Define the layer stack before asking for a price
The first RFQ error is writing only “260gsm waterproof fleece blanket”. One supplier may quote 260gsm finished composite; another may quote 260gsm fleece plus TPU and adhesive. A workable line is: “260gsm ±5% 100% polyester polar fleece face before lamination, brushed and sheared face side, 10–25µm TPU film, hot-melt dot or web lamination, finished 2-layer composite target 280–315gsm after ISO 139 conditioning.”
State whether TPU is the exposed back layer or an internal membrane. A true 2-layer fleece + TPU blanket has fleece on one side and TPU film on the other. It is lighter, thinner and cheaper to pack, but the exposed film can scuff, block against itself in warm cartons, pick up dirt, puncture on stones and feel tacky on painted benches. For picnic ground use, many buyers are better served by fleece + TPU + 190T/210D polyester or oxford backing, even though it adds weight, sewing bulk and cost. For related picnic constructions, compare PEVA, PU and TPU backing options and 190T shell picnic blanket constructions.
Face fabric should be specified before lamination: yarn such as 75D/144F or 100D/144F polyester, knit type, pile side, anti-pilling target, colour standard, recycled-content claim if any, and whether the bonding side is brushed or left flatter. Open fleece can allow adhesive strike-through and a harsh hand. Dense fleece improves warmth and surface stability but can reduce WVTR and make a rain-wrap format feel clammy.
Use a sourcing decision rule instead of one universal construction. Choose 2-layer exposed TPU for light stadium wraps, car-emergency blankets, low-bulk travel blankets and price-sensitive promotional goods where the back is not dragged across rough ground. Choose 3-layer backed construction for picnic mats, pet blankets, rental/event stock and retail programmes with higher warranty risk. Choose thicker oxford or woven backing if the product will be walked on, folded onto gravel, or packed wet by consumers.
Choose the TPU grade deliberately
TPU is not one material. Polyester-based TPU normally gives better heat resistance, oil resistance and dimensional stability, and it is common for general blanket lamination. Polyether-based TPU generally gives better hydrolysis resistance and low-temperature flexibility, which matters for damp storage, marine use, snow events or long warranty claims. Polyether grades usually cost more and can feel softer or slightly tackier depending on formulation.
For exposed-back blankets, ask the film supplier or laminator to state TPU chemistry, thickness, melting range, Shore hardness where available, colour/clarity, anti-block additive, hydrolysis-resistance grade and low-temperature flexibility grade. Do not approve only by “10µm TPU” or “breathable TPU”; the same thickness can behave very differently in cold flex, blocking and peel after ageing.
For low-temperature use, specify a performance check rather than relying on grade names. A practical retail target is no cracking, whitening, pinholes or delamination after conditioning at 0–5°C for 2 hours and folding 20 cycles over a 25mm radius. For ski, winter-event or vehicle-emergency claims, test at -10°C or -20°C before approving packaging copy. Higher hydrostatic head from a thicker film is not useful if the film crackles loudly, creases permanently or splits at fold lines.
Condition samples before testing fabric properties
Fleece relaxes after knitting, brushing, lamination and packing. Moisture also changes mass and peel readings. Write conditioning into the RFQ so the supplier and third-party lab do not test fresh, warm fabric straight from the line. For GSM, hydrostatic head, WVTR and peel strength, condition specimens at 20 ±2°C and 65 ±4% RH for at least 24 hours where practical, using ISO 139 as the conditioning reference.
For production control, keep two retained standards: one full approved blanket and one uncut bonded fabric swatch, both sealed, dated and signed. Bulk QC should compare handfeel, noise, pile appearance, back-film appearance, edge build, folding recovery, odour and blocking against these standards. If a fabric roll is vacuum-packed or tightly rolled, let it relax 12–24 hours before final measurement and cutting; otherwise finished size and edge curling can move after sewing.
