৪৯তম বিসিএস ⎯ গার্হস্থ্য অর্থনীতি [৩৯১]

The family’s income level determines how much can be spent on clothes, affecting quality, quantity, and variety.

•Seed fibers: Cotton, Kapok, Silk cotton
•Bast fibers (from stem or bark): Jute, Flax (linen), Hemp
•Leaf fibers: Manila hemp, Pineapple leaf fiber
Fruit fibers: Coir (from coconut husk)

Natural fibers are fibers that come directly from nature, without human chemical processing.
Plant-based fibers (Vegetable fibers): Cotton, Jute, Flax, Coir
Animal-based fibers (Animal fibers): Wool, Silk

Vegetable Fibers (Plant-based fibers)
These come from various parts of plants such as seeds, stems, leaves, and fruits. Their main component is cellulose

Cellulose-based Fibers:
Made by chemically processing natural cellulose materials like bamboo, cotton linters, wood pulp, etc.
Examples: Rayon, Acetate, Triacetate.
Non-cellulose Polymer Fibers:
Made from synthetic polymers like carbon, hydrogen, oxygen, nitrogen through chemical synthesis.
Examples: Nylon, Polyester, Acrylic, Vinyl.

The lumen is the hollow channel inside the cotton fiber that plays an important role in:
Moisture Absorption: It acts like a capillary tube, allowing cotton to absorb water and other liquids efficiently.
Flexibility: Because of the lumen, cotton fibers can bend without breaking easily.
Drying Behavior: When moisture enters the lumen, cotton becomes heavy and takes time to dry.

•Gender Composition
The number of males and females affects the variety and types of clothes planned, as women’s clothing often involves more variety than men’s.

Characteristics of Silk Fiber (রেশম তন্তুর বৈশিষ্ট্য)
1.Natural filament fiber – long, continuous, smooth, and shiny,Strong, but weaker when wet,Soft, luxurious, and flexible
2.Highly absorbent – keeps body cool in summer and warm in winter
3.Sensitive to sunlight, heat, and acids

The general composition of cotton fibers is as follows:
•Cellulose: 87% to 90%
•Water: 7% to 10%
•Other natural substances: 4% to 6%

Nylon, Polyester, and Acrylic are man-made fibers.so they are non-cellulose polymer fibers.They are not obtained from plants or animals, but are produced in factories through chemical synthesis.The raw materials for these fibers are synthetic polymers made from elements like carbon, hydrogen, oxygen, and nitrogen.

Warm clothes for winter, breathable fabrics for summer, and rainwear for rainy seasons are planned according to climate.

Clothing needs change over time within the same family because age is a dynamic factor. As family members grow older, their clothing requirements shift due to:
Physical Growth:Children outgrow their clothes quickly and need new sizes frequently.
Adults maintain size for longer but may require changes due to aging.
Lifestyle Changes:Babies need soft, easy-to-wash clothes.
Teenagers prefer trendy, fashionable outfits.
Adults often need formal or work-related clothing.
Elderly people need comfortable, loose-fitting garments.

Wool Fiber (উল তন্তু)
Category: Animal Fiber (প্রাণিজ তন্তু)
Source: Hair of sheep, goats, camels, yak, alpaca, llama
Origin: Wool is made of protein called keratin, which provides elasticity and warmth.

Cotton, Jute, Wool = Natural fibers (from plants or animals)
Nylon = Synthetic fiber, made chemically by humans using petroleum-based compounds.

Characteristics of Wool Fiber (উল তন্তুর বৈশিষ্ট্য)
Soft, elastic, and crimped (provides bulk and warmth),Strong and durable, weaker when wet,Good moisture absorption and insulation,Resists wrinkling and soiling,Sensitive to alkalis, moths, and sunlight,Flammable, burns slowly with a smell like burning hair.

Current fashion trends should be considered partially while planning clothing so that the clothes look modern and stylish. However, they should not dominate entirely because durability, comfort, and budget are also important factors.

