This invention relates to the use of terpene class, natural product and blended solvents in flexographic photopolymer printing plates. Again plate quality was equivalent to that obtained with perchloroethylene at a higher exposure time. No. It is further an object of this invention to present solvent systems which can be used with a wide variety of photopolymeric printing plates, and which present reduced safety problems. This invention provides solvents for use in the processing of photopolymer printing plates which can be used with a wide variety of photopolymeric materials. Our portfolio of flexographic printing plate solutions consists of photopolymer analog sheet, digital sheet, and liquid. USE OF BENZYL ALCOHOL AS A NON-SOLVENT. The following was added to a clean Flex-Light® 30"×40" plate processor and recirculated for 10 minutes: Photopolymer plates based on a block copolymer of styrene and isoprene were again processed as in Example 1 with this solvent. The film has a natural curl – work with the film curl side uppermost. DuPont introduced the first solid flexo photopolymer plate under the trade name Cyrel in 1974. Removal of the emulsified wash solvent from the plate by water-rinsing in the present invention prior to oven drying gives reduced swelling and improved plate quality over conventional wash solvents. When non-solvents are employed suitable reagents include n-butanol, 2-ethoxyethanol, benzyl alcohol, ethanol, 2-butoxyethanol, isopropyl alcohol, 2-(2-butoxyethoxy) ethanol, mineral oil, mineral spirits, ligroin, decane, octane, and other similar materials. 87 0 obj
Proven Plate Processing. Photopolymer printmaking involves the use of photosensitive plates that are exposed to sunlight and developed using water. This plate, called Tilon, was based on nylon chemistry. A film negative is placed over the plate surface, secured with Kreene or a glass covering, and exposed to ultraviolet light. The terpene-based solvents also, surprisingly, produce photopolymer plates with less cured polymer image swelling than those processed in conventional hydrocarbon or chlorinated hydrocarbon solvents. 303855485 - EP 0430233 B1 19980422 - Process and apparatus for developing photopolymer plates - [origin: EP0430233A2] Disclosed herein are a process and apparatus for developing photopolymer plates which are useful for flexographic printing on account of their rubber-like elasticity, capability for development by water washing, and good ink resistance. U.S. Pat. 2. Success of photopolymer plates revolutionized flexographic printing. The addition of the nonsolvent (n-butanol) produced a precipitation or flocculation of the dissolved photopolymer. Flexography India Press is a manufacturer of Flexography Photopolymer Plate making Equipment. 0,3mm thick (only a support), the photopolymer layer (appr. 3500810 8" x 10" discontinued 35001216 12" x 16" discontinued 35001620 16" x 20" discontinued Note: Plates may be cut to custom sizes using a photopolymer plate cutter. This composition has use as a flexographic printing plate and requires processing organic solvents including methyl ethyl ketone, benzene, toluene, xylene, trichloroethane, trichlorethylene, methyl chloroform, tetrachloroethylene, or solvent/non-solvent mixtures e.g. Expose to UV Ordinarily, this is accomplished by washing the exposed plate in a solvent which can remove the unpolymerized material while leaving the polymerized (cured) material intact. After about 1 minute the copper is exposed in the dark areas. The etched or relieved areas do not contact the ink. The PolyJet technology involves the use of liquid photopolymers in order to create a solid 3D object (Fig. Plates are here! USE OF BENZYL ALCOHOL AS A NON-SOLVENT. 67 liters of d-limonene (4-isopropenyl-1-methylcylohexene) Photopolymer plates based on a block terpolymer of butadiene, acrylonitrile and acrylic acid were processed as in Example 1 using this solvent. Photopolymer plates based on a terpolymer of butadiene, acrylonitrile, and acrylic acid were processed as in Example 1 with this solvent. Alibaba.com offers 1,464 photopolymer plate maker products. Because of this nontacky condition it was easy to remove the precipitated photopolymer from the solvent mixture. Wash time for this type of photopolymer was 20 minutes. (c) a non-solvent for said uncured photopolymer; and. It is a freestanding unit with wheels so can be manoeuvred. 28 liters 25% (by weight) aqueous potassium toluene sulfonate, 5 Kg OT-100 (dioctyl sodium sulfosuccinate). Apply a thin layer of photopolymer emulsion with a roller. 110 0 obj
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Main points Dermatitis is common in printing. This permits clear, sharp images to be formed at much lower exposure times than those used when conventional solvents are employed, since swelling tends to distort the image formed. Plate exposure times equivalent to those required for perchloroethylene-n-butanol washed plates were necessary to hold 0.004" lines and 3%, 150 line half tones with this wash solvent. Remove the protec ve cover sheet from photopolymer plates 3. This additional non-solvent, which can be the same as or different from the one in the blend, will promote spontaneous flocculation and separation of the uncured photopolymer from the blend. Achieve superb results that hitherto were only achievable in offset or gravure. These plates are .034" thick. These terpene-based solvents may be substituted for the synthetic hydrocarbon or halogenated hydrocarbon solvents presently used for processing photopolymer printing plates. Photopolymer. 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