Wood pellet production line in Germany

RICHI MACHINERY

Keep painted wood and board dust out of the feedstock

The wood pellet production line in Germany is designed around clean, untreated wood. Sawdust from cutting solid spruce is a different material from sanding dust collected after a surface finish has been applied. Mixing them in one collection system would make later separation difficult, even if the combined material looks like ordinary brown wood dust.

Workshop stream	Use in this line
Untreated spruce sawdust	Main feedstock; check size and moisture
Clean planer shavings	Grind and feed steadily
Untreated solid-wood offcuts	Primary reduction, then grinding
Unfinished solid-wood sanding dust	Assess separately before controlled blending
Painted wood and mixed board dust	Keep outside this clean-wood supply

The wood is described at 8–12% moisture. That supports a route without a separate dryer, but it does not mean every delivery should be pressed at any value within that range without adjustment. A very dry, fine batch may need different conditioning from coarser shavings. Moisture is checked where the wood enters the pellet process, after workshop collection and storage.

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Give each wood form the preparation it actually needs

Sawdust, curled shavings and solid offcuts do not behave alike in a hopper. Sending all three through an identical route can either waste grinding effort or leave pieces too large for stable feeding. This dry sawdust pellet line in Germany is better understood as several preparation paths joining at one controlled feed stream.

Sawdust needs checking before more grinding

Clean sawdust is screened and checked for oversize pieces and foreign material. Material already within the agreed pellet-feed specification can avoid unnecessary size reduction. Finer is not automatically better: excessive grinding adds load and changes how the powder flows, while a broad mix of sizes can make feeding less predictable.

The workshop should take representative samples rather than judge the whole supply from a handful of the finest dust. A sample containing both normal sawdust and occasional splinters gives the equipment selection a more useful basis.

Shavings and offcuts need different handling

Light planer shavings take up a lot of space for their weight and can hang above a narrow outlet. The feed system needs to draw them down steadily. Grinding brings them closer to the size and shape of the sawdust, so the press receives a less variable mixture.

Solid offcuts first need a suitable chipper or other primary reducer; a fine-grinding mill should not be treated as a machine for swallowing arbitrary furniture pieces. Prepared chips can then pass through the wood grinder. Hardware and unsuitable glued or coated pieces are removed before this route.

One press matched to the 2–2.5 T/H duty

For this output target, the engineering selection is one MZLH678 with a 200 kW main motor. Its reference wood-pelleting range is 2.5–3 T/H, leaving a more suitable starting point for the requested duty than a smaller press working beyond its normal range. The final rate still depends on the spruce mixture, moisture, die and proportion of accepted pellets.

A controlled feeder matters because the press cannot smooth out every interruption upstream. A surge of light shavings followed by dense sawdust changes the load. A well-mixed holding supply and steady discharge make it easier for the operator to maintain a consistent feed rate.

Die selection follows the product to be sold. A 6 mm heating pellet is a useful design brief, but it is not evidence that this customer has already sold a particular grade. Other diameters need agreement with the buyer and a matching die; they should not be added to the case as confirmed products.

Access around the die, rollers and drive also belongs in the layout. The point of a single suitably sized machine is to keep the process straightforward, with enough room to service the press rather than squeeze several small presses into the same area.

Cooling comes before the final size check

Pellets leave the die warm and soft. A counterflow cooler lets them lose heat and settle before they are graded and bagged. Cooling air and discharge settings are matched to the actual pellet stream; a second chilled-air stage is not a routine requirement for this dry-wood project.

The screen removes loose fines and broken pieces after cooling. Clean fines may return to the same compatible wood recipe. They remain material inside the process, so counting them once at the press and again on their return would overstate production.

Pack pellets only after they have cooled

Hot pellets can put moisture into the air inside a closed bag. Allowing the product to cool before packing helps avoid that problem. The bagging specification also needs to include closing, bag removal and pallet handling; weighing speed alone is not the speed of the whole packing station.

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Choose the first product before promising other applications

Heating pellets are the main product brief for this furniture residue pellet plant in Germany. Wood pellets may have other uses, but each use changes what the buyer expects. The table separates possible applications from claims that would need their own product development or test results.

Possible outlet	Decision before production
Heating fuel pellets	Agreed diameter and buyer specification
Industrial wood fuel	Boiler acceptance and pellet quality
Animal bedding or litter	Separate hygiene, dust and absorbency assessment
Specialist carriers or absorbents	Dedicated product-development work

Clean spruce is a sensible starting material for wood fuel. It does not automatically make the pellets ENplus A1, nor does buying a pellet machine provide certification. Any claimed quality class must follow the applicable testing and certification process. For a buyer who requires a certified grade, both the product and its production system need to meet the scheme’s requirements.

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Equipment follows the wood stream rather than a fixed shopping list

The line needs preparation and finishing around the main press, but the exact front end depends on how much of the supply is sawdust, shavings or offcuts. The following selection describes the required jobs. Auxiliary capacities are checked against the material samples and desired output before the equipment schedule is finalised.

