Purpose: The purpose of this study is to give an insight into the practices of Moroccan industrial companies in the area of managing quality costs. Furthermore, it analyses how the quality costing system (QCS) implementation and sophistication differentiate according to a number of variables (size, business market orientation, QMS Maturity...).Design/methodology/approach: In order to achieve this objective, a questionnaire survey has been conducted among a heterogeneous sample of 1000 industrial companies that are operating in the national territory yielding a response rate of 23.4%. This study uses exploratory and chi-square test in the process of answering the above-mentioned questions.Findings: The survey highlighted the limited use of quality costing practices among Moroccan industrial companies. Results indicated that 42.6% of surveyed companies are engaged in QCS while 63.4% of them do not. The primary barrier is the complexity of QCS implementation. Besides, findings pointed out that origin, business activity, business market orientation and QMS maturity level are prominent to QCS implementation (p<0.05).Originality/value: This is one of the first studies to provide an insight into practices of Moroccan industrial companies in the area of managing quality costs. Indeed, several studies were led in different countries but no empirical study has been conducted in Morocco. This will give a clear picture of the situation at the national level.Research limitations/implications: The major limitation of the study is the limited number of respondents. Future researches should be conducted to cover a bigger sample size from manufacturing and services sector as well.Practical implications: The findings provide an insight into the barriers to QCS implementation which can be used as basis to identify ways to overcome these difficulties, to develop guideline and reveal best practices in the implementation of COQ reporting system.
Unsaturated polyester resins (UPRs) are commonly used as matrix resins for fiber-reinforced composites. During processing, the resins undergo a molecular cross-linking process called curing, during which they change irreversibly from viscous liquids to rigid and highly cross-linked polymer solids. The gelation time is critical for the success of a resin system, but it is difficult to measure accurately. It depends on several parameters. In this study, the parameters investigated are the effect of choice and their relative proportions. Parameters such as catalyst, accelerators, inhibitor, and fillers were examined. Various combinations of catalyst, accelerator, inhibitor, temperature and filler were analyzed to investigate the effect on the gel time of the unsaturated polyester resins. Then, this review assembles the scientific data on the gelation of unsaturated polyester resins to help readers better understand this process. Students, researchers, technologists, engineers, and chemists involved in the technology of synthesizing these monomers and polymers will benefit from this material.
Results obtained showed that some essential manufacturing factors needs to be respected throughout the production loop. These factors will help obtaining a slurry exits with the desired chemical characteristics of P 2 O 5SE (33%), Al (10%), P 2 O 5SE + Citrate (34.5%), H 2 O (22%), P 2 O 5total (39%)). It is necessary to keep a temperature within 100 ± 5 ° C., with a vapor pressure of 6 to 7 bars, an average density of H 3 PO 4 (1470 g/l) and the solid rate in the feed acid less than 2%. After the reaction phase, the slurry is conveyed to the granulator where it is mixed with the recycled product at a recycling rate (RT) close to 3 and a K ratio between 0.1 and 0.2. This parameter is very important to be monitored to ensure a Good penetration of heat into the next phase in a relatively short time. During the drying process, the product humidity at the outlet must be in the range of 3.5% to 5% to allow the reaction to continue during the developing period. At the exit of the drying tube, the product is in very variable grains diameter (D), the objective of the following step is to extract the grain size range between 2 and 4 mm. To do so we changed the mesh size of the lower webs to 3/50 and 3.2 / 30 mm, which reduces the quantity of particle size less than 2%. Thus, the particles of diameter more than 3.15 mm must be continuously controlled to reach 64%. This portion will ensure conformity of the product for D 50 and for the two intervals [2-3.15 mm] and [3.15-4 mm]. In the Storage Hall the reaction continues, the unconverted phosphate will be attacked by the unreacted H 3 PO 4 , and according to a monitoring of the evolution of the chemical composition of the final product (TSP). The required ripening time is limited to 21 days. During this study, we were able to identify and modify a number of parameters in different production phases to improve the quality of TSP according to AFCOME, knowing that each phase of the process is a client of the previous phase and supplier of the next one.
The paper aims to evaluate the gel time and exotherm temperature properties of the curing of unsaturated polyester resin at various amounts of Methyl ethyl ketone peroxide, cobalt octoate and porcelain powder. The gel time of samples are determined using the simple method, while the exotherm temperature are evaluated using the thermocouple. The variation of these properties is discussed theoretically and experimentally.
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