Scribd
Upload
562 views14 pages

Blowroom Calculation

The document discusses parameters to consider when calculating blowroom processes, including the number of opening machines, beater type and speed, and production rates. It explains that cleaning efficiency is measured as the ratio of trash removed to total trash fed. Higher cleaning can be achieved through optimizing cleaning intensity and waste amounts based on the raw material and desired end product. Diagrams illustrate relationships between cleaning intensity, waste amounts, and settings for different material types and recycling processes. Formulas are provided for determining waste amounts based on production rates and stop/go ratios over test periods.

Uploaded by

Irfan Ali
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPSX, PDF, TXT or read online on Scribd
562 views14 pages

Blowroom Calculation

The document discusses parameters to consider when calculating blowroom processes, including the number of opening machines, beater type and speed, and production rates. It explains that cleaning efficiency is measured as the ratio of trash removed to total trash fed. Higher cleaning can be achieved through optimizing cleaning intensity and waste amounts based on the raw material and desired end product. Diagrams illustrate relationships between cleaning intensity, waste amounts, and settings for different material types and recycling processes. Formulas are provided for determining waste amounts based on production rates and stop/go ratios over test periods.

Uploaded by

Irfan Ali
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPSX, PDF, TXT or read online on Scribd
You are on page 1/ 14

Blowroom Calculation

Blowroom Calculation

Prof. Dr. Rafique Ahmed Jhatial 1


CLEANING EFFICIENCY
 Cleaningefficiency of the machine is the ratio of the trash removed
by the machine to that of total trash fed to the machine, expressed as

Or

Following are the basic parameters to be considered in Blowroom


process.

 no of opening machines
 type of beater
 type of beating
 Beater speed
2
CLEANING EFFICIENCY
 setting between feed roller and beater
 production rate of individual machine
 production rate of the entire line
 thickness of the feed web
 density of the feed web
 fibre micronaire
 size of the flocks in the feed
 type of clothing of the beater
 point density of clothing
 type of grid and grid settings
 air flow through the grid
 position of the machine in the sequence
 amount of trash in the material
 type of trash in the material
 temp and relative humidity in the blow room department
3
Cleaning Intensity

4
A higher degree of cleaning efficiency can be

achieved by utilizing the synergistic effect of

cleaning intensity and amount of waste. The

raw material (trash content, ease of cleaning)

and the end product (yarn) are the decisive

factors.

5
Explanation of diagram «Cleaning intensity»

6
Explanation of diagram «Relative amount of waste»
Case A:
Only raw cotton is processed in this facility. The waste produced is
not treated in the same mill (e.g. it is sold). In an attempt to keep
fibre loss to a minimum, the amount of waste is kept low.
Nevertheless, the cleaning effect must not be neglected.
Example:
Trash content = 3% / Setting = 2

Case B:
In this case, there are two blow-room lines, «X» and «Y». No
recycling material is mixed into line «X». The waste from line «X»
is fed in-house to line «Y». As there is no actual loss, the relative
amount of waste can be greater.
Example:
Trash content = 3% / Setting = 4

7
Explanation of diagram «Relative amount of waste»

Case C:
In blow-room line «Y», recycling material is mixed in the
raw cotton. This alone will raise the trash content. The
relative amount of waste must be set higher accordingly.

Example:
Trash content = 5% / Setting = 8

8
Explanation of diagram «Relative amount of waste»

9
Cleaning intensity and speeds

Programmed basic setting: 0.9

10
Relative amount of waste

Programmed basic setting: 5

11
Determining the amount of waste
 Duration of the test:
Normally 3 times, at least half an hour.
For a provisional measurement of the waste, carry out one or more
complete UNIfloc passages.
Calculating the proportion of waste:

Production in kg:
(Actual production during test)

12
Stop / Go ratio:

 (Determine value over a period of at least one hour)

Or

13
 

or
 

or

14

You might also like