Friction Shaft Sealing for Low-Pressure Slitter Core Fixing

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Solution Overview

Problem

Existing friction shafts for slitters suffer from compressed air leakage, leading to unstable fixing of reel cores and a narrow range of adjustable rolling torque, necessitating high air pressure to maintain stability.

Innovation Solution

A friction shaft design with a rotary shaft, friction cores, and sealing mechanisms that prevent air leakage, allowing for stable fixation of winding pipes at low air pressure and adjustable torque through controlled air supply.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If compressed air pressure is increased to stably fix the reel core, then the fixing stability is improved, but the range of adjustable rolling torque becomes narrow

Engineering Contradiction:

Improvefixing stabilityVSAvoidrange of adjustable rolling torque

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The friction core is divided into multiple independent pressing plates that can be individually adjusted. Each pressing plate applies pressure to the reel core independently, allowing for fine-tuned distribution of clamping force across multiple contact points, thereby achieving stable fixing while maintaining adjustability across a wide torque range

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pressing plates are designed to be movable and adjustable in real-time. The position and pressure of each pressing plate can be dynamically modified to adapt to different rolling torque requirements, enabling the system to maintain stable fixing across a wide range of adjustable torques rather than being locked at a fixed pressure point

Inventive Principle:

Principle #15Dynamics

2Reliability

If compressed air pressure is increased to ensure stable fixing, then the fixing reliability is improved, but the compressed air consumption increases

Engineering Contradiction:

Improvefixing reliabilityVSAvoidcompressed air consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Instead of applying high compressed air pressure uniformly across all pressing plates, the system uses multiple pressing plates that each apply partial pressure. The cumulative effect of multiple moderate-pressure plates achieves the same total clamping force as fewer high-pressure plates, thereby reducing overall compressed air consumption while maintaining fixing reliability

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

Multiple pressing plates are used as copies of a single pressing mechanism. Each plate replicates the basic clamping function, and their combined effect achieves reliable fixing with lower individual and total air pressure requirements, thus reducing compressed air consumption while maintaining reliability

Inventive Principle:

Principle #26Copying

3Ease of manufacture

If the structure is simplified to reduce complexity, then the ease of manufacture is improved, but the sealing performance deteriorates

Engineering Contradiction:

Improvestructural simplicityVSAvoidsealing performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A flexible sealing ring made of elastic material is used to seal the air supply passage. The elastic nature of the sealing ring allows it to conform to the mating surfaces and maintain effective sealing even with simple structural design, thus achieving good sealing performance without increasing structural complexity

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The sealing performance is improved by changing the material parameters of the sealing ring (using elastic material with appropriate durometer) rather than increasing structural complexity. The material properties themselves provide the sealing function, allowing simple structure to achieve reliable sealing

Inventive Principle:

Principle #35Parameter changes

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

Enables stable rolling of materials with predetermined intervals using a wide range of rolling tensions, reducing air pressure requirements and enhancing the versatility of materials that can be processed.

Implementation Method 1

a cylindrical tube configured to cover and finish the insertion groove between the pair of sealing rings, and configured to be expanded by compressed air that is supplied from the air supply hole

Methodology Applied

Scientific EffectPneumatic expansion: Pressurisation

Implementation Method 2

elastic members disposed between the insertion groove and the clamping lugs to partially insert the clamping lugs back into the exposure holes when supply of the compressed air is stopped

Methodology Applied

Scientific EffectElastic recovery: Elasticity

Implementation Method 3

compressed air that is supplied from the air supply hole

Methodology Applied

Scientific EffectPneumatic pressure: Pressurisation

Data Source

PatentEP4186835B1Friction shaft for slitter

Publication Date: 2026.04.22 KIM BYUNG HWA

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AI summary

Proposed is a friction shaft for a slitter that enables a winding pipe to stably roll unit materials formed by cutting a raw material, such as a raw fabric or film, with predetermined intervals, that can fix the rolling pipe even at a low pressure of compressed air, and that has a wide range of available rolling tension because the pressure range of compressed air that can adjust winding torque is wide.