Types of secondary textile products
A primary textile product is the fibre, yarn or fabric. A secondary product is made by cutting, sewing or joining fabric.
- Clothing (apparel): shirts, trousers, uniforms, sportswear, saris and kimonos.
- Home textiles: curtains, bedsheets, towels, carpets, cushions.
- Industrial and technical textiles: conveyor belts, filter cloth, seat belts, tents, bags, sails, medical bandages.
Each use asks for different properties: soft for towels, strong for seat belts, flame-safe for curtains in public halls.
Apparel manufacturing
- Design and sample. A designer sketches, a sample garment is made, buyers approve it.
- Pattern making. Paper patterns are made for each size. Grading makes the pattern bigger or smaller for other sizes.
- Marker and cutting. Pattern pieces are laid on the fabric to waste as little cloth as possible (the marker). Many layers are spread and cut together.
- Sewing. Pieces are joined in order by workers or machines, each doing one part (a sewing line).
- Finishing. Threads are trimmed, the garment is pressed, checked, folded, tagged and packed.
Quality is checked at several steps, not only at the end.
Quality testing and control
Quality testing measures a property. Quality control uses these results to keep products within the rules.
- Strength: pull a strip until it breaks and note the load (tensile test).
- Colour fastness: rub, wash or put in sunlight and see if colour fades or stains other cloth.
- Shrinkage: measure before and after washing.
- Others: abrasion (wear), pilling, seam strength, size and weight of fabric.
In control, a small sample from each batch is tested. If too many fail, the batch is held back and the cause is fixed. Labels with fibre content and care symbols give the buyer this information.
Traditional textiles
Many regions keep old textile skills. Some well-known Japanese examples:
- Kasuri: threads are tied and dyed before weaving, so a soft, blurred pattern appears in the cloth (like ikat in India and Indonesia).
- Shibori: cloth is folded, tied or stitched before dyeing, so tied parts stay light (like tie-dye or bandhani).
- Indigo dyeing (ai-zome): a plant dye that turns cloth deep blue.
- Nishijin-ori: rich patterned silk woven in Kyoto.
- Yuzen: painted designs on silk using a paste that blocks dye.
These crafts are slow and need skill, so each piece is valued. They are kept alive by teaching young makers and by modern designs.
Try it
In the 3D, pull the strip with the load slider and find the breaking point. Then pick stripes, checks or dots. At home, read the care label of three clothes and write fibre and symbol. Fold and tie a cotton cloth with rubber bands and dip it in diluted tea or food colour to make a shibori-style pattern (ask an adult).
Key formulas and definitions
- Fabric (primary) → cut and sewn → product (secondary)
- Apparel line: design → pattern → cut → sew → finish
- Pass if load ≤ breaking load; fail if load > breaking load
- Shrinkage % = (old length − new length) ÷ old length × 100
Worked examples
1. Put these in two groups, primary or secondary: yarn, bedsheet, cotton cloth roll, school shirt.
Primary: yarn, cotton cloth roll. Secondary: bedsheet, school shirt (made by cutting and sewing fabric).
2. A 50 cm piece of cloth is 47 cm after washing. Find the shrinkage percent.
Shrinkage = (50 − 47) ÷ 50 × 100 = 3 ÷ 50 × 100 = 6 percent.
3. A seat belt strip must hold at least 20 kN. Tests give 24, 22 and 19 kN. Which pass?
24 and 22 pass because they are 20 or more. 19 fails because it is below 20.
4. A cutter spreads 40 layers and cuts a pattern for 3 shirts in one marker. How many shirts are cut at once?
3 shirts per layer × 40 layers = 120 shirts.
Common mistakes
- Calling fabric a secondary product. Fabric is primary; secondary products are made from it.
- Thinking quality control is only a final check. It happens at many steps, and uses samples.
- Mixing up testing and control. Testing measures; control uses the results to decide and fix.
- Saying kasuri is dyed after weaving. In kasuri the threads are dyed before weaving.