Extrusion Lamination Coating Machine
Extrusion Lamination Coating Machine
The extrusion lamination coating machine is one of the most important parts of a packaging line, and its operation can have a major impact on product quality.extrusion lamination coating machine Typically, the process involves an extruder forcing a layer of melted thermoplastic material between two substrates (typically paper or aluminium foil). Using this technology allows production of high-quality films for food, hygiene, construction and other products.
In addition to providing a seal and barrier against insects and moisture, the film also provides some structural rigidity to the finished product. The adhesive used may be hot melt or cold pressure-sensitive. Hot melt is the most common in most applications, but cold pressure-sensitive adhesives are sometimes used for higher performance applications.
As the extrusion coating is applied to the substrate web, the molten polymer solidifies, creating an adhesive bond between the two layers of material. The two sides are then pressed together by heated cylinders to form the laminate. This process can be a two-layer laminate, or it can consist of multiple layers (duplex and triplex lamination).
Typical extrusion coaters employ a single-manifold die with adjustable while-running deckles to enable precise control of the coating thickness. However, due to the high operating temperatures involved in the extrusion process, shear and tensile stress on the polymer is much greater than in a conventional injection mold. This stress changes shape as the polymer flows through the die, and shear stresses on the substrate can be significantly reduced by a deckle that is positioned close to the die gap.
A key aspect of the adhesive in an extrusion-coated structure is its ability to adhere to the substrate without causing deformation. This requires a relatively high "slip" value on the bonded surface, which in turn can be enhanced by adding organic'slip additives' to the molten polymer. The'slip' is also affected by the design of the chill roll that cools the coating as it solidifies.
Coating and Lamination Made Simple
The extrusion lamination coating machines offered by Lohia are designed for efficient and precise PP/LDPE & HDPE polymer coating & simultaneous coaxing of a woven or tubular pp or ldpe based fabric. These are economical in investment as well as running cost and simple to operate and maintain.
These are equipped with inner deckle system customized in-house to reduce trim and provide uniform high speed production. They have unique heater recycling design for optimum energy efficiency and cooling circuits that deliver accurate output control.
The machines are ideal for coating woven sacks, tarpaulins, jumbo bags, BOPP film etc., and are available in widths from 6 feet to 16 feet. They also have an excellent splice sysytem that ensures the proper and quick splicing of the woven or non-woven material. They use a splice roller for quick splicing and have the option of an auto-splice system. These machines are fully servo controlled and can be easily operated by trained operators. They are a perfect choice for manufacturing companies that demand high-quality splices and superior quality of the final product.