![Assess quality level of the final product by using Demerit system: A case study in one industry of ..
2
control, and motivates employees to establish new ideasthat associatedwith improving the quality and reducing
the rates of defects in production.
This is research applied in the factory of transformers and household appliances of the general company
for electronic industries, because it produces a severaltypes of complex products. This offers the possibility to
apply the demerit system. Reflective product has been chosen to be the research sample.Thisresearch adoptedthe
case study method as being suitable to like this research. The data collected by using a several methods such as;
(1) personal observations (2) interviews with the director’s and staff, and (3) access to records and its formal
documents.The results enable the researchers to improve a rating system defects and assisted the factory area to
evaluate the level of the quality product.
III. Literature Review
A. QUALITY
The term of (Quality) is commonly used in the English Language. This term originally translated from
the Latin word (QUALITUS), which is also a translation of the Greek word (ποιοτεσ) discovered by Affiliation.
The meaning of quality has been changed over time, but still (good quality) means the reliability of products or
services according to the productivity requirement [1]. Garvin (1984) presented five basic entrances to quality.
These are as the following [2]:-
1) Entrance depends on use: Refers to quality according to this approach as the appropriate use of the product;
the reliability of products/services to perform their function according to the specifications accepted by
customer's satisfaction.
2)Entrance depends on the product: In this approach, quality refers to the accuracy and the ability to measure
the items or characteristics, which required in the product as customers wanted.
3)The entrance of excellence: The quality within this entrance in the product's ability to satisfy the customer
expectations. In this approach, the majority of organizations attempted to relevance between product
characteristics and customer expectations.
4)Entrance depends on manufacturing: refers that quality display according to entrance-making "defect-free
products", by adopting on comparison final product with design specifications required. This is consistent with
the concepts of quality in Japan.
5)Entrance depends on the value: This approach aims that quality considered through their relationship with the
price, as some of the customers may prefer the products that have a lower price compared with low specifications.
Juran and Godfrey (1999) argued that the quality term has several of meanings; but, in this research has
highlighted two of the most important meanings for the quality. These are as follows [3]:-
a)Quality is those characteristics of the products that satisfactory to the customer needs. In this research, the
quality directed to increase revenue. The purpose of providing the products or services within higher quality
levels is to increase the customer satisfaction, which leads in general to increase revenues.
b)Qualityis continuedact to remove the each of the defects and errors that need to extra work (re-work) in order to
achieve, that leads to resented customers. In this case, the quality focus directed to the costs, as the higher quality
means lower costs.
B. MEASURING (EVALUATION) PRODUCT QUALITY
The quality measure or evaluate are an important stage to achieve the quality of the product, because it
contributions the majority of an organization to control progress that leads to achieving the goals of quality
through the comparison between the actual performance and pre-defined goals [4]. The quality measurement is
the first step to adjusting and improving the quality through the availability of accurate data required to analyse
and solve the problems modify at the level of quality. Where, James Harrington the expert on the quality theme
said; “measurement is the first step that leads to the control system, then ultimately leads to obtaining
improved”[5]. The quality measure is a critical stage in the three main operations; (1) quality planning (2) quality
control, and (3) quality.
The Bell Labs Inc. for “wired-mobile” had a significant impact on the development of quality
measurement. In 1925, a new department had been established for the development and examination production
process and quality measure for the quality of economic criteria. This leads to obtaining several benefits in this
theme. This development is included; Acceptance samples, LTPD sampling tables, AOQL sampling tables, and
the demerit system [7].
C. DEMERIT SYSTEM
In 1926, demerit system introduced for the first time by (Dodge), and has been applied exclusively to
Western Electric Company. Where this system can be used with any product which has non-conformities varying
degrees of risk. Therefore, it is determined according to the level of the defect and its impact on the product
quality [9].](https://image.slidesharecdn.com/a06090107-161118122313/85/Assess-quality-level-of-the-final-product-by-using-Demerit-system-A-case-study-in-one-industry-of-General-Company-for-Electronic-Industries-2-320.jpg)
![Assess quality level of the final product by using Demerit system: A case study in one industry of ..
