Product Specification

Heat Seal Induction Aluminium Foil Seals Lids Liners For Bottle

1. Product Overview

2. Core Product Features (Built for Reliability)

2.1 Food-Grade & Compliance-Ready Materials

• Top Layer (Carrier Film): 12μm PET (polyethylene terephthalate) – rigid enough to stay flat during induction, yet thin enough to peel off cleanly. Meets FDA 21 CFR 177.1310 and EU LFGB §30 for food contact.
• Middle Layer (Aluminium Foil): 9μm food-grade aluminium – blocks oxygen, light, and moisture (critical for products like powdered supplements or oil-based sauces that spoil easily). 100% recyclable, with no heavy metals (tested quarterly by SGS).
• Bottom Layer (Heat-Seal Adhesive): EVA-based (ethylene-vinyl acetate) adhesive – bonds to most bottle materials (PET, HDPE, PP, glass) without melting or leaching. Choose “acid-resistant” adhesive for citrus juices/vinegars, or “high-temp” adhesive for products stored at 50°C+ (e.g., hot sauces).

2.2 Tamper-Evident & Leak-Proof Performance

• Tamper-Proof Design: When the bottle cap is first twisted off, the aluminium foil liner stays sealed to the bottle neck—customers see a clear “unbroken seal” before use. If the seal is peeled, it tears into small pieces (can’t be reattached), so you avoid tampering risks.
• 100% Leak Resistance: Tested by filling bottles with water, sealing with our liner, and inverting them for 72 hours (no drips, even for bottles shipped via air or ground). We also test with thick liquids (honey, ketchup) to ensure the seal doesn’t lift during transport.
• Seal Strength: Requires 3-5 lbs of force to peel (enough to stay secure, but easy for adults to remove). We adjust adhesive thickness (20-30μm) based on your bottle material—thicker for HDPE, thinner for glass—to get this balance right.

2.3 Wide Compatibility with Bottles & Induction Machines

• Bottle Mouth Sizes: We make liners for 20mm to 100mm bottle necks (the most common sizes for consumer products). Popular options include 28mm (for hand sanitizers), 38mm (for sauces), and 50mm (for large-format cleaning products).
• Induction Machine Fit: Works with all standard induction sealers (1-5kW, manual or automatic). We provide a “seal parameter guide” (temperature: 180-220°C, dwell time: 0.8-1.5 seconds) to help your team avoid under-sealing (leaks) or over-sealing (liner burns).
• Cap Compatibility: Works with screw-on caps (PP, HDPE) and flip-top caps—no need to modify your existing cap design. The liner fits neatly inside standard cap wells (depth: 1.5-2mm).

3. Design & Detail (The Small Things That Matter)

3.1 Layer Thickness Precision

• Too-thin aluminium foil: Tears during induction, leading to partial seals.
• Too-thick adhesive: Oozes out around the bottle neck, leaving a sticky residue.
  We use a laser thickness gauge (accuracy ±0.1μm) to check 10% of liners per batch—so you never get a “dud” liner.

3.2 Edge & Cut Quality

• Clean, Burr-Free Edges: Our die-cutting machines use sharp, custom steel dies to cut liners—no ragged edges that catch on caps or peel prematurely. We inspect edges under a 10x magnifier to ensure smoothness.
• Consistent Diameter: Each liner’s diameter is within ±0.1mm of your order specs. For example, a 28mm liner will always be 28.0-28.1mm—wide enough to cover the bottle neck fully, but not so wide that it bunches up in the cap.

3.3 Adhesive Pattern Optimization

• Prevents adhesive from seeping into the bottle’s thread grooves (which would make the cap hard to twist).
• Ensures the adhesive only bonds to the flat “sealing surface” of the bottle neck—creating a stronger seal.
  For smooth-neck bottles (e.g., some glass jars), we use full-coverage adhesive—just let us know your bottle type, and we’ll adjust.

3.4 Storage & Shelf-Life Details

• Moisture-Resistant Packaging: Liners are packed in vacuum-sealed PE bags (1,000 liners per bag) inside corrugated cartons with desiccant packs. This keeps the adhesive from absorbing moisture (which ruins bond strength) during storage.
• Shelf Life: 18 months from production date (when stored at 15-25°C, 30-60% humidity). Each carton is labeled with a clear “use by” date—no guessing if liners are still good.

4. After-Sales Assurance (We Stand Behind Our Liners)

4.1 Quality Inspection & Replacement Promise

• Pre-Shipment Sample: Before we ship your full order, we send 50 free liners for your team to test. If they don’t seal properly, or don’t fit your bottles, we rework the order (adjust size, adhesive type, or thickness) at no cost.
• Batch Defect Coverage: If more than 0.5% of liners in your order are defective (e.g., weak seal, torn foil), we replace the entire batch—plus cover the cost of shipping the defective liners back to us. Just send us photos of the issue within 30 days of receiving the order, and we’ll start the replacement process within 24 hours.

4.2 Dedicated Technical Support

• On-Site or Remote Help: If your team is struggling with induction sealing (e.g., inconsistent seals), we send a technician to your facility (free for orders over 50,000 units) or offer a video call walkthrough (for smaller orders). We’ll adjust your induction machine settings, test liners with your bottles, and train your staff—until the seal is perfect.
• Troubleshooting Guide: Every order includes a printed “Problem-Solver Guide” with solutions to common issues:
  • “Liner won’t peel”: Adhesive is too thick—we send a replacement batch with thinner adhesive.
  • “Seal leaks around the edge”: Liner diameter is too small—we send a larger size at no cost.

4.3 Flexible Return & Refund Policy

• Unused Liners: If you order the wrong size (e.g., 38mm instead of 28mm) and the liners are unused (still in sealed bags), we accept returns within 45 days. We’ll refund 90% of your cost (to cover our die-cutting expenses) or exchange for the correct size—your choice.
• Cancelled Orders: If you need to cancel an order before production starts, we refund 100% of your deposit. If production has started, we refund 70% (since we’ve already purchased materials for your order).

4.4 Long-Term Partnership Benefits

• Batch Traceability: Every liner has a batch number printed on the packaging. If you ever need to recall a product, we can provide full records (material suppliers, production date, test results) within 1 hour—helping you meet regulatory requirements fast.
• Volume Discounts: For repeat customers, we offer 5-15% discounts on orders over 100,000 units. We also lock in prices for 12 months—so you don’t have to worry about material cost hikes.

5. How to Order (Simple, No Surprises)

1. Share Your Bottle Details: Email us with:
   • Bottle neck diameter (e.g., 28mm) and material (e.g., HDPE).
   • Product type (e.g., tomato sauce—so we recommend acid-resistant adhesive).
   • Induction machine power (e.g., 3kW—for our seal parameter guide).
2. Get a Free Test Sample: We’ll send 50 liners (free of charge) within 3 business days. Test them with your bottles and induction machine—let us know if you need adjustments.
3. Place Your Order: Once you’re happy with the sample, we’ll send a detailed quote (no hidden fees). Minimum order quantity is 5,000 units—perfect for small brands, with bulk pricing starting at 10,000 units.
4. Track Production: We share a production timeline (usually 7-10 days for standard sizes) and send weekly updates. You’ll get a tracking number as soon as the order ships.