Printed film

A small quantity of flexible packaging material, usually oriented polypropylene, shrink polypropylene, or polyethylene, is used to overwrap paperboard cartons. The film is wrapped around the carton and sealed by heating. Products such as boxed chocolates, candies, and cookies are overwrapped, sometimes by a printed film. 

Injection-molded articles can be decorated by in-mold labeling or by post-mold decoration. In the former method, printed film is inserted into the mold cavity before injection. The plastic forms an intimate contact with the graphic material. Post-mold decoration includes hot stamping, dry offset printing, and decal printing. 

Additives are used to provide a specific property. For example, a wax provides mb resistance in the printed film or a surfactant reduces foam generation in the fountain. 

This term is used both to describe designs that are etched or engraved in the mold surface and the process of inserting a printed film into the mold, to be produced as an integral component of the finished product. Etched surfaces can be drawn both parallel and perpendicular to a parting line of molds or postforming in an extrusion line.. However, be alert with molds to the fact that parallel to the parting line additional draft is required. A wide selection of patterns is available and new ones can be readily created. 

Volatiles and monomers in insoluble polymers. Aroma volatiles from foodstuffs, fruits, spices, tobacco, etc. Residual solvents in pharmaceuticals and printed films. 

Fuji print films, 19 282 Fujix Pictrography, 19 290 Fujix Pictrography 1000, 19 317-318 Fulgides, photochromic materials, 6 599 Fulgimides, photochromic materials,... 

Osborne PC, Yamamoto K. 1998. Disposable, enzymatically modified printed film carbon electrodes for use in the high-performance liquid chromatographic-electrochemical detection of glucose or hydrogen peroxide from immobilized enzyme reactors. J Chrom B 707 3-8. 

To address this problem water-insoluble latex copolymers containing the covalently bounded dye /V-(2,4-dinitropheny I)-1,4-pheny lene-diamine have been prepared. When printed as ink jet ink, latex particulates formed a hydrophobic print film on the media surface, thereby entrapping and protecting the colorant within the film. The process for preparing these agents consisted of initially forming the Diels-Adler adduct with furan and maleimide followed by a transimidation with 3-amino-1-propanol. 

Zirconium propionate is a polymeric zirconium carboxylate its structure is illustrated in Fig. 10. Use of zirconium propionate markedly increases the adhesion of an ink applied to treated polypropylene film. Figure 11 compares zirconium propionate with titanium acetylacetonate, which is commonly regarded as the industry standard. The standard test method used in the ink industry is the so-called tape test . Sticky tape is placed on the printed film and pressure is applied by the operator s thumb. The tape is then pulled off, by hand, and the amount of ink removed is visually assessed. Although extremely crude, it can be, and is, used for control in the ink industry. 

Toner particles printed on a transparency (PET) film by a laser printer was used to fabricate a microfluidic device. It was then laminated with a blank transparency film to form a closed device [238,239]. The complete process is shown in Figure 2.25. The PET film is 100 pm thick and has optical transparency above 80% in the range 400-800 pm The toner layer is 6 pm deep. Approximately twice this depth can be obtained by laminating two printed films. Lamination... 

Fig 1 Scheme of the screen-printed process a typical thick-film screen consists of a finely woven mesh of stainless steel, nylon or polyester, mounted under tension on a metal frame, normally aluminium. The screen defines the pattern of the printed film and also determines the amount of paste which is deposited. The mesh is coated with a ultraviolet sensitive emulsion (usually a polyvinyl acetate or polyvinyl alcohol sensitized with a dichromate solution) onto which the circuit pattern can be formed photographically. The ink is placed at one side of the screen and a squeegee crosses the screen under pressure, thereby bringing it into contact with the substrate and also forcing the ink through the open areas of the mesh. The required circuit pattern is thus left on the substrate... 

The final sections of the chapter will first discuss how droplet behaviour on unstructured substrates can be controlled before looking at inkjet printed films and lines, and how to obtain uniform morphology in these features. Finally, a brief summary of the chapter as a whole is given. 

A survey of inkjet printed devices shown to date shows substantial roughness in the inkjet printed line, due to drops drying individually as the line is built. While functional devices are realizable, the resulting devices typically operate at high voltages due to the need for thick subsequent printed films. 

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