The smoother and flatter this surface, the smoother the bottom surface of the emulsion. It smoothens the lower (and upper) surface of the cloth where the emulsion or film will be bonded.More uniform wire thickness due to wire alone will be more consistent from screen to screen. It improves the overall thickness uniformity of the cloth, both within a given lot and from lot to lot.Advantages of Calendered MeshĬalendered Mesh is the high grade Swiss stainless steel wire cloth which had gone through a secondary rolling process which flattens out the knuckles of the wires. The fast photographic speed and improved reclaimability of capillary films, as well as their wider tolerance to exposure times and UV intensities, leads to screens which are more “user-friendly” an especially important feature where presensitised screens are used. Over the life of a screen, these features provide for more flexible, crack resistant films which will resist ‘drying out’ after repeated cleaning. This is especially the case in “backed” versions. The unique film chemistry of capillary films yields both superb solvent resistance and mechanical abrasion resistance. A result of these characteristics is that a 0.15mm line feature on a photopositive will produce a 0.15mm feature in the exposed screen, even at emulsion thickens of 25 microns or more. The extremely smooth, flat surface of the films enables the closest reproduction of the positive and much improved print definition. Shorter exposure times and high U.V absorbency of the films results in less undercutting during exposure and after wash out. The reproducibility and uniformity of emulsion thickness in capillary film screens result in a much more consistent ink deposit, even over large print areas. The availability of films in a range of standard thicknesses along with the ability to fine-tune final thickness through the use of backing emulsions, provides a capability for virtually any discrete thickness between 3 microns and 60 microns (depending on mesh size), without resorting to lamination. Advantages of Capillary FilmsĬapillary films are supplied as dense, pinhole free photopolymer emulsion on a temporary mylar backing as received thickness uniformity of the photopolymer is excellent. As a supplement to our standard direct emulsion technology, which remains the coating of choice for most applications, these films keep MCI at the forefront of screen technology. These films exhibit improved performance in several key areas relative to the standard direct emulsion technology.Īdditionally, when used in conjunction with thin, calendered wire mesh screens, they provide an improved capability for fine line printing. Recent advances in the chemistry of Indirect Films now make it possible for MCI to supply capillary films in both backed (Direct/Indirect) and un-backed formats.
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