Interfolding Machine Cutting Roller Distribution

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Solution Overview

Problem

Existing interfolding machines are complex, difficult to maintain, and inflexible, requiring multiple rollers and high vacuum consumption, limiting their ability to produce both single-fold and multi-fold stacks efficiently.

Innovation Solution

A simplified interfolding machine design featuring a cutting section with a cutting roller and a transfer roller, where the cutting roller alternately distributes sheets to first and second folding rollers via different feeding paths, allowing for flexible production of single-fold and multi-fold stacks with reduced vacuum consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional interfolding machines use multiple rollers and complex feeding paths to produce both single-fold and multi-fold stacks, then production versatility is improved, but device complexity and maintenance difficulty increase

Engineering Contradiction:

Improveproduction versatilityVSAvoidmachine complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The cutting roller is designed to perform multiple functions: it acts as both a cutting device and a distribution mechanism that can alternately direct sheets to different feeding paths (first feeding path to first folding roller, second feeding path to second folding roller). This multi-functionality eliminates the need for separate distribution mechanisms and reduces overall machine complexity while maintaining the ability to produce both single-fold and multi-fold stacks.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the cutting function and the distribution function into a single integrated cutting roller assembly. By combining these functions and using the cutting roller itself to alternately distribute sheets to different feeding paths, the machine reduces the number of separate components and simplifies the overall structure while retaining production versatility.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If traditional interfolding machines use multiple rollers and complex assembly structures, then production capability is improved, but ease of manufacture and assembly speed deteriorate

Engineering Contradiction:

Improveproduction capabilityVSAvoidassembly speed

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The machine is divided into distinct functional modules: a cutting section with the cutting roller, a folding section with first and second folding rollers, and feeding paths that can be independently configured. This segmentation allows each module to be manufactured and assembled separately, improving ease of manufacture and assembly speed while maintaining full production capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting roller is designed with dynamic distribution capability, allowing it to alternately direct sheets to different feeding paths based on operational requirements. This dynamic functionality is achieved through the roller's rotational mechanism and sheet positioning system, enabling flexible production of both single-fold and multi-fold stacks without requiring complex static structures.

Inventive Principle:

Principle #15Dynamics

3Reliability

If traditional interfolding machines use high vacuum consumption to handle sheets through multiple rollers, then sheet control is improved, but energy efficiency deteriorates

Engineering Contradiction:

Improvesheet controlVSAvoidvacuum consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The invention extracts and eliminates unnecessary vacuum application points from the traditional multi-roller system. By using the cutting roller itself for sheet distribution and reducing the number of intermediate rollers, the system reduces the number of locations where vacuum is needed, thereby lowering overall vacuum consumption while maintaining adequate sheet control through the simplified path.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cutting roller continuously performs both cutting and distribution functions in an integrated manner, eliminating the need for separate distribution rollers that would require additional vacuum points. The continuous rotational motion of the cutting roller maintains sheet control throughout the distribution process, reducing energy consumption while ensuring reliable sheet handling.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS11891263B2Interfolding machine

Publication Date: 2024.02.06 VALMET TISSUE CONVERTING SRL

AI summary

An interfolding machine produces interfolded sheets according to an interfolding configuration and, starting from a web of paper provides a feeding section, which applies a tension on the web and moves the same along a feeding direction feeding the same to a cutting section, in which the web of paper is cut into a series of sheets at a cutting point between a cutting roller and a counter-cutting element. Downstream of the cutting section, a folding section includes a first and a second folding rollers counter-rotating with respect to each other. The first and second folding rollers rotate about respective rotation axes with a first peripheral velocity vP, and fold, at a folding zone, a plurality of sheets in a plurality of panels and form the stack of interfolded sheets. The cutting roller alternately distributes the aforementioned sheets between a transfer roller and the first folding roller.