Buyer spec table: what to lock before sampling
Use one approved technical sheet before the pilot lot. In berber throws, the same commercial name can hide different constructions: loop-pile knit, raised polyester knit, sherpa-style brushed fleece, or spun-look yarn finished into a curled face. The purchase order should define whether GSM applies to face fabric only, finished fabric including back treatment, or complete throw including binding and labels. If the document mixes those definitions, the supplier and buyer can both be technically right and still reject the goods.
For a 340gsm high-loft polyester berber throw, we normally recommend controlling finished fabric before cut-and-sew, then separately controlling finished throw weight and packing recovery. The ranges below are practical starting points. They are not universal standards; validate them against the exact yarn count, knit structure, coating chemistry, dye route, decoration and pack format used in the pilot lot.
| Control item | Recommended buying target | Method notes | | --- | --- | --- | | Finished fabric mass | 340gsm ±5% | Use ISO 3801 for textile fabric mass per unit area or ASTM D3776/D3776M if your lab works to ASTM. Condition specimens before testing. Exclude binding, labels, hangtags and packaging unless the PO separately defines finished throw weight. | | GSM specimen plan | Minimum 5 specimens per colour/lot; 100cm² or larger cutter where possible | Condition at 20 ±2°C and 65 ±4% RH for at least 24h, or state the buyer-approved conditioning alternative. Cut away from selvedge, seams, crushed roll edges and obvious defects unless testing defect investigation. | | Apparent pile height | Usually 6-10mm for high-loft berber face | Measure on relaxed fabric, excluding edges and compressed fold lines. Taller pile improves shelf bulk but increases lint, seam bite and carton cube. | | Total thickness | Buyer-defined setting: 0.5kPa pressure, 20cm² foot, 30s dwell | ISO 5084 permits specified pressure and presser-foot area to be agreed; write them in the PO. Do not compare results from different pressures without correlation to sealed sample. | | Curl recovery after one wash | No broad flattened area larger than 50 x 50mm on inspected specimens | Wash per ISO 6330 or AATCC 135 as agreed; specify load, detergent, drying and inspection lighting. Compare to sealed approval sample. | | Loose fibre / lint | Buyer-defined internal vacuum or rub method; target set from pilot lot | Example pilot target may be below 20-40mg loose fibre per 0.25m² after one standard pre-cleaning pass, but only if apparatus and controls are locked. This is not an industry-standard lint limit. | | Crocking on dark shades | Dry grade 4 min; wet grade 3-4 min typical | ISO 105-X12 or AATCC 8. Deep navy, black, red, burgundy and dark green often need tighter dyehouse control. | | Dimensional change | Length and width within -3% to +2% after wash | ISO 6330 with ISO 5077 evaluation or AATCC 135. Add skew/twist limit if the throw has border print, binding alignment or plaid packaging photos. | | Back treatment | Soft-touch stabilisation; no whitening, flaking, powdering or delamination after wash | Define binder add-on target by supplier process control where used. Buyer should approve back hand standard and stiffness range. | | Shade | Grey scale grade 4 min to approved standard; DECMC or DE00 tolerance if spectro-controlled | Use roll head/middle/tail and edge/centre checks. Segregate shade lots before sewing and packing. | | Carton and bale pack | Compression recovery to at least 90-95% of initial packed height after storage simulation | Use ISTA 1A/2A/3A, ASTM D4169, or retailer protocol. Define stack height, humidity, duration, drops and deformation limits. | | AQL | Critical 0; major 2.5; minor 4.0 typical for retail throws | Use ANSI/ASQ Z1.4 or ISO 2859-1. Define berber-specific defect classes and run a separate packaging audit for cartons, barcodes and PDQ/display units. |
Failure 1: the 340gsm spec is met, but the throw looks thin
GSM alone is a weak buying control for high-loft berber polyester. A fabric can test at 340gsm after conditioning and still look flat if yarn bulk, loop length, raising depth, brushing, tumbling, shearing, heat setting and roll handling are not controlled together. We treat 340gsm as a finished-fabric target with a realistic tolerance, commonly ±5%, tested after relaxation in standard atmosphere. If the PO says only "340gsm sherpa" or "340gsm berber", the mill can meet mass while the face looks underbuilt.
