Presses à balles rondes et presses à balles carrées : le guide technique complet pour les agriculteurs et les entrepreneurs agricoles du Royaume-Uni

Round Baler Operating Principle

A round baler picks up a windrow of crop using a tined pickup reel rotating at approximately 70–110 rpm. The crop is fed between a series of rubber-coated or steel belts — or, in fixed-chamber designs, between steel rollers — that form the bale chamber. As the crop accumulates, the rollers or belts apply progressive compaction force, rotating the growing bale continuously. In variable-chamber designs, the chamber expands from approximately 0.8 m to 1.8 m in diameter as crop density builds. When a sensor detects the target density, an audible or electronic alarm prompts the operator to engage the wrapping cycle, during which twine or net wrap is automatically dispensed through a pre-programmed revolution counter. Net wrap reduces bale surface area exposure and is preferred for high-moisture silage crops typical of the UK climate in Devon and Wales, where late-season rainfall is common.

Square Baler Operating Principle

Square balers — more accurately described as rectangular balers — use a reciprocating plunger mechanism. Crop gathered by the pickup is swept by a rotating feeder auger into the pre-compression chamber, then forced by the plunger into the main bale channel. On every stroke, the plunger compresses a fixed “flake” of material. Accumulated flakes form a bale of programmable length, which is then tied with two or three strands of sisal or synthetic twine using a knotting mechanism first commercialised in the late 19th century but now CNC-machined to tolerances of ±0.05 mm. Large square balers (commonly 80×90 cm or 120×130 cm cross-section) can exceed 2.5 tonnes per bale, making them the preferred format for commercial straw trading between farms across the East Midlands and East Anglia.

Double-Chamber Technology

Double-chamber balers represent a significant engineering advance for mixed-crop contractors. The machine processes two bale chambers sequentially: while bale number one is being wrapped or tied in the rear chamber, the front chamber has already started accumulating the next bale. This eliminates the dead-time waiting period that can account for up to 18% of total field hours on a conventional single-chamber machine. For contractors operating across multiple sites in Shropshire or Herefordshire — counties where field sizes average below 10 hectares — the throughput advantage of dual-chamber design translates directly into the ability to cover more acreage before weather changes, reducing weather-risk exposure considerably.

Matériau du cadre

S355JR high-tensile structural steel, robotic MIG welded, hot-dip galvanised or two-pack epoxy coated to BS EN ISO 1461 standard for UK outdoor storage conditions and salt-laden coastal environments from Cornwall to Caithness.

Bale-Forming Belts

Aramid-reinforced SBR compound with Shore A 70–80 hardness; belt width 650–1000 mm; tensile strength >250 N/mm per 50 mm width; operating temperature range -15°C to +80°C; UV-stabilised outer surface for field storage durability.

Pickup Tines

65Mn spring steel, oil-quenched and tempered to 42–48 HRC; tine pitch 55–70 mm; tine replacement individually without partial disassembly; cam-controlled tine path for minimal crop loss in short or laid crops typical of UK ryegrass fields.

Knotter Components

Tool steel (equivalent to DIN 1.2379 / D2), CNC-machined to ±0.05 mm tolerance; surface-hardened to 58–62 HRC via induction process; knotter mechanism designed for minimum 500,000 knot cycles before overhaul, supporting high-volume contractors.

High-Density Bale Formation

Variable-density hydraulic systems allow operators to target bale densities between 130 and 200 kg/m³ for hay, or up to 750 kg/m³ for silage. Higher density reduces the number of bales per field (lowering transport and handling costs), improves fermentation conditions inside silage bales, and reduces the moisture ingress area per unit of crop mass. British contractors servicing dairy operations in Cheshire and Somerset particularly value density consistency, as it directly affects dry matter intake and ration formulation accuracy.

Precision Wrapping System

Net wrap application speed, overlap percentage, and the number of wraps are electronically programmable, typically via an ISOBUS-compatible terminal. Net wrap compared to twine reduces bale surface exposure by up to 35%, slowing moisture penetration during post-baling field storage. For farms in wet upland areas — the Lake District, Brecon Beacons, and the Pennines — this is not a luxury feature but an operational necessity. Twine consumption monitoring with auto-alert also prevents the costly scenario of bales exiting the machine unwrapped when a twine spool runs empty mid-field.

Smart PTO Load Management

Modern round balers incorporate overrunning clutches and shear-bolt protection on the driveline that protect both machine and tractor from sudden blockages when the pickup ingests a stone or a clumped windrow. Electronic PTO load sensors can feed real-time torque data back to the tractor ISOBUS system, allowing automated forward speed reduction to prevent overloading. This is particularly valuable for contractors running tractors in the 100–150 hp class across the varied terrain of the Welsh Marches or Yorkshire Dales, where ground undulation creates unpredictable crop density variations in a single swath.

