8011 O-Temper 0,009 mm aluminiumfolie voor melkdoppen
8011 O-Temper 0,009 mm aluminiumfolie voor melkdoppen
1. Invoering
1.1 Overzicht van 8011 O-Temper Aluminum Foil
- Basic Characteristics of 8011 Aluminium profiel: Belongs to the Al-Fe-Si series alloy. It features stable composition, uitstekende verwerkingsprestaties, and is free from harmful heavy metal impurities, meeting food-grade standards. It combines good ductility, vervormbaarheid, en barrière-eigenschappen, making it suitable for the multi-step processing required for milk caps.
- Meaning of O-Temper: Refers to the fully annealed state. High-temperature annealing eliminates internal stress, resulting in a soft foil with excellent ductility. This prevents cracking and creasing during stamping, making it the optimal temper for milk cap foil.
- Advantages of 0.009mm Thickness: Balances lightweight construction, barrière-eigenschappen, and easy-open functionality. It bonds tightly with various substrates, reducing packaging costs and energy consumption while ensuring controlled peel strength for convenient consumer opening.
1.2 Market Demand & Industry Background
- Global dairy consumption continues to grow, with emerging markets as the core growth driver, providing a vast market for milk cap foil. Upgraded food safety standards worldwide and the green packaging trend under “Dual Carbon” goals are driving the widespread adoption of 8011 O-temper foil.
2. Fundamentals of 8011 Aluminium profiel
2.1 Chemische samenstelling van 8011 Aluminium profiel
- 8011 alloy has an aluminum purity ≥99.0%. Core alloying elements are Fe (0.7%-1.3%) en Si (0.2%-0.7%), with impurity elements ≤0.1%. Fe and Si refine grains, enhance strength and rolling performance, ensuring foil quality.
- In vergelijking tot 1235 En 8079 legeringen, 8011 offers the best balance of strength, ductiliteit, en kosteneffectiviteit, making it the top choice for milk caps. Specific parameters are shown below.
| Legering kwaliteit | Aluminiumzuiverheid | Core Alloying Elements | Key Performance Characteristics | Main Application Scenarios |
|---|---|---|---|---|
| 8011 | ≥99,0% | Fe (0.7%-1.3%), En (0.2%-0.7%) | Evenwichtige kracht & ductiliteit, gematigde kosten, uitstekende verwerkbaarheid | Dairy packaging like milk caps |
| 1235 | ≥99,35% | Primarily Mn | Uitstekende ductiliteit, lower strength | Laminate foil for ordinary food packaging paper |
| 8079 | Slightly lower than 8011 | Primarily Fe, mg | Grote sterkte, poor ductility, difficult to roll, hoge kosten | High-end barrier packaging (bijv., pharmaceutical blister packs) |
3. Performance Characteristics of 8011 O-Temper 0.009mm Foil
3.1 Kern technische parameters
| Prestatie-indicator | Typical Parameter | Teststandaard | Opmerkingen |
|---|---|---|---|
| Dikte | 0.009mm (±0,0005 mm) | GB/T 4947-2010 | Can be fine-tuned per customer requirements |
| Treksterkte | 70-90 MPa | GB/T 228.1-2010 | O-temper, consistent longitudinal/transverse properties |
| Verlenging | ≥30% | GB/T 228.1-2010 | Ensures resistance to cracking during stamping |
| Surface Wettability | 38-42 mN/m | GB/T 14216-2008 | After corona treatment, suitable for coatings & lamineren |
| Pinholes Density | ≤3 /m² (Diameter ≤0.03mm) | GB/T 3048.10-2007 | No clustered pinholes, guaranteeing barrier performance |
| Barrière-eigenschappen | Oxygen TR ≤0.1 cm³/(m²·24h·atm), Water Vapor TR ≤0.1 g/(m²·24u) | GB/T 1038-2000, GB/T 16928-2018 | Properties of standalone foil; performance improves after lamination |
3.2 Additional Core Performance Features
- Barrière & Behoud van versheid: Excellent light-blocking, zuurstofbarrière, and moisture-proof properties protect dairy nutrition and flavor, inhibit bacterial contamination, and extend shelf life.