Use ISO 3801 or ASTM D3776/D3776M according to the laboratory system named in the buyer manual. Both can be used for fabric mass per unit area, but do not mix them in one dispute without checking specimen size, conditioning and calculation. A workable bulk rule is: condition fabric for at least 24 hours at 20 ±2°C and 65 ±4% RH; cut at least five specimens per colour lot using a calibrated GSM cutter, commonly 100cm² or larger where the pile permits; avoid 10cm from edges, seams, roll-start crush marks and visible defects for routine acceptance; exclude binding, labels, hangtags, belly bands and inserts unless the PO is testing complete throw mass.
The controls that explain perceived bulk are apparent pile height, pile density, ground coverage and compression recovery. For a club-store throw in the 127 x 152cm to 152 x 177cm range, a berber face may sit around 6-10mm apparent pile height. Above about 10mm, shelf bulk improves but shedding, seam bite, needle heat and pack-volume pressure increase. Below about 6mm, stitching is easier and cube is lower, but many buyers read it as ordinary sherpa rather than high-loft berber.
Replace vague words such as "thin", "wiry" or "ordinary sherpa" with panel and instrument controls. For visual bulk, inspect three full-width panels per colour lot under D65 or TL84 at 800-1200 lux, viewed from 60-80cm and compared with the sealed approval sample. Fail if ground fabric is visible through the pile in normal viewing, if low-loft bands wider than 30mm run continuously for more than 300mm, or if the defect is visible in folded retail presentation. For buyer panel assessment, use at least three trained assessors, blind the supplier name, and record pass/fail against the sealed standard rather than personal preference.
For total thickness, ISO 5084 is useful only after the pressure, foot area and dwell are written into the specification. The common buyer control we use is: condition 24 hours; measure 10 positions per throw or fabric panel, excluding 10cm from edges and seams; use a circular presser foot of 20cm² at 0.5kPa for 30 seconds dwell; report average, minimum and maximum. ISO 5084 allows specified test pressure and presser-foot area to be agreed for different textile types; 0.5kPa and 20cm² should be treated as buyer-defined parameters, not assumed defaults across all labs.
Compression recovery is often more useful than static thickness. One practical method is to cut three 200 x 200mm panels, measure initial thickness, compress under 2.0kPa for 30 minutes, release for 30 minutes, then remeasure. A reasonable pilot target for bulky polyester berber may be 85-90% thickness recovery, but lock the number only after sampling. This test is internal unless tied to a recognised compression standard, so keep sealed pilot panels for correlation.
Uneven loft across the roll is a common dyeing and finishing issue. Centre areas can dry differently from edges; high stenter tension can open curl or pull the ground structure flatter. The effect varies by yarn, knit structure, moisture level and heat-setting route, so do not specify machine settings unless you own the process window. Specify the result: uniform face height, no roll-edge shadowing, and no visible low-loft bands in retail fold. For other fleece constructions, our guide to fleece weight throw blanket programs explains why GSM should not be used as the only comfort metric.
Failure 2: curl height drifts during raising, tumbling and heat setting
Berber curl is made in finishing, not in the sales description. Depending on construction, polyester yarn may be knitted, raised or brushed, tumbled, sheared and heat set so the curls stay rounded after cutting, sewing, packing and laundering. Too little setting or cleanup can leave the face fuzzy after wash. Too aggressive a setting can reduce loft, increase surface harshness, stiffen the reverse treatment or create shiny pressure marks. These effects vary with yarn denier, filament count, knit density, moisture regain, overfeed and oven dwell; the buyer should specify appearance and recovery, not a universal stenter temperature.
A precise PO line is: "Face curl to remain rounded and evenly distributed after one wash per ISO 6330, programme 4N or buyer-approved 30°C gentle cycle, 2.0 ±0.1kg ballast load, ECE or AATCC standard detergent as applicable, no optical brightener unless agreed, low tumble dry or line dry as care label; inspect after 4h conditioning. No broad flattened areas larger than 50 x 50mm on any inspected specimen; no yarn straightening worse than sealed approval sample." For US programmes, AATCC 135 is commonly used for dimensional change after home laundering.
