METHOD AND DEVICE FOR FINISHING AN ENDLESS FABRIC

Abstract

In a method and a device for finishing an endless fabric, the endless fabric is transported past a rotating applicator roll that is wetted with a liquor, in order to apply the liquor onto the endless fabric. On the endless fabric that has been transported onwards, after drying, the thread add-on, or its change, is measured and evaluated on an ongoing basis by a sensor, in order to regulate the rotational speed of the application roll as a function of the measuring result. A device is suitable for implementing the method.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating a method sequence according to an example embodiment of the present invention.

DETAILED DESCRIPTION

As illustrated in FIG. 1, an endless fabric 3 is transported in the direction of the arrow, which is drawn in only in outline. Textile endless fabric 3 may, for example, be brought in directly from a production method. Using roll configuration 1, the application of liquor takes place using a rotating applicator roll 2 that is partially dipped in a liquor tank and is thus continually wetted by liquor 10. To enlarge the contact surface between the surface of applicator roll 2 and textile endless fabric 3 that is transported past it while touching it, endless fabric 3 is partially diverted around application roll 2, using two guide rolls 6. The rotational speed of applicator roll 2 may be a significant variable for the application of the liquor, so that the thread add-on ensuing after the drying of the endless fabric may be particularly well regulated by varying the rotational speed of application roll 2. After the application, textile endless fabric 3 is conveyed through a drier 5. After drying, the thread add-on is measured in a contactless manner, using a sensor 4, on endless fabric 3 that is guided vertically past sensor 4, using two diversion rolls 7. The vertical alignment of endless fabric 3 and the sensor, in the vertical conveying section of the endless fabric, provides that no covering in dust occurs on the sensor surface, which could impair the measurement. The result of the measurement is transmitted as an actual value T to control and regulation unit 9. The control and regulation unit 9 compares actual value T to an empirically ascertained setpoint value S. The rotational speed of applicator roll 2 is regulated as a function of the deviation of actual value T from setpoint value S, using a manipulated variable E. The measurement of the thread add-on by sensor 4 takes place on an ongoing basis, e.g., continuously. After the measurement, textile endless fabric 3 is conveyed onwards for further processing, storage or for transportation to a wind up roll 8.

LIST OF REFERENCE CHARACTERS

• 1 roll configuration
• 2 applicator roll
• 3 textile endless fabric
• 4 sensor
• 5 drier
• 6 guide rolls of the kissroll applicator
• 7 diversion rolls
• 8 wind up roll
• 9 control and evaluation unit
• T actual value
• S setpoint value
• E setting value

Claims

1. A method for finishing an endless fabric, comprising: transporting the endless fabric past a rotating applicator roll that is wetted with a liquor to apply the liquor onto the textile endless fabric;measuring and evaluating a thread add-on a dry endless fabric in an ongoing manner on the endless fabric that has been transported onward; andregulating a rotational speed of the applicator roll as a function of a result of the evaluation.

2. The method according to claim 1, wherein the measuring and evaluating includes measuring and evaluating on an on-going basis an effect of the endless fabric on electrical properties of a capacitor to measure the thread add-on.

3. The method according to claim 1, further comprising comparing the result of the evaluation to an empirically ascertained setpoint value that represents a desired thread add-on; wherein the regulating includes influencing the rotational speed of the applicator roll by actual value/setpoint value matching.

4. The method according to claim 2, wherein the capacitor is arranged as a plate-type capacitor supplied with a periodic supply signal having a specified signal shape, the method further comprising scanning a modification of a response signal connected with a change in the thread add-on during at least one signal period at least one discrete point in time, at least one discrete scanned value being used in the evaluation.

5. The method according to claim 1, wherein the regulating includes increasing the rotational speed in response to a decrease in the thread add-on compared to a setpoint value and reducing the rotational speed in response to an increase in the thread add-on compared to the setpoint value.

6. A device, comprising: a roll configuration having a rotatable applicator roll wettable with a liquor;a transportation device configured to transport an endless fabric past the applicator roll to apply the liquor onto the endless fabric;a drier configured to dry the endless fabric;a sensor, arranged after the drier in a direction of transportation, configured to measure a thread add-on; andan evaluation and control unit configured to regulate a rotational speed of the applicator roll as a function of a measurement of the thread add-on.

7. The device according to claim 6, wherein the sensor includes a plate-type capacitor configured to generate an electrical field, past which the endless fabric is transportable.

8. The device according to claim 6, wherein the device is configured to perform the method according to claim 1.

9. A device, comprising: roll means having rotatable applicator roll means wettable with a liquor;transporting means for transporting an endless fabric past the applicator roll means for applying the liquor onto the endless fabric;drying means for drying the endless fabric;sensing means, arranged after the drier means in a direction of transportation, for measuring a thread add-on; andevaluating and controlling means for regulating a rotational speed of the applicator roll means as a function of a measurement of the thread add-on.