How to Improve AAC Block Surface Smoothness Using AAC Block Making Machine
The surface quality of autoclaved aerated concrete blocks directly affects subsequent wall plastering, adhesion performance and customer acceptance. Many AAC production plant operators focus only on output capacity, while ignoring small details that cause pits, cracks, uneven edges and rough surfaces on finished blocks. Proper adjustment and maintenance of the AAC block making machine can effectively solve most surface quality issues.
Check the Cutting Unit of AAC Block Making Machine
The cutting system is the core part that shapes block surface. Wire saws and horizontal cutting blades determine the flatness of aerated concrete blocks.
- Regularly inspect cutting wires for wear, deformation and slack. Loose wires will create wavy marks on block surfaces. Replace aging cutting wires on schedule.
- Keep the cutting frame stable during operation. Vibration from loose brackets leads to jagged edges. Tighten all connecting bolts before each batch production.
- Control the cutting speed matching the green cake hardness. Too fast cutting tears the green body; too slow cutting causes material sticking on blades.
Optimize Slurry Mixing and Pouring Process
Poor slurry uniformity is another major reason for uneven block surfaces, which is closely linked with the batching and mixing section of the AAC block making machine. Raw materials including fly ash or sand, lime, cement, aluminium powder need accurate proportioning. Inconsistent mixing will cause uneven pore distribution inside the green cake. When pouring, maintain steady flow speed to avoid air entrapment inside the mixture. Trapped air forms hollow pits on block surfaces after autoclaving.
Maintain Mould and Green Cake Handling System
Mould condition directly touches the outer surface of AAC green cake. Clean the mould box thoroughly after every pouring cycle. Residual hardened aerated concrete scraps left on mould walls will indent the next batch of blocks. Apply release agent evenly with proper thickness. Too much release agent causes surface powdering, while insufficient release agent leads to sticking and surface peeling during demoulding.
During demoulding and transport, avoid impact and extrusion on green cake. The green body before autoclaving is fragile. Gentle transfer by the handling equipment of AAC block making machine protects block edges and flat surfaces.
Autoclave Process Matching for Better Surface Performance
Although the autoclave is a separate unit, it works as part of the full AAC block making machine line. Stable temperature and pressure rise inside the autoclave prevent volume expansion difference. Uneven heating may generate micro cracks on block surfaces. Follow the recommended heating, constant temperature and cooling curve according to local raw material characteristics.
Daily Operation Suggestions for Operators
- Record surface defect data every working shift, trace problems back to cutting, mixing or mould sections.
- Do routine inspection and lubrication for moving parts of the AAC block making machine to reduce equipment vibration.
- Train operators to judge green cake hardness and adjust machine parameters timely instead of running fixed parameters all year round.
High-quality AAC blocks with smooth surfaces bring higher market competitiveness. Investing time in fine-tuning your AAC block making machine and standardizing operation workflows helps manufacturers reduce waste rate and produce premium lightweight building blocks for residential and commercial construction.
If you plan to upgrade your existing AAC production line, we provide customized machine solutions to help you optimize finished block surface quality and stable production capacity.