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Publication numberUS3682133 A
Publication typeGrant
Publication dateAug 8, 1972
Filing dateAug 3, 1970
Priority dateAug 7, 1969
Also published asDE2037961A1, DE2037961B2
Publication numberUS 3682133 A, US 3682133A, US-A-3682133, US3682133 A, US3682133A
InventorsGomarin Claude, Vidal Jean
Original AssigneeTunzini Ameliorair Soc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Machines for coating a product in a band
US 3682133 A
Abstract
The machine includes a heating drum and a press roller ensuring the deposition on the heating drum of the material intended for the coating. Cooling means for the press roller are provided to act from the outside over a fraction only of the cylindrical wall of the press roller. The machine enables the coating of a product in a band by a material which has to undergo a heat treatment.
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Description  (OCR text may contain errors)

United States Paten Gomarin et al. 14 1 Aug. 8, 1972 1 MACHINES FOR COATING A [56] References Cited [72] (;I BAND Ch UNITED STATES PATENTS nven ors: au Gomari Mame; Jean 1, fijgg fg g 3,239,367 3/1966 Demeter ..1 18/202 f France 2,711,132 6/1955 Viscardi ..118/202 2,724,362 11/1955 Burke et a1... ..118/202 [73] Pans 3,548,781 12/1970 l-lomungm, ..118/202 [22] Filed: Aug. 3, 1970 Primary Examiner-Henry S. Jaudon 21 APPL 0 357 Attorney-Larson, Taylor and Hinds [30] Foreign Application Priority Data [57] ABS CT d d The machine includes a heating rum an a press I Aug. 7, France roller ensuring the deposition on the heating drum f the material intended for the coating. Cooling means 12?} ll'f'il':::1:J:iiiiiijjiiiiiijjijijiaa z53%;!11383 for the Press roller are Provided to w from the 5 Field f Search 1 18202 24 2 2. 101/ 9 side over a fraction only of the cylindrical wall of the v 1 1 2 press roller. The machine enables the coating of a product in a band by a material which has to undergo a heat treatment.

7 Clains, '4 Drawing figures mimmms W2 3.632 133 SHEEI 1 [IF 2 PATENTEDAus' 8 m2 SHEET 2 [IF 2 MACHINES FOR COATING A PRODUCT IN A BAND The invention relates to machines for coating a product in a band by material which has to undergo a heat treatment (plasticizing, polymerization, etc.), these machines being of the type which include a rotary drum of which the cylindrical wall is heated, the band to be coated being applied on this cylindrical wall over The machine of the type concerned includes cooling means for its press roller which are arranged so as to act from the outside over a fraction only of the cylindrical wall of the press roller, this fraction extending from the support zone of the press roller the heating drum up to a zone where the material intended for the coating is deposited on the press roller.

In a first embodiment according to the invention, these cooling means are constituted by a blower device a fr nly of its Circumference, h material for a cooling gas including a blower wall parallel to the tended for the coating being deposited on the said cylindrical wall by a roller rotating in reverse sense to the drum, (i.e. both clockwise or both anticlockwise), parallel with this latter and applied against the said drum at the level of a support zone located in the remaining fraction of its circumference.

Such machines for coating are well known and are deslilgnated, in the technique, by the name Reverse- Ro In the following the rotary drum of which the cylindrical wall is heated will be designated by heating drum and the roller ensuring the deposit of the material lilntended for the coating will be designated by press to er.

The heating roller is constituted, at least as regards its cylindrical wall, by a metal hard and a good conductor of heat, such as steel, while the press roller is constituted, at least as regards its cylindrical. wall, by a deformable and elastic material such as rubber.

This press roller is applied against the heating drum so that there exists between the press roller and the heating drum, not a contact generator, but a contact rectangle whose width can reach several centimeters.

It will then be seen that there is, at the level'of such a support zone, a transmission of heat by conduction between the heating drum and the press roller, and that, failing special precautions, the cylindrical wall of this press roller is heated, which risks initiating the heat treatment of the material intended for the coating before the latter is deposited on the cylindrical wall of the heating drum.

Now the fact this heat treatment takes place before the deposition spoils considerably the quality of the coating, especially from the point of view of its regularity and of its adherence.

