Patent EP0516601A1 successfully refreshed from Google Patents.
EP0516601A1
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Wire loading device in a paper machine
Assignee: Valmet Technologies Oy
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Filing: 1992-05-27
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Granted: —
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Expires: 2012-05-27
Abstract
Abstract Wire (40,50) loading device (10) in a paper machine, by whose means a mechanical load is applied to the wire (40,50) of the paper machine across its entire width. By means of this load a pressure pulse is applied to the fibre layer or web (W) placed on support of a wire or between wires (40,50). By means of the pressure pulse the dewatering of the web (W) is promoted, the formation of the web (W) is improved, and/or the transverse profiles of different properties of the web (W) are controlled, such as the transverse profiles of dewatering, filler distribution, formation, and/or retention. The loading device (10A;10B;10C;10D;10E) comprises a plate-shaped spring blade (11), whose side is arranged as substantially parallel to the run of the wire or wires (40;50) to drag against the inner face of the wire (40,50) loop to produce a pressure pulse. The spring blade (11) is attached, from outside its dragging area, to the frame part (12) of the loading device. A loading force that produces said pressure pulse and curves the spring blade (11) in the machine direction is produced by the intermediate of said frame part (12) and/or the loading devices (16,17,20).
Inventors
- 👤 Jyrki Jaakkola
- 👤 Michael Odell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:00
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/003; D21F1/00; D21F1/48
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
203 words
Wire (40,50) loading device (10) in a paper machine, by whose means a mechanical load is applied to the wire (40,50) of the paper machine, preferably across its entire width, by means of which load a pressure pulse is applied to the fibre layer or web (W) placed on support of a wire or between wires (40,50), by means of which pressure pulse the dewatering of the web (W) is promoted, the formation of the web (W) is improved, and/or the transverse profiles of different properties of the web (W) are controlled, such as the transverse profiles of dewatering, filler distribution, formation, and/or retention, characterized in that the loading device (10A;10B;10C;10D;10E) comprises a plate-shaped spring blade (11), whose side is arranged as substantially parallel to the run of the wire or wires (40;50) to drag against the inner face of the wire (40,50) loop to produce a pressure pulse and that said spring blade (11) is attached, from outside its dragging area, to the frame part (12) of the loading device, a loading force that produces said pressure pulse and curves the spring blade (11) in the machine direction being produced by the intermediate of said frame part (12) and/or loading devices (16,17,20).
Claim 2
Dependent Claim
58 words
Loading device as claimed in claim 1, characterized in that the ratio of the length L of the spring blade (11) in the machine direction to the thickness S of the flexible plate material of the spring blade (11) has been chosen in the range of L/S = 10... 1000, preferably in the range of L/S = 300...500.
Claim 3
Dependent Claim
57 words
Loading device as claimed in claim 1 or 2, characterized in that the loading device is arranged to operate "with the fur" in relation to the running direction of the wire (40;50) against which the spring blade (11) drags, so that the spring blade (11) is attached from the inlet side of the wire or wires (40,50).
Claim 4
Dependent Claim
85 words
Loading device as claimed in claim 1, 2 or 3, characterized in that the spring blade (11) is loaded by to its frame part (12), which extends across the entire transverse length of the spring blade (11), applying a loading force by means of a power unit (24) in a direction substantially perpendicular to the running plane of the wire or wires (40,50) to be affected and/or by rotating said frame part (12) by means of power units (25) around a horizontal transverse axis (26).
Claim 5
Dependent Claim
66 words
Loading device as claimed in any of the claims 1 to 4, characterized in that the distribution of the linear load of the dragging area of the spring blade (11) in the transverse direction is arranged adjustable and controllable by means of devices by whose means an adjustable force field is applied to the side of the spring blade (11) placed opposite to its dragging side.
Claim 6
Dependent Claim
60 words
Loading device as claimed in claim 5, characterized in that said device for regulation of the profile of linear load consists of a series (17 1-k ) of regulating spindles (17), the linear load in the dragging area of the spring blade (11) being regulated by means of actuator motors acting upon said series of spindles (Figs. 9 and 10).
Claim 7
Dependent Claim
73 words
Loading device as claimed in claim 5 or 6, characterized in that the device for regulation of the profile of the dragging area of the spring blade (11) is a hose-like member (20), which is divided into compartments (20₁...20 N ) in its longitudinal direction and in the transverse direction of the web (W), into which compartments adjustable pressures (P₁... P N ) of a pressure medium, such as air, can be passed.
