaning Type II route<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-detx-cas-82799-44-8\/\">DETX<\/a><\/td>\n<td>Long-wave, visible-light, or LED-oriented screen-ink packages that can use a co-initiator<\/td>\n<td>Longchang positions DETX for screen-printing inks, long-wave absorption near 385 nm, response to 405 nm and 420 nm LEDs, and good performance in colored systems and thicker films<\/td>\n<td>When the team wants the simplest single-product starting point instead of a Type II route that must be built with tertiary amines or another co-initiator package<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>When TPO is the better fit<\/h2>\n<p>TPO deserves early review when the buyer is trying to protect cure-through and appearance at the same time.<\/p>\n<ul>\n<li><strong>Screen-ink relevance is explicit:<\/strong> Longchang directly lists screen printing inks on the TPO page.<\/li>\n<li><strong>High-pigment and white-system logic is direct:<\/strong> the same page supports colored systems, deep curing, and preference for white or high-pigment systems.<\/li>\n<li><strong>Yellowing control matters:<\/strong> Longchang also supports low yellowing and low odor positioning for TPO in these UV-curing applications.<\/li>\n<li><strong>Thicker-film logic is already part of the product story:<\/strong> the page repeatedly frames TPO around thick films and deeper cure.<\/li>\n<\/ul>\n<p>If the screen ink is white, highly pigmented, or being evaluated partly on appearance stability, TPO usually deserves one of the earliest sample positions.<\/p>\n<h2>When 369 is the better fit<\/h2>\n<p>369 moves ahead when the job stops behaving like an easy clear or lightly pigmented screen ink.<\/p>\n<ul>\n<li><strong>Screen-printing support is direct:<\/strong> Longchang explicitly lists screen printing inks on the 369 page.<\/li>\n<li><strong>Dark-color fit is stronger:<\/strong> the same page says 369 is particularly suitable for dark color systems such as blue and black.<\/li>\n<li><strong>Opaque and deeper-cure logic is already established:<\/strong> Longchang positions 369 for deeper or pigmented curing and long-wave UV capture around 350 to 380 nm.<\/li>\n<li><strong>There is even a packaged screen-ink starting point:<\/strong> the current page recommends <strong>2 to 4% 369 plus 1 to 3% 184<\/strong> for screen inks.<\/li>\n<\/ul>\n<p>That makes 369 especially useful when the buyer is not just screening a routine ink, but trying to solve a darker or optically harder screen-print route. If you need the companion benchmark product in that package, see <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-184-cas-947-19-3\/\">Photoinitiator 184<\/a>.<\/p>\n<h2>When DETX is the better fit<\/h2>\n<p>DETX should move up when the buyer wants a more deliberate long-wave route instead of a simple one-product benchmark.<\/p>\n<ul>\n<li><strong>Screen-printing relevance is explicit:<\/strong> Longchang directly lists screen printing inks on the DETX page.<\/li>\n<li><strong>LED and visible-light relevance are stronger:<\/strong> the page supports peak absorption around <strong>385 nm<\/strong> and response to <strong>405 nm and 420 nm LEDs<\/strong>.<\/li>\n<li><strong>Thicker-film and colored-system value are already part of the positioning:<\/strong> Longchang supports DETX for colored systems, white coatings, and thicker films.<\/li>\n<li><strong>Package design matters:<\/strong> Longchang also makes clear that DETX is a <strong>Type II<\/strong> route that needs a co-initiator such as a tertiary amine to generate radicals efficiently.<\/li>\n<\/ul>\n<p>If the buyer is building an LED-oriented screen-ink package or wants a longer-wave support route for a harder film, DETX can be a very practical shortlist item. It is simply better treated as a <strong>package design decision<\/strong>, not as a drop-in replacement for every Type I benchmark.<\/p>\n<h2>How buyers should choose before requesting samples<\/h2>\n<h3>1. Start with the real color and opacity problem<\/h3>\n<p>White, light, dark, and highly opaque screen inks should not all use the same first shortlist.<\/p>\n<h3>2. Keep film build visible<\/h3>\n<p>A heavier screen-ink deposit changes the cure-through problem. Do not judge the package only by surface feel.