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Tekstil Teknik October 2020

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İNCELEME

35

Şekil 1: Fig. 1:

In the late 80’s and beginning 90’s, the maximum

add-on in textile impregnating systems

for bleaching and scouring starts one´s triumph.

A variety of different systems were offered

by the textile manufactures. Typical of those

units was a high add-on off more than 100%

combined with a low volume of the impregnating

unit. All these units were dosing in [ml/

kg] but using different systems for applying the

wanted chemicals on the fabric.

An example of some of those units is visible

in Fig. 1. Please note that the depictured

sketches are not at all copies of existing units,

they are just imitating some working principles.

(Fig. 1)

To understand the working principles and the

impact on the processed fabric we have to

focus on 2 items, the mechanical set-up of

the unit and the dosing method used for the

impregnating unit.

Both points are completely separated and do

not intermingle. The mechanical set-up will

be responsible for all parameters once a unit

is in equilibrium, whereas the dosing should

be evaluated more in view of reliability and a

correct and easy handling.

The mechanical set-up of an impregnating unit

Strictly considered we can reduce an impregnating

system in a simple drawing as shown

in fig 2 where 4 parameters are defining

everything what is happening in an impregnating

system. The properties of the fabric (at

a defined speed, temperature and recipe)

together with the water squeezer (Q1) and

the construction of the impregnating part will

define the exchange. The chemical squeezer

(Q2) will define the amount of liquid on the

fabric. (Fig 2)

Measuring the parameter involved (chapter 3)

and applying them in the formulas given in this

paper will give a detailed view of what is physically

happening in an impregnating system.

Most of the abbreviations used in here are the

following:

m in [kg/min] amount of fabric

passing per minute (speed*weight)

t in [min] time

Şekil 2: Fig. 2:

Kumaş Üzerindeki Flote Miktarı

∆Q in [l/kg] Uygulama Farkı (Q2-Q1)

f

Değişim faktörü, 0,0 ile 1,0 arasında

sayısal bir değer olarak emprenye sırasında

emprenye flotesi tarafından değiştirilen su

miktarı

V in [l] Emprenye ünitesinin hacmi, karıştırma

kabı ve borular dahil toplam flote miktarı.

Epu in [l/kg] Efektif Pick-Up (Epu =Q1*f+∆Q ->

∆Q=Q2-Q1)

Ct in [ml/l] Bir t zamanında emprenye ünitesindeki

konsantrasyon

C∞ in [ml/l] Kimyasal Dengede Emprenye

Ünitesindeki Konsantrasyon (Zaman t=∞)

C0 in [ml/l] Yeni bir üretime başlanması

veya kumaş değişimi gibi t=0 başlangıç anında

Emprenyedeki Konsantrasyon

CF in [ml/l] Besleme Flotesinin Konsantrasyonu.

(CF, emprenye ünitesine giden su ve

kimyasalların toplamının konsantrasyonudur.

Besleme Flotesinin miktarıyla karıştırmamalı

çünkü Besleme Flotesi Miktarı kumaş üzerine

verilen ilave flote (add-on) ile aynı anlamdadır.

Sıkma değerleri, sırasıyla flotenin kumaş üzerine

uygulama miktarlarını [l/kg] birimiyle ifade

ederler. Sıkma değeri için kullanılan ortak terim

%’dir, ancak bu makalede kullanılan formüllerde

olası yanlış anlamaların önüne geçmek

için [l/kg] birimini de kullanmamız gerekecektir.

TEKSTİL & TEKNİK | EKİM | OCTOBER | 2020

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