Claim 8
Dependent Claim
56 words
Loading device as claimed in any of the claims 1 to 7, characterized in that the distribution of the dragging area of the spring blade (11) is controlled by regulating the distribution of the temperature of the spring blade (11) in the transverse direction, e. g., by means of electric heaters (18, 19a, 19b) (Fig. 12).
Claim 9
Dependent Claim
42 words
Loading device as claimed in any of the claims 1 to 8, characterized in that the dragging area of the spring blade (11) is provided with a wear-resistant wear piece and/or coating (11k), for example a ceramic piece or coating (Fig. 9).
Claim 10
Dependent Claim
138 words
Dewatering and wire loading device as claimed in any of the claims 1 to 9 and to be placed in a twin-wire zone, characterized in that the forming ribs (66A₁...66A n ) of the draining and wire loading device are placed alternatingly inside the wire loops (40,50) placed one opposite the other and that, as jointly operative with said forming ribs (66), inside the opposite wire loop (40/50), wire loading devices (10) are fitted, which comprise a plate-like sping blade (11), whose side is arranged as substantially parallel to the run of the wires (40,50) to drag along the inner face of the wire (40,50) loop in the area of the forming rib (66) placed inside the opposite wire loop and/or, in the direction of running of the wires (40,50), substantially immediately before the area of said rib.
Claim 11
Dependent Claim
75 words
Device as claimed in claim 10, characterized in that the forming ribs (66) and/or the wire loading devices (10) and/or their loading members (20) are arranged so that they can be set or regulated in view of regulation of the relative positions of the forming ribs (66) and the spring blade (11) of the loading device and/or in view of regulation of the loading force applied by the spring blade (11) to the wire (40,50).
Claim 12
Dependent Claim
71 words
Device as claimed in claim 10 or 11, characterized in that the device comprises two units (46,60) placed one opposite the other in a substantially straight-running twin-wire zone, each of which units has, in the direction of running of the wires (40,50), alternating forming ribs (66) and loading devices (10) that comprise a spring blade (11), said forming ribs and loading devices being placed substantially one opposite the other (Fig. 19).
Claim 13
Dependent Claim
44 words
Device as claimed in any of the claims 10 to 12, characterized in that the device comprises two units (60,46) placed one opposite the other and comprising frame parts (60a,46a), in whose connection said forming ribs (66) and loading devices (10) are attached alternatingly.
Claim 14
Dependent Claim
52 words
Device as claimed in any of the claims 10 to 13, characterized in that the forming ribs (66A) and the dragging area of the spring blade (11) of the wire loading device (10) are fitted on the inner faces of the opposite wire loops (40,50) as placed facing one another (Fig. 20A).
Claim 15
Dependent Claim
76 words
Device as claimed in any of the claims 10 to 14, characterized in that the dragging area of the spring blade (11) of the wire loading device (10) placed inside the opposite wire loops (40,50) is fitted, in the direction of running of the wires (40,50), substantially immediately before the front tip (69) of the dragging area of the wear piece (68) on the forming rib (66B) placed inside the opposite wire loop (50) (Fig. 20B).
Claim 16
Dependent Claim
91 words
Device as claimed in any of the claims 10 to 14, characterized in that the area placed after the dragging area of the spring blade (11) of the wire loading device (10) is arranged to form a wedge space (T) widening in the direction of running of the wires (40,50) and facing the dragging piece (67) of the forming rib (66C) placed inside the opposite wire loop (50), said wedge space (T) being fitted to remove water from the web (W) by means of its foil effect (arrow A₃) (Fig. 20C).
Claim 17
Dependent Claim
48 words
Device as claimed in any of the claims 10 to 16, characterized in that in the opposite loading and dewatering units (60,46), at least one, preferably the first, forming rib (66A₁) and loading device (10) are integrated as a unit that has a common frame (21a) (Fig. 19).
Claim 18
Dependent Claim
89 words
Use of a loading device as claimed in any of the claims 1 to 17 in a counter-unit (46) of a dewatering unit (60) operating by means of suction, on a curved sector (10A) of a web forming roll (55), at the side of the outer wire (10B) on a forming shoe placed in a twin-wire zone, in a twin-wire zone inside the opposite wire loops (40,50) placed facing one another or at a short distance from one another (10d,10e), and/or in the area of the forming gap (10i).
References Cited (Backward Citations)
US3629057A
Cited
EP0373133A2
Cited
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