Top 5 Common Problems in Brick Mould Production and How to Avoid Them
In the concrete and paving industry, brick moulds play a vital role in defining the accuracy, strength, and finish of every block produced. However, many manufacturers face quality issues and productivity losses due to improper mould usage or maintenance.
This article explains the five most common problems in brick mould production and provides practical solutions to help you improve mould life, reduce waste, and achieve consistent results.
1. Uneven Brick Dimensions
Problem:
Inconsistent brick sizes or uneven edges are usually caused by worn-out mould cavities, loose mould assembly, or poor vibration control.
Impact:
Leads to rejection in bulk orders, poor interlocking during installation, and increased material waste.
How to Avoid It:
Regularly check the mould cavity dimensions using precision gauges.
Tighten bolts and frames before each production cycle.
Use precision-engineered moulds from UNIK MOULD, designed with CNC machining to ensure consistent accuracy.
Maintain a stable vibration setting on the block making machine to prevent over-compaction or air pockets.
2. Cracks or Chips on Block Surface
Problem:
Cracked or chipped concrete blocks often result from poor demoulding techniques or uneven pressure during vibration.
Impact:
Affects product appearance and reduces structural strength - critical in decorative or load-bearing blocks.
How to Avoid It:
Apply mould release oil evenly before each cycle to ensure smooth demoulding.
Use rubber or PVC liners inside the mould to absorb vibration stress.
Avoid removing blocks too early; allow proper curing time (24–48 hours minimum).
Regularly clean residue or hardened cement from mould corners.
3. Early Mould Wear and Deformation
Problem:
Continuous use of low-quality steel or poor heat treatment can cause mould deformation, surface abrasion, or cavity distortion.
Impact:
Reduces mould lifespan, increases block dimensional error, and leads to frequent replacement costs.
How to Avoid It:
Choose moulds made from Q355 / 45# steel with heat-treated surfaces.
Store moulds in dry, shaded areas to prevent rust.
Rotate usage if multiple moulds are available to distribute wear evenly.
Select UNIK MOULD's precision steel moulds, which use reinforced welding and surface hardening technology for extended service life (over 100,000 cycles).
4. Poor Block Surface Finish
Problem:
Rough or uneven surfaces are caused by improper concrete mix ratios, weak vibration, or damaged mould surfaces.
Impact:
Affects visual quality, reduces paving performance, and causes poor client satisfaction.
How to Avoid It:
Maintain an ideal concrete mix (cement:sand:aggregate = 1:2:3).
Add plasticizers or fine sand to achieve a smoother texture.
Ensure the vibration table is level and strong enough for uniform compaction.
Polish or resurface worn mould cavities periodically.
💡 Tip: Rubber and PVC moulds are ideal for decorative paving blocks - they provide naturally smooth finishes and are easier to clean.
5. Difficult Demoulding or Sticking Concrete
Problem:
Blocks sticking to the mould or difficult demoulding operations are very common issues, especially when using plastic or steel moulds.
Impact:
Slows production speed, damages edges, and reduces mould lifespan.
How to Avoid It:
Use professional mould release oil (avoid diesel or dirty lubricants).
Clean the moulds after every production batch.
Use smooth cavity coatings such as Teflon spray or silicone layer.
Consider switching to rubber paving moulds, which offer natural elasticity for easy release.
Bonus Tip: Regular Maintenance Improves Profit
A small investment in proper mould care can extend service life by up to 40% and reduce defective products significantly.
UNIK recommends the following daily routine:
Clean and inspect all moulds after each shift.
Apply anti-rust oil during storage.
Record mould usage cycles for timely replacement.
Avoiding these five common problems in brick mould production will greatly improve your block quality, reduce operational downtime, and increase overall profitability.
Choosing a reliable supplier is also essential - high-precision moulds from UNIK MOULD are designed to minimize defects, extend lifespan, and ensure consistent output for every batch.
Looking for durable and precise concrete brick moulds for your factory?
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for factory-direct pricing, OEM customization, and complete block production solutions.
High precision. Long life. Consistent results - that's UNIK quality.