Extrusion Coating Machine

Extrusion Coating Machine

The extrusion coating process is one of the first continuous processes to combine in situ, an extruded thermoplastic to a flexible substrate.pe extrusion coating machine Its versatility has enabled it to be applied to a wide variety of end uses including liquid packaging cartons, mill and industrial wrapping, sack lining, building, envelopes and medical/hygiene materials. It is also one of the most sophisticated plastic converting processes capable of producing a complex multi-layer structure with high performance properties.

Initially, it was developed to replace paraffin wax coatings on paper products but its flexibility allows a wide range of other applications such as food, photographic and mill/industrial wrapping.pe extrusion coating machine The process is based on the application of a thin, continuous film of very hot molten polymer to a paper or a polyethylene (PE) substrate. The paper is usually preheated or dried on a steam heated roll to improve adhesion and the film is then coated using an extrusion die with the polymer melt being drawn onto the substrate at a controlled nip pressure.

A wide range of coating and substrate thicknesses can be produced, ranging from a thin layer of polymer to a full blown composite.pe extrusion coating machine The application of the coating and the choice of the substrate will determine the final product’s properties such as strength, ductility, water resistance, heat sealing and organoleptic performance. The application of the coextrusion process enables a wide variety of structures to be produced with a number of different polymers and copolymers.

The key to the successful operation of an extrusion coating line is the precise control of the nip pressure load and temperature, with the optimum combination being found between melt flow rate during extrusion, temperature, and the surface energy of both the substrate and the film.pe extrusion coating machine A good understanding of these variables will allow the designer to achieve a very high level of performance with a minimum amount of equipment and manpower.

Generally speaking, extrusion coating is best used with low viscosity polyolefins such as LDPE, HDPE and PP.pe extrusion coating machine Coextrusion with other polymers is possible, but the process will require careful design of both feedblock and dual manifold dies to avoid interlayer instabilities. Computer modeling can be very useful in predicting the melting behaviour of these complex polymers and their interaction with the substrate. It can also be used to predict shear stress and melt flow rates between layers in a coextruded product and to estimate cooling efficiency. This knowledge is vital for new product development and troubleshooting problems in existing lines. This comprehensive book provides insight and clarity on the whole extrusion coating process by combining experimental data with computer modeling and the author’s 30 years of experience in the field. This unique approach makes it a valuable resource for the reader who is seeking innovation. Detailed descriptions of the extrusion coating process are presented along with the opportunity to evaluate and compare a wide range of polymers, copolymers, and substrates. The practical implications of this knowledge are then discussed in detail.

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