Introduction
If your cap system leaks in transit, shows unstable torque on the filling line, or creates customer complaints from residue around the neck, the root cause is often the sealing structure inside the closure. Supply-Packagings is a direct factory manufacturer and global supplier providing wholesale double-seal plastic screw caps with inner plug and liner options for bottle and jar packaging. With OEM and ODM support, we help you match neck finishes, tune sealing performance, and deliver scalable custom packaging for worldwide distribution.
Product Selling Points
◆ Double-seal structure with inner plug to help reduce leakage and odor escape risk
◆ Ribbed outer wall for better grip and more stable capping torque
◆ Compatible with a wide range of bottle and jar neck finishes with fit verification
◆ OEM and ODM customization for color, dimensions, plug geometry, and liner selection
◆ Factory-direct wholesale capacity with dimensional QC for repeat orders
◆ Supports multi-format sourcing across packaging categories including bottle, jar, and pouch programs
Product Overview
Double-Seal Screw Caps for High-Reliability Closure Systems
These plastic screw caps are designed with an internal sealing concept that may include an inner plug and/or liner to enhance sealing performance compared with standard caps. The structure is suitable for products where transport vibration, temperature change, and repeated opening can create leakage or messy neck finishes.
Supply-Packagings can supply closures as standalone components or as part of a complete custom packaging system with matched bottles, jars, pumps, and secondary packaging.
Product Features
Improved sealing architecture
The inner plug and liner interface may help stabilize sealing under vibration and reduce cap loosening complaints when correctly matched to the bottle finish.
Better user handling
Ribbed sides support secure grip and consistent opening feel, especially for larger diameter caps.
Color coding for SKU management
Multiple colors are available to support production identification, formula mapping, or regional variants.
Structure and Functional Design
Outer cap shell
▪ Material options typically include PP or HDPE based on project needs
▪ Ribbed profile supports torque control for manual and machine application
▪ Smooth top area can be customized for branding or surface finish preferences
Inner plug
▪ Plug geometry can be designed to match your bottle/jar mouth and sealing land
▪ Retention features can be tuned to reduce plug loosening during transport and repeated use
▪ Plug design can be optimized to reduce residue build-up around the neck in some applications
Liner options
◈ Common liner configurations include
- EPE foam liner
- PE liner
- Pressure-sensitive liner
- Induction seal compatibility options upon request
Liner selection may help improve sealing stability depending on your formula type and distribution conditions.
Detailed Product Description
Supply-Packagings produces double-seal caps for B2B buyers who need reliable closure performance and stable bulk supply. Many issues seen in export markets are caused by small tolerance drift between caps and bottles, incorrect liner selection, or caps sourced separately from the container supplier—leading to cross-threading, torque variation, and leakage claims.
As an OEM/ODM-capable manufacturer, we support a fit-first workflow: confirm your neck finish, validate cap engagement and plug seating using samples, recommend liner options, and deliver wholesale production with export-oriented packing. If you want to consolidate sourcing, we can also supply matched bottle and jar packaging and flexible pouch options for refill programs.
Functional Structure Explanation
How the double-seal system works
• The screw thread provides mechanical retention and torque control
• The inner plug provides a secondary sealing interface at the mouth/land area
• The liner adds an additional sealing layer and may improve tolerance absorption
• Combined, these elements can help reduce leakage risk compared with single-seal caps, depending on product and transport conditions
Fit verification workflow
◆ Share your neck finish drawing or send bottle/jar samples
◆ Confirm cap thread engagement and plug seating depth
◆ Sample testing for torque feel, leakage check, and repeated open-close performance
◆ Pre-production approval before mass manufacturing
Specifications
| Item | Options |
|---|---|
| Product Type | Double-Seal Plastic Screw Cap with Inner Plug |
| Material | PP, HDPE, custom by project |
| Color | Light blue shown, yellow/white/custom Pantone available |
| Diameter | Custom (matched to your bottle/jar finish) |
| Thread Type | Continuous thread, matched to neck finish |
| Sealing | Inner plug + optional liner |
| Liner | EPE, PE, pressure-sensitive, induction compatible options |
| Branding | Deboss, emboss, or printing options by project |
| Order Type | OEM, ODM, wholesale |
| Application | Bottle packaging, jar packaging, closure systems |
Suitable Industries
▪ Daily chemical packaging for liquids that require stronger sealing control
▪ Supplement packaging for jars and bottles requiring stable closure performance
▪ Cosmetic packaging for creams, gels, and specialty products
▪ Food-grade applications where appropriate material/coating selections are confirmed
▪ Industrial and automotive liquids requiring controlled sealing designs
Application Scenarios
◆ Large-diameter caps for wide-mouth bottles and jars
◆ Export shipments where vibration and stacking can loosen standard caps
◆ Multi-SKU programs using color-coded caps for production control
◆ E-commerce distribution requiring improved leak-risk management
◆ Consolidated sourcing projects combining closures with bottle, jar, and refill pouch packaging
Customer Pain Points and Solutions
Pain point
Leakage or seepage during long-distance shipping
Solution
We supply matched cap + inner plug structures, verify fit with your bottle finish, and recommend liner options to improve sealing stability.
