Valmet Paper Machinery Inc.

Nokia Corporation

Ari Lassila

Juhani Niskanen

Harri Kuosa

Kari Sipi

Juha Honkala

Wilhelm Landin

Timo Hirvonen

Seppo Pukkinen

Jyrki Stenvall

Harri Suhonen

Hannu Maa

Pentti Hyytinen

The present invention relates to a method and a virtual private network (VPN) gateway serverproviding rules for wireless access over a secure tunnel connection to a corporate network. The corporate networkis protected by firewall functionality, with different access configurations for different remote users. The VPN gateway serverincludes a user databasewhich provides rules specific for each user for the access to the corporate networkusing the secure tunnel. The rules include specific sets of TCP ports associated with respective specific users. The gateway serverlimits an authenticated user's access to the corporate network, which access is performed by means of the tunnel connection provided by the gateway server, to the associated allowed TCP server ports.

Personal remote firewall

An on-machine calender device intended to be on-line connected to a paper machine. The calender comprises a number of subsequent calendering nips, through which the web (W) to be calendered can be passed. The nips are formed between a soft calender roll and a hard calender roll or between two soft calender rolls. The calender is composed of one or several, for example two, subsequent calender modules (M.sub.1, M.sub.2). The modules comprise one counter-roll (10, 20) and at least two soft calendering rolls (11, 12, 13; 21, 22, 23), which are placed at both sides of the counter-roll (10, 20) in the direction of running of the web (W). The calender rolls (10, 11, 12, 13;20, 21, 22, 23) are dispaceable in relation to each other so that the threading of the web (W) can be carried out as a straight run, for which purpose an open passage is opened through the calender.

Calender device for on-line connection to a paper machine

The invention concerns a calender, in particular a supercalender, on whose frame (1) a set of rolls (2) is mounted, which comprises an upper roll (3), a lower roll (4), and several intermediate rolls (5) placed between the upper roll and the lower roll. The rolls (3, 4, 5) are supported on the frame (1) by the intermediate structure of the base parts (34, 47, 54) being vertically displaceable along guides (7) provided in the frame. Of the base parts, at least the base parts (54) of the intermediate rolls can be positioned in the vertical direction by means of lifting spindles (6) provided in the frame (1) and by means of spindle nuts (56) provided on the spindle. The base parts (54) of the intermediate rolls are supported on the lifting spindles (6) being vertically displaceable by means of pressure-medium operated relief devices (57) arranged between the base parts (54) and the spindle nuts (56) to reduce the journal loads on the rolls (5). The bearing housings (51) of the intermediate rolls are attached to the base parts (54) being pivotable relative to an articulation shaft (53) parallel to the axes of the rolls (3, 4, 5) and supported on the base parts (54) by means of attenuation devices (10) to equalize the forces resulting from movements of the nips (N.sub.1, N.sub.2, N.sub.3, N.sub.4) between the rolls and to attenuate oscillations of the rolls (5).

Calender, in particular a supercalender with multiple relief devices

A supercalender comprises a stationary variable-crown upper roll (1), a floating variable-crown lower roll (2), several intermediate rolls (3,4) between the upper roll (1) and the lower roll (2), and a hydraulic control system. The upper roll (1) has a roll mantle (12) that is supported on the roll shaft (11) by hydrostatic loading elements (13) acting in the direction of compression and by end bearings at the ends of the roll mantle, which bearings prevent displacement of the mantle (12) ends in the radial direction relative to the shaft (11) of the upper roll. The lower roll (2) has a roll mantle (22) that is supported on the roll shaft (21) adjustably in the direction of compression by means of hydrostatic loading elements (23). Position detectors (23,31) are provided at the ends of the shaft of at least one roll. The control system is arranged to regulate the positions of the rolls (1 to 4) in the system of rolls and to balance the forces effective in the supercalender in response to measurement signals received from the position detectors (27,31) and from the hydrostatic loading elements (23) of at least the lower roll.

System of rolls in a supercalender

Growing community of inventors

Espoo, Finland

Ari Lassila