3
The main objective of the use of demerit system is to identify several different types of defects in the complex
products at one time [10]. This is applied through classified defects into four categories with giving relative
weights for each category according to the demerit system, as follows[11]:-
Class (A) Defects: Very serious, which established with a relative weight (100).
Class (B) Defects: Seriously, this established with a relative weight (50).
Class (C) Defects: Moderately serious, which established with a relative weight (10).
Class (D) Defects: Not serious, which established with a relative weight (1).
To apply the demerit system requires a series of steps to be followed:-
1) Calculating Value demerit ( ) by the equation (1) as follows [9, 10]:-
)
Where;
: Number of demerit points for product unit.
The number of defects diagnosed for category (A, B, C, D),during the evaluation period.
n: The number of units that have been evaluated during a specific period of time.
2) Determine the level of the quality levelof the final product in accordance with international standard ISO 9000
and related accessories, by relying on a number of demerit point diagnosed per unit as shown in Table 1 [12].
Table 1 Quality classifies according to the number of demerit points
Number of
demerit points
Quality
ratio
Quality
Recognition
Class Quality
0 - 0.99 100% Very Excellent First
1 – 1.99 90% Excellent Second
2 – 2.99 80% Very good Third
3 – 3.99 70% Good Fourth
4 - 4.99 60% Acceptable Fifth
5 and over - Rejected -
3- Calculating standard level of quality ( ), by using the following equation (2) [13, 14].
+10 + 1
Where;
: Standardized level of quality
, , ,and :The average defects per unit of each category (A, B, C, and D) for the number of samples. This
is calculated as follows:-
= =
=
4- Calculating Quality Index ( ) for the comparable value demerit ( ) with the standard level of quality ( ). A
calculates obtained by using the following equation [15].
After determining the value of ( ), the evaluation will be conducted according to the following cases: -
A- If [ = 1]; the level of quality is equal to the standard level of quality.
B- If [ I <1]; the level of quality is better than the standard level of quality.
C- If [ >1]; the level of quality is less than the standard level of quality.
5) Establishment of the demerit control chart for the number of demerits to determine the number of units that
are outside the control limits, by using the following equations; 4, 5 and 6 [13, 14].
Where:-
CL: Central line
UCL: Upper Control Limit
LCL: Lower Control Limit
The standard deviation which is calculated according to the following equation (7):-
......(7)](https://image.slidesharecdn.com/a06090107-161118122313/85/Assess-quality-level-of-the-final-product-by-using-Demerit-system-A-case-study-in-one-industry-of-General-Company-for-Electronic-Industries-3-320.jpg)
![Assess quality level of the final product by using Demerit system: A case study in one industry of ..
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The demerit values during ( ),for these months (October/2013 and July/2014) are equal to (respectively;
4.56 and 4.52) outside the control limits. This appears that level of quality isan upper control limit (UCL).
This result shows the decline in the level of quality during these two months, this requires the identification
of the causes of this decline in order to avoid it in the future.
The demerit values ( ) during the months (December/2014 and August/2014) is appeared equal to (1). This
result is below the LCL.
That the occurrence of demerit values ( ) for months (December and August) for the year 2014 were under
the LCL,which indicated depreciation of demerits. This means that the quality level of the product has been
distinct for two months.
The existence of four samples outside the level of control limits means that demerit control chart is
statistically not significant. This has required identifying the samples that are outside the upper limit address
UCL. This represents a high failure and a low level of the quality, while the demerit values were below the
LCL. This represents the proportion of a few demerits and consequently the high level of the quality.
V. Conclusions
In this research, the results show a lack of rejected in the final production, because of the demerit values
is less than 5. This devaluation of demerit values leads to an increase in the level of product quality reflector. The
percentage of the standard level of quality of a reflective product was found (80%) during the evaluation period.
This percentage shows; the quality of the reflective product is a very good. Becauseof it’s turned out the factory's
ability to provide a reflective product with a high level quality than the standard level of the quality. Furthermore,
the demerit quality control of reflective product was not significant statistically, because of the presence of four
batches found outside the standard control liner.
