Separable Sheet Material With Channeling Cuts For Controlled Tearing
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Solution Overview
Problem
Existing methods for opening or separating printable sheet materials, such as envelopes and containers, often result in difficulty, messiness, or damage, as existing perforation designs do not ensure a consistent tearing path, leading to inefficiencies and unsatisfactory manufacturing processes.
Innovation Solution
The development of a separable structure with customized tearable lines and connectors, including staggered, angled, or overlapping cut lines and channeling cuts, which control the tearing direction and strength, allowing for easy and controlled separation while minimizing damage and enabling resealing and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing perforation designs are used for separating sheet material portions, then the separation function is provided, but the tearing path is inconsistent and causes damage to the portions being separated
Solution Approach 1:
The separation structure is divided into multiple discrete components: cut lines that create gaps, connectors that bridge these gaps, and channeling cuts that guide the tear. This segmentation allows each element to perform its specific function - the cut lines create separation points, the connectors maintain structural integrity, and the channeling cuts direct the tearing path precisely where needed.
Solution Approach 2:
The tearable line is pre-configured with cut lines, connectors, and channeling cuts during manufacturing. This preliminary action creates a predetermined tearing path that guides the separation process, ensuring that when the user pulls the separable portion, the tear follows the exact intended route without deviating or causing damage to adjacent areas.
2Strength
If connectors are spaced apart to provide strength for connection, then the connection strength is improved, but the tearing path control is reduced causing drift away from desired path
Solution Approach 1:
Channeling cuts act as intermediaries between the connectors and the tearing force. These cuts extend from the cut lines toward the connectors, creating a controlled path that channels the tearing force through the connectors rather than allowing the tear to drift. The channeling cuts mediate between the need for strong connections and the need for precise tear control.
3Ease of operation
If variable forces are applied during separation, then the separation can be initiated, but the tearing path drifts away from the desired path causing damage
Solution Approach 1:
The tearable line structure with channeling cuts is pre-configured to anticipate and counteract variable separation forces. When the user applies force in any direction, the channeling cuts guide the tear along the predetermined path, ensuring that even variable forces result in controlled separation along the desired trajectory.
4Ease of manufacture
If simple perforation designs are used, then the manufacturing process is simplified, but the separation function is insufficient causing messiness and damage
Solution Approach 1:
Rather than using a single complex perforation pattern, the design segments the separation structure into multiple simple elements: cut lines, connectors, and channeling cuts. Each element has a straightforward manufacturing process, but their combination creates a sophisticated separation mechanism that provides clean, controlled, and damage-free separation.
Data Source
AI summary
A printable sheet material includes a panel having an integral separable portion and a starting mechanism formed on the separable portion. At least one tearable line is formed in the panel permitting the separable portion to be at least partially separated from a remaining portion of the panel. The tearable line includes a plurality of open “V” channeling cuts spaced along the line, each of the channeling cuts formed by a converging pair of cuts having a wider spaced end and a narrower spaced end. The channeling cuts are oriented with the wider spaced ends facing toward the starting mechanism to point in a tearing direction extending away from the starting mechanism. A patch is affixed to the remaining portion solely by an adhesive attachment device on the remaining portion and the patch overlaps less than an entire facing surface of the separable portion wherein when the sheet material is formed into an envelope and the separable portion is at least partially separated from the remaining portion an opening is created between an edge of the patch and the separable portion for at least one of direct view of, access to, and extraction of contents within the envelope.