Editorial Technical Reference

Float Glass Annealing Lehr Roller

This page explains how Float Glass Annealing Lehr Roller is classified within Manufacture of Glass and Glass Products. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision ceramic roller used to transport and support glass sheets through the annealing lehr.

View Full Specifications Explore Manufacturing Sources
Float Glass Annealing Lehr Roller in a manufacturing environment
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Float Glass Annealing Lehr Roller

Definition
The Float Glass Annealing Lehr Roller is a critical component within the glass manufacturing line, specifically in the annealing lehr section. Its primary function is to convey flat glass sheets at a controlled, uniform speed through the annealing zone, where internal stresses are relieved to prevent breakage. These rollers must withstand continuous high temperatures (up to 600°C) and maintain dimensional stability to prevent glass surface defects like roller wave distortion. They are essential for ensuring the production of flat, stress-free, and high-quality architectural or automotive glass. The rollers are typically made from advanced ceramics such as Silicon Carbide (SiC) or Fused Silica, chosen for their thermal resistance and mechanical strength. Key parameters include roller diameter (50–150 mm), length (2000–4000 mm), maximum operating temperature (600–700°C), surface roughness (Ra 0.8–1.6 μm), static load capacity (500–2000 kg), rotational speed (0.5–5 rpm), and material grade (Al2O3 ≥ 99% per GB/T 5593). Tolerances for straightness and cylindricity are ≤0.1 mm/m and ≤0.05 mm, respectively, per ISO 1101. Thermal shock resistance is ΔT ≥ 200°C, hardness is ≥9 Mohs, and weight per roller ranges from 50–200 kg. These values are reference ranges and must be verified with the manufacturer for specific applications. The rollers are designed to operate in harsh environments, requiring regular inspection for wear and thermal fatigue. Proper alignment and maintenance are crucial to avoid glass defects and ensure consistent performance.
Working Principle
The roller rotates on its axis via an external drive system, supporting the bottom surface of the glass sheet. As the glass travels along the conveyor formed by multiple parallel rollers, it is gradually cooled in a controlled thermal profile to anneal the glass. The rollers must maintain precise dimensional stability and surface finish to prevent marking or distortion of the glass. The drive system ensures synchronized rotation to keep the glass moving at a uniform speed, while the roller's material and design allow it to withstand high temperatures and thermal cycling without deformation.
Common Materials
Silicon Carbide (SiC) Ceramic, Fused Silica Ceramic
Technical Parameters
ParameterTypical rangeNotes & selection driver
Roller DiameterRequired50–150 mmOuter diameter of the roller, critical for glass support and line speed.
Roller LengthRequired2000–4000 mmUsable length of the cylindrical rolling surface.
Maximum Operating TemperatureRequired600–700 °CMaximum continuous service temperature.
Surface Roughness (Ra)Required0.8–1.6 μmAverage surface roughness to minimize glass marking.
Static Load CapacityRequired500–2000 kgMaximum distributed load the roller can support without deflection.
Rotational Speed0.5–5 rpmMaximum safe rotational speed.
Material GradeAl2O3 ≥ 99%High purity aluminaGB/T 5593
Straightness Tolerance≤0.1 mm/mEnsures uniform glass supportISO 1101
Cylindricity Tolerance≤0.05 mmPrevents glass markingISO 1101
Thermal Shock ResistanceΔT ≥ 200 °CNo cracking under rapid temp changes
Hardness (Mohs)≥9Abrasion resistant
Weight per Roller50–200 kgDepends on size

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

Components / BOM
  • Ceramic Roller Body Part
    Provides the primary cylindrical surface for glass contact and transport.
    Material: Silicon Carbide or Fused Silica Ceramic
  • Metal Shaft Part
    Central axle for mounting, rotation, and torque transmission.
    Material: Heat-Resistant Alloy Steel
  • End Bearing Assembly
    Allows low-friction rotation of the roller on its shaft.
    Material: High-Temperature Bearings & Housing
  • Thermal Expansion Sleeve Optional
    Compensates for differential thermal expansion between ceramic body and metal shaft.
    Material: Graphite or Special Alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Float Glass Annealing Lehr Roller.

annealing lehr roller glass lehr roller ceramic conveyor roller

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Max 0.5 MPa (5 bar) distributed load, 1.0 MPa point load
other spec: Max linear speed: 15 m/min, Roller deflection: <0.1 mm/m, Surface roughness: Ra 0.4-0.8 μm
temperature: Ambient to 700°C (continuous operation), peak 750°C (short-term)
Media Compatibility
✓ Soda-lime float glass ✓ Borosilicate glass sheets ✓ Alkali-free glass substrates
Unsuitable: Molten glass or high-viscosity glass above softening point
Sizing Data Required
  • Glass sheet dimensions (width, thickness, length)
  • Required throughput (tons/hour or sheets/hour)
  • Annealing lehr temperature profile (ramp rates, dwell times)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Cyclic thermal stress from temperature variations in the annealing lehr (typically 600°C to 200°C), combined with mechanical loading from glass weight, leading to crack initiation and propagation in roller surfaces or bearings.
Bearing seizure or excessive wear
Cause: High-temperature operation degrading lubricants, ingress of glass dust or contaminants, misalignment causing uneven load distribution, or inadequate cooling leading to thermal expansion and loss of clearance.
Maintenance Indicators
  • Audible grinding or squealing noises from roller bearings during operation, indicating lubrication failure or bearing damage.
  • Visual observation of glass marking or scratching on the product surface, suggesting roller surface degradation, uneven wear, or misalignment.
Engineering Tips
  • Implement a predictive maintenance program using infrared thermography to monitor roller surface temperatures and detect hot spots indicative of bearing issues or uneven thermal loading.
  • Establish a strict alignment and balancing protocol during installation and after maintenance, using laser alignment tools to ensure parallel roller positioning and prevent uneven wear and excessive mechanical stress.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM C1036-21 - Standard Specification for Flat Glass DIN EN 572-1:2016 - Glass in building - Basic soda lime silicate glass products

Quoted from the published standard.

Manufacturing Precision
  • Roller Diameter Tolerance: +/-0.05mm
  • Roller Surface Flatness: 0.1mm per meter length
Quality Inspection
  • Dimensional Accuracy Verification using CMM
  • Surface Hardness Testing (Rockwell C scale)

Manufacturers of Float Glass Annealing Lehr Roller

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Qingdao Hexin Machinery Co.,Ltd.
Qingdao, Shandong, CN
Also makes: Heat Treatment Furnace, Texture Roller
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Annealing Lehr Rollers”
View source page ↗ hexinmachinery.com · checked 2026-09-10
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Share this page

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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.

Frequently Asked Questions

What materials are used for these rollers?

The rollers are typically made from Silicon Carbide (SiC) or Fused Silica ceramics, as listed in the product data. These materials provide high temperature resistance and dimensional stability.

What is the maximum operating temperature?

The maximum continuous operating temperature is 600–700°C, as specified in the product parameters. Always verify the exact limit with the manufacturer for your specific model.

How do I ensure the roller meets my requirements?

Check the listed parameters such as diameter, length, load capacity, and tolerances against your application needs. Confirm with the supplier that the roller complies with relevant standards like ISO 1101 for tolerances.

What maintenance is required?

Regular inspection for surface wear, thermal cracks, and alignment is recommended. Follow the manufacturer's guidelines for cleaning and replacement intervals to maintain performance.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
Buyer enquiry

Request manufacturing insight for Float Glass Annealing Lehr Roller

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim
A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at [email protected].

Need to Manufacture Float Glass Annealing Lehr Roller?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Get QuotesChat