Interfolded Sheet Stack Dispensing With Offset Tear Lines

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Solution Overview

Problem

Existing dispensers for sheet products often experience unintended tearing of web material along the dispensing path, leading to difficulties in dispensing subsequent sheets without opening the dispenser, and inconsistent dispensing performance due to the convex or rounded shape member not engaging with the top of the stack under full container conditions.

Innovation Solution

The use of interfolded webs with offset lines of weakness, where the leading portion extends upwardly from the top of the stack, supported by a dispensing path that includes nips to prevent fallback and ensure consistent dispensing, allowing for upward dispensing without the weight of the stack bearing on the web material, and featuring a guide member to facilitate smooth movement and grasping at the dispensing opening.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If upward dispensing is used to prevent unintended tearing at the bottom, then sheet product integrity is improved, but tearing may occur along the dispensing path before the web passes the dispensing opening

Engineering Contradiction:

Improvesheet product integrityVSAvoiddispensing reliability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The web is divided into multiple sections with lines of weakness at different longitudinal positions, creating segmented tear zones that control where separation occurs during dispensing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lines of weakness in the first and second webs are positioned asymmetrically relative to each other in the longitudinal direction, creating an offset pattern that ensures one web always has an intact leading portion available for grasping

Inventive Principle:

Principle #4Asymmetry

2Productivity

If the container is filled to capacity, then productivity is improved, but the convex or rounded shape member does not engage with the top of the stack, causing inconsistent dispensing performance

Engineering Contradiction:

Improvecontainer fill capacityVSAvoiddispensing consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The leading portion of the web is directed upwardly from the top of the stack in a vertical dimension, allowing the web to extend above the stack height and ensuring engagement with the dispensing path components regardless of container fill level

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The upwardly extending leading portion acts as an intermediary element that bridges the gap between the stack top and the dispensing path, ensuring consistent engagement even when the container is full

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the weight of the stack is placed on the web being dispensed, then device complexity is reduced, but there is a greater chance of users grasping multiple sheets and increased compression at the bottom

Engineering Contradiction:

Improvesupport structure simplicityVSAvoidsingle sheet retrieval

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Instead of having the web extend downward from the stack top, the leading portion is inverted to extend upwardly, reversing the conventional arrangement and preventing weight-induced compression that makes sheet separation difficult

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP2731896B1Dispenser and stack of sheet products

Publication Date: 2015.09.09 SCA HYGIENE PRODUCTS AB

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AI summary

A dispenser and a stack combination. The stack is a stack of interfolded webs wherein the lines of weakness of one web are offset from the lines of weakness of another web in a longitudinal direction.