Define the inspection setup for that 50 x 50mm curl-recovery criterion. Use at least three finished throws per colour from pilot or bulk, one taken from roll head, one middle and one tail where traceability allows. Inspect on a flat table under D65 light at 800-1200 lux, at 60-80cm viewing distance, with the pile brushed only by hand in the normal lay direction. Do not steam, shake aggressively or groom the face before inspection unless the consumer pack instructions require it. Pass if all sampled throws meet the criterion; if one fails, inspect the retained counter-sample and hold the shade lot for disposition.
For colourfastness on solid polyester shades, realistic bulk targets are often colour change grade 4 and staining grade 3-4 after the agreed wash test. Deep navy, black, red, wine and saturated green shades need crocking control: ISO 105-X12 or AATCC 8, with typical minimums of dry rubbing grade 4 and wet rubbing grade 3-4 unless the buyer standard is stricter. Where a buyer uses both methods, state which result governs acceptance because crock cloth, pressure and wet pick-up differ.
Roll compression before sewing can change curl height. Rolls stacked horizontally under high load can form longitudinal flat lanes; tight winding can press the face into the back coating; damp fabric held before full relaxation can show roll memory. Our normal controls are moderate roll diameter, no excessive roll stacking height, fabric relaxation before cutting and clean face-to-face handling. If a programme must move directly from finishing to cutting to hit a vessel date, the higher risk of size drift and loft variation should be accepted in writing or priced with extra inspection time.
Heat-transfer patches, appliqué, wide woven labels and embossing can crush high pile. Test decoration on production fabric with production back treatment. A transfer that works on 180-240gsm microfleece may sink into berber and leave a hard rectangle. For branding trade-offs, see custom blanket decoration methods.
Failure 3: lint is controlled in the sample room but not in bulk production
High-loft polyester sheds most during cutting, sewing, packing and the first handling cycles. Dark shades show loose fibre faster because fibre dust contrasts with polybags, cartons and club-store fixtures. A good salesman sample does not prove the bulk lot is clean; sample-room pieces are often brushed, vacuumed and folded by one operator, while production bales run through cutting stacks, overlock machines, thread trimming and compression.
There is no single universal lint standard for high-loft berber throws. If a buyer uses an internal lint number, label it as an internal correlation method and define the apparatus fully. A repeatable vacuum method can be written as follows: condition finished throw for at least 4h in inspection room; mark a 500 x 500mm face area away from seams and fold lines; use a vacuum unit fitted with a clean smooth nozzle 30 ±2mm wide, suction at nozzle verified at 12-15kPa or airflow verified by calibrated flow meter, new pre-weighed filter pad conditioned and weighed to 0.001g; pass the nozzle over the area in overlapping straight strokes for 30 seconds at approximately 100mm/s; recondition filter for 30 minutes before weighing; report mg loose fibre per 0.25m². Run a blank filter and a clean reference fabric at the start of each inspection day.
A typical acceptance band for well-finished polyester berber may be below 20-40mg per 0.25m² after one standard pre-cleaning pass, but this number must come from the approved pilot lot. It is not a published ISO or ASTM requirement. The practical limit should be: bulk shade-lot average not more than the sealed pilot average plus the agreed tolerance, no single tested throw above the agreed reject limit, and no visible fibre clumps inside retail packaging. Keep the pilot filter photos and weight records with the sealed sample; otherwise the number becomes impossible to enforce fairly.
A dark-cloth rub check is useful for line control, but it is also internal. Define it as: 100 x 100mm black desized cotton cloth, washed and lint-rolled before use; cloth mounted on a flat rubbing block with 1.0kg total load; 20 cycles over a 150mm stroke in the pile direction and 20 cycles cross-pile; test area 200 x 200mm; inspect cloth under D65 at 800-1200 lux. Pass criterion: no fibre clumps over 3mm, no continuous fibre smear, and visual grade not worse than sealed pilot cloth. Replace cloth every test and clean the block between shades. This method should correlate to the sealed approval sample, not to an invented industry grade.
