Autore: BottlingScout Admin

Case Sealers in End-of-Line Packaging

Case sealers close and seal the top flaps of filled cases before palletising. They are the final step in the case packing process and must operate reliably to maintain line efficiency. Used case sealers are widely available and represent straightforward, cost-effective equipment purchases.

Sealing Methods

Critical Inspection Points

• Tape head condition — worn cutting blades and pressure rollers cause uneven tape application
• Flap folding mechanism — inspect folding ploughs and compression bars for consistent flap closure
• Case guiding system — adjustable side rails and top guides must accommodate your case size range
• Hot-melt system — if glue-based, check tank condition, hose integrity, and nozzle cleanliness
• Belt or roller drive — inspect drive belts and rollers for wear that causes case slipping

Common Issues

Problems to Watch For

• Tape not adhering properly due to worn pressure rollers or incorrect tape tension
• Uneven flap closure causing case instability on pallets
• Hot-melt glue stringing or dripping from worn nozzles
• Case size adjustment mechanism seized or difficult to adjust

Frequently asked questions

Should I choose tape or hot-melt glue sealing?

Tape sealing is simpler and lower cost for basic operations. Hot-melt glue provides a cleaner, more tamper-evident seal preferred by retailers. The choice often depends on customer requirements and production volume.

Can a case sealer handle different case sizes automatically?

Automatic case sealers with servo-driven adjustments can change between case sizes with minimal operator intervention. Manual-adjust models require physical adjustment of guides and rails for each size change.

What throughput should I expect from a used case sealer?

Standard case sealers handle 10-30 cases per minute. High-speed models can exceed 50 cases per minute. Match the sealer speed to your case packer output.

Compressed Air in Bottling Operations

Compressed air is one of the primary utilities in any bottling plant, powering pneumatic actuators, blow moulding machines, conveyor systems, and packaging equipment. The compressor system must deliver adequate volume at consistent pressure to maintain production efficiency. Used industrial compressors offer significant savings compared to new units while delivering equivalent performance when properly maintained.

Compressor Types for Bottling

Critical Inspection Points

• Running hours — compressor condition correlates directly with accumulated running hours
• Air end or compression element — the core component with the highest replacement cost
• Oil system (oil-injected) — check oil quality, separator element, and cooler condition
• Control system — verify loading/unloading controls, VFD operation if equipped, and pressure regulation
• Air treatment — inspect downstream dryers, filters, and condensate drains
• Noise and vibration levels — compare to manufacturer specifications for the machine age

Sizing Considerations

Undersized compressor systems cause pressure drops that affect production quality and speed. Calculate total air consumption across all machines in the line, add 20-30% reserve capacity, and account for leakage losses (typically 10-25% in older installations). Consider installing a compressed air management system to optimise energy consumption.

Common Issues

Problems to Watch For

• High running hours without documented air end overhaul — the air end is the most expensive component to replace
• Oil carryover in oil-injected compressors contaminating the air system
• Inadequate air treatment causing moisture in pneumatic systems and product contamination risk
• Undersized receiver tanks causing pressure fluctuations during peak demand
• Outdated control systems unable to efficiently manage loading patterns

Frequently asked questions

Should I choose oil-free or oil-injected compressors for bottling?

Oil-free compressors are required where compressed air contacts the product or packaging materials directly. Oil-injected compressors are suitable for general plant air with proper filtration. Many bottling plants use a combination of both types.

What is the typical lifespan of an industrial compressor?

Well-maintained industrial screw compressors can operate for 15-25 years. The air end typically requires overhaul every 20,000-40,000 running hours. Piston compressors for high-pressure applications may have shorter service intervals.

How do I calculate the compressor size I need?

Sum the air consumption of all machines (specified in Nm³/h at required pressure), add 20-30% reserve capacity, and account for distribution losses. A compressed air audit of your facility provides the most accurate sizing basis.

What Are Decraters?

Decraters (also called uncasers or unpacking machines) extract returnable bottles from plastic or wooden crates at the beginning of a returnable bottle line. They work in conjunction with crate washers and bottle washers to prepare containers for refilling. Used decraters are commonly available as the returnable bottle market evolves.

