Cart(Features: Pull to open, easy to use, thick inner pad, good sealing. Gaskets are odorless and defect-free. The top pattern is clearly printed and the workmanship is meticulous
28mm standard PE plastic bottle caps
Functional requirements of plastic anti-theft bottle caps
①The functions of plastic anti-theft bottle caps (hereinafter referred to as: plastic bottle caps) mainly include the following two points:
A. Airtightness, which protects the contents, which is the basic function of the bottle cap;
B. Aesthetics, as an inseparable part of the packaging, the small caps play a finishing touch.
②For different beverage products, they have some common needs for bottle caps, such as: sealing/resealing: good sealing; marketing support: easy to use; promotion: diversified economy: competitive price Anti-theft function: prevent Tamper or counterfeit closures: high efficiency, high productivity Safety: food grade, no contamination
Bottle cap sealing structure design:
① 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.(NO.1 PICTURE)
② Sealing principle: After capping, the sealing ring goes deep into the bottle mouth
Inside, there are serrated annular protrusions on the outside of the sealing ring, so that the
The sealing ring is in close contact with the bottle mouth. The top sealing ring is pressed on the bottle mouth on flat surface. The side sealing ring surrounds the outside of the top of the bottle mouth. secret
The seal ring plays the role of the main seal; the top seal ring and the side seal ring play the role of the main seal;
Auxiliary sealing action
③Description: The three-way sealing structure design ensures that the beverage is squeezed and collided during handling or transportation without leakage and deterioration.
| Name of the product | plastic caps | Material | plastic | |
| Internal dimensions | (±0.15mm) | Type of printing | Customize colors | |
| External dimensions | (±0.30mm) | Packaging | White poly bag , then packed in carton . | |
| Usage | Bottles.Water.Juice,soft drink | Feature | Non Spill | |
| Customized Order | Accept | Place of Origin: | Shandong,China | |
| Brand Name | Wonderfly | Model Number | WDF-07 | |
| Color | Customized | Size | Customized | |
| Application | Bottle usage | MOQ | Pure color:100,000pcsCustom logo:300,000pcs | |
| Logo | Custom logo | Sample | provided | |
| Packaging&delivery | Packaging Detail.10,000 pcs /carton . First , white poly bag ,then packed in carton . | |||
| Port | Qingdao,Tianjin | |||
| Quantity(pieces) | 1 - 100000 | >100000 |
| Est. time (days) | 7 | To be negotiated |
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
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
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.
Features: Pull to open, easy to use, thick inner pad, good sealing. Gaskets are odorless and defect-free. The top pattern is clearly printed and the workmanship is meticulous
Features: Pull to open, easy to use, thick inner pad, good sealing. Gaskets are odorless and defect-free. The top pattern is clearly printed and the workmanship is meticulous
Features: Pull to open, easy to use, thick inner pad, good sealing. Gaskets are odorless and defect-free. The top pattern is clearly printed and the workmanship is meticulous.
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.
