{"id":3096,"date":"2026-07-15T09:19:38","date_gmt":"2026-07-15T09:19:38","guid":{"rendered":"https:\/\/szfilmfactory.com\/?p=3096"},"modified":"2026-07-15T09:19:41","modified_gmt":"2026-07-15T09:19:41","slug":"bopp-film-corona-treatment-decay-solutions","status":"publish","type":"post","link":"https:\/\/szfilmfactory.com\/ru\/blog\/bopp-film-corona-treatment-decay-solutions\/","title":{"rendered":"Fixing Ink Adhesion Issues: Why Your BOPP Film Needs 38 Dyne\/cm Corona Treatment"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>BOPP film needs a stable corona level above 38 dyne\/cm to achieve reliable ink adhesion, because low surface energy prevents ink from properly bonding with the film surface.<\/strong> When corona treatment weakens over time, printers may see problems such as ink peeling, poor print quality, uneven colors, and customer complaints. Understanding corona decay and controlling surface energy are key steps for stable BOPP printing performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For BOPP film manufacturers, converters, and printers, corona treatment is not just a production step. It is a critical surface modification process that directly affects printing results.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SZ Film Factory produces high-quality BOPP and PET films with controlled surface treatment performance to help customers reduce printing failures and improve production efficiency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Need BOPP film with stable corona performance? <a href=\"https:\/\/szfilmfactory.com\/ru\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact SZ Film Factory<\/a> for technical support.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Is Corona Treatment and Why Does It Matter in BOPP Printing?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Corona treatment improves BOPP film surface energy so ink can spread and bond effectively.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BOPP (Biaxially Oriented Polypropylene) film has excellent strength, transparency, and moisture resistance. However, polypropylene is naturally a low surface energy material. Its chemical structure makes it difficult for printing inks, coatings, and adhesives to attach directly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/szfilmfactory.com\/ru\/blog\/bopp-film-corona-treatment\/\" target=\"_blank\" rel=\"noreferrer noopener\">Corona treatment<\/a><\/strong> uses high-voltage electrical discharge to change the film surface. The process creates polar groups on the film surface and increases surface energy.<\/p>\n\n\n\n<figure data-spectra-id=\"spectra-mrltl0s9-t4nfix\" class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"413\" src=\"https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/bopp-film-Corona-Treatment.jpg\" alt=\"bopp film corona treatment\" class=\"wp-image-3104\" title=\"Fixing Ink Adhesion Issues: Why Your BOPP Film Needs 38 Dyne\/cm Corona Treatment\" srcset=\"https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/bopp-film-Corona-Treatment.jpg 600w, https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/bopp-film-Corona-Treatment-300x207.jpg 300w, https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/bopp-film-Corona-Treatment-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/nobelusuniversity.com\/2023\/05\/25\/what-is-corona-treatment\/\" target=\"_blank\" rel=\"noreferrer noopener\"><em>What Is Corona Treatment?<\/em><\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A higher surface energy allows:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Better ink wetting<\/li>\n\n\n\n<li>Stronger ink adhesion<\/li>\n\n\n\n<li>More uniform printing<\/li>\n\n\n\n<li>Better coating performance<\/li>\n\n\n\n<li>Reduced ink failure risks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For BOPP printing applications, a corona level of <strong>38 dyne\/cm or higher is generally recommended<\/strong> because this level provides a safer surface condition for most printing inks.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why Must BOPP Corona Levels Stay Above 38 Dyne\/cm?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Maintaining corona levels above 38 dyne\/cm helps ensure stable ink bonding and prevents printing defects.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The dyne level represents the surface energy of the film. A higher dyne value means the film surface is easier for liquids like ink and adhesive to wet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When the corona value drops below 38 dyne\/cm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ink may not spread evenly<\/li>\n\n\n\n<li>Ink layers may become weak<\/li>\n\n\n\n<li>Printed images may lose sharpness<\/li>\n\n\n\n<li>Ink can scratch or peel easily<\/li>\n\n\n\n<li>Adhesive strength may decrease during lamination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The problem is that BOPP film does not always lose corona performance immediately. A film may show good corona treatment right after production but experience surface energy loss during storage and transportation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is called <strong>corona decay <\/strong>or<strong> corona aging<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key Fact:<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">BOPP film requires stable surface energy because polypropylene naturally has low polarity. Corona treatment increases surface polarity, but the effect can decrease over time due to molecular migration and surface recovery.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What Causes Corona Retention Loss in BOPP Film?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Corona retention decreases because the treated surface gradually returns toward its original low-energy state.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Several factors can accelerate corona decay:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Molecular Migration<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Additive migration is one of the main reasons BOPP corona levels decrease over time.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BOPP films often contain additives such as slip agents and anti-block agents. These materials can move from inside the film toward the surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When additives cover the treated surface:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Surface polarity decreases<\/li>\n\n\n\n<li>Ink wetting becomes weaker<\/li>\n\n\n\n<li>Dyne levels drop<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is why a BOPP roll may print well immediately after production but fail after several months of storage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Storage Time<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Long storage periods can reduce BOPP surface energy.