{"id":2349,"date":"2026-02-03T15:36:34","date_gmt":"2026-02-03T14:36:34","guid":{"rendered":"https:\/\/www.gopack.it\/en\/?post_type=magazine&#038;p=2349"},"modified":"2026-02-03T15:44:45","modified_gmt":"2026-02-03T14:44:45","slug":"how-does-heat-sealing-work-in-food-packaging","status":"publish","type":"magazine","link":"https:\/\/www.gopack.it\/en\/food-packaging-news\/how-does-heat-sealing-work-in-food-packaging\/","title":{"rendered":"How does heat sealing work in food packaging?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Heat sealing is one of the most widely used technologies in modern food packaging. Reliable, safe and versatile, it allows you to package fresh, ready-made or semi-finished products ensuring hygiene, protection and a longer shelf life. More and more food companies, from pasta factories to dairies, from delicatessens to ready-made meal manufacturers, are choosing this technique to improve the efficiency, presentation, and safety of their packaging. But how exactly does heat sealing work?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What\u2019s heat sealing in food packaging<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Heat sealing is a process that joins a container (usually a PP, PET or multi-layer material tray) to a <strong>heat sealable film<\/strong> through the controlled application of <strong>heat and pressure<\/strong>. This allows the package to be closed tightly, protecting the food from external contamination and maintaining its organoleptic properties.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The result is a safe, tidy and durable packaging, ideal for both the refrigerated counter of the large-scale distribution and for take-out in the restaurant.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How the heat sealing process occurs<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The operation can be summarized in four main steps:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Preparing the tray<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The tray is filled with food (fresh pasta, meat, vegetables, poke, ready meals, cheeses, etc.) and placed in the heat sealer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Application of film<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A specific film \u2014 usually PET, PP or barrier material \u2014 is unfolded over the tray, ready to be sealed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Pressure and heat<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The machine lowers a heated plate which exerts:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>controlled heat<\/strong>,<\/li>\n\n\n\n<li><strong>constant pressure<\/strong>,<\/li>\n\n\n\n<li><strong>a predetermined contact tim<\/strong>e.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The film adheres to the surface of the tray creating an <strong>airtight seal<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. Finishing and cutting<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The machine cuts out the excess film and releases the sealed tray, ready for labelling, secondary packaging and distribution.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Heat sealing with modified atmosphere (MAP \/ ATM)<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">One of the most advanced versions of heat sealing is <strong>modified atmosphere packaging<\/strong>, known as MAP or ATM. Before sealing, the air in the tray is replaced with a mixture of food gases (usually oxygen, nitrogen and CO\u2082) which:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>slows microbial growth,<\/li>\n\n\n\n<li>maintains color and freshness,<\/li>\n\n\n\n<li>prolongs shelf life.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s the preferred technology for fresh pasta, meat, fish, over-the-counter products and gastronomy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What advantages does heat sealing offer?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Heat sealing is chosen because it guarantees:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High hygiene safety<\/strong><\/li>\n\n\n\n<li><strong>Airtight and durable closure<\/strong>, ideal for transport and storage<\/li>\n\n\n\n<li><strong>Impeccable presentation<\/strong> and product visibility<\/li>\n\n\n\n<li><strong>Reduction of waste<\/strong> thanks to the extension of the duration<\/li>\n\n\n\n<li><strong>Compatibility with sustainable and recyclable materials<\/strong><\/li>\n\n\n\n<li><strong>Customization options<\/strong> (graphics, formats, thicknesses)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">GoPack offers a wide range of certified heat sealable trays, specific films and solutions with EVOH barrier or bio materials.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>GoPack: partner for a professional heat sealing<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Choosing heat sealing is only convenient when combined with quality materials.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GoPack provides:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Heat-sealable trays in PP, PET, R-PET, bio and multilayer<\/strong><\/li>\n\n\n\n<li>High performance <strong>heat sealable films<\/strong><\/li>\n\n\n\n<li><strong>Free samples<\/strong> for machinery testing<\/li>\n\n\n\n<li><strong>Technical consultancy<\/strong> to identify the most suitable solution for the product<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Heat sealing is a simple yet powerful technology, capable of ensuring safety, freshness and professionalism. With GoPack\u2019s solutions, every product is protected, valued and ready to reach the consumer in the best way.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false},"categoria-magazine":[],"class_list":["post-2349","magazine","type-magazine","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.gopack.it\/en\/wp-json\/wp\/v2\/magazine\/2349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gopack.it\/en\/wp-json\/wp\/v2\/magazine"}],"about":[{"href":"https:\/\/www.gopack.it\/en\/wp-json\/wp\/v2\/types\/magazine"}],"wp:attachment":[{"href":"https:\/\/www.gopack.it\/en\/wp-json\/wp\/v2\/media?parent=2349"}],"wp:term":[{"taxonomy":"categoria-magazine","embeddable":true,"href":"https:\/\/www.gopack.it\/en\/wp-json\/wp\/v2\/categoria-magazine?post=2349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}