Partitionable paper towel
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Solution Overview
Problem
Current paper towel products struggle to efficiently separate into smaller sizes, such as half or quarter sheets, due to the introduction of weaknesses during the converting process, particularly when incorporating machine direction perforations, which can lead to breakage and fail to meet consumer demands for customizable sizes while minimizing waste.
Innovation Solution
A paper towel product with perforations in the machine direction, designed to allow separation into full, half, or quarter sheets, by employing specific perforation strengths and configurations that avoid introducing weaknesses during the converting process, using a combination of cross-machine direction and perpendicular perforation lines, and optimizing the perforation unit length, bond length, and cut length to ensure reliable separation without breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If machine direction perforations are added to enable separation into smaller sizes, then adaptability is improved, but reliability deteriorates due to sheet breakage during converting
Solution Approach 1:
The paper towel sheet is segmented into multiple separable sections using perforation lines in both cross-machine direction (CD) and machine direction (MD). CD perforations enable separation into half-sheets, while MD perforations enable separation into quarter-sheets, providing versatile size selection while maintaining sheet integrity through controlled perforation design
Solution Approach 2:
Different perforation characteristics are applied to different directions: CD perforations have specific bond lengths and cut lengths optimized for half-sheet separation, while MD perforations have different characteristics optimized for quarter-sheet separation. This local differentiation allows each perforation system to function reliably for its intended purpose without compromising overall sheet strength
2Adaptability or versatility
If perforation frequency is increased to provide more separation options, then adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges two perforation systems (CD and MD perforations) into a single paper towel product. CD perforations provide half-sheet separation capability, while MD perforations provide quarter-sheet separation capability. By combining these two simple perforation systems rather than creating complex variable perforation patterns, the manufacturing process remains relatively simple while achieving multiple separation options
3Reliability
If perforation strength is increased to prevent breakage, then reliability is improved, but ease of operation deteriorates as separation becomes difficult
Solution Approach 1:
The perforation design uses specific parameter ranges: bond lengths of 0.5-1.5mm and cut lengths of 2-5mm for CD perforations, and bond lengths of 0.3-1.0mm and cut lengths of 1-4mm for MD perforations. These parameters create perforations with controlled strength characteristics that are strong enough to prevent unintended breakage during handling but weak enough to allow easy separation along the perforation lines when pulled
Data Source
AI summary
The present disclosure is directed to a paper towel product that will capably separate from the paper towel roll as a full sheet, a half sheet or a quarter sheet. A method of making a paper towel with machine direction perforations is also disclosed.