Rapid Service Access Design

Hinged side panels, tool-free access to the knotter system, and pre-greased sealed bearings at all pivot points reduce routine daily service time to under 15 minutes. In the context of UK harvest windows, which frequently offer only 3–5 consecutive dry hours before the next rain shower, this is an engineering specification that directly affects the total crop secured per season. The availability of modular belt or roller assemblies — replaceable as a unit rather than component by component — further reduces unplanned downtime during peak periods such as the August cereal straw season.

Road Transport Compliance

UK road law requires agricultural implements to meet lighting, reflector, and width regulations under the Road Vehicles Lighting Regulations 1989 and Construction and Use Regulations. Well-specified balers ship with CE marking, integrated rear marker boards, and transport lighting looms compliant with UK Department for Transport guidelines. Maximum transport width is typically 2.55 m or 2.7 m depending on model, with hydraulic drawbar offsetting available on wider models to assist visibility when towing on narrow Devon lanes or Cotswold byroads.

Low Leaf Loss Crop Handling

In legume and clover crops — increasingly important under agri-environment schemes such as England’s Sustainable Farming Incentive — leaf shattering during pickup represents a significant nutrient loss. Cam-controlled tine path geometry, adjustable reel height, and reduced-aggression windguard settings on modern round balers can reduce leaf loss to below 5% in dry conditions. For organic and biodynamic farms across Hampshire and Kent, where crop nutritional value commands premium prices in specialist markets, this technical detail is commercially significant.

🌿 Silage & Grass Conservation — Yorkshire Dales & Cumbria

High-moisture grass silage production in the upland farms of the Yorkshire Dales and Cumbria demands round balers capable of achieving consistent bale densities above 600 kg/m³ fresh weight. The combination of variable-chamber hydraulic systems and net wrap dispensers is the standard here, with most contractors making three to four cuts per season between April and September. Bale weights of 600–800 kg are common, and operators require robust hitch geometry to handle wet field conditions where axle loads frequently exceed 3 tonnes during extraction. Ever Power’s large round baler series is tested specifically against these operating conditions, with sealed bearing systems proven in environments where daily water ingress would be fatal to standard open-race bearings.

🌿 Cereal Straw Baling — Lincolnshire & East Anglia Arable Farms

The arable heartland running from Lincolnshire through Cambridgeshire and into Norfolk generates enormous volumes of wheat, barley, and oilseed rape straw annually. Large square balers operating in this environment need to achieve throughputs of 35–45 bales per hour to keep pace with combine harvesting speed. Bale consistency matters commercially here — straw merchants and biomass energy plants in Birmingham, Coventry, and the wider West Midlands region apply strict standards for bale weight tolerance (typically ±25 kg at 500 kg nominal weight). Square baler knotters must perform reliably over full 12-hour shifts without adjustment, which demands the precision-machined bill hook assemblies and self-cleaning twine disc systems that mark professional-grade machines.

🌿 Hay Production for Equine Market — Surrey, Hertfordshire & Home Counties

The equine sector in the Home Counties and southern England is one of the UK’s most demanding hay markets. Horse owners and livery yard operators specify small, uniform bales — typically 20–25 kg small square bales or round bales no heavier than 300 kg — that can be handled without mechanical assistance. Bale shape consistency is critical: an irregularly shaped bale cannot be stacked safely in a conventional barn without mechanical handling, and for the equine market, barn storage is the norm. Balers operating in this context must produce bales with flat, consistent ends and tight twine tension, and are typically operated at lower forward speeds (6–8 km/h) to allow the plunger to complete full compression strokes on every flake.

🌿 Industrial Hemp & Biomass Baling — Scotland & Northern England

Industrial hemp cultivation is growing steadily across Scotland and northern England, supported by government interest in carbon-sequestering arable crops. Hemp stalks present a unique baling challenge: long fibre length (often exceeding 2 m at harvest), high moisture variability along the stem, and dense core material that resists compaction using standard roller geometry. Large round balers with custom rotor chopper attachments — reducing fibre length to 50–80 mm before bale chamber entry — achieve workable densities of 150–200 kg/m³ in hemp straw. Biomass energy facilities in the Sheffield area and beyond are increasingly sourcing compressed hemp bales as co-firing material with a gross calorific value of approximately 17 MJ/kg (dry basis).

🌿 Reed Bed & Conservation Area Cutting — Norfolk Broads & Somerset Levels

Nature reserves and Sites of Special Scientific Interest (SSSIs) across the Norfolk Broads, Somerset Levels, and the Fens require periodic cutting and removal of reed, rush, and sedge to maintain habitat quality. Baling this material — which lies flat, tangles easily, and clogs standard pickup tines — demands specially configured round balers with open-cage pickup guards, slow-rotation reel settings, and wide tine spacing. Bales produced must be light enough for manual handling on sensitive terrain where vehicle access is restricted. Contract operators servicing the RSPB, Natural England, and private conservation estates specify machines they can adjust quickly between crop types, making versatility a primary procurement criterion in this niche but growing application.