Specify test direction and test face. Peel strength should report machine direction and cross direction. Hydrostatic head should be tested on the finished composite with water pressure applied from the TPU side unless the claim requires the opposite. WVTR must use one named method and condition throughout the programme. Film data alone is not enough because adhesive coverage, fleece density and backing fabric alter the finished result.
Set waterproof and WVTR targets by end use
Hydrostatic head must apply to the finished laminated composite, not only to the TPU film. ISO 811 is a suitable reference for comparing bulk lots, but the number does not predict puncture, scuffing or stitched-edge leakage. For a blanket laid on damp grass, 3,000–5,000mm finished-composite hydrostatic head is often practical. For a stadium wrap, dog blanket or car-emergency blanket exposed to longer wet contact, 5,000–8,000mm may be justified if handfeel and cold flex still pass.
Do not push high water resistance into every product. A 10–15µm TPU film usually gives softer drape and lower rustle, with finished hydrostatic head often around 2,000–4,000mm depending on adhesive and fleece. An 18–25µm film supports 3,000–8,000mm more reliably, but adds stiffness, cost and cold-crackle risk. If the intended claim is only “water-resistant backing for damp grass”, a moderate target with better abrasion and seam performance may outperform a thin high-HH film in field use.
Breathability must be method-linked. Example PO language: “WVTR ≥3,000 g/m²/24h by ASTM E96/E96M Procedure BW, 23°C, 50% RH, water method, reported on finished composite” or “WVTR ≥5,000 g/m²/24h by JIS L 1099 B1, 40°C, 90% RH, potassium acetate method, reported on finished composite.” These methods are not interchangeable. A result of 6,000 g/m²/24h by JIS L 1099 B1 may not equal 6,000 g/m²/24h by ASTM E96 upright cup.
For picnic blankets, a lower WVTR such as 1,000–3,000 g/m²/24h by ASTM E96 may be acceptable if hydrostatic head, abrasion and edge leakage are controlled. For rain-wrap, poncho or wearable formats, target higher WVTR by the selected method and run a wear trial because condensation complaints appear quickly. For poncho-related construction risks, see fleece poncho blanket pattern and snap details.
Use a buyer specification table in the PO
| Item | Typical buyer target | Method or control | Acceptance note |
|---|---|---|---|
| Face fleece GSM | 260gsm ±5% before lamination | ISO 3801 or ASTM D3776 after ISO 139 conditioning | Test each fleece lot before bonding |
| Finished composite GSM | 280–315gsm or PO tolerance ±7% | ISO 3801 or ASTM D3776 after conditioning | Check left, centre and right across width |
| TPU thickness | 10–25µm, chemistry and grade stated | ISO 4593 or film COA plus spot gauge check | Film roll labels must match approved grade |
| Adhesive add-on | Typically 8–18gsm depending on hand and peel target | Supplier recipe sheet and weight control | No strike-through, hard patches or powder shedding |
| Hydrostatic head | 3,000–5,000mm damp-ground; 5,000–8,000mm higher claim | ISO 811 on finished composite | Test every lamination lot if waterproof claim is used |
| WVTR | Method-specific target, e.g. ASTM E96 BW ≥3,000 or JIS L 1099 B1 ≥5,000 g/m²/24h | One named method and condition only | Retest if film, adhesive or lamination recipe changes |
| Peel before wash | ≥6 N/25mm; ≥8 N/25mm for warranty-critical retail | ISO 11339 or ASTM D903 adapted, 180° peel | Condition 24 hours after lamination before testing |
| Peel after wash | ≥5 N/25mm after 1 wash; ≥4 N/25mm only for light-use promos | ISO 6330 30°C gentle wash, line dry, then 180° peel | No bubbling, edge lift or film cracking |
| Peel after cold flex | ≥5 N/25mm after agreed cold-flex cycle | 0–5°C, or lower if claimed, then 180° peel | No whitening, cracking or delamination |
| Stitched-edge leakage | No visible water ingress through stitch line after agreed exposure | Adapted spray, puddle or low-pressure edge test | Required for bound or quilted goods with waterproof claims |
| Shrinkage | Within ±3% after one gentle wash if washable | ISO 6330 and ISO 5077 | State wipe-clean only if washing is not allowed |
| Pilling face side | Grade 3–4 minimum after 2,000 cycles | ISO 12945-2 | Retail programmes may need stricter approval |
| Abrasion if TPU exposed | No film-through failure or pinholes at agreed cycles | ISO 12947-2 or ASTM D4966 adapted | Test TPU side against abrasive cloth |
Attach this table to the RFQ and convert it into the PO. Define which results must come from a third-party lab and which can be mill-lab controls. Hydrostatic head, WVTR, peel strength, stitched-edge leakage and cold flex should be approval-critical if the sales copy uses waterproof, breathable, winter, camping or stadium language. For broader inspection structure, use a finished-goods checklist such as blanket quality control inspection and add laminate-specific checks.
