Perforating Apparatus with Shaped Anvil and Flex Blade
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Solution Overview
Problem
Current methods for creating lines of weakness in rolled products, such as sanitary tissue products, face challenges in producing high-speed, consistent, and cost-effective shaped perforations, which are essential for distinguishing products and enhancing user interaction, but often result in processing complexities and inconsistencies.
Innovation Solution
A perforating apparatus comprising a rotating cylinder with a shaped anvil and a moveable support featuring a blade with teeth and recessed portions, allowing for precise control over perforation lengths and non-linear patterns, enabling the creation of shaped lines of weakness that are both functional and visually distinct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If die cutting is used to create perforations, then accuracy is improved, but speed and replacement cost effectiveness deteriorate
Solution Approach 1:
The patent replaces the mechanical die cutting system with a flex blade cutting system. The flex blade apparatus uses a flexible blade that flexes against a stationary blade or anvil during operation, eliminating the need for heavy mechanical dies and anvils. This substitution enables high-speed production while maintaining accurate perforations through the controlled flexing action of the blade.
2Productivity
If flex blade cutting is used to create perforations, then speed and cost-effectiveness are improved, but perforation consistency at long widths deteriorates
Solution Approach 1:
The patent employs a dynamic flex blade system where the blade is allowed to flex during the cutting operation. This dynamic action allows the blade to adapt to variations in web tension and positioning, maintaining consistent perforation quality across long widths while operating at high speeds. The flexibility of the blade compensates for minor misalignments and web variations.
Solution Approach 2:
The patent optimizes parameters such as blade flexibility, blade angle, and anvil contact pressure to achieve consistent perforations at high speeds. By carefully controlling these parameters, the system maintains perforation quality across the entire web width while operating at production speeds that are economically viable.
3Shape
If two rotating rolls are used to create shaped lines of weakness, then product differentiation is improved, but device complexity and operational difficulty deteriorate
Solution Approach 1:
The patent segments the shaping function into a stationary shaped anvil rather than requiring two rotating rolls. The anvil is formed with the desired shaped perforation pattern and remains stationary while the flex blade moves across it. This segmentation simplifies the equipment by eliminating the need for synchronized rotating rolls while still producing the desired shaped perforations for product differentiation.
Solution Approach 2:
Instead of using two rotating rolls where both components must be synchronized, the patent inverts the approach by using a stationary shaped anvil and a moving flex blade. This inversion eliminates the synchronization requirement and reduces equipment complexity while achieving the same shaped perforation effect.
4Productivity
If high-speed operation is implemented, then productivity is improved, but manufacturing precision and consistency deteriorate
Solution Approach 1:
The flex blade system is designed to be self-adjusting to some extent. The flexibility of the blade allows it to automatically compensate for minor variations in web tension, positioning, and anvil contact pressure during high-speed operation. This self-service characteristic helps maintain perforation consistency without requiring complex active control systems.
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
The apparatus effectively produces consistent, high-speed shaped perforations that enhance product differentiation and user interaction, while maintaining operational efficiency and reducing processing complexities.
Implementation Method 1
flex blade cutting is a cut created by shearing the web
Data Source
AI summary
A perforating apparatus includes a longitudinal cylinder axis about which a cylinder rotates. At least one shaped anvil is disposed on the cylinder. Further, a support operatively engages with the cylinder, and the support is moveable with respect to the cylinder. A blade is disposed on the support so as to cooperate in contacting relationship with the anvil, and the blade is substantially parallel to the longitudinal cylinder axis. At least one of the blade and the anvil comprises a plurality of teeth, and adjacent teeth are separated by a recessed portion. A web is perforated as the web passes between the rotating cylinder and the support and the blade cooperates with the anvil.