{"id":5911,"date":"2026-03-10T16:53:20","date_gmt":"2026-03-10T08:53:20","guid":{"rendered":"https:\/\/en.ntsquare.com\/?post_type=case-study&p=5911"},"modified":"2026-03-11T15:25:36","modified_gmt":"2026-03-11T07:25:36","slug":"dumplings-freezing","status":"publish","type":"case-study","link":"https:\/\/en.ntsquare.com\/pt\/case-study\/dumplings-freezing\/","title":{"rendered":"Spiral Freezing Solution for Steamed Dumplings"},"content":{"rendered":"

Client Location:<\/strong> Chicago
Equipment Supplier:<\/strong> Square Technology Group Co., Ltd.<\/p>\n\n\n\n

IQF:<\/strong> Ambient spiral cooler& spiral freezer
Refrigeration System:<\/strong> Bitzer Compressor Unit& Evaporative condenser<\/p>\n\n\n\n

Project Overview<\/strong><\/p>\n\n\n\n

Square Technology Group supplied a customized spiral cooling and freezing system for a dumpling processing facility in Chicago.<\/p>\n\n\n\n

The upstream steaming machine was provided by another supplier. After steaming, dumplings exit the cooker at approximately 80\u00b0C<\/strong> and must undergo staged cooling before final freezing to ensure product quality and surface integrity.<\/p>\n\n\n\n

To achieve optimal results, Square designed a two-stage spiral system<\/strong>:<\/p>\n\n\n\n

    \n
  1. Ambient Spiral Cooler (Plastic Belt)<\/li>\n\n\n\n
  2. Spiral Freezer (Stainless Steel Belt)<\/li>\n<\/ol>\n\n\n\n

    In addition to the freezing equipment, Square also supplied the complete refrigeration package using Bitzer compressor units.<\/p>\n\n\n\n

    Process Flow<\/strong><\/strong><\/p>\n\n\n\n

    Steamer (by others)
    \u2192 Ambient Spiral Cooler (80\u00b0C \u2192 40\u00b0C)
    \u2192 Spiral Freezer (40\u00b0C \u2192 Core temperature -18\u00b0C)<\/p>\n\n\n\n

    Stage 1: Ambient Spiral Cooling<\/strong><\/strong><\/p>\n\n\n\n

    Freshly steamed dumplings at approximately 80\u00b0C enter the first spiral system equipped with a plastic modular belt<\/strong>.<\/p>\n\n\n\n

    The purpose of this stage is to naturally cool the dumplings down to approximately 40\u00b0C<\/strong> before entering the freezer.<\/p>\n\n\n\n

    Why Plastic Belt Was Used in the Ambient Cooler<\/strong><\/strong><\/p>\n\n\n\n

    Two important engineering considerations determined the belt selection:<\/p>\n\n\n\n

    1\ufe0f Prevention of Black Wear Debris<\/strong><\/strong><\/p>\n\n\n\n

    Under ambient temperature conditions, friction between:<\/p>\n\n\n\n

      \n
    • Correia de a\u00e7o inoxid\u00e1vel<\/li>\n\n\n\n
    • Polymer guide rails<\/li>\n<\/ul>\n\n\n\n

      can generate black wear particles. These particles may contaminate food products.<\/p>\n\n\n\n

      Plastic modular belts significantly reduce friction-related debris generation in room-temperature environments.<\/p>\n\n\n\n

      2\ufe0f<\/strong> <\/strong>Protection of Product Surface<\/strong><\/strong><\/p>\n\n\n\n

      At high temperatures (~80\u00b0C), dumplings are soft and delicate.<\/p>\n\n\n\n

      When placed directly on stainless steel mesh belts, the uneven mesh structure may leave imprint marks on the dumpling surface.<\/p>\n\n\n\n

      Plastic modular belts provide:<\/p>\n\n\n\n

        \n
      • A flatter contact surface<\/li>\n\n\n\n
      • More uniform support<\/li>\n\n\n\n
      • Reduced risk of surface marking<\/li>\n<\/ul>\n\n\n\n

        This ensures excellent product appearance and premium quality.<\/p>\n\n\n\n

        Stage 2: Spiral Freezing<\/strong><\/strong><\/p>\n\n\n\n

        After cooling to approximately 40\u00b0C, the dumplings enter the spiral freezer.<\/p>\n\n\n\n

