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400T FRP Manhole Covers Press press view 1
FRP Manhole Covers · Hydraulic Press Machine

400 Ton Four Column Hydraulic Press for FRP Manhole Covers

400T Rated Capacity
100 mm/s Slider Down Speed
5–11 mm/s Slider Pressing Speed
100 mm/s Slider Return Speed
400T FRP Manhole Covers Press press view 1
400T FRP Manhole Covers Press press view 2
400T FRP Manhole Covers Press press view 3
400T FRP Manhole Covers Press press view 4

01 — Press System

400 Ton Four Column Hydraulic Press Machine

This system produces high strength, corrosion free, and anti theft FRP manhole covers with heavy load bearing capabilities. It achieves fast, sustainable, and cost effective manufacturing using an integrated cooling system for rapid cycle times.

Use Case

The 400 ton four pillar press performs precision compression molding of FRP composite manhole covers and frames across various load classes. It delivers high compressive strength, impact resistance, anti slip safety, and weather durability for demanding municipal infrastructure applications.

  • Core Applications: Precision compression molding of heavy duty road drainage covers, sewer systems, stormwater chambers, telecom utility access units, and industrial drainage infrastructure.
  • Material: Glass fiber reinforced unsaturated polyester or vinyl ester thermoset resin blended with calcium carbonate, alumina trihydrate, UV stabilizers, anti corrosion agents, anti slip additives, and pigments.
  • Products Processed: Heavy load road manhole covers, sewer inspection frames, utility chamber lids, stormwater trench grates, and municipal composite access covers.
  • Why 400 Ton Hydraulic Press: Delivers exact pressure, temperature, and curing time control at closing speeds up to 200 mm per Sec, ensuring uniform fiber consolidation, thick section ribbed molding, and high volume output exceeding 15 units per Hour.

02 — Technical Specifications

SM 400 HP – HYDRAULIC PRESS MACHINE COMPLETE TECHNICAL DATA

SM 400 HP – Hydraulic Press Machine delivers precise and efficient composite molding for FRP manhole covers and rings with complete technical reliability. It ensures high strength, uniform curing, and consistent quality for heavy-duty infrastructure applications.

Capacity & Structural Design

  • Rated Capacity: 400 Tons (≈ 3920 kN)
  • Type: Fourpillar hydraulic hot press
  • Frame: Heavy welded steel, stress-relieved
  • Safety factor: ≥ 1.35
  • Deflection @ full load: ≤ 0.06–0.08 mm

Hydraulic System

  • Cylinder: Doubleacting heavy-duty
  • Bore: 350–450 mm
  • Stroke: 500–900 mm
  • Working pressure: 28–32 MPa
  • Control: Proportional / servo hydraulic system (recommended)

Compression Cycle

  1. Fast mold closing
  2. Pre-compression (material distribution)
  3. Full compression (forming stage)
  4. Heat curing (thermoset polymerization)
  5. Dwell time (3–6 minutes typical)
  6. Controlled decompression
  7. Mold opening

Heated Platen System

  • Heating type: Thermal oil system (preferred)
  • Temperature range: 130–170°C
  • Uniformity: ±2–3°C
  • Multi-zone heating control

Working Envelope

  • Platen size:
    • Standard: 1200 × 1200 mm
    • Optional: 1500 × 1500 mm
  • Daylight: 1200–1800 mm
  • Column diameter: 140–180 mm

Control System

  • PLC (Siemens / Mitsubishi / Delta)
  • HMI with recipe-based control
  • Real-time monitoring:
    • Pressure
    • Temperature
    • Time
  • Batch data logging (QA traceability)
  • Safety PLC with interlocks

SM 400 HP — Model Specifications

  • Nominal Force: 4000 KN
  • Maximum Hydraulic Pressure: 25 MPa
  • Max Opening Height of the Slider: 1250 mm
  • Max Stroke of the Slider: 800 mm
  • Effective Bed Size: 1260 × 1160 mm
  • Slider Down Speed: 100 mm/s
  • Slider Pressing Speed: 5–11 mm/s
  • Slider Return Speed: 100 mm/s
  • Ejector Cylinder Nominal Force: 400 KN
  • Stroke of the Ejection Cylinder: 300 mm
Production Case Study

FRP Manhole Covers & Rims Production Line

FRP / SMC / BMCRaw Material
300 x 300 mm to 900 x 900 mmManhole Size
180 to 360 SecCycle time
140–160°CTemperature
Heavy load class A15 to D400
Non metallic anti theft construction
High corrosion chemical resistance
Superior anti slip surface pattern
Rapid cycle integrated cooling
Exceptional impact load strength
High volume cost effective production

03 — Die / Mold System

Precision FRP Manhole Cover Die Mold Engineering

Precision FRP Manhole Cover Die Mold Engineering ensures accurate shaping, uniform thickness, and strong load-bearing structure. It delivers consistent quality, high durability, and reliable performance for heavy-duty infrastructure applications.

