Nonlinear Web Perforation With Reciprocating Wear Control
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Solution Overview
Problem
Existing methods for creating nonlinear lines of weakness in web materials face challenges such as uneven wear of perforating equipment components due to varying angles of interaction, leading to premature repair or replacement, and the need for multiple machines for different perforation patterns, resulting in high costs and production delays.
Innovation Solution
A perforating apparatus with a blade and counter component that reciprocally shift to match the width of a nonlinear shape, minimizing uneven wear by ensuring each tooth experiences equal work, and allowing for different perforation patterns without equipment modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a nonlinear shaped line of weakness is provided, then the article can be torn along a curved path for better package opening, but the perforating blade and counterpart experience uneven wear leading to premature replacement
Solution Approach 1:
The patent applies the dynamics principle by making the perforating blade reciprocally shift during the perforation process. The blade moves back and forth in the machine direction while perforating the nonlinear shape, ensuring that all sections of the blade interact with the counterpart at substantially the same angle. This dynamic movement equalizes the wear distribution across the blade and counterpart surfaces, preventing localized groove formation and extending component service life while maintaining the desired nonlinear perforation pattern
2Adaptability or versatility
If multiple machines are used for different perforation patterns, then various product lines can be served, but costs increase and production delays occur
Solution Approach 1:
The patent applies the universality principle by designing a single perforating machine capable of producing multiple nonlinear perforation patterns. The machine achieves this through programmable control of the blade reciprocating motion and counterpart rotation, allowing it to create different curved, angled, and nonlinear perforation patterns without requiring physical reconfiguration or multiple dedicated machines. This multi-functional capability enables one machine to serve multiple product lines with varying perforation requirements
3Shape
If a nonlinear shaped line of weakness is provided, then aesthetic and functional benefits are achieved, but equipment complexity and cost increase
Solution Approach 1:
The patent reduces equipment complexity by implementing a controlled dynamic system where the blade reciprocatingly shifts and the counterpart rotates in a coordinated manner. This dynamic coordination, controlled through programmable logic controllers and sensors, allows the equipment to produce complex nonlinear patterns using relatively simple mechanical movements. The system monitors blade position and counterpart rotation to maintain proper alignment, achieving sophisticated perforation patterns without requiring equally sophisticated mechanical structures
Solution Approach 2:
The patent applies parameter changes by controlling the reciprocating motion parameters (amplitude, frequency, timing) and counterpart rotation parameters to generate different nonlinear perforation patterns. By varying these motion parameters programmatically, the equipment can produce diverse curved and angled patterns without changing the physical configuration of the blade or counterpart, thereby reducing equipment complexity while maintaining shape versatility
Data Source
AI summary
A method for providing a nonlinear line of weakness on a web material including providing: a base, a support, a blade, and a driving means. The base may comprise at least one counter component having a length (LCC) where the counter component comprises a nonlinear shape having a shape width (W) and may have a plurality of teeth. The support may be operatively engaged with the base. The blade may have a length (LB) and may be disposed on the support so as to either contact or to come in close proximity with the counter component. At least one of the counter component and the blade may have a nonlinear shape.