The low-value demerits lead to an increase in the level of the quality of the Reflective Product.The
demerit system depends on four categories of defects, which are the main reason for obtaining a low-value of the
demerits.
VI. Recommendations
Using the demerit system in the industrial organization provides the ability to determine the quality of a
reflective product level, which are more accurate and detailed. Also, this system can assist the industrial
company to improve the quality of a reflective product standard level by reducing the value of the demerits.
Thus, improvement is in the quality level of the Reflective Product. This system is able to be applied in the
industrial organization through the adopted qualitative control tools during the various production stages.
References
[1]. Bale, Katalin, (2001),“The complex quality world:Developing Quality Management Systems for Software Companies”, Doctoral
thesis presented to the Technische Universiteit Eindhoven, Netherlands.
[2]. Garvin, D., (1984),“ what Does product quality really mean?”, salon management Review.
[3]. Juran, Joseph M. & Godfrey, A. Blanton, (1999),“JURAN’S QUALITY HANDBOOK”, 5th Ed, McGraw-Hill, New York, USA.
[4]. Seakhoa, Arthur, Conceptualising, (2007),“quality of a tourism destination': An investigation of the attributes and dimensions of
quality of a tourism destination”, Doctor thesis of Philosophy, University Bedfordshire, United Kingdom.
[5]. Singpai, Bodin, (2009),“Measurement System Analysis for Quality Improvement U sing Gage R&R Study at Company XYZ”,
Master thesis in Science Technology Management, University of Wisconsin-Stout, USA.
[6]. Gryna, Frank M. and Chua, Richard C. H. and Defeo, Joseph A., (2007), "Juran’s Quality Planning and Analysis”, 5th Ed, McGraw
Hill, New York, USA.
[7]. Godfrey, A. Blanton and Endres, C., (1994),“The Evolution of Quality Management Within Telecommunications”, IEEE
Communications Magazine, USA.
[8]. Burr, John T., (2004),“ Elementary Statistical Quality Control”, 2 the Ed, Taylor & Francis Group, New York, USA.
[9]. Kang, Hae Woon and Baik, Jae Won and Choi, Young Jae and Nam, Sung Ho, (2012),“Demerit-GWMA Control Chart with Fast
Initial Response”, Applied Mechanics and Materials, Vols. 157-158, Trans Tech Publications, Switzerland.
[10]. [10] Jones, L. allson and Woodall, William H. and conerly, (1999), “Exact Properties of Demerit Control Charts”, Journal of
Quality Technology, vol. 31, Issue 2.
[11]. Mitra, Amitava, (2008),“Fundamentals of quality control and improvement”, 3th Ed, John Wiley & Sons, INC., Publication,USA.
[12]. Al-Sabbagh, Mohammed Abdel-Raouf Abdul Razzaq, (1998), "The development of quality engineering control system applied in
the case of the General Establishment for Sufi industries," Master degree in Industrial Engineering, University of Technology,
Baghdad,Iraq.
[13]. Montgomery, Douglas C., (2013),“Introduction to Statistical Quality Control”, 7th Ed, John Wiley & Sons, Inc., USA.
[14]. Chimka, Justin R. and Arispe, Vanessa Cabrera, (2006),“New Demerit Control Limits for Poisson Distributed Defects”, Quality
Engineering, Vol 18, Issue 4, Taylor & Francis Group, LLC.
