30x60mm Aluminum Screw Caps for Wine Bottles with Anti Corrosion Coating
The 30x60mm aluminum screw cap is a two-piece, continuous-thread closure engineered for still and sparkling wines, fortified wines, and premium non-alcoholic beverages. The cap is manufactured from lightweight yet robust aluminum alloy and is finished with an anti-corrosion coating optimized for long-term contact with acidic wine environments. Its 30mm diameter and 60mm skirt/height profile make it suitable for larger-neck or specialty wine bottles and for bottles that require a more decorative or tamper-evident closure.
benefits:
- Excellent corrosion resistance in acidic wine environments
- Lightweight and recyclable
- Consistent sealing performance with liners compatible with wine chemistry
- Adaptable aesthetic finishes and printing/embossing options
- Suitable for automated capping lines
Typical Applications
- Red, white, and rosé wines (still)
- Fortified wines (port, sherry)
- Premium sparkling wines (with appropriate liner and pressure testing)
- Non-alcoholic vinegars and specialty beverage products
- Limited edition and gift-packaged wines requiring premium closures
- Wineries requiring corrosion-resistant closures for extended aging or export
Material and Coating
- Base material: Aluminum alloy (cold-rolled)
- Common alloy grade: 3104-H18 (or equivalent beverage-grade alloy)
- Anti-corrosion coating: Multi-layer organo-inorganic coating system (primer + conversion layer + protective topcoat)
- Liner options: Heat-sealable induction liners, EPE (expanded polyethylene), PVDC-coated liners, or custom formulations compatible with wine pH and sulfite content
- Food contact compliance: Materials and coatings formulated to comply with relevant food-contact regulations (e.g., FDA 21 CFR where applicable, and EU Framework Regulation (EC) No 1935/2004); certificates available on request
Chemical Composition (Typical for 3104 series base alloy)
| Element | Typical Content (wt %) |
|---|---|
| Al | Balance |
| Mn | 0.5 – 1.0 |
| Mg | 0.1 – 0.5 |
| Fe | ≤ 0.7 |
| Si | ≤ 0.6 |
| Cu | ≤ 0.1 |
| Cr | ≤ 0.1 |
| Zn | ≤ 0.25 |
| Ti | ≤ 0.15 |
Note: Actual alloy selection can be tailored based on supplier and manufacturing process. Equivalent beverage-grade alloys (e.g., 3003, 3104) may be offered.
Technical Specifications
| Parameter | Specification |
|---|---|
| Cap type | Screw cap, continuous thread |
| External diameter | 30.0 mm ± 0.1 mm |
| Height / skirt length | 60.0 mm ± 0.3 mm |
| Material thickness (wall) | 0.20 – 0.30 mm typical |
| Alloy | 3104-H18 (typical beverage grade) |
| Coating system | Anti-corrosion multi-layer; color/custom finishes available |
| Liner types | Induction-seal, EPE, PVDC-coated, custom wine-compatible liners |
| Torque (sealing) | 1.0 – 4.0 N·m (adjustable; depends on liner and bottle finish) |
| Operating temperature | -20 °C to +60 °C (storage and filling conditions) |
| Shelf life (coated) | >24 months typical in ambient dry storage |
| Compliance | Food-contact certified materials; RoHS where applicable |
| Recycling | 100% recyclable aluminum (separate from liners where required) |
Mechanical & Performance Data
| Test / Property | Typical Result / Range | Test Standard / Note |
|---|---|---|
| Tensile strength (alloy sheet) | 120 – 180 MPa | Supplier mill data |
| Elongation (%) | 1 – 6% (H18 temper) | Cold worked temper characteristics |
| Corrosion resistance (salt spray) | > 72 h without substrate corrosion (coated) | ISO 9227 accelerated test; results depend on coating thickness |
| Seal integrity (liquid leakage) | Pass at recommended torque | Internal leakage tests per customer protocol |
| Torque retention after aging | < 10% change over 6 months at ambient | Depends on liner and bottle finish |
| Migration / extractables | Within regulatory limits | Tested per food-contact guidelines on request |
Coating Characteristics
- Primer: Promotes adhesion to aluminum and provides initial corrosion barrier.
- Conversion layer: Often a thin oxide or phosphate conversion for enhanced adhesion and barrier properties.
