QC in Knitted ProductionQC in Knitted ProductionPart 3: Output ControlPart 3: Output Control

Jimmy LamJimmy Lam

Institute of Textiles & ClothingInstitute of Textiles & Clothing

Learning ObjectivesLearning Objectives

What are the output control for the knitted What are the output control for the knitted fabric production?fabric production?

Is it important and why?Is it important and why?

Remember this modelRemember this model

PROCESS

INPUT OUTPUT

CONTROL

What are the major control elements for output control

Closed-loop Control ModelClosed-loop Control ModelQuality Control ProcessQuality Control Process

KNITTING

YARN FABRIC

INSPECTION

Output ControlOutput Control

This is the final stage of manufacturing This is the final stage of manufacturing and is concerned with fabric inspection and is concerned with fabric inspection and fabric physical and chemical testing.and fabric physical and chemical testing.

Fabric QualityFabric Quality

Fabric WeightFabric Weight– It is affected by yarn count, loop length and fabric It is affected by yarn count, loop length and fabric

structure. Fabric weight is concerning with costs structure. Fabric weight is concerning with costs and performanceand performance

Fabric thicknessFabric thickness– It is affected by yarn count, dial height, finishing It is affected by yarn count, dial height, finishing

and fabric structure. Fabric thickness is due with and fabric structure. Fabric thickness is due with comfortcomfort

Fabric QualityFabric Quality

Fabric WidthFabric Width– It is affected by loop length, finishing and fabric It is affected by loop length, finishing and fabric

structure (stentering). Fabric weight is concerning structure (stentering). Fabric weight is concerning with material utilization in garment cuttingwith material utilization in garment cutting

Colour fastness to washingColour fastness to washing– It is affected by quality of dyes and finishing It is affected by quality of dyes and finishing

techniques and is concerned with aesthetic of garmenttechniques and is concerned with aesthetic of garment

Fabric QualityFabric Quality

Washing ShrinkageWashing Shrinkage– It is affected by material used, loop length and type of It is affected by material used, loop length and type of

finishing. It is concerning aesthetic of garmentfinishing. It is concerning aesthetic of garment Felting ShrinkageFelting Shrinkage

– It is important on sweater that made of wool, angora or It is important on sweater that made of wool, angora or cashmere fibrescashmere fibres

Fabric distortionFabric distortion– It is affected by tightness factor and fabric structure and It is affected by tightness factor and fabric structure and

is concerned with the comfort of knitted garmentis concerned with the comfort of knitted garment

Fabric QualityFabric Quality

Seam slippageSeam slippage– Important for knitted apparel goods and is affected Important for knitted apparel goods and is affected

by seam density and fabric structureby seam density and fabric structure Seam strengthSeam strength

– Important for knitted apparel goods and is affected Important for knitted apparel goods and is affected by thread strength, stitch density and type of seam. by thread strength, stitch density and type of seam. It concerns with quality and durability of garmentIt concerns with quality and durability of garment

DiscussionDiscussion Fabric inspection is the last stage in our control Fabric inspection is the last stage in our control

process, discuss why it is important ?process, discuss why it is important ? What possible action can we do if we discovery What possible action can we do if we discovery

the fabric is suffered with “inferior quality” the fabric is suffered with “inferior quality” during the final control process ?during the final control process ?