The first hard cut on any wrapping-machine inquiry is the package envelope: length × width × height, plus the largest diagonal the film has to clear [S1]. A stretch wrapper sized for a 1200 × 1200 mm pallet will physically refuse a 1300 mm load, and a flow-wrapper calibrated for 80 mm product length will not seal a 250 mm baguette without a changeover that costs 30-60 minutes of line time.
For a working spec, set four numbers up front: package L×W×H, throughput target in packs per minute, film specification (PE stretch gauge 17-23 µm, BOPP 20-30 µm, flow-wrap PE/PP laminate 25-60 µm) and the load weight if pallet is involved [S2]. Vendors like the Shandong Dyehome range listed on Made-in-China and China.cn show turntable diameters from 1500 mm up to 3000 mm and wrapping heights to 2400 mm, which is the practical envelope for most pallet end-users [S2].
Wrapping Machine Type Matrix: Stretch vs Flow vs BOPP Overwrap
Stretch wrappers, flow-wrappers (horizontal form-fill-seal) and BOPP overwrappers solve different problems and should not be cross-quoted [S1]. A rotary-ring stretch wrapper typically delivers 30-70 pallets/hour at 12-20 rpm turntable speed; a flow-wrapper runs 30-200 packs/min depending on cut-off length; a BOPP overwrapper runs 30-120 bundles/min and uses heat-seal cutting on a flat film web [S2].
Selection logic: choose stretch when the load is a pallet of variable-height boxes and the film must conform under pre-stretch (200-300% on power-pre-stretch carriages). Choose flow-wrap when the product is a single rigid or semi-rigid item fed on a conveyor. Choose BOPP overwrap for cartons, tissue packs and bundles where a clear, tight printed film matters more than pallet containment [S1]. Reference the wrapping machine baseline page for the architectural differences before you spec.
Spec Bands That Drive Vendor Selection
For a stretch wrapper the binding spec is turntable diameter (1500 / 1650 / 1800 / 2000 / 2200 / 2500 / 3000 mm) and maximum wrapping height (1800-2400 mm typical, 2800 mm on heavy-duty builds) [S2].
For a flow-wrapper, the binding numbers are cut-off length (max 250-650 mm on standard models, 900 mm on bakery/loaf builds) and web width (max 350-650 mm) [S1]. A third binding spec is sealing jaw geometry: rotary jaw for high speed above 80 packs/min, box-motion jaw for 30-60 packs/min on heavier PE laminate. For a BOPP overwrapper like the Rasch Spezialmaschinen hollow-article build, the binding numbers are seal-folding width (40-80 mm typical), article diameter range and labeller interface for asymmetric pieces [S3]. The shrink wrapping machine baseline page covers the heat-tunnel half of a flow-wrap + shrink line.
Throughput Math: Packs/min vs Pallets/hour vs Bundles/min
Capacity claims on a quotation are rated outputs, not sustainable outputs; derate 15-25% for changeover, film threading and operator breaks. A stretch wrapper rated at 50 pallets/hour typically delivers 38-42 sustained over an 8-hour shift; a flow-wrapper rated at 120 packs/min typically sustains 95-105 including reject recovery [S2].
Verify three figures on any quote: rated throughput at the product size you will actually run (not at the test pack), changeover time in minutes between two SKUs, and film scrap percentage (target under 1.5% for stretch, under 2.5% for flow-wrap including trim).
Decision Criteria Comparison: Stretch vs Flow vs BOPP vs Shrink
Four decision criteria separate the four architectures cleanly. (1) Cost per wrapped unit: stretch is lowest at roughly 0.04-0.08 EUR per pallet in film; flow-wrap 0.6-1.2 EUR per pack; BOPP overwrap 0.8-1.5 EUR per bundle; shrink 1.0-2.0 EUR per pack including tunnel energy. (2) Speed band: stretch 30-70 pallets/h, flow 30-200 packs/min, BOPP 30-120 bundles/min, shrink 20-90 packs/min. (3) Film logic: stretch uses mechanical tension and cling, not heat; flow and BOPP use heat-seal jaws; shrink uses a heated tunnel downstream. (4) Geometry: stretch takes any palletizable cube; flow takes rigid items under the cut-off length; BOPP takes rectangular cartons and bundles; shrink needs a tunnel matched to pack L×W×H [S1][S2].