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Corona treatment is not permanent. The dyne level usually decreases gradually after treatment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Factors affecting storage decay include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Film formulation<\/li>\n\n\n\n<li>Initial corona strength<\/li>\n\n\n\n<li>Storage temperature<\/li>\n\n\n\n<li>Humidity conditions<\/li>\n\n\n\n<li>Packaging protection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/szfilmfactory.com\/ru\/blog\/bopp-film-rainy-season-storage-and-production-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\">Proper storage management<\/a> is important for maintaining printing performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Low Initial Corona Treatment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Insufficient corona treatment during production creates unstable printing performance later.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the film leaves production with a borderline corona value, even small surface changes can push it below the required level.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Initial corona: 39 dyne\/cm<\/li>\n\n\n\n<li>After storage loss: 36\u201337 dyne\/cm<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The film may then show poor ink adhesion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At <strong><a href=\"https:\/\/szfilmfactory.com\/ru\/about\/\" target=\"_blank\" rel=\"noreferrer noopener\">SZ Film Factory<\/a><\/strong>, production control focuses on stable corona treatment levels to reduce performance changes during customer use.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Detect Corona Decay in BOPP Film<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Regular dyne testing is the most effective way to identify corona loss before printing problems occur.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common testing method is the <strong>dyne pen test<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/www.brighton-science.com\/what-is-dyne-testing\" target=\"_blank\" rel=\"noreferrer noopener\">Dyne Pen Test<\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Dyne pens provide a quick method to check whether the BOPP surface can accept ink properly.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The testing process is simple:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Clean the film surface<\/li>\n\n\n\n<li>Apply dyne solution to the film<\/li>\n\n\n\n<li>Observe the liquid behavior<\/li>\n\n\n\n<li>Check whether the line remains continuous<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If the liquid breaks into small droplets quickly, the surface energy is too low.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A stable continuous line indicates better wetting performance.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Eltech Corona Treatment &amp; Dyne Testing | Surface Energy Measurement &amp; Quality Check\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/DPquOfOIaWI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Contact Angle Testing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Contact angle measurement provides a more accurate analysis of BOPP surface energy.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This method measures how a liquid drop behaves on the film surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A smaller contact angle usually means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Better surface wetting<\/li>\n\n\n\n<li>Higher surface energy<\/li>\n\n\n\n<li>Better ink adhesion potential<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This test is often used for laboratory quality control and product development.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Test Before Printing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Testing corona levels before printing prevents expensive production failures.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Converters should check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incoming BOPP rolls<\/li>\n\n\n\n<li>Long-stored materials<\/li>\n\n\n\n<li>Different production batches<\/li>\n\n\n\n<li>Materials used for high-quality printing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Early detection helps avoid:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Waste printing rolls<\/li>\n\n\n\n<li>Machine downtime<\/li>\n\n\n\n<li>Customer complaints<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Need help checking BOPP corona performance? <a href=\"https:\/\/szfilmfactory.com\/ru\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact SZ Film Factory<\/a> for professional film recommendations.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix Low Corona Retention Problems in BOPP Printing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Low corona problems can be solved through proper film selection, surface treatment control, and production adjustments.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Use Fresh Corona-Treated BOPP Film<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Using recently treated film reduces the risk of surface energy loss.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For sensitive printing applications, avoid using old inventory without testing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recommended actions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check production date<\/li>\n\n\n\n<li>Test dyne level before printing<\/li>\n\n\n\n<li>Use proper storage conditions<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Apply Online Corona Treatment Before Printing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Additional corona treatment before printing can restore surface energy.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Many printing lines include corona treatment units before printing stations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This can improve:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ink adhesion<\/li>\n\n\n\n<li>Coating uniformity<\/li>\n\n\n\n<li>Printing stability<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">However, excessive corona treatment should be avoided because it may damage the film surface or create other quality issues.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Choose BOPP Film Designed for Printing<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Printing-grade BOPP film provides better corona retention and more stable performance.