I. Basic Definition and Industry Positioning of 2925 Cap
1.1 Core Naming and Basic Concepts
What is a 2925 cap? What are the specifications of 2925 cap?
The 2925 cap is a mainstream one-piece plastic tamper-evident screw cap on the market. Its naming core originates from the industry's general standard size specification, i.e., it is adapted to beverage packaging bottles with a bottleneck outer diameter of 29mm and a bottleneck thread diameter of 25mm. It is also commonly known as the "Xiaokang Kou Cap" in the industry. This common name comes from the fact that leading Chinese beverage brands such as Master Kong and Ganten took the lead in large-scale application of this specification cap, which also promoted this model to become a general mainstream model in the industry.
The official category attribute of this cap is "special plastic tamper-evident cap for non-carbonated beverages", which corely adapts to the packaging needs of non-carbonated beverages. The entire process of product production, inspection, and factory delivery is strictly implemented in accordance with the national mandatory standard GB/T17876-2010 "Packaging Containers - Plastic Tamper-Evident Caps", without any non-standard design or process adjustment, and fully meets the industry compliance requirements for food packaging.
1.2 Core Classification and Industry Value
Divided from the perspective of product structure and process, the 2925 cap belongs to a linerless one-piece screw cap, which is manufactured by a one-time integral molding process. Different from the two-piece cap with an inner liner, it has significant advantages in production efficiency and material cost. Divided from the application attribute, it is a special cap for cold-filled beverages, which cannot be adapted to the packaging of beverages with hot-filling process, and is a core supporting product for the lightweight packaging upgrade in the bottled water field.
In the development process of the beverage packaging industry, the 2925 cap is a core product undertaking the lightweight upgrade of the traditional 3025 cap. It not only meets the core demand of beverage enterprises for cost reduction and efficiency improvement, but also conforms to the national policy orientation of plastic reduction, lightweight, and green environmental protection for food packaging. It is an important carrier for the beverage industry to transform from "heavy packaging" to "light compliance", and its market recognition and application popularity have been steadily increasing year by year.
II. Core Technical Parameters and Specification Standards (Original Parameters Fully Retained, No Fabrication)
2.1 Core Physical Specification Parameter Table
|
Parameter Item |
Standard Design Value |
Corresponding Tolerance Requirement of National Standard |
Core Significance of Parameter |
|
Adapted bottleneck Specification |
Outer diameter 29mm, thread diameter 25mm |
Complies with the bottleneck adaptation standard in Appendix A of the national standard |
Industry-general adaptation size, no compatibility deviation |
|
Cap Product Type |
One-piece cold-fill cap with tamper-evident band |
Mandatory requirement for tamper-evident band in National Standard 3.4 |
The tamper-evident band breaks irreversibly after opening, with anti-counterfeiting property |
|
Number of knurl |
72 teeth |
No explicit quantity requirement |
Improves the friction force of hand grip and ensures opening convenience |
|
Standard Weight of Finished Product |
Regular version: 1.25-1.30g, heightened version: 1.5g |
No mandatory weight requirement |
Lightweight design reduces the comprehensive cost of raw materials and logistics |
|
Maximum Outer Diameter of Cap (M) |
29.0mm |
MT6a, allowable deviation ±0.70mm |
Determines the bottleneck adaptability, requiring measurement with precision tools |
|
Overall Height of Cap (H) |
11.0mm (≤12mm) |
MT6b, allowable deviation ±0.90mm |
Related to the standard range of opening torque in the national standard, a core parameter for adaptability |
|
Thread Major Diameter (E) |
25.0mm |
MT6a, allowable deviation ±0.70mm |
Precisely meshes with the bottleneck thread, a core guarantee for sealing |
|
Outer Diameter of Inner Plug (P) |
22.5mm |
MT6a, allowable deviation ±0.70mm |
Core size of the double-layer sealing structure, a key indicator for leak prevention |
2.2 Core Physical and Mechanical Performance Standards (Mandatory Requirements of National Standard, Original Parameters Fully Retained)
|
Performance Test Item |
Mandatory Requirement of National Standard |
General Industry Measured Qualified Value |
|
Sealing Performance |
No air leakage under 200kPa pressure, no cap detachment under 350kPa pressure |
No leakage under 220kPa pressure for 1 minute |
|
Opening Torque |
0.4-2.2N・m (H≤12mm, specification ＜38mm) |
0.9-1.13N・m (8-10 in-lbs) |
|
Break Torque |
≤2.2N·m |
1.8-2.0N·m |
|
Low Temperature Resistance |
No bursting, no deformation, no liquid leakage after freezing at -4℃±1℃ for 24h |
No physical deformation after low-temperature freezing |
|
Drop Performance |
No cap detachment or liquid leakage after 1.4m vertical drop (＜1L) / 1m lateral drop (≥1L) |
No cap detachment in full-height drop test |
|
Impact Resistance |
No cracking or detachment when 4 parts are impacted by steel ball after standing at 4℃ for 24h |
No damage or detachment in multiple impact tests |
|
Grease Bleeding Performance |
No grease-like substances precipitated on the liquid surface |
No precipitates, meeting food hygiene requirements |
|
Safe Opening Performance |
No cap detachment or popping when opening |
Stable opening process, no splashing or cap flying risk |
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