Hollow Block Making Machine Cost: Mould Count and Cycle Time
12 October 2026 · 6 min read
Quick answer
A hollow block machine is priced by three things before anything else: how many cavities the mould carries, how much pallet area the press closes in one cycle, and the vibration force it can push into the cores. Core bars are consumables, so a spare mould body and core bar set belong in the budget together with freight and duty.
A hollow block making machine cost is decided by three things before any quotation is written: how many cavities the mould carries, how much pallet area the machine presses in one cycle, and how much vibration force it can push into the cores. A hollow block is not a solid block with holes cut into it. The mix has to travel around core bars, fill two or more voids, and still hold a sharp edge when the mould strips. Each of those jobs changes the machine you need, the mould you wear out, and the cycle time that turns into shift output.
1. What changes when the block is hollow
Start with the block itself. A 390 x 190 x 190 mm hollow block carries two cores through the 190 mm body, so the mould needs a core bar set on top of its cavity. A solid block of the same footprint uses a plain cavity, compacted from one face. In the hollow mould the mix must slide past the core bars and knit the shells, the webs and the face together in one press cycle.
That single change drives the cost. The mould is no longer one piece of steel with a cavity: it is a cavity plus core bars that must be positioned, vented and worn evenly, plus a stripper that lifts the block off them without tearing the top edges. Core bars wear first, they are consumed, and their condition shows up in weight scatter from block to block.
2. Cavity count per mould sets the unit cost
The largest lever on unit cost is how many hollow blocks one press cycle produces. Our static hydraulic presses form the same block at three cavity counts. QS800 forms 5 blocks per mould on a 1,100 x 680 mm moulding area. QS1000 forms 10 blocks on 1,100 x 850 mm. QS1500 forms 12 blocks on 1,440 x 850 mm.
Read that as cost per block, not machine price. Doubling the cavity count spreads one press, one hydraulic system, one operator and one cycle over twice as many blocks. Moving from a 5 cavity mould to a 12 cavity mould cuts the press cycles needed for a given order by more than half.
The pallet grows with the cavity count, and it is a consumable: QS800 runs a 1,100 x 700 x 20 mm pallet, QS1000 a 1,200 x 900 x 20 mm pallet, QS1500 a 1,500 x 900 x 30 mm pallet. A thicker pallet lasts longer and costs more per piece, and it travels through a heavier machine: QS1500 single-direction draws 88.4 kW against 54.9 kW on QS800.
3. Vibration force: why a hollow block honeycombs first
Honeycombing is the failure mode a hollow block reaches before a solid block does. The mix must fill the space between two core bars that stand in the path of the flow, and the top of the block is furthest from the table vibrator. If force falls short of what the section needs, the cores stay surrounded by loose pockets of low density.
The vibration figures separate the models more clearly than block size does. QST8-15 delivers 95 kN of vibration force at 44.9 kW. QST1200 delivers 150 kN at 57.6 kW. QST1800 delivers 280 kN at 104 kW, close to three times the smallest force in the range, all at 31.5 MPa.
Weak compaction is not free either. Every 1% of trapped air left in the mix costs about 5% of compressive strength, and most plants add around 30 kg of cement per m3 to buy it back. A hollow mould running under force is fed more cement, and cement is the largest recurring cost line in the block.
4. Cycle time into shift output over eight hours
Cycle time is the second cost driver and the one buyers misread most often. QST8-15 and QST1500 run a 15 to 23 second cycle; QST1200 and QST1800 run 15 to 25 seconds. The nameplate output on the same machines is quoted for standard brick moulds: 90,000 standard bricks per 8 hour shift on QST8-15, 120,960 on QST1200, 220,000 on QST1800.
Work the hollow block case out yourself. A 15 second cycle gives 240 cycles per hour, so 1,920 cycles in an eight hour shift. A mould with 5 cavities then presses 9,600 blocks before any loss, and at the 70% to 80% of nameplate that plants accept, 6,720 to 7,680 blocks a shift are saleable. At 23 seconds the same shift lands near 4,380 to 5,000 blocks.
Ten seconds of cycle time is the difference between those numbers on the same machine, with the same mould. A supplier quoting blocks per hour without the cycle time and the cavity count has not given you a number you can cost.
5. Mould wear, core bars and the spare set to price now
Core bars are consumables on a hollow block machine and they wear from the inside out. Abrasion at the stripping face opens the clearance between bar and mould, mix creeps into the gap, and the block leaves with a rounded core or a torn top edge. The first sign is weight scatter inside one pallet load, not a visible defect.
Budget the mould and the core bars the way you budget pallets. Pallets stay the largest consumable item on any pallet-based line, and a mould set with core bars is the second one you cannot run without. Both are wear items with a replacement interval measured in cycles.
Spare capacity matters more on a hollow line than on a solid line, because without core bars you cannot make the block at all. One spare core bar set and one spare mould body keep the plant running through a wear replacement, and a plant on two shifts runs about 500 shifts a year. Ask for the core bar material and the expected cycles per set in writing.
6. The form that makes two quotes comparable
Two quotations for a hollow block machine can be compared only when both suppliers answered the same six lines. Write them down and send the same page to everyone.
Block type and size in millimetres, with the number of cores. Mould cavities per cycle. Pallet size and thickness, or whether the line is pallet-free. Forming cycle in seconds, stated for the block you actually sell. Shift output for that block at 70% to 80% of nameplate. Then voltage, frequency and destination port.
Cost belongs at the end. Equipment is 40% to 55% of what a plant costs to build, and freight, duty and inland transport commonly add 15% to 40% on top, so a price quoted without the destination says little about the investment. We quote hollow block machines to configuration; the published band for cement block machines runs from $30,000 to $300,000, and the gap between a small machine and a large one exceeds 100 times. Send the six lines and we answer on the same page.
Frequently asked questions
What does a hollow block making machine cost, and what moves the number most?
There is no single figure, because the machine is configured around your block. The three items that move it most are the number of cavities in the mould, the moulding area and pallet size, and the vibration force the machine can deliver. We quote to configuration, so send the block size, core count, pallet, voltage and destination port first.
Why does a hollow block cost more to produce than a solid block of the same size?
The mould carries a core bar set on top of its cavity, and those bars are consumables. Filling around them is harder, so the machine needs more vibration force, and a hollow mould produces fewer pieces per cycle than a solid mould of the same area. If the cores fill badly, 1% of trapped air costs about 5% of compressive strength.
How many hollow blocks can one machine make in an eight hour shift?
It follows from the cycle time and the cavity count. A 15 second cycle gives 1,920 cycles in eight hours; a mould with 5 cavities then presses 9,600 blocks, and 70% to 80% of that is 6,720 to 7,680 saleable blocks. At a 23 second cycle the same mould lands near 4,380 to 5,000. Published nameplate output is quoted for standard bricks.
Do I need to order a spare mould and core bar set with the machine?
Core bars wear out, and without them the line stops, so price one spare core bar set and one spare mould body into the project. Ask for the expected cycles per set in writing, not as a verbal promise. On a pallet-based line the pallets remain the largest consumable item, which makes the mould the second line of that budget rather than an accessory.
Which hollow block machine makes 12 blocks per mould?
QS1500 forms 12 hollow blocks of 390 x 190 x 190 mm per cycle on a 1,440 x 850 mm moulding area, with a 1,500 x 900 x 30 mm pallet. Single-direction it draws 88.4 kW on a 20 to 25 second cycle; the double-direction version runs 18 to 22 seconds at 108.2 kW. QS1000 forms 10 blocks on 1,100 x 850 mm.
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