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Secondary & End-of-Line Packaging Solutions
Secondary & End-of-Line Packaging Solutions

Random Product Weighing & Packaging Solution

What Is Random Product Weighing & Packaging Solution?

A random product weighing and packaging solution packs loose products according to a preset target weight without requiring every item to be oriented or counted individually.
Products are supplied to the weighing system in bulk. A distribution mechanism separates the product into several weighing hoppers. The control system compares the weight held in each hopper and selects a combination that is close to the required package weight.
The selected product portion is then discharged into the packaging machine.
This process is suitable when:
-  Products enter in no fixed order. 
-  Individual pieces vary in size or weight. 
-  The finished package is sold by net weight. 
-  Exact piece counting is unnecessary. 
-  Products can flow through the weighing and discharge system. 
-  High-volume repeated portioning is required. 
The main challenge is maintaining both weighing performance and product condition.
Sticky products may not leave the hoppers cleanly. Fragile products can break during vibration or dropping. Frozen products may create condensation. Lightweight items may bridge inside chutes, while large irregular pieces may block narrow discharge paths.
The weighing system, contact surfaces, hopper size, vibration settings, discharge height, and packaging machine must therefore be selected according to the actual product.

 

 

How to Choose the Right Random Product Weighing & Packaging Solution?

The weighing system should be selected according to how the product behaves in motion, not only according to the required target weight.
Manufacturers should consider:
-  Product type 
-  Individual piece size and weight 
-  Variation between individual pieces 
-  Product flowability 
-  Stickiness or oil content 
-  Fragility 
-  Frozen or ambient condition 
-  Target package weight 
-  Required weighing accuracy 
-  Permitted product giveaway 
-  Required bags per minute 
-  Package dimensions 
-  Rollstock film or premade pouch 
-  Maximum drop height 
-  Cleaning requirements 
-  Number of SKUs 
-  Changeover frequency 
-  Inspection requirements 
-  Case packing and palletizing needs 
For example, small free-flowing snacks usually provide many possible weight combinations. Large frozen pieces may require larger hoppers and wider discharge chutes. Sticky products may need special contact surfaces or controlled feeder settings. Fragile products require reduced vibration and lower drop heights.
Representative product samples should be tested because nominal product dimensions cannot fully show how the product flows, separates, and discharges during actual operation.

 

 

 

Random Product Weighing & Packaging Solution Video

Watch how loose products are supplied in bulk, elevated, distributed across the weighing system, combined to the target weight, discharged into bags, sealed, inspected, and transferred to secondary packaging.
The video can show product feeding, multihead weighing, timing-hopper discharge, vertical bag forming, filling, sealing, checkweighing, metal detection, case packing, and palletizing.
The final system depends on product flowability, target weight, package dimensions, required accuracy, production output, and packaging material.

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SOLUTION MACHINE

Machines Included in Random Product Weighing & Packaging Solution

The equipment is configured around product behavior during bulk feeding, weighing, and discharge. 
 

Bulk Product Feeding System
The bulk feeding system receives products from the production line, storage container, manual loading station, or upstream processing equipment.
Its purpose is to provide a controlled supply rather than sending too much product into the weighing system at once.
The feeding method may use a conveyor, vibrating feeder, hopper, or other product-specific transfer equipment.
The product supply should remain stable because insufficient feeding reduces output, while excessive feeding can overload the distribution system and affect weighing performance.
 

Product Elevator or Inclined Conveyor
An elevator or inclined conveyor transfers loose products to the weighing machine.
The selection depends on product fragility, stickiness, size, hygiene requirements, and installation height.
Bucket elevators are commonly used for free-flowing products. Inclined belt conveyors may be more suitable for fragile or sticky items that require gentler movement.
The transfer height should be limited where product breakage or coating damage is a concern.
 

Distribution Feeder
The distribution feeder spreads products from the central inlet toward the individual weighing channels.
Uniform distribution helps each weighing hopper receive enough product to participate in the combination calculation.
Products that accumulate on one side of the distribution plate can reduce the available combinations and affect output.
Vibration intensity and feeding time should be adjusted according to product size, density, and flowability.
 

Multihead Combination Weigher
The multihead weigher divides products among several hoppers and selects a combination that approaches the preset target weight.
It is commonly used for snacks, confectionery, frozen products, dry food pieces, pet food, hardware items, and other loose products suitable for weight-based portioning.
A product made of many small pieces generally provides more possible weight combinations than a product consisting of a few large pieces.
 

Linear Weigher
A linear weigher may be used for simpler products, lower output, larger target weights, or applications where a multihead combination system is unnecessary.
Products are fed into one or several weighing channels until the required weight is reached.
The choice between linear and multihead weighing depends on product characteristics, capacity, accuracy expectations, and investment requirements.
 

