September 20 2016
The Paper Structure of Sublimation Paper (1)
The paper substrate of the sublimation paper can be selected so that it has properties that are desirable forsublimation transfer paper. In general, dye sublimation paper should be sufficiently processable When processed through a printer for application of the sublimable ink thereto. In addition, the sublimation transfer paper should be sufficiently processable so that it can be combined With the sublimation print substrate and subjected to sublimation printing. If the paper substrate is too flimsy or too rigid, it may be difficult to handle for printing.
The openness of the paper substrate can be selected to facilitate drying of the sublimable ink and to resist penetration of sublimed dye vapor to encourage the sublimed dye vapor to move toward the printing substrate that receives the final image rather than in a direction away from the printing substrate such as into the paper substrate. Accordingly, it is desirable to provide a sufficient openness so that the carrier penetrates into the paper substrate While the sublimable dye remains at or on the sublimable ink receptive coating. Furthermore, the openness should be sufficiently low so that sublimed dye resists movement into the paper substrate and is instead encourage to move toward the printing substrate to generate the final image.
The paper substrate can be prepared from natural fiber, synthetic fibers , or a mixture of natural fiber and synthetic fiber. Natural fiber refers to fibers formed from plants or animals. Natural fibers are not fibers that are formed as a result of extrusion or spinning. The natural fibers can be obtained from a source of fibers using techniques such as chemical pulping, chemical mechanical pulping, semi chemical pulping, or mechanical pulping. Natural fibers from plants are often referred to as cellulosic fibers . Exemplary natural fibers that can be used to form the base sheet include Wood fibers and non-Wood natural fibers such as vegetable fibers , cotton, various straWs (e.g., Wheat and rye), various canes (e.g., bagasse and kenaf), silk, animal fibers , (e.g., Wool), grasses (e.g., bamboo, etc.), hemp, com stalks, abaca, eucalyptus, etc. Examples of synthetic fibers that could be used for the base sheet include polyacrylic fibers , polyethylene fibers ,polypropylene fibers , polylactide fibers , rayon, and nylon fibers.
Wood fiber can be obtained from Wood pulp, Which can include hardwood fiber, softwood fiber, or a blend of hardwood fiber and softwood fiber. The pulp can be provided as cellulose fiber from chemical pulped Wood, and can include a blend from coniferous and deciduous trees. By Way of example, Wood fiber can be from northern hardwood, northern softwood, southern hardwood, southern softwood,or any blend thereof. Hardwood fibers tend to be more brittle but are generally more cost effective for use because the yield of pulp from hardwood is higher than the yield of pulp from softwood. Softwood fibers have desired paper making characteristics but are generally more expensive than hardwood fibers.
The natural fibers can be extracted With various pulping techniques. For, example, mechanical or high yield pulping can be used for stone ground Wood, pressurized ground Wood, refiner mechanical pulp, and thermome chani cal pulp. Chemical pulping can be used incorporating kraft,sulfite, and soda processing. Semi-chemical and chemi-mechanical pulping can also be used Which includes combinations of mechanical and chemical processes to produce chemi-thermomechanical pulp. Natural fibers can be bleached or unbleached.
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