Control lamination recipe and change approval
TPU lamination is a process window. Too little heat or pressure gives fibre-tip bonding and weak peel after folding. Too much heat can shrink or haze TPU, flatten pile, yellow pale colours, close vapour pathways or create a boardy hand. For polyester polar fleece with hot-melt web or dot adhesive, development settings often fall around 110–135°C at the heated roll surface, but the correct value depends on film grade, adhesive chemistry, dwell time and pile thickness.
During sampling, record top roll temperature, lower roll temperature if heated, line speed, nip pressure, adhesive type, adhesive add-on in g/m², fabric pre-drying condition, roll cooling method and ageing time before slitting. Development line speed is often slower than bulk, roughly 8–18m/min for heavier fleece. If bulk production runs faster than sampling, retest peel and handfeel from roll edge, centre and opposite edge before cutting.
Put change control in the PO: “Supplier to maintain approved lamination recipe; any TPU film grade or thickness change, adhesive type or add-on change, temperature change above ±5°C, line speed change above ±10%, nip-pressure change, fleece supplier change, backing supplier change or recycled-content change requires buyer approval and renewed testing.” This prevents a common failure: the hand sample passes, but bulk uses a cheaper film or faster line and delaminates at folds or sewn edges.
After lamination, allow bonded rolls to cool and age before tight winding, slitting and cutting. For many hot-melt systems, 24 hours is a practical minimum before final peel testing and bulk cutting; some adhesive systems need longer to stabilise. If rolls are cut too warm, layers can block, crease and develop roll-set marks that do not relax during sewing.
Test peel strength with a defined adaptation
Peel strength should be tested as a 180° peel, adapted from ISO 11339 or ASTM D903, reported in N/25mm with direction stated. Use 25mm-wide specimens where the laminate structure allows; if using 50mm strips, report the converted value clearly as N/25mm. A practical set is 5 specimens in machine direction and 5 in cross direction per lamination lot or per colour/film combination, with the average and minimum value reported.
Use a constant-rate tensile tester with jaw speed stated, commonly 100mm/min or 300mm/min. Keep the same speed throughout the programme because peel readings change with rate. Clamp the TPU or backing layer in one jaw and the fleece layer in the other, then peel at 180°. If the TPU is too elastic to clamp consistently, support it with a thin non-stretch backing tape outside the peel zone and record the adaptation. Do not tape across the bonded interface being measured.
Record failure mode for every strip: adhesive failure between TPU and adhesive, adhesive failure between fleece and adhesive, cohesive split within adhesive, fleece fibre tear, TPU film tear, or mixed failure. A low N/25mm adhesive failure predicts delamination complaints. A higher value with fleece tear may be acceptable, but it can also mean the bond is stronger than a weak fleece base. Film tear can indicate good adhesion or a brittle/overheated film; check cold flex and pinholes before approving.
