Stationary Platen: Weight 200-5000kg depending on size

Q: What is the difference between stationary and moving platens?

The stationary platen remains fixed to the machine frame and holds the stationary mold half, while the moving platen travels along tie-bars to open/close the mold and applies clamping force.

Q: How often should stationary platens be inspected?

Visual inspections should occur daily, dimensional checks monthly, and comprehensive structural assessments annually or every 10,000 operating hours.

Q: Can stationary platens be repaired if damaged?

Minor surface damage can be machined flat, but structural cracks or significant deformation typically require replacement due to safety concerns.

Component Specifications

Definition

The stationary platen is a critical structural component in injection molding machines' clamping units, designed to securely mount and support the stationary half of the mold. It remains fixed in position while the moving platen applies clamping force, ensuring precise mold alignment and uniform pressure distribution during injection cycles. Engineered for high rigidity and minimal deflection under extreme tonnage forces, it typically incorporates standardized mounting patterns, tie-bar connections, and cooling channels for thermal management.

Working Principle

The stationary platen provides a rigid, fixed reference point for mold mounting. During clamping operations, hydraulic or mechanical systems drive the moving platen toward the stationary platen, compressing the mold halves together with precise force (measured in tons). The stationary platen absorbs this clamping force through its connection to the machine frame and tie-bars, maintaining dimensional stability to prevent mold flash and ensure part quality. Its fixed position allows for consistent mold alignment and facilitates automated mold changing systems.

Materials

High-strength cast steel (ASTM A27/A148 grades), forged steel (AISI 4140/4340), or ductile iron with tensile strength 500-800 MPa, yield strength 350-600 MPa, hardness 200-300 HB. Heat-treated for stress relief and enhanced fatigue resistance. Surface treatments may include nitriding or chrome plating for wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	200-5000kg depending on size
Platen Size	Standard dimensions: 400x400mm to 2000x2000mm
Tie Bar Spacing	Center distances: 300-1800mm
Cooling Channels	Integrated for thermal control
Mounting Pattern	Standardized T-slots or threaded holes (ISO, JIS patterns)
Surface Flatness	≤0.02mm/m²
Deflection Tolerance	<0.1mm under maximum load
Clamping Force Capacity	50-5000 tons

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 12165, DIN 24482, JIS B 6702

Parent Products

This component is used in the following industrial products

Clamping Unit

A mechanical assembly in silicone molding machines that securely closes and holds the mold halves together under high pressure during the injection and curing phases.

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Engineering Analysis

Risks & Mitigation

Fatigue cracking under cyclic loading
Thermal distortion from uneven heating
Wear at tie-bar connection points
Corrosion in humid environments
Improper mold mounting causing stress concentrations

FMEA Triads

Trigger: Cyclic loading exceeding fatigue limits
Failure: Crack propagation leading to catastrophic fracture
Mitigation: Regular non-destructive testing (ultrasonic/magnetic particle), proper load distribution, material upgrades

Trigger: Thermal expansion mismatch with mold
Failure: Platen warping causing mold misalignment
Mitigation: Integrated cooling channels, thermal monitoring, controlled heating cycles

Trigger: Improper mold mounting procedures
Failure: Localized stress concentrations and premature wear
Mitigation: Standardized mounting protocols, torque-controlled fasteners, alignment verification

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Flatness: ±0.02mm/m², Parallelism: ±0.05mm relative to moving platen, Positional accuracy: ±0.1mm for mounting features

Test Method

Laser alignment verification, dial indicator measurements, ultrasonic thickness testing, finite element analysis validation

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Stationary Platen

Manufacturer profiles associated with Stationary Platen.

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Frequently Asked Questions

What is the difference between stationary and moving platens?