Filter Insert Labeling After Folding to Reduce Paper Stress
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Solution Overview
Problem
Existing methods for producing filter inserts, such as those for coffee and tea filters, require significant space and can cause material damage due to the placement of labels before folding, leading to local weaknesses and inefficiencies in the production process.
Innovation Solution
The method involves folding the filter paper sheet into a double layer and labeling after folding, allowing for labels to be applied on both sides without causing material stress, reducing space requirements, and combining process steps for improved efficiency and reduced risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the label is stamped on the single-ply filter paper sheet before folding, then the labeling process is simple, but a lot of space is required for the arrangement of the stamping equipment and the label can only be identified on one side
Solution Approach 1:
The patent inverts the conventional sequence by folding the filter paper sheet into a double layer first, then stamping the label on the folded structure. This reversal allows the stamping device to access both sides of the filter insert simultaneously through the folded configuration, eliminating the need for large equipment arrangements while enabling bidirectional label visibility.
Solution Approach 2:
By folding the flat single-ply sheet into a three-dimensional double-layer structure, the patent creates additional spatial dimensions for label placement. The label stamped on the folded structure appears on both outer surfaces, effectively utilizing the folded geometry to achieve dual-sided visibility without requiring equipment positioned on opposite sides of a flat sheet.
2Ease of manufacture
If the label is stamped on the single-ply filter paper sheet before folding, then the process sequence is straightforward, but stamping causes local weakness in the material which can lead to damage
Solution Approach 1:
The patent reverses the operation sequence to fold first and stamp later. By folding the sheet into a double layer before stamping, the structural integrity is established first, and the stamping force is distributed across the folded configuration rather than creating concentrated weak points on a single thin layer, thereby reducing the risk of material damage.
Solution Approach 2:
The folding operation serves as a preparatory step that creates a more robust double-layer structure before the stamping operation. This pre-folding provides structural cushioning that distributes the stamping force and prevents localized material failure that would occur on a single-ply sheet.
3Ease of operation
If the filter paper sheet is processed in single layer, then the handling is simple, but the sheet is more heavily stressed by the conveyor and can be easily damaged
Solution Approach 1:
The patent combines two single-ply sheets into a double-layer structure through folding. This merging creates a thicker, more robust configuration that is more resistant to conveyor stress and handling damage, while the folded structure maintains manageable dimensions for continued processing and final product formation.
Data Source
AI summary
A method and a device for producing filter inserts (1), in particular filter inserts (1) for preparing a coffee or tea filtrate, including the continuous folding (A) of a filter paper sheet (2) into a double layer (3), partially binding (B) the double layer (3) to a plurality of interconnected filter inserts (1) using at least one stamped seam (4) and separating (D) the interconnected filter inserts (1) from the filter paper sheet (2). The filter inserts (1) are provided with a label (5) after folding (A).