Decrater Types

• Gripper-head decraters — use mechanical or pneumatic grippers to lift bottles from crates
• Vacuum decraters — use suction cups to lift bottles, suitable for various bottle shapes
• Tilt-type decraters — invert crates to release bottles onto a conveyor
• Servo-driven decraters — modern designs with programmable motion profiles for gentle handling

Critical Inspection Points

• Gripper or suction cup condition — worn components cause dropped bottles and production losses
• Head lifting mechanism — check for smooth operation, bearing condition, and alignment
• Crate conveyor and indexing — crates must be precisely positioned under the extraction head
• Empty crate discharge — verify reliable stacking and discharge of empty crates
• Speed capability — test at rated speed to confirm consistent bottle extraction

Common Issues

Problems to Watch For

• Worn grippers causing bottle drops — the most common issue on used decraters
• Misaligned head causing partial extraction leaving bottles in crates
• Slow cycle times due to worn pneumatic cylinders or fatigued springs
• Crate transport chain wear causing indexing errors

Frequently asked questions

What speed should a decrater match?

The decrater must match or exceed your bottle washer infeed speed. Typical decrater speeds range from 10,000 to 60,000+ bottles per hour depending on the model and crate configuration.

Can a decrater handle different crate sizes?

Most decraters can be adjusted for different crate dimensions and bottle configurations with mechanical setup changes or change parts. Verify compatibility with your specific crate and bottle formats.

Do I need a decrater and a crater?

Returnable bottle lines typically need both: a decrater at the line start to unpack returned bottles, and a crater (or packer) at the end to pack filled bottles back into crates.

Container Handling Equipment in Bottling Lines

Handlers encompass a broad category of equipment that manages container orientation, elevation, and transfer within a bottling line. This includes container turners, twist conveyors, elevators, lowerers, and transfer devices. While often overlooked, these components are essential for smooth production flow and must be compatible with your specific container types and line layout.

Types of Handling Equipment

• Container turners — rotate containers 90° or 180° for specific processing requirements
• Twist conveyors — gradually rotate containers along a conveyor path
• Elevators and lowerers — change container elevation between machines at different working heights
• Laner/combiners — merge or separate container flows between processing stages
• Neck handling systems — grip PET bottles by the neck ring for air conveyor transport

Critical Inspection Points

• Guide rail and handling surface condition — worn surfaces damage containers and labels
• Drive system — check motors, gearboxes, and belts for wear
• Container format compatibility — verify the handler works with your specific bottle dimensions
• Speed rating — ensure the handler can keep pace with your line speed
• Integration points — confirm compatible height, width, and conveyor connections

Common Issues

Problems to Watch For

• Container damage from worn guide surfaces — particularly problematic for labelled containers
• Speed limitations that create line bottlenecks
• Incompatible container formats requiring expensive modifications
• Excessive noise from worn bearings or drive components

Frequently asked questions

Do I need specific handlers for PET vs glass bottles?

Yes — PET and glass bottles require different handling approaches. PET bottles are often transported by neck handling (air conveyors), while glass bottles use slat-band or mat-top conveyors. Handling equipment must match your container type.

How do I determine the right elevator height?

Measure the working height of each machine the elevator connects. The elevator must bridge the height difference while maintaining your required line speed. Include space for accumulation at both the inlet and outlet.

What Is a Filling Monoblock?

A filling monoblock integrates the rinser, filler, and capper into a single synchronised unit sharing a common drive and frame. This configuration eliminates the conveyors and transfer stars between separate machines, reducing footprint, improving hygiene, and minimising container handling. Monoblocks are widely used for water, beverages, wine, spirits, and pharmaceutical liquids. On the used market, monoblocks from manufacturers such as Krones, KHS, Sidel, GEA, AVE, and many Italian builders represent significant value.

