Paper Core Internal Spraying for Uniform Fragrance Deposition

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Solution Overview

Problem

Existing methods for applying fragrances and other active ingredients to tissue product cores result in inefficient distribution and rapid evaporation, leading to non-uniform application and environmental contamination, especially during high-speed manufacturing.

Innovation Solution

An apparatus and process that applies active ingredients, such as microcapsules, to the interior of the core using a fluid dispensing unit positioned at the end of the winding mandrel, ensuring uniform distribution and containment within the core.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If fragrance is sprayed onto the inner surface of the core, then the scent spreads efficiently throughout the environment, but the persistence of smell is short due to volatility

Engineering Contradiction:

Improvescent spread efficiencyVSAvoidpersistence of smell

Core Design Contradiction:

Ease of operationVSDuration of action of moving object

Solution Approach 1:

The patent introduces microencapsulated fragrance particles as an intermediary carrier. These microcapsules contain the fragrance material and release it gradually over time, acting as a mediator between the fragrance source and the environment. This resolves the contradiction by maintaining efficient scent distribution while extending persistence through controlled release mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the physical state and delivery parameters of the fragrance by using microencapsulation technology. The fragrance is transformed from a volatile liquid spray into solid or semi-solid microcapsules that can be incorporated into the core material, fundamentally altering how the fragrance is released and persisted in the environment.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If fragrance is applied to the outer surface of the core, then the smell spreads more slowly, but the spread efficiency is reduced as it is contained by the tissue product

Engineering Contradiction:

Improvespread rateVSAvoidscent distribution efficiency

Core Design Contradiction:

Duration of action of moving objectVSEase of operation

Solution Approach 1:

Instead of applying fragrance to the outer surface as conventionally done, the patent inverts the approach by applying the fragrance-containing microcapsules to the inner surface of the core. This inversion allows the fragrance to be released from the inside outward, achieving both slow release and efficient distribution without being blocked by the tissue product layer.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If high-speed manufacturing is used, then productivity is improved, but nozzle synchronization issues occur during the spraying process

Engineering Contradiction:

Improvemanufacturing speedVSAvoidnozzle synchronization

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies the fragrance-containing fluid to the core surface before the core is fully formed and before the tissue product is wound onto it. This preliminary application ensures that the fragrance is deposited uniformly on the inner surface at high speed without requiring complex synchronization with subsequent winding operations, as the spraying occurs in a dedicated pre-processing stage.

Inventive Principle:

Principle #10Preliminary action

4Device complexity

If fragrance is sprayed without microcapsules, then the application process is simpler, but environmental contamination occurs during high-speed manufacturing

Engineering Contradiction:

Improvespray system complexityVSAvoidenvironmental contamination

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The microcapsules serve as a contained intermediary that prevents direct contact between the fragrance material and the external environment during handling and application. The encapsulation acts as a barrier that contains the fragrance within the microcapsule structure, preventing contamination while allowing for simple spray application of the encapsulated particles.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Ensures uniform application and prolonged persistence of active ingredients by preventing evaporation and reducing environmental contamination, while allowing high-speed production without nozzle synchronization issues.

Implementation Method 1

The fluid dispensing unit is a nozzle which dispenses the fluid in a conical pattern so as to apply the fluid uniformly on the inner surface of the tube as the tube travels over the nozzle

Methodology Applied

Scientific EffectSpray: Fluid Spray

Implementation Method 2

The microcapsules can be carried by a liquid, which can be propelled by a pressurized gas

Methodology Applied

Scientific EffectPressurized gas propulsion: Pressure Gradient

Data Source

PatentUS20250354336A1Internal Spraying of Paper Product Cores

Publication Date: 2025.11.20 KIMBERLY CLARK WORLDWIDE INC

AI summary

An apparatus for producing tubes comprises a mandrel, a winding unit, and a fluid dispensing unit. The tube is formed as the winding unit winds at least one strip of web material around the mandrel and advances the tube along the mandrel toward a distal end of the mandrel. The fluid dispensing unit is disposed at the distal end of the mandrel and is configured to dispense a fluid to the inner surface of the tube as it advances past the distal end of the mandrel.