1. Pre Spinning Processes
(YM-2012)
M Irfan
Department of Textile Engineering
National Textile University Faisalabad
Reference:
The Rieter Manual of Spinning

2. Feed to the card
• Features
• Feeding to the card must be uniform
• Sliver is first intermediate product during yarn manufacturing
• Any irregularity (thick thin places) in the sliver will be transmitted to the yarn in elongated
form
• Even and uniform sliver is not possible without even feed to the card
• Homogeneous feed from card to card
• Constant feed over longer time periods
M Irfan, PhD

3. Feed to the card
• Types of card feed
• Older method
• Lap feed via scutcher
• Scutcher forms uniform
lap as quality of lap is
controlled
• Modern method
• Tuft feed via chute feed
system
M Irfan, PhD

4. Feed to the card
• In case of lap feeding, good feeding should have
following features
• Easy and correct unwinding of lap
• Lap roller surface should be in good condition
• Surface condition of feed plate should also be good
• Provision of putting an extra lap in the feed region
• There should be appropriate tension draft between lap
roller and feed roller
M Irfan, PhD

5. Feed to the card
• Pros of lap feeding
• Controlling the evenness of laps is easy
• Excess production can be stored in the form of laps which are compact
• Transport cost of lap is less than chute feed system or flock feed
• Cons of lap feeding
• More manual efforts in lap transport and lap change on card
• Possibility of uneven feed to the card when one lap is finished and new one is
installed
• During lap change, clean waste can increase
• Laps are more compressed than batt in chute feed system hence more burden on
taker-in
• Lap may contain more dust particles than flock feeding
M Irfan, PhD

6. Feed to the card
• Chute feed system should have following features
• In case of chute feed system, one card is close to the fan of distribution system while
others are at increasing distances
• To ensure homogeneous feed to all cards, the batt in each chute should be even
• Equal thickness
• Equal density
M Irfan, PhD
• Even distribution of the material over entire
width
• Modern high performance cards have high
production rates which require greater feeding
and loading of card clothing, thus finely
opened material should be fed to reduce the
burden of card clothing

7. M Irfan, PhD
Chute feed system to the card
Two piece system
One piece system

8. Feed to the card
• Types of chute feed system
• One piece chute
• Without any opening system
• It consists of single vertical chamber which feed material to the feed roller
• This system is simple and economical and requires less maintenance
• Two piece chute
• With an opening system
• It consists of two part
• One upper reserve chamber which receives material from the blowroom and separates air
from material
• Lower chamber is separated from upper one by an opening roller
• Material is lightly compressed by compressed air or vibrating plate and a uniform batt is
formed
• This compression should be stopped when card is not in working otherwise uneven sliver
may form due to over compaction
M Irfan, PhD

9. Feed to the card
• Feed roller seals the upper half of the chute and
feeds the fiber to the opening roller in
combination with feed trough
• Compressed air from a fan makes the batt
compact with metered supply of air which flows
back to the fan
• An electronic pressure switch controls the
density of the material and filling of the lower
part
M Irfan, PhD

10. • DIRECTFEED by Trutzschler
M Irfan, PhD

11. Fine cleaning in the chute system
• For fine cleaning mot knife is provided with the opening roller
• Mot knife removes impurities from the raw material after
opening
• This turns card feed to a fine cleaning unit
• Burden of blowroom is shared by several cards
• Gentle cleaning compared with blowroom as production rate
is very low in chute
• Yarn quality is improved
• Imperfections are reduced
• Short fiber content also improves
• Flow of controlled air condense fiber into homogeneous batt
M Irfan, PhD

12. Feed to the card
• The distribution system that delivers
material from blowroom to the card can be
of two types
• Open distribution system
• The duct of this system terminates at the
last card
• Closed distribution system
• It is in circular form which delivers the
excess fiber flocks back to the distribution
system
• These flocks are not taken by any card
• Neps can form if too much material is
present in ducts
M Irfan, PhD