Advantages of Monoblock Configuration

• Reduced footprint compared to separate rinser + filler + capper
• Fewer transfer points means less container damage and higher efficiency
• Single drive system simplifies speed synchronisation
• Enhanced hygiene — enclosed design reduces contamination risk
• Lower total energy and compressed air consumption

Critical Inspection Points

Shared Drive System

The monoblock's single drive powers all three functions. Inspect the main gearbox, timing gears, and drive motor carefully. Any wear in the shared drive affects all three operations simultaneously. Check for vibration, noise, and gear backlash at the transfer points between rinser, filler, and capper sections.

Individual Section Evaluation

Each section of the monoblock should be evaluated independently using the same criteria as standalone machines: rinser nozzle condition, filler valve status, and capper chuck or jaw wear. The key difference is that replacing one section is not possible — the entire monoblock must be functional.

Star-Wheel Timing

The transfer stars between monoblock sections are critical. Check timing accuracy, pocket wear, and guide rail condition at each transition point. Poor timing causes container damage and production losses.

Common Issues on Used Monoblocks

Problems to Watch For

• Wear in the shared drive system affecting all three operations — repair costs are higher than on individual machines
• Difficulty sourcing capper change parts if the monoblock uses a proprietary capping head design
• CIP circuit complexity — monoblocks have more complex cleaning paths that must all be verified
• Control system integration — the PLC manages three machines as one, making modifications more complex
• Size limitations — monoblocks are typically designed for a specific speed range and cannot be easily upgraded

Frequently asked questions

Is a monoblock better than separate machines?

Monoblocks offer advantages in footprint, hygiene, and efficiency for standardised production. However, separate machines provide more flexibility for future modifications and easier individual replacement. The choice depends on production requirements and long-term plans.

Can I replace just the filler section of a monoblock?

Generally no — monoblock sections are mechanically integrated and share a common drive. Replacing one section is rarely practical. This is an important consideration when evaluating the overall condition of a used monoblock.

What speeds are typical for used monoblocks?

Used monoblocks are available across a wide speed range, from small units at 1,000-3,000 BPH for wine and spirits, through medium-speed units at 5,000-15,000 BPH, up to high-speed monoblocks exceeding 30,000 BPH for water and soft drinks.

What Are Decappers?

Decappers remove closures from returnable bottles before washing and refilling. They are essential components in returnable bottle lines for beer, soft drinks, and water. The machine must reliably remove various closure types without damaging the bottle finish. Used decappers are widely available as many bottlers upgrade or convert from returnable to one-way packaging.

Decapper Types

• Crown decappers — remove crown corks from returnable glass beer and soft drink bottles
• Screw cap decappers — unscrew caps from returnable PET or glass bottles
• Multi-format decappers — handle multiple closure types with change parts
• Inline decappers — integrated into the conveyor line before the bottle washer

Critical Inspection Points

• Decapping head condition — worn heads fail to grip or remove caps reliably
• Bottle handling — inspect grippers and guides for wear that causes bottle damage
• Cap collection system — verify the removed caps are properly ejected and collected
• Throughput verification — test at rated speed to confirm consistent decapping
• Safety systems — decappers handle sharp cap edges and require proper guarding

Common Issues

Problems to Watch For

• Worn decapping heads causing incomplete cap removal — replacement heads should be readily available
• Bottle neck damage from misaligned grippers — particularly problematic with lightweight glass bottles
• Cap jam in the ejection chute — caused by worn guides or incorrect chute geometry
• Inconsistent performance with partially opened or damaged caps

Frequently asked questions

Do I need a decapper for a returnable bottle line?

Yes, if processing returned bottles with caps still attached. The decapper sits upstream of the bottle washer. Some bottle washers include an integrated decapping function, but standalone decappers offer more documented performance at higher speeds.

Can a decapper handle mixed cap types?

Multi-format decappers can handle different closure types with appropriate change parts. However, mixing crown and screw caps in the same production run is generally not practical — the line is typically set up for one closure type per run.

What speeds are available for used decappers?

Decapper speeds range from 5,000 to over 60,000 bottles per hour depending on the model and closure type. Match the decapper speed to your bottle washer and filler capacity.

