Custom Diameter & Thickness EPE Foam + Wool Felt Venting Liner for Non-Perforated Screw Caps

The XINXIA EPE Foam + Wool Felt Venting Liner is a specially designed breathable closure liner that enables gas exchange without requiring additional vent holes in compatible screw caps.

Unlike conventional venting solutions that require perforated bottle caps, this composite venting liner is designed to utilize the clearance between the bottle cap and its threads as a gas release pathway.

The liner combines a breathable wool felt layer, approximately 0.25 mm thick, with a lightweight EPE foam substrate. Its composite structure provides cushioning, sealing contact, and a controlled pathway for gas exchange.

Both the liner diameter and overall thickness can be customized to accommodate different bottle neck sizes, cap designs, and packaging requirements.

This product is particularly suitable for manufacturers seeking to integrate a venting function into existing threaded packaging systems while minimizing additional cap modification.

Key Advantage: No Cap Drilling Required – Venting Through Cap Threads.

The final venting performance depends on the cap geometry, thread clearance, liner configuration, and packaged product.

In certain packaging applications, internal pressure may change during storage, transportation, or product handling.

Pressure fluctuations can result from several factors:

• Gas generation associated with the packaged formulation.

• Changes in ambient temperature.

• Changes in atmospheric pressure during transportation.

• Expansion or contraction of gas inside the container.

• Pressure differences between the container interior and the surrounding environment.

When pressure differences become excessive, packaging may experience unwanted deformation, cap stress, leakage, or other performance problems.

Traditional venting solutions often require an additional hole to be drilled or molded into the bottle cap, allowing gas to pass through a breathable membrane or venting component.

However, additional cap perforation may increase manufacturing complexity and require changes to existing closure designs.

For packaging manufacturers seeking a simpler venting configuration, a liner that supports gas exchange through the existing threaded closure structure can provide an alternative solution.

The XINXIA EPE Foam + Wool Felt Venting Liner is developed for applications where gas exchange can be achieved without drilling additional holes in the bottle cap.

Its composite structure combines breathable felt with an EPE foam support layer.

When installed inside a compatible screw cap, the liner provides a designed gas passage that allows gas to move from the container interior toward the closure's threaded region.

The gas can then escape through available clearance along the cap threads.

This design offers several practical advantages:

1. No Additional Cap Drilling

Compatible screw caps can be used without adding separate vent holes.

2. Simplified Closure Integration

The venting function can be incorporated through a specially configured liner, potentially reducing the need for additional cap-processing operations.

3. Customizable Dimensions

The liner diameter, total thickness, and vent-opening configuration can be adjusted to match specific packaging requirements.

4. Composite Material Structure

The breathable felt layer supports gas passage, while the EPE foam provides a lightweight and compressible supporting structure.

5. Compatibility-Oriented Design

The liner can be developed for a range of threaded closure configurations, subject to dimensional and performance verification.

Note: Product dimensions, material structure, gas flow rate, pressure resistance, and closure compatibility should be confirmed based on actual application requirements and testing.

The EPE Foam + Wool Felt Venting Liner can be evaluated for various packaging applications where pressure equalization or gas exchange is required.

Suitable for evaluation in selected chemical packaging systems where the packaged formulation may generate gas or experience internal pressure changes.

Can be considered for compatible agricultural chemical containers requiring a controlled gas exchange solution.

Applicable to selected household and industrial cleaning product packaging where pressure management is necessary.

May be incorporated into suitable threaded containers used for industrial liquids and specialty formulations.

The liner can also be customized for other applications requiring a combination of cushioning, closure contact, and gas venting.

Important: Material compatibility, leakage prevention, chemical resistance, and venting performance must be evaluated for each specific product and closure combination.

The XINXIA composite venting liner operates through a combination of the liner's internal gas passage and the available clearance in the threaded closure.

Step 1: Internal Pressure Development

Gas or pressure differences develop inside the sealed container during storage, transportation, or product use.

Step 2: Gas Enters the Venting Liner

Gas reaches the designated venting area of the composite liner through its configured internal passage.

Step 3: Gas Passes Through the Felt Structure

The breathable wool felt and designed vent opening allow gas to move toward the space inside the bottle cap.

Step 4: Gas Moves Along the Cap Threads

Gas enters the available clearance between the cap and bottle neck threads.

Step 5: Pressure Equalization

Gas is discharged through the threaded pathway, helping reduce pressure differences between the container interior and surrounding environment.

This venting principle enables compatible screw caps to support gas exchange without requiring an additional perforation in the cap itself.

The actual gas flow pathway must remain open after the cap is tightened.

Selecting a suitable venting liner requires consideration of both the liner design and the complete packaging system.

Provide the cap inner diameter, bottle neck dimensions, and closure specifications to ensure an appropriate fit.

The overall liner thickness should be selected according to cap compression, bottle neck geometry, and sealing requirements.

Share the expected internal pressure conditions and required gas flow performance.

Because this design uses the clearance along the cap threads, the closure must provide an unobstructed gas discharge pathway.

The EPE foam, felt, and any additional components must be compatible with the packaged formulation.

Samples should be tested under actual filling, capping, storage, and transportation conditions before mass production.

XINXIA NEW MATERIAL can assist customers in evaluating customized liner dimensions and structural configurations for their packaging projects.

A: No additional cap perforation is required when the liner is used with a compatible threaded closure that provides a suitable gas release pathway. The venting function is achieved through the liner structure and the clearance along the cap threads.

A: Yes. XINXIA NEW MATERIAL offers customized liner diameters and overall thicknesses according to customers' bottle cap dimensions and application requirements. The wool felt layer is approximately 0.25 mm thick in the referenced configuration.

A: It may be suitable for certain standard screw caps without additional drilling. However, the cap thread geometry, liner compression, and available venting clearance must be evaluated before confirming compatibility.

A: The liner can be evaluated for selected chemical packaging applications. Suitability depends on the chemical formulation, material compatibility, pressure conditions, and required leakage resistance. Application-specific testing is recommended.

A: Please provide your required liner diameter, thickness, bottle cap dimensions, packaged product information, and expected venting performance. Our technical team can review the requirements and discuss a suitable sample configuration.

Looking for a venting liner that works without additional cap drilling?

XINXIA NEW MATERIAL provides customized EPE foam and breathable felt composite liners for industrial and specialty packaging applications.

Contact us to discuss your bottle cap design, material requirements, and customized liner dimensions.

Website: www.xinxia-package.com

Email: xinxiatrade@vip.163.com

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