PEC EPE Textile case studies
PEC EPE Textile · Put your knowledge to work in context.
The Engineering Practice Examination (EPE) is a professional assessment administered by the Pakistan Engineering Council (PEC), the statutory body that regulates the engineering profession in Pakistan. For Textile Engineering candidates, the EPE is the practice-oriented step that sits alongside the registration framework PEC maintains for engineers, and it is most relevant to graduates and practising engineers who need to demonstrate that their academic training translates into sound engineering judgement. The PEC EPE Textile case studies are 5 cases and about 3,620 words.
1Ring-Spinning End Breakage After Cotton Lot Change
A 25,000-spindle ring-spinning mill is running 30 Ne carded knitting yarn at 15,500 rpm, 42 mm rings, 19.5 TPI, and 55% RH. After switching to a new cotton lot (micronaire 4.7, strength 29 g/tex, short-fibre index 11.8%, neps 280/g), end breakage rose from 18 to 42 per 1,000 spindle-hours.
785 words, about 4 min2Sizing Recipe Cost Reduction and Loom Efficiency Loss
A weaving mill runs 240 air-jet looms at 700 picks/min on 100% cotton poplin, 40s x 40s, 133 x 72, 63 in width. To cut sizing cost, the size recipe was changed from 70% PVA/30% modified starch to 40% PVA/60% modified starch, and size add-on was reduced from 12.0% to 9.5%.
682 words, about 3 min3Reactive Dye Shade Failures After Salt Supplier Change
A dyehouse batch-dyes 100% cotton single jersey, 220 g/m2, in 600 kg jet machines using exhaust reactive dyes. In the last 20 lots, 8 have failed shade approval with Delta E 1.1-2.1 against a tolerance of 1.0.
740 words, about 4 min4Needle-Punched Geotextile Failing CD Strength and AOS
A needle-punched nonwoven line produces 300 g/m2 polyester geotextile for landfill liner protection from 6.7 dtex virgin PET, needle density 180 punches/cm2, needle depth 12 mm, line speed 4.5 m/min, working width 2.5 m. The specification requires grab tensile at least 700 N in both MD and CD, CBR puncture at least 2,200 N, trapezoid tear at least 250 N, apparent opening size (AOS) no more than 0.15 mm, and permittivity at least 1.0 s-1.
709 words, about 4 min5Knit Garment Shrinkage After a Pre-Shrunk Fabric Claim
A garment manufacturer buys 100% cotton single jersey, 160 g/m2, 30s combed, tubular, for a 50,000-piece order. The customer requires after three home launderings at 40 C: length shrinkage no more than -5.0% and width no more than -4.0%.
704 words, about 4 min