- Topcoat: UV-stable, UV/solvent-curable topcoats available in matte, gloss, metallic, or pearlescent finishes.
- Thickness: Typical total dry film thickness 3–12 µm (depends on finish and customer specification).
- Decoration: Screen printing, offset printing, hot stamping, embossing, and laser etching options available.
- Anti-corrosion performance: Engineered to resist wine acids (pH ~2.8–4.0) and sulfite exposure for long-term contact.
Liner Options & Compatibility
| Liner Type | Typical Use Case | Compatibility Notes |
|---|---|---|
| Induction-seal liner (foil/PVdC) | Tamper evidence; high leak protection | Requires induction sealing equipment; excellent barrier |
| EPE (expanded polyethylene) | Light sealing; cost-effective | Good for still wines; may require secondary barrier for long-term aging |
| PVDC-coated PE | Improved barrier against oxygen | Suitable for wines needing moderate oxygen control |
| Custom PVDF / multilayer | Low oxygen transmission; premium wines | Best for extended cellaring; higher cost |
Selecting the correct liner depends on desired oxygen ingress rate (OIR), storage/aging time, and sulfite levels. We can provide guidance and oxygen transmission data (OTR) per liner upon request.
Packaging & Supply Options
- Standard packaging: 1,000 – 5,000 pieces per carton, inner trays to avoid cosmetic damage
- Palletization: Custom pallets with shrink-wrap and corner protection
- Minimum order quantity: Typically small production runs available for sampling; bulk MOQ depends on finish and decoration
- Lead times: Samples 1–3 weeks; production 4–8 weeks depending on quantities and decoration
- Quality control: Full inspection (dimensional, coating adhesion, seal performance) before shipment; certificates available on request
Installation & Handling Recommendations
- Capping equipment: Compatible with most rotary and chuck-style screw cappers; ensure correct mandrel for 30mm diameter
- Torque settings: Determine optimum torque in trial runs—start low and increase until seal integrity is reached without deforming skirt (typical 1.0–4.0 N·m)
- Storage: Keep in a cool, dry environment; avoid direct sunlight and humidity to protect coatings and liners
- Pre-use inspection: Check for scratches, dents, or coating defects that could affect corrosion resistance or aesthetics
- Recycling: Remove liners where required by local recycling programs; aluminum cap bodies are recyclable through standard metal recycling streams
Quality & Regulatory
- Food-contact compliance: Materials selected to comply with applicable regulations (EU, FDA); documentation/certificates provided per contract
- Traceability: Batch traceability from coil/ingot through forming and coating; lot numbers printed on packaging upon request
- Testing options: Custom testing available, including accelerated shelf-life, OTR for liner systems, migration/extractables testing, and corrosion testing tailored to wine chemistry
- Certifications: ISO 9001 manufacturing practices available from selected facilities; additional audits welcome
Customization & Branding
Options available:
- Full-color printing or limited spot colors
- Metallic and pearlescent topcoats
- Embossing/debossing for tactile branding
- Tamper-evident perforations or tear bands
- Numbering or QR codes for traceability or marketing campaigns
- Custom liners tuned for specific wine OIR requirements
Lead times and MOQs for decorated caps vary—contact sales with artwork and required quantities for a formal quote.
Why Choose These 30x60mm Screw Caps?
- Corrosion protection designed specifically for acidic wine environments
- Robust mechanical properties of beverage-grade aluminum
- Wide range of lining systems to control oxygen ingress and ensure product integrity
- High customizability for premium branding and tamper evidence
- Proven compatibility with automated filling and capping lines
| Item | Value |
|---|---|
| Model | 30x60mm Aluminum Screw Cap |
| Diameter | 30.0 mm ± 0.1 mm |
| Height | 60.0 mm ± 0.3 mm |
| Material | 3104-H18 (typical) |
| Coating | Multi-layer anti-corrosion |
| Liner options | Induction, EPE, PVDC, custom |
| Applications | Still wine, fortified wine, premium beverages |
| Compliance | Food-contact certified |
If you would like:
- Sample caps for testing (please provide shipping address and bottle finish), or
- Detailed OTR / migration test data for specific liner choices, or
- A formal quotation including decoration and lead time,
please provide your requirements: expected annual quantity, desired liner type, bottle finish (thread profile), and any decoration preferences. We will respond with tailored technical data, pricing, and lead time.
