Mould box
Contains the poured mix during rising and initial setting.
AAC PLANT PROCESS ENGINEERING
Mould handling.
Engineered as a cycle.
A balanced AAC mould handling and precuring system connects pouring, initial setting, tilting, cutting and side-plate return—without treating each machine as an isolated purchase.
For new AAC plants, expansions and circulation retrofits.
DIRECT ANSWER
More than mould movement.
An AAC mould handling and precuring system moves filled moulds from pouring to controlled initial setting, then positions the green cake for demoulding and cutting.
Its engineering purpose is to keep moulds, side plates, transfer equipment and downstream machines circulating at the rate required by the production plan. If one part is undersized or poorly sequenced, it can restrict otherwise capable equipment.
THE CENTRAL ENGINEERING QUESTION
Is every mould ready when pouring needs it—and every side plate available when production needs it?
THE COMPLETE CYCLE
From empty mould
to cutting-ready cake.
The process is continuous. Each movement affects the next pour, the cutting line and the availability of production carriers downstream.
-
01
Prepare
Clean, inspect and apply release oil to the empty mould.
-
02
Pour
Position the mould and receive the prepared AAC mix.
-
03
Transfer
Move the filled mould into the designated precuring area.
-
04
Pre-cure
Allow the cake to rise and develop cutting-ready green strength.
-
05
Tilt
Position the mould and green cake for demoulding and cutting.
-
06
Separate cycles
Return the mould; continue the side plate with the cake.
SYSTEM SCOPE
One coordinated section.
Six critical interfaces.
Final equipment scope is project-specific. These elements must be selected together and checked against the plant layout and planned cycle.
Ferry cart
Transfers moulds across or between production tracks.
Precuring enclosure
Provides the holding space and controlled process environment.
Tilting station
Positions the green cake for demoulding and cutting.
Cleaning & oiling
Prepares each empty mould for its next production cycle.
Controls & interlocks
Coordinate movement, confirm positions and prevent conflicts.
PRECURING CONTROL
Time is a reference.
Readiness is the decision.
Precuring allows the poured material to rise and develop the green strength required for demoulding and wire cutting.
Industry references often describe approximately two to three hours. But actual cutting readiness depends on the raw-material source, recipe, slurry temperature, aluminium reaction, cake size and process conditions. It is not a universal fixed guarantee.
Controlled conditions, not an assumed setpoint
A closed or controlled enclosure may help where ambient variation affects production. The heating method, circulation, control point and operating range must be established during process engineering. Recoverable heat may be considered only through an engineered heat-exchange arrangement with the necessary steam-balance and safety review.
CYCLE-BASED EQUIPMENT SIZING
Calculate the circulation.
Do not guess the quantity.
Mould quantity must be derived from the production schedule, not selected as an independent purchase number.
CONCEPTUAL RELATIONSHIP
Active moulds ≈
Total mould-cycle time
÷
Planned pouring interval
THE KEY DISTINCTION
Mould cycle ≠
side-plate cycle.
The two items perform different functions and remain occupied for different lengths of time. Their quantities should therefore be calculated separately.
| Circulation item | Main stages | Primary quantity driver |
|---|---|---|
| Mould box | Pouring → precuring → tilting → cleaning/oiling → return | Mould-cycle time and pouring interval |
| Side plate | Cutting → handling → autoclave loading → autoclaving → unloading → return | Complete downstream and autoclave schedule |
The precise ratio is project-specific. It depends on the cutting route, autoclave arrangement, loading pattern, production shifts and side-plate return path.
AUTOMATE INTELLIGENTLY
Choose the control level.
Define what remains manual.
“Automatic” is meaningful only when movement, positioning, confirmation, interlocking and recovery functions are clearly described.
Manual
Operator-led movement where cycle demand and the risk assessment permit manual involvement.
Check labour dependency, ergonomics, safe movement and future capacity.Semi-automatic
Powered movement at selected points while some sequencing remains operator controlled.
Check remaining decisions, position confirmation and interface bottlenecks.Fully automatic
Interlinked drives, sensors and logic sequence mould movement between defined positions.
Check controls skill, fault recovery, sensor reliability and maintenance discipline.COMMON DESIGN ERRORS
What appears small
can restrict the whole line.
-
01
Selecting mould quantity only from daily capacity.
-
02
Assuming mould and side-plate quantities are equal.
-
03
Treating precuring as a fixed waiting time.
-
04
Motorising movement without sequencing and interlocks.
-
05
Ignoring expansion space in the original track layout.
-
06
Accepting poor rail and transfer-interface alignment.
ENGINEERING INPUTS
What we need
to review your cycle.
A useful technical discussion begins with a small set of project-specific inputs.
01
Plant status
New plant, expansion or retrofit
02
Target output
Net capacity and planned operating hours
03
Mould size
Dimensions and usable cake volume, if selected
04
Raw-material route
Fly ash, pond ash, sand or approved combination
05
Available layout
Track plan, dimensions and expansion area
06
Downstream cycle
Cutting route, autoclaves and loading sequence
PRACTICAL QUESTIONS
Before you finalise
the handling section.
01What is the purpose of precuring in an AAC plant?
Precuring allows the poured AAC mix to rise and develop sufficient green strength for the selected demoulding and wire-cutting process.
02How long does AAC precuring take?
Industry references often describe approximately two to three hours, but actual cutting readiness depends on raw materials, recipe, temperature, cake size and the plant's approved control method. It should not be treated as a universal fixed time.
03What temperature should a precuring room maintain?
There is no universal setpoint for every AAC plant. The operating range and measurement point should be established from the raw-material system, mix behaviour, enclosure design and validated production trials.
04How is the required number of moulds calculated?
The preliminary quantity is based on total mould-cycle time divided by the planned pouring interval, then checked against physical positions, operating allowance, maintenance and standby requirements.
05Why are more side plates than moulds often required?
The mould can return after demoulding, while the side plate may remain occupied through cutting, autoclaving and return. The two circulation quantities must therefore be calculated separately.
06Can an existing mould-handling system be upgraded?
A retrofit may be possible after reviewing track condition, layout, mould interfaces, production sequence, controls, civil constraints and the required capacity improvement.
PLAN THE COMPLETE CIRCULATION
Review the cycle
before fixing the equipment quantity.
Share your target capacity, mould size, planned operating hours and available layout. Receive a focused technical discussion covering moulds, side plates, ferry carts, precuring positions and the suitable automation approach.