For lab-style language, linting and fuzzing can be associated with Martindale abrasion appearance under ISO 12947-2 or mass loss under ISO 12947-3, and pilling/fuzzing appearance under ISO 12945-2. These are not perfect lint tests for berber because loose cut fibres and pile curl behave differently from flat apparel fabrics. They are still useful if the buyer wants a third-party lab record. We usually combine three controls: production vacuuming after sewing, visual lint inspection inside clear polybags, and the internal rub/vacuum method on packed samples from each shade lot.
Root cause matters. Over-raising creates weak loose fibre. Insufficient tumbling leaves cut and broken fibres in the face. Weak back stabilisation allows fibre migration through the ground. Dull blades and poor extraction create cutting dust. More binder may reduce lint but can flatten the pile and stiffen the reverse. Extra tumbling can improve cleanup but open curls and change finished size. Sharper blades, lower stack height and local extraction reduce cutting dust without changing the textile, but add process time. Treat lint as an engineered balance, not a cosmetic line at final inspection. For broader inspection practice, see blanket quality control inspection.
Failure 4: the back treatment stops shedding but kills the hand
Many 340gsm berber throws use a light reverse-side treatment to stabilise fibres, improve dimensional control and reduce linting during cutting. The failure is over-correction. Too much acrylic, PU-type or other binder can make the reverse feel papery, noisy, cold or boardy, especially on single-layer throws where the consumer touches both sides. Too little treatment gives seam dust, fibre migration into polybags and lint transfer to dark clothing.
Write the reverse specification in measurable and sample-based terms. Example: "Soft-touch stabilising back treatment; finished fabric 340gsm ±5% inclusive of binder; binder add-on controlled within supplier-approved production range, recorded per coating batch; no visible stress whitening after fold test; no flaking, powder transfer, tackiness, sour odour or solvent-like odour; reverse handle and bending stiffness not worse than sealed approval sample." If the binder is part of a restricted-substance or retailer chemistry review, confirm the chemistry before bulk rather than after inspection.
For stiffness, use ASTM D1388 cantilever bending or ISO 9073-7 if appropriate for the substrate and buyer lab. Because high pile and brushed backs can give noisy readings, correlate the target to sealed pilot bulk. A practical buying control is maximum bending length not more than 10-15% above approved pilot average in both machine and cross directions, with no individual result above an agreed reject limit. The exact number should be set from the pilot lot; do not copy a stiffness value from woven apparel fabric.
Compression/recovery and back softness should be checked together. A back treatment that improves lint by locking the ground too hard often reduces thickness recovery after bale compression. For club-store throws, test three packed samples after 7 days compressed in retail pack, then open and measure thickness recovery after 2h and 24h. If recovery after 24h is below 90% of the approved pilot, consumers may see permanent flat panels on first opening.
A simple production fold-crackle test is useful if it is defined. Fold the throw face-in and face-out over a 25mm mandrel, apply a 2kg weight for 10 seconds, release and inspect the reverse under D65 at 800-1200 lux. Reject if there are white stress lines longer than 20mm, coating flakes, powder transfer onto clean black cotton cloth, tack blocking, or audible crackle clearly louder than the sealed approval sample. Record pass/fail by coating batch.
Wash durability must include the reverse. After one and three home-laundry cycles, inspect for delamination, powdering, hard spots, lint increase and odour. For abrasion, a buyer may add Martindale appearance after an agreed cycle count or a simple reverse rub against black cloth. If the throw is sold with a brushed back rather than coated back, specify pilling and fuzzing with ISO 12945-2 or ASTM D3512 as agreed.
Odour and VOC language should be realistic. Most polyester berber throws do not require a VOC chamber test unless a retailer protocol demands it, but strong residual monomer, solvent-like odour or sour wet-finish smell is a commercial defect. Use a sealed-bag odour check: one finished throw sealed in an inert bag for 24h at room temperature, opened by three assessors, graded against the approved sample. If a retailer has a formal odour scale, use that instead.
Failure 5: seams bite into the pile or open after compression
High pile hides poor sewing until the product is compressed. After bale packing, seam ridges can print into the face; overlock edges can curl; binding can twist; corners can develop skipped stitches because the needle is passing through pile, ground, reverse treatment and label stack. A throw that looks acceptable on the sewing table can look uneven in a PDQ tray after three weeks in warehouse compression.
