Abstract:
A composite doctor blade to be installed in a blade holder (11) containing a throat (15) has a rear part (14) made of a composite material which has a profiling (16) which protrudes beyond the plane (18) defined by the doctor blade in order to retain the doctor blade in the blade holder (11). At a distance from the rear part (14), part (17) of the profiling (16) protrudes from the plane (18) to one side only. Moreover, the part (17) is higher than its width in the cross-sectional plane of the doctor blade.
Abstract:
A support beam for at least one long working unit, notably of a paper machine or coater, includes several bundled, long profile elements forming in their entirety the support beam.
Abstract:
An apparatus for spreading and depositing a viscous liquid or paste-like material on a substrate includes a housing removably insertable into a diamond- or square-shaped squeegee blade holder, the blade holder itself mounted to a squeegee head assembly of a screen or stencil printer. The squeegee head assembly is driven in a linear direction over and above the substrate, dragging the blade over the substrate and forcing deposition of the material onto the substrate. The housing includes a pair of oppositely-disposed locking clamps that attach to both ends of the housing. A shaft having a blade secured thereto is disposed through the channels of the clamps and within a groove of the housing, and the shaft is rotatable within the housing and the locking clamps so that the angle of attack between the blade and substrate can be selectively adjusted and, once the appropriate angle of application is selected, the blade is fixed in position by tightening the clamps against the shaft.
Abstract:
A squeegee device applies material to a web substrate, which is guided across or held in contact with an abutment. The support body of the sequeegee contains a magnetic device extending along its longitudinal direction that holds a squeegee element made of magnetizable material. The squeegee edge is held against the substrate by the force of a magnetic device in the support body of the squeegee and a magnetic device under the abutment. In an alternative embodiment, no magnetic device is located under the abutment. However the abutment is made of ferrous metal to attract the magnetic device, causing pressure between the substrate and squeegee.
Abstract:
The doctor device has a profile member pivotally mounted to a retaining member that is carried on a mount. Vertical movement of the mount causes angular displacement of the profile member thereby changing the material application area disposed adjacent and upstream of the doctor. The doctor is either a doctor blade or roll doctor. In the case of a roll doctor, a receptacle is formed in the profile member and the roll doctor is magnetically retained within the receptacle. During application of a material to an application surface with the roll doctor, the roll doctor is magnetically attracted to the application surface by a second magnetic device located beneath the application surface or work surface.
Abstract:
A dual blade fountain coater for simultaneously coating the opposite sides of a moving web of paper includes a pair of oppositely positioned, non-contacting fountains and a pair of oppositely positioned metering blade assemblies which are mounted for movement about a common transverse pivot axis, which pivot axis is substantially coincidental with the blade contacting region on the web. Each assembly is independently adjustable of the other for adjusting blade angle and each fountain is similarly independently adjustable for varying the coating contacting region and dwell time. Metering bars may be mounted on the blades.
Abstract:
Methods and apparatuses for applying coatings on a baggy web are provided. A Mayer rod and a back-up roll engage with each other to form a nip. The back-up roll has a deformable inner layer with a surface thereof covered by a deformable outer layer. The Mayer rod and the flexible web at a contacting area are impressed into the back-up roll with a machine-direction nip width W and a nip engagement depth D, which enables formation of a coating having a substantially uniform thickness.
Abstract:
A method and apparatus are described for controlling a coating head, which exerts a nip pressure to a fibrous web to be coated (102) while the fibrous web is supported by a backing roll (101). An output signal of a sensor (105) integrated within the backing roll (101) is read, thus producing a measured indication of the nip pressure. A number of actuator control values are derived at least partly from said measured indication of the nip pressure. Said actuator control values are delivered as commands to a number of respective actuators (803) that contribute to creating the nip pressure, to control an amount of a coating substance on the fibrous web (103) in the coating head.