[15]. Al- Kazaz, Ismail Ibrahim, (2015), "Quality theory and application tuning", the first edition, Tigris for Publishing and Distribution,
Amman, Jordan.](https://image.slidesharecdn.com/a06090107-161118122313/85/Assess-quality-level-of-the-final-product-by-using-Demerit-system-A-case-study-in-one-industry-of-General-Company-for-Electronic-Industries-7-320.jpg)
Assess quality level of the final product by using Demerit system: A case study in one industry of General Company for Electronic Industries
- 1. Research Inventy: International Journal of Engineering And Science Vol.6, Issue 9 (October 2016), PP -01-07 Issn (e): 2278-4721, Issn (p):2319-6483, www.researchinventy.com 1 Assess quality level of the final product by using Demerit system: A case study in one industry of General Company for Electronic Industries Hussain ridha mahdi Al-ansari1 , A/P Dr. Nidaa Saleh Mahdi2 1 Department of Total Quality Management Techniques Technical College of Management Baghdad, Iraq 2 Department of Total Quality Management Techniques Technical College of Management Baghdad, Iraq Abstract: This research aims to use a demerit system as a method to evaluate the level of the quality of the final product. Demerit system was applied as a case study to obtain the research objectives in the factory of transformers and household appliances, which represents as a majority factory in the formations of the general company for Electronic Industries. In this research, the Reflective Product was selected as a sample research. Several of the quantitative and scientific instruments that represent demerit system were used to achieve the research objectives. The results demonstrations that adopted identified each of the level of the quality of the final Reflective Product and standard level of quality are very important during the period of the assessment final product. Keywords: Product quality; Demerit system; value demerit; standard level of quality; Quality Index; Demerit quality control I. Introduction Investigate the quality of product an important aim for any organizations, because of the poor quality of the products leads to affect customers' confidence. Thus, could be a reluctance to buy its products. This leads to encourage the majority of the organizations to focus on delivering a high level of the quality products. Investigate the product quality is examined through three phases; (1) pre-production (2) during the process of production, and (3) post-production. To ensure that the quality of the product is investigated, this research use method to assess the quality of the product for all operation process such us, a demerit system to evaluate the quality level the final product (post-production). This is a significantstage to evaluate the quality of the final product, as it represents the last stage before delivery to the customer, which needs focus on this stage in order to provide defect-free products. II. Methodology Currently, increasing complexity of the product leads to the appearance of different types of defects in the final industrial product,which effects on product quality. In additional on, the emphasis on quality at any/or all stages of the production process and the manufacturing process is required. Furthermore, evaluatethe quality of the final product is important for investigatingthe level of production quality, because, it represents the last stage before delivery to the customer. Thisneeds focus on the last stage of the production process in order to avoid the arrival of defective products to customers, which may harm the reputation of the organization. For this reason, theauthors’define the significant like this research, which can be expressed in the research problem by examining research questions. The research questions were: - 1) What is the level of quality of the final product reflective during the evaluation period? 2) What is the quality standard reflective of the level of the final product during the period of assessment? 3) Does the factory can provide a reflective product quality level higher than the standard level of quality during the evaluation period? The main objectives of this research are represented to identify; (1) the reflective quality level of the final product by using the demerit system (2) determine the standard level of quality reflective of the final product during the period of assessment, and (3) determine the industry's ability to presenting the highest level of product than the standard level of quality of reflective quality product during the period of assessment. The main significance of thisresearch is attempting to identify the level of the final product quality by using demerit system.Therefore,identify the enhancements to be made in order to improve the level of quality.This is reflected in improving the reputation of the Reflective Product in the market, as well as, provides the information to directors about the effects of the control system through demerit that display on the quality
