Laser Cutting Absorbent Articles to Reduce Blade Wear
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Solution Overview
Problem
Current cutting apparatuses for manufacturing absorbent articles often cause unintended damage to elastic laminates and are prone to blade wear, leading to inconsistent cutting and increased maintenance costs.
Innovation Solution
The use of a laser source to impart a line of weakness in the absorbent article components, allowing for precise cutting and trim removal without excessive damage, and reducing the risk of blade wear by operating below the cutting power threshold to separate the substrate into a first and second portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a blade cutting apparatus is used to cut elastic laminates, then the elastic can be severed, but the substrate may be unintentionally damaged and the blade is susceptible to wear leading to inconsistent cutting
Solution Approach 1:
The patent replaces the mechanical blade cutting system with a laser-based cutting system. The laser source delivers energy to the material through optical focusing, eliminating mechanical contact between the cutting tool and the elastic laminate. This substitution resolves the blade wear issue while maintaining cutting precision, as the laser beam does not suffer from mechanical degradation.
Solution Approach 2:
The patent utilizes changes in laser power parameters to achieve different cutting outcomes. By adjusting the laser power below the cutting threshold, the system creates a line of weakness rather than a complete cut, allowing the material to separate cleanly without damaging the substrate. This parameter control enables consistent cutting performance without the reliability issues of mechanical blades.
2Manufacturing precision
If a blade cutting apparatus is used to trim substrates, then trim can be removed, but the trim may remain attached by uncut fibers and continue to advance with the substrate
Solution Approach 1:
The patent replaces mechanical blade trimming with laser-based trimming. The laser energy selectively作用于 the trim material and the bonding fibers, vaporizing or weakening them to enable complete separation. This eliminates the problem of uncut fibers that would otherwise remain attached and cause trimming defects.
Solution Approach 2:
The laser cutting process involves phase transitions of the material being cut. The laser energy heats the material to its melting or vaporization point, causing it to transition from solid to liquid or gas phase. This thermal phase change enables clean separation of the trim from the substrate without leaving uncut fibers, as the bonding material undergoes complete phase transformation.
3Productivity
If laser cutting power is increased to cut through material faster, then productivity improves, but excessive damage occurs to the substrate and edges become rough
Solution Approach 1:
The patent employs precise control of laser power parameters to optimize the cutting process. By maintaining laser power below the threshold that causes excessive melting or vaporization, the system achieves clean cuts with smooth edges. The parameter optimization allows sufficient cutting speed while preventing substrate damage and maintaining edge quality.
Solution Approach 2:
The patent applies partial action by using laser power that is sufficient to cut through the material but deliberately kept below the level that would cause excessive damage. This controlled partial energy application achieves the necessary cutting function while avoiding the harmful effects of excessive laser power, such as rough edges and substrate damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides consistent and precise cutting of substrates and elastics, minimizing damage and extending the lifespan of cutting devices, resulting in cost savings and improved product quality by creating a softer, smoother edge.
Implementation Method 1
advancing the belt assembly to a first laser source, where the first laser source imparts a line of weakness on the belt assembly
Implementation Method 2
the second laser source severs a portion of the one or more elastic strands forming a gap
Data Source
AI summary
The present disclosure relates to methods and apparatuses for assembling absorbent articles, and more particularly, methods and apparatuses for imparting a line of weakness into one or more layers of an advancing substrate. The advancing substrate may be a belt assembly including an outer layer, an inner layer, and one or more elastic strands disposed between the outer layer and the inner layer. The belt assembly may be rotated on a process member about a longitudinal axis of rotation. The process member may advance the belt assembly to a first laser source. The first laser source imparts a line of weakness into the belt assembly. A trim removal member may be used to separate the line of weakness forming a trim portion and a separation edge.