HUARONG NRH TWO-PLATEN MOLDING SOLUTIONS
Two-Platen Injection Molding Solutions for Large Plastic Parts
Large molds need more than just higher clamping tonnage
From mold size and weight, opening stroke and floor space to mold loading and long-run stability, the NRH two-platen platform helps large-part projects find the right machine configuration.
Compact Footprint
A compact two-platen structure improves layout flexibility for mid-to-large machines.
Extended Mold Opening
Long opening strokes for deep-cavity molds and large-part removal.
Flexible Mold Loading
Optional tie-bar pullout eases loading and lifting constraints for large molds.
Stable Direct Clamping
Four direct-pressure clamping cylinders build a stable base for large-mold production.
Is your large-part project facing these constraints?
When machine selection is shaped by several of these conditions at once, a two-platen platform is worth evaluating.
- Large molds are limiting machine and plant layout options
- Deep parts or molds require a longer opening stroke
- Heavier molds demand more from platen support and clamping stability
- Crane or ceiling height restricts overhead loading of large molds
- Mold size or opening needs are forcing you into a larger machine
If these conditions are shaping your selection, a two-platen machine is worth evaluating — judged together with clamping tonnage, mold space, opening stroke, mold weight, shot size and output targets.
Automotive Applications
Two-platen molding for large automotive parts
Application illustration
CASE 01
Large Automotive Part Applications
Two-platen machines suit large automotive parts that need big molds, long opening strokes, multiple core-pull interfaces and robot access. The featured HUARONG case focuses on bumper-related parts, front grilles, large lighting components and other exterior parts, showing how two-platen machines are selected for automotive programs.
- Application
- Large automotive plastic parts
- Case Focus
- Bumper-related parts, front grilles, large lighting components
Video: auto parts and food containers molding, filmed on a customer production floor (official HUARONG channel)
CASE 02
Customer Production Footage
Filmed on customer production floors: HUARONG machines in mass production, molding automotive parts and food containers.
Video Highlights
- 00:30NRH two-platen | Automotive storage-box parts
- 00:42NRH two-platen | Subway food containers
- 01:01NRH two-platen | Automotive interior pedal
- 01:17HRN toggle machine | Automotive mudguard
Do large molds always have to be loaded from above?
What engineering keeps large molds stable?
For heavy molds, how the tie bars are supported and how the moving platen slides and aligns directly affect long-term stability and wear. These patented NRH mechanisms address those needs.
Suspended Tie-Bar Bearing Module
Reduces natural tie-bar sag and friction, providing the support needed for high-load operation.
Inner Supporting Sliding Module
Supports and guides smooth platen movement, maintaining rigidity under large molds; externally adjustable for easier maintenance.
Platen Positioning Device
Helps with coaxial platen alignment and assembly, supporting assembly accuracy and long-term operating stability.
Why does tie-bar support matter under large molds?
HUARONG Suspended Tie-Bar Bearing Module
Clamping deviation improved by approx. 91%
Internal test of the NRH850 suspended bearing support structure. Clamping deviation was reduced from 0.57 mm to 0.05 mm, an improvement of approximately 91%. This result reflects a specific model and test conditions and does not represent all applications.
Common Application Directions for Large Plastic Parts
From automotive exterior parts to logistics containers and household products, the two-platen platform supports many large-part applications. Common directions are shown below with real samples and illustrations.
Application illustration
Large Automotive Exterior and Structural Parts
Bumper-related parts, front grilles, large structural parts, interior and exterior trim
NRH-1050 actual application
Large Containers and Household Products
Laundry baskets, storage boxes, appliance housings, chairs and stools
HUARONG HR-2400LLN sample, shown as a large logistics-part reference; not an NRH production case.
Logistics and Industrial Handling Parts
Plastic pallets, logistics crates, waste and recycling containers
Illustrations and reference samples indicate part types only; actual machine selection still depends on part size, projected area, mold weight, opening stroke, shot size and output targets. You are welcome to discuss your project with our engineering team via the form below.
Why clamping design matters for large molds
As mold weight and projected area increase, how clamping force is built and how the platens take the load both affect long-run production stability.
Four direct-pressure clamping cylinders build clamping force directly and distribute it evenly across the mold, helping reduce uneven platen loading and mold wear.
Four synchronized double half-nuts work with the two-platen clamping sequence to build high clamping force quickly, helping reduce mold stress during continuous production.
The actual configuration still depends on the part, mold weight, projected area and molding conditions.
What else matters for long production runs?
Choosing a large machine is not only about whether it can mold the part — long-term structural load, maintainability and downtime risk matter too.
HUARONG uses 3D modeling and Nastran structural analysis to optimize high-load structures, and evaluates large-machine design against long-term operation and maintenance needs.