        For the freezing stage, Square selected a standard stainless steel belt<\/strong>.<\/p>\n\n\n\n

        Why Stainless Steel Belt Is Suitable in Freezing Conditions<\/strong><\/strong><\/p>\n\n\n\n

        1.Reduced Friction in Low Temperature<\/p>\n\n\n\n

        In freezing environments, friction between the stainless steel belt and polymer guide rails is significantly lower.
        No black debris is generated under low-temperature operation.<\/p>\n\n\n\n

        2.No Surface Imprint Risk<\/p>\n\n\n\n

        Since the dumplings are already cooled to around 40\u00b0C before entering the freezer, their structure is firmer and more stable.<\/p>\n\n\n\n

        Even when using a stainless steel belt, no imprint marks occur.<\/p>\n\n\n\n

        Freezing Performance<\/strong><\/strong><\/p>\n\n\n\n

        The spiral freezer successfully reduces the dumpling core temperature to:<\/p>\n\n\n\n

        -18\u00b0C<\/strong><\/p>\n\n\n\n

        Final product results:<\/p>\n\n\n\n

          \n
        • Excellent shape retention<\/li>\n\n\n\n
        • Smooth surface<\/li>\n\n\n\n
        • No belt marks<\/li>\n\n\n\n
        • No contamination<\/li>\n\n\n\n
        • Uniform freezing<\/li>\n\n\n\n
        • Stable product quality<\/li>\n<\/ul>\n\n\n\n

          Refrigeration System Design<\/strong><\/strong><\/p>\n\n\n\n

          Square Technology also supplied the refrigeration package using Bitzer compressor units<\/strong>.<\/p>\n\n\n\n

          Special Climate Consideration \u2013 Chicago Winter<\/strong><\/strong><\/p>\n\n\n\n

          Due to the cold winter climate in Chicago, special attention was given to the evaporative condenser system<\/strong>.<\/p>\n\n\n\n

          To ensure stable operation during low ambient winter temperatures:<\/p>\n\n\n\n

            \n
          • An additional heater set was installed in the evaporative condenser<\/li>\n<\/ul>\n\n\n\n

            This enhancement prevents freezing risks and ensures reliable winter operation.<\/p>\n\n\n\n

            Project Outcome<\/strong><\/strong><\/p>\n\n\n\n

            The entire system has been operating reliably and efficiently.<\/p>\n\n\n\n

            The customer reports:<\/p>\n\n\n\n

              \n
            • Stable production performance<\/li>\n\n\n\n
            • Excellent product quality<\/li>\n\n\n\n
            • Reliable winter operation<\/li>\n\n\n\n
            • High satisfaction with overall system design<\/li>\n<\/ul>\n\n\n\n

              Key Project Highlights<\/strong><\/strong><\/p>\n\n\n\n

              Two-stage thermal control strategy
              Different belt materials optimized by temperature zone
              Product surface protection engineering
              Contamination risk prevention
              Climate-adapted refrigeration design
              Core temperature achieved: -18\u00b0C<\/p>\n\n\n

              \n
              \"1\"<\/figure>\n<\/div>\n\n
              \n
              \"2\"<\/figure>\n<\/div>\n\n
              \n
              \"3\"<\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"

              Client Location: ChicagoEquipment Supplier: Square Technology Group Co., Ltd. IQF: Ambient spiral cooler& spiral freezerRefrigeration System: Bitzer Compressor Unit& Evaporative condenser Project Overview Square Technology Group supplied a customized spiral cooling and freezing system for a dumpling processing facility in Chicago. The upstream steaming machine was provided by another supplier. After steaming, dumplings exit the cooker at approximately 80\u00b0C and must undergo staged cooling […]<\/p>\n","protected":false},"featured_media":5917,"parent":0,"template":"","news-case":[91],"product-category":[],"class_list":["post-5911","case-study","type-case-study","status-publish","has-post-thumbnail","hentry","news-case-spiral-freezer"],"acf":[],"_links":{"self":[{"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/case-study\/5911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/case-study"}],"about":[{"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/types\/case-study"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/media\/5917"}],"wp:attachment":[{"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/media?parent=5911"}],"wp:term":[{"taxonomy":"news-case","embeddable":true,"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/news-case?post=5911"},{"taxonomy":"product-category","embeddable":true,"href":"https:\/\/en.ntsquare.com\/pt\/wp-json\/wp\/v2\/product-category?post=5911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}