Quality Control Function of Textile Materials-
Test Properties of Yarn
1:- If routine checks are carried out on yarn choose a delivery of average Tex (count, denier).
2:-If incoming yarn is not checked then check the Tex (count, denier) of the delivery intended for samples and only use if it is within acceptable limits.
3:-Carry out other appropriate tests on yarn e.g. crimp nylon-Crimp Rigidity test. Knit a small sample and check that dye is fast to light, washing and perspiration etc.
4:-Record details of yarn type, supplier, Tex (denier, count) etc. and pass information to knitting room.
1:- Record all details required to produce the fabric or garment blanks including chain set out, stitch length and any instrument measurements.
2:- Record all details of making the trimmings.
3:- Note any difficulties encountered e.g. stitch pattern causing occasional drop stitches. Pass information to making-up room.
- Record all details of making-up, including the type and count of the sewing thread, and the order of seaming the parts.
- Note any difficulties encountered e.g. difficult operation to attach collar.
Test for Physical Properties of Garments-
- Record the dimensions of the garment as soon as it is completed.
- For a fiber of high moisture regain find the weight in correct condition.
- Wash garment and recheck the measurements.
Liaison of Quality Control with Cost Department-
- On completion, supply cost department with all information.
- For the correct Tex (count, denier) of yarn, costing may be made directly on sample. For a count which is above or below the average (although within an acceptable tolerance) make an appropriate adjustment to yarn costs and weight.
- Make an allowance for any anticipated extra difficulties, or a higher than normal rate of seconds.
- Subsequent Alteration
- Make any necessary alterations required by firm or by buyers.
- Record changes at each stage.
Analysis of Results of Quality Control Checks-
We have to analyse the obtained results to fix the appropriate quality. To get that assurance we must compare-
- Present results with earlier ones in the one set of results.
- Different materials on same machines with the same operatives.
- Different machines using same materials with same operatives.
- Different operatives using same type of machine and same materials.
- Results with outside sources to confirm or modify standards.
Quality Control in the Design and Development Department-
The following rules should followed by the Design and Development Department to control the quality of the product.
- If disorganization in sampling is to be avoided guideline procedure must be established beforehand.
- Modifications to the development sample must be noted for inclusion in the final specification.
- A handle sample (sealed if necessary) must be established as well as a working sample.
- A proper flow diagram must be established with appropriate time factors, and all personnel concerned informed of the duty and timing of their part.
Q.C. can be involved in development at an earlier stage by sampling new yarns. In combination with wearer trials and laboratory tests, assessments of seasonal and other goods can be made.