- 2. Assess quality level of the final product by using Demerit system: A case study in one industry of .. 2 control, and motivates employees to establish new ideasthat associatedwith improving the quality and reducing the rates of defects in production. This is research applied in the factory of transformers and household appliances of the general company for electronic industries, because it produces a severaltypes of complex products. This offers the possibility to apply the demerit system. Reflective product has been chosen to be the research sample.Thisresearch adoptedthe case study method as being suitable to like this research. The data collected by using a several methods such as; (1) personal observations (2) interviews with the director’s and staff, and (3) access to records and its formal documents.The results enable the researchers to improve a rating system defects and assisted the factory area to evaluate the level of the quality product. III. Literature Review A. QUALITY The term of (Quality) is commonly used in the English Language. This term originally translated from the Latin word (QUALITUS), which is also a translation of the Greek word (ποιοτεσ) discovered by Affiliation. The meaning of quality has been changed over time, but still (good quality) means the reliability of products or services according to the productivity requirement [1]. Garvin (1984) presented five basic entrances to quality. These are as the following [2]:- 1) Entrance depends on use: Refers to quality according to this approach as the appropriate use of the product; the reliability of products/services to perform their function according to the specifications accepted by customer's satisfaction. 2)Entrance depends on the product: In this approach, quality refers to the accuracy and the ability to measure the items or characteristics, which required in the product as customers wanted. 3)The entrance of excellence: The quality within this entrance in the product's ability to satisfy the customer expectations. In this approach, the majority of organizations attempted to relevance between product characteristics and customer expectations. 4)Entrance depends on manufacturing: refers that quality display according to entrance-making "defect-free products", by adopting on comparison final product with design specifications required. This is consistent with the concepts of quality in Japan. 5)Entrance depends on the value: This approach aims that quality considered through their relationship with the price, as some of the customers may prefer the products that have a lower price compared with low specifications. Juran and Godfrey (1999) argued that the quality term has several of meanings; but, in this research has highlighted two of the most important meanings for the quality. These are as follows [3]:- a)Quality is those characteristics of the products that satisfactory to the customer needs. In this research, the quality directed to increase revenue. The purpose of providing the products or services within higher quality levels is to increase the customer satisfaction, which leads in general to increase revenues. b)Qualityis continuedact to remove the each of the defects and errors that need to extra work (re-work) in order to achieve, that leads to resented customers. In this case, the quality focus directed to the costs, as the higher quality means lower costs. B. MEASURING (EVALUATION) PRODUCT QUALITY The quality measure or evaluate are an important stage to achieve the quality of the product, because it contributions the majority of an organization to control progress that leads to achieving the goals of quality through the comparison between the actual performance and pre-defined goals [4]. The quality measurement is the first step to adjusting and improving the quality through the availability of accurate data required to analyse and solve the problems modify at the level of quality. Where, James Harrington the expert on the quality theme said; “measurement is the first step that leads to the control system, then ultimately leads to obtaining improved”[5]. The quality measure is a critical stage in the three main operations; (1) quality planning (2) quality control, and (3) quality. The Bell Labs Inc. for “wired-mobile” had a significant impact on the development of quality measurement. In 1925, a new department had been established for the development and examination production process and quality measure for the quality of economic criteria. This leads to obtaining several benefits in this theme. This development is included; Acceptance samples, LTPD sampling tables, AOQL sampling tables, and the demerit system [7]. C. DEMERIT SYSTEM In 1926, demerit system introduced for the first time by (Dodge), and has been applied exclusively to Western Electric Company. Where this system can be used with any product which has non-conformities varying degrees of risk. Therefore, it is determined according to the level of the defect and its impact on the product quality [9].