Pain point
Residue and messy neck finishes after repeated use
Solution
Plug geometry and liner selection can be tuned to your product type to help reduce residue migration and improve user experience.
Pain point
Cross-threading and torque variation on capping lines
Solution
We control critical thread tolerances and support sample-based torque verification to align with your manual or automated capping method.
Pain point
Too many vendors for caps, bottles, jars, and refills
Solution
As a global supplier and direct factory manufacturer, we can bundle closures with matched containers and support flexible pouch packaging to reduce procurement steps.
Product Advantages
◆ Direct factory manufacturing with traceable QC checkpoints
◆ OEM and ODM capability for plug geometry, thread matching, and liner selection
◆ Stable manufacturer capacity for repeat wholesale orders
◆ Export-oriented packing standards to protect threads and sealing surfaces
◆ Broad packaging portfolio for consolidated custom packaging development
Packaging and Logistics
▪ Caps and plugs can be packed assembled or separated based on your filling process
▪ PE bagging and labeled cartons to reduce contamination and SKU mix-ups
▪ Palletization available for bulk wholesale shipments
▪ Samples via express courier; mass orders via sea or air freight
▪ Mixed loading supported with bottles, jars, paper boxes, and other packaging components
FAQ
Are you a factory or a trading company
We are a packaging manufacturer and direct factory supplier supporting OEM, ODM, and wholesale export orders.
Can you match this cap to our existing bottle or jar
Yes. Send your neck finish drawing or physical samples. We will verify thread engagement and plug seating and propose the correct configuration.
What is the benefit of an inner plug
An inner plug adds a secondary sealing interface at the mouth/land area, which may help reduce leakage and improve closure stability when correctly matched.
Which liner should we choose
Liner choice depends on your product characteristics and logistics conditions. We can propose EPE, pressure-sensitive, or induction compatible options and confirm by samples.
Can you do custom colors
Yes. We support Pantone color matching for custom packaging programs, including cap and plug components.
What is your MOQ and lead time
MOQ and lead time depend on size, material, color, liner, and whether new tooling is required. We quote after confirming your specification.
Can you supply matching bottles or jars
Yes. We can supply complete bottle and jar packaging solutions, and also support pouch packaging for refills or line extensions.
Customer Reviews
“Fit verification and the double-seal structure helped us reduce leakage complaints in international distribution.”
Quality Manager, Packaging Distributor
“Color consistency and packing quality were stable across repeat wholesale orders.”
Procurement Lead, Contract Filler
Related Products
◆ Plastic screw caps without inner plug
◆ Orifice reducer inserts and valve plugs for dispensing closures
◆ HDPE and PET bottles for daily chemical and supplement packaging
◆ Plastic jars for cosmetic and supplement packaging
◆ Flexible pouch packaging for refill programs
◆ Paper boxes for secondary packaging and retail sets
Complete Packaging Development Support
Visit our products page for complete packaging development support.
Contact Us
Contact Us to share your bottle or jar samples, target sealing requirements, and estimated wholesale volume. We will propose an OEM/ODM double-seal screw cap solution with factory-direct production and global export support.
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