For a single-layer berber throw, common edge options are overlock, folded hem, self-fabric binding or separate knitted/woven binding. Overlock is cost-efficient but exposes more pile dust and can look promotional. Binding gives a cleaner retail edge but adds bulk, seam stiffness and shade-matching risk. If the programme uses contrast binding, specify colourfastness and shade tolerance for binding separately from body fabric.
Useful seam controls include stitch density, seam strength and seam appearance after compression. For overlock, 3-4 thread overlock at roughly 3-5 stitches/cm is common, adjusted to fabric thickness. For bound edges, lockstitch or chainstitch density often sits around 3-4 stitches/cm. Needle size and thread ticket depend on exact pile and binding; for bulky polyester throws, polyester thread is normally preferred for wash stability. Avoid specifying a stitch density without checking seam puckering and needle cutting.
Seam strength can be tested by ASTM D5034 grab method or ASTM D1683 seam strength if the seam geometry allows, but many throws fail commercially by seam distortion before tensile rupture. A practical target is no seam opening over 3mm, no skipped stitch run longer than 20mm, and no broken thread after three firm hand pulls along each side and after one wash. For premium retail, add a lab seam-strength target set from pilot bulk; for bulky fleece throws, buyers often accept a lower formal strength than apparel seams because the product is not load-bearing, but visible seam failure is still a major defect.
Inspect corners separately. Corners carry labels, folded binding and bar-tack-like thread build-up. Defects to classify as major include missed binding catch, exposed raw ground over 5mm, skipped stitch sequence over 20mm, hard corner lump visible through retail fold, and seam contamination with loose fibre clumps. Minor defects include short loose thread ends if they can be trimmed without weakening the seam.
Failure 6: shade banding appears only after cutting and folding
Berber shade problems are often half colour and half pile direction. The same dyed lot can look different when curl direction, brushing direction or roll tension changes. Ivory, oatmeal, camel, taupe, grey and heather shades show pile-shadow banding under warehouse lighting even when spectrophotometer readings are acceptable on a flattened specimen. Dark shades show lot breaks at binding and label panels.
Use objective shade assessment plus visual pile assessment. For colour, assess against the approved standard with ISO 105-A02 grey scale or buyer-approved grey scale, usually grade 4 minimum for main body to standard and grade 4-5 for components within the same throw if the buyer is strict. If using a spectrophotometer, state the geometry, illuminant/observer and tolerance, for example D65/10° with DECMC 2:1 or DE00. A common commercial tolerance for polyester solids may be around DECMC 1.0-1.5 to standard, but pile fabrics can visually fail inside that range, so visual approval still governs.
Sampling frequency should cover roll variation. At minimum, check roll head, middle and tail, and check left edge, centre and right edge on wide rolls. For high-risk shades, cut shade swatches every 300-500m or per dye lot/finishing batch, whichever is tighter. Keep roll tickets through cutting so panels from different shade bands are not mixed into one carton or PDQ.
Lot segregation rules must be written before sewing. Do not mix dye lots within one finished throw. Do not mix visibly different roll lots within one retail carton unless the buyer accepts assortment variation. For club-store pallets, keep one shade lot per pallet where possible; if mixed pallets are unavoidable, mark carton ranges and pallet maps. Shade claims are harder to defend if production cannot trace carton to roll.
Pile direction should be consistent in cutting. A body panel cut against nap beside a binding or folded presentation cut with nap can look like a shade mismatch. Mark nap direction on the cutting plan, train operators not to rotate panels for yield unless allowed, and inspect folded retail presentation rather than only flat open throws.
Failure 7: club-store bale packs flatten the throw and damage cartons
Warehouse-club pack-out is a textile and logistics problem. Buyers want a large, soft throw with high shelf impact, but they also want low cube, stable pallets, readable barcodes and cartons that survive domestic distribution. A 340gsm high-loft berber throw may recover well from light folding but poorly from tight vacuum compression or long static load in a humid warehouse.
Define pack compression by measurement, not adjectives. Record initial folded pack height after normal packing, compressed pack height after bale or carton closure, and recovery after opening at 2h and 24h. A practical target is recovery to at least 90-95% of approved pilot packed or opened height after a defined storage simulation. If the pack uses ribbon, belly band or PDQ tray pressure, inspect for permanent strap marks wider than 10mm or flat panels larger than 50 x 50mm after 24h recovery.
