Product Specification

Pressure Sensitive Torque Activated Seals Cap Liners Induction Cap Seal Liners Pricelist
 

1. Product Overview

• PSTA Liners: For businesses that don’t have induction machines (e.g., small jam makers, local honey farms). They stick to bottle mouths when you twist the cap to a specific torque (no extra equipment needed)—perfect for low-to-medium production volumes.
• Induction Liners: For high-volume brands (e.g., soda factories, pharmaceutical companies) that use induction sealers. The aluminum layer in the liner melts and bonds to the bottle when heated—unbeatable for leak-proof, tamper-evident seals (critical for liquids or regulated products).

2. Clear Technical Specifications & Parameter Table

2.1 Pressure Sensitive Torque-Activated (PSTA) Liners Specs

2.2 Induction Cap Seal Liners Specs

3. Design & Detail feature (The “Why” Behind Every Choice)

3.1 Pressure Sensitive Torque-Activated (PSTA) Liners: Designed for Simplicity

• Adhesive Activation: No Guesswork: The acrylic adhesive is calibrated to activate at 5-8 N·m—we tested this with 10 different cap tighteners (manual, electric, hand-held) to make sure it works for small brands. A honey farmer in Vermont told us, “Before, we used glue dots that either didn’t stick or glued the cap shut. This liner only sticks when we twist to 6 N·m—perfect every time.”
• PE Foam Layer: Fixes Uneven Bottles: Most small brands use bottles with slightly uneven mouths (cheap plastic molds). The 50μm PE foam conforms to these imperfections—we tested it on a batch of “wonky” jam jars (mouths off by 0.2mm) and had zero leaks.
• No Induction Machine Needed: This is the biggest win. A salsa company in Texas saved $2,000 by not buying an induction sealer—they just use their existing hand-held cap tightener, and the PSTA liners work perfectly.

3.2 Induction Cap Seal Liners: Designed for Reliability

• Aluminum Foil Layer: Freshness First: The 9μm aluminum foil blocks 100% of oxygen and light—we tested it with apple juice: juice in bottles with our induction liner stayed fresh for 6 months; juice with plastic liners went bad in 2 months. A juice brand in Florida switched to our liners and cut spoilage by 40%.
• EVA Adhesive: Bonds to Any Bottle: We tweak the EVA adhesive for your bottle material:
  • For plastic (PET/HDPE): Add 5% more plasticizer to the adhesive (bonds better to flexible plastic).
  • For glass: Use a higher-melt EVA (190°C) to stick to smooth glass.
    A pharmaceutical client in Germany uses our glass-specific liners for bottles—no “peeling seals” or contamination.
• Peelable PE Liner: Clean User Experience: After induction, the PE liner peels off easily (no “stuck” bits) and leaves the aluminum/EVA seal on the bottle. Customers hate picking adhesive off bottle mouths—this design eliminates that frustration.

4. Production Process Flow (Human-Centric Quality)

4.1 Pressure Sensitive Torque-Activated (PSTA) Liners Production

1. Raw Material Prep (Hand-Checked):
   • We buy PET film and PE foam from local suppliers (we visit their warehouses to check for defects—no wrinkled film or uneven foam).
   • The acrylic adhesive is mixed in-house—our technician stirs it by hand for 10 minutes (machine mixing leaves lumps) and checks viscosity with a handheld meter (must be 3000-3500 cP—too thin = runs, too thick = doesn’t spread).
2. Layer Lamination (Slow & Steady):
   • We use a 3-roll laminator (not a fast 5-roll) to bond PET, adhesive, and PE foam. A worker feeds the layers into the machine and watches for bubbles—if they see one, they stop, peel back the layers, and start over (bubbles cause weak spots).
   • We run the laminator at 5m/min (half the speed of cheap suppliers)—this ensures the adhesive spreads evenly.
3. Die-Cutting & Torque Testing:
   • A worker loads the laminated sheet into a die-cutter and sets the diameter (e.g., 28mm for soda caps). They check every 10th liner with a caliper—if it’s off by 0.1mm, they adjust the die.
   • Critical Step: We test 20 liners per batch with your cap/bottle (you send us samples). A technician uses a torque wrench to twist the cap to 5-8 N·m, then peels the liner to check adhesion—only liners that stick evenly pass.
4. Packaging (Dust-Free):
   • Liners are packed by hand into moisture-proof PE bags (1000 liners/bag) with a desiccant pack (prevents adhesive from absorbing humidity). A worker counts each bag twice—no “short” counts.

4.2 Induction Cap Seal Liners Production

1. Aluminum Foil Inspection (No Pinholes):
   • A worker unrolls 1m of 8011-O aluminum foil and holds it up to light—any pinhole (even 0.1mm) means the roll is rejected (pinholes cause leaks). We reject 1 out of 15 rolls—no exceptions.
2. 4-Layer Composite (Precision Bonding):
   • We use a 4-roll laminator to bond PET, aluminum, EVA, and PE. Our engineer adjusts the temperature for the EVA layer (160°C for plastic bottles, 170°C for glass) and checks the bond every 5 minutes—they peel a small section by hand to make sure layers don’t separate.
3. Induction Compatibility Test:
   • We have a small induction sealer in our shop (1kW, like most brands use). A worker seals 10 liners to your bottle, then tests the seal strength with a force gauge—must be 8-12 N/15mm. If it’s too weak, we adjust the EVA adhesive (add more resin) and retest.
4. Final Quality Check (3-Tier):
   • Tech 1: Checks for aluminum foil wrinkles (ruin seals).
   • Tech 2: Tests induction time (0.8-1.5 seconds—matches your line speed).
   • Tech 3: Inverts a sealed bottle with water for 1hr—no leaks = pass.

5. Application Scenarios (Which Liner Is Right for You?)

5.1 Pressure Sensitive Torque-Activated (PSTA) Liners: Best For…

• Small-Batch Food Brands: Jams, honey, syrups, nut butters (production: 100-1000 bottles/day). Example: A Vermont honey farm uses 38mm PSTA liners—they twist caps by hand to 6 N·m, no induction machine needed.
• Local Beverages: Craft soda, cold-brew coffee, fruit juices (no need for high-speed lines). Example: A Portland soda company uses 28mm PSTA liners—they use a $50 hand-held cap tightener, and seals hold during delivery.
• Low-Cost Startups: Brands that can’t afford an induction sealer ($1,500+). PSTA liners let you offer sealed caps without the upfront cost.

5.2 Induction Cap Seal Liners: Best For…

• High-Volume Food/Beverages: Bottled water, soda, sports drinks (production: 1000+ bottles/day). Example: A Florida water brand uses 28mm induction liners—their 3kW sealer handles 150 bottles/minute, zero leaks.
• Pharmaceuticals & Supplements: Pill bottles, liquid vitamins, medical syrups (regulated, need tamper-evident seals). Example: A German pharma company uses 20mm induction liners—meets GMP standards, no contamination risks.
• Chemicals & Household Cleaners: Detergents, solvents, pesticides (need leak-proof seals for toxic liquids). Example: An Ohio cleaner brand uses 50mm induction liners—seals hold even when jugs are dropped.

6. Pricelist (Transparent, No Hidden Fees)

Notes on Pricing:

• Custom Sizes: Diameters outside 20mm-80mm (e.g., 15mm, 90mm) add $0.02/unit (MOQ 5000).
• Shipping: Free to US/Canada for orders over $500; international shipping quoted per order (we use DHL/FedEx).
• Samples: Free samples (50 liners) – you pay only shipping ($5-US, $15-international).