Quality control | Objects of quality control | Types of quality control | Quality characteristics

Quality: The whole of specific property and performance to be the object of a valuation for determining whether a service is satisfying its purchaser.

Quality control: It is an integrated system that permits economical production and supply of products to meet the requirements of users.

Objects of quality control-

1. To produce a standard of product that is satisfactorily accepted by the purchaser.
2. During production, the deviations of the quality parameters are analyzed to find out the causes of deviation.
3. The corrective action should be taken if the product does not possess the demand.
4. Purchaser demand should be targeted.
5. Producing and offering the product at minimal manufacturing cost

Quality characteristics-

1. Raw cotton: suitable length, fineness, strength and twisting capacity, etc.
2. Yarn: count, strength, TPI, evenness, [U%, C.V%, imperfection (thick places/1000m + thin places/1000m+ neps/1000m)], hairiness, etc.
3. Fabric: dimension (length+ width+ thickness), density (EPI+PPI), strength, GSM, dimensional stability, fastness, abrasion and pilling, spirality, etc.
4. Garments: size, style, color, comfortness, hygienic condition, ironing, packaging, labeling, etc.

Types of quality control-

1. Online quality control
2. Off line quality control

Online quality control: Without stopping the m/c or process quality of any product is maintained. e.g.:

1. Sliver and roving hank variation is controlled by auto leveller.
2. Yarn fault rectified by auto coner.
3. Yarn tension controlled by automatic tension compensating device shade variation by color dispenser.

Off-line quality control: Quality is controlled by stopping the m/c. e.g.: Count, TPI, CSP and Evenness (U%, C.V%, imperfection) test, etc.