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Ensuring quality through product inspection essential – GNBS

Mar 09, 2013 News

Through routine inspection practices, manufacturing companies worldwide are managing to control the quality of their products offered to their customers, according to the Guyana National Bureau of Standards (GNBS).
The bureau noted that by “inspection” it is usually meant that at certain stages in the course of production, a comparison is made between what has actually been produced and what should have been produced.
It was explained that the standard of reference may be a specification, drawing or a visual quality standard. The check made must be appropriate to the job and must be made with suitable measuring instruments.
Inspectors, the GNBS noted should not waste time checking things that do not matter or fail to do a check that is important. Things that are unlikely to go wrong need little checking and those that are difficult to hold within limits will need a considerable amount of attention.
Adding that it’s a misconception that the Inspector alone is responsible for quality, GNBS underscored that quality results from a combination of the quality of the original designs, the methods used, equipment and materials used along with the skill and care of the operator. In spite of these, if the job is still wrong, no amount of inspection will put it right.
According to production flow, the inspection may be divided into incoming inspection, in-process inspection and final inspection. Incoming inspection concerns goods upon delivery from vendors and/or suppliers. It consists of inspection of raw materials, components and sub-assemblies. The aim of incoming inspection is to prevent goods that do not fulfill the quality requirements from entering the production process.
In-process inspection aims to prevent products of unacceptable quality from being manufactured. It provides data for making decisions on the product (accept or rework or reject), as well as on the process (run or stop).
It was further noted that the final inspection and testing is done after manufacture has been completed, with the object of making sure that the goods concerned are satisfactory for dispatch to the customer or maybe to another department for the next operation.
Based on the product specifications, inspection instructions are prepared that lay down the details of the tests to be carried out, the measuring instruments or test equipment to be used and the criteria for deciding acceptance of the product with respect to each characteristic. Inspection instructions should also include details of the sampling plan such as size of sample and the criteria of acceptance to be followed. Measuring instruments or test equipment used for inspection should be calibrated periodically to verify their accuracy.
“It is necessary to exercise suitable control over the movement of the product through the inspection area in order to avoid a mix-up of accepted and rejected products. Ways to exercise such control include: Provision of clear labels (preferably of different colours) for products awaiting inspection, accepted products, rejected products, products on hold awaiting the results of tests and/or inspection and so on; Separation of accepted and rejected products; Review of rejected products for rectification or repair or for sale as seconds; The accepted product should only be released to the next process or to the customer by a person who is authorized to do so,” the GNBS noted.

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