FI83551B - Press part in a paper machine - Google Patents

Description

The invention relates to a press part of a paper machine, in particular to a press part in which cavities are used.

There are some problems with the press section of a paper machine that this invention seeks to solve. First, the paper machine room 10 is very noisy, which noise is mainly due to the suction roll or rolls of the press section. The dry matter content of the web after the press section is also often unsatisfactory, partly due to the inability to maintain the temperature of the web at a sufficient level. In this connection, the rewetting of the web has also been a problem.

15

It is previously known to enclose the wire part and the drying part of a paper machine inside a hood. If the press section could also be enclosed inside the hood, warm air could be introduced into the press, which would help to increase the dry matter content of the pressed web.

20

The placement of the press section inside the hood has not previously been considered motivated, as its construction has only been considered in terms of heat economy.

As is already known, a steam box is used in the spray section to heat the paper web and to increase the dryness of the post-press web. to produce a substance content. The use of a steam boiler is based on the fact that when water vapor condenses on the surface of the web, it transfers to it a large heat of heat. It has been calculated that the press section cannot be kept at such a high temperature (100 ° C) as to replace the steam box, as it is feared that a high temperature in the press section would lead to a slow cooling of the purple design and corrosion problems.

The object of the invention is to provide such a press-35 part of a paper machine in such a way that as many of the above-mentioned problems as possible are avoided.

2 83551 Ί More specifically, the object of the invention is to reduce noise in the spray section with a structure which at the same time provides a heat-economic benefit without the structure having any other significant disadvantages.

In order to achieve the above objects, the press part according to the invention is mainly characterized in that the press part is covered with a hood which is structured in such a way that it both raises the dusting temperature of the press part and substantially reduces the ambient noise level.

10

The walls of the housing or hood structure according to the invention are made of a sufficiently sound-insulating material to reduce harmful noise in paper mills. For example, soft wool, which repels water or polyurethane-15, can be used as the sound and thermal insulation of the vertical wall and roof.

When air heated to 40-80 ° C is introduced into the encapsulated press section, the dry matter content of the web increases and the rewetting of the web decreases.

If the temperature is kept at 40 ° C, it is advantageous in that the corrosion tendency of the blade (Fe 2 Y) is at a minimum.

The hood structure of the press part according to the invention is preferably, for example, such that it has movable walls on the treatment side, which walls overlap, e.g. on wheels, on a rail. The movable wall element 25 receives the force required for the transfer, e.g. from an electric motor with a gear transmission.

The back material is preferably transparent on the treatment side so that the operation of the machine can be easily monitored. The transparency of the vertical wall is achieved by 30 e.g. a heat glass which is not "frosted" despite the temperature differences. The window is preferably provided with a seal which holds it firmly in place. The rubber seal acts as the window frame. When replacing the felt and roll, openings are required, from the front of which the roof and wall elements can be moved away.

The paper web preferably has an air-heated plate between the press bodies, which is made in one press. Disc Library

II

35 3 83551 1 it must be possible to walk on top of which the felt tensioner, felt vacuum cleaners, high-pressure shower and felt lubrication shower are maintained. The moisture profile after the blankets must also be able to be measured from the top of the panel.

5 The wall element is suitably constructed to be portable and the ceilings and the wall form the letter L, which makes it possible to change the roll and the felt. The wall and roof must simultaneously move out of the area where the break occurred. The simplest load-bearing structure is obtained in the form of a profile L.

10

The movable parts of the hood can advantageously be connected to an automatic breaker which, in the event of a break, automatically opens the part of the hood where the break has occurred.

The movable walls of the hood structure are preferably double and the space between them is sealed.

Use of the hood side wall can be fixed, thus requiring only a simple wall. A longitudinally movable wall 20 of the machine may be necessary in some applications, in which case an overlapping pile wall is also required on the treatment side of the break. It can also be a two-part telescopic wall that can be lifted.

The normal walls of the building close the basement space. The wall of the hood has 25 openings for a wire.

