Managing Medium-to-High Viscosity Formulations with 4mm Orifice Dispensing Cap Design

Problem Definition: Why Medium-to-High Viscosity Products Dispense Unevenly

In cosmetic tube packaging, paste- and gel-based products (such as facial cleansers, hand creams, and face creams) typically exhibit medium-to-high viscosity characteristics. During actual use, these types of products are prone to the following issues:

• Discontinuous dispensing (intermittent flow, or "extruding in spurts")
• Deviation in the dispensing direction, causing the product to accumulate on one side of the opening
• Variations in extrusion pressure, resulting in inconsistent product output per squeeze

In cosmetic tube packaging, medium-to-high viscosity products such as creams and gels often suffer from inconsistent dispensing. Issues like interrupted flow, uneven direction, and unstable output are typically caused by a mismatch between product viscosity and dispensing structure.

Key Parameter: The Role of a 4.0 mm Orifice in Flow Control

In the design of dispensing mechanisms, **orifice size** is one of the critical parameters influencing flow stability.

A 4.0 mm dispensing orifice offers the following characteristics in medium-to-high viscosity applications:

• Provides stable flow resistance: Prevents excessive instantaneous flow rates that can result from an overly large opening.
• Balances dispensing speed with control capability: Ensures smooth extrusion without compromising control.
• Compatible with the typical viscosity range of common skincare pastes: Such as facial cleansers, hand creams, and cream-based products.

A 4.0 mm orifice plays a critical role in balancing flow rate and control. It introduces sufficient resistance to prevent sudden over-dispensing while allowing smooth output for medium-to-high viscosity formulations such as creams and gels.

Structural Synergy: How Center Flow Path Improves Stability

In addition to orifice size, the structure of the dispensing path also influences final performance. The center dispensing design optimizes the fluid path through a single, symmetrical channel:

• Reducing off-center flow
• Minimizing the risk of residue accumulation
• Enhancing dispensing consistency

In addition to orifice size, a centralized flow path ensures that the product exits evenly. When combined with a 4.0 mm outlet, the system provides improved consistency and reduces residue buildup.

Material Considerations: Balancing Structural Stability and User Experience

Beyond discharge stability, the material structure also influences overall performance. A common approach involves a dual-material design utilizing PP and TPE:

• PP Inner Layer (Structural Component): Provides rigid support, ensuring the stability of the discharge channel.
• TPE Outer Layer (Soft-Touch Surface): Offers a soft tactile feel and anti-slip properties.

Material selection further enhances performance. A PP inner structure ensures rigidity and stability, while a TPE outer layer improves grip and tactile comfort, especially in wet conditions.

Application Scenarios: Suitable Product Types

基于4.0 mm孔径与中心出料结构的组合,该类出料盖适用于:

1. Hand Creams & Facial Creams

• High viscosity
• Requires stable extrusion and precise dosage control

2. Facial Cleansers

• Semi-fluid consistency
• Requires prevention of excessive discharge in a single squeeze

3. Gel-based Products

• Flow properties fall between those of liquids and pastes
• Requires a high degree of discharge continuity

This configuration is suitable for creams, cleansers, and gels. Compatibility with standard tube sizes (D35–D45) and bottle formats (50–500 ml) makes it versatile for various product lines.

Selection Guide: How to Evaluate the Right Orifice Size

During the selection process, it is recommended to evaluate the options from the following perspectives:

1. Product Viscosity Range

Ensure that the orifice size (e.g., 4.0 mm) is compatible with the product's flow properties.

2. Dispensing Control Requirements

If "precise dosing" is a priority, preference should be given to designs featuring a medium-sized orifice.

3. Usage Scenario

Products intended for frequent use or those designed for portability require particularly stable and consistent dispensing performance.

4. Structural Design and Material Combination

When selecting a dispensing cap, consider viscosity, control requirements, usage scenarios, and material structure. A well-matched orifice size can significantly improve dispensing consistency.

Conclusion

For medium-to-high viscosity formulations, a 4.0 mm orifice combined with a center dispensing structure offers a reliable and practical solution for consistent dispensing.