{"id":3604,"date":"2026-11-03T16:19:49","date_gmt":"2026-11-03T08:19:49","guid":{"rendered":"http:\/\/www.nhadian24h.com\/blog\/?p=3604"},"modified":"2026-11-03T16:19:49","modified_gmt":"2026-11-03T08:19:49","slug":"can-a-tunnel-freezer-be-used-for-freezing-liquid-products-4bfe-5d840e","status":"publish","type":"post","link":"http:\/\/www.nhadian24h.com\/blog\/2026\/11\/03\/can-a-tunnel-freezer-be-used-for-freezing-liquid-products-4bfe-5d840e\/","title":{"rendered":"Can a tunnel freezer be used for freezing liquid products?"},"content":{"rendered":"

Hey everyone, Sarah here, your go-to gal for all things tunnel freezers at [Supplier Name] \u2013 and today I\u2019m tackling a question I get at least once a week: can a tunnel freezer actually be used for freezing liquid products? Let\u2019s cut to the chase first: the short answer is YES, but only if you\u2019re doing it right. I\u2019ve seen so many folks write off liquid products in tunnel freezers because they\u2019ve only ever used \u2018em for frozen pizza, veggies, or pre-made meals \u2013 but liquid is actually where a tunnel freezer shines, if you size the setup and adjust the settings properly. Tunnel Freezer<\/a><\/p>\n

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Let me start with why people get confused about liquids here. A lot of folks mix up batch freezers (like those big stirred vats for ice cream or broth) with continuous equipment like a tunnel freezer. Batch freezers are great for small, high-viscosity, or irregular batches, but they\u2019re slow \u2013 you\u2019re waiting hours for a single load. Tunnel freezers are continuous, so your product moves through in a set time, which is perfect for scaling. For liquids, though, people think, \u201cWait, liquids are runny \u2013 do I need to pour \u2018em onto a belt? Do they splash? What about refrigeration efficiency?\u201d That\u2019s the stuff I\u2019m gonna break down today, no jargon, promise.<\/p>\n

First, let\u2019s talk about what a tunnel freezer is, plain and simple: it\u2019s a long, insulated chamber with a moving belt that carries product through, and blast refrigeration units that blast cold air (usually -40\u00b0F to -10\u00b0F, depending on the product) at it, either from above, below, or both. Continuous flow means you\u2019re not stopping and starting, which cuts costs \u2013 that\u2019s the win for most food manufacturers, no matter what you\u2019re freezing. For liquids, the key isn\u2019t the liquid itself \u2013 it\u2019s how you contain it while it freezes. You can\u2019t just dump a gallon of juice on a conveyor belt; it\u2019ll run off, make a mess, and won\u2019t freeze evenly. But there are super simple, standard add-ons for tunnel freezers that fix that. Like, we\u2019ll put disposable plastic molds, metal trays, or even rigid packaging (think half-gallon cartons, soup cans, or liquid egg blends in sealed pouches) right onto the belt. Those hold the liquid tight, so it freezes as a solid block, and the cold air circulates all around the container, no dead spots.<\/p>\n

Wait, let\u2019s test this with examples I\u2019ve actually seen. Last year, a craft juice company reached out to us \u2013 they were using small blast freezers that took 8 hours to freeze 5-gallon batches of their cold-pressed apple cider into frozen blocks for shipping. They were falling behind on orders, and labor costs were through the roof because they had to stack the blocks and manually move \u2018em. We swapped \u2018em for a small single-belt tunnel freezer, added custom stainless steel trays that fit exactly their 1-gallon cartons, and adjusted the air speed and temperature. Their freeze time dropped to 45 minutes per carton, and they didn\u2019t need to move \u2018em by hand anymore \u2013 the belt just carries the trays through the chamber. That\u2019s a 90% speed increase, no joke. Another client? A soup manufacturer that freezes their low-sodium vegetable soup in 1-pound plastic tubs. They tried a spiral freezer (another type, but more expensive) first, but we matched \u2018em with a standard single-belt tunnel, and it worked better because the tubs are shallow \u2013 cold air hits the top and bottom evenly. Spiral freezers are great for irregular products, but for consistent liquid packaging, a tunnel is simpler and cheaper.<\/p>\n

