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Process flowcharts

Waffle and thermal knit dyeing and finishing: flowcharts for cotton, CVC and Lycra waffle

Waffle and thermal knit dyeing and finishing flowcharts for cotton, CVC/PC and Lycra: singeing instead of enzyme, GSM after wash, shrinkage, and data from 275 parts.

Waffle and thermal knit dyeing and finishing: flowcharts for cotton, CVC and Lycra waffle

Waffle is a texture fabric: its square cells are what the buyer pays for, and it is one of the hardest fabrics to hold to GSM. Here is the route for each fibre, from greige waffle to the cutting table.

At a glance

275Parts in our records

250Median required GSM

32%Within GSM tolerance

39%Singed

Waffle (thermal) is a double knit with tuck and miss stitches that form a grid of square cells. The cells trap air, which is why it is used for thermal underwear and casual tops. The texture has to survive dyeing and finishing without being flattened or stretched out.

Type in our recordsParts
Waffle145
Ly Waffle40
L/Waffle23
Tuck Waffle11
Slub Waffle6
Mini Waffle5
Yd Waffle5
Micro Waffle5

By fibre: what our records show

Fibre or blendPartsMedian required GSMWithin ±5% GSMMore than 5% lightMedian length shrinkageMedian width shrinkageHeat set
100% cotton11728023%74%8%10%1%
CVC / PC10122045%42%4%4%84%
Cotton-elastane4128029%61%9%7%90%

Only 23% of cotton waffle finishes within GSM tolerance, and 39% of all waffle in our records was singed.

What makes waffle different

  • Waffle is a very loose knit, so its shrinkage is very bad.
  • Crease marks are normally not a big problem on waffle.
  • We cannot use enzyme on cotton waffle: it is loose, and the enzyme would cost bursting strength. When the buyer needs a clean surface, we singe it instead. That is why so much waffle is singed.
  • CVC or PC waffle takes the enzyme instead, because a polyester face cannot be singed.

Holding waffle GSM

  • Waffle GSM is hard to hold because it is a loose knit.
  • The most important thing is to wash it and check the GSM after washing. Without the wash you cannot see the real GSM, and you cannot control it.

The sequence before the dyeing machine

Every chart below follows the same sequence before dyeing. Steps a fabric does not need simply drop out; they are drawn dashed.

  1. Greige inspection, then batching. A fabric that stays a tube is turned inside out here.
  2. If it needs heat setting, singeing or mercerising: slitting first. None of these is ever done on a tube.
  3. If it needs heat setting: heat setting in open width.
  4. If it needs singeing: singeing in open width, after checking the flame cannot damage the fabric.
  5. If it is mercerised: mercerising, then drying.
  6. If the fabric was opened: back sewing, to make it a tube again with the face side inside (the loop side, for terry).
  7. Loading into the dyeing machine, then scouring, bleaching and dyeing, single part or double part as the fibre needs.

Flowcharts by fibre

100% cotton waffle and thermal knit

In our records: 117 parts, 23% within GSM tolerance, median length shrinkage 8%, heat set 1%. Full process: 100% cotton dyeing process.

Dyeing and finishing: 100% cotton waffle and thermal knit

Start: greige waffle and thermal knitfrom knitting
Greige inspectionholes, yarn faults, GSM
Batchingone lot per batch; turned inside out if it stays a tube
Slittingopen width: never heat set, singed or mercerised as a tube
Heat settingopen, 180–190°C; if heavy, tight, design or elastane
Singeingbuyer needs a clean face; used instead of enzyme on loose waffle
Mercerising & dryingon buyer requirement
Back sewinginto a tube, face side inside
Load in dyeing machine
Scour-bleach98°C × 60 min; heavy: 70–80°C
Reactive dyeing60°C
Wash-off & soaping
Fixing & softener
Slittingopen width
Stenterabout 150°C; width, GSM
Compactingshrinkage
Final inspectionGSM and shrinkage after wash, shade
End: finished rollto cutting
GreigePreparationDyeingAfter-treatmentFinishingOnly when needed
Flow chart: 100% cotton waffle and thermal knit, from greige fabric to the cutting table. Dashed steps run only when needed.

CVC / PC waffle and thermal knit

In our records: 101 parts, 45% within GSM tolerance, median length shrinkage 4%, heat set 84%. Full process: CVC / PC dyeing process.

Dyeing and finishing: CVC / PC waffle and thermal knit

Start: greige waffle and thermal knitfrom knitting
Greige inspectionholes, yarn faults, GSM
Batchingone lot per batch; turned inside out if it stays a tube
Slittingopen width: never heat set, singed or mercerised as a tube
Heat settingopen, 180–190°C; if PC, elastane, heavy, tight or design
Back sewinginto a tube, face side inside
Load in dyeing machine
Polyester dyeingdisperse, 130°C
Reduction clearing80°C × 10 min
Scouring98°C × 60 min
Enzymecotton part
Cotton dyeingreactive, 60°C
Soaping & softener
Slittingopen width
Stenter100–110°C when polyester is dyed
Compactingshrinkage
Final inspectionGSM and shrinkage after wash, shade
End: finished rollto cutting
GreigePreparationDyeingAfter-treatmentFinishingOnly when needed
Flow chart: CVC / PC waffle and thermal knit, from greige fabric to the cutting table. Dashed steps run only when needed.

Cotton-elastane waffle and thermal knit

In our records: 41 parts, 29% within GSM tolerance, median length shrinkage 9%, heat set 90%. Full process: Cotton-elastane dyeing process.

Dyeing and finishing: Cotton-elastane waffle and thermal knit

Start: greige waffle and thermal knitfrom knitting
Greige inspectionholes, yarn faults, GSM
Batchingone lot per batch; turned inside out if it stays a tube
Slittingopen width: never heat set, singed or mercerised as a tube
Heat settingopen, 180–190°C
Singeingopen width; when no enzyme can be used and a clean face is needed; never on polyester faces
Back sewinginto a tube, face side inside
Load in dyeing machine
Scour-bleach80°C × 50 min
Reactive dyeing60°C
Wash-off & soaping
Fixingdark shades
Slittingopen width
Stenterabout 150°C; width, GSM
Compactingshrinkage
Final inspectionGSM and shrinkage after wash, shade
End: finished rollto cutting
GreigePreparationDyeingAfter-treatmentFinishingOnly when needed
Flow chart: Cotton-elastane waffle and thermal knit, from greige fabric to the cutting table. Dashed steps run only when needed.

Common faults and buyer complaints

  • The main waffle fault is shrinkage. Shrinkage fails.

Shrinkage failure. Waffle is loose and keeps shrinking after finishing. Relax it fully in finishing, then test GSM and shrinkage after washing before delivery.

Kamrul Islam
Kamrul Islam

Textile engineer with 14+ years in dyeing and fabric development. He writes every guide on Dyeing Solution from real production work. Full profile