For a washable outdoor retail blanket, a workable acceptance set is: before wash after 24-hour conditioning, average ≥6 N/25mm and no individual below 5 N/25mm; after one ISO 6330 30°C gentle wash and line dry, average ≥5 N/25mm and no individual below 4 N/25mm; after cold flex, average ≥5 N/25mm. For premium or warranty-sensitive programmes, ask for ≥8 N/25mm before wash and ≥6 N/25mm after wash/cold flex if handfeel remains acceptable. A lower 4 N/25mm after one gentle wash should be limited to light-use promotional goods.
Specify seams, quilting and edge leakage
A laminated panel can pass ISO 811 and still fail as a finished blanket because stitching punctures the membrane, binding channels water and needle heat damages film near the edge. Any waterproof or water-resistant claim should include finished-edge testing, not only lab data from the unsewn roll.
For bound edges, specify binding width, material and stitch density. Common fleece or polyester binding widths are 20–30mm finished. A typical lockstitch or overlock setting is 8–11 stitches per inch, but the correct density depends on binding thickness and needle size. Too many stitches create a perforation line; too few stitches allow the binding to gape and wick water. Needle choice should avoid cutting the film: many factories use ballpoint or light ballpoint needles for fleece, with size adjusted after seam trials rather than fixed blindly.
For quilting or tack points, decide whether waterproof integrity is still claimed. Every quilt line penetrates the TPU unless ultrasonic or adhesive bonding is used. If stitched quilting is needed to control layer shift, keep quilting away from high-water-contact zones or use a 3-layer construction where leakage is acceptable for the intended claim. For picnic mats with wadding, review when ultrasonic quilting is suitable in ultrasonic quilting for picnic blankets.
Add a simple finished-edge leakage test for production. Example: lay the finished blanket TPU side down over absorbent paper, create a 100mm-wide water contact zone across each edge and one corner, hold 300–500ml water for 30 minutes at room temperature, then check the paper and fleece face. Pass means no continuous wet line through the stitch path and no corner pooling that reaches the face side. This is not a substitute for ISO 811, but it catches the failure customers see first.
For exposed TPU edges, avoid raw film edges where possible. Use bound edges, turned edges or overlocked edges with enough bite to prevent film/fleece separation. For heavy-duty retail, add seam-strength checks: ASTM D5034 grab strength or an agreed seam pull test, with no seam opening, binding tear or laminate split under the buyer’s load target. Stadium and emergency blankets have different edge risks; compare edge requirements in seam-strength targets for fleece stadium blankets.
Make handfeel, blocking and cold crackle inspectable
Softness and noise cannot remain subjective. Keep an approved sealed blanket and bonded fabric swatch as golden samples. During inline and final QC, flex a 30 x 30cm sample at room temperature and compare stiffness, rustle, surface drag and recovery. If the TPU is exposed on the back, also check blocking: fold TPU-to-TPU and TPU-to-face under light pressure at 40°C for 4 hours, then open. Reject if surfaces stick, transfer, mark heavily or pull pile.
Use clear cold-crackle language. A practical check is: condition the bonded fabric at 0–5°C for 2 hours, then within 2 minutes fold it 10 times along the machine direction and 10 times across the machine direction over a 25mm radius. Pass means no visible film whitening, cracking, delamination, pinholes, permanent crease, or noise increase judged clearly louder than the approved golden sample. After 30 minutes at room temperature, the fold line should relax without film fracture or edge lift.
For winter retail claims, run a stricter trial before confirming packaging copy: -10°C to -20°C conditioning if the product will be sold for ski, car-emergency or outdoor-event use. Not every TPU grade remains quiet at those temperatures. A 25µm film may be correct for water resistance but wrong for a soft stadium blanket if the buyer’s main complaint risk is plastic noise.
Set lot-level test frequency
Define test frequency by stage, not only by shipment. At development, test every candidate construction: face fleece lot, TPU grade, adhesive recipe, hydrostatic head, WVTR, peel before/after wash, cold flex, blocking and finished-edge leakage. At pre-production, test the approved colour and one dark/high-risk colour if the range includes navy, black, red or saturated prints that may alter heat absorption or handfeel.
