Quality assurance incoming materials

DSC is thus a quick and reliable method of analysis, not only in material development, but primarily in the areas of quality assurance, raw material control and failure analysis. DSC is used for identification of incoming plastic materials e.g. HDPE/PA6 and LDPE/EVAL/PA6 composite film. DSC can not only identify the major components of polymers, but can also detect minor components such as adhesives, if these have a melting behaviour which differs from that of the polymers. Quality control of packaging film without sample preparation is based on the measurement of the solid/liquid phase transition of melting by means of DSC. Sass [175] has given various examples of quality assurance and defect analysis of plastics by DSC. There is increased demand for sensitivity and capability because of the growing complexity of materials. 

Is there a procedure for quarantine of incoming material until approval for use is given by Quality Assurance ... 

Quality assurance is concerned with maintaining the quality of products to set standards. This embraces the control of incoming materials, the control of compounds produced, the control of manufacturing processes and guaranteeing as far as possible the quality of the final product. Quality assurance schemes utilise physical testing methods as a most important part of their system. In fact most of the standardised test methods are principally... 

As with the quality control plan for the formulator described above, acceptance tests on adhesives should be directed toward assurance that incoming materials are identical from lot to lot. However, this plan should also extend to the receipt and control of incoming adherends and other materials used in the bonding process. 

The objectives of this test pattern is to analytically resolve these problems into three manageable segments. The first task will be to define the viscoelastic kinetic properties of a material as a function of various reaction temperatures. These properties (viscosity, viscous modulus, elastic modulus, tan delta) define the rate of change in the polymers overall reaction "character" as it will relate to article flow consolidation, phase separation particle distribution, bond line thickness and gas-liquid transport mechanics. These are the properties primarily responsible for consistent production behavior and structural properties. This test is also utilized as a quality assurance technique for incoming materials. The reaction rates are an excellent screening criteria to ensure the polymer system is "behaviorally" identical to its predecessor. The second objective is to allow modeling for effects of process variables. This will allow the material to undergo environmental... 

Quality eontrol embraces the monitoring of incoming materials, the control of the manufacturing processes, and checks of materials and products produced, so as to ensure and maintain the quality of the output from the factory. Physical testing methods are important in this regime, and most of the standardized test methods are intended for quality eontrol use it is probable that the majority of tests carried out are undertaken in the first place for quality assurance purposes. However, this book is about testing and is not a quality eontrol manual, so discussion here is restricted to the quality control of the testing process. 

As the adhesives technology matured, specihcations were needed to assure the quality and properties of the incoming material and of the cured material. To this end, users and suppliers of adhesives, together with government agencies, collaborated in dehning the critical requirements, the tests to be performed, and the parameters that the material had... 

Spectral matching algorithms are also employed using multidimensional mathematics. Such techniques are often used in quality assurance programs where a spectrum of a known material is compared with incoming raw materials to check its purity or authenticity. For example, samples of orange juice concentrate were collected to represent the types available from two countries. In addition, samples that were known to be adulterated were obtained from one of the countries. All other samples were... 

Quality assurance. Thermosetting compoimd production uses comprehensive quality assurance programs to ensure that the customer receives products that meet their specific specifications, regardless of the process or equipment employed. Formulation and processing specifications require that the incoming raw materials meet specific quality standards and that the manufacturing processes be carefiilly monitored to make certain that the final compoimd meets a designated property profile. 

The end user s reasons for testing plastics are essentially twofold. The primary reason is to verify the quality of the incoming material to assure that it is within the specifications. The second reason is to validate the part design, which may involve testing the resin as well as the final part. 

Contractual agreements with major OEMs often require that the material under transaction meet the specifications set forth by the OEM for the incoming material, as part of the quality assurance effort. The resin supplier is required to demonstrate that the shipped material is within the specification. The testing involved is dependent on the OEM and targeted application, to provide proof of compliance. 

A flavor house must provide a good quality, consistent flavoring material for the consumer. It must also be certain that the flavor meets legal restrictions on ingredients and their qualities. The Quality Control/Assurance (QA) department meets these needs by performing both analytical tests and sensory evaluation on incoming ingredients and finished flavors. 

In product and process control quality assurance of polymeric materials cannot be imagined without thermal analysis [25], TA is widely used for automated batch analysis of incoming raw material in production laboratories [50] and for QC of engineering thermoplastics. Method development in-... 

The requirements for quality assurance are considered in the light of properties only being defined as components are manufactured. Checks on incoming materials, process control, destructive and non-destructive evaluation are discussed and for each stage the use of data is considered. 

Incoming adhesive material control includes two types of tests, physical properties, such as percent flow, gel time, and percent volatiles, which are of interest to the process engineer in assuring the quality of the bond. An example is the test for percent flow. This test is of value in maintaining the bonding process so that the adhesive flow is not be too high, which could cause an adhesive-starved bond. Too little flow, on the other hand, would cause a thick or inadequately filled bond [6]. Test methods used for physical properties include the following ... 

---