Product Overview
Inner Plug Bottle Cap is an inner plug combination cap designed for liquid food bottles, oil bottles, sauce bottles, and plastic containers. It helps improve bottle neck sealing, leakage prevention, flow control, and repeated opening performance.
Technical Specifications
|
Item |
Parameter |
|
Material |
PP / PE / LDPE |
|
Structure Type |
Inner plug combination cap / Plug-in Cap / Inner Plug Closure |
|
Application Range |
PET bottles, PE bottles, oil bottles, condiment bottles, food containers |
|
Sealing Method |
Inner plug seal, plug-in seal, threaded outer cap seal, combined seal |
|
Size Range |
Fits 20–48 mm necks; inner plug OD approx. 18–45 mm |
|
insertion depth |
Approx. 6–28 mm, confirmed by bottle neck structure |
|
Product Weight |
Approx. 1.5–9 g |
|
Color Options |
White, natural, yellow, green, brown; customization supported |
|
MOQ |
100,000 pcs |
Key Features
The inner plug fits against the inside wall of the bottle neck to improve sealing, while the outer cap can be designed to work with it as one complete closure. Small flow-control holes, pourer outlets, or pull-open structures can be added depending on how the product needs to be poured or opened. The insertion depth can be adjusted according to the bottle neck height, sealing position, and contents, making it suitable for edible oil, sauces, and other liquid food containers.
Applications
- Edible oil bottle inner plug caps
- Condiment bottle sealing caps
- Sauce bottle inner plug caps
- Plastic container leak-prevention packaging
- PET bottle neck sealing matching
- OEM bottle cap development
OEM / Customization Capabilities
- Size customization: Outer diameter, height, insertion depth, sealing rib size, and pull-out structure can be adjusted according to the bottle neck inner diameter.
- Structure adjustment: Flat plugs, pull-ring plugs, inner plugs, sealing plugs, or plugs with pourer structures can be developed.
- LOGO embossing / printing: Top or outer-side embossing, embossed/debossed marks, and simple symbols are supported.
- Color customization: White, natural, black, and brand colors can be customized.
- Mold development: Molds can be developed according to bottle neck samples, sealing surfaces, and insertion-force requirements.
- Sample confirmation: Insertion tightness, sealing effect, and pull-out feel can be confirmed first.
QC Process
- Raw material inspection
- Injection molding inspection
- Telescoping structure inspection
- Pour spout assembly inspection
- Dimensional sampling inspection
- Seal-fit inspection
- Appearance sorting
- Packaging inspection
- Pre-shipment confirmation
Production Capacity and Lead Tim
- Monthly capacity approx 3,000,000 pcs.
- Average lead time for standard products approx. 30 days.
- Average lead time for custom products approx. 60 days.
- Lead time for new mold projects depends on structural complexity, mold trial progress, and sample approval time.
Quality Control
Inner Plug Bottle Cap is manufactured and inspected before shipment according to approved samples, customer drawings, and inner plug cap outgoing inspection requirements. Key inspection items include inner plug outer diameter, insertion depth, sealing performance, outer cap fit, insertion feel, and appearance consistency. Third-party inspection is accepted, and production photos or videos can be provided during manufacturing.
Frequently Asked Questions
1. How is the inner plug outer diameter confirmed?
-
Please provide bottle neck inner diameter, sealing position, and bottle samples.
2. Can insertion tightness be adjusted?
-
Insertion tightness can be adjusted through sealing rib dimensions and material elasticity.
3. Can it be used with a flip-top cap?
-
Yes. Inner plug height and internal flip-top space need to be confirmed.
4. Can a flow-control hole be added?
-
Yes. Flow-control hole size should be tested according to product content and pouring method.
5. Is it suitable for oil bottles?
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