Protein fibers like Azlon and Casein fibers are made from proteins obtained from milk or cereal plants, whereas Nylon, Polyester, and Rayon are synthetic or cellulose-based fibers.

Protein Fibers:
Made from proteins found in milk or cereal plants using special processes.
Examples: Azlon, Casein fibers.
Mineral-based Fibers:
Made from silica sand, limestone, and other minerals.
Example: Glass fiber.
Metallic Fibers:
Made from metals like aluminum, silver, gold after purification.
Used in special textiles with metallic properties.
Rubber Fibers:
Made from natural or synthetic rubber, used to make elastic fabrics

•Budget
Clothing budget must be realistic and generally not exceed about 15% of the total family income, balancing clothing expenses with other needs.

Wool comes from the fleece of sheep (and sometimes goats, alpacas, etc.).It is composed mainly of protein (keratin).It is obtained directly from nature, without being chemically synthesized in factories.whereas the others are man-made/artificial fibers.

Filament Fibers:
Long fibers (one meter or longer), such as natural silk and all synthetic fibers. They usually look smooth and shiny. Filaments require less twisting to make yarn.

A budget is a plan for how to spend money. A realistic budget means planning your expenses according to your actual income and needs, not overspending or underestimating.

Filament Fibers (ফিলামেন্ট তন্তু)
Definition: Long fibers (1 meter or more in length).
Examples: Natural: Silk
Synthetic: All man-made fibers like Nylon, Polyester

Mineral Fibers
Natural mineral fibers obtained from mines.
•Example:Asbestos, which is mined and used in textile applications in some regions.

Effect of Light: Prolonged exposure to sunlight turns cotton yellow and weakens it; should be stored away from direct sunlight.

Understanding what you already have:Before buying new clothes, you need to know what clothes are already in the wardrobe.
This helps prevent unnecessary purchases and ensures that old but usable clothes are utilized.
Assessing needs:Each family member has different clothing needs depending on age, profession, lifestyle, and personal preferences.
For example, a student may need school uniforms, while an office worker needs formal wear.

Effect of Acids: Mild acids cause little damage, but strong acids damage fibers.
Effect of Alkalis: Both mild and strong alkalis cause no harm.
Effect of Bleaching: Can be bleached, but bleaching shortens fabric lifespan

Effect of Heat: Withstands dry heat up to about 100°F without damage, but turns brown and chars at 475°F

Staple Fibers:
Short fibers (a few centimeters long). All natural fibers except silk are staple fibers. Synthetic fibers can also be cut into staple length. These require more twisting during yarn production.

Textile fibers (or simply fibers) are the basic raw materials used to make yarns and fabrics. A yarn is made by combining many fibers.The word “Textile” originates from the Latin word “Texo”, meaning “to weave” or “to construct.”
What is a Fiber?
A fiber is defined as the raw material used in manufacturing textiles, such as cotton, rayon, wool, silk, nylon, etc.

The fibers of cotton cloth are obtained from the lint of cotton bolls. Cotton plants usually grow to a height of three to five feet. At first, pinkish flowers bloom on the plant. Later, these flowers develop into cotton bolls. When the fruit ripens, it bursts open, and the white cotton lint emerges. Under the sun, the moisture dries up, and the fibers are scattered by the wind. These fibers are separated from the seeds with the help of machines. On average, cotton fibers have about 150 twists or convolutions per inch, with high-quality fibers having up to 250 twists per inch.

Biological Properties:
Fungal Attack: Easily attacked by fungi, leading to fabric damage.
Insect Attack: Attacked by insects like silverfish.
Flammability: Burns quickly with the smell of burning paper.

A yarn is a continuous length of fibers twisted or spun together.Yarns are made by combining many fibers to give strength, uniformity, and flexibility.
Yarns are then used to make fabrics through weaving, knitting, or other methods.
Example:Cotton fibers are spun together to make cotton yarn.
Wool fibers are spun together to make wool yarn.

