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Brushed aluminium screw caps

What Are Brushed Aluminium Screw Caps?

Brushed aluminium screw caps are aluminium threaded caps whose surface has undergone a brushing process. Unlike glossy caps, brushed surfaces have a modern look and are fingerprint-resistant, making them ideal for the high-end packaging market.

"Brushed aluminium screw caps" usually refer to screw caps made primarily of aluminium alloy, formed by deep drawing, with their surface treated through brushing.

"Brushing" is a surface treatment process that creates directional streaks on the aluminium surface through friction, resulting in a unique metallic texture and tactile feel, while also partially masking scratches that may occur during use.

Brushed Aluminium Screw Caps

Brushed aluminium screw caps are a premium packaging solution that combines metallic aesthetics with functionality, widely used in packaging for wines, cosmetics, food, and pharmaceuticals. Due to their unique textured appearance, durability, and excellent sealing performance, brushed aluminium screw caps are extensively applied in various packaging fields.

Customization Options for Brushed Aluminium Screw Caps

HC Aluminum provides diverse customization services to help customers create unique brand packaging:

  • Size options: Customizable in different diameters and heights to fit a wide range of bottles.
  • Brushing finish: Available in fine, medium, and deep textures, offering different visual and tactile effects.
  • Surface treatment: Supports color anodizing to achieve personalized appearance and brand recognition.
  • Branding customization: Options include logo printing, embossing, or laser engraving to enhance product recognition and premium appeal.

Brushed Aluminium Screw Caps Material Options

Common aluminium alloy grades used for brushed aluminium screw caps include 8011 and 3105. The inner surface of the cap is often coated with lacquer to bond better with the plastic liner, ensuring high sealing quality.

Brushed aluminium screw caps are also often made from lightweight alloys (such as the 3004 or 5052 series) as the base material. The brushing process creates delicate metallic patterns on the surface, which can include straight grain, random grain, swirl patterns, and more.

Before brushing, degreasing and acid pickling pretreatment are required. After brushing, anodizing or food-grade coatings are typically applied to enhance corrosion resistance and aesthetics. For example, cosmetic caps often use anodizing to create a wear-resistant and color-stable surface.

Brushed Aluminium Screw Caps Liner Design

The inner wall of the screw cap matches precisely with the bottle neck threads, and works with liner materials to achieve efficient sealing. Common liners include EPE (expanded polyethylene foam), plastisol, or induction seals. Among them, EPE liners are widely used in cosmetic products, ensuring no leakage under -60kPa negative pressure. In the pharmaceutical field, aluminium-plastic composite liners are often adopted to balance sealing with drug compatibility.

Brushed Aluminium Screw Caps Manufacturing Process

  • ‌Basic forming: Aluminium sheets are stamped into the initial cap shape by a press machine.
  • ‌Brushing treatment: Mechanical or chemical methods create uniform streak patterns on the surface, enhancing texture and anti-slip properties.
  • ‌Secondary processing: May include anodizing or electroplating (e.g., bright gold, bronze) or printed patterns. Some products may require the insertion of sealing gaskets.

Features of Brushed Aluminium Screw Caps

  • Premium appearance: Brushed texture gives the caps a refined and modern look, elevating product presentation, ideal for high-end packaging.
  • Durable and practical: Aluminium is lightweight and strong, with excellent corrosion resistance. The brushed surface effectively hides scratches and fingerprints.
  • Excellent sealing: Provides airtight sealing to maintain product freshness. Some types are also equipped with tamper-evident rings (ROPP) for enhanced safety.
  • Eco-friendly and recyclable: Made from 100% recyclable aluminium, aligning with sustainable packaging trends.
  • Customizable: Supports anodizing, printing, or laser engraving, enabling personalized brand design and promotion.

Applications of Brushed Aluminium Screw Caps

  • Alcoholic beverages and drinks: Widely used in wine, whisky, premium beer, and juices. Their excellent sealing surpasses traditional corks, better preserving flavors, while their lightweight and durable properties make them suitable for all types of beverage packaging.
  • Cosmetics and personal care: Ideal for skincare, perfumes, lipsticks, and other premium products. The brushed texture elevates packaging, with multiple specifications (e.g., 28-thread, 70-thread) and customizable anti-slip designs, balancing aesthetics and functionality while protecting contents.
  • Food and condiments: Suitable for food requiring high sealing, such as honey, olive oil, and coffee. Whether for hot or cold filling processes, they provide excellent barrier properties, ensuring freshness and original taste.
  • Pharmaceuticals and healthcare: Essential for packaging oral liquids and medicine bottles. Aluminium caps can withstand high temperatures (up to 121°C sterilization), resist corrosion, and often come with tamper-evident rings (ROPP), ensuring the safety and reliability of medicines.
  • General high-end packaging: The modern brushed texture significantly enhances product quality, making it applicable to any packaging that emphasizes premium aesthetics and reliable sealing protection.

Advantages of Brushed Aluminium Screw Caps

  • Outstanding texture and appearance: Elegant brushed patterns and matte texture provide a high-end, refined look and feel, enhancing brand image.
  • Reliable sealing and preservation: Precision thread design ensures excellent airtightness, preventing leakage and keeping contents fresh for a long time.
  • Strong and durable practicality: Aluminium is lightweight yet strong, and the brushed surface effectively conceals scratches and fingerprints, ensuring long-lasting durability in daily use.
  • High flexibility in customization: Supports anodizing, embossing, printing, and laser engraving, allowing brands to customize colors, logos, and textures.
  • Superior eco-friendliness and sustainability: Made from 100% recyclable aluminium. From a life cycle assessment (LCA) perspective, it demonstrates significant environmental friendliness, aligning with modern green packaging trends.

How to Choose Brushed Aluminium Screw Caps

Choose the cap type based on functionality

  • Standard screw caps: Suitable for everyday products that do not require tamper evidence. When selecting, focus on the precision of the thread design and the liner material (e.g., EPE) to ensure basic sealing performance.
  • Tamper-evident screw caps: Equipped with a tamper ring that breaks upon opening, providing visible proof of tampering. Ideal for wines, premium beverages, and pharmaceuticals, ensuring product safety.

Pay attention to material and process parameters

The alloy grade (such as 8011, 3105) and temper (H14, H16, etc.) directly determine the strength, formability, and durability of the caps. Always confirm these basic parameters with your supplier to meet your filling, transportation, and storage requirements.

Evaluate customization options

Brushed aluminium caps offer a wide range of choices in color and size. In addition, embossing, printing, or laser engraving can be applied to the cap top or sides to display brand logos and exclusive designs, effectively enhancing brand recognition.

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