{"id":9523,"date":"2026-08-24T17:57:14","date_gmt":"2026-08-24T17:57:14","guid":{"rendered":"https:\/\/postpacksl.com\/?p=9523"},"modified":"2026-08-24T17:57:14","modified_gmt":"2026-08-24T17:57:14","slug":"double-fold-sealing-test-ensuring-seal-quality-in-flexible-packaging","status":"publish","type":"post","link":"https:\/\/postpacksl.com\/en\/double-fold-sealing-test-ensuring-seal-quality-in-flexible-packaging\/","title":{"rendered":"Double-Fold Sealing Test: Ensuring Seal Quality in Flexible Packaging"},"content":{"rendered":"<p>In the <strong>flexible packaging<\/strong> industry, sealing quality is a key factor in ensuring the integrity, safety and final appearance of a package.<\/p>\n<p>It is not enough for a machine to be able to form and fill a bag at a specific production speed. The packaging process must also achieve a <strong>uniform, strong seal adapted to the material and type of package<\/strong>.<\/p>\n<p>For this reason, at <strong>Postpack<\/strong>, we carry out specific tests and trials of different packaging solutions before defining the final parameters for each application.<\/p>\n<p>In this case, we are conducting a <strong>double-fold sealing test<\/strong>, a trial that allows us to analyse how the package closure performs and optimise the process to achieve the expected results.<\/p>\n<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/lGM7GJ8rfFI?si=RHSEvhy_uMWmEYgy\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Why is it important to carry out a sealing test?<\/h2>\n<p><strong>Sealing is one of the most critical stages of any flexible packaging process.<\/strong> A closure that appears to be correct may not perform as required when subjected to different production, handling, transportation or storage conditions.<\/p>\n<p>For this reason, carrying out tests before moving to industrial production allows us to assess the actual performance of the package and adjust the machine parameters accordingly.<\/p>\n<h3>What factors do we analyse during a sealing test?<\/h3>\n<p>During a packaging trial, we analyse different factors that can directly influence the final result:<\/p>\n<ul>\n<li><strong>Seal uniformity<\/strong>.<\/li>\n<li><strong>Seal strength<\/strong>.<\/li>\n<li>The visual finish of the package.<\/li>\n<li>Correct bag formation.<\/li>\n<li>Material behaviour during the process.<\/li>\n<li>Adaptation of the machine parameters to the material being used.<\/li>\n<li>Process stability during production.<\/li>\n<\/ul>\n<p>The objective is to find the right combination of <strong>material, bag format, temperature, pressure, sealing time and production speed<\/strong>.<\/p>\n<p>This allows us to determine the most appropriate parameters to achieve a stable and repeatable packaging process.<\/p>\n<h2>What is double-fold sealing?<\/h2>\n<p><strong>Double-fold sealing<\/strong> is a package closure configuration that must be adapted to the geometry of the bag, the material being used and the specific characteristics of each application.<\/p>\n<p>In <strong>flexible packaging<\/strong> applications, small changes in package configuration can have a significant impact on the final result.<\/p>\n<p>Therefore, before taking a solution into production, it is important to check how the complete system performs:<\/p>\n<p><strong>Material + bag + product + sealing parameters + packaging machine.<\/strong><\/p>\n<p>Each application may require different adjustments.<\/p>\n<p>What works correctly with one particular material or format does not necessarily deliver the same result with another. This is why packaging trials and tests are an important part of developing an industrial solution.<\/p>\n<h3>The importance of the material in the sealing process<\/h3>\n<p>The type of film used can directly influence sealing performance.<\/p>\n<p>Different material structures may require different temperature, pressure and contact-time conditions in order to achieve an adequate seal.<\/p>\n<p>For this reason, the <strong>flexible packaging machine must be able to adapt to the characteristics of the material and bag format<\/strong>.<\/p>\n<h2>From laboratory testing to industrial production<\/h2>\n<p>A test of this type is not only intended to check whether the bag is properly closed.<\/p>\n<p>The real objective is to <strong>optimise the packaging process so that it can operate consistently and reliably in industrial production<\/strong>.<\/p>\n<p>During testing, we can modify different parameters until we find the appropriate operating point for each application.<\/p>\n<p>This makes it possible to identify potential problems before starting industrial production and to develop a more reliable and optimised solution.<\/p>\n<p>At <strong>Postpack<\/strong>, we understand the development of a packaging solution as a process in which the machinery must adapt to the specific requirements of each product and application.<\/p>\n<h3>What do we achieve through packaging trials?<\/h3>\n<p>Carrying out preliminary tests allows us to:<\/p>\n<ul>\n<li>Assess material performance.<\/li>\n<li>Validate the bag format.<\/li>\n<li>Optimise sealing parameters.<\/li>\n<li>Analyse seal quality.<\/li>\n<li>Identify potential problems during the process.<\/li>\n<li>Define an appropriate production configuration.<\/li>\n<li>Improve process stability and repeatability.<\/li>\n<\/ul>\n<h2>The importance of flexible packaging machinery<\/h2>\n<p><strong>Flexible packaging machines<\/strong> need to work with different types of materials, formats and products.<\/p>\n<p>In sectors such as the food industry, we find a wide variety of products, from dry and granular products to powders and products with specific characteristics. In these applications, machinery flexibility is particularly important.<\/p>\n<p>The machine must be able to maintain a <strong>stable and repeatable process<\/strong>, while ensuring the quality of the final package.