摘要:
The invention relates to a method for producing flexographic printing forms by engraving a printing relief on a flexographic printing element that can be laser engraved, said element having a photochemically cross-linked relief layer. The relief layer is transparent and comprises oxidic, siliceous or zeolitic solid matter with a particle size between 1 and 400 nm in a quantity of between 0.1 and 8 wt. % in relation to the quantity of all components in the relief layer.
摘要:
Laser-engravable flexographic printing elements for the production of flexographic printing plates have relief layers comprising blends of hydrophilic polymers and hydrophobic elastomers. Said flexographic printing elements are used for the production of flexographic printing plates by means of laser engraving.
摘要:
A laser-engravable flexographic printing element comprising an elastomeric, relief-forming, laser-engravable, thermally and/or photochemically crosslinkable layer comprising, as binder, at least 5% by weight of syndiotactic 1,2-polybutadiene having a content of 1,2-linked butadiene units of from 80 to 100%, a degree of crystallinity of from 5 to 30% and a mean molecular weight of from 20,000 to 300,000 g/mol on a flexible, dimensionally stable support.The elastomeric, relief-forming, laser-engravable layer preferably comprises: (a) from 50 to 99.9% by weight of one or more binders as component A consisting of (a1) from 5 to 100% by weight of syndiotactic 1,2-polybutadiene having a content of 1,2-linked butadiene units of from 80 to 100%, a degree of crystallinity of from 5 to 30% and a mean molecular weight of from 20,000 to 300,000 g/mol as component A1, and (a2) from 0 to 95% by weight of further binders as component A2, (b) from 0.1 to 30% by weight of crosslinking, oligomeric plasticizers which contain reactive groups in the main chain and/or reactive pendant and/or terminal groups as component B, (c) from 0 to 25% by weight of ethylenically unsaturated monomers as component C, (d) from 0 to 10% by weight of photoinitiators and/or thermally decomposable initiators as component D, (e) from 0 to 20% by weight of absorbers for laser radiation as component E, and (f) from 0 to 30% by weight of further conventional additives as component F.
摘要:
A method for the production of flexographic printing forms by means of laser engraving, wherein at least one elastomer relief layer is applied to a dimensionally-stable carrier. The relief layer comprises at least one elastomer binding agent and at least one absorber for laser radiation; the relief layer is entirely cross-linked by means of electron radiation at a minimum overall dose of 40 kGy; a printed relief is engraved into the cross-linked relief layer by means of a laser. The invention also relates to flexographic printing forms which can be obtained according to said method.
摘要:
A process for the production of flexographic printing plates by laser engraving, in which the recording layer of a crosslinkable, laser-engravable flexographic printing element is crosslinked by the combination of a full-area crosslinking step with a crosslinking step which only acts at the surface, and a printing relief is engraved into the crosslinked recording layer by means of a laser, and flexographic printing plates obtainable by the process.
摘要:
The invention relates to a method for printing a substrate (7) in a printing machine, in which ink is transferred from a flexible carrier (3) to the substrate (7) in accordance with a predefined pattern by energy being introduced into the ink through the flexible carrier (3) by a device for the introduction of energy, some of the ink evaporating in the area of action of the energy and, as a result, a drop of ink (67) being thrown onto the substrate (7) to be printed, this step being repeated at least once, ink being transferred at least partly to the substrate (7) at the same positions in order to intensify the pattern produced. The substrate is transported through the printing machine (1) during the printing and, after the transfer of ink in step (a), the device for the introduction of energy is controlled in such a way that, during the repetition in step (b), the ink is transferred at the same position again as in step (a). The invention further relates to a printing machine for implementing the method.
摘要:
The invention relates to a method for producing structured, electrically-conductive surfaces (3, 11) on an electrically nonconductive support (1), in which the structured and/or full-area electrically-conductive surfaces (3) of a first plane are applied onto the support (1) in a first step, an insulating layer (9) is applied in a second step at the positions where structured and/or full-area electrically-conductive surfaces (11) of a second plane cross the structured and/or full-area electrically-conductive surfaces (3) of the first plane and no electrical contact is intended to take place between the structured and/or full-area electrically-conductive surfaces of the first plane (3) and of the second plane (11), in a third step the structured and/or full-area electrically-conductive surfaces (11) of the second plane are applied according to the first step, and the second and third steps are optionally repeated.
摘要:
Hyperbranched polyurethanes are used for the preparation of printing inks and of printing varnishes. Printing inks and printing varnishes contain the hyperbranched polyurethanes as binders.
摘要:
The invention relates to a composition for producing magnetic or magnetizable moldings, comprising from 95.5 to 98.95% by weight of a powder made of a magnetic or magnetizable material, from 1.0 to 4% by weight of a mixture made of at least one epoxy-novolak resin, and also of at least one hardener, and comprising from 0.05 to 0.5% by weight of at least one additive, based in each case on the total weight of the composition. The mixture made of the at least one epoxy-novolak resin and of the at least one hardener comprises from 85 to 95% by weight of the epoxy-novolak resin and from 5 to 15% by weight of hardener. The hardener has been selected from (cyclo)aliphatic amines and their adducts, polyamides, Mannich bases, amidoamines, phenolic resins, imidazoles, and imidazole derivatives, dicyandiamide, and BF3-monoethanolamine. The invention further relates to a process for producing the composition, and also to a process for producing a molding made of the composition.
摘要:
Method for producing structured electrically conductive surfaces on a substrate, which comprises the following steps: a) structuring a base layer containing electrolessly and/or electrolytically coatable particles on the substrate by ablating the base layer according to a predetermined structure with a laser, b) activating the surface of the electrolessly and/or electrolytically coatable particles and c) applying an electrically conductive coating onto the structured base layer.