The function and application of PE foam liner
PE foam liner is one of the most widely used lining materials in the field of bottle cap sealing. It uses polyethylene (PE) as the substrate and is made into a three-layer composite structure through physical foaming technology, achieving functions such as repeated sealing, buffering, and leakage prevention.
1、 Get to know PE foam liners
PE foam liner is a sealing liner for bottle cap inner lining made of polyethylene as raw material and with a closed cell structure through foaming process. The typical structure is a three-layer composite: the upper and lower layers are high-density polyethylene (HDPE) surface layers, and the middle layer is a low foaming PE elastomer layer. The three layers are integrated through thermal composite technology.
2、 The core function of PE foam liner
2.1 Physical sealing function
PE foam liner rely on the elastic compression of the material to achieve sealing. When the bottle cap is tightened, the liner is compressed on the end face of the bottle mouth, and the foam layer undergoes elastic deformation, filling the uneven surface of the bottle mouth and forming a reliable physical seal.
Features: No need for induction sealing equipment, sealing with a screw cap, simple operation, low threshold for equipment.
2.2 Repeatable sealing function
Once the aluminum foil induction liner is opened, it will be destroyed, while the PE foam liner will remain in the cap after the cap is unscrewed, and the sealing effect can still be restored by screwing it again - this is crucial for products that need to be taken for many times (such as face cream and condiments).
User experience value: After each use, when consumers tighten the bottle cap, the liner can still provide reliable sealing protection, and the contents are not easily dried or leaked.
2.3 Buffer protection function
The foam layer has good elasticity and cushioning properties, which can absorb impacts and vibrations during transportation and handling, protecting the bottle mouth area from damage.
Practical significance: Reduce transportation damage rate and minimize returns and customer complaints caused by packaging damage.
2.4 Leak proof and anti-seepage function
The closed cell foam structure provides good barrier properties for PE foam liner, effectively preventing leakage or evaporation of liquid contents. This function is particularly critical for liquid products such as sauces, oils, detergents, etc.
2.5 Security Protection Function
The PE foam liner itself is non-toxic, odorless, chemically stable, and will not contaminate the contents. Although it does not have the anti-theft function of "one-time opening" of aluminum foil induction liner, it provides chemical safety protection for products that do not require tamper proof packaging - it does not react with the contents and does not release harmful substances.
3、 Main application areas
3.1 Cosmetics Industry
Core requirements: Moisturizing cream, anti drying and anti caking, sealing even after multiple opening and closing, non stick material
Application products:
Specific product examples for segmented categories
Cream face cream, eye cream, hand cream, body cream
Washing shampoo, shower gel, facial cleanser
Make up liquid foundation, concealer, and makeup front milk
Skin care essence, lotion, sunscreen
Why choose PE foam: Smooth surface, non stick paste, reusable sealing to keep the paste moist, white appearance to enhance product grade.
3.2 Food Industry
Core requirements: Food contact safety, oil leakage prevention, moisture resistance, no odor
Application products:
Specific product examples for segmented categories
Seasoning soy sauce, oyster sauce, edible oil, vinegar, honey
Sauce type tomato sauce, salad dressing, peanut butter, jam
Beverages such as fruit juice, tea drinks, and functional drinks
Health food protein powder, vitamin tablets, probiotic powder
Why choose PE foam: Food grade material certification (FDA/SGS), oil resistance and non leakage, odorless and non cross flavored.
3.3 Pharmaceutical Industry
Core requirements: Non toxic and odorless, chemically stable, and compliant with pharmaceutical packaging material standards
Application products:
Specific product examples for segmented categories
Oral medication pills, capsules, granules
Ointment, cream and gel for external use
Health supplements, nutritional supplements, vitamins
Attention: If tamper proof function is required for drug packaging, an aluminum foil induction liner should be stacked on top of the PE foam liner or a two-layer structure should be used.
3.4 Daily Chemical and Home Furnishing Industry
Core requirements: resistant to chemical corrosion, leak proof, adaptable to different contents
Application products:
Specific product examples for segmented categories
Cleaning supplies: laundry detergent, dishwashing liquid, toilet cleaner, disinfectant
Personal care mouthwash, hand sanitizer, shaving cream
Home fragrances, liquid fragrances, deodorizers
Why choose PE foaming: acid and alkali resistance, alcohol solvent resistance, stable sealing performance.
3.5 Industrial and Chemical Industries
Core requirements: resistant to chemical media, reliable sealing, and adaptable to transportation environments
Application products:
Specific product examples for segmented categories
Lubricating oil, gear oil, hydraulic oil
Pesticides, insecticides, herbicides, fungicides
Chemical industry solvents, adhesives, coatings
Why choose PE foam: oil resistant, chemical resistant, can be combined with breathable film to prevent bottle swelling.
4、 Technical parameter reference
Typical range of parameter items
Thickness 0.5mm -3.5mm
Diameter 10mm -180mm
Density 0.3-0.6 g/cm³
Compression ratio 15% -25%
Rebound rate ≥ 90%
Applicable temperature -30 ℃ -70 ℃
Suitable for bottle mouth materials such as PE, PP, PET, PS, glass, etc
Food Contact Certification FDA 21 CFR 177.1520, EU 10/2011
Environmental compliance RoHS, REACH
4、 Summary
The core value of PE foam liner lies in providing reliable physical sealing with the lowest equipment threshold and most stable material supply in scenarios where airtight sealing is not required.
It does not leak, does not contaminate the contents, and can be covered and reused after use - these are the reasons why it is widely used in cosmetics, food, daily chemical, and chemical industries. Aluminum foil induction liner solve the problem of "absolute safety+anti-theft", while PE foam liner solve the problem of "daily usability+affordability".
About BAIJUR
Zhongshan Baiju New Materials Co., Ltd. specializes in the research and development, production, and sales of sealing liner and rolls. It integrates four major workshops: composite aluminum foil, PE foam, film coating, and die-cutting, providing one-stop customized services from raw materials to finished products. The product has passed authoritative certifications such as ISO9001, FDA, SGS, ROHS, etc. Welcome to customize samples or consult technical solutions.