- 3. Assess quality level of the final product by using Demerit system: A case study in one industry of .. 3 The main objective of the use of demerit system is to identify several different types of defects in the complex products at one time [10]. This is applied through classified defects into four categories with giving relative weights for each category according to the demerit system, as follows[11]:- Class (A) Defects: Very serious, which established with a relative weight (100). Class (B) Defects: Seriously, this established with a relative weight (50). Class (C) Defects: Moderately serious, which established with a relative weight (10). Class (D) Defects: Not serious, which established with a relative weight (1). To apply the demerit system requires a series of steps to be followed:- 1) Calculating Value demerit ( ) by the equation (1) as follows [9, 10]:- ) Where; : Number of demerit points for product unit. The number of defects diagnosed for category (A, B, C, D),during the evaluation period. n: The number of units that have been evaluated during a specific period of time. 2) Determine the level of the quality levelof the final product in accordance with international standard ISO 9000 and related accessories, by relying on a number of demerit point diagnosed per unit as shown in Table 1 [12]. Table 1 Quality classifies according to the number of demerit points Number of demerit points Quality ratio Quality Recognition Class Quality 0 - 0.99 100% Very Excellent First 1 – 1.99 90% Excellent Second 2 – 2.99 80% Very good Third 3 – 3.99 70% Good Fourth 4 - 4.99 60% Acceptable Fifth 5 and over - Rejected - 3- Calculating standard level of quality ( ), by using the following equation (2) [13, 14]. +10 + 1 Where; : Standardized level of quality , , ,and :The average defects per unit of each category (A, B, C, and D) for the number of samples. This is calculated as follows:- = = = 4- Calculating Quality Index ( ) for the comparable value demerit ( ) with the standard level of quality ( ). A calculates obtained by using the following equation [15]. After determining the value of ( ), the evaluation will be conducted according to the following cases: - A- If [ = 1]; the level of quality is equal to the standard level of quality. B- If [ I <1]; the level of quality is better than the standard level of quality. C- If [ >1]; the level of quality is less than the standard level of quality. 5) Establishment of the demerit control chart for the number of demerits to determine the number of units that are outside the control limits, by using the following equations; 4, 5 and 6 [13, 14]. Where:- CL: Central line UCL: Upper Control Limit LCL: Lower Control Limit The standard deviation which is calculated according to the following equation (7):- ......(7)
- 4. Assess quality level of the final product by using Demerit system: A case study in one industry of .. 4 IV. Application demerit System Examines the sample items, then the classification of defects into four categories as shown in Table (2). This Table shows the number of defects and classes that are found in every month. Calculating value demerit ( ) by using equation (1), as well as, it’s applied for the time-out of the other months. Table 2 The number and types of defects Mon. 2013 2014 Classes of defects Classes of defects A B C D A B C D Jan. - 0 0 0 0 25 0 0 2 5 Feb. - 0 0 0 0 15 0 1 0 2 Mar. 30 0 1 1 4 25 0 0 3 2 Apr. 25 0 1 3 2 30 0 1 1 3 May 20 0 1 0 3 15 0 0 3 4 Jun. - - - - - - - - - - July 35 0 1 2 4 25 0 2 1 4 Aug. 30 0 2 1 2 35 0 0 3 5 Sept. 20 0 1 2 5 20 0 1 0 4 Oct. 25 1 0 1 3 25 0 0 4 3 Nov. 20 0 1 0 2 20 0 0 3 1 Dec. 15 0 0 2 3 - 0 0 0 0 Total 220 1 8 12 28 235 0 5 20 33 Determine the degree of level quality of the final product as shows in Table (1). The value of the demerit for the month of March is (2.13). So, the level of the production quality is (80%), this appears a very good. This method will be used to calculate demerit values and determine the level of quality for the time-out of the other months. The final results obtained showed in Table (3) and (4). Table 3 Value of the demerit and the level of quality reflective product in 2013 Table 4 Value of the demerit and the level of quality reflective product in 2014 Mon. 2014 Quality Rate Quality Recognition Class Quality Jan. 1 90% Excellent Second Feb. 3.46 70% Good Fourth Mar. 1.28 90% Excellent Second Mon. 2013 Quality Rate Quality Recognition Class Quality Jan. - - Feb. - - Mar. 2.13 80% Very good Third Apr. 3.28 70% Good Fourth May 2.65 80% Very good Third Jun. - - - - July 2.11 80% Very good Third Aug. 3.73 70% Good Fourth Sept. 3.75 70% Good Fourth Oct. 4.52 60% Acceptable Fifth Nov. 2.6 80% Very good Third Dec. 1.53 90% Excellent Second
