Coater Finned Tube Heat Exchanger for Drying And Cooling Process

Coater Finned Tube Heat Exchanger for Drying And Cooling Process

Coater finned tube heat exchanger is the key equipment used in the coating production line to regulate the temperature of the drying or cooling process, through the finned tube to strengthen the heat transfer efficiency, precise control of the temperature of the coated substrate (e.g., film, paper, metal foil, etc.), to ensure that the coated layer (e.g., glue, coating, ink, etc.) rapid curing, drying or cooling of the final shape, to protect the quality of the product.

The core of coater finned tube heat exchanger is to use finned tube to strengthen heat transfer, through the heat exchange between heat-carrying medium (e.g. hot water, steam, heat-conducting oil or refrigerant) and air (or other gases), to realize the heating or cooling of coating substrate. The specific process is as follows:

Heat Medium Flow: The heat-carrying medium (e.g., steam) circulates inside the finned tube, releasing heat (heating scenario) or absorbing heat (cooling scenario).

Fin-enhanced heat transfer: The metal fins of the finned tube (attached to the surface of the base tube) increase the contact area with the air, and at the same time, through the high thermal conductivity of the fins, the heat of the medium inside the base tube is quickly transferred to the fin surface.

Air circulation heat exchange: The fan blows the air (or fresh air from outside) from the coating machine over the surface of the finned tube, and the air and the fins undergo heat exchange (heat-absorbing heating or exothermic cooling) to form an airflow with the appropriate temperature.

Substrate temperature control: The airflow after heat exchange acts directly on the surface of the coated substrate, and through convection heat exchange, the substrate is heated (to accelerate the drying and curing of the coating) or cooled (to prevent the coating from overheating and deformation), thus realizing precise temperature control.

The key processes of the coating machine (such as drying, shaping) is sensitive to temperature, the role of the finned tube heat exchanger is reflected in the following:

Drying: after coating the substrate (such as film on the glue layer) needs to be quickly dried, heat exchanger through the hot water or steam to heat the air, the formation of 80-150 ° C hot air (the specific temperature depending on the type of coating), blowing to the surface of the substrate, to accelerate the evaporation of solvents and the coating curing, and at the same time to avoid the localization of excessive heat At the same time to avoid localized overheating leading to deformation of the substrate or cracking of the coating.

Cooling: Some coating processes (e.g. high temperature curing coating) need to be quickly cooled and shaped, heat exchanger through the cold water or refrigerant cooling air, the substrate temperature down to room temperature, to prevent the coating from sticking or performance changes.

Temperature uniformity control: through the reasonable design of finned tube arrangement density, fan air volume distribution, to ensure that the air flow on the surface of the substrate temperature uniformity (temperature difference is usually controlled within ± 2 ℃), to avoid uneven coating thickness or quality defects due to the local temperature difference.