FI117104B - Belt guide roller for use in e.g. coating device, has tubular casing part that is rotated along with end flanges, where electrical resistors are provided at outer surfaces of end flanges for heating end flanges - Google Patents

Abstract

The roller has end flanges (21), which are provided with a tubular casing part (23) rotating along with the end flanges, where electrical resistors (24) are provided at outer surfaces of the end flanges for heating the end flanges. A heat insulating layer is provided on the electrical resistors, and the roller is a roller that guides frames. The end flanges are supported at a standard construction of the roller.

Description

BACKGROUND OF THE INVENTION The present invention relates to a belt guide roller for a coated or uncoated fibrous web processing device such as paper or tissue paper. The belt guide roller is formed with end-flanges mounted on the frame structures, to which a tubular sheath section is connected for rotation with the end-flanges! The handling device consisted of 10 straps wrapped around a single belt guide roller having a belt; provided with at least one contact surface with the belt to form a web treatment area between the belt and the counter member, the web to be treated is introduced. The term "web treatment" as used herein refers to various operations related to the production of a fiber web 15 in a paper / board machine, such as pressing, drying, calendering, pinene, gluing. The processing device may also be a post-treatment of the fibrous web, e.g., a separate coating device, a printing device or a calender. WO 03 Metso Paper, Inc. describes one such metal belt twisting device and its various embodiments.

20

One problem with this type of metal-belted treatment is to: T: heat the belt and the belt guide roller by rotating them, for example \: * · *: against a working thermal roller, if the rolls do not have water and oil circulation equal to the temperature difference. With belt guide rollers being cold tube rolls; • 25 junction end areas colder because the cold end flanges of the rolls require «· * * • grease to heat and heat is only applied to the flanges when there is a temperature difference. ***. Such a colder region extends about 0.5 m away from the weatherstrip of the metal belt. In addition, the convection cools the flanges as the rolls are rotated. Ko

. the transmission coefficient between the steel belt and the roll is very good, reproduces C

***. ···. Because of the temperature difference on the belt and since the belt is typically over 10 m long, the edges of the s 2 are colder because the convection to the cold hall will cool the flanges unless the catheter is inside the hood.

The object of the present invention is to provide a solution which eliminates the above problems in a relatively simple manner. To achieve this end, the belt guide roller according to the invention is characterized in that electrical resistors are provided at the end flanges. with shielded cables.

The solution according to the invention is less expensive than e.g. k system with piping and displacement pieces. The belt guide rollers have been made similar in design to allow for their interchangeability and are secured in a stationary position. The guiding belt guide roller acting as this roller is arranged to be adjusted at different angles to the web to guide the belt and / or move it to adjust the belts as desired and omits the heating oil so that it is an empty, cold roller. In the solution according to the invention, the Hitti leva power supply cable can be left loose so as to allow the roll t 9 99% *: movements, thereby also allowing the hi f ·; ·. 25 heating of the roller, which is not practically possible in hot-rolled solutions due to movement of the guide / tightening roller, which would cause the extra oil feed pipes to be bent.

The invention will now be described, with reference to the accompanying drawings, in which: Figure 3 is a schematic side view of an embodiment of a belt guide roll according to the invention, and Figure 3 is an end view of the roll of Figure 2.

Fig. 1 shows a prior art meta-belt-twisted processing device in the form of a belted fishfinder comprising a metallized calendering belt 2 which rotates about the belt guide paths 3, at least one of which guide rolls is formed as a guide roll; to adjust the tension of the belt 2 as desired and to tilt it to control the ratio 10 of the belt 2 as desired. The calendering belt 2 passes outside the roller 5, thereby forming a calendering area between the belt 2 and the roller f.

The material path W to be calendered passes through the calender area, delivering the desired pressure pulse and thermal effect as a function of time. Fig. 1 illustrates the shape of the pressure effect when the calendering belt 15 is provided with a press nip roll 4 which silently presses the roll 5 to form a higher pressure in the nip area calender. The dashed line 8, in turn, illustrates the shape of the pressure effect when the contact pressure acting in the lantern area is created solely by the straps, with the nip roll 4 being released from the pressing contact with the strap 2 (20 nip rolls 4 not mounted inside the strap 2). The roll 5, sam nip roll 4, may or may not be deflection compensated roll and is appealed. *:%, which includes: a flexible roll roll such as a polymer coated roll, a · · teaspoon rolled roll or an elastomeric roll, a shoe roll, a thermal roll, a metal roll and a composite roll. Instead of the roll 4, the press member may also be a profile of a fixed profile, which may additionally consist of a plurality of consecutive sections in the direction of the com m. Also, the roller press member 41 • O 9 is formed from several successive sections of the machine transversely. The surface of the purifier * 4 may be formed as a continuous or discontinuous surface. The press is a licensed QHn-pt + aVkcIlcHtph / altiPAn nihmdAn and / or belt k 4 4, gas burner or capacitive heater. In such a solution, elevated temperatures, for example, from about 100 ° C to about 200 ° C and up to about 400 ° C, can be achieved, depending on the application. The elevated temperature, combined with the action time and the wide range of pressure control options, produces good rotation results at both high and low speeds, e.g. 100 i 4000 m / min.

Figures 2 and 3 schematically illustrate a belt cable according to the invention having end flanges 21 with their shafts 22. At the end flanges is mounted a tube 10 with a roller shield 23 for rotation with the end flanges. The outer flanges 21a of the end flanges 21 are provided with electrical resistors 24 which are arranged to engage rotary switches (not shown) arranged in the prior art and known per se (not shown). The electrical resistors may be arranged, for example, as a circumferential unit on the outer surface of the end flange or in a plurality of radially positioned members 15. The outer surface of the end flange can advantageously be further provided with a resilient insulating layer to reduce the heat of heat caused by convection of the end flanges.

Such a solution makes it possible to use relatively cheap and simple hit 20 rollers in conjunction with a metal strap. Further, the invention also allows the roller to act as a guide / tensioning roll by heating the rotary connector with an appropriate amount of power supply cable to allow the roll to move to different positions and / or angular positions.

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Claims (6)

1. Band guide roller for a treatment band provided with a metal band race (2) for a coated or uncoated fiber web, consisting of a strip (2) running around minsi 5 guide roller (3), with which band roller (3) is formed tube roller (20). the body structure stored end flanges (21), to which tubular casing portion (23) rotating with the end flanges, characterizes the end flanges (21) provided electrical resistor (24) for heating the end flanges 2. Ribbon guide roller according to claim 1, characterized in that electrically arranged on the outside of the end flanges. 3. A strip guide roller according to any one of claims 1 or 2, characterized in that the electrical resistor is provided with a thermal insulation layer. 15 4. Band guide roller according to any of the preceding claims, characterized <the roller is a band conductive / stretching roller. 20 • · · • · t • · 1 2 3 * · · • »• · * * 1 • · • · · • · · ··· ♦ • · · ·« «» · »· · • M • 1 ·· · »· 2 • · 1 3 • · # *« • ·