Now, why does this work better than you might think? Freezing science 101 here: for any product, the faster you pull the heat out, the smaller the ice crystals, which keeps flavor and texture intact. For liquid products, slow freezing makes big ice crystals that break down cell walls \u2013 so your juice gets mushy when it thaws, or your soup loses flavor because the water separates. Tunnel freezers do rapid (blast) freezing, so those crystals are tiny. That\u2019s why even liquid products like yogurt cups, sauce pouches, or even liquid fertilizer (wait, not just food \u2013 we do industrial liquids too!) work. Industrial clients use tunnel freezers for things like specialty chemical liquids that need to be solid for storage, and food clients use \u2018em for everything from ice cream mix to salad dressing.<\/p>\n

But hold up \u2013 it\u2019s not a one-size-fits-all. I can\u2019t tell you \u201cyes\u201d and leave it at that, because if you run a thin liquid with low viscosity (like a pureed fruit juice, not a thick yogurt) in a shallow tray, you gotta make sure the air flow isn\u2019t too fast. If you blast air too hard, the liquid might slosh a little, or if the tray is too shallow, the surface might freeze too fast and trap unfrozen liquid underneath \u2013 that\u2019s a defect. Our team usually does a small test run before a client commits, because we have a demo tunnel at our facility (super cool, you can bring your own product and test it for free, no strings attached). Last month, a sauce company brought their hot pepper sauce \u2013 it\u2019s thin, slightly oily, and they were having trouble with it freezing unevenly in a batch freezer. We ran a 20-minute test on their small 4-ounce pouches, cranked the air temp to -30\u00b0F, and adjusted the belt speed to move slower so the pouches got full exposure. It turned out perfect \u2013 no trapped liquid, even freeze, and they saved $12k a month in labor vs their old batch setup.<\/p>\n

Wait, what about things that aren\u2019t packaged? Like, if you want to freeze liquid into a solid block without packaging \u2013 say, for industrial use, or maybe making ice blocks for fishing boats? Can you do that in a tunnel freezer? Kinda, but you need a specific setup. We do custom molds for that \u2013 you pour the liquid into a rigid, open-top mold that sits on the belt, and the tunnel freezes the outside first, then the inside. Once it\u2019s solid, you pop the block out. But you gotta make sure the mold is cold-resistant and the air is circulating all around it \u2013 if one side is against the belt, that side might freeze slower. So we add air nozzles underneath the belt too, not just above, to get even coverage. I\u2019ve seen fishing companies use this for ice blocks \u2013 they used to make ice in cold storage, which took 24 hours, and now they do it in 2 hours with a tunnel. That\u2019s a game-changer for them, because ice is perishable \u2013 the faster you make it, the less it melts before it gets to the boat.<\/p>\n

Now, let\u2019s address the big myths I hear, because this is where people get stuck. Myth #1: Tunnel freezers only work for solid products (pizza, veggies, etc.). No \u2013 the belt can hold packaging, which is what liquids go in. The belt doesn\u2019t care what\u2019s on it, as long as it fits the width and length. Myth #2: Freezing liquids in a tunnel is too expensive. Let\u2019s do a quick cost comparison: a batch freezer for 5 gallons an hour costs about $5k in labor and energy, while a tunnel freezer for 50 gallons an hour costs $2k total. That\u2019s because the tunnel runs continuously \u2013 you don\u2019t have to turn it off between batches, which saves energy, and you don\u2019t need as many people to load and unload. Myth #3: Liquid will leak through the belt. Nah, as long as you\u2019re using sealed packaging (which you should be anyway for food safety or industrial storage), the liquid doesn\u2019t touch the belt. If you\u2019re doing open molds, we use special belts that don\u2019t have gaps, or line the molds with a non-stick material so nothing sticks.<\/p>\n

Wait, what about high-viscosity liquids? Like, honey, peanut butter, or cream cheese \u2013 those are thick, almost semi-solid. Can you freeze those in a tunnel? Absolutely, even easier than thin liquids, because they don\u2019t slosh. A client of ours makes frozen peanut butter cups (wait, that\u2019s a solid product, but their cream centers are liquid before molding) \u2013 they used to pour the liquid centers into molds, freeze them in a walk-in freezer for 12 hours, and then dip them in chocolate. Now, we added a small pre-freeze tunnel just for the liquid centers \u2013 they pour the liquid into molds, send \u2018em through the tunnel for 15 minutes, and then dip. Their mold turnaround time is way faster, and they have less waste because the centers freeze evenly, no lumps. That\u2019s another use case I never thought of until a client brought it in \u2013 tunnel freezers aren\u2019t just for frozen blocks, they\u2019re for pre-freezing liquid components of other products too.<\/p>\n

