DE1948890A1 - Roller for the pressure treatment of webs - Google Patents

Description

PATENT ADVERTISER 4 DÜSSELDORF, ^ ^en 26.9.1 · 9 ^ 9

DIPL.-ING. WALTER KUBORN K / Ba. 4 DÜSSELDORF

BREHMSTRASSE 23 FERNCUF 632727

KREISSPARKASSE DÜSSELDORF NO. 1014463 -

DEUTSCHEBANKAC ₁ DuSSELDORF 1H4ö890

POST CHECK ACCOUNT: COLOGNE 115211 .iv / tvfv / w

Eduard K ü s t er s machine factory in Krefeld,

Roller for the pressure treatment of webs,

The invention relates to a roller for the pressure treatment of webs, so for Smoothing and embossing of paper and other materials to squeeze moisture off Textiles, for calendering, for pulling out plastic and rubber films and the like, as well as for others Pressing processes, in the form of a hollow body with a flowable, controllable under pressure setting filling for the purpose of variable crowning of the hollow body between its ends.

As is well known, the rollers for the pressure treatment of webs of material suffer during the work a deflection on the side facing away from the point of action of the roller, which the even pressure over the entire length of the roller adversely affected when the roller on its journal against a counter roller or a base is pressed. To remedy this disadvantage, a move has been made to camber the roller. Here, however, there is the disadvantage that each

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Crowning only a certain print size invoice can carry, which means a different roller is required for each print size.

Rollers have already become known which eliminate this disadvantage of the cambered rolls. These rollers work with additional supports and are relatively expensive. -n ■

To remedy the disadvantage of the cambered Rolling, it has already been proposed to give the roll the shape of a hollow cylinder and in the roller is a flowable, to be put under pressure Provide filling in order to bulge the roller through the filling and you one of the cambered rollers to give appropriate shape, which, however, by setting the internal pressure accordingly can be adapted to the respective requirements. The cavity of the hollow cylinder has here the shape of a double cone with in the middle of the roller lying largest diameter, so that the wall thickness the roller decreases from the ends towards the middle. This roll training allows it, the roll a To give different sized crowns is guaranteed but the roller does not work properly, because the crowning defies annoying deflections result or in the case of prevented deflections, the installation of the roller on the material or the action of the Roller on the good · is no longer flawless.

The invention overcomes this disadvantage in that the wall of the hollow body forming the roller in longitudinal section has such a shape that the through the bulge line resulting from the internal pressure the cylinder surface line and when working the Roller under the reaction pressure of the one under the pressure treatment Good resulting deflection

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line are equal to each other or approximately equal to each other. This ensures that the Hollow roller can always be bulged or cambered by exerting a corresponding internal pressure can ensure that the deflections that occur during the pressure treatment are eliminated.

For this purpose, the inner surface line of the can according to the invention with a cylindrical roll circumference The hollow body forming the roll has the shape of a parabola from the roll ends to the roll center second or fourth order or have a shape that approximates as closely as possible to such a parabola.

The ratio of the wall thickness of the hollow body to the outer diameter expediently exceeds this the ratio of the hollow body is not 1:10; because it has been shown that when adhering to this The relationship between the training conditions according to the invention can be achieved in a favorable manner.

The roller is usually made of steel, but their formation from other materials does not excludes.

The drawing illustrates schematically an embodiment of the invention by the Reproduction of a roller in longitudinal section.

In the embodiment shown, the hollow body 1 forming the roller is made of steel. At the ends, the hollow body has pins 2 for mounting it. The circumference of the hollow body is cylindrical, but this does not exclude that the scope within the inventive concept is a little spherical shape is given. The inner wall J of the hollow body has in its surface line from the ends to the middle the shape of a parabola of the second resp. fourth order.

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In the cavity of the roller there is a flowable pressure medium, e.g. a liquid or a plastic mass is provided which is pressurized to bulge or to bulge the roller camber. In the exemplary embodiment, a roller that can be screwed into one end of the roller is used to generate pressure Displacer 4 provided. On a scale, in conjunction with a marking on the handwheel 5 for The set pressure can be read off by actuating the displacer. The supply is also natural a pressure medium from another point or a pressure generation by means of a to the cavity connected pump possible * The pressure medium can can also be used to heat the roller *

It also falls within the scope of the invention the surface line of the inner cavity made of branches of a parabola of the second or fourth order, or part of it to assemble from branches of a parabola of the second order and partly from branches of a parabola of the fourth order and / or the parabolic shape of the surface line to be corrected as precisely as possible to match the deflection line and the expansion excavation line according to practical needs. Such a correction can be used here be expedient that the roller cavity towards the middle to and in the middle a cylindrical or roughly cylindrical From.

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Claims (5)

-P- Patent claims ί) Roller for the pressure treatment of webs of material, for smoothing and embossing paper and other materials, for squeezing off moisture from textiles, for calendering, for pulling out plastic and rubber foils and the like, as well as for other pressing processes, in the form of a Hollow body with a flowable, controllably pressurized filling for the purpose of variable cambering of the hollow body between its ends, characterized in that the wall of the hollow body forming the roller has such a shape in longitudinal section that the bulge line resulting from the internal pressure and that when working of the roller under the reaction pressure of the material subject to the pressure treatment are the same or approximately equal to each other. 2. Roller according to claim 1, characterized in that when cylindrical or approximately cylindrical Roll circumference the surface line of the roll cavity from the roll ends to the roll center the shape or approximately has the shape of a parabola of the second or fourth order. 3. Walae nach'Anspruch 2, characterized in that that the inner surface line from branches or pieces of parabolas of the second or fourth order or partly from branches or pieces of parabolas second and partly composed of branches or pieces of parabolas of the fourth order " 4. roller naoh one of claims 2 and 3, characterized by a correction of the formulaic Parabolic shape of the surface line according to practical needs. 10 9 8 16/1054 194889Ü . ■■ '■■:: ■ - 6 ■ - ■■■■. ■■ ■ -: 5. Roller according to one of claims 2 to 4, characterized in that the roller cavity towards the middle and cylindrical or approximately in the middle has a cylindrical shape. 6, roller according to one of claims 1 to 5, characterized in that the ratio of the wall thickness of the hollow body to the outer diameter of the Hollow body does not exceed the ratio Ii10 109816/1054