摘要:
A system for keeping the surface (4) of a rotating cylindrical printing plate (6) of a printing press at a moderate temperature. A cooling air blower girder (2) extends longitudinally over the printing plate surface (4) and blows cold air onto the printing plate surface (4), in order to keep its temperature at a desired value. The blast-air girder (2) contains at least one heat exchanger (52) and at least one blower (60) as well as at least one air-return duct (20, 22), which together forms a cooling air cycle, through which the air, blown onto the printing plate surface (4), is returned to the air inlet of the heat exchanger and, optionally mixed with fresh air, blown by the blower (60) once again through the heat exchanger (52) onto the printing plate surface (4). The blast-air girder (2) represents an energy-saving, compact structural unit for keeping the printing plate surface (4) at a moderate temperature.
摘要:
In order to create a thermal regulator for a printing form (2) for anaqueous offset printing, a blast box (3) is provided for the blowing of the printing form (2) with tempered air, in which fans (4) and a cooler (5) are mounted, which is supplied from outside with a coolant (7) from a cooling installation (6), the cooling of the cooler (5) being regulated in dependence on a temperature of a regulator (8).
摘要:
Pressure cylinder for a printing machine equipped with air-conditioning and oil lubrication, the receiving shaft of a flexible cylinder casing being made hollow and at its respective ends having an inflow and an outflow for a cooling fluid, the receiving shaft passing furthermore through a chamber which forms an oil reservoir, the reservoir receiving the flexible cylinder casing rotatably, with ball bearings interposed, and this reservoir possessing on its underside orifices for the discharge of the oil and on its topside feed orifices cooperating with plates which extend radially into the immediate vicinity of the inner circumference of the flexible cylinder casing.
摘要:
A thermoregulator of a block cylinder used for an offset press which prevents the surface temperature of a block from rising, and at the same time allows it to maintain the said temperature at the most suitable point for printing.
摘要:
A process for the offset printing of stock material in which the blanket is inked repeatedly with the printing ink so that an image having an elevated ink layer thickness is produced on the blanket. Before the transfer of the image to the stock any moisture (water) on the blanket is removed, whereafter a non-hygroscopic stock is printed in a single printing step. Consequently, a high color saturation after a single printing is produced even when transparent or opal foil is used for illuminated advertising.
摘要:
An anvil cylinder for use in a processing machine, which is installed in parallel with a cylinder equipped with a processing tool such as a die cutting tool. The anvil cylinder comprises a heating means by which the cylinder is so heated as to make dry the ink transferred thereonto from a sheet to be processed thereby.
摘要:
A short inking unit for an offset rotary printing machine utilizes a heated ink transport cylinder having a particular surface with varying degrees of hydrophilicity, and an array of air blowing nozzles which cooperate to reduce or virtually eliminate contamination of the offset printing ink supply source with dampening fluid. Printing quality is improved since ink viscosity does not change and dampening fluid useage is kept at a minimum.
摘要:
A cylinder for handling continuous lengths of web material comprises a rotatably mounted tubular casing, a spindle extending from end to end of the casing and arranged to be stationary in relation to rotation of said casing and having an external diameter less than the diameter of an inner face of the tubular casing, at least one support bearing which is symmetrical in relation to the middle of the cylinder and coaxial to the cylinder, the bearing bridging over an annular space existing between the casing and the spindle, oil at least partly filling the annular space, at least one heat exchanger placed in the annular space and surrounding the spindle, mounts fixed to the spindle for locating the heat exchanger thereon, and connection ducts for coolant, at least partly in the form of lengths of flexible hose placed in recesses in the spindle, the connection ducts being adapted to join the heat exchanger with an external coolant supply and return duct.
摘要:
Selective reduction in ink tackiness resulting in better ink transfer with less print through better image reproduction fidelity, less plate wear, less waste of paper, and less linting may be accomplished by selective warming of the image areas on the printing plates prior to application.