Net bag weighing and packing line with elevator, combination weigher and net bag machine

Net bag packing

Automatic Net Bag Weighing and Packing Line

A fixed-weight net bag packing line: an inclined elevator feeds a 14-head combination weigher, and the inclined-tube net bag machine bags each weighed portion with automatic net change and a clipped tag — 0.45–5 kg bags at 10–15 bags per minute.

14 × 5 LCombination weigher

0.45–5 kgTarget bag weight

10–15 bags/minNet bag output

304Stainless line

Solution overview

Move from loose produce to weighed, tagged net bags.

The line joins the three stages net bag packing needs to run automatically: an inclined elevator and belt feeder present product to a 14-head combination weigher, and the weighed portion drops straight into the inclined-tube net bag machine, which forms, clips and tags each bag without an operator weighing by hand.

The weigher feeds with belts instead of vibration pans — gentler and more accurate for light, bulky produce such as potatoes, onions, citrus and tomatoes — while the net bag machine's double hoppers alternate so net rolls can be changed without stopping the line.

Process flow

Each stage has a clear job in the line.

Climbing elevator with cleated net chain feeding the weighing line

Feeding the Line

Elevate and Feed

The climbing elevator lifts product on a food-grade PP net chain with cleats — speed is variable from 0 to 20 m/min — and the belt feeding conveyor presents an even, single-layer flow to the weigher.

EquipmentInclined elevator with cleated PP net chain and belt feeding conveyor
PurposeSteady, adjustable product flow into the weighing section

14-head bucket-type combination weigher above the net bag machine

Fixed-weight Portioning

Combine and Weigh

Fourteen 5 L hoppers compose every portion to the target weight — 100–3,000 g per hopper drop, up to 50 dumps per minute. Belt feeding replaces vibration pans, so light, bulky produce is handled gently and weighed accurately.

Equipment14-head combination weigher, 5 L hoppers, digital sensors with dynamic zero tracking
PurposeEach bag leaves the line at the programmed weight, with minimal giveaway

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Inclined-tube net bag machine forming and clipping weighed net bags

Bagging and Tagging

Bag and Tag

The inclined-tube net bag machine takes each weighed portion into a 380–400 mm net roll, clips the bag and — with the optional label clip — inserts the tag automatically. Double hoppers alternate, so net rolls change without stopping, at 10–15 bags per minute.

EquipmentInclined-tube net bag machine with automatic net change and optional tag clip
Output0.45–5 kg net bags, sealed and tagged, ready for market

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Weighed and clipped net bags on the finished-bag conveyor

Finished-bag Handling

Convey and Collect

Finished bags drop to the belt conveyor at up to 12 m/min and gather in the collection tray, where they are counted and taken to case packing — one operator oversees the whole line.

EquipmentFinished-bag belt conveyor and collection tray
PurposeOrderly collection and easy transfer to case packing

Equipment modules

Matched modules instead of a generic machine list.

Module	Role in the workflow	Related detail page
Climbing elevator	Raises product to the weighing section	Core module
Belt feeding conveyor	Evens the product flow into the weigher	Core module
14-head combination weigher	Weighs each target portion	Product page
Inclined-tube net bag machine	Bags, clips and tags each weighed portion	Product page
Finished-bag belt conveyor	Carries sealed bags to collection	Core module
Collection tray	Gathers finished bags for case packing	Core module
Work platform	Operator access alongside the machines	Optional module

Working video

See Automatic Net Bag Weighing and Packing Line in operation.

The working video for this automatic net bag weighing and packing line is being prepared. Meanwhile, see FstTech equipment in operation on the FstTech YouTube channel.

Related equipment

Machines used in this line.

Multihead Weigher

A 14-head bucket multihead weigher for fruit and vegetable lines — belt conveying replaces the traditional vibratory feeder for more even feeding, weighing 100–3,000 g portions at up to 50 dumps per minute.

Mesh Bag Clipping Machine

A fully automatic mesh bag packing machine: from product infeed it forms the net bag from roll stock, tightens the mouth, applies a wine-goblet paper label and closes it with a metal clip — 25–30 bags per minute at 0.5–2.5 kg.

FAQ

Key questions before line planning

What products suit this line?

Solid produce in net bags: potatoes, onions, citrus and tomatoes are the reference applications, and other solid materials pack the same way — firm items that flow on a cleated elevator and drop cleanly into a net bag.

What weight can each bag hold?

0.45–5 kg per bag. The target is set from the control panel and the 14-head weigher composes every portion to it, so bag weights stay consistent without manual weighing.

How fast does the line pack?

The net bag machine outputs 10–15 bags per minute, fed by a weigher rated up to 50 dumps per minute — the combination keeps the bagger supplied without starving.

Can the net bag machine run without the weigher?

It can, but every bag would need weighing by hand first. The elevator, weigher and bagger as one line are what make net bag packing fully automatic at a fixed weight — the usual reason customers buy the complete system.

Tell us your product, target bag weight and hourly output.

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