The Role of Case Erectors in Packaging Lines

Case erectors automatically form flat corrugated blanks into open cases ready for filling by a case packer. They are essential for top-load case packing operations where pre-formed cases are required. Used case erectors offer documented performance when properly maintained, as they are mechanically straightforward machines.

Types of Case Erectors

• Bottom-seal erectors — form the case and seal the bottom flaps with tape or hot-melt glue
• Tray formers — form open trays from flat blanks for tray-pack or tray-shrink applications
• Automatic magazine-fed — high-speed erectors drawing from large blank magazines
• Semi-automatic — operator-assisted forming for lower-volume production

Critical Inspection Points

• Blank magazine capacity and feeding mechanism — worn suction cups or misfeed sensors cause stoppages
• Forming section — check folding arms, guides, and compression plates for wear and alignment
• Sealing system — inspect tape heads or hot-melt glue nozzles for consistent sealing quality
• Blank size range — verify the machine accommodates your case dimensions with available change parts
• Erected case squareness — a properly functioning erector produces perfectly square cases

Common Issues

Problems to Watch For

• Worn suction cups causing blank feeding failures — inexpensive but frequently overlooked
• Hot-melt glue system with carbonised adhesive blocking nozzles
• Misaligned forming arms producing out-of-square cases that jam in the case packer
• Limited blank size range without expensive change parts

Frequently asked questions

Do I need a case erector if I have a wrap-around case packer?

No — wrap-around case packers form the case around the product, eliminating the need for a separate case erector. Case erectors are only needed for top-load or side-load case packing operations that require pre-formed cases.

What speed should a case erector match?

The case erector should exceed your case packer speed by at least 10% to ensure a buffer of formed cases is always available. Typical speeds range from 5 to 30+ cases per minute depending on case size.

Can a case erector handle different case sizes?

Most case erectors accept a range of case sizes with mechanical adjustments or change parts. Verify the adjustment range covers all your required formats before purchasing.

What Are Case-Packing Monoblocks?

Case-packing monoblocks integrate case erecting, product loading, and case sealing into a single compact machine. This configuration reduces footprint, eliminates conveyor connections between separate machines, and simplifies line integration. Used monoblocks from established packaging equipment manufacturers offer documented service history for medium to high-speed operations.

Advantages Over Separate Machines

• Reduced footprint — single machine replaces three separate units
• Simplified synchronisation — all functions share a common control system
• Fewer transfer points — reduces jam potential between stations
• Lower total investment compared to three separate machines
• Single operator interface for all functions

Critical Inspection Points

• Magazine and blank feeding — the erecting section must reliably form cases from flat blanks
• Product grouping and loading — inspect pushers, grippers, and dividers for wear
• Sealing quality — verify consistent glue application or tape sealing on closed cases
• Format change capability — monoblocks often have limited format flexibility compared to separate machines
• Control system — evaluate PLC and HMI condition as the integrated control is more complex

Common Issues

Problems to Watch For

• Limited format range compared to separate machines — verify all your case sizes are supported
• Higher complexity for troubleshooting — problems in one section can affect the entire monoblock
• Difficulty accessing internal components for maintenance due to compact design
• Longer changeover times compared to well-designed separate machine configurations

Frequently asked questions

When should I choose a monoblock over separate machines?

Monoblocks are ideal when floor space is limited, production runs are long with few format changes, and simplicity of integration is valued. Separate machines offer more flexibility for frequent format changes and easier individual maintenance.

Can a case-packing monoblock handle wrap-around cases?

Some monoblocks combine wrap-around forming with product loading. Others use top-load with pre-formed cases. Verify the specific machine type matches your packaging format requirements.

What speeds do case-packing monoblocks achieve?

Typical speeds range from 10 to 40+ cases per minute depending on case size and configuration. High-speed monoblocks for beverage applications can exceed 50 cases per minute.

Bag-in-Box: A Growing Packaging Format

Bag-in-box (BIB) packaging has grown significantly across wine, juice, water, liquid food, and industrial chemical markets. The format offers extended shelf life, reduced packaging weight, and lower transport costs compared to glass bottles. Used BIB filling equipment represents an affordable entry point for producers looking to add this format to their product range.