- Warmteafdichtbaarheid: Compatible with PE/PP heat seal layers. Heat seal strength ≥3N/15mm ensures leak-proof sealing, suitable for various dairy filling and high-speed production lines.
- Veiligheid & Hygiëne:Niet giftig, geurloos, free from heavy metal impurities, complies with domestic and international food contact standards, safe for direct contact with dairy products.
- Bedrukbaarheid & Decoratie: Smooth surface with strong ink adhesion, allowing for printing and embossing to enhance packaging aesthetics and brand recognition.
- Easy-Open Feature: Controlled peel strength enables smooth opening without sharp edges, providing a good user experience.
4. Productieproces van 8011 O-Temper Milk Cap Foil
4.1 Raw Material Selection
- Use aluminum ingots with purity ≥99.7%. After melting and refining, harmful impurities ≤0.001%. Precise control of Fe/Si content; filtration ensures inclusions ≤5μm.
4.2 Rollend proces
- Ingots undergo homogenization at 450-500°C, hot rolling at 350-400°C to 3-5mm, multi-pass cold rolling to 0.015-0.02mm, then twin-roll rolling to 0.009mm with strict precision control.
4.3 Gloeiproces
- Continuous annealing at 300-400°C for 2-4 hours achieves O-temper softening, eliminates internal stress, prevents edge waving or deformation, and ensures processability.
4.4 Oppervlaktebehandeling & Coating
- Alkaline degreasing and drying. Apply 0.1-0.2μm primer and 1-2μm PE heat seal coating. Corona treatment raises surface tension to 38-42 mN/m for lamination and printing compatibility.
4.5 Snijden & Inspectie van eindproducten
- Slit to required widths (width tolerance ±0.1mm). Undergoes multiple inspections including pinholes and thickness. Packaged with moisture-proof materials; strict control of storage/transport temperature and humidity.
5. Laminated Structures for Milk Caps
5.1 Common Laminated Structures
| Gelamineerde structuur | Toepassingsscenario | Structural Advantages | Suitable Dairy Types |
|---|---|---|---|
| PET/AL/PE | Yogurt cups, fresh milk bottle seals | Balances aesthetics, barrière, en smeltlassen; highly practical | Yogurt, verse melk, dairy beverages |
| Papier/AL/PE | Milk powder cans, protein powder can seals | Rigid, vochtbestendig, suitable for rigid containers | Melkpoeder, protein powder, whey powder |
| AL/Heat Seal Layer | Small dairy product seals | Eenvoudige structuur, goedkoop, suitable for high-speed production | Small yogurt cups, single-serve fresh milk |
| PET/AL/PET/PE | Premium dairy product seals | High-end appearance, strong protection | Premium yogurt, organic milk |
5.2 Function of Each Layer & Equipment Compatibility
- Buitenste laag (PET/Paper): Carries printing, provides rigidity. Middelste laag (Aluminiumfolie): Core barrier, ensures safety. Binnenlaag (PE/PP): Seals against leakage.
- Compatible with high-speed filling (300-1000 units/min) and automatic sealing equipment. Withstands 121°C high-temperature sterilization, suitable for various dairy sterilization processes.
6. Key Technical Standards & Quality Requirements
6.1 Internationale normen & Testmethoden
- Complies with FDA (21 CFR 175.300), EU (EG) Nee 1935/2004 normen. Follows ISO 22000, ISO 9001 kwaliteitssystemen. Undergoes multiple tests: gaatjes, sterkte van de heatseal, oppervlaktereinheid, enz.