During bulk lamination, a practical minimum is one peel and visual laminate check per lamination roll, plus hydrostatic head at least once per lamination lot, colour lot or 3,000–5,000 metres, whichever is more conservative for the order size. For small orders, test at least one set from the first roll and one set from the final roll. For larger orders, sample beginning, middle and end of the run, and include left/centre/right width positions.
At finished-goods stage, test size, unit weight, edge leakage, seam integrity, blocking, odour, barcode/label and packing on the inspection sample. If the shipment combines multiple colours or sizes, sample each SKU. If one SKU fails hydrostatic head, peel or edge leakage, do not release the whole shipment by averaging; quarantine the related roll numbers and trace which finished blankets used that fabric.
Keep retained swatches from each lamination lot and finished shipment for at least the warranty period agreed with the buyer, or at minimum 6–12 months for seasonal retail programmes. Retained samples should show roll number, colour, film batch, adhesive batch, lamination date, operator/line and carton range. Traceability is cheap compared with sorting a mixed container after a delamination claim.
Build AQL around laminate failure modes
Use ISO 2859-1 / ANSI/ASQ Z1.4 sampling with the inspection level and AQL written in the PO. A common retail setting is General Inspection Level II with AQL 2.5 for major defects and 4.0 for minor defects; critical defects should be AQL 0 or not allowed. Buyers with strict marketplace or club-store requirements may choose tighter AQL 1.5 major / 2.5 minor, but the price and rework risk should be understood.
Classify laminate issues clearly. Critical: sharp contamination, mould, unsafe odour, wrong fibre/claim label, missing warning label where required, or illegal chemical claim. Major: delamination larger than 10mm, edge lift, pinholes visible against light, stitched-edge leakage, wrong size outside tolerance, wrong barcode, blocked TPU surfaces, film cracking, severe colour shade mismatch, missing carry strap or wrong packing. Minor: small surface crease, slight pile pressure mark, loose thread under agreed limit, minor print/label skew, or carton scuff not affecting sale.
Set finished blanket tolerances. Typical buyer controls are finished size ±2% or ±3cm, whichever is larger; unit weight ±7% unless a tighter retail spec is agreed; rectangularity difference between diagonals within 2–3cm for medium throws; binding width tolerance ±3mm; stitch density within ±1 stitch per inch against approved sample; no skipped stitch run longer than 20mm; no needle holes outside seam allowance on exposed TPU.
Inspection should include delamination zones: all four corners, fold lines, carry-loop attachment points, label areas, quilting/tack points, bound edges and any heat-sealed or embossed logo area. Check pinholes by holding the TPU side over a light table or bright lamp in a darkened area. Check odour after sealing one blanket in a clean polybag for 2 hours at room temperature; strong solvent, sour, mouldy or burnt-plastic odour should trigger quarantine.
Packing checks should cover carton compression, barcode scan, SKU/colour/size label, care label, country-of-origin marking, polybag suffocation warning where required, carton drop resistance if e-commerce, and carton burst strength or edge crush where specified. For AQL structure on fleece programmes, the logic is similar to AQL 2.5 inspection for promotional fleece blankets, with extra laminate and edge-leakage checks.
Control packaging and storage
Exposed TPU can block, crease, yellow or transfer under heat and pressure during container shipping. Avoid packing TPU-to-TPU under heavy compression unless anti-block performance has been tested. If the blanket is folded with TPU touching TPU, insert tissue, nonwoven interleaf or fold so fleece contacts TPU instead. Do not use printed inserts that can transfer ink onto warm TPU unless rub and heat-transfer tests have passed.
Vacuum compression reduces CBM but increases crease memory, blocking and edge stress. If compression is required, run a 7-day packed trial at 40°C and then inspect blocking, odour, film marks, crease recovery, peel at folds and barcode legibility. For heavy pile blankets, CBM savings can be meaningful, but TPU-laminated constructions need more caution than ordinary fleece. For general CBM logic, compare vacuum-compressed blanket costing risks.
