{"id":7874,"date":"2025-01-29T13:33:33","date_gmt":"2025-01-29T13:33:33","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=7874"},"modified":"2026-04-28T10:42:49","modified_gmt":"2026-04-28T10:42:49","slug":"uv-letterpress-ink-photoinitiator","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/uv-letterpress-ink-photoinitiator\/","title":{"rendered":"Tinta UV para impress\u00e3o tipogr\u00e1fica - Fotoiniciador"},"content":{"rendered":"<p>Tinta UV para impress\u00e3o tipogr\u00e1fica - Fotoiniciador<\/p>\n<p>A impress\u00e3o tipogr\u00e1fica \u00e9 um dos m\u00e9todos de impress\u00e3o mais antigos utilizados no setor de impress\u00e3o, com a inven\u00e7\u00e3o da impress\u00e3o por col\u00f3dio por Bi Sheng na dinastia Song, a impress\u00e3o em xilogravura por Wang Zhen na dinastia Yuan e a impress\u00e3o em chumbo por Gutenberg no s\u00e9culo XV, todas elas tipografias. Na impress\u00e3o tipogr\u00e1fica, a parte gr\u00e1fica \u00e9 elevada na superf\u00edcie da chapa de impress\u00e3o, e a tinta \u00e9 aplicada somente \u00e0 parte gr\u00e1fica e depois transmitida diretamente ao substrato. H\u00e1 dois tipos de tipografia: a do tipo plataforma e a do tipo rotativo. O tipo plataforma tem a chapa de impress\u00e3o como uma superf\u00edcie plana e o rolo de impress\u00e3o como um cilindro, enquanto o tipo rotativo tem a chapa de impress\u00e3o e o rolo de impress\u00e3o como uma estrutura cil\u00edndrica.<\/p>\n<p>3.6.1 Confec\u00e7\u00e3o de chapas para impress\u00e3o tipogr\u00e1fica<br \/>\nAs chapas usadas para impress\u00e3o tipogr\u00e1fica agora s\u00e3o chapas de impress\u00e3o tipogr\u00e1fica de resina fotopolimerizada feitas de resina fotopolimerizada por meio de exposi\u00e7\u00e3o e revela\u00e7\u00e3o UV. As placas de impress\u00e3o tipogr\u00e1fica de resina fotopolimerizada s\u00e3o divididas em dois tipos: placas de impress\u00e3o tipogr\u00e1fica de resina fotopolimerizada l\u00edquida e placas de impress\u00e3o tipogr\u00e1fica de resina fotopolimerizada s\u00f3lida.<\/p>\n<p>(1) Confec\u00e7\u00e3o de chapas de revestimento de resina fotopolimerizada s\u00f3lida<br \/>\nA chapa de impress\u00e3o tipogr\u00e1fica de fotopol\u00edmero s\u00f3lido adota material de pol\u00edmero s\u00f3lido para pr\u00e9-produzir a chapa de fotopol\u00edmero, cuja estrutura \u00e9 mostrada na Figura 3-18.<\/p>\n<p>Figura 3-18 Estrutura das placas de toppan de fotopol\u00edmero s\u00f3lido<\/p>\n<p>A placa de resina s\u00f3lida consiste em um pol\u00edmero saturado, um agente de liga\u00e7\u00e3o cruzada e um fotoiniciador. Os pol\u00edmeros saturados s\u00e3o derivados de \u00e1lcool polivin\u00edlico, derivados de celulose e poliamidas; o agente de reticula\u00e7\u00e3o s\u00e3o compostos divin\u00edlicos; os fotoiniciadores s\u00e3o principalmente \u00e9teres de benjoim ou antraquinonas. Depois que os componentes acima s\u00e3o misturados uniformemente, eles s\u00e3o revestidos em uma base de folha de poli\u00e9ster ou base de alum\u00ednio com uma camada anti-hala\u00e7\u00e3o e, ap\u00f3s a secagem, s\u00e3o transformados em uma chapa de impress\u00e3o tipogr\u00e1fica de resina fotossens\u00edvel s\u00f3lida. H\u00e1 tamb\u00e9m um componente de placa de resina s\u00f3lida que \u00e9 misturado e produzido por moldagem por extrus\u00e3o.<\/p>\n<p>Processo de fabrica\u00e7\u00e3o de chapas de impress\u00e3o tipogr\u00e1fica de resina fotopolim\u00e9rica s\u00f3lida:<\/p>\n<p>Cobrir o negativo \u2192 exposi\u00e7\u00e3o UV \u2192 revela\u00e7\u00e3o \u2192 secagem \u2192 p\u00f3s-exposi\u00e7\u00e3o \u2192 chapa de impress\u00e3o.<\/p>\n<p>Depois que a pel\u00edcula protetora de polietileno \u00e9 removida da chapa de resina s\u00f3lida, o negativo e a camada de resina fotopolimerizada s\u00e3o laminados a v\u00e1cuo, expostos aos raios UV, a parte vis\u00edvel \u00e0 luz \u00e9 reticulada e curada para formar a parte gr\u00e1fica, e a parte vis\u00edvel \u00e0 luz \u00e9 removida no processo de revela\u00e7\u00e3o. Ap\u00f3s a secagem, a segunda exposi\u00e7\u00e3o UV \u00e9 aplicada o suficiente para solidificar completamente a chapa para melhorar a dureza da chapa e transform\u00e1-la em uma chapa de impress\u00e3o.