Most common asked QUESTION & ANSWER ON QUALITY CONTROL IN FLEXIBLE PACKAGING.
1. What is flexible packaging?
Ans: – Flexible packaging is type of packaging, which is easy bent, fold stretched without breaking.
2. What is benefit of flexible packaging?
Ans: – Easy to convenience, cost effective, easy customized, product protection.
3. What’s are raw the materials used in flexible packaging Industries?
Ans: – PET, BOPP, PAPER, ALLUMINIUM FOIL, LDPE, HDPE, LLDPE, CPP, BOPA, INK, CORE, CORRUGATED BOX, ADDITIVES, ADHESIVE & HARDNER, SOLVENTS, GRAVURE CYLINDER, FLEXO PLATE etc.
4. Which type product can be packed in flexible packaging?
Ans: – Food products, pharmaceutical products, Garments products, Grocery products, Cosmetics products, Liquid packaging etc.
5. What is density of Aluminum foil?
Ans: – 2.71 gm/cm3
6. What is the process color?
Ans: – Cyan, Magenta, Yellow, Black.
7. Which material has highly barrier properties.
Ans: – Aluminum foil.
8. Which material is high transparency.
Ans: -PET>BOPP>PP>CPP>LLDPE>LDPE>HDPE.
9. What is tensile strength of Polyester films.
Ans: – 2000 – 2200 kg/cm2.
10. What is the unit of Corona treatment.
Ans: – Dyne/cm
11. What is the process in flexible packaging Industries.
Ans: -Designing, Printing, Inspection, Lamination, Extrusion coating lamination, Slitting, folding, Rewinding, Pouching.
12. What is solid content of solvent less adhesive.
Ans: – 100 %
13. How much treatment in Aluminum foil.
Ans: – 72 Dyne/cm.
14.How much time required for laminate material.
Ans: – Min 24 Hrs. required. It’s also depended on material thickness, Environment temperature, Adhesive properties etc.
15. What is blow up ratio in blown film?
Ans: – It is defined as ratio of Diameter of bubble & diameter of die. It improves the mechanical properties of film quality like Dart impact, tensile strength, Clarity etc. Generally, blow up ratio is 2.0 – 4.0 .
16.What is basic machine operating parameter in slitting machine.
Ans: – Unwinder tension, Rewinder tension, Lay on pressure, taper tension, machine speed.
17. 10 Major defects in blown film extrusion.
Ans: – GSM Variation, wrinkles, Crease, melt fracture, Gels particles, burn particles, die line, Treatment fail, loose winding, Statics.
18. 20 Major defects in Gravure & Flexo printing.
Ans: – Shade variation, Miss registration, Miss print, cell filing, Mottling, blade line, Scum, ink spot, tape test fail, ink setoff, Cylinder worm out, low opacity, tail line, Mottling, gear mark, dent, repeat length variation.
19. 10 Defects in Extrusion coating lamination.
Ans: – Low bond strength, poly missing, repeat length variation, patch, Gsm variation, mica not dry, die line, Curling, Crease.
20. How many types of test conduct in blown film?
Ans: – Tensile strength, Elongation, Seal strength, Dart impact, tear strength, treatment, Coefficient of friction, Opacity, GSM, Haze, Transparency, etc.
21. Which material has low tearing strength.
Ans: – Bopp (Bopp<pet<nylon<cpp<poly)
22. Top 10 defects in solvent base & solvent less lamination.
Ans: – Low bond strength, tackiness in laminate, curling, adhesive line, corrugation, speckling, Cof increase, Blisters, delamination, solvent retention, crease, Piping, Blocking.
23. Top 10 defects in Slitting?
Ans: – Out slitting, rough slitting, poor winding, telescope, improper joint, loose winding, wrong direction, use wrong color tape, core impressions, incorrect roll OD etc.
24. Most Common additive use in blown film.
Ans: – PPA, Slip, Antilock, Antistatic, Color master batch, Optical brightener.
25. How many types of polyester film generally use in flexible packaging.
Ans: – Chemical pet, Corona pet, Plain pet, plasma pet, Alox pet, Pvdc pet.
26. How many types of lamination process are in flexible packaging.
Ans: – Solvent less, Solvent base, Heat seal lamination, Cold seal lamination, Extrusion coating lamination.
27. What is solvent use in printing department.
Ans: – Ethyle acetate, toluene, MEK, PM, Ethanol, IPA, Ethyle cello solve.
28. Top 15 Quality control instrument in flexible packaging industries.
Ans: – Gauge meter, Dart impact tester, U.T.M machine, C.O.F tester, Opacity tester, Heat sealer, Hot tack, Gas chromatography, WVTR & OTR tester, Hot oven, Core bursting tester, Weighs balance, Spectrometer, Light box, Vacuum leak teaser, Water leaker tester.
29. What is process parameters in lamination machine.
Ans: – Unwinder tension, Rewinder tension, web bridge tension, Taper tension, NCO & OH temperature, nip pressure, Nip temperature, Nco & Oh pressure, Adhesive viscosity, Machine speed, doctor blade pressure, Layon pressure.