Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: First Term
Week: 11
Age: 15 years
Duration: 45 minutes
Subject: Clothing and Textiles
Curriculum Theme: Clothing and Textiles
Previous Lesson: Manufacturing and Properties of Fibre: Wool.
Topic: MANUFACTURING AND PROPERTIES OF FIBRE
Subject Matter: manufacturing process of artificial fibres, properties of rayon, properties of nylon, properties of polyester, uses of artificial fibres

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define artificial fibres.
Describe the general manufacturing process of artificial fibres.
State at least three properties of rayon.
State at least three properties of nylon.
State at least three properties of polyester.
List at least four uses of artificial fibres.

Affective Domain:

Appreciate the importance of artificial fibres in everyday products.
Show interest in identifying different types of fibres in textiles.

Psychomotor Domain:

Identify fabric samples made from rayon, nylon, and polyester.
Distinguish between the feel and appearance of different artificial fibre fabrics.

Collaborate with peers to compare the properties of different artificial fibres.

Reference Materials

The following resources were used in planning this lesson:

Senior Secondary Education Curriculum for Clothing and Textiles.
State Unified Scheme of Work for Senior Secondary Schools.
Popoola, J. O. (2018). Clothing and Textile for Senior Secondary Schools 1-3. Learn Africa Plc.

Instructional Materials

The teacher will teach this lesson with the aid of:

Samples of rayon, nylon, and polyester fabrics.
Charts showing the manufacturing process of artificial fibres.
Pictures of products made from artificial fibres.

Rationale for the Lesson

This lesson helps pupils understand the origin and characteristics of man-made fibres that are common in textiles today. Knowing these properties helps pupils make informed choices about clothing and other fabric items, and also provides insight into the textile industry.

Prerequisite/Previous Knowledge

Pupils should have a basic understanding of natural fibres and their general characteristics.

Lesson Content/Board Summary

MANUFACTURING AND PROPERTIES OF ARTIFICIAL FIBRES

What are Artificial Fibres?

Artificial fibres, also known as man-made or synthetic fibres, are textile fibres produced from chemical substances rather than directly from natural sources like plants or animals. They are engineered to have specific properties.

General Manufacturing Process of Artificial Fibres

The general process involves converting raw materials into a viscous liquid, which is then forced through tiny holes (spinnerets) to form continuous filaments. These filaments are then solidified and processed into yarn.

The following are the general steps:

Preparation of polymer solution: Raw materials are chemically treated to form a polymer solution or melt.
Extrusion (Spinning): The solution or melt is forced through a spinneret, which is a device with many small holes, to form continuous filaments.
Solidification: The filaments solidify either by drying in air (dry spinning), by coagulation in a chemical bath (wet spinning), or by cooling (melt spinning).
Drawing: The solidified fibres are stretched to align the polymer molecules, which improves their strength and other properties.
Finishing: Fibres may undergo further treatments like crimping, cutting, or blending to prepare them for textile production.

Properties of Rayon

Rayon is a regenerated cellulose fibre, meaning it is made from purified cellulose (usually from wood pulp) that is chemically converted back into a fibre. It is often referred to as artificial silk.

The following are properties of rayon:

Soft and comfortable.
Highly absorbent.
Drapes well.
Weak when wet.
Shrinks easily unless treated.
Subject to mildew.

Properties of Nylon

Nylon is a synthetic polymer, and was the first truly synthetic fibre. It is known for its strength and elasticity.

The following are properties of nylon:

Very strong and durable.
High elasticity and resilience.
Resistant to abrasion.
Low absorbency (dries quickly).
Resistant to most chemicals, mildew, and insects.
Melts at high temperatures.

Properties of Polyester

Polyester is a synthetic fibre made from petroleum-based polymers. It is widely used in clothing and industrial applications.

The following are properties of polyester:

Strong and durable.
Resistant to stretching and shrinking.
Wrinkle-resistant.
Quick-drying due to low absorbency.
Resistant to most chemicals, mildew, and abrasion.
Retains heat-set pleats and shapes well.

Uses of Artificial Fibres

Artificial fibres are used in a wide range of products due to their varied properties.

The following are common uses of artificial fibres:

Rayon: Clothing (dresses, linings, shirts), home furnishings (upholstery, drapes), industrial products (tyre cords).
Nylon: Hosiery, sportswear, swimwear, carpets, ropes, seatbelts, parachutes.
Polyester: Clothing (shirts, trousers, jackets), bed sheets, curtains, upholstery, industrial fabrics (conveyor belts, tarpaulins).