🌿 Waste Paper & Cardboard Recycling — Industrial & Commercial Facilities

Beyond agriculture, high-pressure horizontal balers are deployed in material recovery facilities, supermarket distribution centres, and paper mills to compact cardboard, newspaper, and mixed paper for recycling logistics. In Birmingham’s manufacturing and distribution corridor — one of the UK’s most densely concentrated logistics hubs — baling compressed waste paper at 300–600 kg/m³ reduces collection frequency and vehicle movements. These machines share core engineering with agricultural square balers but use hydraulic ram systems rather than PTO drives, and specify hardened bale channel walls to resist abrasive material. Output bale weights of 300–800 kg are compatible with standard telehandler handling, and bale dimensions are designed to maximise pallet-based container loading for export shipment.

Presse à balles rondes 9YK-870

The 9YK-870 is a compact yet capable round baler designed for farms running tractors in the 60–100 hp range. With a 0.87 m fixed-diameter bale chamber, adjustable pickup width, and straightforward twine-tying system, it is an ideal entry point for mixed livestock farms and smaller arable contractors needing reliable, low-maintenance performance across hay, straw, and light silage crops. The drive system is purpose-built for continuous 540 rpm PTO operation, and the open-access side panel design keeps service time under 10 minutes per day.

View 9YK-870 Details

Presse à balles rondes 9YQ-2300

Built for high-volume contractors and large farm operations, the 9YQ-2300 round baler handles everything from dense silage grass to lightweight straw with equal consistency. Its variable-chamber design scales from 1.2 m to 1.85 m bale diameter, and the electronically monitored net wrap system operates at speeds up to 3 m/s dispenser belt speed. A wide 2.3 m pickup width ensures maximum crop recovery per pass, reducing the number of headland turns in large fields across East Anglia and the East Midlands. Dual hydraulic circuits provide independent control of pickup height and chamber pressure, allowing real-time adaptation to changing crop conditions without stopping.

View 9YQ-2300 Details

Manufacturing Excellence

Ever Power: Factory Capability & Customisation Services

Ever Power operates a dedicated agricultural machinery manufacturing facility with over 15,000 m² of covered production space. Our engineering team works directly with customers to develop customised baler specifications that cannot be sourced from catalogue stock — including non-standard bale dimensions for specialist packaging requirements, modified pickup configurations for unusual crop types, and bespoke hydraulic control systems for integration with precision farming telematics platforms already in use on farm.

The manufacturing process begins with laser-cut S355 and S460 structural steel from certified mill-origin stock, moving through robotic welding cells where weld parameter logs are retained for each component batch. All major weldments undergo ultrasonic inspection before machining, and our CNC cell produces knotter components, sprocket hubs, and roller shafts to ISO 2768-m tolerances as standard. Surface protection follows a 5-stage phosphate-primer-topcoat process with minimum 80 µm dry film thickness, tested to 1,000 hours salt spray resistance under ISO 9227 — exceeding the typical storage conditions found in UK farm yards and contractor depots. Our supply chain includes tier-1 bearing suppliers (SKF, FAG certified grades), hydraulic components from Bosch Rexroth and Parker Hannifin equivalents, and rubber compounds sourced from accredited compounders.

Export logistics for UK buyers are handled through established freight forwarding partners with departure from Tianjin and Shanghai, with typical transit times to UK ports of 28–35 days. Full documentation packages including CE declarations of conformity, operator manuals in English, and UK-format parts catalogues are included as standard. Ever Power offers 12-month warranty coverage with expedited parts dispatch for registered UK customers.

📧 Request Custom Baler Quote — [email protected]

“We ran two Ever Power square balers back-to-back through 280,000 bales last summer without a single knotter stoppage. The custom tension setting they configured for our equine straw contracts was spot-on from the first day. I was sceptical about a direct-from-manufacturer purchase, but the technical support before and after delivery was better than anything I have had from established dealers.”

— James Hawthorne, Hawthorne Agricultural Services, Spalding, Lincolnshire

“We specified the 9YQ-2300 for our third-cut silage in the Yorkshire Dales last season. The variable chamber and sealed bearing arrangement were exactly what we needed — we run through wet conditions daily and the previous machine was constantly dropping bearings by October. The Ever Power unit went through the whole season without a bearing change, which was genuinely unexpected. Build quality is noticeably heavier than similar-priced alternatives.”

— Margaret Cliffe, Cliffe Hill Farm Contracting, Leyburn, North Yorkshire

“The Ever Power team configured a double-chamber model for our biomass hemp operation in Northumberland. Nobody else was willing to customise the rotor pre-cutter for that crop type without a huge minimum order — Ever Power built to our spec for two units and delivered exactly what the technical drawings specified. The throughput at our site is around 40 bales per hour in dry hemp, which is significantly better than we had estimated. Parts pricing is also very competitive for a specialist machine.”

— Richard Forsyth, Tyne Valley Biomass Ltd, Hexham, Northumberland