BIB System Components

• Bag filler — fills the inner bag through the tap fitment
• Bag sealer or tap inserter — if filling pre-made bags without taps
• Box erector — forms the outer corrugated case
• Box loader — places the filled bag into the case
• Box closer — seals the outer case

Semi-Automatic vs Automatic Systems

Critical Inspection Points

• Fill valve condition — BIB fillers use specialised valves that mate with the bag tap fitment. Inspect for wear and seal integrity.
• Vacuum or gas flushing system — many BIB fillers use vacuum or nitrogen flushing to remove oxygen before filling. Verify system functionality.
• Weighing system — most BIB fillers use weight-based fill control. Calibrate and verify accuracy.
• Tap fitment compatibility — ensure the machine handles your required tap type and bag size range
• Sanitary design — for food and beverage applications, verify CIP capability and product-contact surface condition

Common Issues

Problems to Watch For

• Worn fill nozzle seals causing leaks during filling — this is the primary wear item on BIB fillers
• Inaccurate weighing system leading to underfill or overfill — calibration drift is common on older machines
• Limited tap compatibility — some machines only work with specific tap manufacturers
• Inadequate vacuum system for oxygen-sensitive products like wine

Frequently asked questions

What products can be filled with bag-in-box equipment?

BIB is used for wine, juice, water, liquid eggs, dairy products, sauces, edible oils, and industrial chemicals. The bag material and tap type are selected based on the product requirements.

What sizes can bag-in-box machines handle?

Common BIB sizes range from 1.5 litres to 20 litres for consumer products, and up to 1,000 litres for industrial applications. Verify the machine handles your required size range before purchasing.

Is bag-in-box suitable for carbonated products?

Standard BIB is not suitable for carbonated products due to the flexible bag structure. However, some specialised BIB systems exist for lightly carbonated beverages using reinforced bags.

What Are Wrap-Around Packers?

Wrap-around packers form corrugated cases directly around grouped products from flat blanks, combining case forming and product packing in a single operation. This eliminates the need for a separate case erector and reduces corrugated material usage compared to pre-formed cases. Used wrap-around packers from established manufacturers such as ACMI, Ocme, SMI, and others are popular choices for beverage packaging lines.

How Wrap-Around Packing Works

• Products are grouped into the required pack pattern on a flat blank
• The blank is folded up around the product group using forming ploughs and compression bars
• Side panels, top flaps, and end flaps are folded and glued in sequence
• Hot-melt adhesive secures all flaps to create a rigid, fully enclosed case
• The finished case exits the machine ready for palletising

Advantages of Wrap-Around vs Top-Load

Critical Inspection Points

• Blank magazine and feeding — suction cup condition and blank separation reliability
• Grouping head — product collation accuracy and pusher/divider condition
• Forming section — folding plough alignment and compression bar adjustment
• Hot-melt glue system — tank, hoses, and nozzle condition for consistent adhesive application
• Finished pack quality — squareness, glue bond strength, and closure integrity
• Change part inventory — wrap-around packers require extensive format-specific tooling

Common Issues

Problems to Watch For

• Poor blank quality causing forming errors — the machine is only as good as the corrugated blanks it receives
• Hot-melt glue system issues (carbonised adhesive, blocked nozzles) causing weak bonds
• Misaligned forming sections producing out-of-square cases
• Long changeover times when switching between different pack formats
• Worn grouping head components causing product misalignment before wrapping

Frequently asked questions

What is the speed range of wrap-around packers?

Used wrap-around packers range from 15 packs per minute for smaller machines to over 60 packs per minute for high-speed models. Speed depends on pack size and the number of products per case.

Can a wrap-around packer handle different product types?

Most wrap-around packers can handle bottles, cans, and jars with appropriate change parts and blank designs. However, each product and pack configuration requires specific tooling and blank specifications.

How does blank quality affect machine performance?

Corrugated blank quality is critical for wrap-around packers. Blanks must have consistent dimensions, proper flute direction, and appropriate board grade. Poor blank quality is the single most common cause of wrap-around packer stoppages.