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to identify some fabric samples (e.g., a silk scarf, a cotton shirt, a nylon stocking). The teacher then asks what they know about where these fabrics come from, focusing on natural vs. man-made.
Pupils’ Activity: Pupils respond to the teacher’s questions and attempt to identify the fabrics.
Learning Point: Pupils recall previous knowledge about fibres and are introduced to the concept of man-made materials.

Step 2: Explanation of Artificial Fibres and Manufacturing

Time: 10 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher defines artificial fibres and explains the general manufacturing process using a chart or diagram. The teacher clarifies that these fibres are engineered for specific purposes.
Pupils’ Activity: Pupils listen attentively, ask questions for clarity, and take notes.
Learning Point: Pupils understand what artificial fibres are and how they are generally produced.

Step 3: Properties of Rayon

Time: 5 minutes
Teaching Skill: Demonstration/Discussion
Teacher’s Activity: The teacher presents a rayon fabric sample, discusses its properties (softness, absorbency, drape), and explains its common uses. The teacher also highlights its weakness when wet.
Pupils’ Activity: Pupils observe the sample, feel it, and note down the properties and uses of rayon.
Learning Point: Pupils learn the specific characteristics and applications of rayon.

Step 4: Properties of Nylon

Time: 5 minutes
Teaching Skill: Demonstration/Discussion
Teacher’s Activity: The teacher presents a nylon fabric sample, discusses its properties (strength, elasticity, quick-drying), and explains its common uses. The teacher may stretch the sample to demonstrate elasticity.
Pupils’ Activity: Pupils observe the sample, feel it, and note down the properties and uses of nylon.
Learning Point: Pupils learn the specific characteristics and applications of nylon.

Step 5: Properties of Polyester

Time: 5 minutes
Teaching Skill: Demonstration/Discussion
Teacher’s Activity: The teacher presents a polyester fabric sample, discusses its properties (wrinkle-resistance, durability, quick-drying), and explains its common uses. The teacher may show how it resists creasing.
Pupils’ Activity: Pupils observe the sample, feel it, and note down the properties and uses of polyester.
Learning Point: Pupils learn the specific characteristics and applications of polyester.

Step 6: Uses of Artificial Fibres

Time: 5 minutes
Teaching Skill: Question and Answer/Reinforcement
Teacher’s Activity: The teacher engages pupils in a question-and-answer session about the various uses of rayon, nylon, and polyester, reinforcing the connection between fibre properties and their applications.
Pupils’ Activity: Pupils contribute examples of products made from each fibre and discuss why specific fibres are suitable for certain uses.
Learning Point: Pupils consolidate their understanding of how artificial fibre properties dictate their uses.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define artificial fibres.
Mention two general steps in the manufacturing process of artificial fibres.
State three properties of rayon.
List two uses of nylon.
Explain why polyester is suitable for making school uniforms.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the importance of artificial fibres in the modern world and their distinct properties compared to natural fibres. The teacher assigns homework: research other types of artificial fibres.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils reinforce their understanding of the topic and are encouraged to explore further.

Lesson Keywords

Artificial fibres – Textile fibres produced from chemical substances.
Rayon – A regenerated cellulose fibre known for softness and absorbency.
Nylon – A strong, elastic, and durable synthetic fibre.
Polyester – A strong, wrinkle-resistant, and quick-drying synthetic fibre.
Manufacturing – The process of making products from raw materials.
Properties – The characteristic qualities of a material.
Uses – The applications or purposes for which a material is employed.

Differentiation

For visual learners, the use of fabric samples and charts showing manufacturing processes will be helpful. Kinesthetic learners will benefit from handling and feeling the different fabric samples. Advanced learners can be challenged to research the environmental impact of artificial fibre production, while struggling learners can be provided with simplified notes or paired with peers for support during activities.

Note for teachers using this lesson plan

Ensure that actual fabric samples of rayon, nylon, and polyester are available for pupils to touch and observe. This hands-on experience greatly enhances understanding of the properties. Encourage pupils to compare the feel of these artificial fibres to natural fibres they may already know. The discussion should encourage critical thinking about why certain fibres are chosen for particular products.