Transfer coating

Adhesive Transfer Processes. Many polymers, whether dehberately or accidentally, are adhesives, so that much of the adhesive industry can be regarded as a part of the mbber and plastics industry. However, there are several important material-transfer appHcations involving polymer products that are so critically dependent on controlled adhesion that they merit specific mention in that category. They include hot stamping foils, release coatings for pressure-sensitive adhesive products, photocopier materials, transfer coatings, and transfer printing of textiles. 

The adhesive strip on the outside of sanitary napkins is conventionally applied by hot melt transfer coating in-line with the production of the napkin itself. The adhesive in this application performs a function in the product beyond just holding the parts together. Thus, the requirements are more numerous ... 

Involves transferring coating from a flexible foil to the part by pressure and heat. Impression is made by metal or silicone die. Process is dry. 

For the coating of continuous substrates, such as flooring, wall covering and tarpaulins, direct or transfer coating is used. The paste can be applied directly using knife on roller or belt, or indirectly via reverse roll coating. The substrate can be a carrier material which is removed later. This process permits multilayer... 

Details of this method for transfer coating or lamination of perm-selective skin on a porous support can be found in the literature [49,52]. First, the advantage of this method is that a definite predefined skin layer thickness can be achieved. Second, the problem of insufficient wetting of support by coating solution and incompatibflity of the support with solvent can be overcome. 

Coated and laminated textiles usually consist of a textile substrate, which will typically be a woven, knitted or nonwoven fabric, combined with a thin, flexible fdm composed of a natural or synthetic polymeric substance. A coated fabric is one in which the textile substrate has a polymer film applied directly to one or both surfaces as a viscous liquid in a solvent or water, the thickness of which is controlled by application via a blade or similar aperture. A transfer coated fabric is an intermediate product in which a thermoplastic film is first prepared on a release paper prior to thermally bonding to the textile substrate. A laminated fabric usually consists of one or more textile substrates that are combined with a pre-prepared polymer film or membrane by adhesives or heat and pressure (Hall, 2000). 

U35. [BFGoodrich/Spec. Polymers] Polyester-based aq. aliphatic urethane db-persion skincoat for transfer coating applies. 

Hot transfers are used to provide parts with a decorative pattern or lettering. They comprise a pre-printed transfer film, on which the design has been applied. A heated spatula or plate is used to transfer coating from the film to the plastic. Water-based adhesives are also used to adhere printed transfers to plastics. 

One method occasionally used evaluate the relationship of silicone release liners or other materials of very low surface energy to a pressure sensitive, is to bring a coated pressure sensitive into contact with the liner under pressure, to carry out an adhesion test. This is of little value, as the adhesive is unable to wet out and so come into intimate contact with the release liner. The adhesive must first be coated onto the liner, dried, or cooled in the case of a hot melt, and then a carrier laminated to it, as is standard practice for transfer coating. As low values of adhesion can be expected, the force required to bend the backing may dominate, and so a thin flexible backing should be used, to maintain a constant peel angle, 25 pm polyester being satisfactory. Then a standard 180° peel test can be carried out with the release liner secured to a test panel. 

Uses Bonding agent for nylon and polyester sewing thread, and for transfer coating... 

Monawet MM-80 Nonoxynol-9 diluent, charge transfer coatings... 

Pigmented polyurethane coatings No effect on colors. In solutions with coales-cents, produces good films for transfer coating fabric laminates employing urethane-be adhesive tie coats. 

Graetz = Gz thermal capacity of Fc lkD 10-10 Heat transfer coating... 

Spray coating Spread coating Strippable coating Transfer coating Urethane coatings Vacuum metalizing... 

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