For carton compression, choose a recognised route. ISTA 1A is a basic packaged-product test for lighter parcels; ISTA 2A adds atmospheric conditioning and compression; ISTA 3A is more demanding for parcel distribution; ASTM D4169 can be used when the buyer specifies distribution cycle and assurance level. Club-store buyers may also have retailer-specific protocols that override these. Confirm which one governs before carton artwork is printed.
A useful compression specification states: carton style and board grade; gross weight; pallet pattern; maximum stack height; warehouse humidity conditioning; compression force or top-load duration; and acceptable deformation. Example: condition packed cartons 24h at 23°C/50% RH and, for humid-route risk, 24h at 38°C/85% RH; apply calculated top load based on pallet stack height and safety factor for 1h or retailer-specified duration; accept if carton height loss is under 10%, no panel buckling exposes product, no tape failure, no crushed corner that affects pallet stability, and barcode remains scannable. The compression force should be calculated from actual carton gross weight and stack count, not copied from another SKU.
Drop testing should match carton weight and channel. For ISTA-style handling, include face, edge and corner drops at the height required by the chosen protocol. After drops, product should have no permanent contamination, no torn retail wrap, no broken belly band or handle, no carton rupture exposing product, and no PDQ/display damage that prevents store set-up. If PDQ trays are used, test both master carton and opened display tray.
Pallet cube has direct commercial impact. High-loft berber packs can lose one pallet layer compared with lower-pile fleece if compression is restricted. Before quoting FOB, CIF or DDP, calculate units per inner, units per master, cartons per layer, layers per pallet, pallet height, container load and expected cube after any compression. A few millimetres added to folded height can change pallet count and landed cost. For lead-time and shipping planning, see custom blanket lead times and shipping.
Barcode, PDQ and club-display requirements belong in the technical pack. Confirm UPC/EAN size, quiet zone, print contrast, scannability after shrink or polybag glare, carton SSCC labels if required, pallet labels on two adjacent sides, display orientation, tear-away perforation strength, and whether the product must be visible through a window or open tray. Packaging defects should be audited separately from product AQL because a perfect throw in a failed club pack is still a failed shipment.
Pre-shipment AQL: berber-specific defect classification
Use ANSI/ASQ Z1.4 or ISO 2859-1 and write the inspection level into the PO. For finished retail throws, General Inspection Level II is a common starting point, with critical defects at 0, major AQL 2.5 and minor AQL 4.0. Tighten for first orders, high-value club programmes, baby/kids claims or retailer history. Use Special Inspection Levels only for defined lab checks or destructive tests, not for general workmanship unless the buyer accepts the reduced sample size.
Critical defects for berber throws include needle or metal contamination, mould or wet product, wrong fibre content label where legally required, flammability non-compliance where applicable, banned/restricted chemical failure confirmed by test, live insect contamination, and barcode assigned to the wrong SKU if it creates retail/legal exposure. Critical defects are normally not accepted under AQL.
Major defects include GSM outside tolerance, wrong size beyond agreed dimensional tolerance, visible shade mismatch within one throw or carton, low-loft band visible in retail fold, broad flattened area over 50 x 50mm after agreed recovery, lint clumps inside packaging, back coating flaking or whitening, seam opening over 3mm, missed binding catch, skipped stitch run over 20mm, dirty mark not removable by light brushing, wrong care label, wrong colour ratio in assortment, and packaging failure that prevents sale.
Minor defects include short untrimmed thread ends, slight pile direction variation not visible in retail presentation, small isolated lint specks removable by normal handling, minor polybag wrinkle, small carton print scuff not affecting barcode or display, and slight belly-band skew within the buyer-agreed tolerance. Do not let repeated minor defects become a hidden process issue; if the same minor defect appears across many samples, treat it as a corrective action even if AQL passes.
Product AQL and packaging audit should be separate. Product AQL covers the throw. Packaging audit covers master carton strength, carton markings, barcode scan, polybag warning, suffocation warning where required, PDQ set-up, pallet pattern, pallet label, carton count and shipping marks. If the buyer rolls carton failures into product AQL without a packaging checklist, disputes become subjective.
