Air-Jet Picking Process and Components

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Questions and Answers

What is the primary function of the 2nd sensor (FD2) in the weaving mechanism?

To stop the machine if the weft yarn is present

To clean the profile reed and prevent yarn breakage

To stretch the filling yarn during shed closing

To ensure the absence of yarn and stop the machine if necessary (correct)

What is the purpose of stretch nozzles in the weaving process?

To create grooves for warp yarn travel

To ensure filling yarn remains stretched during shed closure (correct)

To mount the reed on the receiving side

To stop the machine when no yarn is present

What characteristic defines a profile reed in the weaving process?

It contains grooves to guide the filling yarn (correct)

It is used to feed warp yarn into the machine

It can be cleaned to enhance yarn tension

It holds the fabric during the weaving process

Which type of temples is suitable for heavy-weight fabrics?

Pin type temples Signup and view all the answers

Why is it essential to keep the reed properly cleaned in the weaving process?

To avoid breakage of warp and weft yarns Signup and view all the answers

What is the consequence of choking the jets of any sub-nozzle?

Breakage of weft and loose weft Signup and view all the answers

What function do solenoid valves serve in relation to the sub-nozzles?

They regulate the amount of air through electromagnetic function Signup and view all the answers

What are the two types of cutters mentioned in the content?

Electrical and mechanical cutters Signup and view all the answers

How many catch cords are typically present in the weaving machine?

8 - 12 Signup and view all the answers

What happens when the first weft sensor (FD1) detects the presence of weft yarn?

The machine resumes normal operation Signup and view all the answers

What is the primary role of the weft cutter?

To cut the weft yarn after insertion near the selvedge Signup and view all the answers

What type of cutters are operated with the help of an electric motor?

Electrical cutters Signup and view all the answers

What is the cutting position of the weft cutter set to leave on the selvedge?

5 - 10 mm Signup and view all the answers

What is the purpose of the Automatic Brake System (ABS) in a weaving mechanism?

It detects yarn supply and stops the loom when the yarn breaks. Signup and view all the answers

What happens if the main nozzle is not properly aligned?

It causes weft breakage. Signup and view all the answers

How are the tandom nozzles and main nozzles related?

The number of tandom nozzles equals the number of main nozzles. Signup and view all the answers

What role do relay nozzles (sub-nozzles) play in the weaving process?

They assist the main nozzle in blowing the pick through the guide channel. Signup and view all the answers

What is a significant feature of the arrangement of sub-nozzles?

They are divided into groups and operate at intervals. Signup and view all the answers

What dictates the distance between sub-nozzles in relation to yarn count?

The count of the weft yarn. Signup and view all the answers

What is the primary function of the tandom nozzle during the weaving process?

To blow the weft yarn during pick insertion. Signup and view all the answers

How does the solenoid valve contribute to the operation of sub-nozzles?

It supplies air pressure to operate multiple sub-nozzles. Signup and view all the answers

What is the primary function of the air-jet picking process?

To draw filling yarn from the supply package and insert it through the warp shed using air stream Signup and view all the answers

Which part is responsible for unwinding yarn from a supply package in the air-jet picking system?

Supply Package Signup and view all the answers

What role does the disc tensioner play in the air-jet picking mechanism?

It provides necessary tension to yarn during unwinding Signup and view all the answers

What is indicated by the blinking red light on the magnetic pin assembly?

Winding process is ongoing on the pre-winder dial Signup and view all the answers

How many picks of yarn are typically stored on the pre-winder dial?

2 - 3 picks Signup and view all the answers

Which part is NOT mentioned as a component of the air-jet picking system?

Warp Beam Signup and view all the answers

What happens to the pre-winder when the number of windings on the dial is reduced to a set level?

It starts the winding process again Signup and view all the answers

What is the maximum weight of a filament yarn package in the air-jet picking system?

8 - 10 lbs Signup and view all the answers

Study Notes

Air-Jet Picking Definition

Air-jet picking is the process of drawing filling yarn from a supply package and inserting the yarn through the warp shed using an air stream.

Air-Jet Picking Major Parts

Supply Package:
- Can be cone or cheese shaped.
- Yarn is unwound.
- Weight varies depending on yarn type and count (2.5-10 lbs).
Cone Stand:
- Holds cones to feed yarn to the pre-winder.
- Cones are mounted on rubber pegs.
- A disc tensioner provides yarn tension during unwinding.
- Disc tensioner guides yarn.
Pre-winder/Weft Accumulator/Weft Feeder:
- Feeds yarn to the main nozzle.
- A magnetic pin detects the number of windings on the pre-winder dial.
- Yarn is wound onto the pre-winder dial.
- 2-3 picks of yarn are typically stored on the dial.
- Winding numbers/pick length influence dial adjustments.
- A nut adjusts dial diameter.
- Red light on magnetic pin assembly blinks during winding.
ABS (Automatic Brake System):
- Ensures continuous weft yarn supply to the main nozzle.
- Vibrates to detect yarn supply.
- Stops the loom if yarn breaks.
- Smooths yarn supply.
Main Nozzle/Fixed Nozzle:
- Feeds yarn to movable nozzle.
- Number of nozzles depends on pre-winders used.
- Proper alignment is important to avoid breakage.
Tandom Nozzle/Movable Nozzle:
- Blows weft yarn during pick insertion.
- Passes yarn to sub-nozzles.
- Number of tandem nozzles matches pre-winders.
- Fixed on the sley and moves with reed.
- Distance from weft cutter must be sufficient to avoid striking.
- Number of main and tandem nozzles always matches.
Relay Nozzles (Sub-nozzles):
- Fitted on the sley.
- Arranged across the reed.
- Assist the main nozzle in blowing pick through the guide channel.
- Divided into groups of 5 sub-nozzles, working in intervals.
- Solenoid valves supply air pressure to sub-nozzles.
- Air pressure increases from left to right in sub-nozzles.
- Distance between nozzles depends on weft yarn count.
- Drop in pressure between nozzles is compensated by nozzle spacing.
Solenoid Valve:
- Connects to relay nozzle and air tank.
- Regulates air by electromagnetic function.
- One valve operates 2-5 sub-nozzles.
- Main nozzle has its own solenoid valve.
Cutters:
- Two cutters: one on picking side (weft cutter) and one on receiving side (leno cutter/waste cutter).
- Weft cutter cuts weft yarn near the selvage.
- Leno cutter separates leno waste.
- Cutting position and degree are important parameters.
Catch Cords:
- Synthetic yarns.
- Grip weft waste on receiving side.
- 8-12 catch cords are common.
- Independent shedding.
Weft Sensors (FD1, FD2):
- Two sensors on receiving side, 120-130mm apart.
- Sense arrival of weft yarn.
- FD1 ensures presence; FD2 ensures absence.
- Machine stops if yarn is absent.
Stretch Nozzles:
- Stretch filling yarn during shed closing.
- Mounted on receiving side.
Profile Reed:
- Reed with grooves (profile).
- Directs filling yarn path.
- Avoids warp yarn interference.
- Cleaned to prevent warp/weft breakage.
Temples:
- Hold and stretch fabric during formation.
- Different types (ring, pin) for different fabric weights.
- Used on both fabric sides.

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Description

This quiz explores the air-jet picking process, including its definition and the major parts involved such as the supply package, cone stand, and pre-winder. Understand how air streams facilitate yarn insertion and the mechanics of the equipment used. Test your knowledge on this essential textile manufacturing method.