Cartons should not be overfilled. A practical packing control is to define pieces per carton, folded size, carton internal size, gross weight limit and stack height. Keep carton gross weight within the buyer’s warehouse handling limit, often below 15–20kg unless agreed. Use moisture-resistant outer cartons for long sea freight, and avoid direct contact between desiccant bags and exposed TPU film.
Storage controls should state: store cool and dry, avoid direct sunlight, avoid long-term pallet compression, keep away from heat sources, and do not store folded TPU under load for months before dispatch. If the product is made for a seasonal launch, ask the factory when goods will be packed versus shipped; early packing in July for autumn retail can create blocking problems before the container leaves.
Check compliance before making claims
Chemical compliance depends on destination and user group. For EU/UK retail, buyers commonly require REACH restricted-substance compliance, including SVHC review current at shipment date. For US retail, review California Prop 65 exposure risk, especially for coatings, dyes, plastic packaging, inks and trims. If the blanket may be used by children, CPSIA requirements may apply in the US; do not treat it as an adult outdoor throw without confirming age grading, labels and small-part risks.
OEKO-TEX STANDARD 100 can be useful for textile confidence, but scope matters. The certificate must cover the actual supplier, product class, fabric/film/adhesive/trim scope and validity period. Do not claim certification from a yarn or fabric certificate alone if the laminated finished blanket is outside scope. For buyer-side certificate checks, see OEKO-TEX Class II versus Class I requirements.
PFAS-free or PFC-free water-repellency claims need substance control, not only a marketing statement. TPU itself is not a fluorocarbon DWR, but face-fabric finishes, stain repellents and aftermarket sprays can introduce PFAS risk. If the product claims PFAS-free, request a restricted-substance declaration and targeted lab testing appropriate to the market. For C0 water-repellent language, compare PFC-free water-repellent finish controls.
If recycled polyester is claimed, define whether recycled content is in the fleece, backing, sewing thread, binding or all components. Request transaction certificates where a chain-of-custody standard is claimed, and match claim percentage to BOM weight. Do not write “100% recycled blanket” if the TPU film, adhesive, labels, binding or thread are virgin. For documentation workflow, use the same discipline as rPET polar fleece blanket documentation and GRS transaction certificate workflow.
Write PO clauses that prevent disputes
Useful PO wording is specific and testable: “260gsm ±5% polyester polar fleece face weight before lamination; TPU film 18µm nominal, polyester/polyether grade stated; hot-melt dot adhesive 8–18gsm; finished composite 290–310gsm after ISO 139 conditioning; hydrostatic head ≥5,000mm by ISO 811 on finished composite; peel ≥6 N/25mm before wash and ≥5 N/25mm after one ISO 6330 30°C gentle wash; no stitched-edge leakage under agreed edge test.”
Add construction clauses: “Finished size 150 x 200cm ±3cm; bound edge 25mm finished width ±3mm; stitch density 8–11 SPI; no skipped stitch run over 20mm; no raw exposed laminate separation; corner reinforcement required if carry straps or loops are sewn through laminate.” If the blanket has straps, snaps or a pouch, test those parts under load because they create concentrated stress in the laminate.
Add inspection and traceability clauses: “Final inspection to ISO 2859-1 General Inspection Level II, AQL 2.5 major / 4.0 minor unless otherwise agreed; critical defects not allowed. Supplier to provide roll-to-carton traceability, film batch, adhesive batch, lamination date, test records and retained swatches for each lamination lot.”
Add change-control and compliance clauses: “No substitution of TPU grade, film thickness, adhesive chemistry, fleece supplier, backing supplier, colour recipe, recycled-content source, packing method or lamination settings beyond agreed tolerance without buyer approval and renewed testing. Supplier to provide REACH/SVHC declaration, applicable Prop 65 review, OEKO-TEX scope evidence if claimed, PFAS-free support if claimed, and recycled-content documentation if claimed.”
