• Hot Melt Roll Coater
• Hot Melt Roller Coater
• Slot Die Coater
• Hot Melt Coating Machines

Hot melt coating is the application of a layer to a substrate by pre-melting the desired material and then allowing or forcing the material to cool, solidifying the layer. The process is widely used in industry, particularly for pressure-sensitive adhesives on thin substrates- self-adhesive labels.

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4. A slot die can be used to apply coating directly to a supported or unsupported substrate, to a transfer roll or in a curtain configuration. Slot dies can be used when coating aqueous, solvent based and hot melt coatings and can apply coatings from a range of 1 micron thick (wet) up to 50 mils.

Introduction[edit]

Hot melt adhesive slot die coatings require special systems for the respective requirements. Universal Converting Equipment is able to offer a range of slot die coating systems developed by Universal Adhesive Systems, ITW Dynatec and other slot machine manufacturers. Ultracoat™ die positioners precisely position a slot die at the optimum angle and proximity to the roll. Ultracoat™ HM™ Hot Melt Coating Solution The Ultracoat™ HM™ hot melt coating solution offers superior accuracy, making possible raw material savings. Coating Tech Slot Dies has more than 90 technical articles available related to slot die coating technology including defect resolution, rheology, system information, process articles, and information for specific industries such as adhesives, battery, optical film, and more.

Coating is the application of a layer to a substrate. In general, in order for a thin uniform layer to be applied, the application must be done at low or moderate viscosities. In many cases this low viscosity is achieved by dissolving or dispersing the desired coating in a liquid such as water or a solvent, but this then necessitates the subsequent removal of the liquid by, for instance, a drying process. Hot-melt coating achieves this low to moderate viscosity by melting the desired material before applying it to the substrate. The substrate and coated layer are then cooled, generally by passing over a chilled roller. There is no liquid to remove, so the process is, in principle, much faster than water- or solvent-based equivalents.

Terminology & use[edit]

The process has been used so extensively for the application of adhesive layers by slot-die coating that the use of the term ‘hot melt’ often implies slot-die coating, but hot melt methods have also been used for other coating processes, such as metering rod or roller coating.

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Transfer coating[edit]

If the desired substrate is too temperature-sensitive to allow direct hot-melt coating, the product may be made by coating a transfer belt which is then brought into contact with the substrate after cooling: if the relative adhesion is correct then the coating will transfer to the new substrate from the transfer belt.

See also[edit]

Hot Melt Roll Coater

References[edit]

Hot Melt Roller Coater

• 1. Coating Equipment and Processes, GL Booth, Lockwood Publishing Co, 1970
• 2. Modern coating technology systems, F Shepherd, 1995, ISBN0902098187

Slot Die Coater

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Hot Melt Coating Machines