To avoid this drawback, it is not possible technically to cool the heating drum between the zone where the product in a coated band leaves its cylindrical surface and the support zone of the press roller. Moreover, such a cooling would alter the homogeneity of heating of the material intended for the coating and its heat treatment would thereby be rendered more difficult.

It is also impossible to contemplate an internal cooling of the press roller since, due to the fact of its mechanical properties of deforrnability and elasticity of its cylindrical wall, the latter is necessarily constituted of a material of which the thermal coefficient of conductivity is low, which hence does not enable internal cooling of the press roller to be contemplated by circulation of a cooling fluid on the inside of the said roller.

It is an object of the invention to provide cooling means for the press roller which are efficient, simple, compatible with the characteristics of the machine, and which do not introduce in practice any additional complication in the operation, the maintenance and the adjustment of the machine.

cylindrical wall of the press roller between the support zone on the heating drum and the zone where the material intended for the coating is deposited, this blower wall being provided with blower nozzles and with suction nozzles for the evacuation of the cooling gas.

In a second embodiment according to the invention, these cooling means are constituted by a plurality of rotary cooling rollers, arranged parallel to the press roller and applied against the latter so as to define a contact rectangle between each cooling roller and the press roller, each cooling roller being hollow, constituted of a metal of which the coefficient of conductivity is high, and traversed by a cooling fluid (liquid or gas).

Thus, due to such cooling means, it is possible to cool the press roller in a manner which is efficient, simple, compatible with the characteristics of the machine (especially as regards the prevention of any direct contact between the outer surface of the cylindrical wall of the press roller and a liquid), and which does not introduce in practice any additional complications in the operation, the maintenance and the adjustment of the ma chine.

On the latter point, it should be noted that the cooling means can be mounted in retractable manner to be spaced from the press roller (by pivoting or translation) at the time of operations, of maintenance and of adjustment of the machine.

The invention consists, apart from the features which have just been considered, of certain other features which are used preferably at the same time and which will be more explicitly considered below.

In order that the invention may be more fully understood, several preferred embodiments of machines according to the invention are described below, purely by way of illustrative but non-limiting examples, with reference to the accompanying drawings in which:

FIG. 1, shows a diagrammatic partial section of one embodiment of the machine for the coating of a product in a band, constructed according to the invention;

FIG. 2 shows a section on a large scale illustrating a detail of the embodiment shown in FIG. 1;

FIG. 3 shows in partial section, a first embodiment according to the invention; and

FIG. 4, lastly, shows a partial section of another embodiment according to the invention.

The machine for the coating of a product in a band 1 is shown schematically in FIG. 1.

This machine includes a rotary heating drum 2, with a horizontal axis. Heating means are provided so that the outer surface of the cylindrical wall of this heating drum 2 is brought to a given temperature which, as far as possible, is homogeneous and constant over the said outer surface. The cylindrical wall of the heating drum 2 is hence of a material which is a good conductor of heat, and hard, for reasons which will appear clearly in the following. This material can be steel.

The temperature of the outer surface of the cylindrical wall of the heating drum 2 must be such that the material intended for the coating and which is deposited on this cylindrical wall undergoes the desired heat treatment to obtain the desired coated product.

The band 1 of product is applied on the cylindrical wall of the heating drum 2 over a fraction only of its circumference. According to the embodiment illustrated in FIG. 1, this fraction covers an angular range of about 250. Two return rollars 3 and 4 are provided at the two ends of this angular range to ensure the application of the band 1 on the heating drum 2.

The material 5 intended for the coating is deposited on the outer surface of the cylindrical wall of the heat-' ing drum 2 by a press roller 6 rotating in reverse sense to the heating drum 2 (i.e. both clockwise or both anticlockwise), parallel with the latter and applied against the said heating drum 2 at the level of a support zone located in the remaining fraction of its circumference.

With reference to the first return roller 3 from which the product in a band 1 is applied on the heating drum 2, the support zone where the deposition of the material 5 intended for the coating occurs, is situated about ahead of this first return roller 3.

The press roller 6 has a diameter distinctly less than the diameter of the heating drum 2 and it is constituted, at least as regards its cylindrical wall, by a deformable and elastic material. This material can be rubber.

