{"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&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

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

What\u2019s heat sealing in food packaging<\/strong><\/h2>\n\n\n\n

Heat sealing is a process that joins a container (usually a PP, PET or multi-layer material tray) to a heat sealable film<\/strong> through the controlled application of 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

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

How the heat sealing process occurs<\/strong><\/h2>\n\n\n\n

The operation can be summarized in four main steps:<\/p>\n\n\n\n

1. Preparing the tray<\/strong><\/p>\n\n\n\n

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

2. Application of film<\/strong><\/p>\n\n\n\n

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

3. Pressure and heat<\/strong><\/p>\n\n\n\n

The machine lowers a heated plate which exerts:<\/p>\n\n\n\n

    \n
  • controlled heat<\/strong>,<\/li>\n\n\n\n
  • constant pressure<\/strong>,<\/li>\n\n\n\n
  • a predetermined contact tim<\/strong>e.<\/li>\n<\/ul>\n\n\n\n

    The film adheres to the surface of the tray creating an airtight seal<\/strong>.<\/p>\n\n\n\n

    4. Finishing and cutting<\/strong><\/p>\n\n\n\n

    The machine cuts out the excess film and releases the sealed tray, ready for labelling, secondary packaging and distribution.<\/p>\n\n\n\n

    Heat sealing with modified atmosphere (MAP \/ ATM)<\/strong><\/h2>\n\n\n\n

    One of the most advanced versions of heat sealing is 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

      \n
    • slows microbial growth,<\/li>\n\n\n\n
    • maintains color and freshness,<\/li>\n\n\n\n
    • prolongs shelf life.<\/li>\n<\/ul>\n\n\n\n

      It\u2019s the preferred technology for fresh pasta, meat, fish, over-the-counter products and gastronomy.<\/p>\n\n\n\n

      What advantages does heat sealing offer?<\/strong><\/h2>\n\n\n\n

      Heat sealing is chosen because it guarantees:<\/p>\n\n\n\n

        \n
      • High hygiene safety<\/strong><\/li>\n\n\n\n
      • Airtight and durable closure<\/strong>, ideal for transport and storage<\/li>\n\n\n\n
      • Impeccable presentation<\/strong> and product visibility<\/li>\n\n\n\n
      • Reduction of waste<\/strong> thanks to the extension of the duration<\/li>\n\n\n\n
      • Compatibility with sustainable and recyclable materials<\/strong><\/li>\n\n\n\n
      • Customization options<\/strong> (graphics, formats, thicknesses)<\/li>\n<\/ul>\n\n\n\n

        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

        GoPack: partner for a professional heat sealing<\/strong><\/h2>\n\n\n\n

        Choosing heat sealing is only convenient when combined with quality materials.<\/p>\n\n\n\n

        GoPack provides:<\/p>\n\n\n\n

          \n
        • Heat-sealable trays in PP, PET, R-PET, bio and multilayer<\/strong><\/li>\n\n\n\n
        • High performance heat sealable films<\/strong><\/li>\n\n\n\n
        • Free samples<\/strong> for machinery testing<\/li>\n\n\n\n
        • Technical consultancy<\/strong> to identify the most suitable solution for the product<\/li>\n<\/ul>\n\n\n\n

          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":[],"yoast_head":"\nHeat sealing food packaging: how it works<\/title>\n<meta name=\"description\" content=\"Heat sealing food packaging: process, benefits and materials for a safe and professional closure. 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