<\/p>\n<p>(2) Grava\u00e7\u00e3o de chapas de impress\u00e3o tipogr\u00e1fica com resina fotopolimerizada l\u00edquida<br \/>\nA impress\u00e3o tipogr\u00e1fica de resina fotopolimerizada l\u00edquida refere-se ao estado l\u00edquido da resina antes da sensibiliza\u00e7\u00e3o, e a impress\u00e3o tipogr\u00e1fica de resina torna-se s\u00f3lida ap\u00f3s a sensibiliza\u00e7\u00e3o. A vers\u00e3o de resina l\u00edquida da resina de fotopolimeriza\u00e7\u00e3o \u00e9 composta principalmente de poli\u00e9ster insaturado e acrilato de poliuretano, agente de reticula\u00e7\u00e3o para bis-alcenos ou alcenos insaturados, e os fotoiniciadores s\u00e3o principalmente da classe do \u00e9ter de benjoim. O processo de fabrica\u00e7\u00e3o de chapas para chapas de impress\u00e3o tipogr\u00e1fica de resina fotopolimerizada l\u00edquida \u00e9 (consulte a Figura 3-19):<\/p>\n<p>Revestimento com resina de fotopolimeriza\u00e7\u00e3o \u2192 exposi\u00e7\u00e3o UV da frente e do verso \u2192 revela\u00e7\u00e3o \u2192 secagem \u2192 p\u00f3s-exposi\u00e7\u00e3o \u2192 chapa de impress\u00e3o<\/p>\n<p>Figura 3-19 Processo de confec\u00e7\u00e3o de chapas para chapas de impress\u00e3o tipogr\u00e1fica de fotopol\u00edmero l\u00edquido<\/p>\n<p>As chapas de impress\u00e3o tipogr\u00e1fica de resina fotopolim\u00e9rica s\u00f3lida e as chapas de impress\u00e3o tipogr\u00e1fica de resina fotopolim\u00e9rica l\u00edquida foram amplamente utilizadas nas d\u00e9cadas de 1970 e 1990 na impress\u00e3o de jornais e revistas, etiquetas, papel de embrulho e pap\u00e9is timbrados. No entanto, devido \u00e0 baixa resolu\u00e7\u00e3o das chapas de impress\u00e3o, \u00e0 baixa resist\u00eancia de impress\u00e3o e \u00e0 baixa qualidade de impress\u00e3o, elas foram gradualmente substitu\u00eddas pela impress\u00e3o offset e pela impress\u00e3o flexogr\u00e1fica e sa\u00edram do est\u00e1gio da hist\u00f3ria da impress\u00e3o.<\/p>\n<p><!-- lc-commercial-start --><\/p>\n<h2>A practical selection route for photoinitiator-related projects<\/h2>\n<p>When technical buyers or formulators screen photoinitiators, the most useful decision frame is usually cure quality plus application fit: which package cures reliably, keeps appearance acceptable, and still works under the lamp, film thickness, and substrate conditions of the actual process.<\/p>\n<ul>\n<li><strong>Match the package to the lamp first:<\/strong> mercury lamps, UV LEDs, and visible-light systems can rank the same photoinitiators very differently.<\/li>\n<li><strong>Check depth cure and surface cure separately:<\/strong> a film that feels dry on top can still be weak underneath.<\/li>\n<li><strong>Balance yellowing with reactivity:<\/strong> the strongest deep-cure route is not always the best commercial choice if color or migration risk becomes unacceptable.<\/li>\n<li><strong>Use the final formula as the benchmark:<\/strong> pigment load, monomer package, and film thickness can all change the apparent ranking of the same initiator.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-tpo-l-cas-84434-11-7\/\">CHLUMINIT TPO-L<\/a>:<\/strong> A strong low-yellowing reference for LED-oriented UV systems.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\">CHLUMINIT 819<\/a>:<\/strong> Useful when a formulation needs stronger absorption and deeper cure support.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/irgacure-1173-cas-7473-98-5\/\">CHLUMINIT 1173<\/a>:<\/strong> A practical comparison point for classic short-wave UV initiation.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-itx-cas-5495-84-1\/\">CHLUMINIT ITX<\/a>:<\/strong> A useful long-wave support route in many printing-ink packages.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why are blended photoinitiator packages so common?