China Concrete Hollow Paver Blocks Moulds
2.Hardness for shoes:HRC59-62
3.Carburized layer thickness:1.3-1.5mm
4.Unilateral clearance between presser foot and mold cavity: 0.2 mm ≤ Unilateral clearance ≤ 0.4mm
5.Flatness of the whole board: ≤ 0.5mm
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Product Details ofChina Concrete Hollow Paver Blocks Moulds
China Concrete Hollow Paver Blocks Moulds
Solving the Economics of Multi-Product Block Manufacturing
The challenge for any block plant is straightforward: customers want a variety of hollow paver designs, but purchasing a complete mould for each design ties up capital and consumes warehouse space. Chinese manufacturers have addressed this problem through modular mould systems that separate the outer frame from the cavity inserts.
UNIK has been manufacturing concrete hollow paver blocks moulds in Quanzhou, Fujian since 2010, exporting to 28 countries. This page explains how Chinese mould manufacturers have restructured tooling costs and what buyers should look for when sourcing from China.
The Traditional Problem with Hollow Paver Moulds
Conventional moulds are single-purpose tools. A mould designed for a 200x100mm hollow paver cannot produce a 225x112.5mm paver. For block plants serving multiple customers or project types, this means purchasing a separate mould for every paver size and pattern. Each mould requires its own outer frame, cavity plates, and mounting hardware. The cost multiplies quickly. Storage space fills with heavy steel frames that spend most of their time idle.
Chinese manufacturers began addressing this inefficiency by developing insert mould systems.
How Insert Mould Systems Work
An insert mould system separates the mould into two components:
The outer frame – A permanent steel housing that mounts onto the block machine. This frame contains the mounting interface, alignment pins, and vibration transmission structure. One outer frame serves for the life of the machine.
The cavity inserts – Removable tool steel blocks that contain the actual paver cavity geometry. Inserts drop into the outer frame and lock into place. Changing paver designs requires only new inserts, not a new frame.
This separation changes the economics of hollow paver production. The outer frame is purchased once. Inserts are purchased as needed for each new paver design. When a paver style is discontinued, only the inserts are retired. The outer frame continues in service.
What Makes a Quality Hollow Paver Insert
The cavity insert determines paver quality. UNIK manufactures inserts from Cr12MoV or 9CrSi alloy tool steel. These grades provide the hardness needed to resist abrasion from concrete aggregates while maintaining toughness to absorb vibration.
Surface hardness: HRC59-62 after carburizing heat treatment. This is significantly harder than standard structural steel, providing wear resistance across hundreds of thousands of cycles.
Dimensional tolerance: ±0.3mm on cavity dimensions. Hollow pavers require consistent thickness on all walls. Variation beyond this range creates weak points or fitting problems.
Surface finish: Ra 1.6 or better. A smooth cavity surface allows pavers to release cleanly without sticking. Rough surfaces cause demolding delays and edge damage.
Corner radius: 3-5mm on all internal corners. Sharp corners concentrate vibration stress and crack. Radiused corners distribute stress and extend insert life.
Heat Treatment for Hollow Paver Inserts
The heat treatment process determines how long an insert maintains its precision. UNIK uses a sequence of vacuum quenching at 980°C followed by multiple tempering cycles at 580°C. This creates a hard surface layer of 1.3-1.5mm while maintaining core toughness. Optional deep-cryogenic treatment to -196°C converts retained austenite to martensite, extending service life by over 30%.
Buyers should confirm that their supplier provides heat treatment documentation, including hardness test reports and carburized layer depth measurements.
Machine Compatibility for Hollow Paver Moulds
UNIK moulds are designed to fit major block machine brands:
European: HESS, MASA, ZENITH, BESSER, Poyatos, Rometa, KVM
Asian: TIGER (Japan), Qunfeng, Hengxing, Quangong
Other: Columbia
For machines not listed, UNIK manufactures custom outer frames based on customer drawings or old moulds. The same insert sets work across compatible frame designs, allowing plants with multiple machine brands to share insert tooling.
UNIK's Hollow Paver Insert Specifications
UNIK manufactures hollow paver inserts to the following standards:
Steel grade: Cr12MoV or 9CrSi alloy tool steel
Heat treatment: Carburizing with vacuum quenching and multiple tempering
Surface hardness: HRC59-62
Core hardness: HRC35-40
Carburized layer: 1.3-1.5mm
Dimensional tolerance: ±0.3mm
Surface finish: Ra 1.6 or better
Corner radius: 3-5mm
Expected insert lifespan: 70,000-90,000 cycles
Expected frame lifespan: 200,000+ cycles
UNIK has exported to 28 countries since 2010, with documented deliveries including a complete wave-type paver production line to Sri Lanka (2025) and concrete equipment to Kenya (2026).
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Chinese concrete hollow paver blocks moulds have evolved from single-purpose tooling to modular insert systems that reduce capital investment by 40-60%. The outer frame is purchased once and lasts for over 200,000 cycles. Cavity inserts are purchased separately for each paver design and replaced only when worn. This approach allows block plants to offer multiple paver styles without multiplying tooling costs.
Quality indicators for Chinese moulds include certified steel grades (Cr12MoV or 9CrSi), carburizing heat treatment achieving HRC59-62 surface hardness, dimensional tolerance of ±0.3mm, and surface finish of Ra 1.6 or better. UNIK has manufactured these moulds in Quanzhou since 2010, exporting to 28 countries with documented deliveries to Sri Lanka (2025) and Kenya (2026).
For buyers, the key verification steps are: request material certificates, review heat treatment documentation, confirm dimensional inspection reports, and verify machine compatibility before ordering.
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