SOP for Disperse Printing on 100% Micro Polyester Knitted Fabric

Quality Control Checklist: Disperse Printing on 100% Micro Polyester Knitted Fabric

Standard Operating Procedure (SOP) & Quality Assurance Checklist for Rotary Screen Printing, Continuous Loop Steamer Fixation, and Washing/Reduction Clearing Processes.

1. Job & Batch Identification

Job / Order Reference	[Job #]	Date & Shift	[DD/MM/YYYY - Shift]
Fabric Specifications	100% Micro Polyester Knitted	GSM / Width	[GSM] gsm / [Width] inches
Design / Pattern Name	[Pattern Name / #]	Operator / Supervisor	[Operator Name]

2. Pre-Printing Inspection & Machine Setup

Checkpoint Item	Standard Specification	Actual Reading	Status (Pass/Fail)
Fabric Pre-Treatment & Heat Setting	Fully relaxed, preset at 180 to 190 deg C GSM, zero creasing	[Verified]	[Pass/Fail]
Fabric Tension & Unwinding Unit	Minimum tension control for knitted fabric	[Reading]	[Pass/Fail]
Blanket Gumming & Tackiness	Thermoplastic / Water-soluble glue uniform coat	[Checked]	[Pass/Fail]
Disperse Print Paste pH & Viscosity	pH 5.0 - 5.5 (Acidic) / Viscosity: 60-80 dPa.s	pH: [ ] | Visc: [ ]	[Pass/Fail]

3. Rotary Machine Operating Parameters

penetration.

4. Loop Steamer / Fixation Settings

Loop Steaming Parameter	Standard Specification	Set Value	Status
Steaming Type	Superheated Steam (HT Steaming)	HT Steam	[Pass]
Steaming Temperature	170°C - 175°C	[ ] °C	[Pass/Fail]
Fixation Time (Dwell Time)	7 - 9 minutes	[ ] mins	[Pass/Fail]
Loop Length & Tension Control	Tensionless loop formation; no fabric contact	[Verified]	[Pass/Fail]
Humidity Level	Slight moisture injection to avoid fabric harshness	[ ] %	[Pass/Fail]

5. Continuous Washing & Reduction Clearing (RC) Settings

To ensure maximum color fastness, soft handling, and zero staining on micro polyester knit fabric, adhere strictly to the bath Sequence:

sequence:

6. Post-Processing & Quality Audit

• Color Fastness to Washing & Rubbing: Perform fastness test (Target: Dry Rub Grade 4-5, Wet Rub Grade 4).

• Fabric Handle & Elasticity: Ensure no stiffness or loss of stretch elasticity in micro polyester knit.

• Dimensions & Shrinkage: Verify stenter drying temperature (<150°C) to prevent thermal yellowing or skewness.

• Defect Check: Check for screen joint marks, dye specks, squeegee lines, or bleeding.

7. Sign-off & Quality Authorization

Printing Machine Operator Signature: ___________________________	Steamer & Washing In-Charge Signature: ___________________________
QA / QC Manager Signature: ___________________________	Date & Final Approval: ___________________________