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How an insulated non-woven cooler bag is actually built: metallised film versus true aluminium foil liners, EPE and XPE foam, a welded liner inside a sewn shell, closures, condensation, and the four bench tests to run before approving a sample.
Inside non-woven bag production: PP pellets, spunbond forming, masterbatch colour, screen vs gravure print routes, bag making, QC gates and packing.
How ultrasonic welding and stitching join non-woven bags: weld settings, real limits, hybrid handle roots, pull and peel tests, and how to spec the seam.
Width x Height x Gusset explained: measurement datums, tolerances, gusset types, worked sizing examples and the spec sheet fields that prevent disputes.
What BOPP lamination adds to spunbond polypropylene, what it costs in weight, price and end of life, and how to decide which one your bag needs.
Compare RPET, cotton, kraft paper and plant-starch film, with order-specific claim evidence and certificate checks for bag buyers.