DE2536168A1 - Constant temp. cylinders for e.g. calenders in textile or paper mfr. - using easily volatised oil condensing on outer cylinder - Google Patents

Abstract

The constant temp. is maintained by partially filling the annular space between the periphery of the cylinder and a second concentric inner cylinder with an easily volatilised oil, (b) pumping out of the annular space to a predetermined press. at atmospheric temp. and subsequent sealing of this space, (c) evaporating the easily volatilised oil at a temp. determined by the pressure in the annular space using a heating medium which is present between the wall of the second cylinder and a third inner most concentric cylinder. The constant temp. maintained on the outside of the cylinder can be predetermined by the press. above the oil in the annular interspace rather than by the supply of heat.

Description

Your reference Your message from 899 Lindau (Bodensee)

Rennerle 10 P.O. Box 3160

July 29, 1975

Reference:

Hunt & Moscrop Limited

Apex Works, Middleton, County of Lancester / England

Method of maintaining a substantially constant temperature on the outer surface of a Cylinder for use in the textile, paper or other industries

Addition to P 23 23 662.6

The invention relates to an improved method of heating cylinders and vessels for use in the textile and paper industries and represents an improvement or modification of the description of our earlier application P 23 23 662.6 represented the invention.

In our earlier application P 23 23 662.6, a method for heating cylinders or vessels is described in order to do so to achieve a constant surface temperature, with partial the annular space between a double

time: Bank accounts:

: h agreement Bayer. Association

Bavarian Hypothi

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Telephone Telegraph: Office hours: Bank accounts: Postal check account:

Lindau (08382) 6917 05 4374 by appointment Bayer. Vereinsbank Lindau (B) No. 12Π rs 7s Munich 295 25-809

Bavarian Mortgage and Exchange Bank Lindau (B) No. 278920

walled cylinder is filled with a liquid, the air is expelled from the annular space and the outlet opening is sealed, then the inside of the inside of the cylinder or vessel is heated, whereby the Heat is transferred to the liquid, which now boils, evaporates and condenses at a temperature that the Inside of the inner wall corresponds, and the temperature is regulated by limiting the heat absorption.

It has now been found that a volatile oil is the most suitable Liquid for partially filling the annular space between the walls of the two concentric cylinders and the improvement now includes the use of the same oil as the space between the two cylinders in part filling liquid.

According to the invention includes a method of maintaining a substantially constant temperature on the circumference of a cylinder for use in textile, Paper or other industry partially filling the annular space between the circumference of the cylinder and of a second concentric inner cylinder with a slightly volatile ec, emptying the cylinder on one predetermined pressure under atmospheric temperature and

- 2 a -

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sealing the annular space, evaporating the easily volatile oil at a temperature determined by the pressure in the annular space, received by a heating medium between the wall of the second cylinder and a third innermost concentric cylinder, the latent The heat of the volatilized oil is essentially constant Maintains temperature on the circumference of the cylinder.

The invention is described with reference to the accompanying drawings. It shows:

Fig. 1 is a side view of the partially sectioned cylinder;

Fig. 2 is a cross-sectional view of the same.

The device for carrying out the method comprises a rotating outer cylinder 1 and two concentric inner cylinders 2, 3, which are closed on their front side by end caps 4.

A heating medium in the form of a volatile oil 7, such as is sold under the trademark THERHiIAX, is inserted around the annular space 5 between the wall of the cylinder 1 and the wall of the cylinder 2 partially

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to fill, with air being sucked from the annular space lüird to adjust the pressure therein to a predetermined pressure under atmospheric pressure and the inlet to the annular space is sealed.

The annular space 8 between the cylinder 2 and the Cylinder 3 receives a heat source, uiie for example electric heating elements or steam or oil that is introduced and pumped through, whichever is the most volatile Oil evaporates at a temperature corresponding to the reduced pressure in the annular space, and the vapor of the easily volatile oil condenses on the outer wall of the outer cylinder 1 and gives off its latent heat thereon and holds so a uniform temperature over the circumferential surface of the Cylinder 1 upright.

A series of baffles 5a or stirring strips are provided which extend radially outward from the cylinder 2, to cause the steam or boiling oil to circulate as the cylinder rotates on a U / elle 6 and thereby helps to keep the peripheral temperature constant.

It has now been found that a highly volatile oil is the most suitable liquid for partially filling the annular space between the walls of two concentric Cylinder is, and the improvement includes the use

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of such a highly volatile oil as the liquid which partially fills the space between the two cylinders

Claim

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Claims (1)

Claim Method of maintaining a substantially constant Temperature on the circumference of a cylinder for use in textile, paper or other industries, characterized by partially filling the annular space between the periphery of the Cylinder (1) and a second concentric inner cylinder (2, 3) with a volatile oil (7), the pumping out of the cylinder to a predetermined pressure below atmospheric temperature and sealing the annular Room (8), the evaporation of the volatile oil at ainer temperature caused by the pressure in the annular space is determined by ain heating medium, which is between the land of the second cylinder (2) and a third innermost concentric cylinder (3) is received, the latent heat from the vaporized oil one maintains substantially constant temperature around the circumference of the cylinder. 709808/0561