Structured Manufacturing Data (2026)

Starwheel or Pocketed Disc

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Starwheel or Pocketed Disc used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Starwheel or Pocketed Disc is characterized by the integration of Pocket/Cavity and Mounting Hub. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel (e.g., 304, 316) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A rotating disc with precisely shaped pockets that receives, orients, and transfers bottles in an unscrambling system.

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Product Specifications

Technical details and manufacturing context for Starwheel or Pocketed Disc

Definition
The starwheel or pocketed disc is a critical component within a bottle unscrambler machine. It is a rotating disc machined with multiple pockets or cavities, each shaped to hold a single bottle in a specific orientation. As the disc rotates, it receives randomly oriented bottles from the infeed, aligns them into the correct upright position within its pockets, and transfers them in a controlled, singularized stream to the downstream conveyor or filling station.
Working Principle
The disc rotates at a controlled speed. Randomly oriented bottles are fed onto or near the disc. The pockets on the disc are designed to only accept bottles in the correct orientation (typically upright). Bottles falling into the pockets are carried by the disc's rotation. Incorrectly oriented bottles are rejected and recirculated. The rotation presents each pocket, now containing a correctly oriented bottle, to a discharge point where the bottle is released onto a conveyor.
Common Materials
Stainless Steel (e.g., 304, 316), Engineering Plastic (e.g., Acetal, UHMW-PE), Cast Aluminum
Technical Parameters
  • Outer Diameter (OD) and thickness of the disc. (mm) Customizable
Components / BOM
  • Pocket/Cavity Part
    Holds and orients a single bottle during transfer.
    Material: Matches main disc material (e.g., stainless steel)
  • Mounting Hub
    Central fixture for attaching the disc to the drive shaft.
    Material: Steel or Aluminum
  • Wear Liner/Insert (Optional) Part
    Replaceable lining inside pockets to reduce wear and noise.
    Material: UHMW-PE, Silicone, or other polymers

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Starwheel or Pocketed Disc.

Star Wheel Pocket Wheel Sorting Disc stainless steel bottle unscrambling starwheel pocketed disc for bottle orientation systems engineering plastic starwheel for packaging machinery custom pocketed disc with wear inserts precision bottle transfer starwheel for manufacturing

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Bottle Unscrambler
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (no pressure rating required for unscrambling)
other spec: Bottle diameter range: 10-150mm, Bottle height range: 30-400mm, Max rotational speed: 60 RPM
temperature: -10°C to 80°C (typical for food/pharma applications)
Media Compatibility
✓ PET bottles ✓ Glass containers ✓ HDPE pharmaceutical vials
Unsuitable: Highly viscous liquids or products requiring aseptic transfer (due to open pocket design)
Sizing Data Required
  • Bottle dimensions (diameter and height)
  • Production rate (bottles per minute)
  • Bottle material/weight

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wear-induced misalignment
Cause: Abrasive particles in the fluid causing progressive erosion of the starwheel teeth or pocket edges, leading to improper engagement and timing errors.
Fatigue cracking
Cause: Cyclic loading from repeated indexing or high-speed operation, often exacerbated by stress concentrations at sharp corners or material defects.
Maintenance Indicators
  • Audible clicking, grinding, or skipping sounds during operation indicating improper engagement
  • Visible wear patterns, chipping, or deformation on the starwheel teeth or pocket edges
Engineering Tips
  • Implement regular lubrication with appropriate viscosity oils to reduce friction and wear, especially in abrasive environments
  • Conduct periodic alignment checks and adjust mounting surfaces to ensure precise engagement and reduce uneven loading

Compliance & Manufacturing Standards

Reference Standards
ISO 1940-1:2003 (Balance quality requirements for rotors) ANSI B94.6-1984 (Knurling) DIN 5480-1:2006 (Splined connections with involute splines)
Manufacturing Precision
  • Bore diameter: +/-0.01 mm
  • Tooth profile accuracy: 0.05 mm
Quality Inspection
  • Coordinate Measuring Machine (CMM) dimensional verification
  • Hardness testing (Rockwell C scale)

Factories Producing Starwheel or Pocketed Disc

Manufacturer profiles with relevant production capability in China

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

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are available for starwheel discs in bottle unscrambling systems?

Starwheel discs are typically manufactured from stainless steel (304 or 316 grade), engineering plastics like Acetal or UHMW-PE, or cast aluminum, depending on application requirements for durability, chemical resistance, and weight.

How does a pocketed disc improve bottle handling efficiency?

The precisely shaped pockets in the rotating disc receive randomly oriented bottles, properly orient them, and transfer them to downstream processes, reducing jams and increasing production line speed in packaging systems.

What are the key components of a starwheel assembly?

A typical starwheel assembly includes the main pocket/cavity disc, mounting hub for secure attachment to machinery, and optional wear liners or inserts to extend service life in high-volume applications.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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