Rotating Perforating Roll for Web Material
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Solution Overview
Problem
Conventional perforating apparatuses for web products, such as paper towels and bath tissue, face issues with reliability, high manufacturing costs, limited flexibility, and suboptimal perforation quality due to vibrations and blade dullness, which result in web breaks and increased waste.
Innovation Solution
The use of a liquid printing device in conjunction with or independently of mechanical perforators to create perforations on webs, allowing for the formation of both linear and nonlinear perforations in both the cross and machine directions, enhancing perforation quality and flexibility while reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moving blade and stationary anvil are used to perforate the web, then perforations are formed to facilitate sheet removal, but vibrations at high speeds adversely affect perforation quality and cause web breaks
Solution Approach 1:
The patent replaces the conventional mechanical moving blade and stationary anvil system with a rotating perforating roll that has circumferential protrusions. This substitution eliminates the harmful vibrations associated with high-speed blade-anvil interaction while maintaining effective perforation. The rotating roll design provides smoother operation at higher web transport speeds, improving both reliability and speed performance.
Solution Approach 2:
The invention introduces a rotatable perforating roll with circumferential protrusions that dynamically engage with the web material. Unlike the static anvil and reciprocating blade, the rotating roll provides continuous, dynamic perforation action that adapts to varying web speeds, reducing vibrations and improving perforation quality at high speeds.
2Reliability
If a moving blade is used for perforation, then perforations are formed, but the teeth become dull or broken after a period of use, requiring shutdown and replacement
Solution Approach 1:
The rotating perforating roll is designed with replaceable or regenerable circumferential protrusions. When the protrusions become worn, the roll can be reconditioned by removing old protrusions and installing new ones, extending the overall service life of the perforating system and reducing downtime for blade replacement.
Solution Approach 2:
The system allows for the discarding of worn circumferential protrusions from the perforating roll and recovering the roll itself for reuse after replacement. This separates the consumable element (protrusions) from the durable component (roll), improving reliability by ensuring consistent perforation quality throughout the service period.
3Adaptability or versatility
If conventional mechanical apparatus is used for perforation, then perforations are formed, but the equipment lacks flexibility to quickly change perforation patterns without significant downtime
Solution Approach 1:
The rotating perforating roll can be dynamically adjusted or replaced to change perforation patterns. The circumferential protrusions can be repositioned or the entire roll can be swapped quickly, allowing the system to adapt to different perforation requirements without the extensive shutdowns needed for conventional blade reconfiguration.
Solution Approach 2:
The perforating roll design can accommodate multiple perforation patterns through different circumferential protrusion configurations. A single roll system can serve multiple functions by changing the arrangement or type of protrusions, providing versatility without requiring multiple specialized blades or complex reconfiguration mechanisms.
4Manufacturing precision
If a moving blade and stationary anvil are used, then perforations are formed, but the interaction imposes a speed limitation due to vibrations
Solution Approach 1:
By replacing the blade-anvil mechanical interaction system with a rotating perforating roll, the patent eliminates the vibration-induced speed limitation. The roll design provides smoother contact with the web, allowing higher operating speeds while maintaining perforation quality, thus increasing manufacturing output without sacrificing precision.
Solution Approach 2:
The dynamic rotation of the perforating roll creates a more favorable interaction with the moving web compared to the static anvil and reciprocating blade. This dynamic system can operate at higher speeds while maintaining manufacturing precision, resolving the contradiction between quality and productivity.
Data Source
AI summary
Apparatuses are disclosed that include forming selected perforation designs and patterns. The perforation designs and patterns can be formed in linear or nonlinear fashion, can extend in the cross direction or the machine direction and can be formed to complement or match an embossed or printed design on the web. The perforation designs and patterns can be formed utilizing various mechanical perforating techniques.