An arrangement in the headbox of a paper or cardboard machine has a pulp suspension feed system distributing the suspension over the width of the headbox. At least one first flow resistance element, such as an aperture plate and/or tube system, is provided with flow apertures, from which headbox the pulp suspension is passed via at least one chamber, such as an equalizing chamber and/or the slice gap of a slice chamber, onto a forming wire or equivalent. The arrangement comprises at least one pu...

A headbox apparatus of a paper machine or equivalent has a body (11). Dilution water (arrow L.sub.2) is conducted through at least two rows of ducts (12a.sub.1, 12a.sub.2 . . . ) into each body mixing chambers (13a.sub.1, 13a.sub.2 . . . ). Each mixing chamber (13a.sub.1, 13a.sub.2 . . . ) is limited by vertical walls (T.sub.1), a bottom wall (T.sub.2) and a covering wall (T.sub.3), and a partition wall (16a.sub.1, 16a.sub.2 . . . ). The ducts (14a.sub.1.1, 14a.sub.1.2 . . . ) on the inlet side ...

A method of ensuring the flatness of a vane that is mounted in a headbox by means of a mounting arrangement including engagement dowels for cooperation with a downstream support wall of a transverse groove, said vane being affected during operation by shearing forces from the stock and by retaining forces from the mounting arrangement. In accordance with the invention outer engagement dowels are mounted at the side edges of the vane to cooperate during a specific period of time, as the only enga...

An integrated circuit employable with a power converter. In one embodiment, the integrated circuit includes a power switch of a power train of the power converter formed on a semiconductor substrate. The integrated circuit also includes a driver switch of a driver configured to provide a drive signal to the power switch and embodied in a transistor including a gate located over a channel region recessed into the semiconductor substrate. The transistor also includes a source/drain including a lig...

In a method of forming a layered fibrous web, the method includes the steps of leading at least two different fiber suspensions through a head box (10), separating the fiber suspensions from each other by a blade device (18, 180), supplying the fiber suspensions to a web forming device (24) and forming a water layer having a transversely uniform flow at an outlet at the end of the blade device (18, 180), such that the water layer constitutes an extension of the blade device and thereby prevents ...

A process for easily producing an optically active .beta.-amino alcohol useful as a pharmaceutical intermediate from an inexpensive, readily available starting material is provided. A readily available .alpha.-substituted ketone is reacted with an optically active amine to yield a diastereomer mixture of an optically active .alpha.-substituted aminoketone. One of the diastereomers is isolated optionally after the diastereomers are converted to salts with an acid. The optically active .alpha.-sub...

Novel substituted 4-(1-H-pyrrol-1-yl)imidazoles are disclosed as well as methods of preparing them, pharmaceutical compositions containing them, and methods of using them. Novel intermediates useful in the preparation of the compounds of the invention are also disclosed and synthetic methods for preparing the novel intermediates. The compounds are useful as antagonists of angiotensin II and thus are useful in the control of hypertension, hyperaldosteronism, congestive heart failure, glaucoma, va...

A turbulence insert of a headbox of a papermaking machine is provided that includes a bundle of channels for guiding the suspension of materials from a first region to a second region. The channel bundle is comprised inpart of edge channels that have no adjacent channel on at least one longitudinal side, and is also comprised in part of central channels that have at least one adjacent channel on each longitudinal side. Also, at least two adjacent edge channels are provided that are joined with e...

A method and apparatus for reducing turbulence in a pulp flow stream flowing through a paper making machine headbox includes providing lamellae disposed in a portion of the headbox. A lamella end portion is modified which provides for the flushing of a dead space formed in the wake of the lamella. The modified lamella end portion produces small flow channels which divide the pulp stream flowing past the lamella into a plurality of substreams and guides the substreams into the region of the dead ...

A headbox for a paper machine with a stock channel featuring an outlet gap. The stock channel is preceded by a turbulence generator in the form of a machinewide bundle of many turbulence pipes. The turbulence generator is composed of two or three machinewide layers of turbulence pipes. The turbulence pipes of adjacent layers differ primarily by different flow cross sections, preferably also by different axial spacings a, A.