Linen fibers have a polygonal cross-section but often appear oval.

From the earliest ages of civilization, cotton has been used for making cloth and garments. Even today, cotton enjoys widespread use across the globe. Despite the existence of many different types of fibers, cotton still retains strong popularity. For these reasons, cotton fiber is called the “King of Fibres.”

The word “Textile” originates from the Latin word “Texo”, meaning “to weave” or “to construct.”

Linen is a vegetable stem or bast fiber, found inside the woody stalk of the flax plant. Among plant-based fibers, linen ranks just after cotton in importance. This fiber comes from the flax (or “mushina”) plant.

Characteristics of Wool Fiber (উল তন্তুর বৈশিষ্ট্য)
Soft, elastic, and crimped (provides bulk and warmth),Strong and durable, weaker when wet,Good moisture absorption and insulation,Resists wrinkling and soiling,Sensitive to alkalis, moths, and sunlight,Flammable, burns slowly with a smell like burning hair.

Fiber Length:
Longer than cotton fibers. Fine linen fibers are generally 15–45.7 cm (6″–18″) in length.

Effect of Acids:
Damaged by hot, dilute acids and cold, concentrated acids, but unaffected by cold, dilute acids.

Silk Fiber (রেশম তন্তু)
Category: Animal Fiber (প্রাণিজ তন্তু)
Source: Produced by silkworms (Bombyx mori) from cocoons
Origin: The fiber is secreted as a protein called fibroin and coated with sericin

Biological Properties:
Fungal Attack: Easily attacked by fungi, leading to fabric damage.
Insect Attack: Attacked by insects like silverfish.
Flammability: Burns quickly with the smell of burning paper.

Textile fibers (or simply fibers) are the basic raw materials used to make yarns and fabrics. A yarn is made by combining many fibers.The word “Textile” originates from the Latin word “Texo”, meaning “to weave” or “to construct.”

Cotton when exposed to flame → It catches fire easily, producing a smell similar to burning paper.This happens because cotton = cellulose, and cellulose decomposes into volatile gases on heating, which burn quickly.
It does not melt (unlike synthetic fibers such as nylon or polyester), but burns completely to ash.

Countries like the Soviet Union (former), Germany, Belgium, France, the United Kingdom, the Netherlands, and Switzerland produce flax in large quantities. Among them, Belgium produces the highest quality linen.

Natural fibers are obtained from plants or animals.Examples: Cotton (from cotton plant), Wool (from sheep), Silk (from silkworms).
Synthetic or man-made fibers are produced from chemicals.Examples: Nylon, Polyester, Rayon.
Cotton is a plant-based natural fiber, widely used for making fabrics like t-shirts, sarees, and bedsheets.

Molecular Structure:
Cotton fiber belongs to the category of vegetable fibers. It is composed of cellulose, a substance obtained from plant bodies. Cellulose consists of carbon (C), hydrogen (H), and oxygen (O). Therefore, the chemical formula of cellulose is represented as (C₆H₁₀O₅)ₙ, where “n” indicates a variable number.

Characteristics of Linen Fiber (লিনেন তন্তুর বৈশিষ্ট্য)
Strong and durable,Smooth and straight,Absorbs moisture well,Cool and comfortable in summer,Can be bleached and dyed easily,Wrinkles easily (needs ironing)

Ordinary cotton fibers have about 150 twists per inch, while high-quality fibers have up to 250 twists per inch.

Natural fibers are obtained from plants or animals.Examples: Cotton (from cotton plant), Wool (from sheep), Silk (from silkworms).
Synthetic or man-made fibers are produced from chemicals.Examples: Nylon, Polyester, Rayon.
Cotton is a plant-based natural fiber, widely used for making fabrics like t-shirts, sarees, and bedsheets