<\/strong><br \/>Because one product may control yellowing or lamp fit well while another improves cure depth or line-speed performance, so the full package is often stronger than any single grade.<\/p>\n<p><strong>Should incomplete cure always be solved by adding more initiator?<\/strong><br \/>Not automatically. The real limitation may be the lamp, film thickness, pigment shading, or the rest of the reactive system rather than simple under-dosage.<\/p>\n<p><!-- lc-commercial-end --><\/p>\n<h2><strong><b>Entre em contato conosco agora!<\/b><\/strong><\/h2>\n<p><!-- lc-qa-start --><\/p>\n<p><strong>Quick answer:<\/strong> For practical formulation work, photoinitiator screening starts with the light source and film build, then checks yellowing, adhesion, and cure completeness under real production conditions.<\/p>\n<p><!-- lc-qa-end --><\/p>\n<h4><strong><b>Se precisar do Price, preencha suas informa\u00e7\u00f5es de contato no formul\u00e1rio abaixo. Normalmente, entraremos em contato dentro de 24 horas. Voc\u00ea tamb\u00e9m pode me enviar um e-mail <a href=\"mailto:info@longchangchemical.com\"><span style=\"color: #00ccff;\">info@longchangchemical.com<\/span><\/a>\u00a0durante o hor\u00e1rio comercial (das 8h30 \u00e0s 18h UTC+8 de segunda a s\u00e1bado) ou use o bate-papo ao vivo do site para obter uma resposta imediata.<\/b><\/strong><\/h4>\n<p>&nbsp;<\/p>\n<table style=\"border-collapse: collapse; width: 435.77pt;\" border=\"0\" width=\"581\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt; width: 215.25pt;\" width=\"287\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-tpo-cas-75980-60-8\/\"><span style=\"color: #00ccff;\">Fotoiniciador TPO<\/span><\/a><\/td>\n<td style=\"width: 220.50pt;\" width=\"294\">CAS 75980-60-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/cas-270586-78-2\/\"><span style=\"color: #00ccff;\">Fotoiniciador TMO<\/span><\/a><\/td>\n<td>CAS 270586-78-2<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-pd-01-cas-579-07-7\/\"><span style=\"color: #00ccff;\">Fotoiniciador PD-01<\/span><\/a><\/td>\n<td>CAS 579-07-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-pbz-cas-2128-93-0\/\"><span style=\"color: #00ccff;\">Fotoiniciador PBZ<\/span><\/a><\/td>\n<td>CAS 2128-93-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-oxe-02-cas-478556-66-0\/\"><span style=\"color: #00ccff;\">Fotoiniciador OXE-02<\/span><\/a><\/td>\n<td>CAS 478556-66-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-ombb\/\"><span style=\"color: #00ccff;\">Fotoiniciador OMBB<\/span><\/a><\/td>\n<td>CAS 606-28-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-mpbz-6012\/\"><span style=\"color: #00ccff;\">Fotoiniciador MPBZ (6012)<\/span><\/a><\/td>\n<td>CAS 86428-83-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-mbp-cas-134-84-9\/\"><span style=\"color: #00ccff;\">Fotoiniciador MBP<\/span><\/a><\/td>\n<td>CAS 134-84-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-mbf-cas-15206-55-0\/\"><span style=\"color: #00ccff;\">Fotoiniciador MBF<\/span><\/a><\/td>\n<td>CAS 15206-55-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-lap-cas-85073-19-4\/\"><span style=\"color: #00ccff;\">Fotoiniciador LAP<\/span><\/a><\/td>\n<td>CAS 85073-19-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-itx-cas-5495-84-1\/\"><span style=\"color: #00ccff;\">Fotoiniciador ITX<\/span><\/a><\/td>\n<td>CAS 5495-84-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-emk\/\"><span style=\"color: #00ccff;\">Fotoiniciador EMK<\/span><\/a><\/td>\n<td>CAS 90-93-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-eha-cas-21245-02-3\/\"><span style=\"color: #00ccff;\">Fotoiniciador EHA<\/span><\/a><\/td>\n<td>CAS 21245-02-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-edb-cas-10287-53-3\/\"><span style=\"color: #00ccff;\">Fotoiniciador EDB<\/span><\/a><\/td>\n<td>CAS 10287-53-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-detx-cas-82799-44-8\/\"><span