摘要:
Lithographic plate compositions and a method for their production have been discovered that are especially useful in conjunction with digitally controlled lasers to directly construct printable images on lithographic plates. The plates comprise a substrate and an ablatable polymeric coating on the substrate where the ablatable, imageable coating is prepared by in situ or solution polymerization of conjugated monomers deposited on the plate by vapor deposition or in solution. Examples of such monomers are thiophene, pyrrole and aniline.
摘要:
A lithographic printing surface is prepared using a thermal lithographic printing plate which requires no chemical development to remove areas of the imaged plate. The processless thermal lithographic printing plate has a sheet substrate; a hydrophilic layer on the sheet substrate; and a thermally sensitive imaging layer on the hydrophilic layer. The hydrophilic layer contains about 30 weight % of an aluminosilicate or clay, and preferably has an exterior surface which is micro-porous. The imaging layer preferably is micro-porous. The imaging layer is exposed imagewise using infrared laser radiation to produce an imaged layer. The imaged layer is treated with a conditioner liquid to produce a lithographic printing surface. By this method, the printing plate can be digitally imaged by infrared laser radiation so that the exposed areas become ink receptive and the non-exposed areas repel ink after simple treatment with a conditioner such as an aqueous surfactant solution such as a fountain solution containing an amphoteric surfactant.
摘要:
A method for directly imaging a lithographic printing surface using infrared radiation without the requirement of pre- or post-UV-light exposure, or heat treatment employs a printing plate which contains a support with a hydrophilic surface overcoated with an imaging layer. The imaging layer contains at least one polymer having bonded pendent groups which are hydroxy, carboxylic acid, tert-butyl-oxycarbonyl, sulfonamide, amide, nitrile, urea, or combinations thereof; as well as an infrared absorbing compound. The imaging layer may contain a second polymer which has bonded pendent groups which are 1,2-napthoquinone diazide, hydroxy, carboxylic acid, sulfonamide, hydroxymethyl amide, alkoxymethyl amide, nitrile, maleimide, urea, or combinations thereof. The imaging layer may also contain a visible absorption dye, a solubility inhibiting agent, or both. In practice, the imaging layer is imagewise exposed to infrared radiation to produce exposed image areas in the imaged layer which have transient solubility in aqueous alkaline developing solution, so that solubility is gradually lost over a period of time until the imaged areas become as insoluble as non-imaged areas. Within a short time period of the imaging exposure, the imaged layer is developed with an aqueous alkaline developing solution to form the lithographic printing surface. In this method, the infrared radiation preferably is laser radiation which is digitally controlled.
摘要:
Lithographic printing plates for wet or waterless offset printing are disclosed which can be imagewise exposed using a digitally controlled IR laser. The invention comprises a laser imagable lithographic printing plate comprising a substrate, a photosensitive coating on the substrate, and a water soluble laser ablatable top coating containing dyes or polymers that absorb infra-red, ultraviolet and visible light. Laminated transparent polymer films and/or peelable polymeric coatings films can be interposed between the coated substrate and a water soluble and/or organic solvent soluble laser ablatable top layer to augment plate production or image inscription on the plate.
摘要:
Radiation-sensitive compositions, printing plates containing such compositions, imageable by infrared and ultraviolet/visible radiation and imaging method using same. The compositions comprise a thermal-activated acid generator; a crosslinking resin; a binder resin comprising a polymer containing reactive pendant groups selected from hydroxy, carboxylic acid, sulfonamide, and alkoxymethylamides; an infrared absorber; and optionally a UV/visible radiation-activated acid generator for UV/visible sensitization.
摘要:
There is provided a lithographic printing plate substrate comprising (a) a base layer, (b) a layer of a first adhesive covering one side of the base layer except for at least two opposite edges thereof, and (c) an aluminum layer laminated onto the layer of first adhesive and said opposite edges of the base layer, the aluminum layer thereby being sealed with the base layer at said opposite edges of the base layer. There is also provided a method of manufacture thereof as well as a method of processing in view of recycling. Finally, there is provided a lithographic printing plate comprising the above substrate.
摘要:
A dry adhesive comprising a micro-featured and nano-featured surface, and a compliant surface having a hardness of about 60 Shore A or less, the micro-featured and nano-featured surface and the compliant surface being capable of forming upon contact a dry adhesive bond with each other.
摘要:
There is provided a lithographic printing plate substrate comprising (a) a base layer, (b) a layer of a first adhesive covering one side of the base layer except for at least two opposite edges thereof, and (c) an aluminum layer laminated onto the layer of first adhesive and said opposite edges of the base layer, the aluminum layer thereby being sealed with the base layer at said opposite edges of the base layer. There is also provided a method of manufacture thereof as well as a method of processing in view of recycling. Finally, there is provided a lithographic printing plate comprising the above substrate.
摘要:
A method, apparatus and system for analysing and authenticating a luminescent tag are provided wherein a luminescence is triggered in the tag and relative light intensities emitted thereby measured within at least two luminescence bands. The measured intensities are compared with at least one reference tag representative of relative intensities emitted by an authentic tag to determine whether the luminescent tag corresponds with any of the at least one reference tag. If the measured intensities match the representative intensities, the luminescent tag is authenticated. A computer program to be implemented by the apparatus and system is also disclosed. Further, a method and system for verifying the authenticity of one or plural objects are disclosed, wherein each of the objects is to be associated with a respective tag. The respective tags are coded to emit light, when triggered, within at least two luminescence bands at respective predetermined relative light intensities. Having access to a reference tag representative of the predetermined intensities, the authenticity of a luminescent tag is verified by measuring intensities emitted thereby within the luminescence bands and comparing the measured intensities with the predetermined intensities.
摘要:
The invention provides a near infrared absorption polymer comprising at least two different pendent infra-red chromophoric moieties covalently bonded to the backbone of an alkali-soluble resin, at least one of which is an indole cyanine dye and the other of which is a benz[e]-indole cyanine dye. When used in the coating of a heat sensitive positive working lithographic printing plate precursor the stabilization time needed after manufacture is significantly reduced, avoiding further conditioning processes before use. The precursors are preferably imagewise exposed with a near-infrared laser emitting at between 780 nm and 850 nm.