Extrusion Lamination Coating Machine
Extrusion Lamination Coating Machine
An extrusion lamination coating machine is a modern solution to traditional dry compounding and hot melt adhesive blending, and it has been popular in Europe and America.extrusion lamination coating machine It is a highly automated and efficient manufacturing process, which can produce high-quality thermal film with low cost and environmental protection. It also saves labor, raw materials and time.
An important consideration in the design of an extrusion coating line is the shear and tensile stress that will be applied to the coating film as it travels through the nip. The shear and tensile stresses must be lower than the mechanical properties of the substrate to prevent plastic degradation, which can result in poor adhesion and film integrity. An extrusion coating line can be designed to meet these demands by incorporating a variety of features. For example, a non-contoured straight manifold die and deckles can reduce shear stresses. An adjustable-while-running deckle is another option, as it can be set to the desired profile and can be adjusted while the machine is running. An extrusion coating line can also incorporate a multimanifold die to produce coextruded films with multiple layers.
The nip of an extrusion coating line is designed to apply pressure to the molten thermoplastic resin as it exits the extruder. This pressure is aided by the use of a cooling roller, which maintains a temperature that is less than the melting point of the polymer. It is important to ensure that the nip pressure and cooling roller match the material specifications of the substrate to be coated.
The pressure and counter-pressure rolls are water cooled to prevent degradation of the substrates. During the extrusion lamination process, an auxiliary substrate is placed between the pressure and chill rolls to sandwich the melted polymer and bind it to the second substrate. The nip pressure is applied to the auxiliary substrate as the molten polymer passes through it, which creates the bond.
Extrusion lamination is an economical alternative to solvent based printing and coating when a white background is required in packaging graphics. The process produces a more durable and weatherable product, requires less drying time, and can significantly reduce opacity problems that are caused by pin-holing. Compared to applying a flood white coat at the printer, the extrusion coating process is also 5 to 10 percent more cost effective.
The main components of an extrusion lamination coating machine include the extruder, nip roller, and cooling roller. An additional component is the splicing unit, which consists of an unwind shaft, auto splicer, and adjustable brake. The splicing unit provides a gap and contact winding mode for reducing waste and ensuring uniformity of the final product. It also controls the gap and contact tension between the windings to avoid wrinkle and skewing during the high speed running of the production machine. An advanced electric meter and pneumatic clutch institution are integrated from the splicer to the extruder, laminating unit, and rewinder to increase automation and simplify operation.
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