Cross-reference the linear guide baseline when you need the carriage-rail life for a high-cycle BOPP overwrapper running three shifts, since the seal jaw and film-feed carriages are the wear item. For a stretch wrapper running 16 hours/day, focus on turntable bearing life (target L10 50,000 hours) and pre-stretch roller surface treatment (carborundum grit or rubber, depending on film gauge) [S2].
Integration and Line-Fit Levers
Three integration points decide whether a wrapper survives a real plant. First, infeed conveyor height and direction: most turntable stretchers accept conveyors 350-450 mm above floor and load from the front; conveyor misalignment over 5 mm causes film tail breakage on the load corner [S2]. Second, film roll handling: stretch wrappers use 500 mm ID cores at 250-300 mm OD; flow-wrappers use 76 mm cores at 400-500 mm OD; mismatch on core size is the single most common line-fit failure. Third, electrical and control: 400 V / 3 ph / 50 Hz is the European default, 480 V / 3 ph / 60 Hz is North American; PLC platforms (Siemens S7-1500, Allen-Bradley CompactLogix) and fieldbus (PROFINET, EtherNet/IP) must be agreed before PO, not after [S1].
On hollow-article wrapping, the film-handling and labelling integration is tighter still: a Rasch-style wrapping line stacks a feeding conveyor, a front-folding station, a heat-seal station, a seal-folding station, an optional labeller and a discharge belt into 4-6 m of line length with servo synchronisation across each axis [S3]. Cycle-time drops to 1.5 seconds per article only when the upstream feeder holds constant pitch; a 50 ms variation on article pitch will fault the seal jaw within two hours. For plants specifying explosion-proof wrappers in zone 1 areas, ATEX Cat 2 rated electricals and a non-sparking turntable motor are mandatory and add 8-15% to the price band [S1].
Failure Modes and Sourcing Watch-Points
The three failure modes that wreck a wrapping line are not the ones the brochure shows. (1) Film tail breakage at the load corner — caused by pre-stretch ratio set too high for the film gauge (cap mechanical pre-stretch at 200% for 17 µm PE, 250% for 20-23 µm). (2) Seal-jam on BOPP — caused by jaw temperature drift outside 160-200 °C on 25 µm BOPP, or by 5 mm misalignment between the upper and lower jaw faces. (3) Turntable bearing failure on stretch — caused by overload at the turntable centre and by water ingress on washdown builds; specify IP65 turntable motors and sealed slewing-ring bearings for food and chemical plants [S2].
Sourcing watch-points: confirm CE / UKCA / UL marks on the control panel, request FAT video at the rated throughput on the actual film gauge, and pin a 5% acceptance reserve on the PO covering film-tail scrap and seal rejection over the first 200 hours. The coding machine and core machine baseline pages cover the upstream and downstream equipment you will integrate against, and a broader spec-band treatment is in How to Choose a Wrapping Machine: Spec Bands, Geometry Match and Sourcing Levers.
Two signals worth tracking: EU machinery regulation 2023/1230 enforcement at the operator level is pushing more stretch-wrappers into integrated safety-PLC builds (Cat 3 / PL d) for palletising cells, and the Chinese mid-tier stretch-wrapper brands are pushing turntable diameters up to 3000 mm with 250-300% power pre-stretch as a stock item rather than a custom option [S2]. Compare three quotes on the same L×W×H envelope, the same film and the same rated throughput before you sign, and lock pre-stretch ratio, film gauge and seal-jaw temperature as contractual acceptance lines.