30x44mm Aluminum Screw Cap

The 30×44 mm aluminum screw cap is a premium medium-sized bottle cap, widely used for spirits and wines. It features a durable aluminum construction with tamper-evident functionality, an airtight seal achieved through a high-quality liner, and rich branding customization options such as printing and embossing.

The 30x44mm Aluminum Screw Cap is used for alcoholic beverages, preferably with a PE liner or an integrated pourer for tamper-evidence. To enhance brand recognition, a combination of hot stamping and UV printing is recommended.

30x44mm Aluminum Screw Cap Product Details

Attribute	Specification Description
Size	Diameter 30mm × Height 44mm
Material	Food-grade aluminum, compliant with safety and environmental standards (some suppliers certified with ISO/SGS)
Sealing Type	Screw-type tamper-evident cap (ROPP structure), some models include a PE liner or plastic pourer to enhance sealing
Color	Custom colors supported
Printing	Surface options include offset printing, hot stamping, screen printing, embossing, UV printing, etc.
Branding Customization	Supports OEM logo/text printing, exclusive mold development available

30x44mm Aluminum Screw Cap Surface Treatments

Process Type	Features	Applicable Scenarios
Hot Stamping/Embossing	Metallic texture, three-dimensional branding	Premium liquor brands
UV Printing	High-resolution patterns, scratch resistance	Detailed logos or complex patterns
Screen Printing	Rich colors, relatively low cost	Mass production with basic branding

Printing:

The top and sides of the cap are printed using offset or lithographic printing (1–6 colors)

Embossing: Logos or patterns can be embossed on the top or sides of the cap

Roller Coating/Gravure Printing: Smooth and uniform coated surface with glossy, satin, or matte finishes; also applicable to side patterns

Special Treatments: UV printing, hot stamping, and anti-counterfeit inks or effects to enhance security and aesthetics

30x44mm Aluminum Screw Cap Material & Structure

Cap body material: Aluminum alloy (typically 8011 H24)
Lightweight, corrosion-resistant, and durable
Wall thickness: Approx. 0.23 mm, sturdy yet lightweight
Liner: Typically PE or EPE foam, sometimes Saranex/Tin-Saran foam, ensuring a tight seal and leak prevention

30x44mm Aluminum Screw Cap Sealing & Safety Features

Screw-in design: Provides a tight and reliable seal, ideal for spirits such as whiskey, vodka, rum, and tequila
Tamper-evident/non-refillable options: Many versions include a bridge that breaks upon opening or non-refillable liners, providing visible evidence once opened

30x44mm Aluminum Screw Cap Customization & Additional Features

Logos and Patterns: Brands can apply custom designs, embossing, colors, or textured patterns

Optional Features:

Plastic pourer insert

Tamper-evident ring

Multiple liner materials, including Saranex or EPE

Color options available (e.g., black ROPP cap)

30x44mm Aluminum Screw Cap Typical Applications

Spirits and Liquors: Suitable for whiskey, vodka, rum, tequila, and gin bottles
Wine: Suitable for ROPP/BVS screw caps for wine packaging and sealing
Other Liquids: Sometimes used for olive oil, specialty beverages, and even craft products

Special Requirements for Alcohol Packaging

Wine Sector: Some premium wines use aluminum screw caps (as alternatives to corks), which require breathable liners (e.g., microporous PE films) to allow minimal oxygen ingress for aging while avoiding cork taint (TCA odor). Baijiu/Spirits: Cap surfaces are often anodized (e.g., gold or black oxide layer) to enhance wear resistance and texture. Liners must be alcohol-resistant (e.g., nitrile rubber or modified PE).

30x44mm Aluminum Screw Cap Manufacturing Process & Quality Control

Key Forming Process Points

Stamping: Multi-stage progressive die stamping forms the cap body, threads, and tamper-evident ring in one go. Tolerance controlled within ±0.1mm to prevent thread misalignment causing poor sealing
Liner Assembly: Uses automatic hot-melt machines or ultrasonic welding to ensure liner positioning deviation ≤0.5mm, preventing sealing failure

Performance Testing Standards

Seal Test: Inject water pressure at 0.2 MPa for 30 seconds with no leakage;
Torque Test: Opening torque should be within 6–12 N·m (adjusted based on internal pressure), avoiding loosening during transport or excessive opening force;
Corrosion Resistance Test: Placed in 5% salt spray environment for 48 hours, no oxidation spots on the surface

Comparison with Similar Caps

Comparison Dimension	30x44mm Aluminum Screw Cap	Plastic Screw Cap (e.g., PP)	Tinplate Crown Cap
Weight	Approx. 8–12g (Aluminum density 2.7g/cm³)	Approx. 5–8g (PP density 0.9g/cm³)	Approx. 3–5g
Temperature Resistance	-20℃~120℃ (suitable for high-temperature sterilization)	-40℃~80℃ (deforms at high temperatures)	-10℃~60℃ (poor corrosion resistance)
Sealing Performance	Excellent (dual sealing with liner + thread)	Moderate (relies on gasket compression)	Good (one-time seal, fails after opening)
Cost	Medium (higher than plastic, lower than glass stopper)	Low	Low
Suitable Applications	Mid-to-high-end beverages, pharmaceuticals, spirits	Daily beverages, household products	Beer, carbonated drinks (single-use)