For Incoterms, define what the price includes. EXW leaves inland handling, export clearance and local charges to the buyer; FOB Ningbo/Shanghai typically includes export clearance and delivery on board; CIF adds main freight and insurance but not destination clearance; DDP transfers more landed-cost responsibility to the seller but requires clear HS code, duty and tax assumptions. For freight planning, the same costing discipline used in custom blanket lead times and shipping applies, but TPU-laminated goods need extra care on compression and heat exposure.
Frequently asked
Is 260gsm the finished weight of a TPU bonded fleece blanket? Not necessarily. In a proper RFQ, 260gsm should state whether it is the face fleece weight before lamination or the finished composite weight. For 260gsm face fleece plus 10–25µm TPU and 8–18gsm adhesive, the finished 2-layer composite is often around 280–315gsm after conditioning.
What hydrostatic head should I specify for a fleece + TPU blanket? For damp grass use, 3,000–5,000mm by ISO 811 on the finished composite is often practical. For stronger waterproof claims, stadium wraps or pet/car use, 5,000–8,000mm may be justified. Also test stitched-edge leakage because sewing holes can fail even when the flat laminate passes ISO 811.
How should peel strength be tested? Use a 180° peel adapted from ISO 11339 or ASTM D903, normally on 25mm-wide strips, with jaw speed stated and kept consistent. Test at least 5 specimens in machine direction and 5 in cross direction per lamination lot or colour/film combination. Report average, minimum and failure mode: adhesive, cohesive, fleece tear, TPU film tear or mixed failure.
What peel strength target is reasonable? For washable outdoor retail goods, use at least 6 N/25mm before wash and 5 N/25mm after one ISO 6330 30°C gentle wash and line dry. Premium or warranty-sensitive programmes may need 8 N/25mm before wash and 6 N/25mm after wash or cold flex. A 4 N/25mm post-wash minimum is better limited to light promotional use.
Should I choose polyester TPU or polyether TPU? Polyester TPU is common for general lamination and often gives good heat and dimensional stability. Polyether TPU usually gives better hydrolysis resistance and low-temperature flexibility, which helps in damp storage, snow use or longer warranty programmes. Confirm performance by cold-flex, blocking, peel and hydrostatic testing rather than grade name alone.
Can a 2-layer exposed TPU blanket be used for picnics? It can be used for light damp-ground protection, but exposed TPU is vulnerable to puncture, scuffing, blocking and dirt pick-up. For picnic mats dragged across grass, sand or gravel, a 3-layer construction with a textile backing over the TPU usually reduces warranty risk, although it adds weight and cost.
Which WVTR method should be written into the PO? Choose one method and condition, then keep it for approvals and bulk monitoring. ASTM E96/E96M Procedure BW and JIS L 1099 B1 can give different results and should not be mixed. State the target as method-linked, such as ASTM E96 BW ≥3,000 g/m²/24h or JIS L 1099 B1 ≥5,000 g/m²/24h on the finished composite.
What AQL level is typical for finished TPU bonded blankets? A common retail setting is ISO 2859-1 General Inspection Level II with AQL 2.5 for major defects and 4.0 for minor defects, with critical defects not allowed. Major defects should include delamination, pinholes, stitched-edge leakage, blocking, wrong size, wrong barcode, severe odour and film cracking.
How often should bulk lamination be tested? At minimum, check peel and visual laminate quality per lamination roll, and test hydrostatic head at least once per lamination lot, colour lot or 3,000–5,000 metres, whichever is more conservative. For larger runs, sample beginning, middle and end, including left, centre and right width positions.
What packaging controls matter for exposed TPU? Avoid heavy TPU-to-TPU compression unless anti-block testing has passed. Use interleaf or fold fleece-to-TPU where possible, run a 40°C packed trial for compression programmes, control carton fill, keep cartons away from heat and sunlight, and do not store folded TPU under load for long periods before shipment.
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