6.2 Core Quality Indicators
| Indicator | Vereiste | Impact of Non-Conformity |
|---|---|---|
| Oppervlaktereinheid | No oil/stains, oil ≤5mg/m² | Affects lamination, contaminates dairy |
| Pinholes Rate | ≤3 /m², Diameter ≤0.03mm | Reduced barrier, product spoilage |
| Dikte tolerantie | ±0,0005 mm | Stamping cracks, unstable heat sealing |
| Sterkte van de hitteafdichting | ≥3N/15mm | Poor seal, leakage risk |
7. Vergelijking met andere verpakkingsmaterialen
7.1 Aluminum Foil Cap vs. Plastic Cap
| Vergelijkingsdimensie | 8011 O-Temper Aluminum Foil Cap | Traditional Plastic Cap |
|---|---|---|
| Barrier/Freshness | Uitstekend, extends shelf life | Arm, prone to oxidation/spoilage |
| Eco-Friendliness/Print | Recyclebaar, excellent print quality | Hard to degrade, average print quality |
| Kosten | Gematigd, high overall cost-effectiveness | Lower initial cost, higher loss rate |
7.2 Vergelijking: 8011 tegen. 1235 tegen. 8079 Aluminiumfolie
| Eigendom | 8011 | 1235 | 8079 |
|---|---|---|---|
| Suitability for Milk Caps | Optimal (Balance of processability & gemakkelijk te openen) | Good ductility but low strength | High strength but poor formability |
| Vormbaarheid | Uitstekend | Goed | Arm |
8. Toepassingsscenario's & Toepassingen
8.1 Kerntoepassingsscenario's
- Dairy Packaging Seals: Covers fresh milk, yoghurt, dairy drinks, melkpoeder, protein powder, enz. Suitable for cups, flessen, and cans.
- Food Packaging Auxiliary: Used for sealing small foods, gezondheidsproducten, enz. Leverages barrier properties to extend shelf life on high-speed automated lines.
- Hoogwaardige verpakking: Ideal for organic or imported dairy products, combining sealing performance with premium aesthetics to enhance brand perception.
8.2 Primary Uses
- Sealing Barrier: Isolates oxygen, vocht, licht, and microbes to prevent oxidation, bederf, and leakage, ensuring product quality and safety.
- Convenient Usage: Controlled peel strength allows for easy tearing without sharp edges, improving consumer experience for all user groups.
- Brand Enhancement: Printable and embossable surface carries brand information and product identification, boosting aesthetics and recognition.
- Groente & Milieuvriendelijk: 100% recyclebaar, aligns with green packaging trends, reduces packaging waste pollution, and meets industry development requirements.
9. Veelgestelde vragen (FAQ)
Q1: Why has 8011 O-Temper 0.009mm foil become the preferred material for milk caps?
A1: The core advantage lies in its combination of cost-effectiveness and performance suitability. The Fe/Si ratio in 8011 offers excellent processability and barrier properties. The O-temper ensures crack-free stamping. The 0.009mm thickness balances lightweight construction, gemakkelijk openen, en kostenbeheersing, while meeting food-grade standards—perfectly matching the core needs of dairy packaging.
Q2: Why is the thickness tolerance so strictly controlled at ±0.0005mm?
A2: Thickness tolerance directly impacts processing performance and product quality. Excessive deviation leads to stamping breakage or unstable heat sealing in thin areas, while thick areas increase cost and hinder easy opening. The ±0.0005mm tolerance ensures the foil works flawlessly on high-speed stamping and sealing lines, guaranteeing batch-to-batch consistency.
Q3: Wat zijn de belangrijkste verschillen tussen 8011, 1235, En 8079 folies?
A3: 1235 has higher purity but lower strength, suitable for ordinary laminates but not milk cap stamping. 8079 has high strength but poor ductility, is harder to roll, and costs more, typically used for pharmaceuticals. 8011 offers the best balance of strength, ductiliteit, en kosten, making it the optimal choice for milk caps.
Q4: Why is pinhole density controlled at ≤3 /m²? What’s the impact of too many pinholes?
A4: Pinholes compromise the barrier integrity. Excessive pinholes (>3 /m²) allow oxygen, vocht, and microbes to enter the package, causing dairy products to oxidize, spoil, and shorten shelf life. Strict control ensures effective barrier performance.
Q5: Which dairy scenarios is this foil suitable for? Can it withstand high-temperature sterilization?
A5: Suitable for fresh milk, yoghurt, melkpoeder, dairy drinks, enz., for cups, flessen, and cans. It withstands 121°C high-temperature sterilization, fully compatible with various dairy sterilization processes without affecting its performance or food safety.
Vraag 6: How recyclable is 8011 O-temper foil, and does it meet green packaging trends?
A6: This foil is 100% recyclebaar. Post-consumer scrap can be re-melted and reprocessed without generating polluting waste. This aligns perfectly with the green packaging trend driven by “Dual Carbon” goals and meets the environmental development requirements of the global food packaging industry.