As shown in FIG. 2, this press roller 6 is applied against the heating drum 2 so that there exists between the press roller 6 and the heating drum 2 a contact rectangle. By way of example, it should be indicated that for a diameter of 1,200 mm of heating drum 2 and of 250 mm for the press roller 6, the width of this contact rectangle is 20 mm. In this example, the speeds of rotation (in reverse sense) of the heating drum 2 and of the press roller 6 are such that the respective peripheral tangential speeds are 18 meters per minute and 21 meters per minute.

The material 5 intended for the coating is then deposited on the press roller 6 by a first auxiliary roller 7, rotating in reverse sense to the press roller 6, parallel with the latter and applied against the said press roller 6 at the level of a support zone diametrically opposite the support zone of the press roller 6 against the heating drum 2.

There is provided a second auxiliary roller 8, rotating in reverse sense to the first auxiliary roller 7, parallel with the latter and applied against the said first auxiliary roller 7, the axes of the two abovesaid auxiliary rollers 7 and 8 being, approximately at least, in the same horizontal plane.

1n the sense of rotation of the heating drum 2, a scraper blade 9 is provided above one of the auxiliary rollers 7 or 8, this blade 9 retaining the material 5 intended for the coating and which finds itself above the abovesaid auxiliary rollers 7 and 8 and between them. If the sense of rotation of the heating drum 2 is that indicated in FIG. 1, this blade 9 is above the second auxiliary roller 9.

The auxiliary rollers 7 and 8 are of steel and have advantageously the same diameter as the press roller 6.

Their speeds of rotation are such that, in the case of the figures indicated previously, the peripheral tangential speed of the first auxiliary roller 7 is 21 meters per minute and that of the second auxiliary peripheral roller 8 is 1 meter per minute.

In such a machine, the material 5 intended for the coating is deposited in the form of a sheet 5a on the first auxiliary roller 7, then this sheet 50 passes over the press roller 6 and finally on the heating drum 2 where it becomes interposed under the band product 1 from the first return roller 3.

This being the case and according to the main feature of the invention, the machine comprises cooling means 10 from the press roller 6 which are arranged so as to act from the outside over the fraction of its circumference which extends from the support zone of the press roller 6 on the heating drum 2 up to the support zone of the press roller 6 on the first auxiliary roller 7.

By Way of example, it should be indicated that, for an apparatus whose heating drum 2 has a diameter of 1,200 mm, the press roller 6 and the first auxiliary roller 7 a diameter of 250 mm, the support zones of the press roller 6 on the heating drum 2 and on the first auxiliary roller 7 are separated by an angilar distance of about 130to 150.

In the embodiment according to the invention illustrated in FIG. 3, these cooling means 10 are constituted by a blower device for cooling gas (air at ambiant temperature or previously cooled air). This blower device includes a blower wall 1 1 parallel to the cylindrical wall of the press roller 6 between the support zone on the heating drum 2 and the support zone on the first auxiliary roller 7. This blower wall 11 is provided with blower nozzles 12 and with suction nozzle 12 for the removal of the cooling gas. A supply caisson or tank 14 and an evacuation caisson or tank 15 enable respectively the supply of the blower nozzles 12 and evacuation from the suction nozzle 13.

Advantageously, the two ends of the blower wall 11 neighboring the support zone on the heating drum 2 and the support zone on the first auxiliary roller 7 include suction nozzle 13.

With such cooling means supplied with air at 20 C and with a flow of 2,500 m3/h, it is possible to maintain the temperature of the cylindrical wall of the press roller 6 at a value less than or at the most equal to 40C while the temperature of the cylindrical wall of the heating drum 2 is of the order of to C.

In the embodiment according to the invention illustrated in FIG. 4, the cooling means 10 are constituted by a plurality of cooling rollers 16, rotating, arranged parallel to the press roller 6 and applied against the latter so as to define a contact rectangle between each cooling roller 16 and the press roller 6.

Each cooling roller 16 is hollow and constituted of metal whose coefficient of thermal conductivity is high, a cooling fluid, preferably a liquid, passing through each of the abovesaid cooling rollers 16.

