28mm plastic water soda bottle caps
Product Name: Beverage Flat Top Cap (Plastic Threaded Flat Cap)
Scope of Application: Sealing PET / Plastic / Glass Beverage Bottles for Mineral Water, Purified Water, Fruit Juices, Tea Drinks, Functional Beverages, Dairy Products, and Low-Alcohol Beverages
Execution Standard: GB 4806.7-2016 Plastic Materials and Articles for Food Contact, Enterprise Food Packaging Standard
Structural features: Flat top cover + threaded engagement + built-in sealing mechanism, no flip cover or hinge, simple and durable, can be manually rotated to open/tighten, supports repeated sealing, compatible with high-speed filling lines.
Product Name: Beverage Flat-Top Cap (Plastic Threaded Flat Cap)
Scope of Application: Sealing PET / Plastic / Glass Beverage Bottles for Mineral Water, Purified Water, Fruit Juices, Tea Drinks, Functional Beverages, Dairy Products, and Low-Alcohol Beverages
Execution Standard: GB 4806.7-2016 Plastic Materials and Articles in Contact with Food - Enterprise Food Packaging Standard
Structural features: flat top cover + threaded engagement + built-in sealing mechanism, no flip cover or hinge, simple and durable, can be manually twisted open/locked, supports repeated sealing, compatible with high-speed filling lines.
| Item | Standard Parameter | Remarks |
|---|---|---|
| Common Calibers | 28mm PCO 1881/1880, 30mm, 38mm, 48mm | Mainstream sizes for beverage industry |
| Material | Food-grade PP / HDPE | High temperature resistance, impact resistance, odor-free |
| Cap Surface Style | Smooth flat surface (printable) | Support custom LOGO & patterns |
| Sealing Structure | Top sealing / Built-in sealing gasket | Leak-proof, aroma-locking and oxygen barrier |
| Temperature Resistance Range | -10℃ ~ 110℃ | Suitable for cold filling, hot filling and pasteurization |
| Dimensional Tolerance | ±0.1mm | Compatible with automatic capping machines |
| Single Cap Weight | 2.0g ~ 5.0g | Varies by caliber and wall thickness |
| Sealing Performance | No liquid leakage after 24h inversion & vibration test | Safe for transportation |
Flat Top Cover: Smooth and clean surface, easy for printing, labeling and stacking with premium appearance.
Threaded Teeth: Precisely molded for smooth screwing with stable torque, no damage to bottle mouths.
Sealing Ring / Sealing Gasket: Compression top sealing design to prevent leakage, volatilization and maintain freshness & carbonation.
Anti-slip Ribs: Vertical or grid lines on side wall for easy twisting even with wet hands.
Reinforcement Ribs: Enhance cap strength to avoid cracking and deformation during capping.
PP (Polypropylene)
High temperature resistance, high rigidity and anti-collision performance
Suitable for hot filling, pasteurization and carbonated drinks
Food-grade, odorless and recyclable
HDPE (High Density Polyethylene)
High toughness, low temperature resistance and resistance to stress cracking
Suitable for cold filling, drinking water, fruit juice and dairy products
Cost-effective with stable sealing performance
Optional Sealing Gaskets
EVA Gasket: General type with soft sealing for non-carbonated drinks
PE Sealing Gasket: High barrier performance for aroma retention, ideal for fruit juice & tea drinks
Integrated gasket-free sealing: Lightweight design preferred by high-speed filling lines, widely used for mineral water
Leakproof Sealing: Top sealing structure matched with precise threads ensures zero leakage during inversion, transportation and vibration.
Smooth Screwing: High precision threads prevent slipping or jamming with stable capping torque.
Wide Temperature Adaptability: Works well in cold filling, hot filling, cold chain storage and short-time sterilization.
High-Speed Line Compatibility: Stable dimensions avoid cap jamming, falling off and bottle scratching.
Food Safety: Free of plasticizers, heavy metals and peculiar odors, fully compliant with food contact standards.
Reusable Sealing: Can be twisted open and tightened repeatedly for portable separate drinking.
Anti-Aging Performance: No brittleness or deformation within 12 months when stored indoors away from light.
