Oct.26, 2026
A 30 m³/day non-autoclaved aerated concrete (NAAC) block production line should be configured around accurate material batching, controlled foam generation, efficient mixing, suitable molds, reliable cutting, and sufficient curing space. Unlike conventional autoclaved aerated concrete (AAC) plants, NAAC production does not require high-pressure steam autoclaves, which can reduce investment in autoclave-related equipment and infrastructure. Hengde provides NAAC block production line solutions that can be configured according to daily output, raw materials, block dimensions, factory space, and automation requirements.
For a small block factory, the objective is to coordinate each production stage without purchasing unnecessary automation. A compact line may use a combination of mechanical batching, a dedicated mixer, a physical foam generator, reusable molds, a cutting system, and manual or mechanical block handling.
The exact equipment list depends on the production process, raw materials, target density, and finished block specifications.
| Production stage | Main equipment | Key configuration consideration |
| Raw material storage | Silos, hoppers, or bag-feeding equipment | Match storage capacity to daily consumption and delivery frequency |
| Material batching | Cement or fly ash metering, aggregate batching, and water measurement | Maintain consistent mix proportions |
| Foam preparation | Physical foam generator, air compressor, and dosing lines | Produce stable foam with a suitable density and bubble structure |
| Mixing and pouring | Lightweight concrete mixer and pouring arrangement | Distribute foam evenly without excessive bubble damage |
| Molding and pre-curing | Reusable molds and a designated pre-curing area | Provide enough molds for setting and handling cycles |
| Demolding and cutting | Mold-release equipment, hoist or clamp, and wire cutter | Match cutting capability to green-body strength and required block dimensions |
| Curing and storage | Covered curing area, handling equipment, and pallets | Allow sufficient space and time for strength development |
Hengde's lightweight block and wall panel equipment can be evaluated by production stage when deciding whether a complete line or selected machines are more appropriate for the project.
Material consistency is fundamental to NAAC block quality. Variations in cement, sand or fly ash, water, admixtures, and foam can affect slurry density, pore distribution, dimensional stability, and compressive strength.
A small plant can consider one or more compact storage silos, bag-feeding equipment, or a combination of the two. The choice depends on whether raw materials arrive in bulk, in bags, or through local suppliers.
Before selecting storage equipment, estimate daily material consumption using the proposed mix design. Allow for delivery intervals, material moisture, handling losses, and available site space.
The batching system should measure each material within the tolerance required by the production process. Cementitious materials, aggregates, water, and admixtures may require different measurement arrangements.
Do not specify a universal ±1 kg batching accuracy without confirming the scale capacity, resolution, calibration, and operating conditions. The supplier should provide the actual equipment specifications and explain how they relate to the intended batch size.
A dedicated lightweight concrete mixer should distribute the base slurry and foam uniformly. Mixing time and speed need to be established through production trials because excessive mixing can damage foam bubbles, while insufficient mixing can create uneven density.
The mixer should also provide adequate working volume for the intended output and batch cycle. A machine that appears suitable by motor power alone may still be undersized if its effective batch volume or discharge time does not support the required production schedule.
Physical foam generation is commonly used in foam-based NAAC production. A foam generator combines a suitable foaming agent solution with compressed air to create foam that is introduced into the base slurry.
Three factors are particularly important:
Foam stability: The foam should remain sufficiently stable during mixing, pouring, and early setting.
Foam density: Variations can affect the final block density and pore structure.
Dosing consistency: Repeatable foam addition helps maintain consistent batch performance.
The foaming agent dilution ratio must follow the chemical supplier's instructions. A ratio such as 1:40 may be appropriate for a particular product, but it should not be treated as a universal setting.
The air compressor, foam generator, metering arrangement, and mixer should be selected as a coordinated system. During commissioning, record the foam preparation parameters and verify the fresh slurry density before proceeding to full production.
Mold quantity depends on mold volume, filling time, pre-curing duration, demolding procedure, and the number of production hours available each day.
A simple planning calculation is:
Daily output = usable mold volume × completed mold cycles per day
For example, if each mold holds 0.864 m³ of usable slurry, producing 30 m³ would require approximately 35 completed mold cycles per day. This is an illustrative calculation, not a recommended mold specification; actual usable volume and production yield must be confirmed.
A commonly referenced mold envelope is approximately 1.2 m × 1.2 m × 0.6 m, but external dimensions do not necessarily equal usable filling volume. Confirm the internal dimensions, freeboard, and required green-body size with the equipment supplier.
Estimate how long each mold remains occupied, from pouring through pre-curing and release. Then account for mold return, cleaning, preparation, and the time needed to move the green body to the next process.
The required mold pool is approximately:
Molds required = mold cycles per day × mold occupancy time ÷ daily production hours
Round the result upward and add an appropriate allowance for cleaning, handling delays, and unexpected interruptions. A supplier should verify the final quantity against the actual production schedule rather than relying on a fixed number of mold sets.
NAAC production depends on the green body reaching sufficient strength for safe demolding and cutting. If cutting begins too early, blocks may deform, crack, or lose their edges. If the process is delayed unnecessarily, mold turnover slows and daily capacity can fall.
Provide a designated area where freshly poured material can set under controlled conditions. The required pre-curing time depends on the cementitious system, water-to-binder ratio, foaming system, ambient temperature, and other mix-design variables.
Avoid assuming that every formula can be demolded after the same number of hours. Production trials should establish a repeatable release window for the chosen materials and local climate.
Depending on the line design, demolding may use a mechanical clamp, hoist, or gantry arrangement. The equipment should support the mold safely and avoid damaging the green body.
