DD241092B1 - METHOD FOR CONTROLLING THE PLANT SUCCESS OF WAESSED SOLUTIONS OF CHEMICAL PRODUCTS - Google Patents

Abstract

The functional connection between the peripheral speed of the slop roll and the liquor vol. conveyed by the roll depending on the liquor viscosity is determined experimentally. This interrelation is used to control the liquor appln. on the basis of the functional interrelation of the roll and the fabric speed while taking into consideration the parameters of the target vol. and surface mass.

Description

Field of application of the invention

The invention relates to a method for controlling the order of a fleet when using a nip roll, i. a roller immersed in the liquor to be applied and continuously covered with a liquor film during rotation, for application of aqueous solutions of chemical products.

This process is intended to be used, in particular, for controlling the liquor order in synthetic resin equipment according to the Pf latsch principle, as well as for all textile finishing processes in which treatment liquors are used in the impregnation or in an application process, eg. As spraying, applied to fabrics.

Characteristic of the known technical solutions

From CH-PS 530233 a process for refining cellulosic textile material is known. In this case, the liquor order is controlled in the padding process by means of two different methods.

In a known technical solution, the liquor order is controlled by the fleet consumption, wherein the amount of consumption calculated in advance is added to the trowel and the speed of the nipper is continuously changed via a level sensor so that the fleet level remains constant in the trough. Thus, the fleet order necessarily corresponds to the fleet inflow.

The disadvantage here is especially that this system reacts extremely slowly.

A second technical variant is that continuously operating recording systems, for example, based on radiation absorption, are used, wherein the measurement signal can be used directly to control the Plattwalzen peripheral speed.

In CH-PS 535074 a device for continuous uniform application of treatment liquors to textile material is described in which up to three measuring devices for measuring the basis weight and / or the liquid content of the textile material are present. For this purpose, non-contact measuring principles such as the Remittenz of microwaves or infrared rays and the already mentioned in the CH-PS 530233 radiation absorption proposed.

The disadvantage of the method and the device is that:

- A high, not unrestricted appropriate metrological and cost-related effort to control the speed of the plucking roller must be driven

- This metrological effort tripled when the better in terms of quality failure and effectiveness wet-on-wet method is to be applied.

Object of the invention

The aim of the invention is to automatically control a defined liquor order while eliminating the aforementioned disadvantages in a technologically simple manner.

Explanation of the essence of the invention

The object of the invention is to provide a method of the type characterized in the introduction, wherein the fleet order can be controlled automatically in dependence on the web speed. According to the invention the object is achieved in that the liquor order is controlled automatically according to a defined context involving the parameters viscosity of the liquor, target amount and basis weight without the basis weight of the textile fabric and / or the subsidized or applied liquor quantity must be measured. The following forms are used for the determination:

Q _e = Q _o (e ^kVu -1), V _u <15 ^m - (1a)

<15 m m min

^ (1b)

mm.

where in these formulas

Q, fleet amount

Vu peripheral speed of the plucking roller

Q ₀ , m, k, a Quantities whose amounts for any range of m, v _w and the viscosity determined by the experiment

functional relationship have been calculated mean.

The variables Q ₀ , k, m and a are dependent on the liquor viscosity, the roll diameter and the roll surface. Thereafter, using the equations (1a), (1b), the liquor order is controlled on the basis of the functional relationship between the peripheral speed of the placer roller and the goods speed, taking into account the parameters target target quantity and basis weight. The following formulas are used for the calculation of this relationship:

V ₁₁ - 1-In (I ₊ _m_ ₍

к Q ₀ mm

_{(2 B)}

m min

where in these formulas

C ₃ Target Quantity

m _{F basis} weight

b goods width

V _w goods speed

mean.

In carrying out the method according to the invention, the equations (2 a), (2 b) in an electronic circuit, which forms the core of a control unit exploited. This control unit supplies depending on the goods speed, the manipulated variable for the drive of the plucking roller.

The influence of the technological parameters basis weight, liquor viscosity and target deposit quantity is taken into account in the control unit by means of a programmable microelectronic amplifier circuit.

It is also possible that the control of the nipper is taken over by a computer. The equations (2a), (2b) are evaluated directly and issued by the computer corresponding control commands to the drive. For this purpose the viscosity, the target quantity and the basis weight have to be specified; The computer takes over the further steps.

With the method according to the invention, it is possible to meet the object mentioned above.

According to the invention, this object is achieved by first determining the viscosity Z of the liquor (if not already known). Subsequently, the non-linearly variable amounts of the quantities Q ₀ , m, k, a are determined from present calculated diagrams, and then the peripheral speed V of the plucking roller can be calculated from the above formulas and the drive control of the plucking roller can be entered a value, after which the circumferential speeds of the plucking roller in FIG Depends on the rate of goods according to the equations (2 a) and (2 b) according to a certain non-linear characteristic controls.

embodiments

The invention will be explained in more detail with reference to a drawing, without limiting the generality. From the Fig. It can be seen that a web 1 runs over the nip roller 2 and is loaded according to the peripheral speed of the nip roller 2 with the fleet from the trough 3. The Flottennachschgb in Fleetentrog 3 via a level control, consisting of the level sensor 4, the level controller 5 and the valve 6. At the padder 7, the speed of the web 1 is measured by the tachogenerator 8 and entered as a reference variable in the control unit 9. Likewise, the technological parameters basis weight and liquor viscosity are entered into the control unit 9. This control unit 9 then supplies the desired value for the drive controller 10. The combination drive controller 10, drive motor 11, feed roller 2 and tachogenerator 12 forms a control loop for itself, which realizes the speed of the feed roller predetermined by the control unit 9.

Thus, it is not necessary to measure the subsidized or applied liquor quantity or to check the weight of the goods.

Documents considered:

CH-PS 535074 (B 05 c, 1/08)

Claims (1)

A method for controlling the peat application of aqueous solutions of chemical products to textile fabrics, characterized in that the liquor order is automatically controlled according to a defined context involving the parameters viscosity of the liquor, target amount and basis weight without the basis weight of textlien fabric and / or the subsidized or applied liquor quantity is measured. For this 1 page drawing