Automatic Packaging Line Turnkey Bagging & Packing Systems

The right filling mechanism is determined by your product, not your preference. Granules and free-flowing pellets run on multi-head weighers; fine powders require impeller or screw auger mechanisms; reactive or hygroscopic materials need sealed-chamber designs. Specifying the wrong fill type is the most common mistake in line procurement.

Every automatic packaging line we supply includes an inline checkweigher positioned immediately after the sealer. Checkweighers catch both short-weight bags (compliance risk) and over-filled bags (direct margin loss). On a 25 kg product running 1,000 bags per hour, a 50 g average overfill costs roughly 2 kg of product per hour — that adds up to over 35 tonnes per year on a single-shift operation.

Conveyors on a packaging line are not a commodity item. Belt width, incline angle, speed synchronisation with the filler and sealer, and accumulation sections between stations all have to be calculated per line. We engineer conveyor sections as part of the line layout, not as an afterthought. Flat belt, roller and cleated incline configurations are available.

Seal type determines shelf life and handling durability. Heat sealing works for PE and laminate bags; sewing (with or without crepe tape) is standard for multi-wall paper and heavy woven bags; valve-bag top-folding is used on cement and plaster applications. The sealer must be matched to bag material — buying a heat sealer for a paper bag line will not work.

Palletising is where the labour saving is most visible — a manual team palletising 25 kg bags produces fatigue-related errors from the second hour of a shift onwards. Automatic palletisers produce consistent layer patterns, correct pallet heights and uniform wrap-ready stacks at the end of every shift, not just the first. Rotary arm and robot configurations are available.

Our most-requested product and the solution we recommend for any producer moving from semi-automatic or manual packing to a fully automatic packaging system. A turnkey line from QingXin includes pre-sale layout design, all mechanical and electrical engineering, factory acceptance testing at our facility before shipment, on-site commissioning and operator training. You receive one set of documentation, one PLC programme and one support contact — not a pile of manuals from six different suppliers.

The standard configuration runs: automatic bag presenter → filler → checkweigher → inline sealer → inkjet coder → flat-belt conveyor → rotary palletiser, all controlled by a Siemens S7 or Allen-Bradley PLC with HMI touchscreen. Modifications at engineering drawing stage add minimal cost; modifications after panel build are expensive. We are direct about this during the enquiry process.

Bulk product is conveyed from silo or hopper into the surge bin above the filler. Level sensors maintain a consistent feed head pressure, which directly affects fill accuracy. Variable-speed feeders prevent bridging in fine powders.

Consistent feed pressure = consistent fill weight

The filling unit meters the exact target weight into each bag — multi-head weigher for granules, auger or impeller for powders. The bag presenter positions and clamps each bag automatically. Cycle time is matched to line speed via PLC.

Fill cycle runs independently of bag changeover

The filled bag moves immediately to the sealer, then passes through the inline checkweigher. Bags outside the tolerance window (±10 g on a 25 kg bag is a typical spec) are rejected to a side conveyor before the palletiser. No under-weight bag reaches the pallet.

Reject rate data logged to HMI and exportable

The palletiser stacks bags in the programmed pattern onto a pallet. The PLC counts layers and signals when a full pallet is ready for removal. Pallet wrapper integration is available for producers shipping long distances or in humid environments.

Pattern library stored in HMI — no manual reconfiguration

Free-flowing granules are the most straightforward automatic bagging application. The focus for grain and seed operations is weighing accuracy, gentle product handling to avoid breakage, and bag material compatibility — woven PP is standard, but some seed products require breathable fabric bags. Multi-head weigher lines at 800–2,000 bags/hour are typical.

Chemical powder lines require dust-tight enclosures, sealed bearing housings and — depending on the product’s hazard classification — ATEX/IECEx explosion-proof electrical components. Stainless steel material contact surfaces are standard for corrosive powders. We size the dust extraction system as part of the line design, not as an add-on.

Cement is abrasive. Standard packaging line components wear out within months in cement applications — impeller blades, spout liners and conveyor belts all need specification for high-abrasion duty. Rotary packers with hardened wear liners and 6–12 filling spouts are standard for cement plants above 1,000 bags/hour.

Animal feed lines handle a mix of granule sizes, pellets and powder fractions — sometimes in the same run. The filling system needs to handle product density variation without recalibration between batches. Food-grade material contact surfaces are required for pet food applications. Output requirements are typically 600–1,500 bags/hour on 20–40 kg bags.

Food lines require 304 or 316 stainless steel product contact surfaces, washdown-rated electrical components and, for regulated markets, checkweigher integration with HACCP data logging. Lines for flour, sugar, rice and salt each have product-specific requirements — the filling mechanism for rice (multi-head weigher) is different from the one for flour (auger with anti-bridging agitator).

Industrial goods — fasteners, plastic pellets, rubber granules, mineral aggregates — often have irregular shapes or high bulk density that standard multi-head weighers are not designed for. We specify the weigher bucket size and discharge angle based on actual product samples before finalising the line design. Getting this wrong at specification stage is the cause of most industrial product line failures.

Before issuing a quotation, our engineering team reviews your floor plan, product datasheet (bulk density, particle size, flowability) and target output. This review is not a formality — it has changed the machine specification on roughly one in four enquiries, saving those customers from buying a line that would not have performed as expected. The review costs you nothing and takes 24–48 hours.

We share engineering drawings with customers before manufacturing begins — not after. Changes at drawing stage cost nothing or very little. Changes after the panel is wired or the frame is fabricated cost real money and weeks of delay. We hold the drawing review open for 7 days. Most customers use 2–3 of those days. The few who skip the review are the ones who later ask for changes that should have been caught at this stage.

Our CE documentation package covers the Declaration of Conformity, machinery directive technical file, risk assessment, electrical schematic and safety circuit documentation, and the operations and maintenance manual. Every page is in English (other languages available). For buyers importing into the EU or supplying to EU-based customers, this package is not optional — and we know the documentation requirements because we have been supplying CE-certified lines into Europe for over a decade.

Factory acceptance testing at our facility, attended by the customer’s engineer if desired, is included on every line. On-site commissioning is included for turnkey line projects. Operator and maintenance training — covering HMI operation, routine maintenance schedule, common fault diagnosis and spare parts identification — is delivered on-site during commissioning. We do not consider a line commissioned until the customer’s team can run it without us standing next to them.