For any organization to achieve its profit-maximizing goals, its products must be of high quality in order to satisfy its customers and compete with any other product on the market. To obtain quality products, some control measures, such as a quality control method, are required in any organization’s production process. This study focuses on the use of statistical quality control in plastic production to ensure that the quality of the plastic produced does not deviate from the standards set.



Data on the weight of plastics produced from properly recorded information was collected using a secondary method of data collection. The mean chart and range charge were used in the analysis. The charts were used at the same time. in the investigation of process average weight and individual variability. The process appears to be under control, as the weight of the plastics falls within the specification limits. Infant mortality


Title page I

Approval page ii

Dedication iii

acknowledgement iv

Abstract v

vi Table of Contents


1.0 1. Introduction

1.1 Study Background 5


1.3 Study Goal 7

The study’s significance is discussed in detail in section 1.4.

1.5 Research issues 8

1.6 Study Scope 9

1.7 Study Limitations 9

1.8 Term Definitions 10


2.0 Examine the Literature 11


3.0 Inauguration 16

16 3.1 Data Collection Method

17 3.2 Data collection issue

3.3 Analytical Method 17


4.0 Data visualization and analysis 22

4.1 Weight of plastic data analysis

Appendix I 22

Data analysis on plastic weight

23 hangers (in grams)


5.0 Summary, findings, conclusion, and suggestions34

5.1 Summary 34

5.2 Findings 35

Conclusion 36

5.4 Suggestion 36

Reference number 38

Appendix 39 is a list of appendices.




Walter Shewhart of the Bell Telephone Laboratory pioneered the use of statistical quality control in manufacturing in 1924.
All organizations that produce goods and services for the general public strive to produce and provide goods that are acceptable to consumers.
Quality control has recently become a necessary tool for all organizations whose goal is to excel and stay in business. This is obvious because the quality of a product or service is a measure of its ability to fulfill or satisfy a consumer’s implicit expectation or explicit requirement.
The American Standard Institute, on the other hand, defines quality control as “the totality of features and characteristics of a product or service that bear on its performance.”It is the ability to meet a specific need. To achieve the desired quality, it is necessary to control all of the factors that will impart the necessary or required quality on the product or service.

Furthermore, the goal of quality control is to provide quality that is satisfactory in terms of safety, adequacy, reliability, and economy, especially during this period of advancement in industrial development, when much emphasis is placed on product standards.

In some industries, people or machines perform measurement, inspection, and testing on a regular basis to ensure that the required quality is sent to market.

The statistical quality control method allows us to get the most out of production and inspection while spending the least amount of money. It is among the

It is one of the most important economic applications of sampling theory in industries.

Furthermore, it is clear of the dangers associated with relying on a mono-cultural type of economy, which is characterized in most developing countries, since the worldwide out glut of 1982, it has become completely clear that petroleum oil, a major export commodity, cannot save the country’s entire economy. As a result, a concerted effort must be made to diversify, which includes generating foreign exchange.

This can only be accomplished effectively by making our locally manufactured products more competitive in terms of quality and price, necessitating the use of a dynamic quality control system.

A total quality control system begins with the specification of what is required, followed by product testing.

designed to meet the specification. The inspection to ensure standard compliance, with the knowledge that production, defined as the process of manufacturing goods and services for human consumption, is not complete until the said products reach the final consumer. In this context, reaching the final consumer implies that the product has been accepted by the consumer.

Thus, the importance of quality control cannot be overstated here, because it is obvious that a consumer will only accept a product of high quality. Thus, one of the factors that should be prioritized in the pursuit of high productivity is the provision of a suitable work environment in research development.

Furthermore, among the numerous advantages of quality control in the industry are the


a. It significantly improves quality and productivity.

b. Provides information about product quality.

c. Increases efficiency and reduces costs

d. Result in increased profit

Despite these benefits, there are some issues with quality control, which include:

i. The absence of trained personnel

ii. A scarcity of high-quality raw materials

iii. Inadequate statistical information records

However, once these issues are resolved, the quality control plastic industry, such as ADAOBI PLASTIC NIG LTD, requires the use of statistical quality control techniques to evaluate the quality of its products.


Plastic is “one of the greatest innovations of the millennium,” according to the cover of New Week, and they have certainly lived up to their reputation. It has recently become one of the most popular materials.

Because the quality of plastic determines its durability and marketing.

Plastic usage is currently highly competitive. Most Nigerians and researchers want to see plastic improvement. To meet these requirements, ADAOBI PLASTIC NIG LTD must improve the quality of the materials and services used in its production while also reducing waste and operational costs.


Adaobi Nigeria Limited was established in Nigeria on June 28, 1979.

as a private company.

Since its inception, the company has been involved in the importation and distribution of plastic products such as polythene bags, sheets, and wrappers. After gaining extensive experience in polythene marketing, the company decided to establish its own manufacturing facility. In the year 1984, it began producing polythene products.

The company produces agro-polythene sheets as well as convenience shopping bags. Its products are used both inside and outside the country, particularly in ECOWAS countries and Cameroons.

Following the decision to build another factory to supplement the existing one, the company began construction of a solid mineral processing plant in the year 2000. It first went into production in 2001. The chemical plant’s primary function is to process solid minerals.

Recognizing the significance

The role of information in business growth and impetus. It has recently received, reducing the world to a global village, the company in 2002 veered into information technology services in addition to other businesses.

In 2007, the company expanded her product line in the plastic division to include hard plastic production, blow and injection molding, and soft filin downsizing. This diversification expanded the company’s product line to include jerry cans and hangers in sizes ranging from 20 to 25 to 50 litres. All of this was done to meet the people’s day-to-day needs.


i. To maintain product quality and to keep product quality from falling below the desired level during production.

ii. Make useful suggestions to the company under consideration for improving quality control.


The significance of this study was aimed at revealing the benefits of statistical quality control in a manufacturing process in the long run.

It is also hoped that this study will serve as a guide for manufacturers who are producing goods for consumers to:

i. Enable the production of goods that meet specifications

ii. Allow manufacturers to use only standard quality materials during production.

iii. Assist the company in maximizing profits

iv. Increase customer satisfaction


1. Does the finished product meet the established standard?

2. Is there any unnecessary waste in the company?

3. What are the company’s plastic production standards?

4. Could an irregular and insufficient supply of quality control plastic material reduce industrial production?

5. How will the company maintain a consistent standard?

These are the kinds of questions that stump the researcher.


This study examines the quality control problem and potential solutions for the manufacturing industries.

It focuses on ADAOBI PLASTIC NIG LTD’s processes and operations.


This study will focus on the ADAOBI PLASTICS process and operations. Its scope will be limited to the quality control techniques employed by this firm. This project work is restricted to a specific area to ensure the accuracy of data collected, and it should be limited to a single production firm to avoid misappropriation.


Quality: The degree to which a given product conforms to specifications and standards.

Control is the process of regulating and keeping things in order.

Quality control: A mechanism for maintaining and controlling the quality of manufactured goods in order to ensure product conformity with standards.

Production is the process of making goods and providing services for human consumption.

Inspection is a method of determining the conformity of a process or finished parts to specifications.


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