Technical Specifications

Mold Type

  • Heavy-duty compression mold
  • Thermoset heated mold

Mold Materials

  • Tool steel: H13 / P20 / CrMo alloy
  • Hardness: 48–55 HRC
  • Optional coatings:
    • Chrome plating
    • Anti-stick coating

Mold Construction

  • Upper mold: Surface pattern (logo / anti-slip design)
  • Lower cavity: Rib structure (load-bearing)
  • Guide pillars: Alignment accuracy ±0.02 mm
  • Ejection system: Hydraulic ejector pins

Heating System

  • Thermal oil heating channels
  • Multi-zone control
  • Uniform heat distribution

Venting & Degassing

  • Resin gas escape grooves
  • Air vents

Prevents:

  • Air pockets
  • Blisters
  • Structural voids

Surface Finish

AreaFinish
Top surfaceAnti-slip textured
Bottom surfaceRibbed (structural)
BrandingEmbossed logo/text

Mold Life: 200,000 – 500,000 cycles

Case Study (Die Performance)

Precision FRP Manhole Cover Die Mold

P20 / H13 AlloyDia Steel
48 to 52 HRCHardness
Vacuum HardeningHeat Treatment
Heavy load wear resistance
High precision core alignment
Optimal thermal heat distribution
Superior anti slip texturing
Extended mold service life
Flawless zero flash control
Corrosion resistant surface finish

04 — Product Application

Where FRP Composite Manhole Covers Are Used

FRP composite manhole covers are widely used in roads, urban infrastructure, drainage systems, and utility networks for secure and durable access points. They offer high load-bearing capacity, corrosion resistance, and long-term performance in demanding environments.

Industry Applications

Road & Urban Infrastructure

In road & urban infrastructure, FRP composite manhole covers are used in road manholes, drainage systems, and sewer access points. They provide high strength, corrosion resistance, and long-lasting performance in heavy-traffic environments.

Utility & Telecom

In utility & telecom sectors, FRP composite manhole covers are used for electrical cable chambers, telecom access covers, and gas pipeline inspection points. They offer secure, corrosion-resistant, and durable solutions for critical underground infrastructure.

Industrial Applications

In industrial applications, FRP composite manhole covers are used for chemical plant drainage, factory inspection points, and corrosion-prone environments. They provide excellent chemical resistance, durability, and reliable performance in harsh industrial conditions.

Smart Cities & Sustainable Infrastructure

In smart cities & sustainable infrastructure, FRP composite manhole covers are used as anti-theft solutions and eco-friendly alternatives. They offer durable, corrosion-resistant performance while supporting sustainable urban development.

IndustryScenario
Municipal Sewer manhole covers
Road Infrastructure Traffic load covers
Utilities Telecom & electrical chambers
Industrial Chemical-resistant covers
Smart Cities Modern composite infrastructure

Finished Product Gallery

400T FRP Manhole Covers Press finished product 1
400T FRP Manhole Covers Press finished product 2
400T FRP Manhole Covers Press finished product 3
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05 — Key Advantages

Why Choose the 400-Ton Sinter Hydraulic Press

It ensures uniform compression and precise curing for high-strength, load-bearing FRP covers. Designed for infrastructure use, it delivers consistent quality, durability, and long service life in demanding environments.

01

Thick-section molding capability

Enables efficient molding of thick and robust FRP sections with uniform compression. It ensures high structural strength and durability for heavy-duty manhole cover applications.

02

High load-bearing capacity (A15–D400)

Produces FRP manhole covers with excellent strength across A15 to D400 load classes. It ensures reliable performance in light to heavy-duty infrastructure applications.

03

Anti-theft (no scrap value)

FRP composite manhole covers have no resale scrap value, reducing theft risk significantly. They ensure secure, long-term installation in public and industrial infrastructure.

04

Corrosion resistant

Produces FRP manhole covers with excellent resistance to rust, chemicals, and environmental exposure. It ensures long-lasting durability and minimal maintenance in demanding conditions.

05

Lightweight vs cast iron

FRP manhole covers are significantly lighter than cast iron, making handling and installation easier. They reduce transport costs while maintaining high strength and durability.

06

Replacement for cast iron products

FRP manhole covers offer a lightweight, corrosion-free alternative to traditional cast iron. They ensure easier handling, lower maintenance, and long-lasting performance in infrastructure applications.

Get In Touch

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Production Line?

Our engineering team will size the press, die system, and automation to your target output, tile profile, and material spec. Quotations typically within 48 hours.

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