摘要:
To reduce adherence of particles to electrodes and improve the contrast of recording paper, particles of oversized pigments are including in a contrast lacquer or ink layer which have a diameter such that the oversized particles or grains extend out from the lacquer or contrast layer, that is, have a diameter which is greater than the thickness of the ink layer. Suitable particles are carbon black, and calcium carbonate, particularly if darkly colored, present in about 3%-by weight-of the wet content of the lacquer layer which, for example, is a layer of nitrocellulose with finely grained carbon black pigment therein, of a thickness in the order of 1 to 10 .mu.m; the additional oversized pigment granules will have a thickness in the order of about 2 to 20 .mu.m, preferably, on the average, about 5 .mu.m and embedded in lacquer layer of about 2 .mu.m thickness, over which a vapor deposited layer of aluminum of between 0.01 and 0.1 .mu.m is applied. A typical substrate is paper.
摘要:
A protective device is provided for the threaded shaft of a machine in which the shaft extends between relatively fixed and movable machine parts in respectively rotary and driving connections. The device comprises a belt which is fixed at one end to the shaft near the fixed machine part, wound round the shaft at the same pitch as the shaft thread, and passed to a rotary member mounted on the movable member. If the shaft is only exposed up to the machine movable part, the rotary member is spring-loaded or driven to serve as a take-up/supply spool. If the shaft continues beyond the movable part, the belt is wound around the remainder of the shaft and connected at its other end to the shaft.
摘要:
An apparatus for the laser processing of workpieces with shortened processing time. Two laser units that can be simultaneously operated are directed towards each other. Workpieces, for example printed circuit boards, are moved between the two laser units such that the two sides of the workpieces are simultaneously processed. As a result the processing time is considerably shortened.
摘要:
Oligomeric and high molecular mass products of reaction of alkyl and aryl allophanates with nucleophilic compounds, and also low molecular mass, oligomeric and high molecular mass compounds containing lateral and/or terminal allophanate groups, and also the use of the reaction products and/or of the compounds in coating compositions, adhesives and sealing compounds or for producing films.
摘要:
A guide for directing a print head in a printing device parallel to a platen, the guide being constructed of a unitary extrusion of a metallic material having two guide rails joined by a thin web of material. The structural arrangement of the guide offers a high resistance against bending so that a constant predetermined distance can be maintained between the print head and the platen.
摘要:
To prevent the formation of scratches, surface discontinuities, slide tracks or striations, for example due to sliding of electrodes (20) over the metal layer (12) of a metalized recording medium, a protective surface coating (13) of low-friction sliding protective material is applied in the form of discontinuous islands over the metal layer (12). The discontinuities permit electrical contact between the electrode (20) and the metal layer (12) although the protective surface coating (13) has insulating properties. The coating (13) may be polymerized hexamethyl-disiloxane, hexafluoropropylene, or Teflon, polymerized, preferably in a hot cathode glow discharge; or a metallic soap. The protective layer is hydrophobic in the form of islands of a thickness of between 10.sup.-9 m to 10.sup.-7 m, preferably about 1 to 2.times.10.sup.-8 m, thus protecting the underlying metal layer (12) against damage by the electrode (20), and attack by moisture or dampness from the ambient atmosphere. A surface portion can be rendered hydrophilic to permit writing on the recording paper by a felt pen, with aqueous ink or the like.
摘要:
The invention relates to a soluble, cross-linkable acrylate copolymer which is obtainable by copolymerization of more than 3 to 30% by weight of monomers having at least two polymerizable, olefinically unsaturated double bonds, from 5 to 50% by weight of monomers having a cross-linkable group, with the exception of hydroxyl groups and carboxyl groups, and from 20 to 92% by weight of further monomers having a polymerizable, olefinically unsaturated double bond, the sum of the monomers being 100% by weight. The invention furthermore relates to processes for the preparation of acrylate copolymers and coating agents based on the acrylate copolymers according to the invention.
摘要:
A platen assembly, including a cylindrical platen, for advancing a web of record material through a printing device, the record material having perforations along its borders for receiving pins disposed in pin sprocket wheel assemblies mounted on opposite ends of the platen.
摘要:
To permit color reproduction of signals representing a color image by burning off a metalized layer (2) on an insulating substrate (1, 3), by contacting the metalized layer with an electrode (35) and passing a current pulse through the electrode, the color pattern is placed beneath the metalized layer and comprises groups (17) of colored dots which are essentially hexagonal in shape and positioned closely adjacent each other to form a color dot pattern of beehive appearance. One of the color dot pattern preferably additionally has a characteristic other than color to distinguish it from the others and provide a locating marker; the additional characteristic may, for example, be magnetic particles on the dots to be sensed by an electromagnetic transducer, similar to a tape recorder head, or a difference in reflectivity which can be sensed by an optical transducer.
摘要:
In a hydro-jet housing the form block, possibly with core, is stripped of mold sand by means of a high-pressure water jet. The sand is fed in the form of a muddy pulp to a first hydrocyclone, where the water is largely separated and is supplied for the formation of new muddy pulp. The sand flows into a scrubbing mechanism for knocking off its binding material, which has settled as a coat around the sand grains. After being scrubbed, the sand is fed to a second hydrocyclone for hydro-extracting water and dislodged binding material from the sand. The sand is then dried and cooled and is available for further use. The contaminated water is neutralized with flue gas, after which a flocculation agent is added to it and the water is then purified for reuse in a settling tank and possibly in a filter.