quality PE Foam Breathable Vent Seal Liner For Laundry Detergent / Fabric Softener Bottles factory
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quality PE Foam Breathable Vent Seal Liner For Laundry Detergent / Fabric Softener Bottles factory
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PE Foam Breathable Vent Seal Liner For Laundry Detergent / Fabric Softener Bottles

Brand Name: OEM/ODM
Model Number: OEM/ODM
Place of Origin: China
Certification: IATF16949/ISO
Minimum Order Quantity: 20,000 pcs
Price: Negotiable
Supply Ability: Monthly Output: 300,000 sqm

Product Details


Color: White Thickness: 0.10 – 0.50 Mm
Air Permeability: Gurley:3 – 30 S/100ml @ 300 Ml Water Entry Pressure: ≥ 400 KPa
Waterproof Rating: IP68 Moisture Vapor Transmission Rate: 8,000 – 18,000 G/m²·24h
Oleophobicity Grade: ≥ 7 90° Peel Strength: ≥ 15 N/25mm
Operating Temperature: -40°C To +150°C Size: Customizable
Material Compliance: PFAS Free Chemical Resistance: Corrosion-resistant,Acid-resistant
Highlight

Breathable Vent Seal Liner

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PE Foam Vent Seal Liner

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Fabric Softener Bottles Seal Liner

Product Description

Product Overview

The PE foam breathable vent liner is a specialized induction seal liner engineered for laundry detergent and fabric softener bottles. It combines a resilient polyethylene foam backing with a precisely integrated ePTFE waterproof breathable membrane window, providing continuous pressure equalization while maintaining a leak-proof, tamper-evident seal. Designed for hot-fill, cold-fill, and oxygen-generating formulations, this liner prevents common packaging failures including bottle paneling, bottom bulging, and messy leakage. Its compressible PE foam core compensates for bottle neck irregularities, ensuring consistent sealing torque retention, while the breathable membrane allows gases to escape and clean air to enter, keeping laundry bottles dimensionally stable and looking pristine on retail shelves from production to consumer use.

Cause

Laundry detergent and fabric softener bottles endure significant internal pressure fluctuations throughout their lifecycle. Many liquid detergents are hot-filled at temperatures up to 60°C; as they cool to ambient, a strong vacuum develops that can cause thin-walled bottles to collapse inward—a phenomenon known as paneling. Conversely, oxygen-based stain removers and color-safe bleaches generate oxygen gas during storage, creating positive pressure that bulges bottles and can cause caps to pop off or leak. Traditional non-breathable induction liners seal the bottle perfectly but trap these pressure differentials, turning the package into a pressure vessel. Consumers perceive deformed bottles as damaged goods, leading to returns, brand erosion, and potential product degradation.

Solution

The PE foam breathable vent liner solves these challenges through intelligent passive ventilation. Its PE foam body provides uniform compression against the bottle neck, forming a reliable seal that accommodates minor surface imperfections. A precisely die-cut window in the liner houses an ePTFE waterproof breathable membrane. When internal pressure rises—whether from gas-generating bleach formulations or thermal expansion—air molecules safely exit through the billions of nanopores in the membrane, preventing bottle deformation. When a vacuum forms after cooling or partial use, ambient air flows back in through the same membrane to equalize pressure, maintaining the bottle's original shape. The membrane is fully waterproof, so even if the bottle is tipped over or stored upside down, no liquid detergent escapes. The liner also functions as a standard induction seal, providing tamper evidence and consumer confidence.

Specifications
Parameter Specification
Product Type PE Foam Breathable Vent Liner
Backing Material PE (Polyethylene) foam, food-grade
Membrane Material ePTFE (oleophobic treated)
Airflow ≥ 300 ml/min @ 1 psi (customizable)
Water Entry Pressure ≥ 60 kPa
Operating Temperature -20°C to +80°C
Seal Type Electromagnetic induction seal
Compatible Bottle Materials HDPE, PET, PP
Tamper Evidence Yes, requires tearing to open
Liner Thickness 0.8mm – 2.0mm (customizable)
Liner Diameter Custom to bottle neck finish
Application
  • Liquid laundry detergent bottles (1L, 2L, 3L)

  • Fabric softener and conditioner bottles

  • Oxygen-based stain remover and color-safe bleach bottles

  • Laundry sanitizer and disinfectant wash containers

  • Hot-fill laundry product packaging

  • Refill pouch neck fitments (integrated into cap)

How It Works

The vent liner is placed inside the cap and induction-sealed onto the bottle neck. The PE foam compresses to fill any gaps between the bottle finish and cap, creating a resilient primary seal. The ePTFE membrane is positioned over a small venting aperture in the liner. When pressure builds inside the bottle, gas molecules flow through the membrane's microscopic pores—large enough for gas, too small for liquid—and escape into the cap headspace, eventually venting through the cap threads. When a vacuum forms, atmospheric air follows the reverse path. The induction seal remains intact and tamper-evident; the consumer peels away the entire liner (including the breathable window) before first use, just like a standard induction liner.

How To Choose
  1. Determine your filling temperature: hot-fill applications demand higher airflow to manage cooling vacuum.

  2. Evaluate your product's gas generation potential: oxygen bleach formulas need higher breathability.

  3. Measure your bottle neck finish precisely: liners are die-cut to match specific neck diameters (e.g., 24/410, 28/410).

  4. Confirm chemical compatibility: test the PE foam and ePTFE membrane with your actual detergent formula, including fragrances and enzymes.

  5. Select foam thickness based on neck flatness: thicker foam compensates for more irregular sealing surfaces.

FAQ
  • Q: Will the detergent leak through the breathable window during shipping?
    A: No, the ePTFE membrane is waterproof up to the rated water entry pressure. Even if the bottle is inverted, no liquid will pass through.

  • Q: Can this liner be used on a standard induction sealing machine?
    A: Yes, it is fully compatible with standard electromagnetic induction sealing equipment. No machine modifications are needed.

  • Q: Is the membrane visible to consumers?
    A: The membrane window is small and positioned within the liner; it is generally not noticeable to consumers. It is removed along with the rest of the liner upon first opening.

  • Q: Does the breathable membrane compromise the tamper-evident feature?
    A: No, the induction seal remains fully intact. Any attempt to access the product requires visibly tearing or removing the liner.

  • Q: Can this liner handle high-viscosity detergents like gel packs or pods outer packaging?
    A: Yes, but ensure the vent window is positioned away from areas where thick product could pool and block airflow. For pods outer containers, pressure equalization prevents crushing of the pods.

Product Highlights

Product Overview The PE foam breathable vent liner is a specialized induction seal liner engineered for laundry detergent and fabric softener bottles. It combines a resilient polyethylene foam backing with a precisely integrated ePTFE waterproof breathable membrane window, providing continuous ...

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