style=\"color: #00ccff;\">Fotoiniciador DETX<\/span><\/a><\/td>\n<td>CAS 82799-44-8<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-cq\/\"><span style=\"color: #00ccff;\">Fotoiniciador CQ \/ canforoquinona<\/span><\/a><\/td>\n<td>CAS 10373-78-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-cbp-cas-134-85-0\/\"><span style=\"color: #00ccff;\">Fotoiniciador CBP<\/span><\/a><\/td>\n<td>CAS 134-85-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-bp-cas-119-61-9\/\"><span style=\"color: #00ccff;\">Fotoiniciador BP \/ Benzofenona<\/span><\/a><\/td>\n<td>CAS 119-61-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-bms\/\"><span style=\"color: #00ccff;\">Fotoiniciador BMS<\/span><\/a><\/td>\n<td>CAS 83846-85-9<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-938\/\"><span style=\"color: #00ccff;\">Fotoiniciador 938<\/span><\/a><\/td>\n<td>CAS 61358-25-6<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-937-cas-71786-70-4\/\"><span style=\"color: #00ccff;\">Fotoiniciador 937<\/span><\/a><\/td>\n<td>CAS 71786-70-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-dw\/\"><span style=\"color: #00ccff;\">Fotoiniciador 819 DW<\/span><\/a><\/td>\n<td>CAS 162881-26-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-819-irgacure-819-cas-162881-26-7\/\"><span style=\"color: #00ccff;\">Fotoiniciador 819<\/span><\/a><\/td>\n<td>CAS 162881-26-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-784-cas-125051-32-3\/\"><span style=\"color: #00ccff;\">Fotoiniciador 784<\/span><\/a><\/td>\n<td>CAS 125051-32-3<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-754-cas-211510-16-6-442536-99-4\/\"><span style=\"color: #00ccff;\">Fotoiniciador 754<\/span><\/a><\/td>\n<td>CAS 211510-16-6 442536-99-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-6993-cas-71449-78-0\/\"><span style=\"color: #00ccff;\">Fotoiniciador 6993<\/span><\/a><\/td>\n<td>CAS 71449-78-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-6976\/\"><span style=\"color: #00ccff;\">Fotoiniciador 6976<\/span><\/a><\/td>\n<td>CAS 71449-78-0 89452-37-9 108-32-7<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-379-cas-119344-86-4\/\"><span style=\"color: #00ccff;\">Fotoiniciador 379<\/span><\/a><\/td>\n<td>CAS 119344-86-4<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-369-cas-119313-12-1\/\"><span style=\"color: #00ccff;\">Fotoiniciador 369<\/span><\/a><\/td>\n<td>CAS 119313-12-1<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><span style=\"color: #00ccff;\"><a style=\"color: #00ccff;\" href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-160\/\">Fotoiniciador 160<\/a><\/span><\/td>\n<td>CAS 71868-15-0<\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-1206\/\"><span style=\"color: #00ccff;\">Fotoiniciador 1206<\/span><\/a><\/td>\n<td><\/td>\n<\/tr>\n<tr style=\"height: 13.50pt;\">\n<td style=\"height: 13.50pt;\" height=\"18\"><a href=\"https:\/\/longchangchemical.com\/pt\/product\/irgacure-1173-cas-7473-98-5\/\"><span style=\"color: #00ccff;\">Fotoiniciador 1173<\/span><\/a><\/td>\n<td>CAS 7473-98-5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Letterpress is one of the earliest printing methods utilized in the printing industry, with the invention of collodion printing by Bi Sheng in the Song Dynasty, woodcut printing by Wang<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[185],"tags":[],"class_list":["post-7874","post","type-post","status-publish","format-standard","hentry","category-photoinitiator"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>UV Letterpress Ink \u2013 Photoinitiator - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"Letterpress is one of the earliest printing methods utilized in the printing industry, with the invention of collodion printing by Bi Sheng in the Song...\" \/>\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\/pt\/uv-letterpress-ink-photoinitiator\/\" \/>\n<meta property=\"og:locale\" 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