A practical pre-shipment checklist for 340gsm berber throws: verify PO, colour, size and pack ratio; condition sample pieces before GSM and thickness checks; measure finished size before and after one wash on retained samples if required; inspect pile height and curl recovery; run lint rub or vacuum method on each shade lot; check reverse treatment for whitening, odour and powdering; inspect seams and corners; scan all retail and carton barcodes; open at least one carton from top, middle and bottom pallet layers; photograph pallet build and carton condition before loading.
Spec language FIELDLOOM would put in a buyer tech pack
Use concise, enforceable language. Example: "Finished fabric: 100% polyester high-loft berber, 340gsm ±5% tested to ISO 3801 after 24h conditioning at 20 ±2°C and 65 ±4% RH; five 100cm² specimens per colour lot, excluding binding and trims. Apparent pile height 6-10mm; total thickness tested to ISO 5084 with buyer-defined 20cm² presser foot, 0.5kPa pressure and 30s dwell; average and minimum to match sealed approval sample within agreed tolerance."
For pile recovery: "After one wash to ISO 6330 30°C gentle cycle with agreed detergent, 2kg ballast load and care-label drying, inspect under D65 800-1200 lux at 60-80cm. No broad flattened area greater than 50 x 50mm; no continuous low-loft band wider than 30mm and longer than 300mm visible in retail fold; curl appearance not worse than sealed approval sample."
For lint: "Bulk production must pass buyer internal lint correlation method. Vacuum test: 0.25m² face area, calibrated suction/airflow, 30s standard pass, pre-weighed filter to 0.001g, blank control each inspection day. Acceptance limit set from approved pilot lot; visible fibre clumps in retail pack are major defects. Dark-cloth rub method may be used for line control only and must be judged against sealed pilot cloth."
For reverse treatment: "Soft-touch stabilised reverse; no tack, powdering, flaking, stress whitening, sour odour or solvent-like odour. Bending stiffness by ASTM D1388 or ISO 9073-7, if required, not more than agreed pilot tolerance. Reverse to show no delamination or powder transfer after one and three home-laundry cycles."
For club pack: "Packed throw to recover to at least 90-95% of approved pilot height after defined compression storage; no strap or fold mark causing flat area over 50 x 50mm after 24h open recovery. Master carton and PDQ/display pack to pass buyer-agreed ISTA, ASTM D4169 or retailer protocol. Barcode must scan through final retail packaging and after distribution test."
Frequently asked
Is ISO 3801 or ASTM D3776 better for a 340gsm berber throw? Either can be used if the buyer names the method and specimen plan. ISO 3801 is commonly used for textile fabric mass per unit area; ASTM D3776/D3776M is common in ASTM-based buyer manuals. For bulky berber, the key is conditioning, specimen size, number of specimens and whether binding/trims are excluded. Do not compare mixed-method results without correlation.
Can we use a 20-40mg lint limit for all high-loft berber throws? No. That range can be a useful internal target for some well-finished polyester berber fabrics, but it is not a recognised universal standard. Set the lint limit from approved pilot production using a fully defined vacuum method, calibrated suction or airflow, pre-weighed filters and sealed reference samples.
What is a realistic pile height for a 340gsm high-loft berber throw? Many retail berber faces sit around 6-10mm apparent pile height, depending on yarn, knit structure and finishing. Taller pile gives stronger shelf bulk but raises lint, sewing and carton-cube risk. Shorter pile packs better but may look like ordinary sherpa instead of high-loft berber.
How should we judge a harsh or stiff back coating? Use a sealed hand standard plus measurable controls: binder add-on recorded by the mill, bending stiffness by ASTM D1388 or ISO 9073-7 if suitable, fold-whitening inspection, powder-transfer check on black cloth, odour check and wash durability. Avoid relying only on the word "soft" in the PO.
Should carton defects be counted in product AQL? Keep product AQL and packaging audit separate. Product AQL covers fabric, size, seams, lint, shade and labels on the throw. Packaging audit covers carton strength, PDQ function, barcode scan, polybag warning, pallet build and shipping marks. A saleable throw can still fail shipment if the club-store display pack fails.
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