At the junction of the press hood and the hood of the drying section there is a "heated panel" * double roof, through the intermediate space of which warm air is led from the press hood to the drying hood, which prevents the roof sweating.

30

Today, more attention is being paid to working conditions and, in particular, noise nuisance. The invention provides a cost-effective solution to the noise problems of the press section while serving thermoeconomic purposes. Thanks to the invention, the noise nuisances of the press section of the paper machine can be substantially reduced and the dry matter content of the paper web can be increased by the felt structure without at the same time causing considerable roll change and felt change problems.

4,83551 1 The hood structure according to the invention can be implemented in many different ways, varying e.g. the building materials and the wall thickness and the number of movable walls. Its use can also be made more or less automatic.

5

The invention will now be described in detail with reference to a preferred embodiment shown in the figures of the accompanying drawing. However, the invention is not narrowly limited to the details in this example.

10

Figure 1 shows the press part and the hood structure according to the invention seen in the pedal direction of the machine.

Fig. 2 is a partial enlargement of Fig. 1, showing a part of the back element 15 moving on wheels on a rail.

Figure 3 shows the press part and the hood structure according to the invention in the longitudinal direction of the machine.

Figure 1 shows the press section in the pedal direction of the machine generally at 1 and the surrounding hood structure according to the invention is generally indicated at 2. The press section of Figure 1 shows two rollers 3 and 4. The basement 5 closes the normal walls 6 .

On the dead side of the press section there is a movable hood roof and wall structure 8 according to the invention, which structure is L-shaped in vertical cross-section. This allows for changes of rollers and blankets. The self-supporting structure 8 overlaps on wheels 9 on rails 10. The wheel 9 is driven by a motor 11. On the drive side, the wall structure 30 12 of the hood can be fixed and can be single or double.

Figure 2 shows the press part 1 and the surrounding hood structure 2 according to the invention in the machine direction. Figure 2 shows the wire loops 17 passing over the rollers 16 of the press section. The wall structure 8 has an opening 13 for the forming-35 wire. Figure 2 also shows the lower walls 7 shown in Figure 1, the basement space 5 and the overlapping hood wall 5 83551 and roof structures 8 according to the invention. The hood of the drying section following the press section is indicated by reference numeral 15.

The following are claims which, within the scope of the inventive idea defined by the invention, may vary in detail.

10 15 20 25 30 35

Claims (10)

6,83551 ^ Claims A press section of a paper machine, in particular a press section using suction rollers, characterized in that the press section is covered with a structure which raises both the operating temperature of the press section and substantially reduces the noise level outside the press section, and that said hood is formed on the side of the movable wall and ceiling elements (8) and on the use side of the movable or fixed wall elements (12). 10 Press part according to claim 1, characterized in that said hood elements (8, 12) are made of a sound-insulating material, such as polyurethane wool lined on the inside or soft water-repellent wool. 15 Press part according to Claim 1 or 2, characterized in that the wall material is transparent on the treatment side, e.g. a heat-glass element which remains clear. Press part according to one of Claims 1 to 3, characterized in that the movable wall and roof elements (8) of the hood move overlapping on wheels (9) or rails on overlapping wheels (9). Press part according to Claim 4, characterized in that the wheel (9) or wheels of the elements are driven by a motor or are moved manually. Press part according to one of Claims 1 to 5, characterized in that the wall elements (8, 12) of the hood are designed to be self-supporting. Press part according to one of Claims 1 to 6, characterized in that the movable roof and the wall (8) of the hood are L-shaped in vertical cross-section. Press part according to one of Claims 1 to 7, characterized in that the movable parts of the hood are connected to an automatic breaker which, in the event of a break, automatically opens the part of the hood in which the break has occurred. 5 Press part according to one of Claims 1 to 8, characterized in that the movable hood walls (8) are double and that the wall gap is sealed. Press part according to one of Claims 1 to 9, characterized in that the wall of the hood (12) is a two-part telescopic wall which can be raised. 15 and 20 25 30; 35 8 83S51 Ί Patentkrav