<\/p>\n<p>For this reason, aspects such as the bag forming system, dosing system, film handling and, particularly, the sealing system are all part of the same packaging process.<\/p>\n<p><!-- VIDEO 2 --><\/p>\n<h3>A packaging solution must adapt to the product<\/h3>\n<p>Not every product requires the same packaging solution.<\/p>\n<p>The bag format, film type, dosing system, production speed and product characteristics can all determine which machine configuration is most suitable.<\/p>\n<p>That is why, at <strong>Postpack<\/strong>, we study each application individually to find the <strong>packaging machinery<\/strong> solution that best meets the manufacturer&#8217;s requirements.<\/p>\n<h2>Testing before production<\/h2>\n<p>Trials of this type are an important part of the way we work at <strong>Postpack<\/strong>.<\/p>\n<p>Before defining a packaging solution, we can carry out tests using different materials, formats and configurations to understand how the application performs.<\/p>\n<h3>1. Analyse the material<\/h3>\n<p>Each film can have different characteristics and may require specific sealing parameters.<\/p>\n<h3>2. Check the format<\/h3>\n<p>The geometry and dimensions of the bag directly influence the forming and sealing process.<\/p>\n<h3>3. Optimise the sealing process<\/h3>\n<p>Temperature, pressure, sealing time and production speed must be correctly adjusted to achieve a uniform seal that meets the requirements of the application.<\/p>\n<h3>4. Validate the result<\/h3>\n<p>The final package must meet the required quality and strength specifications for the product and its subsequent handling.<\/p>\n<h3>5. Prepare the industrial solution<\/h3>\n<p>Once the process has been defined, the parameters obtained during testing can be transferred to a production solution.<\/p>\n<p>This allows the manufacturer to start up the line with a process that has already been tested and optimised.<\/p>\n<h2>Packaging technology for the food industry<\/h2>\n<p>Innovation in packaging is not only about increasing production speed.<\/p>\n<p>It is also about achieving processes that are <strong>more precise, stable, efficient and adapted to each product<\/strong>.<\/p>\n<p>At <strong>Postpack<\/strong>, we develop <strong>flexible packaging machinery<\/strong> solutions for different formats and applications across sectors such as:<\/p>\n<ul>\n<li>Food industry.<\/li>\n<li>Pet food.<\/li>\n<li>Food supplements.<\/li>\n<li>Chemical products.<\/li>\n<li>Cosmetics.<\/li>\n<li>Agricultural products.<\/li>\n<li>Other products requiring specific packaging solutions.<\/li>\n<\/ul>\n<p>Our objective is to combine our machine technology with the real requirements of each application.<\/p>\n<h3>Flexible packaging machinery for different applications<\/h3>\n<p>Our experience across different industries allows us to work with a wide range of formats and production requirements.<\/p>\n<p>From bags designed for food products to applications requiring specific dosing and sealing systems, each project requires a prior analysis of the product and material characteristics.<\/p>\n<p>Carrying out tests allows us to find the appropriate configuration before transferring the solution into production.<\/p>\n<h2>Postpack will be at FoodTech Barcelona<\/h2>\n<p>All this work in development, testing and optimisation is directly connected to one of the industry&#8217;s major challenges: achieving <strong>more efficient, flexible packaging solutions adapted to the needs of each manufacturer<\/strong>.<\/p>\n<p>That is why, in October 2026, we will be exhibiting at <strong>FoodTech Barcelona from 6 to 8 October (Barcelona \u2013 Gran Via | Hall 2)<\/strong>, one of the leading international events dedicated to technology, machinery and solutions for the food industry.<\/p>\n<p>The trade fair will be a great opportunity to present our <strong>flexible packaging solutions<\/strong>, discuss new applications and show how we can adapt our machines to the specific requirements of each project.<\/p>\n<h3><a href=\"https:\/\/www.alimentariafoodtech.com\/\" target=\"_blank\" rel=\"noopener\">Visit us at FoodTech Barcelona<\/a><\/h3>\n<p>If you would like to discover our flexible packaging machinery solutions and discuss a specific application with our team, we will be delighted to meet you at FoodTech Barcelona.<\/p>\n<p><strong>Do you have a packaging application you would like to test?<\/strong><\/p>\n<p>Every product and every material presents its own challenges.<\/p>\n<p>That is why, rather than simply looking for a standard machine, it is important to <strong>study the complete process and assess how the application performs<\/strong>.<\/p>\n<p>At Postpack, we can analyse the characteristics of your product, material and packaging format to identify the most suitable packaging solution.<\/p>\n<h3>Would you like to know how we can adapt a packaging solution to your product?<\/h3>\n<p><a href=\"https:\/\/postpacksl.com\/en\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact our team<\/a> and we will work with you to find a solution adapted to your production requirements.<\/p>\n<p><strong>Postpack \u2014 Flexible packaging solutions for industry.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the flexible packaging industry, sealing quality is a key factor in ensuring the integrity, safety and final appearance of a package. It is not&#8230;<\/p>\n","protected":false},"author":7,"featured_media":9522,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_joinchat":[],"footnotes":""},"categories":[134,136],"tags":[],"class_list":["post-9523","post","type-post","status-publish","format-standard","has-post-thumbnail","category-events","category-food"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Double-Fold Sealing Test: Ensuring Seal Quality<\/title>\n<meta name=\"description\" content=\"Double-Fold Sealing Test: Ensuring Seal Quality in Flexible Packaging. 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