By Caliber
Small mouth: 28mm (mainstream for mineral water & beverages), 30mm (dairy & premium water)
Medium mouth: 38mm (1L–2L large bottle fruit juice & drinks)
Large mouth: 48mm and above (large-capacity drinking water & fruit beverages)
By Sealing Method
Integrated gasket-free flat screw cap (lightweight, for high-speed filling lines)
Gasket-equipped flat screw cap (high sealing & aroma retention)
By Filling Process
Cold filling flat screw cap (drinking water, fruit juice)
Hot filling flat screw cap (tea drinks, hot fruit juice)
Pressure-resistant flat screw cap (carbonated drinks & aerated beverages)
Bottled mineral water & purified water
Fruit juice, tea drinks, coffee & plant protein beverages
Energy drinks & electrolyte water
Dairy & lactic acid bacteria drinks
Low-alcohol rice wine & fruit wine
Reusable portable packaging
Color Customization: White, blue, red, green, black, transparent; Pantone color matching available
Printing Customization: Silk screen & pad printing on cap top for LOGO, brand slogans and production dates
Structural Customization: Thicken / lighten wall, adjust torque and strengthen sealing structure
Gasket Customization: Optional EVA / PE / silicone gaskets
Packaging Customization: Bag & carton packaging with custom shipping marks on outer boxes
Factory Inspection Items: Dimension, capping torque, sealing performance, heat resistance, appearance, food substance migration test
Available Certificates: SC food production qualification, SGS test report, FDA, LFGB, factory quality inspection certificate
Q1: What is the difference between flat screw caps and flip caps?
A1: Flat screw caps have no hinges or flip lids, featuring simpler structure, better sanitation, lower cost and wider printing area, perfectly matching high-speed filling lines with reusable sealing function.
Q2: Are 28mm PCO 1880 and 1881 interchangeable?
A2: Yes. Model 1881 is lightweight for plain drinking water; Model 1880 has thicker wall for beverages with slight internal pressure.
Q3: Can flat screw caps be used for carbonated drinks?
A3: Yes. Select thickened PP pressure-resistant flat screw caps, which can bear carbonation pressure without cap bulging or air leakage.
Q4: Is this cap suitable for hot filling?
A4: Yes. PP material withstands up to 110℃, suitable for 85–95℃ hot filling of fruit juice and tea drinks without deformation or leakage.
Q5: What causes loose twisting or liquid leakage?
A5: Common reasons include improper capping torque, non-standard bottle mouths, offset gaskets or deformed caps. All our products pass 100% factory inspection with qualified sealing performance under normal use.
Q6: Can you provide free samples?
A6: Free samples are available, buyers only need to cover courier fees for dimension, screwing, sealing and printing tests.
Q7: What is the production lead time?
A7: In-stock blank caps: 3–7 working days; custom printed caps: 10–15 working days after artwork confirmation.
Q8: Can flat screw caps be reused multiple times?
A8: Yes. They can be tightened and twisted open repeatedly, ideal for separate drinking and outdoor carrying.
| 1. Polyethylene (PE) - Types: Mainly HDPE (High-Density Polyethylene) and LDPE (Low-Density Polyethylene). - Characteristics: - Good chemical resistance and impact strength. - HDPE offers higher rigidity, while LDPE provides better flexibility. - Cost-effective and widely used for water and beverage bottles. - Applications: Common in milk jugs, water bottles, and non-carbonated drink caps. | 2. Polypropylene (PP) - Characteristics: - Excellent heat resistance (suitable for hot-fill liquids). - Good fatigue resistance, making it ideal for twist-off caps. - Higher rigidity than PE but less flexible. - Applications: Widely used in juice bottles, condiment caps, and pharmaceutical packaging. |
3. Polyethylene Terephthalate (PET) - Characteristics: - High clarity and good barrier properties against CO₂. - Lightweight but less impact-resistant than PE or PP. - Applications: Often used for carbonated beverage caps due to its gas barrier performance. | 4. Other Specialty Materials - Polystyrene (PS): Occasionally used for rigid caps but less common due to brittleness. - Biodegradable Plastics (PLA, PHA): Emerging in eco-friendly packaging but limited in anti-theft cap applications due to cost and performance constraints. |
Key Considerations for Material Selection: - Barrier Properties (O₂/CO₂ resistance for beverages). - Mechanical Strength (Impact resistance, torque resistance). - Processing Compatibility (Injection molding efficiency). - Sustainability (Recyclability or bio-based alternatives). | |
Conclusion: HDPE and PP dominate the anti-theft cap market due to their balance of performance and cost, while PET is preferred for carbonated drinks. Emerging biodegradable materials face challenges but align with green packaging trends. | |
The functions of plastic anti-theft bottle caps...
Tamper evident cap is specifically designed for essential oil glass bottles with an 18 DIN neck finish. It is designed for the euro dropper bottle for essential oil perfume packing.
Airtightness, which protects the contents, which is the basic function of the bottle cap;
Sealing structure: no gasket cover from inside to top to there are three external sealing structures, which are the sealing ring, the top sealing ring and the side sealing ring.
Cover surface: full molding, complete structure, no material shortage, no obvious damage, burrs and deformation;
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