Cardboard Cigarette Filter Presectioning Lines
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Solution Overview
Problem
Existing cardboard filters for rolling cigarettes face issues with pre-cuts that are difficult to control, leading to unwinding and inconsistent folding, which affects the diameter and functionality of the filter.
Innovation Solution
Cardboard filters with presectioning lines that extend only over part of the thickness, allowing for easy rolling and maintenance, using a tool that cuts the fibers partially to facilitate clean and easy folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-cuts extend through the entire thickness of the cardboard strip, then folding is facilitated, but the cardboard loses structural integrity and unrolls
Solution Approach 1:
The pre-cut lines are segmented to extend only partially through the cardboard thickness (from one face to a depth of 0.5-2mm), rather than completely through. This segmentation allows the cut to provide folding guidance while leaving sufficient uncut material to maintain roll stability and prevent unrolling.
Solution Approach 2:
The cutting depth varies locally across the cardboard thickness. The pre-cuts penetrate deeply enough to create visible guidance lines and facilitate folding, but stop before compromising the overall structural integrity of the roll. This local differentiation of cut depth optimizes both folding ease and roll stability.
2Ease of operation
If pre-cuts are made too deep, then folding becomes easier, but the filter geometry becomes inconsistent
Solution Approach 1:
The pre-cuts are prepared in advance at a controlled depth during manufacturing, creating guidance lines that facilitate subsequent folding operations. This preliminary action ensures consistent folding geometry without requiring excessive cut depth, thereby maintaining filter geometry consistency across production batches.
3Stability of the object's composition
If pre-cuts are not deep enough, then roll stability is maintained, but folding becomes difficult
Solution Approach 1:
The mechanical cutting process is replaced or supplemented with thermal or laser cutting methods that can precisely control cut depth. This substitution allows for extremely precise control of pre-cut depth, creating sufficient guidance for folding while maintaining roll stability through consistent, controlled penetration depth.
Data Source
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AI summary
The present invention relates to a cardboard cigarette filter formed by winding a strip of cardboard (100), characterized in that said strip of cardboard (100) comprises several pre-cut lines (110) which extend over the width of the strip but only over a part of its thickness.