Timing Hopper and Discharge Chute
A timing hopper can temporarily hold the selected product portion before releasing it into the packaging machine.
It helps synchronize the weighing cycle with bag formation and sealing.
The discharge chute guides the product into the open bag. Its dimensions and angle should prevent bridging, blockage, excessive impact, or product loss.
Large or lightweight products may require a wider chute. Fragile products may need a shorter drop distance or staged discharge.
 

Vertical Form Fill Seal Machine
The vertical packaging machine forms a bag from rollstock film, receives the weighed product, and seals the package.
It can create different pillow-style and gusseted bag formats according to the machine configuration.
The bag width, length, sealing system, film structure, and filling tube are selected according to the product volume, target weight, and required package presentation.
The machine cycle must remain synchronized with the weighing system so that every product portion enters a fully opened bag.
 

Premade Pouch Packaging Machine
A premade pouch machine can be used when the product requires a preformed pouch, stand-up format, zipper, or other retail feature.
The weighing system discharges each portion into an opened pouch before sealing.
Pouch opening size and product discharge behavior must be evaluated carefully, especially for bulky or irregular products.
 

Inspection System
The line can include a checkweigher, metal detector, X-ray system, seal inspection, or code verification according to the product and quality requirements.
The checkweigher verifies the completed package weight after sealing. It does not replace the main dosing system but provides an independent downstream check.
Rejected packages can be removed before case packing.
 

Case Packing and Palletizing System
Finished bags or pouches can be accumulated, counted, arranged, packed into corrugated cases, and palletized.
Flexible packages may need flattening, air removal, orientation control, or controlled overlap before entering the case packer.
The downstream system should be designed around the actual shape of the filled package, not only the empty bag dimensions.

WHAT PACKAGING SOLUTIONS ARE AVAILABLE FOR BREAD & BAKERY?

Packaging Formats for Random Product Weighing & Packaging

Random weight-based products can be packed in several flexible package formats.

  • shape-1

    Pillow Bag Packaging

    The standard pillow bag features a simple and efficient sealing structure, making it one of the most widely used flexible packaging formats. It is suitable for a wide range of products across food, daily goods, and industrial applications.

  • shape-2

    Gusseted Pillow Bag

    A pillow bag with additional gusset folds on the side or bottom, providing increased capacity and better package stability. It is suitable for products requiring more volume or improved shelf appearance.

  • shape-4

    Pillow Bag with Euro Hole

    A pillow bag equipped with a reinforced Euro hole for hanging display. It provides a practical retail presentation option while maintaining the advantages of the pillow bag structure.

  • Premade Pouch Packaging

    Premade Pouch Packaging

  • Premade Pouch Packaging

    Premade Pouch Stand-up Pouches Packaging

    Stand-up pouches feature a bottom gusset that allows the package to stand upright on shelves, combining strong product presentation with efficient use of packaging material. They are widely used for snacks, coffee, pet food, powders, liquids, and other consumer products.

  • soontrue-group-Flat-bottom-doypack

    Flat Bottom Doypack

    Flat bottom doypacks feature a stable flat base that allows the pouch to stand upright while providing a structured, premium appearance. They are commonly used for coffee, snacks, pet food, nuts, powders, and other products that benefit from strong shelf presentation.

  • soontrue-group-zipper -premade-pouch

    Zipper Premade Pouches

    Zipper pouches feature a resealable zipper that allows consumers to open and close the package repeatedly while helping maintain product freshness. They are commonly used for snacks, coffee, nuts, pet food, powders, and other products requiring convenient reclosure.

FAQ

Random Product Weighing & Packaging Solution FAQs

Q1: What products are suitable for random weighing and packaging?

Suitable products may include snacks, confectionery, frozen foods, dry food pieces, pet food, hardware items, and other loose products that can be fed, weighed, and discharged reliably.

Q2: Does the product need to be arranged before weighing?

No. Products can enter the weighing system randomly. They still need to be distributed evenly enough for the weighing hoppers to work efficiently.

Q3: Is the package controlled by weight or by piece count?

This solution is primarily controlled by target weight. A separate counting system is generally more appropriate when the package must contain an exact number of pieces.

Q4: What affects weighing accuracy?

Accuracy is affected by individual piece weight, product variation, hopper quantity, feeding stability, target weight, operating speed, product residue, and weighing settings.

Q5: Can fragile products be weighed automatically?

Yes, subject to product testing. Reduced vibration, gentler feeding, shorter drop heights, and product-specific contact surfaces may be required.

Q6: Can sticky or oily products use a multihead weigher?

Some sticky or oily products can be handled with suitable hopper surfaces, feeder settings, discharge angles, and cleaning provisions. Feasibility depends on the actual product.

Q7: Can the same line handle different target weights?

Approved weights can be stored as recipes, but large differences in package volume may require filling-tube changes, film-width changes, or adjustments to the weighing and bagging system.

Q8: What information is needed before designing the solution?

Useful information includes product samples, product dimensions, individual piece-weight range, target package weights, required accuracy, target speed, product temperature, oil or moisture condition, package drawings, film or pouch samples, cleaning requirements, SKU list, factory layout, and downstream packing requirements.

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