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A high-quality printing BOPP film should have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Controlled additive formulation<\/li>\n\n\n\n<li>Stable surface treatment<\/li>\n\n\n\n<li>Consistent dyne level<\/li>\n\n\n\n<li>Good aging resistance<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">SZ Film Factory provides BOPP and PET films for printing, packaging, and lamination applications with customized solutions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How SZ Film Factory Helps Prevent BOPP Printing Failures<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SZ Film Factory focuses on producing <a href=\"https:\/\/szfilmfactory.com\/ru\/films\/\" target=\"_blank\" rel=\"noreferrer noopener\">BOPP and PET films<\/a> with reliable surface performance and consistent quality control.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our production process focuses on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stable corona treatment<\/li>\n\n\n\n<li>Controlled film formulation<\/li>\n\n\n\n<li>Quality inspection<\/li>\n\n\n\n<li>Customer application support<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">We understand that film performance is not only about appearance. Surface properties directly affect your printing efficiency and final product quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Whether you need BOPP film for flexible packaging, labels, lamination, or printing applications, stable corona retention is essential.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Looking for reliable printing-grade BOPP film? <a href=\"https:\/\/szfilmfactory.com\/ru\/contact\/\" target=\"_blank\" rel=\"noreferrer noopener\">Get in touch<\/a> with SZ Film Factory for technical advice.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions About BOPP Corona Retention<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is the ideal corona level for BOPP printing?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A corona level above 38 dyne\/cm is commonly recommended for stable BOPP printing performance.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Some applications may require higher levels depending on ink type, coating system, and printing method.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">How long does corona treatment last on BOPP film?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Corona treatment can decrease over time, and the retention period depends on film formulation, storage conditions, and treatment level.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Always test stored film before printing.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Can low corona levels cause ink peeling?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Yes, low corona levels can cause weak ink adhesion, resulting in peeling, scratching, and poor print quality.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The ink cannot properly wet and bond with a low-energy BOPP surface.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Improve Your BOPP Printing Reliability with SZ Film Factory<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Stable corona retention starts with choosing the right BOPP film supplier and controlling surface energy throughout the process.<\/strong> If your BOPP film shows ink adhesion problems, low dyne values, or inconsistent printing results, SZ Film Factory can help analyze your application and recommend suitable BOPP or PET film solutions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contact our team at <strong><a href=\"mailto:info@szfilmfactory.com\" data-type=\"mailto\" data-id=\"mailto:info@szfilmfactory.com\" target=\"_blank\" rel=\"noreferrer noopener\">info@szfilmfactory.com<\/a><\/strong> for technical consultation, request a <strong><a href=\"https:\/\/szfilmfactory.com\/ru\/quote\/\" target=\"_blank\" rel=\"noreferrer noopener\">Get a Quote<\/a><\/strong> through our contact form, or <a href=\"https:\/\/szfilmfactory.com\/ru\/book-a-visit\/\" target=\"_blank\" rel=\"noreferrer noopener\">arrange a factory visit<\/a> to learn more about our film production capabilities.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choose SZ Film Factory for reliable BOPP and PET films designed for better printing performance, stronger adhesion, and stable production results.<\/p>","protected":false},"excerpt":{"rendered":"<p>Low corona retention can reduce BOPP ink adhesion and cause printing defects. Learn why 38+ dyne\/cm matters, how to test corona levels, and how to prevent treatment decay.<\/p>","protected":false},"author":1,"featured_media":3106,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","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":[29],"tags":[31,44],"class_list":["post-3096","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-studies-tech-support","tag-bopp-film","tag-corona-treatment"],"uagb_featured_image_src":{"full":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38.jpg",500,500,false],"thumbnail":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38-150x150.jpg",150,150,true],"medium":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38-300x300.jpg",300,300,true],"medium_large":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38.jpg",500,500,false],"large":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38.jpg",500,500,false],"1536x1536":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38.jpg",500,500,false],"2048x2048":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38.jpg",500,500,false],"trp-custom-language-flag":["https:\/\/szfilmfactory.com\/wp-content\/uploads\/2026\/07\/Corona-Treatment-38-12x12.jpg",12,12,true]},"uagb_author_info":{"display_name":"Ivy","author_link":"https:\/\/szfilmfactory.com\/ru\/blog\/author\/szfilmoutlook-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Low corona retention can reduce BOPP ink adhesion and cause printing defects. Learn why 38+ dyne\/cm matters, how to test corona levels, and how to prevent treatment decay.","_links":{"self":[{"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/posts\/3096","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/comments?post=3096"}],"version-history":[{"count":9,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/posts\/3096\/revisions"}],"predecessor-version":[{"id":3107,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/posts\/3096\/revisions\/3107"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/media\/3106"}],"wp:attachment":[{"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/media?parent=3096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/categories?post=3096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/szfilmfactory.com\/ru\/wp-json\/wp\/v2\/tags?post=3096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}