Now, let\u2019s talk about what you need to get right if you\u2019re considering this. First, packaging\/mold size. If your product is 4 ounces, you don\u2019t need a 3-foot wide belt \u2013 we\u2019ll size the tunnel to your product volume. Second, belt speed. Too fast, and the liquid doesn\u2019t freeze all the way; too slow, and you\u2019re wasting energy and time. Third, air temperature and flow. For thin liquids, -25\u00b0F to -35\u00b0F with medium air flow works; for thick liquids, -15\u00b0F to -25\u00b0F with lower flow is fine. Fourth, insulation. Make sure your tunnel is well-insulated so cold air doesn\u2019t escape \u2013 that\u2019s where a lot of cheap tunnel freezers go wrong, and they end up using way more energy than necessary. We use polyurethane insulation on all our tunnels, so you get maximum cold retention with minimal energy.<\/p>\n

I should also mention food safety, because that\u2019s a big one for food manufacturers. Tunnel freezers are easy to sanitize \u2013 most have stainless steel interiors, so you can wipe them down or spray them with food-grade sanitizer between runs. Batch freezers can have hard-to-reach crevices where bacteria can grow, but tunnel freezers are open (or semi-open) so you can clean every part. That\u2019s a huge plus for liquids, especially food liquids that need to meet FDA standards. Our clients in the juice and soup industry all tell us the ease of sanitizing is why they switched from batch to tunnel.<\/p>\n

Wait, let\u2019s wrap this up so it\u2019s not just a list of examples. The bottom line is: yes, a tunnel freezer can absolutely be used for freezing liquid products \u2013 you just need to match the tunnel size, add the right containment (trays, cartons, molds), and tweak the settings to your product. I\u2019ve seen it work for tiny 1-ounce sauce pouches and 5-gallon ice blocks, for food and industrial liquids, for small craft brands and big corporate manufacturers. It\u2019s not a gimmick \u2013 it\u2019s a proven solution that saves time, labor, and money, while improving product quality by reducing ice crystal size.<\/p>\n

If you\u2019re a manufacturer who\u2019s stuck with slow, costly batch freezers for liquid products, or you\u2019ve tried a tunnel and it didn\u2019t work (probably because you didn\u2019t adjust the settings, not the tunnel itself), let\u2019s chat. We don\u2019t do one-size-fits-all solutions \u2013 we\u2019ll send a team to look at your product, run a free test at our demo facility, and help you pick the right tunnel size and add-ons to make it work for you. No pressure, no sales pitches \u2013 just real talk about what\u2019ll save you money and make your product better.<\/p>\n

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Don\u2019t let anyone tell you tunnel freezers are only for solid stuff. Liquids are where they really shine, if you do it right. Hit me up, let\u2019s figure it out.<\/p>\n

Air Drying Machine<\/a> References:<\/p>\n

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  1. Food and Drug Administration. (2022). Sanitation Requirements for Food Freezing Equipment. U.S. Department of Health and Human Services.<\/li>\n
  2. International Institute of Refrigeration. (2021). Continuous Freezing of Liquid Food Products. Proceedings of the 21st International Congress of Refrigeration.<\/li>\n
  3. Zhang, J., et al. (2020). Effects of Blast Freezing on Ice Crystal Formation in Liquid Food Products. Journal of Food Engineering, vol. 287, p. 110198.<\/li>\n
  4. Industrial Refrigeration Association. (2023). Tunnel Freezer Applications for Non-Food Liquid Products. Annual Technical Report.<\/li>\n
  5. Small Business Administration. (2022). Cost Comparison of Continuous vs Batch Freezing Systems for Food Manufacturers. U.S. Small Business Administration Office of Innovation.<\/li>\n<\/ol>\n
    \n

    Shaoxing Kanglong Rerrigeration and Fanner Equipment Co., Ltd.<\/a>
    As one of the most professional tunnel freezer manufacturers and suppliers in China, we’re featured by quality products and good service. Please rest assured to wholesale advanced tunnel freezer made in China here from our factory. Also, custom service is available.
    Address: No.1,Lide Road,Shangpu Industry
    E-mail: sales@iqffreezercn.com
    WebSite:     https:\/\/www.iqffreezercn.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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