Material Splicing Fin Structure for Tension Stability
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Solution Overview
Problem
The existing method for splicing materials in absorbent articles results in material fluttering and tension variations due to impact when the bonded portion reaches the moving roll.
Innovation Solution
A method involving the formation of a fin-like portion upstream from the bonded area by cutting the preceding material, ensuring the total length of the bonded and stacking portions exceeds the path length from the downstream end of one winding portion to the upstream end of another, while maintaining the moving roll at a reference position to stabilize the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the leading end portion of the subsequent material is bonded with the preceding material to form a bonded portion, then material splicing is achieved, but the material is impacted when the bonded portion reaches the moving roll, causing fluttering and tension variation
Solution Approach 1:
The fin-like portion is formed upstream from the bonded portion before the material reaches the moving roll. This preliminary structural modification allows the material to gradually transition from a single-layer to a double-layer structure, preventing sudden impact and fluttering when the bonded portion reaches the moving roll, thereby maintaining material tension stability during splicing
Solution Approach 2:
The material transition zone is segmented into distinct portions: the bonded portion where splicing occurs, the fin-like portion upstream that gradually increases layer thickness, and the stacking portion downstream. This segmentation allows each portion to serve its specific function - the fin-like portion acts as a buffer zone that gradually absorbs the transition, preventing sudden tension changes
2Stability of the object's composition
If the total length of the bonded portion and stacking portion is made larger than the path length from the downstream end of one winding portion to the upstream end of another winding portion, then material stability is improved, but the cutting position must be precisely controlled upstream
Solution Approach 1:
The fin-like portion is created by cutting the preceding material at a predetermined position upstream from the bonded portion. This preliminary cutting action establishes the correct length relationship between the bonded portion, stacking portion, and the path length between winding portions, ensuring material stability is achieved through pre-planned dimensional design
Solution Approach 2:
The invention specifies a precise parameter relationship: the total length of the bonded portion and stacking portion must be larger than the path length from the downstream end of one winding portion to the upstream end of another winding portion. This parameter control ensures that the material maintains appropriate tension and stability throughout the transport path
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A method for splicing a material associated with an absorbent article, including: transporting the material in a direction of transport with a material wound around an entrance roll (41u) and a moving roll (41m) of a dancer unit (40); splicing a subsequent material (3f) with a preceding material (3a) which is a material being transported, by bonding a leading end portion of the subsequent material with the preceding material; and cutting the preceding material so that the total length of a bonded portion (3j) and an stacking portion (3d) is larger than a path length of the material from a downstream end (P3) of a winding portion of the material that is wound around the entrance roll to an upstream end (P4) of another winding portion of the material that is wound around the moving roll positioned at a reference position.