Motor-Driven Rotary Knife for Tissue Core Cleaning

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Solution Overview

Problem

Conventional methods for cleaning large tissue cores, such as using manual knives or mechanical roll cutters, often damage the sensitive material and result in 'confetti' issues due to shallow cuts and material tearing, making re-use impossible and creating environmental and economic challenges.

Innovation Solution

A motor-driven rotary knife system that allows for deeper cuts and reduces loose material, enabling efficient removal of residues by rotating the roll to facilitate easy material disposal without tearing, thereby increasing the core's re-usability and reducing environmental disturbances.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional mechanical roll cutters are used to remove material residues, then cleaning action is achieved, but material is torn and confetti is generated causing capacity problems

Engineering Contradiction:

Improvecleaning capabilityVSAvoidcapacity

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent replaces the conventional mechanical roll cutter system with a motor-driven rotary knife system. The rotary knife rotates at controlled speeds (5-500 rpm) and engages the material at specific angles (30-60 degrees) to achieve clean cutting without tearing. This substitution eliminates the confetti generation problem while maintaining effective material removal capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention introduces dynamic elements by rotating the knife rather than using a stationary cutting tool. The rotary knife can be adjusted in rotation speed and engagement angle, allowing optimization of cutting performance. The material is also rotated during the cutting process, creating dynamic relative motion that improves cut quality and reduces material tearing.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If conventional roll cutters make shallow cuts, then material damage is reduced, but cut section depth is insufficient leaving residues

Engineering Contradiction:

Improvecut qualityVSAvoidresidue removal completeness

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent transitions from shallow single-dimension cutting to deep multi-dimensional cutting. The rotary knife geometry and rotation allow cutting depths of several centimeters, dramatically increasing the volume of material removed in each pass. The knife engages the material at optimized angles and maintains cutting action throughout the rotation, achieving complete residue removal while preserving material integrity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Object-affected harmful factors

If manual knives are used for cleaning, then material damage is minimized, but the process is time-consuming and labor-intensive

Engineering Contradiction:

Improvematerial damageVSAvoidcleaning time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The system automates the cleaning process through motor-driven rotation of both the knife and the material roll. The operator simply positions the material and starts the motor; the system then automatically performs the cutting and removal operations. This eliminates manual labor while maintaining gentle handling that prevents material damage, significantly reducing cleaning time.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The rotary knife operates continuously during each cutting cycle, maintaining constant engagement with the material throughout its rotation. This continuous cutting action is more efficient than intermittent manual cutting, reducing the time required while the controlled rotation speed and engagement angle ensure gentle handling that prevents material damage.

Inventive Principle:

Principle #20Continuity of useful action

4Quantity of substance

If deep cuts are made with conventional cutters, then residue removal is improved, but material is torn and confetti increases

Engineering Contradiction:

Improveresidue removalVSAvoidconfetti

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent optimizes multiple parameters simultaneously: knife rotation speed (5-500 rpm), engagement angle (30-60 degrees), and knife geometry. These parameter changes enable deep cutting action while maintaining clean cuts without tearing. The controlled parameters ensure that even at several centimeters depth, the material is cut smoothly rather than torn, eliminating confetti generation.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9862565B2Method for removal of material residues from rolls with a material carrying core

Publication Date: 2018.01.09 CORE LINK AKTIE BOLAGET

AI summary

The present invention concerns a method for removal of material residues, particularly tissue or similar porous, non-self-supporting materials, from a material-carrying core, which often has relatively large dimensions, e.g. a diameter of approx. 300 mm and a length of approx. 2540 mm, and thereby allow re-use of the core in the same way as new and unused cores a number of times for winding non-self-supporting or porous material, particularly tissue, wherein a cut section is made in the envelope surface of the roll having the material-carrying core from one end or end portion of the roll to the other end or end portion of the roll by means of a driven rotary knife, which is connected to a motor for rotation of the same.