<\/p>\n<h3>3. Separate Type I and Type II logic<\/h3>\n<p>TPO and 369 can be reviewed as direct radical routes. DETX needs to be evaluated as a Type II package with the right co-initiator support.<\/p>\n<h3>4. Match the lamp first<\/h3>\n<p>If the line is leaning toward 405 nm style LED selection, the shortlist should show that from the first sample round.<\/p>\n<h3>5. Keep the first trial round tight<\/h3>\n<p>A better commercial answer usually comes from comparing two or three well-matched routes rather than screening a long speculative list.<\/p>\n<p>If the printing project is closer to narrow-web packaging work, continue with <a href=\"https:\/\/longchangchemical.com\/de\/uv-flexo-ink-photoinitiator\/\">Photoinitiator for UV Flexo Ink<\/a>. If the line is moving toward broader LED selection logic, see <a href=\"https:\/\/longchangchemical.com\/de\/photoinitiator-uv-led-curing\/\">Photoinitiator for UV LED Curing<\/a>.<\/p>\n<h2>Recommended Longchang product and article paths<\/h2>\n<ul>\n<li><strong>White or high-pigment deep-cure route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-tpo-cas-75980-60-8\/\">Fotoinitiator TPO<\/a><\/li>\n<li><strong>Dark-color and opaque screen-ink route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-369-cas-119313-12-1\/\">Photoinitiator 369<\/a><\/li>\n<li><strong>Long-wave LED-oriented route:<\/strong> <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-detx-cas-82799-44-8\/\">Fotoinitiator DETX<\/a><\/li>\n<li><strong>Companion benchmark in screen-ink blends:<\/strong> <a href=\"https:\/\/longchangchemical.com\/de\/product\/photoinitiator-184-cas-947-19-3\/\">Photoinitiator 184<\/a><\/li>\n<li><strong>Related packaging-printing article:<\/strong> <a href=\"https:\/\/longchangchemical.com\/de\/uv-flexo-ink-photoinitiator\/\">Photoinitiator for UV Flexo Ink<\/a><\/li>\n<li><strong>Broader family guide:<\/strong> <a href=\"https:\/\/longchangchemical.com\/de\/photoinitiator-selection-guide\/\">How to Choose a Photoinitiator for UV Curing<\/a><\/li>\n<\/ul>\n<h2>FAQ<\/h2>\n<h3>Which photoinitiator is best for UV screen ink?<\/h3>\n<p>There is no single best answer. TPO usually deserves early attention for white or high-pigment deep-cure work, 369 is a stronger route for darker or opaque screen inks, and DETX becomes more relevant when the buyer wants a long-wave LED-oriented package with a co-initiator.<\/p>\n<h3>Why is UV screen ink selection different from a generic UV ink article?<\/h3>\n<p>Because screen-printing jobs often carry a heavier film build and a tougher cure-through problem, especially in opaque, white, or dark-colored systems.<\/p>\n<h3>When should I choose 369 instead of TPO?<\/h3>\n<p>Choose 369 earlier when the real issue is dark-color or more opaque screen-ink curing and you want a route Longchang already positions for those systems.<\/p>\n<h3>When should DETX move up the list?<\/h3>\n<p>Move DETX up when the line is more LED-oriented, longer-wave response matters, and the team is willing to build a proper Type II package with a co-initiator.<\/p>\n<h2>Need a tighter shortlist for UV screen ink?<\/h2>\n<p>If your project is being limited by pigment burden, film build, cure-through, or LED fit, define the real bottleneck first and then compare only the most relevant Longchang routes. That usually gives a cleaner sampling decision than comparing photoinitiator names without an application frame.<\/p>","protected":false},"excerpt":{"rendered":"<p>A practical B2B guide to choosing a photoinitiator for UV screen ink by comparing pigment load, film build, dark-color cure, white-ink cure-through, and LED fit.<\/p>","protected":false},"author":6,"featured_media":10004,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-10003","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-catalysts-chemical-auxiliary-agents"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Photoinitiator for UV Screen Ink: How to Choose for Pigment Load, Film Build, and LED Fit - Longchang Chemical<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/longchangchemical.com\/de\/uv-screen-ink-photoinitiator\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Photoinitiator for UV Screen Ink: How to Choose for Pigment Load, Film Build, and LED Fit - 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