- 5. Assess quality level of the final product by using Demerit system: A case study in one industry of .. 5 Apr. 2.1 80% Very good Third May 2.26 80% Very good Third Jun. - - July 4.56 60% Acceptable Fifth Aug. 1 90% Excellent Second Sept. 2.7 80% Very good Third Oct. 1.72 90% Excellent Second Nov. 1.55 90% Excellent Second Dec. - - As can be seen in Table3 & 4, the results obtain above are investigated the first question in this research. Calculating the value of a standard level of quality for a reflective product by using equation 2. =0.002198== == == == As can be seen from the results above, that ( ) estimated (2.48) as indicated in Table (2). The percentage of outcomes of the product quality in the factory of a transformer and home appliances for a reflective product during the years (2013 and 2014)were estimated at about 80%. This appears a very good rate. The class degree of level quality is the Third. These results answered the second question in the research. 5- Calculating Quality Index ( ) by using equation (3). This is also applied for other months. As can be seen from the results obtained above, the quality index value for the month of March was less than 1. This means that the quality of a reflective product for this month has a better level degree of the standard quality. The final results for other months will be calculated quality indicator during the evaluation period, as illustrated in Tables 5 and 6. As an be seen from the results indicated in Table 5 and 6, the factory appears to have the ability to produce higher level of the production than the standard level of the quality during the evaluation period. This represents appears an answer to the Third question research. Table 3 Quality Index in 2013 Mon. 2013 The status Jan. - - - Feb. - - - Mar. 2.13 2.48 0.85 Best Apr. 3.28 2.48 1.31 Less May 2.65 2.48 1.06 Less Jun. - - - July 2.11 2.48 0.85 Best Aug. 3.73 2.48 1.50 Less Sept. 3.75 2.48 1.50 Less Oct. 4.52 2.48 1.81 Less Nov. 2.6 2.48 1.04 Less
- 6. Assess quality level of the final product by using Demerit system: A case study in one industry of .. 6 Dec. 1.53 2.48 0.61 Best Table 4 Quality Index in 2014 Mon. 2014 The status Jan. 1 2.48 0.40 Best Feb. 3.46 2.48 1.39 Less Mar. 1.28 2.48 0.51 Best Apr. 2.1 2.48 0.84 Best May 2.26 2.48 0.91 Best Jun. - - - July 4.56 2.48 1.83 Less Aug. 1 2.48 0.40 Best Sept. 2.7 2.48 1.08 Less Oct. 1.72 2.48 0.69 Best Nov. 1.55 2.48 0.62 Best Dec. - - - 6- Establishment the demerit control chart for the number of demerit system by using equations 4, 5 and 6. = 0.47014 UCL=2. 48+ (3*0.47014) UCL=3. 89 LCL=2. 48-(3*0.47014) LCL=1. 07 As can be seen from the results obtained above, the limits of the demerit control chart are identified. As well as, the values of the demerit were described in Tables 3 and 4. Figure (1) shows the demerit control chart. Fig..1. Demerit control charts for Reflective product (2013 -2014) As can be seen in Figure 1 above, the results obtain from data collectedshowsas the following:-
- 7. Assess quality level of the final product by using Demerit system: A case study in one industry of .. 7 The demerit values during ( ),for these months (October/2013 and July/2014) are equal to (respectively; 4.56 and 4.52) outside the control limits. This appears that level of quality isan upper control limit (UCL). This result shows the decline in the level of quality during these two months, this requires the identification of the causes of this decline in order to avoid it in the future. The demerit values ( ) during the months (December/2014 and August/2014) is appeared equal to (1). This result is below the LCL. That the occurrence of demerit values ( ) for months (December and August) for the year 2014 were under the LCL,which indicated depreciation of demerits. This means that the quality level of the product has been distinct for two months. The existence of four samples outside the level of control limits means that demerit control chart is statistically not significant. This has required identifying the samples that are outside the upper limit address UCL. This represents a high failure and a low level of the quality, while the demerit values were below the LCL. This represents the proportion of a few demerits and consequently the high level of the quality. V. Conclusions In this research, the results show a lack of rejected in the final production, because of the demerit values is less than 5. This devaluation of demerit values leads to an increase in the level of product quality reflector. The percentage of the standard level of quality of a reflective product was found (80%) during the evaluation period. This percentage shows; the quality of the reflective product is a very good. Becauseof it’s turned out the factory's ability to provide a reflective product with a high level quality than the standard level of the quality. Furthermore, the demerit quality control of reflective product was not significant statistically, because of the presence of four batches found outside the standard control liner. The low-value demerits lead to an increase in the level of the quality of the Reflective Product.The demerit system depends on four categories of defects, which are the main reason for obtaining a low-value of the demerits. VI. Recommendations Using the demerit system in the industrial organization provides the ability to determine the quality of a reflective product level, which are more accurate and detailed. Also, this system can assist the industrial company to improve the quality of a reflective product standard level by reducing the value of the demerits. Thus, improvement is in the quality level of the Reflective Product. This system is able to be applied in the industrial organization through the adopted qualitative control tools during the various production stages. References [1]. 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