Equipment duty	Engineering selection
Offcut preparation	Primary reducer where required
Wood grinding	Sized for the prepared mixture
Holding and controlled feeding	Reliable discharge of light wood
wood pellet mill	One MZLH678; 200 kW main motor
Cooling	Matched counterflow cooler
Screening	Fines separation and compatible return
Packing	Weighing, closing and pallet handling

No separate dryer is included for the stated dry feedstock. That saving depends on keeping rain-wet wood and fresh chips out of this supply. Metal separation and suitable screening are still needed: clean-looking workshop residues can contain screws, staples or fragments from handling. The existing collection equipment also needs a capacity check before another machine is connected to it.

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Separate the streams before they reach a common holding bin

Sorting is easiest beside the machine that creates the residue. Once several workshop streams have entered one silo, it may be too late to distinguish unfinished solid wood from dust containing board, glue or surface coatings. This is the most important material-handling decision for the project.

At the furniture machines

• Collect untreated solid-wood sawdust separately.
• Keep board machining and coated-wood residues apart.
• Identify which sanding operations produce suitable wood dust.

At the collection point

• Check for metal and oversized pieces.
• Keep the material sheltered from rain.
• Record changes in species and workshop operations.

At the pellet feed point

• Blend compatible prepared wood for steady feeding.
• Measure moisture after storage, not only at collection.
• Set aside unfamiliar or mixed material for assessment.

For a Bavarian furniture business, those routines connect pellet production to normal workshop work. A change in the furniture order mix may change the residue mix too. The pellet operator needs to know when a new wood species, panel product or finishing operation is introduced upstream.

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How much bagged product can 2.5 tonnes of wood provide?

The material brief mentions roughly 2.5 tonnes of wood per hour. That should not be turned directly into a promise of 2.5 tonnes of bagged pellets. Removing water reduces weight, and any rejected material has to be allowed for as well. The example below isolates the moisture effect, assuming no dry-wood loss.

Illustrative moisture balance	Hourly quantity
Prepared wood at 12% moisture	2,500 kg
Dry wood entering and leaving	2,200 kg
Pellets at 10% moisture	2,444.4 kg
Water remaining in pellets	244.4 kg
Water removed	55.6 kg

At those example moisture levels, a full 2.5 T/H of finished pellets would need about 2.56 T/H of prepared wood before allowing for any external rejects. That is why the raw-material supply should be checked independently of the press rating. Screening returns can circulate internally, but they do not create more wood.

Packing example	At 2 T/H	At 2.5 T/H
15 kg bags	About 133 bags/hour	About 167 bags/hour
25 kg bags	80 bags/hour	100 bags/hour

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Fit pellet production around the furniture schedule

The workshop creates the feedstock, so its shift pattern sets the starting point for pellet planning. A press that can handle the hourly target is useful only while suitable prepared material is available. Holding capacity can bridge short interruptions; it cannot compensate indefinitely for a smaller average wood supply.

When furniture production is busy

Measure the residue produced over representative shifts, including the share that is suitable for this line. Total collection-system weight is not necessarily usable pellet feed. Keep the wood-form breakdown as well: two tonnes of light shavings need a different preparation and storage arrangement from two tonnes of ready-sized sawdust.

Offcuts also take preparation time. If the chipper and grinder run only during part of a shift, they need to build enough prepared stock for the hours when the press is running.

When the pellet press stops

The workshop may continue producing residues while the pellet line is stopped for a die change or other work. The collection and holding arrangement needs room for that material, with a clear route for moving it onward. Otherwise, a short pellet-line interruption can become a furniture-production problem.

Available silo volume is only useful when its contents can be discharged. The design needs to consider the lightest shavings, the tendency to bridge and access for dealing with an interrupted feed—not simply choose a large volume from a drawing.

When the wood mixture changes

A larger hardwood share or more sanding dust can change grinding, feeding and pressing behaviour. Try the new mixture in a controlled run and compare usable output and pellet condition with the regular spruce mix. Keep that change visible rather than mixing unfamiliar material into the entire holding stock.

A simple record of wood source, moisture, operating date and packed lot is enough to make the first comparisons useful. Elaborate tracking software cannot replace knowing what entered the press.

When a customer changes the bag order

A larger share of small bags raises handling work even if pellet tonnage stays the same. Check the complete packing cycle, the space for empty bags and the movement of filled pallets before accepting a different dispatch pattern.

Finished bags also need dry storage. Planning only for the pellet machinery leaves out the place where the product waits for collection, and can make an otherwise compact line awkward to operate.

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Check the next constraint before expanding

Start with the available wood and the finishing capacity

• Confirm usable dry-wood supply over a normal production week.
• Check grinding, holding and packing before increasing press output.
• Allow access and services for the equipment actually being added.

Bring these details to the next equipment discussion

• Wood species, collection sources and representative samples.
• Moisture range and the sawdust-to-offcut mix.
• Required pellet diameter, bag size and production hours.

Talk through the furniture residues you already have

For a wood pellet production line in Germany, send RICHI the residue types and quantities alongside the desired pellet output. Photos of the collection points, samples of the dry wood and the available building layout help establish whether the supply can follow this route without drying and what preparation the offcuts need.

The decision is easier when those details are clear: keep suitable wood separate, prepare each form properly, use one press matched to the duty and leave enough capacity for cooling and packing. That gives a furniture producer a concrete line to assess, with the daily workshop supply at the centre of the proposal.