As a result of which and whatever the embodiment adopted, there is provided an apparatus for the coating of a'band product in which the cooling means for the press roller are efficient, simple, and avoid any risk of the commencement of thermal treatment of the material intended for the coating on the cylindrical wall of the press roller.

The coating is hence effected under good conditions of regularity and of adherence.

Moreover, these cooling means are compatible with the characteristics of the machine, especially as regards the prevention of any direct contact between the outer surface of the cylindrical wall of the press roller and a iquid.

Finally, these cooling means do not introduce in practice additional complications in the operation, the maintenance and the adjustment of the machine.

As if self-evident and as emerges already besides from the preceding description, the invention is in no way limited to those of its methods of application, nor to those of its methods of production of its various parts, which have been more especially indicated; it embraces, on the contrary, all variations.

We claim:

2. Machine according to claim 1, wherein the two ends of the blower wall neighboring the support zone and the feed zone include suction nozzles.

3. Machine according to claim 1, wherein said heating drum is of steel and said press roller is of rubber.

4. Machine according to claim 1, wherein said feed means comprise two auxiliary rollers and a scraper blade.

1. Machine for coating a product in band form with a 5 material which has to undergo heat treatment, said machine comprising a rotary heating drum having a cylindrical wall, means for applying said band on said cylindrical wall over a fraction only of its circumference, a press roller arranged to deposit said material on said cylindrical wall, said press roller being arranged to rotate in reverse sense to, parallel with the heating drum, and applicable against the heating drum at the level of a support zone located in the remaining fraction of its circumference, feed means for applying said material to the press roller at a feed zone thereof, cooling means for the press roller arranged to act from the outside over a portion only of the cylindrical wall of the press roller, said portion extending from said support zone up to said feed zone, said cooling means being constituted by a device for blowing a cooling gas, said device including a blower wall parallel to the cylindri- 5. Machine according to claim 4, wherein said auxiliary rollers are of about the same diameter as the press roller.

6. Machine for coating a product in band form with a material which has to undergo heat treatment, said machine comprising a rotary heating drum having a cylindrical wall,

means for applying said band on said cylindrical wall over a fraction only of its circumference,

a press roller arranged to deposit said material on said cylindrical wall,

said press roller being arranged to rotate in reverse sense to, parallel with the heating drum, and applicable against the heating drum at the level of a support zone located in the remaining fraction of its circumference,

feed means for applying said material to the press rtfller at a fee zone thereof, coo ng means or the press roller arranged to act from the outside over a portion only of the cylindrical wall of the press roller, said portion extending from said support zone up to said feed zone, said cooling means being constituted by a plurality of cooling rollers arranged to rotate parallel to the press roller and applied against the latter so as to define a contact rectangle between each cooling roller and the press roller, each of said cooling rollers being hollow, constituted of a metal whose coefficient of thermal conductivity is high and adapted for the passage of a cooling fluid therethrough. 7. Machine according to claim 6, wherein said cooling fluid is a liquid.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2711132 *Jul 28, 1952Jun 21, 1955Viscardi CorpMethod for printing and coating
US2724362 *Jan 12, 1953Nov 22, 1955Royal Mcbee CorpWax carbon spot printing machine
US3239367 *Feb 27, 1963Mar 8, 1966Demeter JozsefMethod and apparatus for producing plastic coated carriers
US3548781 *Jun 21, 1968Dec 22, 1970Smithe Machine Co Inc F LHot melt adhesive applicator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3784406 *Jan 24, 1972Jan 8, 1974Esb IncMethod of applying battery electrodes onto continuous carrier strip
US3993025 *May 19, 1975Nov 23, 1976Metzeler Schaum Gesellschaft Mit Beschrankter HaftungMachine for the continuous reverse-coating of sheet-form material with polyurethane foam
US4261286 *Jul 9, 1979Apr 14, 1981Maschinenfabrik Max KroenertApparatus for coating of moving sheets with a contact adhesive
US4932352 *Mar 8, 1988Jun 12, 1990Institut Francais Du PetroleMethod and device for impregnating an elongate element
Classifications
U.S. Classification118/202, 118/262
International ClassificationB05C1/08, B05C1/12
Cooperative ClassificationB05C1/12
European ClassificationB05C1/12