How to Work with Yarn Examining Board?

Yarn Examining Board

Yarn Examining board is used for visual inspection of textile yarn like naps, thick and thin places.

Yarn Examining Board Specification

• Product Category: QC Yarn
• Machine Category: Yarn
• Product Name: Yarn examining board.
• Product Model:According to Manufacturer
• Product Class: New
• Origin: Made in China / America
• Brand/ Manufacturer: Name of Manufacturer
• Agent in Bangladesh: No/Yes
• Power:380v, AC220V±10%  50HZ.Power:55W
• Temperature:Normal
• Certification:SGS/Others
• Production Capacity:NA
• Density of reeling:7,9,11,15,20/cm 20/45mm
• Pressing by grade.,Seven yarn grade: 7,9,13,15,19/cm and GB/T399 standard density
• Rotate speed of show board:350r/min with staples speed adjustment

Yarn Mixing

• Average Micronaire of mixing should be same for entire lot & difference in average micronaire of different mixings of same lot should not be more than 0.1.
• The micronaire C.V% of a mixing should be less than 10%.
• The micronaire Range should be same.
• Cottons with two different origins should not be mixed.
• Cottons with too wide micronaire range should not be mixed.
• Cottons with too wide reflectance value (Rd) and Yellowness value (+b) should not be mixed.
• Immature fibre content should be lowest as it affects dyeing & results in white-specks.
• If automatic bale openers are used, bale lay downs should be done properly, so that different micronaire bales & colours are getting mixed up homogeneously even if small quantity is being checked.
• If manual mixing is carried out, bales should be arranged & mixed properly so that different micronaire bales & colours are getting mixed up homogeneously even if small quantity is being checked.
• For manual mixing, tuft size should be as low as 10gm.
• If contaminated cottons are used, the best way is to open bales into small tufts & segregate contaminants. There are mills that employ around 60-80 persons to pick up contamination from a mixing of 20tons.
• Japanese insist on mixing at least 36 bales for one mixing to avoid Barre problem.

Fabric Inspection

Number of inspection tables: 02

Number of operators on each inspection table

(For Loading/Checking/Unloading):02

Light levels for Fabric Inspection machine

Exmaple	Exmaple 1
Present	Standard	Present	Standard
800-1000	750-1000	850-1000	750-1000
lux	lux	lux	Lux

Inspection Equipment

The fabric examining machine with variable speed control, overhead light (daylight bulbs) and yardage counter. The machine must be clean with no oil and sharp edges to damage the fabric.

How much fabric to inspect

The garment making factory should inspect 10% of rolls from each delivery at random this should include all colors and dyelots within a delivery. If the results show a high fault rate, then an additional 15% rolls should be inspected. If these fail, the delivery is either rejected or 100% inspected.

Procedure

At the beginning of each roll, a 6” full cutting should be taken as a color reference and checked for side-to-side and side-to-center shading.

This is labeled with fabric reference number or name, batch number, piece number, color number, color name and date.

Width of the fabric between the stenter pins must be measured and compared with the given minimum usable width.

Each roll checked must be stopped at least 3 times during inspection (beginning, middle, end). At these points, side-to-side and side-to-center shading should be assessed.

Side-to-end shading must be checked by comparing the full width cutting to a point in the roll. Also the cutable width (between the stenter pins) should be measured.

The cutable width should be recorded on the inspection report, as should any color shading detected.

Check the fabric length stated on piece ticket against the actual length of roll for variance. Record both the values.

Allotment of points on 4-point system

Flaws	Points given
Up to 3″	1
3″-6″	2
6″-9″	3
More than 9″	4

Points/yards²=Actual points counted x     36”      x 100

Actual roll length       Actual width

Common Defects in various points scheme

1 Point	2 Point	3 Point	4 Point
Foreign Yarn	Weaving faults	Weft Bar	Thick Yarn
Slub	Foreign Yarn	Thick Yarn	Hole
Spot	Thick Yarn	Weaving Fault	Shade Bar
Weaving Fault	Missing Yarn		Missing Bar
Dyeing Effect	Shade Bar		Missing Yarn
Naps	Thick Yarn

Apart from these defects, the fabric is also tested for shrinkage, color fastness, and the shade variation (through light box), within a roll and between two rolls.

Fabric:

1. Are all colours affected? If not which ones are?
2. How many points did the 4pt. inspection come up to?
3. Is/are the sample(s) sent representing the:
– worst
– average
– best
4. Is/are the cutting(s) sent taken from the:
– beginning
– middle
– end
of the roll ?
5. Are all rolls or what batches are affected?
6. Is every yard affected or how often do they repeat?
7. Are the faults of this cutting typical for size & severity?
8. Based on your experience do you think the fabric is cuttable?
9. Please advise estimated loss (e.g. in percent).

In case of fabric faults please cut & send 1yd (not from the first 5yds) of 10% of the rolls but no more than 7.
In case of shading please cut & send 20cm x full width (not from the first 5yds) of every roll.
Garments:
1. Are all colours affected?
2. Is the shirt from bulk production?
3. Is it representing the:
– worst
– average
– best
of production ?
4. How many shirts are affected (e.g. percent)?
5. Can these faults be avoided on collar, cuff & A zone?
6. In case of shading is this caused by:
– roll to roll shading and therefore mix of panels
– shading within the same roll
– shading of interlining

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