The handling method also affects the required aisle width, lifting height, operator access, and mold-return route.
A wire-cutting machine can be selected according to the block geometry, target dimensions, green-body strength, and required production rate. Rotary-table and vertical-cutting configurations may suit different layouts and handling sequences.
Do not treat ±1 mm cutting tolerance as a guaranteed result for every NAAC mixture. Achievable dimensions depend on the machine, wire condition, cutting method, green-body stability, and measurement procedure. Ask the supplier to state the guaranteed tolerance and the conditions under which it applies.
The site must accommodate more than the main machines. Raw material storage, mixing, pouring, pre-curing, cutting, curing, finished-product storage, and vehicle access all compete for space.
Hengde's production line overview lists small-capacity block production configurations and indicates that space requirements can vary with output and layout. Treat a preliminary area estimate as a planning reference, not a final factory design.
| Site requirement | What to plan for | Why it matters |
| Production area | Batching, mixing, pouring, demolding, and cutting | Keeps material movement organized |
| Pre-curing space | Enough positions for molds waiting to reach handling strength | Prevents the pouring stage from being blocked |
| Curing and storage | Space for blocks during strength development and finished-product storage | Avoids premature dispatch and congestion |
| Raw material storage | Dry, accessible storage with suitable protection | Helps maintain material quality and reliable feeding |
| Electrical supply | Verified connected load, starting currents, and auxiliary equipment | Prevents undersized electrical infrastructure |
| Water supply and drainage | Water for production, cleaning, and any required curing process | Supports consistent mixing and orderly housekeeping |
| Handling routes | Forklift or trolley aisles and safe lifting access | Reduces handling time and product damage |
A 30 m³/day line may fit into a compact site, but the actual area depends on how long blocks remain in curing, how much inventory must be stored, and whether the facility operates one or multiple shifts. Finished-product inventory can require more space than the machinery itself.
Similarly, do not finalize an electrical capacity such as 25–30 kW until the selected equipment list is available. The mixer, air compressor, cutting system, conveyors, pumps, and auxiliary devices all contribute to the actual load.
A quoted capacity should be checked against the proposed production cycle and confirmed through commissioning. The important question is whether the complete line can consistently deliver the required volume of acceptable blocks, not merely whether an individual machine can process one batch quickly.
For a plant targeting 30 m³ over an eight-hour production shift, the average finished output must be 3.75 m³ per hour. This is a planning calculation and does not account for downtime, rejected blocks, or differences between poured and finished volume.
The supplier should explain whether the quoted daily capacity refers to poured slurry, green-body volume, or saleable finished blocks.
During commissioning, record:
Number of batches mixed and poured per shift.
Actual volume per batch.
Time spent on mixing, pouring, mold release, cutting, and handling.
Mold occupancy and turnover time.
Reject rate and dimensional consistency.
Finished output after the specified curing period.
If the line reaches 30 m³ of poured material but a significant proportion of blocks are rejected, its saleable output will be lower than the nominal capacity.
Evaluate the blocks against the relevant local standards and intended application. Depending on the product specification, testing may include dry density, compressive strength, dimensional tolerances, drying shrinkage, and water absorption.
NAAC blocks do not automatically achieve the same performance as autoclaved AAC blocks. Their properties depend on the formulation, pore structure, curing regime, and manufacturing controls. Confirm the required performance through appropriate testing rather than assuming that similar appearance means equivalent properties.
| Mistake | Potential consequence | Better approach |
| Selecting a mixer only by motor power | Inadequate batch volume or slow production cycles | Confirm effective capacity and complete batch time |
| Buying too few molds | Pouring stops while existing molds are occupied | Calculate mold demand from occupancy and turnover |
| Using an unverified foam dilution ratio | Unstable foam and inconsistent block density | Follow chemical supplier guidance and conduct trials |
| Underestimating curing space | Finished products and green bodies obstruct production | Plan for curing inventory and dispatch frequency |
| Assuming a fixed power requirement | Electrical system may be undersized | Verify the complete equipment list and starting loads |
| Treating quoted capacity as saleable output | Actual deliveries fall below target | Define capacity basis and measure accepted finished volume |
| Skipping product testing | Blocks may not meet local application requirements | Establish a quality-control plan before commercial production |
No. A non-autoclaved line does not use high-pressure steam autoclave curing. It still needs an appropriate curing process and sufficient time for the blocks to develop the required properties.
Yes, depending on the production layout, mold weight, block dimensions, labor availability, and safety requirements. Manual handling may reduce initial automation costs, but excessive handling can create bottlenecks and increase the risk of damaging green blocks.
The number depends on automation, material feeding, mold handling, cutting, curing, packaging, and shift length. Ask the supplier for a staffing estimate that identifies each task and clarifies whether the estimate includes material handling and finished-product movement.
Potentially, yes. Mold dimensions and cutting arrangements can often be adapted to different product specifications. Confirm the available size range, changeover requirements, and achievable tolerances before ordering.
Prepare your target daily output, raw materials, required block dimensions, target density and strength, available factory area, local power supply, preferred automation level, and project location. These details help Hengde propose a configuration that fits the actual production plan.
A reliable 30 m³/day NAAC production line requires balanced equipment selection, sufficient mold turnover, controlled foam preparation, accurate cutting, and a curing area sized for the planned output. Evaluating the complete production cycle and verifying saleable capacity can help prevent avoidable bottlenecks after installation.
Contact Hengde at hengdegz@gmail.com to discuss your NAAC block production project. Share your required daily output, block size, raw materials, factory layout, and local product standards to receive a configuration tailored to your manufacturing needs.
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