Peak improvements from structural analysis
Using Nastran computer-aided analysis to optimize the NRH structure, the peak improvement in front platen strength was +18% and in moving platen strength +12%.
These are peak values from structural analysis, not overall machine strength gains.
How can mold changes and maintenance stay manageable?
NRH keeps mold loading, changeover and maintenance flexible by design. For the optional tie-bar pullout, see Do large molds always have to be loaded from above? above.
Fast Fully-Automatic Mold-Height Adjustment
Automatic mold-height adjustment improves mold-adjustment efficiency by more than 50% compared with program-controlled adjustment, reducing mold changeover time.
Removable Safety Doors
Eases inspection and maintenance work on large machines, improving service accessibility.
Externally Adjustable Structure
The inner supporting sliding module can be adjusted from the outside, reducing the risk of entering the machine frame for service.
NRH maintenance design focuses on reducing downtime and personnel risk while improving the long-term availability of large equipment.
Two-platen or toggle — how do you decide?
No single clamping design fits every product. The differences lie mainly in how clamping force is built and in mechanism length, so each design suits different part sizes, mold conditions and plants.
| Comparison | Toggle machines | Two-platen machines |
|---|---|---|
| Clamping force | Toggle machinesForce is transmitted through a toggle linkage; mature high-speed performance on small and mid-size machines | Two-platen machinesFour direct-pressure clamping cylinders apply force directly |
| Machine length | Toggle machinesLonger mechanism, larger footprint at the same tonnage | Two-platen machinesMore compact — machine length reduced by approx. 20%* |
| Opening stroke | Toggle machinesLimited by toggle travel | Two-platen machinesLong opening strokes can be planned to suit the part and mold |
| Large-mold loading | Toggle machinesLarge molds may be limited by crane height | Two-platen machinesOptional tie-bar pullout improves mold loading flexibility |
| Maintenance | Toggle machinesMore linkage parts and a more complex adjustment procedure | Two-platen machinesExternally adjustable modules reduce the need to enter the frame |
*Machine length compared with conventional toggle machines; the actual reduction varies by model.
The choice depends on part size, mold weight, opening needs and plant conditions — it is not a question of one being better. Toggle machines remain well suited to small-to-mid, high-speed applications; as part size, mold weight and opening stroke grow, two-platen structures usually offer more space and mold flexibility.
Where else can energy use and productivity improve?
NRH uses a servo drive system as its energy baseline; the following options can be evaluated as production and management needs grow.
Servo Drive System
43 ms servo response time and up to 75% energy saving (actual savings vary by model and operating conditions).
Energy-Saving Direct-Drive Plasticizing System
With the optional direct-drive material storage system, internal data records up to 26% lower energy use during plasticizing.
HFM and 13-Parameter Process Monitoring
HFM and 13-parameter process monitoring can be evaluated to suit your production management needs.
Long-term support matters when buying large machines
40+ years of injection molding machine manufacturing
2024 Taiwan Excellence AwardNRH-850 Two-Platen Smart Injection Molding Machine2025 Taiwan Excellence AwardInnovative Energy-Efficient Injection Molding Technology
Horizontal, vertical, multi-shot and automation integration
Long-term support in practice: a Canadian plastics manufacturer has kept a large two-platen machine in stable production for about 15 years; after the brand integration, spare parts, technical support and automation upgrades continued without interruption.Read the case
Common questions on large parts and two-platen machines
When should a two-platen injection molding machine be evaluated?
When a large-part project is constrained by mold size and weight, opening stroke, floor space, mold loading or long-run production stability, a two-platen injection molding machine is worth including in the evaluation.
Is clamping tonnage enough to select a machine for large molds?
No. Selecting a large injection molding machine usually also requires confirming part size, projected area, mold size and weight, opening stroke, shot size and output targets.
How can large molds be loaded when ceiling height is limited?
If a mold cannot easily be lowered from above, tie-bar pullout can be evaluated to improve mold loading flexibility. On NRH machines tie-bar pullout is optional equipment; the actual configuration depends on the model, mold and plant conditions.
What information should I prepare before asking HUARONG for NRH selection advice?
We recommend preparing part dimensions, material, part weight, projected area, mold dimensions, mold weight, mold thickness, opening requirement, shot weight and the target cycle time or output.
Official Product Page
Looking for complete NRH product information?
See the official HUARONG product introduction for the NRH two-platen injection molding machine and related products.
Share your part and mold data to get NRH selection advice
Providing your part, mold, opening and injection requirements helps HUARONG engineers confirm the right NRH configuration faster.
- Product dimensions
- Material
- Product weight
- Projected area
- Mold dimensions
- Mold weight
- Mold thickness
- Opening requirement
- Shot weight
- Target cycle time
Get NRH Selection Advice
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