A specification guide for heavier open-mouth bags and operator-presented packs where product flow, weigh-hopper volume, bag support, dust control and safe handling shape the complete line.
A target of 5 kg to 30 kg does not identify one universal machine. Dense free-flowing granules, low-density animal feed, dusty powders, abrasive minerals and irregular components need different hopper volumes, feed controls, contact materials, dust measures and discharge arrangements.
The specification should cover the full path from bulk product supply to the closed or transferred bag. For operator-presented open-mouth bags, the bag clamp, support height, release sequence and take-off method are part of the production cycle. For automatic lines, bag presentation, filling permission, discharge, closing and downstream availability require a defined controls interface.
Use product and pack evidence to choose the route before comparing individual machine configurations.
Product is accumulated in a separate weigh hopper and released into the bag after the target is reached. The bag does not normally form part of the weighing system, which can support a fast repeatable discharge when the product and hopper volume are suitable.
The bag and support are weighed while product is added. This can simplify the transfer path but the bag clamp, support and movement around the scale must not create unstable forces or tare errors.
Separate or alternating feed paths can improve the overall cycle for suitable products, but the combined discharge, bag presentation, refill and downstream closing stages remain possible bottlenecks.
Often considered for powders that need positive controlled feed rather than vibration. Product aeration, compaction, dust and cleaning requirements must be tested on the actual material.
Test the factors that can change a stable laboratory result into an unstable production cycle.
The largest product volume must fit with working allowance. Refill should not shock-load the weigh system or change product density enough to destabilise the feed profile.
The bag must be held securely and released predictably. Clamp contact, operator pull and take-off movement should not affect the weighing signal or create a spill risk.
Dusty material may require a close-fitting spout, extraction connection and a cleaning method that prevents retained product from affecting later fills.
Heat sealing, stitching, folding, coding and conveyor transfer can set the accepted throughput. The line should stop in a controlled way if downstream equipment is unavailable.
Only one current verified Lancing model page extends into the lower part of this band. Higher targets require a project-specific hopper, feeder, bag and site assessment rather than an assumed model claim.
| Route | How to use the reference |
|---|---|
| LU-DL5000D dual-head reference | Reference weighing range 100–10,000 g, published output approximately 20–30 bags/minute and supplier accuracy reference approximately 2–6 g, all dependent on product and operating conditions. Two reference hoppers are approximately 25 litres each. Open the supporting page |
| Weigh-hopper systems | Use the weigh-hopper guide to compare isolation, zero stability, product retention, load-cell contact and controlled discharge before selecting a heavier bagging route. Open the supporting page |
| Bag-clamping systems | Review bag mouth, clamp, support, operator access and discharge clearance as part of the line rather than treating the filler as a stand-alone component. Open the supporting page |
Record consecutive finished bags using representative product, the normal refill method and the intended closing or take-off sequence. Note zero checks, tare, net weight, refill events, spill, dust escape, incomplete discharge, manual intervention and rejected bags.
Report mean, sample standard deviation, minimum, maximum, range and results outside the agreed acceptance band. Where packaged-goods or legal-metrology obligations apply, the responsible packer should confirm the applicable controls and verification arrangements for the actual product and pack. General machine trials do not replace that site-specific assessment.
